Outer rotor motor, cross-flow fan and air conditioner

Abstract

The utility model discloses an external rotor motor, a cross-flow fan and an air conditioner, the external rotor motor comprises a rotor and a stator, and the rotor comprises a rotor ring; the stator comprises a stator body and a mounting part, the stator body extends into the rotor ring, the mounting part is located on the axial outer side of the rotor ring and connected with the shaft end of the stator body, and the outer circumferential surface of the mounting part comprises a base surface part and a tangent surface part which are continuously arranged in the circumferential direction of the stator; wherein in the axial projection of the stator, the base surface part is located outside the outer contour of the stator body, a gap is reserved between the tangent surface part and the minimum circumcircle of the tangent surface part, the gap extends from one circumferential end of the tangent surface part to the other circumferential end of the tangent surface part, and at least part of the base surface part falls on the minimum circumcircle, or at least part of the base surface part is located outside the minimum circumcircle. According to the external rotor motor provided by the utility model, because the peripheral surface of the stator is provided with the tangent surface part with a smaller radius, the occupied space is reduced, and the external rotor motor can be used for avoiding other structures, so that the structure of the external rotor motor is more compact, and the miniaturization of the external rotor motor is facilitated; meanwhile, the weight of the mounting part is reduced, and the overall weight reduction of the outer rotor motor is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to an external rotor motor, a cross-flow fan, and an air conditioner. Background Technology

[0002] In related technologies, external rotor motors typically insert the stator into a rotatable rotor and install the stator by setting up a mounting structure that is fixedly connected to the stator. However, the mounting structure is usually in the shape of a rotating body, which is large in size and occupies a lot of space. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes an external rotor motor, wherein the outer peripheral surface of the stator of the external rotor motor has a small-radius cut surface, which reduces the space occupied and can be used to avoid other structures, making the structure of the external rotor motor more compact and conducive to the miniaturization of the external rotor motor; at the same time, it reduces the weight of the mounting part, which is conducive to the overall weight reduction of the external rotor motor.

[0004] This utility model also proposes a cross-flow fan having the aforementioned external rotor motor.

[0005] This utility model also proposes an air conditioner having the above-mentioned cross-flow fan.

[0006] According to a first aspect of the present invention, an external rotor motor includes a rotor and a stator. The rotor includes a rotor ring. The stator includes a stator body and a mounting portion. The stator body extends into the rotor ring. The mounting portion is located axially outside the rotor ring and connected to the axial end of the stator body. The outer peripheral surface of the mounting portion includes a base portion and a cut portion continuously arranged along the circumferential direction of the stator. In the axial projection of the stator, the base portion is located outside the outer contour of the stator body. A gap exists between the cut portion and the smallest circumscribed circle of the cut portion. The gap extends from one circumferential end of the cut portion to the other circumferential end of the cut portion. At least a portion of the base portion falls on the smallest circumscribed circle, or at least a portion is located outside the smallest circumscribed circle.

[0007] According to the present invention, the external rotor motor has a small-radius cut surface on the outer circumference of the stator, which reduces the space occupied and can be used to avoid other structures, making the structure of the external rotor motor more compact and conducive to the miniaturization of the external rotor motor; at the same time, it reduces the weight of the mounting part, which is conducive to the overall weight reduction of the external rotor motor.

[0008] In some embodiments, the cut surface includes a chordal region that extends along the chord of the smallest circumcircle in the axial projection of the stator.

[0009] In some embodiments, the cut surface includes a plurality of chordal regions arranged circumferentially along the stator, the included angle of the plurality of chordal regions being an obtuse angle.

[0010] In some embodiments, the cut surface is composed of two chord regions, wherein the center-to-center distance of one chord region is 0.8-1.2 times that of the center-to-center distance of the other chord region, and the chord length of one chord region is 0.8-1.2 times that of the chord length of the other chord region.

[0011] In some embodiments, the central angle corresponding to the cut surface is not less than 45°; and / or, the central angle corresponding to the cut surface is not greater than 180°.

[0012] In some embodiments, the outer peripheral surface of the mounting portion consists of a cut surface and a base surface, wherein the base surface is an arc in the axial projection of the stator.

[0013] In some embodiments, the outer peripheral surface of the mounting portion includes one cut surface, and two adjacent cut surfaces are connected by the base surface.

[0014] In some embodiments, the central angle corresponding to the base surface is not less than the central angle corresponding to the cut surface; and / or, a plurality of cut surfaces are uniformly arranged along the circumference of the stator.

[0015] In some embodiments, the base surface includes an arcuate region, which is an arc centered at the center of the stator in the axial projection of the stator, and the radius of the base circle containing the arcuate region is greater than or equal to the radius of the smallest circumcircle.

[0016] In some embodiments, the base surface area further includes a convex surface area that is continuously disposed along the circumference of the stator with the arc surface area, and in the axial projection of the stator, the convex surface area is located outside the base circle where the arc surface area is located.

[0017] In some embodiments, the axis of the stator is horizontally arranged, the cut surface is located on one side of the central vertical plane of the stator, the convex region includes a first convex region, in the axial projection of the stator, the first convex region is lower than the cut surface, and the center of the first convex region is located on the same side of the central vertical plane as the cut surface.

[0018] In some embodiments, in the axial projection of the stator, the angle between the line connecting the center of the first convex region and the center of the stator and the central vertical plane is a first angle, which is 10°-30°.

[0019] In some embodiments, the convex region further includes a second convex region. In the axial projection of the stator, the second convex region is higher than the cut surface, and the center of the second convex region and the cut surface are located on opposite sides of the central vertical plane. The first convex region and the cut surface are connected through the arcuate region, and the second convex region and the cut surface are connected through the arcuate region.

[0020] In some embodiments, in the axial projection of the stator, the angle between the line connecting the center of the first convex region and the center of the stator and the central vertical plane is the first angle, and the angle between the line connecting the center of the second convex region and the center of the stator and the central vertical plane is the second angle, wherein the second angle is less than or equal to the first angle.

[0021] In some embodiments, the convex region further includes a third convex region. In the axial projection of the stator, the third convex region and the cut surface are located on opposite sides of the central vertical plane, and in the circumferential direction of the stator, the third convex region is located between the second convex region and the first convex region. The first convex region and the third convex region are connected by the arcuate region, and the second convex region and the third convex region are connected by the arcuate region.

[0022] In some embodiments, in the axial projection of the stator, the central angle between the center of the second convex region and the center of the third convex region is the first central angle, the central angle between the center of the first convex region and the center of the third convex region is the second central angle, and the central angle between the center of the first convex region and the center of the second convex region is the third central angle. The first central angle and the second central angle may be equal or unequal, and both the first central angle and the second central angle are smaller than the third central angle.

[0023] In some embodiments, the convex region is a plurality of adjacent convex regions connected by the arcuate region, and the convex region is connected to the cut surface region by the arcuate region.

[0024] In some embodiments, the motor further includes a stator cover, the stator cover including an annular ring surrounding the mounting portion along the circumference of the stator, the annular ring having a clearance wall formed opposite to the cut surface portion and an arcuate wall formed opposite to the base surface portion and matching the base circle where the arcuate area is located, the arcuate wall having a plurality of limiting grooves corresponding to and engaging with the plurality of convex areas respectively.

[0025] In some embodiments, the radius of the minimum circumscribed circle is greater than or equal to the radius of the stator body; and or, in the axial projection of the stator, the entire base surface falls outside the minimum circumscribed circle.

[0026] A cross-flow fan according to a second aspect of the present invention includes: a fan wheel and a motor, wherein the fan wheel is a cross-flow fan wheel, and the motor is an external rotor motor according to any embodiment of the first aspect of the present invention, wherein the motor is disposed at one axial end of the fan wheel, and the rotor is coaxially disposed and fixedly connected to the fan wheel.

[0027] According to the embodiments of the present invention, the cross-flow fan is provided with an external rotor motor as described in the first aspect embodiment. Since the outer peripheral surface of the stator includes a cut surface, it can avoid collisions, which is beneficial for the compact installation of the cross-flow fan to the outside.

[0028] An air conditioner according to a third aspect of the present invention includes: a fan and a chassis, wherein the fan is a cross-flow fan according to any embodiment of the second aspect of the present invention, the chassis supports the fan, and the chassis has a clearance space formed at the corresponding cut surface, which intrudes toward the cut surface, and the refrigerant pipe of the air conditioner passes through the clearance space.

[0029] According to the present invention, by incorporating the cross-flow fan of the second aspect embodiment described above, the overall structure of the air conditioner is made more compact, and the space occupied by the air conditioner is reduced.

[0030] In some embodiments, the air conditioner is a wall-mounted air conditioner, the cross-flow fan is oriented in the left-right direction, the cut surface is located on the rear side of the stator, and a forward-recessed recess is formed on the rear back plate of the chassis. The recess defines a groove that is open on the rear side. The groove constitutes the clearance space and allows the refrigerant pipe to be completely housed in the clearance space in the front-rear direction.

[0031] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0032] Figure 1 This is an exploded view of a fan according to an embodiment of the present invention;

[0033] Figure 2 yes Figure 1 A schematic diagram of the stator shown;

[0034] Figure 3 yes Figure 2 The front view of the stator shown;

[0035] Figure 4 yes Figure 3 A schematic diagram of the stator dimensions shown;

[0036] Figure 5 This is a front view of the stator according to another embodiment of the present invention;

[0037] Figure 6 yes Figure 2 A schematic diagram of the projected outline of the stator shown;

[0038] Figure 7 This is an exploded view of the stator and stator cover, etc., according to an embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of a portion of the structure of an air conditioner according to an embodiment of the present invention;

[0040] Figure 9 yes Figure 8 The side view shows a portion of the air conditioner shown. Attached image description:

[0042] Air conditioner 100;

[0043] Chassis 10; Space 101;

[0044] Fan 20; Cross-flow fan 20a; Impeller 2; Cross-flow impeller 2a;

[0045] Motor 3; External rotor motor 3a;

[0046] Rotor 31; Rotor ring 311; Shaft 312;

[0047] Stator 32; Stator body 321; Mounting part 322; Shaft hole 323; Central vertical plane S1

[0048] Base surface 3221; curved surface 32211; convex surface 32212;

[0049] First convex region 32213; Second convex region 32214; Third convex region 32215;

[0050] Section 3222; String-shaped region 32221;

[0051] Stator cover 33; Annular ring 333; Arc wall 3331; Clearance wall 3332; Limiting groove 3333;

[0052] Mounting ear 33311; positioning pin 33312; flange 33315; end cap 334;

[0053] First damping component 34; Second damping component 35; Third damping component 36; Sliding bearing 37;

[0054] Screw 40; refrigerant pipe 61. Detailed Implementation

[0055] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0056] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0057] Hereinafter, with reference to the accompanying drawings, an external rotor motor 3a according to a first aspect embodiment of the present invention will be described.

[0058] like Figure 1 and Figure 2 As shown, the external rotor motor 3a includes a rotor 31 and a stator 32. The rotor 31 includes a rotor ring 311, and the stator 32 includes a stator body 321 and a mounting part 322. The stator body 321 extends into the rotor ring 311, and the mounting part 322 is located on the axial outer side of the rotor ring 311 and is connected to the shaft end of the stator body 321.

[0059] For example, see Figure 1 and Figure 2 The stator 32 has a shaft hole 323 at its center, and a sliding bearing 37 is disposed within the shaft hole 323. The rotor ring 311 has a rotating shaft 312 at its center. The rotating shaft 312 is relatively fixed to the rotor ring 311 (for example, it can be directly or indirectly fixed). The rotating shaft 312 is rotatably mounted through the sliding bearing 37 and has a clearance fit with the sliding bearing 37. This allows for relative rotation between the rotor 31 and the stator 32, and helps to reduce the assembly difficulty and improve assembly efficiency. The rotor ring 311 can be an annular magnetic ring, and the stator body 321 can include a stator core and stator windings.

[0060] In the embodiments of this application, since the mounting part 322 is connected to the shaft end of the stator body 321, the mounting part 322 can be located on the axial outside of the rotor ring 311. The mounting part 322 can be used for the installation and fixation of the stator 32 on the one hand, and will not interfere with the rotation of the rotor 31 on the other hand.

[0061] like Figure 2As shown, the outer peripheral surface of the mounting portion 322 includes a base portion 3221 and a cut portion 3222 continuously disposed along the circumferential direction of the stator 32. Figure 2 and Figure 3 In the axial projection of the stator 32 (i.e., the orthographic projection of the stator 32 onto a plane perpendicular to the axis of the stator 32), the base surface 3221 is located outside the outer contour C1 of the stator body 321, and at least a portion of the base surface 3221 falls on the smallest circumcircle C2 of the cut surface 3222, or at least a portion is located outside the smallest circumcircle C2 of the cut surface 3222.

[0062] For example, the stator body 321 may include a stator core, a stator coil and a wrapping element. The stator core and the stator coil form a stator assembly. The wrapping element wraps the stator assembly and defines the outer peripheral surface of the stator body 321. In the axial projection of the stator 32, the projection of the outer peripheral surface of the stator body 321 is the outer contour of the stator body 321.

[0063] In the axial projection of the stator 32, the smallest circumcircle C2 of the cut surface 3222 refers to the circle with the smallest radius that completely encloses the cut surface 3222, with the center of the stator body 321 as the center. Alternatively, it can be described as the circle drawn with the center of the stator body 321 as the center and passing through the point on the cut surface 3222 that is farthest from the center of the stator body 321.

[0064] Combination Figure 2 and Figure 3 In the axial projection of the stator 32, a gap C3 is left between the cut surface 3222 and its smallest circumscribed circle C2. The gap C3 extends from one circumferential end P1 of the cut surface 3222 to the other circumferential end P2. It can be understood that the two ends of the cut surface 3222 in the circumferential direction of the stator 32 are the circumferential end P1 and the other circumferential end P2 of the cut surface 3222.

[0065] Wherein, the gap C3 extends from one circumferential end P1 of the cut surface 3222 to the other circumferential end P2 of the cut surface 3222. This can be understood as follows: during the process of the cut surface 3222 extending from one circumferential end P1 to the other circumferential end P2, it never contacts the smallest circumferential circle C2, so that the gap C3 can always be left between the cut surface 3222 and the smallest circumferential circle C2 in the circumferential extension direction.

[0066] In the above technical solution, since the base surface 3221 is located outside the outer contour C1 of the stator body 321 in the axial projection of the stator 32, and at least part of the base surface 3221 falls on the smallest circumscribed circle C2, or at least part of it is located outside the smallest circumscribed circle C2, the position of the base surface 3221 is relatively outward, which is beneficial to protect the stator body 321, or can be used for the installation of the stator 32.

[0067] Furthermore, in the axial projection of the stator 32, a gap C3 is left between the cut surface 3222 and the smallest circumscribed circle C2 of the cut surface 3222. The gap C3 extends from one circumferential end P1 of the cut surface 3222 to the other circumferential end P2 of the cut surface 3222. Thus, the gap C3 can be used to achieve avoidance, that is, to provide space for avoidance, which helps to optimize the spatial layout of the external rotor motor 3a and improve the compactness and integration of the external rotor motor 3a.

[0068] In short, the stator 32 has a small-radius cut surface on its outer periphery, which reduces the space occupied and can be used to avoid other structures, making the structure of the external rotor motor 3a more compact and conducive to the miniaturization of the external rotor motor 3a; at the same time, it reduces the weight of the mounting part 322, which is conducive to the overall weight reduction of the external rotor motor 3a.

[0069] In some embodiments, combined with Figure 3 The cut surface 3222 includes a chordal region 32221, which extends along the chord of the smallest circumcircle C2 in the axial projection of the stator 32. Therefore, the chordal region 32221 is easier to process; the straight-edged shape has lower processing costs and easier-to-control processing accuracy compared to the complex curved shape, thus helping to improve production efficiency and reduce costs. Furthermore, the straight-edged chordal region 32221 allows for a larger clearance C3, providing more clearance space.

[0070] In some embodiments, combined with Figure 3 The cut surface 3222 includes a plurality of chord-shaped regions 32221 arranged circumferentially along the stator 32, and the included angle θ1 of the plurality of chord-shaped regions 32221 is an obtuse angle. Thus, by using the plurality of the aforementioned chord-shaped regions 32221, the change in the shape of the cut surface 3222 is smaller, which is beneficial to optimizing the stress path of the mounting part 322 and improving the overall strength of the mounting part 322.

[0071] It is worth noting that the chord lengths of multiple chord regions 32221 can be the same or different, and the center distances of multiple chord regions 32221 can be the same or different. These can be reasonably designed according to the needs of structural strength and avoidance. No restrictions are imposed here.

[0072] In some embodiments, combined with Figure 3 and Figure 4 The cross-section 3222 is composed of two chord-shaped regions 32221, and the center-to-center distance of one chord-shaped region 32221 is 0.8-1.2 times that of the center-to-center distance of the other chord-shaped region 32221, and the chord length of one chord-shaped region 32221 is 0.8-1.2 times that of the chord length of the other chord-shaped region 32221. For example Figure 3 and Figure 4The center distance of the chord in the upper chord region 32221 shown is d and the chord length is f; for example Figure 3 and Figure 4 The lower chordal region 32221 shown in the diagram has a center-to-chord distance of e and a chord length of g, with d / e ranging from 0.8 to 1.2 and f / g ranging from 0.8 to 1.2. Therefore, the structure of the cut section 3222 is simple, easy to process, and can effectively balance strong structural strength with a relatively large void C3.

[0073] In some embodiments, combined with Figure 3 The central angle θ2 corresponding to the cut surface 3222 is not less than 45°. Therefore, the range of the cut surface 3222 on the outer peripheral surface of the mounting part 322 is not too small, which is beneficial to increasing the gap C3 and avoiding collisions.

[0074] In some embodiments, combined with Figure 3 The central angle θ2 corresponding to the cut surface 3222 is not greater than 180°. Therefore, the range of the cut surface 3222 on the outer peripheral surface of the mounting part 322 will not be too large, which helps to ensure the structural strength of the mounting part 322 and thus improves the installation reliability of the stator 32.

[0075] In some embodiments, combined with Figure 3 The central angle θ2 corresponding to the cut surface 3222 is not less than 45°, and at the same time, the central angle θ2 corresponding to the cut surface 3222 is not greater than 180°. Therefore, the range of the cut surface 3222 on the outer peripheral surface of the mounting part 322 is neither too small nor too large. This is beneficial on the one hand to increase the gap C3 and facilitate avoidance, and on the other hand to ensure the structural strength of the mounting part 322, thereby improving the installation reliability of the stator 32.

[0076] In some embodiments, the outer peripheral surface of the mounting portion 322 includes up to four cut surfaces 3222, that is, the outer peripheral surface of the mounting portion 322 may have one, two, three, or four cut surfaces 3222. This helps to ensure the structural strength of the mounting portion 322.

[0077] When the outer peripheral surface of the mounting part 322 has a cut surface 3222, for example, the outer peripheral surface of the mounting part 322 consists of a cut surface 3222 and a base surface 3221, and the base surface 3221 is an arc in the axial projection of the stator 32. Thus, both clearance and structural reliability of the mounting part can be well balanced.

[0078] When the outer peripheral surface of the mounting part 322 has two, three, or four cut surfaces 3222, for example, two adjacent cut surfaces 3222 are connected by a base surface 3221. As a result, the mounting part 322 is easy to manufacture and can accommodate avoidance in various directions, making it suitable for a wider range of scenarios.

[0079] When the outer peripheral surface of the mounting part 322 has two, three, or four cut surfaces 3222, exemplarily, in combination with Figure 5 The central angle θ3 corresponding to the base surface 3221 is not less than the central angle θ2 corresponding to the cut surface 3222; thus, while satisfying the avoidance requirement, the structural strength of the mounting part 322 can be guaranteed.

[0080] When the outer peripheral surface of the mounting part 322 has two, three, or four cut surfaces 3222, exemplarily, in combination with Figure 5 The multiple cut surfaces 3222 have the same specifications and are evenly arranged along the circumference of the stator 32, meaning that all cut surfaces 3222 have the same structural dimensions and the circumferential spacing between two adjacent cut surfaces 3222 is the same. This facilitates processing and can improve the structural strength of the mounting part 322.

[0081] When the outer peripheral surface of the mounting part 322 has two, three, or four cut surfaces 3222, exemplarily, in combination with Figure 5 The central angle θ3 corresponding to the base surface 3221 is not less than the central angle θ2 corresponding to the cut surface 3222; and the multiple cut surfaces 3222 have the same specifications and are evenly arranged along the circumference of the stator 32. Thus, while satisfying the avoidance requirement, it facilitates the processing of the mounting part 322 and improves the structural strength of the mounting part 322.

[0082] In some embodiments, combined with Figure 3 The base surface 3221 includes an arc surface region 32211. In the axial projection of the stator 32, the arc surface region 32211 is an arc centered on the center of the stator, and the radius of the base circle containing the arc surface region 32211 is greater than or equal to the radius of the smallest circumcircle C2. This helps to ensure the structural strength of the mounting part 322 and facilitates the machining of the base surface 3221.

[0083] In some embodiments, combined with Figure 3 The base surface 3221 also includes a convex surface region 32212, which is continuously arranged with the arc surface region 32211 along the circumference of the stator 32. In the axial projection of the stator 32, the convex surface region 32212 is located outside the base circle of the arc surface region 32211. Therefore, the structure at the convex surface region 32212 can be used to install the stator 32, thereby reducing the area required for installation and reducing the difficulty of installing the stator 32.

[0084] For example, combined Figure 6The stator 32 has a horizontally oriented axis. The cut surface 3222 is located on one side of the central vertical plane S1 of the stator 32. The central vertical plane S1 is a plane that passes through the axis of the stator 32 and extends vertically. The convex area 32212 includes a first convex area 32213, which is lower than the cut surface 3222 and is located on the same side of the central vertical plane 32. Therefore, the design of the first convex area 32213 can provide reinforcement support on the weakened side of the cut surface 3222, providing good support for the installation of the stator 32 and improving the installation reliability of the stator 32.

[0085] For example, combined Figure 6 In the axial projection of the stator 32, the angle between the line connecting the center of the first convex region 32213 and the center of the stator 32 and the central vertical plane S1 is the first included angle γ1, which is between 10° and 30°. For example, the first included angle γ1 can be 15°, 20°, 25°, or 30°, etc. Therefore, the first convex region 32213 can more effectively provide reinforcement and support on the weakened cut surface 3222 side, providing good support for the installation of the stator 32 and improving the installation reliability of the stator 32.

[0086] In some embodiments, combined with Figure 6 The convex region 32212 also includes a second convex region 32214. In the axial projection of the stator 32, the second convex region 32214 is higher than the cut surface 3222, and the center of the second convex region 32214 and the cut surface 3222 are located on both sides of the central vertical plane S1 (for example, one is on the left side of the central vertical plane S1 and the other is on the right side of the central vertical plane S1). The first convex region 32213 and the cut surface 3222 are connected by the arc surface region 32211, and the second convex region 32214 and the cut surface 3222 are connected by the arc surface region 32211.

[0087] Therefore, the second convex region 32214 can form a support on the opposite side of the first convex region 32213, which is beneficial to increase the installation stability of the stator 32. In particular, when subjected to lateral force or impact force, it can more effectively disperse stress and reduce the risk of damage.

[0088] For example, combined Figure 6 The angle between the line connecting the center of the first convex region 32213 and the center of the stator 32 and the central vertical plane S1 is the first included angle γ1, and the angle between the line connecting the center of the second convex region 32214 and the center of the stator 32 and the central vertical plane S1 is the second included angle γ2. The second included angle γ2 is less than or equal to the first included angle γ1. This helps to improve the installation stability of the stator 32.

[0089] In some embodiments, combined with Figure 6The convex region 32212 also includes a third convex region 32215. In the axial projection of the stator 32, the third convex region 32215 and the cut surface 3222 are located on both sides of the central vertical plane (for example, one is on the left side of the central vertical plane S1 and the other is on the right side of the central vertical plane S1). In the circumferential direction of the stator 32, the third convex region 32215 is located between the second convex region 32214 and the first convex region 32213. The first convex region 32213 and the third convex region 32215 are connected by the arc surface region 32211, and the second convex region 32214 and the third convex region 32215 are connected by the arc surface region 32211.

[0090] Therefore, by setting a third convex region 32215 and arranging it circumferentially between the first convex region 32213 and the second convex region 32214, it works in conjunction with the first convex region 32213 and the second convex region 32214 to form a more stable support structure, providing a more comprehensive and effective fixation and support for the stator 32. This design not only enhances the stability of the stator 32 structure but also allows the stator 32 to be more firmly fixed in the predetermined position, reducing the risk of displacement caused by vibration or external forces, thereby improving the smoothness and reliability of the external rotor motor 3a.

[0091] In some embodiments, combined with Figure 6 In the axial projection of the stator 32, the central angle between the center of the second convex region 32214 and the center of the third convex region 32215 is the first central angle β1, the central angle between the center of the first convex region 32213 and the center of the third convex region 32215 is the second central angle β2, and the central angle between the center of the first convex region 32213 and the center of the second convex region 32214 is the third central angle β3. The first central angle β1 and the second central angle β2 are equal or unequal, and both the first central angle β1 and the second central angle β2 are smaller than the third central angle β3.

[0092] Therefore, by adjusting the size of the central angle between each convex area, the distribution of each convex area in the circumferential direction of the stator 32 can be adjusted, so that when the stator 32 is subjected to external force, each convex area can evenly share the stress, thereby improving the stability of the entire structure. The first central angle β1 and the second central angle β2 are both smaller than the third central angle β3, which is conducive to making full use of the circumferential space of the stator 32 and leaving enough space for the cut surface 3222, thereby making the overall structure of the stator 32 more reasonable and conducive to the installation stability of the stator 32.

[0093] In some embodiments, combined with Figure 6The convex area 32212 consists of multiple adjacent convex areas 32212 connected by an arc area 32211, and the convex area 32212 is connected to the cut surface 3222 by an arc area 32211. This facilitates the processing of the mounting part 322 and helps improve the installation stability of the stator 32.

[0094] For example, combined Figure 7 The motor 3 also includes a stator cover 33, which includes an annular ring 333 that surrounds the mounting portion 322 around the stator 32 in the circumferential direction. The annular ring 333 forms a clearance wall 3332 that matches the cut surface 3222 at the location opposite to the cut surface 3222. The annular ring 333 forms an arc wall 3331 that matches the base circle where the arc surface area 32211 is located at the location opposite to the base surface area 32211. The arc wall 3331 has a plurality of limiting grooves 3333 that correspond to and cooperate with the plurality of convex surface areas 32212 respectively.

[0095] Therefore, the mounting part 322 can be protected and installed by the annular ring 333. By setting the above-mentioned shape matching, the space outside the avoidance wall 3332 can be used for avoidance, and the tightness of the fit between the two can be improved. In addition, by setting multiple convex areas 32212 and multiple limiting grooves 3333 to fit one-to-one, the mounting part 322 can be reliably fitted within the annular ring 333 and will not rotate relative to the annular ring 333.

[0096] In some embodiments, combined with Figure 3 The radius of the smallest circumscribed circle C2 is greater than or equal to the radius of the stator body 321. Therefore, the mounting portion 322 has better structural strength, and the stator 32 has better installation stability. Of course, this application is not limited to this; for example, in other embodiments of this application, the radius of the smallest circumscribed circle C2 may be smaller than the radius of the stator body 321, thereby enabling a wider range of obstacle avoidance.

[0097] In some embodiments, combined with Figure 3 In the axial projection of the stator 32, the entire base portion 3221 falls outside the smallest circumcircle C2. Therefore, the mounting portion 322 has better structural strength, and the stator 32 has better installation stability.

[0098] In some embodiments, combined with Figure 3 The radius of the smallest circumcircle C2 is greater than or equal to the radius of the stator body 321, and in the axial projection of the stator 32, the entire base portion 3221 falls outside the smallest circumcircle C2. Therefore, the mounting portion 322 has better structural strength, and the stator 32 has better installation stability.

[0099] This utility model also proposes a cross-flow fan 20a having the aforementioned external rotor motor 3a.

[0100] In some embodiments of this application, see Figure 1 and Figure 2 The cross-flow fan 20a includes a fan wheel 2 and a motor 3. The fan wheel 2 is a cross-flow fan wheel 2a, and the motor 3 is an external rotor motor 3a of any of the above embodiments. The motor 3 is located at one axial end of the fan wheel 2, and the rotor 31 is coaxially arranged and fixedly connected to the fan wheel 2.

[0101] According to the present invention, the cross-flow fan 20a, by providing an external rotor motor 3a in any embodiment, and since the rotor 31 is fixedly connected to the impeller 2, it is beneficial to shorten the axial length of the cross-flow fan 20a. Moreover, since the outer peripheral surface of the stator 32 includes a cut surface 3222, it is possible to avoid collisions, thereby facilitating the compact installation of the cross-flow fan 20a to the outside.

[0102] This utility model also proposes an air conditioner 100 having the above-mentioned cross-flow fan 20a.

[0103] In some embodiments of this application, see Figure 8 The air conditioner 100 includes a fan 20 and a chassis 10. The fan 20 is a cross-flow fan 20a according to any of the above embodiments. The chassis 10 supports the fan 20, and the chassis 10 has a clearance space 101 formed at the corresponding cross-section 3222, which intrudes toward the cross-section 3222. The refrigerant pipe 61 of the air conditioner 100 passes through the clearance space 101. The configuration of the clearance space 101 is not limited. For example, it can be formed by partially penetrating the chassis 10, with the side of the penetrating position near the motor 3 left empty. Alternatively, it can be formed by recessing a part of the chassis 10 toward the motor 3, creating a groove that opens toward the direction away from the motor 3. The groove constitutes the clearance space 101.

[0104] Therefore, since the stator 32 has a cut surface 3222, the chassis 10 can form a clearance space 101 that intrudes into the cut surface 3222 at the corresponding cut surface 3222, so that at least part of the refrigerant pipe 61 can occupy the space enclosed by the outer contour of the chassis 10, thereby reducing the space occupied by the refrigerant pipe 61 in the direction of intrusion of the clearance space 101, reducing the overall size of the air conditioner 100 in the direction of intrusion of the clearance space 101, and also eliminating the need for this part of the refrigerant pipe 61 to occupy the space on the outer side of the fan 20, which helps to reduce the overall size of the air conditioner 100 in the axial direction of the fan 20, thereby facilitating the miniaturization of the air conditioner 100 and reducing the space occupied by the air conditioner 100.

[0105] In some embodiments, see Figure 1 and combined Figure 8 and Figure 9The air conditioner 100 is a wall-mounted air conditioner. The cross-flow fan 20a has an axial direction in the left-right direction, and its cross-section 3222 is located on the rear side of the stator 32. A forward-recessed recess is formed on the rear plate of the chassis 10, which defines a rear-open groove. The groove forms a clearance space 101, and the refrigerant pipe 61 is completely contained in the clearance space 101 in the front-back direction. As a result, the refrigerant pipe 61 is prevented from protruding from the rear plate of the chassis 10, so that the rear plate of the chassis 10 can be installed against the wall, reducing the size of the air conditioner 100 in the front-back direction. Moreover, the refrigerant pipe 61 does not occupy the outer space of the fan 20 in the axial direction, thereby reducing the size of the air conditioner 100 in the axial direction (i.e., the left-right direction).

[0106] It is worth noting that the installation method of motor 3 is not limited. For example, motor 3 can be fixedly installed on chassis 10 through stator cover 33. For example, the annular ring 333 of stator cover 33 can have two mounting ears 33311 for fixed installation with chassis 10, and a positioning pin 33312 located between the two mounting ears. The positioning pin 33312 is positioned and engaged with the positioning groove on chassis 10. The mounting ears 33311 are fixedly connected to the mounting structure on chassis 10 by fasteners, which can improve assembly efficiency and the installation stability of stator cover 33 is good, which is conducive to improving the coaxiality of motor 3 and fan 2.

[0107] It is worth noting that the installation method of stator 32 and stator cover 33 is not limited. For example, one axial end of annular ring 333 has a flange 33315, and stator cover 33 also includes a cover end cap 334 covering the other axial end of annular ring 333. The mounting part 322 is inserted into annular ring 333 until it is axially connected with flange 33315. Then the cover end cap 334 is fixed to the other axial end of annular ring 333 so that it is clamped together with flange 33315 on both axial sides of mounting part 322.

[0108] For example, the end cap 334 can be embedded within the annular ring 333, and the end cap 334 and the annular ring 333 are connected by screws extending axially along the stator 32. To facilitate the installation of the end cap 334, the end cap 334 can be configured to match the shape of the annular ring 333. For example, the end cap 334 may also form a cross-section that matches the clearance wall 3332 of the corresponding annular ring 333.

[0109] In addition, to improve the vibration reduction effect, a first vibration damping component 34 can be provided between the mounting ear 33311 and the chassis 10, a second vibration damping component 35 can be provided between the positioning pin 33312 and the chassis 10, and a third vibration damping component 36 can be provided between the mounting part 322 and the stator cover 33.

[0110] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0111] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0112] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0113] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0114] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0115] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An external rotor motor, characterized in that, include: Rotor, the rotor including rotor rings; The stator includes a stator body and a mounting portion. The stator body extends into the rotor ring, and the mounting portion is located on the axial outer side of the rotor ring and connected to the shaft end of the stator body. The outer peripheral surface of the mounting portion includes a base portion and a cut portion continuously arranged along the circumference of the stator. In the axial projection of the stator, the base surface is located outside the outer contour of the stator body, and there is a gap between the cut surface and the smallest circumscribed circle of the cut surface. The gap extends from one circumferential end of the cut surface to the other circumferential end of the cut surface. At least a portion of the base surface falls on the smallest circumscribed circle, or at least a portion is located outside the smallest circumscribed circle.

2. The external rotor motor according to claim 1, characterized in that, The cut surface includes a chordal region that extends along the chord of the smallest circumcircle in the axial projection of the stator.

3. The external rotor motor according to claim 2, characterized in that, The cut surface includes a plurality of chordal regions arranged circumferentially along the stator, and the included angle of the plurality of chordal regions is an obtuse angle.

4. The external rotor motor according to claim 3, characterized in that, The cut surface is composed of two chord-shaped regions, and the center-to-center distance of one of the chord-shaped regions is 0.8-1.2 times that of the center-to-center distance of the other chord-shaped region, and the chord length of one of the chord-shaped regions is 0.8-1.2 times that of the chord length of the other chord-shaped region.

5. The external rotor motor according to claim 1, characterized in that, The central angle corresponding to the cut surface is not less than 45°; and / or, the central angle corresponding to the cut surface is not greater than 180°.

6. The external rotor motor according to claim 5, characterized in that, The outer peripheral surface of the mounting part consists of a cut surface and a base surface, wherein the base surface is an arc in the axial projection of the stator.

7. The external rotor motor according to claim 1, characterized in that, The outer peripheral surface of the mounting part includes 2-4 cut surfaces, and two adjacent cut surfaces are connected by the base surface.

8. The external rotor motor according to claim 7, characterized in that, The central angle corresponding to the base surface is not less than the central angle corresponding to the cut surface; and / or, a plurality of the cut surfaces are uniformly arranged along the circumference of the stator.

9. The external rotor motor according to claim 1, characterized in that, The base surface includes an arc-shaped area. In the axial projection of the stator, the arc-shaped area is an arc with the center of the stator as the center, and the radius of the base circle in which the arc-shaped area is located is greater than or equal to the radius of the smallest circumscribed circle.

10. The external rotor motor according to claim 9, characterized in that, The base surface also includes a convex surface area that is continuously disposed along the circumference of the stator with the arc surface area. In the axial projection of the stator, the convex surface area is located outside the base circle where the arc surface area is located.

11. The external rotor motor according to claim 10, characterized in that, The axis of the stator is horizontally arranged, the cut surface is located on one side of the central vertical plane of the stator, the convex area includes a first convex area, in the axial projection of the stator, the first convex area is lower than the cut surface, and the center of the first convex area is located on the same side of the central vertical plane as the cut surface.

12. The external rotor motor according to claim 11, characterized in that, In the axial projection of the stator, the angle between the line connecting the center of the first convex region and the center of the stator and the central vertical plane is the first angle, which is 10°-30°.

13. The external rotor motor according to claim 11, characterized in that, The convex region further includes a second convex region. In the axial projection of the stator, the second convex region is higher than the cut surface, and the center of the second convex region and the cut surface are located on opposite sides of the central vertical plane. The first convex region and the cut surface are connected through the arc surface region, and the second convex region and the cut surface are connected through the arc surface region.

14. The external rotor motor according to claim 13, characterized in that, In the axial projection of the stator, the angle between the line connecting the center of the first convex region and the center of the stator and the central vertical plane is the first angle, and the angle between the line connecting the center of the second convex region and the center of the stator and the central vertical plane is the second angle, and the second angle is less than or equal to the first angle.

15. The external rotor motor according to claim 13, characterized in that, The convex region also includes a third convex region. In the axial projection of the stator, the third convex region and the cut surface are located on both sides of the central vertical plane. In the circumferential direction of the stator, the third convex region is located between the second convex region and the first convex region. The first convex region and the third convex region are connected through the arcuate region. The second convex region and the third convex region are connected through the arcuate region.

16. The external rotor motor according to claim 15, characterized in that, In the axial projection of the stator, the central angle between the center of the second convex region and the center of the third convex region is the first central angle, the central angle between the center of the first convex region and the center of the third convex region is the second central angle, and the central angle between the center of the first convex region and the center of the second convex region is the third central angle. The first central angle and the second central angle may be equal or unequal, and both the first central angle and the second central angle are smaller than the third central angle.

17. The external rotor motor according to claim 10, characterized in that, The convex area is a plurality of adjacent convex areas connected by the arc area, and the convex area and the cut surface are connected by the arc area.

18. The external rotor motor according to claim 17, characterized in that, The motor also includes a stator cover, which includes an annular ring surrounding the mounting portion along the circumference of the stator. The annular ring is formed with a clearance wall that matches the cut surface at the location opposite to the cut surface, and an arcuate wall that matches the base circle where the arcuate area is located at the location opposite to the base surface. The arcuate wall has multiple limiting grooves that correspond to and cooperate with the multiple convex areas respectively.

19. The external rotor motor according to claim 1, characterized in that, The radius of the minimum circumscribed circle is greater than or equal to the radius of the stator body; and or, in the axial projection of the stator, the entire base surface falls outside the minimum circumscribed circle.

20. A cross-flow fan, characterized in that, include: The wind turbine and the motor are provided, wherein the wind turbine is a cross-flow wind turbine, and the motor is an external rotor motor according to any one of claims 1-19. The motor is located at one axial end of the wind turbine, and the rotor is coaxially arranged and fixedly connected to the wind turbine.

21. An air conditioner, characterized in that, include: The fan and chassis, wherein the fan is a cross-flow fan according to claim 20, the chassis supports the fan, and the chassis has a clearance space that intrudes toward the cut surface at the corresponding cut surface, and the refrigerant pipe of the air conditioner passes through the clearance space.

22. The air conditioner according to claim 21, characterized in that, The air conditioner is a wall-mounted air conditioner. The axis of the cross-flow fan is in the left-right direction. The cut surface is located on the rear side of the stator. A forward-recessed recess is formed on the rear back plate of the chassis. The recess defines a groove that is open on the rear side. The groove constitutes the clearance space and allows the refrigerant pipe to be completely contained in the clearance space in the front-back direction.

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