Stator and shell assembly structure, motor, compressor and assembly method thereof

Abstract

The invention provides an assembly structure of a stator and a shell, a motor, a compressor and an assembly method thereof, and the assembly structure of the stator and the shell comprises the shell, the stator and a bolt. The stator is sleeved with the shell, the bolts are inserted between the stator and the shell in the axial direction of the stator, the number of the bolts is more than two, and the bolts are distributed in the circumferential direction of the stator; each bolt is inserted and fixed between the stator and the shell in an interference fit manner; each bolt becomes thinner along the axial direction of the stator, the insertion depth of each bolt is adjustable, and the bolts are matched to adjust the radial position of the stator in the shell by adjusting the insertion depth, so that the air gap between the stator and the rotor in the circumferential direction is more uniform, and the vibration noise is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of stator and housing assembly, and in particular relates to a stator and housing assembly structure, a motor, a compressor and an assembly method thereof. Background Art

[0002] In traditional technology, the motor stator of the rotary compressor is assembled with the housing by shrink fitting. Specifically, the housing is heated, and the stator is inserted into the housing after the housing expands. After the housing cools down, the stator and the housing are fixed by interference fit. In order to ensure reliable fit, a large interference fit is required, which will cause deformation of the stator core and cause vibration and noise problems. At the same time, the outer periphery of the stator is subjected to large-area compressive stress, which will increase iron loss and reduce efficiency.

[0003] The motor stator and housing can also be fixed by welding. Although this can reduce the increase in iron loss, welding will cause local deformation of the stator due to high temperature. Especially for motors with smaller yoke sizes, it may also cause the motor insulation to break and fail.

[0004] In the prior art, the assembly process of the motor and the compression mechanism of the rotary compressor is as follows: the rotor of the motor is fixed to the crankshaft of the compression mechanism by cold pressing or shrink fitting, the stator of the motor is fixed to the housing by shrink fitting or welding, and a gap sheet is placed between the stator and the rotor during the stator-rotor assembly, and the gap between the rotor and the stator is determined by the gap sheet, and the compression mechanism is fixed to the housing by welding, and the gap sheet is removed after the stator and the rotor are fixed to the housing. The gap between the stator and the rotor is determined and cannot be adjusted. Since the gap between the stator and the rotor is controlled by the gap sheet, and there is a gap between the gap sheet and the stator and the rotor during assembly, and since the shrink fitting and welding processes will cause the parts to deform due to heat, it is inevitable that the air gap will be uneven after assembly, which is one of the main reasons for the vibration and noise problems of the compressor. In addition, due to the uneven air gap between the stator and the rotor, the gap between the stator and the rotor is usually designed to be more than 0.5 mm, so as to reduce the vibration and noise problems caused by the uneven air gap, but a larger air gap will cause the compressor performance to decline and limit the energy efficiency upgrade of the compressor. Summary of the invention

[0005] Therefore, the present invention provides a stator and housing assembly structure, a motor, a compressor and an assembly method thereof, and the main technical problem to be solved is: how to improve the uniformity of the gap between the stator and the rotor.

[0006] In order to solve the above problems, the present invention provides an assembly structure of a stator and a housing, which includes a housing, a stator and a latch;

[0007] The stator is sleeved in the housing, and the latch is inserted between the stator and the housing along the axial direction of the stator. The number of the latch is more than two and they are distributed in the circumferential direction of the stator. Each of the latches is inserted and fixed between the stator and the housing by means of interference fit.

[0008] Wherein, each of the latches is tapered along the axial direction of the stator, and the insertion depth of each of the latches is adjustable. The radial position of the stator in the housing can be adjusted by adjusting the insertion depth of each of the latches.

[0009] In some embodiments, each of the latches is partially assembled between the stator and the housing with an interference fit, and partially assembled between the stator and the housing with a clearance fit;

[0010] Take any one of the latches as latch A, the portion of the latch A that is clearance-fitted with the stator and the housing as the first portion, and the portion of the latch A that is interference-fitted with the stator and the housing as the second portion; wherein the second portion is thicker than the first portion.

[0011] In some embodiments, the axial length of the first portion is not less than 3 mm;

[0012] And / or, the stator has a stator core, and the axial length of the second portion is not less than 1 / 3 of the axial height of the stator core.

[0013] In some embodiments, each of the latches is formed by connecting two or more connecting segments of different thicknesses in sequence along the axial direction of the stator;

[0014] Or, each of the latches gradually becomes thinner along the axial direction of the stator;

[0015] Alternatively, each of the latches is in the shape of a truncated cone.

[0016] In some embodiments, the outer surface of each of the latches is provided with an anti-slip structure.

[0017] In some embodiments, the stator is clearance-fitted with the housing;

[0018] Alternatively, the stator and the housing are interference fit, and the interference is less than or equal to 0.05 mm.

[0019] In some embodiments, grooves are provided on the outer wall of the stator, the grooves pass through both axial ends of the stator, the number of the grooves is equal to the number of the pins, and each of the pins is plugged into the gap between the corresponding groove and the housing in a one-to-one correspondence.

[0020] In some embodiments, the inner side of the stator has more than two stator teeth, and each of the grooves is opposite to a different stator tooth.

[0021] In some embodiments, each of the pins has a first surface and a second surface connected in sequence end to end along the circumferential direction, wherein the first surface is an arcuate surface that abuts against the inner wall of the shell, and the diameter of the first surface at each location along the axial direction of the stator is consistent with the diameter of the inner wall of the shell; the profile size of the cross section of the second surface decreases from large to small along the axial direction of the stator, so that the second surface cooperates with the first surface to allow the pin to decrease from thick to thin along the axial direction of the stator; wherein the cross section of the second surface is perpendicular to the axis of the stator.

[0022] In some embodiments, in a cross section perpendicular to the axis of the stator, the first surface has a first contour segment, the second surface has a second contour segment, a third contour segment, and a fourth contour segment connected in sequence along the circumferential direction, the second surface is connected to one end of the first contour segment through an end of the second contour segment facing away from the third contour segment, and the second surface is connected to the other end of the first contour segment through an end of the fourth contour segment facing away from the third contour segment, both the second contour segment and the fourth contour segment are straight line segments and are symmetrically arranged, and the third contour segment is an arc segment protruding outward.

[0023] The present invention further provides a motor, comprising the assembly structure of the stator and the housing as described in any one of the above.

[0024] The present invention further provides a compressor, comprising the assembly structure of a stator and a housing as described in any one of the above.

[0025] The present invention also provides a method for assembling the above-mentioned compressor, which comprises the following steps:

[0026] Step S1: Assemble the rotor and the compression component of the motor, insert the gap sheet into the outer periphery of the rotor along the circumferential direction, and then insert the stator, so that the upper end surface of the stator is higher than the upper end surface of the rotor; insert the housing outside the stator, and make the rotor and the compression component reach the target position in the housing; insert the latch between the housing and the stator, and make the position of the stator higher than the target stator position;

[0027] Step S2: applying force to the latch to make the stator and the housing perform preliminary tight fit; fixing the compression component and the housing;

[0028] Step S3: applying force to the latch and the stator so that both the stator and the latch reach the target axial height position; pulling out the gap sheet to check whether the gap between the stator and the rotor is uniform; if it is not uniform, adjusting the insertion depth of the latch at the corresponding position to adjust the radial position of the stator so that the gap between the stator and the rotor meets the requirement.

[0029] The present invention provides a stator and housing assembly structure, a motor, a compressor and an assembly method thereof, which have the following beneficial effects:

[0030] 1. Since the insertion depth of each pin is adjustable, when the gap between the stator and the rotor is uneven, resulting in a large air gap on one side and a small air gap on the opposite side, the pin depth on the side with a large air gap can be deepened and the pin depth on the side with a small air gap can be reduced, so that the stator is displaced to the side with a small air gap, thereby making the air gap between the stator and the rotor more uniform in the circumferential direction to reduce vibration noise.

[0031] 2. The pin is embedded between the housing and the stator by applying external force, so that the stator and the housing are in a tight fit. This can avoid the thermal deformation problem caused by the traditional high-temperature assembly method. At the same time, since the stator and the housing are only locally stressed at the pin, the problem of increased iron loss caused by compressive stress can also be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0033] Figure 1 is an exploded schematic diagram of a compressor provided by one embodiment of the present invention;

[0034] Figure 2 is a partial enlarged view of an assembly structure of a stator and a housing provided by an embodiment of the present invention;

[0035] Figure 3 is a cross-sectional view of a latch provided by one embodiment of the present invention;

[0036] Figure 4 It is a cross-sectional view of another latch provided by one embodiment of the present invention.

[0037] The accompanying drawings are marked as follows:

[0038] 1. Upper cover; 2. Latch; 3. Stator; 4. Shell; 5. Rotor; 6. Compression component; 7. Lower cover; 21. First surface; 22. Second surface; 31. Groove; 32. Stator tooth; 201. First contour segment; 202. Second contour segment; 203. Third contour segment; 204. Fourth contour segment. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0041] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0042] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0043] See also Figure 1-4 As shown, according to an embodiment of the present invention, there is provided an assembly structure of a stator 3 and a housing 4, which includes a housing 4, a stator 3 and a latch 2. The stator 3 is sleeved in the housing 4, and the latch 2 is inserted between the stator 3 and the housing 4 along the axial direction of the stator 3. The number of the latches 2 is more than two, and they are distributed in the circumferential direction of the stator 3. Preferably, the latches 2 are evenly distributed in the circumferential direction of the stator 3. Each latch 2 is inserted and fixed between the stator 3 and the housing 4 by means of an interference fit, and each latch 2 cooperates to keep the stator 3 and the housing 4 relatively fixed. Specifically, the latch 2 keeps the stator 3 and the housing 4 relatively fixed by means of the friction resistance between the stator 3 and the housing 4.

[0044] Each of the plug pins 2 is tapered along the axial direction of the stator 3, and the insertion depth of each of the plug pins 2 is adjustable. The radial position of the stator 3 in the housing 4 can be adjusted by adjusting the insertion depth of each of the plug pins 2.

[0045] In the above example, since the insertion depth of each pin 2 is adjustable, when the gap between the stator 3 and the rotor 5 is uneven, resulting in a large air gap on one side and a small air gap on the opposite side, the stator 3 can be displaced to the side with a small air gap by deepening the depth of the pin 2 on the side with a large air gap and reducing the depth of the pin 2 on the side with a small air gap, thereby making the air gap between the stator 3 and the rotor 5 more uniform in the circumferential direction to reduce vibration noise.

[0046] In addition, the pin 2 is embedded between the housing 4 and the stator 3 by applying an external force, so that the stator 3 and the housing 4 are in a tight fit state, which can avoid the thermal deformation problem caused by the traditional high-temperature assembly method. At the same time, since the stator 3 and the housing 4 are only locally stressed at the pin 2, the problem of increased iron loss caused by compressive stress can also be reduced.

[0047] Since the latch 2 can determine the installation position of the stator 3, in order to ensure sufficient clamping force and uniform force, the number of the latches 2 is greater than or equal to 3 and is evenly distributed along the circumference of the stator 3. Preferably, the number of the latches 2 is an even number, so that the radial force of the stator 3 is uniform and the static eccentricity of the stator 3 is reduced.

[0048] In some embodiments, each of the aforementioned plugs 2 is partially assembled between the stator 3 and the housing 4 with interference fit, and partially assembled between the stator 3 and the housing 4 with clearance fit. Specifically, any plug 2 is taken as a plug A, the portion of the plug A that is clearance fit with the stator 3 and the housing 4 is taken as the first portion, and the portion of the plug A that is interference fit with the stator 3 and the housing 4 is taken as the second portion; wherein the second portion is thicker than the first portion.

[0049] In the above example, since the first portion of the latch A is clearance-matched with the stator 3 and the housing 4 , an adjustment margin is provided for adjusting the radial position of the stator, thereby facilitating the adjustment of the radial position of the stator 3 .

[0050] It should be noted that: the second part mentioned above is interference fit with both the stator 3 and the housing 4 , and the first part mentioned above is clearance fit with at least one of the stator 3 and the housing 4 .

[0051] In some embodiments, the axial length of the first portion is not less than 3 mm. The first portion is a thin section of the latch A, and the first portion can guide the latch 2 when inserted between the stator 3 and the housing 4. In this example, by limiting the axial length of the first portion to not less than 3 mm, the guiding effect of the first portion can be improved.

[0052] In some embodiments, the aforementioned stator 3 has a stator core, and the axial length of the aforementioned second portion is not less than 1 / 3 of the axial height of the stator core.

[0053] Since the fixation between the stator 3 and the housing 4 mainly depends on the interference fit of the second part of the pin 2, in the above example, by limiting the axial length of the second part to be not less than 1 / 3 of the axial height of the stator core, the fixing effect of the pin 2 on both the stator 3 and the housing 4 can be ensured.

[0054] In order to achieve the effect that each of the aforementioned plug pins 2 gradually becomes thinner along the axial direction of the stator 3, in one example, each of the plug pins 2 can be formed by connecting two or more connecting segments of different thicknesses in sequence along the axial direction of the stator 3, so that each of the plug pins 2 gradually becomes thinner along the axial direction of the stator 3. It should be noted that the thickness of each connecting segment along the axial direction of the stator is the same. In another example, Figure 4 As shown, each pin 2 can be gradually tapered along the axial direction of the stator 3 to achieve a gradual thickness change effect of the pin 2. In a specific application example, each pin 2 can be in a truncated cone shape, so that each pin 2 can be gradually tapered along the axial direction of the stator 3.

[0055] In some embodiments, the outer surface of each latch 2 is provided with an anti-slip structure such as anti-slip grooves, so that the outer surface of the latch 2 has a non-smooth structure, which can further improve the holding force.

[0056] In one example, the stator 3 and the housing 4 may be clearance-fitted. In another example, the stator 3 and the housing 4 may be interference-fitted, and the interference amount is less than or equal to 0.05 mm.

[0057] In the above example, the stator 3 and the housing 4 may be in a state of clearance or weak interference fit, so that the stator 3 and the housing 4 are only locally stressed at the pin 2, which is helpful to reduce the problem of increased iron loss due to compressive stress.

[0058] In some embodiments, Figure 2 As shown, the outer wall of the stator 3 may be provided with grooves 31, which penetrate the two axial ends of the stator 3, and the number of the grooves 31 is equal to the number of the plugs 2. Each plug 2 is plugged into the gap between the corresponding groove 31 and the housing 4 one by one.

[0059] In the above example, each groove 31 provides an assembly space for the assembly of the latch 2, which is helpful to save volume.

[0060] It should be noted here that the stator 3 has a stator core, and the aforementioned groove 31 is generally arranged on the outer wall of the stator core.

[0061] In some embodiments, Figure 2 As shown, the inner side of the stator 3 has more than two stator teeth 32 , and each groove 31 is opposite to a different stator tooth 32 .

[0062] In the above example, because the contact part between the traditional housing and the stator is the stator yoke, the stator yoke is the main magnetic field path, the iron loss of the yoke accounts for a large proportion, and the iron loss increment due to stress after the heat-shrink fitting is also larger. However, the present invention sets the groove 31 at a position on the outer circle of the stator 3 opposite to the stator teeth 32, which is not the main magnetic field path, and the original iron loss of this position is very small, even if it is subjected to compressive stress, the iron loss increment is also very small.

[0063] In some embodiments, Figure 3 As shown, each of the aforementioned latches 2 has a first surface 21 and a second surface 22 connected end to end in sequence along the circumferential direction. The first surface 21 is an arcuate surface that abuts against the inner wall of the housing 4, and the diameter of the first surface 21 at all locations along the stator axis is consistent with the diameter of the inner wall of the housing 4. The profile size of the cross section of the second surface 22 changes from large to small along the axial direction of the stator 3, so that the second surface 22 cooperates with the first surface 21 to make the latch 2 change from thick to thin along the axial direction of the stator 3. The cross section of the second surface 22 is perpendicular to the axis of the stator 3.

[0064] In the above example, when the pin 2 is tapered along the axial direction of the stator 3 , the first surface 21 is brought into close contact with the inner wall of the housing 4 , so that the first surface 21 can guide the insertion of the pin 2 , thereby improving the insertion accuracy of the pin 2 .

[0065] In some embodiments, Figure 3As shown, in a cross section perpendicular to the axis of the stator 3, the aforementioned first surface 21 has a first contour segment 201, and the second surface 22 has a second contour segment 202, a third contour segment 203, and a fourth contour segment 204 connected in sequence along the circumferential direction. The second surface 22 is connected to one end of the first contour segment 201 through one end of the second contour segment 202 that faces away from the third contour segment 203, and the second surface 22 is connected to the other end of the first contour segment 201 through one end of the fourth contour segment 204 that faces away from the third contour segment 203. Both the second contour segment 202 and the fourth contour segment 204 are straight line segments and are symmetrically arranged, and the third contour segment 203 is an arc segment convex outward.

[0066] In the above example, the second contour segment 202, the third contour segment 203 and the fourth contour segment 204 constitute the aforementioned second surface 22, the second contour segment 202 and the third contour segment 203 are both straight segments, and the third contour segment 203 is an arc segment, which has the effect of facilitating processing. It should be noted here that the aforementioned latch 2 can also be deformed into a combination of other arc segments and straight segments in the circumferential direction.

[0067] The present invention also provides a motor, which includes the assembly structure of the stator 3 and the housing 4 of any one of the above items. Among them, since the motor adopts the assembly structure of the stator 3 and the housing 4, because the insertion depth of each plug 2 is adjustable, when the gap between the stator 3 and the rotor 5 is uneven, resulting in a large air gap on one side, and a small air gap on the opposite side, the stator 3 can be displaced to the side with a small air gap by deepening the depth of the plug 2 on the side with a large air gap and reducing the depth of the plug 2 on the side with a small air gap, so that the air gap between the stator 3 and the rotor 5 in the circumferential direction can be more uniform, so as to reduce vibration noise.

[0068] like Figure 1 As shown, the present invention also provides a compressor, which includes the assembly structure of the stator 3 and the housing 4 of any one of the above items. Among them, since the compressor adopts the assembly structure of the stator 3 and the housing 4, because the insertion depth of each plug 2 is adjustable, when the gap between the stator 3 and the rotor 5 is uneven, resulting in a large air gap on one side, and a small air gap on the opposite side, the depth of the plug 2 on the side with a large air gap can be deepened and the depth of the plug 2 on the side with a small air gap can be reduced, so that the stator 3 is displaced to the side with a small air gap, thereby making the air gap between the stator 3 and the rotor 5 more uniform in the circumferential direction, so as to reduce vibration noise.

[0069] In some embodiments, the compressor may be a rotary compressor.

[0070] The present invention also provides a method for assembling the above-mentioned compressor, which comprises the following steps:

[0071] Step S1: Assemble the rotor 5 and the compression component 6, insert the gap sheet into the outer periphery of the rotor 5 along the circumferential direction, and then insert the stator 3, so that the upper end surface of the stator 3 is higher than the upper end surface of the rotor 5; insert the housing 4 into the outer side of the stator 3, and make the rotor 5 and the compression component 6 reach the target position in the housing 4; insert the pin 2 between the housing 4 and the stator 3, and make the position of the stator 3 higher than the target stator position.

[0072] Step S2: applying force to the latch 2 to make the stator 3 and the housing 4 preliminarily tightened and matched; fixing the compression component 6 and the housing 4.

[0073] Step S3: Apply force to both the latch 2 and the stator 3 so that both the stator 3 and the latch 2 reach the target axial height position; pull out the gap sheet to check whether the gap between the stator 3 and the rotor 5 is uniform. If it is uneven, adjust the radial position of the stator 3 by adjusting the insertion depth of the latch 2 at the corresponding position so that the gap between the stator 3 and the rotor 5 meets the requirements.

[0074] In the above example, step S1, step S2 and step S3 can cooperate to realize the assembly of the compressor, and the radial position of the stator 3 can be adjusted by adjusting the insertion depth of the pin 2 at the corresponding position so that the gap between the stator 3 and the rotor 5 meets the requirements.

[0075] Among them, in the above-mentioned step S1, the rotor 5 and the compression component 6 can be assembled by cold pressing or shrink fitting. When inserting the gap sheet, it can be inserted uniformly along the circumference of the rotor 5. When the stator 3 is inserted into the outer side of the rotor 5 in step S1, due to the suction force of the permanent magnet in the rotor 5, the stator 3 can be preliminarily matched with the rotor 5. When the housing 4 is inserted into the outer side of the stator 3, the rotor 5 and the compression component 6 can reach the target position in the housing 4 through the positioning device.

[0076] In the above step S2 , the compression component 6 and the housing 4 can be fixed by welding. Since the rotor 5 and the compression component 6 are relatively fixed, the position of the rotor 5 is also fixed at this time.

[0077] It should be noted here that: Figure 1 As shown, the aforementioned compressor further includes an upper cover 1 and a lower cover 7 , wherein the upper cover 1 is fixed to the upper end of the shell 4 , and the lower cover 7 is fixed to the lower end of the shell 4 .

[0078] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An assembly structure of a stator and a housing, Features: It comprises a housing (4), a stator (3) and a latch (2); The stator (3) is sleeved in the housing (4); the latch pins (2) are inserted between the stator (3) and the housing (4) along the axial direction of the stator (3); the number of the latch pins (2) is more than two and they are distributed in the circumferential direction of the stator (3); each of the latch pins (2) is inserted and fixed between the stator (3) and the housing (4) by means of interference fit; Each of the latch pins (2) is tapered along the axial direction of the stator (3), and the insertion depth of each of the latch pins (2) is adjustable. The combination of each of the latch pins (2) can adjust the radial position of the stator (3) in the housing (4) by adjusting the insertion depth.

2. The assembly structure of the stator and the housing according to claim 1, Features: Each of the latches (2) is partially assembled between the stator (3) and the housing (4) in an interference fit, and partially assembled between the stator (3) and the housing (4) in a clearance fit; Any one of the latch pins (2) is taken as latch pin A, the portion of the latch pin A that is clearance-fitted with the stator (3) and the housing (4) is taken as the first portion, and the portion of the latch pin A that is interference-fitted with the stator (3) and the housing (4) is taken as the second portion; wherein the second portion is thicker than the first portion.

3. The assembly structure of the stator and the housing according to claim 2, Features: The axial length of the first portion is not less than 3 mm; And / or, the stator (3) has a stator core, and the axial length of the second part is not less than 1 / 3 of the axial height of the stator core.

4. The assembly structure of the stator and the housing according to any one of claims 1 to 3, Features: Each of the latches (2) is formed by connecting two or more connecting segments of different thicknesses in sequence along the axial direction of the stator (3); Or, each of the latch pins (2) gradually becomes thinner along the axial direction of the stator (3); Alternatively, each of the latches (2) is in the shape of a truncated cone.

5. The assembly structure of the stator and the housing according to any one of claims 1 to 3, Features: The outer surface of each of the latches (2) is provided with an anti-slip structure.

6. The assembly structure of the stator and the housing according to any one of claims 1 to 3, Features: The stator is clearance-matched with the housing; Alternatively, the stator and the housing are interference fit, and the interference is less than or equal to 0.05 mm.

7. The assembly structure of the stator and the housing according to any one of claims 1 to 3, Features: The outer wall of the stator (3) is provided with a groove (31), the groove (31) runs through the axial ends of the stator (3), the number of the grooves (31) is equal to the number of the latches (2), and each of the latches (2) is plugged into a gap between a corresponding groove (31) and the housing (4) in a one-to-one correspondence.

8. The assembly structure of the stator and the housing according to claim 7, Features: The inner side of the stator (3) is provided with more than two stator teeth (32), and each of the grooves (31) is opposite to a different stator tooth (32).

9. The assembly structure of the stator and the housing according to any one of claims 1 to 3 and 8, Features: Each of the latches (2) has a first surface (21) and a second surface (22) connected in sequence end to end along the circumferential direction, wherein the first surface (21) is an arcuate surface that abuts against the inner wall of the housing (4), and the diameter of the first surface (21) at all locations along the axial direction of the stator (3) is consistent with the diameter of the inner wall of the housing (4); the profile size of the cross section of the second surface (22) changes from large to small along the axial direction of the stator (3), so that the second surface (22) cooperates with the first surface (21) to allow the latch (2) to change from thick to thin along the axial direction of the stator (3); wherein the cross section of the second surface (22) is perpendicular to the axis of the stator (3).

10. The assembly structure of the stator and the housing according to claim 9, Features: In a cross section perpendicular to the axis of the stator (3), the first surface (21) has a first contour segment (201), and the second surface (22) has a second contour segment (202), a third contour segment (203) and a fourth contour segment (204) connected in sequence along the circumferential direction; the second surface (22) is connected to one end of the first contour segment (201) via one end of the second contour segment (202) that faces away from the third contour segment (203), and the second surface (22) is connected to the other end of the first contour segment (201) via one end of the fourth contour segment (204) that faces away from the third contour segment (203); both the second contour segment (202) and the fourth contour segment (204) are straight line segments and are symmetrically arranged; and the third contour segment (203) is an arc segment convex outwards.

11. A motor, Features: The invention comprises an assembly structure of a stator and a housing as described in any one of claims 1 to 10.

12. A compressor, Features: The invention comprises an assembly structure of a stator and a housing as described in any one of claims 1 to 10.

13. A method for assembling the compressor of claim 12, Features: The following steps are involved: Step S1: Assemble the rotor (5) and the compression component (6) of the motor, insert the gap sheet into the outer periphery of the rotor (5) along the circumferential direction, and then insert the stator (3), so that the upper end surface of the stator (3) is higher than the upper end surface of the rotor (5); insert the housing (4) outside the stator (3), and make the rotor (5) and the compression component (6) reach the target position in the housing (4); insert the latch (2) between the housing (4) and the stator (3), and make the position of the stator (3) higher than the target stator position; Step S2: applying force to the latch (2) to make the stator (3) and the housing (4) preliminarily tighten and fit; fixing the compression component (6) and the housing (4); Step S3: applying force to the latch (2) and the stator (3) so that the stator (3) and the latch (2) both reach the target axial height position; pulling out the gap sheet to check whether the gap between the stator (3) and the rotor (5) is uniform; if it is not uniform, adjusting the insertion depth of the latch (2) at the corresponding position to adjust the radial position of the stator (3) so that the gap between the stator (3) and the rotor (5) meets the requirement.

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