Rotor structure of electric auxiliary supercharger supported by ball bearing

Abstract

The invention provides a rotor structure of an electric auxiliary supercharger supported by a ball bearing. The rotor structure comprises a turbine impeller, a rotating shaft, an integral double-row angular contact ball bearing, a bearing inner ring spacer sleeve, a motor magnetic rotor, a shaft sealing sleeve, a compressor impeller and a shaft end nut. The electric auxiliary supercharger has the beneficial effects that the rotor adopts an integral double-row angular contact ball bearing supporting structure and has the characteristics of high bearing performance, high responsiveness and the like, the problems that a cantilever of the electric auxiliary supercharger is too long and the mass of the rotor is heavy are solved through the structural arrangement of the rotor, and the use requirements in high rotating speed and strong impact vibration environments are met; the bearing body is provided with the cooling water cavity, so that the working stability of the bearing can be improved; the motor shell is provided with a cooling water cavity so as to effectively control the working environment temperature of the motor; the sealing ring is arranged between the motor magnetic rotor and the integral double-row angular contact ball bearing, so that lubricating oil entering the motor is reduced, and high-speed oil stirring loss of the motor rotor is avoided; in addition, high-temperature gas is isolated, and stable work of the motor and the bearing is facilitated; the top of the bearing body is provided with an oil inlet hole to ensure that lubricating oil cools the bearing, and the side bottom is provided with an oil return hole to enable the lubricating oil to flow out.

Description

Technical Field

[0001] The invention belongs to the field of power machinery, and in particular relates to a rotor structure of an electric auxiliary supercharger supported by a ball bearing. Background Art

[0002] The power following capability of the power system depends on the dynamic response capability of the diesel engine, and the dynamic response capability of the diesel engine is mainly limited by the response speed of the supercharging system. During the acceleration of the engine, the amount of fuel injected into the cylinder can increase rapidly within milliseconds, but the intake volume depends on the increase of the supercharger speed, and the supercharger speed depends on the increase of the cylinder exhaust energy, that is, the acceleration of the supercharger essentially depends on the enhancement of the combustion in the cylinder. To solve the problem of strong oil-gas coupling during the acceleration of the power system, starting from the supercharging system, the electric-assisted supercharging is to integrate the motor into the conventional supercharger. Due to the introduction of high-speed motors, the electric-assisted supercharging can increase the supercharger speed and intake volume before the exhaust energy increases, which to a certain extent realizes the decoupling of the supercharger and the engine, and significantly improves the acceleration performance of the diesel engine. Compared with traditional turbochargers, the electric-assisted supercharger has a longer axial length, a significantly increased mass on the shaft, and a more diversified unbalanced force. The above unfavorable factors make the design of the rotor system more difficult, and it is necessary to seek a highly stable electric-assisted supercharger rotor structure. Summary of the invention

[0003] In view of this, the present invention aims to provide a rotor structure of an electrically assisted supercharger supported by a ball bearing, wherein the rotor structure is compact so as to achieve a high dynamic response of the supercharging system.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A rotor structure of an electrically assisted supercharger supported by a ball bearing comprises a turbine impeller, a heat shield, a bearing body, a radial bearing, a rotating shaft, a motor stator, a back plate, a compressor impeller, a shaft end nut, a motor magnetic rotor and a motor housing, wherein a heat shield is installed behind the turbine impeller, one side of the turbine impeller is connected to one end of the rotating shaft, a radial bearing is sleeved on the rotating shaft, the outer side of the radial bearing is sleeved on the bearing body, and the bearing body is arranged on one side of the heat shield, the middle part of the rotating shaft is also connected to the motor magnetic rotor, the outer side of the motor magnetic rotor is sleeved on the motor stator, the outer side of the motor stator is sleeved on the motor housing, a back plate is installed on one side of the motor housing, a compressor impeller is installed on the other end of the rotating shaft, and the compressor impeller is mounted to the rotating shaft through the shaft end nut.

[0006] Furthermore, it also includes a turbine end sealing ring, and a turbine end sealing ring is also installed at the connection between the turbine impeller and the rotating shaft.

[0007] Furthermore, it also includes a shaft sealing sleeve, which is sleeved to the other end of the rotating shaft.

[0008] Furthermore, it also includes a bearing inner ring spacer sleeve, a bearing outer ring cover and a spacer sleeve sealing ring. The bearing inner ring spacer sleeve and the spacer sleeve sealing ring are also installed at the connection between the radial bearing and the rotating shaft. The bearing inner ring spacer sleeve and the spacer sleeve sealing ring are both sleeved in the bearing outer ring cover.

[0009] Furthermore, it also includes a compressor end sealing ring, and a compressor end sealing ring is also installed at the connection between the shaft sealing sleeve and the rotating shaft.

[0010] Furthermore, the radial bearing is an integral double-row angular contact ball bearing.

[0011] Furthermore, the bearing body is lubricated by oil spraying.

[0012] Furthermore, the bearing body and the motor housing are both provided with cooling water chambers for controlling the working environment temperature of the motor and the bearing.

[0013] Furthermore, a bearing water cooling channel is provided in the bearing body.

[0014] Furthermore, the motor housing is provided with a water cooling channel for the motor.

[0015] Furthermore, the bearing body is provided with an oil inlet hole and an oil return port, the oil return port is opened at the bottom of the bearing body, and the motor housing and the bearing body are interconnected.

[0016] Furthermore, the turbine impeller and the shaft are friction welded to form the turbine shaft.

[0017] Compared with the prior art, the rotor structure of the electrically assisted supercharger supported by a ball bearing according to the present invention has the following advantages:

[0018] (1) The rotor structure of an electrically assisted supercharger supported by a ball bearing described in the present invention adopts an integral double-row angular contact ball bearing support. The structure has the characteristics of high load-bearing capacity and high responsiveness. Through the structural arrangement of the rotor, the problem of long cantilever and heavy mass of the electrically assisted supercharger rotor is solved, and the use requirements in high speed and strong impact and vibration environments are met.

[0019] (2) The rotor structure of the electric-assisted supercharger supported by a ball bearing described in the present invention has a structural arrangement that keeps the motor rotor away from the high-temperature turbine (the maximum temperature of the turbine is up to 750°C), thereby avoiding the problem of high-temperature demagnetization failure during its operation.

[0020] (3) The rotor structure of the electric-assisted supercharger supported by a ball bearing described in the present invention has two cooling water chambers provided on the bearing body and the motor housing, which can effectively control the working environment temperature of the motor and improve the temperature of the bearing.

[0021] (4) The rotor structure of the electric auxiliary supercharger supported by a ball bearing described in the present invention has sealing rings arranged beside the turbine impeller and the compressor impeller. The motor and the bearing are separated from the two wheels to reduce the amount of lubricating oil and high-temperature gas entering the motor. A sealing ring is arranged between the motor magnetic rotor and the integral double-row angular contact ball bearing to separate the motor and the bearing from the two wheels to reduce the amount of lubricating oil entering the motor and avoid high-speed oil stirring loss of the motor rotor.

[0022] (5) The rotor structure of an electrically assisted supercharger supported by a ball bearing described in the present invention has an oil inlet hole at the top of the bearing body to ensure that the lubricating oil cools the bearing, and an oil return hole at the bottom side to allow the lubricating oil to flow out. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a schematic cross-sectional view of the overall structure described in an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1. Turbine impeller; 2. Heat shield; 3. Bearing body; 4. Integral double-row angular contact ball bearing; 5. Rotating shaft; 6. Motor stator; 7. Back plate; 8. Compressor impeller; 9. Shaft end nut; 10. Compressor end sealing ring; 11. Shaft seal sleeve; 12. Motor magnetic rotor; 13. Motor housing; 14. Bearing inner ring spacer sleeve; 15. Bearing outer ring cover; 16. Turbine end sealing ring; 17. Bearing water cooling channel; 18. Motor water cooling channel; 19. Spacer sleeve sealing ring. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0030] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0031] like Figure 1 As shown, a rotor structure of an electric auxiliary supercharger supported by a ball bearing includes a turbine impeller 1, a heat shield 2, a bearing body 3, a radial bearing, a rotating shaft 5, a motor stator 6, a back plate 7, a compressor impeller 8, a shaft end nut 9, a compressor end sealing ring 10, a shaft seal sleeve 11, a motor magnetic rotor 12, a motor housing 13, a bearing inner ring spacer sleeve 14, a bearing outer ring cover 15, a turbine end sealing ring 16, a bearing water cooling channel 17, a motor water cooling channel 18 and a spacer sleeve sealing ring 19. The above parts are pressed by tightening the shaft end nut 9 to give a corresponding torque. A seal is also arranged between the turbine impeller 1 and the bearing body 3, which can greatly reduce the lubricating oil and gas entering the bearing body 3. A seal ring is arranged between the motor magnetic rotor 12 and the integral double-row angular contact ball bearing 4 to separate the motor, the bearing and the two wheels, reduce the lubricating oil entering the motor, and avoid the high-speed oil stirring loss of the motor magnetic rotor 12.

[0032] In a preferred embodiment of the present invention, the radial bearing is an integral double-row angular contact ball bearing 4, which can withstand radial loads. The integral double-row angular contact ball bearing 4 can also withstand axial loads.

[0033] In a preferred embodiment of the present invention, the bearing body 3 is lubricated by oil spraying. The oil enters the bearing through the oil inlet on the bearing body for lubrication and then flows out through the oil return port.

[0034] In a preferred embodiment of the present invention, the bearing body 3 and the motor housing 13 are both provided with cooling water chambers, which can effectively control the working environment temperature of the motor and the bearing.

[0035] In a preferred embodiment of the present invention, the bearing body 3 is provided with an oil inlet hole and an oil return port. The oil return port is opened at the bottom of the bearing body 3. The motor housing 13 and the bearing body 3 are interconnected to ensure that the lubricating oil flows out from the oil return port of the bearing body 3 and does not accumulate in the bearing body 3.

[0036] In a preferred embodiment of the present invention, the turbine impeller 1 and the rotating shaft 5 are friction welded to form the turbine rotating shaft, the inner ring of the integral double-row angular contact ball bearing 4 is radially matched with the rotating shaft 5, the inner ring end face of the integral double-row angular contact ball bearing 4 is pressed and fitted with the axial end face of the rotating shaft 5, the bearing inner ring spacer sleeve 14 is radially matched with the rotating shaft 5, and the axial direction is pressed and fitted, the motor magnetic rotor 12 is radially matched with the rotating shaft 5, and the axial direction is pressed and fitted with the bearing inner ring spacer sleeve 14, the shaft seal sleeve 11 is radially matched with the rotating shaft 5, and the axial direction is pressed and fitted, the compressor impeller 8 is radially matched with the rotating shaft 5, and the axial direction is pressed and fitted, and the axial components are locked by giving the corresponding torque through the shaft end nut 9. At the same time, the outer ring of the integral double-row angular contact ball bearing 4 is radially matched with the inner hole of the bearing body 3, and the axial direction is the outer ring cover 15 locked on the bearing body 3 by screws to ensure the axial limit of the bearing.

[0037] In a preferred embodiment of the present invention, the rotor structure also has a dual water cooling structure. The bearing water cooling channel 17 is arranged on the bearing body 3, mainly to ensure that the temperature at the turbine is 750°C when the bearing works at high temperature, and part of the heat is taken away by cooling water. The water cooling channel 18 of the motor is arranged on the motor housing 13, and part of the heat of the motor is taken away by cooling water.

[0038] In a preferred embodiment of the present invention, a sealing ring is arranged between the turbine impeller 1 and the integral double-row angular contact ball bearing 4 to prevent the high-temperature gas of the turbine from entering the bearing body 3, and at the same time reduce the lubricating oil of the bearing body 3 from entering the vicinity of the turbine impeller 1. A sealing ring is arranged between the compressor impeller 8 and the motor magnetic rotor 12 to prevent the lubricating oil in the motor housing 13 from flowing into the vicinity of the compressor impeller 8. A sealing ring is arranged between the motor magnetic rotor 12 and the integral double-row angular contact ball bearing 4 to separate the motor and the bearing from the two wheels, reduce the lubricating oil entering the motor, and avoid the high-speed oil stirring loss of the motor rotor.

[0039] Advantages of the present invention:

[0040] (1) The rotor structure of the present invention adopts an integral double-row angular contact ball bearing support, which has the characteristics of high load-bearing capacity and high responsiveness. Through the structural arrangement of the rotor, the problem of long cantilever and heavy mass of the electric-assisted supercharger rotor is solved, and the requirements for use in high-speed and strong impact and vibration environments are met.

[0041] (2) The structural arrangement of the present invention keeps the motor rotor away from the high-temperature turbine (the maximum temperature of the turbine is 750° C.), thereby avoiding the problem of high-temperature demagnetization failure during its operation.

[0042] (3) The bearing body and the motor housing of the present invention are provided with two cooling water chambers, which can effectively control the working environment temperature of the motor and improve the temperature of the bearing.

[0043] (4) The present invention provides sealing rings beside the turbine impeller and the compressor impeller. The motor and the bearing are separated from the two wheels, reducing the amount of lubricating oil and high-temperature gas entering the motor. A sealing ring is provided between the motor magnetic rotor and the integral double-row angular contact ball bearing to separate the motor and the bearing from the two wheels, reducing the amount of lubricating oil entering the motor and avoiding the high-speed oil stirring loss of the motor rotor.

[0044] (5) The bearing body of the present invention is provided with an oil inlet hole at the top to ensure that the lubricating oil cools the bearing, and an oil return hole is provided at the bottom to allow the lubricating oil to flow out.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotor structure of an electrically assisted supercharger supported by a ball bearing, characterized in that: The invention comprises a turbine impeller (1), a heat shield (2), a bearing body (3), a radial bearing, a rotating shaft (5), a motor stator (6), a back plate (7), a compressor impeller (8), a shaft end nut (9), a shaft seal sleeve (11), a motor magnetic rotor (12), a motor housing (13) and a turbine end sealing ring (16), wherein a heat shield (2) is arranged behind the turbine impeller (1), one side of the turbine impeller (1) is connected to one end of the rotating shaft (5), a radial bearing is sleeved on the rotating shaft (5), a bearing body (3) is sleeved on the outer side of the radial bearing, and the bearing body (3) is arranged on the heat shield. On one side of the cover (2), the middle part of the rotating shaft (5) is also connected to the motor magnetic rotor (12), the motor magnetic rotor (12) is externally sleeved with the motor stator (6), the motor stator (6) is externally sleeved with the motor housing (13), a back plate (7) is installed on one side of the motor housing (13), a compressor impeller (8) is installed on the other end of the rotating shaft (5), and the compressor impeller (8) is installed to the rotating shaft (5) through a shaft end nut (9); a turbine end sealing ring (16) is also installed at the connection between the turbine impeller (1) and the rotating shaft (5), and the shaft sealing sleeve (11) is sleeved to the other end of the rotating shaft (5).

2. The rotor structure of an electrically assisted supercharger supported by a ball bearing according to claim 1, characterized in that: The invention also comprises a bearing inner ring spacer sleeve (14), a bearing outer ring stop cover (15) and a spacer sleeve sealing ring (19); the bearing inner ring spacer sleeve (14) and the spacer sleeve sealing ring (19) are respectively installed at the connection between the radial bearing and the rotating shaft (5); the bearing inner ring spacer sleeve (14) and the spacer sleeve sealing ring (19) are both sleeved in the bearing outer ring stop cover (15).

3. The rotor structure of an electrically assisted supercharger supported by a ball bearing according to claim 1, characterized in that: It also includes a compressor end sealing ring (10), and a compressor end sealing ring (10) is also installed at the connection between the shaft sealing sleeve (11) and the rotating shaft (5).

4. The rotor structure of an electrically assisted supercharger supported by a ball bearing according to claim 1, characterized in that: The radial bearing is an integral double-row angular contact ball bearing (4).

5. The rotor structure of an electrically assisted supercharger supported by a ball bearing according to claim 1, characterized in that: The bearing body (3) adopts an oil spray lubrication method.

6. The rotor structure of an electrically assisted supercharger supported by a ball bearing according to claim 1, characterized in that: The bearing body (3) and the motor housing (13) are both provided with cooling water chambers for controlling the working environment temperature of the motor and the bearing.

7. The rotor structure of an electrically assisted supercharger supported by a ball bearing according to claim 6, characterized in that: A bearing water cooling channel (17) is provided in the bearing body (3).

8. The rotor structure of an electrically assisted supercharger supported by a ball bearing according to claim 6, characterized in that: The motor housing (13) is provided with a water cooling channel (18) for the motor.

9. The rotor structure of an electrically assisted supercharger supported by a ball bearing according to claim 1, characterized in that: The bearing body (3) is provided with an oil inlet hole and an oil return port, the oil return port is opened at the bottom of the bearing body (3), and the motor housing (13) and the bearing body (3) are interconnected.

10. The rotor structure of an electrically assisted supercharger supported by a ball bearing according to claim 1, characterized in that: The turbine impeller (1) and the rotating shaft (5) are friction welded to form the turbine rotating shaft (5).

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