An electric compressor

Abstract

An electric compressor comprises a compressor shell, one side of the compressor shell is provided with a compressor cover plate, and the other side of the compressor shell is provided with an air flow pipe; a motor assembly is arranged in the compressor shell, an electric control assembly chamber is formed between the compressor cover plate and the compressor shell, and an electric control assembly is arranged in the electric control assembly chamber; the electric control assembly chamber and the motor assembly chamber are isolated and cooled by a cooling structure; the cooling structure is arranged in the compressor shell, and the cooling structure comprises an electric control assembly cooling cavity arranged on the inner side of the electric control assembly chamber and a motor assembly cooling cavity arranged on the outer periphery of the motor assembly chamber. The electric compressor in the application adopts a set of cooling structure to cool the electric control assembly and the motor assembly, so that the whole can adopt a casting process, the cost is obviously reduced, and the structure is compact.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of turbocharging, and particularly relates to an electric compressor. BACKGROUND

[0002] Turbocharging technology is widely used in automobiles, wherein a traditional turbocharger utilizes heat energy, kinetic energy, pressure energy and the like in exhaust gas discharged when an engine is working to drive a turbine in a turbine box, and the turbine drives a coaxial impeller to form a rotor assembly, and the impeller compresses air sent by an air filter pipeline to make the air enter an engine combustion chamber after being pressurized.

[0003] At present, electric supercharging technology also begins to appear, and an electric compressor is a representative thereof, and the electric compressor rotates a compressor impeller by a motor to realize pressurization of gas and achieve a supercharging effect. The electric compressor generally comprises a shell, an electric control assembly, a motor assembly, an impeller assembly and the like, wherein the electric control assembly and the motor assembly both generate heat in a working process, and the heat generation is greater when working under high load. Therefore, a professional cooling assembly needs to be matched to ensure efficient and durable operation of the electric compressor. At present, two sets of cooling structures for cooling the electric control assembly and the motor assembly are adopted, which leads to complex structure and high cost.

[0004] In addition, the volume of the electric compressor needs to be compact and small due to the limited installation space in a vehicle, and the volume of some electric compressors in the prior art is still large, which is not conducive to market promotion.

[0005] Therefore, based on the above status, the electric compressor is further designed and improved in the application. SUMMARY

[0006] In view of the deficiencies in the prior art, the application provides an electric compressor, wherein a cooling structure is optimized and designed, one set of cooling structure is adopted to cool the electric control assembly and the motor assembly, cooling is improved, and the cooling effect is good. In addition, the structure and flow channel design of the overall electric compressor are more reasonable and compact.

[0007] The application is solved by the following technical scheme.

[0008] An electric compressor comprises a compressor shell, a compressor cover plate arranged on one side of the compressor shell, and an airflow duct arranged on the other side of the compressor shell; a motor assembly is arranged in the compressor shell; an electric control assembly chamber is formed between the compressor cover plate and the compressor shell, and an electric control assembly is arranged in the electric control assembly chamber; a rear cover plate is arranged on the side of the compressor shell away from the compressor cover plate, and a motor assembly chamber is formed between the rear cover plate and the inner cavity of the compressor shell, and a motor assembly is arranged in the motor assembly chamber, and the rotating shaft of the motor assembly is connected to an impeller through the rear cover plate, and the impeller is used for compressing gas into the airflow duct; the electric control assembly chamber and the motor assembly chamber are isolated and cooled by a cooling structure; the cooling structure is arranged in the compressor shell, and the cooling structure comprises an electric control assembly cooling cavity arranged on the inner side of the electric control assembly chamber and a motor assembly cooling cavity arranged on the outer periphery of the motor assembly chamber; after entering the compressor shell, the cooling liquid flows out through the electric control assembly cooling cavity and the motor assembly cooling cavity in sequence, or flows out through the motor assembly cooling cavity and the electric control assembly cooling cavity in sequence.

[0009] The electric compressor in the application adopts a set of cooling structure to cool the electric control assembly and the motor assembly, so that the whole can be produced by casting process, and the cost is obviously reduced, and the structure is compact.

[0010] In a preferred embodiment, one side of the electric control assembly cooling cavity is provided with a sealing plate for sealing, and an electric control unit is arranged on the side of the sealing plate facing the electric control assembly chamber; specifically, the electric control unit can be arranged on an electric control board which is tightly attached to the sealing plate, so that the heat generated by the electric control board can be quickly transferred to the sealing plate, and the inner side of the sealing plate is the inner wall of the electric control assembly cooling cavity and is in contact with the cooling liquid, so that a good cooling effect can be achieved and the stable operation of the electric control assembly is ensured.

[0011] In a preferred embodiment, the sealing plate extends a plurality of heat-conducting strips on the side facing the electric control assembly cooling cavity, which can significantly improve the heat dissipation effect.

[0012] In a preferred embodiment, the electric control assembly cooling cavity is a curved strip structure, and a cooling liquid inlet and a cooling liquid outlet are arranged at the two ends of the electric control assembly cooling cavity respectively.

[0013] In a preferred embodiment, the motor assembly cooling cavities are arranged in the interlayer of the side wall of the compressor shell, and the compressor shell can be produced by integral casting, so that the cost is low and the sealing performance is good.

[0014] In a preferred embodiment, a partition is arranged in the interlayer space of the side wall of the compressor shell, and the partition is used for forming a bent channel for the motor assembly cooling cavities, increasing the flow path of the cooling liquid, and improving the cooling effect of the motor assembly.

[0015] In a preferred embodiment, the cooling liquid first passes through the electric control assembly cooling cavity, and then passes through the motor assembly cooling cavity before flowing out; the position where the cooling liquid from the outlet of the electric control assembly cooling cavity enters the motor assembly cooling cavity is at the bending position of the channel, and the cooling liquid is divided into two paths to flow in the interlayer space, and finally converges and flows out. This structure can efficiently cool, avoid overheating of the cooling liquid at the end of the flow channel, and ensure good cooling effect.

[0016] In a preferred embodiment, the angle a between the gas inlet direction of the airflow pipe and the horizontal direction is 20°-25°. This structure can make the spiral airflow pipe structure more compact, and the spiral effect is more compact than the traditional one, which helps to reduce the overall volume.

[0017] In a preferred embodiment, the inner side of the impeller has a concave portion in the axial direction, and the depth h of the concave portion is 1 / 12-1 / 8 of the outer diameter h0 of the impeller, preferably 1 / 10. This structure can reduce the axial length and help to reduce the overall volume.

[0018] In a preferred embodiment, the rear cover plate is provided with a protruding structure at the position of the concave portion, and the shaft passes through the position of the protruding structure and is provided with a bearing and a shaft seal sleeve, which functions as rotation and sealing.

[0019] Compared with the prior art, the present application has the following beneficial effects: an electric air compressor is provided, the cooling structure is optimized and designed, a set of cooling structure is used to cool the electric control assembly and the motor assembly, the cooling is improved, and the cooling effect is good; in addition, the structure and flow channel design of the overall electric air compressor are more reasonable and compact. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a perspective view of the electric air compressor in the present application Figure 1 .

[0021] Figure 2 is a perspective view of the electric air compressor in the present application Figure 2 .

[0022] Figure 3 is a schematic view of the electric air compressor in the present application Figure 1 .

[0023] Figure 4 is a flow direction schematic view of the airflow pipe in the present application Figure 3 .

[0024] Figure 5 is a schematic view of the electric air compressor in the present application Figure 2 .

[0025] Figure 6 is aFigure 5 Cross-sectional view in the direction of B-B.

[0026] Figure 7 For Figure 6 Enlarged view of region A.

[0027] Figure 8 For the schematic view at the impeller structure.

[0028] Figure 9 For the perspective view of the compressor casing in the electric compressor in the present invention Figure 1 .

[0029] Figure 10 For the perspective view of the compressor casing in the electric compressor in the present invention Figure 2 .

[0030] Figure 11 For the perspective view of the electric compressor omitting the compressor casing.

[0031] Figure 12 For the perspective view of the flow channel cavity in the cooling structure in the present invention Figure 1 .

[0032] Figure 13 For the perspective view of the flow channel cavity in the cooling structure in the present invention Figure 2 . DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the specific embodiments and the accompanying drawings.

[0034] In the following embodiments, the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout the description, and the following embodiments described by referring to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] In the description of the present invention, it should be understood that the terms: center, longitudinal, transverse, length, width, thickness, upper, lower, front, rear, left, right, vertical, horizontal, top, bottom, inner, outer, clockwise, counterclockwise, etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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 for the purpose of description, 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 explicitly specified and limited, the terms: mounting, connecting, connecting, etc. should be understood in a broad sense, and those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0036] Referring to Figures 1 to 13The electric compressor comprises a compressor shell 2, a compressor cover plate 1 arranged on one side of the compressor shell 2, and an airflow duct 8 arranged on the other side of the compressor shell 2; a motor assembly 3 is arranged in the compressor shell 2, and an electric control assembly chamber 20 is formed between the compressor cover plate 1 and the compressor shell 2, wherein an electric control assembly is arranged in the electric control assembly chamber 20; a rear cover plate 34 is arranged on the side of the compressor shell 2 away from the compressor cover plate 1, and a motor assembly chamber is formed between the rear cover plate 34 and the inner cavity of the compressor shell 2, wherein the motor assembly 3 is arranged in the motor assembly chamber, and the rotating shaft 31 of the motor assembly 3 is connected to an impeller 4 through the rear cover plate 34, and the impeller 4 is used for compressing gas into the airflow duct 8; the electric control assembly chamber 20 and the motor assembly chamber are isolated and cooled by a cooling structure; the cooling structure is arranged in the compressor shell 2, and the cooling structure comprises an electric control assembly cooling cavity 63 arranged on the inner side of the electric control assembly chamber 20 and a motor assembly cooling cavity 65 arranged on the outer periphery of the motor assembly chamber; after the cooling liquid enters the compressor shell 2, the cooling liquid flows out through the electric control assembly cooling cavity 63 and the motor assembly cooling cavity 65 in sequence or flows out through the motor assembly cooling cavity 65 and the electric control assembly cooling cavity 63 in sequence.

[0037] Specifically, one side of the electric control assembly cooling cavity 63 is provided with a sealing plate 11 for sealing, and an electric control unit is arranged on the side of the sealing plate 11 facing the electric control assembly chamber 20; specifically, the electric control unit can be arranged on an electric control board which is closely attached to the sealing plate 11, so that the heat generated by the electric control board can be quickly transferred to the sealing plate 11, and the inner side of the sealing plate 11 is the inner wall of the electric control assembly cooling cavity 63 and is in contact with the cooling liquid, so that a good cooling effect can be achieved and the stable operation of the electric control assembly can be ensured. Further, a plurality of heat-conducting strips 111 are protruded from the side of the sealing plate 11 facing the electric control assembly cooling cavity 63, which can significantly improve the heat dissipation effect.

[0038] In the application, the electric control assembly cooling cavity 63 is a curved strip structure, and cooling liquid inlets and outlets are arranged at two ends of the electric control assembly cooling cavity 63.

[0039] As can be seen from the drawings, in the application, the motor assembly cooling cavity 65 is distributed in the interlayer of the side wall of the compressor shell 2 and can be produced by integral casting, so that the cost is low and the sealing performance is good. In a further embodiment, a partition 659 is arranged in the interlayer space of the side wall of the compressor shell 2, and the partition 659 is used for forming a bent channel of the motor assembly cooling cavity 65, increasing the flow path of the cooling liquid and improving the cooling effect of the motor assembly 3. In the application, the axial partition 659 has two functions: 1. The cooling liquid channel is divided and forms a labyrinth waterway as a whole, so that the cooling effect is improved; and 2. The axial partition 659 facilitates casting, so that the motor shell can be made by casting process, and the cost is reduced.

[0040] In addition, in an embodiment of the application, the cooling liquid first flows through the electric control assembly cooling cavity 63, and then flows out through the motor assembly cooling cavity 65; the position where the cooling liquid from the outlet of the electric control assembly cooling cavity 63 enters the motor assembly cooling cavity 65 is at the bending position of the channel, and the cooling liquid is divided into two paths to flow in the interlayer space, and finally converges to flow out, which can efficiently cool and avoid overheating of the cooling liquid at the end of the flow channel, and ensure good cooling effect.

[0041] As can be seen from the drawings, in the electric compressor of the application, the included angle a between the gas inlet direction of the airflow duct 8 and the horizontal direction is 20°-25°, which can make the structure of the spiral airflow duct 8 more compact, and the spiral effect is more compact than the traditional one, which helps to reduce the overall volume.

[0042] In addition, in the electric compressor of the application, the inner side of the impeller 4 has a concave part in the axial direction, the depth h of the concave part is 1 / 12-1 / 8 of the outer diameter h0 of the impeller, preferably 1 / 10, which can reduce the axial length and help to reduce the overall volume. The rear cover plate 34 is provided with a protruding structure at the position of the concave part, and the shaft 31 is provided with a bearing 33 and a shaft seal sleeve 32 at the position through the protruding structure, which functions as rotation and sealing. The improvement of the structure maximizes the reduction of the axial length of the entire motor rotor under the condition of ensuring the strength of the impeller, makes the structure compact, and improves the stability of the rotor.

[0043] The following will be described in detail in combination with the drawings, especially the drawings Figure 12 and the drawings Figure 13 , an embodiment of the application is described in detail. As can be seen from the drawings, in the embodiment, the cooling liquid is water, the water inlet pipe 22 and the water outlet pipe 27 are provided on the outer wall of the compressor housing 2, the water inlet pipe 22 is close to one side of the electric control assembly, after water inlet, the cooling water flows into the electric control assembly cooling cavity 63 through the flow channel to cool the electric control assembly, and then flows into the motor assembly cooling cavity 65 through the through hole on the other side of the electric control assembly cooling cavity 63, at this time, the cooling liquid is divided into two paths, one path through the channel one 65a, and the other path through the bending part 67 and then through the channel two 65b, the two-way flow of the two paths of cooling liquid cools, and finally converges at the outlet 66, flows out through the water outlet pipe 27, as shown in detail in the drawings Figure 12 and the drawings Figure 13 , the structure formed by the flow of the cooling liquid is not a physical structure. Figure 12 Figure 13

[0044] ​​The electric compressor in the application adopts a cooling structure to cool the electric control assembly and the motor assembly, and the compressor housing 2 in the application integrates the motor assembly chamber, the electric control assembly chamber, the motor assembly cooling cavity and the electric control assembly cooling cavity, and is integrally formed by casting process, having the characteristics of low cost and compact structure. The motor stator, the rotating shaft and the rotor bearing system (which can be the conventional structure in the prior art) are fixed in the motor assembly chamber, and the electric control assembly is installed in the electric control assembly chamber. The heating elements of the electric control assembly are in contact with the sealing plate 11 through the heat-conducting silica gel, thereby enhancing the cooling effect of the electric control assembly. The inlet and outlet water pipes are installed on the compressor housing 2 through press fitting process, thereby optimizing the flow passage of the compressor housing and reducing the axial size of the flow passage of the compressor housing.

[0045] The above describes that the application provides an electric compressor, the cooling structure of which is optimized and designed, a cooling structure is adopted to cool the electric control assembly and the motor assembly, the cooling is improved, and the cooling effect is good. In addition, the structure and flow passage design of the overall electric compressor are more reasonable and compact.

[0046] The protection scope of the application includes but is not limited to the above embodiments, and the protection scope of the application is subject to the claims, and any replacement, deformation and improvement of the application which can be easily thought by those skilled in the art falls within the protection scope of the application.

Claims

1. An electric compressor, comprising a compressor housing (2), one side of the compressor housing (2) being provided with a compressor cover plate (1), the other side of the compressor housing (2) being provided with an airflow duct (8); a motor assembly (3) being arranged in the compressor housing (2), characterized in that: an electric control assembly chamber (20) is formed between the compressor cover plate (1) and the compressor housing (2), and an electric control assembly is arranged in the electric control assembly chamber (20); a rear cover plate (34) is arranged on the side of the compressor housing (2) away from the compressor cover plate (1), an electric motor assembly chamber is formed between the rear cover plate (34) and the internal cavity of the compressor housing (2), and the electric motor assembly (3) is arranged in the electric motor assembly chamber, a rotating shaft (31) of the electric motor assembly (3) penetrates through the rear cover plate (34) and is connected to an impeller (4), and the impeller (4) is used for compressing gas into the airflow duct (8); the electric control assembly chamber (20) and the electric motor assembly chamber are isolated and cooled by a cooling structure; the cooling structure is arranged in the compressor housing (2) and comprises an electric control assembly cooling cavity (63) arranged on the inner side of the electric control assembly chamber (20) and an electric motor assembly cooling cavity (65) arranged on the outer periphery of the electric motor assembly chamber, and after entering the compressor housing (2), the cooling liquid flows out in sequence through the electric control assembly cooling cavity (63) and the electric motor assembly cooling cavity (65) or in sequence through the electric motor assembly cooling cavity (65) and the electric control assembly cooling cavity (63); one side of the electric control assembly cooling cavity (63) is provided with a sealing plate (11) for sealing, and an electric control unit is arranged on the side of the sealing plate (11) facing the electric control assembly chamber (20); a plurality of heat-conducting strips (111) are arranged on the side of the sealing plate (11) facing the electric control assembly cooling cavity (63); the electric control assembly cooling cavity (63) is a curved strip structure, and cooling liquid inlets and outlets are arranged at two ends of the electric control assembly cooling cavity (63), respectively; the electric motor assembly cooling cavity (65) is distributed in the interlayer of the side wall of the compressor housing (2); a partition (659) is arranged in the interlayer space of the side wall of the compressor housing (2), and the partition (659) is used for forming a curved channel for the electric motor assembly cooling cavity (65); an included angle a between the gas entering direction of the airflow duct (8) and the horizontal direction is 20°-25°; the inside of the impeller (4) has a concave portion in the axial direction, and the depth h of the concave portion is 1 / 12-1 / 8 of the outer diameter h0 of the impeller.

2. An electric motor-driven supercharger as set forth in claim 1, characterized by the cooling liquid flows out after passing through the electric control assembly cooling cavity (63) and then passing through the electric motor assembly cooling cavity (65); the position where the cooling liquid from the outlet of the electric control assembly cooling cavity (63) enters the electric motor assembly cooling cavity (65) is at the bending position of the channel, and the cooling liquid is divided into two paths and flows in the interlayer space, and finally converges and flows out.

3. An electric motor-driven supercharger as set forth in claim 2 wherein, a protruding structure is arranged on the rear cover plate (34) at the position of the concave portion, and a bearing (33) and a shaft seal sleeve (32) are arranged on the position of the rotating shaft (31) penetrating through the protruding structure.

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