Outer rotor motor and refrigeration equipment

Abstract

The invention discloses an external rotor motor and refrigeration equipment, and the external rotor motor comprises a stator assembly, a rotor assembly, and a bearing. The rotor assembly comprises a machine shell, a rotor and a rotating shaft, the rotating shaft is fixedly connected with the machine shell, the rotor is fixedly connected with the machine shell, the machine shell is provided with a first clamping structure, the first clamping structure is located on the peripheral side of the rotating shaft, and the stator assembly is installed on the machine shell. The rotating shaft can rotate relative to the stator assembly; the bearing comprises a bearing outer ring and a bearing inner ring, the bearing outer ring is fixed to the stator assembly, the bearing is arranged on the rotating shaft in a sleeving mode, and the bearing inner ring is provided with a second clamping structure matched with the first clamping structure so as to limit relative rotation of the bearing inner ring and the machine shell. According to the technical scheme, the relative movement of the rotating shaft and the bearing inner ring is reduced, so that the external rotor motor outputs stable torque.

Description

Technical Field

[0001] The present invention relates to the technical field of motor structures, and particularly relates to an outer-rotor motor and a refrigeration device. Background Art

[0002] A bearing is sleeved on a rotating shaft in an outer-rotor motor. In related technologies, the bearings in common outer-rotor motors are usually assembled in a way that the outer ring is tightly fitted and the inner ring is loosely fitted, that is, the outer ring of the bearing is in interference fit with the bearing seat, and the inner ring of the bearing and the shaft are in transitional fit. However, in this assembly method, there is a relative movement between the inner ring of the bearing and the rotating shaft, which will cause the abnormal rotation speed output by the rotating shaft, thus affecting the stable output of the torque of the outer-rotor motor. Summary of the Invention

[0003] The main object of the present invention is to provide an outer-rotor motor, aiming to reduce the relative movement between the rotating shaft and the inner ring of the bearing, so that the outer-rotor motor outputs a stable torque.

[0004] To achieve the above object, the outer-rotor motor proposed by the present invention includes:

[0005] A stator assembly;

[0006] A rotor assembly, including a housing, a rotor and a rotating shaft, the rotating shaft is fixedly connected to the housing, the rotor is fixedly connected to the housing, the housing is provided with a first clamping structure, the first clamping structure is located on the outer peripheral side of the rotating shaft, the stator assembly is installed on the housing, and the rotating shaft is rotatable relative to the stator assembly;

[0007] A bearing, including an outer ring and an inner ring of the bearing, the outer ring of the bearing is fixed to the stator assembly, the bearing is sleeved on the rotating shaft, and the inner ring of the bearing is provided with a second clamping structure that cooperates with the first clamping structure to limit the relative rotation of the inner ring of the bearing and the housing.

[0008] Optionally, one of the first clamping structure and the second clamping structure is a clamping protrusion, and the other is a groove, and the clamping protrusion is used for inserting into the groove.

[0009] Optionally, the first clamping structure is a first clamping protrusion, the first clamping protrusion is provided on a side of the housing away from the stator assembly, the second clamping structure is a groove, the first clamping protrusion extends towards the front end of the housing, and the first clamping protrusion is inserted into the groove.

[0010] Optionally, an installation hole is penetrated through the rear end of the housing, the rotor assembly further includes a bushing, the bushing is in interference fit with the installation hole, the bushing is sleeved on the rotating shaft, the first clamping protrusion protrudes from the surface of the bushing, and the bearing abuts against the bushing.

[0011] Optionally, the mounting hole is a stepped hole, the shape of the bushing is adapted to the mounting hole, and the bushing abuts against the stepped surface of the mounting hole.

[0012] Optionally, a threaded hole is provided at the end of the rotating shaft, the rotor assembly further includes a spring washer, the spring washer is arranged at the rear end of the housing, and the spring washer abuts against both the bushing and the rotating shaft, and a bolt passes through the spring washer and is screwed into the threaded hole.

[0013] Optionally, the outer rotor motor includes an annular limiting sleeve, and a bearing is also sleeved on the rotating shaft. The two bearings are respectively arranged at both ends of the rotating shaft. The second clamping structure on the inner ring of the bearing is a groove, and the annular limiting sleeve is convexly provided with a second convex that cooperates with the groove. The second convex extends along the axial direction of the rotating shaft, and the second convex is inserted into the groove, and the annular limiting sleeve is fixedly connected to the rotating shaft.

[0014] Optionally, the annular limiting sleeve includes an annular sleeve and a second convex protruding from the periphery of the annular sleeve. The annular sleeve is sleeved on the rotating shaft, and the bottom wall of the annular sleeve abuts against the end face of the rotating shaft.

[0015] Optionally, the bottom wall of the annular sleeve is provided with a through hole, and the rotating shaft is correspondingly provided with a threaded hole for the through hole. The through hole is used for a bolt to pass through, and the bolt is screwed into the threaded hole to fix the annular sleeve to the rotating shaft.

[0016] Optionally, the stator assembly is provided with a rotating cavity, the rotating shaft is rotatably inserted into the rotating cavity, and a mounting convex portion is convexly provided in the rotating cavity. The mounting convex portion abuts against the bearing, and the second convex abuts against the inner ring of the bearing to press the bearing against the mounting convex portion.

[0017] Optionally, a clamping ring protrudes outward from the inner ring of the bearing, the second clamping structure is a groove formed in the clamping ring, and there are a plurality of the grooves, and the plurality of grooves are evenly spaced along the circumferential direction of the clamping ring.

[0018] The present invention also provides a refrigeration device, including the outer rotor motor as described above.

[0019] In the technical solution of the present invention, a first clamping structure is provided inside the housing. The rotating shaft is inserted into the housing, and the housing can rotate together with the rotating shaft. A bearing is sleeved on the rotating shaft, and a second clamping structure is provided on the inner ring of the bearing. Through the cooperation of the first clamping structure and the second clamping structure, relative rotation between the inner ring of the bearing and the rotating shaft can be prevented. The rotating shaft is rotatable relative to the stator assembly, the rotor is fixed inside the housing, and the outer ring of the bearing is fixedly connected to the outer ring of the bearing, that is, the bearing can be stably installed between the stator assembly and the rotating shaft. With this setting, when the rotating shaft rotates, the bearing and the rotating shaft will not rotate relative to each other, preventing the abnormal output speed of the rotating shaft, so that the outer rotor motor can output a stable torque and improve the use stability of the outer rotor motor. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0021] Figure 1 It is a cross-sectional view of an embodiment of the outer rotor motor of the present invention;

[0022] Figure 2 It is a cross-sectional view of some structures in an embodiment of the outer rotor motor of the present invention;

[0023] Figure 3 For Figure 2 The cross-sectional view of the housing and the bushing in

[0024] Figure 4 For Figure 2 The structural diagram of the bearing in

[0025] Figure 5 For Figure 2 The structural diagram of the annular limiting sleeve in

[0026] Explanation of the reference numerals in the drawings:

[0027] Label Name Label Name 10 Stator assembly 101 Rotating cavity 102 Mounting convex part 11 Housing 12 Rotor 13 Rotating shaft 14 Bushing 141 First clamping projection 15 Spring washer 16 Annular limit sleeve 161 Annular sleeve 162 Second clamping projection 163 Through hole 20 Bearing 201 Bearing outer ring 202 Bearing inner ring 203 Clamping ring 204 Groove

[0028] The realization of the object of the present invention, functional features and advantages will be further described with reference to the embodiments and the drawings. Detailed Embodiment

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0031] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0033] The present invention provides an outer rotor motor.

[0034] In an embodiment of the present invention, as Figures 1 to 5As shown in the figure, the outer rotor motor includes a stator assembly 10, a rotor assembly, and a bearing 20; the rotor assembly includes a housing 11, a rotor 12, and a rotating shaft 13. The rotating shaft 13 is fixedly connected to the housing 11, the rotor 12 is fixedly connected to the housing 11, and the housing 11 is provided with a first clamping structure located on the outer peripheral side of the rotating shaft 13. The stator assembly 10 is installed on the housing 11, and the rotating shaft 13 is rotatable relative to the stator assembly 10; the bearing 20 includes a bearing outer ring 201 and a bearing inner ring 202. The bearing outer ring 201 is fixed to the stator assembly 10, the bearing 20 is sleeved on the rotating shaft 13, and the bearing inner ring 202 is provided with a second clamping structure that cooperates with the first clamping structure to limit the relative rotation between the bearing inner ring 202 and the housing 11.

[0035] Wherein, if the bearing 20 rotates relative to the rotating shaft 13, the rotations of the rotating shaft 13 and the bearing 20 cannot be synchronized, the magnitude of the torque output by the outer rotor motor is unstable, and the speed of the output rotation is unstable.

[0036] In the technical solution of the present invention, a first clamping structure is provided inside the housing 11. The rotating shaft 13 is inserted into the housing 11, and the housing 11 can rotate together with the rotating shaft 13. A bearing 20 is sleeved on the rotating shaft 13. The bearing inner ring 202 of the bearing 20 is provided with a second clamping structure. Through the cooperation of the first clamping structure and the second clamping structure, the relative rotation between the bearing inner ring 202 and the rotating shaft 13 can be prevented. The rotating shaft 13 is rotatable relative to the stator assembly 10, the rotor 12 is fixed inside the housing 11, and the bearing outer ring 201 is fixedly connected to the bearing outer ring 201, that is, the bearing 20 can be stably installed between the stator assembly 10 and the rotating shaft 13. With this setting, when the rotating shaft 13 rotates, the bearing 20 and the rotating shaft 13 will not rotate relative to each other, preventing the abnormal output speed of the rotating shaft 13, so that the outer rotor motor can output a stable torque and improve the use stability of the outer rotor motor.

[0037] The stator assembly 10 includes a stator end cover and a stator. The stator is fixed to the stator end cover and partially extends into the housing 11. The stator end cover covers the front end of the housing 11, and the rotating shaft 13 rotatably passes through the stator.

[0038] In an embodiment, one of the first clamping structure and the second clamping structure is a clamping protrusion, and the other is a groove 204. The clamping protrusion is used for inserting into the groove 204.

[0039] Specifically, there are two embodiments. The first clamping structure can be a clamping protrusion, and the second clamping structure can be a groove 204; or the second clamping structure can be a clamping protrusion, and the first clamping structure can be a groove 204. The clamping protrusion is inserted and matched with the groove 204, and the groove 204 is used to limit the rotation of the clamping protrusion, so as to limit the relative rotation between the two, to ensure the mutual fixation of the rotating shaft 13 and the inner ring 202 of the bearing, so as to ensure the stability of the rotational speed output of the rotating shaft 13 and the stability of the torque output of the outer rotor motor. In some other embodiments, one of the first clamping structure and the second clamping structure is a snap member, and the other is a snap opening, and the snap member is used to clamp the snap opening.

[0040] In one embodiment, the first clamping structure is a first clamping protrusion 141. The first clamping protrusion 141 is provided on the side of the housing 11 away from the stator assembly 10. The second clamping structure is a groove 204. The first clamping protrusion 141 extends toward the front end of the housing 11, and the first clamping protrusion 141 is inserted into the groove 204.

[0041] Specifically, in this embodiment, the first clamping structure is a first clamping protrusion 141 protruding from the bottom of the housing 11. The bottom of the housing 11 is the end away from the stator assembly 10. The bearing 20 is sleeved on the rotating shaft 13 and is close to the bottom of the housing 11. The groove 204 of the inner ring 202 of the bearing is inserted and matched with the first clamping protrusion 141 at the bottom of the housing 11, so that the inner ring 202 of the bearing is fixed relative to the outer ring on the rotating shaft 13, ensuring that there is no relative rotation between the rotating shaft 13 and the inner ring 202 of the bearing, and ensuring the stable output of rotational speed and torque.

[0042] In one embodiment, an installation hole is provided through the rear end of the housing 11. The rotor assembly further includes a bushing 14. The bushing 14 is in interference fit with the installation hole. The bushing 14 is sleeved on the rotating shaft 13, and the first clamping protrusion 141 protrudes from the surface of the bushing 14. The bearing 20 abuts against the bushing 14.

[0043] Specifically, the bushing 14 is fixedly inserted into the installation hole, the rotating shaft 13 is inserted into the bushing 14. The end of the bushing 14 facing the stator assembly 10 protrudes with a first clamping protrusion 141. The first clamping protrusion 141 is used to insert into the groove 204 of the inner ring 202 of the bearing. The end of the first clamping protrusion 141 abuts against the bottom wall of the groove 204. This setting can reduce the wear and vibration of the rotating shaft 13, and the bushing 14 can also seal the installation hole. In some other embodiments, the first clamping protrusion 141 protrudes from the bottom of the housing 11.

[0044] In one embodiment, the installation hole is a stepped hole. The shape of the bushing 14 is adapted to the installation hole, and the bushing 14 abuts against the stepped surface of the installation hole.

[0045] Specifically, the bottom of the housing 11 is recessed to form a stepped hole. The width at the stepped surface is greater than the diameter of the hole in the middle part. The periphery of the hole in the middle part is bent inward to form an abutting portion. The bushing 14 is adaptively arranged in a convex shape. A part of the bushing 14 abuts against the stepped surface, and one end of the bushing 14 facing the stator assembly 10 abuts against the abutting portion to limit the axial movement of the bushing 14, so as to fix the bushing 14 at the installation hole. Such a setting can increase the installation stability of the bushing 14. In some other embodiments, the bushing 14 is embedded in the installation hole.

[0046] In one embodiment, a threaded hole is provided at the end of the rotating shaft 13. The rotor assembly further includes a spring washer 15. The spring washer 15 is arranged at the rear end of the housing 11, and the spring washer 15 abuts against both the bushing 14 and the rotating shaft 13. The bolt passes through the spring washer 15 and is screwed into the threaded hole.

[0047] Specifically, a threaded hole is provided at one end of the rotating shaft 13 inserted into the bushing 14. The threaded hole extends axially and is a blind hole. When the rotating shaft 13 is inserted into the bushing 14, the end of the rotating shaft 13 is flush with the end of the bushing 14. The spring washer 15 is placed at the ends of the rotating shaft 13 and the bushing 14. The spring washer 15 can cover the connection gap between the rotating shaft 13 and the bushing 14, so it can abut against both of them at the same time. The bolt passes through the spring washer 15 and is screwed tightly into the threaded hole. The head of the bolt can press the spring washer 15 against the rotating shaft 13 and the bushing 14, thereby increasing the installation stability of the rotating shaft 13 and the bushing 14, making the assembly of the outer rotor motor more tightly and stably, and it is not easy for the components to generate relative movement, thus ensuring the stable operation of the outer rotor motor. In some other embodiments, the bushing 14 is provided with two threaded holes, and two bolts pass through the spring washer 15 and are screwed into the two threaded holes on the bushing 14.

[0048] In one embodiment, the outer rotor motor includes an annular limiting sleeve 16. A bearing 20 is also sleeved on the rotating shaft 13. The two bearings 20 are respectively arranged at both ends of the rotating shaft 13. The second clamping structure on the inner ring 202 of the bearing is a groove 204. The annular limiting sleeve 16 is convexly provided with a second convex 162 that cooperates with the groove 204. The second convex 162 extends along the axial direction of the rotating shaft 13. The second convex 162 is inserted into the groove 204, and the annular limiting sleeve 16 is fixedly connected to the rotating shaft 13.

[0049] Specifically, an annular limiting sleeve 16 is provided at the other end of the rotating shaft 13. The annular limiting sleeve 16 is fixed to the rotating shaft 13, and a second clamping protrusion 162 protrudes from the annular limiting sleeve 16. At this end where the annular limiting sleeve 16 is provided, a bearing 20 is also provided. The bearing 20 is sleeved on the rotating shaft 13. The second clamping protrusion 162 on the annular limiting sleeve 16 is used to insert into the groove 204 of the bearing 20 to fix the inner ring 202 of the bearing relative to the rotating shaft 13. The outer ring 201 of the bearing 20 is fixed to the stator assembly 10. The two bearings 20 are concentrically arranged. Such a setting can make the rotational friction of the rotating shaft 13 smaller and can ensure that the bearing 20 at this place does not slide relative to the rotating shaft 13, thereby ensuring the stable rotational speed output and torque output of the outer rotor motor.

[0050] In an embodiment, the annular limiting sleeve 16 includes an annular sleeve 161 and a second clamping protrusion 162 protruding from the periphery of the annular sleeve 161. The annular sleeve 161 is sleeved on the rotating shaft 13, and the bottom wall of the annular sleeve 161 abuts against the end face of the rotating shaft 13.

[0051] Specifically, the annular sleeve 161 is sleeved on the rotating shaft 13, and a second clamping protrusion 162 protrudes from the end of the annular sleeve 161 facing the bearing 20. The bottom wall of the annular sleeve 161 abuts against the front end face of the rotating shaft 13. The annular sleeve 161 and the rotating shaft 13 are in interference fit. The end of the second clamping protrusion 162 of the annular sleeve 161 abuts against the bottom wall of the groove 204. Such a setting can improve the installation stability of the annular sleeve 161 and the rotating shaft 13 and can also ensure the clamping stability of the second clamping protrusion 162 and the groove 204. In some other embodiments, a positioning clamping protrusion protrudes from the side of the inner ring 202 of the bearing facing the rotating shaft 13, and a positioning groove is provided on the rotating shaft 13 corresponding to the positioning clamping protrusion. When the bearing 20 is sleeved on the rotating shaft 13, the positioning clamping protrusion is clamped in the positioning groove.

[0052] In an embodiment, a through hole 163 is provided on the bottom wall of the annular sleeve 161, and a threaded hole is provided on the rotating shaft 13 corresponding to the through hole 163. The through hole 163 is used for a bolt to pass through, and the bolt is screwed into the threaded hole to fix the annular sleeve 161 to the rotating shaft 13.

[0053] Specifically, the annular sleeve 161 can also be in a transition fit with the rotating shaft 13. A through hole 163 is provided in the bottom wall of the annular sleeve 161, and a threaded hole is provided at the position of the rotating shaft 13 corresponding to the through hole 163. After the bolt passes through the through hole 163, it is screwed into the threaded hole. When the bolt is tightened, the bolt can press the annular sleeve 161 against the rotating shaft 13. Such a setting is convenient for the assembly and disassembly of the annular sleeve 161. In some other embodiments, a buckle is provided inside the annular sleeve 161, and a clamping groove is provided on the rotating shaft 13 corresponding to the buckle. The buckle is used to clamp the clamping groove to fix the annular sleeve 161 to the rotating shaft 13.

[0054] In one embodiment, the stator assembly 10 is provided with a rotating cavity 101. The rotating shaft 13 is rotatably disposed through the rotating cavity 101. An installation convex portion 102 protrudes inside the rotating cavity 101. The installation convex portion 102 abuts against the bearing 20, and the second convex 162 abuts against the inner ring 202 of the bearing 20 to press the bearing 20 against the installation convex portion 102.

[0055] Specifically, a rotating cavity 101 is provided inside the stator assembly 10. The rotating shaft 13 is disposed through the rotating cavity 101. Two bearings 20 are respectively arranged at the front and rear ends of the rotating cavity 101. The outer ring 201 of the bearing is fixed to the inner wall of the rotating cavity 101. Installation convex portions 102 are provided at both the front and rear ends of the rotating cavity 101. The side wall of the bearing 20 without the groove 204 abuts against the installation convex portion 102. The bearing 20 at the front end abuts against the annular sleeve 161, and the bearing 20 at the rear end abuts against the bushing 14. With such a setting, the installation convex portion 102 can limit the bearing 20 and increase the installation stability of the bearing 20, thereby further avoiding the unstable rotation of the rotating shaft 13 caused by the poor installation stability of the bearing 20 and ensuring the stable rotation of the outer rotor motor. In some other embodiments, an installation ring groove is formed inside the rotating cavity 101, and a clamping gasket is installed in the installation ring groove for abutting against the bearing 20.

[0056] Furthermore, in the embodiment with the spring washer 15, the spring washer 15 presses against the bushing 14, and the bushing 14 presses the bearing 20 against the installation convex portion 102; in the embodiment with the annular sleeve 161, the annular sleeve 161 presses the bearing 20 against the installation convex portion 102.

[0057] In one embodiment, a clamping ring 203 protrudes outward from the inner ring 202 of the bearing 20. The second clamping structure is a groove 204 disposed through the clamping ring 203. There are multiple grooves 204, and the multiple grooves 204 are evenly spaced along the circumferential direction of the clamping ring 203.

[0058] Specifically, the clamping ring 203 protrudes from the side wall of the inner ring 202 of the bearing. Grooves 204 are provided on the circumferential wall of the clamping ring 203. The number of grooves 204 is multiple, and the multiple grooves 204 are evenly spaced along the circumferential direction. In this embodiment, the number of grooves 204 is four. Correspondingly, both the second convex 162 and the first convex 141 are provided with four. The multiple first convexes 141 and the multiple grooves 204 are inserted into each other one by one, and the multiple second convexes 162 and the multiple grooves 204 are inserted into each other one by one. With such a setting, the fixing stability between the two end bearings 20 and the rotating shaft 13 can be further increased, ensuring that the inner ring 202 of the bearing and the rotating shaft 13 do not rotate relative to each other, thereby avoiding the occurrence of abnormal rotational speed output of the rotating shaft 13. In some other embodiments, the groove 204 penetrates through the inner ring 202 of the bearing.

[0059] The present invention also provides a refrigeration device, which can be divided into compression refrigeration devices, absorption refrigeration devices, steam jet refrigeration devices, heat pump refrigeration devices, electrothermal refrigeration devices, etc. The refrigeration device mainly includes a compressor, an expansion valve, an evaporator, a condenser, and accessories, pipelines, and an external rotor motor. Such as refrigerators, air conditioners, etc. The specific structure of the external rotor motor refers to the above embodiments. Since this refrigeration device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0060] The above are only optional embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. An external rotor motor, characterized in that, Comprising: Stator assembly; Rotor assembly, including a housing, a rotor and a rotating shaft, the rotating shaft is fixedly connected to the housing, the rotor is fixedly connected to the housing, the housing is provided with a first clamping structure, the first clamping structure is located on the outer peripheral side of the rotating shaft, the stator assembly is installed on the housing, and the rotating shaft is rotatable relative to the stator assembly; Bearing, including an outer bearing ring and an inner bearing ring, the outer bearing ring is fixed to the stator assembly, the bearing is sleeved on the rotating shaft, and the inner bearing ring is provided with a second clamping structure that cooperates with the first clamping structure to limit the relative rotation between the inner bearing ring and the housing.

2. The external rotor motor according to claim 1, characterized in that, One of the first clamping structure and the second clamping structure is a clamping protrusion, and the other is a groove, and the clamping protrusion is used for inserting into the groove.

3. The external rotor motor according to claim 2, characterized in that, The first clamping structure is a first clamping protrusion, the first clamping protrusion is provided on the side of the housing away from the stator assembly, the second clamping structure is a groove, the first clamping protrusion extends towards the front end of the housing, and the first clamping protrusion is inserted into the groove.

4. The external rotor motor according to claim 3, characterized in that, An installation hole is provided through the rear end of the housing, the rotor assembly further includes a bushing, the bushing is in interference fit with the installation hole, the bushing sleeves the rotating shaft, the first clamping protrusion protrudes from the surface of the bushing, and the bearing abuts against the bushing.

5. The external rotor motor according to claim 4, characterized in that, The installation hole is a stepped hole, the shape of the bushing is adapted to the installation hole, and the bushing abuts against the stepped surface of the installation hole.

6. The external rotor motor according to claim 4, characterized in that, A threaded hole is provided at the end of the rotating shaft, the rotor assembly further includes a spring washer, the spring washer is provided at the rear end of the housing, and the spring washer abuts against both the bushing and the rotating shaft, and a bolt passes through the spring washer and is screwed into the threaded hole.

7. The external rotor motor according to claim 2, characterized in that, The outer rotor motor includes an annular limiting sleeve, and a bearing is also sleeved on the rotating shaft, the two bearings are respectively arranged at both ends of the rotating shaft, the second clamping structure on the inner bearing ring is a groove, the annular limiting sleeve protrudes with a second clamping protrusion that cooperates with the groove, the second clamping protrusion extends along the axial direction of the rotating shaft, the second clamping protrusion is inserted into the groove, and the annular limiting sleeve is fixedly connected to the rotating shaft.

8. The external rotor motor according to claim 7, characterized in that, The annular limiting sleeve includes an annular sleeve and a second clamping protrusion protruding from the periphery of the annular sleeve, the annular sleeve is sleeved on the rotating shaft, and the bottom wall of the annular sleeve abuts against the end face of the rotating shaft.

9. The external rotor motor according to claim 8, characterized in that, The bottom wall of the annular sleeve is provided with a through hole, the rotating shaft is provided with a threaded hole corresponding to the through hole, the through hole is used for the bolt to pass through, and the bolt is screwed into the threaded hole to fix the annular sleeve to the rotating shaft.

10. The external rotor motor according to claim 7, characterized in that, The stator assembly is provided with a rotating cavity, the rotating shaft is rotatably inserted into the rotating cavity, an installation convex part protrudes in the rotating cavity, the installation convex part abuts against the bearing, and the second clamping protrusion abuts against the inner bearing ring of the bearing to press the bearing against the installation convex part.

11. The external rotor motor according to any one of claims 1 to 10, characterized in that, The inner bearing ring of the bearing protrudes outwards with a clamping ring, the second clamping structure is a groove formed in the clamping ring, there are a plurality of the grooves, and the plurality of grooves are evenly spaced along the circumferential direction of the clamping ring.

12. A refrigeration device, characterized in that, including an outer rotor motor according to any one of claims 1 to 11.

Images