Novel hydrogen circulating pump sealing element

Abstract

The utility model discloses a novel sealing element for a hydrogen circulating pump, which belongs to the technical field of hydrogen circulating pumps and comprises a shell, lip sides of a gas side sealing lip and an oil side sealing lip respectively extend out of a metal framework, and the lip sides of the gas side sealing lip and the oil side sealing lip simultaneously hold the cylindrical surface of a rotating shaft. Supporting assemblies are arranged between the lip edge of the oil side sealing lip and the metal framework and between the lip edge of the gas side sealing lip and the metal framework. According to the utility model, the lip edges of the gas side sealing lip and the oil side sealing lip simultaneously hold the cylindrical surface of the rotating shaft of the hydrogen circulating pump for sealing, so as to prevent hydrogen from leaking into a gear chamber and prevent lubricating oil in the gear chamber from leaking into the hydrogen chamber; and meanwhile, through the two supporting assemblies, the attaching contact tightness of the lip edge of the oil side sealing lip, the lip edge of the gas side sealing lip and the cylindrical surface of the rotating shaft is further improved, so that the hydrogen side and the lubricating oil side of the hydrogen circulating pump are each provided with a multi-layer composite sealing structure, and the hydrogen side and the oil side are well separated all the time.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen circulation pumps, in particular to a novel hydrogen circulation pump sealing component. Background Art

[0002] In recent years, hydrogen fuel cells have attracted more and more attention. The hydrogen circulation system is an important unit of the hydrogen fuel cell power module, which is used to continuously provide high-purity hydrogen with a certain pressure and flow rate to the fuel cell stack to ensure the normal electrochemical reaction in the fuel cell stack. The hydrogen circulation system ensures the water balance in the fuel cell and improves the economy of the system by recycling a large amount of hydrogen. As a power component of the hydrogen circulation system, the hydrogen circulation pump needs to provide sufficient flow and sufficient pressure of hydrogen under high sealing requirements.

[0003] After the reaction of hydrogen and oxygen in the fuel cell is completed, a hydrogen circulation pump is needed to recycle part of the hydrogen and bring the byproduct water produced by the reaction out of the fuel cell stack. The gear chamber of the hydrogen circulation pump is filled with lubricating oil, and the rotor chamber and the gear chamber need to be strictly sealed to prevent hydrogen from leaking into the gear chamber. At the same time, the lubricating oil in the gear chamber must not leak into the hydrogen chamber. However, the current fuel cell hydrogen circulation pumps at home and abroad have the technical problem of gear oil leaking into the circulating gas. The hydrogen contains oil traces, resulting in the purity of the hydrogen not meeting the use requirements. In response to the above problems, it is necessary to continuously find and explore different solutions.

[0004] Therefore, it is necessary to provide a new type of hydrogen circulation pump seal to solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a novel hydrogen circulation pump seal to solve the problem that the existing hydrogen circulation pump in the above-mentioned background technology has insufficient hydrogen sealing performance and the provided hydrogen contains oil traces, resulting in the hydrogen purity failing to meet the use requirements.

[0006] To achieve the above-mentioned purpose, the utility model solves the above-mentioned technical problems as follows: a new type of hydrogen circulation pump seal, including a shell, a metal frame and a rotating shaft, the metal frame is arranged inside the shell, and two installation grooves are provided in the metal frame, and an oil side sealing lip and a gas side sealing lip are fixed in the two installation grooves respectively, the lip edges of the gas side sealing lip and the oil side sealing lip respectively extend out of the metal frame, and the lip edges of the gas side sealing lip and the oil side sealing lip simultaneously embrace the cylindrical surface of the rotating shaft, and a support component is provided between the lip edge of the oil side sealing lip and the metal frame, and between the lip edge of the gas side sealing lip and the metal frame. The support component includes a rubber block provided between the oil side sealing lip and the metal frame, and between the gas side sealing lip and the metal frame, and the outer side wall of the rubber block is in contact with the lip edge of the oil side sealing lip, the lip edge of the gas side sealing lip and the side of the metal frame, and a closed cavity is provided inside the rubber block, and metal spring pieces arranged in an X shape are fixed in the closed cavity.

[0007] As a further solution of the utility model, the closed cavity is filled with gas, and the set gas causes the rubber block to expand so that the side wall of the rubber block is in close contact with the oil side sealing lip, the air side sealing lip and the side of the metal frame.

[0008] As a further solution of the utility model, the lip edges of the oil-side sealing lip and the gas-side sealing lip are respectively arranged toward the lubricating oil side and the hydrogen side of the hydrogen circulation pump.

[0009] As a further solution of the utility model, a thrust block for supporting the oil-side sealing lip and the gas-side sealing lip is fixed on the metal frame.

[0010] As a further solution of the utility model, a groove is provided on the metal frame, and an O-shaped rubber ring is arranged in the groove.

[0011] As a further solution of the utility model, a lip spiral line is arranged on the side of the air side sealing lip surface close to the oil side sealing lip.

[0012] Compared with the prior art, the beneficial effect of the utility model is that the lips of the air side sealing lip and the oil side sealing lip simultaneously embrace the rotating shaft cylindrical surface of the hydrogen circulation pump for sealing, so as to prevent hydrogen from leaking into the gear chamber and require that the lubricating oil in the gear chamber cannot leak into the hydrogen chamber. At the same time, the two sets of support components are used to further increase the tightness of the oil side sealing lip, the air side sealing lip and the rotating shaft cylindrical surface, thereby further improving the sealing performance, so that the hydrogen side and the lubricating oil side of the hydrogen circulation pump are equipped with a multi-level composite sealing structure, the hydrogen side and the oil side are always well separated, so that the hydrogen has extremely high purity, and the outer shell is machined into an integrated aluminum ring, avoiding the current common combination of spun parts in the industry, resulting in poor coaxiality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0014] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the local structure of the support assembly of the utility model.

[0016] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0017] 1. Support assembly; 101. Rubber block; 102. Metal spring; 103. Closed cavity; 2. O-ring; 3. Oil side sealing lip; 4. Groove; 5. Gas side sealing lip; 6. Metal skeleton; 7. Rotating shaft; 8. Mounting groove; 9. Thrust block; 10. Lip spiral line. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the embodiments.

[0019] See also Figure 1-2 The utility model provides a novel hydrogen circulation pump seal, including a shell, a metal frame 6 and a rotating shaft 7. The metal frame 6 is arranged inside the shell. Two mounting grooves 8 are provided in the metal frame 6. The oil side sealing lip 3 and the gas side sealing lip 5 are fixed in the two mounting grooves 8 respectively. The lip edges of the gas side sealing lip 5 and the oil side sealing lip 3 extend out of the metal frame 6 respectively, and the lip edges of the gas side sealing lip 5 and the oil side sealing lip 3 simultaneously embrace the cylindrical surface of the rotating shaft 7. The lip edge of the oil side sealing lip 3 and the metal frame 6, the lip edge of the gas side sealing lip 5 and the metal frame 6 are connected to the cylindrical surface of the rotating shaft 7. A support assembly 1 is provided between the metal skeleton 6, and the support assembly 1 includes a rubber block 101 provided between the oil side sealing lip 3 and the metal skeleton 6, and between the gas side sealing lip 5 and the metal skeleton 6. The outer wall of the rubber block 101 is in contact with the lip edge of the oil side sealing lip 3, the lip edge of the gas side sealing lip 5 and the side of the metal skeleton 6. A closed cavity 103 is provided inside the rubber block 101, and a metal spring 102 arranged in an X shape is fixed inside the closed cavity 103. In this embodiment, the above-mentioned seal is installed and applied to a hydrogen circulation pump, such as Figure 1As shown, the entire seal is installed in the housing of the hydrogen circulation pump, and the lips of the gas side sealing lip 5 and the oil side sealing lip 3 are respectively facing the hydrogen side and the lubricating oil side of the hydrogen circulation pump, and the lips of the gas side sealing lip 5 and the oil side sealing lip 3 simultaneously embrace the cylindrical surface of the rotating shaft 7 of the hydrogen circulation pump for sealing, so as to prevent hydrogen from leaking into the gear chamber and require that the lubricating oil in the gear chamber cannot leak into the hydrogen chamber. At the same time, the lips of the oil side sealing lip 3 and the gas side sealing lip 5 are elastically supported by the metal spring pieces 102 arranged in an X-shaped cross, thereby further increasing the tightness of the contact between the lips of the oil side sealing lip 3 and the lips of the gas side sealing lip 5 and the cylindrical surface of the rotating shaft 7, thereby further improving the sealing performance, so that the hydrogen side and the lubricating oil side of the hydrogen circulation pump are equipped with a multi-level composite sealing structure, the hydrogen side and the oil side are always well separated, so that the hydrogen has extremely high purity, and the housing is machined into an integrated aluminum ring, avoiding the problem of poor coaxiality of the product caused by the current common combination of spun parts in the industry.

[0020] Further as Figure 2 As shown, it is worth specifically explaining that the closed cavity 103 is filled with gas, and the set gas causes the rubber block 101 to expand so that the side wall of the rubber block 101 is in close contact with the lip edge of the oil side sealing lip 3, the lip edge of the air side sealing lip 5 and the side of the metal skeleton 6; during specific operation, a certain amount of gas is filled into the closed cavity 103 to cause the rubber block 101 to expand as a whole, and the expanded rubber block 101 presses the lip edge of the oil side sealing lip 3 and the lip edge of the air side sealing lip 5, thereby further improving the tightness of the contact between the lip edge of the oil side sealing lip 3, the lip edge of the air side sealing lip 5 and the cylindrical surface of the rotating shaft 7.

[0021] Further as Figure 1 and Figure 2 As shown, it is worth to explain in detail that the lip edges of the oil-side sealing lip 3 and the gas-side sealing lip 5 are arranged toward the lubricating oil side and the hydrogen side of the hydrogen circulation pump respectively.

[0022] Further as Figure 1 and Figure 2 As shown, it is worth explaining in detail that a thrust block 9 for supporting the oil side sealing lip 3 and the gas side sealing lip 5 is fixed on the metal skeleton 6; during specific operation, the oil side sealing lip 3 and the gas side sealing lip 5 are supported and limited by the provided thrust block 9.

[0023] Further as Figure 1 and Figure 2 As shown, it is worth to explain in detail that a groove 4 is formed on the metal frame 6, and an O-shaped rubber ring 2 is arranged in the groove 4.

[0024] Further as Figure 2As shown, it is worth explaining in detail that a lip spiral line 10 is provided on the side of the surface of the air side sealing lip 5 close to the oil side sealing lip 3; during specific operation, by providing the lip spiral line 10 on the lip end of the air side sealing lip 5, the oil return function is achieved while ensuring the sealing performance.

[0025] In summary: the lips of the air side sealing lip 5 and the oil side sealing lip 3 are respectively facing the hydrogen side and the lubricating oil side of the hydrogen circulation pump, and the lips of the air side sealing lip 5 and the oil side sealing lip 3 are used to hold the cylindrical surface of the rotating shaft 7 of the hydrogen circulation pump for sealing to prevent hydrogen from leaking into the gear chamber and at the same time require that the lubricating oil in the gear chamber cannot leak into the hydrogen chamber. The two sets of support components 1 effectively increase the tightness of the contact between the lips of the oil side sealing lip 3, the lips of the air side sealing lip 5 and the cylindrical surface of the rotating shaft 7, thereby further improving the sealing performance, so that the hydrogen side and the lubricating oil side of the hydrogen circulation pump are equipped with a multi-level composite sealing structure, the hydrogen side and the oil side are always well separated, so that the hydrogen has extremely high purity, and the outer shell is machined into an integrated aluminum ring, avoiding the current common combination of spun parts in the industry, resulting in poor coaxiality of the product.

Claims

1. A novel hydrogen circulation pump seal, comprising a housing, a metal frame and a rotating shaft, characterized in that: The metal frame is arranged inside the shell, and two installation grooves are provided in the metal frame, and the oil side sealing lip and the air side sealing lip are fixed in the two installation grooves respectively, and the lip edges of the air side sealing lip and the oil side sealing lip respectively extend out of the metal frame, and the lip edges of the air side sealing lip and the oil side sealing lip simultaneously embrace the cylindrical surface of the rotating shaft, and support components are provided between the lip edge of the oil side sealing lip and the metal frame, and between the lip edge of the air side sealing lip and the metal frame. The support components include rubber blocks provided between the oil side sealing lip and the metal frame, and between the air side sealing lip and the metal frame, and the outer side wall of the rubber block is in contact with the lip edge of the oil side sealing lip, the lip edge of the air side sealing lip and the side of the metal frame, and a closed cavity is provided inside the rubber block, and metal spring pieces arranged in an X shape are fixed in the closed cavity.

2. The novel hydrogen circulation pump seal according to claim 1 is characterized in that: The closed cavity is filled with gas, and the rubber block is expanded by the provided gas so that the side wall of the rubber block is in close contact with the oil side sealing lip edge, the air side sealing lip edge and the side surface of the metal frame.

3. The novel hydrogen circulation pump seal according to claim 1 is characterized in that: The lip edges of the oil-side sealing lip and the gas-side sealing lip are respectively arranged toward the lubricating oil side and the hydrogen side of the hydrogen circulation pump.

4. The novel hydrogen circulation pump seal according to claim 3 is characterized in that: A thrust block for supporting the oil-side sealing lip and the gas-side sealing lip is fixed on the metal frame.

5. The novel hydrogen circulation pump seal according to claim 4 is characterized in that: A groove is provided on the metal frame, and an O-shaped rubber ring is arranged in the groove.

6. The novel hydrogen circulation pump seal according to claim 5 is characterized in that: A lip spiral line is arranged on the side of the air side sealing lip surface close to the oil side sealing lip.

Images