Floating-ring-bearing-supported motor mid-set type electric auxiliary supercharging rotor structure

Abstract

The invention provides a floating-ring-bearing-supported motor centrally-mounted electric auxiliary supercharging rotor structure. The floating-ring-bearing-supported motor centrally-mounted electric auxiliary supercharging rotor structure comprises a compressor impeller, a shaft end nut, a shaft sealing sleeve, a thrust plate, an auxiliary bearing, a floating ring bearing, a motor stator, a motor rotor and a turbine rotating shaft. Compared with an existing large-air-gap type electric auxiliary turbocharger, the large-air-gap type electric auxiliary turbocharger has the advantages that it is guaranteed that the gravity center of a rotor system is located between the two floating ring bearings, the difficulty of dynamic balance of the rotor system is lowered, the working stability of a shaft system is improved, meanwhile, a small amount of lubricating oil can flow into the position between the motor stator and the rotor through the bearing oil baffle, and the service life of the motor is prolonged. On the basis of not influencing the performance of the motor, heat dissipation can be provided for the motor, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The present invention belongs to the field of turbomachinery, and particularly relates to an electric-assisted supercharger rotor structure with a motor in the middle supported by floating ring bearings. Background Art

[0002] When a turbocharger operates, due to the inertial effect of the turbine, there is a turbine lag effect under low engine speed conditions, resulting in a series of problems such as insufficient engine power and black smoke. Therefore, the technical means of motor-assisted turbocharging is usually adopted to eliminate the turbine lag and improve the low-speed performance of the engine.

[0003] However, in the existing electric-assisted turbocharger, the motor rotor is arranged at the inlet position of the compressor impeller, making the rotor become a cantilever beam structure, causing the center of gravity of the supercharger rotor to shift towards the compressor end, increasing the instability of the rotor support, reducing the reliability of the rotor operation. At the same time, it poses great difficulty to the dynamic balance of the rotor system and increases the manufacturing cost of the supercharger. Summary of the Invention

[0004] In view of this, the present invention aims to propose an electric-assisted supercharger rotor structure with a motor in the middle supported by floating ring bearings to solve at least one of the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the technical solution of the present invention is realized as follows: An electric-assisted supercharger rotor structure with a motor in the middle supported by floating ring bearings includes a compressor impeller, an axle end nut, a shaft seal sleeve, a thrust washer, an auxiliary bearing, a floating ring bearing, a motor stator, a motor rotor, and a turbine rotating shaft. The turbine rotating shaft is respectively installed with the compressor impeller. One end of the compressor impeller is the compressor end, and the other end is the turbine end. The turbine rotating shaft passes through the compressor impeller at the compressor end and is installed with an axle end nut. One end of the turbine rotating shaft close to the compressor impeller at the compressor end is sequentially installed with a shaft seal sleeve, a thrust washer, an auxiliary bearing, and a motor rotor from left to right. The floating ring bearing includes a turbine-end floating ring bearing and a compressor-end floating ring bearing. The compressor-end floating ring bearing is installed outside the auxiliary bearing, and the turbine-end floating ring bearing is installed at one end of the compressor impeller close to the turbine end of the turbine rotating shaft. The motor stator is installed outside the motor rotor.

[0006] Further, it further includes an oil baffle and a thrust bearing plate. The oil baffle is installed between the shaft seal sleeve and the thrust washer, and the thrust bearing plate is installed between the thrust washer and the auxiliary bearing, and the oil baffle presses on the thrust bearing plate after passing through the turbine rotating shaft.

[0007] Further, it further includes a bearing retaining ring, and the bearing retaining ring is installed between the auxiliary bearing and the compressor-end floating ring bearing.

[0008] Further, it also includes a bearing oil baffle and a bearing housing. The bearing oil baffle includes a volute-end bearing oil baffle and a compressor-end bearing oil baffle, and the bearing housing includes a volute-end bearing housing and a compressor-end bearing housing. The volute-end bearing oil baffle and the compressor-end bearing oil baffle are respectively installed in the volute-end bearing housing and the compressor-end bearing housing. The compressor-end bearing housing is installed on the stator support seat after passing through the turbine rotating shaft, and the turbine rotating shaft penetrates into the volute floating-ring bearing of the volute-end bearing housing from the turbine end.

[0009] Further, it also includes a stator support seat and a compressor back plate. The stator support seat is installed on the motor stator, and the compressor back plate passes through the turbine rotating shaft and the shaft seal sleeve and then abuts against the compressor-end bearing housing, while ensuring that the compressor back plate is pressed tightly against the oil baffle.

[0010] Further, the motor rotor is located between the two floating-ring bearings and is relatively fixed to the turbine rotating shaft. It rotates together with the supercharger rotor when the supercharger is working. After heating the motor rotor, it is inserted into the turbine rotating shaft, and the end face of the motor rotor is pressed tightly against the shaft shoulder. After the motor rotor cools down and it is determined that it is locked with the turbine rotating shaft, the motor stator is fixedly installed on the stator support seat.

[0011] Further, after heating the auxiliary bearing, it is passed through the turbine rotating shaft and ensured that the end face of the auxiliary bearing abuts against the motor rotor. After the auxiliary bearing cools down and it is determined that it is locked with the turbine rotating shaft, the thrust washer is passed through the turbine rotating shaft and abuts against the auxiliary bearing.

[0012] Further, the shaft seal sleeve is passed through the turbine rotating shaft and the central hole of the oil baffle and then pressed on the thrust washer.

[0013] Compared with the prior art, the floating-ring-bearing-supported motor center-mounted electric auxiliary supercharger rotor structure of the present invention has the following advantages: For the floating-ring-bearing-supported motor center-mounted electric auxiliary supercharger rotor structure of the present invention, without changing the floating-ring-bearing support method, the motor rotor is arranged between the two floating-ring bearings, so as to ensure that the center of gravity of the rotor is located between the two supports of the rotor, increasing the stability of the floating-ring-bearing support, reducing the difficulty of rotor dynamic balance, and improving the bearing support stability and the reliability of rotor operation. In addition, an oil baffle is installed between the motor rotor and the bearing housing, allowing a small amount of lubricating oil to flow onto the surface of the motor rotor, preventing a large amount of lubricating oil from flowing between the motor rotor and the stator and deteriorating the motor performance, while strengthening the heat dissipation of the motor and improving the working life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 This is the overall structural schematic diagram of the embodiment of the present invention.

[0015] Explanation of reference numerals: 1. Compressor impeller; 2. Shaft end nut; 3. Shaft seal sleeve; 4. Thrust washer; 5. Oil baffle; 6. Thrust bearing plate; 7. Auxiliary bearing; 8. Bearing retaining ring; 9. Floating ring bearing; 10. Motor stator; 11. Motor rotor; 12. Bearing oil baffle; 13. Bearing housing; 14. Turbine rotating shaft; 15. Stator support seat; 16. Compressor back plate. Detailed implementation manners

[0016] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0017] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0019] The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0020] As Figure 1As shown in the figure, a motor-centered electric auxiliary supercharger rotor structure supported by a floating ring bearing includes a compressor impeller 1, a shaft end nut 2, a shaft seal sleeve 3, a thrust washer 4, an oil baffle 5, a thrust bearing plate 6, an auxiliary bearing 7, a bearing retaining ring 8, a floating ring bearing 9, a motor stator 10, a motor rotor 11, a bearing oil baffle 12, a bearing housing 13, a turbine rotating shaft 14, a stator support seat 15, and a compressor back plate 16. The floating ring bearing 9 includes a turbine-end floating ring bearing and a compressor-end floating ring bearing. The bearing oil baffle 12 includes a turbine-end bearing oil baffle and a compressor-end bearing oil baffle. The bearing housing 13 includes a turbine-end bearing housing and a compressor-end bearing housing. First, install the turbine-end floating ring bearing, the compressor-end floating ring bearing, the oil baffle 5, and the bearing oil baffle 12 into the turbine-end bearing housing and the compressor-end bearing housing respectively.

[0021] In a preferred embodiment of the present invention, the turbine rotating shaft 14 is inserted into the turbine-end floating ring bearing of the turbine-end bearing housing from the turbine end.

[0022] In a preferred embodiment of the present invention, on the basis of not changing the floating ring bearing support structure of the turbocharger, the motor rotor 11 is installed on the turbine rotating shaft 14, and the motor rotor 11 is located between the two floating ring bearings 9 and is relatively fixed to the turbine rotating shaft 14. During the operation of the supercharger, it rotates together with the supercharger rotor. After heating the motor rotor 11, it is inserted into the turbine rotating shaft 14, and the end face of the motor rotor 11 is pressed against the shaft shoulder.

[0023] In a preferred embodiment of the present invention, after the motor rotor 11 cools down and it is determined that it is locked with the turbine rotating shaft 14, the motor stator 10 is fixedly installed on the stator support seat 15.

[0024] In a preferred embodiment of the present invention, the compressor-end bearing housing is installed and fixed on the stator support seat 15 after passing through the turbine rotating shaft 14.

[0025] In a preferred embodiment of the present invention, the auxiliary bearing 7 is heated and then passed through the turbine rotating shaft 14 to ensure that the end face of the auxiliary bearing 7 is in close contact with the motor rotor 11.

[0026] In a preferred embodiment of the present invention, after the auxiliary bearing 7 cools down and it is determined that it is locked with the turbine rotating shaft 14, the thrust washer 4 is passed through the turbine rotating shaft 14 and is in close contact with the auxiliary bearing 7.

[0027] In a preferred embodiment of the present invention, the oil baffle 5 is passed through the turbine rotating shaft 14 and then pressed on the thrust bearing plate 6.

[0028] In a preferred embodiment of the present invention, the shaft seal sleeve 3 is passed through the center holes of the turbine rotating shaft 14 and the oil baffle 5 and then pressed on the thrust washer 4.

[0029] In a preferred embodiment of the present invention, the compressor back plate 16 is passed through the turbine rotating shaft 14 and the shaft seal sleeve 3 and then pressed tightly against the compressor end bearing seat, while ensuring that the compressor back plate 16 is pressed tightly against the oil baffle 5.

[0030] In a preferred embodiment of the present invention, two bearing oil baffles 12 are used to isolate between the motor rotor 11 and the two bearing seats 13, and a small amount of lubricating oil can flow through the gap between the two bearing oil baffles 12 and the turbine rotating shaft 14.

[0031] Advantages of the present invention: In the motor-centered electric auxiliary supercharging rotor structure supported by floating ring bearings, without changing the support mode of the floating ring bearings, the motor rotor is arranged between the two floating ring bearings, so as to ensure that the center of gravity of the rotor is located between the two supports of the rotor, increasing the stability of the floating ring bearing support, reducing the difficulty of rotor dynamic balance, and improving the bearing support stability and the reliability of rotor operation. In addition, an oil baffle is installed between the motor rotor and the bearing seat, allowing a small amount of lubricating oil to flow onto the surface of the motor rotor, preventing a large amount of lubricating oil from flowing between the motor rotor and the stator and deteriorating the motor performance, while enhancing the heat dissipation of the motor and improving the working life of the motor.

[0032] Installation process of a motor-centered electric auxiliary supercharging rotor structure supported by floating ring bearings: The compressor impeller 1 and the shaft end nut 2 are successively sleeved on the turbine rotating shaft 14, and the shaft end nut 2 is tightened to ensure that the compressor impeller 1 is pressed tightly against the shaft seal sleeve 3 and the shaft end nut 2 is pressed tightly against the compressor impeller 1, without relative rotation. Thus, the assembly of the motor-centered electric auxiliary supercharging rotor structure supported by floating ring bearings is completed.

[0033] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A floating ring bearing-supported motor-centered electric auxiliary supercharger rotor structure, characterized in that: It includes a compressor impeller (1), a shaft end nut (2), a shaft seal sleeve (3), a thrust washer (4), an auxiliary bearing (7), a floating ring bearing (9), a motor stator (10), a motor rotor (11) and a turbine rotating shaft (14). The turbine rotating shaft (14) is respectively installed with the compressor impeller (1). One end of the compressor impeller (1) is the compressor end, and the other end of the compressor impeller (1) is the turbine end. The turbine rotating shaft (14) passes through the compressor impeller (1) at the compressor end and is installed with a shaft end nut (2). One end of the turbine rotating shaft (14) near the compressor impeller (1) of the compressor end is successively installed with a shaft seal sleeve (3), a thrust washer (4), an auxiliary bearing (7) and a motor rotor (11) from left to right. The floating ring bearing (9) includes a turbine end floating ring bearing and a compressor end floating ring bearing. The compressor end floating ring bearing is installed outside the auxiliary bearing (7). One end of the turbine rotating shaft (14) near the compressor impeller (1) of the turbine end is installed with a turbine end floating ring bearing. The motor stator (10) is installed outside the motor rotor (11).

2. The motor center-mounted electric auxiliary supercharger rotor structure supported by a floating ring bearing according to claim 1, characterized in that: It also includes an oil baffle (5) and a thrust bearing plate (6). The oil baffle (5) is installed between the shaft seal sleeve (3) and the thrust washer (4). The thrust bearing plate (6) is installed between the thrust washer (4) and the auxiliary bearing (7), and the oil baffle (5) presses on the thrust bearing plate (6) after passing through the turbine rotating shaft (14).

3. The motor center-mounted electric auxiliary supercharger rotor structure supported by a floating ring bearing according to claim 1, wherein: It also includes a bearing retaining ring (8). The bearing retaining ring (8) is installed between the auxiliary bearing (7) and the compressor end floating ring bearing.

4. The structure of an electric motor central-mounted electric auxiliary supercharging rotor supported by a floating ring bearing according to claim 1, wherein: It also includes a bearing oil baffle (12) and a bearing housing (13). The bearing oil baffle (12) includes a turbine end bearing oil baffle and a compressor end bearing oil baffle. The bearing housing (13) includes a turbine end bearing housing and a compressor end bearing housing. The turbine end bearing oil baffle and the compressor end bearing oil baffle are respectively installed in the turbine end bearing housing and the compressor end bearing housing. The compressor end bearing housing passes through the turbine rotating shaft (14) and is installed on the stator support seat (15). The turbine rotating shaft (14) penetrates into the turbine end floating ring bearing of the turbine end bearing housing from the turbine end.

5. The structure of the motor-centered electric auxiliary supercharger rotor supported by a floating ring bearing according to claim 4, characterized in that: It also includes a stator support seat (15) and a compressor back plate (16). The stator support seat (15) is installed on the motor stator (10). The compressor back plate (16) passes through the turbine rotating shaft (14) and the shaft seal sleeve (3) and then presses tightly against the compressor end bearing housing, and at the same time ensures that the compressor back plate (16) is pressed tightly against the oil baffle (5).

6. The structure of the motor-centered electric auxiliary supercharger rotor supported by a floating ring bearing according to claim 1, wherein: The motor rotor (11) is located between the two floating ring bearings (9) and is relatively fixed to the turbine rotating shaft (14). It rotates together with the supercharger rotor during the operation of the supercharger. After heating the motor rotor (11), it is penetrated into the turbine rotating shaft (14), and the end face of the motor rotor (11) presses tightly against the shaft shoulder. After the motor rotor (11) cools down and is determined to be locked with the turbine rotating shaft (14), the motor stator (10) is fixedly installed on the stator support seat (15).

7. A motor-centered electric auxiliary supercharger rotor structure supported by a floating ring bearing, characterized in that: After heating the auxiliary bearing (7), it is passed through the turbine rotating shaft (14) and ensures that the end face of the auxiliary bearing (7) is in tight contact with the motor rotor (11). After the auxiliary bearing (7) cools down and is determined to be locked with the turbine rotating shaft (14), the thrust washer (4) is passed through the turbine rotating shaft (14) and is in tight contact with the auxiliary bearing (7).

8. The structure of the motor-centered electric auxiliary supercharger rotor supported by a floating ring bearing according to claim 1, wherein: Pass the shaft seal sleeve (3) through the central holes of the turbine rotating shaft (14) and the oil baffle (5), and then press it onto the thrust washer (4).

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