Sealing mechanism of valve body, pressure release valve and power equipment

Abstract

The utility model discloses a sealing mechanism of a valve body, a pressure release valve and power equipment. The sealing structure of the valve body comprises the valve body which comprises a mounting position arranged in the middle, and a through hole is formed in the mounting position; and the piston is arranged on the mounting position and comprises a piston body and a sealing piece, the sealing piece is arranged on the piston body and forms a whole with the piston body, and the piston abuts against the mounting position through the sealing piece and seals the through hole. According to the pressure release valve, the sealing piece is integrated to the piston, the problem that in the production process of the sealing piece, due to assembly errors or displacement of the sealing piece, the sealing of the valve body fails can be solved, and therefore the sealing reliability of the pressure release valve is improved.

Description

Technical Field

[0001] The present application relates to the technical field of explosion-proof devices, and in particular to a sealing mechanism of a valve body, a pressure relief valve and a power device. Background Art

[0002] The mechanical seal box of the equipment usually contains batteries or other power sources. Due to the characteristics of its sealing mechanism, when unexpected working conditions occur, it is easy to cause deflagration, explosion, etc., resulting in casualties and property losses, posing a greater safety risk to users.

[0003] Existing pressure relief valves generally use O-ring seals for sealing. Usually, an O-ring accommodating groove is set on the valve body, the O-ring is placed in the O-ring accommodating groove by manual assembly, and then the piston is installed on the O-ring to seal.

[0004] However, it is difficult to control the flatness of the surface of the O-ring after assembly using the manual assembly method, which affects the sealing effect between the piston and the valve body. When there is a gap between the O-ring accommodating groove and the O-ring, foreign matter will enter the O-ring accommodating groove through the gap, causing the O-ring to fail to seal. In addition, the existing O-rings have poor long-term sealing performance. Under high and low temperature working conditions, there is a risk of the O-ring sticking and falling off, causing product failure.

[0005] Therefore, the existing pressure relief valve has the problem of sealing failure due to the installation process or long-term use, which affects the sealing reliability of the pressure relief valve. Utility Model Content

[0006] In order to solve the above-mentioned problems existing in the prior art, the present application provides a sealing mechanism of a valve body, a pressure relief valve and a power device, which can improve the sealing reliability of the pressure relief valve.

[0007] This application provides the following technical solutions:

[0008] In a first aspect, a sealing mechanism of a valve body comprises:

[0009] The valve body comprises a mounting position arranged in the middle, wherein a through hole is provided at the mounting position; and

[0010] The piston is arranged on the installation position and comprises a plug body and a sealing member. The sealing member is arranged on the plug body and forms an integral body with the plug body. The piston abuts against the installation position through the sealing member and seals the through hole.

[0011] In one embodiment, an opening is provided in the middle of the plug body and a waterproof and breathable membrane material is covered on the opening, so that the opposite sides of the piston can be breathable through the membrane material.

[0012] In one embodiment, a positioning portion is provided on the periphery of the plug body, and the sealing member is sleeved on the positioning portion.

[0013] In one embodiment, the sealing member extends from one side where the positioning portion is connected to the mounting position to the other side, so that the positioning portion is wrapped inside by the sealing member.

[0014] In one embodiment, the positioning portion is provided with a positioning groove or a positioning hole, and the sealing member is embedded in the positioning groove or the positioning hole for fixation.

[0015] In one embodiment, a positioning portion is provided on the periphery of the plug body, and the sealing member is fixed to the positioning portion by a fixing member.

[0016] In one embodiment, the positioning portion is provided with a positioning groove, and the positioning groove is arranged in the middle position of the plug body in the thickness direction and is arranged around the plug body; or

[0017] The positioning portion is provided with a positioning groove, and the positioning groove is arranged on a side of the positioning portion of the plug body close to the center of the plug body; or

[0018] The positioning portion is provided with a plurality of positioning holes, and the positioning holes are arranged at intervals on the positioning portion.

[0019] In one embodiment, the sealing component is integrally formed with the plug body through a rubber encapsulation process.

[0020] In one embodiment, the sealing member includes a raised portion, the sealing member is arranged around the periphery of the plug body, and abuts against the installation position through the raised portion.

[0021] In a second aspect, the present application provides a pressure relief valve, comprising:

[0022] The valve body comprises a mounting position arranged in the middle, wherein a through hole is provided at the mounting position;

[0023] The piston is arranged on the installation position, and comprises a plug body and a sealing member, wherein the sealing member is arranged on the plug body and forms an integral body with the plug body, and the piston abuts against the installation position through the sealing member and seals the through hole; an opening is arranged in the middle of the plug body and a waterproof and breathable membrane material covering the opening;

[0024] A guide column, one end of which is connected to the piston via the through hole, an opening is provided on the inner side of the guide column, and forms a ventilation channel with the membrane material; and

[0025] An elastic member, disposed between the guide column and the valve body, for controlling the piston to open under pressure or close under normal pressure;

[0026] Wherein, a sealing mechanism as described in any one of the above items is formed between the valve body and the piston.

[0027] In one embodiment, the pressure relief valve further includes a valve cover, which is mounted on the valve body and covers the piston inside the valve cover.

[0028] In a third aspect, the present application further includes a power device, the power device comprising:

[0029] a housing structure; and

[0030] A pressure relief valve is arranged on the housing structure, and the pressure relief valve includes the sealing mechanism of the valve body as described above, or is the pressure relief valve as described in any one of the above items.

[0031] From the above, it can be seen that the sealing mechanism of the valve body, the pressure relief valve and the power equipment provided in the present application can avoid the problem of valve body sealing failure caused by assembly errors or seal displacement during the production process by integrating the seal onto the piston, thereby improving the sealing reliability of the pressure relief valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic structural diagram of the valve body sealing mechanism provided in an embodiment of the present application.

[0033] Figure 2 A schematic cross-sectional structure diagram of the valve body sealing mechanism provided in an embodiment of the present application.

[0034] Figure 3 This is a first structural schematic diagram of the piston provided in an embodiment of the present application.

[0035] Figure 4 This is a second structural schematic diagram of the piston provided in an embodiment of the present application.

[0036] Figure 5 This is a schematic diagram of the second cross-sectional structure of the piston provided in an embodiment of the present application.

[0037] Figure 6 This is a third structural schematic diagram of the piston provided in an embodiment of the present application.

[0038] Figure 7 This is a fourth structural schematic diagram of the piston provided in an embodiment of the present application.

[0039] Figure 8 This is a schematic diagram of the fourth cross-sectional structure of the piston provided in an embodiment of the present application. Fig. 9 A schematic diagram of the structure of a pressure relief valve provided in an embodiment of the present application.

[0040] Fig.10 A schematic diagram of the cross-sectional structure of a pressure relief valve provided in an embodiment of the present application.

[0041] Fig.11 A schematic diagram of the cross-sectional structure of the power equipment provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to facilitate the understanding of the present application, the present application will be described more comprehensively below in conjunction with the accompanying drawings and specific embodiments. The preferred embodiments of the present application are provided in the accompanying drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0043] Please refer to Figure 1-2 , Figure 1 The structure of the valve body sealing mechanism provided in the embodiment of the present application is shown in FIG. Figure 2 The cross-sectional structure of the valve body sealing mechanism provided in the embodiment of the present application is shown.

[0044] like Figure 1-2 As shown, the sealing mechanism is applied in a pressure relief valve, which includes a valve body 1 and a piston 2 mounted on the valve body 1, the piston is provided with an opening 23, and a waterproof and breathable membrane 3 is provided on the piston, the membrane 3 is opposite to the opening 23 and forms a breathable channel. A pressure relief channel for pressure relief is provided inside the valve body 1. When the pressure relief valve is installed on a relatively sealed box, the inner and outer sides of the valve body 1 are separated by the membrane 3 to form a relatively independent space to ensure that the environment inside the sealed box is relatively stable.

[0045] The sealing mechanism may include a valve body 1 and a piston 2. The valve body 1 includes a mounting position 11 disposed in the middle, and a through hole 12 is disposed at the mounting position 11. Specifically, the through hole 12 is used to form a pressure relief channel, and the mounting position 11 may be grooved or provided with a cavity so that the piston 2 can be accommodated in the mounting position 11. The specific structural form of the mounting position 11 may be determined according to actual conditions.

[0046] The piston 2 is arranged on the installation position 11, and includes a plug body 21 and a sealing member 22. The sealing member 22 is arranged on the plug body 21 and forms an integral body with the plug body 21. The piston 2 abuts against the installation position 11 through the sealing member 22 and seals the through hole 12. The sealing member 22 can be made of rubber or other soft materials commonly used for structural sealing. The plug body 21 can be a structure with a circular cross section. The plug body 21 can abut against the installation position 11 through the sealing member 22, and the sealing between the inner and outer sides of the piston 2 is achieved by the abutment between the sealing member 22 and the installation position 11.

[0047] In one embodiment, in order to increase the normal pressure ventilation function of the sealing mechanism, the middle part of the plug body 21 may be provided with an opening 23 and a waterproof and breathable membrane 3 covering the opening 23, and the membrane 3 and the opening 23 of the plug body 21 form a ventilation channel, so that the opposite sides of the piston 2 can be breathable through the membrane 3. Of course, the middle part of the plug body 21 may be provided with an opening 23 and a membrane 3, or may not be provided, which can be adjusted according to the actual needs of customers.

[0048] The membrane material 3 may be e-PTFE or other membrane materials 3 that are waterproof and breathable. In one embodiment, the membrane material 3 may be fixed to the piston 2 via a pressure ring, and the membrane material 3 is directly or indirectly connected to the valve body 1. The membrane material 3 may also be connected to the piston 2 via a hot melt welding process to eliminate the pressure ring. The specific installation method may be determined according to actual conditions.

[0049] In one implementation, a through hole 12 is provided in the middle of the mounting position 11, and bosses are provided around the mounting position 11. The bottom of the piston 2 passes through the mounting position 11 to connect with the guide column 5 of the pressure relief valve, and the periphery of the piston 2 abuts against the bosses through a seal 22 to achieve sealing. The through hole 12 can also be provided with a plurality of reinforcing ribs, and a mounting hole for installation is provided in the middle of the through hole 12. The bottom of the piston 2 passes through the mounting hole to connect with the guide column 5 of the pressure relief valve. Of course, the specific implementation of the mounting position 11 can be determined according to actual conditions.

[0050] In one embodiment, the seal 22 is integrally formed with the plug body 21 through a rubber coating process. Specifically, during the production process of the piston 2, the seal 22 can be formed by injecting a high-temperature liquid colloid into a mold for molding, and cooling and molding to form a seal 22 wrapped around the periphery of the plug body 21. The seal 22 extends from one side where the positioning portion is connected to the mounting position 11 to the other side, so that the positioning portion is wrapped inside by the seal 22. The piston 2 integrally formed with the seal 22 manufactured by the rubber coating process can ensure the matching degree between the seal 22 and the plug body 21, and the position between the plug body 21 and the seal 22 is relatively fixed, thereby improving the molding consistency of the seal 22, thereby avoiding the situation of sealing failure caused by installation errors during the installation of the sealing ring. Further, the seal 22 includes a protrusion 221, which is arranged around the periphery of the plug body 21 and abuts against the mounting position 11 through the protrusion 221. The protrusion 221 can improve the sealing effect between the mounting position 11.

[0051] In another embodiment, the seal 22 can be manually or mechanically sleeved on the outer periphery of the plug body 21 after molding, and the seal 22 extends from one side where the positioning portion is connected to the mounting position 11 to the other side, so that the positioning portion is wrapped inside by the seal 22, so that the seal 22 and the plug body 21 form a whole, and the plug body 21 can be provided with a positioning groove 222 or a positioning hole 211, so that the seal 22 can be fixed by being embedded in the positioning groove 222 or the positioning hole 211 on the plug body 21. The seal 22 can also be fixed to the plug body 21 by a fixing member.

[0052] Of course, there are many ways to form or fix the seal 22 and the plug body 21, such as wrapping the plug body 21 inside the seal 22 or wrapping the seal 22 around at least part of the edge of the plug body 21. It is understandable that the connection and fixing method between the seal 22 and the plug body 21 is not limited.

[0053] As can be seen from the above, by integrating the seal 22 onto the piston 2, the consistency of the sealing effect is improved, and the problem of valve body sealing failure caused by assembly errors or seal displacement of the seal 22 during the production process can be avoided, thereby improving the sealing reliability of the pressure relief valve.

[0054] See also Figure 3 , the figure shows the first structure of the piston provided in an embodiment of the present application.

[0055] like Figure 3 As shown, the piston 2 includes a plug body 21 and a seal 22, wherein a positioning portion is provided on the periphery of the plug body 21, and the seal 22 is sleeved on the positioning portion. By providing the positioning portion on the plug body 21, the degree of fit between the seal 22 and the plug body 21 can be improved, thereby improving the consistency of the structure and the sealing effect.

[0056] Specifically, a plurality of positioning holes 211 are provided on the positioning portion, and the positioning holes 211 are blind holes or through holes. The seal 22 allows part of the material to be embedded into the positioning holes 211 by means of glue injection or installation, so that the seal 22 and the plug body 21 will not easily move relative to each other during installation and use, and the sealing effect between the seal 22 and the plug body 21 is more reliable.

[0057] Furthermore, the positioning holes 211 can be evenly arranged at certain intervals on the positioning portion of the plug body 21 , thereby ensuring the tightness of the connection between the sealing member 22 and various parts of the plug body 21 .

[0058] See also Figure 4-5 , the figure shows the second structure of the piston provided in an embodiment of the present application and its cross-sectional structure.

[0059] like Figure 4-5As shown, the piston 2 includes a plug body 21 and a seal 22, wherein a positioning portion is provided on the periphery of the plug body 21, and the seal 22 is sleeved on the positioning portion. By providing the positioning portion on the plug body 21, the degree of fit between the seal 22 and the plug body 21 can be improved, thereby improving the consistency of the structure and the sealing effect.

[0060] Specifically, a positioning groove 222 is provided on one side of the positioning portion of the plug body 21 close to the center of the plug body 21. The positioning groove 222 is arranged around the plug body 21, and one end of the seal 22 is embedded in the positioning groove 222, so that the seal 22 can be better installed and wrap the plug body 21 inside it, and the seal 22 and the plug body 21 will not easily move relative to each other during installation and use, and the sealing effect between the valve body 1 is more reliable.

[0061] See also Figure 6 , the figure shows the third structure of the piston provided in an embodiment of the present application.

[0062] like Figure 6 As shown, the piston 2 includes a plug body 21 and a seal 22, wherein a positioning portion is provided on the periphery of the plug body 21, and the seal 22 is sleeved on the positioning portion. By providing the positioning portion on the plug body 21, the degree of fit between the seal 22 and the plug body 21 can be improved, thereby improving the consistency of the structure and the sealing effect.

[0063] Specifically, a plurality of positioning holes 211 are provided on the positioning portion of the plug body 21, and the positioning holes 211 are blind holes or through holes. The seal 22 allows part of the material to be embedded into the positioning holes 211 by means of glue injection or installation, so that the seal 22 and the plug body 21 will not easily move relative to each other during installation and use, and the sealing effect between the seal and the valve body 1 is more reliable.

[0064] Furthermore, the positioning holes 211 can be evenly arranged at certain intervals on the positioning portion of the plug body 21 , thereby ensuring the tightness of the connection between the sealing member 22 and various parts of the plug body 21 .

[0065] and Figure 3 The difference is that the seal 22 can be only arranged on one side of the plug body 21 close to the installation position 11, and embedded in the plug body 21 for relative fixation through a number of column structures 223 for positioning, wherein the column structure 223 can be integrally formed with other structures of the seal 22 by means of glue injection, or the seal 22 can be installed on the positioning part of the plug body 21 by using common fixing parts, such as screws or clips as fixing parts, and the present application does not limit this.

[0066] See also Figure 7-8 , the figure shows the fourth structure of the piston provided in an embodiment of the present application and its cross-sectional structure.

[0067] like Figure 7-8 As shown, the piston 2 includes a plug body 21 and a seal 22, wherein a positioning portion is provided on the periphery of the plug body 21, and the seal 22 is sleeved on the positioning portion. By providing the positioning portion on the plug body 21, the degree of fit between the seal 22 and the plug body 21 can be improved, thereby improving the consistency of the structure and the sealing effect.

[0068] Specifically, a positioning groove 222 is provided on one side of the positioning portion of the plug body 21 close to the center of the plug body 21. The positioning groove 222 is arranged in the middle position of the thickness direction of the plug body 21 and is arranged around the plug body 21. One end of the seal 22 is embedded in the positioning groove 222 so that the seal 22 can be better installed at the bottom of the plug body 21, and the seal 22 and the plug body 21 will not easily move relative to each other during installation and use, and the sealing effect between the valve body 1 is more reliable.

[0069] See also Figure 9-10 , the figure shows the structure and cross-sectional structure of the pressure relief valve provided in an embodiment of the present application.

[0070] like Figure 9-10 As shown, the pressure relief valve includes a valve body 1, a piston 2, a guide column 5 and an elastic member 6. The valve body 1 includes a mounting position 11 arranged in the middle, and a through hole 12 is provided at the mounting position 11. The piston 2 is arranged on the mounting position 11, and includes a plug body 21 and a sealing member 22. The sealing member 22 is arranged on the plug body 21 and forms an integral body with the plug body 21. The piston 2 abuts against the mounting position 11 through the sealing member 22, and the through hole 12 is sealed. One end of the guide column 5 is connected to the piston 2 through the through hole 12. An opening is provided on the inner side of the guide column 5, and a gas permeable channel 23 is formed with the membrane material 3. The elastic member 6 is arranged between the guide column 5 and the valve body 1, and is used to control the piston 2 to open at pressure relief or close at normal pressure.

[0071] Wherein, a sealing mechanism as described in any of the above embodiments is formed between the valve body 1 and the piston 2.

[0072] Specifically, the seal 22 can be made of rubber or other soft materials commonly used for structural sealing. The plug body 21 can be a structure with a circular cross section. The plug body 21 can abut against the installation position 11 through the seal 22, and the seal between the inside and outside of the piston 2 is achieved by the abutment between the seal 22 and the installation position 11. The elastic member 6 can be a spring, and the return ability of the elastic member 6 enables the piston 2 to abut against the installation position 11 under normal pressure, and can overcome the return force of the spring to move away from the valve body 1 when the pressure is greater than a certain level.

[0073] In one embodiment, the middle of the plug body 21 may be provided with an opening 23 and a waterproof and breathable membrane 3 covering the opening 23, so that the opposite sides of the piston 2 can be breathable through the membrane 3. Of course, the middle of the plug body 21 may be provided with an opening 23 and a membrane 3, or may not be provided, which can be adjusted according to the actual needs of customers.

[0074] The membrane material 3 may be e-PTFE or other membrane materials that are waterproof and breathable. In one embodiment, the membrane material 3 may be fixed to the piston 2 via a pressure ring 4. The membrane material 3 is directly or indirectly connected to the valve body 1. The specific installation method may be determined according to the actual situation.

[0075] In one embodiment, during installation, the plug body 21 may be firstly injected with glue or installed with rubber coating to form a piston 2 integrated with the seal 22, and then the piston 2 is placed in the installation position 11 of the valve body 1, and the elastic member 6 is sleeved on the outside of the guide column 5, and one end of the guide column 5 is passed through the installation position 11 from the other side of the installation position 11 relative to the piston 2 to be installed with the piston 2, at which time the elastic member 6 abuts against the installation position 11 of the valve body 1, thereby completing the installation process of the pressure relief valve. It can be seen that by integrating the seal 22 with the plug body 21, it is possible to avoid the situation where the seal 22 falls out during the installation process or after long-term use, causing sealing failure, thereby improving the sealing reliability of the pressure relief valve.

[0076] Under normal pressure, the piston 2 is pulled by the elastic member 6, and the sealing member 22 on the piston 2 abuts and seals against the mounting position 11 of the valve body 1. At this time, the piston 2 and the valve body 1 are in a closed state, and the membrane material 3 and the opening 23 of the plug body 21 form a breathable channel, which can achieve waterproof and breathable functions. When the air pressure inside the box where the pressure relief valve is installed suddenly increases and exceeds the preset air pressure value, the piston 2 is pushed open by the air pressure and moves away from the valve body 1, thereby forming a pressure relief channel. At this time, the pressure relief valve quickly releases the air pressure inside the box through the pressure relief channel to ensure the safety of the box and avoid equipment damage or even explosion due to excessive internal air pressure.

[0077] See also Fig.11 , the figure shows the cross-sectional structure of the power equipment provided in an embodiment of the present application.

[0078] Among them, the power equipment 100 includes a shell structure 10 and a pressure relief valve 20. The shell structure 10 can be used to accommodate power batteries or other flammable and explosive power sources or various components. The pressure relief valve 20 is arranged on the shell structure 10, and the pressure relief valve 20 can be a pressure relief valve 20 including a ejector pin structure as in any of the above embodiments.

[0079] Among them, when a power battery is contained in the power device 100, the power battery can be a lithium battery, a sodium ion battery, a fuel cell, etc., and the type of the power battery is not limited. The shell structure 10 can be a box structure, and a variety of different structural methods such as metal and non-metal can be adopted, as long as it can be used to protect and support the structure of internal devices or components. Of course, in addition to the shell structure 10, the power device 100 can also adopt other structures, such as a protection circuit for battery overvoltage / overcurrent protection, a starting circuit, a cable, etc., and the specific submodules included in the power device 100 are not limited in this application.

[0080] It can be seen that when the power equipment 100 of the present application is adopted, the seal of the pressure relief valve 20 can form a whole with the plug body. By integrating the seal onto the piston, the problem of valve body sealing failure caused by assembly errors or seal displacement during the production process can be avoided, thereby improving the sealing reliability of the power equipment 100.

[0081] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0082] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0083] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0084] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0085] The above contents are merely examples and explanations of the structure of the present application, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present application, and these obvious replacement forms all belong to the protection scope of the present application.

Claims

1. A sealing mechanism of a valve body, characterized in that: include: The valve body comprises a mounting position arranged in the middle, wherein a through hole is provided at the mounting position; and The piston is arranged on the installation position and comprises a plug body and a sealing member. The sealing member is arranged on the plug body and forms an integral body with the plug body. The piston abuts against the installation position through the sealing member and seals the through hole.

2. The sealing mechanism of the valve body according to claim 1, characterized in that: The middle part of the plug body is provided with an opening and a waterproof and breathable membrane covering the opening, so that the opposite sides of the piston can be breathable through the membrane.

3. The sealing mechanism of the valve body according to claim 1, characterized in that: A positioning portion is provided on the periphery of the plug body, and the sealing member is sleeved on the positioning portion.

4. The sealing mechanism of the valve body according to claim 3, characterized in that: The sealing member extends from one side where the positioning portion is connected to the mounting position to the other side, so that the positioning portion is wrapped inside by the sealing member.

5. The sealing mechanism of the valve body according to claim 3, characterized in that: The positioning portion is provided with a positioning groove or a positioning hole, and the sealing member is embedded in the positioning groove or the positioning hole for fixation.

6. The sealing mechanism of the valve body according to claim 5, characterized in that: The positioning portion is provided with a positioning groove, and the positioning groove is arranged in the middle position of the plug body in the thickness direction and is arranged around the plug body; or The positioning portion is provided with a positioning groove, and the positioning groove is arranged on a side of the positioning portion of the plug body close to the center of the plug body; or The positioning portion is provided with a plurality of positioning holes, and the positioning holes are arranged at intervals on the positioning portion.

7. The sealing mechanism of the valve body according to claim 1, characterized in that: A positioning portion is provided on the periphery of the plug body, and the sealing member is fixed on the positioning portion via a fixing member.

8. The sealing mechanism of the valve body according to any one of claims 1 to 7, characterized in that: The sealing component is integrally formed with the plug body through a rubber encapsulation process.

9. The sealing mechanism of the valve body according to any one of claims 1 to 7, characterized in that: The sealing member comprises a raised portion, and the sealing member is arranged around the periphery of the plug body and abuts against the installation position through the raised portion.

10. A pressure relief valve, characterized in that: include: The valve body comprises a mounting position arranged in the middle, wherein a through hole is provided at the mounting position; The piston is arranged on the installation position, and comprises a plug body and a sealing member. The sealing member is arranged on the plug body and forms an integral body with the plug body. The piston abuts against the installation position through the sealing member and seals the through hole. The middle part of the plug body is provided with a membrane material for making the valve body waterproof and breathable. A guide column, one end of which is connected to the piston through the through hole, an opening is provided on the inner side of the guide column, and forms a ventilation channel with the membrane material; as well as An elastic member, disposed between the guide column and the valve body, for controlling the piston to open under pressure or close under normal pressure; Wherein, a sealing mechanism as described in any one of claims 1-9 is formed between the valve body and the piston.

11. The pressure relief valve according to claim 10, characterized in that The pressure relief valve further comprises a valve cover, which is mounted on the valve body and covers the piston inside the valve cover.

12. A power device, characterized in that: The power equipment includes: a housing structure; and A pressure relief valve is arranged on the housing structure, and the pressure relief valve includes a sealing mechanism of the valve body as described in any one of claims 1-9, or the pressure relief valve is a pressure relief valve as described in any one of claims 10-11.

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