Motor and air conditioner

Abstract

The utility model discloses a motor and an air conditioner. The motor comprises a housing, a first bearing, a stator assembly, a rotor assembly, a rotating shaft and a protective cover. The protective cover is fixedly connected to the rotating shaft and located at the end, away from the rotor assembly, of the first bearing, the protective cover is arranged around the rotating shaft and provided with an open end, and the open end faces the first bearing; wherein the shell comprises a waterproof part, the waterproof part is located at one end, close to the protective cover, of the shell and extends in the circumferential direction of the rotor assembly, and the open end of the protective cover is located in a space surrounded by the waterproof part. By arranging the waterproof part, the risk that water flows into the first bearing can be reduced, the waterproof capability of the motor is improved, grease of the first bearing is prevented from being polluted, the first bearing is prevented from being corroded, abnormal sound of the bearing is prevented, and the service life of the first bearing is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a motor and an air conditioner. Background Art

[0002] The bearing is a relatively weak component in the motor. If water seeps into the bearing, the bearing grease will be contaminated and the bearing will be corroded, which will greatly reduce the bearing life and even cause abnormal noise. For the motor of the air conditioner, especially the motor of the outdoor unit, its waterproof performance is particularly important. In the related art, the motor bearing is waterproofed by setting a bearing cover. However, when it rains heavily, the bearing cover still cannot prevent rainwater from entering the bearing from the open end of the bearing cover, and the waterproof performance is poor. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a motor with good waterproof performance, which effectively protects the bearing and prolongs the service life of the bearing.

[0004] The utility model also provides an air conditioner with the motor.

[0005] The motor according to the first embodiment of the utility model includes:

[0006] case;

[0007] A bearing assembly, fixedly mounted on the housing, the bearing assembly comprising a first bearing;

[0008] A stator assembly, fixedly connected to the housing;

[0009] A rotor assembly rotatably disposed in the inner hole of the stator assembly;

[0010] A rotating shaft, fixedly connected to the rotor assembly, the rotating shaft is connected to the first bearing and passes through the housing;

[0011] A protective cover, fixedly connected to the rotating shaft and located at an end of the first bearing away from the rotor assembly, the protective cover is arranged around the rotating shaft, the protective cover has an open end, and the open end faces the first bearing;

[0012] The shell includes a waterproof portion, which is located at one end of the shell close to the protective cover and extends along the circumference of the rotor assembly, and the open end of the protective cover is located in the space surrounded by the waterproof portion.

[0013] The motor according to the first embodiment of the utility model has at least the following beneficial effects: by providing a waterproof part and allowing the open end of the protective cover located outside the first bearing to extend into the space surrounded by the waterproof part, on the one hand, the waterproof part itself can block rainwater; on the other hand, the waterproof part can shield the open end of the protective cover to prevent rainwater from directly flowing into the first bearing from the open end of the protective cover, thereby extending the path of water flowing to the first bearing and increasing the resistance of water flowing to the first bearing. Therefore, the risk of water flowing into the first bearing can be reduced, the waterproof ability of the motor can be improved, the grease of the first bearing can be prevented from being contaminated and the first bearing can be prevented from being corroded, abnormal noise of the bearing can be prevented, and the service life of the first bearing can be extended.

[0014] According to some embodiments of the utility model, along the radial direction of the rotor assembly, the waterproof part has a first outer wall surface and a first inner wall surface that are opposite to each other, and the waterproof part is provided with a drain outlet, which is located at the lower end of the waterproof part and extends from the first outer wall surface to the first inner wall surface.

[0015] According to some embodiments of the present invention, the waterproof portion includes a root and a head located at two axial ends of the rotor assembly, and the drainage port extends from the head to the root.

[0016] According to some embodiments of the present invention, the drain port has a first wall surface and a second wall surface arranged opposite to each other along the circumferential direction, and the minimum distance between the first wall surface and the second wall surface is L. 1 The minimum inner diameter of the waterproof part is D, which satisfies: 0.25≤L 1 / D≤0.5.

[0017] According to some embodiments of the present invention, along the radial direction of the rotor assembly, the minimum gap between the waterproof portion and the protective cover is L 2 , meet: 2.5mm≤L 2 ≤3.5mm.

[0018] According to some embodiments of the present invention, the length of the protective cover extending into the space surrounded by the waterproof part is L 3 , satisfying: 15°≤arctan(L 2 / L 3 )≤23°.

[0019] According to some embodiments of the present utility model, the waterproof portion has a first outer wall surface on a side facing away from the rotating shaft, and along the protruding direction of the waterproof portion, the distance between the first outer wall surface and the rotation axis of the rotating shaft decreases.

[0020] According to some embodiments of the present invention, the first outer wall surface is a part of the revolving surface and has a first generatrix, the first generatrix is ​​a straight line, and the angle between the first generatrix and the rotation axis is θ, satisfying: 15°≤θ≤20°.

[0021] According to some embodiments of the present invention, the waterproof portion is integrally formed with the shell.

[0022] According to some embodiments of the present invention, the protective cover is disposed on the outer periphery of the first bearing.

[0023] According to some embodiments of the utility model, the protective cover has a second outer wall surface on a side facing away from the rotating shaft, and along the protruding direction of the waterproof portion, the distance between the second outer wall surface and the rotation axis of the rotating shaft decreases.

[0024] According to some embodiments of the present utility model, the protective cover includes a first water retaining portion, which is protruded from the second outer wall surface along the radial direction of the rotor assembly and is located at the open end, and the first water retaining portion extends along the circumferential direction.

[0025] According to some embodiments of the present utility model, the bearing assembly includes a bearing seat, the bearing seat is fixedly connected to the housing and forms a bearing cavity, and the first bearing is installed in the bearing cavity.

[0026] According to some embodiments of the utility model, in the axial direction of the rotor assembly, the bearing seat is provided with a flange portion at one end facing the protective cover, and the flange portion is bent in a direction away from the rotating shaft.

[0027] According to some embodiments of the present invention, the protective cover includes a second water retaining portion, which is disposed inside the protective cover and around the outside of the flange portion.

[0028] An air conditioner according to an embodiment of the second aspect of the utility model comprises the motor according to the embodiment of the first aspect of the utility model.

[0029] The air conditioner according to the second embodiment of the utility model has at least the following beneficial effects: by providing a waterproof part and allowing the open end of the protective cover located outside the first bearing to extend into the space surrounded by the waterproof part, on the one hand, the waterproof part itself can block rainwater, and on the other hand, the waterproof part can shield the open end of the protective cover to prevent rainwater from directly flowing into the first bearing from the gap between the open end and the housing, thereby extending the path of water flowing to the first bearing and increasing the resistance of water flowing to the first bearing. Therefore, the risk of water flowing into the first bearing can be reduced, the waterproof ability of the motor can be improved, the grease of the first bearing can be prevented from being contaminated and the first bearing can be prevented from being corroded, abnormal noise of the bearing can be prevented, and the service life of the first bearing can be extended.

[0030] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0032] Figure 1 It is a three-dimensional diagram of the motor in the embodiment of the utility model;

[0033] Figure 2 yes Figure 1 Sectional view at A in the middle;

[0034] Figure 3 yes Figure 2 The enlarged view of point B in the middle;

[0035] Figure 4 It is a schematic diagram of waterproofing of the waterproof part and the protective cover in the embodiment of the utility model.

[0036] Reference numerals:

[0037] Housing 100; waterproof part 110; first outer wall surface 111; first inner wall surface 112; drain port 113; first wall surface 1131; second wall surface 1132; root 114; head 115; second end surface 116; chamber 120; end cover 130; second bearing 140;

[0038] Bearing assembly 200; first bearing 210; bearing seat 220; flange portion 221;

[0039] Stator assembly 300;

[0040] Rotating shaft 400;

[0041] Protective cover 500 ; open end 510 ; first water retaining portion 511 ; third outer wall surface 5111 ; second inner wall surface 520 ; second outer wall surface 530 ; first end surface 540 ; second water retaining portion 550 . DETAILED DESCRIPTION

[0042] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0045] In the description of the present utility model, unless otherwise clearly defined, terms such as setting, installing, connecting, assembling, and matching should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present utility model based on the specific content of the technical solution.

[0046] Reference Figure 1 and Figure 2 As shown, the first embodiment of the utility model provides a motor, which is applied to a fan of an outdoor unit of an air conditioner. The motor includes a housing 100, a bearing assembly 200, a stator assembly 300, a rotor assembly, a horizontally arranged rotating shaft 400 and a protective cover 500.

[0047] Specifically, openings are set at both ends of the shell 100 along the horizontal direction, and the bearing assembly 200 is fixedly installed on the opening at one end of the shell 100. The bearing assembly 200 includes a first bearing 210 and a bearing seat 220. The bearing seat 220 is a circular thin-shell metal structure. The shell 100 is an injection molded part. The outer edge of the bearing seat 220 is fixedly connected to the opening at one end of the shell 100 by snap-fitting, nesting, rubber-coated injection molding, etc., which will not be repeated here.

[0048] A bearing cavity is recessed at the center of the bearing seat 220 in the direction of the chamber 120 facing away from the shell 100, and the first bearing 210 is installed in the bearing cavity. An end cover 130 is provided at the opening at one end of the shell 100 away from the bearing seat 220. The end cover 130 is sealed to the shell 100, and a second bearing 140 coaxial with the first bearing 210 is installed on the side of the end cover 130 facing the bearing seat 220.

[0049] By setting the bearing seat 220, on the one hand, the thin-shell bearing seat 220 can reduce processing costs and facilitate production and assembly; on the other hand, the bearing seat 220 can simplify the structure of the bearing assembly 200 and improve the assembly efficiency of the motor by setting a bearing cavity to install the first bearing 210.

[0050] Reference Figure 2 As shown, it can be understood that the stator assembly 300 is mainly composed of an electromagnetic coil (winding) and an iron core, which is fixedly connected to the inner wall of the chamber 120 of the housing 100, that is, the stator assembly 300 is located between the first bearing 210 and the second bearing 140, and the rotor assembly is rotatably arranged in an inner hole formed by the stator assembly 300. According to different motor types, the specific structure of the rotor assembly is also different. For example, the rotor of a DC motor is usually composed of a winding made of one or more conductors, the rotor of an AC asynchronous motor is usually composed of many conductor bars (squirrel cages), the rotor of a synchronous motor can be a permanent magnet or an electromagnet, and the rotor of a stepper motor is usually composed of multiple poles, which will not be repeated here.

[0051] Reference Figure 1 and Figure 2 As shown, it can be understood that the rotating shaft 400 is fixedly connected to the rotor assembly, the middle section of the rotating shaft 400 is connected to the first bearing 210, one end of the rotating shaft 400 is connected to the second bearing 140, and the other end passes through the shell 100 and is connected to the external wind wheel.

[0052] Reference Figure 2 and Figure 3 As shown, it can be understood that the protective cover 500 is fixedly connected to the rotating shaft 400 and is located at the end of the first bearing 210 away from the rotor assembly. The protective cover 500 is arranged around the rotating shaft 400. The protective cover 500 has an open end 510, and the open end 510 faces the first bearing 210. In other words, the protective cover 500 is opened at one end facing the first bearing 210, and the end of the protective cover 500 where the opening is set is the open end 510. Along the axial direction of the rotating shaft 400, the protective cover 500 and the housing 100 are spaced apart, that is, there is a gap between the end surface of the open end 510 and the end surface of the housing 100, so as to avoid the friction between the housing 100 and the open end 510 affecting the operation of the rotating shaft 400.

[0053] Since the bearing cavity is formed by the center of the bearing seat 220 being recessed toward the direction of the chamber 120 facing away from the housing 100, that is, the bearing seat 220 is protruded toward the open end 510, the protective cover 500 can be spaced apart from the bearing seat 220, that is, there is also a gap between the open end 510 and the bearing seat 220 protruding from the end surface of the housing 100, thereby preventing friction between the bearing seat 220 and the open end 510 from affecting the operation of the rotating shaft 400.

[0054] The protective cover 500 can also be arranged on the outer periphery of the bearing seat 220. In this case, the inner diameter of the opening of the open end 510 is larger than the outer diameter of the bearing seat 220, and the protruding part of the bearing seat 220 is accommodated in the protective cover 500, that is, the protective cover 500 covers part of the bearing seat 220 in the axial direction, or on the projection plane parallel to the rotation axis of the rotor assembly, the projection of the protective cover 500 and the projection of the bearing seat 220 have an overlapping area.

[0055] The protective cover 500 is arranged on the outer periphery of the bearing seat 220 to prevent rainwater from directly entering the first bearing 210 through the gap between the protective cover 500 and the bearing seat 220, thereby extending the flow path of rainwater, increasing rainwater resistance, and enhancing the water-isolating effect of the protective cover 500.

[0056] It should be noted that the protective cover 500 and components such as the waterproof part 110 described later, in addition to preventing outdoor rain, can also prevent condensation water or other corrosive liquids. This is specially explained here to avoid misunderstanding.

[0057] Reference Figure 3 As shown, it can be understood that, in the axial direction of the rotating shaft 400, the bearing seat 220 is provided with a flange portion 221 at one end facing the protective cover 500, and the flange portion 221 is arranged around the rotating shaft 400. The end of the flange portion 221 away from the shell 100 is bent in the direction away from the rotating shaft 400, that is, the flange portion 221 is in a trumpet shape with an opening that gradually increases in size in the direction away from the rotor assembly.

[0058] By providing a bent flange portion 221, when rainwater flows through the outer surface of the bearing seat 220 blocked by the protective cover 500, it needs to move obliquely "climbing" before flowing into the bearing, further extending the flow path of rainwater and increasing rainwater resistance.

[0059] Continue to refer to Figure 3 As shown, it can be understood that the protective cover 500 includes a second water retaining portion 550, which is an annular protrusion structure arranged inside the protective cover 500, and the second water retaining portion 550 is arranged around the outside of the flange portion 221, that is, the flange portion 221 partially penetrates into the second water retaining portion 550, that is, the second water retaining portion 550 covers part of the flange portion 221 in the axial direction, or on the projection plane parallel to the rotation axis, the projection of the second water retaining portion 550 and the projection of the flange portion 221 have an overlapping area.

[0060] By providing a second water retaining portion 550, which is arranged around the outer periphery of the flange portion 221, rainwater can be prevented from directly entering the bearing from the gap between the flange portion 221 and the inner end surface of the protective cover 500. In other words, the second water retaining portion 550 blocks part of the flange portion 221, which can have an effect similar to the protective cover 500 blocking part of the bearing seat 220, that is, extending the flow path of rainwater. Please refer to the previous description of the protective cover 500 for details, which will not be repeated here.

[0061] Reference Figure 1 As shown, it can be understood that the shell 100 includes a waterproof portion 110, which is located at one end of the shell 100 close to the protective cover 500 and extends along the circumference of the rotor assembly, and the open end 510 of the protective cover 500 is located in the space surrounded by the waterproof portion 110, that is, the waterproof portion 110 is a convex block structure formed on the end face of the shell 100 and arranged around the protective cover 500, that is, the waterproof portion 110 covers part of the protective cover 500 in the axial direction, or on the projection plane parallel to the rotation axis, the projection of the waterproof portion 110 and the projection of the protective cover 500 have an overlapping area.

[0062] In addition, in the radial direction of the rotor assembly, there is a gap between the waterproof part 110 and the protective cover 500, so as to avoid interference and friction between the waterproof part 110 and the protective cover 500 and affect the operation of the rotor assembly. The outer shape of the waterproof part 110 can be designed to be a ring or a polygon such as a rectangle or hexagon coaxial with the rotating shaft 400, or the outer contour of the cross section of the waterproof part 110 on the cross section perpendicular to the rotating axis is a polygon such as a rectangle or hexagon, which will not be repeated here.

[0063] The waterproof part 110 can be integrally formed with the shell 100, that is, the waterproof part 110 is directly integrally formed with the shell 100 during injection molding, so that there is no gap between the waterproof part 110 and the shell 100, thereby effectively improving the structural stability of the waterproof part 110, saving the time cost required for installing the waterproof part 110, and improving the assembly efficiency of the motor.

[0064] The waterproof part 110 can also be fixedly installed on the shell 100 by means of screw connection, clamping connection, gluing, etc. At this time, a sealing component such as a sealing ring can be arranged between the waterproof part 110 and the shell 100 to prevent rainwater from flowing into the bearing through the joint between the shell 100 and the waterproof part 110. By setting a split waterproof part 110, the mold design of the shell 100 and the maintenance and replacement of the waterproof part 110 can be facilitated.

[0065] Although the waterproof part 110 is provided to prevent rainwater, when the rainwater is heavy, some water still enters the space surrounded by the waterproof part 110 , so that the rainwater may penetrate into the bearing.

[0066] Reference Figure 1 and Figure 2 As shown, it can be understood that the waterproof portion 110 has a first outer wall surface 111 and a first inner wall surface 112 which are radially opposite to each other, and the waterproof portion 110 is provided with a drain port 113, which is located at the lower end of the waterproof portion 110 and extends from the first outer wall surface 111 to the first inner wall surface 112, that is, the drain port 113 radially penetrates the lower end side wall of the waterproof portion 110. Specifically, the drain port 113 can be a hole groove structure opened at the lower end of the waterproof portion 110, or can be directly formed at the lower end of the waterproof portion 110. At this time, the waterproof portion 110 is an arc-shaped structure with an opening facing downward or a polygonal structure with an opening at the lower end.

[0067] By setting a drain port 113 at the lower end of the waterproof part 110 , the waterproof part 110 can have a drainage function, quickly drain rainwater from the waterproof part 110 , avoid the accumulated water in the waterproof part 110 from seeping into the bearing, and enhance the waterproof performance of the waterproof part 110 .

[0068] Reference Figure 3 As shown, it can be understood that the waterproof part 110 includes a root 114 and a head 115 located at both ends along the axial direction of the rotor assembly, and the drain port 113 extends from the head 115 to the root 114, that is, along the axial direction of the rotor assembly, the length of the drain port 113 is equal to the protruding height of the waterproof part 110. At this time, the drain port 113 not only penetrates the waterproof part 110 in the radial direction, but also penetrates the waterproof part 110 in the axial direction to the end surface of the housing 100 where the waterproof part 110 is located.

[0069] The drain port 113 is set to extend from the head 115 to the root 114, which can expand the opening area of ​​the drain port 113, thereby increasing the drainage volume. At the same time, when the waterproof part 110 is injection-molded, plastic materials are saved and it is directly formed by injection molding without the need for subsequent drilling, which is convenient for processing and demoulding.

[0070] Reference Figure 1 As shown, it can be understood that when the waterproof part 110 is in an arc shape with the opening facing downward, the central angle of the arc-shaped waterproof part 110 is usually greater than 180°. At this time, the drain port 113 has a first wall surface 1131 and a second wall surface 1132 arranged opposite to each other along the circumferential direction, and the minimum distance between the first wall surface 1131 and the second wall surface 1132 is L 1 , L 1 It can approximately represent the opening width of the projection of the drain port 113 on the projection plane parallel to the rotation axis. The minimum inner diameter of the waterproof part 110 is D. Since the waterproof part 110 is arc-shaped, D can approximately represent the length of the projection of the first inner wall surface 112 of the waterproof part 110 on the horizontal plane. L 1 and D satisfies: 0.25≤L 1 / D≤0.5. The minimum inner diameter D of the waterproof part 110 is twice the minimum distance between the first inner wall surface 112 and the rotation axis, that is, on the projection plane perpendicular to the rotation axis, the minimum inner diameter D is the diameter of the circle where the projection of the first inner wall surface 112 is located.

[0071] The minimum distance L between the first wall 1131 and the second wall 1132 1 The minimum distance L between the first wall 1131 and the second wall 1132 is set to be at least 0.25 times the minimum inner diameter D of the waterproof part 110, which can avoid the problem of rainwater siltation and overflow caused by the untimely drainage of the waterproof part 110 when the rain is heavy, and improve the drainage efficiency of the drain outlet 113; the minimum distance L between the first wall 1131 and the second wall 1132 is set to be at least 0.25 times the minimum inner diameter D of the waterproof part 110, which can avoid the problem of rainwater siltation and overflow caused by the untimely drainage of the waterproof part 110 when the rain is heavy, and improve the drainage efficiency of the drain outlet 113; 1 It is set to be less than 0.5 times of the minimum inner diameter D of the waterproof part 110 to limit the maximum width of the drain port 113, thereby reducing the risk of water being pumped into the waterproof part 110 through the drain port 113 when the wind wheel is working, thereby further reducing the risk of rainwater flowing into the bearing.

[0072] By reasonably limiting the minimum distance L between the first wall 1131 and the second wall 1132 1 The size range of the drain port 113 is ensured to be able to quickly drain water, thereby reducing the risk of water being pumped into the waterproof part 110 through the drain port 113 when the wind wheel is working, and effectively improving the structural rationality of the drain port 113.

[0073] It should be noted that the first wall 1131 and the second wall 1132 may be two vertical planes perpendicular to the horizontal plane, so as to facilitate the mold design of the drain outlet 113. In this case, the minimum distance L between the first wall 1131 and the second wall 1132 is 1 is the distance between the first wall 1131 and the second wall 1132; the first wall 1131 and the second wall 1132 may also be two relatively inclined planes, that is, the drain outlet 113 is trumpet-shaped on the projection plane perpendicular to the rotation axis, thereby having a certain diversion effect on rainwater. At this time, the minimum distance L between the first wall 1131 and the second wall 1132 is 1 That is, it is the width of the small end of the trumpet-shaped drain port 113. The shapes of the first wall 1131 and the second wall 1132 are not specifically limited here, and the user can select a suitable wall structure according to actual needs, as long as it can ensure that rainwater can be drained quickly and stably.

[0074] Reference Figure 2As shown, it can be understood that the waterproof portion 110 has a first outer wall surface 111 on the side facing away from the rotating shaft 400, and along the protruding direction of the waterproof portion 110 (the protruding direction is parallel to the direction of the rotating axis), the distance between the first outer wall surface 111 and the rotating axis of the rotating shaft 400 decreases, that is, along the direction of the rotating axis of the rotating shaft 400, the farther away from the rotor assembly, the closer the first outer wall surface 111 is to the rotating shaft 400.

[0075] Specifically, the distance from the first outer wall 111 to the rotation axis can be set to decrease at a uniform speed. At this time, the shape of the first outer wall 111 on the longitudinal section passing through the rotation axis is an oblique line; the distance from the first outer wall 111 to the rotation axis can also be set to decrease at an accelerated speed. At this time, the shape of the first outer wall 111 on the longitudinal section passing through the rotation axis is an arc convex outward (i.e., a curve with an increasing slope); the distance from the first outer wall 111 to the rotation axis can also be set to decrease at a decelerated speed. At this time, the shape of the first outer wall 111 on the longitudinal section passing through the rotation axis is an arc concave inward (i.e., a curve with a decreasing slope).

[0076] By setting the first outer wall surface 111 with a decreasing distance from the rotation axis of the rotating shaft 400, when rainwater falls on the first outer wall surface 111, the first outer wall surface 111 can play a diversion effect, guiding the water to flow down quickly, avoiding rainwater accumulation and corrosion of the waterproof part 110, and extending the service life of the waterproof part 110.

[0077] Reference Figure 3 As shown, it can be understood that the first outer wall surface 111 is a part of the revolution surface and has a first generatrix, the first generatrix is ​​a straight line, that is, the distance from the first outer wall surface 111 to the rotation axis decreases at a uniform speed, and the first outer wall surface 111 is a part of the conical surface. At this time, the shape of the first generatrix on the longitudinal section passing through the rotation axis is an oblique line, and the angle between the first generatrix and the rotation axis is θ, which satisfies: 15°≤θ≤20°.

[0078] The angle between the first busbar and the rotation axis is set to be greater than 15° to avoid problems such as the tapered first outer wall 111 having a too small angle, which may lead to poor diversion effect and corrosion of the waterproof part 110 due to rainwater accumulation; the angle between the first busbar and the rotation axis is set to be less than 20° to avoid problems such as the tapered first outer wall 111 having a too large angle, which may lead to material waste due to the radial width of the root 114 of the waterproof part 110 being too large, or problems such as the tapered first outer wall 111 having a too large angle, which may lead to the head 115 of the waterproof part 110 having a too small radial width and poor structural strength of the waterproof part 110, difficulty in injection molding, and difficulty in processing.

[0079] By reasonably limiting the angle range between the first generatrix and the rotation axis, structural problems of the first outer wall 111 can be avoided while ensuring that the first outer wall 111 can play a sufficient guiding role, thereby effectively improving the structural rationality of the waterproof part 110.

[0080] Continue to refer to Figure 3 As shown, it can be understood that the protective cover 500 has a second outer wall surface 530 on the side facing away from the rotating shaft 400, and along the protruding direction of the waterproof portion 110, the distance between the second outer wall surface 530 and the rotation axis of the rotating shaft 400 decreases, that is, along the direction of the rotation axis of the rotating shaft 400, the farther away from the rotor assembly, the closer the second outer wall surface 530 is to the rotating shaft 400.

[0081] Specifically, the second outer wall surface 530 is a revolution surface and has a second generatrix. The second generatrix can be an oblique line, in which case the second outer wall surface 530 has a conical shape. The second generatrix can also be an arc line, in which case the second outer wall surface 530 has a revolution arc surface that is convex outward or concave inward. The structure of the second outer wall surface 530 can refer to the structure of the first outer wall surface 111 described above, and will not be repeated here.

[0082] By setting an inclined second outer wall 530, when rainwater falls on the second outer wall 530, the second outer wall 530 can also play a diversion effect, guiding the water to flow down quickly, avoiding rainwater accumulation and corrosion of the protective cover 500, and extending the service life of the protective cover 500. In addition, since the waterproof part 110 covers part of the protective cover 500 in the axial direction, that is, along the protruding direction of the waterproof part 110, the protective cover 500 partially protrudes from the end face of the waterproof part 110. At this time, the first outer wall 111 can guide part of the rainwater to fall on the second outer wall 530, and the second outer wall 530 then guides the rainwater to flow down, further improving the diversion efficiency of the waterproof part 110.

[0083] The protective cover 500 has a second inner wall surface 520 on the side facing the rotating shaft 400. Along the protruding direction of the waterproof part 110, the distance between the second inner wall surface 520 and the rotation axis of the rotating shaft 400 decreases, so that the opening of the open end 510 is in a trumpet shape that expands toward the bearing seat 220 to avoid the bearing seat 220. Along the protruding direction of the waterproof part 110, since the distances between the second outer wall surface 530 and the second inner wall surface 520 and the rotation axis of the rotating shaft 400 decrease, the wall thickness of the open end 510 in the radial direction is small, resulting in a relatively fragile structure of the protective cover 500 at the open end 510.

[0084] Reference Figure 2 and Figure 3As shown, it can be understood that the protective cover 500 includes an annular first water retaining portion 511, which is radially protruded from the second outer wall surface 530 and located at the open end 510, and the first water retaining portion 511 extends circumferentially, that is, the first water retaining portion 511 is an annular step structure formed on the outer periphery of the open end 510.

[0085] By providing an annular first water retaining portion 511 at the open end 510, on the one hand, the first water retaining portion 511 can fill part of the gap between the outer edge of the protective cover 500 and the inner wall of the waterproof portion 110, thereby playing a water retaining role; on the other hand, the first water retaining portion 511 can increase the radial wall thickness of the open end 510, thereby improving the structural strength of the protective cover 500 at the open end 510.

[0086] Reference Figure 4 As shown, it can be understood that along the radial direction of the rotating shaft 400, the minimum gap between the waterproof part 110 and the protective cover 500 is L 2 When the protective cover 500 is provided with the first water retaining portion 511, the first water retaining portion 511 has a third outer wall surface 5111 on the side facing away from the rotating shaft 400. Under the premise that the protective cover 500 is provided with the first water retaining portion 511 and the distance between the second outer wall surface 530 and the rotation axis of the rotating shaft 400 decreases, the minimum gap L between the waterproof portion 110 and the protective cover 500 is 2 That is, the distance between the third outer wall 5111 and the first inner wall 112, L 2 Meet: 2.5mm≤L 2 ≤3.5mm.

[0087] The minimum gap L between the waterproof part 110 and the protective cover 500 is 2 The minimum clearance L between the waterproof part 110 and the protective cover 500 is set to be above 2.5 mm to avoid the problem that when the protective cover 500 rotates with the rotating shaft 400, the clearance between the waterproof part 110 and the protective cover 500 is too small, which may cause friction and wear between the waterproof part 110 and the protective cover 500 and affect the rotation of the rotating shaft 400, thereby improving the working stability of the motor; the minimum clearance L between the waterproof part 110 and the protective cover 500 is set to be above 2.5 mm to avoid the problem that when the protective cover 500 rotates with the rotating shaft 400, the clearance between the waterproof part 110 and the protective cover 500 is too small to cause friction and wear between the waterproof part 110 and the protective cover 500 and affect the rotation of the rotating shaft 400, thereby improving the working stability of the motor; 2 It is set below 3.5 mm to avoid the gap between the waterproof part 110 and the protective cover 500 being too large, which would cause rainwater to easily enter the waterproof part 110 and result in poor waterproof effect, thereby improving the waterproof efficiency of the motor.

[0088] By reasonably limiting the minimum gap between the waterproof part 110 and the protective cover 500 , both the normal operation of the motor and the waterproof effect of the waterproof part 110 can be ensured.

[0089] It should be added that when the protective cover 500 is not provided with the first water retaining portion 511, that is, when the protective cover 500 is in a conical shape or a rotating arc surface, the minimum gap L between the waterproof portion 110 and the protective cover 500 is 2That is, the distance between the outer peripheral wall of the protective cover 500 at the maximum outer diameter and the first inner wall surface 112; when the second outer wall surface 530 is a cylindrical surface, the distance between the second outer wall surface 530 and the center line of the rotating shaft 400 remains unchanged, and the minimum gap L between the waterproof part 110 and the protective cover 500 is 2 That is, the distance between the second outer wall 530 and the first inner wall 112. In short, no matter what the shape of the protective cover 500 is, the minimum gap L between the waterproof part 110 and the protective cover 500 is 2 Always meet: 2.5mm≤L 2 ≤3.5mm to ensure the waterproof effect of the waterproof part 110. Special explanation is given here to avoid misunderstanding.

[0090] Continue to refer to Figure 4 As shown, it can be understood that, along the axial direction of the rotor assembly, the length of the protective cover 500 extending into the space surrounded by the waterproof part 110 is L 3 Specifically, along the axial direction of the rotor assembly, the side of the protective cover 500 facing the rotor assembly has a first end surface 540, the side of the waterproof part 110 facing away from the rotor assembly has a second end surface 116, and the length L of the protective cover 500 extending into the space surrounded by the waterproof part 110 is 3 That is, the distance between the first end surface 540 and the second end surface 116 in the axial direction of the rotor assembly. 3 and L 2 Satisfy: 15°≤arctan(L 2 / L 3 )≤23°.

[0091] In the longitudinal section through the rotation axis, the line connecting the inner end of the second end surface 116 of the waterproof part 110 and the outer end of the first end surface 540 of the first water retaining part 511 is an oblique line, and there is an angle φ between the oblique line and the rotation axis. Obviously, φ=arctan(L 2 / L 3 ). In order for inclined rainwater to directly enter the gap between the housing 100 and the first end surface 540 without colliding with the second end surface 116 of the waterproof part 110 or the first water retaining part 511, the angle between the inclined rainwater and the horizontal plane needs to be less than φ. The side close to the rotating shaft 400 is defined as the inner side, and the side away from the rotating shaft 400 is defined as the outer side.

[0092] Since the minimum inclination angle of rainwater (i.e. the minimum value of the angle between the inclined rainwater and the horizontal plane) is 23°, the angle φ is set below 23°, thereby reducing the possibility of rainwater entering the waterproof part 110 and effectively improving the waterproof efficiency of the motor; setting the angle φ above 15° can prevent the waterproof part 110 from protruding too much in the axial direction and exceeding the first end face 540 of the protective cover 500, thereby affecting the bearing and motor heat dissipation.

[0093] By making 15°≤arctan(L 2 / L 3 )≤23°, ensuring the motor is waterproof without affecting the heat dissipation of the bearing and the motor.

[0094] It should be added that, due to the decreasing distance between the first outer wall surface 111 and the rotation axis of the rotating shaft 400 along the protruding direction of the waterproof part 110, when the decreasing amplitude of the first outer wall surface 111 is large, the distance between the first outer wall surface 111 and the first inner wall surface 112 at the end away from the rotor assembly is small, that is, the radial thickness of the end of the waterproof part 110 away from the rotor assembly is small, that is, the outer contour of the end of the waterproof part 110 away from the rotor assembly on the longitudinal section passing through the rotation axis is close to a tip. At this time, the length L of the protective cover 500 extending into the space surrounded by the waterproof part 110 is 3 That is, it is the distance from the first end surface 540 to the tip end point of the waterproof portion 110 .

[0095] Similarly, when the opening of the open end 510 is larger, the outer contour of the wall at the open end 510 in the longitudinal section passing through the rotation axis is also close to a tip. At this time, the length L of the protective cover 500 extending into the space surrounded by the waterproof part 110 is 3 That is, the distance from the tip end of the open end 510 to the second end surface 116 (or the tip end of the waterproof part 110). In short, no matter what the shape of the protective cover 500 and the waterproof part 110 is, the length L of the protective cover 500 extending into the space surrounded by the waterproof part 110 is 3 Always meet: 15°≤arctan(L 2 / L 3 )≤23°, to avoid arctan(L 2 / L 3 ) is greater than 23°, rainwater is more likely to pass through the gap between the waterproof portion 110 and the protective cover 500 and affect the waterproof effect of the waterproof portion 110; or avoid arctan (L 2 / L 3 ) is less than 15°, the height of the waterproof portion 110 along the axial direction is too high and affects the heat dissipation of the bearing and the motor. This is specially explained here to avoid misunderstanding.

[0096] Reference Figure 3 and Figure 4 As shown, it can be understood that by providing the waterproof portion 110 and making the open end 510 of the protective cover 500 located on the outside of the first bearing 210 extend into the space surrounded by the waterproof portion 110, at this time, the waterproof portion 110 blocks part of the protective cover 500, cooperates with the protective cover 500 to block part of the bearing seat 220, and the second water retaining portion 550 blocks part of the flange portion 221 of the bearing seat 220, so that a tortuous waterproof maze structure is formed between the waterproof portion 110, the protective cover 500 and the bearing seat 220.

[0097] If rainwater wants to enter the first bearing 210, it needs to flow through the gap between the first inner wall 112 and the second outer wall 530, the gap between the shell 100 and the first end face 540, the gap between the bearing seat 220 and the second inner wall 520, the gap between the bearing seat 220 and the second water retaining part 550, and the gap between the second water retaining part 550 and the flange part 221 in sequence before it can finally enter the bearing and corrode the bearing grease.

[0098] The waterproof part 110 cooperates with the protective cover 500. On the one hand, the waterproof part 110 itself can block rainwater and prevent water from directly flowing into the first bearing 210; on the other hand, the waterproof part 110 can shield the open end 510 of the protective cover 500 and form a labyrinth structure to prevent rainwater from directly flowing into the first bearing 210 from the open end 510 of the protective cover 500, thereby extending the path of water flowing to the first bearing 210 and increasing the resistance of water flowing to the first bearing 210. Therefore, the risk of water flowing into the first bearing 210 can be greatly reduced, the waterproof ability of the motor can be improved, the grease of the first bearing 210 can be prevented from being contaminated and corroded, the bearing abnormal noise can be prevented, and the service life of the first bearing 210 can be extended.

[0099] The air conditioner according to the second embodiment of the utility model comprises the motor according to the first embodiment of the utility model.

[0100] Since the air conditioner adopts all the technical solutions of the motor of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment.

[0101] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A motor, characterized in that include: case; A bearing assembly, fixedly mounted on the housing, the bearing assembly comprising a first bearing; A stator assembly, fixedly connected to the housing; A rotor assembly rotatably disposed in the inner hole of the stator assembly; A rotating shaft, fixedly connected to the rotor assembly, the rotating shaft is connected to the first bearing and passes through the housing; A protective cover, fixedly connected to the rotating shaft and located at an end of the first bearing away from the rotor assembly, the protective cover is arranged around the rotating shaft, the protective cover has an open end, and the open end faces the first bearing; The shell includes a waterproof portion, which is located at one end of the shell close to the protective cover and extends along the circumference of the rotor assembly, and the open end of the protective cover is located in the space surrounded by the waterproof portion.

2. The motor according to claim 1, characterized in that: Along the radial direction of the rotor assembly, the waterproof part has a first outer wall surface and a first inner wall surface that are opposite to each other. The waterproof part is provided with a drainage port, which is located at the lower end of the waterproof part and extends from the first outer wall surface to the first inner wall surface.

3. The motor according to claim 2, characterized in that: The waterproof part includes a root part and a head part located at two ends of the rotor assembly in the axial direction, and the drainage port extends from the head part to the root part.

4. The motor according to claim 3, characterized in that: The drain port has a first wall surface and a second wall surface that are arranged opposite to each other along the circumferential direction, a minimum distance between the first wall surface and the second wall surface is L1, a minimum inner diameter of the waterproof portion is D, and the following condition is satisfied: 0.25≤L1 / D≤0.

5.

5. The motor according to claim 1, characterized in that: Along the radial direction of the rotor assembly, the minimum gap between the waterproof portion and the protective cover is L2, which satisfies: 2.5mm≤L2≤3.5mm.

6. The motor according to claim 5, characterized in that: Along the axial direction of the rotor assembly, the length of the protective cover extending into the space surrounded by the waterproof portion is L3, which satisfies: 15°≤arctan(L2 / L3)≤23°.

7. The motor according to claim 1, characterized in that: The waterproof part has a first outer wall surface on one side facing away from the rotating shaft, and along the protruding direction of the waterproof part, the distance between the first outer wall surface and the rotation axis of the rotating shaft decreases gradually.

8. The motor according to claim 7, characterized in that: The first outer wall surface is a part of the revolution surface and has a first generatrix, the first generatrix is ​​a straight line, and the angle between the first generatrix and the rotation axis is θ, which satisfies: 15°≤θ≤20°.

9. The motor according to claim 1, characterized in that: The waterproof part is integrally formed with the shell.

10. The motor according to claim 1, characterized in that: The protective cover is arranged on the outer periphery of the first bearing.

11. The motor according to claim 1 or 10, characterized in that: The protective cover has a second outer wall surface on a side facing away from the rotating shaft, and along the protruding direction of the waterproof portion, the distance between the second outer wall surface and the rotation axis of the rotating shaft decreases gradually.

12. The motor according to claim 11, characterized in that: The protective cover comprises a first water retaining portion, which is protruded on the second outer wall surface along the radial direction of the rotor assembly and is located at the open end, and the first water retaining portion extends along the circumferential direction.

13. The motor according to claim 1, characterized in that: The bearing assembly comprises a bearing seat, the bearing seat is fixedly connected to the housing and forms a bearing cavity, and the first bearing is installed in the bearing cavity.

14. The motor according to claim 13, characterized in that: In the axial direction of the rotor assembly, one end of the bearing seat facing the protective cover is provided with a flange portion, and the flange portion is bent in a direction away from the rotating shaft.

15. The motor according to claim 14, characterized in that: The protective cover comprises a second water retaining portion, which is arranged inside the protective cover and around the outer side of the flange portion.

16. An air conditioner, characterized in that Comprising a motor as claimed in any one of claims 1 to 15.

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