A hydrogen circulating pump oil gas seal

Abstract

The utility model discloses a kind of hydrogen circulating pump oil gas seal, and the side of the first skeleton in shell is embedded in first rubber piece and is abutted with first rubber piece, and the other side protrudes from first rubber piece, sealing assembly includes gas side seal part, first pad and oil side seal part, gas side seal part includes sealing lip and second pad, two sealing lips are respectively abutted second pad on the side close to each other, and oil side seal part includes second rubber piece and second skeleton, second skeleton is embedded in second rubber piece, the side of second rubber piece is embedded in wrapping cavity and is abutted with the inner wall of wrapping cavity, and the other side of it protrudes wrapping cavity and forms main lip at end portion.The rubber covering structure and skeleton support structure of the utility model shell can guarantee the installation stability and sealing property of shell, and main lip, first sealing lip and second sealing lip etc. In sealing assembly can realize multi-seal, and main lip can form more stable and reliable contact after abutment with shaft interference, guarantee sealing effect.

Description

Technical Field

[0001] This utility model relates to the technical field of hydrogen circulation pump devices, and in particular to an oil-gas sealing component for a hydrogen circulation pump. Background Technology

[0002] The function of the hydrogen circulation pump is to pump the hydrogen that has not undergone electrochemical reaction from the outlet to the inlet in the hydrogen circuit of the fuel cell, and to merge it with the inlet hydrogen and re-enter the fuel cell, so as to realize the recycling of hydrogen and improve the hydrogen utilization rate. The core functional requirements of the oil-gas seal of the hydrogen circulation pump are to prevent hydrogen leakage, corrosion resistance and temperature resistance.

[0003] In the prior art, such as the oil-gas seal for a hydrogen circulation pump disclosed in application number 202223590500.4, an oil seal lip, a first gas seal lip, a second gas seal lip and a rubber lip are arranged in sequence. This can effectively prevent gas in the gas chamber from leaking into the oil chamber from the gap between the outer frame and the shell. However, the oil seal lip is made of PTFE material. Since PTFE material cannot provide an effective oil-side seal, it will result in poor oil-side sealing effect, short service life, and easy intrusion of oil into the gas chamber. Utility Model Content

[0004] The purpose of this utility model is to provide an oil-gas sealing component for a hydrogen circulation pump. The rubber-coated structure and the skeleton support structure of the outer shell can ensure the installation stability and sealing performance of the outer shell. The main lip, the first sealing lip and the second sealing lip in the sealing component can achieve multiple seals, and the main lip can form a more stable and reliable contact after interference fit with the shaft, thus ensuring the sealing effect.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a hydrogen circulation pump oil-gas sealing component, comprising:

[0006] The outer shell includes a first rubber component and a first skeleton, with a cavity formed between them. One side of the first skeleton is embedded in and abuts against the first rubber component, while the other side protrudes from the first rubber component.

[0007] A sealing assembly includes a gas-side sealing portion, a first gasket, and an oil-side sealing portion that abut against each other in sequence. The gas-side sealing portion and the oil-side sealing portion abut against the sidewall of the encapsulation cavity on their respective sides away from each other. The gas-side sealing portion includes a sealing lip and a second gasket. The sealing lips abut against the second gasket on their respective sides close to each other, and abut against the inner wall of the encapsulation cavity and the oil-side sealing portion on their respective sides away from each other. The oil-side sealing portion includes a second rubber element and a second skeleton. The second skeleton is embedded in the second rubber element. One side of the second rubber element is embedded in the encapsulation cavity and abuts against the inner wall of the encapsulation cavity, while its other side extends out of the encapsulation cavity and its end forms a main lip.

[0008] As a further optimization, the first frame includes a first side plate, an extension plate, and a second side plate connected in sequence. The first side plate and the second side plate are perpendicular to the extension plate, respectively. At least a portion of the first side plate is embedded in the first rubber component, a portion of the extension plate abuts against the first rubber component, and the remaining portion protrudes from the first rubber component.

[0009] As a further optimization, the extension plate includes a first extension, an oblique extension, and a second extension connected in sequence. The oblique extension abuts against the end of the first rubber member, and the outer wall surface of the second extension is located on the opposite side of the outer wall surface of the first extension.

[0010] As a further optimization, a positioning groove is provided on the side of the main lip near the encapsulation cavity, and a spring is provided in the positioning groove to improve the sealing performance between the main lip and the shaft.

[0011] As a further optimization, the second rubber component is provided with a blade tail on the side of the positioning groove to prevent the spring from falling off.

[0012] As a further optimization, a secondary lip is provided on the second rubber component next to the main lip to enhance static airtightness.

[0013] As a further optimization, the main lip and / or the secondary lip are provided with a PTFE coating to reduce friction with the shaft and improve sealing.

[0014] As a further optimization, the two sealing lips extend in opposite directions on the side away from the encapsulation cavity.

[0015] As a further optimization, the sealing lip is provided with an oil return line, which can reduce the contact area between the sealing lip and the shaft and reduce wear.

[0016] As a further optimization, the sealing lip is made of PTFE material, which can effectively improve the wear resistance of the sealing lip.

[0017] As a further optimization, the inner diameter of the second pad is smaller than the distance between the bend point of the sealing lip and the shaft.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The rubber-coated structure and skeleton support structure of the outer shell can ensure the installation stability and sealing performance of the outer shell. The main lip, first sealing lip and second sealing lip in the sealing assembly can achieve multiple seals. The structure of the gasket blocks and other structures supports each sealing component and ensures the spacing between them, which can achieve good sealing over a large range. The structural fit between the outer shell and the sealing assembly ensures excellent sealing performance on both the shaft housing side and the shaft side.

[0020] 2. The oil-side sealing part supports the second seal through the second skeleton, ensuring that the main lip on the second seal abuts against the shaft to achieve a more reliable seal through interference fit. Attached Figure Description

[0021] Figure 1 This is a schematic diagram illustrating the application of this utility model.

[0022] Figure 2 This is a schematic diagram of the outer shell of this utility model.

[0023] Figure 3 This is a schematic diagram of the sealing component of this utility model.

[0024] Figure 4 This is a schematic diagram showing the oil return line installed on the gas-side sealing part of this utility model. Detailed Implementation

[0025] 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.

[0026] like Figures 1 to 3 As shown, a hydrogen circulation pump oil-gas seal includes a housing 10 and a sealing assembly. The housing 10 includes a first rubber element 11 and a first skeleton 12, forming an enclosure cavity 100 between them. One side of the first skeleton 12 is embedded in and abuts against the first rubber element 11, while the other side protrudes from the first rubber element 11. The sealing assembly includes a gas-side sealing portion 21, a first gasket 23, and an oil-side sealing portion 22 that abut against each other in sequence. The sides of the gas-side sealing portion 21 and the oil-side sealing portion 22 that are away from each other abut against the sidewalls of the enclosure cavity 100, respectively. The gas-side sealing portion 21 includes two sealing lips (a first sealing lip 211 and a second sealing lip 212), and a sealing lip located at two sealing lip points. The second pad 213 between the sealing lips, the side of the first sealing lip 211 and the second sealing lip 212 that is close to each other abuts against the second pad 213, and the side that is away from each other abuts against the inner wall of the encapsulation cavity 100 and the oil-side sealing part 22, respectively. Preferably, the extension directions of the side of the first sealing lip 211 and the second sealing lip 212 that is away from the encapsulation cavity 100 are opposite. The oil-side sealing part 22 includes a second rubber element 221 and a second skeleton 222. The second skeleton 222 is embedded in the second rubber element 221. One side of the second rubber element 221 is embedded in the encapsulation cavity 100 and abuts against the inner wall of the encapsulation cavity 100, and the other side extends out of the encapsulation cavity 100 and the end forms a main lip 2211.

[0027] This invention includes at least a main lip 2211, a first sealing lip 211, and a second sealing lip 212. The main lip 2211 is located near the oil side and seals against the shaft 30 to prevent leakage. The first sealing lip 211 is a PTFE lip located near the moisture side and seals against the shaft 30 after bending. Its material effectively improves its wear resistance on the moisture side. The second sealing lip 212 is also a PTFE lip and is located between the main lip 2211 and the first sealing lip 211 for sealing protection, thus improving the overall sealing performance. By providing a first pad 23 between the gas-side sealing part 21 and the oil-side sealing part 22, the entire sealing assembly extends to a corresponding length in the axial direction of the shaft 30. This allows for more stable fixation within the encapsulation cavity 100, and also ensures a suitable gap between the gas-side sealing part 21 and the oil-side sealing part 22. The spacing ensures sufficient space between the second sealing lip 212 and the shaft 30 after bending, preventing interference between the second sealing lip 212 and the oil-side sealing part 22 during sealing. Furthermore, the oil-side sealing part 22 achieves excellent sealing through the main lip 2211 on its second rubber component 221, and the second skeleton 222 embedded within the second rubber component 221 ensures support and stability when the oil-side sealing part 22 is clamped within the enclosure cavity 100. The gas-side sealing part 21, the first pad 23, and the oil-side sealing part 22 are all positioned within the enclosure cavity 100. One side of the outer shell 10 of the enclosure cavity 100 is the structure of the first rubber component 11, and the other side is a partial structure of the first skeleton 12. The deformable structure of the first rubber component 11 and the rigid structure of the first skeleton 12 abut against the shell, providing sufficient stability while ensuring outer diameter sealing, making the installation of the outer shell 10 more stable.

[0028] This invention ensures the installation stability and sealing performance of the outer shell 10 through its rubber-coated structure and skeleton support structure. The sealing assembly, with its main lip 2211, first sealing lip 211, and second sealing lip 212, can achieve multiple seals to ensure sealing performance. Furthermore, the structure of pads and other components supports each sealing component and ensures the spacing between them, achieving good sealing over a large range. Moreover, the oil-side sealing part supports the second sealing element through the second skeleton, ensuring a more reliable seal when the main lip on the second sealing element abuts against the shaft through interference fit.

[0029] Preferably, a first wave structure 11a is formed on the side of the first rubber part 11 away from the encapsulation cavity 100, which facilitates installation and can better adapt to shell materials with a large coefficient of expansion. Furthermore, a first chamfer 11b is provided at the corner of the first rubber part 11 to facilitate the release of stress during installation and compression of the first rubber part 11.

[0030] Preferably, the first frame 12 includes a first side plate 121, an extension plate 122, and a second side plate 123 connected in sequence. The first side plate 121 and the second side plate 123 are perpendicular to the extension plate 122. At least a portion of the first side plate 121 is embedded in a first fixing groove 110 within the first rubber component 11 (e.g., by overmolding, or by positioning the end of the first side plate 121 within a groove formed on the first rubber component 11). A portion of the extension plate 122 abuts against the first rubber component 11, while the remaining portion protrudes from the first rubber component 11. The U-shaped structure of the first frame 12 facilitates one end of it being attached to the first rubber component 11. The sealing component is positioned on the rubber part 11 and can be clamped by the structure. For the specific clamping method, initially the second side plate 123 may not be perpendicular to the extension plate 122. For example, the two are on the same extension surface. When the sealing component is placed in the area of ​​the encapsulation cavity 100, that is, when the adjacent sides of the sealing component abut against the first rubber part 11 and the extension plate 122 respectively, the second side plate 123 is bent so that it is perpendicular to the extension plate 122 and then abuts against the sealing component, thereby clamping the sealing component. This not only makes it easy to install the sealing component, but also has good installation stability and can prevent the rotation of each sealing component after passing through the shaft.

[0031] More specifically, the extension plate 122 includes a first extension 1221, an oblique extension 1222, and a second extension 1223 connected in sequence. The oblique extension 1222 abuts against the end of the first rubber member 11 for positioning. The outer wall surface of the second extension 1223 is located on the opposite outer side of the outer wall surface of the first extension 1221. Therefore, the first rubber member 11 (first wave structure 11a) and the second extension 1223 can jointly form a deformable structure and a rigid structure to ensure stability when abutting against the shell.

[0032] Preferably, a positioning groove 220 is provided on the side of the main lip 2211 near the encapsulation cavity 100, and a spring 223 is provided in the positioning groove 220. The spring 223 can provide a certain radial force, which can pull the main lip 2211 towards the shaft 30 to increase the sealing performance.

[0033] Furthermore, the second rubber component 221 is provided with a blade tail 2201 on the side of the positioning groove 220 to prevent the spring 223 from falling off.

[0034] In addition, a first wave structure 221a can also be provided on the side of the second rubber part 221 near the wrapping cavity 100. Its wave-shaped design facilitates assembly and installation. Chamfers are also provided at the corners of the second rubber part 221, which can also release the stress generated during installation and compression.

[0035] Preferably, a secondary lip 2212 is provided on the second rubber part 221 next to the main lip 2211. The secondary lip 2212 is located between the main lip 2211 and the second sealing lip 212. The secondary lip 2212 is interference-fitted with the shaft 30 to enhance static airtightness.

[0036] In addition, the main lip 2211 and the secondary lip 2212 are provided with a PTFE coating 221b, which can reduce the friction between the main lip 2211 and the secondary lip 2212 and the shaft 30 and improve the sealing effect.

[0037] Oil return lines can also be provided on the first sealing lip 211 and the second sealing lip 212. For example, a first oil return line 2111 is provided on the first sealing lip 211 and a second oil return line 2121 is provided on the second sealing lip 212. By providing oil return lines, the contact area between the first sealing lip 211 and the second sealing lip 212 and the shaft 30 can be reduced, which can effectively reduce wear. It should be noted that the oil return lines should be designed to avoid the bending points of the first sealing lip 211 and the second sealing lip 212 to reduce the risk of breakage.

[0038] Preferably, the inner diameter of the second pad 213 is smaller than the distance between the bending point of the sealing lip (first sealing lip 211 and second sealing lip 212) and the shaft 30. The extension range of the second pad 213 is larger, which can provide better support for the sealing lip.

[0039] 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 hydrogen circulation pump oil-gas seal, characterized in that, include: The outer shell includes a first rubber component and a first skeleton, with a cavity formed between them. One side of the first skeleton is embedded in and abuts against the first rubber component, while the other side protrudes from the first rubber component. A sealing assembly includes a gas-side sealing portion, a first gasket, and an oil-side sealing portion that abut against each other in sequence. The gas-side sealing portion and the oil-side sealing portion abut against the sidewall of the encapsulation cavity on their respective sides away from each other. The gas-side sealing portion includes a sealing lip and a second gasket. The sealing lips abut against the second gasket on their respective sides close to each other, and abut against the inner wall of the encapsulation cavity and the oil-side sealing portion on their respective sides away from each other. The oil-side sealing portion includes a second rubber element and a second skeleton. The second skeleton is embedded in the second rubber element. One side of the second rubber element is embedded in the encapsulation cavity and abuts against the inner wall of the encapsulation cavity, while its other side extends out of the encapsulation cavity and its end forms a main lip.

2. The hydrogen circulation pump oil-gas seal according to claim 1, characterized in that, The first frame includes a first side plate, an extension plate, and a second side plate connected in sequence. The first side plate and the second side plate are perpendicular to the extension plate, respectively. At least a portion of the first side plate is embedded in the first rubber component, and a portion of the extension plate abuts against the first rubber component, while the remaining portion protrudes from the first rubber component.

3. The hydrogen circulation pump oil-gas seal according to claim 2, characterized in that, The extension plate includes a first extension, an oblique extension, and a second extension connected in sequence. The oblique extension abuts against the end of the first rubber part, and the outer wall surface of the second extension is located on the opposite side of the outer wall surface of the first extension.

4. The hydrogen circulation pump oil-gas seal according to claim 1, characterized in that, A positioning groove is provided on the side of the main lip near the encapsulation cavity, and a spring is provided in the positioning groove.

5. The hydrogen circulation pump oil-gas seal according to claim 4, characterized in that, The second rubber component has a blade tail located beside the positioning groove to prevent the spring from falling off.

6. The hydrogen circulation pump oil-gas seal according to claim 1, 4, or 5, characterized in that, The second rubber component has a secondary lip located beside the main lip.

7. The hydrogen circulation pump oil-gas seal according to claim 6, characterized in that, The main lip and / or the secondary lip are provided with a PTFE coating.

8. The hydrogen circulation pump oil-gas seal according to claim 1, characterized in that, The two sealing lips extend in opposite directions on the side away from the encapsulation cavity.

9. The hydrogen circulation pump oil-gas seal according to claim 1, characterized in that, The sealing lip is provided with an oil return line; the sealing lip is made of PTFE material.

10. The hydrogen circulation pump oil-gas seal according to claim 1, characterized in that, The inner diameter of the second pad is smaller than the distance between the bend point of the sealing lip and the shaft.

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