Sealing structure of hydrogen circulating pump

Abstract

The utility model relates to the field of sealing structures, in particular to a sealing structure of a hydrogen circulating pump, which comprises a fixing ring, a first sealing element, a second sealing element and an oil seal, the fixing ring is arranged at a part between an oil cavity and a compression cavity in a shell, the first sealing element is arranged on one side of the fixing ring close to the compression cavity, and the second sealing element is arranged on the other side of the fixing ring. The first sealing element comprises a plurality of annular sealing teeth facing the rotor shaft; an oil seal and a second sealing piece are arranged on the fixing ring, the oil seal is close to the oil cavity, and the second sealing piece is close to the compression cavity. By means of the design, sufficient lubrication of parts such as the rotor shaft in the shell and efficient combustion of hydrogen in the compression cavity are kept, meanwhile, good sealing of the oil cavity and the compression cavity is guaranteed, and efficient and safe operation of the hydrogen circulating pump is achieved.

Description

Technical Field

[0001] The utility model relates to the field of sealing structures, in particular to a sealing structure of a hydrogen circulation pump. Background Art

[0002] The hydrogen circulation pump is used in hydrogen fuel cell systems to re-pressurize and recycle the remaining hydrogen that participates in the chemical reaction in the system. The hydrogen fuel cell system requires the purity of the hydrogen used to meet certain standards, because the content of impurities such as sulfur, carbon and ammonia in hydrogen has a significant impact on the proton exchange membrane and catalyst of the fuel cell, which may shorten the service life of the fuel cell. The rotor shaft in the traditional hydrogen circulation pump needs to fit in the oil chamber at one end and in the compression chamber at the other end, so it is necessary to use gas seals and seals to seal the oil chamber and compression chamber respectively. However, hydrogen is easy to leak, and when hydrogen leaks into the environment, it will cause dangerous factors. Therefore, single-stage gas seals and seals still have the risk of hydrogen leakage or lubricating oil in the oil chamber leaking into the compression chamber, affecting the purity of the hydrogen. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a sealing structure of a hydrogen circulation pump which adopts a multi-stage sealing design and can ensure good sealing and hydrogen purity.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a sealing structure of a hydrogen circulation pump, which is arranged in a shell of the hydrogen circulation pump, one side of the shell is an oil chamber, and the other side is a compression chamber. A rotor shaft is arranged in the shell, including a fixing ring, a first seal, a second seal and an oil seal. The fixing ring is arranged in a part of the shell between the oil chamber and the compression chamber. A first seal is arranged on a side of the fixing ring close to the compression chamber, and the first seal includes a plurality of annular sealing teeth facing the rotor shaft; an oil seal and a second seal are arranged on the fixing ring, the oil seal is close to the oil chamber, and the second seal is close to the compression chamber.

[0005] Furthermore, a third sealing member is included, and the third sealing member is provided on one side of the fixing ring adjacent to the housing.

[0006] Furthermore, a fourth sealing member is included, and the fourth sealing member is provided on a side of the first sealing member adjacent to the shell.

[0007] Furthermore, it also includes a spacer ring, the fixing ring is provided with a spacer ring, and the spacer ring is arranged between the second sealing member and the oil seal.

[0008] Furthermore, the fixing ring and the spacer ring are both provided with through holes, the shell is provided with a discharge hole, one end of the discharge hole is connected with the through holes of the fixing ring and the spacer ring, and the other end is connected with an external pipeline.

[0009] Furthermore, it also includes a bearing and an adjusting ring; a gear cavity is provided on the side adjacent to the oil cavity in the shell, and an adjusting ring and a bearing are provided in sequence on the side of the fixed ring close to the oil cavity, and the bearing gap is connected with the gear cavity; a through hole is provided on the adjusting ring; an oil return hole is provided on the shell, one end of the oil return hole is connected with the through hole on the adjusting ring, and the other end is connected with the gear cavity.

[0010] Furthermore, the fixing ring is provided with sealing members at the portions adjacent to the shell body on both sides of the corresponding discharge hole.

[0011] Furthermore, it also includes a first anti-rotation pin, which connects the fixing ring and the shell.

[0012] Furthermore, it also includes a second anti-rotation pin, wherein the second anti-rotation pin connects the fixing ring and the first sealing member.

[0013] Furthermore, the second seal and the oil seal are single-lip seals, the lip of the second seal faces one side of the compression chamber, and the lip of the oil seal faces one side of the oil chamber.

[0014] The beneficial effects of the utility model are as follows: a multi-stage seal is formed for the hydrogen in the compression chamber through the second seal on the fixed ring and the first seal, and a labyrinth seal is formed in combination with the annular seal tooth design of the first seal, so that a series of interception gaps and expansion cavities can be formed between the teeth, and a throttling effect is generated when the hydrogen in the compression chamber passes through the gaps of the tortuous labyrinth, thereby preventing the hydrogen in the compression chamber from flowing to the outside; at the same time, due to the gap between the first seal and the rotor shaft, there is no contact, no lubrication is required, and thermal expansion is allowed, so this sealing form is suitable for high temperature, high pressure, and high speed occasions; the lubricating oil in the oil chamber is sealed by the oil seal on the fixed ring; the above design ensures good sealing of the oil chamber and the compression chamber while maintaining sufficient lubrication of the rotor shaft and other components inside the shell and efficient combustion of the hydrogen in the compression chamber, thereby realizing efficient and safe operation of the hydrogen circulation pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the sealing structure of the hydrogen circulation pump according to a specific implementation manner of the utility model.

[0016] Description of labels:

[0017] 1. First seal; 2. Fourth seal; 3. Second anti-rotation pin; 4. Second seal; 5. Rotor shaft; 6. Retaining ring; 7. Spacer ring; 8. Oil seal; 9. Oil return hole; 10. Washer; 11. First fastener; 12. Gear; 13. Gear cavity; 14. Second fastener; 15. Baffle; 16. Housing; 17. Bearing; 18. Adjusting ring; 19. Discharge hole; 20. Fifth seal; 21. Third seal; 22. First anti-rotation pin. DETAILED DESCRIPTION

[0018] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0019] Please refer to Figure 1 A sealing structure of a hydrogen circulation pump is arranged in a housing 16 of the hydrogen circulation pump, one side of the housing 16 is an oil chamber, and the other side is a compression chamber. A rotor shaft 5 is arranged in the housing 16, characterized in that it includes a fixing ring 6, a first seal 1, a second seal 4 and an oil seal 8. The fixing ring 6 is arranged in a portion of the housing 16 between the oil chamber and the compression chamber. The fixing ring 6 is provided with a first seal 1 on a side close to the compression chamber, and the first seal 1 includes a plurality of annular sealing teeth facing the rotor shaft 5; an oil seal 8 and a second seal 4 are provided on the fixing ring 6, the oil seal 8 is close to the oil chamber, and the second seal 4 is close to the compression chamber.

[0020] From the above description, it can be seen that the beneficial effects of the utility model are: a multi-stage seal is formed for the hydrogen in the compression chamber through the second seal 4 on the fixed ring 6 and the first seal 1, and at the same time, a labyrinth seal is formed in combination with the annular seal tooth design of the first seal 1, which can form a series of interception gaps and expansion cavities between the teeth, and a throttling effect is generated when the hydrogen in the compression chamber passes through the gaps of the tortuous labyrinth, thereby preventing the hydrogen in the compression chamber from flowing to the outside; at the same time, due to the gap between the first seal 1 and the rotor shaft 5, there is no contact, no lubrication is required, and thermal expansion is allowed, so this sealing form is suitable for high temperature, high pressure, and high speed occasions; the lubricating oil in the oil chamber is sealed by the oil seal 8 on the fixed ring 6; the above design ensures good sealing of the oil chamber and the compression chamber while maintaining sufficient lubrication of the rotor shaft 5 and other components inside the housing 16 and efficient combustion of hydrogen in the compression chamber, thereby realizing efficient and safe operation of the hydrogen circulation pump.

[0021] Furthermore, a third sealing member 21 is included. The third sealing member 21 is disposed on one side of the fixing ring 6 adjacent to the housing 16 .

[0022] It can be seen from the above description that the design of the third sealing member 21 prevents the leakage of lubricating oil or hydrogen at the contact surface between the fixing ring 6 and the housing 16 .

[0023] Furthermore, a fourth sealing member 2 is included. The fourth sealing member 2 is provided on a side of the first sealing member 1 adjacent to the housing 16 .

[0024] It can be seen from the above description that the design of the fourth sealing member 2 prevents hydrogen from leaking along the contact surface between the first sealing member 1 and the housing 16 .

[0025] Furthermore, it also includes a spacer ring 7 . The fixing ring 6 is provided with the spacer ring 7 . The spacer ring 7 is provided between the second sealing member 4 and the oil seal 8 .

[0026] It can be seen from the above description that the second sealing member 4 and the oil seal 8 are separated by the spacer ring 7 .

[0027] Furthermore, the fixing ring 6 and the spacer ring 7 are both provided with through holes, and the shell 16 is provided with a discharge hole 19 , one end of the discharge hole 19 is connected to the through holes of the fixing ring 6 and the spacer ring 7 , and the other end is connected to an external pipeline.

[0028] From the above description, it can be seen that in order to prevent the air seal and oil seal 8 from failing and leaking after long-term operation, the discharge hole 19 of the shell 16 is connected with the through holes of the fixing ring 6 and the spacer ring 7, so that the leaked lubricating oil or hydrogen will not enter the compression chamber or the oil chamber, but will flow into the discharge hole 19 through the through holes of the spacer ring 7 and the fixing ring 6, and then be recycled through the external pipeline connected to the discharge hole 19.

[0029] Furthermore, it also includes a bearing 17 and an adjusting ring 18; a gear chamber 13 is provided on the side adjacent to the oil chamber in the housing 16, and an adjusting ring 18 and a bearing 17 are provided in sequence on the side of the fixing ring 6 close to the oil chamber, and the gap of the bearing 17 is connected with the gear chamber 13; a through hole is provided on the adjusting ring 18; an oil return hole 9 is provided on the housing 16, and one end of the oil return hole 9 is connected with the through hole on the adjusting ring 18, and the other end is connected with the gear chamber 13.

[0030] As can be seen from the above description, the bearing 17 cooperates with the rotor shaft 5 and is lubricated by the lubricating oil; through the communication and cooperation between the gear cavity 13 and the gap of the bearing 17, the lubricating oil in the gear cavity 13 can enter the oil cavity to lubricate the rotor shaft 5 and the oil seal 8, thereby avoiding the increase of the gap between the oil seal 8 and the high-speed rotating rotor shaft 5 due to insufficient lubrication and severe wear, and can cool the oil seal 8 to ensure the sealing effect of the oil seal 8 and extend the service life of the oil seal 8; then the lubricating oil flows into the oil return hole 9 through the through hole of the adjusting ring 18 and flows back to the gear cavity 13, thereby avoiding the accumulation of lubricating oil in the cavity and increasing the risk of lubricating oil leakage.

[0031] Furthermore, the fixing ring 6 is provided with sealing members at the portions adjacent to the housing 16 on both sides of the corresponding discharge hole 19 .

[0032] It can be seen from the above description that the sealing design of the two sides of the fixing ring 6 and the adjacent parts of the shell 16 can prevent the leakage of hydrogen and lubricating oil from the contact surface between the fixing ring 6 and the shell 16.

[0033] Furthermore, it also includes a first anti-rotation pin 22 , which connects the fixing ring 6 and the housing 16 .

[0034] It can be known from the above description that, by providing the first anti-rotation pin 22 , the fixing ring 6 and the housing 16 can be fixed to prevent the two from rotating relative to each other.

[0035] Furthermore, it also includes a second anti-rotation pin 3 , which connects the fixing ring 6 and the first sealing member 1 .

[0036] It can be seen from the above description that, by providing the second anti-rotation pin 3 , the fixing ring 6 and the first sealing member 1 can be fixed to prevent the two from rotating relative to each other.

[0037] Furthermore, the second seal 4 and the oil seal 8 are single-lip seals, the lip of the second seal 4 faces one side of the compression chamber, and the lip of the oil seal 8 faces one side of the oil chamber.

[0038] It can be seen from the above description that the design of the second sealing member 4 and the oil seal 8 of the single-lip sealing member can achieve good sealing of the lubricating oil in the oil chamber and the hydrogen in the compression chamber.

[0039] Embodiment 1:

[0040] Application scenario: In the traditional hydrogen circulation pump, the rotor shaft 5 needs to be fitted in the oil chamber at one end and in the compression chamber at the other end, so the oil chamber and the compression chamber need to be sealed by gas seal and sealing respectively. However, hydrogen is easy to leak, and when hydrogen leaks into the environment, it will cause dangerous factors. Therefore, single-stage gas seal and sealing still have the risk of hydrogen leakage or lubricating oil in the oil chamber leaking into the compression chamber, affecting the purity of hydrogen.

[0041] like Figure 1 As shown, the sealing structure of the hydrogen circulation pump of this embodiment is arranged in a housing 16 of the hydrogen circulation pump, one side of the housing 16 is an oil chamber, and the other side is a compression chamber, and a rotor shaft 5 is arranged in the housing 16; a gear chamber 13 is arranged on the side adjacent to the oil chamber in the housing 16, and a gear 12 is arranged in the gear chamber 13, one end of the rotor shaft 5 extends into the gear chamber 13 to cooperate with the gear 12, and is fixed to the gear chamber 13 by a first fastener 11 and a washer 10; a second fastener 14 and a baffle 15 are also arranged on the housing 16 opposite to the gear 12; a bearing 17 is arranged in the oil chamber corresponding to the rotor shaft 5.

[0042] The sealing structure includes a fixing ring 6, a first sealing member 1, a second sealing member 4, an oil seal 8, a third sealing member 21, a fourth sealing member 2, a fifth sealing member 20, a spacer ring 7, a discharge hole 19, an adjusting ring 18, an oil return hole 9, a first anti-rotation pin 22 and a second anti-rotation pin 3.

[0043] The fixing ring 6 is arranged in the part between the oil chamber and the compression chamber in the shell 16, and the first anti-rotation pin 22 connects the fixing ring 6 and the shell 16; the fixing ring 6 is provided with a first seal 1 on the side close to the compression chamber, and the second anti-rotation pin 3 connects the fixing ring 6 and the first seal 1; the first seal 1 includes a plurality of annular sealing teeth facing the rotor shaft 5; the fixing ring 6 is provided with an oil seal 8, a spacer ring 7 and a second seal 4, the oil seal 8 is close to the oil chamber, and the second seal 4 is close to the compression chamber; the spacer ring 7 is arranged between the oil seal 8 and the second seal 4; the second seal 4 and the oil seal 8 are single-lip seals, the lip of the second seal 4 faces the compression chamber side, and the lip of the oil seal 8 faces the oil chamber side.

[0044] The fixing ring 6 and the spacer ring 7 are both provided with through holes, and the housing 16 is provided with a discharge hole 19, one end of the discharge hole 19 is connected to the through holes of the fixing ring 6 and the spacer ring 7, and the other end is connected to the external pipeline. The fixing ring 6 is provided with a third sealing member 21 and a fifth sealing member 20 at the portions adjacent to the housing 16 on both sides of the discharge hole 19.

[0045] A fourth sealing member 2 is provided on one side of the first sealing member 1 adjacent to the housing 16 .

[0046] The fixing ring 6 is provided with an adjusting ring 18 and a bearing 17 in sequence on one side close to the oil chamber, and the gap of the bearing 17 is connected with the gear chamber 13; the adjusting ring 18 is provided with a through hole; the housing 16 is provided with an oil return hole 9, and one end of the oil return hole 9 is connected with the through hole on the adjusting ring 18, and the other end is connected with the gear chamber 13.

[0047] Working principle: On one side of the compression chamber, a seal is formed by the cooperation of the second seal 4 on the fixed ring 6 and the first seal 1. The first seal 1 is close to the compression chamber and serves as a front seal. It adopts a labyrinth seal form. The design of the annular seal teeth relative to the rotor shaft 5 forms a series of interception gaps and expansion cavities between the teeth. When the hydrogen in the compression chamber passes through the gaps of the tortuous labyrinth, a throttling effect is generated, thereby preventing the hydrogen in the compression chamber from flowing to the outside. Since there is a gap between the first seal 1 and the rotor shaft 5, there is no contact, no lubrication is required, and thermal expansion is allowed, so this sealing form is suitable for high temperature, high pressure, and high speed occasions.

[0048] On one side of the oil chamber, the oil seal 8 is sealed. For the lubrication of the oil seal 8, the gear chamber 13, the bearing 17, the adjustment ring 18 and the oil return hole 9 are designed, and the lubricating oil flowing into the gap of the bearing 17 in the gear chamber 13 is used to lubricate and cool the oil seal 8, and then the lubricating oil flows back to the gear chamber 13 through the through hole of the adjustment ring 18 and the oil return hole 9.

[0049] When the gas seal and oil seal 8 fail after long-term use, the lubricating oil or hydrogen can be discharged from the shell 16 for recycling through the design of the through holes of the spacer ring 7 and the fixing ring 6, without leaking into the chamber on the other side.

[0050] In summary, the sealing structure of the hydrogen circulation pump provided by the utility model forms a multi-stage seal for the hydrogen in the compression chamber through the second seal on the fixed ring and the first seal, and at the same time forms a labyrinth seal in combination with the annular sealing tooth design of the first seal, which can form a series of interception gaps and expansion cavities between the teeth. When the hydrogen in the compression chamber passes through the gaps of the tortuous labyrinth, a throttling effect is generated, thereby preventing the hydrogen in the compression chamber from flowing to the outside; at the same time, due to the gap between the first seal and the rotor shaft, there is no contact, no lubrication is required, and thermal expansion is allowed, so this sealing form is suitable for high temperature, high pressure, and high speed occasions; the lubricating oil in the oil chamber is sealed by the oil seal on the fixed ring; the above design ensures good sealing of the oil chamber and the compression chamber while maintaining sufficient lubrication of the rotor shaft and other components inside the shell and efficient combustion of the hydrogen in the compression chamber, thereby realizing efficient and safe operation of the hydrogen circulation pump.

[0051] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A sealing structure of a hydrogen circulation pump, which is arranged in a housing of the hydrogen circulation pump, one side of the housing is an oil chamber, and the other side is a compression chamber, and a rotor shaft is arranged in the housing, characterized in that: The invention comprises a fixing ring, a first sealing member, a second sealing member and an oil seal. The fixing ring is arranged in a part of the housing between the oil chamber and the compression chamber. The fixing ring is provided with a first sealing member on a side close to the compression chamber. The first sealing member comprises a plurality of annular sealing teeth facing the rotor shaft. The fixing ring is provided with an oil seal and a second sealing member. The oil seal is close to the oil chamber, and the second sealing member is close to the compression chamber.

2. The sealing structure of the hydrogen circulation pump according to claim 1, characterized in that: It also includes a third sealing component, and the third sealing component is provided on one side of the fixing ring adjacent to the housing.

3. The sealing structure of the hydrogen circulation pump according to claim 1, characterized in that: It also includes a fourth sealing component, and a fourth sealing component is provided on a side of the first sealing component adjacent to the housing.

4. The sealing structure of the hydrogen circulation pump according to claim 1, characterized in that: It also includes a spacer ring, which is arranged on the fixing ring and is arranged between the second sealing member and the oil seal.

5. The sealing structure of the hydrogen circulation pump according to claim 4, characterized in that: The fixing ring and the spacer ring are both provided with through holes, and the shell is provided with a discharge hole. One end of the discharge hole is communicated with the through holes of the fixing ring and the spacer ring, and the other end is communicated with an external pipeline.

6. The sealing structure of the hydrogen circulation pump according to claim 1, characterized in that: It also includes a bearing and an adjusting ring; a gear cavity is provided on the side adjacent to the oil cavity in the shell, an adjusting ring and a bearing are provided in sequence on the side of the fixed ring close to the oil cavity, and the bearing gap is connected with the gear cavity; a through hole is provided on the adjusting ring; an oil return hole is provided on the shell, one end of the oil return hole is connected with the through hole on the adjusting ring, and the other end is connected with the gear cavity.

7. The sealing structure of the hydrogen circulation pump according to claim 4, characterized in that: The fixing ring is provided with sealing elements at the parts adjacent to the shell body on both sides of the corresponding discharge hole.

8. The sealing structure of the hydrogen circulation pump according to claim 1, characterized in that: It also includes a first anti-rotation pin, which connects the fixing ring and the housing.

9. The sealing structure of the hydrogen circulation pump according to claim 1, characterized in that: It also includes a second anti-rotation pin, which connects the fixing ring and the first sealing member.

10. The sealing structure of the hydrogen circulation pump according to claim 1, characterized in that: The second seal and the oil seal are single-lip seals, the lip of the second seal faces one side of the compression chamber, and the lip of the oil seal faces one side of the oil chamber.

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