Lower sealing piston friction assembly

Abstract

The utility model relates to the technical field of air compressor piston sealing, and provides a lower sealing piston friction assembly which comprises a piston arranged in a compression space in a sliding mode, after the piston ascends, air entering the compression space is compressed, and a plurality of pin holes are formed in the piston; the plurality of sealing pins are detachably arranged in the pin holes, and the sealing pins are used for sealing the pin holes; the piston is sleeved with the oil sealing ring, an opening is formed in the oil sealing ring, the direction of the opening is the same as that of the axis of the piston, the oil sealing ring is located below the pin hole, the two sides of the oil sealing ring abut against the piston and the side wall of the compression space respectively, and the oil sealing ring is used for preventing lubricating oil from entering the compression space. By means of the technical scheme, the problem that in the working process of an air compressor in the prior art, a small amount of lubricating oil can be discharged along with compressed air, and oil dirt deposition of an exhaust pipeline is caused is solved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to the technical field of air compressor piston sealing, in particular to a lower sealing piston friction assembly. BACKGROUND

[0002] Currently, the mainstream vehicle electric air compressor on 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 in the piston position upwells, is gasified by high temperature generated by compressed air, and is 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 are finally deposited 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. In order to prevent the upwelling of lubricating oil during the compression and exhaust of the piston, solve the problem of air discharge with gas of the vehicle electric air compressor, and achieve the effect of clean exhaust pipeline, a sealing oil friction pair assembly is developed and designed to solve the problem of air discharge with gas of the air compressor under the premise of meeting the performance and durability of the air compressor. CONTENT OF THE UTILITY MODEL

[0003] In order to overcome the above defects, the embodiments of the present disclosure provide a lower sealing piston friction assembly, which solves the technical problem that a small amount of lubricating oil may be discharged with compressed air during the working process of the air compressor in the prior art, resulting in oil stain deposition in the exhaust pipeline.

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

[0005] a piston, which is slidingly arranged in a compression space, the piston compresses air entering the compression space after rising, and the piston has a plurality of pin holes on the upper portion;

[0006] a sealing pin, which has a plurality of pin holes and is detachably arranged in the pin hole, the sealing pin is used for sealing the pin hole;

[0007] an oil sealing ring, which is sleeved on the piston, has an opening on the oil sealing ring, the opening is directed in the same direction as the piston axis, the oil sealing ring is located below the pin hole, the two sides of the oil sealing ring are respectively abutted with the piston and the side wall of the compression space, and the oil sealing ring is used for preventing lubricating oil from entering the compression space.

[0008] For example, in the lower sealing piston friction assembly provided by at least one embodiment of the present disclosure, the sealing pin is columnar, and the lower sealing piston friction assembly further comprises:

[0009] A plurality of flexible sealing pieces are arranged on the sealing pin side wall in intervals, and the flexible sealing pieces are in interference fit with the pin hole.

[0010] For example, the lower sealing piston friction assembly provided by at least one embodiment of the present disclosure further comprises a first mounting groove in the bottom of the piston, and the oil sealing ring is mounted in the first mounting groove.

[0011] For example, the lower sealing piston friction assembly provided by at least one embodiment of the present disclosure further comprises a second mounting groove above the piston side wall.

[0012] An air ring is arranged in the second mounting groove, and the air ring is in abutment with the compression space side wall after being mounted, and the air ring is used for sealing the gas in the compression space.

[0013] For example, the lower sealing piston friction assembly provided by at least one embodiment of the present disclosure further comprises a third mounting groove in the piston side wall, and the third mounting groove is located between the first mounting groove and the second mounting groove.

[0014] A guide ring is arranged in the third mounting groove, and the guide ring is in abutment with the compression space side wall after being mounted, and the guide ring is used for avoiding the piston side wall from directly contacting the inner wall of the compression space.

[0015] For example, the lower sealing piston friction assembly provided by at least one embodiment of the present disclosure further comprises that the opening is downward.

[0016] For example, the lower sealing piston friction assembly provided by at least one embodiment of the present disclosure further comprises that the oil sealing ring comprises:

[0017] A metal elastic sheet with a U-shaped cross section, the metal elastic sheet has elasticity.

[0018] A sealing layer is wrapped on the metal elastic sheet, and the sealing layer is in abutment with the piston and the compression space side wall.

[0019] For example, the lower sealing piston friction assembly provided by at least one embodiment of the present disclosure further comprises that the sealing pin and the guide ring are made of polytetrafluoroethylene.

[0020] For example, the lower sealing piston friction assembly provided by at least one embodiment of the present disclosure further comprises that the guide ring has a cutout.

[0021] The embodiments of the present disclosure have the following beneficial effects:

[0022] In the present disclosure, the piston is lifted in the compression space, when the piston is lifted, the air entering the compression space can be compressed, the oil sealing ring below the pin hole can seal the lubricating oil outside the compression space, and the side wall of the sealing ring can also scrape off the oil film that may adhere in the compression space, so that the lubricating oil does not follow the compressed gas when the air in the compression space is compressed and discharged, and the oil stain in the air compressor pipeline is prevented, and the user experience is improved. The pin hole is located above the oil sealing ring, and the lubricating oil can also be discharged into the compression space through the pin hole, so that the sealing pin is also used to seal the pin hole in the present scheme, so that the lubricating oil above the piston is prevented.

[0023] The advantages of this design are that the pin holes and the sealing pins detachably arranged therein can enhance the structural strength of the piston and effectively seal the pin holes to prevent lubricating oil from leaking from the pin holes. The oil sealing ring greatly improves the sealing performance and effectively prevents lubricating oil from entering the compression space, thereby solving the problem of air oil discharge of the electric air compressor for vehicles. The opening of the oil sealing ring faces the same direction as the piston axis direction, which increases the contact area with the piston and the side wall of the compression space and improves the reliability of the sealing. The oil sealing ring is located below the pin hole and cooperates with the sealing pin to form a multi-layer sealing protection, which further reduces the risk of lubricating oil leakage. The good sealing effect reduces the generation of oil stains, prolongs the service life of the components in the exhaust pipeline, maintains the appearance of the vehicle, and improves customer satisfaction. This lower sealing piston friction assembly solves the long-standing oil discharge problem under the premise of meeting the performance and durability of the air compressor, reduces the maintenance cost and failure rate. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the description of the embodiments of the present disclosure will be briefly introduced. Obviously, the drawings in the following description are only some example embodiments of the present disclosure. Those skilled in the art can obtain other drawings according to the content of the example embodiments of the present disclosure and these drawings without creating any creative labor.

[0025] Figure 1 The structure diagram of the air compressor shell and the piston in an embodiment of the present disclosure is shown in the figure.

[0026] Figure 2 The cross-sectional view of the piston after assembly in the present disclosure is shown in the figure.

[0027] Figure 3 The cross-sectional view of the piston in the present disclosure is shown in the figure.

[0028] Figure 4 The cross-sectional view of the sealing pin in the present disclosure is shown in the figure.

[0029] Figure 5 is a sectional view of an oil seal ring in the present disclosure;

[0030] Figure 6 is a sectional view of an oil seal ring in the present disclosure Figure 5 is a local enlarged view of A in the present disclosure;

[0031] Figure 7 is a sectional view of an air ring in the present disclosure;

[0032] Figure 8 is a sectional view of a guide ring in the present disclosure.

[0033] In the figure: 1, piston, 2, compression space, 3, pin hole, 4, sealing pin, 5, oil seal ring, 6, opening, 7, flexible sealing sheet, 8, first installation groove, 9, second installation groove, 10, air ring, 11, third installation groove, 12, guide ring, 13, metal spring, 14, sealing layer, 15, cutout. DETAILED DESCRIPTION

[0034] The present disclosure will be further described 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, and not to limit the present disclosure.

[0035] In order to make the drawing simple, only the parts related to the disclosure are shown in each figure, and they do not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some figures, only one of the parts with the same structure or function is shown, 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".

[0036] In this paper, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0037] In the present disclosure, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which 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 "over" 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 "under" 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.

[0038] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and other orientation or position relationships shown in the drawings 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.

[0039] 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.

[0040] As shown in Figures 1-8 The present disclosure provides a lower sealing piston friction assembly, which comprises: a piston 1 slidingly arranged in a compression space 2, the piston 1 compresses the air entering the compression space 2 after rising, and the piston 1 has a plurality of pin holes 3; a sealing pin 4 has a plurality of pin holes 3 and is detachably arranged in the pin hole 3, the sealing pin 4 is used for sealing the pin hole 3; an oil sealing ring 5 is sleeved on the piston 1, the oil sealing ring 5 has an opening 6, the opening 6 is in the same direction as the axis direction of the piston 1, the oil sealing ring 5 is located below the pin hole 3, the oil sealing ring 5 is in abutment with the piston 1 and the side wall of the compression space 2 on both sides, and the oil sealing ring 5 is used for preventing lubricating oil from entering the compression space 2.

[0041] In actual application, the piston 1 rises and falls in the compression space 2, the pin hole 3 has a connecting shaft, the connecting shaft connects the connecting rod and the piston 1, and the piston 1 is driven to rise and fall synchronously when the connecting rod rises and falls. When the piston 1 rises, the air in the compression space 2 can be compressed, the oil sealing ring 5 located below the pin hole 3 can seal the lubricating oil outside the compression space 2, and the side wall of the oil sealing ring can also scrape off the oil film that may be adhered in the compression space 2, so that the lubricating oil does not follow the compressed gas to be discharged when the air in the compression space 2 is compressed and discharged, and the deposition of oil stains in the air compressor pipeline is prevented, thereby improving the user experience. The pin hole 3 is located above the oil sealing ring 5, and the lubricating oil can also be discharged from the pin hole 3 into the compression space 2, so that the sealing pin 4 is also used to seal the pin hole 3 in the present scheme, so that the lubricating oil above the piston 1 is prevented.

[0042] The advantages of this design are that the several pin holes 3 and the detachably arranged sealing pins 4 can enhance the structural strength of the piston 1 and effectively seal the pin holes 3, preventing lubricating oil from leaking from the pin holes 3. The arrangement of the oil sealing ring 5 greatly improves the sealing performance and effectively prevents lubricating oil from entering the compression space 2, thereby solving the problem of oil discharge with the air in the electric air compressor for vehicles. The opening 6 of the oil sealing ring 5 faces the same direction as the axis of the piston 1, increasing the contact area with the piston 1 and the side wall of the compression space 2 and improving the reliability of the seal. The oil sealing ring 5 is located below the pin hole 3 and works together with the sealing pin 4 to form a multi-layer sealing protection, further reducing the risk of lubricating oil leakage. Good sealing effect reduces the generation of oil stains, prolongs the service life of components in the exhaust line, maintains the appearance of the vehicle, and improves customer satisfaction. This lower sealing piston 1 friction assembly solves the long-standing problem of oil discharge under the premise of meeting the performance and durability of the air compressor, reducing maintenance costs and failure rates.

[0043] In some examples, the sealing pin 4 is columnar, and further comprises: a plurality of flexible sealing pieces 7 are arranged at intervals on the side wall of the sealing pin 4, and the flexible sealing piece 7 is in interference fit with the pin hole 3.

[0044] In actual application, the flexible sealing piece 7 is arranged at intervals on the side wall of the sealing pin 4, increasing the sealing contact area between the sealing pin 4 and the pin hole 3 and further improving the sealing effect. The flexible sealing piece 7 is in interference fit with the pin hole 3, which can effectively fill the small gap between the sealing pin 4 and the pin hole 3 and prevent lubricating oil from passing through. The flexible sealing piece 7 in interference fit can adapt to the shape change of the pin hole 3 during the movement of the piston 1, maintain good sealing performance, and improve the stability and reliability of the entire sealing structure. This design enhances the sealing ability of the sealing pin 4 and helps to more effectively solve the problem of oil discharge with the air in the electric air compressor for vehicles, ensuring the normal operation of the air compressor and the cleanliness of the exhaust line.

[0045] In some examples, the bottom of the piston 1 has a first mounting groove 8, and the oil sealing ring 5 is mounted in the first mounting groove 8.

[0046] In actual application, the first mounting groove 8 at the bottom of the piston 1 provides a clear and stable mounting position for the oil sealing ring 5, ensuring that the oil sealing ring 5 does not displace during operation and ensuring the stability of the seal. This mounting method enables the oil sealing ring 5 to better combine with the piston 1, enhancing the overall sealing effect and effectively preventing lubricating oil from entering the compression space 2. The mounting groove helps to protect the oil sealing ring 5 from external interference and damage, prolonging the service life of the oil sealing ring 5.

[0047] In some examples, the piston 1 side wall has a second installation groove 9 above it, and further comprising: a gas ring 10 arranged in the second installation groove 9, the gas ring 10 abuts the compression space 2 side wall and the piston 1 side wall after installation, and the gas ring 10 is used to seal the gas in the compression space 2.

[0048] In practical applications, the use of the gas ring 10 effectively seals the gas in the compression space 2, preventing high-pressure gas from affecting the normal operation of the oil seal ring 5 and reducing the risk of seal failure. The second installation groove 9 above the piston 1 side wall provides a dedicated installation position for the gas ring 10, ensuring the stability and accuracy of the installation of the gas ring 10. The gas ring 10 abuts the compression space 2 side wall and the piston 1 side wall, forming a good gas seal, which helps to improve the compression efficiency and quality of the gas in the compression space 2. The sealing effect of the gas in the compression space 2 is enhanced, reducing gas leakage and improving the working performance and energy utilization efficiency of the air compressor. It can effectively prevent the backflow or leakage of compressed gas, ensuring the stability of the pressure and flow of the air compressor output gas, and reducing energy loss and equipment wear caused by gas leakage.

[0049] In some examples, the piston 1 side wall also has a third installation groove 11 between the first installation groove 8 and the second installation groove 9, and further comprising: a guide ring 12 arranged in the third installation groove 11, the guide ring 12 abuts the compression space 2 side wall and the piston 1 side wall after installation, and the guide ring 12 is used to avoid direct contact between the piston 1 side wall and the inner wall of the compression space 2.

[0050] In practical applications, since the oil film on the compression space 2 side wall has been scraped off by the oil seal ring, if the metal piston 1 directly contacts the side wall of the compression space 2, the wear will be very serious, affecting the service life of the piston 1. Therefore, the design of the guide ring 12 is adopted to delay wear. The third installation groove 11 provides a suitable and fixed installation position for the guide ring 12, ensuring that the guide ring 12 does not shift during work and ensuring the stable functioning of its function. The guide ring 12 abuts the compression space 2 side wall and the piston 1 side wall, effectively avoiding direct contact between the piston 1 side wall and the inner wall of the compression space 2, reducing friction and wear between the two. Reducing the resistance when the piston 1 moves makes the movement of the piston 1 more smooth, improving the working efficiency of the air compressor. Reducing the heat and noise generated by direct contact helps to improve the working environment and performance of the air compressor.

[0051] In some examples, the opening 6 faces downward.

[0052] In practical applications, the downward direction of the opening 6 can better cope with the pressure changes generated during the movement of the piston 1, reducing the possibility of lubricating oil leakage. This design enables the oil seal ring 5 to more effectively resist the upward pressure of the lubricating oil during operation, improving the reliability of the seal.

[0053] In some examples, the oil seal ring 5 comprises a metal spring 13 with a U-shaped cross-section and elasticity, and a sealing layer 14 wrapped on the metal spring 13, which is in abutment with the piston 1 and the side wall of the compression space 2.

[0054] In practical applications, the metal spring 13 with a U-shaped cross-section and elasticity can provide good support and elastic recovery force for the oil seal ring 5, so that it can tightly fit the piston 1 and the side wall of the compression space 2 when subjected to pressure, ensuring the sealing effect. The elastic metal spring 13 helps the oil seal ring 5 to adapt to the movement of the piston 1 and the size change of the compression space 2, reducing the sealing failure caused by deformation. The sealing layer 14 wrapped on the metal spring 13 increases the contact area with the piston 1 and the side wall of the compression space 2, improving the reliability and stability of the sealing. The sealing layer 14 is in direct abutment with the piston 1 and the side wall, which can better fill the small gap and further enhance the sealing performance.

[0055] In some examples, the sealing pin 4 and the guide ring 12 are made of polytetrafluoroethylene material.

[0056] In practical applications, polytetrafluoroethylene material has excellent self-lubricating performance, and the use of this material for the sealing pin 4 and the guide ring 12 can reduce friction with the piston 1 and the installation site, reduce wear and tear, and prolong service life. Polytetrafluoroethylene has good corrosion resistance and can maintain stable performance when in contact with lubricating oil and other media, and is not easily corroded or damaged. The low friction coefficient of this material helps to reduce the resistance when the piston 1 moves, improves the working efficiency of the air compressor, and reduces energy consumption. Polytetrafluoroethylene has high heat resistance and can adapt to the high temperature environment generated by the air compressor during operation, ensuring that the performance of the sealing pin 4 and the guide ring 12 is not affected.

[0057] In some examples, the guide ring 12 has a cutout 15 for installing the guide ring 12, and the gas ring 10 is made of wear-resistant material.

[0058] In practical applications, the cutout 15 on the guide ring 12 facilitates the installation of the guide ring 12, making it easier and more convenient to install in the designated position, improving assembly efficiency. The presence of the cutout 15 allows the guide ring 12 to have a certain elastic deformation capacity during installation, which can better adapt to the size of the installation groove, ensuring the firmness and stability of the installation. The gas ring 10 is made of wear-resistant material, which can withstand friction and wear caused by the movement of the piston 1 for a long time, prolonging the service life of the gas ring 10. The wear-resistant gas ring 10 can maintain good sealing performance, reduce gas leakage, and improve the working efficiency and stability of the air compressor. The durable gas ring 10 reduces the frequency of replacement and maintenance, reduces maintenance costs, and improves the reliability and economy of the entire lower sealing piston 1 friction assembly.

[0059] It should be noted that the above examples are only used to illustrate the technical solutions of the present disclosure rather than limit the present disclosure. Although the present disclosure is 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 equivalently replaced without departing from the spirit and scope of the technical solutions of the present disclosure, and all should be covered in the scope of the claims of the present disclosure.

Claims

1. A lower sealing piston friction assembly, characterized in that, include: The piston (1) is slidably disposed in the compression space (2). After the piston (1) rises, it compresses the air entering the compression space (2). The piston (1) has several pin holes (3). A plurality of sealing pins (4) are detachably disposed in the pin holes (3), and the sealing pins (4) are used to seal the pin holes (3). An oil sealing ring (5) is fitted on the piston (1). The oil sealing ring (5) has an opening (6) that faces the same direction as the axis of the piston (1). The oil sealing ring (5) is located below the pin hole (3). The oil sealing ring (5) abuts against the side wall of the compression space (2). The oil sealing ring (5) is used to prevent lubricating oil from entering the compression space (2).

2. The lower sealing piston friction assembly according to claim 1, characterized in that, The sealing pin (4) is cylindrical and also includes: A plurality of flexible sealing sheets (7) are spaced apart on the side wall of the sealing pin (4), and the flexible sealing sheets (7) are interference fit with the pin hole (3).

3. The lower sealing piston friction assembly according to claim 1, characterized in that, The piston (1) has a first mounting groove (8) at its bottom, and the oil sealing ring (5) is installed in the first mounting groove (8).

4. The lower sealing piston friction assembly according to claim 3, characterized in that, The piston (1) has a second mounting groove (9) above its side wall, and also includes: An air ring (10) is disposed in the second mounting groove (9). After installation, the air ring (10) abuts against the side wall of the compression space (2). The air ring (10) is used to seal the gas in the compression space (2).

5. A lower sealing piston friction assembly according to claim 4, characterized in that, The piston (1) sidewall also has a third mounting groove (11), which is located between the first mounting groove (8) and the second mounting groove (9), and further includes: A guide ring (12) is disposed in the third mounting groove (11). After installation, the guide ring (12) abuts against the side wall of the compression space (2). The guide ring (12) is used to prevent the side wall of the piston (1) from directly contacting the inner wall of the compression space (2).

6. The lower sealing piston friction assembly according to claim 1, characterized in that, The opening (6) faces downward.

7. The lower sealing piston friction assembly according to claim 1, characterized in that, The oil sealing ring (5) includes: Metal shrapnel (13) with a U-shaped cross-section; A sealing layer (14) is wrapped around the metal spring sheet (13), and the sealing layer (14) abuts against the side wall of the piston (1) and the compression space (2).

8. A lower sealing piston friction assembly according to claim 5, characterized in that, The sealing pin (4) and the guide ring (12) are made of polytetrafluoroethylene.

9. A lower sealing piston friction assembly according to claim 5, characterized in that, The guide ring (12) has a cut (15).

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