Background
In various fields such as daily life, industrial production, transportation, military equipment and the like, air is often required to be filtered, so that clean air for removing various impurities such as sand grains, dust, chips and the like is obtained. In daily life, clean air can improve the environment of people and improve the quality of life. In industrial production, clean air can be used by industrial equipment, so that the working efficiency of the equipment is improved, and the damage of the equipment is reduced.
In transportation means and military equipment, an internal combustion engine is an indispensable device, fuel of the internal combustion engine is fully combusted, sufficient air is required to be supplied to the internal combustion engine from the outside, oxygen in the air is utilized to support fuel combustion, when the air entering the internal combustion engine contains sand grains, dust, scraps and other impurities, the impurities can wear the internal combustion engine, the service life of the internal combustion engine is shortened, an air filter is required to be installed in an air supply channel of the internal combustion engine in order to prevent the impurities from entering the internal combustion engine, and the air filter is a matching device required for normal operation of the internal combustion engine.
The existing air filters for supplying air to the internal combustion engine are mainly used for separating impurities from air by centrifugal force and then filtering the impurities by a filter element, so that clean air is obtained. For example, cyclone filters operate on the principle of devices that utilize centrifugal force to separate solid particles or droplets from a gas stream. When the air flow containing liquid or impurities enters the filter, the air flow can generate strong vortex motion due to the design of the vortex in the cyclone cylinder, so that strong centrifugal force is formed, and solid particles and liquid impurities are attached to the cyclone cylinder. Impurities, after being separated from the gas stream, accumulate in the dust accumulation zone of the vessel. The purified gas leaves the cyclone filter and enters the next stage of fine filtering device, one or more filter elements are arranged in the fine filtering device, and small solid particles can be filtered out.
The problems with the above air cleaner are:
1. when the air flow rotates at high speed, wall pressure is generated on the inner wall of the cyclone filter, and the wall pressure blocks tiny dust of small particles or impurities with smaller specific gravity (particularly plant fragments, catkin, poplar and other floaters) from approaching, so that the impurities cannot be settled and removed.
2. When using a plurality of cyclone filters to purify air, a plurality of cyclone filters need to be arranged side by side, occupy larger space, have restricted its application scope.
3. Traditional filtering modes such as a metal filter screen filter, a fiber filter, a paper filter and the like belong to passive adsorption type filtering; the passive filtering approach only produces two results: one is that dust passes through the filter, which does not play a role; secondly, dust is adsorbed on the filter, and the airflow channel on the filter is gradually blocked, and the air inflow is gradually reduced. In order to ensure that the filter in the passive filtering mode works normally, the filter element must be cleaned or replaced frequently, so that time and effort are wasted, the material cost for using the filter element in a large amount is high, and the operation of the internal combustion engine is influenced and even serious accidents are caused if the filter element is cleaned or replaced in an emergency.
4. When the filter element meets humid external environments such as rainwater, dew and the like, the water enters the fine filter device, and a dust layer on the surface of the filter element can become mud when meeting the water, so that the blockage of an airflow channel is more serious.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a multi-layer combined air filtering device which can separate large particles, small particles and floaters from air automatically and stably provide clean air; the air filter device can directly discharge impurities while conveying clean air, so that accumulated impurities are prevented from blocking the air filter device, the trouble of manually cleaning the air filter device is avoided, manpower, material resources and financial resources are saved, long-time normal operation can be ensured under the condition of not cleaning, the operation of an internal combustion engine is supported, the structure is compact, the occupied space is small, and the application range is wider.
In order to achieve the above object, the present invention provides the following technical solutions:
The multi-layer combined air filtering device is characterized by comprising a filtering structure and a shell, wherein an air inlet and a clean air outlet are arranged on the shell, and the filtering structure is positioned in the shell and fixedly connected with the shell; the filter structure comprises a plurality of filter tubes, wherein the filter tubes are sleeved layer by layer, the edge of one end of each filter tube is connected with one layer of filter tube in the filter tube, the edge of the other end of each filter tube is connected with one layer of filter tube in the filter tube, the filter tube in the innermost layer is a central tube, the free end of the central tube is connected with the bottom of the tube to form a closed structure, the filter tube in the outermost layer is a peripheral tube, and the edge of the peripheral tube is fixedly connected with the shell; the filter structure divides the space in the shell into two parts, one side of the central tube, which faces the opening, is a clean side, one side of the central tube, which faces away from the opening, is an air inlet side, the air inlet is positioned on the air inlet side, the clean air outlet is positioned on the clean side, a plurality of gaps are formed among the central tube, the filter tube and the peripheral tube, the gaps with the openings facing the air inlet side are air filtering channels, the gaps with the openings facing the clean side are clean channels, the air filtering channels are mutually communicated, the dust discharging tube is connected to the air filtering channel on the outermost layer, and the dust discharging tube extends out of the shell; the side walls of the central tube, the filter tube and the peripheral tube are provided with a plurality of flow guide channels extending into the clean channel, the flow guide channels deviate from the opening direction of the clean channel and form an included angle alpha with the side wall, the included angle alpha is smaller than 90 degrees, and the sum of the sectional areas of the flow guide channels connected with the air filtering channels is larger than the sectional area of the air filtering channels.
In the present invention, it is preferable that the included angle α is 10 ° to 60 °.
In the present invention, preferably, a fan is installed at the outlet of the air inlet and/or the dust exhaust pipe.
In the present invention, preferably, the air filtering channel includes a tightening region and an expansion region, the cross-sectional area of the expansion region is larger than that of the tightening region, two ends of the expansion region are respectively connected with a section of the tightening region, the flow guiding channels are all arranged in the expansion region, the connection part between the side wall of the expansion region and the side wall of the tightening region is a transition side wall, the transition side wall and the side wall of the tightening region have an included angle beta, and the included angle beta is smaller than 90 degrees.
In the present invention, it is preferable that the included angle β is 1 ° to 30 °.
In the present invention, preferably, the flow guide channel includes air holes provided on the side walls of the central tube, the peripheral tube and the filter tube, and a flow guide fixed to the edges of the air holes.
In the present invention, preferably, the guide vane is in a straight line shape, a circular arc shape or a zigzag shape.
In the present invention, preferably, a plurality of protrusions or pits are provided on the inner wall of the air filtering channel.
In the present invention, it is preferable that the cross-sectional shape of the protrusion or the depression is at least one of arc, triangle, and quadrangle.
In the present invention, preferably, the central tube, the filter tube and the peripheral tube are integrally formed.
Compared with the prior art, the invention has the beneficial effects that:
The multi-layer combined air filtering device is sleeved with the central tube, the multi-layer filtering tubes and the peripheral tubes, the side walls of the central tube, the multi-layer filtering tubes and the peripheral tubes are provided with the diversion channels, the dust and the clean air are automatically separated by utilizing the condition that the flow speed of the air in the air filtering channels is larger than that in the diversion channels, so that the clean air flows to the clean channels and flows out from the clean air outlets, the clean air filtered by each filtering unit can be conveyed to a designated area, the central tube, the multi-layer filtering tubes and the peripheral tubes are sleeved together, the formed air filtering channels are mutually communicated, and the impurities in each air filtering channel are discharged to the atmosphere through the dust discharging tube, thereby realizing the separation of the clean air and the impurities, stably providing clean air, avoiding the blockage of the multi-layer combined air filtering device by accumulated impurities, saving the trouble of manually cleaning the multi-layer combined air filtering device, and simultaneously being sleeved and installed between the central tube, the filtering tubes and the peripheral tubes, so that the multi-layer combined air filtering device is compact in structure, saves space and can filter air with higher efficiency.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 13, a preferred embodiment of the present invention provides a multi-layered combined air cleaner, which comprises a filter structure 1 and a housing 2.
In the present embodiment, the filter structure 1 is located in the housing 2 and is fixedly connected to the housing 2. The filter structure 1 comprises a plurality of filter tubes, wherein the radii of the filter tubes are not equal, and the filter tubes are sleeved layer by layer, so that a multi-layer tubular structure can be formed. One end of the filter tube of the innermost layer is not connected with other filter tubes, is a free end, the other end is used for being connected with the filter tube of the outer layer, and is a connecting end, and the free end is connected with a tube bottom 108, so that the tube bottom 108 seals the free end of the filter tube, and gas cannot pass through the free end, and the preferred shape of the tube bottom 108 is circular arc shape or bullet shape. Since the filter tube of the innermost layer has a different shape from other filter tubes, it is referred to as a center tube 101 for convenience of description. The side wall of the connecting end of the central tube 101 is turned outwards so as to be connected with the side wall of the filtering tube 103 on the outer layer; likewise, the side wall of the other end of the filter tube 103 connected to the center tube 101 is turned outwards so as to be connected to the side wall of the filter tube 103 of the outer layer; the edge of one end of each filter tube 103 is connected with the filter tube 103 of one layer in the filter tube, and the edge of the other end is connected with the filter tube 103 of the other layer until all the filter tubes 103 are connected, so that the multi-layer tubular filter structure 1 is formed. For convenience of description, the outermost filter tube is named as a peripheral tube 102, and the edge of the peripheral tube 102 has an everted shape, so that the filter tube is convenient to connect with the inner wall of the shell 2, and the connection part between the peripheral tube 102 and the inner wall of the shell 2 has good tightness, so that gas cannot pass through the filter tube.
The filter structure 1 divides the space in the housing 2 into two parts, and the side of the central tube 101 facing the opening, i.e. the side away from the tube bottom 108, is named clean side; the side of the central tube 101 facing away from the opening, i.e. the side close to the tube bottom 108, will be designated as the inlet side. Annular gaps are formed between the side walls of the central tube 101, the filter tube 103 and the peripheral tube 102, and columnar gaps are formed in the middle of the side walls of the central tube 101, and the gaps have openings facing the air inlet side and the clean side, and for convenience of description, the gaps having openings facing the air inlet side are designated as air filtering channels 3, and the gaps having openings facing the clean side are designated as clean channels 4. The air passages 3 are communicated with each other in a certain manner, so that air containing impurities can be collected and discharged uniformly, and for example, a connection pipe 109 is provided between the air passages 3 to communicate them. At the same time, the outermost air filtering channel 3 is connected with a dust discharging pipe 5, and the dust discharging pipe 5 extends out of the shell 2, so that the dust discharging pipe 5 is not communicated with the space in the shell 2, and the air containing impurities is ensured to be directly discharged back to the atmosphere, and the guided clean air is not polluted. The side walls (or inner walls) of the two sides of the gas filtering channel 3 may be the side walls (or inner walls) of the central tube 101, the filtering tube 103 or the outer tube, but their properties are not different, and for convenience of description, they will be referred to as the side walls (or inner walls) of the gas filtering channel 3, and they are distinguished as the side walls (or inner walls) of the central tube 101, the filtering tube 103 or the outer tube 102.
The side walls of the central tube 101, the filter tube 103 and the peripheral tube 102 are provided with a plurality of diversion channels. The main body of the diversion channel is positioned in the clean channel 4, namely the diversion channel extends into the clean channel 4, and the opening of the diversion channel is positioned at the side wall of the air filtering channel 3, so that the air of the air filtering channel 3 can enter the diversion channel and enter the clean channel 4 from the diversion channel. The flow guide channel is a section of structure capable of guiding airflow to flow in a certain direction, can be of a tubular structure, can be a simpler wind shield, is fixedly connected with the side face of the air filtering channel 3, and is communicated with the air filtering channel 3.
The direction of the flow guiding channel should be inclined to the side wall of the clean channel 4, and the air outlet direction of the flow guiding channel should be far away from the opening direction of the clean channel 4 as far as possible, so that the flow guiding channel is far away from the opening direction of the clean channel 4 and forms an included angle alpha with the side wall, and the included angle alpha is smaller than 90 degrees. The angle between the two is understood to be the angle between the shape of the whole diversion channel and the air filtering channel 3. For example, if the flow guiding channel is straight, the included angle between the straight line where the flow guiding channel is located and the straight line where the air filtering channel 3 is located is the included angle α; for another example, if the flow guide channel is in a circular arc shape, the included angle between the tangent line of the middle point of the circular arc where the flow guide channel is located and the straight line where the air filtering channel 3 is located is the included angle alpha; for another example, if the flow guide channel is in an irregular shape, the angle trend of the included angle between the overall shape of the flow guide channel and the air filtering channel 3 needs to be considered, for example, the included angle between the tangent line of each point of the irregular flow guide channel and the air filtering channel 3 is taken as positive and negative angles, and the total angles are obtained by summing the angles, namely the included angle alpha
In addition, the sum of the sectional areas of the diversion channels connected with the air filtering channels 3 is larger than the sectional area of the air filtering channel 3.
The housing 2 is provided with an air inlet 201 and a clean air outlet 202, the air inlet 201 being located on the air inlet side and the clean air outlet 202 being located on the clean side.
Specifically, the working principle of the air filter device is as follows: when air flow with a certain speed exists in the external air, the air inlet 201 is faced to the air flow direction, so that the external air enters the air filtering channel 3 from the air inlet 201, and impurities exist in the air entering the air filtering channel 3. In the air filtering channel 3, the air containing impurities flows to the deep part of the air filtering channel 3, when passing through the position of the flow guiding channel, part of the air enters the flow guiding channel and flows out from the outlet of the flow guiding channel, and the part of the air is clean air.
The sum of the sectional areas of the diversion channels is larger than the sectional area of the air filtering channel 3, and the friction of the air flow in the air filtering channel 3 and the diversion channels consumes energy, so that the air flow speed in the diversion channels is slower than the air flow speed in the air filtering channel 3. The motion trend of the impurities such as sand grains, floccules, dust, water drops and the like wrapped in the air flow in the air filtering channel 3 under the action of the air flow in two directions is that the impurities move from the air inlet 201 to the deep part of the air filtering channel 3 and approach to the inlet of the flow guiding channel from the center position of the air filtering channel 3, but because the attraction force of the flow guiding channel is smaller, the motion inertia of the impurities cannot be overcome, namely the air flow speed in the air filtering channel 3 is higher than the air flow speed in the flow guiding channel, the situation that the impurities are provided with the flow guiding channel in the air filtering channel 3 before entering the flow guiding channel can be realized, so the impurities cannot enter the flow guiding channel, and clean air and the impurities can be separated by themselves. The ratio or difference between the air flow speed in the diversion channel and the air flow speed in the air filtering channel 3 can be adjusted by adjusting the difference between the sectional areas of the two channels and adding power sources such as fans in the pipeline.
At the same time, the air flow in the air filtering channel 3 has strong dynamic pressure, and when the high-pressure air impacts the inner wall of the diversion channel, a high-pressure area is generated on the inner wall of the diversion channel. The Bernoulli principle shows that the flow velocity of the air flow at the central position of the air filtering channel 3 is high, but the static pressure is low; the flow guide channels around the air filtering channel 3 and the air flow in the area nearby the air guide channels have certain kinetic energy loss, the flow speed is low, but the static pressure is high. In this case, the impurities such as particles, floc, water drops and the like which are wrapped by the air flow in the air filtering channel 3 generate pressure difference under the action of unequal static pressure, and then displace, and the impurities move to the center position of the air flow with small static pressure and cannot enter the diversion channel, so that the impurities are smoothly discharged back to the atmosphere from the dust exhaust pipe 5 along with the air flow in the air filtering channel 3.
On the other hand, the air in the diversion channel flows obliquely backward relative to the air in the air filtering channel 3, namely, the air in the diversion channel flows obliquely backward at an included angle alpha with the air flowing direction in the air filtering channel 3, the air flows into the diversion channel and flows obliquely backward, a static pressure which is larger than the pressure of the central part of the air flow in the air filtering channel 3 is formed at the inlet of the diversion channel, and the static pressure can push lighter impurities (such as floccules) close to the inlet of the diversion channel back to the position in the center of the air filtering channel 3, so that the lighter impurities cannot enter the diversion channel, and can continue to move deeply along with the air flowing into the air filtering channel 3. And heavier impurities (such as sand grains) can strike the inner wall of the diversion channel if reaching the inlet of the diversion channel, are ejected back to the center of the air filtering channel 3, and keep moving deep into the air filtering channel 3 due to own inertia, but not move in the diversion channel obliquely backward.
Through the three processes, clean air without impurities can be guided out from the diversion channel, and impurities such as particulate matters, floaters and the like are discharged from the dust exhaust pipe 5 along with the air flow in the air filtering channel 3, so that the clean air is obtained by utilizing the multi-layer combined air filtering device. The air flow required for the air filtering work can be natural wind or artificial wind.
The device utilizes the air current to directly discharge impurities in the air from the air filtering channel 3, utilizes the flow guiding channel to guide clean air out, utilizes the clean air outlet 202 on the shell 2 to convey to a designated area, realizes the separation of large particles, small particles and floaters from the air, can stably provide clean air, can directly discharge the impurities while conveying the clean air, avoids the accumulated impurities from blocking the air filtering device, saves the trouble of manually cleaning the air filtering device, and saves manpower, material resources and financial resources.
In a preferred embodiment of the invention, the angle α is 10 ° to 60 °, such as 15 °,25 °, 35 °, 40 °, 59 °, etc. Although the included angle alpha is smaller than 90 degrees, the air can flow obliquely backward after entering the diversion channel, and the dust removal effect is not ideal when the included angle alpha is larger. The air flow velocity in the flow guiding channel is a vector, which can be regarded as being composed of a first vector opposite to the air flow direction in the air filtering channel 3 and a second vector perpendicular to the air flow direction in the air filtering channel 3. When the included angle alpha is larger, the first vector is smaller, the second vector is larger, the attraction of the diversion channel to the impurities is stronger, the impurities are easily guided out of the diversion channel, and the separation effect of air and the impurities is poorer, so that the angle of the included angle alpha is smaller, and the better choice is not more than 60 degrees. When the included angle α is extremely small, the first vector is extremely large, the second vector is extremely small, and air is difficult to flow into the diversion channel, so that clean air cannot be led out, and therefore the included angle α cannot be too small, and is preferably not smaller than 10 °. Through setting the contained angle alpha between 10 and 60, can make impurity be difficult for getting into the water conservancy diversion passageway, clean air can easily get into the water conservancy diversion passageway simultaneously, from realizing better air and impurity separation effect.
In a preferred embodiment of the invention, the fans 6 are mounted at both the air inlet 201 and the dust exhaust pipe 5, or one of them is mounted with a fan 6, and the fans 6 mounted at both of them are capable of generating an air flow from the air inlet 201 to the dust exhaust pipe 5. When the outside has larger air flow, the multi-layer combined air filter device can work normally only by facing the air inlet 201 to the direction of the outside air flow, but when the outside air flow does not meet the requirement, the air flow is manufactured manually to meet the requirement of the multi-layer combined air filter device. In addition, the fan 6 can be installed at the clean air outlet 202, the fan 6 can generate air flow for making clean air flow out of the shell 2, clean air is quickly conveyed to a designated area, the rotating speed of the fan 6 is regulated, the effect of regulating the flow speed of clean air can be achieved, and then the air flow speed in the diversion channel is controlled to a certain extent, so that the effect of regulating the filtering effect of the air filtering channel 3 is achieved. The fans 6 are arranged at the air inlet 201 or the dust exhaust pipe 5, or the fans 6 are arranged at both positions, so that the device can remove impurities and lead out clean air without depending on external air flow, the air flow speed is adjustable, and the working process is more efficient.
In a preferred embodiment of the invention, the air-filtering passageway 3 comprises a tightening zone 301 and an expansion zone 302. Wherein the cross-sectional area of the expansion region 302 is larger than the cross-sectional area of the contraction region 301. Two ends of the expansion area 302 are respectively connected with a section of tightening area 301, and after entering the air filtering channel, air firstly enters the tightening area 301, then enters the expansion area 302, then enters the tightening area 301 of the next section, and finally flows to the dust exhaust pipe 5. The diversion channels are all arranged in the expansion area 302, and the side wall of the tightening area 301 is not connected with the diversion channels. The portion where the side wall of the extension area 302 is joined to the side wall of the tightening area 301 is a transition side wall 303, which is used for the transition between the extension area 302 and the tightening area 301, so that an angle is necessarily formed between the transition side wall 303 and the inner wall of the tightening area 301, and for convenience of description, the included angle between these two surfaces is used to describe their positional relationship, the included angle is defined as an included angle β, and the included angle β is smaller than 90 °. When air flows in the tightening area 301, the air flow speed is higher due to the smaller sectional area of the tightening area 301, so that a higher speed can be provided for impurities; when the air flows into the expansion area 302, the cross-sectional area of the expansion area 302 is larger, impurities are relatively far away from the inlet of the diversion channel, the air flow speed is slower, the impurities are faster before the impurities, and the impurities still can keep faster speed in the expansion area 302 to pass through the expansion area 302 due to the action of inertia, so that the time for the impurities to pass through the expansion area 302 can be shortened as much as possible, and the probability of the impurities entering the diversion channel is reduced. However, if the inclined transition side wall 303 is not provided between the tightening region 301 and the expansion region 302 for transition, when air flows from the tightening region 301 to the expansion region 302, the air is separated from the inner wall of the expansion region 302, and the amount of clean air led out of the diversion channel is reduced; when air flows from the expansion area 302 to the contraction area 301, vortex is generated at a portion where the expansion area 302 is connected to the contraction area 301, and the air flow is blocked, thereby affecting the discharge of impurities. Thus, the transition sidewall 303 should have a transition shape, i.e., the included angle β should be less than 90 °, so that air is as close to the inner wall of the expansion zone 302 as possible, so that vortex generation is minimized, or so that vortex generation is as small as possible.
By arranging the air filtering channel 3 into a structure that the expansion area 302 and the tightening area 301 are connected, and the included angle beta between the transition side wall 303, which is connected with the expansion area 302 and the tightening area 301, and the tightening area 301 is smaller than 90 degrees, the probability that impurities enter the diversion channel can be further reduced, the impurity removing effect is improved, the efficiency of leading out clean air by the diversion channel is reduced only a limited extent, and the effect of filtering air is good as a whole.
In a preferred embodiment of the invention, the angle β is optimally in the range of 1 ° to 30 °, such as 10 °, 20 °, 30 °, etc. The more gentle the transition portion between the extension area 302 and the tightening area 301, the better the effect of air clinging to the inner wall, and the less the possibility of generating vortex, the smaller the vortex even if generated, therefore, when the included angle β is 1 ° to 30 °, the effect of air clinging to the inner wall in the air filtering channel 3 is good, the effect of vortex is small, and the effect of improving the impurity removing effect and basically not reducing the efficiency of guiding clean air can be achieved.
In a preferred embodiment of the present invention, the flow guide channel comprises an air hole 104 and a flow guide 105. The air filtering channel 3 is provided with air holes 104, the edge of each air hole 104 is fixedly connected with a guide vane 105, the space between two adjacent guide vanes 105 is the guide channel, the surface of each guide vane 105 is in contact with clean air, so that the surface of each guide vane 105 is the inner wall of the guide channel, the direction of each guide vane 105 determines the direction of the guide channel, and the included angle between each guide vane 105 and the side surface of the air filtering channel 3 is the included angle alpha. The shape of the baffle 105 may be selected from a variety of shapes, such as a rectangle, square, diamond, trapezoid, semicircle, etc. with a plane or curved surface. By arranging the air holes 104 on the air filtering channel 3 and connecting the guide plates 105 along the edges of the air holes 104, the guide channels can be connected on the side surfaces of the air filtering channel 3, so that clean air and impurities are separated.
In a preferred embodiment of the present invention, the baffle 105 is linear, circular arc or zigzag. When the straight-line guide vane is adopted, the included angle between the guide vane 105 and the side surface of the air filtering channel 3 is an included angle alpha, and air flows along the direction of the straight-line guide vane when passing through; when the circular arc-shaped guide vane 110 is adopted, the included angle between the tangent line at the middle point of the circular arc-shaped guide vane 110 and the side surface of the air filtering channel 3 is the included angle alpha, and when air passes through, the air flows along the direction of the circular arc-shaped guide vane 110, and the integral flowing direction of the air flows and the air filtering channel 3 form the included angle alpha; when the zigzag-shaped guide vane 111 is adopted, the part of the zigzag-shaped guide vane 111 inclined to the side surface of the air filtering channel 3 determines the overall direction of the zigzag-shaped guide vane, the included angle between the zigzag-shaped guide vane 111 and the side surface of the air filtering channel 3 is the included angle alpha, and when air passes through, the air flows along the direction of the part of the zigzag-shaped guide vane 111 inclined to the side surface of the air filtering channel 3, is folded to the direction opposite to the air flow in the air filtering channel 3, and is finally guided out of the guide channel. The guide vanes 105 in the straight line shape, the circular arc shape or the fold line shape can form a guide channel, so that the separation of clean air and impurities is realized, and the structure is simple and the realization is easy.
In a preferred embodiment of the present invention, a plurality of protrusions 106 or pits 107 are provided on the inner wall of the air filtering channel 3, the protrusions 106 or pits 107 may be continuously or alternately provided, the number of the protrusions or pits is not fixed, the inner wall of the air filtering channel 3 may be fully distributed, and some blank areas may be left, and the protrusions 106 or pits 107 function to roughen the inner wall of the air filtering channel 3, so as to increase the surface friction of the inner wall of the air filtering channel 3. The inner wall of the air filtering channel 3 is provided with the protrusions 106 and the pits 107, so that the surface friction force is increased, the static pressure on the inner wall is increased, and impurities are more stably positioned in the center of the air flow between the air filtering channels 3, so that the impurities are more difficult to enter the flow guiding channels, and clean air can be more stably provided by the device.
In a preferred embodiment of the present invention, if the protrusions 106 or the recesses 107 are provided on the inner wall of the air filtering passageway 3, the cross-sectional shape of these protrusions 106 or recesses 107 may be one or more of arc, triangle, quadrangle. By providing the protrusions 106 or the recesses 107 having these shapes, it is possible to achieve an effect of increasing the roughness of the inner wall surface of the air-filtering passages 3 and to achieve an object of increasing the friction force, to increase the static pressure on the inner wall of the air-filtering passages 3, to make the impurities more stably located at the center position of the air flow between the air-filtering passages 3, and to make it more difficult to enter the flow-guiding passages.
In a preferred embodiment of the present invention, the central tube 101, the bottom 108, the filter tube 103 and the peripheral tube 102 are integrally formed. The central tube 101, the tube bottom 108, the filter tube 103 and the peripheral tube 102 have a close connection relationship, and the gas cannot pass through the tube, and the shape is not complex, so that the components can be directly manufactured into an integrally formed integral component by using a die. By adopting the structure in which the central tube 101, the tube bottom 108, the filter tube 103 and the peripheral tube 102 are integrally formed, good sealing performance of the filter structure 1 can be achieved, and the disassembly and assembly process can be simplified.
The foregoing description is directed to the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the invention, and all equivalent changes or modifications made under the technical spirit of the present invention should be construed to fall within the scope of the present invention.