Radial double-end-face oil gas end face sealing structure for turbocharger

Abstract

The utility model discloses a radial double-end-face oil gas end face sealing structure for a turbocharger, relates to the technical field of turbocharger sealing structures, and solves the problems that in the prior art, after a sealing ring between a gas cavity and an oil gas cavity is subjected to long-time friction of a gas side static ring, the sealing performance is reduced, and the sealing performance is poor. The oil slinger and the impeller are installed on the surface of the rotating shaft, the shell is installed on one side of the impeller, a movable ring piece is installed on the portion, located on one side of the oil slinger, of the surface of the rotating shaft, and a static ring is installed on one side of the movable ring piece; the end face of one side of the static ring makes contact with the surface of the movable ring piece, and a plurality of first springs are installed between the static ring and the shell. According to the utility model, the sealing assembly is arranged between the static ring and the sealing ring to seal the joint between the static ring and the sealing ring, so that the condition of leakage at the wear part between the static ring and the sealing ring is not easy to occur.

Description

Technical Field

[0001] The utility model relates to the field of turbocharger sealing structures, in particular to a radial double-end oil-gas end face sealing structure for a turbocharger. Background Art

[0002] Turbocharging technology is an effective way to improve the efficiency of vehicle engines and save energy and reduce consumption. It uses high-temperature exhaust gas to drive a turbine, which drives a coaxial compressor impeller to rotate at high speed to send compressed air with higher pressure and density into the engine cylinder, thereby achieving the purpose of increasing the engine output power. Among them, the seal is one of the important key basic components in the turbocharging system. It is arranged between the compressor, the turbine and the bearing chamber, mainly used to prevent the air on the back of the compressor or the high-temperature gas at the turbine end from entering the bearing chamber and polluting the engine oil. At the same time, it also prevents the engine oil from entering the compressor end or the turbine end, resulting in the phenomenon of "burning engine oil" or a large amount of oil leakage. The quality of its sealing performance directly affects the working performance, service life and economy of the entire turbocharging system.

[0003] A radial double-end oil-gas end face sealing structure for a turbocharger disclosed in a Chinese invention (publication number: CN115788947A) includes a moving ring assembly, a stationary ring assembly, a fixed housing and a rotating shaft. The moving ring assembly and the oil slinger rotate with the rotating shaft. The stationary ring assembly is located between the fixed housing and the moving ring assembly. The stationary ring assembly includes a gas-side stationary ring and an oil-gas-side stationary ring. A gas chamber is formed between the gas-side stationary ring, the impeller, the fixed housing and the moving ring assembly. A variable pressure chamber is formed between the gas-side stationary ring, the oil-gas-side stationary ring and the moving ring assembly. An oil-gas chamber is formed between the oil-gas-side stationary ring, the oil slinger, the fixed housing and the moving ring assembly. Compression springs are provided between the fixed housing and the gas-side stationary ring and between the gas-side stationary ring and the oil-gas-side stationary ring. Dynamic pressure grooves are evenly distributed in the circumferential direction on the end face of the outer diameter of the gas-side stationary ring and the end face of the inner diameter of the oil-gas-side stationary ring. It can have both low oil leakage characteristics during low-speed operation and low gas leakage characteristics during high-speed operation under the condition of limited axial dimension of the turbocharger.

[0004] In the process of implementing the present utility model, the inventor found that at least the following problems exist in this technology. A first auxiliary seal ring is provided between the gas-side stationary ring and the fixed housing to block the leakage channel between them. However, since the gas-side stationary ring will move under the action of the first compression spring, when the first auxiliary seal ring undergoes long-term friction, the sealing performance decreases, and gas leakage occurs between the gas chamber and the oil-gas chamber. Therefore, a radial double-end oil-gas end face sealing structure for a turbocharger is now proposed. Summary of the Utility Model

[0005] In order to solve the problem that the sealing ring between the gas chamber and the oil-gas chamber in the prior art has reduced sealing performance after long-term friction on the static ring side of the gas, resulting in gas leakage between the gas chamber and the oil-gas chamber, the present utility model provides a radial double-end oil-gas end face sealing structure for a turbocharger.

[0006] The present utility model provides a radial double-end oil-gas end face sealing structure for a turbocharger, adopting the following technical scheme:

[0007] A radial double-end oil-gas end face sealing structure for a turbocharger includes a rotating shaft, an oil slinger and an impeller installed on the surface of the rotating shaft, and a housing installed on one side of the impeller. A moving ring member is installed on the surface of the rotating shaft on one side of the oil slinger. A static ring is installed on one side of the moving ring member. One end face of the static ring is in contact with the surface of the moving ring member. A plurality of first springs are installed between the static ring and the housing. A gas chamber is formed among the static ring, the impeller, the moving ring member and the housing. An oil-gas chamber is formed among the static ring, the moving ring member, the housing and the oil slinger. A sealing ring is installed between the static ring and the housing. The cross-section of the sealing ring is U-shaped. A sealing assembly is installed between the static ring and the sealing ring.

[0008] By adopting the above technical scheme, by installing a sealing assembly between the static ring and the sealing ring to seal the connection between the static ring and the sealing ring, it is not easy for leakage to occur at the worn part between the static ring and the sealing ring.

[0009] Optionally, the sealing assembly includes a flexible sealing ring gasket fixedly installed on the circumferential surface of the static ring and a second spring installed between the flexible sealing ring gasket and the side end face of the static ring. The flexible sealing ring gasket is in close contact with the inner side wall of the sealing ring.

[0010] By adopting the above technical scheme, under the action of the second spring, the flexible sealing ring gasket is in close contact with the inner side wall of the sealing ring, so that it is not easy for the oil and gas inside the oil-gas chamber to leak from the connection between the static ring and the sealing ring to the inside of the gas chamber.

[0011] Optionally, a connecting ring is fixedly installed on one side of the flexible sealing ring gasket. An annular groove is formed on the side end face of the static ring. The connecting ring is inserted into the annular groove. The second spring is installed in the annular groove.

[0012] By adopting the above technical scheme, by installing the second spring inside the annular groove, the installation is stable. And there is a connecting ring between the second spring and the flexible sealing ring gasket, so that the second spring does not contact the flexible sealing ring gasket, which is beneficial to improving the service life of the flexible sealing ring gasket.

[0013] Optionally, a telescopic rod is fixedly installed between the housing and the static ring. The telescopic rod passes through the inside of the first spring.

[0014] By adopting the above technical solution, the telescopic rod is arranged to improve the installation effect of the first spring, and it is not easy to bend.

[0015] Optionally, the contact surface between the stationary ring and the moving ring member is designed with a stepped structure.

[0016] By adopting the above technical solution, the setting of this structure increases the contact area between the stationary ring and the moving ring member, thereby improving the sealing effect.

[0017] Optionally, an oil storage groove is formed on the contact surface between the moving ring member and the stationary ring.

[0018] By adopting the above technical solution, by adding lubricating oil into the oil storage groove, the friction between the contact surfaces of the stationary ring and the moving ring member is reduced, wear is decreased, and at the same time, an oil sealing surface is formed to improve the sealing effect.

[0019] In summary, the utility model has the following beneficial effects:

[0020] 1. When the moving ring member rotates with the rotating shaft in the utility model, under the action of the first spring, the stationary ring makes the contact between the stationary ring and the moving ring member close, realizing the sealing between the gas chamber and the oil and gas chamber. Moreover, the contact surface between the stationary ring and the moving ring member is designed with a stepped structure, which increases the contact area between the stationary ring and the moving ring member, thereby improving the sealing effect. At the same time, by adding lubricating oil into the oil storage groove, the friction between the contact surfaces of the stationary ring and the moving ring member is reduced, wear is decreased, and at the same time, an oil sealing surface is formed to improve the sealing effect;

[0021] 2. In the utility model, by installing a sealing component between the stationary ring and the sealing ring, under the action of the second spring, the flexible sealing ring gasket is closely attached to the inner side wall of the sealing ring, so that it is not easy for the oil and gas inside the oil and gas chamber to leak from the connection between the stationary ring and the sealing ring into the gas chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the schematic main cross-sectional structure view of the utility model.

[0023] Figure 2 is the utility model Figure 1 The enlarged structure view at A.

[0024] Figure 3 is the schematic side view structure of the flexible sealing ring gasket of the utility model.

[0025] Description of the reference numerals:

[0026] 1. Rotating shaft; 2. Oil slinger; 3. Impeller; 4. Housing; 5. Moving ring part; 6. Stationary ring; 7. First spring; 8. Gas chamber; 9. Oil and gas chamber; 10. Sealing ring; 11. Flexible sealing ring gasket; 12. Second spring; 13. Connecting ring; 14. Annular groove; 15. Telescopic rod; 16. Oil storage groove. Detailed implementation mode

[0027] The following will further elaborate on this application in conjunction with the attached Figures 1-3 drawings.

[0028] Please refer to Figures 1-3 , a radial double - end face oil - gas end face sealing structure for a turbocharger, including a rotating shaft 1, an oil slinger 2 and an impeller 3 installed on the surface of the rotating shaft 1, and a housing 4 installed on one side of the impeller 3. A moving ring part 5 is installed on the surface of the rotating shaft 1 on one side of the oil slinger 2. A stationary ring 6 is installed on one side of the moving ring part 5. The end face on one side of the stationary ring 6 contacts the surface of the moving ring part 5. Several first springs 7 are installed between the stationary ring 6 and the housing 4. A telescopic rod 15 is fixedly installed between the housing 4 and the stationary ring 6. The telescopic rod 15 penetrates through the inside of the first spring 7. The setting of the telescopic rod 15 improves the installation effect of the first spring 7 and is not prone to bending.

[0029] Refer to Figures 1-2 , a gas chamber 8 is formed among the stationary ring 6, the impeller 3, the moving ring part 5 and the housing 4, and an oil - gas chamber 9 is formed among the stationary ring 6, the moving ring part 5, the housing 4 and the oil slinger 2. When the moving ring part 5 rotates with the rotating shaft 1, under the action of the first springs 7, the stationary ring 6 makes close contact with the moving ring part 5, realizing the seal between the gas chamber 8 and the oil - gas chamber 9. The contact surface between the stationary ring 6 and the moving ring part 5 is designed as a stepped structure. This structure setting increases the contact area between the stationary ring 6 and the moving ring part 5, thereby improving the sealing effect. An oil storage groove 16 is opened on the contact surface between the moving ring part 5 and the stationary ring 6. By adding lubricating oil into the oil storage groove 16, the friction force of the contact surface between the stationary ring 6 and the moving ring part 5 is reduced, wear is decreased, and at the same time, an oil seal surface is formed to improve the sealing effect.

[0030] Refer to Figures 1-2 , a sealing ring 10 is installed between the stationary ring 6 and the housing 4. The sealing ring 10 is fixedly installed on the housing 4, and the stationary ring 6 can move horizontally inside the sealing ring 10. The cross - section of the sealing ring 10 is U - shaped, and a sealing component is installed between the stationary ring 6 and the sealing ring 10. By installing a sealing component between the stationary ring 6 and the sealing ring 10, the connection between the stationary ring 6 and the sealing ring 10 is sealed, so that it is not easy for leakage to occur at the wear part between the stationary ring 6 and the sealing ring 10.

[0031] Refer to Figures 1-3, the sealing assembly includes a flexible sealing ring gasket 11 fixedly installed on the circumferential side surface of the stationary ring 6 and a second spring 12 installed between the flexible sealing ring gasket 11 and the side end face of the stationary ring 6. The flexible sealing ring gasket 11 is in close fit with the inner side wall of the sealing ring 10. Under the action of the second spring 12, the flexible sealing ring gasket 11 is in close fit with the inner side wall of the sealing ring 10, so that it is not easy for the oil and gas inside the oil and gas chamber 9 to leak from the connection between the stationary ring 6 and the sealing ring 10 to the inside of the gas chamber 8.

[0032] Refer to Figures 1-3 , a connecting ring 13 is fixedly installed on one side of the flexible sealing ring gasket 11. An annular groove 14 is formed on the side end face of the stationary ring 6. The connecting ring 13 is inserted into the annular groove 14. The second spring 12 is installed inside the annular groove 14. By installing the second spring 12 inside the annular groove 14, the installation is stable. And there is a connecting ring 13 between the second spring 12 and the flexible sealing ring gasket 11, so that the second spring 12 does not contact the flexible sealing ring gasket 11, which is beneficial to improving the service life of the flexible sealing ring gasket 11.

[0033] The implementation principle of the present invention is as follows: during operation, when the moving ring member 5 rotates with the rotating shaft 1, under the action of the first spring 7, the stationary ring 6 is in close contact with the moving ring member 5, realizing the sealing between the gas chamber 8 and the oil and gas chamber 9. Moreover, the contact surface between the stationary ring 6 and the moving ring member 5 is designed with a stepped structure, which increases the contact area between the stationary ring 6 and the moving ring member 5, thereby improving the sealing effect. At the same time, by adding lubricating oil into the oil storage groove 16, the friction force between the contact surfaces of the stationary ring 6 and the moving ring member 5 is reduced, wear is reduced, and at the same time, an oil sealing surface is formed to improve the sealing effect;

[0034] By installing a sealing assembly between the stationary ring 6 and the sealing ring 10, under the action of the second spring 12, the flexible sealing ring gasket 11 is in close fit with the inner side wall of the sealing ring 10, so that it is not easy for the oil and gas inside the oil and gas chamber 9 to leak from the connection between the stationary ring 6 and the sealing ring 10 to the inside of the gas chamber 8.

[0035] The above are all the preferred embodiments of the present invention. The protection scope of the present invention is not limited hereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A radial double-end oil-gas end face seal structure for a turbocharger, comprising a rotating shaft (1), an oil slinger (2) and an impeller (3) mounted on the surface of the rotating shaft (1), and a housing (4) mounted on one side of the impeller (3), characterized in that: A moving ring (5) is installed on the surface of the rotating shaft (1) at one side of the oil slinger (2); a stationary ring (6) is installed on one side of the moving ring (5); an end face of one side of the stationary ring (6) contacts the surface of the moving ring (5); a plurality of first springs (7) are installed between the stationary ring (6) and the housing (4); a gas chamber (8) is formed between the stationary ring (6), the impeller (3), the moving ring (5) and the housing (4); an oil-gas chamber (9) is formed between the stationary ring (6), the moving ring (5), the housing (4) and the oil slinger (2); a sealing ring (10) is installed between the stationary ring (6) and the housing (4); the cross section of the sealing ring (10) is U-shaped; a sealing assembly is installed between the stationary ring (6) and the sealing ring (10).

2. A radial double-end oil and gas end face seal structure for a turbocharger according to claim 1, characterized in that: The sealing assembly comprises a flexible sealing ring gasket (11) fixedly mounted on the circumferential surface of the stationary ring (6) and a second spring (12) mounted between the flexible sealing ring gasket (11) and the side end surface of the stationary ring (6); the flexible sealing ring gasket (11) is tightly fitted to the inner side wall of the sealing ring (10).

3. A radial double-end oil and gas end face seal structure for a turbocharger according to claim 2, characterized in that: A connecting ring (13) is fixedly mounted on one side of the flexible sealing ring gasket (11); an annular groove (14) is formed on the side end surface of the stationary ring (6); the connecting ring (13) is inserted into the inside of the annular groove (14); and the second spring (12) is mounted inside the annular groove (14).

4. A radial double-end oil and gas end face seal structure for a turbocharger according to claim 1, characterized in that: A telescopic rod (15) is fixedly mounted between the housing (4) and the stationary ring (6), and the telescopic rod (15) passes through the interior of the first spring (7).

5. The radial double-end oil and gas end face seal structure for a turbocharger according to claim 1, characterized in that: The contact surface between the stationary ring (6) and the dynamic ring (5) is designed as a stepped structure.

6. A radial double-end oil and gas end face seal structure for a turbocharger according to claim 1, characterized in that: An oil storage groove (16) is provided on the contact surface between the moving ring (5) and the stationary ring (6).

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