Hydrogen circulation pump motor seal

Abstract

The utility model discloses a kind of hydrogen circulation pump motor seal, shell portion includes first support and first cladding, the axial section of first cladding is L-shaped structure, the axial section of first support is U-shaped structure, at least part of the end of first support is embedded in first cladding, after abutting of first support and first cladding, positioning groove is formed between the two, one end of first sealing portion is equipped with first sealing lip, one end of second sealing portion is equipped with second sealing lip, first sealing portion and second sealing portion are connected in positioning groove in parallel, and first sealing lip and second sealing lip extend positioning groove for abutting shaft. The utility model first sealing portion and second sealing portion are connected in positioning groove in parallel, and be supported by positioning groove, can be stably connected with the position of first sealing portion and second sealing portion relative to shell portion, will not produce follow-up rotation problem, can be more effectively realized double seal, and seal piece is easily assembled into shape.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen circulation pump technology, and in particular to a hydrogen circulation pump motor seal. Background Technology

[0002] The hydrogen recirculation pump is one of the core components of a hydrogen fuel cell system. Its function is to recover unreacted hydrogen from the fuel cell stack and reinject it into the system to improve hydrogen utilization and maintain system pressure balance. As a critical component of the hydrogen recirculation pump, the seals directly determine the pump's sealing performance, safety, and lifespan. The core functional requirements for hydrogen recirculation pump seals are prevention of hydrogen leakage, corrosion resistance, and temperature resistance.

[0003] In the prior art, such as the novel hydrogen circulation pump seal disclosed in application number 202420355173.4, the gas-side sealing lip and the oil-side sealing lip each extend into a metal skeleton, and the lips of the gas-side sealing lip and the oil-side sealing lip simultaneously hug the rotating shaft cylindrical surface. This gives both the hydrogen side and the lubricating oil side of the hydrogen circulation pump a multi-layered composite sealing structure, ensuring that the hydrogen side and the oil side always maintain good separation. Therefore, the double-lip sealing structure can achieve better sealing performance. However, the gas-side sealing lip and the oil-side sealing lip need to be positioned and installed separately during assembly, and need to be installed in the mounting groove by insertion, which makes assembly inconvenient. Utility Model Content

[0004] The purpose of this utility model is to provide a sealing component for a hydrogen circulation pump motor. The first sealing part and the second sealing part are inserted into and supported by the positioning groove side by side. This can stably connect the positions of the first sealing part and the second sealing part relative to the shell, and will not cause rotation problems. This can more effectively achieve double sealing, and the sealing component is easy to assemble and form.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a hydrogen circulation pump motor seal, comprising: The shell includes a first support and a first covering. The axial cross-section of the first covering is L-shaped, and the axial cross-section of the first support is U-shaped. At least one end of the first support is embedded in the first covering. After the first support and the first covering abut against each other, a positioning groove is formed between them. A first sealing part and a second sealing part are arranged side by side and abut against each other. One end of the first sealing part is provided with a first sealing lip, and one end of the second sealing part is provided with a second sealing lip. The first sealing part and the second sealing part are engaged in the positioning groove, and the first sealing lip and the second sealing lip extend out of the positioning groove to abut against the shaft.

[0006] As a further optimization, the first covering is made of fluororubber, and a first wavy abutment surface is provided on the side wall away from the positioning groove.

[0007] As a further optimization, the first cover is provided with a dustproof lip.

[0008] As a further optimization, the corners of the first covering are chamfered to release the rubber compression force during installation.

[0009] As a further optimization, the first sealing part includes a second bracket and a second covering member. The axial cross-section of the second bracket is L-shaped. The second covering member at least partially wraps the second bracket, and one side is embedded in the positioning groove and abuts against the side wall of the positioning groove. The other side is formed with the first sealing lip.

[0010] As a further optimization, the second covering is made of fluororubber and has a second wavy abutment surface. The second wavy abutment surface abuts against the inner wall of the positioning groove. The wavy design facilitates assembly and installation.

[0011] As a further optimization, a groove is provided on the side of the first sealing lip near the positioning groove, and an elastic element is provided in the groove.

[0012] As a further optimization, at least a portion of the first sealing lip is provided with a PTFE coating, which can reduce the friction between the first sealing lip and the shaft and improve the sealing effect.

[0013] As a further optimization, the second sealing part includes a third bracket and a PTFE ring arranged side by side. The two sides of the third bracket abut against the first sealing part and the PTFE ring respectively, and the other side of the PTFE ring abuts against the side wall of the positioning groove, and the side of the PTFE ring extending out of the positioning groove forms the second sealing lip.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The first sealing part and the second sealing part are engaged in the positioning groove side by side and supported by the positioning groove, which can stably connect the positions of the first sealing part and the second sealing part relative to the shell, and will not cause rotation problem, thus achieving double sealing more effectively. 2. The first and second sealing parts are clamped by the positioning groove of the shell. In particular, the positioning groove is formed at one end of the shell after bending for clamping, which facilitates the assembly and forming of the entire sealing component. Attached Figure Description

[0015] Figure 1 This is a schematic diagram illustrating the application of this utility model.

[0016] Figure 2This is a schematic diagram of the shell portion of this utility model.

[0017] Figure 3 This is a schematic diagram of the first sealing part of this utility model.

[0018] Figure 4 This is an axial sectional view of the PTFE ring of this utility model.

[0019] Figure 5 This is a view of the PTFE ring of this invention along its axial direction. Detailed Implementation

[0020] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0021] like Figures 1 to 3 As shown, a hydrogen circulation pump motor seal includes a housing 10 and a first sealing part 20 and a second sealing part 30 arranged side by side and abutting each other. The housing 10 includes a first covering 11 and a first support 12. The axial cross-section of the first covering 11 is L-shaped, and the axial cross-section of the first support 12 is U-shaped. At least one end of the first support 12 is embedded in the first covering 11. After the first support 12 and the first covering 11 abut against each other, a positioning groove 100 is formed between them. One end of the first sealing part 20 is provided with a first sealing lip 211, and one end of the second sealing part 30 is provided with a second sealing lip 311. The first sealing part 20 and the second sealing part 30 are engaged in the positioning groove 100, and the first sealing lip 211 and the second sealing lip 311 extend out of the positioning groove to abut against the shaft 40. The first sealing lip 211 is used to seal oil to prevent leakage, and the second sealing lip 311 serves as a second layer of protection to increase sealing performance. The first sealing lip 211 and the second sealing lip 311 cooperate to achieve a double seal.

[0022] In this utility model, the first sealing part 20 and the second sealing part 30 are locked together in the positioning groove 100 side by side. On the one hand, this facilitates the assembly of the entire sealing component. On the other hand, the locking and positioning method can stably connect the positions of the first sealing part 20 and the second sealing part 30 relative to the shell part 10. That is, when the sealing component is installed on the shaft 40 or during use, the relative positions of the first sealing part 20 and the second sealing part 30 are stable and will not rotate, which can more effectively ensure the sealing performance.

[0023] Specifically, the first end 12a of the U-shaped structure of the first frame 12 is embedded in one end of the L-shaped structure of the first covering member 11. The other end of the L-shaped structure of the first covering member 11 is connected to the first frame 12. The second end 12b of the U-shaped structure of the first frame 12 is bent to form a positioning groove 100. Three abutting surfaces are formed in the positioning groove 100: a first abutting surface 1001 formed on the side of the first covering member 11 near the positioning groove 100, and a second abutting surface 1002 and a third abutting surface 1003 formed on the side of the first frame 12 near the positioning groove 100. The second abutting surface 1002 limits and supports the portions of the first sealing part 20 and the second sealing part 30 that extend into the positioning groove. The first abutting surface 1001 and the third abutting surface 1003 together clamp the first sealing part 20 and the second sealing part 30 that are arranged side by side. It should be noted that the forming process of the positioning groove 100 formed by the first covering 11 and the first bracket 12 can be as follows: In the initial stage of the assembly of the first skeleton 12 and the first covering 11, the second end 12b is in an extended state rather than a bent state relative to its middle position (i.e., the position where the second abutment surface 1002 is formed). When the second sealing part 30 and the first sealing part 20 are placed to abut against the first abutment surface 1001 and the second abutment surface 1002, the second end 12b is bent to bend it towards the side closer to the first end 12a and then the first sealing part 20 is pressed. This can easily realize the assembly of the sealing parts, and will not cause deformation of the first sealing part 20 and the second sealing part 30 during the assembly process. Preferably, the first covering 11 is made of fluororubber, and a first wavy abutment surface 111 is provided on the side wall away from the positioning groove 100. The first wavy abutment surface 111 can better adapt to shell materials with a large coefficient of expansion, ensuring the connection with the shell. In addition, the first bracket 12 is made of stainless steel, which can improve its rust resistance.

[0024] The first covering 11 is provided with a dustproof lip 112, which can prevent impurities from entering and improve sealing performance.

[0025] In addition, a chamfer 113 is provided at the corner of the first covering 11, which can release the rubber compression force during installation.

[0026] like Figure 2As shown, the first sealing part 20 includes a second covering 21 and a second support 22. The axial cross section of the second support 22 is L-shaped. The second covering 21 at least partially wraps the second support 22, and one side is embedded in the positioning groove 100 and abuts against the second abutting surface 1002 on the positioning groove 100. The other side is formed with a first sealing lip 211. The second support 22 also has a skeleton support function, which provides support for the second covering 21 located in the positioning groove 100 and clamped, which can ensure the structural shape of the second covering 21 and ensure the stability after being pressed by the second end 12b.

[0027] Preferably, the second covering 21 is made of fluororubber and has a second wavy abutment surface 212. The second wavy abutment surface 212 abuts against the second abutment surface 1002 of the positioning groove 100. This wavy design facilitates assembly and installation. The second covering 21 can also be provided with a chamfer 213 to release the rubber compression force during installation. In addition, the second bracket 22 is also made of stainless steel to improve rust resistance.

[0028] Furthermore, a groove 210 is provided on the first sealing lip 211 near the positioning groove 100, and an elastic element 23 is provided in the groove 210. The elastic element 23 is preferably a stainless steel spring, which can provide a certain radial force, increase the sealing performance, and has corrosion resistance. A tail of a certain length is formed on the groove 210 to prevent the elastic element 23 from disengaging from the groove 210.

[0029] The first sealing lip 211 is at least partially provided with a PTFE coating 2111, which can reduce its friction with the shaft 40 and improve the sealing performance.

[0030] like Figure 1 As shown, the second sealing part 30 includes a PTFE ring 31 and a third bracket 32 ​​arranged side by side. The two sides of the third bracket 32 ​​abut against the first sealing part 20 (i.e., the second covering 21) and the PTFE ring 31, respectively. The other side of the PTFE ring 31 abuts against the first contact surface 1001 (i.e., the first covering 11) of the positioning groove 100. The side of the PTFE ring 31 extending out of the positioning groove 100 forms the second sealing lip 311. The third bracket 32 ​​is preferably made of stainless steel. As a support between the PTFE ring 31 and the second covering 21, its rigid structure can press to both sides to ensure stability. In addition, it can provide a gap between the first sealing lip 211 and the second sealing lip 311 so that the two can smoothly achieve abutment deformation.

[0031] Combination Figure 4 and Figure 5As shown, the PTFE ring 31 is further provided with an oil return line 3111. In particular, the oil return line 3111 on the second sealing lip 311 can reduce the contact area between the PTFE ring 31 and the shaft 40, effectively reducing wear. In the design of the oil return line 3111, bending points should be avoided to reduce the risk of breakage of the PTFE ring 31.

[0032] Preferably, the first sealing part 20 (i.e. the second covering part 21) is provided with a groove 2110. The presence of the groove 2110 can increase the following of the sealing lip, and on the other hand, it provides a certain space for matching the position of the second sealing lip 311.

[0033] In addition, the first covering part 11 and the second covering part 21 are respectively provided with a first groove 114 and a second groove 214 for positioning during their respective molding processes.

[0034] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A sealing component for a hydrogen circulation pump motor, characterized in that, include: The shell includes a first support and a first covering. The axial cross-section of the first covering is L-shaped, and the axial cross-section of the first support is U-shaped. At least one end of the first support is embedded in the first covering. After the first support and the first covering abut against each other, a positioning groove is formed between them. A first sealing part and a second sealing part are arranged side by side and abut against each other. One end of the first sealing part is provided with a first sealing lip, and one end of the second sealing part is provided with a second sealing lip. The first sealing part and the second sealing part are engaged in the positioning groove, and the first sealing lip and the second sealing lip extend out of the positioning groove to abut against the shaft.

2. The hydrogen circulation pump motor seal according to claim 1, characterized in that, The first covering is made of fluororubber, and a first wavy abutment surface is provided on the side wall away from the positioning groove.

3. The hydrogen circulation pump motor seal according to claim 1 or 2, characterized in that, The first cover is provided with a dustproof lip.

4. The hydrogen circulation pump motor seal according to claim 1 or 2, characterized in that, The corners of the first covering are chamfered.

5. The hydrogen circulation pump motor seal according to claim 1, characterized in that, The first sealing part includes a second bracket and a second covering. The axial cross-section of the second bracket is L-shaped. The second covering at least partially wraps the second bracket, and one side is embedded in the positioning groove and abuts against the side wall of the positioning groove. The other side is formed with the first sealing lip.

6. The hydrogen circulation pump motor seal according to claim 5, characterized in that, The second covering is made of fluororubber and has a second wavy abutment surface that abuts against the inner wall of the positioning groove.

7. The hydrogen circulation pump motor seal according to claim 1 or 5, characterized in that, The first sealing lip has a groove on the side near the positioning groove, and an elastic element is provided in the groove.

8. The hydrogen circulation pump motor seal according to claim 1 or 5, characterized in that, The first sealing lip is at least partially coated with a PTFE coating.

9. The hydrogen circulation pump motor seal according to claim 1, characterized in that, The second sealing part includes a third bracket and a PTFE ring arranged side by side. The two sides of the third bracket abut against the first sealing part and the PTFE ring respectively, and the other side of the PTFE ring abuts against the side wall of the positioning groove, and the side of the PTFE ring extending out of the positioning groove forms the second sealing lip.

Images