A safety release valve for high-pressure hydrogen cylinder

Abstract

The invention discloses a safety release valve for a high-pressure hydrogen cylinder. A compression spring and an adjusting nut are arranged in the safety release valve for the high-pressure hydrogen cylinder. By adjusting the nut up and down, the pressure of the compression spring to press a sealing plug is adjusted, and the pressure in the hydrogen cylinder is adjusted to reach the upper limit of pressure relief, and the adjustment is convenient. Meanwhile, a fusible sealing component is arranged in the safety release valve for the high-pressure hydrogen cylinder. When the temperature is lower than the melting point, the fusible sealing component solidifies and keeps the sealing plug to seal the gas outlet to prevent hydrogen leakage. When the temperature is higher than the melting point, the fusible sealing component melts, the pressure in the hydrogen cylinder is higher than the set upper limit, the sealing plug will be opened, and the hydrogen will flow out from the exhaust hole to the pipeline for collecting the hydrogen, so as to have a pressure relief effect and prevent explosion accidents.

Description

Technical Field

[0001] The invention relates to the technical field of safety valves, and in particular to a safety release valve for a high-pressure hydrogen cylinder. Background Art

[0002] As human demand for energy grows, non-renewable energy such as fossil fuels are facing the risk of depletion, and the impact of fossil fuels on the environment cannot be ignored. Therefore, the development and utilization of new energy sources has become an increasingly urgent requirement. Hydrogen, as a new energy source, is recognized as a clean energy source in the world and is attracting more and more attention.

[0003] At the same time, hydrogen is a flammable and explosive gas. It is explosive when mixed with fluorine, oxygen, carbon monoxide and air. Hydrogen is usually compressed and stored in special hydrogen cylinders, so the gas pressure inside the hydrogen cylinders is often relatively high. However, during the storage and use of hydrogen cylinders, if the temperature and gas pressure inside the hydrogen cylinders are too high due to environmental influences, it may cause an explosion, thereby causing a safety accident.

[0004] For this purpose, some hydrogen cylinder safety valves are designed. The Chinese patent announcement number CN109099311A, the announcement date is December 28, 2018, and discloses a hydrogen cylinder safety valve, including a joint, a safety bolt, a drainage cover and a bursting disc. The joint is provided with a through hole along the upper and lower ends thereof. The safety bolt and the drainage cover are both connected to the upper end of the joint and the head of the safety bolt is located inside the drainage cover. An accommodating cavity is formed between the upper surface of the joint, the head of the safety bolt and the inner wall of the drainage cover. The drainage cover is provided with an interface connected to the accommodating cavity. The safety bolt is provided with a channel for connecting the through hole and the accommodating cavity. The bursting disc is located between the safety bolt and the joint to separate the through hole and the channel, and the channel is filled with a fusible alloy. When the pressure and temperature in the hydrogen cylinder reach the bursting pressure of the bursting disc and the melting point of the fusible alloy respectively, the hydrogen cylinder safety valve automatically releases the hydrogen in the hydrogen cylinder, thereby improving the safety of the use of the hydrogen cylinder and avoiding safety accidents.

[0005] However, the bursting pressure of the safety valve of this type of hydrogen cylinder is limited and cannot be adjusted, and its scope of application is small. Summary of the invention

[0006] In order to solve the above technical problems, the present invention designs a safety release valve for a high-pressure hydrogen cylinder.

[0007] The present invention adopts the following technical solution:

[0008] A high-pressure hydrogen cylinder safety release valve comprises a valve block and a pressure relief valve fixedly mounted on the valve block, the pressure relief valve comprises an external drainage hood and an internal valve core structure, the lower end of the drainage hood is fixedly connected to the valve block, the upper end of the drainage hood is provided with a pressure relief outlet connected to the interior, the pressure relief outlet is provided with an interface for connecting to a hydrogen collection pipeline, the valve core structure comprises a mounting seat, a sealing plug, a fusible seal, a compression spring and an adjusting nut, the sealing plug tightly seals the air outlet of the valve block, the mounting seat is mounted on the outside of the sealing plug and fixedly connected to the valve block, an adjusting nut which can be adjusted up and down by the thread is threadedly connected to the mounting seat, a ventilation channel connected to the sealing plug is provided in the mounting seat and the adjusting nut, an exhaust hole connected to the outside is provided in the top of the adjusting nut, a compression spring is fixedly connected between the top of the adjusting nut and the sealing plug, and the sealing plug is filled with a fusible seal.

[0009] Preferably, the fusible seal is made of fusible alloy.

[0010] Preferably, the mounting seat is fixedly connected to the valve block by threads.

[0011] Preferably, the lower end of the drainage cover is threadedly connected to the valve block.

[0012] Preferably, the number of the exhaust ports is three and they are evenly distributed laterally along the circumference.

[0013] Preferably, the interface is provided with an internal thread.

[0014] Preferably, a fastening bayonet is provided at the threaded connection between the outer side of the lower end of the drainage cover and the valve block, and a sealing ring is sleeved on the fastening bayonet.

[0015] Preferably, the valve block is connected to a temperature sensor and a pressure sensor.

[0016] Preferably, a combined valve seat is connected to the valve block.

[0017] Preferably, an isolation ring is fixedly connected to the sealing plug, and ventilation holes are evenly arranged along the circumference of the outer side of the isolation ring to connect to the inner side of the isolation ring.

[0018] The beneficial effects of the present invention are as follows: (1) the present invention is provided with a compression spring and an adjusting nut. By adjusting the nut up and down, the pressure of the compression spring pressing the sealing plug is adjusted, and the pressure in the hydrogen cylinder is adjusted to reach the upper limit of pressure relief, which is convenient for adjustment; (2) the present invention is provided with a fusible seal. When the temperature is lower than the melting point, the fusible seal solidifies and keeps the sealing plug sealing the gas outlet to prevent hydrogen leakage. When the temperature is higher than the melting point, the fusible seal melts, the pressure in the hydrogen cylinder is higher than the set upper limit, the sealing plug will be opened, and the hydrogen will flow out from the exhaust hole to the hydrogen collection pipe, which plays a pressure relief role and prevents explosion accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of an installation structure of the pressure relief valve in the present invention;

[0021] Figure 3 It is a schematic diagram of the internal structure of the adjusting nut in the present invention;

[0022] In the figure: 1, valve block, 2, pressure relief valve, 3, drainage cover, 4, mounting seat, 5, sealing plug, 6, fusible seal, 7, vent hole, 8, compression spring, 9, adjusting nut, 10, sealing ring, 11, pressure relief outlet, 12, exhaust hole. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0024] Example: As attached Figure 1-3 As shown, a high-pressure hydrogen cylinder safety release valve comprises a valve block 1 and a pressure relief valve 2 fixedly mounted on the valve block, the pressure relief valve comprises an external drainage hood 3 and an internal valve core structure, the lower end of the drainage hood is fixedly connected to the valve block, the upper end of the drainage hood is provided with a pressure relief outlet 11 connected to the interior, the pressure relief outlet is provided with an interface for connecting to a hydrogen collection pipeline, the valve core structure comprises a mounting seat 4, a sealing plug 5, a fusible seal 6, a compression spring 8 and an adjusting nut 9, the sealing plug tightly seals the air outlet of the valve block, the mounting seat is mounted on the outside of the sealing plug and fixedly connected to the valve block, an adjusting nut which can be adjusted up and down by the thread is threadedly connected to the mounting seat, a ventilation channel connected to the sealing plug is provided in the mounting seat and the adjusting nut, an exhaust hole 12 connected to the outside is provided in the top of the adjusting nut, a compression spring is fixedly connected between the top of the adjusting nut and the sealing plug, and the sealing plug is filled with a fusible seal.

[0025] The fusible seal is made of fusible alloy. The mounting seat is fixedly connected to the valve block by thread. The lower end of the drainage cover is connected to the valve block by thread. There are three exhaust ports and they are evenly distributed laterally along the circumference. An internal thread is provided at the interface. A fastening bayonet is provided at the threaded connection between the outer side of the lower end of the drainage cover and the valve block, and a sealing ring 10 is sleeved on the fastening bayonet. A temperature sensor and a pressure sensor are connected to the valve block. A combined valve seat is connected to the valve block. An isolation ring is fixedly connected to the sealing plug, and vent holes 7 are evenly provided along the circumference of the outer side of the isolation ring to connect to the inner side of the isolation ring.

[0026] When the high-pressure hydrogen cylinder safety release valve is in use, the pressure of the compression spring pressing the sealing plug is adjusted by adjusting the nut up and down, and the pressure in the hydrogen cylinder is adjusted to reach the upper limit of pressure relief, and the adjustment is convenient; the high-pressure hydrogen cylinder safety release valve is provided with a fusible seal, when the temperature is lower than the melting point, the fusible seal solidifies and keeps the sealing plug sealing the gas outlet to prevent hydrogen leakage, when the temperature is higher than the melting point, the fusible seal melts, the pressure in the hydrogen cylinder is higher than the set upper limit, the sealing plug will be opened, and the hydrogen will flow out from the exhaust hole to the hydrogen collection pipe, which has a pressure relief effect and prevents explosion accidents.

[0027] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A high-pressure hydrogen cylinder safety release valve, characterized in that: It includes a valve block and a pressure relief valve fixedly installed on the valve block, the pressure relief valve includes an external drainage cover and an internal valve core structure, the lower end of the drainage cover is fixedly connected to the valve block, the upper end of the drainage cover is provided with a pressure relief outlet connected to the inside, the pressure relief outlet is provided with an interface for connecting to a pipeline for collecting hydrogen, the valve core structure includes a mounting seat, a sealing plug, a fusible seal, a compression spring and an adjusting nut, the sealing plug tightly seals the air outlet of the valve block, the mounting seat is installed on the outside of the sealing plug and fixedly connected to the valve block, the mounting seat is threadedly connected with an adjusting nut that can be adjusted up and down by the thread, the mounting seat and the adjusting nut are provided with a ventilation channel connected to the sealing plug, the top of the adjusting nut is provided with an exhaust hole connected to the outside, the top of the adjusting nut is fixedly connected with a compression spring between the sealing plug, and the sealing plug is filled with a fusible seal; The fusible seal is made of fusible alloy; The valve block is connected with a temperature sensor and a pressure sensor.

2. A high-pressure hydrogen cylinder safety release valve according to claim 1, characterized in that: The mounting seat is threadedly fixedly connected to the valve block.

3. A high-pressure hydrogen cylinder safety release valve according to claim 1, characterized in that: The lower end of the drainage cover is threadedly connected to the valve block.

4. A high-pressure hydrogen cylinder safety release valve according to claim 1, characterized in that: The number of the exhaust holes is three and they are evenly distributed laterally along the circumference.

5. A high-pressure hydrogen cylinder safety release valve according to claim 1, characterized in that: The interface is provided with an internal thread.

6. A high-pressure hydrogen cylinder safety release valve according to claim 3, characterized in that: A fastening bayonet is provided at the threaded connection between the outer side of the lower end of the drainage cover and the valve block, and a sealing ring is sleeved on the fastening bayonet.

7. A high-pressure hydrogen cylinder safety release valve according to claim 1, characterized in that: The valve block is connected with a combined valve seat.

8. A high-pressure hydrogen cylinder safety release valve according to claim 1, characterized in that: An isolation ring is fixedly connected to the sealing plug, and ventilation holes are evenly arranged along the circumference of the outer side of the isolation ring to communicate with the inner side of the isolation ring.

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