Outer rotor motor for cross-flow fan

Abstract

The utility model relates to an external rotor motor for a cross-flow fan, and the motor comprises an external rotor assembly which is fixedly disposed at the end part of an impeller of the cross-flow fan; the inner stator assembly is partially arranged in the outer rotor assembly; the sliding bearing is arranged outside a rotating shaft at the end part of the impeller in a sleeving manner and is positioned in the inner stator assembly; and the buffer suite comprises a suite body which is arranged on the sliding bearing in a sleeving manner and is in interference fit with the sliding bearing, and a plurality of buffer convex edges which are arranged on the peripheral surface of the suite body at intervals in the axial direction or the circumferential direction and are used for abutting against the inner stator assembly, and the buffer suite is made of a rubber material or a silica gel material. According to the external rotor motor, vibration and noise of the stator assembly in the cross-flow fan can be effectively reduced, durability of the sliding bearing is improved, the service life of the external rotor motor and the service life of the cross-flow fan are prolonged, and stability of the external rotor motor and the cross-flow fan is improved.

Description

Technical Field

[0001] The embodiments of the present utility model relate to the field of cross-flow fans. More specifically, the present utility model relates to an external rotor motor for a cross-flow fan. Background Art

[0002] In the existing cross-flow fan technology field, especially those devices driven by external rotor motors, although they are favored for their characteristics such as compact structure, abundant air volume, and high efficiency, they still need to face some obvious technical problems during actual application.

[0003] The related external rotor motor includes an external rotor assembly fixedly arranged at the end of the impeller of the cross-flow fan, an inner stator assembly partially arranged inside the external rotor assembly, and a sliding bearing sleeved outside the rotating shaft at the end of the impeller and located inside the inner stator assembly. Among them, the sliding bearing, as a support element between the inner stator assembly and the rotating shaft of the impeller, is used to reduce the friction when the rotating shaft rotates inside the inner stator assembly. During use, the external rotor assembly rotates relative to the inner stator assembly under the action of magnetic force, and the rotating external rotor assembly can also drive the impeller to rotate in the air duct housing of the cross-flow fan through the rotating shaft and prompt the cross-flow fan to generate wind.

[0004] However, when starting or stopping the external rotor motor, both the external rotor assembly and the inner stator assembly are prone to vibration. The vibration of the external rotor assembly not only affects the impeller, the rotating shaft, and the sliding bearing, but may also be transmitted to the inner stator assembly through them, thereby exacerbating the vibration of the inner stator assembly. This vibration not only causes noise in the cross-flow fan, but may also have a negative impact on its stability and service life. In addition, this vibration may also cause a certain impact on the sliding bearing in the external rotor motor, resulting in increased wear during use and shortening its service life. Summary of the Utility Model

[0005] The present utility model provides an external rotor motor for a cross-flow fan, which can effectively reduce the vibration and noise of the stator assembly in the cross-flow fan, improve the durability of the sliding bearing, and is beneficial to enhancing the service life and stability of the external rotor motor and the cross-flow fan.

[0006] The present utility model provides an external rotor motor for a cross-flow fan. The external rotor motor includes: an external rotor assembly fixedly arranged at the end of the impeller of the cross-flow fan; an inner stator assembly partially arranged inside the external rotor assembly; a sliding bearing sleeved outside the rotating shaft at the end of the impeller and located inside the inner stator assembly; a buffer kit including a kit body sleeved on the sliding bearing and in interference fit with the sliding bearing, and a plurality of buffer ridges arranged at intervals along the axial or circumferential direction on the outer peripheral surface of the kit body and used to abut against the inner stator assembly, wherein the buffer kit is made of rubber material or silica gel material.

[0007] Further, a plurality of the buffer ridges are uniformly arranged along the circumferential direction of the kit body, and each of the buffer ridges extends along the axial direction of the kit body.

[0008] Further, the inner stator assembly includes a plastic-encapsulated housing having a central hole. The central hole includes a large-diameter section, a small-diameter section coaxially connected to the large-diameter section and farther from the impeller than the large-diameter section, and a first clamping structure provided on the small-diameter section. The kit body includes a large-diameter portion fitted into the large-diameter section of the central hole and for carrying the sliding bearing, a small-diameter portion fitted into the small-diameter section of the central hole and coaxially connected to the large-diameter portion, and a second clamping structure provided on the small-diameter portion and cooperating with the first clamping structure.

[0009] Further, one of the first clamping structure and the second clamping structure is a clamping groove, and the other of the first clamping structure and the second clamping structure is a clamping protrusion.

[0010] Further, a first chamfer is provided at one end of the large-diameter portion away from the impeller, and a second chamfer is provided at one end of the small-diameter portion away from the impeller.

[0011] Further, the kit body includes a ball socket surface, and the sliding bearing includes a spherical outer peripheral surface that is in mating contact with the ball socket surface of the kit body.

[0012] Further, the sliding bearing further includes a circular inner peripheral surface that is in mating contact with the outer peripheral surface of the rotating shaft and has an oil release port, an oil storage cavity formed between the circular inner peripheral surface and the spherical outer peripheral surface and communicating with the oil release port, and a lubricating grease filled in the oil storage cavity.

[0013] Further, the sliding bearing further includes a circular inner peripheral surface that is in mating contact with the outer peripheral surface of the rotating shaft and has an oil release port, an oil storage cavity formed between the circular inner peripheral surface and the spherical outer peripheral surface and communicating with the oil release port, and a lubricating grease filled in the oil storage cavity.

[0014] Further, the outer rotor assembly includes a magnetic ring fixed to an end of the impeller of the cross-flow fan. The magnetic ring is sleeved outside the stator core of the inner stator assembly and is coaxial with the impeller.

[0015] Further, the sliding bearing is made of a resin material or a metal material.

[0016] After the inventor's careful research and creative work, the present utility model proposes improvements to the external rotor motor of the cross-flow fan. Specifically, a buffer kit is introduced between the sliding bearing and the inner stator assembly. This buffer kit can absorb and relieve the vibration transmitted from the external rotor assembly to the inner stator assembly through the sliding bearing, thereby effectively reducing the vibration and noise of the stator assembly in the cross-flow fan. In this way, not only can the operating stability of the cross-flow fan be improved, but also its service life can be extended. At the same time, the buffer kit can effectively absorb the vibration from the inner stator assembly and the external rotor assembly, thereby reducing the impact on the sliding bearing, enhancing the durability of the sliding bearing, and further contributing to the extension of the service life of the cross-flow fan. In addition, the buffer ridges applied in the buffer kit can further improve the elastic deformation ability and damping characteristics of the buffer kit, not only further reducing the vibration and noise of the stator assembly in the cross-flow fan, but also further enhancing the durability of the sliding bearing and once again extending the service life of the cross-flow fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By referring to the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present utility model will become readily understood. In the drawings, several embodiments of the present utility model are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0018] Figure 1 is an installation schematic diagram of the external rotor motor for a cross-flow fan according to an embodiment of the present utility model;

[0019] Figure 2 is Figure 1 an exploded view of the shown external rotor motor;

[0020] Figure 3 is Figure 1 a side view of the shown external rotor motor;

[0021] Figure 4 is a sectional view along Figure 3 line A-A in

[0022] Figure 5 shows Figure 1 a sectional view of a buffer kit adapted to the shown external rotor motor;

[0023] Figure 6 is Figure 1 a three-dimensional schematic diagram of the sliding bearing in the shown external rotor motor.

[0024] Explanation of the reference numerals in the accompanying drawings: 1. outer rotor assembly; 11. magnetic ring; 12. impeller; 121. rotating shaft; 2. inner stator assembly; 21. center hole; 211. large diameter section; 212. small diameter section; 213. first clamping structure; 22. plastic-sealed shell; 23. stator core; 24. winding; 3. sliding bearing; 31. spherical outer peripheral surface; 32. circular inner peripheral surface; 321. oil release port; 322. oil containing chamber; 4. buffer kit; 41. kit body; 411. large diameter portion; 412. small diameter portion; 413. second clamping structure; 414. first chamfer; 415. second chamfer; 42. buffer ridge; 43. socket surface. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0026] The utility model discloses an outer rotor motor for a cross-flow fan.

[0027] Reference Figure 1 and Figure 2 The outer rotor motor includes an outer rotor assembly 1 fixedly mounted on the end of the impeller 12 of the crossflow fan, and an inner stator assembly 2 partially disposed inside the outer rotor assembly 1. As an example, the outer rotor assembly 1 specifically includes a magnetic ring 11 fixedly connected to the end of the impeller 12 of the crossflow fan, and the magnetic ring 11 is coaxial with the impeller 12. When current is passed through the inner stator assembly 2, the inner stator assembly 2 generates a magnetic field, and the outer rotor assembly 1 with the magnetic ring 11 drives the impeller 12 to rotate in the air duct housing of the crossflow fan under the action of the magnetic field, thereby realizing the blowing or exhausting function of the crossflow fan.

[0028] Reference Figure 2 , Figure 3 and Figure 4 As an example, the inner stator assembly 2 includes a plastic-encapsulated shell 22 disposed inside the magnetic ring 11 and having a center hole 21, a stator core 23 buried in the plastic-encapsulated shell 22, and a winding 24 wound on the stator core 23. When in use, the winding 23 can generate a magnetic field required for driving the outer rotor assembly 1 to rotate with the assistance of the stator core 23 after being energized. Among them, the plastic-encapsulated shell 22 can be connected to the casing of the outer rotor motor by means of bolts, snaps or adhesives. The application of the plastic-encapsulated shell 21 in the inner stator assembly 2 not only achieves a high degree of integration and sealing, but also effectively isolates the external environment from erosion of the inner stator assembly 2, especially impurities such as water vapor and dust, thereby significantly improving the operating stability and service life of the outer rotor motor.

[0029] Referring to Figure 2 and Figure 4 Figure 4

[0030] The external rotor motor further includes a sliding bearing 3. The sliding bearing 3 is sleeved outside the rotating shaft 121 at the end of the impeller 12 and inside the inner stator assembly 2, specifically in the central hole 21 of the plastic encapsulation housing 22 of the inner stator assembly 2. The sliding bearing 3 serves as a support element between the inner stator assembly 2 and the rotating shaft 121 of the impeller 12, and is used to reduce the friction when the rotating shaft 121 rotates inside the inner stator assembly 2. The sliding bearing 3 can be made of metal materials such as bearing alloy, copper-based alloy, aluminum-based alloy, wear-resistant cast iron or stainless steel, or can be made of non-metal materials such as plastic, rubber, hardwood or resin material, or can also be made of composite materials composed of the above metal materials and non-metal materials.

[0031] The external rotor motor further includes a buffer kit 4 provided between the sliding bearing 3 and the plastic encapsulation housing 22 of the inner stator assembly 2, and the buffer kit 4 is made of high-elastic materials such as rubber material or silica gel material. The buffer kit 4 can absorb and relieve the vibration transmitted from the external rotor assembly 1 to the inner stator assembly 2 through the sliding bearing 3, thereby effectively reducing the vibration and noise of the stator assembly 2 in the cross-flow fan. In this way, not only can the operation stability of the cross-flow fan be improved, but also the service life thereof is facilitated to be extended. At the same time, the buffer kit 4 can effectively absorb the vibration from the inner stator assembly 2 and the external rotor assembly 1, thereby reducing the impact on the sliding bearing 3, enhancing the durability of the sliding bearing 3, and further facilitating the improvement of the service life of the cross-flow fan.

[0032] Referring to Figure 2 and Figure 5, as an example, a plurality of buffer ridges 42 are uniformly arranged along the circumferential direction of the kit body 41, and each buffer ridge 42 extends along a direction parallel to the axial direction of the kit body 41. As another example, a plurality of buffer ridges 42 are uniformly distributed along the axial direction of the kit body 41, and each buffer ridge 42 extends along the circumferential direction of the kit body 41. Thus, the plurality of buffer ridges 42 mentioned in the above two examples can improve the elastic deformation ability and damping characteristics of the buffer kit 4, but the buffer ridges 42 extending along the direction parallel to the axial direction of the kit body 41 are more conducive to the assembly of the buffer kit 4 in the inner stator assembly 2.

[0033] Referring to Figure 4 and Figure 5 , the central hole 21 of the inner stator assembly 2 includes a large-diameter section 211, a small-diameter section 212 coaxially connected to the large-diameter section 211 and farther from the impeller 12 than the large-diameter section 211, and a first clamping structure 213 provided on the small-diameter section 212. The kit body 41 includes a large-diameter portion 411 fitted into the large-diameter section 211 of the central hole 21 and used for carrying the sliding bearing 3, a small-diameter portion 412 fitted into the small-diameter section 212 of the central hole 21 and coaxially connected to the large-diameter portion 411, and a second clamping structure 413 provided on the small-diameter portion 412 and cooperating with the first clamping structure 213.

[0034] The first clamping structure 213 and the second clamping structure 413 cooperate with each other to fix the kit body 41 in the central hole 21 of the plastic-sealed housing 22, reducing the probability of the kit body 41 slipping out of the central hole 21 of the plastic-sealed housing 22. By dividing the kit body 41 into the large-diameter portion 411 and the small-diameter portion 412, a positioning basis can be provided for assembling the kit body 41. That is, during assembly, when the large-diameter portion 411 completely enters the large-diameter section 211, it can be determined that the assembly is in place. At this time, the small-diameter portion 412 completely enters the small-diameter section 212 and is fixed by the first clamping structure 213 and the second clamping structure 213. At this time, the two-way axial fixation of the kit body 41 can be achieved, and the assembly method is simple without consuming additional human and material costs.

[0035] Referring to Figure 4 and Figure 5, one of the first clamping structure 213 and the second clamping structure 413 is a clamping groove, and the other of the first clamping structure 213 and the second clamping structure 413 is a clamping projection. A first chamfer 414 is provided at one end of the large-diameter portion 411 away from the impeller 12, and a second chamfer 415 is provided at one end of the small-diameter portion 412 away from the impeller 12. The form of mutual cooperation between the clamping groove and the clamping projection is used to facilitate disassembly and assembly. The setting of the first chamfer 414 provides guidance for the large-diameter portion 411 to enter the large-diameter section 211. The setting of the second chamfer 415 provides guidance for the small-diameter portion 412 to enter the small-diameter section 212. When assembling, the kit body 41 does not need to be completely aligned with the central hole 21. The small-diameter portion 412 can smoothly enter the small-diameter section 212 under the guiding action of the second chamfer 415, and the large-diameter portion 411 can enter the large-diameter section 211 under the action of the first chamfer 414, reducing the difficulty of assembling the kit body 41.

[0036] Referring to Figure 4 , Figure 5 and Figure 6 , the buffer kit 4 includes a ball socket surface 43. The sliding bearing 3 includes a spherical outer peripheral surface 31 that is in mating contact with the ball socket surface 43 of the buffer kit 4, a circular inner peripheral surface 32 that is in mating contact with the outer peripheral surface of the rotating shaft 121 and has an oil release port 321, an oil storage cavity 322 formed between the circular inner peripheral surface 32 and the spherical outer peripheral surface 31 and communicating with the oil release port 321, and grease filled in the oil storage cavity 322. When in use, the rotating shaft 121 rotates in the sliding bearing 3, and the grease in the oil storage cavity 322 enters between the sliding bearing 3 and the rotating shaft 121 through the oil release port 321 and forms a stable lubricating oil film here, ensuring that the rotating shaft 121 can rotate smoothly, stably and with low friction in the sliding bearing 3. The spherical outer peripheral surface of the sliding bearing 3 and the ball socket surface 43 of the buffer kit 4 adopt a spherical surface fit, ensuring that while the sliding bearing 3 bears radial loads, it has a certain self-adjusting ability, that is, it can automatically compensate for assembly errors such as axial dimensions and coaxiality between the rotating shaft 121 and the inner stator assembly 2, which is beneficial to improving the yield rate and production efficiency of the outer rotor motor.

[0037] Preferably, a plurality of oil storage cavities 322 are provided, and the plurality of oil storage cavities 322 are arranged in a circumferential array centered on the axis of the rotating shaft 121. Correspondingly, the oil release ports 321 are provided with the same number corresponding to the oil storage cavities 322, thereby further improving the lubrication effect.

[0038] The outer rotor motor for a cross-flow fan mentioned in the embodiment of the present invention can effectively reduce the vibration and noise of the stator assembly 2 in the cross-flow fan and improve the durability of the sliding bearing 3, which is beneficial to improving the service life and stability of the outer rotor motor and the cross-flow fan.

[0039] In the above description of the present application, unless otherwise clearly specified and defined, terms such as "fixed", "installed", "connected" or "coupled" should be understood in a broad sense. For example, with respect to the term "connected", it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the communication inside two components or the interaction relationship between two components. Therefore, unless otherwise clearly defined in the present application, those skilled in the art can understand the specific meanings of the above terms in the present utility model according to specific circumstances.

[0040] Based on the above description of the present application, those skilled in the art can also understand the terms used as follows. For example, terms indicating orientation or positional relationships such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise" are based on the orientation or positional relationships shown in the drawings of the present application. These are only for the purpose of facilitating the description of the solution of the present utility model and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in the specific orientation. Therefore, the above terms of orientation or positional relationships cannot be understood or interpreted as limitations on the solution of the present utility model.

[0041] In addition, terms such as "first" or "second" used in the present application to refer to numbers or ordinals are only for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0042] Although multiple embodiments of the present utility model have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art can envision many variations, changes and alternative ways without departing from the spirit and scope of the present utility model. It should be understood that various alternative embodiments of the present utility model described herein can be employed in the practice of the present utility model. The appended claims are intended to define the scope of protection of the present utility model and thus cover equivalents or alternative embodiments within the scope of these claims.

Claims

1. An external rotor motor for a cross-flow fan, characterized in that, The outer-rotor motor includes: An outer-rotor assembly fixedly provided at an end of an impeller of the cross-flow fan; An inner-stator assembly, a part of which is disposed inside the outer-rotor assembly; A sliding bearing sleeved outside a rotating shaft at an end of the impeller and located inside the inner-stator assembly; A buffer kit including a kit body sleeved on the sliding bearing and in interference fit with the sliding bearing, and a plurality of buffer ridges arranged at intervals along an axial direction or a circumferential direction on an outer peripheral surface of the kit body and used for abutting against the inner-stator assembly, wherein the buffer kit is made of a rubber material or a silica gel material.

2. The outer rotor motor according to claim 1, wherein, The plurality of buffer ridges are uniformly arranged along the circumferential direction of the kit body, and each of the buffer ridges extends along the axial direction of the kit body.

3. The external rotor motor according to claim 2, characterized in that, The inner-stator assembly includes a plastic-sealed housing having a central hole, the central hole including a large-diameter section, a small-diameter section coaxially connected to the large-diameter section and farther from the impeller than the large-diameter section, and a first clamping structure provided on the small-diameter section, the kit body including a large-diameter portion fitted into the large-diameter section of the central hole and used for bearing the sliding bearing, a small-diameter portion fitted into the small-diameter section of the central hole and coaxially connected to the large-diameter portion, and a second clamping structure provided on the small-diameter portion and cooperating with the first clamping structure.

4. The outer rotor motor according to claim 3, wherein, One of the first clamping structure and the second clamping structure is a clamping groove, and the other of the first clamping structure and the second clamping structure is a clamping protrusion.

5. The outer rotor motor according to claim 3, characterized in that, A first chamfer is provided at an end of the large-diameter portion away from the impeller, and a second chamfer is provided at an end of the small-diameter portion away from the impeller.

6. The outer rotor motor according to claim 2, characterized in that, The kit body includes a ball socket surface, and the sliding bearing includes a spherical outer peripheral surface in matching contact with the ball socket surface of the kit body.

7. The outer-rotor motor according to claim 6, wherein The sliding bearing further includes a circular inner peripheral surface in matching contact with an outer peripheral surface of the rotating shaft and having an oil release port, an oil storage cavity formed between the circular inner peripheral surface and the spherical outer peripheral surface and communicating with the oil release port, and a grease filled in the oil storage cavity.

8. The outer rotor motor according to claim 1, characterized in that, The sliding bearing further includes a circular inner peripheral surface in matching contact with an outer peripheral surface of the rotating shaft and having an oil release port, an oil storage cavity formed between the circular inner peripheral surface and the spherical outer peripheral surface and communicating with the oil release port, and a grease filled in the oil storage cavity.

9. The external rotor motor according to claim 8, wherein, The outer-rotor assembly includes a magnetic ring fixed to an end of the impeller of the cross-flow fan, the magnetic ring being sleeved outside a stator core of the inner-stator assembly and coaxial with the impeller.

10. The external rotor motor according to claim 1, characterized in that, The sliding bearing is made of a resin material or a metal material.

Images