Anti-freezing anti-explosion valve

Abstract

The anti-freezing anti-explosion valve comprises a valve body, a piston and an end cover arranged at the upper end of the piston, the size of the end cover is larger than that of the piston, the outer edge of the end cover protrudes out of the outer side face of the piston, and the end cover covers a gap between a containing groove in the upper end of the valve body and the outer side face of the piston. The outer edge of the end cover further extends and is bent downwards to form a shielding part, the shielding part covers the periphery of the upper end of the valve body and forms a first interval, and a second interval is formed between the inner side face of the shielding part and the outer side face of the piston, so that dust and other foreign matter can be effectively prevented from entering the gap, and the excellent dust prevention and foreign matter prevention effects are achieved. Therefore, the normal use of the opening pressure-relief explosion-proof function of the explosion-proof valve is ensured; meanwhile, water can be prevented from entering the gap, so that the phenomena that the piston cannot be opened and the pressure relief explosion-proof function fails due to the fact that accumulated water is frozen in a low-temperature environment can be effectively avoided, the purpose of preventing freezing is achieved, and normal implementation of the explosion-proof function is guaranteed.

Description

Technical field:

[0001] The utility model relates to the technical field of explosion-proof valve products, in particular to an explosion-proof valve capable of preventing freezing. Background technology:

[0002] With the rapid growth of electric vehicle ownership in my country, electric vehicle fire accidents have occurred frequently, and the safety of electric vehicles has always been the focus of consumers. For this reason, relevant departments have recently issued a series of mandatory national standards, among which the "Electric Vehicle Safety Requirements" mainly stipulates the electrical safety and functional safety requirements of electric vehicles, strengthens the waterproof, insulation resistance and monitoring requirements of the whole vehicle, so as to reduce the safety risks of vehicles in normal use and wading; in response to the issuance and implementation of the above mandatory national standards, higher requirements are put forward for the waterproof and explosion-proof of the power system of new energy vehicles.

[0003] The safe and reliable operation of the core components of the electric vehicle power system, such as the battery PACK, electronic control, and motor, is crucial. To ensure its safe and stable operation, the current solution is to install a corresponding number of explosion-proof valve products on the battery pack to meet the needs of waterproofing, explosion-proofing, and exhaust pressure relief of the power battery system, but the conventional explosion-proof valve products do not have the function of drainage; when the battery cells in the battery pack explode, burn, or other thermal runaway abnormalities occur, a large amount of high-temperature gas, flame, flame, gas-solid mixture, etc. will be generated. At this time, the high-temperature gas, flame, flame, etc. may be discharged to the combustibles and flammables in the vehicle due to the non-directional exhaust pressure relief of the explosion-proof valve, thereby igniting the vehicle or causing more serious accidents.

[0004] The Chinese utility model patent with authorization announcement number CN221805769U discloses an explosion-proof valve, a battery box, a battery and an electrical device, wherein the explosion-proof valve has a first side and a second side opposite to each other along a first direction, and the explosion-proof valve includes a valve body and a switch assembly with a gas permeable passage. The first side of the valve body is provided with a mounting groove and a mounting passage that penetrates the valve body along a first direction. The mounting passage is connected to the mounting groove. The switch assembly includes an end cover, a piston and a push rod connected to the piston. The push rod is slidably disposed in the mounting channel. The piston is disposed in the mounting groove. The end cover is disposed on the first side of the piston. Among them, a groove is provided on the side of the end cover facing the piston, and a gas passage communicating with the outside is defined between the groove and the piston. The gas passage constitutes a part of the gas permeable passage. In combination with this patent (CN221805769U) Figure 5As can be seen from FIG. 6, the outer dimensions of the end cover are basically the same as those of the piston, and there is a gap between it and the upper accommodation groove of the valve body. This will cause the following problems: Since the end cover does not cover the upper end face of the piston nor the upper accommodation groove of the valve body, it is not only easy for dust and other foreign matters to enter through the gap. If dust and other foreign matters accumulate for a long time, or large particles get stuck in this gap, it will affect the piston's outward movement relative to the valve body to open, resulting in an impact on the explosion-proof valve's function of opening, relieving pressure, and explosion-proof. Moreover, the end cover and the gap formed between it and the upper accommodation groove of the valve body are prone to water accumulation, and it will freeze in a low-temperature environment, which causes the piston to be unable to open and the explosion-proof and pressure-relieving function to fail.

[0005] In view of this, the inventor of the present invention proposes the following technical solutions. Utility Model Content:

[0006] The purpose of the present utility model is to overcome the deficiencies of the prior art and provide an explosion-proof valve that can prevent freezing.

[0007] To solve the above technical problems, the present utility model adopts the following technical solutions: The explosion-proof valve that can prevent freezing includes a valve body, a piston that is installed in the accommodation groove of the valve body in a slidable up and down manner and can close the pressure relief channel of the valve body, and an end cover provided at the upper end of the piston. The size of the end cover is larger than that of the piston, so that the outer edge of the end cover protrudes beyond the outer side surface of the piston and covers the gap between the upper accommodation groove of the valve body and the outer side surface of the piston. The outer edge of the end cover further extends and is bent downward to form a shielding portion. The shielding portion covers the periphery of the upper end of the valve body and forms a first interval, and a second interval is formed between the inner side surface of the shielding portion and the outer side surface of the piston.

[0008] Furthermore, in the above technical solution, the cross-section of the shielding portion is in the shape of a trumpet with a larger upper part and a smaller lower part, so that the outer surface of the shielding portion is an inclined surface.

[0009] Furthermore, in the above technical solution, the cross-section of the shielding portion is in the shape of a straight cylinder.

[0010] Furthermore, in the above technical solution, a convex portion that protrudes upward is provided in the middle of the upper end of the valve body. The accommodation groove is provided on the convex portion. The end cover covers the upper end of the convex portion, and a third interval that communicates the second interval and the first interval is formed between the end cover and the upper end of the convex portion. The shielding portion covers the outside of the periphery of the convex portion and forms the first interval, so that an upper and lower staggered structure is formed between the upper end of the convex portion and the lower end of the shielding portion.

[0011] Furthermore, in the above technical solution, a first groove is further provided in the accommodation groove. The upper sealing ring is inlaid and installed in the first groove, and the upper end of the upper sealing ring also protrudes outside the first groove to be in sealing contact with the piston.

[0012] Furthermore, in the above technical solution, a guide rod is provided at the lower end of the piston. A spring is sleeved outside the guide rod. The lower end of the spring contacts the flange at the lower end of the guide rod, and the upper end of the spring contacts the valve body. Under the action of the spring force, the piston abuts downward in the accommodation groove of the valve body to close the pressure relief channel of the valve body.

[0013] Furthermore, in the above technical solution, a stepped groove is opened downward along the upper end surface of the piston, and a first ventilation hole penetrating through the lower end of the piston is opened downward at the bottom of the stepped groove. The guide rod has a second ventilation hole penetrating through the upper and lower ends, and the second ventilation hole is communicated with the first ventilation hole. A waterproof breathable membrane is further arranged in the stepped groove, and the waterproof breathable membrane covers the first ventilation hole; an air permeable groove communicating the stepped groove with the second interval is further provided at the upper end of the piston, and the end cover covers the upper end of the air permeable groove to form an air permeable channel.

[0014] Furthermore, in the above technical solution, a pressing ring is fixedly embedded in the stepped groove, and the pressing ring presses the outer edge of the waterproof breathable membrane.

[0015] Furthermore, in the above technical solution, the lower end of the valve body has a threaded portion, and the outer periphery of the upper end of the valve body has a hexagonal nut portion.

[0016] Furthermore, in the above technical solution, a second groove is provided at the lower end of the valve body, and a lower sealing ring is embedded and installed in the second groove, and the lower end of the lower sealing ring also protrudes out of the second groove.

[0017] After adopting the above technical solution, the present utility model has the following beneficial effects compared with the prior art: The present utility model sets the end cover to be relatively large, so that the end cover not only covers the upper end surface of the piston, but also the outer edge of the cover protrudes beyond the outer side surface of the piston, and covers the gap between the accommodation groove at the upper end of the valve body and the outer side surface of the piston. Most importantly, the outer edge of the end cover also extends and is bent downward to form a shielding portion, and the shielding portion covers the outer periphery of the upper end of the valve body, so as to effectively prevent dust and other foreign matters from entering the gap between the accommodation groove at the upper end of the valve body and the outer side surface of the piston, achieving an excellent dust and foreign matter prevention effect, and further ensuring that the opening, pressure relief and explosion-proof functions of the explosion-proof valve can be used normally; at the same time, since the shielding portion of the end cover covers the outer periphery of the upper end of the valve body and forms a first interval, it can prevent water from entering the gap between the accommodation groove at the upper end of the valve body and the outer side surface of the piston, and further effectively prevent the phenomenon that water accumulates and freezes in a low-temperature environment, resulting in the piston being unable to open and the pressure relief and explosion-proof function failing, so as to achieve the purpose of preventing freezing and ensuring the normal realization of the explosion-proof function of the present utility model. Brief Description of the Drawings:

[0018] Figure 1 is a perspective view of the present utility model;

[0019] Figure 2It is a perspective view of another angle of the present utility model;

[0020] Figure 3 It is a sectional view of the present utility model;

[0021] Figure 4 It is a perspective view of the end cover of the present utility model;

[0022] Figure 5 It is an exploded perspective view of the present utility model. Specific embodiments:

[0023] The present utility model will be further described below in conjunction with specific embodiments and the accompanying drawings.

[0024] See Figures 1-5 As shown, it is an explosion-proof valve that can prevent freezing, which includes a valve body 1, a piston 2 installed in the accommodation groove 101 of the valve body 1 in a slidable up and down manner and capable of closing the pressure relief channel 102 of the valve body 1, and an end cover 3 arranged at the upper end of the piston 2. Among them, a guide rod 4 is arranged at the lower end of the piston 2, a spring 5 is sleeved outside the guide rod 4, the lower end of the spring 5 contacts the flange 41 at the lower end of the guide rod 4, the upper end of the spring 5 contacts the valve body 1, and under the elastic force of the spring 5, the piston 2 abuts downward in the accommodation groove 101 of the valve body 1 to close the pressure relief channel 102 of the valve body 1.

[0025] The present utility model has made the following improvements: The size of the end cap 3 is larger than that of the piston 2, so that the outer edge of the end cap 3 protrudes beyond the outer side surface of the piston 2 and covers the gap 103 between the accommodation groove 101 at the upper end of the valve body 1 and the outer side surface of the piston 2. The outer edge of the end cap 3 further extends and bends downward to form a shielding portion 31, and the shielding portion 31 covers the periphery of the upper end of the valve body 1 and forms a first interval 301 to ensure that the shielding portion 31 does not contact the periphery of the upper end of the valve body 1, thereby making the up-and-down movement of the piston 2 smoother, and a second interval 302 is formed between the inner side surface of the shielding portion 31 and the outer side surface of the piston 2. That is to say, the present utility model sets the end cap 3 to be larger, so that the end cap 3 not only covers the upper end surface of the piston 2, but also the outer edge of the end cap 3 protrudes beyond the outer side surface of the piston 2 and covers the gap 103 between the accommodation groove 101 at the upper end of the valve body 1 and the outer side surface of the piston 2. The most important thing is that the outer edge of the end cap 3 further extends and bends downward to form a shielding portion 31, and the shielding portion 31 covers the periphery of the upper end of the valve body 1, thereby effectively preventing dust and other foreign matters from entering the gap 103 between the accommodation groove 101 at the upper end of the valve body 1 and the outer side surface of the piston 2, achieving an excellent dust-proof and foreign matter-proof effect, and further ensuring that the opening, pressure relief and explosion-proof functions of the explosion-proof valve can be used normally; at the same time, since the shielding portion 31 of the end cap 3 covers the periphery of the upper end of the valve body 1 and forms a first interval 301, it can prevent water from entering the gap 103 between the accommodation groove 101 at the upper end of the valve body 1 and the outer side surface of the piston 2, and further effectively prevent the phenomenon that water accumulates and freezes in a low-temperature environment, resulting in the piston being unable to open and the pressure relief and explosion-proof function failing, thereby achieving the purpose of preventing freezing and ensuring the normal realization of the explosion-proof function of the present utility model.

[0026] The shielding portion 31 includes at least the following two shapes:

[0027] The first shape is: The cross-section of the shielding portion 31 is a flared shape with a larger upper part and a smaller lower part, so that the outer surface of the shielding portion 31 is an inclined surface.

[0028] The second shape is: The cross-section of the shielding portion 31 is a straight cylindrical shape.

[0029] As an effective embodiment, the shielding portion 31 adopts the above first shape, so that the outer surface of the shielding portion 31 is an inclined surface, and its drainage effect is better, so that water will not accumulate, further enhancing the antifreeze effect. At the same time, the dust-proof effect is also better, and it has a good guiding effect.

[0030] Among them, a convex part 11 protruding upward is provided in the middle of the upper end of the valve body 1. The accommodating groove 101 is provided in the convex part 11. The end cover 3 covers the upper end of the convex part 11, and a third interval 303 communicating the second gap and the first gap is formed between the end cover 3 and the upper end of the convex part 11. The shielding part 31 covers the outside of the periphery of the convex part 11 and forms the first interval 301, so that an up-and-down staggered structure is formed between the upper end of the convex part 11 and the lower end of the shielding part 31, which has a good dust-proof effect and can also effectively prevent foreign objects from entering.

[0031] A first groove 104 is further provided in the accommodating groove 101. The upper sealing ring 12 is inlaid and installed in the first groove 104, and the upper end of the upper sealing ring 12 also protrudes outside the first groove 104 to be in sealed contact with the piston 2, so as to effectively close the pressure relief channel 102 of the valve body 1 by the piston 2.

[0032] A stepped groove 21 is formed in the piston 2 along its upper end face downward, and a first ventilation hole 22 penetrating through the lower end of the piston 2 is formed downward at the bottom of the stepped groove 21. The guide rod 4 has a second ventilation hole 42 penetrating through the upper and lower ends. The second ventilation hole 42 is communicated with the first ventilation hole 22, and a waterproof and breathable membrane 6 is further provided in the stepped groove 21. The waterproof and breathable membrane 6 covers the first ventilation hole 22. A ventilation groove 23 communicating the stepped groove 21 and the second interval 302 is further provided at the upper end of the piston 2. The end cover 3 covers the upper end of the ventilation groove 23 to form a ventilation channel, so that the utility model also has the function of waterproof and ventilation. When the utility model is installed on products such as a battery pack box body, the internal air pressure of the battery pack box body can be communicated with the outside through the second ventilation hole 42 of the guide rod 4, the first ventilation hole 22 of the piston 2, the waterproof and breathable membrane 6, the ventilation groove 23, the second interval 302, and the first interval 301 to achieve the purpose of air pressure balance. At the same time, the waterproof and breathable membrane 6 prevents external water vapor from entering the inside of the battery pack box body to achieve the purpose of waterproof and ventilation.

[0033] The waterproof and breathable membrane 6 can be fixed in the stepped groove 21 by means of glue adhesion or hot pressing. A pressing ring 7 is also inlaid and fixed in the stepped groove 21. The pressing ring 7 presses the outer edge of the waterproof and breathable membrane 6, which can further enhance the fixing strength of the waterproof and breathable membrane 6 and the stepped groove 21, and can effectively avoid the phenomenon that the waterproof and breathable membrane 6 comes off.

[0034] The lower end of the valve body 1 has a threaded part 13, which is used for screw installation with the screw hole of products such as a battery pack box body. Its assembly structure is simpler and the installation is more convenient. The outer periphery of the upper end of the valve body 1 has a hexagonal nut part 14, which is convenient for tools such as a hexagonal wrench to drive the valve body 1 to rotate, and thus can install the utility model more conveniently.

[0035] A second groove 105 is provided at the lower end of the valve body 1. The lower sealing ring 15 is embedded in the second groove 105, and the lower end of the lower sealing ring 15 protrudes out of the second groove 105. The lower sealing ring 15 is used to contact the outer surface of products such as the battery pack box body, thereby ensuring the sealing performance of the assembly structure.

[0036] In summary, in the present utility model, the end cover 3 is set to be relatively large, so that the end cover 3 not only covers the upper end surface of the piston 2, but also the outer edge of the cover 3 protrudes beyond the outer side surface of the piston 2 and covers the gap 103 between the accommodation groove 101 at the upper end of the valve body 1 and the outer side surface of the piston 2. Most importantly, the outer edge of the end cover 3 also extends and is bent downward to form a shielding portion 31, and the shielding portion 31 covers the periphery of the upper end of the valve body 1, so as to effectively prevent dust and other foreign matters from entering the gap 103 between the accommodation groove 101 at the upper end of the valve body 1 and the outer side surface of the piston 2, achieving an excellent dust-proof and foreign matter-proof effect, and further ensuring that the opening, pressure relief and explosion-proof functions of the explosion-proof valve can be used normally; at the same time, since the shielding portion 31 of the end cover 3 covers the periphery of the upper end of the valve body 1 and forms a first interval 301, it can prevent water from entering the gap 103 between the accommodation groove 101 at the upper end of the valve body 1 and the outer side surface of the piston 2, and further effectively prevent the phenomenon that water accumulation freezes in a low-temperature environment, resulting in the piston being unable to open and the pressure relief and explosion-proof function failing, so as to achieve the purpose of anti-freezing and ensure the normal realization of the explosion-proof function of the present utility model.

[0037] Certainly, the above are only specific embodiments of the present utility model and are not intended to limit the scope of implementation of the present utility model. Any equivalent changes or modifications made according to the structure, features and principles described in the scope of the patent application of the present utility model should be included in the scope of the patent application of the present utility model.

Claims

1. An anti-freezing explosion-proof valve, which comprises a valve body (1), a piston (2) installed in an accommodation groove (101) of the valve body (1) in a vertically slidable manner and capable of closing a pressure relief passage (102) of the valve body (1), and an end cap (3) arranged at the upper end of the piston (2), and is characterized in that: The size of the end cap (3) is larger than that of the piston (2), so that the outer edge of the end cap (3) protrudes beyond the outer side surface of the piston (2) and covers the gap (103) between the accommodation groove (101) at the upper end of the valve body (1) and the outer side surface of the piston (2). The outer edge of the end cap (3) also extends and bends downward to form a shielding portion (31). The shielding portion (31) covers the periphery of the upper end of the valve body (1) and forms a first interval (301), and a second interval (302) is formed between the inner side surface of the shielding portion (31) and the outer side surface of the piston (2).

2. The explosion-proof valve capable of preventing freezing according to claim 1, wherein: The cross-section of the shielding portion (31) is in the shape of a trumpet with a larger upper part and a smaller lower part, so that the outer surface of the shielding portion (31) is an inclined surface.

3. The explosion-proof valve capable of preventing freezing according to claim 1, wherein: The cross-section of the shielding portion (31) is in the shape of a straight cylinder.

4. The explosion-proof valve capable of preventing freezing according to claim 1, characterized in that: A convex portion (11) protruding upward is arranged in the middle of the upper end of the valve body (1). The accommodation groove (101) is arranged on the convex portion (11). The end cap (3) covers the upper end of the convex portion (11), and a third interval (303) communicating the second gap and the first gap is formed between the end cap (3) and the upper end of the convex portion (11). The shielding portion (31) covers the outside of the periphery of the convex portion (11) and forms the first interval (301), so that an upper and lower staggered structure is formed between the upper end of the convex portion (11) and the lower end of the shielding portion (31).

5. A freeze-proof explosion-proof valve according to any one of claims 1-4, characterized in that: A first groove (104) is further arranged in the accommodation groove (101). An upper sealing ring (12) is embedded in the first groove (104), and the upper end of the upper sealing ring (12) also protrudes outside the first groove (104) to be in sealing contact with the piston (2).

6. A freeze-proof explosion-proof valve according to any one of claims 1-4, characterized in that: A guide rod (4) is arranged at the lower end of the piston (2). A spring (5) is sleeved outside the guide rod (4). The lower end of the spring (5) contacts a flange (41) at the lower end of the guide rod (4), and the upper end of the spring (5) contacts the valve body (1). Under the elastic force of the spring (5), the piston (2) abuts downward in the accommodation groove (101) of the valve body (1) to close the pressure relief passage (102) of the valve body (1).

7. The explosion-proof valve capable of preventing freezing according to claim 6, characterized in that: A stepped groove (21) is formed in the piston (2) downward along its upper end surface, and a first air vent hole (22) penetrating through the lower end of the piston (2) is formed downward at the bottom of the stepped groove (21). The guide rod (4) has a second air vent hole (42) penetrating through the upper and lower ends. The second air vent hole (42) is communicated with the first air vent hole (22), and a waterproof breathable film (6) is further arranged in the stepped groove (21). The waterproof breathable film (6) covers the first air vent hole (22); an air vent groove (23) communicating the stepped groove (21) and the second interval (302) is further arranged at the upper end of the piston (2). The end cap (3) covers the upper end of the air vent groove (23) to form an air vent passage.

8. The explosion-proof valve capable of preventing freezing according to claim 7, characterized in that: A pressure ring (7) is further embedded and fixed in the stepped groove (21). The pressure ring (7) presses the outer edge of the waterproof breathable film (6).

9. The explosion-proof valve capable of preventing freezing according to claim 6, characterized in that: The lower end of the valve body (1) has a threaded portion (13), and the outer periphery of the upper end of the valve body (1) has a hexagonal nut portion (14).

10. An explosion-proof valve capable of preventing freezing according to claim 6, characterized in that: A second groove (105) is provided at the lower end of the valve body (1), and the lower sealing ring (15) is embedded and installed in the second groove (105), and the lower end of the lower sealing ring (15) also protrudes out of the second groove (105).

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