Upper sealing piston friction assembly

Abstract

The utility model relates to the technical field of piston sealing assemblies, and provides an upper sealing piston friction assembly which is characterized in that a piston is arranged in a compression space in a lifting mode, and after the piston ascends, air entering the compression space is compressed; the two sealing rings are arranged on the piston in a sleeving mode, openings are formed in the sealing rings, the directions of the openings are the same as the axis direction of the piston, and the two sides of the sealing rings abut against the piston and the side wall of the compression space respectively. By means of the technical scheme, the technical problems that in the prior art, when a piston ascends, lubricating oil moves upwards, the lubricating oil is discharged along with compressed air after moving upwards, and oil stains are accumulated on a pipeline after a vehicle air compressor is used for a long time are solved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to the technical field of piston sealing assembly, in particular, to an upper sealing piston friction assembly. BACKGROUND

[0002] Currently, the mainstream vehicle air compressor (electric air compressor, gear or belt wheel driven air compressor, etc.) in the market is mostly lubricated by liquid oil. When the piston reciprocates in the cylinder body, due to the gap between the piston skirt and the cylinder body wall, and the gap between the piston ring groove and the piston ring, the lubricating oil on the piston position will upsurge, and the high temperature generated by the compressed air will gasify and be discharged into the exhaust pipeline with the compressed gas. Through the cooling effect of the pipeline, the oil, water and other impurities contained in the gas will eventually deposit and adsorb dust at the exhaust port of the dryer to form oil stains. After a long period of accumulation, the oil stains seriously affect the service life of the components in the exhaust pipeline and the appearance of the vehicle, causing customer complaints. CONTENT OF THE UTILITY MODEL

[0003] To overcome the above-mentioned defects, embodiments of the present disclosure provide an upper sealing piston friction assembly, which solves the technical problem that in the prior art, the lubricating oil will upsurge when the piston rises, and the lubricating oil will be discharged together with the compressed air after upsurging, resulting in that the pipeline of the vehicle air compressor will accumulate oil stains after long-term use.

[0004] According to one aspect, at least one embodiment of the present disclosure provides an upper sealing piston friction assembly, comprising:

[0005] a piston, which is arranged in the compression space in a lifting manner, and is used to compress the air entering the compression space after rising;

[0006] two sealing rings, which are sleeved on the piston, and have openings on the sealing rings, the openings are in the same direction as the axis direction of the piston, and the sealing rings abut against the side wall of the compression space.

[0007] For example, the upper sealing piston friction assembly provided by at least one embodiment of the present disclosure has a first mounting groove on the piston, and the two sealing rings are arranged in the first mounting groove.

[0008] For example, the upper sealing piston friction assembly provided by at least one embodiment of the present disclosure has two sealing rings which abut against each other and have opposite opening directions.

[0009] For example, the upper sealing piston friction assembly provided by at least one embodiment of the present disclosure has a first mounting groove on the piston, and the two sealing rings are arranged in the first mounting groove.

[0010] For example, the upper sealing piston friction assembly provided by at least one embodiment of the present disclosure further has a second mounting groove on the piston side wall, the second mounting groove is below the first mounting groove, the guide ring is located in the second mounting groove, the outer wall of the guide ring abuts against the compression space side wall, and the guide ring is used to avoid direct contact between the piston and the compression space side wall.

[0011] For example, the upper sealing piston friction assembly provided by at least one embodiment of the present disclosure is made of polytetrafluoroethylene.

[0012] For example, the upper sealing piston friction assembly provided by at least one embodiment of the present disclosure is made of polytetrafluoroethylene.

[0013] For example, the upper sealing piston friction assembly provided by at least one embodiment of the present disclosure has a notch on the guide ring.

[0014] The embodiments of the present disclosure have the following beneficial effects:

[0015] In the present disclosure, during use of the vehicle-mounted air compressor, when the piston rises in the compression space, the sealing ring can effectively ensure the sealing effect, prevent the compressed air in the compression space from escaping along the gap between the piston and the compression space side wall, and ensure that the air compressor can work normally. When the air compressor is in use, internal components inevitably need to be lubricated. The double-layer sealing ring and the arrangement mode of the sealing ring significantly increase the contact area between the sealing ring and the compression space side wall and the piston, not only improve the sealing performance, but also ensure that the lubricating oil is effectively blocked below the sealing ring to prevent the lubricating oil from rising. Since the sealing ring is in close contact with the compression space side wall, when the piston descends, the oil film adhering to the compression space side wall can be scraped off together, further reducing the oil gas in the compressed air.

[0016] The advantage of this design is that the two sealing rings sleeved on the piston greatly enhance the sealing effect and effectively reduce the possibility of lubricating oil rising. The opening direction is the same as the piston axis direction, and this structure design increases the contact area of the sealing ring with the piston and the compression space side wall, improves the sealing performance, and forms a good sealing interface between the two sides of the sealing ring and the piston and the compression space side wall, thereby preventing the lubricating oil from passing through, solving the problem of air oil discharge of the vehicle-mounted air compressor, prolonging the service life of the components in the exhaust pipeline, maintaining the appearance of the whole vehicle, and improving customer satisfaction. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments of the present disclosure will be briefly introduced. Obviously, the drawings in the following description only represent some of the example embodiments of the present disclosure. For those skilled in the art, other drawings can be obtained according to the contents of the example embodiments of the present disclosure and these drawings without any creative effort.

[0018] Figure 1 Structure schematic diagram of air compressor in one embodiment of the present disclosure;

[0019] Figure 2 Sectional view of assembled piston in one embodiment of the present disclosure;

[0020] Figure 3 Sectional view of piston in one embodiment of the present disclosure;

[0021] Figure 4 Sectional view of sealing ring in one embodiment of the present disclosure;

[0022] Figure 5 Sectional view of sealing ring in one embodiment of the present disclosure; Figure 4

[0023] Figure 6 Front view of guide ring in one embodiment of the present disclosure.

[0024] In the figure: 2, compression space, 3, piston, 4, sealing ring, 5, opening, 6, first mounting groove, 7, second mounting groove, 8, guide ring, 410, skeleton, 420, cladding, 9, cutout. DETAILED DESCRIPTION

[0025] The present disclosure will be further described in detail below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present disclosure, but not to limit the present disclosure.

[0026] In order to make the drawing simple and convenient to understand, only the parts related to the disclosure are schematically represented in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and convenient to understand, in some drawings, only one of the components with the same structure or function is schematically represented, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0027] ​In this document, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0028] In the present disclosure, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0029] In the description of the present embodiment, the terms "up", "down", "left", "right" and other orientation or position relationships are based on the orientation or position relationships shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0030] In addition, in the description of the present application, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0031] As Figures 1-6 As shown in the figure, it shows a kind of upper sealing piston friction assembly for sealing of vehicle air compressor piston 3 in an embodiment of the present disclosure, comprising: piston 3 is arranged in lifting in compression space 2, piston 3 is lifted, for the air compressed into compression space 2;Sealing ring 4 has two, is sleeved on piston 3, sealing ring 4 has opening 5, opening 5 is towards the same direction as the axis direction of piston 3, the two sides of sealing ring 4 respectively abut with piston 3 and the side wall of compression space 2.

[0032] In practical applications, for example, in the use of the air compressor in the vehicle, when the piston 3 rises in the compression space 2, the sealing ring 4 can effectively ensure the sealing effect, prevent the compressed air in the compression space 2 from leaving along the gap between the piston 3 and the side wall of the compression space 2, and ensure that the air compressor can work normally. When the air compressor is in use, it is inevitable to lubricate the internal components. The double-layer sealing ring 4 and the arrangement of the sealing ring 4 significantly increase the contact area between the sealing ring 4 and the side wall of the compression space 2 and the piston 3, not only improve the sealing performance, but also can effectively prevent the lubricating oil from rising. Since the sealing ring 4 is in close contact with the side wall of the compression space 2, when the piston 3 descends, the oil film adhering to the side wall of the compression space 2 can be scraped off together, further reducing the oil gas in the compressed air.

[0033] The advantage of this design is that the two sealing rings 4 sleeved on the piston 3 greatly enhance the sealing effect and effectively reduce the possibility of lubricating oil rising. The opening 5 is directed in the same direction as the axis of the piston 3, which increases the contact area between the sealing ring 4 and the piston 3 and the side wall of the compression space 2, and improves the sealing performance. The sealing ring 4 is in abutment with the piston 3 and the side wall of the compression space 2 on both sides, forming a good sealing interface to prevent lubricating oil from passing through, thereby solving the problem of air compressor oil discharge in the vehicle, prolonging the service life of the components in the exhaust line, maintaining the appearance of the vehicle, and improving customer satisfaction.

[0034] In some examples, the piston 3 has a first mounting groove 6, and the two sealing rings 4 are arranged in the first mounting groove 6.

[0035] In practical applications, when the piston 3 rises and falls, since the sealing ring 4 is sleeved on the piston 3 and closely adheres to the side wall of the compression space 2, although the friction coefficient of the surface of the piston 3 is greater than that of the side wall of the compression space 2, the sealing ring 4 may still be separated from the piston 3 when the piston 3 rises and falls, resulting in that the air compressor cannot work normally. Therefore, the first mounting groove 6 is provided on the sealing ring 4 to ensure that the sealing ring 4 is always sleeved on the piston 3 and cannot be separated from the piston 3. When installing the sealing ring 4, the sealing ring 4 is first heated and expanded as a whole so that it can be sleeved on the piston 3. When the temperature of the sealing ring 4 decreases, it will return to normal size and be firmly sleeved on the piston 3.

[0036] The advantage of this design is that the first mounting groove 6 on the piston 3 provides a clear mounting position for the sealing ring 4, ensuring that the sealing ring 4 is stable in position during operation and is not easily offset. This mounting method allows the sealing ring 4 to better cooperate with the piston 3, enhancing the overall sealing stability. The first mounting groove 6 helps to protect the sealing ring 4, reducing the possibility of external interference and damage, prolonging the service life of the sealing ring 4. The clear mounting position facilitates the installation and replacement of the sealing ring 4, improving the convenience and efficiency of maintenance. The design of the mounting groove allows the sealing ring 4 to form an integral part with the piston 3, enabling more effective sealing during the movement of the piston 3, further reducing the risk of lubricating oil rising.

[0037] In some examples, the two sealing rings 4 abut each other and the openings 5 are in opposite directions.

[0038] In actual application, the two U-shaped sealing rings 4 are arranged back-to-back with the openings 5 facing opposite directions. The opening 5 of the upper sealing ring 4 faces upwards, while the opening 5 of the lower sealing ring 4 faces downwards. The lower sealing ring 4 can effectively prevent lubricating oil from entering, and can also scrape off the oil film adhering to the surface of the compression space 2 during the descent of the piston 3. The upper sealing ring 4 can further scrape off the adhering oil film. Even if the lower sealing ring 4 fails, it can still ensure normal operation for a certain period of time, improving the service life of the equipment.

[0039] The advantage of this design is that the two sealing rings 4 abut each other, with the upper sealing ring 4 used for sealing air to ensure the normal operation of the compressor, and the lower sealing ring 4 used for sealing oil to prevent oil from entering the compression space and causing oil mist. The opening of the upper sealing ring faces upwards, and when the pressure in the compression space 2 increases, the pressure in the opening also increases, causing the sealing ring to adhere more tightly to the inner wall of the compression space 2, further improving the sealing performance. The two sealing rings 4 increase the number of sealing layers and the contact area, further improving the reliability of the seal and effectively preventing the upward movement of lubricating oil. The design of the openings 5 in opposite directions allows the two sealing rings 4 to support and complement each other during operation, enhancing the overall sealing performance. This abutting structure with openings 5 in opposite directions can better adapt to the movement of the piston 3, reducing the change in sealing gap caused by the movement of the piston 3, and maintaining stable sealing effect. The opposite openings 5 design can also share the sealing pressure, reducing the load on individual sealing rings 4 and prolonging the service life of the sealing rings 4. This helps to improve the sealing stability and durability of the piston 3 friction assembly, better solving the problem of air discharge of the air compressor for vehicles, ensuring the normal operation of the air compressor and the cleanliness of the exhaust pipeline.

[0040] In some examples, the first mounting groove 6 is located at the top of the piston 3.

[0041] In practical applications, the size of the first installation groove 6 is equivalent to the thickness of the two sealing rings 4, and the sealing ring 4 is limited after being installed into the first installation groove 6 at the top, and cannot slide relatively along the piston 3. The sealing ring 4 at the top of the piston 3 can play a sealing effect first, thereby ensuring the sealing performance.

[0042] The advantage of this design is that the first installation groove 6 is located at the top of the piston 3, so that the sealing ring 4 can play a sealing role first when the piston 3 rises to compress air, effectively preventing the lubricating oil from rising at the initial stage of compression. This position layout is beneficial to fully utilize the movement direction and pressure distribution of the piston 3, and improve the sealing effect of the sealing ring 4.

[0043] In some examples, the piston 3 also has a second installation groove 7 on the side wall, and the second installation groove 7 is located below the first installation groove 6. A guide ring 8 is located in the second installation groove 7, and the outer wall of the guide ring 8 abuts against the side wall of the compression space 2. The guide ring 8 is used to avoid direct contact between the piston 3 and the inner wall of the compression space 2.

[0044] In practical applications, the piston 3 is usually a metal structure, and the air compressor is also a metal structure. When the piston 3 descends, the sealing ring 4 has already removed the oil film of the compression space 2. At this time, if the piston 3 directly contacts the air compressor shell, a large amount of wear will be generated, thereby reducing the service life of the air compressor. The setting of the guide ring 8 can avoid direct contact between the piston 3 and the air compressor shell, and can also fill the gap between the piston 3 and the shell, thereby ensuring the stability of the lifting of the piston 3.

[0045] The advantage of this design is that the guide ring 8 in the second installation groove 7 can effectively avoid direct contact between the piston 3 and the inner wall of the compression space, reduce the wear between the piston 3 and the shell, and prolong the service life of the piston 3 and the air compressor. The abutment of the guide ring 8 against the side wall of the compression space 2 provides a guide function for the lifting movement of the piston 3, thereby ensuring the stability and accuracy of the movement of the piston 3, improving the efficiency and quality of the compressed air. Since direct friction between the piston 3 and the inner wall of the shell is avoided, the heat and noise generated by friction are reduced, which helps to improve the working performance and stability of the air compressor. The setting of the guide ring 8 can share the sealing pressure of the sealing ring 4 to some extent, so that the sealing ring 4 can focus more on preventing the lubricating oil from rising, thereby further optimizing the sealing effect.

[0046] In some examples, the guide ring 8 is made of polytetrafluoroethylene material; and the main skeleton 410 of the sealing ring 4 is a spring steel with a U-shaped cross-sectional area, and the skeleton 410 has a polytetrafluoroethylene material coating layer 420 outside.

[0047] In practical applications, the guide ring 8 is made of polytetrafluoroethylene, which has good self-lubricating property and wear resistance, can reduce friction between the guide ring 8 and the inner wall of the shell, prolong the service life of the guide ring 8 itself, and reduce the movement resistance and energy consumption. The main framework of the sealing ring 4 is made of spring steel with a U-shaped cross section, which provides good elasticity and support force, ensuring that the sealing ring 4 can tightly fit the piston 3 and the side wall of the compression space 2 during operation, maintaining stable sealing performance.

[0048] The advantage of this design is that the outer layer of the sealing ring 4 is coated with polytetrafluoroethylene, which takes advantage of the corrosion resistance, low friction coefficient, and good sealing performance of polytetrafluoroethylene to further improve the sealing effect and durability of the sealing ring 4. This combination of materials allows the guide ring 8 and the sealing ring 4 to meet functional requirements while having a longer service life and stable performance, reducing maintenance costs and replacement frequency. The polytetrafluoroethylene material has good high-temperature resistance and can adapt to the high-temperature environment generated by the air compressor during operation, ensuring the normal operation of the guide ring 8 and the sealing ring 4, and improving the reliability and stability of the entire piston 3 friction assembly.

[0049] In some examples, the guide ring 8 has a cutout 9.

[0050] In practical applications, since the guide ring 8 has a larger outer shape than the sealing ring 4, the installation difficulty is relatively greater than that of the sealing ring 4. When installing, a notch is cut on the guide ring 8 to reduce the installation difficulty of the guide ring 8.

[0051] The advantage of this design is that the cutout 9 on the guide ring 8 allows it to be more easily installed into the second installation groove 7 of the piston 3, improving installation efficiency. The presence of the cutout 9 allows the guide ring 8 to have a certain elastic deformation capability during installation, better adapting to the size and shape of the installation groove, ensuring the firmness and stability of the installation. This design reduces the requirement for installation precision, is easy to operate, and reduces damage to the guide ring 8 and the piston 3 during installation.

[0052] It should be noted that the above examples are only used to illustrate the technical solutions of the present disclosure and are not limiting. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present disclosure can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present disclosure, which should be covered by the claims of the present disclosure.

Claims

1. An upper seal piston friction assembly for sealing of a piston of an air compressor for a vehicle, characterized in that, Comprising: a piston (3) is arranged in the compression space (2) in a lifting manner, the piston (3) is used to compress the air entering the compression space (2) after being lifted; two sealing rings (4) are sleeved on the piston (3), the sealing ring (4) has an opening (5) on it, the opening (5) is directed to the same direction as the axis direction of the piston (3), and the sealing ring (4) is in abutment with the side wall of the compression space (2).

2. A top seal piston friction assembly as claimed in claim 1, wherein, The piston (3) has a first mounting groove (6) on it, and the two sealing rings (4) are arranged in the first mounting groove (6).

3. A top seal piston friction assembly as described in claim 1 wherein, The two sealing rings (4) are in abutment with each other and the directions of the openings (5) are opposite.

4. A top seal piston friction assembly as described in claim 2 wherein, The first mounting groove (6) is located at the top of the piston (3).

5. A top seal piston friction assembly as described in claim 2 wherein, The piston (3) further has a second mounting groove (7) on the side wall, and the second mounting groove (7) is located below the first mounting groove (6), and further comprising: a guide ring (8) is located in the second mounting groove (7), the outer wall of the guide ring (8) is in abutment with the side wall of the compression space (2), and the guide ring (8) is used to avoid the piston (3) directly contacting the side wall of the compression space (2).

6. A top seal piston friction assembly as claimed in claim 5, wherein, The guide ring (8) is made of polytetrafluoroethylene.

7. A top seal piston friction assembly as described in claim 5 wherein, The sealing ring (4) comprises: a skeleton (410) with a U-shaped cross section; a cladding layer (420) arranged on the outside of the skeleton (410), the cladding layer (420) is in abutment with the piston (3) and the side wall of the compression space (2).

8. A top seal piston friction assembly as claimed in claim 7, wherein, The skeleton (410) is made of spring steel.

9. A top seal piston friction assembly as described in claim 7, wherein, The cladding layer (420) is made of polytetrafluoroethylene.

10. A top seal piston friction assembly as described in claim 5, wherein, The guide ring (8) has a cutout (9).

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