Explosion-proof valve and explosion-proof device

Abstract

The present invention provides an explosion-proof valve and explosion-proof device, which relate to the technical field of safety components. The explosion-proof valve includes a valve seat, a connecting rod, a pressure-bearing bracket, a valve core, a connecting piece and an elastic piece; the valve seat is connected to the pressure-bearing bracket by the connecting rod; the valve core is arranged on the side of the valve seat close to the pressure-bearing bracket, and the valve core and the pressure-bearing bracket are connected by the connecting piece, so that a cavity is formed inside them; the elastic piece is arranged in the cavity, and the elastic piece makes the valve core always have a tendency to abut against the valve seat; a channel is provided on the valve core, and the channel is used to connect the cavity with the protected container. The explosion-proof device includes the above-mentioned explosion-proof valve. The explosion-proof valve of the present invention is opened by the pressure difference generated by the rapid increase of pressure, which effectively shortens the time for the valve core to open, reduces the risk of using the explosion-proof valve, and can further increase the opening speed of the valve core.

Description

Technical Field

[0001] The present invention relates to the technical field of safety components, and in particular to an explosion-proof valve and an explosion-proof device. Background Art

[0002] In order to prevent the gas explosion in the container from damaging the container and the equipment connected to the container, an explosion-proof valve is usually used to leak the high-pressure gas into the atmosphere. Existing explosion-proof valves are usually composed of some auxiliary parts such as valve body, valve seat, valve core and spring. When the pressure in the container is less than the opening pressure, the elastic force of the spring presses the valve core against the valve seat, and the explosion-proof valve is in a closed state; when the pressure in the container is greater than the opening pressure, the pressure generated by the gas in the container on the valve core overcomes the elastic force of the spring, pushing the valve core away from the valve seat to open the explosion-proof valve. Existing explosion-proof valves can only be opened when the pressure in the container is greater than the opening pressure. If the gas explodes when the pressure in the container is much lower than the opening pressure, it takes a long time for the pressure in the container to rise to the opening pressure. The long opening time causes the gas to burn further, increasing the risk of using the explosion-proof valve. When the existing explosion-proof valve is used, the valve core needs to withstand a large pressure from the fuel gas, so a valve core with a larger mass should be selected; and the spring also needs a large elastic force to press the valve core against the valve seat when the pressure in the container is lower than the opening pressure, so the stiffness coefficient of the spring is large; therefore, the acceleration generated when the valve core and the spring move is small, which affects the opening speed of the explosion-proof valve. Summary of the invention

[0003] In order to overcome the deficiencies in the prior art, the present invention provides an explosion-proof valve and an explosion-proof device.

[0004] The present invention provides the following technical solutions:

[0005] An explosion-proof valve comprises a valve seat, a connecting rod, a pressure-bearing bracket, a valve core, a connecting piece and an elastic piece; the valve seat is connected to the pressure-bearing bracket via the connecting rod; the valve core is arranged on a side of the valve seat close to the pressure-bearing bracket, and the valve core and the pressure-bearing bracket are connected via the connecting piece so that a cavity is formed inside them; the elastic piece is arranged in the cavity, and the elastic piece makes the valve core always have a tendency to abut against the valve seat; a channel is provided on the valve core, and the channel is used to connect the cavity with the container to be protected.

[0006] In a possible implementation manner, the channel is a connecting hole opened on the valve core.

[0007] In a possible implementation manner, a guide hole is provided on the valve core, a guide rod is provided on the elastic member, one end of the guide rod is connected to the pressure-bearing bracket, and the other end of the guide rod is provided in the guide hole.

[0008] In a possible implementation manner, a diameter of the guide hole is greater than a diameter of the guide rod, and the channel is a gap between the guide hole and the guide rod.

[0009] In a possible implementation manner, a through hole is provided on the valve seat, and the cross-sectional area of ​​the channel is smaller than one fifth of the cross-sectional area of ​​the through hole.

[0010] In a possible implementation manner, corresponding fixing members are respectively provided on the pressure-bearing support and the valve core, and both ends of the connecting member are respectively sealed and connected to the fixing members on both sides.

[0011] In a possible implementation manner, the connecting member is a tubular connecting member that is retractable in the length direction.

[0012] In a possible implementation manner, corresponding positioning members are respectively provided on the pressure-bearing bracket and the valve core, and both ends of the elastic member are respectively fixedly connected to the positioning members on both sides.

[0013] In a possible implementation manner, a sealing ring is provided on a side of the valve seat close to the valve core.

[0014] In a second aspect, the present invention further provides an explosion-proof device, comprising the above-mentioned explosion-proof valve and a mounting shell.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The explosion-proof valve provided in the embodiment of the present invention connects the valve core and the pressure-bearing support through the connecting piece, so that the cavity is formed inside them, and the valve core is provided with a channel connected to the protected container, so that the pressure in the cavity is close to the pressure of the protected container when the gas has not exploded. When the gas explodes, the pressure in the protected container rises faster than the pressure in the cavity, thereby generating a pressure difference to open the explosion-proof valve. The explosion-proof valve of the present invention is opened by the pressure difference generated by the rapid increase in pressure, which effectively shortens the time for the valve core to open, reduces the risk of using the explosion-proof valve, and can further increase the opening speed of the valve core.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A cross-sectional view showing a closed state of an explosion-proof valve according to an embodiment of the present invention is shown;

[0020] Figure 2 A cross-sectional view showing an explosion-proof valve in an open state according to an embodiment of the present invention is shown;

[0021] Figure 3 A cross-sectional view of an explosion-proof valve equipped with a flame arrester according to an embodiment of the present invention is shown;

[0022] Figure 4 A cross-sectional view of an explosion-proof valve according to another embodiment of the present invention is shown.

[0023] Description of main component symbols:

[0024] 100-explosion-proof valve; 10-valve seat; 11-through hole; 20-connecting rod; 30-pressure-bearing bracket; 40-valve core; 41-connecting hole; 42-guide hole; 50-connecting piece; 60-sealing ring; 70-elastic piece; 80-guide rod; 90-fixing piece; 91-positioning piece; 92-sealing piece; 93-second fixing piece; 94-cavity; 200-flame arrester. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] 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. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between 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.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] Embodiment 1

[0031] See also Figures 1 to 3 The present application provides an explosion-proof valve 100. The explosion-proof valve 100 is used to discharge gas into the atmosphere when gas in a container explodes, so as to prevent the gas explosion from damaging the container and equipment connected to the container. The container may be a device containing flammable gas, such as an oil cylinder, a gas engine, etc.

[0032] like Figure 1 As shown, the explosion-proof valve 100 includes a valve seat 10, a connecting rod 20, a pressure-bearing bracket 30, a valve core 40, a connecting piece 50 and an elastic member 70. The valve seat 10 is connected to the pressure-bearing bracket 30 through the connecting rod 20, the valve core 40 is arranged on a side of the valve seat 10 close to the pressure-bearing bracket 30, the valve core 40 is connected to the pressure-bearing bracket 30 through the connecting piece 50, so that a cavity 94 is formed inside them, the elastic member 70 is arranged in the cavity 94, the elastic member 70 can hold the valve core 40 against the valve seat 10, and the valve core 40 is provided with a channel that connects the cavity 94 with the container.

[0033] In some embodiments, the valve seat 10 and the pressure-bearing bracket 30 are connected by two connecting rods 20 to form a shell of the explosion-proof valve 100. A gap is provided between the two connecting rods 20, and the gap is connected to the atmosphere, and the gas in the container can be discharged into the atmosphere through the gap.

[0034] The side of the valve seat 10 away from the pressure-bearing support 30 is connected to the container filled with fuel gas (not shown in the figure). A through hole 11 is provided on the valve seat 10. When the explosion-proof valve 100 is opened, the fuel gas in the container can be discharged into the atmosphere through the through hole 11 via the gap.

[0035] The valve core 40 is disposed on a side of the valve seat 10 close to the pressure-bearing bracket 30 . When the explosion-proof valve 100 is closed, the valve core 40 is held against the valve seat 10 . When the explosion-proof valve 100 is opened, the valve core 40 is away from the valve seat 10 .

[0036] In some embodiments, a sealing ring 60 is fixedly connected to one side of the valve seat 10 close to the pressure-bearing bracket 30. When the valve core 40 is abutted against the sealing ring 60, the sealing ring 60 is used to prevent the gas in the container from leaking into the atmosphere. The sealing ring 60 is an annular sealing ring 60, and a hole corresponding to the through hole 11 is provided in the middle. When the valve core 40 is away from the valve seat 10, the gas in the container is discharged into the atmosphere through the through hole 11 and the hole of the sealing ring 60 in turn.

[0037] One end of the connecting member 50 is fixedly connected to the side of the pressure-bearing bracket 30 close to the valve seat 10, and the other end is fixedly connected to the side of the valve core 40 away from the valve seat 10. The connecting member 50 is combined with the valve core 40 and the pressure-bearing bracket 30 to form a cavity 94 therein. The cavity 94 is located between the two connecting rods 20.

[0038] In some embodiments, the connecting member 50 is a tubular member that can be expanded or contracted in the length direction, such as a metal bellows, a rubber bellows, a rubber drum tube, etc. When the valve core 40 moves, the connecting member 50 can extend or shorten in the length direction according to the moving direction of the valve core 40.

[0039] In some embodiments, a fixing member 90 is fixedly provided on one side of the pressure-bearing support 30 close to the valve seat 10, and a corresponding fixing member 90 is fixedly provided on one side of the valve core 40 away from the valve seat 10, and both ends of the connecting member 50 are respectively sealedly connected to the fixing members 90 on both sides, so that the connecting member 50 is respectively fixedly connected to the valve core 40 and the pressure-bearing support 30. The fixing member 90 is an annular fixing member, so that the tubular connecting member 50 is easily connected to the valve core 40 and the pressure-bearing support 30.

[0040] In some embodiments, the fixing member 90 is fixedly connected to the valve seat 10 and the pressure-bearing bracket 30 by welding. However, it is not limited thereto, and in other embodiments, the fixing member 90 can also be fixedly connected by integral molding or the like. The connecting member 50 is sealedly connected to the fixing member 90 by a process such as dispensing glue.

[0041] One end of the elastic member 70 is fixed to the side of the pressure-bearing bracket 30 close to the valve seat 10, and the other end is fixed to the side of the valve core 40 away from the valve seat 10. The elastic member 70 can make the valve core 40 abut against the valve seat 10. The elastic member 70 is a spring or other parts with deformable length.

[0042] In some embodiments, a positioning member 91 is fixedly provided on one side of the pressure-bearing bracket 30 close to the valve seat 10, a corresponding positioning member 91 is fixedly provided on one side of the valve core 40 away from the valve seat 10, and the elastic member 70 is disposed between the positioning members 91 on both sides. The positioning member 91 is an annular positioning member, and the positioning member 91 is used to limit the movement of the elastic member 70.

[0043] In some embodiments, a guide hole 42 is provided on the valve core 40, and a guide rod 80 is provided in the elastic member 70, one end of the guide rod 80 is fixedly connected to the pressure-bearing bracket 30, and the other end is disposed in the guide hole 42. The guide rod 80 cooperates with the guide hole 42 to guide the movement of the valve core 40.

[0044] In some embodiments, the valve core 40 is provided with a connecting hole 41, the diameter of the guide hole 42 is equal to the diameter of the guide rod 80, and the container is connected to the cavity 94 through the connecting hole 41. When the gas in the container does not explode, the pressure in the cavity 94 is similar to the pressure in the container due to the setting of the connecting hole 41. When the gas in the container explodes, the pressure in the container rises rapidly. Although the container is connected to the cavity 94, the radial cross-sectional area of ​​the connecting hole 41 is small, so that the rising speed of the pressure in the cavity 94 is lower than the rising speed of the pressure in the container, so that a pressure difference is generated between the cavity 94 and the container.

[0045] like Figure 2 As shown, the operator adjusts the pressure of the elastic member 70 on the valve core 40 so that the pressure difference between the cavity 94 and the container reaches a certain value. The pressure brought by the pressure difference offsets the pressure of the elastic member 70 on the valve core 40, causing the valve core 40 to move away from the valve seat 10, so that the gas in the container can be discharged into the atmosphere through the gap.

[0046] As shown in Table 1, the data of the pressure in the container and the pressure in the cavity changing with time after the gas in the container explodes in one embodiment. Just before the explosion of the gas in the container, the pressure in the container is equal to the pressure in the cavity 94. When the gas in the container explodes, the rising speed of the pressure in the container is significantly higher than the rising speed of the pressure in the container, so that a pressure difference is generated between them. When the pressure difference reaches 5kPa, the explosion-proof valve 100 opens to discharge the gas in the container into the atmosphere. When the gas in the container is no longer burning, because the opening of the container connected to the atmosphere is large, the pressure in the container drops faster, and the opening of the cavity 94 connected to the atmosphere is small, and the pressure change amplitude is small, so that the pressure difference between them is reduced. When the pressure difference is lower than 5kPa, the elastic member 70 again holds the valve core 40 against the valve seat 10 to close the explosion-proof valve 100.

[0047] Table 1 Changes of pressure inside the container and the pressure inside the cavity with time during gas explosion

[0048]

[0049] In some embodiments, the diameter of the guide hole 42 is larger than the diameter of the guide rod 80. When the valve core 40 is abutted against the valve seat 10, the gas in the container enters the cavity 94 through the gap between the guide hole 42 and the guide rod 80, so that the pressure in the cavity 94 is close to the pressure in the container.

[0050] In some embodiments, the valve core 40 is provided with a plurality of the connecting holes 41. In other embodiments, the connecting holes 41 can be provided on the valve core 40, and the diameter of the guide hole 42 is also greater than the diameter of the guide rod 80. After experimental analysis, when the overall radial cross-sectional area of ​​the communication channel between the container and the cavity 94 is less than one fifth of the radial cross-sectional area of ​​the through hole 11, the pressure difference between the cavity 94 and the container is more obvious.

[0051] like Figure 3 As shown, in some embodiments, a flame arrester 200 is provided between the valve seat 10 and the container, and the flame arrester 200 is provided on a side of the valve seat 10 away from the pressure-bearing support 30. The flame arrester 200 is used to prevent the flame generated by the gas explosion from spreading into the cavity 94.

[0052] The explosion-proof valve 100 provides a channel connecting the cavity 94 and the container on the valve core 40, so that when the gas in the container does not explode, the pressure in the container is similar to the pressure in the cavity 94. When the gas explodes, the speed at which the pressure in the container rises is greater than the speed at which the pressure in the cavity 94 rises, thereby generating a pressure difference. When the pressure difference reaches a certain value, the gas pushes the valve core 40 to move, thereby discharging the gas in the container into the atmosphere.

[0053] The explosion-proof valve 100 of the present application is opened by the pressure difference between the cavity 94 and the container. Compared with the existing explosion-proof valve 100, because the pressure difference is much smaller than the pressure value in the container, the time for the pressure of the gas in the container to rise to the opening pressure before the explosion is shorter, which reduces the use risk of the explosion-proof valve 100. And because the pressure difference on both sides of the valve core 40 is small, the elastic force of the elastic member 70 pushing the valve core 40 to move is also set relatively small, and the force of the gas pushing the valve core 40 away from the valve seat 10 is also relatively small. Therefore, the valve core 40 with a smaller mass and the elastic member 70 with a smaller stiffness coefficient can be selected. Therefore, the acceleration of the valve core 40 and the elastic member 70 when moving is larger, which further improves the opening speed of the explosion-proof valve 100.

[0054] Embodiment 2

[0055] See also Figure 4 The explosion-proof valve 100 provided in this embodiment can discharge the gas into the atmosphere when the gas in the container explodes. This embodiment is an improvement made on the technical basis of the above-mentioned embodiment 1. Compared with the above-mentioned embodiment 1, the difference is that:

[0056] See also Figure 4 In some embodiments, the connector 50 is a cylindrical connector that is deformed along the length direction, and the connector 50 has a certain supporting strength. One end of the connector 50 is fixedly connected to the pressure-bearing bracket 30, and the valve core 40 is provided with a second fixing member 93, and the second fixing member 93 is sleeved with a sealing member 92, and the sealing member 92 is used for sealing between the connector 50 and the second fixing member 93.

[0057] The connecting member 50 has a certain supporting strength, so the connecting member 50 replaces the guide rod 80 to provide a guiding function when the valve core 40 moves.

[0058] Embodiment 3

[0059] The present application also provides an explosion-proof device, comprising the above-mentioned explosion-proof valve 100 and a mounting shell. The valve seat 10 is arranged on the mounting shell, and the mounting shell of the explosion-proof device can contain flammable gas. The explosion-proof valve 100 can be opened when the flammable gas explodes and generates an impact, thereby reducing the risk of gas explosion in the mounting shell and playing a role in stable pressure relief.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0061] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An explosion-proof valve, characterized in that: The invention comprises a valve seat, a connecting rod, a pressure-bearing support, a valve core, a connecting piece and an elastic piece; the valve seat is connected to the pressure-bearing support through the connecting rod; the valve core is arranged on a side of the valve seat close to the pressure-bearing support, and the valve core and the pressure-bearing support are connected through the connecting piece, so that a cavity is formed inside them; the elastic piece is arranged in the cavity, and the elastic piece makes the valve core always have a tendency to abut against the valve seat; the valve core is provided with a channel, and the channel is used to connect the cavity with the container to be protected; The valve core is provided with a guide hole, the elastic member is provided with a guide rod, one end of the guide rod is connected to the pressure-bearing bracket, and the other end is arranged in the guide hole; The diameter of the guide hole is larger than the diameter of the guide rod, and the channel is the gap between the guide hole and the guide rod and the connecting hole opened on the valve core; The connecting piece is a tubular connecting piece that is retractable in the length direction; The pressure-bearing bracket and the valve core are respectively provided with corresponding positioning members, and the two ends of the elastic member are respectively fixedly connected to the positioning members on both sides; The valve seat is provided with a through hole, and the cross-sectional area of ​​the channel is less than one fifth of the cross-sectional area of ​​the through hole.

2. The explosion-proof valve according to claim 1, characterized in that: The pressure-bearing support and the valve core are respectively provided with corresponding fixing members, and the two ends of the connecting member are respectively sealed and connected to the fixing members on both sides.

3. The explosion-proof valve according to claim 1, characterized in that: A sealing ring is arranged on one side of the valve seat close to the valve core.

4. An explosion-proof device, characterized in that: The invention comprises the explosion-proof valve as claimed in any one of claims 1 to 3 and a mounting shell.

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