CN115347735A - External rotor motor and air conditioner - Google Patents

Abstract

The invention discloses an outer rotor motor and an air conditioner. The outer rotor motor includes an outer rotor assembly, a stator assembly and an annular wind wheel. The outer rotor assembly is rotatably sleeved on the stator assembly. An air outlet is formed between the end of the outer rotor assembly facing the stator assembly and the stator assembly. The wind wheel is located at The air outlet is fixedly set on the outer rotor assembly, the end of the outer rotor assembly facing away from the stator assembly is provided with an air inlet, and the space surrounded by the outer rotor assembly and the stator assembly is provided with an air passage, and the air inlet and outlet pass through the air outlet. The wind channel is connected. When the outer rotor assembly rotates, it rotates together with the wind wheel. Under the action of the wind wheel, the high-temperature air in the air passage is blown out from the air outlet, and the outside normal temperature air is supplied into the air passage from the air inlet, and is discharged in the air passage. The heat exchange is carried out inside, and the outer rotor motor is cooled by means of internal and external air circulation. The outer rotor motor has better heat dissipation performance and longer service life.

Description

An external rotor motor and air conditioner

technical field

The invention relates to the field of electrical equipment, in particular to an external rotor motor and an air conditioner.

Background technique

External rotor motors have the advantages of space saving, compact design, low noise, high operating efficiency, and beautiful appearance, and are widely used in various fields, including fans, induction cookers, and electric vehicles. However, the current external rotor motors have relatively poor heat dissipation performance, and the temperature of the external rotor motor is high during operation, which directly affects the performance and service life of the external rotor motor. This is also the reason why the current external rotor motor has poor performance and short service life. main reason.

Contents of the invention

The main purpose of the present invention is to provide an external rotor motor with better heat dissipation performance.

The invention also provides an air conditioner.

In order to achieve the above purpose, the outer rotor motor proposed by the embodiment of the present invention includes an outer rotor assembly, a stator assembly and an annular wind wheel, the outer rotor assembly is rotatably sleeved on the stator assembly, and the orientation of the outer rotor assembly is An air outlet is formed between one end of the stator assembly and the stator assembly, the wind wheel is located at the air outlet, the wind wheel is fixedly sleeved on the outer rotor assembly, and the back of the outer rotor assembly is An air inlet is provided at one end of the stator assembly, and an air passage is provided in the space enclosed by the outer rotor assembly and the stator assembly, and the air inlet and the air outlet are communicated through the air passage.

In an exemplary embodiment, the outer rotor assembly includes a first top wall and a first peripheral wall connected to the first top wall, and the stator assembly includes a first bottom wall and a first peripheral wall connected to the first bottom wall. The second peripheral wall connected to the wall, the opening end of the first peripheral wall protrudes into the second peripheral wall, the opening end of the first peripheral wall is spaced from the first bottom wall, and the first peripheral wall An annular air outlet is formed between the wall and the second peripheral wall, the wind wheel is located in the air outlet, and the air inlet is located in the first top wall.

In an exemplary embodiment, the stator assembly further includes a circuit board, the circuit board is located between the first peripheral wall and the first bottom wall, and the circuit board is parallel to the first bottom wall , the opening end of the first peripheral wall is spaced from the circuit board, and the air passage is located in the area surrounded by the first top wall, the circuit board and the first peripheral wall.

In an exemplary embodiment, the circuit board includes a board body and electronic components, the electronic components are arranged on the side of the board body facing the first bottom wall, and the electronic components are implemented through the glue filling layer. Glue sealing.

In an exemplary embodiment, the glue filling layer fills the area between the board body, the first bottom wall and the second peripheral wall, and the glue filling layer faces the first top wall The edge of one side is at most flush with the side of the board facing the first top wall.

In an exemplary embodiment, the stator assembly further includes: a base, one end of the base facing the first top wall is provided with a stator winding, and the circuit board is located between the stator winding and the first top wall. Between a bottom wall, the circuit board is sleeved on the base; and a bracket, the bracket includes the first bottom wall and the second peripheral wall, and the base is installed in the bracket.

In an exemplary embodiment, the base is provided with a second bearing cavity with an opening facing the first bottom wall, the second bearing cavity is installed with a second bearing, and the first top wall is provided with a fixed A rotating shaft is fixed in the fixing hole, one end of the rotating shaft extends into the second bearing cavity, the second bearing is sleeved on the rotating shaft, and the first bottom wall closes the second bearing cavity the open end of.

In an exemplary embodiment, the base is further provided with a first bearing cavity with an opening facing the first top wall, a first bearing is installed in the first bearing cavity, and the first bearing is sleeved on the the shaft.

In an exemplary embodiment, the radial distance between the wind wheel and the second peripheral wall is not greater than 1 mm.

In an exemplary embodiment, the wind wheel is a metal part or a plastic part.

In an exemplary embodiment, the wind wheel is fixed to the outer rotor assembly by bonding or clamping or by screw locking.

The air conditioner provided by the embodiments of the present invention includes the outer rotor motor described in any one of the above embodiments.

In the technical solution of the present invention, when the outer rotor assembly rotates, it rotates with the wind wheel. Under the action of the wind wheel, the high-temperature air in the air passage is blown out from the air outlet, and the outside normal temperature air is supplied into the air passage from the air inlet. , and conduct heat exchange in the air passage, and cool down the outer rotor motor by means of internal and external air circulation. The outer rotor motor has better heat dissipation performance and a longer service life.

Description of drawings

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 that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative effort.

Fig. 1 is a three-dimensional structural schematic diagram of an outer rotor motor according to Embodiment 1 of the present invention;

Fig. 2 is a schematic cross-sectional structure diagram of the outer rotor motor shown in Fig. 1;

Figure 3 is a schematic diagram of the enlarged structure of part A in Figure 2, and the arrows indicate the direction of air flow;

Fig. 4 is a schematic diagram of an exploded structure of the outer rotor motor shown in Fig. 1;

Fig. 5 is a schematic cross-sectional structural view of the matching structure of the housing and the rotating shaft in Fig. 1;

Fig. 6 is a schematic diagram of the three-dimensional structure of the bracket in Fig. 1;

7 to 11 are structural schematic diagrams of the assembly sequence of the outer rotor motor shown in FIG. 1 .

Wherein, the corresponding relationship between reference numerals and component names in Fig. 1 to Fig. 11 is:

100 outer rotor assembly, 110 housing, 111 first top wall, 112 first peripheral wall, 120 rotating shaft, 200 stator assembly, 210 bracket, 211 first bottom wall, 212 second peripheral wall, 213 positioning groove, 220 circuit board, 230 glue layer, 240 base, 241 stator winding, 242 second bearing cavity, 243 first bearing cavity, 250 second bearing, 260 first bearing, 300 wind wheel, 410 air outlet, 420 air inlet, 430 wind aisle.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

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 part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

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 relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In addition, in the present invention, descriptions such as "first", "second" and so on are used for description purposes only, and should not be understood as indicating or implying their relative importance or implicitly indicating the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In addition, the technical solutions of the various embodiments of the present invention can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered as a combination of technical solutions. Does not exist, nor is it within the scope of protection required by the present invention.

Embodiment one

Fig. 1 is a three-dimensional structural schematic diagram of an outer rotor motor according to Embodiment 1 of the present invention. Fig. 2 is a schematic cross-sectional structure diagram of the outer rotor motor shown in Fig. 1 . FIG. 3 is a schematic diagram showing an enlarged structure of part A in FIG. 2 , and the arrows indicate the direction of air flow. FIG. 4 is a schematic diagram of an exploded structure of the outer rotor motor shown in FIG. 1 . Fig. 5 is a schematic cross-sectional structure diagram of the cooperation structure of the housing and the rotating shaft in Fig. 1 . FIG. 6 is a schematic perspective view of the three-dimensional structure of the bracket in FIG. 1 . 7 to 11 show the assembly sequence of the outer rotor motor.

The related technology provides an external rotor motor, the external rotor is located on the front side of the controller casing, and the external rotor is assembled with the controller casing, and the side of the external rotor facing the controller casing is provided with a first cooling fin A motor heat dissipation chamber is formed between adjacent first heat dissipation fins, a second heat dissipation fin is provided on the side of the controller housing facing the outer rotor, a controller heat dissipation chamber is formed between adjacent second heat dissipation fins, and the motor heat dissipation chamber It is located on the front side of the cooling cavity of the controller. When the outer rotor rotates, the outside normal temperature air enters the cooling cavity of the motor radially inward, then reaches the cooling cavity of the controller axially, and then blows out radially outward. During the whole process, the outside air cools down the outer rotor by taking away the heat transferred from the outer rotor to the wall of the heat dissipation cavity of the motor, but the heat dissipation effect of the outer rotor is not very good.

As shown in Figures 1 to 11, the outer rotor motor proposed by the embodiment of the present invention includes: an outer rotor assembly 100; a stator assembly 200 located behind the outer rotor assembly 100, and the outer rotor assembly 100 is set to be rotatably sleeved and mounted on On the stator assembly 200, and towards one end of the outer rotor assembly 100 of the stator assembly 200 (that is: the rear end of the outer rotor assembly 100) is arranged to jointly form an air outlet 410 for heat dissipation with the stator assembly 200; and an annular air outlet Wheel 300, the wind wheel 300 is set to be located at the air outlet 410, and the wind wheel 300 is set to be fixedly sleeved and installed on the outer rotor assembly 100; moreover, one end of the outer rotor assembly 100 facing away from the stator assembly 200 (that is: the outer rotor The front end of the outer rotor assembly 100) is provided with an air inlet 420 for taking in air at normal temperature. The inner space enclosed by the outer rotor assembly 100 and the stator assembly 200 has an air passage 430 for heat exchange. The air passage 430 is set to communicate with the air inlet. The air outlet 420 and the air outlet 410 , that is, the front end of the air passage 430 communicates with the air inlet 420 , and the rear end of the air passage 430 communicates with the air outlet 410 .

When the outer rotor motor rotates, the outer rotor assembly 100 rotates with the wind wheel 300. Under the action of the wind wheel 300, the high-temperature air in the air passage 430 is blown out from the air outlet 410, and the outside normal temperature air is supplied from the air inlet 420. Into the air passage 430, and conduct heat exchange in the air passage 430, through the way of internal and external air circulation to dissipate heat and cool down the outer rotor motor, the outer rotor motor has better heat dissipation performance and longer service life.

It can be that the wind wheel 300 is made of plastic material (such as the wind wheel 300 is a plastic part), and the cost of the wind wheel 300 made of plastic material is lower; or it can be that the wind wheel 300 is made of a metal material (such as the wind wheel 300 is a metal parts), although the cost of the wind wheel made of metal material is increased, the strength is better and the service life is longer; the above can achieve the purpose of this application, and its purpose does not depart from the design idea of the present invention, so it will not be repeated here , should fall within the scope of protection of this application.

Moreover, the wind wheel 300 can be fixedly mounted on the outer surface of the outer rotor assembly 100 by means of gluing (that is, bonding), and the wind wheel can also be fixedly installed on the outer surface of the outer rotor assembly 100 in a clamping manner. It can also be fixed and fitted on the outer surface of the outer rotor assembly 100 by means of screw locking. All of the above can achieve the purpose of this application, and its purpose does not deviate from the design concept of the present invention. within the scope of protection.

In order to better ensure the heat dissipation performance of the outer rotor motor, as shown in FIGS. The air outlet 410 can be set as an annular mouth, and the air outlet 410 can also be set as a plurality of circular holes evenly distributed in the circumferential direction, and the number can be two, three, four or five, etc.; all of the above To achieve the purpose of this application, its purpose does not deviate from the design concept of the present invention, so it will not be described in detail here, and all should belong to the protection scope of this application.

In an exemplary embodiment, as shown in FIG. 2 and FIG. 5 , the outer rotor assembly 100 includes a first top wall 111 on the front side and a first peripheral wall 112 on the rear side. The front edge of the first peripheral wall 112 is configured to be connected, and the stator assembly 200 may be configured to include a second peripheral wall 212 on the front side and a first bottom wall 211 on the rear side, and the periphery of the first bottom wall 211 is connected to the second peripheral wall. 212 connected to the rear edge, the opening end of the first peripheral wall 112 (i.e. the rear end) is set to extend from the opening end of the second peripheral wall 212 (i.e. the front end) back into the second peripheral wall 212 inside, and the first bottom wall 211 and the opening end of the first peripheral wall 112 are arranged to be axially spaced apart, and the second peripheral wall 212 and the first peripheral wall 112 are arranged to be radially spaced apart, so that a gap is formed between the second peripheral wall 212 and the first peripheral wall 112 An annular air outlet 410, the air outlet 410 is facing forward to discharge air. The wind wheel 300 sinks into the inside of the air outlet 410, and is fixedly installed on the outer side of the opening end (rear end) of the first peripheral wall 112. Under the action of the wind wheel 300, the high-temperature air in the air passage 430 The air can be blown to the outside from the air outlet 410 more smoothly, and the heat dissipation and cooling of the inside of the outer rotor motor can be performed. The air inlet 420 can be arranged on the first top wall 111 , which can better ensure that the air entering from the air inlet 420 is normal temperature air. Of course, the air inlet 420 can also be arranged on one end of the first peripheral wall 112 close to the first top wall 111 (that is, the front end of the first peripheral wall 112); the air inlet 420 can also be arranged on the first top wall 111 and the second One end (i.e. the front end of the first peripheral wall 112) near the first top wall 111 of the peripheral wall 112; the above can realize the purpose of the present application, and its purpose does not depart from the design idea of the present invention, so it will not be repeated here, and all Should belong to the scope of protection of this application.

In an exemplary embodiment, as shown in FIG. 2 and FIG. 3 , the stator assembly 200 further includes a circuit board 220, and the circuit board 220 is arranged to be located in the second peripheral wall 212 and between the first peripheral wall 112 and the first bottom. Between the walls 211 , and the board surface is perpendicular to the front-to-back direction, the circuit board 220 is spaced apart from the opening end of the first peripheral wall 112 to communicate with the air outlet 410 and the air passage 430 . Wherein, the air passage 430 is located between the first top wall 111, the circuit board 220, and the first peripheral wall 112. When the outer rotor assembly 100 rotates, it also dissipates heat and cools down the circuit board 220 at the same time, so that the circuit board 220 can be better ensured. 220 performance; moreover, the circuit board 220 is hidden and installed inside the outer rotor motor, and is not easy to be affected by moisture and bumps, so the reliability of the outer rotor motor is also better.

It can be that the circuit board 220 is an integral structure; or it can be that the circuit board 220 is a split structure including a plurality of sub-circuit boards, and the plurality can be two, three or four, etc.; all of the above can achieve the purpose of this application , and its purpose does not depart from the design idea of the present invention, so it will not be repeated here, and all should belong to the protection scope of the present application.

For example, as shown in FIG. 2 to FIG. 4 and FIG. 7 to FIG. 11 , the circuit board 220 is configured to include a board body and electronic components disposed on the board body, and the electronic components are located at one side of the board body facing the first bottom wall 211 . Side (that is: the rear side of the board), and the glue layer 230 formed by injecting glue resin to perform glue sealing protection, so as to avoid bump damage or moisture damage of electronic components during transportation and use.

Exemplarily, as shown in FIG. 2 , FIG. 9 and FIG. 10 , the injected potting resin fills the area enclosed between the plate body, the first bottom wall 211 and the second peripheral wall 212 to form an annular potting layer 230 , Moreover, the outer diameter of the glue filling layer 230 is set to be larger than the diameter of the plate body, so that the plate body is embedded in the side of the glue filling layer 230 towards the first top wall 111 (the front side of the glue filling layer 230), and is filled in the circumferential direction. Relative to the exposed area of the board body, the periphery of the adhesive layer 230 does not protrude forward from the side of the board body facing the first top wall 111 , which can better improve the heat dissipation performance of the circuit board 220 .

For example, as shown in FIGS. 1, 4, 7 to 11, the stator assembly 200 is further configured to include: a base 240, one end of the base 240 facing the first top wall 111 (ie: the front end of the base 240 ) is provided with a stator winding 241, the circuit board 220 is set to be located between the first bottom wall 211 and the stator winding 241, the circuit board 220 is in the shape of a ring, and the circuit board 220 is set to be sleeved and fixed on the base 240 from front to back , the base 240 is provided with a shoulder structure with a stepped face facing forward, and the circuit board 220 is located at the shoulder structure and abuts against the stepped surface backwards. The potting layer 230 is located on the rear side of the base 240, and one end of the base 240 facing the first bottom wall 211 is set to abut against the first bottom wall 211; and the bracket 210, the bracket 210 includes the first bottom wall in the foregoing content 211 and the second peripheral wall 212, the base 240 is set to be located in the bracket 210, and the base 240 is set to be a separate structure from the bracket 210, and the base 240 and the bracket 210 can be locked and fixedly connected by screws. Screws include multiple sets at intervals in the circumferential direction, so that the base 240 and the support 210 can be fixed together more firmly, and the machine base 240 and the support 210 are less likely to loosen and produce abnormal noise; multiple can be two or three Or four etc., all can realize the purpose of the present application, and its purpose does not depart from the design idea of the present invention, does not repeat them here, all should belong to the protection scope of the present application. The base 240 is set to be an aluminum seat, and the stator winding 241 is set to include iron cores and windings, the iron cores are evenly spaced in the circumferential direction, and the windings are set to be wound on the iron cores. The outer rotor assembly 100 is also configured to include a casing 110, the casing 110 includes the aforementioned first top wall 111 and the first peripheral wall 112, the first peripheral wall 112 is provided with a magnetic ring for providing a magnetic field, and the magnetic ring is located on the iron core The outer rotor assembly 100 is rotated radially on the outer side and evenly spaced along the circumferential direction. The magnetic field generated by the magnetic ring interacts with the magnetic field generated by the stator winding 241 to generate a magnetic torque. When the outer rotor assembly 100 rotates, air at normal temperature enters the air passage 430 from the air inlet 420 and is blown toward the stator winding 241 and the circuit board 220 to realize heat exchange with the stator winding 241 and the circuit board 220 and take away the stator winding 241 and the circuit board 220 After the heat from the plate 220 is blown to the outside from the air outlet 410 .

In an exemplary embodiment, as shown in FIG. 2, FIG. 7 to FIG. 11, a second bearing cavity 242 is provided on the base 240, and the opening of the second bearing cavity 242 faces the first bottom wall 211 (that is, the opening faces rear), the second bearing cavity 242 is set to install the second bearing 250, the first top wall 111 is set to fix the rotating shaft 120, and the rear end of the rotating shaft 120 is set to pass through the base 240 and extend into the second inside the bearing 250, and the first bottom wall 211 abuts against the rear end surface of the second bearing chamber 242 to seal the rear end opening of the second bearing chamber 242, and the lubricating grease coated on the second bearing 250 is less likely to be affected by moisture. invalidated. The first bottom wall 211 is provided with a positioning groove 213 with a concave front and a convex rear. The rear end of the second bearing 250 extends into the positioning groove 213 and is spaced from the bottom wall of the positioning groove 213. The rotating shaft 120 and the bottom of the positioning groove 213 The walls are also spaced apart. It can be that the rotating shaft 120 is installed on the first top wall 111 with interference; or it can be that the rotating shaft 120 is installed on the first top wall 111 through a spline structure; all of the above can achieve the purpose of this application, and its purpose does not depart from the present invention The design ideas, which will not be repeated here, should belong to the scope of protection of this application.

For example, as shown in FIG. 2, FIG. 7 to FIG. 11, a first bearing cavity 243 is also provided on the base 240, the opening of the first bearing cavity 243 faces the first top wall 111, and the inside of the first bearing cavity 243 is set as The first bearing 260 is installed, and the rotating shaft 120 extends into the first bearing 260, and the rotating shaft 120 is supported at two positions by the first bearing 260 and the second bearing 250, so that the rotation stability of the outer rotor assembly 100 is better.

Illustratively, the first bearing chamber 243 and the second bearing cavity 242 are two cylindrical grooves with openings opposite to each other. The first bearing 260 is installed in the cylindrical groove on the front side from front to back, and the second bearing 250 is installed from back to front. Put it into the cylindrical groove located on the rear side, and a through shaft hole for passing the rotating shaft 120 is provided between the bottom walls of the two cylindrical grooves. The rotating shaft 120 passes through the first bearing 260, the shaft hole and the second bearing from front to back in sequence Two bearings 250 are rotatably installed on the stator assembly 200 .

In an exemplary embodiment, as shown in FIG. 11 , the distance (that is, the radial distance) between the wind wheel 300 and the second peripheral wall 212 is set to be no greater than 1 mm. When the outer rotor assembly 100 is in operation, the air outlet 410 The air volume is greater.

It can be that the distance between the radially upward wind wheel 300 and the second peripheral wall 212 is set to 0.5mm; or it can be that the distance between the radially upward wind wheel 300 and the second peripheral wall 212 is set to 1mm; all of the above can realize this application The purpose, its tenet does not depart from the design concept of the present invention, and will not be repeated here, and all should belong to the protection scope of the present application.

The assembly process of the outer rotor motor provided by the embodiment of the present invention is as follows:

First: assemble the base 240 with the stator winding 241 installed and the circuit board 220 together, and install the first bearing 260 and the second bearing 250 in the first bearing cavity 243 and the second bearing cavity 242 respectively;

Next: install the housing with the rotating shaft 120 on the base 240 from the front side of the base 240, and the rotating shaft 120 passes through the first bearing 260, the shaft hole and the second bearing 250 sequentially from front to back;

Furthermore: the bracket 210 is fixed on the base 240 from the rear side of the base 240 by screw locking;

Furthermore: injecting a potting resin between the circuit board 220 and the bracket 210 to form a potting layer 230;

Finally: the wind wheel 300 is fixedly fitted on the rotor assembly 100 , and the wind wheel 300 is positioned in the air outlet 410 .

Embodiment two

The air conditioner provided by the embodiment of the present invention (not shown in the scheme diagram) includes the outer rotor motor described in any one of the first embodiment.

The air conditioner has all the advantages of the outer rotor motor provided by any one of the above embodiments, and will not be repeated here.

It may be that the air conditioner includes a wall-mounted unit and an outdoor unit, and the external rotor motor is applied to the outdoor unit; or it may be that the air conditioner includes a wall cabinet unit and an outdoor unit, and the external rotor motor is applied to the cabinet unit or the outdoor unit; or it may be that the air conditioner includes a wall Cabinet machine and outdoor machine, the external rotor motor is applied to both the cabinet machine and the outdoor machine; all of the above can achieve the purpose of this application, and its purpose does not deviate from the design concept of the present invention, so it will not be repeated here, and all should belong to the protection of this application within range.

To sum up, in the outer rotor motor provided by the embodiment of the present invention, when the outer rotor assembly rotates, it rotates with the wind wheel. Under the action of the wind wheel, the high-temperature air in the air passage is blown out from the air outlet, and the outside normal temperature air The air inlet is filled into the air passage, and heat exchange is performed in the air passage, and the outer rotor motor is cooled by means of internal and external air circulation. The outer rotor motor has better heat dissipation performance and a longer service life.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Under the conception of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly/indirectly used in Other relevant technical fields are included in the patent protection scope of the present invention.

Claims (11)

1. An external rotor motor, characterized in that it includes an external rotor assembly, a stator assembly and an annular wind wheel, the external rotor assembly is rotatably sleeved on the stator assembly, and the outer rotor assembly faces the stator An air outlet is formed between one end of the assembly and the stator assembly, the wind wheel is located at the air outlet, the wind wheel is fixedly sleeved on the outer rotor assembly, and the outer rotor assembly faces away from the stator An air inlet is provided at one end of the assembly, and an air passage is provided in the space enclosed by the outer rotor assembly and the stator assembly, and the air inlet and the air outlet are communicated through the air passage. 2. The outer rotor motor according to claim 1, wherein the outer rotor assembly includes a first top wall and a first peripheral wall connected to the first top wall, and the stator assembly includes a first The bottom wall and the second peripheral wall connected with the first bottom wall, the opening end of the first peripheral wall protrudes into the second peripheral wall, the opening end of the first peripheral wall is connected with the first bottom wall The walls are spaced apart, and an annular air outlet is formed between the first peripheral wall and the second peripheral wall, the wind wheel is located in the air outlet, and the air inlet is located in the first top wall. 3. The external rotor motor according to claim 2, wherein the stator assembly further comprises a circuit board, the circuit board is located between the first peripheral wall and the first bottom wall, and the circuit board The board is parallel to the first bottom wall, the opening end of the first peripheral wall is spaced from the circuit board, and the air passage is located between the first top wall, the circuit board and the first peripheral wall. within the area enclosed by the wall. 4. The external rotor motor according to claim 3, wherein the circuit board comprises a board body and electronic components, and the electronic components are arranged on a side of the board body facing the first bottom wall, The electronic components are glued and sealed through the glue layer. 5. The outer rotor motor according to claim 4, wherein the glue filling layer fills the area between the plate body, the first bottom wall and the second peripheral wall, and the glue filling layer The edge of the layer on the side facing the first top wall is at most flush with the side of the plate body facing the first top wall. 6. The external rotor motor according to claim 3, wherein the stator assembly further comprises: A base, one end of the base facing the first top wall is provided with a stator winding, the circuit board is located between the stator winding and the first bottom wall, and the circuit board is sleeved on the base seat; and A bracket, the bracket includes the first bottom wall and the second peripheral wall, and the base is installed in the bracket. 7. The outer rotor motor according to claim 6, wherein the base is provided with a second bearing cavity with an opening facing the first bottom wall, a second bearing is installed in the second bearing cavity, The first top wall is provided with a fixing hole, a rotating shaft is fixed in the fixing hole, one end of the rotating shaft extends into the second bearing cavity, the second bearing is sleeved on the rotating shaft, and the first The bottom wall closes the open end of the second bearing cavity. 8. The outer rotor motor according to claim 7, wherein the base is further provided with a first bearing cavity with an opening facing the first top wall, and a first bearing is installed in the first bearing cavity , the first bearing is sleeved on the rotating shaft. 9. The outer rotor motor according to any one of claims 2 to 8, characterized in that the radial distance between the wind wheel and the second peripheral wall is not greater than 1mm. 10. The outer rotor motor according to any one of claims 1 to 8, characterized in that, The wind wheel is a metal part or a plastic part; and/or The wind wheel is fixed to the outer rotor assembly by bonding or clamping or by locking and screwing. 11. An air conditioner, characterized by comprising the outer rotor motor according to any one of claims 1-10.

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