A mixed flow turbocharger bearing system with a water-cooled bearing housing

Abstract

The utility model discloses a mixed flow turbocharger bearing system with water -cooling bearing shell can cool down oil chamber, prolongs the life of the oil, and prevents oil leakage. Including water -cooling bearing shell, gas pressure impeller, turbine shaft, the axle portion of turbine shaft is installed in water -cooling bearing shell, be equipped with sliding bearing, thrust bearing and the floating sleeve of pressure end, the floating sleeve of vortex end between water -cooling bearing shell, the axle portion of turbine shaft, the upper end of water -cooling bearing shell is equipped with oil inlet, and the lower end of water -cooling bearing shell is equipped with oil return, and water -cooling bearing shell is equipped with oil room, and oil room is connected with oil inlet, oil return respectively, and oil inlet, oil return, oil room constitute lubricating system, and lubricating system is used to oil supply sliding bearing, thrust bearing, floating sleeve, be equipped with water inlet, water outlet on water -cooling bearing shell, and water -cooling bearing shell is equipped with water room, and water room is connected with water inlet, water outlet respectively, and water room, water inlet, water outlet constitute cooling system, and cooling system is used to carry out cooling to oil room.

Description

Technical Field

[0001] This utility model relates to the field of mixed-flow turbocharger technology, and in particular to a mixed-flow turbocharger bearing system with a water-cooled bearing housing. Background Technology

[0002] Currently, the bearing systems of mixed-flow turbochargers, both domestically and internationally, typically employ a single oil chamber for oil supply, lubrication, and cooling. Due to the high temperatures of the exhaust gas at the pressure end and the intake gas at the turbine end, the heat in the bearing system's oil chamber increases through radiant heat and heat conduction from the housing. Simultaneously, friction between the bearing and the lubricating oil also raises the oil chamber temperature. Increased oil chamber temperature can lead to lubricating oil deterioration, bearing deformation, and other problems. Furthermore, when the oil chamber temperature exceeds a certain value, it can cause safety accidents involving the diesel engine and turbocharger. Similarly, oil leakage during turbocharger bearing system operation can result in insufficient internal lubrication, accelerating wear on internal turbocharger components and ultimately affecting turbocharger operation. Therefore, a turbocharger bearing system with a water-cooled bearing housing, offering high stability, high sealing, and good transient response, is proposed. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a mixed-flow turbocharger bearing system with a water-cooled bearing housing, which can cool the oil chamber, extend the lubricating oil life, and prevent oil leakage.

[0004] The purpose of this utility model is achieved as follows: A mixed-flow turbocharger bearing system with a water-cooled bearing housing includes a water-cooled bearing housing, a compressor impeller, and a turbine shaft. The shaft portion of the turbine shaft is installed inside the water-cooled bearing housing. The turbine portion of the turbine shaft and the compressor impeller are located on the outer sides of both ends of the water-cooled bearing housing. The compressor impeller is installed on the pressure end of the turbine shaft. A sliding bearing, a thrust bearing, a floating sleeve for the pressure end, and a floating sleeve for the turbine end are provided between the water-cooled bearing housing and the shaft portion of the turbine shaft. The upper end of the water-cooled bearing housing is provided with an oil inlet, the lower end of the water-cooled bearing housing is provided with an oil return port, and an oil chamber is provided inside the water-cooled bearing housing. The oil chamber is connected to the oil inlet and the oil return port respectively. The oil inlet, the oil return port and the oil chamber form a lubrication system. The lubrication system is used to supply oil to the sliding bearing, the thrust bearing and the floating sleeve. The water-cooled bearing housing is provided with an inlet and an outlet, and a water chamber is provided inside the water-cooled bearing housing. The water chamber is connected to the inlet and the outlet respectively. The water chamber, the inlet and the outlet form a cooling system, which is used to cool the oil chamber.

[0005] Preferably, the water-cooled bearing housing has two inlets and two outlets. The two inlets are located on the upper sides of the water-cooled bearing housing, and the two outlets are located on the lower sides of the water-cooled bearing housing. The two inlets and two outlets, in conjunction with the plug, can form different water-cooling channels, thereby controlling the cooling water volume.

[0006] Preferably, the upper part of the water-cooled bearing housing has a transverse hole parallel to the turbine shaft, which communicates with the oil inlet. The sliding bearing has a radial through hole inside, which communicates with the transverse hole on the water-cooled bearing housing. The radial through hole on the sliding bearing is used to supply oil to the oil wedge surface and friction pair of the sliding bearing.

[0007] Preferably, the upper part of the water-cooled bearing housing has two oblique holes, the upper end of each oblique hole is connected to the horizontal hole on the water-cooled bearing housing, and the lower end of each oblique hole corresponds to the top of a floating sleeve. The oblique holes are used to supply oil to the floating sleeve of the pressure end and the floating sleeve of the vortex end.

[0008] Preferably, the floating sleeve is a fully floating bearing, with multiple radial through holes evenly arranged circumferentially on the floating sleeve, and bearing retaining rings arranged on both sides of the floating sleeve for axial limiting.

[0009] Preferably, the turbine shaft has a double sealing ring groove on the vortex end journal, and a vortex end sealing ring is respectively provided in each sealing ring groove.

[0010] Preferably, a shaft seal sleeve is fitted onto the pressure end of the turbine shaft. The shaft seal sleeve has a sealing ring groove, and a pressure end sealing ring is fitted inside the sealing ring groove. A partition is provided inside the water-cooled bearing housing, and the partition sleeve is fitted onto the shaft seal sleeve. The pressure end sealing ring seals the shaft seal sleeve and the partition. An O-ring is provided on the outer circle of the partition, and an O-ring is fitted inside the O-ring. The O-ring seal seals the water-cooled bearing housing and the partition. The water-cooled bearing housing axially limits one end of the partition through a step. An elastic retaining ring is fitted onto the partition through a groove. The elastic retaining ring axially limits the water-cooled bearing housing and the other end of the partition. The partition axially limits one end of the shaft seal sleeve, and the shaft seal sleeve axially limits the turbine shaft.

[0011] Preferably, an oil baffle is fitted onto the shaft seal sleeve, and the lower end of the oil baffle has an angle toward the vortex end.

[0012] Due to the adoption of the above technical solution, this utility model has the following beneficial effects: 1. The water-cooled bearing housing has an added cooling water chamber structure, which solves the problem of short lubricating oil life caused by high oil chamber temperature in existing turbocharger bearing systems; it also solves the problems of easy oil leakage, low operating stability and poor transient response of traditional turbochargers, effectively avoids radiant heat from the pressure vortex end and heat conduction from the housing, reduces the oil temperature inside the oil chamber, extends the service life of the bearing system and ensures the characteristics of the lubricating oil medium.

[0013] 2. The water-cooled bearing housing is equipped with two channels at each of the inlet and outlet, and the plug is used to control the cooling water volume and is suitable for different application environments.

[0014] 3. The oil chamber of the water-cooled bearing housing has an added lubrication oil passage, which better lubricates the friction pairs of the bearing and avoids the problem of insufficient lubricating oil supply.

[0015] 4. The floating sleeve is a fully floating bearing, and the bearing retaining ring is used for limiting, which effectively reduces the temperature of the floating sleeve and improves the reliability of the turbocharger bearing system.

[0016] 5. The lubricating oil seal structure was redesigned for the vortex end structure, which effectively reduced the possibility of oil leakage and improved the strength of the turbine shaft and the operational stability of the rotor system.

[0017] 6. The key feature of this bearing housing is the overall utility model design that integrates the bearing system with the bearing housing, rather than a design modification of a single component. Compared with traditional mixed-flow turbochargers, this utility model can better guarantee the operational stability, service life, high sealing performance, and transient response of the bearing system of the mixed-flow turbocharger. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the floating sleeve at the vortex end of this utility model; Figure 3 This is a schematic diagram of the pressure end sealing structure of this utility model; Figure 4 This is a schematic diagram of the double sealing ring structure of the turbine shaft of this utility model. Detailed Implementation

[0019] The orientation mentioned in this utility model is based on the bearing housing oil inlet facing upwards and the oil return port facing downwards. This is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, in the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] This invention adds a water chamber to the traditional bearing housing, employing a bottom-inlet system. Once the chamber is full, cooling water flows out from the top outlet, ensuring excellent heat exchange performance of the cooling water pipeline. Furthermore, by cooperating with the plug, the cooling water volume can be controlled to adapt to different application environments. The bearing housing oil chamber is designed with lubrication oil passages, supplying oil to the floating sleeve at the pressure volute end and the sliding bearing. The floating sleeve has six circumferentially distributed through holes to ensure lubricating oil flow; the sliding bearing has radially opened through holes to ensure sufficient lubricating oil on the oil wedge surface and friction pair. The floating sleeve is a fully floating bearing, using a bearing retainer ring for positioning. Compared to a semi-floating bearing, the relative rotational speed between the floating sleeve and the turbine shaft is reduced, resulting in less heat generated by friction and a lower floating sleeve temperature. The turbine shaft features a double sealing ring groove on the turbine side, with the shaft seal sleeve at the pressure end having a sealing ring groove, and the partition having an O-ring sealing groove. Combined with the oil baffle plate, this effectively prevents oil leakage at the pressure volute end.

[0021] See Figures 1-4 A mixed-flow turbocharger bearing system with a water-cooled bearing housing includes a water-cooled bearing housing 14, a compressor impeller 2, and a turbine shaft 16. The shaft portion of the turbine shaft 16 is installed inside the water-cooled bearing housing 14. The turbine portion of the turbine shaft 16 and the compressor impeller 2 are located on the outer sides of both ends of the water-cooled bearing housing 14. The compressor impeller 2 is installed at the pressure end (the end closer to the compressor impeller) of the turbine shaft 16. A sliding bearing 9, a thrust bearing 10, a floating sleeve at the pressure end, and a floating sleeve at the turbine end (the end closer to the turbine) are provided between the water-cooled bearing housing 14 and the shaft portion of the turbine shaft 16. An oil inlet 17 is provided at the upper end of the water-cooled bearing housing 14. The lower end of the bearing housing 14 is provided with an oil return port 18. The water-cooled bearing housing 14 is provided with an oil chamber 23. The oil chamber 23 is connected to the oil inlet 17 and the oil return port 18 respectively. The oil inlet 17, the oil return port 18 and the oil chamber 23 form a lubrication system. The lubrication system is used to supply oil to the sliding bearing 9, the thrust bearing 10 and the floating sleeve 12. The water-cooled bearing housing 14 is provided with a water inlet 19 and a water outlet 20. The water-cooled bearing housing 14 is provided with a water chamber 22. The water chamber 22 is connected to the water inlet 19 and the water outlet 20 respectively. The water chamber 22, the water inlet 19 and the water outlet 20 form a cooling system. The cooling system is used to cool the oil chamber 23.

[0022] The water-cooled bearing housing 14 has two inlets 19 and two outlets 20. The two inlets 19 are located on the upper sides of the water-cooled bearing housing 14, and the two outlets 20 are located on the lower sides of the water-cooled bearing housing 14. The two inlets 19 and two outlets 20 can form different water-cooling channels by cooperating with the plug 21, thereby controlling the cooling water volume.

[0023] The upper part of the water-cooled bearing housing 14 has a transverse hole parallel to the turbine shaft 16, which is connected to the oil inlet 17. The sliding bearing 9 has a radial through hole inside, which is connected to the transverse hole on the water-cooled bearing housing 14. The radial through hole on the sliding bearing 9 is used to supply oil to the oil wedge surface and friction pair of the sliding bearing 9.

[0024] The upper part of the water-cooled bearing housing 14 has two oblique holes. The upper end of each oblique hole is connected to the horizontal hole on the water-cooled bearing housing 14. The lower end of each oblique hole corresponds to the top of a floating sleeve 12. The oblique holes are used to supply oil to the floating sleeve of the pressure end and the floating sleeve of the volute end.

[0025] The floating sleeve 12 is a fully floating bearing. Multiple radial through holes are evenly arranged in the circumferential direction on the floating sleeve 12. Bearing retaining rings 11 are arranged on both sides of the floating sleeve 12 for axial limiting.

[0026] The turbine shaft 16 has a double sealing ring groove on the vortex end journal, and a vortex end sealing ring 13 is respectively installed in each sealing ring groove.

[0027] The turbine shaft 16 is fitted with a shaft seal sleeve 3 at the pressure end. The shaft seal sleeve 3 has a sealing ring groove, and a pressure end sealing ring 4 is provided in the sealing ring groove. A partition 7 is provided inside the water-cooled bearing housing 14. The partition 7 is fitted on the shaft seal sleeve 3. The pressure end sealing ring 4 seals the shaft seal sleeve 3 and the partition 7. An O-ring is provided on the outer circle of the partition 7. An O-ring is provided in the O-ring, and an O-ring 8 is provided in the O-ring. The O-ring 8 seals the water-cooled bearing housing 14 and the partition 7. The water-cooled bearing housing 14 axially limits one end of the partition 7 through a step. An elastic retaining ring 5 is fitted on the partition 7 through a groove. The elastic retaining ring 5 axially limits the water-cooled bearing housing 14. The elastic retaining ring 5 axially limits the other end of the partition 7. The partition 7 axially limits one end of the shaft seal sleeve 3. The shaft seal sleeve 3 axially limits the turbine shaft 16.

[0028] An oil baffle 6 is fitted onto the shaft seal sleeve 3, and the lower end of the oil baffle 6 has an inclination angle toward the vortex end. Example

[0029] like Figure 1The diagram shows a structural schematic of a mixed-flow turbocharger bearing system with a water-cooled bearing housing. The main body of the mixed-flow turbocharger is shown. Adding a compressor housing and a volute housing to the compressor end completes the mixed-flow turbocharger. The system includes a connecting nut 1, a compressor impeller 2, a shaft seal sleeve 3, a pressure end sealing ring 4, an elastic retaining ring 5, an oil baffle 6, a partition 7, an O-ring seal 8, a sliding bearing 9, a thrust bearing 10, a bearing retaining ring 11, a floating sleeve 12, a volute end sealing ring 13, a water-cooled bearing housing 14, a heat insulation cover 15, a turbine shaft 16, an oil inlet 17, an oil return port 18, a water inlet 19, a water outlet 20, a plug 21, a water chamber 22, and an oil chamber 23. Lubricating oil enters through inlet 17 and flows out through lubricating oil passage to outlet 18. Two oblique holes are opened inside the water-cooled bearing housing 14 to supply oil to the floating sleeve at the pressure volute end. A hole parallel to the shaft is opened inside the water-cooled bearing housing 14, and a radial through hole is opened inside the sliding bearing 9. The two holes are perpendicular to each other and are used to supply oil to the oil wedge surface and friction pair of the sliding bearing 9. The cooling water inlet 19 and outlet 20 are designed with two channels. Combined with the plug 21, different combinations of inlet and outlet channels can be selected to control the cooling water volume. It should be noted that the flow rate of lubricating oil and cooling water depends on the cross-sectional area of ​​the inlet pipe. There can be one or more plugs 21. Different numbers of inlet and outlet channels result in different flow velocities of circulating water through the cooling water chamber, thus changing the circulating water volume. Example

[0030] like Figure 2 As shown, the floating sleeve 12 is a fully floating bearing, with one pressure vortex end on each side and identical structures, and six through holes evenly arranged circumferentially. Figure 1 Bearing retaining rings 11 are arranged on both sides of the floating sleeve 12 for axial positioning. The advantage of this arrangement is that it can better supply oil to the friction pair of the floating sleeve 12 and reduce the temperature of the floating sleeve. Example

[0031] like Figure 3 As shown, the shaft seal sleeve 3 has a sealing ring groove, and a pressure end sealing ring 4 is provided in the sealing ring groove, forming a sealing structure with the partition plate 7; the partition plate 7 has an O-ring sealing groove, and an O-ring sealing ring 8 is provided in the O-ring sealing groove, forming a sealing structure with the water-cooled bearing housing 14. Compared with the traditional oil slinger, this utility model redesigns the oil baffle plate 6. A certain angle is designed below the oil baffle plate. When the lubricating oil flows towards the return oil port, this structure can block most of the lubricating oil from flowing to the pressure end, thereby avoiding oil leakage at the pressure end. Example

[0032] like Figure 4 As shown, the turbine shaft 16 has double sealing ring grooves, and the turbine end journal is thicker than that of a conventional turbine shaft. The advantage of this structure is that it effectively reduces the possibility of oil leakage in the mixed-flow turbocharger turbine and improves the strength of the turbine shaft.

[0033] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A mixed-flow turbocharger bearing system with a water-cooled bearing housing, characterized in that: It includes a water-cooled bearing housing, a compressor impeller, and a turbine shaft. The shaft portion of the turbine shaft is installed inside the water-cooled bearing housing. The turbine portion of the turbine shaft and the compressor impeller are located on the outer sides of both ends of the water-cooled bearing housing. The compressor impeller is installed on the pressure end of the turbine shaft. A sliding bearing, a thrust bearing, a floating sleeve for the pressure end, and a floating sleeve for the vortex end are provided between the water-cooled bearing housing and the shaft portion of the turbine shaft. The upper end of the water-cooled bearing housing is provided with an oil inlet, the lower end of the water-cooled bearing housing is provided with an oil return port, and an oil chamber is provided inside the water-cooled bearing housing. The oil chamber is connected to the oil inlet and the oil return port respectively. The oil inlet, the oil return port and the oil chamber form a lubrication system. The lubrication system is used to supply oil to the sliding bearing, the thrust bearing and the floating sleeve. The water-cooled bearing housing is provided with an inlet and an outlet, and a water chamber is provided inside the water-cooled bearing housing. The water chamber is connected to the inlet and the outlet respectively. The water chamber, the inlet and the outlet form a cooling system, which is used to cool the oil chamber.

2. The mixed-flow turbocharger bearing system with a water-cooled bearing housing according to claim 1, characterized in that: The water-cooled bearing housing has two inlets and two outlets. The two inlets are located on the upper sides of the water-cooled bearing housing, and the two outlets are located on the lower sides of the water-cooled bearing housing. The two inlets and two outlets are used to cooperate with the plug to form a water-cooling channel.

3. The mixed-flow turbocharger bearing system with a water-cooled bearing housing according to claim 1, characterized in that: The upper part of the water-cooled bearing housing has a horizontal hole parallel to the turbine shaft, which is connected to the oil inlet. The sliding bearing has a radial through hole inside, which is connected to the horizontal hole on the water-cooled bearing housing. The radial through hole on the sliding bearing is used to supply oil to the oil wedge surface and friction pair of the sliding bearing.

4. A mixed-flow turbocharger bearing system with a water-cooled bearing housing according to claim 3, characterized in that: The upper part of the water-cooled bearing housing has two oblique holes. The upper end of each oblique hole is connected to the horizontal hole on the water-cooled bearing housing. The lower end of each oblique hole corresponds to the top of a floating sleeve. The oblique holes are used to supply oil to the floating sleeve of the pressure end and the floating sleeve of the volute end.

5. A mixed-flow turbocharger bearing system with a water-cooled bearing housing according to claim 1, characterized in that: The floating sleeve is a fully floating bearing. Multiple radial through holes are evenly arranged around the floating sleeve, and bearing retaining rings are arranged on both sides of the floating sleeve for axial positioning.

6. A mixed-flow turbocharger bearing system with a water-cooled bearing housing according to claim 1, characterized in that: The turbine shaft has a double sealing ring groove on the vortex end journal, and a vortex end sealing ring is installed in each sealing ring groove.

7. A mixed-flow turbocharger bearing system with a water-cooled bearing housing according to claim 1, characterized in that: The turbine shaft is fitted with a shaft seal sleeve at the pressure end. The shaft seal sleeve has a sealing ring groove, and a pressure end sealing ring is installed in the sealing ring groove. A partition is provided inside the water-cooled bearing housing, and the partition sleeve is fitted onto the shaft seal sleeve. The pressure end sealing ring seals the shaft seal sleeve and the partition. An O-ring is provided on the outer circle of the partition, and an O-ring is installed in the O-ring. The O-ring seals seal the water-cooled bearing housing and the partition. The water-cooled bearing housing axially limits one end of the partition through a step. An elastic retaining ring is fitted onto the partition through a groove. The elastic retaining ring axially limits the water-cooled bearing housing and the other end of the partition. The partition axially limits one end of the shaft seal sleeve, and the shaft seal sleeve axially limits the turbine shaft.

8. A mixed-flow turbocharger bearing system with a water-cooled bearing housing according to claim 7, characterized in that: An oil baffle is fitted onto the shaft seal sleeve, and the lower end of the oil baffle has an angle facing the vortex end.

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