Split type low-pressure hydrogen safety valve structure

Abstract

The split type low-pressure hydrogen safety valve structure comprises a bottom shell, a middle body and a valve element, a mounting hole is formed in the upper section of the bottom shell, a valve element hole is formed in the middle section of the bottom shell, and an air inlet hole is formed in the lower section of the bottom shell; a sealing protruding ring protruding upwards is arranged on the valve element hole bottom plate on the outer side of the upper end of the air inlet hole, and the upper top face of the sealing protruding ring is an arc face. The lower end of the middle body is screwed in the mounting hole, and an air outlet joint is arranged at the upper end of the middle body; a spacer ring is screwed in the middle section of the middle body, a spring seat is arranged at the lower end of the spacer ring, and a pressure spring is arranged below the spring seat; according to the utility model, a split structure is adopted, so that a longer inner hole is avoided in the processing process, and the processing and the installation are convenient; the arc-shaped sealing convex ring is additionally arranged, so that the area of the sealing ring surface is increased, the sealing specific pressure required by the sealing surface is reduced, trace leakage is reduced, the sealing effect is better, the sealing sleeve is prevented from being damaged, and the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a split low-pressure hydrogen safety valve structure. Background Art

[0002] The low-pressure hydrogen safety valve, also known as the hydrogen safety valve, is an important component of the hydrogen supply system of the hydrogen fuel cell. When the fuel cell system fails and the system pressure exceeds the rated pressure, it can quickly open to release excess pressure to ensure that the fuel cell stack is not damaged. Due to the low operating pressure of the fuel cell system, the hydrogen safety valve is more sensitive to pressure and requires high control accuracy.

[0003] Usually the valve body is an integrated structure with a deep inner hole. When installing the internal components (such as springs, adjusting nuts, etc.), the tools need to go deep, which is inconvenient to install. Some valves have slight leakage at the valve core seal during operation, affecting the stability of the system. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the utility model provides a split low-pressure hydrogen safety valve structure that is easy to assemble and more stable.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A split low-pressure hydrogen safety valve structure, comprising:

[0007] The bottom shell has a mounting hole formed in the upper section, a valve core hole formed in the middle section, and an air inlet hole formed in the lower section; an upwardly protruding sealing convex ring is provided on the bottom plate of the valve core hole outside the upper end of the air inlet hole, and the upper top surface of the sealing convex ring is an arc surface;

[0008] An intermediate body, wherein the lower end of the intermediate body is screwed into the mounting hole, and the upper end of the intermediate body is provided with an air outlet joint; a spacer ring is screwed inside the middle section of the intermediate body, a spring seat is provided at the lower end of the spacer ring, and a pressure spring is provided below the spring seat;

[0009] The valve core is slidably installed in the valve core hole, and a spring hole that can cooperate with the pressure spring is provided at the upper end of the valve core; a plurality of vent holes are evenly distributed on the circumference of the middle side wall of the valve core, and an exhaust hole connecting the spring hole and the vent hole is provided in the valve core; a plunger is provided at the lower end of the valve core, and a sealing sleeve that can cooperate with the sealing convex ring is provided on the plunger.

[0010] Preferably, the outer diameter of the lower end surface of the valve core is 0.7-0.9 times the diameter of the valve core hole, and the outer diameter of the upper end surface of the valve core is 1.1-1.2 times the inner diameter of the lower end of the intermediate body.

[0011] Preferably, a sealing ring is provided between the intermediate body and the bottom shell.

[0012] Preferably, the mounting hole is a stepped hole, and the lower end surface of the intermediate body can match with the step of the mounting hole.

[0013] Preferably, a hexagonal torsion cam ring protruding outward is provided in the middle of the air outlet connector.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] The utility model adopts a split structure to avoid the occurrence of a long inner hole during the processing, which is convenient for processing and installation; the added arc-shaped sealing convex ring increases the area of the sealing ring surface, reduces the sealing specific pressure required by the sealing surface, reduces trace leakage, makes the sealing effect better, prevents damage to the sealing sleeve, and extends the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0017] Figure 2 for Figure 1 A in the enlarged view.

[0018] Figure 3 This is the external outline of the air outlet connector of the present invention.

[0019] In the figure: 1. bottom shell; 2. mounting hole; 3. valve core hole; 4. air inlet hole; 5. sealing cam; 6. intermediate body; 7. air outlet joint; 8. spacer ring; 9. spring seat; 10. pressure spring; 11. spring hole; 12. vent hole; 13. exhaust hole; 14. plunger; 15. sealing sleeve; 16. sealing ring; 17. step; 18. hexagonal torque cam. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0021] This embodiment provides a split low-pressure hydrogen safety valve structure, including a bottom shell 1, an intermediate body 6, and a valve core 20. The bottom shell 1 provides mounting support for various components. The intermediate body 6 and the bottom shell 1 form a complete valve body, which is easy to install. The valve core 20 realizes valve opening and closing by displacement.

[0022] like Figure 1-Figure 3As shown, the bottom shell 1 has a mounting hole 2 formed inside the upper section of the bottom shell 1, a valve core hole 3 formed inside the middle section of the bottom shell 1, and an air inlet hole 4 formed inside the lower section of the bottom shell 1; an upwardly protruding sealing convex ring 5 is provided on the bottom plate of the valve core hole 3 outside the upper end of the air inlet hole 4, and the upper top surface of the sealing convex ring 5 is a circular arc surface. Compared with a flat ridged structure, the circular arc surface of the sealing convex ring 5 will not damage the sealing sleeve 15 when in contact with the sealing sleeve 15, and the sealing area is increased, the sealing specific pressure required by the sealing surface is reduced, and trace leakage is reduced, so that the sealing effect is better;

[0023] Intermediate body 6, the lower end of the intermediate body 6 is screwed into the mounting hole 2, and the intermediate body 6 and the bottom shell 2 form a complete valve body. The split structure is easy to process, more conducive to the installation of internal components, and improves installation efficiency;

[0024] The upper end of the intermediate body 6 is provided with a gas outlet connector 7, which is used to connect to an external gas recovery pipeline;

[0025] A spacer ring 8 is screwed inside the middle section of the intermediate body 6, and a spring seat 9 is provided at the lower end of the spacer ring 8. The spring 9 and the intermediate body 6 are connected by threads, and the spacer ring 8 plays a role in positioning and preventing the spring seat 9 from loosening.

[0026] A pressure spring 10 is provided below the spring seat 9 and is used to compress the valve core 20;

[0027] The valve core 20 is slidably installed in the valve core hole 3. The upper end of the valve core 20 is provided with a spring hole 11 that can cooperate with the pressure spring 10. One end of the pressure spring 10 extends into the spring hole 11 to prevent the pressure spring 10 from being skewed during operation;

[0028] A plurality of vent holes 12 are evenly distributed around the circumference of the middle side wall of the valve core 20. An exhaust hole 13 is provided in the valve core 20, which connects the spring hole 11 and the vent hole 12. After the pressurized gas pushes open the valve core 20, the gas passes through the vent hole 12, the exhaust hole 13 and the spring hole 11 and can be discharged from the gas outlet connector 7.

[0029] A plunger 14 is provided at the lower end of the valve core 20 , and a sealing sleeve 15 that can cooperate with the sealing convex ring 5 is provided on the plunger 14 . The plunger 14 provides an installation space for the sealing sleeve 15 and a route for gas discharge.

[0030] Furthermore, the outer diameter of the lower end face of the valve core 20 is 0.7-0.9 times the diameter of the valve core hole 3, and the outer diameter of the upper end face of the valve core 20 is 1.1-1.2 times the inner diameter of the lower end face of the intermediate body 6. The intermediate body 6 can limit the valve core 20 to prevent the valve core 20 from moving too far.

[0031] Furthermore, a sealing ring 16 is provided between the intermediate body 6 and the bottom shell 2 , and the sealing ring 16 prevents gas leakage between the intermediate body 6 and the bottom shell 2 .

[0032] Furthermore, the mounting hole 2 is a stepped hole, and the lower end surface of the intermediate body 6 can cooperate with the step 17 of the mounting hole 2; when the lower end surface of the intermediate body 6 abuts against the step 17, the intermediate body 6 is installed in place.

[0033] Furthermore, a hexagonal torsion convex ring 18 protruding outward is provided in the middle of the air outlet connector 7 , and the hexagonal torsion convex ring 18 facilitates the installation of the air outlet connector 7 .

[0034] Working principle: The utility model adopts a split structure, and the intermediate body 6 and the bottom shell 2 form a complete valve body, which is easy to process and install. The valve core 20 obtains a downward pre-tightening force through the pressure spring 10 to maintain cooperation with the sealing convex ring 5. The upper top surface of the sealing convex ring 5 is a circular arc surface. Compared with the flat ridged structure, the circular arc surface of the sealing convex ring 5 will not damage the sealing sleeve 15 when it contacts the sealing sleeve 15, and increases the sealing area, reduces the sealing pressure required for the sealing surface, reduces trace leakage, and makes the sealing effect better; when the gas pressure is too large, the valve core 20 is pushed up, and the gas can pass through the vent 12, the exhaust hole 13, the spring hole 11 and the air outlet joint 7 and then be discharged from the valve body, which plays a protective role.

[0035] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A split low-pressure hydrogen safety valve structure, characterized in that: include: The bottom shell has a mounting hole formed in the upper section, a valve core hole formed in the middle section, and an air inlet hole formed in the lower section; an upwardly protruding sealing convex ring is provided on the bottom plate of the valve core hole outside the upper end of the air inlet hole, and the upper top surface of the sealing convex ring is an arc surface; An intermediate body, wherein the lower end of the intermediate body is screwed into the mounting hole, and the upper end of the intermediate body is provided with an air outlet joint; a spacer ring is screwed inside the middle section of the intermediate body, a spring seat is provided at the lower end of the spacer ring, and a pressure spring is provided below the spring seat; The valve core is slidably installed in the valve core hole, and a spring hole that can cooperate with the pressure spring is provided at the upper end of the valve core; a plurality of vent holes are evenly distributed on the circumference of the middle side wall of the valve core, and an exhaust hole connecting the spring hole and the vent hole is provided in the valve core; a plunger is provided at the lower end of the valve core, and a sealing sleeve that can cooperate with the sealing convex ring is provided on the plunger.

2. A split low-pressure hydrogen safety valve structure according to claim 1, characterized in that: The outer diameter of the lower end surface of the valve core is 0.7-0.9 times the diameter of the valve core hole, and the outer diameter of the upper end surface of the valve core is 1.1-1.2 times the inner diameter of the lower end of the intermediate body.

3. A split low-pressure hydrogen safety valve structure according to claim 1, characterized in that: A sealing ring is provided between the intermediate body and the bottom shell.

4. A split low-pressure hydrogen safety valve structure according to claim 1, characterized in that: The mounting hole is a stepped hole, and the lower end surface of the intermediate body can match the step of the mounting hole.

5. A split low-pressure hydrogen safety valve structure according to claim 4, characterized in that: A hexagonal torsion convex ring protruding outward is provided in the middle of the air outlet joint.

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