Stator structure and compressor

Abstract

This invention discloses a stator structure and a compressor. The stator structure includes a stator core extending along a predetermined axis. The stator core includes an outer peripheral surface for connecting with the compressor housing, and includes a receiving hole within the stator core. The groove structure includes: a first groove disposed on the stator core, the inner wall of which extends from the outer peripheral surface towards the receiving hole; a second groove disposed on the stator core, the inner wall of which extends from the bottom of the first groove towards the receiving hole; and a third groove disposed on the stator core, the inner wall of which extends from the bottom of the second groove towards the receiving hole. This stator structure solves the problem in the prior art where the motor performance of the compressor is affected by the stator structure.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more specifically, to a stator structure and a compressor. Background Technology

[0002] The compressor motor stator is assembled in the compressor housing. The outer circle of the stator needs to have sufficient contact area with the inner wall of the compressor housing to ensure that the stator is fixed in position after the heat-shrink fitting. However, the outer circle of the stator also needs to have a truncated edge structure to ensure the flow of refrigerant, and cannot be a perfect circle.

[0003] However, the shape of the outer circumference of the stator in existing compressors affects the core stress after the stator is heat-shrink, leading to excessive iron losses in the motor and consequently affecting motor efficiency. Furthermore, the typical stator circumference structure results in uneven thickness in the stator yoke, leading to uneven magnetic circuitry in the stator yoke and impacting motor performance. Summary of the Invention

[0004] The main objective of this invention is to provide a stator structure and compressor to solve the problem that the motor performance of compressors in the prior art is affected by the structure of the stator.

[0005] To achieve the above objectives, the present invention provides a stator structure, comprising: a stator core extending along a predetermined axis, the stator core including an outer peripheral surface for connection with the housing of a compressor, and a receiving hole within the stator core; and a groove structure comprising: a first groove disposed on the stator core, the inner wall surface of the first groove extending from the outer peripheral surface toward the receiving hole; a second groove disposed on the stator core, the inner wall surface of the second groove extending from the bottom of the first groove toward the receiving hole; and a third groove disposed on the stator core, the inner wall surface of the third groove extending from the bottom of the second groove toward the receiving hole.

[0006] Furthermore, the third groove includes: a first forming groove, the inner wall surface of which extends from the bottom of the second groove toward the receiving hole of the second groove; and a second forming groove, the inner wall surface of which extends from the bottom of the first forming groove toward the receiving hole of the first forming groove.

[0007] Furthermore, the stator core includes a connecting part for connecting with the compressor housing. The connecting part is an annular structure with a preset axis as its axis. A groove structure is located on the connecting part. Multiple connecting teeth are provided on the inner side of the connecting part at intervals. A receiving hole is located on the side of the connecting teeth away from the connecting part.

[0008] Furthermore, the groove structure is a symmetrical structure with a preset plane as the plane of symmetry; the connecting part is a symmetrical structure with a preset plane as the plane of symmetry; wherein, the preset axis is located on the plane of symmetry.

[0009] Furthermore, the maximum thickness of the connecting part is L, the extension direction of the outer peripheral surface is parallel to the extension direction of the bottom of the first groove, and the maximum distance between the outer peripheral surface and the bottom of the first groove is L4; wherein, 0.05≤L4 / L≤0.2.

[0010] Furthermore, the extension direction of the bottom of the second groove is parallel to the extension direction of the bottom of the first groove, and the maximum distance between the bottom of the second groove and the bottom of the first groove is L3; wherein, 0.05≤L3 / L≤0.2.

[0011] Furthermore, the extension direction of the bottom of the first trough is parallel to the extension direction of the bottom of the second groove, and the maximum distance between the bottom of the first trough and the bottom of the second groove is L2; ​​wherein, 0.05≤L2 / L≤0.2.

[0012] Furthermore, the maximum distance between the bottom of the first component tank and the bottom of the second component tank is L1; where 0.15≤L1 / L≤0.25.

[0013] Furthermore, a core groove is provided between two adjacent connecting teeth, and the cross-sectional area of ​​the core groove along the extension direction of the preset axis is S; wherein, along the extension direction of the preset axis, the cross-sectional area of ​​the first groove is S4; 0.04≤S4 / S≤0.08; and / or, the cross-sectional area of ​​the second groove is S3; 0.04≤S3 / S≤0.08; and / or, the cross-sectional area of ​​the first component groove is S2; 0.04≤S2 / S≤0.08; and / or, the cross-sectional area of ​​the first component groove is S1; 0.02≤S1 / S≤0.05.

[0014] Furthermore, there are multiple groove structures, which are arranged at intervals around the outer peripheral surface.

[0015] The present invention provides a compressor, including a stator structure, wherein the stator structure is as described above.

[0016] Applying the technical solution of this invention, the stator structure includes a stator core extending along a predetermined axis. The stator core includes an outer peripheral surface for connection with the compressor housing, and a receiving hole within the stator core. The groove structure includes: a first groove disposed on the stator core, the inner wall of which extends from the outer peripheral surface towards the receiving hole; a second groove disposed on the stator core, the inner wall of which extends from the bottom of the first groove towards the receiving hole; and a third groove disposed on the stator core, the inner wall of which extends from the bottom of the second groove towards the receiving hole. By adopting the above configuration, the groove structure is composed of a first groove, a second groove, and a third groove. After the motor stator is heat-fitted, the groove structure of the stator core becomes more uniform, minimizing the impact of the groove structure on motor performance. This results in a more uniform magnetic circuit in the stator yoke, with virtually no abrupt changes in the magnetic reluctance of the stator structure, ensuring motor performance and solving the problem of low operating efficiency in the stator structure of existing compressors. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the first embodiment of the stator structure of the present invention;

[0018] Figure 2 for Figure 1 A partially enlarged view of part A of the stator structure;

[0019] Figure 3 This is a schematic diagram of the second embodiment of the stator structure of the present invention;

[0020] Figure 4 for Figure 3 A partially enlarged view of part B of the stator structure;

[0021] Figure 5 This is a schematic diagram of the third embodiment of the stator structure of the present invention;

[0022] Figure 6 for Figure 5 A partially enlarged view of section C of the stator structure;

[0023] Figure 7 This is a schematic diagram of the fourth embodiment of the stator structure of the present invention;

[0024] Figure 8 for Figure 7 A magnified view of part D of the stator structure.

[0025] In the figure: 1. Stator core; 101. Connecting part; 102. Connecting tooth; 103. Core groove; 11. Outer circumferential surface; 12. Receiving hole; 21. First groove; 22. Second groove; 23. Third groove; 231. First component groove; 232. Second component groove. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments in this application, other similar embodiments obtained by those skilled in the art without creative effort should all fall within the scope of protection of this application. Furthermore, directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the directions in the accompanying drawings; therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0027] The following is in conjunction with the appendix Figure 1 The present invention will be further illustrated in the figures.

[0028] The stator structure of this embodiment includes: a stator core 1 extending along a preset axis, the stator core 1 including an outer peripheral surface 11 for connecting with the compressor housing, and a receiving hole 12 inside the stator core 1; and a groove structure including: a first groove 21 disposed on the stator core 1, the inner wall surface of the first groove 21 extending from the outer peripheral surface 11 toward the receiving hole 12; a second groove 22 disposed on the stator core 1, the inner wall surface of the second groove 22 extending from the bottom of the first groove 21 toward the receiving hole 12; and a third groove 23 disposed on the stator core 1, the inner wall surface of the third groove 23 extending from the bottom of the second groove 22 toward the receiving hole 12. By adopting the above configuration, the groove structure is composed of the first groove 21, the second groove 22, and the third groove 23, making the groove structure of the stator core 1 more uniform after the motor stator is heat-fitted, thus minimizing the impact of the groove structure configuration on motor performance. This makes the magnetic circuit of the stator yoke more uniform, and the magnetic reluctance of the stator structure is basically without abrupt changes, ensuring the performance of the motor and solving the problem that the motor performance of the compressor in the prior art is affected by the structure of the stator.

[0029] It should be noted that in the stator structure, a truncated edge structure is provided on the outer circumference of the stator core 1, thereby forming a groove structure. This ensures that the circumference of the stator's circular edge is sufficient for the heat-fitting process between the motor stator and the inner wall of the compressor housing, thus guaranteeing the heat-fitting strength. It also ensures a refrigerant flow channel between the stator structure and the compressor housing. However, the groove structure can affect the structural uniformity of the stator core 1, thereby impacting the stator's performance. In this embodiment, the groove structure is further refined and decomposed by the first groove 21, the second groove 22, and the third groove 23, resulting in a more uniform stator structure and virtually no abrupt changes in the stator magnetic circuit reluctance, thus ensuring motor performance.

[0030] Specifically, a groove structure is typically provided between the stator structure and the compressor housing to allow refrigerant flow. However, the placement of this groove structure affects the uniformity of the stator core 1's structure. If the number of grooves is too small, the cut areas of the stator core 1 will be thinner than the uncut areas, resulting in uneven stress after heat fitting, high iron loss, and low efficiency. In this embodiment, multiple concave edges are machined on the stator structure to form multiple grooves. Setting the groove structure as a combination of multiple grooves reduces the risk of uneven groove structure.

[0031] See Figures 4 to 8 In the stator structure of this embodiment, the third groove 23 includes: a first component groove 231, the inner wall surface of which extends from the bottom of the second groove 22 toward the second groove 22 near the receiving hole 12; and a second component groove 232, the inner wall surface of which extends from the bottom of the first component groove 231 toward the first component groove 231 near the receiving hole 12.

[0032] In some embodiments, the third groove 23 can be configured as an integral groove structure, such as... Figures 1 to 4 As shown, it can also be configured as a two-layer groove consisting of a first constituent groove 231 and a second constituent groove 232, such as... Figures 5 to 8 As shown, the groove structure has 3 to 4 grooves, and each layer of grooves is recessed inward from the outer circle of the stator towards the center of the stator. This avoids the phenomenon of uneven cutting of the stator core yoke caused by too few cut edges in the groove structure.

[0033] Specifically, if there are too many cut edges in the groove structure, it will make the high-pressure stamping mold for stamping the motor core more complex, with high mold cost and high process difficulty. Therefore, the number of grooves is set to 3 to 4, which controls the cost while ensuring the efficiency of the motor.

[0034] See Figures 1 to 8In the stator structure of this embodiment, the stator core 1 includes a connecting part 101 for connecting with the housing of the compressor. The connecting part 101 is an annular structure with a preset axis as the axis. A groove structure is located on the connecting part 101. A plurality of connecting teeth 102 are provided on the inner side of the connecting part 101 at intervals. The receiving hole 12 is located on the side of the connecting teeth 102 away from the connecting part 101.

[0035] In the stator structure of this embodiment, see Figures 1 to 8 The groove structure is a symmetrical structure with a preset plane as the plane of symmetry; the connecting part 101 is a symmetrical structure with a preset plane as the plane of symmetry; wherein, the preset axis is located on the plane of symmetry.

[0036] See Figure 1 , Figure 6 In the stator structure of this embodiment, the maximum thickness of the connecting part 101 is L, the extension direction of the outer peripheral surface 11 is parallel to the extension direction of the bottom of the first groove 21, and the maximum distance between the outer peripheral surface 11 and the bottom of the first groove 21 is L4; wherein, 0.05≤L4 / L≤0.2.

[0037] See Figure 1 , Figure 6 In the stator structure of this embodiment, the extension direction of the bottom of the second groove 22 is parallel to the extension direction of the bottom of the first groove 21, and the maximum distance between the bottom of the second groove 22 and the bottom of the first groove 21 is L3; wherein, 0.05≤L3 / L≤0.2.

[0038] See Figure 6 In the stator structure of this embodiment, the extension direction of the bottom of the first component groove 231 is parallel to the extension direction of the bottom of the second groove 22, and the maximum distance between the bottom of the first component groove 231 and the bottom of the second groove 22 is L2; ​​wherein, 0.05≤L2 / L≤0.2.

[0039] See Figure 6 In the stator structure of this embodiment, the maximum distance between the bottom of the first component slot 231 and the bottom of the second component slot 232 is L1; wherein, 0.15≤L1 / L≤0.25.

[0040] Specifically, Figure 1 In this context, L represents the thickness of the yoke portion of stator core 1. Figure 2 , Figure 6In this diagram, L1 represents the radial depth of the innermost groove, L2 represents the radial depth of the second groove from the inside out, L3 represents the radial depth of the third groove from the inside out, and L4 represents the radial depth of the fourth groove from the inside out. In this embodiment, setting 0.15≤L1 / L≤0.25, 0.05≤L2 / L≤0.2, 0.05≤L3 / L≤0.2, and 0.05≤L4 / L≤0.2 achieves better results.

[0041] See Figure 1 , Figure 6 In the stator structure of this embodiment, there is a core groove 103 between two adjacent connecting teeth 102. The cross-sectional area of ​​the core groove 103 along the extension direction of the preset axis is S. Among them, the cross-sectional area of ​​the first groove 21 along the extension direction of the preset axis is S4; 0.04≤S4 / S≤0.08; and / or, the cross-sectional area of ​​the second groove 22 is S3; 0.04≤S3 / S≤0.08; and / or, the cross-sectional area of ​​the first component groove 231 is S2; 0.04≤S2 / S≤0.08; and / or, the cross-sectional area of ​​the second component groove 232 is S1; 0.02≤S1 / S≤0.05.

[0042] Specifically, Figure 1 In this diagram, S represents the cross-sectional area of ​​the stator core slot 103, S1 represents the cross-sectional area of ​​the innermost slot, S2 represents the cross-sectional area of ​​the second slot from the inside out, S3 represents the cross-sectional area of ​​the third slot from the inside out, and S4 represents the cross-sectional area of ​​the fourth slot from the inside out. The values ​​are set to 0.02≤S1 / S≤0.05, 0.04≤S2 / S≤0.08, 0.04≤S3 / S≤0.08, and 0.04≤S4 / S≤0.08. This ensures the uniformity of the slot structure, resulting in a more uniform magnetic circuit generated by the stator core 1, more uniform stress on the stator core 1, and higher working efficiency of the stator core 1.

[0043] See Figure 1 , Figure 6 In the stator structure of this embodiment, there are multiple groove structures, which are arranged at intervals around the outer peripheral surface 11.

[0044] The compressor in this embodiment includes a stator structure, which is the stator structure described above.

[0045] The embodiments of the present invention are described below:

[0046] Example 1:

[0047] See Figure 1 , Figure 2In this embodiment, the groove structure of the stator core 1 includes a first groove 21, a second groove 22 and a third groove 23. The first groove 21, the second groove 22 and the third groove 23 are distributed sequentially along the outer surface of the stator core 1 towards the axis of the stator core 1.

[0048] Example 2:

[0049] See Figure 2 In this embodiment, at least a portion of the bottom of the third groove 23 is an arc-shaped surface.

[0050] Example 3:

[0051] See Figure 4 In this embodiment, at least a portion of the bottom of the third groove 23 is a plane.

[0052] Example 4:

[0053] See Figure 6 In this embodiment, the third groove 23 is composed of a first component groove 231 and a second component groove 232, with the second component groove 232 located on the side of the first component groove 231 near the axis of the stator core 1. The bottom of the second component groove 232 can be an arc-shaped surface or a flat surface.

[0054] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0055] The stator structure of the present invention includes a stator core 1 extending along a predetermined axis. The stator core 1 includes an outer peripheral surface 11 for connection with the compressor housing, and a receiving hole 12 inside the stator core 1. The groove structure includes: a first groove 21 disposed on the stator core 1, the inner wall of the first groove 21 extending from the outer peripheral surface 11 towards the receiving hole 12; a second groove 22 disposed on the stator core 1, the inner wall of the second groove 22 extending from the bottom of the first groove 21 towards the receiving hole 12; and a third groove 23 disposed on the stator core 1, the inner wall of the third groove 23 extending from the bottom of the second groove 22 towards the receiving hole 12. By adopting the above configuration, the groove structure is composed of the first groove 21, the second groove 22, and the third groove 23, making the groove structure of the stator core 1 more uniform after the motor stator is heat-fitted, thus minimizing the impact of the groove structure on motor performance. This makes the magnetic circuit of the stator yoke more uniform, and the magnetic reluctance of the stator structure is basically without abrupt changes, ensuring the performance of the motor and solving the problem that the motor performance of the compressor in the prior art is affected by the structure of the stator.

[0056] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A stator structure, characterized in that, include: The stator core (1) extends along a preset axis and includes an outer peripheral surface (11) for connecting with the housing of the compressor. The stator core (1) includes a receiving hole (12). The groove structure includes: The first groove (21) is provided on the stator core (1), and the inner wall surface of the first groove (21) extends from the outer peripheral surface (11) toward the receiving hole (12) of the outer peripheral surface (11); The second groove (22) is provided on the stator core (1), and the inner wall surface of the second groove (22) extends from the bottom of the first groove (21) toward the first groove (21) near the receiving hole (12); The third groove (23) is provided on the stator core (1), and the inner wall surface of the third groove (23) extends from the bottom of the second groove (22) toward the second groove (22) near the receiving hole (12); The stator core (1) includes a connecting part (101) for connecting with the housing of the compressor. The connecting part (101) is an annular structure with the preset axis as the axis. The groove structure is located on the connecting part (101). A plurality of connecting teeth (102) are provided on the inner side of the connecting part (101) at intervals. The receiving hole (12) is located on the side of the connecting teeth (102) away from the connecting part (101). The maximum thickness of the connecting part (101) is L, the extension direction of the outer peripheral surface (11) is parallel to the extension direction of the bottom of the first groove (21), and the maximum distance between the outer peripheral surface (11) and the bottom of the first groove (21) is L4; wherein, 0.05≤L4 / L≤0.2; The extension direction of the bottom of the second groove (22) is parallel to the extension direction of the bottom of the first groove (21), and the maximum distance between the bottom of the second groove (22) and the bottom of the first groove (21) is L3; wherein, 0.05≤L3 / L≤0.2; There is a core groove (103) between two adjacent connecting teeth (102), and the area of ​​the cross-section of the core groove (103) along the extension direction of the preset axis is S; wherein, the area of ​​the cross-section of the first groove (21) along the extension direction of the preset axis is S4; 0.04≤S4 / S≤0.

08.

2. The stator structure according to claim 1, characterized in that, The third groove (23) includes: The first component groove (231) has an inner wall surface that extends from the bottom of the second groove (22) toward the second groove (22) and closer to the receiving hole (12). The second component groove (232) extends from the bottom of the first component groove (231) toward the receiving hole (12) of the first component groove (231).

3. The stator structure according to claim 1, characterized in that, The groove structure is a symmetrical structure with a preset plane as the plane of symmetry; the connecting part (101) is a symmetrical structure with the preset plane as the plane of symmetry; wherein, the preset axis is located on the plane of symmetry.

4. The stator structure according to claim 3, characterized in that, The bottom of the first component groove (231) extends in a direction parallel to the bottom of the second groove (22), and the maximum distance between the bottom of the first component groove (231) and the bottom of the second groove (22) is L2; ​​wherein, 0.05≤L2 / L≤0.

2.

5. The stator structure according to claim 4, characterized in that, The maximum distance between the bottom of the first component groove (231) and the bottom of the second component groove (232) is L1; wherein, 0.15≤L1 / L≤0.

25.

6. The stator structure according to claim 1, characterized in that, Along the extension direction of the preset axis, The cross-sectional area of ​​the groove body of the second groove (22) is S3; 0.04≤S3 / S≤0.08; and / or, The cross-sectional area of ​​the first component groove (231) is S2; 0.04≤S2 / S≤0.08; and / or, The cross-sectional area of ​​the second component groove (232) is S1; 0.02≤S1 / S≤0.

05.

7. The stator structure according to claim 1, characterized in that, The groove structure is multiple, and the multiple groove structures are arranged at intervals around the outer peripheral surface (11).

8. A compressor, comprising a stator structure, characterized in that, The stator structure is the stator structure according to any one of claims 1 to 7.

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