Air compressor

Abstract

The utility model provides an air compressor which comprises a motor assembly which comprises a motor shell, a rotating shaft, a stator and a liquid cooling structure, the rotating shaft, the stator and the liquid cooling structure are arranged in the motor shell, and the stator is sleeved with the liquid cooling structure; and the air compression assembly is configured to be suitable for being driven by the motor assembly to compress air. The motor housing is internally provided with an air flow channel, and the air flow channel is provided with an air inlet pipeline and an air outlet pipeline which are communicated with the outside of the motor housing, and comprises a first air flow path which is arranged adjacent to the liquid cooling structure. The liquid cooling structure comprises a cylindrical sleeve body, a cooling liquid flow channel arranged on the peripheral surface of the sleeve body and an air channel arrangement area formed between the side walls of the cooling liquid flow channel along the peripheral surface of the sleeve body, and the first air flow path is suitable for being at least partially arranged in the air channel arrangement area. According to the embodiment of the utility model, the outer diameter size of the motor shell can be reduced, the motor shell is enabled to have a relatively regular and roughly cylindrical shape, and the complexity and the manufacturing cost of the air compressor are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air compressors, in particular to a cooling structure inside an air compressor. Background Art

[0002] An air compressor generates a large amount of heat during operation. Therefore, a gas cooling channel and a liquid cooling channel are usually provided in the air compressor to dissipate heat from various components inside the air compressor.

[0003] There is an air compressor in the prior art, such as Figure 5 As shown in FIG. 1 , in the inner cavity defined by the housing, the water jacket is disposed on the outer periphery of the stator, including a sleeve and a coolant flow channel C that is distributed in a spiral form on the outer periphery of the sleeve. The housing of the air compressor is also provided with an air flow channel, which includes an air flow path (such as a gas flow path) disposed radially outside the water jacket, that is, disposed above the coolant flow channel. Figure 5 The air in the air flow path is arranged along the path where the arrow in the water jacket is located), so that the gas in the air flow path flows to the corresponding components in the air compressor after passing through the water jacket and being cooled by the coolant to dissipate heat from these components. In such an air compressor, the structure in which a part of the air flow path of the air flow channel is arranged radially outside the water jacket increases the outer diameter of the air compressor on the one hand, so that the housing must have a special space and shape to additionally accommodate the air flow channel protruding on the outer surface of the water jacket. On the other hand, such an irregular structure increases the complexity of the sealing of the air flow path and increases the overall manufacturing complexity and manufacturing cost of the air compressor.

[0004] Therefore, there is a need to reduce the external size and manufacturing complexity of an air compressor while ensuring the internal cooling performance of the air compressor. Utility Model Content

[0005] The purpose of the utility model is to provide an air compressor, so as to at least partially solve the above problems existing in the prior art.

[0006] According to a first aspect of the utility model, an air compressor is provided, characterized in that the air compressor comprises:

[0007] A motor assembly, the motor assembly comprising a motor housing and a rotating shaft, a stator and a liquid cooling structure arranged in the motor housing, the stator is sleeved on the rotating shaft, and the liquid cooling structure is sleeved on the stator; and

[0008] an air compression assembly, the air compression assembly being configured to be driven by the motor assembly to compress air,

[0009] The motor housing is provided with an air flow channel, the air flow channel having an air inlet duct and an air outlet duct communicating with the outside of the motor housing, and the air flow channel includes a first air flow path arranged adjacent to the liquid cooling structure, and

[0010] Wherein, the liquid cooling structure includes a cylindrical sleeve body, a coolant flow channel arranged on the outer peripheral surface of the sleeve body, and an air channel arrangement area formed between the side walls of the coolant flow channel along the outer peripheral surface of the sleeve body, and the first air flow path is suitable for being at least partially arranged in the air channel arrangement area.

[0011] In an exemplary embodiment, the air passage arrangement area extends along the axial direction of the sleeve body.

[0012] In an exemplary embodiment, the coolant flow passage is formed as a continuous labyrinth-like coolant flow passage in a region of the outer peripheral surface of the sleeve body except for the air passage arrangement region.

[0013] In an exemplary embodiment, the liquid cooling structure further includes an outer peripheral wall integrally covering the cooling liquid flow channel and the air channel arrangement area.

[0014] In an exemplary embodiment, the motor housing is formed in a substantially cylindrical shape.

[0015] In an exemplary embodiment, one of the water inlet and the water outlet of the coolant flow channel is disposed at one end portion of the sleeve body in the axial direction, and the other is disposed at the middle portion of the sleeve body in the axial direction.

[0016] In an exemplary embodiment, the coolant channels are closely arranged in a "Z" shape along the circumferential direction and / or axial direction of the sleeve body.

[0017] In an exemplary embodiment, the coolant flow channels are closely arranged in a "Z" shape along the circumference of the sleeve body, and are bent and turned back near the air channel arrangement area.

[0018] In an exemplary embodiment, the coolant flow channels are closely arranged in a "Z" shape along the axial direction of the sleeve body, and are bent and turned back at each end adjacent to the axial direction of the sleeve body.

[0019] In an exemplary embodiment, the air compression assembly is mounted at one end of the motor housing, and the air intake duct is in communication with an inner space of the air compression assembly.

[0020] In an exemplary embodiment, the airflow channel also includes a C-shaped second airflow path, wherein one end of the C-shape is connected to the air intake duct, and the other end of the C-shape is connected to one end of the first airflow path, and the second airflow path is sleeved on the liquid cooling structure.

[0021] In an exemplary embodiment, the liquid cooling structure also includes an annular channel arrangement area formed at a partial section in the axial direction of the sleeve body, a radial height of a portion of the coolant flow channel in the annular channel arrangement area is lower than a radial height of a portion of the coolant flow channel outside the annular channel arrangement area, and the second air flow path is suitable for being arranged at the annular channel arrangement area.

[0022] In an exemplary embodiment, a plurality of fins and / or a plurality of pin fins extending radially outward are disposed in the second airflow path.

[0023] In an exemplary embodiment, the annular channel arrangement area is located at a first end portion of the sleeve body adjacent to the air compression component in the axial direction.

[0024] In an exemplary embodiment, the water inlet of the coolant flow channel is located at the second end of the sleeve body in the axial direction away from the air compression component, and the water outlet is located in the middle of the sleeve body in the axial direction adjacent to the annular channel arrangement area.

[0025] In an exemplary embodiment, the air flow channel further includes a third air flow path, which is connected to the other end of the C-shape of the second air flow path and is connected to the air outlet duct after passing through a space between the rotating shaft and the stator.

[0026] In an exemplary embodiment, the motor assembly also includes a first end cover arranged at the one end of the motor housing, a thrust bearing and a first radial bearing arranged in the first end cover in sequence, and the third airflow path includes a plurality of cooling branches suitable for cooling the thrust bearing and the first radial bearing, and the plurality of cooling branches converge at a side of the first radial bearing away from the first end cover and lead to the space between the rotating shaft and the stator.

[0027] In an exemplary embodiment, the motor assembly further includes a second end cover disposed at the other end of the motor housing opposite to the one end, and a second radial bearing disposed in the second end cover.

[0028] In an exemplary embodiment, the air compressor further includes a turbine assembly mounted at another end of the motor housing opposite to the one end.

[0029] In an exemplary embodiment, the airflow channel also includes a fourth airflow path, which is connected to the other end of the first airflow path, and after passing through the space between the second radial bearing and the rotating shaft, merges with the third airflow path on the side of the second radial bearing away from the second end cover, and then is connected to the air outlet duct.

[0030] The beneficial effect of the utility model according to the above-mentioned aspects of the utility model lies in that, since the liquid cooling structure includes an air duct arrangement area formed between the side walls of the coolant flow channel along the outer peripheral surface of the sleeve body of the liquid cooling structure, and the first air flow path of the air flow channel arranged adjacent to the liquid cooling structure is at least partially arranged in the air duct arrangement area, thereby avoiding the first air flow path being arranged above the coolant flow channel. Therefore, the outer diameter dimension of the motor housing at the liquid cooling structure can be reduced, so that the motor housing can have a relatively regular roughly cylindrical shape, obtain a better appearance, and can reduce the sealing complexity of the relevant air flow path, thereby reducing the overall structure and manufacturing complexity of the air compressor and reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be described in more detail below with reference to the accompanying drawings, so that the principles, features and advantages of the present invention can be better understood. The accompanying drawings include:

[0032] Figure 1 Schematically shows a cross-sectional view of an air compressor according to an exemplary embodiment of the present utility model;

[0033] Figure 2 A schematic diagram schematically shows the layout of a portion of an air flow passage of an air compressor according to an exemplary embodiment of the present utility model;

[0034] Figure 3 A perspective view schematically shows a liquid cooling structure of an air compressor according to an exemplary embodiment of the present utility model;

[0035] Figure 4 schematically illustrates a plurality of air flow paths within an air compressor according to an exemplary embodiment of the present invention; and

[0036] Figure 5 A cross-sectional view of a prior art air compressor is schematically shown. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the scope of protection of the present invention.

[0038] Figure 1 A cross-sectional view of an air compressor 100 according to an exemplary embodiment of the present invention is schematically shown. Figure 2 The diagram schematically shows the layout of the air flow channel 5 of the air compressor 100 according to an exemplary embodiment of the present utility model. Figure 3 The figure schematically shows a perspective view of a liquid cooling structure 4 of an air compressor 100 according to an exemplary embodiment of the present invention. Figure 4 A plurality of air flow paths within an air compressor 100 according to an exemplary embodiment of the present invention are schematically shown.

[0039] like Figures 1 to 4 As shown, an air compressor 100 according to an exemplary embodiment of the present invention comprises at least a motor assembly 1 and an air compression assembly 9 , and is configured such that the motor assembly 1 drives the air compression assembly 9 to compress air.

[0040] The motor assembly 1 includes a motor housing 10, which defines an inner cavity of the motor assembly 1 to accommodate the internal components of the motor assembly 1, mainly including a rotating shaft 2, a stator 3 and a liquid cooling structure 4 arranged in the motor housing 10, wherein the rotating shaft 2 is arranged at the center of the motor housing 10, the stator 3 is sleeved on the rotating shaft 2, and the liquid cooling structure 4 is sleeved on the stator 3. The motor housing 10 has a first end (one end) 110 and a second end (the other end) 120 opposite to the first end, and the air compression assembly 9 is arranged at the first end 110 of the motor housing 10, that is, Figure 1 The left end of .

[0041] At the first end 110 of the motor housing 10, the motor assembly 1 also includes a first end cover 111 disposed on the motor housing 10, thrust bearings 112, 113 and a first radial bearing 114 disposed in the first end cover 111 in sequence. Correspondingly, the rotating shaft 2 includes a first main shaft section 21, a flying disc 23 and an impeller mounting shaft section 24 at one end adjacent to the first end 110 of the motor housing 10. The impeller mounting shaft section 24 extends from the first main shaft section 21 and extends out of the motor housing 10 through the first end cover 111, and the impeller 91 of the air compression assembly 9 is rotationally coupled and mounted on the impeller mounting shaft section 24 on the outside of the first end cover 111. The flying disc 23 is an annular flange extending radially outward from the portion between the impeller mounting shaft section 24 and the first main shaft section 21. The first radial bearing 114 is sleeved on the first main shaft section 21. The thrust bearings 112 and 113 are respectively arranged between the first end cover 111 and the flying disc 23 and between the flying disc 23 and the first radial bearing 114. In addition, on the inner side of the first end cover 111, the motor assembly 1 also includes a flange 115 and a first bearing seat 116 fixed to the first end cover 111. The flange 115 is configured in an annular shape and is located radially outside the flying disc 23 and the thrust bearing 112. The first bearing seat 116 is arranged adjacent to the flange 115, is located radially outside the thrust bearing 113 and the first radial bearing 114, and provides support for the thrust bearing 113 and the first radial bearing 114.

[0042] At the second end 120 of the motor housing 10, the motor assembly 1 also includes a second end cover 121 arranged in the motor housing 10 and a second bearing seat 122 and a second radial bearing 123 arranged in the second end cover 121. The second radial bearing 123 is sleeved on the second main shaft section 22 adjacent to the second end 120 of the rotating shaft 2. The second bearing seat 122 is fixed to the second end cover 121 and provides support for the second radial bearing 123.

[0043] Thus, the rotating shaft 2 is rotatably supported in the motor housing 10 by the first radial bearing 114 and the second radial bearing 123 disposed on the first main shaft section 21 and the second main shaft section 22 at both ends thereof. In addition, a permanent magnet 20 is disposed between the first main shaft section 21 and the second main shaft section 22 of the rotating shaft 2, and the stator 3 is sleeved on the rotating shaft 2 at the shaft section corresponding to the permanent magnet 20.

[0044] In the air compressor 100 according to this exemplary embodiment, at least the thrust bearings 112 and 113 , the first radial bearing 114 , the rotating shaft 2 , and the second radial bearing 123 all need to be gas-cooled by the cooling air flow.

[0045] like Figure 1 , Figure 2 and Figure 4As shown, for gas cooling of the above-mentioned components, an air flow channel 5 is also provided in the motor housing 10, and the air flow channel 5 has an air inlet duct 501 and an air outlet duct 502 connected to the outside of the motor housing 10, and has a first air flow path 510, a second air flow path 520, a third air flow path 530 and a fourth air flow path 540 that are connected to each other and connected to the air inlet duct 501 and the air outlet duct 502. Preferably, the air inlet duct 501 is arranged adjacent to the first end 110 of the motor housing 10, and is connected to the internal space of the air compression assembly 9, so that there is no need to obtain cooling air with the help of an external intercooler, etc., but the compressed air is cooled by the liquid cooling structure 4 already in the air compressor 100 via the first air flow path 510 and the second air flow path 520 to serve as cooling gas. This is described in detail below.

[0046] First, the first airflow path 510 is described. The first airflow path 510 is arranged adjacent to the liquid cooling structure 4, and is used to further cool the gas and transport it from the first end 110 of the motor housing 10 to the second end 120, so as to cool the components at the second end 120, such as the second main shaft section 22 of the rotating shaft 2 and the second radial bearing 123. To this end, Figure 3 As shown, the liquid cooling structure 4 is also generally in the form of a water jacket, which includes: a cylindrical sleeve body 40, which is sleeved on the outer periphery of the stator 3; a coolant flow channel 41, which is arranged on the outer peripheral surface of the sleeve body 40; and an air channel arrangement area 42 ( Figure 3 Schematically shown in dotted lines in the figure). Here, the side wall of the coolant flow channel 41 specifically refers to a wall erected from the outer peripheral surface of the sleeve body 40 along the radial direction of the sleeve body 40. Optionally, the liquid cooling structure 4 also includes an outer peripheral wall that integrally covers the coolant flow channel 41 and the air channel arrangement area 42. Further optionally, the air channel arrangement area 42 can be a solid channel between the side walls of the coolant flow channel 41 and the outer peripheral wall and the sleeve body 40. Through this construction of the liquid cooling structure 4, in the same radial interval on the outer periphery of the sleeve body 40 of the liquid cooling structure 4, a coolant flow channel arrangement area (i.e., the coolant flow channel 41) for the flow of coolant is formed, and an air channel arrangement area 42 for arranging the first air flow path 510 is formed, so that the first air flow path 510 can be at least partially, preferably completely embedded in the overall outer peripheral surface or outer peripheral wall of the liquid cooling structure 4, as shown in FIG. Figure 4Therefore, compared with the prior art solution in which the airflow path is arranged on the coolant flow channel of the water jacket, the overall size of the first airflow path 510 and the liquid cooling structure 4 can be reduced, and a relatively regular roughly columnar shape of the two can be obtained as a whole, so that the motor housing 10 can have a relatively regular roughly cylindrical shape, and a better appearance can be obtained, and thus the sealing complexity of the relevant airflow path can be reduced, and then the overall structure and manufacturing complexity of the air compressor 100 can be reduced, and the manufacturing cost can be reduced.

[0047] In a preferred embodiment, Figure 3 As shown, the airway arrangement area 42 extends along the axial direction of the sleeve body 40. The liquid cooling structure 4 constructed in this way can make the layout of the airflow path simple, and can not only realize the further cooling of the gas in the first airflow path 510 by the coolant, but also fully guarantee the flow area of ​​the coolant, and then fully guarantee the cooling performance of the liquid cooling structure 4 itself, without affecting the cooling of the stator 3, etc. Of course, according to actual needs, the airway arrangement area 42 can also have other directions or routes along the surface of the sleeve body 40, such as a winding route or a spiral route around the sleeve body 40, etc., and the width of the airway arrangement area 42 can also be adjusted accordingly to achieve the required cooling effect on the gas and the stator 3.

[0048] In a preferred embodiment, the coolant flow channel 41 is formed as a continuous labyrinth-type coolant flow channel 41 in the area of ​​the outer peripheral surface of the sleeve body 40 except the air channel arrangement area 42. Here, "labyrinth-type" refers to the winding arrangement of the coolant flow channel 41, so that the coolant can flow through the corresponding area of ​​the sleeve body 40 along a longer path.

[0049] In an exemplary embodiment, the coolant flow channels 41 are closely arranged in a "Z" shape along the circumference and / or axial direction of the sleeve body 40. For example, optionally, as Figure 3 As shown, the coolant flow channel 41 can be closely arranged in a "Z" shape along the circumference of the sleeve body 40, and bend and turn back at the adjacent air channel arrangement area 42. In another optional example, the coolant flow channel 41 can be closely arranged in a "Z" shape along the axial direction of the sleeve body 40, and bend and turn back at the two ends adjacent to the axial direction of the sleeve body 40.

[0050] This labyrinth-like, especially "Z"-shaped arrangement of the coolant flow channels 41 can fully utilize the coolant flow channels 41 arrangement area on the outer periphery of the sleeve body 40, thereby giving full play to the liquid cooling performance of the liquid cooling structure 4 itself.

[0051] In a preferred embodiment, one of the water inlet 411 and the water outlet 412 of the coolant flow channel 41 is arranged at one end of the sleeve body 40 in the axial direction and the other is arranged at the middle of the sleeve body 40 in the axial direction. Preferably, the water inlet 411 for the coolant to enter the coolant flow channel 41 is arranged at one end of the sleeve body 40 in the axial direction, especially at one end away from the first end 110 of the motor housing 10, that is, away from the air intake pipe 501 (the second end of the sleeve body 40), and the water outlet 412 for the coolant to flow out of the coolant flow channel 41 is arranged at the middle of the sleeve body 40 in the axial direction, especially at one side of the middle part relatively close to the first end 110 of the motor housing 10 and the air intake pipe 501 (the first end of the sleeve body 40). In this way, the coolant in the liquid cooling structure 4 is first used to focus on the heat dissipation of the center of the motor stator 3, and at the same time, the gas can be fully cooled.

[0052] The first airflow path 510 is connected to the air intake duct 501 through the second airflow path 520. Figure 2 As shown, the second airflow path 520 is formed into a C-shaped ring, one end of the C-shape is connected to the air intake duct 501, and the other end of the C-shape is connected to one end of the first airflow path 510. The C-shaped second airflow path 520 is also sleeved on the liquid cooling structure 4, preferably sleeved at the end of the liquid cooling structure 4 close to the first end 110 of the motor housing 10, so that the compressed air entering the air intake duct 501 from the air compression component 9 can be immediately cooled by the coolant in the liquid cooling structure 4 at the second airflow path 520, and then supplied as cooling gas to the corresponding components in the motor component 1 for gas cooling.

[0053] In a preferred embodiment, the liquid cooling structure 4 also includes an annular channel arrangement area 43 formed at a partial section in the axial direction of the sleeve body 40, the radial height of the portion of the outer peripheral wall and / or the coolant channel 41 in the annular channel arrangement area is lower than the radial height of the portion of the coolant channel 41 outside the annular channel arrangement area, and the second airflow path 520 is suitable for being arranged in the annular channel arrangement area 43. In this way, even if the C-shaped second airflow path 520 is also sleeved on the liquid cooling structure 4, the overall size of the second airflow path 520, the first airflow path 510 and the liquid cooling structure 4 can be reduced to obtain an overall more regular roughly cylindrical shape, so that the motor housing 10 can have a relatively regular roughly cylindrical shape, thereby obtaining a better appearance, and thereby reducing the sealing complexity of the relevant airflow path, reducing the overall complexity and manufacturing cost of the air compressor 100. Note that the arrangement of the first airflow path 510 and the second airflow path 520 in the annular channel arrangement area 43 is not limited here. For example, in Figure 1 , Figure 3 and Figure 4FIG. 4 exemplarily shows an arrangement in which the first airflow path 510 is arranged radially inward of the second airflow path 520. Figure 2 The schematic diagram shows an arrangement in which the first airflow path 510 is arranged radially outside the second airflow path 520 . Those skilled in the art will appreciate that both arrangements are feasible.

[0054] Particularly preferably, corresponding to the second airflow path 520 sleeved at the end of the liquid cooling structure 4 close to the first end 110 of the motor housing 10 , the annular channel arrangement area 43 is located at the first end of the sleeve body 40 in the axial direction close to the air compression component 9 .

[0055] In a preferred embodiment, a plurality of fins and / or a plurality of pin fins (not marked in the figure) extending radially outward are provided in the second air flow path 520, thereby increasing the heat exchange area and achieving a better cooling effect on the compressed air.

[0056] In a preferred embodiment, the water inlet 411 of the coolant flow channel 41 is located at the second end of the sleeve body 40 axially away from the air compression assembly 9 , and the water outlet 412 is located in the middle of the sleeve body 40 axially adjacent to the annular channel arrangement area 43 .

[0057] The other end of the C-shaped second airflow path 520 is connected to one end of the first airflow path 510 and is also connected to the third airflow path 530. Figure 2 As shown by the arrow, after the compressed air entering from the air intake duct 501 goes around the liquid cooling structure 4 along the C-shaped second air flow path 520 for nearly a circle and is cooled by the liquid cooling structure 4, it is divided into two paths at the other end of the second air flow path 520, one path flows into the first air flow path 510, and the other path flows into the third air flow path 530.

[0058] like Figure 4 As shown by the dashed arrows in FIG. 1 , the third airflow path 530 includes a plurality of cooling branches suitable for cooling the thrust bearings 112, 113 and the first radial bearing 114 (see FIG. Figure 4 ), the plurality of cooling branches converge at a side of the first radial bearing 114 away from the first end cover 111 and lead to the space between the rotating shaft 2 and the stator 3 (see Figure 2 ), and then connected to the air outlet duct 502. In this way, the thrust bearings 112, 113, the first radial bearing 114, and the area between the stator 3 and the rotating shaft 2 can be cooled by using a portion of the cooling gas cooled by the liquid cooling structure 4. For example, the flange 115 can be provided with an air guide groove as a part of the third airflow path 530 and connected to the second airflow path 520, so as to guide the cooling gas from the second airflow path 520 to the multiple cooling branches of the third airflow path 530.

[0059] The other end of the first airflow path 510 is connected to the fourth airflow path 540. Figure 4 As shown by the solid arrow in , the fourth airflow path 540 at least includes the space between the second bearing seat 122 and the second end cover 121 and the space between the second radial bearing 123 and the second main body shaft section 22. After passing through the space between the second bearing seat 122 and the second end cover 121 and the space between the second radial bearing 123 and the second main body shaft section 22, a portion of the cooling gas flowing in through the first airflow path 510 merges with the third airflow path 530 on the side of the second radial bearing 123 away from the second end cover 121, and then communicates with the third airflow path 530 to the air outlet duct 502.

[0060] In a preferred exemplary embodiment, the air compressor 100 further includes a turbine assembly 8 mounted on the second end 120 of the motor housing 10. In this case, the air compressor 100 is a single-stage compressor having the turbine assembly 8. In this case, the fourth airflow path 540 is designed to allow the air flow to flow inside the second end cover 121, especially inside the second end cover 121. Figure 4 A larger cooling gas pressure is established in the space P schematically shown in the figure, thereby preventing foreign matter such as water from the turbine assembly 8 from entering the motor housing 10 from the turbine assembly 8.

[0061] Although specific embodiments of the present invention are described in detail herein, they are provided for the purpose of explanation only and should not be considered to limit the scope of the present invention. Various substitutions, changes and modifications may be conceived without departing from the spirit and scope of the present invention.

Claims

1. An air compressor, characterized in that: The air compressor (100) comprises: A motor assembly (1), the motor assembly (1) comprising a motor housing (10), a rotating shaft (2), a stator (3) and a liquid cooling structure (4) arranged in the motor housing (10), the stator (3) being sleeved on the rotating shaft (2), and the liquid cooling structure (4) being sleeved on the stator (3); and an air compression assembly (9), the air compression assembly (9) being configured to be driven by the motor assembly (1) to compress air, The motor housing (10) is provided with an air flow channel (5), the air flow channel (5) having an air inlet duct (501) and an air outlet duct (502) communicating with the outside of the motor housing (10), and the air flow channel (5) comprises a first air flow path (510) arranged adjacent to the liquid cooling structure (4), and The liquid cooling structure (4) comprises a cylindrical sleeve body (40), a coolant flow channel (41) arranged on the outer peripheral surface of the sleeve body (40), and an air channel arrangement area (42) formed between the side walls of the coolant flow channel (41) along the outer peripheral surface of the sleeve body (40), and the first air flow path (510) is suitable for being at least partially arranged in the air channel arrangement area (42).

2. The air compressor according to claim 1, characterized in that: The air passage arrangement area (42) extends along the axial direction of the sleeve body (40); The coolant flow channel (41) is formed as a continuous labyrinth-type coolant flow channel (41) in an area other than the air channel arrangement area (42) on the outer peripheral surface of the sleeve body (40); The liquid cooling structure (4) further comprises an outer peripheral wall integrally covering the cooling liquid flow channel (41) and the air channel arrangement area (42); and / or The motor housing (10) is formed in a substantially cylindrical shape.

3. The air compressor according to claim 1 or 2, characterized in that: One of the water inlet (411) and the water outlet (412) of the coolant flow channel (41) is arranged at one end of the sleeve body (40) in the axial direction and the other is arranged at the middle of the sleeve body (40) in the axial direction; and / or The coolant flow channels (41) are closely arranged in a "Z" shape along the circumference and / or axial direction of the sleeve body (40).

4. The air compressor according to claim 3, characterized in that: The coolant flow channels (41) are closely arranged in a "Z" shape along the circumference of the sleeve body (40), and are bent and folded back near the air channel arrangement area (42); or The coolant flow channel (41) is closely arranged in a "Z" shape along the axial direction of the sleeve body (40), and is bent back at each end portion in the axial direction adjacent to the sleeve body (40).

5. The air compressor according to claim 1, 2 or 4, characterized in that: The air compression component (9) is mounted at one end (110) of the motor housing (10), and the air intake duct (501) is in communication with the internal space of the air compression component (9); and / or The airflow channel (5) also includes a C-shaped second airflow path (520), wherein one end of the C-shape is connected to the air intake duct (501), and the other end of the C-shape is connected to one end of the first airflow path (510), and the second airflow path (520) is sleeved on the liquid cooling structure (4).

6. The air compressor according to claim 5, characterized in that: The liquid cooling structure (4) further comprises an annular channel arrangement area (43) formed at a partial section in the axial direction of the sleeve body (40), the radial height of the portion of the coolant flow channel (41) in the annular channel arrangement area (43) is lower than the radial height of the portion of the coolant flow channel (41) outside the annular channel arrangement area, and the second air flow path (520) is suitable for being arranged at the annular channel arrangement area (43); and / or A plurality of fins and / or a plurality of pin fins extending radially outward are arranged in the second airflow path (520).

7. The air compressor according to claim 6, characterized in that: The annular channel arrangement area (43) is located at a first end portion of the sleeve body (40) adjacent to the air compression component (9) in the axial direction; and / or The water inlet (411) of the coolant flow channel (41) is located at the second end of the sleeve body (40) in the axial direction away from the air compression component (9), and the water outlet (412) is located in the middle of the sleeve body (40) in the axial direction adjacent to the annular arrangement area (43).

8. The air compressor according to claim 5, characterized in that: The air flow channel (5) further comprises a third air flow path (530), wherein the third air flow path (530) is connected to the other end of the C-shape of the second air flow path (520), and is connected to the air outlet duct (502) after passing through the space between the rotating shaft (2) and the stator (3).

9. The air compressor according to claim 8, characterized in that: The motor assembly (1) further comprises a first end cover (111) arranged at the one end (110) of the motor housing (10), a thrust bearing (112, 113) and a first radial bearing (114) arranged in sequence in the first end cover (111), and the third airflow path (530) comprises a plurality of cooling branches suitable for cooling the thrust bearing (112, 113) and the first radial bearing (114), the plurality of cooling branches converge at a side of the first radial bearing (114) away from the first end cover (111) and lead to a space between the rotating shaft (2) and the stator (3); The motor assembly (1) further comprises a second end cover (121) arranged at the other end (120) of the motor housing (10) opposite to the one end (110) and a second radial bearing (123) arranged in the second end cover (121); and / or The air compressor (100) further includes a turbine assembly (8) mounted on the other end (120) of the motor housing (10) opposite to the one end (110).

10. The air compressor according to claim 9, characterized in that: The air flow channel (5) further includes a fourth air flow path (540), which is connected to the other end of the first air flow path (510), passes through the space between the second radial bearing (123) and the rotating shaft (2), merges with the third air flow path (530) on the side of the second radial bearing (123) away from the second end cover (121), and is then connected to the air outlet duct (502).

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