Thermal pressure relief device, cylinder valve and high-pressure gas cylinder

Abstract

The embodiment of the utility model provides a thermal pressure relief device, a cylinder valve and a high-pressure gas cylinder, and the thermal pressure relief device comprises a shell arranged in the axial direction; the plunger can be inserted into the shell in an axial sliding mode, and the plunger can slide from a blocking position suitable for blocking the pressure relief channel to an opening position suitable for opening the pressure relief channel in the axial direction; the multiple sealing pieces are installed on the plunger at intervals in the axial direction so as to provide multi-stage sealing for the pressure relief channel when the plunger is located at the plugging position; and the thermosensitive element is arranged in the shell and abuts against the plunger so as to keep the plunger at the plugging position, and the thermosensitive element can contract in the axial direction in response to the change of temperature so as to allow the plunger to slide from the plugging position to the opening position. The sealing robustness and reliability can be improved, and unexpected pressure leakage is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas cylinders, and in particular to a thermal pressure relief device, a cylinder valve and a high-pressure gas cylinder. BACKGROUND

[0002] Unless otherwise indicated herein, the methods described in this section are not prior art to the claims listed below and are not admitted to be prior art by inclusion in this section.

[0003] High-pressure gas in a high-pressure gas cylinder (e.g., a hydrogen storage cylinder) expands when the temperature rises, so it is necessary to provide a thermal pressure relief device at the cylinder port. When the temperature in the cylinder or the environment reaches a certain value, the thermal pressure relief device is activated to relieve pressure, avoiding explosion of the high-pressure gas cylinder due to increased pressure.

[0004] However, the existing thermal pressure relief device has poor sealing effect, and it is difficult to effectively seal the pressure relief channel of the cylinder port when pressure relief is not needed. CONTENT OF THE UTILITY MODEL

[0005] The purpose of the present application is to provide a thermal pressure relief device, a cylinder valve and a high-pressure gas cylinder to solve the problems mentioned in the background or other similar problems.

[0006] According to an aspect of an embodiment of the present application, a thermal pressure relief device is provided for plugging or opening a pressure relief channel. The thermal pressure relief device comprises: a housing arranged in an axial direction; a plunger axially slidably inserted into the housing, the plunger being slidable in the axial direction from a plugging position adapted to plug the pressure relief channel to an opening position adapted to open the pressure relief channel; a plurality of sealing members spaced apart along the axial direction and mounted on the plunger to provide a plurality of levels of sealing for the pressure relief channel when the plunger is in the plugging position; and a thermal element arranged in the housing and abutting against the plunger to hold the plunger in the plugging position, the thermal element being contractible in the axial direction in response to a change in temperature to allow the plunger to slide from the plugging position to the opening position.

[0007] In some embodiments, the plurality of sealing members are respectively made of rubber materials with different hardnesses.

[0008] In some embodiments, the hardnesses of the rubber materials of the plurality of sealing members arranged in sequence in a direction towards an inlet of the pressure relief channel are sequentially increased.

[0009] In some embodiments, the plunger has a plunger head for insertion into the pressure relief channel, and the plurality of sealing members are mounted on the plunger head.

[0010] In some embodiments, any two adjacent seals are separated by a boss on the sidewall of the plunger head; and / or, one seal adjacent to the end face of the plunger head is clamped by two retaining rings detachably connected to the plunger head.

[0011] In some embodiments, the housing defines an inner cavity for the plunger to be inserted, the housing has an abutting face facing the inner cavity and abutting against the heat-sensitive element; the housing further defines an additional accommodating groove disposed around the abutting face and communicating with the inner cavity.

[0012] In some embodiments, a support ring for supporting the plunger to slide is provided between the plunger and the housing, the support ring is made of self-lubricating material.

[0013] In some embodiments, the heat-sensitive element abuts against the plunger through a buffer, the buffer covers part or all of the outer surface of the heat-sensitive element.

[0014] In some embodiments, the thermal pressure relief device further comprises an elastic member mounted on the plunger along the axial direction for applying an elastic force to the plunger towards the heat-sensitive element.

[0015] In some embodiments, the housing is provided with an observation hole facing the heat-sensitive element, and a plug is detachably connected in the observation hole.

[0016] In some embodiments, the outer wall of the housing is provided with a plurality of dismounting holes; the thermal pressure relief device further comprises a dismounting tool, the dismounting tool comprises a handle and an adapter head, and the adapter head is provided with a plurality of adapter protrusions matching the plurality of dismounting holes.

[0017] According to another aspect of the embodiments of the present application, a bottle valve is provided, which comprises a valve body and the above-mentioned thermal pressure relief device, the valve body is provided with a pressure relief passage and a mounting passage which are disposed in the axial direction and communicate with each other; the thermal pressure relief device is mounted in the mounting passage for blocking or opening the pressure relief passage.

[0018] In some embodiments, the valve body is further provided with an exhaust port communicating with the mounting passage; the exhaust port is disposed in an oblique direction inclined by an obtuse angle relative to the pressure relief passage.

[0019] According to still another aspect of the embodiments of the present application, a high-pressure gas cylinder is provided, which comprises the above-mentioned bottle valve.

[0020] The thermal pressure relief device of the embodiments of the present application can provide multi-stage sealing for the pressure relief passage by providing a plurality of seals on the plunger in the axial direction, thereby improving the robustness and reliability of the sealing, effectively blocking the pressure relief passage and avoiding undesired pressure leakage.

[0021] The heat pressure relief device of the embodiment of the present application reduces the length of the inner cavity occupied by the molten or broken thermal element by arranging an additional accommodating groove in the shell to accommodate the molten or broken thermal element, thereby allowing the plunger to slide a longer axial distance without increasing the overall volume of the heat pressure relief device, and ensuring that the plunger can effectively open the pressure relief channel. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present specification or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings described below are only some of the embodiments described in the present specification, and those skilled in the art can also obtain other drawings according to these drawings without creative labor. In the drawings:

[0023] Figure 1 is a perspective structural schematic view of the heat pressure relief device of an embodiment of the present application;

[0024] Figure 2 is an exploded structural schematic view of the heat pressure relief device of an embodiment of the present application;

[0025] Figure 3 is a sectional view of the heat pressure relief device of an embodiment of the present application;

[0026] Figure 4 is a sectional view of the heat pressure relief device of another embodiment of the present application;

[0027] Figure 5 is a sectional view of the bottle valve of an embodiment of the present application, in which the plunger is in a blocking position;

[0028] Figure 6 is a sectional view of the bottle valve of an embodiment of the present application, in which the plunger is in an open position;

[0029] Figure 7 is a perspective structural schematic view of the disassembling tool in an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present specification will be described clearly and completely below in conjunction with the drawings in the embodiments of the present specification. Obviously, the described embodiments are only some of the embodiments of the present specification, not all. Based on the embodiments in the present specification, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present specification.

[0031] The embodiment of the present application provides a thermal pressure relief device for plugging or opening a pressure relief passage. The thermal pressure relief device comprises a housing, a plunger, a plurality of sealing members and a thermal sensitive element. The housing is arranged along an axial direction. The plunger is axially slidably inserted into the housing, and the plunger can slide along the axial direction from a plugging position suitable for plugging the pressure relief passage to an opening position suitable for opening the pressure relief passage. The plurality of sealing members are spaced apart along the axial direction and arranged on the plunger, so as to provide multi-stage sealing for the pressure relief passage when the plunger is in the plugging position. The thermal sensitive element is arranged in the housing and abuts against the plunger, so as to keep the plunger in the plugging position, and the thermal sensitive element can contract in the axial direction in response to a change in temperature, so as to allow the plunger to slide from the plugging position to the opening position.

[0032] The thermal pressure relief device of the embodiment of the present application can provide multi-stage sealing for the pressure relief passage by arranging the plurality of sealing members on the plunger and spaced apart along the axial direction, thereby improving the robustness and reliability of the sealing, so as to effectively plug the pressure relief passage and avoid undesired pressure leakage.

[0033] The embodiments of the present application will be described below with reference to the accompanying drawings.

[0034] The embodiment of the first aspect of the present application provides a thermal pressure relief device 100 for plugging or opening a pressure relief passage. For example, the pressure relief passage can be a gas discharge passage on a cylinder valve of a high-pressure gas cylinder, and the gas in the high-pressure gas cylinder can be discharged through the gas discharge passage. The high-pressure gas cylinder can be, but is not limited to, a hydrogen storage cylinder.

[0035] Figure 1 is a schematic diagram of a perspective structure of the thermal pressure relief device according to an embodiment of the present application; Figure 2 is a schematic diagram of an exploded structure of the thermal pressure relief device according to an embodiment of the present application; Figure 3 is a sectional view of the thermal pressure relief device according to an embodiment of the present application.

[0036] As shown in Figure 1 , Figure 2 and Figure 3 , the thermal pressure relief device 100 comprises a housing 110, and the housing 110 is arranged along an axial direction, which can be a direction parallel to a central axis C1 of the housing 110.

[0037] In the example shown in Figure 3 , the housing 110 extends annularly around the central axis C1 to form a substantially cylindrical body structure; and the housing 110 extends along the central axis C1 from an open end 111 to a closed end 112, and the closed end 112 is substantially perpendicular to the central axis C1.

[0038] In the example shown in Figure 3In the example, the housing 110 has an inner cavity 113, and the closed end 112 has an abutment surface 114 and an inner end face 115 facing the inner cavity 113. In the axial direction, the abutment surface 114 is located between the inner end face 115 and the open end 111 of the housing 110. The inner cavity 113 extends axially from the open end 111 of the housing 110 to the abutment surface 114. The housing 110 also has an additional receiving groove 1131 extending axially from the abutment surface 114 to the inner end face on the radially outer side of the abutment surface 114. Compared with the housing structure in the prior art that does not have the additional receiving groove 1131, this housing structure of the present application can provide a larger receiving space. In other words, this design can provide more internal space without increasing the overall length of the housing 110.

[0039] Specifically, for example Figure 3 As shown, the abutment surface 114 and the inner end surface 115 are approximately perpendicular to the central axis C1 of the housing 110. The abutment surface 114 can be an annular surface, and the inner end surface 115 can be an annular surface. The inner end surface 115 is located radially outside the abutment surface 114 and is further away from the opening end 111 of the housing 110 than the abutment surface 114. Thus, an additional receiving groove 1131 is formed between the abutment surface 114 and the inner end surface 115. This additional receiving groove 1131 expands the receiving space of the housing 110 and can provide a greater axial sliding distance for the plunger 120, which will be described later.

[0040] like Figure 1 and Figure 3 As shown, the thermal pressure relief device 100 also includes a plunger 120, which is arranged axially and inserted axially into the inner cavity 113 of the housing 110 from the open end 111. The plunger 120 is slidable relative to the housing 110 in the axial direction. The plunger 120 can slide axially relative to the housing 110 from a blocking position suitable for blocking a pressure relief channel 201 (e.g., Figure 5 (As shown) Slide it to the open position suitable for opening the pressure relief channel 201 (e.g.) Figure 6 (As shown). It can be understood that the blocking position is closer to the pressure relief channel 201 than the opening position.

[0041] exist Figure 3 In the example, plunger 120 has a feature for inserting pressure relief channel 201 (e.g. Figure 5 The plunger head 121 (as shown).

[0042] exist Figure 3 In the example, the plunger head 121 of the plunger 120 is located outside the housing 110 to facilitate insertion into the pressure relief channel 201 (e.g., Figure 5As shown, the end of the plunger 120 opposite to the plunger head 121 is inserted into the inner cavity 113 of the housing 110 and slidably engages with the inner cavity 113 of the housing 110. For ease of description, this end of the plunger 120 is referred to as the sliding end 122. The diameter of the sliding end 122 is slightly smaller than the inner diameter of the housing 110 to facilitate insertion into the inner cavity 113 of the housing 110. The diameter of the plunger head 121 is slightly smaller than the inner diameter of the pressure relief channel 201 to facilitate insertion into the pressure relief channel 201. Figure 3 The diameter of the plunger head 121 shown is smaller than the diameter of the sliding end 122.

[0043] exist Figure 3 In the example, the plunger 120 also includes an intermediate section 123 connected between the sliding end 122 and the plunger head 121. The diameter of the intermediate section 123 is smaller than the diameter of the sliding end 122 and larger than the diameter of the plunger head 121, so that the entire plunger 120 forms a stepped structure, which optimizes its sliding performance in the housing 110 and is suitable for installing components such as the seal 130, the support ring 150 and the elastic element 170, which will be described later. However, this application does not limit the specific structure of the plunger 120.

[0044] like Figure 1 , Figure 2 and Figure 3 As shown, the thermal relief device 100 also includes a plurality of seals 130 spaced apart along the axial direction on the plunger 120, for use when the plunger 120 is in Figure 5 The sealing position shown provides a multi-stage seal for the pressure relief passage 201. Multiple seals 130 should be understood as at least two seals 130, and each seal 130 may be, but is not limited to, a sealing ring.

[0045] exist Figure 3 In the example shown, the thermal relief device 100 includes two seals 130, thereby providing a two-stage seal for the pressure relief passage 201. For ease of description, these two seals 130 are referred to as the first seal 131 and the second seal 132, respectively. It should be understood that in the other example shown, there may also be three or more seals 130 to provide three or more stages of sealing.

[0046] For example Figure 3 As shown, the first seal 131 is installed in the first mounting groove 1211 of the plunger head 121. The first mounting groove 1211 extends axially from the end face of the plunger head 121 to a boss 1212 of the plunger head 121. The cross-section of the first mounting groove 1211 is approximately L-shaped. The second seal 132 is installed in the second mounting groove 1213 of the plunger head 121. The cross-section of the second mounting groove 1213 is approximately U-shaped. The second mounting groove 1213 and the first mounting groove 1211 are separated by the boss 1212.

[0047] existFigure 1 and Figure 3 In the example, the first seal 131 is held and fixed by two retaining rings 133 detachably connected to the plunger head 121. For example, the two retaining rings 133 are provided in the first mounting groove 1211 and are threadedly connected to the plunger head 121, thereby ensuring the stability and easy disassembly of the first seal 131.

[0048] exist Figure 1 and Figure 3 In the example, the second seal 132 is axially movable within the second mounting groove 1213. This axial movement capability allows the second seal 132 to automatically compensate for thermal expansion caused by temperature changes and positional displacement caused by pressure fluctuations, thereby ensuring consistently reliable sealing performance. Specifically, in the axial direction, the width of the second mounting groove 1213 is greater than the width of the second seal 132 to provide axial movement space for the second seal 132.

[0049] Preferably, the multiple seals 130 of the heat relief device 100 are made of rubber materials with different hardnesses to ensure excellent sealing performance and adaptability under different operating conditions. In the embodiments of this application, multiple seals are made of known rubber materials.

[0050] More preferably, such as Figure 5 As shown, the hardness of the rubber material of the plurality of seals 130 arranged sequentially in the direction toward the inlet of the pressure relief channel 201 increases sequentially. In other words, the hardness of the plurality of seals 130 arranged sequentially in the direction toward the end face of the plunger head 121 increases sequentially to ensure higher sealing performance and high pressure resistance at the position close to the inlet of the pressure relief channel 201, thereby achieving high pressure sealing, and to maintain good flexibility and adaptability at the position away from the inlet of the pressure relief channel 201, thereby achieving low temperature sealing.

[0051] exist Figure 3 In the example, the hardness of the rubber material of the first seal 131 is greater than the hardness of the rubber material of the second seal 132.

[0052] For example, the first seal 131 is made of ethylene propylene diene monomer (EPDM) rubber with a hardness of 80-90 HA, and has extremely low gas permeability and extremely high hydrogen explosion resistance. The hydrogen explosion resistance refers to the ability to withstand a pressure change from high pressure (such as hundreds of atmospheres) to one atmosphere without damage, leakage or significant performance degradation.

[0053] For example, the second seal 132 is made of silicone (VMQ) with a hardness of 70-80HA, and has a lower low temperature resistance than EPDM, capable of withstanding temperatures as low as -60°C.

[0054] likeFigure 3 and Figure 5 As shown, the thermal relief device 100 also includes a thermal element 140 disposed in the inner cavity 113 of the housing 110. The thermal element 140 abuts against the sliding end 122 of the plunger 120 to hold the plunger 120 in the sealing position; as Figure 6 As shown, when the temperature changes, the thermistor 140 can sense the temperature change and contract in the axial direction to allow the plunger 120 to slide from the blocked position to the open position.

[0055] Thermistor 140 is designed to sense temperature changes (e.g., temperature rise) in the surrounding environment or a specific area. When the temperature changes, the material of thermistor 140 undergoes a corresponding physical change, such as shrinkage. This shrinkage can be cracking, melting, or bending, which reduces the length of thermistor 140 in the axial direction to allow plunger 120 to slide from a blocked position to an open position.

[0056] For example, the material of the thermistor 140 can be a known material such as a glass bulb, a fusible alloy, or a shape memory alloy (such as nitinol). The thermistor 140 made of a glass bulb can break when the temperature rises to a preset temperature; the thermistor 140 made of a fusible alloy can melt when the temperature rises to a preset temperature; and the thermistor 140 made of a shape memory alloy can undergo a shape change (such as bending or twisting) when the temperature rises to a preset temperature. All of these can achieve the axial contraction of the thermistor 140.

[0057] When the thermal depressurization device 100 of this application embodiment is used for a hydrogen storage cylinder, the temperature at which the hydrogen storage cylinder needs to be depressurized is usually 110±5 degrees Celsius. Therefore, the preset temperature can be set to 110±5 degrees Celsius, and a known material that can shrink at this temperature can be selected to make the thermal element 140.

[0058] exist Figure 3 In the example, the diameter of the unshrinked thermal element 140 (i.e., the original diameter) is smaller than the inner diameter of the housing 110. One end of the thermal element 140 abuts against the abutment surface 114 of the housing 110, and the other end of the thermal element 140 abuts against the sliding end 122 of the plunger 120. Thus, the thermal element 140 serves to support the plunger 120 and hold the plunger 120 in place. Figure 5 The indicated sealing position ensures that the pressure relief channel 201 is closed.

[0059] When the temperature rises to the preset temperature, the thermistor 140 melts or breaks. The melted or broken thermistor 140 loses its original rigidity and shape, and can no longer effectively support the plunger 120. Therefore, the plunger 120 is no longer constrained by the thermistor 140 and can slide under the action of external forces (such as spring force, system pressure, etc.).Figure 6 The opening position shown, thereby opening the pressure relief passage 201. The melted or broken thermal element 140 is then spread throughout the entire radial cross-section of the inner cavity 113, and preferably fills the additional accommodating groove 1131.

[0060] It can be understood that the inner diameter of the shell 110 and the original diameter of the thermal element 140 can jointly determine the maximum axial distance that the plunger 120 can slide (i.e. the maximum axial distance between the blocking position and the opening position). The larger the inner diameter of the shell 110 and the smaller the original diameter of the thermal element 140, the smaller the axial length of the melted or broken thermal element 140, and the larger the axial distance that the plunger 120 can slide, which facilitates the plunger 120 to effectively open the pressure relief passage 201. However, the increase of the inner diameter of the shell 110 will result in the increase of the overall volume of the thermal pressure relief device 100, and the decrease of the original diameter of the thermal element 140 will result in the decrease of the supporting strength thereof.

[0061] To solve the above problems, the present application provides a new structure design of the shell 110. As mentioned above, by providing the additional accommodating groove 1131, the volume of the shell 110 can be increased without increasing the inner diameter of the shell 110 and without reducing the original size of the thermal element 140. Since the additional accommodating groove 1131 can accommodate the melted or broken thermal element 140, the length of the inner cavity 113 occupied by the melted or broken thermal element 140 is reduced, thereby allowing the plunger 120 to slide a longer axial distance without increasing the overall volume of the thermal pressure relief device 100, and ensuring that the plunger 120 can effectively open the pressure relief passage.

[0062] As shown in FIGS. 1, 2 and 3, the thermal pressure relief device 100 further comprises a buffer 160, the thermal element 140 abuts against the plunger 120 through the buffer 160, and the buffer 160 covers part or all of the outer surface of the thermal element 140. This design can provide buffering protection for the thermal element 140, and avoid the thermal element 140 from being broken due to collision or vibration. Figure 3 Figure 4 As shown in FIGS. 1, 2 and 3, the thermal pressure relief device 100 further comprises a buffer 160, the thermal element 140 abuts against the plunger 120 through the buffer 160, and the buffer 160 covers part or all of the outer surface of the thermal element 140. This design can provide buffering protection for the thermal element 140, and avoid the thermal element 140 from being broken due to collision or vibration.

[0063] In the example shown in FIGS. 1, 2 and 3, the buffer 160 is a solid buffer pad, the end surface of the sliding end 122 of the plunger 120 is provided with an embedding groove, the buffer pad is located in the embedding groove, and the larger diameter end of the thermal element 140 is inserted into the embedding groove and abuts against the buffer pad. The solid buffer pad can provide stable support and reliable contact surface, and can withstand a certain pressure. Figure 3 In the example shown in FIGS. 1, 2 and 3, the buffer 160 is a solid buffer pad, the end surface of the sliding end 122 of the plunger 120 is provided with an embedding groove, the buffer pad is located in the embedding groove, and the larger diameter end of the thermal element 140 is inserted into the embedding groove and abuts against the buffer pad. The solid buffer pad can provide stable support and reliable contact surface, and can withstand a certain pressure.

[0064] Figure 4 In the example shown in FIGS. 1, 2 and 3, the buffer 160 is a solid buffer pad, the end surface of the sliding end 122 of the plunger 120 is provided with an embedding groove, the buffer pad is located in the embedding groove, and the larger diameter end of the thermal element 140 is inserted into the embedding groove and abuts against the buffer pad. The solid buffer pad can provide stable support and reliable contact surface, and can withstand a certain pressure.​​

[0065] In another example not shown in the figures, the buffer 160 includes two buffer pads, one of which is arranged in the embedding groove of the plunger 120, and the other of which is arranged on the abutting surface 114 of the housing 110, so that the two ends of the thermosensitive element 140 are respectively abutted against the plunger 120 and the abutting surface 114 through the two buffer pads, further improving the buffering protection effect.

[0066] In yet another example not shown in the figures, the buffer 160 is a buffer sleeve, which can be a bag structure containing the entire thermosensitive element 140. The buffer sleeve can be made of a soft and heat-conductive material, which not only ensures that the thermosensitive element 140 can sensitively respond to temperature changes, but also adapts to the shrinkage and deformation of the thermosensitive element 140, and can also accommodate the broken thermosensitive element 140 to prevent it from scattering in the housing 110, thereby facilitating the removal of the broken thermosensitive element 140 from the housing 110 and facilitating the replacement of a new thermosensitive element 140, thereby realizing the reuse of the thermal pressure relief device 100.

[0067] As shown in Figure 1 and Figure 3 , the thermal pressure relief device 100 further includes a support ring 150 arranged between the plunger 120 and the housing 110, and the support ring 150 is made of a self-lubricating material. For example, the material of the support ring 150 is polytetrafluoroethylene (PTFE).

[0068] On the one hand, the support ring 150 can effectively support the plunger 120 to ensure smooth sliding of the plunger 120 relative to the housing 110 in the axial direction. On the other hand, the support ring 150 is made of a self-lubricating material, which can significantly reduce the friction between the plunger 120 and the housing 110. This low-friction feature makes the plunger 120 slide more smoothly, especially when the thermosensitive element 140 melts or breaks and the plunger 120 needs to move quickly to open the pressure relief passage 201, thereby improving the response speed and reliability of the thermal pressure relief device 100.

[0069] In Figure 3 the example, the plunger 120 and the housing 110 are clearance-fitted, the support ring 150 is arranged in an annular groove 124 on the outer side wall of the sliding end 122 of the plunger 120, and the support ring 150 is in contact with the inner side surface of the housing 110. The axial width of the annular groove 124 is greater than the axial width of the support ring 150 to allow the support ring 150 to freely adjust the position within a certain range, thereby better adapting to the slight deviation or irregular surface between the plunger 120 and the housing 110, ensuring stability and reliability during long-term use.

[0070] As shown in Figure 1 and Figure 3As shown, the thermal pressure relief device 100 further comprises a resilient member 170 mounted on the plunger 120 in the axial direction for applying a resilient force to the plunger 120 towards the thermal element 140, and the resilient member 170 and the thermal element 140 can jointly keep the plunger 120 in the sealing position. Figure 5 As shown in the sealing position, the resilient member 170 can also drive the plunger 120 to rapidly slide from the sealing position to the open position after the thermal element 140 is contracted. Figure 6 As shown in the open position, the pressure relief passage 201 is opened.

[0071] In the example shown in Figure 1 and Figure 3 , the resilient member 170 is a cylindrical spring, which is sleeved on the middle section 123 of the plunger 120, one end of the spring abuts against the protrusion 125 on the outer wall of the sliding end 122 of the plunger 120, and the other end of the spring is used to abut against the valve body 210 where the pressure relief passage 201 is located (as shown in Figure 5 ).

[0072] As shown in Figure 3 and Figure 4 , the housing 110 is provided with an observation hole 116 towards the thermal element 140, and a plug 117 is detachably connected in the observation hole 116. The state of the thermal element 140 in the housing 110 can be observed through the observation hole 116, which is convenient for monitoring and checking the working condition or the state after contraction of the thermal element 140. The plug 117 can provide reliable sealing when observation is not needed, so as to prevent foreign matters from entering the inside of the housing 110 through the observation hole 116. The plug 117 can be a screw.

[0073] In the example shown in Figure 3 and Figure 4 , the observation hole 116 is arranged at the closed end 112 of the housing 110 and extends from the outer end face of the closed end 112 to the abutting face 114 of the housing 110. In the example shown in Figure 3 , one end of the thermal element 140 is inserted into the observation hole 116, so as to ensure that the thermal element 140 is stably mounted.

[0074] As shown in Figure 3 and Figure 7 , the outer wall of the housing 110 is provided with a plurality of dismounting holes 118 (as shown in Figure 3 ) for matching with a mounting tool, and the thermal pressure relief device 100 further comprises a specially designed dismounting tool 180 (as shown in Figure 7 ) for cooperating with the plurality of dismounting holes 118 to mount or dismount the thermal pressure relief device 100 to or from a mounting position (for example, the valve body 210 of the bottle valve 200).

[0075] As shown in Figure 7As shown, the dismounting tool 180 comprises a handle 181 and an adapter head 182, and the adapter head 182 is provided with a plurality of adapter protrusions 183 matching the plurality of dismounting holes 118. This design is particularly suitable for the case that the housing 110 of the thermal pressure relief device 100 is screwed with a mounting position, for example, the outer side wall of the housing 110 is provided with external threads, and the operator can conveniently complete the mounting and dismounting operation by holding the handle 181 and rotating the housing 110. For example, the number of dismounting holes 118 can be 3 or 4.

[0076] In Figure 1 the example, the plurality of dismounting holes 118 are arranged on the outer end face of the closed end 112 of the housing 110, and the plurality of dismounting holes 118 can be arranged in a ring shape around the observation hole 116.

[0077] As Figures 1 to 4 shown, the thermal pressure relief device 100 further comprises a sealing member 119 provided on the outer side wall of the housing 110, and the sealing member 119 is used to provide sealing between the housing 110 and a mounting position after the thermal pressure relief device 100 is mounted to the mounting position. The sealing member 119 can be a sealing ring.

[0078] As Figure 5 and Figure 6 shown, the second aspect of the application provides a bottle valve 200, which comprises a valve body 210 and the thermal pressure relief device 100 of the first aspect. The valve body 210 is provided with a pressure relief passage 201 and a mounting passage 202 which are arranged in the axial direction and are connected, and the thermal pressure relief device 100 is mounted in the mounting passage 202 in the axial direction, and is used to block or open the pressure relief passage 201.

[0079] As Figure 5 shown, when the thermal sensitive element 140 remains in the original state, the plunger 120 is in the blocking position, the plunger 120 is inserted into the pressure relief passage 201, and the plurality of sealing members 130 are in sealing engagement with the inner wall of the pressure relief passage 201, so as to seal and close the pressure relief passage 201.

[0080] As Figure 6 shown, after the thermal sensitive element 140 is contracted in the axial direction, the plunger 120 slides from the blocking position to the opening position, and the plunger 120 is removed from the pressure relief passage 201, so as to open the pressure relief passage 201.

[0081] In Figure 5 and Figure 6In the example, the valve body 210 is also provided with an exhaust port 203 that communicates with the installation channel 202. The exhaust port 203 is set in an inclined direction at an obtuse angle relative to the pressure relief channel 201. Compared with the design where the exhaust port 203 is perpendicular to the pressure relief channel 201, this design reduces the resistance encountered when the gas is discharged, making the pressure relief process smoother and faster, optimizing the gas outflow path, reducing turbulence and eddy currents, and reducing the noise generated when the gas is discharged.

[0082] Specifically, such as Figure 6 As shown, the exhaust port 203 extends along the central axis C2, which is inclined at an obtuse angle α relative to the pressure relief channel 201 or the central axis C1.

[0083] Since the structure, working principle and beneficial effects of the thermal pressure relief device have been described in detail in the embodiments of the first aspect, the contents of which are incorporated herein by reference and are omitted here.

[0084] An embodiment of the third aspect of this application provides a high-pressure gas cylinder, which includes the cylinder valve of the second aspect embodiment. The cylinder valve can be disposed at the cylinder opening of the high-pressure gas cylinder. For example, the high-pressure gas cylinder is a hydrogen storage cylinder.

[0085] Since the structure, working principle and beneficial effects of the bottle valve have been described in detail in the embodiments of the second aspect, the contents of which are incorporated herein by reference, and the description is omitted here.

[0086] The above description is merely an embodiment of this specification and is not intended to limit this specification. Various modifications and variations can be made to this specification by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of the claims of this specification.

Claims

1. A thermal pressure relief device for closing or opening a pressure relief passage, characterized in that Comprising: a housing arranged along an axial direction; a plunger axially slidably inserted into the housing, the plunger being slidable along the axial direction from a blocking position adapted to block the pressure relief passage to an opening position adapted to open the pressure relief passage; a plurality of seals spaced apart along the axial direction and mounted on the plunger to provide a plurality of levels of sealing for the pressure relief passage when the plunger is in the blocking position; and a heat-sensitive element arranged in the housing and abutting against the plunger to hold the plunger in the blocking position, the heat-sensitive element being contractible in the axial direction in response to a change in temperature to allow the plunger to slide from the blocking position to the opening position.

2. The thermal pressure relief device according to claim 1, wherein: the plurality of seals are respectively made of rubber materials having different hardnesses.

3. The thermal pressure relief device according to claim 2, wherein: the rubber materials of the plurality of seals arranged in sequence in a direction towards an inlet of the pressure relief passage have hardnesses that are sequentially increased.

4. The thermal pressure relief device according to any one of claims 1 to 3, wherein: the plunger has a plunger head for insertion into the pressure relief passage, and the plurality of seals are mounted on the plunger head.

5. The thermal pressure relief device according to claim 4, wherein: any two adjacent seals are separated by a boss on a side wall of the plunger head; and / or a seal adjacent to an end face of the plunger head is clamped and fixed by two retaining rings detachably connected to the plunger head.

6. The thermal pressure relief device according to any one of claims 1 to 3, wherein: the housing defines an inner cavity for insertion of the plunger, and the housing has an abutting face towards the inner cavity and abutting against the heat-sensitive element; and the housing further defines an additional accommodating groove arranged around the abutting face and in communication with the inner cavity.

7. The thermal pressure relief device according to any one of claims 1 to 3, wherein: a support ring for supporting sliding of the plunger is arranged between the plunger and the housing, and the support ring is made of self-lubricating material.

8. The thermal pressure relief device according to any one of claims 1 to 3, wherein: the heat-sensitive element abuts against the plunger via a buffer element covering part or all of an outer surface of the heat-sensitive element. Further comprising:

9. The thermal pressure relief device according to any one of claims 1 to 3, wherein, a resilient element mounted on the plunger along the axial direction for applying a resilient force to the plunger towards the heat-sensitive element.

10. The thermal pressure relief device according to any one of claims 1 to 3, wherein: the housing is provided with an observation hole towards the heat-sensitive element, and a plug is detachably connected in the observation hole.

11. The thermal pressure relief device according to any one of claims 1 to 3, wherein: the housing is provided with a plurality of dismounting holes on an outer wall thereof; and the thermal pressure relief device further comprises a dismounting tool including a handle and an adapter head, and the adapter head is provided with a plurality of adapter protrusions matching the plurality of dismounting holes. The bottle valve comprises:

12. A bottle valve characterized in that, a valve body provided with a pressure relief passage and a mounting passage arranged along an axial direction and in communication with each other; ​ The thermal pressure relief device of any one of claims 1 to 11, installed in the installation passage for blocking or opening the pressure relief passage.

13. The bottle valve of claim 12, wherein: The valve body is further provided with an exhaust port in communication with the installation passage; and The exhaust port is arranged in an oblique direction with respect to the pressure relief passage at an obtuse angle.

14. A high pressure gas cylinder characterized by, The bottle valve of claim 12 or 13.

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