Safety valve for protecting micro-pressure equipment and micro-pressure equipment

Abstract

The present application provides a safety valve for protecting a micro-pressure device and a micro-pressure device, relating to the technical field of storage. The safety valve includes a valve body, a valve core, a driving component, and a reset component. The valve body is provided with a pressure relief hole and a first sealing portion; the valve core is provided with a second sealing portion and a ventilation hole. The valve core is used to switch between a first position and a second position. When in the first position, the first sealing portion and the second sealing portion are attached to close the pressure relief hole. When in the second position, the first sealing portion and the second sealing portion are separated to open the pressure relief hole. The driving component includes a housing, a diaphragm, and a transmission member. The housing is connected to the valve body. The effective surface area of the diaphragm is larger than the effective surface area of the first sealing portion. The diaphragm is arranged in the housing and divides the housing into a mutually independent first chamber and a second chamber. The first chamber is communicated with the ventilation hole; the transmission member is connected to the diaphragm and the valve core at the same time. The reset component is connected to the housing, and the reset component is used to make the valve core have a tendency to move from the second position to the first position. It has high sensitivity and good sealing performance.

Description

Technical Field

[0001] The present invention relates to the technical field of storage, and in particular, to a safety valve for protecting a micro-pressure device and a micro-pressure device. Background Art

[0002] In micro-pressure gas devices or systems such as vacuum glove boxes and inert gas protection boxes, it is usually necessary to evacuate the air inside the device and fill it with inert gas. The filling pressure of the inert gas is generally slightly higher than the atmospheric pressure, and the maximum working pressure of the device or system is usually ≤ 800 Pa. During the process of filling the inert gas, if the operation is improper, it may cause the filling gas pressure to exceed the maximum working pressure of the device. To protect the normal operation of the device, it is usually necessary to install a safety valve on the device so that the overpressure gas can be accurately and automatically discharged. To avoid the leakage of the inert gas with normal pressure in the device after the overpressure gas is discharged, it is required that the safety valve can achieve tight sealing within a relatively low opening and closing range. At present, due to structural limitations, the safety valves of the prior art cannot meet the overpressure safety discharge of micro-pressure gas below 1 Kpa. Generally, a single check valve is used on such devices for overpressure discharge, and the single check valve sets the exhalation pressure by adjusting the weight of its own valve flap, with poor sealing performance, or requires a large opening and closing pressure difference to achieve good sealing, and the inert gas filled in the device is likely to leak, which is not conducive to the normal operation of the device. Summary of the Invention

[0003] The purpose of the present invention is to provide a safety valve for protecting a micro-pressure device and a micro-pressure device, which can achieve the overpressure safety discharge of micro-pressure gas on the premise of meeting the internal pressure of the micro-pressure device below 1 Kpa, and can achieve tight sealing within a range of ≥ 90% of the set pressure.

[0004] The embodiments of the present invention are implemented as follows:

[0005] In a first aspect, the present invention provides a safety valve for protecting a micro-pressure device, including:

[0006] a valve body, a valve core, a driving component, and a reset component;

[0007] The valve body is provided with a pressure relief hole and a first sealing portion; the valve core is provided with a second sealing portion and a vent hole for communicating with the inner cavity of the micro-pressure device. The valve core is movably connected to the valve body and is used to switch between a first position and a second position. When in the first position, the first sealing portion and the second sealing portion are attached to close the pressure relief hole. When in the second position, the first sealing portion and the second sealing portion are separated to open the pressure relief hole;

[0008] The driving component includes a housing, a diaphragm, and a transmission member. The housing is connected to the valve body. The effective surface area of the diaphragm is larger than that of the first sealing portion. The diaphragm is disposed inside the housing and divides the housing into an independent first chamber and a second chamber. The first chamber communicates with the vent hole. The transmission member is connected to both the diaphragm and the valve core.

[0009] The reset component is connected to the housing and is configured to give the valve core a tendency to move from the second position to the first position.

[0010] In an alternative embodiment, the ratio of the effective surface area of the diaphragm to that of the first sealing portion is set between 10 and 20.

[0011] In an alternative embodiment, the valve body includes a main body and a valve seat. The main body is provided with an air inlet passage and an air outlet passage. The air inlet passage communicates with the vent hole. When in the first position, the air inlet passage is blocked from the air outlet passage. When in the second position, the air inlet passage communicates with the air outlet passage through the pressure relief hole. The pressure relief hole is provided on the valve seat and has a first port and a second port. The first sealing portion is disposed on the end face where the first port is located.

[0012] In an alternative embodiment, the first sealing portion is arranged as an annular convex portion surrounding the port of the pressure relief hole, and the cross-sectional area of the annular convex portion gradually increases in the direction from the first port to the second port.

[0013] In an alternative embodiment, the side surface of the annular convex portion facing away from the first port is arranged as an arc surface for fitting with the second sealing portion.

[0014] In an alternative embodiment, the valve core includes a core body and a sealing gasket. The sealing gasket is connected to the core body. The second sealing portion is disposed on the sealing gasket. The end face where the first port is located is provided with a first limiting portion, and the core body is provided with a second limiting portion. The first limiting portion is configured to abut against the second limiting portion to limit the distance that the sealing gasket moves in the direction close to the annular convex portion.

[0015] In an alternative embodiment, the housing includes a first half-shell and a second half-shell, which are detachably connected. The first half-shell and the diaphragm jointly define the first chamber, and the second half-shell and the diaphragm jointly define the second chamber. The reset component is connected to the second half-shell. The transmission member passes through the first half-shell and is connected to the valve core.

[0016] In an alternative embodiment, the reset assembly includes a base body and an elastic member. The base body is connected to the housing, and the elastic member abuts against both the base body and the diaphragm simultaneously, so as to make the diaphragm tend to move from the second position to the first position.

[0017] In an alternative embodiment, the elastic force of the elastic member is adjustable.

[0018] In a second aspect, the present invention provides a micro-pressure device, which includes:

[0019] A device body and a safety valve for protecting the micro-pressure device according to any one of the foregoing embodiments. The valve body is connected to the device body, and the ventilation hole is communicated with the inner cavity of the device body; when in the first position, the inner cavity is blocked from the pressure relief hole, and when in the second position, the inner cavity is communicated with the pressure relief hole.

[0020] The beneficial effects of the embodiments of the present invention are:

[0021] In summary, the safety valve for protecting the micro-pressure device provided in this embodiment is used in cooperation with the device body. The valve body is assembled to the device body and the inner cavity of the device body is communicated with the ventilation hole. In this way, the inner cavity of the device body is communicated with the first chamber through the ventilation hole, and the pressure in the inner cavity of the device body is equal to the pressure in the first chamber.

[0022] First, adjust the reset assembly to set the set pressure value of the safety valve (i.e., the opening pressure value of the safety valve). When the pressure of the device body is lower than the set pressure value of the safety valve, the upward force of the fluid medium acting on the diaphragm is lower than the downward force of the reset assembly acting on the diaphragm, that is, the external force received by the diaphragm on one side of the first chamber is less than the external force received by the diaphragm on one side of the second chamber. At this time, the valve core is in the first position, and the first sealing portion and the second sealing portion cooperate to close the pressure relief hole together, and the fluid medium in the device body will not be discharged from the pressure relief hole.

[0023] When the pressure of the device body reaches the set pressure value of the safety valve, the upward force of the fluid medium acting on the diaphragm is greater than the downward force of the reset assembly acting on the diaphragm. The diaphragm moves upward and drives the valve core to move upward. The first sealing portion moves away from the second sealing portion, thus releasing the seal of the pressure relief hole, and the pressure relief hole opens to discharge the overpressure gas in the device body. After the overpressure gas is discharged, the pressure in the inner cavity of the device body gradually decreases. When the pressure in the device body decreases to be lower than the set pressure value of the safety valve, the valve core resets under the action of the reset assembly, and the first sealing portion and the second sealing portion cooperate again to seal the pressure relief hole, and achieve a tight seal within a range of ≥ 90% of the set pressure.

[0024] Since the inside of the device body is a micro-pressure gas less than 1 KPa, the valve core of this safety valve only has the function of opening and closing the pressure relief hole. The component that drives the movement of the valve core is a diaphragm. Moreover, the effective surface area of the diaphragm is larger than that of the first sealing part. In this way, the diaphragm can amplify the force of the micro-pressure gas, enabling the reset assembly to flexibly adjust the setting pressure value of the safety valve and amplifying the sealing force of the valve core to achieve a tight seal within a range of ≥90% of the setting pressure. Brief Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0026] Figure 1 Structural schematic diagram of the safety valve for protecting the micro-pressure device according to the embodiment of the present invention;

[0027] Figure 2 is Figure 1 partial enlarged structural schematic diagram in;

[0028] Figure 3 is Figure 2 partial enlarged structural schematic diagram in;

[0029] Figure 4 Partial structural schematic diagram of the valve core according to the embodiment of the present invention.

[0030] Icon:

[0031] 100 - Valve body; 110 - Main body; 111 - Intake passage; 112 - Exhaust passage; 120 - Valve seat; 121 - Pressure relief hole; 122 - First port; 1221 - First limiting part; 123 - Second port; 130 - Sealing element; 140 - First sealing part; 200 - Valve core; 210 - Guide sleeve; 220 - Core body; 221 - Limiting plate part; 222 - Sliding cylinder part; 2221 - Second limiting part; 223 - First ventilation hole; 230 - Sealing gasket; 240 - Pressure plate; 250 - Second sealing part; 300 - Driving assembly; 310 - Housing; 311 - First half shell; 3111 - Second ventilation hole; 3112 - Sliding hole; 312 - Second half shell; 313 - First chamber; 314 - Second chamber; 320 - Diaphragm; 330 - Force - transmitting rod; 340 - First tray; 350 - Second tray; 360 - Nut; 400 - Reset assembly; 410 - Base body; 420 - Base; 430 - Adjusting seat; 431 - Third ventilation hole; 432 - Limiting groove; 440 - Elastic element; 450 - Adjusting rod; 451 - Ball head; 460 - End cover; 461 - Threaded hole; 462 - Fourth ventilation hole; 470 - Protective cover; 471 - Fifth ventilation hole; 480 - Ventilation cover; 481 - Sixth ventilation hole. Detailed implementation mode

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

[0034] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0036] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the prior art, the existing safety valve generally has the upward force of the medium and the downward force of the spring directly acting on the valve core 200, and the valve core 200 is opened and closed by the force applied to the valve core 200. In the protection of micro-pressure equipment, the medium pressure is less than 1KPa, and the force of this micro-pressure acting on the valve core 200 is even less than the weight of the valve core 200 and the other parts connected to the valve core 200. The set pressure value of the safety valve cannot be set. Even if the weight of the parts is reduced as much as possible so that the set pressure value of the safety valve can be adjusted, after the safety valve is closed, the medium pressure in the equipment needs to be reduced a lot to meet the sealing requirements or it cannot achieve a tight seal at all.

[0039] In view of this, the designer designed a safety valve for protecting micro-pressure equipment. A vent hole is provided on the valve core 200 of the safety valve, and the valve core 200 is only used as an opening and closing component. The driving force of the opening and closing action of the safety valve acts on the diaphragm 320. The area of ​​the diaphragm 320 is enlarged after calculation, and then the sealing force of the discharge and closing of the safety valve can be enlarged, which can not only realize sensitive operation, but also can be tightly sealed within ≥90% of the set pressure range of the safety valve.

[0040] See also Figures 1-4, in this embodiment, the safety valve for protecting the micro-pressure device includes a valve body 100, a valve core 200, a driving assembly 300, and a reset assembly 400. The valve body 100 is provided with a pressure relief hole 121 and a first sealing portion 140; the valve core 200 is provided with a second sealing portion 250 and a ventilation hole for communicating with the inner cavity of the micro-pressure device. The valve core 200 is movably connected to the valve body 100 and is used to switch between a first position and a second position. When in the first position, the first sealing portion 140 and the second sealing portion 250 are attached to close the pressure relief hole 121. When in the second position, the first sealing portion 140 is separated from the second sealing portion 250 to open the pressure relief hole 121. The driving assembly 300 includes a housing 310, a diaphragm 320, and a transmission member. The housing 310 is connected to the valve body 100. The effective surface area of the diaphragm 320 is larger than the effective surface area of the first sealing portion 140. The diaphragm 320 is disposed in the housing 310 and divides the housing 310 into mutually independent first and second chambers 313 and 314. The first chamber 313 communicates with the ventilation hole; the transmission member is connected to both the diaphragm 320 and the valve core 200. The reset assembly 400 is connected to the housing 310, and the reset assembly 400 is used to make the valve core 200 have a tendency to move from the second position to the first position.

[0041] Herein, it should be noted that the effective surface area of the first sealing portion 140 refers to the surface area of the portion where the first sealing portion 140 and the second sealing portion 250 are attached when the first sealing portion 140 and the second sealing portion 250 are in the position of closing the pressure relief hole 121. The effective surface area of the diaphragm 320 refers to the area of the surface of the diaphragm 320 on the side of the first chamber 313 that contacts the fluid medium.

[0042] The working principle of the safety valve for protecting the micro-pressure device provided in this embodiment is as follows:

[0043] Fix the safety valve on the equipment body by using its valve body 100, and make the inner cavity of the equipment body communicate with the ventilation hole. In this way, the inner cavity of the equipment body communicates with the first chamber 313 through the ventilation hole, and the pressure in the inner cavity of the equipment body is equal to the pressure in the first chamber 313. Before filling the equipment body with inert gas or the like, first adjust the reset assembly 400 to set the set pressure value of the safety valve, that is, set the opening pressure value of the safety valve by adjusting the reset assembly 400.

[0044] When the device body is inflated, when the pressure of the device body is lower than the set pressure value of the safety valve, the upward force of the fluid medium acting on the diaphragm 320 is lower than the downward force of the reset assembly 400 acting on the diaphragm 320, that is, the external force received by the diaphragm 320 on one side of the first chamber 313 is less than the external force received by the diaphragm 320 on one side of the second chamber 314. At this time, the valve core 200 is in the first position, and the first sealing portion 140 and the second sealing portion 250 cooperate to close the pressure relief hole 121, and the fluid medium in the device body will not be discharged from the pressure relief hole 121. When the pressure of the device body reaches the set pressure value of the safety valve, the upward force of the fluid medium acting on the diaphragm 320 is greater than the downward force of the reset assembly 400 acting on the diaphragm 320. The diaphragm 320 moves upward to drive the valve core 200 to move upward. The first sealing portion 140 moves away from the second sealing portion 250 to release the seal of the pressure relief hole 121, and the pressure relief hole 121 is opened to discharge the overpressure gas in the device body. After the overpressure gas is discharged, the pressure in the inner cavity of the device body gradually decreases. When the pressure in the device body decreases to be lower than the set pressure value of the safety valve, the valve core 200 is reset under the action of the reset assembly 400, and the first sealing portion 140 and the second sealing portion 250 cooperate again to seal the pressure relief hole 121 and achieve a tight seal within the range of ≥90% of the set pressure.

[0045] Since the gas in the device body is a micro-pressure gas less than 1 KPa, the valve core 200 of this safety valve only has the function of opening and closing the pressure relief hole 121, and the component driving the valve core 200 to move is the diaphragm 320. Moreover, the effective surface area of the diaphragm 320 is larger than the effective surface area of the first sealing portion 140. In this way, the diaphragm 320 can amplify the force of the micro-pressure gas, enabling the reset assembly 400 to flexibly adjust the set pressure value of the safety valve and amplifying the sealing force of the valve core 200 to achieve a tight seal within the range of ≥90% of the set pressure.

[0046] In this embodiment, optionally, the ratio of the effective surface area of the diaphragm 320 to the effective surface area of the first sealing portion 140 is set between 10 and 20. Further, the ratio of the effective surface area of the diaphragm 320 to the effective surface of the first sealing portion 140 is set between 15 and 18. In a specific embodiment, the ratio of the effective surface area of the diaphragm 320 to the effective surface of the first sealing portion 140 can be set to 10, 15, 16, or 18, etc., and they are not listed one by one in this embodiment. The ratio of the effective surface area of the diaphragm 320 to the effective surface area of the first sealing portion 140 can be obtained by calculation. For example, the effective surface area of the first sealing portion 140 can be determined first, and then the effective surface area of the diaphragm 320 can be obtained according to the corresponding ratio, and vice versa.

[0047] Please combine Figure 1 and Figure 2In this embodiment, optionally, the valve body 100 includes a main body 110, a valve seat 120 and a sealing member 130. The main body 110 is provided with an inlet channel 111 and an outlet channel 112, and the extension directions of the inlet channel 111 and the outlet channel 112 are perpendicular. For example, in this embodiment, the inlet channel 111 extends along a first axis, and the outlet channel 112 extends along a second axis. For further information, please refer to Figure 1 , taking the perspective in the figure as a reference, the first axis extends vertically and the second axis extends horizontally. A flange structure is provided at the end of the air inlet channel 111 for connecting to the equipment body. A flange structure is provided at the end of the air outlet channel 112 for connecting to a gas collection and processing device, or the end of the air outlet channel 112 is directly exposed to the environment. The valve seat 120 is configured as a hollow structure, and the inner cavity of the valve seat 120 is the pressure relief hole 121. The valve seat 120 has a first port 122 and a second port 123 extending in the length direction thereof, and the valve seat 120 is fixed inside the main body 110, and the second port 123 of the valve seat 120 is connected to the end of the air inlet channel 111 close to the air outlet channel 112. In addition, a seal 130 is provided between the valve seat 120 and the main body 110, and the seal 130 seals the connection position between the air inlet channel 111 and the air outlet channel 112. The valve seat 120 blocks the air inlet channel 111 and the air outlet channel 112, and can connect the air inlet channel 111 and the air outlet channel 112 through the pressure relief hole 121. At the same time, the end surface where the first port 122 of the valve seat 120 is located is provided with an annular convex portion surrounding the first port 122, and the annular convex portion is the first sealing portion 140. Furthermore, the annular convex portion is provided as a variable diameter structure, that is, the cross-sectional area of ​​the annular convex portion gradually increases in the direction from the first port 122 to the second port 123, wherein the cross section is a plane perpendicular to the first axis. For example, in this embodiment, the outer circumferential surface of the annular protrusion is set as a conical surface, and the inner circumferential surface is set as a cylindrical surface. In this way, the width of the side of the annular protrusion away from the first port 122 is small, and the side of the annular protrusion away from the first port 122 is used for sealing with the second sealing portion 250. The contact area between the two is small, the pressure is strong, and the seal is tighter. Further, the side of the annular protrusion away from the first port 122 is set as an arc surface, and the end face shape of the arc surface can be circular. In other words, the side of the annular protrusion away from the first port 122 is set as a chamfer. Optionally, the radius of the chamfer is set between 0.05mm-0.15mm, so that the width of the arc surface can be controlled between 0.1mm-0.3mm, and the width refers to the maximum distance between the inner edge and the outer edge of the cross-sectional profile of the arc surface in the direction perpendicular to the first axis, and the maximum distance is controlled between 0.1mm-0.3mm.

[0048] Please combine Figure 2 and Figure 3, Further, a part of the end surface where the first port 122 is located is set as the first limiting portion 1221. The first limiting portion 1221 can be an annular plane surrounding the annular convex portion. The first limiting portion 1221 is used to abut against the valve core 200 and can limit the movement distance of the valve core 200.

[0049] Please refer to Figures 1-4 , In this embodiment, optionally, the valve core 200 includes a guide sleeve 210, a core body 220, a sealing gasket 230, and a pressing plate 240. The guide sleeve 210 is fixed on the main body 110 and penetrates the main body 110. The guide sleeve 210 is substantially coaxially arranged with the pressure relief hole 121. There is a spacing between the guide sleeve 210 and the first port 122 of the valve seat 120. For example, the guide sleeve 210 can be a cylindrical tube, and the guide sleeve 210 is welded to the main body 110. The core body 220 includes a connected limiting plate portion 221 and a sliding cylinder portion 222. The sliding cylinder portion 222 is inserted into the guide sleeve 210 and the two are slidably connected in the extending direction of the first axis. A sealing ring is arranged between the guide sleeve 210 and the sliding cylinder portion 222. It should be understood that for the slidable connection between the guide sleeve 210 and the sliding cylinder portion 222, in order to reduce friction, the smoothness of the inner wall of the guide sleeve 210 and the outer wall of the sliding cylinder portion 222 can be improved. At the same time, the limiting plate portion 221 is arranged inside the sliding cylinder portion 222, that is, a groove is defined between the end of the sliding cylinder portion 222 close to the first port 122 and the limiting plate portion 221. And, a second limiting portion 2221 is arranged on the end surface of the sliding cylinder portion 222 close to the first port 122. The second limiting portion 2221 can be set as an annular plane. A first ventilation hole 223 is arranged on the limiting plate portion 221. The number of the first ventilation holes 223 is set as required. The pressing plate 240 is fixedly connected to the limiting plate portion 221. The sealing gasket 230 is an annular member. The sealing gasket 230 is embedded in the groove and is jointly limited by the pressing plate 240 and the limiting plate portion 221. The sealing gasket 230 cannot move relative to the limiting plate portion 221 and the pressing plate 240 in the extending direction of the first axis. The second sealing portion 250 is located on the sealing gasket 230 or the second sealing portion 250 is the sealing gasket 230. The side surface of the sealing gasket 230 away from the limiting plate portion 221 is higher than the notch of the groove. A hole corresponding to the first ventilation hole 223 is arranged on the pressing plate 240, so as to connect the air inlet channel 111, the first ventilation hole 223, and the first chamber 313.

[0050] Further, when the valve core 200 is in the first position, the distance D between the first limiting portion 1221 and the second limiting portion 2221 is set to be 0.4 mm - 0.6 mm. In this way, when the reset assembly 400 provides a sealing force for the valve core 200 through the diaphragm 320, since the contact area between the first sealing portion 140 and the second sealing portion 250 is small and the pressure is high, there is a potential risk that the first sealing portion 140 may damage the second sealing portion 250 during operation. Therefore, by setting the surface of the first sealing portion 140 in contact with the second sealing portion 250 to be an arc surface, the stress concentration of the second sealing portion 250 can be reduced, and the probability of the second sealing portion 250 being damaged by the first sealing portion 140 can be lowered. At the same time, through the structural arrangement of the first limiting portion 1221 and the second limiting portion 2221, when the second sealing portion 250 moves further closer to the first sealing portion 140 on the premise of being in sealing contact with the first sealing portion 140, the first limiting portion 1221 and the second limiting portion 2221 can abut against each other, thereby restricting the distance of the second sealing portion 250 moving closer to the first sealing portion 140, and avoiding the phenomenon that the first sealing portion 140 pierces the second sealing portion 250 resulting in the damage of the second sealing portion 250 and the sealing failure, with high use safety.

[0051] It should be understood that when the valve core 200 is in the first position, the distance between the first limiting portion 1221 and the second limiting portion 2221 can be set to 0.4 mm, 0.5 mm or 0.6 mm, etc.

[0052] In addition, when the core body 220 moves between the first position and the second position relative to the guide sleeve 210, the core body 220 and the guide sleeve 210 are always hermetically connected through a sealing ring, so as to prevent the first chamber 313 from communicating with the outside through the air outlet channel 112.

[0053] In this embodiment, optionally, the housing 310 includes a first half-shell 311 and a second half-shell 312, and the first half-shell 311 and the second half-shell 312 are detachably connected, so that it is convenient to replace and adjust the diaphragm 320. The first half-shell 311 and the diaphragm 320 jointly define a first chamber 313, and the second half-shell 312 and the diaphragm 320 jointly define a second chamber 314. The first half-shell 311 is fixedly connected to the valve body 100, and a second ventilation hole 3111 and a sliding hole 3112 are provided on the first half-shell 311. The number of the second ventilation holes 3111 is set as required, and the second ventilation hole 3111 communicates the guide sleeve 210 and the first chamber 313. When the number of the second ventilation holes 3111 is multiple, the multiple second ventilation holes 3111 are arranged around the sliding hole 3112.

[0054] Please refer to Figure 1, Further, the driving component 300 further includes a first tray 340 and a second tray 350. Both the first tray 340 and the second tray 350 are fixed on the force transmission rod 330. The diaphragm 320 is sleeved outside the force transmission rod 330 and is clamped between the first tray 340 and the second tray 350. The edge of the diaphragm 320 is clamped between the first half shell 311 and the second half shell 312. The force transmission rod 330 passes through the sliding hole 3112 and is slidably connected to the sliding hole 3112 in the extending direction of the first axis. The force transmission rod 330 penetrates through the limiting plate portion 221 and the pressing plate 240. The force transmission rod 330 is arranged as a stepped rod. The rod section with a larger diameter of the force transmission rod 330 passes through the sliding hole 3112. A nut 360 is arranged on the rod section with a smaller diameter of the force transmission rod 330. The limiting plate portion 221 and the pressing plate 240 are clamped between the abutting surface formed at the connection of the rod section with a larger diameter and the rod section with a smaller diameter and the nut 360. In this way, the movement of the limiting plate portion 221 and the pressing plate 240 relative to the force transmission rod 330 in the extending direction of the first axis is restricted. The limiting plate portion 221 and the pressing plate 240, that is, the valve core 200, can reciprocate in the extending direction of the first axis under the drive of the force transmission rod 330, so as to switch between the first position and the second position.

[0055] Please refer to Figure 1, in this embodiment, optionally, the reset component 400 includes a base body 410, a base 420, an adjustment seat 430, an elastic member 440, an adjustment rod 450, an end cap 460, a protective cover 470, and a ventilation cover 480. Among them, the base body 410 is configured as a cylindrical structure, and one end of the base body 410 penetrates through the second half shell 312 and communicates with the second chamber 314. For example, the base body 410 can be welded to the second half shell 312, with a firm structure and good sealing performance. The base 420 is sleeved outside the force transmission rod 330 and the two are fixedly connected. The adjustment seat 430 is slidably arranged inside the base body 410 in the extending direction of the first axis, and a third ventilation hole 431 is provided on the adjustment seat 430. The elastic member 440 is configured as a spring, a shrapnel, a rubber member, etc., and the elastic member 440 is clamped between the base 420 and the adjustment seat 430. The elastic member 440 is used to make the valve core 200 tend to move in the direction of the sealing pressure relief hole 121. The end cap 460 is fixed on the base body 410 and is hermetically connected to the base body 410. A threaded hole 461 and a fourth ventilation hole 462 are provided on the end cap 460. The adjustment rod 450 is screwed into the threaded hole 461 and its end abuts against the adjustment seat 430. By rotating the adjustment rod 450, the relative position between the adjustment rod 450 and the threaded hole 461 can be changed, so as to change the length of the adjustment rod 450 extending into the base body 410, and further change the elastic force of the elastic member 440, and finally realize the adjustment of the set pressure value of the safety valve. The end cap 460 can be threadedly connected to the base body 410, which is convenient for disassembly and assembly. The protective cover 470 is detachably connected to the end cap 460, and a part of the adjustment rod 450 is located in the space jointly defined by the protective cover 470 and the end cap 460. A fifth ventilation hole 471 is provided at one end of the protective cover 470 away from the end cap 460. The ventilation cover 480 is sleeved at one end of the protective cover 470 away from the end cap 460. A sixth ventilation hole 481 is provided on the peripheral wall of the ventilation cover 480, and the height of the sixth ventilation hole 481 is lower than the height of the orifice of the fifth ventilation hole 471 away from the end cap 460, so as to prevent rainwater from entering during outdoor installation.

[0056] It should be understood that a sealing ring can be provided between the protective cover 470 and the end cap 460.

[0057] In addition, a limiting groove 432 can be provided on the end face of the adjustment seat 430 facing away from the end cap 460. The limiting groove 432 can be a spherical groove. The adjustment rod 450 has a spherical head 451. The spherical head 451 contacts the limiting groove 432. When the adjustment rod 450 rotates relative to the end cap 460 to adjust the movement of the adjustment seat 430, the friction between the spherical head 451 and the adjustment seat 430 is small, it is not easy to wear, and the service life is long.

[0058] The safety valve for protecting the micro-pressure device provided in this embodiment, before use, connect the main body 110 to the device body, so that the end of the air inlet channel 111 is communicated with the inner cavity of the device body. Then, rotate the adjusting rod 450 according to requirements, so as to adjust the elastic force of the elastic member 440, so as to realize the adjustment of the set pressure value of the safety valve. After the adjustment is completed, the inflation operation can be carried out. When the pressure of the device body is lower than the set pressure value of the safety valve, the upward force of the fluid medium acting on the diaphragm 320 is lower than the downward force of the elastic member 440 acting on the diaphragm 320, that is, the external force received by the diaphragm 320 on one side of the first chamber 313 is less than the external force received by the diaphragm 320 on one side of the second chamber 314. At this time, the valve core 200 is in the first position, and the first sealing portion 140 and the second sealing portion 250 cooperate to close the pressure relief hole 121, and the fluid medium in the device body will not be discharged from the air outlet channel 112 through the pressure relief hole 121. When the pressure of the device body reaches the set pressure value of the safety valve, the upward force of the fluid medium acting on the diaphragm 320 is greater than the downward force of the elastic member 440 acting on the diaphragm 320, the diaphragm 320 moves upward to drive the valve core 200 to move upward, and the first sealing portion 140 moves away from the second sealing portion 250 to release the seal of the pressure relief hole 121, and the pressure relief hole 121 is opened to discharge the overpressure gas in the device body. After the overpressure gas is discharged, the pressure in the inner cavity of the device body gradually decreases. When the pressure in the device body decreases to be lower than the set pressure value of the safety valve, the valve core 200 is reset under the action of the reset assembly 400, and the first sealing portion 140 and the second sealing portion 250 cooperate again to seal the pressure relief hole 121 and achieve a tight seal within the range of ≥90% of the set pressure.

[0059] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A safety valve for protecting a micro-pressure device, characterized in that, Comprising: A valve body, a valve core, a driving assembly, and a reset assembly; The valve body is provided with a pressure relief hole and a first sealing portion; the valve core is provided with a second sealing portion and a vent hole for communicating with the inner cavity of the micro-pressure device. The valve core is movably connected to the valve body and is used to switch between a first position and a second position. When in the first position, the first sealing portion and the second sealing portion are in contact to close the pressure relief hole. When in the second position, the first sealing portion and the second sealing portion are separated to open the pressure relief hole; The driving assembly includes a housing, a diaphragm, and a transmission member. The housing is connected to the valve body. The effective surface area of the diaphragm is larger than the effective surface area of the first sealing portion. The diaphragm is disposed in the housing and divides the housing into a mutually independent first chamber and a second chamber. The first chamber communicates with the vent hole; the transmission member is connected to both the diaphragm and the valve core; The reset assembly is connected to the housing and is used to make the valve core have a tendency to move from the second position to the first position; The ratio of the effective surface area of the diaphragm to the effective surface of the first sealing portion is set between 10 and 20; The valve body includes a main body and a valve seat. The main body is provided with an air inlet passage and an air outlet passage. The air inlet passage communicates with the vent hole; when in the first position, the air inlet passage and the air outlet passage are blocked; when in the second position, the air inlet passage communicates with the air outlet passage through the pressure relief hole; the pressure relief hole is provided on the valve seat, and the pressure relief hole has a first port and a second port. The first sealing portion is disposed on the end surface where the first port is located; The housing includes a first half shell and a second half shell. The first half shell and the second half shell are detachably connected; the first half shell and the diaphragm jointly define the first chamber, and the second half shell and the diaphragm jointly define the second chamber; the reset assembly is connected to the second half shell; the transmission member passes through the first half shell and is connected to the valve core.

2. The safety valve for protecting a micro-pressure device according to claim 1, wherein: The first sealing portion is set as an annular convex portion arranged around the port of the pressure relief hole, and the cross-sectional area of the annular convex portion gradually increases in the direction from the first port to the second port.

3. The safety valve for protecting a micro-pressure device according to claim 2, wherein: The side surface of the annular convex portion facing away from the first port is set as an arc surface for fitting with the second sealing portion.

4. The safety valve for protecting a micro-pressure device according to claim 3, wherein: The valve core includes a core body and a sealing gasket. The sealing gasket is connected to the core body, and the second sealing portion is disposed on the sealing gasket; the end surface where the first port is located is provided with a first limiting portion, and the core body is provided with a second limiting portion. The first limiting portion is used to abut against the second limiting portion to limit the distance of the sealing gasket moving in the direction close to the annular convex portion.

5. The safety valve for protecting a micro-pressure device according to claim 1, wherein: The reset assembly includes a base body and an elastic member. The base body is connected to the housing. The elastic member abuts against both the base body and the diaphragm simultaneously, and is used to make the diaphragm tend to move from the second position to the first position.

6. The safety valve for protecting a micro-pressure device according to claim 5, wherein: The elastic force of the elastic member is adjustable.

7. A micro-pressure device, characterized in that, The micro-pressure device includes: A device body and the safety valve for protecting a micro-pressure device according to any one of claims 1-6. The valve body is connected to the device body, and the vent hole is communicated with the inner cavity of the device body. When in the first position, the inner cavity is blocked from the pressure relief hole, and when in the second position, the inner cavity is communicated with the pressure relief hole.

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