A pressure relief structure capable of stable pressure relief and self-resetting

Abstract

The application relates to a stable pressure relief self-resetting pressure relief structure arranged on a shell, which comprises a front cover, a movable piece and an elastic element, the front cover is fixedly installed on the shell, a sliding hole is arranged on the front cover, the movable piece penetrates through the sliding hole and can slide along the axial direction of the movable piece, the size of the two ends of the movable piece is larger than the radial size of the sliding hole, the elastic element is arranged along the axial direction of the movable piece, one end of the elastic element is in abutting fit with the front cover, the other end of the elastic element is in abutting fit with one end of the movable piece, the elastic element is linked with the movable piece, the front cover is further provided with an exhaust hole and a pressure relief hole which are in communication with the inside and outside of the shell, when the movable piece is in a natural state, one end of the movable piece closes the pressure relief hole, when the movable piece moves axially, the pressure relief hole is opened. The application can automatically relieve pressure when the pressure is high, can automatically reset when the pressure is reduced, can keep a relatively stable pressure state in the shell, has high reliability, good stability and is not prone to failure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of safety devices, in particular to a pressure-stable self-resetting pressure relief structure. BACKGROUND

[0002] The pressure relief methods of the fire extinguishing devices on the market at present are mostly metal diaphragm slotting or plastic stickers, but the metal diaphragm cannot guarantee successful pressure relief every time due to the influence of slotting precision, and the spray intensity cannot be kept stable. The plastic stickers are easy to break, resulting in failure of the pressure relief function.

[0003] In view of the above situation, it is necessary to design a structure that can keep stable pressure and ensure that the pressure relief function does not fail. SUMMARY

[0004] Based on the above description, the present application provides a pressure-stable self-resetting pressure relief structure to solve the problem of unstable pressure relief or easy pressure relief failure of the current fire extinguishing device.

[0005] The technical scheme for solving the above technical problem is as follows: a pressure-stable self-resetting pressure relief structure is arranged on a shell and comprises a front cover, a movable piece and an elastic element. The front cover is fixedly installed on the shell, and a sliding hole is arranged on the front cover. The movable piece penetrates through the sliding hole and can slide along the axial direction of the movable piece. The size of the two ends of the movable piece is greater than the radial size of the sliding hole. The elastic element is arranged along the axial direction of the movable piece, one end of the elastic element is in abutting cooperation with the front cover, the other end of the elastic element is in abutting cooperation with one end of the movable piece, and the elastic element is linked with the movable piece. An exhaust hole and a pressure relief hole that communicate between the inside and outside of the shell are further arranged on the front cover. When the movable piece is in a natural state, one end of the movable piece closes the pressure relief hole. When the movable piece moves axially, the pressure relief hole is opened.

[0006] Compared with the prior art, the technical scheme of the present application has the following beneficial technical effects: the structure of the present application can be arranged on a shell for containing pressure-variable gas, and serves as a pressure relief switch of the shell. When the gas pressure in the shell is small, the gas is exhausted through the exhaust hole. When the gas pressure in the shell rapidly increases, the pressure of the gas on the movable piece is greater than the elastic force of the elastic element, the movable piece is pushed to move axially to release the pressure relief hole, at this time the elastic element is compressed synchronously, and the pressure relief hole releases the gas in the shell. When the gas pressure in the shell decreases to below the elastic force of the elastic element, the elastic element is stretched, the movable piece is pulled to reset, and the pressure relief hole is closed again. Under the cooperation of the movable piece and the elastic element, the structure can automatically relieve the pressure of the shell when the pressure is high, and can automatically reset when the pressure decreases, so that the pressure in the shell remains stable, the reliability is strong, the stability is good, and the structure is not easy to fail.

[0007] On the basis of the above technical solutions, the application can also be improved as follows.

[0008] Preferably, the movable part comprises a hole sealing plate, a sliding shaft and a limiting plate which are fixedly connected in sequence, the hole sealing plate is arranged vertically to the sliding shaft, and the position of the hole sealing plate corresponds to the pressure relief hole; the sliding shaft penetrates through the sliding hole, the elastic element is arranged in the housing along the axial direction of the sliding shaft, one end of the elastic element is in abutting engagement with the front cover, and the other end of the elastic element is in abutting engagement with the limiting plate; when the elastic element is in a natural state, the hole sealing plate closes the pressure relief hole.

[0009] After the above technical solution is adopted, the hole sealing plate is in abutting engagement with the pressure relief hole in a natural state, so that the pressure relief hole is closed. The sliding shaft provides structural support and guidance for the axial movement of the movable part, the length of the sliding shaft limits the axial movement range of the movable part, and the limiting plate in combination with the elastic element is used for positioning the movable part, so that the movable part drives the hole sealing plate to open and close the pressure relief hole under the action of air pressure and elastic force.

[0010] Preferably, the elastic element is a compression spring which is sleeved on the outer periphery of the sliding shaft.

[0011] After the above technical solution is adopted, when the pressure in the housing is normal, the two ends of the compression spring are slightly compressed between the inner wall of the front cover and the limiting plate, and the limiting plate is pushed away from the front cover due to the elastic force of the compression spring, so that the hole sealing plate is in abutting engagement with the outer wall of the front cover and the pressure relief hole is closed. Since the compression spring is arranged along the axial direction of the sliding shaft, the elastic force direction of the compression spring is consistent with the axial direction of the sliding shaft, so that the sliding of the sliding shaft is smoother.

[0012] Preferably, a guide sleeve coaxial with the sliding shaft is arranged on the side of the front cover facing the housing, the sliding shaft penetrates through the guide sleeve and is in sliding engagement with the guide sleeve.

[0013] After the above technical solution is adopted, the guide sleeve can prolong the guiding distance of the front cover to the sliding shaft, prevent the spool from being skewed during axial sliding, and also facilitate the resetting of the hole sealing plate driven by the sliding shaft after pressure relief.

[0014] Preferably, a guide groove is arranged on the guide sleeve and arranged along the sliding direction of the sliding shaft, a pin is arranged on the sliding shaft and arranged in the radial direction, and the pin is arranged in the guide groove and can slide in the guide groove.

[0015] After the above technical solution is adopted, the guide groove on the guide sleeve and the pin on the sliding shaft cooperate with each other, and the pin slides in the guide groove during the axial sliding of the sliding shaft, so that the sliding shaft is better guided.

[0016] Preferably, the guide groove is a double helical groove coaxially arranged with the sliding shaft, and the helical direction of the double helical groove is arranged along the circumferential direction of the sliding shaft.

[0017] After the above technical scheme is adopted, the helical groove enables the sliding shaft to rotate circumferentially synchronously during axial movement, and the double helical groove cooperates with the two pins respectively, thereby increasing the guiding reliability of the axial sliding of the sliding shaft and reducing the shaking of the sealing plate caused by the elastic force of the elastic element when the device does not need to be depressurized, so that the device is more stable.

[0018] Preferably, the sealing plate is radially provided with a relief groove, the sealing plate closes the pressure relief hole when the sealing plate is in the initial position, and the relief groove tends to correspond to the pressure relief hole when the sealing plate tends to move away from the front cover.

[0019] After the above technical scheme is adopted, the relief groove is staggered with the pressure relief hole of the front cover in the state of not being depressurized, and the pressure relief hole is closed by the blocking part of the sealing plate; during the process of being depressurized, the pressure relief hole is opened along with the axial movement and circumferential rotation of the sliding shaft, and the relief groove gradually approaches the pressure relief hole and finally overlaps the pressure relief hole along with the circumferential rotation of the sliding shaft, so that the discharged gas is sprayed out through the relief groove, the discharged gas is prevented from being blocked by the sealing plate, and the depressurization effect is weakened.

[0020] Preferably, a sunken step is arranged on the side of the front cover facing the outside of the shell, the pressure relief hole and the sliding hole are arranged in the sunken step, and the radial dimension of the sunken step is greater than the radial dimension of the sealing plate; when the sealing plate is in the initial position, the sealing plate is embedded in the sunken step.

[0021] After the above technical scheme is adopted, the sunken step provides a mounting position for the sealing plate, and the pressure relief hole is arranged in the sunken step, so that the sealing plate can be sunken in the sunken step when not needing to be depressurized, and the pressure relief hole can be more accurately closed. In addition, the design of the sunken step can reduce the height of the depressurization structure on the outer surface of the shell, which is conducive to the miniaturization of the device and reduces the possibility of interference with other structures outside the shell.

[0022] Preferably, the height dimension of the sunken step is not less than the thickness dimension of the sealing plate.

[0023] After the above technical scheme is adopted, the thickness of the sealing plate can be greater than or equal to the height of the sunken step, so that the sealing plate can be completely sunken in the sunken step, and the external dimension of the shell does not change greatly when not needing to be depressurized. This setting is conducive to the miniaturization of the device and reduces the possibility of interference with other structures outside the shell, and also takes into account the aesthetics of the outside of the shell.

[0024] Preferably, the front cover is provided with a plurality of exhaust holes, and the plurality of exhaust holes are uniformly arranged in a circumferential array on the outer periphery of the movable member.

[0025] After the above technical scheme is adopted, the beneficial effects are as follows: the plurality of exhaust holes are uniformly distributed in a circumferential array on the movable member of the pressure relief structure, so that the air pressure acting on the movable member in the circumferential direction is relatively uniform, and when the movable member is pushed to move axially to achieve pressure relief, the movable member can move more smoothly, and the shaking of the movable member during movement is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A top view angle explosion structure schematic diagram of the pressure relief structure with stable pressure and self-resetting provided by the embodiment of the present application is provided.

[0027] Figure 2 A bottom view angle explosion structure schematic diagram of the movable member and the front cover provided by the embodiment of the present application is provided.

[0028] Figure 3 A sectional view of the pressure relief structure in a natural state provided by the embodiment of the present application is provided.

[0029] Figure 4 A sectional view of the pressure relief structure in a pressure relief state provided by the embodiment of the present application is provided.

[0030] Figure 5 (a) A bottom state change process schematic diagram of the pressure relief structure in a pressure relief process provided by the embodiment of the present application. Figure 5 (b) A top state change process schematic diagram of the pressure relief structure in a pressure relief process provided by the embodiment of the present application.

[0031] In the drawings, the components represented by the respective reference numerals are listed as follows:

[0032] 1, shell, 2, front cover, 201, sliding hole, 202, exhaust hole, 203, pressure relief hole, 204, sunken step, 205, guide sleeve, 2051, guide groove, 3, movable member, 301, hole sealing plate, 3011, avoiding groove, 302, sliding shaft, 3021, pin, 303, limiting plate, 4, elastic element. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the related drawings. The embodiments of the present application are shown in the drawings. However, the present application can be realized 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 thorough and comprehensive.

[0034] Unless otherwise defined, 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 application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0035] It is to be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device described is turned over in use, a relative prefiix term such as "lower", "bottom", "under", "underneath", "below", "upper", "top", "above", "over", or some other related terms could be used to describe the orientation of an element or feature when it was actually further from rather than closer to the base. These terms are intended to encompass the various

[0036] It is to be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device described is turned over in use, a relative prefiix term such as "lower", "bottom", "under", "underneath", "below", "upper", "top", "above", "over", or some other related terms could be used to describe the orientation of an element or feature when it was actually further from rather than closer to the base. These terms are intended to encompass the various

[0037] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It is to be understood that the terms "comprise / comprising", "have / having" or "include / including" or any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0038] Referring to Figures 1-4 As Figure 1 A top view of an explosion structure of a stable voltage self-resetting pressure relief structure provided by an embodiment of the application is shown in the figure. Figure 2 A bottom view of an explosion structure of a movable part 3 and a front cover 2 provided by an embodiment of the application is shown in the figure. Figure 3 A sectional view of a stable voltage self-resetting pressure relief structure in a natural state provided by an embodiment of the application is shown in the figure. Figure 4 A sectional view of a stable voltage self-resetting pressure relief structure in a pressure relief state provided by an embodiment of the application is shown in the figure.

[0039] As Figures 1-4As shown, the embodiment provides a stable pressure self-resetting pressure relief structure, which is arranged on the shell 1 and communicates between the inside and outside of the shell 1. The structure comprises a front cover 2, a movable element 3 and an elastic element 4. The front cover 2 is fixedly installed on the shell 1, and a sliding hole 201 is arranged on the front cover 2. The movable element 3 penetrates through the sliding hole 201 and can slide along the axial direction of the movable element 3. The size of the two ends of the movable element 3 is greater than the radial size of the sliding hole 201. The elastic element 4 is arranged along the axial direction of the movable element 3. One end of the elastic element 4 is in abutting cooperation with the front cover 2, and the other end is in abutting cooperation with one end of the movable element 3. The elastic element 4 is linked with the movable element 3. The front cover 2 is further provided with an exhaust hole 202 and a pressure relief hole 203, which communicate between the inside and outside of the shell 1. When the movable element 3 is in a natural state, one end of the movable element 3 closes the pressure relief hole 203. When the movable element 3 moves axially, the pressure relief hole 203 is opened.

[0040] It can be understood that, in order to overcome the problems pointed out in the background art, the embodiment of the present application provides a stable pressure self-resetting pressure relief structure. The structure can be arranged on the shell 1 for containing pressure variable gas, and is used as a pressure relief switch of the shell 1. When the gas pressure in the shell 1 is low, the pressure relief structure is in a natural state, and the shell 1 is exhausted through the exhaust hole 202. When the gas pressure in the shell 1 rapidly increases, for example, a large amount of gas is generated by the detonation of gunpowder in the shell 1, and the pressure of the gas in the shell 1 increases to be greater than the elastic force of the elastic element 4 for a short time, the gas pressure drives the movable element 3 to move axially to release the pressure relief hole 203, at this time the elastic element 4 is compressed synchronously, and the pressure relief hole 203 releases the gas in the shell 1, thereby achieving pressure relief. When the gas pressure in the shell 1 decreases to be below the elastic force of the elastic element 4, the elastic element 4 is stretched, pulls the movable element 3 to reset, and again closes the pressure relief hole 203. The critical value of the gas pressure for pressure relief is determined by the elastic force of the elastic element 4, so corresponding elastic elements 4 can be used according to the actual need of the product to stabilize the pressure value. Under the cooperation of the movable element 3 and the elastic element 4, the structure can automatically relieve the pressure of the shell 1 when the pressure is high, and can automatically reset when the pressure decreases, so that the pressure in the shell 1 remains relatively stable. The reliability is strong, the stability is good, and the structure is not easy to fail and can be repeatedly used.

[0041] On the basis of the above technical solution, the embodiment can also be improved as follows.

[0042] As Figures 1-4As shown, the movable element 3 comprises, in sequence, a sealing plate 301, a sliding shaft 302 and a limiting plate 303, the sealing plate 301 is arranged perpendicularly to the sliding shaft 302, and the position of the sealing plate 301 corresponds to the pressure relief hole 203; the sliding shaft 302 penetrates the sliding hole 201, the elastic element 4 is arranged along the axial direction of the sliding shaft 302 in the shell 1, one end of the elastic element 4 abuts against the front cover 2, and the other end of the elastic element 4 abuts against the limiting plate 303; when the elastic element 4 is in a natural state, the sealing plate 301 closes the pressure relief hole 203.

[0043] It can be understood that, in a natural state, i.e. when the pressure in the shell 1 is normal, the sealing plate 301 is attached to the pressure relief hole 203, thereby closing the pressure relief hole 203. The sliding shaft 302 provides structural support and guidance for the axial movement of the movable element 3, the length of the sliding shaft 302 limits the axial movement range of the movable element 3, and the limiting plate 303 in combination with the elastic element 4 provides positioning for the movable element 3, so that the movable element 3 drives the sealing plate 301 to open and close the pressure relief hole 203 under the action of air pressure and elastic force.

[0044] As shown in the figure, Figures 1-4 The elastic element 4 is a compression spring, such as a spiral spring or other types of extendable spring, which is arranged on the outer periphery of the sliding shaft 302. The embodiment of the present application is exemplified by a spiral spring.

[0045] It can be understood that, when the pressure in the shell 1 is normal, the two ends of the compression spring are slightly compressed between the inner wall of the front cover 2 and the limiting plate 303. Due to the elastic force of the compression spring, the limiting plate 303 is pushed away from the front cover 2, and the limiting plate 303 pulls the sealing plate 301 to move through the sliding shaft 302, so that the sealing plate 301 abuts against the outer wall of the front cover 2 and closes the pressure relief hole 203. Since the compression spring is arranged along the axial direction of the sliding shaft 302, the direction of the elastic force of the compression spring is consistent with the axial direction of the sliding shaft 302, so that the sliding shaft 302 slides more smoothly.

[0046] As shown in the figure, Figure 2 The front cover 2 is provided with a guide sleeve 205 coaxial with the sliding shaft 302 on the side facing the shell 1, and the sliding shaft 302 penetrates the guide sleeve 205 and is in sliding fit with the guide sleeve 205.

[0047] It can be understood that the guide sleeve 205 can prolong the guiding distance of the front cover 2 to the sliding shaft 302, prevent the spool from skewing when sliding along the axial direction, and also facilitate the resetting of the sealing plate 301 driven by the sliding shaft 302 after pressure relief.

[0048] As shown in the figure, Figure 2As shown, the guide sleeve 205 is provided with a guide groove 2051 arranged along the sliding direction of the sliding shaft 302, and the sliding shaft 302 is provided with a pin 3021 arranged along the radial direction, which is arranged in the guide groove 2051 and can slide along the guide groove 2051.

[0049] It can be understood that the guide groove 2051 on the guide sleeve 205 cooperates with the pin 3021 on the sliding shaft 302, and the pin 3021 slides in the guide groove 2051 during the axial sliding of the sliding shaft 302, which can better guide the sliding shaft 302.

[0050] As shown in Figure 2 , the guide groove 2051 is a double helical groove coaxially arranged with the sliding shaft 302, and the helical direction of the double helical groove is arranged along the circumference of the sliding shaft 302.

[0051] It can be understood that the pin 3021 slides along the helical groove, and the helical groove enables the sliding shaft 302 to rotate synchronously in the circumferential direction (i.e. helical motion) during the axial movement, and one pin 3021 is arranged in each helical groove, and the double helical grooves cooperate with the two pins 3021 respectively, which can increase the guiding reliability of the axial sliding of the sliding shaft 302, and also can reduce the shaking of the hole sealing plate 301 caused by the elastic force of the elastic element 4 when the device does not need to be relieved, so that the device is more stable.

[0052] As shown in Figure 1 and Figure 2 , the hole sealing plate 301 is provided with an avoiding groove 3011 in the radial direction, and when the hole sealing plate 301 is in the initial position, the hole sealing plate 301 closes the pressure relief hole 203; when the hole sealing plate 301 tends to move away from the front cover 2, the avoiding groove 3011 tends to correspond to the pressure relief hole 203.

[0053] It can be understood that in the state of not relieving pressure, the avoiding groove 3011 is staggered with the pressure relief hole 203 of the front cover 2, and the pressure relief hole 203 is closed by the blocking part of the hole sealing plate 301; during the relieving process, with the axial movement and circumferential rotation of the sliding shaft 302, the pressure relief hole 203 is opened, and at the same time, with the circumferential rotation of the sliding shaft 302, the avoiding groove 3011 gradually approaches the pressure relief hole 203 and finally overlaps with the pressure relief hole 203, so that the discharged gas is sprayed out through the avoiding groove 3011, avoiding the hole sealing plate 301 blocking the sprayed gas, and weakening the pressure relief effect.

[0054] As shown in Figure 1As shown, the front cover 2 is provided with a sunken step 204 on the side facing outwards of the shell 1, and the pressure relief hole 203 and the sliding hole 201 are arranged in the sunken step 204, and the radial dimension of the sunken step 204 is greater than the radial dimension of the sealing plate 301; when the sealing plate 301 is in the initial position, the sealing plate 301 is embedded in the sunken step 204.

[0055] It can be understood that the sunken step 204 provides a mounting position for the sealing plate 301, and the pressure relief hole 203 is arranged in the sunken step 204. When pressure relief is not needed, the sealing plate 301 is sunken into the sunken step 204, and the pressure relief hole 203 can be more accurately closed. The design of the sunken step 204 can reduce the height of the pressure relief structure of the present application on the outer surface of the shell 1, which is beneficial to the miniaturization of the device and reduces the possibility of interference with other structures outside the shell 1.

[0056] As shown in Figure 3 and Figure 4 , the height dimension of the sunken step 204 is not less than the thickness dimension of the sealing plate 301.

[0057] It can be understood that the thickness of the sealing plate 301 can be greater than the height of the sunken step 204, or can be equal to the height of the sunken step 204, so that the sealing plate 301 can be completely sunken into the sunken step 204. When pressure relief is not needed, the outer dimension of the shell 1 does not change much, which is beneficial to the miniaturization of the device and reduces the possibility of interference with other structures outside the shell 1, and also takes into account the aesthetics of the outside of the shell 1.

[0058] As shown in Figure 1 and Figure 2 , the front cover 2 is provided with a plurality of exhaust holes 202, and the plurality of exhaust holes 202 are uniformly arranged in a circumferential array on the outer periphery of the movable part 3.

[0059] It can be understood that the plurality of exhaust holes 202 are uniformly distributed in a circumferential array on the movable part 3 of the pressure relief structure, so that the air pressure received by the movable part 3 in the circumferential direction is more uniform, and when the movable part 3 is pushed to move axially to achieve pressure relief, the movable part 3 can move more smoothly, and the shaking of the movable part 3 during movement is reduced.

[0060] Now, in combination with Figure 5 (a) and Figure 5 (b), the movement process of the movable part 3 relative to the front cover 2 during pressure relief will be described. Among them, Figure 5 (a) is a schematic diagram of the bottom state change process of the pressure relief structure during pressure relief provided in the embodiment, Figure 5 (b) is a schematic diagram of the top state change process of the pressure relief structure during pressure relief provided in the embodiment. As Figure 5(a) shown, when the shell 1 in the air pressure is too large, need to be pressure relief, air pressure through the pressure relief hole 203 push the sealing plate 301, the compression spring is compressed, in the pin 3021 and the double helix groove cooperation, sliding shaft 302 drive the whole movable piece 3 spiral motion, until the sliding shaft 302 axial limit position, limit plate 303 and the end of the guide sleeve 205 abutting, this process will release the pressure relief hole 203, through the pressure relief hole 203 and exhaust hole 202 together for shell 1 pressure relief. As Figure 5 (a) shown, in the process of the movable piece 3 spiral motion release the pressure relief hole 203, the avoidance groove 3011 with sealing plate 301 gradually rotate and eventually with the pressure relief hole 203 alignment, will release the pressure relief hole 203 completely, prevent the gas from the pressure relief hole 203 spout is blocked by the sealing plate 301 so as to reduce the pressure relief effect.

[0061] The present application provides a kind of pressure relief structure of stable pressure self-resetting, it can be arranged in the shell 1 for containing variable pressure gas, it is used as the pressure relief switch of shell 1.In the shell 1 in the air pressure is small, pressure relief structure is in natural state, shell 1 is discharged through exhaust hole 202;When the air pressure in shell 1 increases rapidly, for example, shell 1 in gunpowder point explosion produces a large amount of gas, the pressure of gas in shell 1 to movable piece 3 increases to greater than the elastic force of elastic element 4 for a short time, air pressure promotes movable piece 3 to release pressure relief hole 203 and carry out spiral motion, at this time, elastic element 4 is compressed synchronously, pressure relief hole 203 releases the gas in shell 1, to realize pressure relief.In the process of pressure relief, movable piece 3 rotates gradually and avoids groove 3011 with pressure relief hole 203 alignment, to provide better pressure relief effect.When the air pressure in shell 1 decreases to the elastic force of elastic element 4, elastic element 4 stretches, pulls movable piece 3 reset, sealing plate 301 again closes pressure relief hole 203.In the cooperation of movable piece 3 and elastic element 4, the present pressure relief structure can automatically release pressure for shell 1 when pressure is large, can also automatically reset after pressure reduction, so that the pressure in shell 1 remains relatively stable, high reliability, good stability, and not easy to fail, can be repeatedly used.

[0062] The above only for the preferred embodiment of the present application, and not to limit the present application, any modification, equivalent replacement, improvement etc. made within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A pressure-stabilized self-resetting pressure relief structure provided on a housing (1), characterized in that, The utility model provides a kind of front cover (2), movable element (3) and elastic element (4), the front cover (2) is fixedly installed on shell (1), and front cover (2) is equipped with sliding hole (201), the movable element (3) penetrates the sliding hole (201), and can slide along the axial direction of itself, the size of the two ends of the movable element (3) is greater than the radial dimension of the sliding hole (201);The elastic element (4) is arranged along the axial direction of movable element (3), and one end of elastic element (4) is in abutment with front cover (2), and the other end is in abutment with one end of movable element (3), and the elastic element (4) is linked with movable element (3);Front cover (2) is further equipped with exhaust hole (202) and pressure relief hole (203) that communicate inside and outside shell (1), when movable element (3) is in natural state, one end of movable element (3) will close the pressure relief hole (203), when movable element (3) moves axially, the pressure relief hole (203) is opened; The movable element (3) includes sequentially fixedly connected hole sealing plate (301), sliding shaft (302) and limiting plate (303), the hole sealing plate (301) is vertically arranged to the sliding shaft (302), and the position of the hole sealing plate (301) corresponds to the pressure relief hole (203);The sliding shaft (302) penetrates the sliding hole (201), and the elastic element (4) is arranged in the shell (1) along the axial direction of the sliding shaft (302), one end of the elastic element (4) is in abutment with the front cover (2), and the other end of the elastic element (4) is in abutment with the limiting plate (303);When the elastic element (4) is in natural state, the hole sealing plate (301) closes the pressure relief hole (203); The side of the front cover (2) towards the shell (1) is provided with a guide sleeve (205) coaxial with the sliding shaft (302), the sliding shaft (302) penetrates the guide sleeve (205) and is in sliding fit with the guide sleeve (205); The guide sleeve (205) is provided with a guide groove (2051), the guide groove (2051) is arranged along the sliding direction of the sliding shaft (302), the sliding shaft (302) is provided with a pin (3021) arranged along the radial direction, the pin (3021) is arranged in the guide groove (2051) and can slide along the guide groove (2051); The guide groove (2051) is a double helical groove, the double helical groove is coaxially arranged with the sliding shaft (302), and the helical direction of the double helical groove is arranged along the circumferential direction of the sliding shaft (302).

2. The pressure relief structure according to claim 1, wherein The elastic element (4) is a compression spring sleeved on the outer periphery of the sliding shaft (302).

3. The pressure relief structure according to claim 1, wherein The hole sealing plate (301) is provided with an avoiding groove (3011) in the radial direction, when the hole sealing plate (301) is in the initial position, the hole sealing plate (301) closes the pressure relief hole (203), when the hole sealing plate (301) tends to move away from the front cover (2), the avoiding groove (3011) tends to correspond to the pressure relief hole (203).

4. The pressure relief structure according to claim 1, wherein The front cover (2) is provided with a sunken step (204) on the side facing outside the shell (1), the pressure relief hole (203) and the sliding hole (201) are arranged in the sunken step (204), and the radial dimension of the sunken step (204) is greater than the radial dimension of the hole sealing plate (301); when the hole sealing plate (301) is in the initial position, the hole sealing plate (301) is embedded in the sunken step (204).

5. The pressure relief structure according to claim 4, wherein The height dimension of the sunken step (204) is not less than the thickness dimension of the hole sealing plate (301).

6. The pressure relief structure according to claim 1, wherein The front cover (2) is provided with a plurality of exhaust holes (202), and the plurality of exhaust holes (202) are uniformly arranged in a circumferential array on the outer periphery of the movable element (3).

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