Stator laminations, stators, motors, compressors and refrigeration equipment

Abstract

The utility model discloses a stator punching sheet, a stator, a motor, a compressor and a refrigeration device, and relates to the technical field of motors, wherein the stator punching sheet comprises a stator yoke and a plurality of stator teeth, and the plurality of stator teeth are arranged at intervals on the inner side of the stator yoke; wherein the outer peripheral surface of the stator yoke comprises a plurality of first outer walls and a plurality of second outer walls which are arranged alternately, and the first outer walls and the second outer walls are connected by an oil return recess; a first rivet hole is arranged on the stator yoke corresponding to the first outer wall, and the first rivet hole is located on the first center line of the stator tooth corresponding to the first outer wall, and in the radial direction of the stator punching sheet, the minimum distance between the first rivet hole and the outer peripheral edge of the stator yoke is d1, 2t≤d1, and t is the thickness of the stator punching sheet; the technical solution provided by the utility model can reduce the eddy current loss of the stator and ensure the structural strength of the stator at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a stator punching sheet, a stator, a motor, a compressor and a refrigeration device. Background Art

[0002] The motor includes a rotor and a stator used in conjunction with the rotor, wherein the stator includes a plurality of stator punching sheets, which are stacked and connected together by rivets. However, due to the arrangement of the rivets, eddy currents are generated inside the rivets, resulting in high eddy current losses of the stator. In order to reduce the eddy current losses of the stator, the prior art adopts a solution of reducing the number of rivets, which results in reduced structural strength of the stator. Utility Model Content

[0003] The main purpose of the utility model is to provide a stator punching sheet, a stator, a motor, a compressor and a refrigeration device, aiming at reducing the eddy current loss of the stator and ensuring the structural strength of the stator.

[0004] In order to achieve the above-mentioned purpose, the stator punching sheet proposed by the utility model comprises:

[0005] a stator yoke; and

[0006] A plurality of stator teeth are arranged at intervals on the inner side of the stator yoke;

[0007] Wherein, the outer peripheral surface of the stator yoke includes a plurality of first outer walls and a plurality of second outer walls which are arranged alternately, and the first outer walls and the second outer walls are connected by an oil return recess;

[0008] A first rivet hole is provided on the stator yoke corresponding to the first outer wall, and the first rivet hole is located on the first center line of the stator tooth corresponding to the first outer wall. In the radial direction of the stator punching sheet, the minimum distance between the first rivet hole and the outer periphery of the stator yoke is d1, 2t≤d1, and t is the thickness of the stator punching sheet.

[0009] In one embodiment, a length of the first rivet hole in the radial direction of the stator punching sheet is c, a width of the first rivet hole is b, and b≤c≤2d1.

[0010] In one embodiment, the first rivet hole is configured as a square hole and extends in a radial direction of the stator punching sheet.

[0011] In one embodiment, a second rivet hole is provided on the stator yoke portion corresponding to the oil return recess, and the second rivet hole is located on a second center line of the stator tooth portion corresponding to the oil return recess.

[0012] In one embodiment, in the radial direction of the stator punching sheet, the minimum distance between the second rivet hole and the outer periphery of the stator yoke is d2, and 2t≤d2<d1.

[0013] In one embodiment, the number of the first rivet holes is Q1, the number of the second rivet holes is Q2, and Q1≥Q2.

[0014] In one embodiment, the second rivet hole is configured as a round hole or a square hole.

[0015] In one embodiment, the central angle corresponding to the first outer wall is a, 360 / N<a<360 / C, N is the number of stator teeth of the stator punching sheet, and C is the greatest common divisor of the number of stator teeth and the number of rotor poles.

[0016] In one embodiment, a distance from the first outer wall to the center of the stator punching sheet is D1, a distance from the second outer wall to the center of the stator punching sheet is D2, and D1≥D2.

[0017] The utility model also provides a stator, which comprises the stator punching sheet as described above.

[0018] The utility model also provides a motor, which comprises the stator as described above.

[0019] The utility model also provides a compressor, which comprises the stator as described above, or the motor as described above.

[0020] The utility model also provides a refrigeration device, which comprises the motor as described above, or the compressor as described above.

[0021] In the technical solution of the utility model, a first rivet hole is arranged on the stator yoke, wherein the first rivet hole is arranged corresponding to the first outer wall and is located on the first center line of the stator yoke corresponding to the first outer wall, so that the first rivet hole is symmetrically arranged about the first center line and away from the connection between the stator tooth portion and the stator yoke portion, thereby reducing the eddy current loss caused by the magnetic line passing through the first rivet hole, and because the minimum distance d1 between the first rivet hole and the first outer wall satisfies: 2t≤d1, t is the thickness of the stator punching sheet, the structural strength of the stator punching sheet can be reliably guaranteed, thereby improving the overall structural strength of the stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 A structural schematic diagram of an embodiment of a stator punching sheet provided by the utility model;

[0024] Figure 2 A schematic structural diagram of an embodiment of a compressor provided by the utility model;

[0025] Figure 3 This is a comparison diagram of the optimization effects of the compressor of the utility model and the existing solution;

[0026] Figure 4 Schematic diagram of magnetic field line distribution at the first rivet hole;

[0027] Figure 5 It is a schematic diagram of the magnetic field line distribution on the stator punching sheet at a certain moment;

[0028] Figure 6 Schematic diagram of magnetic field line distribution on stator punching sheet;

[0029] Figure 7 This is a schematic structural diagram of an embodiment of a rotor punching provided by the utility model.

[0030] Description of Figure Numbers:

[0031] 100, stator; 10, stator punching sheet; 11, stator yoke; 111, first outer wall; 112, second outer wall; 113, oil return concave portion; 12, stator tooth portion; 121, first center line; 122, second center line; 13, first rivet hole; 14, second rivet hole;

[0032] 200, rotor; 20, rotor punching; 21, magnetic steel slot; 211, skew slot section; 22, third rivet hole; 23, fourth rivet hole; 24, third center line; 25, fourth center line; 26, flow hole;

[0033] 1000, compressor; 101, crankshaft; 102, main bearing; 103, cylinder; 104, piston; 105, auxiliary bearing.

[0034] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0038] The motor includes a rotor 200 and a stator 100 used in conjunction with the rotor 200, wherein the stator 100 includes a plurality of stator punching sheets 10, which are stacked and connected together by rivets. However, due to the arrangement of the rivets, eddy currents are generated inside the rivets, resulting in high eddy current losses of the stator 100. In order to reduce the eddy current losses of the stator 100, the prior art adopts a solution of reducing the number of rivets, which results in reduced structural strength of the stator 100.

[0039] In order to solve the technical problem, the utility model proposes a stator 100, wherein a plurality of stator punching sheets 10 of the stator 100 are connected together by rivets, wherein the stator 100 adopts a stator punching sheet 10 proposed in the utility model.

[0040] See also Figures 1 to 6In one embodiment of the utility model, the stator punching sheet 10 includes a stator yoke 11 and a plurality of stator teeth 12, and the plurality of stator teeth 12 are arranged at intervals on the inner side of the stator yoke 11; wherein the outer peripheral surface of the stator yoke 11 includes a plurality of first outer walls 111 and a plurality of second outer walls 112 arranged alternately, and the first outer walls 111 and the second outer walls 112 are connected by an oil return recess 113; a first rivet hole 13 is provided on the stator yoke 11 corresponding to the first outer wall 111, and the first rivet hole 13 is located on the first center line 121 of the stator tooth 12 corresponding to the first outer wall 111, and in the radial direction of the stator punching sheet 10, the minimum distance between the first rivet hole 13 and the outer peripheral edge of the stator yoke 11 is d1, 2t≤d1, and t is the thickness of the stator punching sheet 10; so as to improve the eddy current loss of the stator 100, thereby improving the energy efficiency of the motor or compressor 1000.

[0041] In the technical solution of the utility model, a first rivet hole 13 is arranged on the stator yoke 11, wherein the first rivet hole 13 is arranged corresponding to the first outer wall 111, and is located on the first center line 121 of the stator yoke 11 corresponding to the first outer wall 111, so that the first rivet hole 13 is symmetrically arranged about the first center line 121, and is away from the connection between the stator tooth portion 12 and the stator yoke 11, so that the eddy current loss caused by the magnetic line passing through the first rivet hole 13 can be reduced, and because the minimum distance d1 between the first rivet hole 13 and the first outer wall 111 satisfies: 2t≤d1, t is the thickness of the stator punching sheet 10, the structural strength of the stator punching sheet 10 can be reliably guaranteed, thereby improving the overall structural strength of the stator 100.

[0042] Specifically, the first outer wall 111 of the stator yoke 11 is used to connect the housing, so that the radial thickness of the stator yoke 11 corresponding to the first outer wall 111 is larger in the stator sheet 10, and the risk of fracture due to being too close to the first outer wall 111 is reduced by limiting the minimum distance d1 between the outer contour of the first rivet hole 13 and the first outer wall 111. In this way, it is convenient to set the first rivet hole 13 on the stator yoke 11 without affecting the structural strength of the stator sheet 10, and the first rivet hole 13 is for the rivet to pass through; and the plurality of stator teeth 12 are arranged along the circumferential direction of the stator sheet 10. The stator teeth 12 are arranged at intervals on the inner side of the stator yoke 11, and the stator yoke 11 and the two adjacent stator teeth 12 define a wire gap for the wire of the stator 100 winding to pass through; so that the magnetic density on the stator teeth 12 is high and the magnetic density outside the stator teeth 12 is low. Then, by setting the first rivet hole 13 on the stator yoke 11, and the first rivet hole 13 is symmetrically arranged about the first center line 121, the eddy current loss at the first rivet hole 13 can be minimized without affecting the direction of the magnetic lines of force, without reducing the number of rivets, ensuring that the stator 100 has a better structural strength. The first center line 121 passes through the rotation center of the stator punching 10. The housing can be a motor housing or a compressor 1000 housing.

[0043] A plurality of oil return recesses 113 are formed on the outer side of the stator sheet 10. For the stator 100, the plurality of oil return recesses 113 arranged in the axial direction of the stator 100 can limit the oil return groove of the stator 100, ensuring the flow of the stator 100 so as to dissipate the heat of the stator 100. The stator yoke 11 corresponding to the second outer wall 112 can be symmetrical about the center line of the stator tooth 12 corresponding to the second outer wall 112. Of course, the symmetry line of the stator yoke 11 corresponding to the second outer wall 112 can be located on the center line of two adjacent stator tooth 12.

[0044] See also Figure 1 In an embodiment of the utility model, the length of the first rivet hole 13 in the radial direction of the stator punching sheet 10 is c, and the width of the first rivet hole 13 is b, b≤c≤2d1, so as to control the eddy current loss of the stator 100 by limiting the size of the first rivet hole 13, and effectively avoid the increase of loss due to the excessive area of ​​the first rivet hole 13.

[0045] Optionally, in an embodiment of the present utility model, the first rivet hole 13 is configured as a square hole and extends in the radial direction of the stator punching sheet 10, that is, on the basis of not affecting the direction of the magnetic lines of force, the first rivet hole 13 can extend in the extension direction of the first center line 121, so as to enhance the riveting force and enhance the rivet strength, thereby improving the structural strength of the stator 100. Of course, on the basis of satisfying 2t≤d1, and / or, b≤c≤2d1, the shape of the first rivet hole 13 includes but is not limited to a round hole, a waist-shaped hole, and a special-shaped hole.

[0046] Optionally, in an embodiment of the utility model, a second rivet hole 14 is provided on the stator yoke 11 corresponding to the oil return recess 113, and the second rivet hole 14 is located on the second center line 122 of the stator tooth 12 corresponding to the oil return recess 113. It can be understood that since the distance from the oil return recess 113 to the center of the stator punching sheet 10 is smaller than the distance from the first outer wall 111 to the center of the stator punching sheet 10, in the radial direction of the stator punching sheet 10, the radial thickness of the stator yoke 11 corresponding to the oil return recess 113 is smaller than the radial thickness of the stator yoke 11 corresponding to the first outer wall 111. Therefore, the first rivet hole 13 corresponding to the first outer wall 111 is a main rivet hole, and the second rivet hole 14 corresponding to the oil return recess 113 is an auxiliary rivet hole. The size of the first rivet hole 13 may be larger than the size of the second rivet hole 14. By co-arranging the first rivet hole 13 and the second rivet hole 14, the structural strength of the stator 100 can be further enhanced.

[0047] The second rivet hole 14 is arranged on the second center line 122 of the stator tooth 12 corresponding to the oil return recess 113, so that the second rivet hole 14 is symmetrical about the second center line 122, thereby reducing the risk of affecting the direction of the magnetic lines of force.

[0048] Furthermore, in an embodiment of the utility model, in the radial direction of the stator punching sheet 10, the minimum distance between the second rivet hole 14 and the outer periphery of the stator yoke 11 is d2, 2t≤d2<d1. It can be understood that d2 is the distance from the second rivet hole 14 to the outer periphery of the stator yoke 11 corresponding to the oil return recess 113. By limiting d2, it is easy to reduce the risk of fracture due to being too close to the outer periphery of the stator yoke 11, and it can also avoid the increase of eddy current loss due to the excessive size of the second rivet hole 14.

[0049] Optionally, in an embodiment of the utility model, Q1 of the first rivet holes 13 are provided, and Q2 of the second rivet holes 14 are provided, Q1≥Q2. It can be understood that the stator yoke 11 corresponding to the multiple first outer walls 111 is provided with first rivet holes 13 to ensure uniform force, wherein the stator yoke 11 corresponding to the multiple oil return recesses 113 is provided with second rivet holes 14, or the stator yoke 11 corresponding to some of the oil return recesses 113 is provided with second rivet holes 14; of course, when the provision of the multiple first rivet holes 13 can ensure the structural strength of the stator 100, the second rivet holes 14 may not be provided.

[0050] Specifically, in the embodiment of the utility model, the second rivet hole 14 is configured as a round hole or a square hole, wherein when the second rivet hole 14 is a round hole, compared with a square hole, it can reduce eddy current loss while ensuring a better auxiliary riveting force. Of course, when the size of the second rivet hole 14 is small, the second rivet hole 14 can also be configured as a square hole.

[0051] See also Figure 1 In the embodiment of the utility model, the central angle corresponding to the first outer wall 111 is a, 360 / N<a<360 / C, N is the number of teeth of the stator 100 of the stator punching sheet 10, and C is the greatest common divisor of the number of teeth of the stator 100 and the number of poles of the rotor 200, so that a larger contact area can be ensured between the first outer wall 111 and the housing, the retention force of the stator 100 is improved, and the energy efficiency of the motor is improved; and the first outer wall 111 can be made symmetrical about the first center line 121, which helps to improve the modal state of the stator 100 and thus reduce the noise of the motor. Optionally, the contour lines of the first outer wall 111 and the second outer wall 112 can both be configured as arc lines, and the contour line of the oil return recess 113 can be configured as a polyline, which includes a straight line segment and an arc line segment, or only includes a plurality of straight line segments.

[0052] Optionally, in an embodiment of the utility model, the distance from the first outer wall 111 to the center of the stator punching sheet 10 is D1, and the distance from the second outer wall 112 to the center of the stator punching sheet 10 is D2, D1≥D2. It can be understood that when D1=D2, the second outer wall 112 is connected to the outer shell, which can further increase the holding force of the stator 100 and improve the connection strength between the stator 100 and the outer shell. In addition, the stator yoke 11 corresponding to the second outer wall 112 has a larger radial thickness, which helps to improve the structural strength of the stator punching sheet 10; when D1>D2, an oil return gap is formed between the second outer wall 112 and the outer shell, which helps to increase the flow of the stator 100. Combined with the setting of the oil return recess 113, the oil return rate can be reliably guaranteed, thereby improving the heat dissipation efficiency of the motor.

[0053] The utility model also proposes a motor, which includes a stator 100. The specific structure of the stator 100 refers to the above embodiment. Since the motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0054] When the improved stator 100 and the rotor 200 are used to form a motor, when the motor is unloaded, Figure 5 The schematic diagram of the magnetic field line distribution on the stator punching sheet 10 at a certain moment, and the motor under load, such as Figure 6 The magnetic field line distribution diagram of the stator punching sheet 10 shown in FIG. Figure 1The effect comparison shown is that, compared with the motor efficiency of the control group, the motor efficiency in this embodiment is high and the eddy current loss is lower.

[0055] Specifically, the motor further includes a rotor 200 as described below.

[0056] See also Figure 7 In one embodiment, the rotor 200 includes a rotor core, which includes a plurality of rotor punchings 20 stacked along the axial direction of the rotor core, and a plurality of magnetic steel slots 21 are formed on the rotor punchings 20; a third rivet hole 22 is also provided on the rotor punchings 20, and the third rivet hole 22 is located between two adjacent magnetic steel slots 21.

[0057] It can be understood that a plurality of magnetic steel slots 21 are arranged at intervals along the circumference of the rotor punching 20 to fix the magnetic steel in the rotor core, thereby facilitating the magnetic field generated by the magnetic steel to match the magnetic field generated by the stator 100 winding; wherein a third rivet hole 22 is provided between two adjacent magnetic steel slots 21, and the third rivet hole 22 is for the rivet to pass through, on the one hand, to achieve the connection of multiple rotor punchings 20 and improve the overall structural strength of the rotor 200; on the other hand, the third rivet hole 22 is arranged away from the stator 100 and the magnetic steel, so that the third rivet hole 22 is arranged at a position with lower magnetic density on the rotor punching 20, thereby, without affecting the direction of the magnetic line of force, the eddy current loss caused by the magnetic line of force passing through the third rivet hole 22 can be minimized, which helps to improve the energy efficiency of the motor or compressor 1000.

[0058] Optionally, in one embodiment, there is a third center line 24 between two adjacent magnetic steel slots 21, and two third rivet holes 22 are provided, and are arranged on opposite sides of the third center line 24. It can be understood that on the basis of ensuring better riveting force, two third rivet holes 22 are symmetrically arranged about the third center line 24, so that the size of a single third rivet hole 22 can be reduced, which helps to reduce the eddy current loss at the third rivet hole 22.

[0059] The shape of the third rivet hole 22 includes but is not limited to a square hole, a round hole, and a waist-shaped hole, and the size and effect thereof can refer to the first rivet hole 13 .

[0060] Furthermore, in one embodiment, the magnetic steel slot 21 includes two inclined slot sections 211 arranged at an angle, and the inclined slot sections 211 of two adjacent magnetic steel slots 21 are arranged to be gradually contracted in the direction close to the outer periphery of the rotor core, wherein the two adjacent magnetic steel slots 21 are arranged symmetrically about the third center line 24, and the two inclined slot sections 211 on the same magnetic steel slot 21 are arranged symmetrically about the fourth center line 25, at this time, the two third rivet holes 22 are arranged to be gradually contracted in the direction close to the outer periphery of the rotor core, and the inclination direction of the third rivet hole 22 is consistent with the inclination direction of the inclined slot section 211, so as to reduce the influence of the third rivet hole 22 on the direction of the magnetic lines of force. Of course, in other embodiments, the magnetic steel slot 21 may also be a straight slot extending radially along the rotor punching 20.

[0061] Optionally, in one embodiment, a fourth rivet hole 23 is provided between the magnetic steel slot 21 and the outer periphery of the rotor punching sheet 20, and the fourth rivet hole 23 is located on the fourth center line 25 of the corresponding magnetic steel slot 21, so that the structural strength of the rotor 200 can be further enhanced. The fourth rivet hole 23 is arranged on the fourth center line 25, which can ensure that the fourth rivet hole 23 is symmetrical about the fourth center line 25, which helps to reduce the risk of affecting the direction of the magnetic lines of force and reduce eddy current losses.

[0062] And because the gap between two adjacent magnetic steel slots 21 is larger than the gap between the magnetic steel slot 21 and the outer edge of the rotor core, the size of the third rivet hole 22 can be larger than the size of the fourth rivet hole 23. Therefore, the third rivet hole 22 is the main rivet hole and the fourth rivet hole 23 is the auxiliary rivet hole.

[0063] The shape of the fourth rivet hole 23 includes but is not limited to a round hole, a square hole, and a waist-shaped hole, and the size and effect thereof can refer to the second rivet hole 14 .

[0064] Optionally, in one embodiment, the third rivet holes 22 are provided with Q3, the fourth rivet holes 23 are provided with Q4, Q3≤2P, Q4≤2P, P is the number of poles of the rotor 200, so that by limiting the quantitative relationship between the third rivet holes 22, the fourth rivet holes 23 and the number of magnetic poles of the rotor 200, the eddy current loss on the rotor 200 is greatly reduced on the basis of ensuring the overall structural strength of the rotor 200. Of course, when the provision of multiple third rivet holes 22 can ensure the structural strength of the rotor 200, the fourth rivet holes 23 may not be provided.

[0065] Optionally, in one embodiment, a flow hole 26 is opened on the rotor punching 20, and the flow hole 26 is used for the refrigeration oil and the refrigerant in the compressor 1000 to pass through, so as to realize energy circulation.

[0066] The utility model also provides a compressor 1000, which includes a stator 100 or a motor. The specific structure of the stator 100 or the motor refers to the above embodiment. Since the compressor 1000 adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Of course, the compressor 1000 can include the above rotor 200.

[0067] like Figure 2 As shown, the compressor 1000 also includes a crankshaft 101 connected to the rotor core of the rotor 200, wherein the crankshaft 101 is connected to the rotor core through the axial hole of the rotor core, and the crankshaft 101 is also connected to a power unit. Therefore, when the power unit is working, the rotor core can be driven to rotate through the crankshaft 101.

[0068] The compressor 1000 further includes a main bearing 102, a secondary bearing 105, a cylinder 103 and a piston 104. One end of the crankshaft 101 is inserted into the rotor 200, and the other end passes through the main bearing 102, the cylinder 103 and the secondary bearing 105 in sequence.

[0069] The utility model also proposes a refrigeration device, which includes a motor or a compressor 1000. The specific structure of the motor or the compressor 1000 refers to the above embodiment. Since the stator 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0070] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A stator punching sheet, characterized in that: include: stator yoke; and A plurality of stator teeth are arranged at intervals on the inner side of the stator yoke; Wherein, the outer peripheral surface of the stator yoke includes a plurality of first outer walls and a plurality of second outer walls which are arranged alternately, and the first outer walls and the second outer walls are connected by an oil return recess; A first rivet hole is provided on the stator yoke corresponding to the first outer wall, and the first rivet hole is located on the first center line of the stator tooth corresponding to the first outer wall. In the radial direction of the stator punching sheet, the minimum distance between the first rivet hole and the outer periphery of the stator yoke is d1, 2t≤d1, and t is the thickness of the stator punching sheet.

2. The stator sheet according to claim 1, characterized in that: The length of the first rivet hole in the radial direction of the stator punching sheet is c, and the width of the first rivet hole is b, where b≤c≤2d1.

3. The stator sheet according to claim 2, characterized in that: The first rivet hole is configured as a square hole and extends in the radial direction of the stator punching sheet.

4. The stator sheet according to claim 1, characterized in that: A second rivet hole is provided on the stator yoke portion corresponding to the oil return recess, and the second rivet hole is located on the second center line of the stator tooth portion corresponding to the oil return recess.

5. The stator sheet according to claim 4, characterized in that: In the radial direction of the stator punching sheet, the minimum distance between the second rivet hole and the outer periphery of the stator yoke is d2, and 2t≤d2<d1.

6. The stator sheet according to claim 4, characterized in that: The number of the first rivet button holes is Q1, the number of the second rivet button holes is Q2, and Q1≥Q2.

7. The stator sheet according to claim 4, characterized in that: The second rivet hole is configured as a round hole or a square hole.

8. The stator sheet according to claim 1, characterized in that: The central angle corresponding to the first outer wall is a, 360 / N<a<360 / C, N is the number of stator teeth of the stator punching sheet, and C is the greatest common divisor of the number of stator teeth and the number of rotor poles.

9. The stator sheet according to claim 1, characterized in that: The distance from the first outer wall to the center of the stator punching sheet is D1, the distance from the second outer wall to the center of the stator punching sheet is D2, and D1≥D2.

10. A stator, characterized in that: The invention comprises a stator sheet as claimed in any one of claims 1 to 9.

11. A motor, characterized in that: Comprising the stator as claimed in claim 10.

12. A compressor, characterized in that: It comprises the stator as claimed in claim 10 or the motor as claimed in claim 11.

13. A refrigeration device, characterized in that: It comprises the motor as claimed in claim 11 or the compressor as claimed in claim 12.

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