Bearing housing structure with gas inlet and gas outlet

Abstract

A bearing housing structure with an air inlet and an air outlet is provided. The bearing housing structure includes a first bearing housing and a second bearing housing located on both sides of a motor housing. The first bearing housing has an air inlet hole that connects to the motor cavity within the motor housing; the second bearing housing has an air outlet hole that also connects to the motor cavity within the motor housing. The air inlet hole is connected to a high-pressure air source. This invention provides a bearing housing structure with an air inlet and an air outlet, employing a high-pressure air circulation structure to ensure a high-pressure gas environment within the motor rotor cavity. This environment prevents lubricating oil from entering, while the circulating gas also carries away rotor heat, achieving the purpose of cooling the motor rotor.

Description

Technical Field

[0001] This utility model belongs to the field of electric booster technology, specifically relating to a bearing housing structure with an air inlet and an air outlet. Background Technology

[0002] A turbocharger is a device used to increase the intake pressure of an engine. It increases the intake density by compressing air or gas, thereby improving engine power and efficiency. An electric turbocharger is a type of turbocharger that uses an electric motor to drive a shaft and an impeller on the shaft to rotate.

[0003] In current electric supercharger structures, when a two-stage electric supercharger uses floating bearings to support the rotor shaft, a sealing ring separates the floating bearing lubrication chamber from the motor rotor chamber to prevent lubricating oil from entering the motor rotor chamber. However, due to gaps in the sealing ring, some lubricating oil can still enter the motor chamber during high-speed shaft rotation, leading to abnormal lubricating oil consumption and affecting normal motor operation. Furthermore, the high-speed rotation of the motor rotor generates heat, requiring heat dissipation.

[0004] Therefore, based on the above situation, this application further designs and improves the bearing housing structure in the electric turbocharger. Utility Model Content

[0005] To address the shortcomings of the existing technology, this utility model provides a bearing housing structure with an air inlet and an air outlet. The air inlet and outlet are combined using a high-pressure gas circulation structure to ensure a high-pressure gas environment in the motor rotor cavity, which can prevent lubricating oil from entering. At the same time, the circulating gas can also carry away the rotor heat, thereby achieving the purpose of cooling the motor rotor.

[0006] The present invention is solved by the following technical solution.

[0007] A bearing housing structure with an air inlet and an air outlet includes a first bearing housing and a second bearing housing located on both sides of a motor housing. The first bearing housing has an air inlet that connects to the motor cavity within the motor housing; the second bearing housing has an air outlet that also connects to the motor cavity within the motor housing. The air inlet is connected to a high-pressure air source. In this structure, the high-pressure air source enters the motor cavity to create a high-pressure environment, which can prevent the ingress of lubricating oil. Simultaneously, the gas circulation can remove heat, achieving a gas cooling function.

[0008] In a preferred embodiment, the first bearing housing has a through hole for the shaft to pass through, and a first floating bearing is provided at the through hole, with a sealing ring provided on the inner side of the first floating bearing.

[0009] In a preferred embodiment, the second bearing housing has a through hole for the shaft to pass through, and a second floating bearing is provided at the through hole, with a sealing ring provided on the inner side of the second floating bearing.

[0010] In a preferred embodiment, the compressor outlet pipe of the turbocharger is provided with an air intake port, and the air inlet is connected to the air intake port through a pipe to obtain high-pressure gas.

[0011] In a preferred embodiment, a pressure control valve is provided in the pipeline between the air intake port and the air inlet. The pressure control valve controls the intake pressure to ≤1.5 bar. Combined with the function of the sealing ring in the bearing housing, it can prevent a large amount of gas from entering the oil chamber. A small amount of gas can enter the engine housing through the oil return pipe and then be discharged through the torsion pipe.

[0012] Compared with the prior art, the present invention has the following beneficial effects: it provides a bearing housing structure with an air inlet and an air outlet, wherein the air inlet and the air outlet are combined with a high-pressure gas circulation structure to ensure a high-pressure gas environment in the motor rotor cavity, which can prevent lubricating oil from entering, and the circulating gas can also carry away the rotor heat to achieve the purpose of cooling the motor rotor. Attached Figure Description

[0013] Figure 1 This is a perspective view of the electric booster in this utility model.

[0014] Figure 2 A cross-sectional view of the electric booster in this utility model. Figure 1 .

[0015] Figure 3 A cross-sectional view of the electric booster in this utility model. Figure 2 .

[0016] Figure 4 A cross-sectional view of the electric booster in this utility model. Figure 3 .

[0017] Figure 5 This is a perspective view of the first bearing housing in this utility model.

[0018] Figure 6 This is a perspective view of the second bearing housing in this utility model. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] In the following embodiments, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this utility model, it should be understood that the terms such as center, longitudinal, transverse, length, width, thickness, upper, lower, front, back, left, right, vertical, horizontal, top, bottom, inner, outer, clockwise, and counterclockwise, indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features shown. In the description of this utility model, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] See Figures 1 to 6 The present invention relates to an electric supercharger and its bearing housing structure, the specific structure of which is as follows.

[0023] The electric supercharger includes a motor housing 1, with a first bearing housing 2 and a second bearing housing 3 on both sides of the motor housing 1. The motor housing 1 contains a motor cavity, which houses a stator 11 and a rotor 12. The rotating shaft 12 is located on a rotating shaft 8, with both ends of the rotating shaft 8 passing through the motor housing 1 and then through the first bearing housing 2 and the second bearing housing 3, respectively. The first bearing housing 2 contains a first floating bearing 21 fitted onto the rotating shaft 8 and a corresponding first lubricating oil cavity 22. A sealing ring 7 is provided on the inner side of the first floating bearing 21. The second bearing housing 3 contains a second floating bearing 31 fitted onto the rotating shaft 8 and a corresponding second lubricating oil cavity 32. A sealing ring 7 is provided on the inner side of the second floating bearing 31.

[0024] In this application, the first bearing housing 2 is provided with an air inlet 27 and connected to the motor cavity; the second bearing housing 3 is provided with an air outlet 37 and connected to the motor cavity; high-pressure gas flows into the air inlet 27.

[0025] Furthermore, in this application, an air intake port is provided on the compressor outlet pipe, and the air inlet 27 is connected to this air intake port through a pipe to obtain high-pressure gas, ensuring a high-pressure environment in the motor cavity. A pressure control valve is provided in the pipe between the air intake port and the air inlet 27. This pressure control valve controls the intake pressure to ≤1.5 bar. Combined with the function of the sealing ring inside the bearing housing, it can prevent a large amount of gas from entering the oil chamber. A small amount of gas can enter the engine housing through the return oil pipe and then be discharged through the bend pipe. In addition, the pressurized gas is introduced into the motor rotor cavity from the motor air intake port, thereby forming a high-pressure cavity in the motor rotor cavity, preventing lubricating oil from entering the motor rotor cavity. At the same time, as the gas flows in the rotor cavity, it can carry away the heat inside the motor stator, avoiding the motor power being limited by temperature.

[0026] During operation, the electric supercharger can reach 10W rpm / min from a standstill within seconds, at which point the pressure ratio can be as low as 1.3, and the internal pressure of the compressor can reach approximately 130 kPa. At this point, only a small amount of splashed lubricating oil accumulates at the sealing ring in the oil chamber. Because the pressure inside the lubricating oil chamber is lower than the gas pressure inside the motor rotor chamber (the normal pressure of lubricating oil in the oil chamber is -3 to 4 kPa), the gas, under the action of the pressure difference, pushes the accumulated lubricating oil at the sealing ring back into the lubricating oil chamber, preventing lubricating oil leakage. By combining air pressure and the sealing ring, the entry of lubricating oil into the motor chamber can be essentially prevented during the operation of the electric supercharger, thus avoiding abnormal lubricating oil consumption. Since no lubricating oil enters the motor chamber during motor operation, the motor safety is higher when a high-voltage platform (such as an 800V voltage platform) is used.

[0027] In this application, the air inlet 27 and the air outlet 37 are located on both sides of the motor stator. During the gas flow process, the high temperature inside the motor stator can be carried away, reducing the motor stator temperature. As the motor speed increases, the stator temperature increases, and the compressor end pressure further increases, which can simultaneously improve the air cooling efficiency.

[0028] As can be seen from the above description, this utility model provides a bearing housing structure with an air inlet and an air outlet. The air inlet and the air outlet are combined with a high-pressure gas circulation structure to ensure a high-pressure gas environment in the motor rotor cavity, which can prevent lubricating oil from entering. At the same time, the circulating gas can also carry away the rotor heat, thereby achieving the purpose of cooling the motor rotor.

[0029] The scope of protection of this utility model includes, but is not limited to, the above embodiments. The scope of protection of this utility model is defined by the claims. Any substitutions, modifications, or improvements to this technology that are easily conceived by those skilled in the art shall fall within the scope of protection of this utility model.

Claims

1. A bearing housing structure having an air inlet and an air outlet, the bearing housing structure comprising a first bearing housing (2) and a second bearing housing (3) disposed on both sides of a motor housing (1), characterized in that: The first bearing housing (2) is provided with an air inlet (27), which is connected to the motor cavity in the motor housing (1); The second bearing housing (3) is provided with an air outlet (37), which is connected to the motor cavity in the motor housing (1); The air inlet (27) is connected to a high-pressure air source.

2. The bearing housing structure with an air inlet and an air outlet according to claim 1, characterized in that, The first bearing housing (2) has a through hole through which the rotating shaft (8) passes, and a first floating bearing (21) is provided at the through hole. A sealing ring (7) is provided on the inner side of the first floating bearing (21).

3. The bearing housing structure with an air inlet and an air outlet according to claim 1, characterized in that, The second bearing housing (3) has a through hole through which the rotating shaft (8) passes, and a second floating bearing (31) is provided at the through hole. A sealing ring (7) is provided on the inner side of the second floating bearing (31).

4. The bearing housing structure having an air inlet and an air outlet according to any one of claims 1 to 3, characterized in that, The compressor outlet pipe of the booster is provided with an air intake port, and the air inlet (27) is connected to the air intake port through a pipe to obtain high-pressure gas.

5. The bearing housing structure with an air inlet and an air outlet according to claim 4, characterized in that, A pressure control valve is provided in the pipeline between the air intake port and the air inlet (27), which controls the air intake pressure to ≤1.5 bar.

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