CN213740131U - Dynamic vibration absorber and clothes treatment device - Google Patents

Abstract

The utility model provides a dynamic vibration absorber and a clothes processing device. Wherein, the dynamic vibration absorber includes: a mounting seat; the electric strain component is connected with the mounting seat and used for straining under the action of a power supply so as to change the rigidity of the electric strain component; and the sliding block is connected with the electric strain component and can move relative to the mounting seat so as to stretch or compress the electric strain component. The electrostriction assembly has an electrostriction function, so that the rigidity of the electrostriction assembly can be changed under the action of the output voltage of the power supply, and the rigidity of the electrostriction assembly can change the natural frequency of the dynamic vibration absorber. The electric strain component is connected with a power supply with proper voltage according to the natural frequency of the to-be-absorbed piece, such as the natural frequency of a cylinder assembly in the washing machine, so that the natural frequency of the electric strain component is the same as or similar to the natural frequency of the cylinder assembly of the washing machine, the vibration amplitude of the to-be-absorbed piece near the natural frequency is effectively reduced, and the vibration absorption effect is improved.

Description

Dynamic vibration absorber and clothes treatment device

Technical Field

The utility model relates to a clothing treatment facility technical field particularly, relates to a dynamic vibration absorber and a clothing processing apparatus.

Background

At present, the cylinder assembly (including inner barrel, outer barrel, balance block, motor, etc.) of the drum washing machine is connected to the box body through a suspension spring and a shock absorber, and the cylinder assembly constitutes a vibration system. When the clothes in the inner barrel are not uniformly placed, a larger centrifugal force is generated in the rotating process of the inner barrel, so that the barrel assembly vibrates. Particularly, when the vibration system vibrates at a natural frequency or at a frequency close to the natural frequency, the amplitude is large, and the barrel part is likely to collide with the box body or the whole machine is likely to be displaced.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to at least one of the problems of the prior art or the related art.

Therefore, the utility model discloses a first aspect provides a dynamic vibration absorber.

A second aspect of the present invention provides a laundry treating apparatus.

In view of this, an embodiment of a first aspect of the present invention provides a dynamic vibration absorber, including: a mounting seat; the electric strain component is connected with the mounting seat and used for straining under the action of a power supply so as to change the rigidity of the electric strain component; and the sliding block is connected with the electric strain component and can move relative to the mounting seat so as to stretch or compress the electric strain component.

The dynamic vibration absorber provided by the embodiment comprises a mounting seat, a sliding block and an electrostrictive assembly. Specifically, the slider is connected with the mounting base through the electrostrictive assembly, and the slider can stretch or press the electrostrictive assembly to move relative to the mounting base, namely the electrostrictive assembly has certain elasticity and can be stretched or compressed by the slider. Therefore, when the dynamic vibration absorber is arranged on the clothes treatment device, for example, the dynamic vibration absorber is arranged on the outer barrel of the washing machine, under the impact caused by the rotation of the inner barrel of the washing machine, the sliding block of the dynamic vibration absorber can move relative to the mounting seat, the energy is consumed by stretching or compressing the electrostrictive component, the vibration amplitude of the washing machine is favorably reduced, and the vibration reduction effect is good.

Moreover, the electrostrictive component has an electrostrictive function, so that the rigidity of the electrostrictive component can be changed under the action of the output voltage of the power supply, and the rigidity of the electrostrictive component can change the natural frequency of the dynamic vibration absorber. Therefore, by connecting power supplies with different voltages to the electrostrictive element, the electrostrictive element can have different natural frequencies and different vibration absorption effects. Since the closer the natural frequency of the dynamic-vibration absorber is to the natural frequency of the member to be absorbed, the better the dynamic-vibration absorber reduces the amplitude of vibration of the member to be absorbed in the vicinity of the natural frequency. The electric strain component is connected with a power supply with proper voltage according to the natural frequency of the to-be-absorbed piece, such as the natural frequency of a cylinder assembly in the washing machine, so that the natural frequency of the electric strain component is the same as or similar to the natural frequency of the cylinder assembly of the washing machine, the vibration amplitude of the to-be-absorbed piece near the natural frequency is effectively reduced, and the vibration absorption effect is improved.

In addition, the electrostrictive assembly can have different natural frequencies, and parts of the electrostrictive assembly do not need to be changed or replaced, so that the universality of the electrostrictive assembly is greatly improved.

Additionally, according to the utility model discloses the dynamic vibration absorber that above-mentioned technical scheme provided still has following additional technical characteristics:

in one possible design, an electrostrictive element includes: the first metal layer is provided with an opening and is used for being electrically connected with a positive electrode of a power supply; a second metal layer for electrical connection with a negative electrode of a power supply; and the strainable layer is positioned between the first metal layer and the second metal layer and is used for straining into the opening under the action of a power supply so as to increase the rigidity of the electrostrictive component.

In this design, the structure of the electrostrictive element is specifically defined. The electrostrictive assembly includes a first metal layer, a second metal layer, and a strainable layer. The strain-variable layer is arranged between the first metal layer and the second metal layer, the first metal layer and the second metal layer are electrified, the first metal layer is specifically connected with the anode of a power supply, the second metal layer is connected with the cathode of the power supply, the strain-variable layer can be strained under the action of the output voltage of the power supply and enters the opening of the first metal layer, and therefore the rigidity of the electric strain assembly can be increased. Wherein the strainable layer has elasticity such that the electrostrictive assembly as a whole is capable of stretching and compressing.

In one possible design, the stiffness of the electrostrictive member is positively correlated with the magnitude of the output voltage of the power source.

In the design, the rigidity of the electrostriction assembly is in direct proportion to the output voltage of the power supply, so that the output voltage of the power supply can be accurately adjusted, the rigidity of the electrostriction assembly can be accurately adjusted, and the natural frequency of the dynamic vibration absorber can be accurately adjusted.

In one possible design, the first metal layer comprises a metal mesh; the second metal layer comprises a metal foil; the strainable layer comprises a PVC gel layer.

In the design, the first metal layer is made to comprise a metal net, such as a fine metal net, and the second metal layer is made of metal foil, so that the structure is simple, the cost is saved, the electric conductivity is good, and the damage is not easy to damage. And by including a PVC (Polyvinyl chloride) gel layer in the strainable layer, for example, a PVC gel film is formed. On one hand, the PVC gel has better elasticity and is easier to be stretched or compressed by the sliding block; on the other hand, the PVC gel has a simple structure and low cost, and the response speed of the rigidity of the PVC gel changing along with the voltage change is very high and is less than 10ms, so that the electrostrictive assembly can be used as an excellent rigidity-adjustable spring.

In one possible design, the number of the strainable layers is multiple, and the multiple strainable layers are stacked and distributed at intervals.

In the design, the number of the strainable layers is multiple, and the strainable layers are distributed in a stacking mode. The structural strength and the rigidity of the electrostriction assembly are guaranteed, the elasticity maintenance performance of the electrostriction assembly is improved, and the electrostriction assembly is prevented from being easily broken. When the number of the strainable layers is multiple, the number of the first metal layers and the number of the second metal layers are also multiple, and one first metal layer and one second metal layer adjacent to the first metal layer are still distributed on two sides of one strainable layer.

In one possible design, there is a first metal layer between any one of the strainable layers and an adjacent one of the strainable layers and a second metal layer between the adjacent other one of the strainable layers.

In this design, when a plurality of first metal layers, a plurality of second metal layers, and a plurality of strainable layers are stacked together, one first metal layer is shared between two adjacent strainable layers, or one second metal layer is shared, which is advantageous for saving materials and costs. Furthermore, it is advantageous to reduce the effect on the elasticity of the strainable layer so that the electrostrictive element can be stretched or compressed during movement of the slider.

In one possible design, the number of electrostrictive elements is two, distributed on opposite sides of the slider.

In this design, the dynamic vibration absorber includes two electrostrictive components, the two electrostrictive components are distributed on two sides of the sliding block, and the end parts of the two electrostrictive components far away from the sliding block are connected with the mounting seat. The electric strain component on one side is stretched and the electric strain component on the other side is compressed in the moving process of the sliding block. The vibration energy of the clothes processing device is consumed through the two electrostriction assemblies and the sliding block, and the vibration reduction effect of the dynamic vibration absorber is improved.

In one possible design, the dynamic vibration absorber further includes: and the power supply is electrically connected with the electrostrictive component. Further, the output voltage of the power supply is adjustable.

In this design, the dynamic vibration absorber further comprises a power supply, and the power supply supplies power to the electrostrictive element, so that the electrostrictive element achieves proper rigidity. The change of the rigidity of the electrostrictive strain component can bring the change of the fixed frequency of the dynamic vibration absorber, which is beneficial to designing the output voltage of a power supply, so that the fixed frequency of the dynamic vibration absorber is adapted to the fixed frequency of the piece to be vibrated, thereby effectively reducing the vibration amplitude of the piece to be vibrated near the natural frequency and improving the vibration reduction effect.

In addition, by making the output voltage of the power supply adjustable, since the stiffness of the electrostrictive member can be changed with the change of the output voltage of the power supply, the stiffness of the electrostrictive member can be adjusted by adjusting the output voltage of the power supply. On one hand, the fixed frequency of the electrostriction assembly is suitable for a plurality of pieces to be absorbed with different fixed frequencies, and only the output voltage of the power supply needs to be correspondingly adjusted, so that the universality of the electrostriction assembly is improved. On the other hand, the method is favorable for adjusting the fixed frequency of the electrostrictive strain component at any time, and particularly under the condition that the vibration amplitude of the to-be-absorbed vibration piece is constantly changed, the method is favorable for adjusting the fixed frequency of the electrostrictive strain component at any time according to the vibration frequency of the to-be-absorbed vibration piece. For example, when the rotation speed of the inner tub of the washing machine is reduced, and when the inner tub of the washing machine is rotated at a high speed, the output voltage of the power supply is adjusted to provide different suitable voltages to the electro-strain element. The natural frequency of the electrostriction assembly is always equal to or close to the frequency of the exciting force caused by the rotation of the inner barrel. Therefore, no matter in the washing stage, the dewatering stage and the like, the dynamic vibration absorber can achieve good vibration absorbing effect, the vibration amplitude of the clothes processing device can be further reduced, and the vibration absorbing effect is improved.

In one possible design, the dynamic vibration absorber further includes: and the controller is electrically connected with the power supply and is used for controlling the output voltage of the power supply according to the operation parameters of the piece to be absorbed.

In the design, the dynamic vibration absorber further comprises a controller, and particularly, the controller can control the output voltage of the power supply according to the operating parameters of the piece to be vibrated, so that the natural frequency of the electrostrictive component is always equal to or close to the vibration frequency of the piece to be vibrated. For example, the natural frequency of the electrostrictive component is always equal to the frequency of the exciting force caused by the rotation of the inner barrel of the clothes processing device, so that the dynamic vibration absorber can achieve good vibration absorbing effect no matter in a washing stage, a dewatering stage and the like, the vibration amplitude of the clothes processing device can be effectively reduced, and the vibration absorbing effect is improved.

In one possible design, the controller is configured to determine a target stiffness of the electrostrictive element based on the received rotational speed of the member to be damped; and controlling the output voltage of the power supply according to the target rigidity and the corresponding relation between the prestored rigidity and the voltage of the electrostrictive component.

In this design, the controller is specifically enabled to determine the target stiffness k of the electrostrictive element in accordance with the received rotation speed of the member to be absorbed. Specifically, the mass of the sliding block is set as m, the target rigidity k of the electrostrictive strain component required by the rotating speed w of the inner barrel is deduced according to a calculation formula of the inherent frequency of the single degree of freedom system, and the calculation formula of the inherent frequency of the single degree of freedom system is as follows:

after the target rigidity k is obtained, the voltage required to be output by the power supply can be determined according to the corresponding relation between the rigidity of the pre-stored electrostrictive assembly and the required voltage, so that the power supply is controlled to output according to the corresponding voltage, the rigidity of the electrostrictive assembly reaches the target rigidity, and the natural frequency of the electrostrictive assembly is always equal to or close to the frequency of the exciting force caused by the rotation of the inner barrel. Specifically, the material composition of the electrostrictive element and the structural dimensions, such as the area and the thickness, of the electrostrictive element can be adjusted to obtain a suitable structure of the electrostrictive element, and the relationship between the rigidity k and the voltage v, which is abbreviated as k ═ f (v), or v ═ g (k), can be obtained by testing the rigidity of the electrostrictive element at different voltages. f and g are inverse functions of each other, and the corresponding relation between the rigidity k and the voltage v is prestored in the controller. And the target rigidity k calculated according to the natural frequency calculation formula of the single-degree-of-freedom system is pushed to a voltage v from v ═ g (k), wherein the voltage v is the voltage which is required to be applied to the electrostrictive component for the rotating speed w of the inner barrel. Because the exciting force caused by the rotation of the inner barrel is in direct proportion to the square of the rotating speed, the natural frequency of the electrostriction assembly can be always equal to or close to the frequency of the exciting force caused by the rotation of the inner barrel, and the vibration reduction effect of the dynamic vibration absorber is improved.

An embodiment of a second aspect of the present invention provides a clothes treatment apparatus, including: the dynamic vibration absorber according to any one of the above-described embodiments.

The utility model provides a clothing processing apparatus owing to have the dynamic vibration absorber of above-mentioned arbitrary technical scheme, and then has the beneficial effect of above-mentioned arbitrary technical scheme, differs a perplexing here.

Further, the laundry treating apparatus further includes an inner tub and an outer tub; the inner barrel is arranged inside the outer barrel and can rotate in the outer barrel; the dynamic vibration absorber is used as a balance block and is arranged on the outer barrel.

In one possible design, the laundry treating apparatus further includes: and the rotating speed detection device is electrically connected with the controller of the dynamic vibration absorber and is used for detecting the rotating speed of the inner barrel.

In this embodiment, the laundry processing apparatus further includes a rotation speed detecting device, the rotation speed detecting device detects the rotation speed of the inner tub, and transmits the rotation speed information of the inner tub to the controller through the signal transmission line, or wirelessly transmits the rotation speed information of the inner tub to the controller, so that the controller can receive the rotation speed of the inner tub in time, and finally confirm the magnitude of the voltage applied to the electrical induced strain assembly by the power source according to the rotation speed of the inner tub, thereby controlling the power source to apply the voltage corresponding to the rotation speed of the inner tub.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

Fig. 1 shows a schematic configuration diagram of a related art dynamic vibration absorber;

fig. 2 shows a schematic structural diagram of a dynamic vibration absorber according to an embodiment of the present invention;

fig. 3 shows a schematic structural view of an electrostrictive element according to an embodiment of the present invention;

FIG. 4 is a graph illustrating a variation of vibration amplitude of an inner tub of a laundry treating apparatus according to a related art with a variation of a rotation speed of the inner tub;

fig. 5 shows a graph comparing vibration amplitude of an inner tub of a related art laundry treating device with vibration amplitude of an inner tub of a laundry treating device of the present application.

Wherein, the corresponding relationship between the reference numbers and the component names in fig. 1 is:

100 'mounting seat, 200' spring, 300 'sliding block, 900' sliding rail;

the correspondence between reference numerals and part names in fig. 2 and 3 is:

100 mount, 200 electro-strain component, 210 first metal layer, 220 second metal layer, 230 strainable layer, 300 slider, 400 power supply, 500 controller, 600 first signal transmission line, 700 second signal transmission line, 800 wire.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings, which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

The dynamic vibration absorber of some embodiments of the present invention is described below with reference to fig. 2 and 3.

As shown in fig. 2, an embodiment of the first aspect of the present invention provides a dynamic vibration absorber, including: amount 100, anelectrostrictive assembly 200 and aslider 300. Theslider 300 is connected to themount 100 through the electro-strain assembly 200. Wherein theelectrostrictive assembly 200 is capable of being strained by thepower source 400 to change the stiffness of theelectrostrictive assembly 200; theslider 300 is capable of stretching or compressing theelectrostrictive assembly 200 to move relative to themount 100.

The dynamic vibration absorber proposed in the present embodiment includes amount 100, aslider 300, and anelectrostrictive element 200. Specifically, theslider 300 is connected to the mountingbase 100 through theelectrical strain element 200, and theslider 300 can stretch or press theelectrical strain element 200 to move relative to the mountingbase 100, i.e. theelectrical strain element 200 has a certain elasticity and can be stretched or compressed by theslider 300. Therefore, when the dynamic vibration absorber is installed on the clothes treatment device, for example, on the outer tub of the washing machine, under the impact caused by the rotation of the inner tub of the washing machine, theslider 300 of the dynamic vibration absorber can move relative to theinstallation base 100, and the energy is consumed by stretching or compressing theelectrostrictive element 200, which is beneficial to reducing the vibration amplitude of the washing machine, and the vibration reduction effect is good.

Moreover, since theelectrostrictive element 200 has the electrostrictive function, the rigidity thereof can be changed by the output voltage of thepower supply 400, and the rigidity of theelectrostrictive element 200 can change the natural frequency of the dynamic vibration absorber. Therefore, by connecting thepower sources 400 with different voltages to theelectrical strain element 200, theelectrical strain element 200 can have different natural frequencies and different vibration absorption effects. Since the closer the natural frequency of the dynamic-vibration absorber is to the natural frequency of the member to be absorbed, the better the dynamic-vibration absorber reduces the amplitude of vibration of the member to be absorbed in the vicinity of the natural frequency. Thepower supply 400 which is beneficial to connecting proper voltage to theelectrostrictive assembly 200 according to the natural frequency of the piece to be absorbed, for example, the natural frequency of the cylinder assembly in the washing machine, so that the natural frequency of theelectrostrictive assembly 200 is the same as or similar to the natural frequency of the cylinder assembly of the washing machine, thereby effectively reducing the vibration amplitude of the piece to be absorbed near the natural frequency and improving the vibration reduction effect.

When the vibration frequency of the dynamic vibration absorber to the member to be vibrated is not near the natural frequency, that is, the vibration frequency of the member to be vibrated is not equal to or close to the natural frequency, thepower supply 400 can supply different suitable voltages to theelectrostrictive element 200 in the case where thepower supply 400 can supply different voltages to theelectrostrictive element 200 according to the vibration amplitude of the drum unit of the washing machine, for example, when the rotation speed of the inner tub of the washing machine is reduced, and when the inner tub of the washing machine is rotated at a high speed. It is advantageous to have the natural frequency of theelectrostrictive assembly 200 always equal to or close to the frequency of the exciting force caused by the rotation of the inner barrel. Therefore, no matter in the washing stage, the dewatering stage and the like, the dynamic vibration absorber can achieve good vibration absorbing effect, the vibration amplitude of the clothes processing device can be further reduced, and the vibration absorbing effect is improved.

Of course, thepower source 400 with different pressure levels can be provided to theelectrostrictive element 200 of the dynamic vibration absorber according to different requirements, so that the fixed frequency of the dynamic vibration absorber does not need to be adapted to the vibration frequency of the member to be absorbed.

In the related art, in order to reduce the vibration of the cylinder portion around the natural frequency, it is common to add a dynamic vibration absorber to the cylinder portion. As shown in fig. 1, the upper balance weight of the drum washing machine is designed as a dynamic vibration absorber including a spring 200 ', a slider 300', a mounting seat 100 'and a slide rail 900', and the natural frequency of the dynamic vibration absorber is set to be approximately equal to the natural frequency of a vibration system of a drum assembly of the laundry treating apparatus, thereby effectively reducing the vibration of the drum assembly in the vicinity of the natural frequency.

However, when the dynamic vibration absorber of the related art does not vibrate near the natural frequency with respect to the member to be vibrated, that is, the vibration frequency of the member to be vibrated is not equal to or close to the natural frequency, the vibration reduction effect of the dynamic vibration absorber of the related art is extremely poor. The dynamic vibration absorber in the related art must generate two new vibration peaks while reducing the vibration of the vibration system in the vicinity of the natural frequency. And since the exciting force of the vibration system is proportional to the square of the rotation speed, the second vibration peak value is generally higher, and under the condition that some damping settings are not reasonable, the peak value can be even higher than the vibration peak value of the unpowered vibration absorber. In this way, in the low-speed dewatering stage, after the dynamic vibration absorber is used, the maximum amplitude of the cylindrical part is reduced to a small extent, and even the maximum amplitude is deteriorated, so that the cylindrical part cannot prevent the cylindrical part from colliding with the box body. As can be seen from fig. 4, the vibration amplitude of the inner tub of the laundry treating apparatus to which the related art dynamic vibration absorber is applied is greater than the vibration amplitude relying on only the original weight when the rotation speed of the inner tub is between 100rpm and 200 rpm; when the rotating speed of the inner barrel is above 270rpm, the vibration amplitude of the inner barrel is more severe, and is far larger than the vibration amplitude only depending on the original balance block. In the high-speed dewatering stage, the excitation force of the inner tub has a frequency far higher than the natural frequency of the dynamic vibration absorber in the related art, so that the dynamic vibration absorber in the related art does not play any role.

With the dynamic vibration absorbing module of the present embodiment, in case that thepower supply 400 can supply voltages of different magnitudes to theelectrostrictive element 200 according to the vibration amplitude of the drum assembly of the washing machine, the natural frequency of theelectrostrictive element 200 can be always equal to or close to the frequency of the exciting force caused by the rotation of the inner tub. As can be seen from fig. 5, the vibration amplitude of the inner tub is still significantly reduced with the increase of the rotation speed of the inner tub, and the vibration reduction effect is good, compared with the dynamic vibration absorption module adopting the related art and the balance block adopting the related art.

Moreover, the versatility of theelectrical strain assembly 200 is greatly improved, since theelectrical strain assembly 200 can have different natural frequencies without changing or replacing the components of theelectrical strain assembly 200.

It should be noted that the dynamic vibration absorber of the present application can be used in a clothes treatment apparatus, such as a washing machine, a dryer, etc., and can also be used in other apparatuses, all of which fall within the scope of the present application.

In some embodiments, as shown in fig. 3, theelectrostrictive assembly 200 includes afirst metal layer 210, asecond metal layer 220, and astrainable layer 230. Thestrainable layer 230 is disposed between thefirst metal layer 210 and thesecond metal layer 220, and thefirst metal layer 210 and thesecond metal layer 220 are electrically connected, specifically, thefirst metal layer 210 is connected to the positive electrode of thepower source 400, and thesecond metal layer 220 is connected to the negative electrode of thepower source 400, so that thestrainable layer 230 can be strained under the action of the output voltage of thepower source 400 and enter the opening of thefirst metal layer 210, thereby increasing the rigidity of theelectrostrictive assembly 200. Wherein thestrainable layer 230 has elasticity such that theelectrostrictive assembly 200 is capable of stretching and compressing as a whole.

Further, the number of the openings is plural, and the openings are distributed on thefirst metal layer 210 at equal intervals. Facilitating more entry into the opening after thestrainable layer 230 is strained, thereby altering the stiffness of theelectrostrictive assembly 200 to a greater extent.

In some embodiments, making the stiffness of the electricalstrain generating assembly 200 directly proportional to the output voltage of thepower supply 400 facilitates accurate adjustment of the output voltage of thepower supply 400, thereby accurately adjusting the stiffness of the electricalstrain generating assembly 200 and accurately adjusting the natural frequency of the dynamic vibration absorber.

In some embodiments, thefirst metal layer 210 includes a metal mesh, such as a fine metal mesh, and thesecond metal layer 220 is a metal foil, which is simple in structure, cost-effective, good in conductivity, and not easy to damage. And by including a PVC (Polyvinyl chloride) gel layer in thestrainable layer 230, for example, a PVC gel film is formed. On one hand, the PVC gel has better elasticity and is easier to be stretched or compressed by the slidingblock 300; on the other hand, the PVC gel has a simple structure and low cost, and the response speed of the PVC gel with the stiffness changing along with the voltage change is very fast (less than 10ms), so that theelectrostrictive assembly 200 can be used as an excellent spring with adjustable stiffness.

Of course, thefirst metal layer 210 may have other structures with openings. Thesecond metal layer 220 may also be other electrode parts. Such as a metal foil. Similarly, thestrainable layer 230 may be made of other materials, and is not limited to PVC gel.

In some embodiments, the number of thestrainable layers 230 is made to be plural, and the layers are stacked and distributed. The structural strength and the rigidity of theelectrostrictive strain assembly 200 are favorably ensured, the elasticity maintenance of theelectrostrictive strain assembly 200 is improved, and theelectrostrictive strain assembly 200 is prevented from being easily broken. When the number of thestrainable layers 230 is plural, the number of thefirst metal layers 210 and the number of thesecond metal layers 220 are also plural, and onefirst metal layer 210 and onesecond metal layer 220 adjacent to the first metal layer are still distributed on two sides of onestrainable layer 230.

In a specific embodiment, as shown in fig. 3, in the case that a plurality offirst metal layers 210, a plurality of second metal layers 220, and a plurality ofstrainable layers 230 are stacked together, onefirst metal layer 210 or onesecond metal layer 220 is shared between two adjacentstrainable layers 230, which is beneficial to saving materials and saving costs. Also, it is advantageous to reduce the impact on the elasticity of thestrainable layer 230 so that theelectrostrictive assembly 200 can be stretched or compressed during movement of theslider 300.

Of course, in another specific embodiment, a separatefirst metal layer 210 andsecond metal layer 220 may be provided for each of the strainable layers 230. For example, twofirst metal layers 210 or twosecond metal layers 220 or onefirst metal layer 210 and onesecond metal layer 220 are between two adjacent strainable layers 230.

In some embodiments, the dynamic vibration absorber includes twoelectrostrictive members 200, the twoelectrostrictive members 200 are distributed on both sides of theslider 300, and the end portions of the twoelectrostrictive members 200 remote from theslider 300 are connected to themount 100. It is advantageous for theslider 300 to stretch theelectrostrictive element 200 on one side and compress theelectrostrictive element 200 on the other side during movement. The vibration energy of the laundry treating apparatus is consumed by the two electro-strain modules 200 and theslider 300, and the vibration damping effect of the dynamic vibration absorber is improved.

In some embodiments, the dynamic vibration absorber further comprises apower source 400, and theelectrostrictive element 200 is electrically connected to thepower source 400.

In this embodiment, the dynamic vibration absorber further includes apower supply 400, and theelectrical strain element 200 is supplied with power through thepower supply 400 to achieve a suitable stiffness of theelectrical strain element 200. Because the change of the rigidity of theelectrostrictive strain component 200 can bring about the change of the fixed frequency of the dynamic vibration absorber, the design of the output voltage of thepower supply 400 is facilitated, and the fixed frequency of the dynamic vibration absorber is adapted to the fixed frequency of the to-be-absorbed vibration piece, so that the vibration amplitude of the to-be-absorbed vibration piece near the natural frequency is effectively reduced, and the vibration reduction effect is improved.

Further, the output voltage of thepower supply 400 is made adjustable. Since the stiffness of theelectrostrictive assembly 200 can be varied with a variation in the output voltage of thepower supply 400, the stiffness of theelectrostrictive assembly 200 can be adjusted by adjusting the output voltage of thepower supply 400. On one hand, the fixed frequency of theelectrostrictive strain assembly 200 is suitable for a plurality of pieces to be absorbed with different fixed frequencies, and the universality of theelectrostrictive strain assembly 200 is improved only by correspondingly adjusting the output voltage of thepower supply 400. On the other hand, the fixed frequency of theelectrostrictive strain assembly 200 can be adjusted at any time, and especially, the fixed frequency of theelectrostrictive strain assembly 200 can be adjusted at any time according to the vibration frequency of the to-be-absorbed member under the condition that the vibration amplitude of the to-be-absorbed member is changed constantly. For example, when the rotation speed of the inner tub of the washing machine is reduced, and when the inner tub of the washing machine is rotated at a high speed, the output voltage of thepower supply 400 is adjusted to provide different suitable voltages to theelectrostrictive member 200. It is advantageous to have the natural frequency of theelectrostrictive assembly 200 always equal to or close to the frequency of the exciting force caused by the rotation of the inner barrel. Therefore, no matter in the washing stage, the dewatering stage and the like, the dynamic vibration absorber can achieve good vibration absorbing effect, the vibration amplitude of the clothes processing device can be further reduced, and the vibration absorbing effect is improved.

In a particular application, thepower supply 400 is a dc power supply.

As to how the output voltage of thepower supply 400 changes, and depending on what. The vibration amplitude ranges of the inner tub of the laundry treating apparatus in different rotation speed ranges may be detected in advance, and the target fixed frequency of theelectrical strain assembly 200 is designed corresponding to the different vibration amplitude ranges, so as to determine the magnitude of the voltage required to be supplied to theelectrical strain assembly 200. In the operation of the laundry treating apparatus, thepower supply 400 is directly sequentially outputted according to different voltages to correspond to different ranges of the rotation speed and different ranges of the vibration amplitude of the inner tub. Or the rotating speed of the inner barrel can be detected in real time, the target voltage of theelectrostrictive assembly 200 can be calculated in real time according to the rotating speed, thepower supply 400 can output the voltage required by theelectrostrictive assembly 200 in real time, and therefore the natural frequency of theelectrostrictive assembly 200 is always equal to or close to the frequency of the exciting force caused by the rotation of the inner barrel. The output voltage of thepower supply 400 may be controlled in a variety of ways to adjust the stiffness of theelectrostrictive assembly 200.

In some embodiments, the dynamic vibration absorber further comprises acontroller 500, in particular, thecontroller 500 is enabled to control the output voltage of thepower supply 400 in dependence on the operating parameters of the member to be absorbed. It is advantageous to have the natural frequency of theelectrostrictive assembly 200 always equal to or close to the vibration frequency of the member to be vibrated. For example, the natural frequency of theelectrostrictive element 200 is always equal to the frequency of the exciting force caused by the rotation of the inner tub of the laundry treatment apparatus, so that the dynamic vibration absorber can achieve a good vibration absorbing effect no matter in the washing stage or the dewatering stage, and the like, the vibration amplitude of the laundry treatment apparatus can be effectively reduced, and the vibration absorbing effect is improved.

In one particular embodiment, thecontroller 500 is capable of determining a target stiffness of theelectrostrictive assembly 200 based on the received rotational speed of the member to be absorbed; and controls the magnitude of the output voltage of thepower supply 400 according to the target stiffness and the corresponding relationship between the pre-stored voltage and the stiffness of theelectrostrictive element 200.

In this embodiment, thecontroller 500 is specifically enabled to determine the target stiffness k of theelectrostrictive assembly 200 based on the received rotational speed of the member to be absorbed. Specifically, assuming that the mass of theslider 300 is m, the target stiffness k of theelectrostrictive strain assembly 200 required for the rotation speed w of the inner barrel is derived according to a single degree of freedom system natural frequency calculation formula:

after the target stiffness k is obtained, the voltage required to be output by thepower supply 400 can be determined according to the corresponding relation between the pre-stored stiffness of theelectrostrictive assembly 200 and the required voltage, so that thepower supply 400 is controlled to output according to the corresponding voltage, the stiffness of theelectrostrictive assembly 200 reaches the target stiffness, and the natural frequency of theelectrostrictive assembly 200 is always equal to or close to the frequency of the exciting force caused by the rotation of the inner barrel. Specifically, the material composition of theelectrical strain device 200 and the structural dimensions, such as the area and the thickness, of theelectrical strain device 200 may be adjusted to obtain a suitable structure of theelectrical strain device 200, and the relationship between the stiffness k and the voltage v, which is abbreviated as k ═ f (v), or v ═ g (k), is obtained by testing the stiffness of theelectrical strain device 200 at different voltages. f and g are inverse functions of each other, and the corresponding relationship between the stiffness k and the voltage v is prestored in thecontroller 500. And the target rigidity k calculated according to the natural frequency calculation formula of the single-degree-of-freedom system is pushed to a voltage v by v ═ g (k), wherein the voltage v is the voltage which is required to be applied to theelectrostrictive element 200 for the rotating speed w of the inner barrel. Because the exciting force caused by the rotation of the inner barrel is in direct proportion to the square of the rotating speed, the natural frequency of theelectrostrictive assembly 200 can be always equal to or close to the frequency of the exciting force caused by the rotation of the inner barrel, and the vibration reduction effect of the dynamic vibration absorber is improved.

Specifically, the main control board of the laundry processing device collects the rotation speed w (t) of the inner tub through the rotation speed detection device in real time, and transmits the rotation speed w (t) to thecontroller 500, for example, a control chip, thecontroller 500 sends out a voltage command according to the above algorithm, and transmits the voltage command to thepower supply 400 through the signal transmission line, and thepower supply 400 further outputs a suitable voltage, so that theelectrical strain assembly 200 generates a suitable rigidity. Therefore, in the whole dehydration stage, the natural frequency of the dynamic vibration absorber is always equal to the frequency of the exciting force caused by the rotation of the inner barrel, and the effect that the dynamic vibration absorber can play a role in the whole dehydration stage is achieved.

As shown in fig. 2, the dynamic vibration absorber according to an embodiment of the present invention will be described in detail below. Including a tray (one type of mount 100), a PVC gel laminate (one type of electrostrictive member 200), aslider 300, awire 800, a voltage-variable direct current power source (one type of power source 400), a firstsignal transmission line 600, a control chip (one type of controller 500), and a secondsignal transmission line 700. Specifically, thepower source 400 is connected to the control chip through a firstsignal transmission line 600, the control chip is connected to a main control board of a washing machine (a kind of laundry treating apparatus) through a secondsignal transmission line 700, and the PVC gel laminate is connected to thepower source 400 through awire 800. In contrast to the related-art dynamic vibration absorber shown in fig. 1, the present embodiment uses a PVC gel laminate as the upper weight, and uses the PVC gel laminate instead of the spring in fig. 1. The PVC gel laminate is a laminate structure in which a plurality of units each composed of a fine metal mesh (one of thefirst metal layers 210, electrically connected to the positive electrode of the power supply 400), a conductive material such as a metal foil (electrically connected to the negative electrode of the power supply 400), and a PVC gel film (one of the PVC gel layers) sandwiched therebetween are stacked together. When the unit is electrified, the PVC film is deformed under the action of electrostriction, enters the fine metal mesh and increases the rigidity of the whole unit. Thus, the overall stiffness of the PVC gel laminate is positively correlated with the strength of the electric field to which each cell is subjected. The PVC gel lamination is simple in structure and low in cost, and the response speed of the rigidity changing along with the voltage change is very fast and is less than 10ms, so that the PVC gel lamination can be used as an excellent rigidity variable spring.

Based on the principle, the balance weight dynamic vibration absorber using the PVC gel lamination as the spring is designed. The structure is shown in fig. 3.

At the beginning of design, the material composition of theelectrostrictive element 200 and the structural dimensions, such as the area and the thickness, of theelectrostrictive element 200 are adjusted to obtain a suitable structure of theelectrostrictive element 200, and the relationship between the stiffness k and the voltage v, which is abbreviated as k ═ f (v), or v ═ g (k), is obtained by testing the stiffness of theelectrostrictive element 200 at different voltages. f and g are inverse functions of each other.

Assuming that the mass of theslider 300 is m, the target stiffness k of theelectrostrictive strain assembly 200 required corresponding to the inner barrel rotation speed w is deduced according to a single degree of freedom system natural frequency calculation formula:

and the target rigidity k calculated according to the natural frequency calculation formula of the single-degree-of-freedom system is pushed to a voltage v by v ═ g (k), wherein the voltage v is the voltage which is required to be applied to theelectrostrictive element 200 for the rotating speed w of the inner barrel.

After the dynamic vibration absorber of the PVC gel laminate as shown in fig. 3 is mounted on the washing machine, after the washing machine enters a dehydration procedure, the main control board of the washing machine collects the rotation speed w (t) of the inner tub in real time and transmits the rotation speed w (t) to the control chip through the secondsignal transmission line 700, the control chip sends a voltage instruction according to the above algorithm and transmits the voltage instruction to thepower supply 400 through the firstsignal transmission line 600, and thepower supply 400 further outputs a proper voltage, so that the PVC gel laminate generates a proper rigidity. Therefore, in the whole dehydration stage, the natural frequency of the dynamic vibration absorber is always equal to the frequency of the exciting force, and the effect that the dynamic vibration absorber can play a role in the whole dehydration stage is achieved.

An embodiment of a second aspect of the present invention provides a clothes treatment apparatus, including: the dynamic vibration absorber according to any one of the above embodiments. The utility model provides a clothes treatment device owing to have the dynamic vibration absorber of above-mentioned arbitrary embodiment, and then has the beneficial effect of above-mentioned arbitrary embodiment, differs a perk here.

Further, the laundry treating apparatus further includes an inner tub and an outer tub; the inner barrel is arranged inside the outer barrel and can rotate in the outer barrel; the dynamic vibration absorber is used as a balance block and is arranged on the outer barrel.

In some embodiments, the laundry treating apparatus further includes a rotation speed detecting device, which detects the rotation speed of the inner tub through the rotation speed detecting device and transmits the rotation speed information of the inner tub to thecontroller 500 through the signal transmission line, or wirelessly transmits the rotation speed information of the inner tub to thecontroller 500, so that thecontroller 500 receives the rotation speed of the inner tub in time, and finally determines the magnitude of the voltage that thepower supply 400 needs to apply to the electricalstrain generating assembly 200 according to the rotation speed of the inner tub, thereby controlling thepower supply 400 to apply the voltage corresponding to the rotation speed of the inner tub.

In the present application, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A dynamic vibration absorber, characterized by comprising:

a mounting base (100);

an electro-strain assembly (200) connected to the mount (100), the electro-strain assembly (200) being adapted to be strained by a power source (400) to change the stiffness of the electro-strain assembly (200);

a slider (300) connected to the electrostrictive assembly (200), the slider (300) being movable relative to the mount (100) to stretch or compress the electrostrictive assembly (200).

2. The dynamic vibration absorber of claim 1,

the electrostrictive assembly (200) includes:

a first metal layer (210), the first metal layer (210) being provided with an opening, the first metal layer (210) being for electrical connection with a positive pole of the power supply (400);

a second metal layer (220), the second metal layer (220) for electrical connection with a negative pole of the power supply (400);

a strainable layer (230) between the first metal layer (210) and the second metal layer (220), the strainable layer (230) for straining into the opening under the action of the power source (400) to increase the stiffness of the electrostrictive assembly (200).

3. The dynamic vibration absorber of claim 2,

the stiffness of the electrostrictive member (200) is positively correlated with the magnitude of the output voltage of the power source (400).

4. The dynamic vibration absorber according to claim 2 or 3,

the first metal layer (210) comprises a metal mesh;

the second metal layer (220) comprises a metal foil;

the strainable layer (230) comprises a layer of PVC gel.

5. The dynamic vibration absorber according to claim 2 or 3,

the number of the strainable layers (230) is multiple, and the strainable layers (230) are stacked and distributed at intervals;

any one of the strainable layers (230) has one of the first metal layers (210) between adjacent ones of the strainable layers (230) and one of the second metal layers (220) between adjacent ones of the strainable layers (230).

6. The dynamic vibration absorber according to any one of claims 1 to 3,

the number of the electrostrictive elements (200) is two, and the electrostrictive elements are distributed on two opposite sides of the slider (300).

7. The dynamic vibration absorber according to any one of claims 1 to 3, further comprising:

the power supply (400) is electrically connected with the electrostrictive component (200), and the output voltage of the power supply (400) is adjustable.

8. The dynamic-vibration absorber according to claim 7, further comprising:

the controller (500) is electrically connected with the power supply (400), and the controller (500) is used for controlling the output voltage of the power supply (400) according to the operating parameters of the piece to be absorbed.

9. The dynamic vibration absorber of claim 8,

the controller (500) is used for determining the target rigidity of the electric strain assembly (200) according to the received rotating speed of the piece to be absorbed; and

and controlling the output voltage of the power supply (400) according to the target rigidity and the corresponding relation between the prestored rigidity and the voltage of the electrostrictive assembly (200).

10. A laundry treating apparatus, comprising:

an outer tub;

an inner tub disposed in the outer tub and rotatable with respect to the outer tub; and

the dynamic-vibration absorber according to any one of claims 1 to 9, wherein said dynamic-vibration absorber is mounted to said outer tub as a weight.

11. The laundry treating apparatus according to claim 10, further comprising:

and the rotating speed detection device is electrically connected with a controller (500) of the dynamic vibration absorber and is used for detecting the rotating speed of the inner barrel.

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