Explosion-proof valve with short response time

Abstract

The utility model provides an explosion-proof valve with short response time, which comprises a valve body, a pressure relief valve, a pressure relief valve, a pressure relief valve, a pressure relief valve, a pressure relief valve, a pressure relief valve and a pressure relief valve, and is characterized in that the valve body comprises a valve seat serving as an installation foundation and a valve cover covering the valve seat; the composite explosion-proof membrane assembly is arranged in the valve seat and separates the pressure relief channel from the external environment, the composite explosion-proof membrane assembly comprises a breathable membrane providing breathable capacity and an elastic pressure relief membrane deforming after being pressed, and the breathable membrane is arranged on the periphery of the elastic pressure relief membrane in a surrounding mode; the thickness of the elastic pressure relief film is 50-200 [mu] m, the deformation height H of the elastic pressure relief film is 3-10 mm when the test pressure is 2 kPa, and the test pressure is 10%-40% of the bursting pressure of the anti-explosion valve; the blasting deformation height h of the elastic pressure relief film is 10-30 mm, and the elastic pressure relief film has the advantage of being short in response time.

Description

Technical Field

[0001] The utility model relates to the field of explosion-proof devices, in particular to an explosion-proof valve with a low response time. Background Art

[0002] An explosion-proof valve is a pressure relief device used for equipment or pipelines containing flammable gases or flammable substances in dust-proof systems. In new energy vehicles, the battery pack is a vital component, and the use of the battery pack will generate heat, which will increase the air pressure inside the battery pack. When the temperature of the battery pack rises abnormally quickly, the internal air pressure will also rise rapidly, which may cause damage to internal components or even exceed the designed sealing capacity of the battery pack and cause an explosion. In order to prevent the internal air pressure of the battery pack from being too high, an explosion-proof valve is usually installed on the battery pack to maintain the balance of internal and external air pressure. When the air pressure in the battery pack increases sharply, the breathable membrane in the explosion-proof valve will deform, and when the air pressure reaches the preset limit value (generally referred to as the burst pressure, which is the difference between the absolute values of the internal and external pressures), the breathable membrane inside the explosion-proof valve will rupture, quickly balancing the internal and external air pressures to achieve the purpose of pressure relief.

[0003] Common explosion-proof valves currently have a waterproof breathable membrane, and PTFE microporous membrane is often used as the waterproof breathable membrane. The microporous structure in the PTFE microporous membrane meets the ventilation requirements during normal use, and when the air pressure reaches the preset limit value, the PTFE microporous membrane is punctured by a puncturing member or other structure to achieve a pressure relief effect. For example, in the Chinese utility model patent with the authorization announcement number CN218648096U, an explosion-proof valve is disclosed, wherein the explosion-proof valve includes a valve cover and a valve body that can be engaged with each other; a waterproof breathable membrane is arranged in the pressure relief channel of the valve body, and the waterproof breathable membrane is a PTFE microporous membrane; a puncturing member with a sharp portion facing the waterproof breathable membrane is arranged on the valve cover, and the fixing portion of the puncturing member is arranged on the valve cover, and a notch is opened on the sharp portion of the puncturing member to form multiple tip portions.

[0004] The waterproof and breathable membrane made of PTFE in the above patent can indeed balance the internal and external air pressure during normal use. However, the elasticity of PTFE is poor and the strength is high. This means that even if the PTFE microporous membrane is in direct contact with the puncture piece under the action of the bursting pressure, it will not break immediately, but will only break when the contact point between the PTFE microporous membrane and the puncture piece undergoes further deformation under the action of air pressure. This means that it takes a certain amount of time for the PTFE microporous membrane to break and release pressure after contacting the puncture piece, which has a certain hysteresis and a long response time.

[0005] For working conditions such as new energy vehicle battery packs, once problems occur during use, the internal air pressure will rise rapidly due to rapid heating. In this case, the explosion-proof valve needs to have a low response time to achieve timely pressure relief. Therefore, how to ensure that the explosion-proof valve has a low response time is an urgent problem to be solved but difficult to solve at present. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the defects in the prior art, so as to provide an explosion-proof valve with a low response time.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] An explosion-proof valve with a low response time, comprising: a valve body, including a valve seat as an installation base and a valve cover covering the valve seat, and a pressure relief channel is provided inside the valve seat; a composite explosion-proof membrane assembly, arranged in the valve seat and separating the pressure relief channel from the external environment, including a breathable membrane providing breathability and an elastic pressure relief membrane that deforms under pressure, and the breathable membrane is arranged around the outer periphery of the elastic pressure relief membrane; the thickness of the elastic pressure relief membrane is 50-200 μm, the deformation height H of the elastic pressure relief membrane at a test pressure of 2 kPa is 3-10 mm, and the test pressure is 10%-40% of the bursting pressure of the explosion-proof valve; the bursting deformation height h of the elastic pressure relief membrane is 10-30 mm.

[0009] Through the above technical solutions, the present application introduces a membrane assembly with a special structure into the valve seat. The breathable membrane and the elastic pressure relief membrane are used in combination. Among them, the breathable membrane arranged around the outer periphery has better breathability and mechanical strength than the elastic pressure relief membrane, ensuring that the explosion-proof valve plays a role in balancing the internal and external air pressures during the normal operation of equipment such as battery packs; while the waterproof and airtight elastic pressure relief membrane has significantly better deformation ability than the breathable membrane. Therefore, when the explosion-proof valve reaches the preset bursting pressure, the elastic pressure relief membrane deforms greatly and quickly responds to burst, generating a pressure relief effect.

[0010] Specifically, as described in the aforementioned patent CN218648096U, the distance between the tip of its puncturing member and the waterproof and breathable membrane is 0.8 to 1.2 mm. That is, even when the explosion-proof valve reaches 100% of the bursting pressure, the deformation height of the waterproof and breathable membrane therein does not exceed 1.2 mm. In contrast, the specific membrane assembly in this application enables the deformation height to reach at least 2.5 times the maximum deformation height in the aforementioned patent even under relatively small pressure conditions (2 kPa, only reaching 10 - 40% of the bursting pressure); and when the explosion-proof valve reaches 100% of the bursting pressure, its deformation height h reaches 10 to 30 mm, which represents an order-of-magnitude improvement compared to the maximum deformation height of the waterproof and breathable membrane in currently common explosion-proof valves. This means that the strength of the elastic pressure relief membrane is significantly lower than that of a general waterproof and breathable membrane, the deformation ability is significantly stronger than that of a general waterproof and breathable membrane, and it will not deform prematurely due to its relatively low strength. Based on the fact that the thickness of the elastic pressure relief membrane itself is relatively small (not greater than 200 μm in the natural state), when the explosion-proof valve reaches the bursting pressure, the elastic pressure relief membrane with relatively low strength and strong deformation ability undergoes very obvious deformation (the bursting deformation height is not less than 10 mm, which indicates that although the elastic pressure relief membrane will undergo large strain under relatively small stress, it will not burst prematurely when the strain is small). This makes the elastic pressure relief membrane have a relatively small thickness and a further significantly reduced strength at this time, and the elastic pressure relief membrane in this state is extremely easy to rupture, thus quickly responding to the bursting requirement.

[0011] The good deformation ability of the elastic pressure relief membrane means that there needs to be a space for its deformation inside the valve seat. Therefore, in this application, the specific membrane assembly is set with the elastic pressure relief membrane inside and the breathable membrane ring outside. On the one hand, the breathability of the breathable membrane is not affected. On the other hand, the space above the area where the breathable membrane is provided can all be used as the deformation space for the elastic pressure relief membrane, thereby ensuring that the elastic pressure relief membrane has a good deformation space. Combined with the high deformation ability of the elastic pressure relief membrane, it ensures a quick response to the bursting requirement.

[0012] In summary, the special composite membrane structure of this application and the elastic pressure relief membrane with good deformation ability are both indispensable and must be used in combination, which greatly reduces the bursting response time of the explosion-proof valve without affecting its daily functions; in addition, since the elastic pressure relief membrane bursts due to excessive deformation, the elastic pressure relief membrane still has a large deformation tendency at the moment of bursting and is also subjected to a large impact force of the airflow, which further makes the size of the rupture opening generated by the elastic pressure relief membrane larger, further facilitating the rapid pressure relief of the pressure relief channel and producing a good pressure relief effect.

[0013] In this application, the valve cover and the valve seat can be all currently common connection methods, including but not limited to snap connection, adhesive connection, hot melt connection, etc.

[0014] In addition, in the present application, the thickness of the elastic pressure relief membrane can be measured by a thickness gauge / thickness gauge, or by taking a cross-sectional SEM image thereof, or by CT scanning, etc. When testing the deformation height of the elastic pressure relief membrane after being compressed, the effective area diameter of the elastic pressure relief membrane is controlled to be 25 mm. The elastic pressure relief membrane can be made into an explosion-proof valve for testing, or the elastic pressure relief membrane can be fixed to a test fixture for testing. After connecting the explosion-proof valve or the test fixture to the air source, the pressure is increased at a rate of about 2 kPa / s, and the deformation height of the elastic pressure relief membrane is recorded in real time; the test pressure of 2 kPa means that the pressure difference on both sides of the elastic pressure relief membrane is 2 kPa.

[0015] When testing the bursting pressure of an explosion-proof valve, use the explosion-proof valve as the test sample and preset the gas source pressure. Then connect the explosion-proof valve to the gas source and observe whether an explosion occurs. Increase the preset pressure of the gas source by a gradient of 0.1 kPa and repeat the above operation until the explosion-proof valve bursts. Record the preset pressure of the gas source at this time, which is the bursting pressure of the explosion-proof valve.

[0016] Preferably, the effective stress-bearing area of the elastic pressure relief membrane is 250 to 750 mm 2 The distance between the edge of the effective force-bearing area of the elastic pressure relief membrane and the inner circumferential wall of the valve seat is 5 to 25 mm.

[0017] Through the above technical solution, when the pressure difference on both sides is constant, the effective force-bearing area of the elastic pressure relief membrane determines the force it is subjected to to a large extent, and naturally determines the deformation amount generated when it is subjected to the bursting pressure. If the effective force-bearing area of the elastic pressure relief membrane is too small, the deformation amount generated when it is subjected to the bursting pressure will be too small. At this time, the elastic pressure relief membrane still has a certain thickness and strength, the difficulty of rupture increases, and the bursting response time will be prolonged; and if the effective force-bearing area of the elastic pressure relief membrane is too large, the deformation amount generated when it is subjected to the bursting pressure will be too large. On the one hand, this will inevitably lead to a larger volume of the explosion-proof valve (highly integrated battery packs are more sensitive to volume). On the other hand, the thickness and strength of the elastic pressure relief membrane at this time are relatively small, and it is easy to rupture before the bursting pressure is reached. Therefore, when the effective force-bearing area of the elastic pressure relief membrane is controlled to 250~750mm 2 When, the explosion-proof valve of the present application has further preferred explosion response time and explosion stability.

[0018] In addition, the distance between the elastic pressure relief membrane and the valve seat is not less than 5mm. On the one hand, it can provide the elastic pressure relief membrane with sufficient deformation space, and on the other hand, it leaves enough installation space for the breathable membrane. The explosion-proof valve has good internal and external air pressure balance capabilities during daily use; the distance between the elastic pressure relief membrane and the valve seat is not more than 25mm to ensure that the explosion-proof valve does not have an excessively large volume.

[0019] Preferably, the ratio of the bursting deformation height h of the elastic pressure relief membrane to the deformation height H of the elastic pressure relief membrane is 1.5 to 4.5; more preferably, the ratio of the bursting deformation height h of the elastic pressure relief membrane to the deformation height H of the elastic pressure relief membrane is 2 to 4.

[0020] Through the above technical solution, by reasonably setting the bursting deformation height h of the elastic pressure relief membrane and the deformation height H of the elastic pressure relief membrane under the action of a small pressure, and making the ratio of the two be 1.5 to 4.5, preferably 2 to 4, the explosion-proof valve can have a further preferred bursting response time. If the ratio of the two is too small (the difference is small), to a certain extent, the bursting stability is reduced. In particular, in working conditions such as battery packs, the inevitable vibration during operation may cause the elastic pressure relief membrane under the action of a small pressure to contact the puncturing member due to vibration and reach the bursting condition prematurely, resulting in an undesired premature bursting phenomenon; if the ratio of the two is too large (the difference is too large), it means that the elastic pressure relief membrane has a relatively small strain under the same stress, and thus has a relatively high strength, which will to a certain extent lead to an extension of the bursting response time. Therefore, by controlling the ratio of h to H, the explosion-proof valve can have a further preferred bursting response time and bursting stability.

[0021] Preferably, the ratio of the bursting deformation height h of the elastic pressure relief membrane to the thickness of the elastic pressure relief membrane is 50 to 600.

[0022] Through the above technical solution, by reasonably setting the ratio of the bursting deformation height of the elastic pressure relief membrane to the thickness of the elastic pressure relief membrane, it is possible to ensure the low response time of the explosion-proof valve while ensuring its explosion-proof effect and increasing the safety of using the explosion-proof valve. Specifically, since the thickness of the elastic pressure relief membrane will directly affect its pressure resistance, when the thickness of the elastic pressure relief membrane is too thin, a large strain will be generated under the same stress, and it may rupture when the pressure is lower than the preset bursting pressure of the explosion-proof valve, affecting the service life of the elastic pressure relief membrane. Therefore, it is necessary to control the bursting deformation height h not to be too small, that is, to control the ratio of the two not to be less than 50; when the thickness of the elastic pressure relief membrane is too thick, a small strain will be generated under the same stress. To avoid the explosion-proof valve being difficult to rupture at the preset bursting pressure and thus easily causing the explosion-proof valve to fail and unable to achieve the explosion-proof effect, it is necessary to control the bursting deformation height h not to be too large, that is, to control the ratio of the two not to be greater than 600.

[0023] In summary, in this solution, the ratio of the bursting deformation height h of the elastic pressure relief membrane to the thickness of the elastic pressure relief membrane is reasonably set, so that the elastic pressure relief membrane deforms with the change of the pressure difference inside and outside the explosion-proof valve and reduces its own thickness without premature rupture. Until the real-time deformation height of the elastic pressure relief membrane is about to reach the bursting deformation height h, the thickness of the elastic pressure relief membrane is small enough, and it is easier to burst when the pressure in the pressure relief channel exceeds the preset bursting pressure, reducing the response time of the explosion-proof valve and ensuring the explosion-proof effect of the explosion-proof valve.

[0024] Preferably, at least one side surface of the elastic pressure relief film is provided with a notch, and the ratio of the depth of the notch to the thickness of the elastic pressure relief film is 0.1-0.5; alternatively, a puncturing member is provided on the inner wall of the valve cover, and at least one sharp portion is provided at one end of the puncturing member facing away from the valve cover. Preferably, a puncturing member is provided on the inner wall of the valve cover, and a notch is formed on the sharp portion of the puncturing member to form a plurality of pointed ends.

[0025] Through the above technical solutions, the elastic pressure relief film can be burst by external force, such as a puncturing member structure with a sharp portion, etc.; it can also reach the mechanical limit and burst through its own large deformation. Regardless of the bursting method, due to its relatively small strength and large deformation before bursting, it can ensure a rapid response at the critical point of bursting.

[0026] When a notch is provided on at least one side surface of the elastic pressure relief film, on the one hand, it can reduce the local thickness of the elastic pressure relief film to form a weak part, facilitating local deformation of the elastic pressure relief film. On the other hand, when the elastic pressure relief film is deformed under pressure, a protrusion will first be formed at the position of the notch, and as the internal pressure of the explosion-proof valve increases, the protrusion will also increase until the notch ruptures, and a large amount of gas in the explosion-proof valve will gush out at the scratch, causing the elastic pressure relief film to burst. Under the action of the same air pressure, the relatively weak notch will undergo greater deformation, thus having a smaller strength and a smaller thickness compared to the overall elastic pressure relief film. Once the bursting critical point is reached, this part will quickly respond and burst instantly.

[0027] When a puncturing member is provided on the inner wall of the valve cover, the elastic pressure relief film will contact the puncturing member after deforming to a certain height, and at this time, the elastic pressure relief film has undergone a certain amount of deformation, and its thickness and mechanical strength are further reduced. When contacting the puncturing member at this time, the elastic pressure relief film can burst quickly under external force, so that the explosion-proof valve has a lower response time and can quickly relieve pressure to ensure the safety of the explosion-proof valve.

[0028] It can be understood that when a puncturing member is provided on the inner wall of the valve cover, the elastic pressure relief film in this application ruptures when contacting the puncturing member to produce a pressure relief effect. Therefore, the bursting deformation height h of the elastic pressure relief film is the minimum distance (axial distance) between the elastic pressure relief film and the puncturing member.

[0029] Preferably, a support structure for installing and supporting the composite explosion-proof film assembly is provided in the valve seat, and a first ventilation hole and a second ventilation hole are provided on the support structure. The elastic pressure relief film covers the first ventilation hole, and the ventilation film covers the second ventilation hole. The area of the first ventilation hole is larger than the area of the second ventilation hole.

[0030] Optionally, the breathable membrane is annular and covers all the second breathable holes; or, the breathable membrane is composed of a plurality of arcs and the plurality of breathable membranes are arranged circumferentially at intervals, and each arc-shaped breathable membrane covers at least one of the second breathable holes.

[0031] Through the above technical scheme, the composite explosion-proof membrane assembly can be supported to a certain extent through the setting of the supporting structure, which is beneficial to increasing the stability of the installation of the composite explosion-proof membrane assembly to avoid the formation of negative pressure in the pressure relief channel of the explosion-proof valve (for example, the pressure in the explosion-proof valve decreases due to the decrease in temperature). Under the action of negative pressure, the elastic pressure relief membrane is excessively concave and damaged, or excessively stretched in the direction of the pressure relief channel, affecting the pressure relief effect and response time of the elastic pressure relief membrane; at the same time, the supporting structure is also provided with a first air hole for the gas pressure in the pressure relief channel to act on the elastic pressure relief membrane, and a second air hole is provided for the gas in the pressure relief channel to act on the breathable membrane, so that the setting of the supporting structure will not affect the explosion-proof pressure relief effect and daily ventilation effect of the explosion-proof valve, so that the supporting structure can ensure the ventilation effect and explosion-proof effect of the explosion-proof valve while having good support.

[0032] In addition, the area of the first air hole in the above scheme is larger than that of the second air hole. On the one hand, the elastic pressure relief membrane has a larger contact area with the air flow in the pressure relief channel, so that when the pressure in the pressure relief channel increases, the elastic pressure relief membrane can respond quickly and deform, and produce a sudden change and rupture to relieve pressure when the explosion deformation height is reached, so that the explosion-proof valve can respond quickly; on the other hand, the area of the first air hole is large enough, so that after the elastic pressure relief membrane ruptures, the pressure relief channel has sufficient air permeability area, so that the explosion-proof valve has a sufficiently large air permeability after the explosion, which is convenient for the explosion-proof valve to quickly relieve pressure and ensure its explosion-proof effect.

[0033] Preferably, the ratio of the area of the first air holes to the area of the effective force-bearing region of the elastic pressure relief membrane is 0.3-0.7; the ratio of the area of the second air holes to the effective air permeability area of the air permeable membrane is 0.2-0.6.

[0034] Through the above technical scheme, the ratio of the area of the first air hole to the effective force-bearing area of the elastic pressure relief membrane is reasonably set, which can ensure the supporting effect of the supporting structure on the elastic pressure relief membrane while ensuring that the elastic pressure relief membrane has sufficient force-bearing area, so that the elastic pressure relief membrane can respond quickly when it is under pressure; the ratio of the second air hole to the effective air permeable area of the air permeable membrane is reasonably set, which can ensure the supporting effect on the air permeable membrane while ensuring the air permeability of the explosion-proof valve.

[0035] Preferably, the breathable membrane comprises a waterproof breathable layer and a support layer, the waterproof breathable layer is located on the side of the breathable membrane close to the external environment, and the support layer is located on the side of the breathable membrane away from the external environment; a protective net is provided on the side of the elastic pressure relief membrane away from the external environment.

[0036] Through the above technical solution, the breathable membrane is formed by combining a waterproof breathable layer and a support layer, which can form a composite membrane structure with higher strength and stronger hydrostatic pressure resistance, enabling the waterproof membrane to meet the waterproof performance requirements. In addition, the support layer can space the breathable membrane from the rigid support structure, alleviating the wear problems caused by the concave deformation of the breathable membrane due to vibration, internal negative pressure, etc. In addition, in this solution, the protective net is arranged on the side of the elastic pressure relief membrane facing away from the external environment, so that when the elastic pressure relief membrane deforms towards the side away from the external environment, it can be supported by the protective net, preventing the elastic pressure relief membrane from directly contacting the rigid support structure when deforming towards the side away from the external environment, and further avoiding the shear force exerted by the support structure when the elastic pressure relief membrane is excessively deformed towards the side away from the external environment, thereby improving the service life of the elastic pressure relief membrane.

[0037] Preferably, a pressure ring for pressing the elastic pressure relief membrane is arranged in the valve seat. The pressure ring presses on the outer edge of the elastic pressure relief membrane, and a plurality of connecting rib strips are connected to the pressure ring. The ends of the connecting rib strips away from the pressure ring are connected to the inner wall of the valve seat.

[0038] Through the above technical solution, in this application, the elastic pressure relief membrane has a significantly larger deformation ability compared to common breathable membranes. A larger deformation amount of the elastic pressure relief membrane often means that the edge bonding area of the elastic pressure relief membrane is more likely to peel off (whether it is adhesive peeling or hot melt connection peeling). Once local peeling occurs, it will not only affect the deformation uniformity of the elastic pressure relief membrane, thereby affecting the blasting response speed of the elastic pressure relief membrane, but in severe cases, it will also cause local leakage. Premature but small-scale pressure relief will make it difficult to burst in time when the blasting pressure is reached. The pressure ring is used to press the edge area of the elastic pressure relief membrane. At the same time, the pressure ring is also connected to the valve seat through a plurality of connecting rib strips. On the one hand, the stably installed pressure ring presses the elastic pressure relief membrane, which can further increase the installation stability of the elastic pressure relief membrane. When it is deformed under pressure, its edge can be pressed by the pressure ring, and the stress area of the elastic pressure relief membrane with the edge pressed will be concentrated in the middle position, reducing the response time of the elastic pressure relief membrane. On the other hand, the connecting rib strips can press the breathable membrane to ensure its flatness, avoiding the influence of the deformation of the breathable membrane on its air permeability and waterproof effect. At the same time, the connecting rib strips can apply a certain pressure to the breathable membrane. When the breathable membrane is set as a composite membrane, it can prevent its peeling and delamination.

[0039] Preferably, the initial air permeability of the explosion-proof valve is not less than 500 ml / min@1 kpa, and the waterproof performance level of the explosion-proof valve is IPX5 or IPX6 or IPX7 or IPX8.

[0040] Through the above technical solution, reasonably setting the initial air permeability of the explosion-proof valve can ensure the air permeability performance before the explosion-proof valve explodes. At the same time, reasonably setting the waterproof performance of the explosion-proof valve can not only ensure the waterproof effect of the explosion-proof valve, but also avoid excessive air permeability of the explosion-proof valve, which affects its explosion-proof effect.

[0041] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0042] 1. By introducing a membrane assembly structure with a specific structure into the explosion-proof valve and using a breathable membrane and an elastic pressure relief membrane in combination, on the basis of ensuring the effect of balancing the internal and external pressures during daily use, the corresponding time can be significantly reduced, enabling the explosion-proof valve to respond quickly and relieve pressure by explosion in a timely manner; specifically, the elastic membrane with a small thickness and large deformation under a small pressure is combined with the breathable membrane as a complete membrane assembly, and neither of them can be missing to enable the explosion-proof valve to have both a quick response and a good daily balanced air pressure effect.

[0043] 2. By further controlling the ratio of the blasting deformation height h of the elastic pressure relief membrane to the deformation height H of the elastic pressure relief membrane under a small pressure, it is ensured that the explosion-proof valve has a further optimized blasting response time and blasting stability.

[0044] 3. Scratches are provided on at least one side surface of the elastic pressure relief membrane. On the one hand, it can reduce the thickness of the elastic pressure relief membrane itself, facilitating the deformation of the elastic pressure relief membrane. On the other hand, when the elastic pressure relief membrane is deformed under pressure, a protrusion will first form at the position of the scratch, and as the internal pressure of the explosion-proof valve increases, the protrusion also increases until the scratch ruptures, and a large amount of gas in the explosion-proof valve gushes out at the scratch, causing the elastic pressure relief membrane to burst; when a puncturing member is provided on the inner wall of the valve cover, when the elastic pressure relief membrane deforms to a certain height, it will contact the puncturing member, and at this time, the elastic pressure relief membrane has undergone a certain deformation and has a small thickness. When contacting the puncturing member at this time, it can burst quickly, so that the explosion-proof valve has a low response time and can quickly relieve pressure to ensure the safety of the explosion-proof valve.

[0045] 4. The provision of the support structure can provide a certain support for the composite explosion-proof film assembly, which is beneficial to increasing the installation stability of the composite explosion-proof film assembly. When a negative pressure is formed in the pressure relief channel of the explosion-proof valve (for example, the pressure inside the explosion-proof valve decreases due to a decrease in temperature), it can prevent the elastic pressure relief film from being excessively concave and damaged or excessively stretched towards the pressure relief channel under the action of the negative pressure, thus affecting the pressure relief effect and response time of the elastic pressure relief film. At the same time, the area of the first ventilation hole is larger than that of the second ventilation hole. On the one hand, this enables the elastic pressure relief film to have a larger contact area with the airflow in the pressure relief channel. As a result, when the pressure in the pressure relief channel increases, the elastic pressure relief film can quickly respond and deform, and when it reaches the bursting deformation height, it will suddenly change and rupture for pressure relief, enabling the explosion-proof valve to quickly respond. On the other hand, the area of the first ventilation hole is large enough so that after the elastic pressure relief film ruptures, the pressure relief channel has sufficient ventilation area, allowing the explosion-proof valve to have a large enough ventilation volume after bursting, facilitating the rapid pressure relief of the explosion-proof valve to ensure its explosion-proof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0047] Figure 1 Structural schematic diagram of the first embodiment of the present invention.

[0048] Figure 2 is Figure 1 sectional view of

[0049] Figure 3 is Figure 1 structural schematic diagram from another perspective.

[0050] Figure 4 Structural schematic diagram of the composite explosion-proof film assembly.

[0051] Figure 5 Structural schematic diagram of the second embodiment of the present invention.

[0052] Figure 6 is Figure 5 structural schematic diagram of the elastic pressure relief film in

[0053] Explanation of reference numerals:

[0054] 1. Valve body; 11. Valve seat; 12. Valve cover; 13. Pressure relief channel; 2. Composite explosion-proof film assembly; 21. Breathable film; 211. Waterproof breathable layer; 212. Support layer; 22. Elastic pressure relief film; 221. Notch; 3. Piercing member; 31. Sharp part; 4. Support structure; 41. First breathable hole; 42. Second breathable hole; 5. Protection net; 6. Pressure ring; 61. Connecting rib; 7. Annular PET. Detailed implementation mode

[0055] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0056] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0057] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0058] Embodiment 1-1

[0059] See Figures 1 to 4 , the embodiment of the present invention provides an explosion-proof valve with a low response time, including a valve body 1 and a composite explosion-proof film assembly 2. The valve body 1 is mainly used to install the composite explosion-proof film assembly 2 and connect it to equipment (such as storage tanks, pipelines, battery packs, etc.). The composite explosion-proof film assembly 2 is mainly used for ventilation during normal use and blasting pressure relief when the pressure difference inside and outside the explosion-proof valve is too large.

[0060] See Figure 1 and Figure 2, in this example, the valve body 1 includes a valve seat 11 as an installation base, a valve cover 12 covering the valve seat 11, and a pressure relief channel 13 is provided inside the valve seat 11; the valve cover 12 can be installed on the valve seat 11 by means of snap connection, or it can also be installation methods such as bonding and welding. The valve seat 11 has a channel for exhausting gas; the composite explosion-proof membrane assembly 2 is arranged in the valve seat 11 and separates the pressure relief channel 13 from the external environment.

[0061] The composite explosion-proof membrane assembly 2 can be set to various structures, and it can achieve the conventional ventilation of the explosion-proof valve and quickly burst and relieve pressure when the pressure difference between the inside and outside of the explosion-proof valve is too large.

[0062] See Figure 2 , in this embodiment, the composite explosion-proof membrane assembly 2 includes a breathable membrane 21 that provides breathable ability and an elastic pressure relief membrane 22 that deforms under pressure. Among them, the breathable effect of the breathable membrane 21 is better than that of the elastic pressure relief membrane 22, so that the breathable membrane 21 can maintain the breathable effect during the daily use of the explosion-proof valve, while the elastic pressure relief membrane 22 can burst when the pressure difference between the pressure relief channel 13 and the external environment reaches the preset bursting pressure, meeting the explosion-proof effect of the explosion-proof valve. The elastic pressure relief membrane is relatively dense and has basically no breathable amount; on the one hand, the relatively dense elastic pressure relief membrane can have better waterproof performance, without worrying about the waterproof problem due to a certain breathable amount of the elastic pressure relief membrane before bursting. Secondly, there is no need to worry about certain chemicals passing through the elastic pressure relief membrane; on the other hand, compared with the elastic pressure relief membrane with a certain breathable amount, the relatively dense elastic pressure relief membrane has a larger deformation amount and a relatively faster response when dealing with the same air flow pressure.

[0063] Since the design of the material, size parameters (such as thickness, stress area, etc.), deformation performance, etc. of the elastic pressure relief membrane 22 will directly affect the response time and safety of the explosion-proof valve. In order to make the explosion-proof valve have both low response time and safety, in this embodiment, the elastic pressure relief membrane 22 is correspondingly set.

[0064] Specifically, in order to endow the explosion-proof valve with both a low response time and a high instantaneous pressure relief capacity, the thickness of the elastic pressure relief membrane 22 is set to 98 μm; the deformation height H of the elastic pressure relief membrane 22 is 7.5 mm @ 2 kPa, that is, when the internal and external pressure difference of the explosion-proof valve is 2 kPa, the deformation height of the elastic pressure relief membrane 22 is 7.5 mm. In this embodiment, the bursting pressure of the explosion-proof valve is about 7 kPa, that is, the test pressure is about 28.6% of the bursting pressure; at the same time, the bursting deformation height h of the elastic pressure relief membrane 22 is greater than the deformation height H of the elastic pressure relief membrane 22, and h is set to 20 mm. When the pressure in the pressure relief channel 13 gradually increases, the elastic pressure relief membrane 22 will gradually deform (gradually change). At the same time, the thickness of the elastic pressure relief membrane 22 will also decrease with the increase of its deformation amount. When the internal and external pressure difference of the explosion-proof valve gradually increases and exceeds the pressure limit borne by the elastic pressure relief membrane 22, the elastic pressure relief membrane 22 is more likely to undergo rapid deformation (abrupt change), enabling it to undergo a large deformation and burst under the action of a small extrusion force, facilitating the rapid response of the explosion-proof valve when the pressure in its pressure relief channel 13 exceeds the preset bursting pressure, and endowing the explosion-proof valve with a low response time. In addition, since the elastic pressure relief membrane 22 bursts due to excessive deformation, the elastic pressure relief membrane 22 still has a large deformation tendency at the moment of bursting and is also subjected to a large impact force of the airflow, thereby making the size of the break generated by the elastic pressure relief membrane 22 relatively large, further facilitating the rapid pressure relief of the pressure relief channel 13, and enabling the explosion-proof valve in this embodiment to have both a low response time and a high instantaneous pressure relief capacity.

[0065] Furthermore, since the ratio between the deformation height H of the elastic pressure relief membrane 22 and the bursting deformation height h directly affects the response time and explosion-proof effect of the explosion-proof valve, when the ratio of the bursting deformation height h to the deformation height H of the elastic pressure relief membrane 22 is too small, the elastic pressure relief membrane 22 is likely to burst before reaching the preset bursting pressure, thereby affecting the service life of the explosion-proof valve; when the ratio of the bursting deformation height h to the deformation height H of the elastic pressure relief membrane 22 is too large, the elastic pressure relief membrane 22 cannot burst quickly when the explosion-proof valve reaches the preset bursting pressure, resulting in an extended response time and reduced safety of the explosion-proof valve, and even potentially causing the explosion-proof valve to fail. Therefore, in this embodiment, in order to further reduce the response time of the explosion-proof valve without affecting its explosion-proof effect, the ratio of the bursting deformation height h to the deformation height H of the elastic pressure relief membrane 22 is set to approximately 2.67, so that the elastic pressure relief membrane 22 can deform gradually when the pressure in the pressure relief channel 13 changes. During this process, the thickness of the elastic pressure relief membrane 22 can gradually decrease, providing a basis for it to burst when it exceeds the preset pressure limit. Until the amount of deformation exceeds the deformation height H of the elastic pressure relief membrane 22, there is a sudden change process during the continuous deformation of the elastic pressure relief membrane 22, and finally it ruptures when the amount of deformation reaches the bursting deformation height h, which can not only ensure that the elastic pressure relief membrane 22 can respond quickly and rupture when the pressure difference inside and outside the explosion-proof valve exceeds the preset limit, but also ensure that it is not easy to rupture when the actual amount of deformation is within the deformation height H range, thus ensuring its service life.

[0066] Furthermore, the thickness and deformation performance of the elastic pressure relief membrane 22 also affect the response time and safety of the explosion-proof valve. In order to ensure a low response time, high explosion-proof effect, and high safety of the explosion-proof valve, in this embodiment, the ratio of the bursting deformation height h to the thickness of the elastic pressure relief membrane 22 is set to approximately 204.

[0067] In addition, since the deformation space of the elastic pressure relief membrane 22 is large enough, its effective stress-bearing area is also larger, and it is easier to deform when there is a pressure difference inside and outside the explosion-proof valve. Therefore, in order to ensure that the deformation space of the elastic pressure relief membrane 22 is large enough, in this embodiment, the area of the effective stress-bearing area of the elastic pressure relief membrane 22 is 490.6 mm 2 , and the distance between the edge of the effective stress-bearing area of the elastic pressure relief membrane 22 and the inner peripheral wall of the valve seat 11 is 12.5 mm.

[0068] See Figure 2, in order to further reduce the response time of the elastic pressure relief membrane 22, in this embodiment, a puncturing member 3 is provided on the inner wall of the valve cover 12, and one or two sharp portions 31 are provided at one end of the puncturing member 3 facing away from the valve cover 12. When the elastic pressure relief membrane 22 deforms to a certain height, it will contact the puncturing member 3. At this time, the elastic pressure relief membrane 22 has undergone a certain deformation, with a smaller thickness, and a tensile force along the membrane end face will be generated on the elastic pressure relief membrane 22. At this time, when the elastic pressure relief membrane 22 contacts the puncturing member 3, it can burst quickly, further reducing the response time of the explosion-proof valve. At the same time, after the elastic pressure relief membrane 22 bursts, it will be further stretched and broken, so that the explosion-proof valve can quickly relieve pressure to ensure safety.

[0069] See Figure 2 and Figure 3 , in order to achieve the stable installation of the composite explosion-proof membrane assembly 2, to avoid the formation of negative pressure in the pressure relief channel 13 of the explosion-proof valve (for example, the pressure inside the explosion-proof membrane decreases due to temperature reduction), the elastic pressure relief membrane 22 is overly concave and damaged or overly stretched in the direction of the pressure relief channel 13 under the action of negative pressure, affecting the pressure relief effect and response time of the elastic pressure relief membrane 22; in this embodiment, a support structure 4 for installing and supporting the composite explosion-proof membrane assembly 2 is provided in the valve seat 11. The support structure 4 is provided with a first air vent 41 and a second air vent 42. The elastic pressure relief membrane 22 covers the first air vent 41, and the air-permeable membrane 21 covers the second air vent 42, so as to realize the stable support of the composite explosion-proof membrane assembly 2 while not affecting the air permeability and pressure relief performance of the composite explosion-proof membrane assembly 2.

[0070] Furthermore, in this embodiment, the area of the first air vent 41 is larger than the area of the second air vent 42. On the one hand, it makes the elastic pressure relief membrane 22 have a larger contact area with the airflow in the pressure relief channel 13. Therefore, when the pressure in the pressure relief channel 13 increases, the elastic pressure relief membrane 22 can quickly respond and deform, and generate a sudden change and rupture to relieve pressure when reaching the bursting deformation height, so that the explosion-proof valve can quickly respond; on the other hand, the area of the first air vent 41 is large enough, so that after the elastic pressure relief membrane 22 ruptures, the pressure relief channel 13 has enough air permeability area, so that the explosion-proof valve has a large enough air permeability after bursting, facilitating the explosion-proof valve to quickly relieve pressure to ensure its explosion-proof effect.

[0071] Even further, in this embodiment, the ratio of the area of the first air vent 41 to the effective stress area of the elastic pressure relief membrane 22 is set to 0.48; the ratio of the area of the second air vent 42 to the effective air permeability area of the air-permeable membrane 21 is 0.4, so as to ensure the support effect on the composite explosion-proof membrane assembly 2 while not affecting the air permeability and pressure relief performance of the composite explosion-proof membrane assembly 2.

[0072] There are various ways of matching the air-permeable membrane 21 and the elastic pressure relief membrane 22 of the composite explosion-proof membrane assembly 2. SeeFigure 4 In this embodiment, the breathable membrane 21 is disposed around the outer periphery of the elastic pressure relief membrane 22. When the explosion-proof valve reaches the preset bursting pressure, the air flow pressure is concentrated at the central position of the valve body 1 (i.e., directly below the elastic pressure relief membrane 22), which facilitates the rapid deformation and rupture of the elastic pressure relief membrane 22 and reduces the response time of the explosion-proof valve.

[0073] In this embodiment, the breathable membrane 21 specifically includes a waterproof breathable layer 211 and a support layer 212. The waterproof breathable layer 211 is located on the side of the breathable membrane 21 close to the external environment, and the support layer 212 is located on the side of the breathable membrane 21 away from the external environment. Of course, the breathable membrane 21 may also include only the waterproof breathable layer 211, and the support layer 212 can preferably improve the service life of the waterproof breathable layer 211. Among them, the waterproof breathable layer 211 can adopt a PTFE breathable membrane, and the support layer 212 can be set as a non-woven fabric layer. The non-woven fabric layer can select a PET material with better antioxidant performance. The air permeability of the PTFE membrane is about 6000 ml / min / cm 2 @7 kPa, and the air permeability of the composite membrane formed by the PTFE membrane and the PET membrane is about 7000 ml / min / cm 2 @7 kPa. The combination of the two can form a composite membrane with better oil repellency performance, which can reduce the influence of water vapor on the air permeability to a certain extent, so it has a larger air permeability than the PTFE single membrane. In addition, it can also ensure its good waterproof performance (such as meeting the IP7 waterproof performance). The elastic pressure relief membrane 22 can adopt a soft membrane such as a latex membrane or a PDMS membrane. Specifically, in this embodiment, a latex membrane is used, and the elastic pressure relief membrane 22 is located on the side of the waterproof breathable layer 211 away from the support layer 212. The periphery of the elastic pressure relief membrane 22 is adhered to the waterproof breathable layer 211 with glue. On the one hand, it can ensure the adhesion effect of the two, and on the other hand, it can avoid liquid leakage at the adhesion part of the two.

[0074] Furthermore, since the elastic pressure relief membrane 22 is relatively fragile and more likely to be damaged, in order to avoid the influence of the shear force exerted by the support structure 4 when the elastic pressure relief membrane 22 deforms excessively towards the side away from the external environment, in this embodiment, a protective net 5 is provided on the side of the elastic pressure relief membrane 22 away from the external environment. The protective net 5 is adhered to the end face of the support layer 212 away from the waterproof breathable layer 211 with glue. Thus, when the elastic pressure relief membrane 22 deforms towards the side away from the external environment, it can be supported by the protective net 5, avoiding direct contact between the elastic pressure relief membrane 22 and the support structure 4 when deforming towards the side away from the external environment, and further avoiding the shear force exerted by the support structure 4 when the elastic pressure relief membrane 22 deforms excessively towards the side away from the external environment, so as to improve the service life of the elastic pressure relief membrane 22.

[0075] See Figure 2 and Figure 4In order to further increase the installation stability of the composite explosion-proof membrane assembly 2, in this embodiment, a pressure ring 6 for pressing the elastic pressure relief membrane 22 is provided in the valve seat 11, and one, two or more connecting ribs 61 are connected to the pressure ring 6, and the end of the connecting rib 61 away from the pressure ring 6 is connected to the valve seat 11. On the one hand, the stably installed pressure ring 6 presses the elastic pressure relief membrane 22, which can further increase the stability of the installation of the elastic pressure relief membrane 22, so that when it is deformed by pressure, its edge can be pressed by the pressure ring 6, and the force-bearing area of the elastic pressure relief membrane 22 with the pressed edge will be concentrated in its middle position, and the deformation uniformity is higher, and it is not easy to cause deformation deviation due to local peeling and the like, thereby reducing the response time of the elastic pressure relief membrane 22; on the other hand, the connecting ribs 61 can press the breathable membrane 21 to ensure the flatness of the breathable membrane 21 and prevent the deformation of the breathable membrane 21 from affecting its ventilation effect. At the same time, the connecting ribs 61 can apply a certain pressure to the breathable membrane 21, and since the breathable membrane 21 is configured as a composite membrane, it can prevent its peeling and delamination to cause leakage (that is, prevent the waterproof breathable layer 211 and the support layer 212 from delaminating).

[0076] Furthermore, in order to prevent the elastic pressure relief membrane 22 from being damaged when the pressure ring 6 presses the elastic pressure relief membrane 22, in the present embodiment, an annular PET 7 is provided on the side of the elastic pressure relief membrane 22 facing the pressure ring 6, thereby preventing the elastic pressure relief membrane 22 (latex membrane) from being directly contacted and pressed by the pressure ring 6 and causing damage to the elastic pressure relief membrane 22 (latex membrane).

[0077] In addition, in order to ensure the waterproof effect of the explosion-proof valve while avoiding excessive air permeability of the explosion-proof valve which would affect its explosion-proof effect, in this embodiment, the initial air permeability of the explosion-proof valve is not less than 500ml / min@1kpa, and the waterproof performance level of the explosion-proof valve is IPX5 or IPX6 or IPX7 or IPX8.

[0078] The explosion response time of the explosion-proof valve in this embodiment is no more than 1 s (actual instantaneous explosion), and can pass the vibration test.

[0079] The explosion-proof valve structure and the composite explosion-proof membrane assembly are adjusted in Examples 1-2 and 1-3, as shown in Table 1 for details.

[0080] The explosion response time of the explosion-proof valves in Examples 1-2 and 1-3 is no more than 1 s (actual instantaneous explosion), and can pass the vibration test.

[0081] Example 2-1

[0082] See also Figure 5 and Figure 6, The main difference between this embodiment and Embodiments 1-2 is that in this embodiment, a puncturing member 3 is not provided on the valve cover 12, but a notch 221 is provided on the surface of the elastic pressure relief membrane 22 facing away from the pressure relief channel 13. Specifically, the ratio of the depth of the notch 221 to the thickness of the elastic pressure relief membrane 22 is 0.5. This setting can, on the one hand, reduce the thickness of the elastic pressure relief membrane 22 itself, facilitating the deformation of the elastic pressure relief membrane 22. On the other hand, when the elastic pressure relief membrane 22 is deformed under pressure, a bulge will first form at the position of the notch 221, and as the pressure inside the explosion-proof valve increases, the bulge also increases until the notch 221 ruptures, and a large amount of gas in the explosion-proof valve gushes out at the scratch, causing the elastic pressure relief membrane 22 to burst, further reducing the response time of the explosion-proof valve. Of course, in other embodiments, the notch 221 can also be provided on both opposite end faces of the elastic pressure relief membrane 22, or only on the side of the elastic pressure relief membrane 22 close to the pressure relief channel 13, which can be freely set according to actual needs.

[0083] Embodiment 2-2

[0084] The main difference between Embodiment 2-2 and Embodiment 1-3 is that in this embodiment, a puncturing member 3 is not provided on the valve cover 12, but a notch 221 is provided on the surface of the elastic pressure relief membrane 22 facing away from the pressure relief channel 13. For specific settings, see Table 1.

[0085] Embodiment 3-1

[0086] The main difference between Embodiment 3-1 and Embodiment 1-1 is that in this embodiment, the elastic pressure relief membrane 22 is made of PDMS membrane.

[0087] The explosion-proof valve burst response times in Embodiment 2-1, Embodiment 2-2, and Embodiment 3-1 are all no greater than 1 s (actual instantaneous burst), and can pass the vibration test.

[0088] Table 1 Parameter Table of Each Embodiment

[0089]

[0090] Comparative Example

[0091] Comparative Example 1

[0092] The main difference between this comparative example and Example 1-1 is that the composite explosion-proof membrane assembly 2 in Example 1 is replaced with a PTFE breathable membrane, and the diameter of the PTFE breathable membrane is the same as the outer diameter of the breathable membrane 21 in Example 1. Further, the distance between the PTFE breathable membrane and the piercing member 3 (i.e., the blasting deformation height h) is set to 1.5 mm. In addition, a PTFE breathable membrane with a higher looseness than that in Example 1 is selected in this comparative example, and the initial gas permeability of the explosion-proof valve in this comparative example is 9675 ml / min@1 kpa. The deformation height H of the explosion-proof valve in this comparative example is less than 1 mm under a test pressure of 2 kPa.

[0093] The blasting response time of the explosion-proof valve in this comparative example is 1.8 s, and the blasting response time is too long; and the blasting pressure drops significantly after the vibration test, so it fails the vibration test.

[0094] Comparative Example 2

[0095] The difference between Comparative Example 2 and Comparative Example 1 is only that a PTFE breathable membrane with a lower looseness is selected, and the initial gas permeability of the explosion-proof valve in this comparative example is 4514 ml / min@1 kpa. The deformation height H of the explosion-proof valve in this comparative example is less than 1 mm under a test pressure of 2 kPa.

[0096] The blasting response time of the explosion-proof valve in this comparative example is 2.6 s, and the blasting response time is too long; but it can pass the vibration test.

[0097] The performance test method is as follows:

[0098] 1. Blasting performance test

[0099] 1.1 Blasting pressure

[0100] When testing the blasting pressure of the explosion-proof valve, use the explosion-proof valves in each example and comparative example as test samples, and preset the gas source pressure. Then connect the explosion-proof valve to the gas source and observe whether it explodes. Increase the preset pressure of the gas source in a gradient of 0.1 kpa, repeat the above operation until the explosion-proof valve explodes, and record the preset pressure of the gas source at this time, which is the blasting pressure of the explosion-proof valve.

[0101] 1.2 Blasting response time test

[0102] On the premise of determining the blasting pressure of the explosion-proof valve, repeat the steps in 1.1. At this time, record the time between connecting the explosion-proof valve to the gas source and the explosion of the explosion-proof valve, in seconds, which is the blasting response time of the explosion-proof valve. If the blasting response time of the explosion-proof valve is greater than 1 s, it is considered that the blasting response time is unqualified.

[0103] 2. Vibration test

[0104] The test method for vibration test refers to ISO-16750-3 Road vehicles - Electrical and electronic equipment - Environmental conditions and testing - Part 3: Mechanical loads; specifically, sinusoidal vibration: the frequency is (100 - 440) Hz, the maximum acceleration is 60 m / s2, and the test duration is 42 h; random vibration: the frequency is (10 - 2000) Hz, the PSD is 10 (m / s2)2 / Hz, and the test duration is 42 h. After the vibration test, the bursting pressure of the explosion-proof valve is tested. If the bursting pressure drops before and after the vibration test, it is considered that the vibration test fails.

[0105] The above-mentioned embodiments are only the preferred embodiments of the present invention, and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. An explosion-proof valve with low response time, characterized in that, Comprising: A valve body, including a valve seat serving as an installation base and a valve cover covering the valve seat, and a pressure relief passage is provided inside the valve seat; A composite explosion-proof membrane assembly, disposed inside the valve seat and separating the pressure relief passage from the external environment, including a breathable membrane providing breathability and an elastic pressure relief membrane that deforms under pressure, and the breathable membrane is annularly disposed around the outer periphery of the elastic pressure relief membrane; The thickness of the elastic pressure relief membrane is 50 - 200 μm, the deformation height H of the elastic pressure relief membrane at a test pressure of 2 kPa is 3 - 10 mm, and the test pressure is 10% - 40% of the bursting pressure of the explosion-proof valve; The bursting deformation height h of the elastic pressure relief membrane is 10 - 30 mm.

2. The explosion-proof valve with low response time according to claim 1, characterized in that, The area of the effective force-bearing region of the elastic pressure relief membrane is 250 to 750 mm 2 , and the distance between the edge of the effective force-bearing region of the elastic pressure relief membrane and the inner peripheral wall of the valve seat is 5 to 25 mm.

3. The explosion-proof valve with low response time according to claim 1, characterized in that, The ratio of the bursting deformation height h of the elastic pressure relief membrane to the deformation height H of the elastic pressure relief membrane is 1.5 - 4.

5.

4. The explosion-proof valve with low response time according to claim 1, characterized in that, The ratio of the bursting deformation height h of the elastic pressure relief membrane to the thickness of the elastic pressure relief membrane is 50 - 600.

5. The explosion-proof valve with low response time according to claim 1, characterized in that, At least one side surface of the elastic pressure relief membrane is provided with a notch, and the ratio of the depth of the notch to the thickness of the elastic pressure relief membrane is 0.1 - 0.5; or, A puncturing member is provided on the inner wall of the valve cover, and at least one sharp portion is provided at one end of the puncturing member facing away from the valve cover.

6. The explosion-proof valve with low response time according to claim 1, characterized in that, A support structure for installing and supporting the composite explosion-proof membrane assembly is provided inside the valve seat, and a first air-permeable hole and a second air-permeable hole are provided on the support structure. The elastic pressure relief membrane covers the first air-permeable hole, the breathable membrane covers the second air-permeable hole, and the area of the first air-permeable hole is larger than the area of the second air-permeable hole.

7. The explosion-proof valve with low response time according to claim 6, characterized in that, The ratio of the area of the first air-permeable hole to the effective stress-bearing area of the elastic pressure relief membrane is 0.3 - 0.7; the ratio of the area of the second air-permeable hole to the effective breathable area of the breathable membrane is 0.2 - 0.

6.

8. The explosion-proof valve with low response time according to claim 1, characterized in that, The breathable membrane includes a waterproof breathable layer and a support layer. The waterproof breathable layer is located on the side of the breathable membrane close to the external environment, and the support layer is located on the side of the breathable membrane facing away from the external environment; a protective net is provided on the side of the elastic pressure relief membrane facing away from the external environment.

9. The explosion-proof valve with low response time according to claim 1, characterized in that, A pressing ring for pressing the elastic pressure relief membrane is provided inside the valve seat. The pressing ring presses the outer edge of the elastic pressure relief membrane, and a plurality of connecting ribs are connected to the pressing ring. One end of the connecting ribs facing away from the pressing ring is connected to the inner wall of the valve seat.

10. The explosion-proof valve with low response time according to claim 1, characterized in that, The initial air permeability of the explosion-proof valve is not less than 500 ml / min@1 kPa, and the waterproof performance level of the explosion-proof valve is IPX5 or IPX6 or IPX7 or IPX8.

Images