Novel TPRD pressure relief device for high-pressure hydrogen cylinder

Abstract

The invention relates to a novel TPRD pressure relief device for a high-pressure hydrogen cylinder, and relates to the technical field of high-pressure hydrogen storage systems, the novel TPRD pressure relief device comprises a valve body, the valve body comprises a valve body and a valve cover which are detachably connected, one end of the valve body in the length direction is provided with a gas inlet and outlet part, and the other end of the valve body in the length direction is provided with a detection part; one end of the valve body in the width direction is provided with a gas inlet hole for introducing hydrogen, the gas inlet hole is located at one end, close to the gas inlet and outlet part, of the valve body, the valve body is internally provided with a containing cavity, a piston block slides in the containing cavity, a glass bulb for detecting temperature is arranged in the containing cavity, and one end of the glass bulb in the length direction abuts against the piston block. The structure is simple, and pressure relief is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure hydrogen storage systems, and in particular to a novel TPRD pressure relief device for high-pressure hydrogen cylinders. Background Art

[0002] In high-pressure hydrogen storage systems, TPRD acts as a temperature-sensing pressure relief device. When a fire or other unexpected situation causes the ambient temperature of the hydrogen storage cylinder to be too high, it can automatically relieve pressure to prevent the cylinder from cracking or exploding due to excessive pressure.

[0003] Normally, the TPRD is closed. When the ambient temperature reaches a certain value, the state of the temperature-sensing element within the TPRD changes, the previously closed discharge channel opens, and the medium flows out, achieving a pressure relief function. The temperature-sensing element of the TPRD used in common high-pressure hydrogen cylinders is affected by the pressure within the cylinder, which is variable and has a wide range of pressure fluctuations, generally ranging from 2MPa to 70MPa. This places high demands on the pressure-bearing capacity, stability, and lifespan of the temperature-sensing element. Initially, the diameter of the discharge channel is reduced to minimize the force on the temperature-sensing element, but this also limits the discharge capacity of the TPRD pressure relief device, making it unable to meet the high-discharge requirements of large-volume cylinders.

[0004] After the TPRD is discharged urgently, the residue of the temperature sensing element generally flows into the downstream channel with the gas or is directly discharged into the environment. Flowing into the downstream channel will affect the cleanliness of the entire piping system and even damage other components. Direct discharge into the environment will cause environmental pollution. Summary of the Invention

[0005] In order to solve the above problems, the present application provides a new TPRD pressure relief device for high-pressure hydrogen cylinders.

[0006] This application provides a new TPRD pressure relief device for high-pressure hydrogen cylinders, which adopts the following technical solutions: A novel TPRD pressure relief device for a high-pressure hydrogen cylinder includes a valve body, which includes a detachably connected valve body and a valve cover. One end of the valve body in the length direction is set as an air inlet and outlet part, and the other end of the valve body in the length direction is set as a detection part. The air inlet and outlet part is provided with a relief hole, and one end of the valve body in the width direction is provided with an air inlet hole for introducing hydrogen. The air inlet hole is located at one end of the valve body close to the air inlet and outlet part. An accommodating cavity is provided inside the valve body, a piston block slides in the accommodating cavity, and a temperature sensing component for detecting temperature is provided in the accommodating cavity.

[0007] Optionally, the temperature sensing element is provided in the detection portion, one end of the temperature sensing element in the length direction is fixedly connected to the side wall of the accommodating cavity, and the other end of the temperature sensing element in the length direction abuts against the piston block.

[0008] Optionally, a protrusion is provided on one end of the temperature sensing member close to the piston block, and a receiving groove is provided on one end of the piston block close to the temperature sensing member. A supporting ring is arranged in the receiving groove, and the supporting ring abuts against the protrusion.

[0009] Optionally, the valve cover is detachably connected to the valve body, and the end of the temperature sensing element away from the protrusion is fixedly connected to the valve cover.

[0010] Optionally, an elastic member is provided in the accommodating cavity, one end of the elastic member in the length direction is fixedly connected to the valve body, and the other end of the elastic member in the length direction is fixedly connected to the piston block.

[0011] Optionally, the valve body is provided with a flow guide cavity, which is annular and located at one end close to the air inlet and outlet.

[0012] Optionally, the air inlet and outlet parts are provided with a sealing part, which includes two retaining rings sleeved on the outside of the piston block, one retaining ring is located above the air inlet hole, and the other retaining ring is located below the air inlet hole.

[0013] Optionally, a sealing ring 1 is sleeved on the outside of each retaining ring.

[0014] Optionally, the detection portion is provided with a second sealing ring, which is arranged on the valve body. When the valve cover is connected to the valve body, the valve cover abuts against the second sealing ring.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. Under normal conditions, hydrogen enters the valve body from the air inlet. Under the seal of the two sealing rings, the gas cannot flow out from the air leakage hole. If the temperature reaches the tolerance limit of the temperature sensing element, the temperature sensing element will rupture, and the piston block will move away from the air inlet and outlet under the action of the elastic element. At this time, the air inlet and the air leakage hole are connected, and the gas flows out from the air leakage hole to complete the pressure relief. The structure is simple and the pressure relief is convenient. 2. Under the sealing effect of the two sealing rings, the temperature sensing element is only subjected to the thrust generated by the spring compression when it is not broken, and is not subjected to the thrust generated by the high-pressure medium. This can improve the stability of the temperature sensing element and also extend the life of the temperature sensing element placed in the valve body; 3. Since the temperature sensing element is not affected by the force of the medium, there is no need to consider the problem of insufficient bearing capacity of the temperature sensing element due to the excessive diameter of the air inlet and air discharge holes. When designing the valve body, the diameter of the air inlet and air discharge holes can be increased to meet the requirements of larger displacement and can be applied to larger high-pressure hydrogen storage bottles.

[0016] 4. If the temperature sensing element is broken, the residue of the temperature sensing element will remain in the enclosed space formed between the valve cover and the piston block and will not flow into other positions of the valve body. It is easier to clean and replace the temperature sensing element. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a new type of TPRD pressure relief device for high-pressure hydrogen cylinders.

[0018] Explanation of the accompanying reference numerals: 1. Valve body; 11. Valve body; 111. Guide chamber; 12. Valve cover; 13. Air inlet and outlet; 14. Detection part; 141. Sealing ring 2; 15. Air bleed hole; 16. Air inlet hole; 2. Piston block; 21. Accommodating groove; 22. Support ring; 23. Retaining ring; 24. Sealing ring 1; 3. Temperature sensing part; 31. Protrusion; 4. Accommodating chamber; 41. Elastic part. DETAILED DESCRIPTION

[0019] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0020] The embodiments of the present application disclose a novel TPRD pressure relief device for high-pressure hydrogen cylinders.

[0021] Reference Figure 1 A novel TPRD pressure relief device for high-pressure hydrogen cylinders includes a valve body 1, which includes a detachably connected valve body 11 and a valve cover 12. One end of the valve body 1 in the longitudinal direction is set as an air inlet and outlet portion 13, and the other end of the valve body 1 in the longitudinal direction is set as a detection portion 14. The air inlet and outlet portion 13 is provided with a bleed hole 15, and one end of the valve body 1 in the width direction is provided with an air inlet hole 16 for introducing hydrogen. The air inlet hole 16 is located at the end of the valve body 1 near the air inlet and outlet portion 13. The interior of the valve body 1 is provided with an accommodating chamber 4, a piston block 2 slides in the accommodating chamber 4, and a temperature sensing element 3 for detecting temperature is provided in the accommodating chamber 4; Reference Figure 1 , install the valve body 1 on the hydrogen storage bottle. Under normal conditions, hydrogen enters the valve body 1 from the air inlet 16. Under the sealing of the two sealing rings 24, the gas cannot flow out from the air leakage hole 15. If the temperature reaches the tolerance limit of the temperature sensing element 3, the temperature sensing element 3 will rupture, and the piston block 2 will move away from the air inlet and outlet part 13 under the action of the elastic member 41. At this time, the air inlet 16 is connected with the air leakage hole 15, and the gas flows out from the air leakage hole 15 to complete the pressure relief. The structure is simple and the pressure relief is convenient.

[0022] Reference Figure 1 The valve cover 12 is detachably connected to the valve body 11, and a protrusion 31 is provided on the end of the temperature sensing member 3 close to the piston block 2. The end of the temperature sensing member 3 away from the protrusion 31 is fixedly connected to the valve cover 12. During installation, the valve cover 12 and the temperature sensing member 3 are inserted into the valve body 11. An elastic member 41 is provided in the accommodating cavity 4. One end of the elastic member 41 in the length direction is fixedly connected to the valve body 11, and the other end of the elastic member 41 in the length direction is fixedly connected to the piston block 2. During the installation of the valve cover 12, the piston block 2 is forced to move, and the elastic member 41 is compressed.

[0023] Reference Figure 1After the valve cover 12 and the valve body 11 are installed, the temperature sensing component 3 is located in the detection part 14. The detection part 14 is provided with a second sealing ring 141. The second sealing ring 141 is provided on the valve body 11. When the valve cover 12 is connected to the valve body 11, the valve cover 12 abuts against the second sealing ring 141, thereby improving the sealing effect of the valve body 1; the piston block 2 is provided with a receiving groove 21 at one end close to the temperature sensing component 3, and a support ring 22 is arranged in the receiving groove 21, and the support ring 22 abuts against the protrusion 31.

[0024] Reference Figure 1 The piston block 2 has a receiving groove 21 at one end near the temperature sensing element 3. A support ring 22 is disposed within the receiving groove 21 and abuts against the protrusion 31. At this point, one side of the piston block 2 along its length blocks the air inlet 16, while one end of the piston block 2 along its length blocks the air vent 15. A sealing portion is provided on the outside of the piston block 2. The sealing portion includes two retaining rings 23 that are sleeved on the outside of the piston block 2. One retaining ring 23 is located above the air inlet 16, and the other retaining ring 23 is located below the air inlet 16. Each retaining ring 23 is sleeved with a sealing ring 24.

[0025] Reference Figure 1 Under the sealing effect of the two sealing rings 24, the temperature sensing element 3 is only subjected to the thrust generated by the spring compression in the unbroken state, and will not be subjected to the thrust generated by the high-pressure medium, thereby improving the stability of the temperature sensing element 3 and increasing the life of the temperature sensing element 3 placed in the valve body 1.

[0026] Among them, since the temperature sensing component 3 is not affected by the force of the medium, there is no need to consider the problem of insufficient bearing capacity of the temperature sensing component 3 due to the excessive diameter of the air inlet hole 16 and the air discharge hole 15. When designing the valve body 1, the diameter of the air inlet hole 16 and the air discharge hole 15 can be increased to meet larger displacement requirements and can be suitable for larger volume high-pressure hydrogen storage bottles.

[0027] In this embodiment, the temperature sensing element 3 is a glass bulb. Since the glass bulb is relatively sensitive to temperature changes, it can quickly respond to temperature changes and break. It also has a simple structure and low maintenance cost.

[0028] If the glass bulb breaks, the residue of the glass bulb remains in the closed space formed between the valve cover 12 and the piston block 2 and will not flow into other positions of the valve body 1. It is relatively easy to clean and replace the temperature sensing element 3.

[0029] The working principle of the TPRD pressure relief device for a new type of high-pressure hydrogen cylinder in the embodiment of the present application is as follows: when the valve body 1 is in a normal state, hydrogen enters from the air inlet 16, and under the sealing of the two sealing rings 24, the gas cannot flow out from the air leakage hole 15; under the sealing effect of the two sealing rings 24, the temperature sensing element 3 is only subjected to the thrust generated by the spring compression in the unbroken state, and will not be subjected to the thrust generated by the high-pressure medium, thereby improving the stability of the temperature sensing element 3 and also improving the life of the temperature sensing element 3 placed in the valve body 1; since the temperature sensing element 3 is not affected by the medium force, there is no need to consider the temperature sensing element 3 being too large due to the diameter of the air inlet 16 and the air leakage hole 15. To solve the problem of insufficient bearing capacity of the temperature sensing component 3, the diameters of the air inlet 16 and the air discharge hole 15 can be increased when designing the valve body 1, which can meet the requirements of larger displacement and can be applied to high-pressure hydrogen storage bottles of larger volume; if the temperature reaches the tolerance limit of the temperature sensing component 3, the temperature sensing component 3 will rupture, and the piston block 2 will move away from the air inlet and outlet part 13 under the action of the elastic component 41. At this time, the air inlet 16 is connected with the air discharge hole 15, and the gas flows out of the air discharge hole 15 to complete the pressure relief, which has a simple structure and convenient pressure relief; the residue of the glass bulb is still in the enclosed space formed between the valve cover 12 and the piston block 2, and will not flow into other positions of the valve body 1, so it is relatively easy to clean and replace the temperature sensing component 3.

[0030] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A novel TPRD pressure relief device for a high-pressure hydrogen cylinder, comprising a valve body (1), characterized in that: The valve body (1) comprises a detachably connected valve body (11) and a valve cover (12); one end of the valve body (1) in the longitudinal direction is provided as an air inlet and outlet portion (13); the other end of the valve body (1) in the longitudinal direction is provided as a detection portion (14); an air leak hole (15) is provided in the air inlet and outlet portion (13); one end of the valve body (1) in the width direction is provided with an air inlet hole (16) for introducing hydrogen; the air inlet hole (16) is located at one end of the valve body (1) close to the air inlet and outlet portion (13); an accommodating chamber (4) is provided inside the valve body (1); a piston block (2) slides in the accommodating chamber (4); and a temperature sensing element (3) for detecting temperature is provided in the accommodating chamber (4).

2. The novel TPRD pressure relief device for high-pressure hydrogen cylinders according to claim 1 is characterized in that: The temperature sensing element (3) is arranged in the detection part (14), one end of the temperature sensing element (3) in the length direction is fixedly connected to the side wall of the accommodating cavity (4), and the other end of the temperature sensing element (3) in the length direction abuts against the piston block (2).

3. The novel TPRD pressure relief device for high-pressure hydrogen cylinders according to claim 2 is characterized in that: The temperature sensing element (3) is provided with a protrusion (31) at one end close to the piston block (2), and the piston block (2) is provided with a receiving groove (21) at one end close to the temperature sensing element (3). A supporting ring (22) is arranged in the receiving groove (21), and the supporting ring (22) abuts against the protrusion (31).

4. The novel TPRD pressure relief device for high-pressure hydrogen cylinders according to claim 3 is characterized in that: The valve cover (12) is detachably connected to the valve body (11), and one end of the temperature sensing element (3) away from the protrusion (31) is fixedly connected to the valve cover (12).

5. The novel TPRD pressure relief device for high-pressure hydrogen cylinders according to claim 1 is characterized in that: An elastic member (41) is provided in the accommodating cavity (4), one end of the elastic member (41) in the length direction is fixedly connected to the valve body (11), and the other end of the elastic member (41) in the length direction is fixedly connected to the piston block (2).

6. The novel TPRD pressure relief device for high-pressure hydrogen cylinders according to claim 1 is characterized in that: The valve body (11) is provided with a flow guiding cavity (111), which is annular and located at one end close to the air inlet and outlet portion (13).

7. The novel TPRD pressure relief device for high-pressure hydrogen cylinders according to claim 1 is characterized in that: The air inlet and outlet portion (13) is provided with a sealing portion, which includes two retaining rings (23) sleeved on the outside of the piston block (2), one retaining ring (23) is located above the air inlet hole (16), and the other retaining ring (23) is located below the air inlet hole (16).

8. The novel TPRD pressure relief device for high-pressure hydrogen cylinders according to claim 7 is characterized in that: The outside of each retaining ring (23) is sleeved with a sealing ring (24).

9. The novel TPRD pressure relief device for high-pressure hydrogen cylinders according to claim 1 is characterized in that: The detection portion (14) is provided with a second sealing ring (141), which is provided on the valve body (11). When the valve cover (12) is connected to the valve body (11), the valve cover (12) abuts against the second sealing ring (141).

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