CN107647777B - Pressure device - Google Patents

Abstract

The invention discloses a pressure appliance, comprising: the pressure container, cover plate, overvoltage power-off switch and touching device, the cover plate is set on the pressure container, the pressure space is limited between the cover plate and the pressure container, the cover plate is formed with through hole; the overvoltage power-off switch is arranged on the cover plate and is positioned at the through hole; the touch device is arranged between the cover plate and the overvoltage power-off switch, the touch device comprises a push rod and an elastic sealing piece, the push rod is movably arranged between the cover plate and the overvoltage power-off switch, the first end of the push rod is suitable for touching the overvoltage power-off switch to enable the overvoltage power-off switch to be disconnected, the elastic sealing piece is arranged at the through hole, the elastic sealing piece is connected with the second end of the push rod, and when the pressure in the pressure space reaches a preset pressure, the pressure in the pressure space directly acts on the elastic sealing piece to drive the push rod to move to touch the overvoltage power-off switch to enable the overvoltage power-off switch to be disconnected to. According to the pressure appliance disclosed by the invention, the use safety of the pressure appliance is effectively ensured.

Description

Pressure device

Technical Field

The invention relates to the field of pressure equipment, in particular to a pressure appliance.

Background

In the related art, there are generally two modes for protecting a pressure vessel such as an electric pressure cooker or an electric pressure cooker: 1. directly discharging pressure medium gas or liquid for pressure relief. However, this mode does not cut off the power supply, and the pressure medium discharge passage is easily clogged, and the device is easily failed. 2. Temperature overtemperature and overvoltage protection: the temperature in the container is sensed by the temperature sensor, and the working power supply is cut off by the mechanical temperature controller or the electric control program, so that the pressure container stops working, and the pressure is reduced. However, in this mode, pressure and temperature conversion is required, so that the control accuracy is not high and the safety performance is low. In the normal use process of the electric pressure cooker, the normal pressure relief is usually realized by adopting the two pressure relief devices or a mode of enabling a leak between a cooker body and a cover body of the electric pressure cooker (at the moment, the electric pressure cooker is an elastic pressure cooker). However, when the pressure release valve fails or the normal leak between the pot body and the cover body cannot be formed to discharge the gas in the electric pressure cooker, the electric pressure cooker is easy to explode, and therefore, the user is injured.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. To this end, it is an object of the invention to propose a pressure appliance which is highly safe.

The pressure appliance according to the present invention comprises: a pressure vessel; the cover plate is arranged on the pressure container, a pressure space is defined between the cover plate and the pressure container, and a through hole is formed in the cover plate; the overvoltage power-off switch is arranged on the cover plate and is positioned at the through hole; the touch device is arranged between the cover plate and the overpressure power-off switch and comprises a push rod and an elastic sealing piece, the push rod is movably arranged between the cover plate and the overpressure power-off switch, the first end of the push rod is suitable for touching the overpressure power-off switch to disconnect the overpressure power-off switch, the elastic sealing piece is arranged at the through hole and connected with the second end of the push rod, and when the pressure in the pressure space reaches a preset pressure, the pressure in the pressure space directly acts on the elastic sealing piece to drive the push rod to move to touch the overpressure power-off switch to disconnect the overpressure power-off switch to cut off the power supply of the pressure appliance.

According to the pressure device, the overvoltage power-off switch and the touch device are arranged, when the pressure in the pressure space reaches the preset pressure, the pressure in the pressure space can directly act on the touch device to disconnect the overvoltage power-off switch, so that the power supply of the pressure device can be cut off, a mechanical temperature controller or an electric control program is not needed to be adopted to indirectly cut off the power supply, the use safety of the pressure device is effectively guaranteed, the control precision is high, and the reliability is high. In addition, the mode of cutting off the power supply is adopted to avoid abnormal overvoltage, and whether the pressure medium discharge channel is blocked or not, the safe use of the pressure appliance can be ensured.

According to some embodiments of the invention, the through hole comprises a first hole section and a second hole section communicating in sequence in a direction from the cover plate towards the over-pressure off-switch, the second hole section having a larger cross-sectional area than the first hole section, wherein the elastic sealing member is provided on the second hole section, the elastic sealing member is supported on a connection surface of the first hole section and the second hole section when the pressure in the pressure space does not reach a predetermined pressure, and the elastic sealing member is deformed towards the over-pressure off-switch when the pressure in the pressure space reaches the predetermined pressure.

Optionally, the second bore section is configured to increase in cross-sectional area in a direction away from the first bore section.

Further, a locking groove is formed on the push rod, and the pressure device further comprises: the first end of the locking clamp spring is a fixed end, the second end of the locking clamp spring is a movable end, and the second end of the locking clamp spring is suitable for being matched in the locking groove to enable the overvoltage power-off switch to be kept in an off state.

Optionally, the locking groove is formed on one side of the first end of the push rod, which is adjacent to the center of the push rod, and the second end of the locking clamp spring abuts against the outer peripheral wall of the first end of the push rod when the pressure in the pressure space does not reach a predetermined pressure.

Further, the pressure appliance further comprises: an elastic return member provided on the push rod, the elastic return member being configured to normally urge the push rod toward a direction away from the overvoltage shut-off switch.

Further, the pressure appliance further comprises: the switch bracket is arranged between the cover plate and the overvoltage power-off switch, a guide hole is formed in the switch bracket, and the first end of the push rod is suitable for penetrating through the guide hole to touch the overvoltage power-off switch.

Optionally, the elastic sealing element is a silicone gasket or an elastic metal diaphragm.

According to some embodiments of the invention, the overpressure shutoff switch opens and remains in the open state when the pressure in the pressure space reaches a predetermined pressure.

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

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is an exploded view of a pressure vessel according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the pressure instrument shown in FIG. 1;

fig. 3 is another cross-sectional view of the pressure appliance shown in fig. 1.

Reference numerals:

100: a pressure implement;

1: a pressure vessel; 2: a cover plate; 21: a through hole; 211: a first bore section; 212: a second bore section;

3: an overvoltage power-off switch; 4: a touch device;

41: a push rod; 411: a locking groove; 42: an elastomeric seal;

5: locking the clamp spring; 6: an elastic reset member; 7: a switch bracket; 71: a guide hole; 8: and (5) sealing rings.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Apressure appliance 100 according to an embodiment of the present invention is described below with reference to fig. 1-3. When the normal pressure relief device, such as a pressure relief valve, of thepressure apparatus 100 fails and an abnormal overpressure occurs (i.e., the pressure in thepressure apparatus 100 is greater than its normal pressure use range, such as 70kPa (kPa)), theoverpressure shutdown switch 3 of thepressure apparatus 100 can cut off the power supply of thepressure apparatus 100, preventing the pressure in thepressure apparatus 100 from further rising. In the following description of the present application, thepressure device 100 is exemplified as an electric pressure cooker. Of course, it can be understood by those skilled in the art that thepressure appliance 100 can also beother pressure appliances 100, such as an electric pressure cooker, especially a rigid pressure cooker (i.e. the cooker body and the cover are always kept in a completely sealed state during the whole operation of the electric pressure cooker), or a device for controlling and protecting the pressure of various gases and liquids in the fields of petroleum, chemical industry, metallurgy, electric power, water supply, etc.

As shown in fig. 1 to 3, apressure appliance 100, such as an electric pressure cooker, according to an embodiment of the present invention includes apressure vessel 1, acover plate 2, an over-pressure power-off switch 3, and an activating device 4.

Acover plate 2 is provided on thepressure vessel 1, for example, as shown in fig. 1 to 3, the top of thepressure vessel 1 is open, thecover plate 2 is provided on the top of thepressure vessel 1, and a pressure space is defined between thecover plate 2 and thepressure vessel 1, in which food or the like to be cooked can be placed. In order to further ensure the tightness of the pressure space, asealing ring 8 may be provided between thecover plate 2 and thepressure vessel 1. Thecover plate 2 is formed with a throughhole 21, and the throughhole 21 penetrates thecover plate 2 in the thickness direction of thecover plate 2.

The overvoltage cut-off switch 3 is provided on thecover plate 2, and the overvoltage cut-off switch 3 is located on a side (e.g., an upper side in fig. 1 to 3) of thecover plate 2 away from thepressure vessel 1, and the overvoltage cut-off switch 3 is located at thethrough hole 21. The overvoltage power-offswitch 3 is directly connected to a main circuit of thepressure appliance 100, such as an electric pressure cooker, without other sensing and electric control programs, so that the control precision is high and the safety is high. The overvoltage cut-off switch 3 is in a normally closed state to conduct the above-mentioned main circuit, so that thepressure appliance 100, for example, food or the like in the electric pressure cooker, can be cooked. For example, in particular, the overvoltage power-off switch 3 may have a first contact and a second contact connected in the main circuit, the first contact and the second contact being in a normally-contacted state to make the main circuit conductive.

The trigger 4 is arranged between thecover plate 2 and the over-pressure cut-offswitch 3, and when the pressure in the pressure space reaches a predetermined pressure, the pressure in the pressure space directly acts on the trigger 4 through the throughhole 21 to cut off the power supply of thepressure device 100 by the over-pressure cut-offswitch 3. For example, when the pressure in thepressure apparatus 100, such as an electric pressure cooker, is abnormally over-pressurized, the pressure in the pressure space can directly act on the trigger 4 through the throughhole 21, the reliability is high, the problems of blockage and failure of the conventional over-pressure protection device and the like can not occur, the trigger 4 is enabled to act to trigger the over-pressure power-offswitch 3, the first contact and the second contact are separated, so that the over-pressure power-offswitch 3 is changed from a closed state to an open state, the main circuit is disconnected, thewhole pressure apparatus 100, such as the electric pressure cooker, stops working, the pressure in thepressure apparatus 100, such as the electric pressure cooker, can not further rise, and the safety and the reliability of thepressure apparatus 100, such as the electric pressure cooker.

Optionally, the predetermined pressure is P, P satisfying: p is more than 70kPa and less than or equal to 350 kPa. Further, P satisfies: p is more than or equal to 140kPa and less than or equal to 200 kPa. The specific value thereof may be specifically set according to the type of theactual pressure appliance 100, such as an electric pressure cooker, to better meet the actual requirements.

Referring to fig. 1 in conjunction with fig. 2 and 3, the triggering device 4 includes: apush rod 41 and anelastic sealing member 42, thepush rod 41 being movably disposed between thecover plate 2 and the over-pressure off-switch 3, a first end (e.g., an upper end in fig. 1-3) of thepush rod 41 being adapted to actuate the over-pressure off-switch 3 to open the over-pressure off-switch 3. When thepush rod 41 is located at the position shown in fig. 2, the second contact of the overvoltage power-off switch 3 is always in contact with the first contact, and when the pressure in thepressure device 100, such as an electric pressure cooker, is abnormally overpressure, thepush rod 41 can move upward and touch the overvoltage power-off switch 3, so that the second contact is disconnected from the first contact, and power-off protection is realized.

An elastic sealingmember 42 is provided at the throughhole 21, the elastic sealingmember 42 is connected to a second end (e.g., a lower end in fig. 1-3) of thepush rod 41, and when the pressure in the pressure space reaches a predetermined pressure, the pressure in the pressure space directly acts on the elastic sealingmember 42 to move thepush rod 41 to actuate theoverpressure shutoff switch 3.

For example, as shown in fig. 2 and 3, anelastic sealing member 42 is sealingly connected to the throughhole 21 to separate a pressure space from an upper space of thecover plate 2 where theovervoltage shutoff switch 3 is located, so that the elastic sealingmember 42 can be operated by a pressure difference between two sides, apush rod 41 is disposed between thecover plate 2 and theovervoltage shutoff switch 3, thepush rod 41 can move up and down, an upper end of thepush rod 41 is adapted to actuate theovervoltage shutoff switch 3, a lower end of thepush rod 41 is connected to the elastic sealingmember 42, and when thepush rod 41 moves up from the position shown in fig. 2 to the position shown in fig. 3, the elastic sealingmember 42 drives thepush rod 41 to move up to actuate theovervoltage shutoff switch 3, so that the first contact and the second contact of theovervoltage shutoff switch 3 are disconnected, thereby disconnecting a main circuit of thepressure device 100. Thus, the reliability of thepressure appliance 100, e.g. an electric pressure cooker, is improved, since the resilient sealing 42 and thepush rod 41 do not need to pass through a pressure medium discharge channel or the like, as is required in conventional overpressure protection, but are in direct contact with the pressure medium in the pressure space.

According to thepressure appliance 100, such as an electric pressure cooker, provided by the overvoltage power-off switch 3 and the touch device 4, when the pressure in the pressure space reaches the preset pressure, the pressure in the pressure space can directly act on the touch device 4 to turn off the overvoltage power-off switch 3, so that the power supply of thepressure appliance 100, such as the electric pressure cooker, can be cut off, a mechanical temperature controller or an electric control program is not needed to be adopted to indirectly cut off the power supply, the use safety of thepressure appliance 100, such as the electric pressure cooker, is effectively ensured, the control precision is high, and the reliability is high. In addition, by using the power supply cut-off mode to avoid abnormal overpressure, thepressure device 100 can be safely used regardless of whether the pressure medium discharge channel is blocked.

Further, the throughhole 21 includes afirst hole section 211 and asecond hole section 212 which are sequentially communicated in a direction from thecover plate 2 toward the overvoltage cut-off switch 3 (e.g., a direction from bottom to top in fig. 2 and 3), and a cross-sectional area of thesecond hole section 212 is larger than that of thefirst hole section 211, when the throughhole 21 is a stepped hole. Theelastic sealing element 42 is arranged on thesecond hole section 212, the edge of theelastic sealing element 42 is connected with thesecond hole section 212 in a sealing mode, when the pressure in the pressure space does not reach a preset pressure (for example, the pressure is smaller than the preset pressure), theelastic sealing element 42 is supported on the connecting surface of thefirst hole section 211 and the second hole section 212 (as shown in fig. 2), at the moment, theelastic sealing element 42 is in contact with the inner wall surface of thesecond hole section 212 to play a further sealing effect, and when the pressure in the pressure space reaches the preset pressure, theelastic sealing element 42 deforms towards the direction of the overvoltage power-off switch 3 (as shown in fig. 3) to drive thepush rod 41 to move upwards so as to disconnect the overvoltage power-off switch 3. In the process that theelastic sealing element 42 moves from the position shown in fig. 2 to the position shown in fig. 3, the pressure-receiving area of theelastic sealing element 42 is increased suddenly, so that the action force of thepush rod 41 is increased suddenly, and the action reliability of the touch device 4 is further improved.

Optionally, thesecond bore section 212 is configured to gradually increase in cross-sectional area in a direction toward away from the first bore section 211 (e.g., from bottom to top in fig. 2 and 3). Thereby, the pressure area of the elastic sealingmember 42 is further increased, and the reliability of the operation of the triggering device 4 is further improved.

According to a further embodiment of the present invention, as shown in fig. 1 to 3, thepush rod 41 is formed with a lockinggroove 411, and thepressure device 100 further includes: the first end of the lockingclamp spring 5 is a fixed end, the first end of the lockingclamp spring 5 is fixed, the second end of the lockingclamp spring 5 is a movable end, the second end of the lockingclamp spring 5 is movable relative to the first end of the locking clamp spring, and the second end of the lockingclamp spring 5 is suitable for being matched in the lockinggroove 411 to enable the overvoltage power-off switch 3 to be kept in an off state. Therefore, through the matching of the lockingclamp spring 5 and thepush rod 41, the overvoltage power-off switch 3 cannot be automatically reset after being used once (namely, the overvoltage power-off switch 3 is disconnected), and the first contact and the second contact of the overvoltage power-off switch 3 cannot be contacted again to enable the main circuit to be conducted, so that the safety of thepressure appliance 100 such as an electric pressure cooker is improved.

Alternatively, a locking groove 411 is formed at a side (e.g., a lower side in fig. 2 and 3) of the above-mentioned first end of the push rod 41 adjacent to the center of the push rod 41, and when the pressure in the pressure space does not reach a predetermined pressure, the overpressure cutoff switch 3 is closed, and the above-mentioned second end of the locking snap spring 5 abuts against the outer peripheral wall of the above-mentioned first end of the push rod 41 due to the torsion force of the locking snap spring 5 itself, as shown in fig. 2; when the pressure in the pressure device 100, such as an electric pressure cooker, is abnormally over-pressurized, the push rod 41 will move upward, in the process, the second end of the locking clip spring 5 will move downward along the side wall of the push rod 41 relative to the push rod 41, and due to the torsion action of the locking clip spring 5, the second end of the locking clip spring 5 will enter the locking groove 411 and abut against the inner wall of the locking groove 411, as shown in fig. 3, at this time, due to the limiting action of the locking clip spring 5, the push rod 41 will not move downward to return the over-pressure power-off switch 3 to the closed state, but will be kept in the open state, thereby effectively ensuring the safety of the pressure device 100, such as an electric pressure cooker. In addition, the lockingclamp spring 5 is simple in structure, and the overvoltage power-off switch 3 can be easily prevented from resetting.

Alternatively, as shown in fig. 2 and 3, the lockinggroove 411 is formed as an annular groove extending in the circumferential direction of thepush rod 41, thereby simplifying the processing process of thepush rod 41 and facilitating the installation of thepush rod 41, thereby improving the assembly efficiency and reducing the cost. Of course, thelock groove 411 may also be formed by a portion of the circumference of thepush rod 41 being recessed inward (not shown). It can be understood that the specific shape of thelocking slot 411 can be specifically set according to actual requirements, as long as it can be used for locking thepush rod 41 in cooperation with the lockingsnap spring 5 when the overvoltage power-off switch 3 is in an off state.

As shown in fig. 1 to 3, thepressure tool 100 further includes: theswitch bracket 7 and theswitch bracket 7 are arranged between thecover plate 2 and the overvoltage power-off switch 3, the overvoltage power-off switch 3 can be installed on theswitch bracket 7, aguide hole 71 is formed in theswitch bracket 7, the first end of thepush rod 41 is suitable for penetrating through theguide hole 71 to touch the overvoltage power-off switch 3, and theguide hole 71 has a guide effect on thepush rod 41 to ensure the accuracy of the movement of thepush rod 41. The lockingsnap spring 5 can be arranged on theswitch bracket 7. Of course, the present invention is not limited thereto, and it is also possible to eliminate theswitch bracket 7, and mount the overvoltage cut-off switch 3 or the like directly on the cover plate 2 (not shown).

Further, thepressure tool 100 further includes: and theelastic resetting piece 6, theelastic resetting piece 6 is arranged on thepush rod 41, and theelastic resetting piece 6 is configured to normally push thepush rod 41 towards the direction away from the overvoltage power-off switch 3. For example, as shown in fig. 1-3, the elastic restoringmember 6 may be a spring, the spring is sleeved outside thepush rod 41, and an upper end of the spring abuts against a top wall of the guidinghole 71 to normally push thepush rod 41 downward, i.e. when the pressure in thepressure appliance 100, such as an electric pressure cooker, is less than a predetermined pressure, thepush rod 41 can be restored under the action of the spring.

Optionally, the elastic sealingmember 42 is a silicone pad or an elastic metal membrane, but is not limited thereto. When the elastic sealingmember 42 is a soft silicone pad, the pressing force of thepush rod 41 against the pressure of the pressure medium in the pressure space is provided by the elastic restoringmember 6. When theelastic seal member 42 is an elastic metal diaphragm, the pressing force of thepush rod 41 against the pressure of the pressure medium in the pressure space is provided by the elastic metal diaphragm.

According to further embodiments of the invention, it is also possible to provide theovervoltage shutdown switch 3 as a non-automatically resettable switch in order to achieve a non-resettable pressure shutdown protection, i.e. theovervoltage shutdown switch 3 is opened and remains in the open state when the pressure in the pressure space reaches a predetermined pressure. It will be appreciated that the non-automatically resettable over-voltage cut-off switch 3 may also be used together with the lockingsnap spring 5 to further improve the safety of the use of thepressure appliance 100, for example an electric pressure cooker.

The working principle of thepressure appliance 100 according to an embodiment of the invention, for example an electric pressure cooker, is as follows:

as shown in fig. 1-3, a pressure working container is composed of apressure container 1, acover plate 2 and asealing ring 8, apush rod 41 makes a sealing gasket and thecover plate 2 tightly installed and sealed through deformation pressure of a spring, thepush rod 41 and the spring are limited through aswitch bracket 7, theswitch bracket 7 is fixed on thecover plate 2, meanwhile, theswitch bracket 7 performs secondary sealing on anelastic sealing element 42, and an overvoltage power-off switch 3 is arranged at a first end of thepush rod 41. Through the formula P ═ F/S, match predetermined pressure value and the spring force of spring,elastic seal 42 deformation force and the through-hole 21 size ofapron 2, when the pressure in the pressure space reached predetermined pressure value, the pressure in the pressure space promotedelastic seal 42 and upwards warp, andelastic seal 42 pressurized area increases suddenly, and pressure grow pushes pushrod 41 and moves, triggers excessive pressure power-off switch 3, cuts off the power. Thepush rod 41 is provided with a lockinggroove 411, and the lockingsnap spring 5 can prevent thepush rod 41 from resetting when the pressure is reduced after thepush rod 41 moves, so that non-resetting pressure power-off protection is formed.

According to thepressure appliance 100, such as an electric pressure cooker, theelastic sealing element 42 connected with thepush rod 41 is directly pushed by pressure medium gas or liquid in the pressure space, the on-off of the overvoltage power-off switch 3 is controlled, so that the power supply of thepressure appliance 100, such as the electric pressure cooker, is cut off, the reliability is high, the control precision is high, and the non-reset power supply cutting-off device meets the requirements of the GB4706.19 standard.

Other constructions and operations of thepressure appliance 100, such as an electric pressure cooker, according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (8)

1. A pressure implement, comprising:

a pressure vessel;

the cover plate is arranged on the pressure container, a pressure space is defined between the cover plate and the pressure container, and a through hole is formed in the cover plate;

the overvoltage power-off switch is arranged on the cover plate and positioned at the through hole, and the overvoltage power-off switch is opposite to the through hole; and

the trigger device is arranged between the cover plate and the overvoltage power-off switch and comprises a push rod and an elastic sealing element, a locking groove is formed in the push rod, the push rod is movably arranged between the cover plate and the overvoltage power-off switch, the first end of the push rod is suitable for triggering the overvoltage power-off switch to enable the overvoltage power-off switch to be disconnected, the elastic sealing element is arranged at the through hole and connected with the second end of the push rod, and when the pressure in the pressure space reaches a preset pressure, the pressure in the pressure space directly acts on the elastic sealing element to drive the push rod to move to trigger the overvoltage power-off switch to be disconnected so as to cut off the power supply of the pressure appliance;

the first end of the locking clamp spring is a fixed end, the second end of the locking clamp spring is a movable end, and the second end of the locking clamp spring is suitable for being matched in the locking groove to enable the overvoltage power-off switch to be kept in an off state.

2. Pressure appliance according to claim 1, characterized in that the through-hole comprises a first hole section and a second hole section communicating in succession in the direction from the cover plate towards the over-pressure shut-off switch, the cross-sectional area of the second hole section being larger than the cross-sectional area of the first hole section,

the elastic sealing element is arranged on the second hole section, when the pressure in the pressure space does not reach the preset pressure, the elastic sealing element is supported on the connecting surface of the first hole section and the second hole section, and when the pressure in the pressure space reaches the preset pressure, the elastic sealing element deforms towards the direction of the overvoltage power-off switch.

3. A pressure implement according to claim 2, wherein the second bore section is configured to increase in cross-sectional area in a direction away from the first bore section.

4. The pressure appliance according to claim 1, wherein the locking groove is formed at a side of the first end of the push rod adjacent to a center of the push rod, and the second end of the locking clip abuts against an outer peripheral wall of the first end of the push rod when the pressure in the pressure space does not reach a predetermined pressure.

5. The pressure implement of claim 1, further comprising:

an elastic return member provided on the push rod, the elastic return member being configured to normally urge the push rod toward a direction away from the overvoltage shut-off switch.

6. The pressure implement of claim 1, further comprising:

the switch bracket is arranged between the cover plate and the overvoltage power-off switch, a guide hole is formed in the switch bracket, and the first end of the push rod is suitable for penetrating through the guide hole to touch the overvoltage power-off switch.

7. Pressure device according to claim 1, characterized in that the elastic sealing is a silicone pad or an elastic metal membrane.

8. A pressure appliance according to claim 1, wherein the over-pressure cut-off switch is opened and remains in the open state when the pressure in the pressure space reaches a predetermined pressure.

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