Oil throwing structure at near-pressure end of supercharger

Abstract

The utility model discloses an oil slinging structure at the near pressure end of a supercharger, which comprises a turbine shaft (1), the near pressure end of the turbine shaft (1) is sleeved with a shaft sealing sleeve (2) and a floating bearing (3), the shaft sealing sleeve (2) and the floating bearing (3) are arranged along the axial direction of the turbine shaft (1), the outer layer of the shaft sealing sleeve (2) is sleeved with an air sealing plate (4), the outer layer of the floating bearing (3) is sleeved with a middle body (5), and the middle body (5) is sleeved with a sealing ring (6). An oil throwing cavity (6) is formed in the connecting position of the air sealing plate (4) and the middle body (5), and the lower end of the oil throwing cavity (6) is connected with an oil return pipeline (7). The utility model provides an oil throwing structure at a near-pressure end of a supercharger, which can reduce oil leakage and reduce engine oil supply frequency by reducing the design of an oil baffle plate.

Description

Technical Field

[0001] This utility model relates to the field of turbochargers, specifically to an oil-slinging structure near the pressure end of a turbocharger. Background Technology

[0002] During the operation of a turbocharger, a closed-loop oil supply method is often used to ensure that a small amount of oil is sufficient for long-term lubrication, reducing friction and wear. However, due to the clearance at the pressure end of the turbocharger, the oil level can easily decrease during the closed-loop circulation process, thus requiring regular oil replenishment.

[0003] To reduce oil leakage and thus the frequency of regular oil replenishment, traditional turbochargers have an oil baffle plate near the pressure end. However, this method makes the turbocharger more complex and heavier, and increases the production cost of the turbocharger. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide an oil-throwing structure at the near-pressure end of a turbocharger that reduces the design of the oil baffle plate but still ensures reduced oil leakage and reduced oil replenishment frequency.

[0005] The technical solution adopted by this utility model to solve the above problems is an oil slinging structure for the near-pressure end of a turbocharger, including a turbine shaft. A shaft seal sleeve and a floating bearing are sleeved on the near-pressure end of the turbine shaft. The shaft seal sleeve and the floating bearing are arranged along the axial direction of the turbine shaft. An air seal plate is sleeved on the outer layer of the shaft seal sleeve. An intermediate body is sleeved on the outer layer of the floating bearing. An oil slinging chamber is provided at the connection between the air seal plate and the intermediate body. The lower end of the oil slinging chamber is connected to a return oil pipe.

[0006] Compared with the prior art, the advantages of this utility model are as follows: Through the design of the oil slinger chamber, the engine oil is directly collected into the oil slinger chamber during the rapid rotation of the turbine shaft. Then, the oil collected in the oil slinger chamber is recirculated back into the closed-loop oil circulation system through the oil return pipe, thereby avoiding the accumulation of oil in the oil slinger chamber and affecting the smoothness of oil being thrown out of the oil slinger chamber, ensuring the long-term oil collection effect of the oil slinger chamber. At the same time, this process reduces the design of the oil baffle plate, simplifies the structural complexity, reduces production costs, and reduces the oil pressure near the pressure end by timely oil drainage, thereby reducing the risk of oil leakage and reducing the frequency of oil replenishment.

[0007] As an improvement of this utility model, the oil slinger chamber is located on the side of the air seal plate near the middle body. The oil slinger chamber is machined along the contour of the air seal plate. Through this improvement, under the condition of ensuring the strength of the air seal plate, the larger the oil slinger chamber, the larger the space for oil accumulation in the oil slinger chamber, and the less likely the oil will accumulate and form high pressure, which can reduce the probability of oil leakage. At the same time, the larger the oil slinger chamber, the lower the mass of the air seal plate, which helps to control the weight of the turbocharger and reduce the cost of the turbocharger.

[0008] As an improvement of this utility model, an oil-throwing channel is provided on the side of the intermediate body near the air seal plate. The oil-throwing channel is connected to the oil-throwing chamber. Through this improvement, since the oil-throwing chamber is formed based on the structure of the air seal plate, the connection relationship of the air seal plate cannot be destroyed due to the design of the oil-throwing chamber. Therefore, there will be a gap between the oil-throwing chamber and the turbine shaft, which requires the design of the oil-throwing channel so that the turbine shaft can smoothly throw the oil into the oil-throwing chamber when throwing oil.

[0009] As an improvement of this utility model, the oil slinger channel includes an oil slinger regulating chamber, which includes an regulating chamber inlet and an regulating chamber outlet. The distance between the regulating chamber inlet and the turbine shaft is less than the distance between the turbine shaft and the connection point of the shaft seal sleeve and the air seal plate near the oil slinger channel. The regulating chamber outlet is connected to the oil slinger chamber to facilitate the flow of oil from the regulating chamber outlet to the oil slinger chamber during the oil slingering process. Through this improvement, because the distance between the oil slinger chamber and the turbine shaft is larger than that between the connection point of the shaft seal sleeve and the air seal plate, during the oil slingering process, the oil can also easily flow towards the connection point of the shaft seal sleeve and the air seal plate while flowing towards the oil slinger chamber. This would still cause oil leakage. However, by designing the oil slinger regulating chamber, the direction of oil slinging is changed, allowing the oil to flow first to the oil slinger regulating chamber and then converge into the oil slinger chamber. This avoids the oil leakage caused by pressure buildup at the connection between the shaft seal sleeve and the air seal plate during the oil slinging process. The design of the distance between the regulating chamber inlet and the turbine shaft being smaller than the distance between the connection between the shaft seal sleeve and the air seal plate near the oil slinger flow channel and the turbine shaft ensures that the oil flows preferentially to the oil slinger regulating chamber, avoiding pressure buildup at the connection between the shaft seal sleeve and the air seal plate. The connection between the regulating chamber outlet and the oil slinger chamber ensures that the oil in the oil slinger regulating chamber converges into the larger oil slinger chamber.

[0010] As an improvement of this utility model, the inlet end of the regulating chamber is provided with an inlet slope. The inlet slope is inclined in a direction away from the shaft seal and away from the turbine shaft. Through this improvement, the oil entering the oil-slinging regulating chamber is guided, which can better avoid the formation of pressure on the machine surface at the connection between the shaft seal and the air seal plate, and help the oil flow to the outlet end of the regulating chamber.

[0011] As an improvement of this utility model, the outlet end of the regulating chamber is provided with an outlet slope of the regulating chamber. The outlet slope of the regulating chamber is inclined in a direction close to the air seal plate and away from the turbine shaft. Through this improvement, the oil in the oil-slinging regulating chamber is guided, so that the oil flows into the oil-slinging chamber along the outlet slope of the regulating chamber under the action of centrifugal force.

[0012] As an improvement of this utility model, the inclined surface at the inlet of the regulating cavity and the inclined surface at the outlet of the regulating cavity are connected by a smooth curved surface. This improvement ensures the smooth flow of oil in the oil-slinging regulating cavity.

[0013] As an improvement of this utility model, the shaft seal sleeve is provided with an extension block arranged circumferentially at one end near the oil slinger channel to increase the distance between the connection point of the shaft seal sleeve and the gas seal plate near the oil slinger channel and the turbine shaft. Through this improvement, more design space is provided for the design between the inlet end of the adjustment chamber and the turbine shaft, avoiding damage to the connection strength between the intermediate body and the floating bearing due to the small gap between the oil slinger adjustment chamber and the floating bearing, wherein the floating bearing is a standard part.

[0014] As an improvement of this utility model, a smooth oil-slinging slope is provided at the connection between the extension block and the air seal plate. The oil-slinging slope is inclined away from the oil-slinging adjustment chamber and away from the turbine shaft. With this improvement, when the oil passes through the connection between the extension block and the air seal plate, it is easier to enter the oil-slinging chamber directly along the oil-slinging slope, thereby reducing the probability of oil entering the connection between the extension block and the air seal plate.

[0015] As an improvement of this utility model, the oil return pipe is located at the lower end of the oil slinger regulating chamber. Through this improvement, the structural strength of the air seal plate is ensured. By utilizing the diversity of the central body structure, the oil return pipe is designed at the lower end of the oil slinger regulating chamber. Because of the connectivity between the oil slinger chamber and the oil slinger regulating chamber, the engine oil can also be smoothly returned. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall connection cross-sectional structure of this utility model.

[0017] Figure 2 This is a magnified schematic diagram of the oil-slinging regulating cavity of this utility model.

[0018] Figure 3 This is a schematic diagram of the air seal plate structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the central body oil-throwing adjustment cavity of this utility model.

[0020] Figure 5 This is a schematic diagram of the central body return oil pipeline outlet end of this utility model.

[0021] Reference numerals in the attached drawings: 1. Turbine shaft; 2. Shaft seal sleeve; 2.1. Extension block; 3. Floating bearing; 4. Air seal plate; 5. Intermediate body; 6. Oil slinger chamber; 7. Oil return pipe; 8. Oil slinger flow channel; 8.1. Oil slinger regulating chamber; 8.1.1. Regulating chamber inlet end; 8.1.2. Regulating chamber outlet end; 8.1.3. Regulating chamber inlet slope; 8.1.4. Regulating chamber outlet slope; 9. Oil slinger slope; 10. Pressure impeller; 11. First sealing ring; 12. Piston ring. Detailed Implementation

[0022] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0023] like Figure 1 As shown, an oil slinging structure near the pressure end of a turbocharger includes a turbine shaft 1. A pressure impeller 10 is installed at the pressure end of the turbine shaft 1. A shaft seal sleeve 2 and a floating bearing 3 are sleeved on the near pressure end of the turbine shaft 1. The shaft seal sleeve 2 and the floating bearing 3 are arranged along the axial direction of the turbine shaft 1. An air seal plate 4 is sleeved on the outer layer of the shaft seal sleeve 2. An intermediate body 5 is sleeved on the outer layer of the floating bearing 3. An oil slinging chamber 6 is provided at the connection between the air seal plate 4 and the intermediate body 5. The lower end of the oil slinging chamber 6 is connected to a return oil pipe 7.

[0024] like Figure 1-3 As shown, the oil-throwing chamber 6 is located on the side of the air-sealing plate 4 near the intermediate body 5. The oil-throwing chamber 6 is machined along the contour of the air-sealing plate 4. The intermediate body 5 is provided with an oil-throwing channel 8 on the side near the air-sealing plate 4. The oil-throwing channel 8 is connected to the oil-throwing chamber 6. The oil-throwing channel 8 is a system channel and not a design requirement. If the absolute sealing and abutment connection between the intermediate body 5 and the air-sealing plate 4 can be guaranteed during installation, there is no need for the design of an oil baffle or oil-throwing structure. In this utility model, the installation system gap between the intermediate body 5 and the air-sealing plate 4 is used as the oil-throwing channel 8 and has been modified.

[0025] The oil slinger channel 8 includes an oil slinger regulating chamber 8.1, which has an inlet end 8.1.1 and an outlet end 8.1.2. The distance between the inlet end 8.1.1 and the turbine shaft 1 is less than the distance between the connection point of the shaft seal sleeve 2 and the air seal plate 4 near the oil slinger channel 8 and the turbine shaft 1. The outlet end 8.1.2 is connected to the oil slinger chamber 6 to facilitate the flow of oil from the outlet end 8.1.2 to the oil slinger chamber 6 during the oil slingering process. The regulating cavity inlet end 8.1.1 is provided with a regulating cavity inlet slope 8.1.3, which is inclined away from the shaft seal 2 and away from the turbine shaft 1. The regulating cavity outlet end 8.1.2 is provided with a regulating cavity outlet slope 8.1.4, which is inclined close to the air seal plate 4 and away from the turbine shaft 1. The regulating cavity inlet slope 8.1.3 and the regulating cavity outlet slope 8.1.4 are connected by a smooth curved surface.

[0026] The shaft seal sleeve 2 is provided with an extension block 2.1 arranged circumferentially at one end near the oil slinger channel 8 to increase the distance between the connection point of the shaft seal sleeve 2 and the air seal plate 4 near the oil slinger channel 8 and the turbine shaft 1. The connection point of the extension block 2.1 and the air seal plate 4 is provided with a smooth oil slinger slope 9. The oil slinger slope 9 is inclined in a direction away from the oil slinger adjustment chamber 8.1 and away from the turbine shaft 1.

[0027] like Figure 1 , Figure 4 , Figure 5 As shown, the return oil pipe 7 is located at the lower end of the oil slinging regulating chamber 8.1. During the oil slinging process, the main flow path of the slinged oil is to first sling it into the oil slinging regulating chamber 8.1, and then into the oil slinging chamber 6. In the oil slinging chamber 6, it sinks down and then flows into the oil slinging regulating chamber 8.1. Finally, it returns to the oil circulation pipe from the return oil pipe 7 at the lower end of the oil slinging regulating chamber 8.1.

[0028] A piston ring 12 is provided at the end away from the center body at the connection between the shaft seal sleeve 2 and the air seal plate 4. The piston ring 12 is made of elastic alloy steel. Due to the design of the oil slinger adjustment chamber 8.1, the pressure at the piston ring 12 is also low, and the oil leakage is also less. However, since the connection between the shaft seal sleeve 2 and the air seal plate 4 is located in the inner ring of the oil slinger chamber 6, there is still a risk of oil leakage. Therefore, a double piston ring 12 is designed to provide oil sealing for long-term use safety. A mounting groove for installing the air seal plate 4 is provided on the side of the center body near the air seal plate 4. A first sealing ring 11 is provided between the side wall of the mounting groove and the side of the air seal plate 4. Because the oil gathers in the oil slinger chamber 6 during the oil slinging process, and the first sealing ring 11 is located in the outer ring of the oil slinger chamber 6, the first sealing ring 11 leaks less oil when the pressure in the oil slinger chamber 6 is low.

[0029] By using the oil-slinging structure near the pressure end of the turbocharger, not only is the design of the oil baffle plate reduced, but the weight of the air seal plate 4 is also reduced, thereby simplifying the design structure of the turbocharger, reducing the production cost of the turbocharger, and still ensuring the oil leakage prevention function of the turbocharger during use.

[0030] The above description only illustrates the preferred embodiment of this utility model and should not be construed as limiting the scope of the claims. This utility model is not limited to the above embodiments, and variations in its specific structure are permitted. All changes made within the scope of the independent claims of this utility model are also within the scope of protection of this utility model.

Claims

1. An oil slinging structure near the pressure end of a turbocharger, characterized in that: Includes a turbine shaft (1), with a shaft seal sleeve (2) and a floating bearing (3) fitted at the near-pressure end of the turbine shaft (1). The shaft seal sleeve (2) and the floating bearing (3) are arranged along the axial direction of the turbine shaft (1). An air seal plate (4) is fitted on the outer layer of the shaft seal sleeve (2), and an intermediate body (5) is fitted on the outer layer of the floating bearing (3). An oil slinger chamber (6) is provided at the connection between the air seal plate (4) and the intermediate body (5), and the lower end of the oil slinger chamber (6) is connected to a return oil pipe (7).

2. The oil slinger structure near the pressure end of a turbocharger according to claim 1, characterized in that: The oil-slinging chamber (6) is located on the side of the air-sealing plate (4) near the intermediate body (5), and the oil-slinging chamber (6) is machined along the contour of the air-sealing plate (4).

3. The oil slinging structure near the pressure end of a turbocharger according to claim 2, characterized in that: The intermediate body (5) is provided with an oil-throwing channel (8) on the side near the air seal plate (4), and the oil-throwing channel (8) is connected to the oil-throwing chamber (6).

4. The oil slinger structure near the pressure end of a turbocharger according to claim 3, characterized in that: The oil-throwing channel (8) includes an oil-throwing regulating chamber (8.1), which includes an inlet end (8.1.1) and an outlet end (8.1.2). 8.1.1) The distance between the turbine shaft (1) and the turbine shaft (1) is less than the distance between the connection point of the shaft sleeve (2) and the air seal plate (4) near the oil slinger (8) and the turbine shaft (1). The outlet end (8.1.2) of the regulating chamber is connected to the oil slinger (6) so that the oil flows from the outlet end (8.1.2) of the regulating chamber to the oil slinger (6) during the oil slinger process.

5. The oil slinging structure near the pressure end of a turbocharger according to claim 4, characterized in that: The regulating cavity inlet end (8.1.1) is provided with a regulating cavity inlet slope (8.1.3), which is inclined in a direction away from the shaft sleeve (2) and away from the turbine shaft (1).

6. The oil slinging structure near the pressure end of a turbocharger according to claim 5, characterized in that: The outlet end (8.1.2) of the regulating cavity is provided with an outlet inclined surface (8.1.4), which is inclined in a direction close to the air seal plate (4) and away from the turbine shaft (1).

7. The oil slinging structure near the pressure end of a turbocharger according to claim 6, characterized in that: The inlet inclined surface (8.1.3) of the regulating cavity and the outlet inclined surface (8.1.4) of the regulating cavity are connected by a smooth curved surface.

8. The oil slinger structure near the pressure end of a turbocharger according to claim 4, characterized in that: The shaft seal sleeve (2) has an extension block (2.1) arranged circumferentially at one end near the oil slinger channel (8) to increase the distance between the connection between the shaft seal sleeve (2) and the gas seal plate (4) on the side near the oil slinger channel (8) and the turbine shaft (1).

9. The oil slinging structure near the pressure end of a turbocharger according to claim 8, characterized in that: A smooth oil-throwing slope (9) is provided at the connection between the extension block (2.1) and the air seal plate (4). The oil-throwing slope (9) is inclined in a direction away from the oil-throwing adjustment chamber (8.1) and away from the turbine shaft (1).

10. The oil slinger structure near the pressure end of a turbocharger according to claim 4, characterized in that: The return oil pipe (7) is located at the lower end of the oil-throwing regulating chamber (8.1).

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