Electric supercharger with oil leakage prevention and cooling structure

Abstract

The electric supercharger with the oil leakage prevention and cooling structure comprises a motor shell, and a first bearing shell and a second bearing shell are arranged on the two sides of the motor shell respectively; a motor cavity is formed in the motor shell, a stator and a rotor are arranged in the motor cavity, the rotating shaft is located on the rotating shaft, and the two ends of the rotating shaft penetrate through the motor shell and then penetrate through the first bearing shell and the second bearing shell respectively; a first floating bearing is arranged in the first bearing shell, and a sealing ring is arranged on the inner side of the first floating bearing; a second floating bearing is arranged in the second bearing shell, and a sealing ring is arranged on the inner side of the second floating bearing; any structure of the motor shell, the first bearing shell and the second bearing shell is provided with an air inlet hole and an air outlet hole; and high-pressure gas flows into the gas inlet hole. A high-pressure gas circulation structure is adopted, the high-pressure gas environment in the motor rotor cavity is guaranteed, lubricating oil can be prevented from entering, meanwhile, circulating gas can take away rotor heat, and the purpose of cooling the motor rotor is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric superchargers, and in particular relates to an electric supercharger with an oil leakage prevention and cooling structure. Background Art

[0002] A supercharger is a device used to increase the intake pressure of an engine by compressing air or gas to increase the intake density, thereby improving engine power and efficiency. Examples include turbochargers and electric superchargers used in automobiles.

[0003] In current electric supercharger designs, two-stage electric superchargers use floating bearings to support the rotating shaft. A sealing ring separates the floating bearing's lubricating oil chamber from the motor's rotor chamber, preventing lubricating oil from entering the 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.

[0004] In addition, there is a water cavity on the outside of the motor stator for cooling, but the area between it and the rotor cannot be cooled. Under high load, the motor power may be limited due to excessive temperature.

[0005] Therefore, based on the above situation, the present application further designs and improves the relevant structures in the electric supercharger. Summary of the Invention

[0006] In response to the above deficiencies in the prior art, the present invention provides an electric supercharger with an anti-oil leakage and cooling structure. It adopts 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 take away the heat of the rotor, thereby achieving the purpose of cooling the motor rotor.

[0007] The present invention is solved by the following technical solutions.

[0008] An electric supercharger with an oil leakage prevention and cooling structure includes a motor housing, with a first bearing housing and a second bearing housing provided on both sides of the motor housing respectively; a motor cavity is provided in the motor housing, with a stator and a rotor provided in the motor cavity, the rotating shaft is located on the rotating shaft, and both ends of the rotating shaft pass through the motor housing and then through the first bearing housing and the second bearing housing respectively; the first bearing housing is provided with a first floating bearing sleeved on the rotating shaft and a corresponding first lubricating oil chamber, and a sealing ring is provided on the inner side of the first floating bearing; the second bearing housing is provided with a second floating bearing sleeved on the rotating shaft and a corresponding second lubricating oil chamber, and a sealing ring is provided on the inner side of the second floating bearing; any one of the motor housing, the first bearing housing, and the second bearing housing is provided with an air inlet and an air outlet; high-pressure gas flows into the air inlet.

[0009] In a preferred embodiment, an air intake port is provided on the compressor outlet pipeline, and the air inlet is connected to the air intake port through a pipeline to obtain high-pressure gas, thereby ensuring a high-pressure environment in the motor cavity.

[0010] In a preferred embodiment, a pressure control valve is provided in the pipeline between the air intake and the air inlet. The pressure control valve controls the air intake pressure to ≤1.5 bar. Combined with the effect 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 return oil pipe and be discharged through the curved pipe.

[0011] In a preferred embodiment, the air inlet is provided on the first bearing housing and is connected to the motor cavity; the air outlet is provided on the second bearing housing and is connected to the motor cavity.

[0012] Compared with the prior art, the present invention has the following beneficial effects: it provides an electric supercharger with an anti-oil leakage and cooling structure, adopts 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 at the same time the circulating gas can also take away the heat of the rotor, thereby achieving the purpose of cooling the motor rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The three-dimensional diagram of the electric supercharger in the present invention Figure 1 .

[0014] Figure 2 The three-dimensional diagram of the electric supercharger in the present invention Figure 2 .

[0015] Figure 3 A cross-sectional view of the electric supercharger of the present invention Figure 1 .

[0016] Figure 4 A cross-sectional view of the electric supercharger of the present invention Figure 2 .

[0017] Figure 5 A cross-sectional view of the electric supercharger of the present invention Figure 3 .

[0018] Figure 6 It is a three-dimensional view of the first bearing housing in the present invention.

[0019] Figure 7 It is a three-dimensional view of the second bearing housing in the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] In the following embodiments, the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. 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 understood as limiting the present invention.

[0022] In the description of the present invention, it should be understood that the terms: center, longitudinal, transverse, length, width, thickness, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and therefore cannot be understood as limiting 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 number of technical features shown. In the description of the present invention, unless otherwise clearly specified and limited, the terms: install, connect, connect, etc. should be understood in a broad sense, and ordinary technicians in this field can understand the specific meanings of the above terms in this application according to the specific circumstances.

[0023] See also Figures 1 to 7 The present invention relates to an electric supercharger with an oil leakage prevention and cooling structure, comprising a motor housing 1, with a first bearing housing 2 and a second bearing housing 3 provided on either side of the motor housing 1. The motor housing 1 includes a motor cavity, in which a stator 11 and a rotor 12 are provided. The rotating shaft 12 is located on a rotating shaft 8, and both ends of the rotating shaft 8 pass 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 includes a first floating bearing 21 and a corresponding first lubricating oil chamber 22, which are sleeved on the rotating shaft 8. A sealing ring 7 is provided on the inner side of the first floating bearing 21. The second bearing housing 3 includes a second floating bearing 31 and a corresponding second lubricating oil chamber 32, which are sleeved on the rotating shaft 8. A sealing ring 7 is provided on the inner side of the second floating bearing 31. An air inlet 27 and an air outlet 37 are provided on any of the motor housing 1, the first bearing housing 2, and the second bearing housing 3. High-pressure gas flows into the air inlet 27.

[0024] Specifically, in this application, an air intake is provided on the compressor outlet pipeline. The air inlet 27 is connected to this intake via a pipeline to obtain high-pressure gas, thus maintaining a high-pressure environment in the motor cavity. A pressure control valve is installed in the pipeline between the air intake and air inlet 27. This pressure control valve controls the intake pressure to ≤1.5 bar. Combined with the sealing ring in the bearing housing, this valve prevents large amounts of gas from entering the oil chamber. A small amount of gas can enter the engine housing through the oil return pipe and be discharged through the curved pipe.

[0025] In addition, in the present application, the air inlet 27 is provided on the first bearing housing 2 and is connected to the motor cavity; the air outlet 37 is provided on the second bearing housing 3 and is connected to the motor cavity.

[0026] Specifically, the technical solution of the present invention adds an air inlet 27 and an air outlet 37 to the bearing housing and / or the motor housing, and adds an air intake to the outlet pipe of the first-stage compressor, and adds a pressure control valve between the air intake and the motor air inlet to control the intake pressure at ≤1.5 bar, and introduce the pressurized gas from the motor air inlet into the motor rotor cavity, thereby forming a high-pressure cavity in the motor rotor cavity to prevent lubricating oil from entering the motor rotor cavity. At the same time, since the gas flows in the rotor cavity, it can take away the temperature inside the motor stator, thereby avoiding the motor power being limited due to temperature.

[0027] During operation, an electric supercharger can reach 10W rpm / min from a standstill in a matter of seconds, with a compression ratio as low as 1.3. The internal compressor pressure can reach approximately 130kPa, causing only a small amount of splashing lubricant to accumulate at the sealing ring in the oil chamber. Because the pressure in the lubricant chamber is lower than the gas pressure in the motor rotor chamber (normally, the lubricant pressure in the oil chamber is -3 to 4kPa), the gas pressure differential pushes the accumulated lubricant at the sealing ring back into the lubricant chamber, preventing leakage. This combination of air pressure and sealing rings essentially isolates lubricant from entering the motor chamber during operation, thus preventing abnormal lubricant consumption. Since no lubricant enters the motor chamber during operation, the motor is safer when operating on a high-voltage platform (such as an 800V platform).

[0028] The air inlet 27 and the air outlet 37 are respectively located on both sides of the motor stator. During the gas flow process, the high temperature inside the motor stator can be taken away, thereby reducing the temperature of the motor stator. As the motor speed increases, the stator temperature increases and the compressor end pressure further increases, which can simultaneously improve the air cooling efficiency.

[0029] As can be seen from the above description, the present invention provides an electric supercharger with an anti-oil leakage and cooling structure, which adopts a high-pressure gas circulation structure to ensure a high-pressure gas environment in the motor rotor cavity, which can prevent the entry of lubricating oil. At the same time, the circulating gas can also take away the heat of the rotor, thereby achieving the purpose of cooling the motor rotor.

[0030] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention is based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by those skilled in the art fall within the protection scope of the present invention.

Claims

1. An electric supercharger with an oil leakage prevention and cooling structure, comprising a motor housing (1), wherein a first bearing housing (2) and a second bearing housing (3) are respectively provided on both sides of the motor housing (1); A motor cavity is provided in the motor housing (1), a stator (11) and a rotor (12) are provided in the motor cavity, the rotating shaft (12) is located on the rotating shaft (8), and both ends of the rotating shaft (8) pass through the motor housing (1) and then pass through the first bearing housing (2) and the second bearing housing (3) respectively; Its characteristics are: The first bearing housing (2) is provided with a first floating bearing (21) sleeved on the rotating shaft (8) and a corresponding first lubricating oil chamber (22), and a sealing ring (7) is provided on the inner side of the first floating bearing (21); The second bearing housing (3) is provided with a second floating bearing (31) sleeved on the rotating shaft (8) and a corresponding second lubricating oil chamber (32), and a sealing ring (7) is provided on the inner side of the second floating bearing (31); An air inlet (27) and an air outlet (37) are provided on any one of the motor housing (1), the first bearing housing (2), and the second bearing housing (3); high-pressure gas flows into the air inlet (27).

2. The electric supercharger with oil leakage prevention and cooling structure according to claim 1, characterized in that: An air intake port is provided on the compressor outlet pipeline, and the air inlet (27) is connected to the air intake port via a pipeline to obtain high-pressure gas.

3. The electric supercharger with oil leakage prevention and cooling structure according to claim 2, characterized in that: A pressure control valve is provided in the pipeline between the air intake port and the air inlet hole (27), and the pressure control valve controls the air inlet pressure to ≤1.5 bar.

4. The electric supercharger with oil leakage prevention and cooling structure according to claim 2, characterized in that: The air inlet (27) is provided on the first bearing housing (2) and is connected to the motor cavity; the air outlet (37) is provided on the second bearing housing (3) and is connected to the motor cavity.

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