High-pressure ball valve for hydrogen supply device of hydrogen fuel cell

Abstract

The utility model belongs to the technical field of valves, and relates to a high-pressure ball valve for a hydrogen supply device of a hydrogen fuel cell, which comprises a middle valve body, two sides of a valve cavity of the middle valve body are respectively provided with a side valve body, and one end of each side valve body corresponding to the valve cavity is respectively provided with a valve seat assembly; the valve ball is rotationally arranged between the two valve seat assemblies, the upper end of the middle valve body is connected with an upper cover in a sealed mode, a valve rod of the valve ball penetrates through an inner hole of the upper cover and extends upwards, and a packing assembly is arranged between the valve rod and the inner hole of the upper cover and is pressed and fixed through a packing gland and a packing pressing plate. The valve seat assembly comprises a belleville spring, a supporting ring and a valve seat which are arranged in the side valve body installation cavity, a fireproof rope is arranged between the circumferential surface of the valve seat and the side valve body, and one end of the belleville spring abuts against the bottom face of the cavity of the side valve body. The high-pressure ball valve can reliably and safely operate in a hydrogen supply device, and stable transmission of hydrogen is achieved; and the characteristics of low running torque when the valve is loaded, zero leakage of the sealing surfaces of the valve ball and the valve seat, no leakage at the joint of pressure-bearing parts and high response speed under high-frequency switching action can be realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves and relates to a high-pressure ball valve for a hydrogen supply device of a hydrogen fuel cell. Background Art

[0002] At present, the new energy field is mainly based on photovoltaic power generation and wind power generation. The ultimate goal of this type of power generation mode is to connect electricity to the grid. In the field of mobile power, lithium batteries are currently used as the main power source. Although there is zero emission during use, the later maintenance cost of lithium batteries is high, and the technical requirements for recycling and disposal are high. Once improperly disposed, the environmental pollution caused is permanent and irreversible, and the time for governance is far away. In view of the above situation, hydrogen fuel cells have obvious advantages as a clean energy source. After the electrochemical reaction of hydrogen at the anode and oxygen at the cathode, electricity and H2O are generated. Therefore, it has become particularly urgent to promote hydrogen fuel cells at this stage, and its hydrogen supply device is also being built simultaneously in various places. The high-pressure ball valve is the core equipment of the hydrogen supply device, and its reliable sealing performance and fast switching performance are the key. Summary of the invention

[0003] In view of the above problems, the utility model provides a high-pressure ball valve for a hydrogen supply device of a hydrogen fuel cell. The high-pressure ball valve can operate reliably and safely in the hydrogen supply device to achieve stable transmission of hydrogen.

[0004] According to the technical solution of the utility model: a high-pressure ball valve for a hydrogen fuel cell hydrogen supply device, characterized in that: it includes a middle valve body, a side valve body is respectively installed on both sides of the valve cavity of the middle valve body, and each of the side valve bodies is respectively installed with a valve seat assembly corresponding to one end of the valve cavity;

[0005] The valve ball is rotatably arranged between the two valve seat assemblies, the upper end of the middle valve body is sealed and connected to the upper cover, the valve stem of the valve ball passes through the inner hole of the upper cover and extends upward, a packing assembly is arranged between the valve stem and the inner hole of the upper cover, and the packing assembly is pressed and fixed by a packing gland and a packing pressure plate.

[0006] As a further improvement of the utility model, the valve seat assembly includes a disc spring, a support ring, and a valve seat arranged in the side valve body installation cavity. A fire rope is arranged between the circumferential surface of the valve seat and the side valve body. One end of the disc spring abuts against the bottom surface of the cavity of the side valve body, and the other end is pressed against one side end surface of the support ring. The annular cavity of the support ring is sleeved on the valve seat, and a first balancing sealing ring is sleeved on the circumferential surface of the valve seat close to one end of the support ring. The arc sealing surface of the valve seat matches the spherical sealing surface of the valve ball.

[0007] As a further improvement of the utility model, a balancing sealing ring installation step is provided at one end of the side valve body and the middle valve body, and a first inverted groove is constructed at the end of the balancing sealing ring installation step. A fourth balancing sealing ring is sleeved on the balancing sealing ring installation step to achieve sealing with the middle valve body, and the fourth balancing sealing ring is limited by the first inverted groove.

[0008] As a further improvement of the utility model, the upper part of the middle valve body is provided with a first through hole connected to the valve cavity, and second through holes are symmetrically arranged on the left and right sides of the valve cavity, the first through hole and the second through hole are both connected to the valve cavity, a positioning step is arranged at the lower part of the first through hole, and a first sealing step and a second sealing step are arranged in sequence from the outside to the inside at the end of the first through hole, and a third sealing step and a fourth sealing step are arranged in sequence from the outside to the inside at the end of the second through hole;

[0009] A first metal toothed gasket is arranged between the side valve body and the third sealing step, and a first molded graphite ring is arranged between the side valve body and the fourth sealing step;

[0010] A second metal toothed gasket is arranged between the upper cover and the first sealing step, and a second molded graphite ring is arranged between the upper cover and the second sealing step.

[0011] As a further improvement of the utility model, a second balancing sealing ring is sleeved on the valve stem of the valve ball, and the second balancing sealing ring is supported on the inner hole step of the upper cover;

[0012] A retainer is also provided in the inner cavity of the middle valve body, and the lower part of the retainer is rotatably supported on the valve ball through a plane bearing, and the outer ring of the retainer is supported on the inner hole step of the middle valve body; an upper bushing is sleeved on the valve stem, and the upper bushing is supported on the inner hole step of the retainer; the upper ends of the upper bushing and the upper ends of the retainer are both limited by the top surface of the step hole at the lower part of the upper cover; a lower bushing is sleeved on the bottom shaft of the valve ball, and the lower end of the lower bushing is limited by the step of the bottom shaft hole of the valve cavity, and the upper end of the lower bushing is limited by the limiting step of the valve ball.

[0013] As a further improvement of the utility model, a third balancing sealing ring is arranged on the circumferential surface of the step hole at the lower part of the upper cover, and a seal is formed between the third balancing sealing ring and the inner hole of the middle valve body.

[0014] As a further improvement of the utility model, a first O-ring is arranged between the packing gland and the valve stem, and a second O-ring is arranged between the packing gland and the upper cover.

[0015] As a further improvement of the utility model, the lower arc surface of the packing pressure plate is pressed tightly against the arc surface of the upper end of the packing pressure cover.

[0016] The technical effect of the utility model is that the seals of the middle valve body and the side valve body, the middle valve body and the upper cover, and the stuffing box of the utility model are a parallel sealing structure combination, which effectively eliminates the risk of medium leakage and device shutdown caused by failure of the single sealing structure of the traditional valve, and improves the operating reliability of the valve.

[0017] The valve ball and valve seat sealing surfaces are provided with a hardened layer, which can overcome the abnormalities such as scratches on the sealing surface after the valve is operated at high frequency and will not form a leakage channel.

[0018] The valve stem and bottom shaft are respectively driven with non-metallic PEEK bushings, which have obvious friction reduction effect, small dynamic torque value of valve load under high pressure difference environment, fast valve response speed, and more reasonable and economical configuration of valve actuator model.

[0019] A non-metallic PEEK plane bearing is provided between the valve stem and the retainer, which has a significant friction reduction effect. The dynamic torque value of the valve load under high pressure difference environment is small and will not cause the valve to get stuck.

[0020] The valve ball, valve stem and bottom shaft are integrally processed and formed, and the overall rigidity of the parts is good. They can withstand frequent valve switching actions under high pressure difference conditions, and the valve safety factor is improved.

[0021] The disc spring is designed with low preload specific pressure. The valve cavity retains hydrogen medium, etc., which causes the pressure to expand and realize the self-pressure relief function of the valve seat, thereby improving the safety of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the utility model.

[0023] Figure 2 This is a schematic diagram of the structure of the middle valve body of the utility model.

[0024] Figure 3 This is a schematic diagram of the side valve body structure of the utility model.

[0025] Figure 4 It is a schematic diagram of the upper cover structure of the utility model.

[0026] Figure 5 This is a schematic diagram of the valve ball structure of the utility model.

[0027] In the figure: 1, middle valve body; 1-1, valve cavity; 1-2, positioning step; 1-3, first through hole; 1-4, second through hole; 1-5, first sealing step; 1-6, second sealing step; 1-7, third sealing step; 1-8, fourth sealing step; 2, side valve body; 2-1, balancing sealing ring installation step; 3, upper cover; 4, valve ball; valve stem 4-1; bottom shaft 4-2; 5, valve seat; 6, support ring; 7, disc spring; 8, retainer; 9, first A balancing seal ring; 10. A second balancing seal ring; 11. A third balancing seal ring; 12. A fourth balancing seal ring; 13. A fire rope; 14. A lower bushing; 15. An upper bushing; 16. A plane bearing; 17. A packing assembly; 18. A packing pressure plate; 19. A packing gland; 20. A first O-ring; 21. A second O-ring; 22. A first molded graphite ring; 23. A second molded graphite ring; 24. A first metal toothed gasket; 25. A second metal toothed gasket. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0029] like Figure 1-5 As shown, the utility model is a high-pressure ball valve for a hydrogen fuel cell hydrogen supply device, which has the characteristics of low operating torque under load, zero leakage of the valve ball and valve seat sealing surface, no leakage at the matching point of the valve body and the upper cover, and fast response speed under high-frequency switching action. The utility model includes a middle valve body 1, and a side valve body 2 is respectively installed on both sides of the valve cavity 1-1 of the middle valve body 1, and each of the side valve bodies 2 is respectively installed with a valve seat assembly corresponding to one end of the valve cavity 1-1.

[0030] The valve ball 4 is rotatably arranged between the two valve seat assemblies, the upper end of the middle valve body 1 is sealed and connected to the upper cover 3, the valve stem 4-1 of the valve ball 4 passes through the inner hole of the upper cover 3 and extends upward, a packing assembly 17 is arranged between the valve stem 4-1 and the inner hole of the upper cover 3, and the packing assembly 17 is pressed and fixed by a packing gland 19 and a packing pressure plate 18. Furthermore, the lower arc surface of the packing pressure plate 18 is pressed against the arc surface at the upper end of the packing gland 19.

[0031] The valve seat assembly includes a disc spring 7, a support ring 6, and a valve seat 5 which are arranged in the installation cavity of the side valve body 2. A fire rope 13 is arranged between the circumferential surface of the valve seat 5 and the side valve body 2. One end of the disc spring 7 is against the bottom surface of the cavity of the side valve body 2, and the other end is pressed against one side end surface of the support ring 6. The annular cavity of the support ring 6 is sleeved on the valve seat 5. A first balancing sealing ring 9 is sleeved on the circumferential surface of the valve seat 5 close to one end of the support ring 6. The arc sealing surface of the valve seat 5 matches the spherical sealing surface of the valve ball 4.

[0032] like Figure 3 As shown, a balancing sealing ring installation step 2-1 is provided at one end of the side valve body 2 and the middle valve body 1, and a first inverted groove 2-2 is constructed at the end of the balancing sealing ring installation step 2-1. A fourth balancing sealing ring 12 is sleeved on the balancing sealing ring installation step 2-1 to achieve sealing with the middle valve body 1, and the fourth balancing sealing ring 12 is limited by the first inverted groove 2-2.

[0033] like Figure 2 As shown, the upper part of the middle valve body 1 is provided with a first through hole 1-3 connected to the valve cavity 1-1, and the second through holes 1-4 are symmetrically arranged on the left and right sides of the valve cavity 1-1. The first through hole 1-3 and the second through hole 1-4 are both connected to the valve cavity 1-1, and a positioning step 1-2 is arranged at the lower part of the first through hole 1-3. The end of the first through hole 1-3 is provided with a first sealing step 1-5 and a second sealing step 1-6 in sequence from the outside to the inside, and the end of the second through hole 1-4 is provided with a third sealing step 1-7 and a fourth sealing step 1-8 in sequence from the outside to the inside.

[0034] A first metal toothed gasket 24 is arranged between the side valve body 2 and the third sealing step 1-7, and a first molded graphite ring 22 is arranged between the side valve body 2 and the fourth sealing step 1-8. The first metal toothed gasket 24 and the first molded graphite ring 22 are respectively arranged in the corresponding chambers formed after the valve body 2 and the middle valve body 1 are assembled, and a double sealing structure is formed after being pre-tightened by fasteners. A balancing sealing ring installation step 2-1 is designed at the end of the side valve body 2, and a third sealing structure is formed by installing the fourth balancing sealing ring 12 and cooperating with the middle valve body 1. The first inverted groove 2-2 structure at the end can prevent the fourth balancing sealing ring 12 from being separated from the side valve body due to the medium or external force.

[0035] like Figure 4As shown, further, a second metal toothed gasket 25 is arranged between the upper cover 3 and the first sealing step 1-5, and a second molded graphite ring 23 is arranged between the upper cover 3 and the second sealing step 1-6. The upper cover 3 is installed on the first through hole 1-3 on the upper side of the valve cavity 1-1 of the middle valve body 1. The second molded graphite ring 23 and the second metal toothed gasket 25 are respectively installed in the chamber formed after the upper cover 3 and the middle valve body 1 are assembled, and a double sealing structure is formed after being pre-tightened by fasteners. A balancing sealing ring installation step 3-1 is designed at the end of the upper cover 3. The third balancing sealing ring 11 is installed to form a third sealing structure after being matched with the middle valve body 1. The second inverted groove 3-2 structure at the end can prevent the third balancing sealing ring 11 from being separated from the side valve body due to the medium or external force.

[0036] A second balancing sealing ring 10 is sleeved on the valve stem 4 - 1 of the valve ball 4 , and the second balancing sealing ring 10 is supported on the inner hole step of the upper cover 3 .

[0037] like Figure 1 , 5 As shown, the inner cavity of the middle valve body 1 is also provided with a retainer 8, the lower part of the retainer 8 is rotatably supported on the valve ball 4 through a plane bearing 16, the outer ring of the retainer 8 is supported on the inner hole step of the middle valve body 1, the valve stem 4-1 is sleeved with an upper bushing 15, the upper bushing 15 is supported on the inner hole step of the retainer 8, the upper end of the upper bushing 15 and the upper end of the retainer 8 are both limited by the top surface of the step hole at the lower part of the upper cover 3, the bottom shaft 4-2 of the valve ball 4 is sleeved with a lower bushing 14, the lower end of the lower bushing 14 is limited by the step of the bottom shaft hole of the valve cavity 1-1, and the upper end of the lower bushing 14 is limited by the limiting step of the valve ball 4. The valve ball 4, the valve stem 4-1 and the bottom shaft 4-2 are integrally processed and formed, and are a ball-rod integrated structure with good rigidity, meeting the requirements of high-frequency rapid switching.

[0038] A first O-ring 20 is arranged between the packing gland 9 and the valve stem 4 - 1 , and a second O-ring 21 is arranged between the packing gland 9 and the upper cover 3 .

[0039] The low preload specific pressure design of the disc spring 7, combined with the upper bushing 15, the lower bushing 14 and the plane bearing 16 made of PEEK with a low friction coefficient, can realize high-frequency and rapid switching of the valve.

[0040] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A high-pressure ball valve for a hydrogen fuel cell hydrogen supply device, characterized in that: It comprises a middle valve body (1), a side valve body (2) being respectively installed on both sides of a valve cavity (1-1) of the middle valve body (1), and a valve seat assembly being respectively installed on one end of each side valve body (2) corresponding to the valve cavity (1-1); The valve ball (4) is rotatably arranged between the two valve seat assemblies. The upper end of the middle valve body (1) is sealingly connected to the upper cover (3). The valve stem (4-1) of the valve ball (4) passes through the inner hole of the upper cover (3) and extends upward. A packing assembly (17) is arranged between the valve stem (4-1) and the inner hole of the upper cover (3). The packing assembly (17) is pressed and fixed by a packing gland (19) and a packing pressure plate (18).

2. The high-pressure ball valve for a hydrogen fuel cell hydrogen supply device according to claim 1, characterized in that: The valve seat assembly comprises a disc spring (7), a support ring (6), and a valve seat (5) which are arranged in the mounting cavity of the side valve body (2); a fire rope (13) is arranged between the circumferential surface of the valve seat (5) and the side valve body (2); one end of the disc spring (7) abuts against the bottom surface of the cavity of the side valve body (2), and the other end is pressed against one side end surface of the support ring (6); the annular cavity of the support ring (6) is sleeved on the valve seat (5); a first balancing sealing ring (9) is sleeved on the circumferential surface of the valve seat (5) close to one end of the support ring (6); and the arc sealing surface of the valve seat (5) matches the spherical sealing surface of the valve ball (4).

3. The high-pressure ball valve for a hydrogen fuel cell hydrogen supply device according to claim 1, characterized in that: A balancing seal ring installation step (2-1) is provided at one end of the side valve body (2) and the middle valve body (1), and a first inverted groove (2-2) is formed at the end of the balancing seal ring installation step (2-1). A fourth balancing seal ring (12) is sleeved on the balancing seal ring installation step (2-1) to achieve sealing with the middle valve body (1), and the fourth balancing seal ring (12) is limited by the first inverted groove (2-2).

4. The high-pressure ball valve for a hydrogen fuel cell hydrogen supply device according to claim 1, characterized in that: The upper part of the middle valve body (1) is provided with a first through hole (1-3) connected to the valve cavity (1-1), and second through holes (1-4) are symmetrically arranged on the left and right sides of the valve cavity (1-1); the first through hole (1-3) and the second through hole (1-4) are both connected to the valve cavity (1-1); a positioning step (1-2) is arranged at the lower part of the first through hole (1-3); a first sealing step (1-5) and a second sealing step (1-6) are arranged at the end of the first through hole (1-3) in sequence from the outside to the inside; and a third sealing step (1-7) and a fourth sealing step (1-8) are arranged at the end of the second through hole (1-4) in sequence from the outside to the inside; A first metal toothed gasket (24) is provided between the side valve body (2) and the third sealing step (1-7), and a first molded graphite ring (22) is provided between the side valve body (2) and the fourth sealing step (1-8); A second metal toothed gasket (25) is provided between the upper cover (3) and the first sealing step (1-5), and a second molded graphite ring (23) is provided between the upper cover (3) and the second sealing step (1-6).

5. The high-pressure ball valve for a hydrogen fuel cell hydrogen supply device according to claim 1, characterized in that: A second balancing seal ring (10) is sleeved on the valve stem (4-1) of the valve ball (4), and the second balancing seal ring (10) is supported on the inner hole step of the upper cover (3); The inner cavity of the middle valve body (1) is also provided with a retainer (8), the lower part of the retainer (8) is rotatably supported on the valve ball (4) through a plane bearing (16), the outer ring of the retainer (8) is supported on the inner hole step of the middle valve body (1), an upper bushing (15) is sleeved on the valve stem (4-1), the upper bushing (15) is supported on the inner hole step of the retainer (8), the upper end of the upper bushing (15) and the upper end of the retainer (8) are both limited by the top surface of the step hole at the lower part of the upper cover (3), the bottom shaft (4-2) of the valve ball (4) is sleeved with a lower bushing (14), the lower end of the lower bushing (14) is limited by the step of the bottom shaft hole of the valve cavity (1-1), and the upper end of the lower bushing (14) is limited by the limiting step of the valve ball (4).

6. The high-pressure ball valve for a hydrogen fuel cell hydrogen supply device according to claim 5, characterized in that: A third balancing sealing ring (11) is provided on the circumferential surface of the step hole at the lower part of the upper cover (3), and a seal is formed between the third balancing sealing ring (11) and the inner hole of the middle valve body (1).

7. The high-pressure ball valve for a hydrogen fuel cell hydrogen supply device according to claim 1, characterized in that: A first O-ring (20) is arranged between the packing gland (19) and the valve stem (4-1), and a second O-ring (21) is arranged between the packing gland (19) and the upper cover (3).

8. The high-pressure ball valve for a hydrogen fuel cell hydrogen supply device according to claim 1, characterized in that: The lower arc surface of the packing pressure plate (18) is pressed tightly against the upper arc surface of the packing pressure cover (19).

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