Electric compressor

Abstract

The utility model belongs to the technical field of compressors, and discloses an electric compressor, fluid flows into a downstream cavity through a plurality of cooling through holes after entering an upstream cavity through a fluid inlet, and the middle part of a stator is cooled through the fluid flowing in the cooling through holes, so that the cooling effect of the stator can be ensured to meet the requirement; therefore, the influence on the efficiency of the driving motor due to substandard cooling effect of the driving motor is avoided, particularly, the efficiency loss caused by overheating of the stator of the driving motor under a high-load and high-torque working condition can be reduced, and the high-efficiency output of the driving motor under the high-load working condition is ensured.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to an electric compressor. Background Technology

[0002] The drive motor of an electric compressor generates heat during operation. To address this, existing technologies typically force refrigerant through the air gap between the stator and rotor and / or the gap between the inner wall of the housing and the outer wall of the stator to cool the drive motor before it is drawn into the compression components of the electric compressor for compression.

[0003] However, the above-mentioned cooling methods mainly focus on cooling the windings outside the stator and inside the slots. The temperature in the middle of the stator is still relatively high, and the cooling effect of the drive motor is insufficient, thus affecting the efficiency of the drive motor. Utility Model Content

[0004] The purpose of this invention is to provide an electric compressor that can improve the cooling effect of the drive motor.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An electric compressor includes a scroll compressor assembly, a housing, and a drive motor disposed within the housing. The drive motor includes a stator and a rotor rotatably passing through the stator. The inner cavity of the housing includes an upstream chamber and a downstream chamber located at opposite axial ends of the stator. The scroll compressor assembly is located in the downstream chamber. The upstream chamber has a fluid inlet disposed within the housing.

[0007] The stator core of the stator includes a core yoke, and the core yoke is provided with a plurality of cooling through holes arranged at intervals along its circumference. The cooling through holes are configured to connect the upstream chamber and the downstream chamber.

[0008] As one possible implementation of the above-mentioned electric compressor, the stator core further includes a plurality of core teeth protruding from the inner peripheral wall of the core yoke and arranged at intervals along the circumference of the core yoke.

[0009] Along the circumference of the stator, a tooth groove is formed between two adjacent iron core teeth, and the cooling through hole is located between two adjacent tooth grooves.

[0010] As one possible implementation of the above-mentioned electric compressor, the ratio between the number of toothed grooves and the number of cooling through holes is 3K, where K is an integer greater than or equal to 1;

[0011] And / or, the ratio of the cross-sectional area of ​​the cooling through-hole to the cross-sectional area of ​​the fluid inlet is Q, where 1 ≤ Q ≤ 25.

[0012] As one possible implementation of the above-mentioned electric compressor, the stator core includes a plurality of stator laminations stacked along its axial direction. Each stator lamination is provided with a plurality of cooling sub-holes corresponding one-to-one with the plurality of cooling through holes. The plurality of stator laminations are stacked along the axial direction of the stator core so that the corresponding cooling sub-holes are stacked to form the cooling through holes.

[0013] The stator laminations are divided into at least two groups along the axial direction of the stator. Each group of stator laminations includes at least one stator lamination. The projections of the cooling sub-holes on the stator laminations in the same group on a preset plane completely overlap. The projections of the cooling sub-holes on the preset plane of at least two adjacent groups of stator laminations partially overlap and partially do not overlap.

[0014] The preset plane is perpendicular to the axial direction of the stator.

[0015] As one possible implementation of the above-mentioned electric compressor, for two adjacent sets of stator laminations where the projections of the cooling sub-holes on the preset plane partially overlap and partially do not overlap, the central axes of the corresponding cooling sub-holes on the two sets of stator laminations are arranged at intervals along the circumferential and / or radial directions of the stator.

[0016] As one possible implementation of the aforementioned electric compressor, the cooling through hole is a threaded hole.

[0017] As one possible implementation of the above-mentioned electric compressor, a first cooling channel is formed between the inner peripheral wall of the housing and the outer peripheral wall of the stator, and the upstream chamber is connected to the downstream chamber through the first cooling channel.

[0018] As one possible implementation of the above-mentioned electric compressor, the electric compressor further includes a flow collector, one end of the stator is installed inside the flow collector, and the end face of the stator near the end of the flow collector and the inner wall of the flow collector form the upstream chamber.

[0019] A second cooling channel is formed between the outer peripheral wall of the stator and the inner peripheral wall of the collector shroud, and the upstream chamber is connected to the downstream chamber through the second cooling channel.

[0020] As one possible implementation of the electric compressor described above, the electric compressor further includes a flow guide shroud located in the downstream chamber, the flow guide shroud being used to direct the fluid flowing out of the cooling through hole to the stator winding extending axially along the stator core.

[0021] As one possible implementation of the aforementioned electric compressor, the inner peripheral wall of the flow guide has a flow guiding surface, which gradually approaches the central axis of the stator in the direction from the upstream chamber to the downstream chamber.

[0022] The beneficial effects of this utility model are as follows: During the operation of the electric compressor, the fluid enters the upstream chamber through the fluid inlet and flows to the downstream chamber through multiple cooling holes. The fluid flowing through the cooling holes cools the middle part of the stator, ensuring that the cooling effect of the stator meets the requirements. This avoids the impact on the efficiency of the drive motor due to the substandard cooling effect, and in particular, it can reduce the efficiency loss caused by stator overheating under high load and high torque conditions, ensuring high-efficiency output of the drive motor under high load conditions. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the electric compressor provided in an embodiment of the present utility model;

[0024] Figure 2 This is a partial cross-sectional view of the stator provided in an embodiment of the present invention from a first perspective;

[0025] Figure 3 This is a partial cross-sectional view of the stator provided in an embodiment of the present invention from a second perspective;

[0026] Figure 4 This is a schematic diagram of the motor as viewed from one axial end according to an embodiment of the present invention;

[0027] Figure 5 This is a partial sectional view of the stator provided in an embodiment of the present invention;

[0028] Figure 6 yes Figure 2 A magnified view of a portion of point A in the middle;

[0029] Figure 7 This is a rotating sectional view of the motor provided in an embodiment of the present invention.

[0030] In the picture:

[0031] 1. Outer shell; 11. Fluid inlet; 12. First hole; 13. Second hole;

[0032] 2. Drive motor; 21. Stator; 211. Stator core; 2110. Stator lamination; 21101. Cooling sub-hole; 2111. Core yoke; 21111. Cooling through hole; 2112. Core tooth; 2113. Tooth groove; 2114. Second cooling groove; 212. Stator winding; 22. Rotor; 23. Shaft;

[0033] 3. Flushing shroud; 31. Suction vent;

[0034] 4. Flow deflector; 41. Connecting hole; 42. Flow guide surface;

[0035] 5. Oil pipes;

[0036] 6. Upstream bearing housing; 7. Downstream bearing housing; 8. Stationary scroll; 9. Moving scroll; 10. Outer casing;

[0037] 100. Upstream chamber; 200. Downstream chamber; 210. Guide chamber; 220. Connecting chamber; 300. First cooling channel; 400. Air gap; 500. Second cooling channel; 600. Oil sump; 700. Outer flow channel. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0039] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] This utility model provides an electric compressor to improve the cooling effect of the drive motor. It should be noted that the fluid compressed by the electric compressor can be either a liquid or a gas. The following description uses a gas compressor as an example, specifically a gas compressor, and details its structure.

[0043] like Figures 1 to 5 As shown, the electric compressor includes a scroll compressor assembly, a housing 1, and a drive motor 2 disposed within the housing 1. The drive motor 2 includes a stator 21 and a rotor 22 rotatably passing through the stator 21. The inner cavity of the housing 1 includes an upstream chamber 100 and a downstream chamber 200 located at opposite axial ends of the stator 21. The scroll compressor assembly is located in the downstream chamber 200. The upstream chamber 100 has a fluid inlet 11 disposed on the housing 1. The stator core 211 of the stator 21 includes a core yoke 2111. The core yoke 2111 is provided with a plurality of cooling through holes 21111 arranged circumferentially thereon. The cooling through holes 21111 are configured to connect the upstream chamber 100 and the downstream chamber 200.

[0044] After the fluid enters the upstream chamber 100 through the fluid inlet 11, it flows into the downstream chamber 200 through multiple cooling through holes 21111. The fluid flowing through the cooling through holes 21111 cools the middle part of the stator 21. By cooling multiple parts of the stator 21, the cooling effect of the stator 21 can be guaranteed to meet the requirements, thereby avoiding the impact on the efficiency of the drive motor 2 due to the substandard cooling effect. In particular, it can reduce the efficiency loss caused by the overheating of the stator 21 under high load and high torque conditions, and ensure the high-efficiency output of the drive motor 2 under high load conditions.

[0045] The scroll compressor assembly includes a scroll compressor chamber, a drive shaft, a stationary scroll 8, and a moving scroll 9. The drive shaft is fixedly mounted on the rotor 22 and one end is connected to the moving scroll 9. Both the moving scroll 9 and the stationary scroll 8 are located within the scroll compressor chamber, and the moving scroll 9 and the stationary scroll 8 mesh. Fluid flowing out of the downstream chamber 200 enters the scroll compressor chamber. During the operation of the electric compressor, under the action of pressure difference, external fluid enters the upstream chamber 100 through the fluid inlet 11. The fluid in the upstream chamber 100 enters the downstream chamber 200 through multiple cooling through-holes 21111. The fluid in the downstream chamber 200 enters the scroll compressor chamber and is compressed by the meshing of the moving scroll 9 and the stationary scroll 8 to form a high-pressure fluid, without the need for additional power.

[0046] An air gap 400 exists between the stator 21 and the rotor 22. The fluid flowing through the air gap 400 cools the stator winding 212 and the stator core 211 of the stator 21. When the fluid in the upstream chamber 100 is sent to the downstream chamber 200 using only the air gap 400 between the stator 21 and the rotor 22, the connection between the upstream chamber 100 and the downstream chamber 200 is small. This not only easily leads to a throttling effect, resulting in insufficient fluid sent to the scroll compressor chamber and thus reducing the compressor's energy efficiency, but also causes the pressure in the upstream chamber 100 to gradually increase. Consequently, the axial force exerted by the fluid in the upstream chamber 100 on the rotor 22 gradually increases, causing the rotor 22 to move axially relative to the shaft 23 and wear out.

[0047] The electric compressor provided in this embodiment of the present invention increases the connection between the upstream chamber 100 and the downstream chamber 200 by setting multiple cooling through holes 21111 spaced apart on the stator 21. This not only avoids the throttling effect and delivers a sufficient flow of fluid to the scroll compression chamber, thereby effectively ensuring the energy efficiency of the compressor, but also enables the fluid in the upstream chamber 100 to be delivered to the downstream chamber 200 in a timely manner. Compared with the prior art, at the same rotational speed of the rotor 22, the axial force exerted on the rotor 22 by the fluid in the upstream chamber 100 is reduced, which helps to reduce the probability of axial movement of the rotor 22 relative to the shaft 23, thereby reducing the wear of the rotor 22.

[0048] In some embodiments, such as Figures 2 to 5 As shown, the stator 21 also includes a plurality of core teeth 2112 protruding from the inner peripheral wall of the core yoke 2111 and spaced apart along the circumference of the core yoke 2111; cooling through holes 21111 are provided in the core yoke 2111; along the circumference of the stator 21, a tooth groove 2113 is formed between two adjacent core teeth 2112, and the cooling through holes 21111 are located between two adjacent tooth grooves 2113.

[0049] Simulation verification revealed that placing the cooling through-hole 21111 between two adjacent iron core teeth 2112 would hinder the flow of magnetic flux, resulting in excessively high local magnetic density and a significant increase in heat generation, thereby reducing the efficiency of the drive motor 2. Therefore, the cooling through-hole 21111 is placed between two adjacent tooth grooves 2113 to reduce the impact of the opening of the cooling through-hole 21111 on the flow of magnetic flux and ensure that the cooling effect of the drive motor 2 meets the requirements.

[0050] In some embodiments, such as Figure 4 As shown, the ratio between the number of grooves 2113 and the number of cooling through holes 21111 is 3K, where K is an integer greater than or equal to 1. For example, the number of grooves 2113 is 36, the number of cooling through holes 21111 is 4, and K = 3.

[0051] This configuration achieves the goal of minimizing the number of cooling holes 21111 while ensuring the cooling effect of the drive motor 2, thereby reducing the impact of the opening of the cooling holes 21111 on the magnetic flux flow.

[0052] In other embodiments, when the number of tooth grooves 2113 is other values, an optimal K value can be determined by simulation, which will not be listed here.

[0053] For example, multiple cooling through holes 21111 are evenly distributed along the circumference of the stator 21 to improve cooling uniformity.

[0054] In some embodiments, the ratio of the cross-sectional area of ​​the cooling through-hole 21111 to the cross-sectional area of ​​the fluid inlet 11 is Q, where 1 ≤ Q ≤ 25.

[0055] Simulation verification revealed that by optimizing the ratio of the cross-sectional area of ​​the cooling through-hole 21111 to the cross-sectional area of ​​the fluid inlet 11, the throttling effect can be minimized to ensure that the fluid in the upstream chamber 100 is delivered to the downstream chamber 200 in a timely manner.

[0056] In some embodiments, such as Figure 2 and Figure 3 As shown, the stator core 211 includes a plurality of stator laminations 2110, each stator lamination 2110 having a plurality of cooling sub-holes 21101 corresponding one-to-one with a plurality of cooling through holes 21111. The plurality of stator laminations 2110 are stacked along the axial direction of the stator core 211 so that the corresponding cooling sub-holes 21101 are stacked to form cooling through holes 21111. The plurality of stator laminations 2110 are divided into at least two groups along the axial direction of the stator 21, each group of stator laminations 2110 including at least one stator lamination 2110. The projections of the cooling sub-holes 21101 on the same group of stator laminations 2110 on a preset plane completely overlap. The projections of the cooling sub-holes 21101 on the preset plane of at least one adjacent group of stator laminations 2110 partially overlap and partially do not overlap. The preset plane is perpendicular to the axial direction of the stator 21.

[0057] This design increases the contact area between the fluid flowing through the cooling through-hole 21111 and the stator core 211, thereby removing the heat generated during the operation of the stator 21 in a timely manner and improving the cooling effect on the stator 21.

[0058] It should be noted that, as Figure 4 In the embodiment shown, the cooling sub-hole 21101 can be an elliptical hole, such as... Figure 2 In the embodiment shown, the cooling sub-hole 21101 can also be a circular hole. In some other embodiments, the cooling sub-hole 21101 can also be other shapes such as fan-shaped arc holes, etc., which are not specifically limited here.

[0059] In some embodiments, such as Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, for two adjacent sets of stator laminations 2110, where the projections of the cooling sub-holes 21101 on the preset plane partially overlap and partially do not overlap, the central axes of the corresponding cooling sub-holes 21101 on the two sets of stator laminations 2110 are arranged at intervals along the circumference of the stator 21.

[0060] By rotating one set of stator laminations 2110 along the circumference of stator 21 by a certain angle, another set of stator laminations 2110 can be obtained, simplifying the assembly of stator laminations 2110.

[0061] For example, the cooling through hole 21111 extends in a generally wavy shape along the axial direction of the stator 21.

[0062] In other embodiments, for two adjacent sets of stator laminations 2110 where the projections of cooling sub-holes 21101 on a preset plane partially overlap and partially do not overlap, the central axes of the corresponding cooling sub-holes 21101 on the two sets of stator laminations 2110 are arranged radially spaced along the stator 21; for two adjacent sets of stator laminations 2110 where the projections of cooling sub-holes 21101 on a preset plane partially overlap and partially do not overlap, the central axes of the corresponding cooling sub-holes 21101 on the two sets of stator laminations 2110 can also be arranged radially and circumferentially spaced along the stator 21.

[0063] In some other embodiments, the cooling through hole 21111 described above may also be a threaded hole.

[0064] In some embodiments, a first cooling channel 300 is formed between the outer peripheral wall of the stator 21 and the inner peripheral wall of the outer casing 1, and the upstream chamber 100 is connected to the downstream chamber 200 through the first cooling channel 300. The outer periphery of the stator 21 is cooled by the fluid flowing through the first cooling channel 300, and the inner periphery of the stator 21 is cooled by the fluid flowing through the air gap 400. The middle part of the stator 21 is cooled by the fluid flowing through the cooling through hole 21111, thereby achieving cooling of multiple parts of the stator 21 to ensure that the cooling effect of the stator 21 meets the requirements.

[0065] In some embodiments, such as Figure 1As shown, the electric compressor also includes a manifold 3 fixed to the outer casing 1. An oil sump 600 is formed between the end of the manifold 3 facing away from the stator 21 and the inner wall of the outer casing 1. The oil sump 600 is mainly used to hold lubricating oil. An upstream bearing seat 6 is fixed inside the outer casing 1, and the manifold 3 is fixed to the upstream bearing seat 6. One end of the rotating shaft 23 is rotatably connected to the upstream bearing seat 6 via the upstream bearing. A downstream bearing seat 7 is fixed inside the outer casing 1, and the other end of the rotating shaft 23 is rotatably connected to the downstream bearing seat 7 via the downstream bearing. The downstream bearing seat 7 is connected to an oil pipe 5, and a lubricating oil passage communicating with the oil pipe 5 is provided on the downstream bearing seat 7. The oil sump 600 is connected to the downstream chamber 200 through a first cooling channel 300, and the inlet of the oil pipe 5 is located inside the downstream chamber 200.

[0066] In actual use, the axial direction of the stator 21 is basically horizontal. The lubricating oil in the oil sump 600 can enter the upper bearing housing to lubricate the upstream bearing. The lubricating oil in the oil sump 600 enters the downstream chamber 200 through the first cooling channel 300. The lubricating oil in the downstream chamber 200 can enter the interior of the downstream bearing housing 7 through the oil pipe 5 to lubricate the downstream bearing.

[0067] In some embodiments, such as Figure 1 and Figure 7 As shown, one end of the stator 21 is installed inside the collector shroud 3. The end face of the stator 21 near the collector shroud 3 and the inner wall of the collector shroud 3 form an upstream chamber 100. The collector shroud 3 separates the oil sump 600 and the upstream chamber 100, which can reduce the probability of lubricating oil in the oil sump 600 splashing into the stator 21 and the rotor 22.

[0068] A second cooling channel 500 is formed between the outer peripheral wall of the stator 21 and the inner peripheral wall of the collector shroud 3, and the upstream chamber 100 is connected to the downstream chamber 200 through the second cooling channel 500.

[0069] For example, the upstream chamber 100, the second cooling channel 500, the first cooling channel 300 and the downstream chamber 200 are connected in sequence, and the outer periphery of the stator 21 is cooled by the fluid flowing through the first cooling channel 300 and the second cooling channel 500.

[0070] Specifically, along the axial direction of the stator core 211, the opening end face of the flow collector 3 is located between the two axial end faces of the stator core 211, so that the cooling fluid flowing out of the second cooling channel 500 enters the first cooling channel 300 and then enters the downstream chamber 200 through the first cooling channel 300.

[0071] In other embodiments, the upstream chamber 100, the second cooling channel 500, and the downstream chamber 200 can be connected sequentially. Specifically, the opening end face of the flow collector 3 is located in the downstream chamber 200, that is, the entire stator core 211 is completely located in the flow collector 3. At this time, part of the cooling fluid in the upstream chamber 100 enters the second cooling channel 500, and then the cooling fluid in the second cooling channel 500 directly enters the downstream chamber 200.

[0072] In some embodiments, multiple second cooling channels 500 are provided, and the multiple second cooling channels 500 are arranged at equal intervals along the circumference of the stator 21. This arrangement enables cooling of multiple locations in the circumferential direction of the stator 21, improving the uniformity of heat dissipation of the stator 21.

[0073] For example, the second cooling groove 2114 on the outer peripheral wall of the stator 21 extends through the stator 21 along the axial direction. The inner peripheral wall of the shroud 3 is in close contact with the outer peripheral wall of the stator 21, so that the radial opening of the second cooling groove 2114 is blocked by the inner peripheral wall of the shroud 3 to form the second cooling channel 500.

[0074] In other embodiments, a second cooling groove can be formed on the outer peripheral wall of the collector shroud 3. One end of the second cooling groove extends through to the axial end face of the collector shroud 3, and the other end extends out of the stator 21 along the axial direction of the stator 21. The outer peripheral wall of the stator 21 is in close contact with the inner peripheral wall of the collector shroud 3, so that the radial opening of the second cooling groove is blocked by the outer peripheral wall of the stator, forming the aforementioned second cooling channel 500. Alternatively, second cooling grooves 2114 with opposing openings can be provided on the outer peripheral wall of the collector shroud 3 and the outer peripheral wall of the stator 21. The outer peripheral wall of the stator 21 is in close contact with the inner peripheral wall of the collector shroud 3, so that the second cooling grooves 2114 with opposing openings form the aforementioned second cooling channel 500.

[0075] In some embodiments, such as Figure 1 As shown, the flow collector 3 has an air intake hole 31 that is directly opposite the fluid inlet 11. The air intake hole 31 is connected to the fluid inlet 11 so that external fluid can enter the upstream chamber 100 through the fluid inlet 11 and the air intake hole 31.

[0076] In some embodiments, such as Figure 1 As shown, the electric compressor also includes a flow guide shroud 4, which is used to guide the fluid flowing out of the cooling through hole 21111 to the stator winding 212 extending axially along the stator core 211, so as to cool the stator winding 212 extending from the end of the stator core 211 and improve the cooling effect on the stator 21.

[0077] In some embodiments, such as Figure 1As shown, the flow guide shroud 4 is located in the downstream chamber 200, dividing the downstream chamber 200 into a flow guide cavity 210 and a connecting cavity 220. One end of the stator 21 is located inside the flow guide shroud 4, so that the end face of the stator 21 away from the upstream chamber 100 and the inner wall of the flow guide shroud 4 form the flow guide cavity 210. The flow guide cavity 210 is connected to the cooling through hole 21111 and the air gap 400. The bottom wall of the flow guide shroud 4 is provided with a connecting hole 41 connecting the flow guide cavity 210 and the connecting cavity 220. The stator 21 also includes a stator winding 212 wound on the stator core 211. Along the radial direction of the stator 21, the outermost part of the stator winding 212 is located between the cooling through hole 21111 and the connecting hole 41.

[0078] This configuration allows the fluid entering the guide cavity 210 through the cooling through hole 21111. Since the outermost part of the stator winding 212 is located between the cooling through hole 21111 and the connecting hole 41 along the radial direction of the stator 21, the fluid in the guide cavity 210 will flow inward along the radial direction of the stator 21, and then flow into the connecting cavity 220 through the connecting hole 41. This guides the fluid flowing out of the cooling through hole 21111 to the stator winding 212 extending from the end of the stator core 211, thereby cooling the stator winding 212 extending from the end of the stator core 211 and improving the cooling effect on the drive motor 2.

[0079] In some other embodiments, the flow guide shroud 4 may also adopt a bottomless sleeve structure, with the aforementioned flow guide surface 42 formed on the inner wall of one end of the sleeve structure.

[0080] In some embodiments, such as Figure 1 As shown, the inner peripheral wall of the flow guide shroud 4 has a flow guide surface 42, which gradually approaches the central axis of the stator 21 from the upstream chamber 100 to the downstream chamber 200. In other words, one end of the flow guide shroud 4 has a tapered hole, and the inner wall of the tapered hole forms the aforementioned flow guide surface 42. This arrangement facilitates the flow of fluid entering the flow guide cavity 210 through the cooling through hole 21111, which, under the guidance of the flow guide surface 42, gradually approaches the stator winding 212 extending from the end of the stator core 211, thereby cooling the stator winding 212 extending from the end of the stator core 211.

[0081] For example, the guide surface 42 is a conical surface with a gradually decreasing inner diameter from the upstream chamber 100 to the downstream chamber 200.

[0082] In some embodiments, such as Figure 1As shown, the electric compressor also includes an outer casing 10, which is located outside and connected to the outer casing 1. An outer flow channel 700 is formed between the outer casing 10 and the outer casing 1. The outer casing 1 has a first hole 12 and a second hole 13. The connecting cavity 220 is connected to the outer flow channel 700 through the first hole 12, and the outer flow channel 700 is connected to the inlet of the scroll compression chamber through the second hole 13. This arrangement connects the connecting cavity 220 to the inlet of the scroll compression chamber.

[0083] Specifically, the outer casing 10 is sealed and fixed to the outer wall of the outer casing 1, so that the outer casing 10 and the outer casing 1 form the aforementioned outflow channel 700. As for the method of achieving the sealed connection between the outer casing 10 and the outer casing 1, it can be welding, adhesive fixing, etc., which will not be specifically limited here.

[0084] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An electric compressor, comprising a scroll compressor assembly, a housing (1), and a drive motor (2) disposed within the housing (1), the drive motor (2) comprising a stator (21) and a rotor (22) rotatably passing through the stator (21), the inner cavity of the housing (1) comprising an upstream chamber (100) and a downstream chamber (200) respectively located at both axial ends of the stator (21), the scroll compressor assembly being located within the downstream chamber (200), the upstream chamber (100) having a fluid inlet (11) disposed on the housing (1); characterized in that, The stator core (211) of the stator (21) includes a core yoke (2111), and the core yoke (2111) is provided with a plurality of cooling through holes (21111) arranged at intervals. The cooling through holes (21111) are configured to connect the upstream chamber (100) and the downstream chamber (200).

2. The electric compressor according to claim 1, characterized in that, The stator core (211) further includes a plurality of core teeth (2112) protruding from the inner peripheral wall of the core yoke (2111) and spaced apart circumferentially along the core yoke (2111). Along the circumferential direction of the stator (21), a tooth groove (2113) is formed between two adjacent iron core teeth (2112), and the cooling through hole (21111) is located between two adjacent tooth grooves (2113).

3. The electric compressor according to claim 2, characterized in that, The ratio between the number of the toothed grooves (2113) and the number of the cooling through holes (21111) is 3K, where K is an integer greater than or equal to 1; And / or, the ratio of the cross-sectional area of ​​the cooling through hole (21111) to the cross-sectional area of ​​the fluid inlet (11) is Q, 1≤Q≤25.

4. The electric compressor according to claim 1, characterized in that, The stator core (211) includes a plurality of stator laminations (2110), each stator lamination (2110) being provided with a plurality of cooling sub-holes (21101) corresponding one-to-one with the plurality of cooling through holes (21111), the plurality of stator laminations (2110) being stacked along the axial direction of the stator core (211) so that the corresponding cooling sub-holes (21101) are stacked to form the cooling through holes (21111); The stator laminations (2110) are divided into at least two groups along the axial direction of the stator (21). Each group of stator laminations (2110) includes at least one stator lamination (2110). The projections of the cooling sub-holes (21101) on the stator laminations (2110) in the same group completely overlap on a preset plane. The projections of the cooling sub-holes (21101) on the preset plane of at least two adjacent groups of stator laminations (2110) partially overlap and partially do not overlap. The preset plane is perpendicular to the axial direction of the stator (21).

5. The electric compressor according to claim 4, characterized in that, For two adjacent sets of stator laminations (2110) whose projections of the cooling sub-holes (21101) on the preset plane partially overlap and partially do not overlap, the central axes of the corresponding cooling sub-holes (21101) on the two sets of stator laminations (2110) are arranged circumferentially and / or radially at intervals along the stator (21).

6. The electric compressor according to claim 1, characterized in that, The cooling through hole (21111) is a threaded hole.

7. The electric compressor according to any one of claims 1 to 6, characterized in that, A first cooling channel (300) is formed between the inner peripheral wall of the outer casing (1) and the outer peripheral wall of the stator (21), and the upstream chamber (100) is connected to the downstream chamber (200) through the first cooling channel (300).

8. The electric compressor according to claim 7, characterized in that, The electric compressor also includes a manifold (3), one end of the stator (21) is installed inside the manifold (3), and the end face of the stator (21) near the manifold (3) and the inner wall of the manifold (3) form the upstream chamber (100); A second cooling channel (500) is formed between the outer peripheral wall of the stator (21) and the inner peripheral wall of the collector shroud (3), and the upstream chamber (100) is connected to the downstream chamber (200) through the second cooling channel (500).

9. The electric compressor according to any one of claims 1 to 6, characterized in that, The electric compressor also includes a flow guide (4) for directing the fluid flowing out of the cooling through hole (21111) to the stator winding (212) extending axially along the stator core (211).

10. The electric compressor according to claim 9, characterized in that, The flow guide (4) has a flow guide surface (42) that gradually approaches the central axis of the stator (21) in the direction from the upstream chamber (100) to the downstream chamber (200).

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