A spring-controlled explosion-proof valve and its application

Abstract

The present invention relates to a spring-controlled explosion-proof valve and its application principle, comprising a valve body and a valve core. The valve body is provided with an air vent, and the valve core is elastically penetrated in the valve body and pressed on the air vent by an elastic member. A limiter for blocking the valve core from resetting is provided in the valve core. The present invention is mainly applied to sealed containers such as battery packs, electrical control boxes, and storage tanks. The air pressure value in the container can be effectively controlled by the elastic member to maintain the air pressure in the container stable. A limiter is provided in the valve core. When the pressure inside the container rises sharply and the valve core is lifted to a certain height by the gas in the container, the limiter pops out and is stuck on the valve body. The valve core will not be reset due to the reduction of air pressure, thereby ensuring that the gas in the container is quickly and fully discharged, thereby playing an explosion-proof role. In addition, the opening and closing state of the valve core is detected by a signal needle, which can be reflected to the operator in time to eliminate the fault in time.

Description

Technical Field

[0001] The invention relates to the technical field of explosion-proof valves, in particular to a spring-controlled explosion-proof valve and application thereof. Background Art

[0002] The waterproof and dustproof protection level of the housing of electronic and electrical equipment such as outdoor electrical control boxes, energy storage battery boxes, and new energy vehicle power battery packs is generally required to meet the national standard GB 4208-2008 "Enclosure Protection Level" (IP Code) IP67 or above. Therefore, it is required to be sealed, but electronic and electrical components will generate heat during operation, causing the air in the sealed container to expand due to the temperature rise. If it cannot be discharged in time, the pressure in the box will continue to increase, especially for sealed boxes with components such as batteries and large capacitors or containers for storing flammable and explosive chemicals. When the batteries, capacitors or chemicals inside are thermally runaway, high temperature and high pressure will be generated, which will generate huge pressure in the box and there is a risk of violent explosion. Therefore, an explosion-proof valve is needed to prevent explosion and reduce the damage caused by the explosion.

[0003] The existing explosion-proof valve pressure relief method is generally that when the air pressure in the container is higher than the explosion pressure value of the explosion-proof valve, the high-pressure gas will lift the valve core and discharge it, but the valve core opening height changes with the pressure. When the air pressure in the container gradually decreases, the valve core opening height will become smaller, and it will be reset and sealed again before the gas is completely discharged. The exhaust speed is directly related to the valve core opening height. When the valve core is closed or the opening height becomes smaller, the gas discharge and pressure relief speed in the container will slow down, and the gas in the box cannot be fully discharged, which directly affects the pressure relief and explosion-proof effect. In addition, the existing explosion-proof valve does not have a detection mechanism for whether the valve core is open. If the valve core is accidentally opened and is not easy to be discovered, it will cause the sealing of the sealed container to fail, and cause serious consequences after water or dust enters. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a spring-controlled explosion-proof valve which has a fast pressure relief speed, can fully discharge the gas in the container, and can detect whether the explosion-proof valve core is opened.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a spring-controlled explosion-proof valve, comprising a valve body and a valve core, the valve body is provided with an air vent, the valve core is elastically penetrated into the valve body through an elastic member and pressed on the air vent, and a limit member is provided inside the valve core for preventing the valve core from resetting.

[0006] Preferably, the valve core includes a piston and a guide rod, the piston is pressed on the air vent, the guide rod passes through the valve body and is connected to the piston, an elastic member is sleeved on the guide rod, one end of the elastic member is against the bottom surface of the valve body, and the other end of the elastic member is against the guide rod.

[0007] Preferably, the elastic member is a precision spring, which can accurately control the explosion-proof pressure value.

[0008] Preferably, the limit member includes a limit pin and a pin spring, and the limit pin is elastically arranged in the valve core through the pin spring. When the valve core is lifted up, the limit pin extends out of the valve core through the rebound force of the pin spring, and is stuck on the valve body, preventing the valve core from resetting.

[0009] Preferably, the limiting member is arranged inside the guide rod.

[0010] Preferably, the limiting member is arranged in the piston.

[0011] Preferably, a center hole is provided at the center of the valve body, and a guide rod is passed through the center hole and connected to the piston.

[0012] Preferably, the upper and lower end surfaces of the valve body are respectively provided with a first sealing ring groove and a second sealing ring groove, a central area of ​​the valve body is provided with a plurality of connecting ribs, and air holes are opened between adjacent connecting ribs.

[0013] Preferably, the lower end surface of the piston and the lower end surface of the valve body are respectively provided with a first sealing ring groove and a second sealing ring groove, and a plurality of air vents are provided in the peripheral area of ​​the center hole of the valve body.

[0014] Preferably, the cross-sections of the first sealing ring groove and the second sealing ring groove are rectangular.

[0015] Preferably, the cross-sections of the first sealing ring groove and the second sealing ring groove are trapezoidal.

[0016] Preferably, one of the first sealing ring groove and the second sealing ring groove has a trapezoidal cross section and the other has a rectangular cross section.

[0017] Preferably, the ventilation holes are a plurality of circular through holes.

[0018] Preferably, the ventilation is also a plurality of special-shaped through holes.

[0019] Preferably, the valve body is further provided with a mounting hole, which is a through hole or a threaded hole.

[0020] Preferably, a connecting column is provided at the bottom of the valve body, and the connecting column is provided with an external thread.

[0021] Preferably, a spring-controlled explosion-proof valve further includes a signal needle for detecting whether the valve core is open, and the signal needle is arranged on the valve body. Under normal circumstances, the two signal needles contact the valve core to form a passage. When the valve core is opened, the signal needle and the valve core are separated to form a circuit break. This passage or circuit break signal can be monitored through the controller output, such as output as a signal indicator light or sound alarm, so that abnormalities can be discovered in time and checked and troubleshooted.

[0022] Preferably, the tail end of the signal pin is connected with a wire for signal output.

[0023] Preferably, it also includes a first sealing ring, which is arranged in the first sealing ring groove.

[0024] Preferably, it also includes a second sealing ring, which is arranged in the second sealing ring groove.

[0025] The present invention is mainly used in sealed containers such as battery packs, electrical control boxes, and storage tanks.

[0026] Its working principle is: when the pressure value in the container is slightly greater than the preset valve core opening pressure, the valve core is slightly opened for ventilation to prevent the pressure from continuing to rise. When the pressure drops, the valve core can automatically reset and seal again under the action of the spring; when an abnormality occurs and the pressure in the sealed container rises sharply, there is a risk of explosion. Under the action of higher pressure, the valve core is opened to a certain height, and the height exceeds the limiter. The limiter set in the explosion-proof valve pops up and gets stuck on the valve body. The valve core will not reset due to gas discharge and reduced air pressure, which can quickly discharge the gas in the container, reduce the pressure in the container, and play an explosion-proof role. At the same time, the explosion-proof valve core is opened, and the detection signal needle is separated from the valve core, which becomes an open circuit. The output signal can be monitored in time to prompt personnel to check and troubleshoot.

[0027] The beneficial effects of the present invention are as follows: the present invention can effectively control the air pressure value in the container through the elastic part, so that the air pressure in the container is maintained stable, and a limit piece is arranged in the valve core. When the internal pressure of the container rises sharply and the valve core is lifted to a certain height by the gas in the container, the limit piece pops out and gets stuck on the valve body, and the valve core will not be reset due to the reduction of air pressure, thereby ensuring that the gas in the container is quickly and fully discharged, thereby playing an explosion-proof role. In addition, the opening and closing state of the valve core is detected by the signal needle, which can be reflected to the operator in time to eliminate the fault in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional schematic diagram of Example 1.

[0029] Figure 2 It is a three-dimensional schematic diagram of embodiment 1 from another direction.

[0030] Figure 3 It is a cross-sectional view of Example 1 in a normal state.

[0031] Figure 4 It is a cross-sectional view of the pressure relief state of Example 1.

[0032] Figure 5 It is a top view of the valve body of Example 1.

[0033] Figure 6 It is a cross-sectional view of the valve body of Example 1.

[0034] Figure 7 This is a cross-sectional view of the piston of Example 1.

[0035] Figure 8 This is a cross-sectional view of the guide rod of Example 1.

[0036] Fig. 9 It is a stereoscopic schematic diagram of Example 2.

[0037] Fig.10 This is a cross-sectional view of Example 2.

[0038] Fig.11 It is a top view of the valve body of Example 3.

[0039] Fig.12 It is a cross-sectional view of the valve body of Example 3.

[0040] Explanation of the reference numerals: 1. valve body; 11. first sealing ring groove; 12. second sealing ring groove; 13. connecting rib; 14. air vent; 15. center hole; 16. side wing; 17. mounting hole; 18. connecting column; 2. guide rod; 3. valve core spring; 4. piston; 41. boss; 42. stud; 5. limit piece; 51. sleeve; 52. limit pin; 53. pin spring; 6. signal pin; 7. first sealing ring; 8. second sealing ring. DETAILED DESCRIPTION

[0041] Example 1

[0042] See also Figure 1-8As shown, the present invention relates to a spring-controlled explosion-proof valve, comprising a valve body 1 and a valve core, wherein the upper and lower end surfaces of the valve body 1 are respectively provided with a first sealing ring groove 11 and a second sealing ring groove 12, wherein the first sealing ring groove 11 is provided with a first sealing ring 7, wherein the second sealing ring groove 12 is provided with a second sealing ring 8, wherein the central area of ​​the valve body 1 is provided with three connecting ribs 13, wherein a special-shaped air vent 14 is provided between adjacent connecting ribs 13, wherein a central hole 15 is provided at the intersection of the three connecting ribs 13, wherein side wings 16 are respectively provided opposite to each other on both sides of the valve body 1, wherein a mounting hole 17 is provided on the side wings 16, wherein the valve core comprises a piston 4 and a guide rod 2, wherein the guide rod 2 The valve core spring 3 is elastically penetrated in the center hole 15, one end of the return spring 3 is against the bottom surface of the valve body 1, and the other end of the return spring 3 is against the guide rod 2. A threaded hole is provided in the guide rod 2. The piston 4 is provided on the upper end surface of the valve body 1. A boss 41 is provided at the bottom of the piston 4. A stud 42 is provided at the bottom end of the boss 41. The piston 4 is threadedly connected with the threaded hole through the stud 42, so as to be linked with the guide rod 2. A first through hole is provided on the side of the boss 41, and a limit member 5 is provided in the first through hole. The limit member 5 includes a sleeve 51, a limit clamping pin 52 and a clamping pin spring 53. The sleeve 51 is fixed in the first through hole, and the limit clamping pin 52 is elastically provided in the sleeve 51 through the clamping pin spring 53.

[0043] Preferably, the cross section of the first sealing ring groove 11 is a trapezoid, wherein the mouth is small and the bottom is large; the cross section of the second sealing ring groove 12 is a rectangular trapezoid, and has rounded corners at the bottom.

[0044] Preferably, it further comprises a signal pin 6 , wherein the signal pin 6 is arranged on the connecting rib 13 .

[0045] When the air pressure in the container is less than the elastic force of the reset spring 3, the piston 4 is pressed on the valve body 1 to block the gas from being discharged from the air vent 14, the limit pin 52 is retracted in the first through hole, the pin spring 53 is in a compressed state, the signal pin 6 contacts the piston 4 to form a passage, and the connection signal is output to the controller through the wire welded at the tail end of the signal pin 6; when the pressure value in the container is slightly greater than the preset valve core opening pressure, the gas pushes the piston 4, the valve core opens slightly for ventilation, so that the piston 4 is separated from the valve body 1, and the gas is discharged from the air vent 14 to prevent the pressure from continuing to rise. When the pressure drops below the elastic force of the valve core spring 3, under the action of the valve core spring 3, the guide rod 2 drives the piston 4 to automatically reset and seal again.

[0046] When the pressure in the sealed container rises sharply due to an abnormality, and there is a risk of explosion, the valve core is opened to a certain height under the action of higher pressure, and the limiter 5 exceeds the upper end face of the center hole 15. At this time, the limiter needle 52 extends out of the first through hole through the needle spring 53 and is stuck on the upper end face of the upper end face of the center hole 15 of the valve body 1. Due to the action of the limiter needle 52, the valve core will not be reset due to the reduction of the gas exhaust pressure, so that the piston 4 and the valve body 1 remain separated, and the gas can be quickly discharged from the air vent 14 to relieve the pressure, which plays an explosion-proof role. When the valve core is open, the signal needle 6 is separated from the piston 4, and a short circuit is formed between the two signal needles 6. The signal is output to the controller through the wire welded at the tail end of the signal needle 6, and the abnormality can be detected in time to prompt the personnel to check and eliminate the fault.

[0047] Example 2

[0048] See also Figure 9-10 As shown, this embodiment is a variation of the embodiment 1, and the variation is that: the valve body 1 is cylindrical, four connecting ribs 13 are provided in the valve body 1, and the four connecting ribs 13 are provided with mounting holes 17, the valve body 1 is fixedly mounted on the container through the mounting holes 17 and screws, a second through hole is provided on the side of the guide rod 2, and the stopper 5 is provided in the second through hole. Compared with the embodiment 1, this embodiment occupies less space.

[0049] Example 3

[0050] See also Figure 11-12 As shown, this embodiment is a variation of embodiment 2, and the variation is that: the valve body 1 is in the shape of a hexagon, and a connecting column 18 is provided at the bottom thereof, and an external thread is provided on the connecting column 18. This embodiment can be directly installed on the container without screws, and this embodiment is easier to disassemble and assemble than embodiment 2.

[0051] The present invention is mainly used in sealed containers such as battery packs, electrical control boxes, and storage tanks.

[0052] The working principle of the present invention is: when the pressure value in the container is slightly greater than the preset valve core opening pressure, the valve core is slightly opened for ventilation to prevent the pressure from continuing to rise. When the pressure drops, the valve core can automatically reset and seal again under the action of the valve core spring 3; when an abnormality occurs and the pressure in the sealed container rises sharply, there is a risk of explosion. Under the action of higher pressure, the valve core is opened to a certain height, and the height exceeds the limiter 5. The limiter 5 set in the explosion-proof valve pops up and gets stuck on the valve body 1. The valve core will not reset due to gas discharge and reduced air pressure, so that the gas in the container can be quickly discharged, reducing the pressure in the container and playing an explosion-proof role. At the same time, the explosion-proof valve core is opened, and the detection signal needle 6 is separated from the valve core, which becomes an open circuit. The output signal can be monitored in time to prompt personnel to check and eliminate the fault.

[0053] The above implementation modes are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A spring-controlled explosion-proof valve, Features : It includes a valve body and a valve core, the center of the valve body is provided with a center hole, a plurality of air vents are provided in the central peripheral area of ​​the valve body, the air vents are circular or special-shaped through holes, the valve core includes a piston and a guide rod, the piston is pressed on the air vent, the guide rod passes through the center hole and is connected to the piston, an elastic member is sleeved on the guide rod, one end of the elastic member is against the bottom surface of the valve body, and the other end of the elastic member is against the guide rod; A limiter is provided in the valve core, and the limiter includes a limiter clamping pin and a clamping pin spring. The limiter clamping pin is elastically arranged in the valve core through the clamping pin spring. When the valve core is lifted up, the limiter clamping pin extends out of the valve core through the rebound force of the clamping pin spring and is clamped on the valve body, thereby preventing the valve core from resetting under the rebound force of the elastic member. It also includes a signal needle for detecting whether the valve core is open, wherein two signal needles are provided, and both signal needles are provided on the valve body. When the valve core is in a reset state, the two signal needles abut against the valve core and form a passage. When the valve core is in a lifted state, the two signal needles are separated from the valve core and form a circuit break. The upper and lower end surfaces of the valve core are respectively provided with a first sealing ring groove and a second sealing ring groove, or the lower end of the piston and the lower end surface of the valve body are respectively provided with a first sealing ring groove and a second sealing ring groove, the cross-sections of the first sealing ring groove and the second sealing surface groove are trapezoidal or rectangular, the first sealing ring groove is provided with a first sealing ring, and the second sealing ring groove is provided with a second sealing ring; The valve body is provided with a mounting hole, the bottom of the valve body is provided with a connecting column, and the connecting column is provided with a thread; The spring-controlled explosion-proof valve is mainly used in sealed containers. When the pressure value in the container is slightly greater than the preset valve core opening pressure, the gas pushes the piston, the valve core opens slightly for ventilation, the piston is separated from the valve body, and the gas is discharged from the air vent to prevent the pressure from continuing to rise. When the pressure drops below the elastic force of the valve core spring, the guide rod drives the piston to automatically reset and seal again under the action of the elastic member; when the pressure in the abnormal sealed container rises sharply and there is a risk of explosion, the valve core is opened to a certain height under the action of the higher pressure, and the limit member exceeds the upper end face of the center hole. At this time, the limit clamping pin extends out through the clamping pin spring and is clamped on the upper end face of the center hole of the valve body. Due to the action of the limit clamping pin, the valve core will not reset due to the reduction of gas exhaust pressure, so that the piston and the valve body remain separated, and the gas can be quickly discharged from the air vent to relieve pressure, which plays an explosion-proof role; when the valve core is open, the signal needle is separated from the piston, and a short circuit is formed between the two signal needles. The signal is output to the controller through the wire welded at the tail end of the signal needle to monitor and find abnormalities.

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