Motor end cover, motor and air conditioner

Abstract

The invention provides a motor end cover, a motor and an air conditioner, the motor end cover comprises an end cover body, the first side end face of the end cover body is provided with a conductive column extending along the axial direction of the end cover body, the end cover body is made of a conductive material, and the first side end face is also provided with a bearing chamber for assembling a bearing. And when the motor end cover is assembled at the end part of the motor, the conductive columns can be in contact with a stator iron core in the motor to form electric connection. The electric corrosion phenomenon of the motor can be prevented without arranging a conductive adhesive tape on the outer side of the motor in the prior art, the conductive columns can be electrically connected with the stator iron core after the motor end cover is assembled, independent assembly is not needed, and the motor end cover is very simple and convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of motor design, and in particular relates to a motor end cover, a motor and an air conditioner. Background Art

[0002] The anti-corrosion structure of traditional brushless DC motors usually uses conductive tape (see Figure 7 The conductive tape is attached to the motor end caps at the front and rear ends of the motor to form a closed loop to prevent damage from electrical corrosion (especially electrical corrosion of the bearings). During motor production and use, the conductive tape is easy to fall off the motor end caps, thereby causing the motor to lose its anti-electrical corrosion ability. In addition, the use of conductive tape to achieve a closed loop of shaft current on the outside of the motor is inconvenient to assemble and reduces the production efficiency of motor assembly. Summary of the invention

[0003] Therefore, the present invention provides a motor end cover, a motor, and an air conditioner, which can solve the technical problems that the method of using conductive tape on the outside of the motor to realize a closed loop of shaft current in the prior art is inconvenient to assemble, reduces the motor assembly production efficiency, and is easy to fall off and lose the anti-electrical corrosion ability during the production and use of the motor.

[0004] In order to solve the above problems, the present invention provides a motor end cover, including an end cover body, a first side end face of the end cover body is provided with a conductive column extending along its axial direction, the end cover body is made of conductive material, and a bearing chamber for assembling bearings is also formed on the first side end face, when the motor end cover is assembled to the end of the motor, the conductive column can contact the stator core in the motor to form an electrical connection.

[0005] In some embodiments, the conductive column is integrally formed with the end cap body.

[0006] In some embodiments, a pressing boss is further provided on the first side end surface, and the pressing boss is used to press the outlet sealing sleeve of the motor.

[0007] In some embodiments, the conductive pillar is located on a pressing surface of the pressing boss.

[0008] In some embodiments, the conductive posts include two, the two conductive posts are spaced apart, and the outlet hole of the outlet sealing sleeve is located in the space between the two conductive posts.

[0009] The present invention also provides a motor, comprising a stator assembly and a first end cover connected to the first end of the stator assembly, the first end cover being the above-mentioned motor end cover, a cable lead-out groove being formed at the first end of the stator assembly, a wire lead-out sealing sleeve being arranged in the cable lead-out groove, the wire lead-out sealing sleeve having positioning through holes penetrating through both ends thereof along the axial direction of the stator assembly, the conductive column passing through the positioning through hole and being electrically connected to the end face of the stator core in the stator assembly facing the first end.

[0010] In some embodiments, a first electrical connection hole is formed on an end surface of the stator core facing the first end, and the free end of the conductive column is inserted into the first electrical connection hole.

[0011] In some embodiments, the outlet sealing sleeve is made of rubber.

[0012] In some embodiments, the wire outlet hole of the wire outlet sealing sleeve passes through the inner and outer sides of the stator assembly, and when the motor end cover includes a holding boss, the wire outlet sealing sleeve has a sealing mating surface that cooperates with the holding boss, and a wire entry seam is provided on the sealing mating surface, and the wire entry seam is connected to the wire outlet hole.

[0013] In some embodiments, the cable lead-out groove and the holding boss are interference fit; and / or the cross-section of the cable entry seam is Y-shaped.

[0014] In some embodiments, the motor further includes a second end cover, the second end cover is connected to the second end of the stator assembly, and the second end cover is the motor end cover described above.

[0015] The present invention also provides an air conditioner, comprising the above-mentioned motor.

[0016] The motor end cover, motor and air conditioner provided by the present invention have the following beneficial effects:

[0017] By arranging a conductive column extending along the axial direction on the first side end surface of the end cover body, the conductive column can contact the stator core in the motor to form an electrical connection when the motor end cover is assembled on the motor, so that the occurrence of motor electrical corrosion can be prevented without arranging a conductive tape on the outside of the motor as in the prior art. The conductive column can realize electrical connection with the stator core after the motor end cover is assembled, and no separate assembly is required, which is very simple and convenient. The conductive column is used to realize electrical connection with the stator core, and the conductive performance of the conductive column is better than that of the conductive tape in the prior art, so it has a higher anti-electrical corrosion ability, and the corresponding motor has a longer life.

[0018] The conductive column is arranged on the pressing boss, so that the conductive column can achieve electrical contact with the stator core to ensure the purpose of preventing electrical corrosion, and at the same time, the conductive column can be used to position and limit the outlet sealing sleeve through which it passes, thereby preventing the position of the outlet sealing sleeve from shifting during the assembly process of the motor end cover and the motor, thereby ensuring the sealing effect of the outlet sealing sleeve;

[0019] The outlet sealing sleeve is made of rubber. When the first end cover is assembled, when the pressing boss on the first end cover applies pressure to the outlet sealing sleeve, the outlet sealing sleeve can have a large free deformation amount, and will not be cracked and damaged by stress like the relatively hard structure such as nylon in the prior art, or even damage the cables passing through it, and the fitting effect between the first end cover and the end surface of the stator assembly can be ensured;

[0020] By setting a wire entry seam on the sealing mating surface, when passing the cables, each cable can be pressed into each wire outlet hole through each wire entry seam, without the need to adopt the traditional method of inserting from one end of the wire outlet hole and leading out from the other end. In this way, the aperture of each wire outlet hole does not need to consider the size of the wiring terminal on the outer end of each cable, but only needs to consider the wire body diameter of the cable. The wire outlet hole is more closely in contact with the wire body, and the sealing effect is better.

[0021] The cross section of the wire entry seam is Y-shaped, and the upper opening of the Y-shape is a flared interface, which can facilitate the wire body of each cable to be guided into the corresponding wire outlet hole more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0023] Figure 1 is a schematic diagram of the three-dimensional structure of a motor end cover according to an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of the motor end cover in another perspective;

[0025] Figure 3 is a three-dimensional structural schematic diagram (appearance) of a motor according to an embodiment of the present invention;

[0026] Figure 4 yes Figure 3 A schematic diagram of the three-dimensional structure of the stator assembly;

[0027] Figure 5 yes Figure 3A schematic diagram of the three-dimensional structure of the stator core in the stator assembly;

[0028] Figure 6 Schematic diagram of the internal structure of the motor according to the embodiment of the present invention (without the rotor assembly);

[0029] Figure 7 The present invention is a schematic diagram of a structure in which a motor in the prior art adopts a conductive tape to prevent electrical corrosion.

[0030] The accompanying drawings are marked as follows:

[0031] 1. End cover body;

[0032] 11. Conductive column; 12. Bearing chamber; 13. Pressing boss; 14. Limit buckle point;

[0033] 2. Outlet sealing sleeve;

[0034] 21. Wire outlet hole; 22. Positioning through hole; 23. Wire entry seam;

[0035] 100, stator assembly; 101, cable lead-out slot; 102, stator core; 1021, first electrical connection hole; 1022, second electrical connection hole; 200, first end cover; 300, second end cover; 400, cable. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0038] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90° or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0039] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0040] See also Figure 1 and Figure 6 As shown, according to an embodiment of the present invention, a motor end cover is provided, including an end cover body 1, a first side end surface of the end cover body 1 is provided with a conductive column 11 extending along its axial direction, when the motor end cover is assembled in the motor, the first side end surface is also the inner side end surface of the end cover body 1, the end cover body 1 is made of conductive material (for example, metal materials such as cold-rolled steel and aluminum alloy), and a bearing chamber 12 for assembling a bearing (not shown in the figure, not labeled) is also formed on the first side end surface, when the motor end cover is assembled at the end of the motor, the conductive column 1 1 can be in contact with the stator core 102 in the motor to form an electrical connection, and it can be understood that when the motor end cover is assembled at the end of the motor, the bearing (metallic) in the bearing chamber 12 will be electrically connected to the stator core 102 via the end cover body 1 and the conductive column 11, and then under the electrical conduction of the motor end cover on the other side of the motor, the shaft current is realized along the rotating shaft in the motor - one side bearing - one side motor end cover and conductive column 11 - stator core 102 - the other side motor end cover conductive column 11 and motor end cover - the other side bearing - the rotating shaft electrical circuit closed loop.

[0041] In this technical solution, a conductive column 11 extending axially is provided on the first side end face of the end cover body 1. When the motor end cover is assembled on the motor, the conductive column 11 can contact the stator core 102 in the motor to form an electrical connection, thereby preventing the occurrence of electrical corrosion of the motor without providing a conductive tape (or copper rod) on the outside of the motor as in the prior art. The conductive column 11 can achieve electrical connection with the stator core 102 after the motor end cover is assembled, without the need for separate assembly, which is very simple and convenient.

[0042] In addition, it should be particularly emphasized that the present invention uses a conductive column 11 to achieve electrical connection with the stator core 102. The conductive performance of the conductive column 11 is better than that of the conductive tape in the prior art, so it has a higher anti-electrical corrosion ability and a corresponding longer motor life.

[0043] In a preferred embodiment, the conductive column 11 and the end cover body 1 are integrally formed, for example, by injection molding or machining. In this case, the materials of the two are the same, which can simplify the number of assembly parts and thus improve assembly efficiency.

[0044] In a preferred embodiment, a pressing boss 13 is further provided on the first side end face, and the pressing boss 13 is used to press the outlet sealing sleeve 2 of the motor. The sealing mating surface of the outlet sealing sleeve 2 of the motor can be pressed by the pressing boss 13, thereby ensuring the sealing of the mating position of the two while ensuring the stable and reliable position of the outlet sealing sleeve 2, thereby improving the protection level of the motor.

[0045] In a preferred embodiment, the conductive pillar 11 is located on the pressing surface of the pressing boss 13 , that is, the conductive pillar 11 is disposed on the pressing surface of the pressing boss 13 .

[0046] In this technical solution, the conductive column 11 is arranged on the holding boss 13, so that the conductive column 11 can achieve electrical contact with the stator core 102 to ensure the purpose of preventing electrical corrosion. At the same time, the conductive column 11 can also be used to position and limit the outlet sealing sleeve 2 passing through it, thereby preventing the position of the outlet sealing sleeve 2 from shifting during the assembly process of the motor end cover and the motor, thereby ensuring the sealing effect of the outlet sealing sleeve 2.

[0047] In a specific embodiment, the conductive posts 11 include two, the two conductive posts 11 are spaced apart, and the outlet hole 21 of the outlet sealing sleeve 2 is located in the space between the two conductive posts 11 .

[0048] In this technical solution, two conductive columns 11 are arranged at intervals, which can form positioning limits for both ends of the outlet sealing sleeve 2. This is especially suitable for the case where the outlet sealing sleeve 2 is longer, and can further prevent the position change caused by the pressure on the outlet sealing sleeve 2 during the assembly of the motor end cover.

[0049] According to an embodiment of the present invention, in combination with Figures 3 to 6 As shown, a motor is also provided, specifically, for example, a brushless DC motor, including a stator assembly 100 and a first end cover 200 (generally a non-shaft end, also referred to as a rear end cover) connected to a first end of the stator assembly 100, wherein the first end cover 200 is the above-mentioned motor end cover, and a cable lead-out groove 101 is formed at the first end of the stator assembly 100, wherein a cable lead-out groove 101 is provided with a cable lead-out sealing sleeve 2, that is, the cable lead-out sealing sleeve 2 is arranged in the cable lead-out groove 101, and the purpose of the arrangement is to protect the cable 400 led out of the motor while sealing the cable lead-out groove 101, so as to improve the protection level of the motor, that is, to prevent external water, dust, etc. from entering the interior of the motor through the cable lead-out groove 101, for details, see Figure 4 As shown, the outlet sealing sleeve 2 has a positioning through hole 22 that passes through both ends of the stator assembly 100 along the axial direction, and the conductive column 11 passes through the positioning through hole 22 to be electrically connected to the end surface of the stator core 102 in the stator assembly 100 facing the first end. It can be understood that due to the cooperation between the conductive column 11 and the aforementioned positioning through hole 22, the position change of the outlet sealing sleeve 2 can be effectively prevented when the first end cover 200 is assembled with the first end of the stator assembly 100. As shown above, when there are two conductive columns 11, there are also two aforementioned positioning through holes 22, and each conductive column 11 passes through a positioning through hole 22 respectively.

[0050] In a preferred embodiment, a first electrical connection hole 1021 is formed on the end face of the stator core 102 facing the first end, and the free end of the conductive column 11 is inserted into the first electrical connection hole 1021. By inserting and fitting the free end of the conductive column 11 with the first electrical connection hole 1021, a reliable electrical connection between the two can be achieved while also positioning the position of the first end cover 200.

[0051] Specifically, the free end of the aforementioned conductive column 11 can be plugged into the first electrical connection hole 1021 with an interference fit. When this method is used, the length of the conductive column 11 should not be too large to ensure that the axial fit between the first end cover 200 and the stator assembly 100 is tight and reliable; in another feasible embodiment, the conductive column 11 is designed as a cantilever beam structure that can be bent, and the corresponding aperture of the first electrical connection hole 1021 is larger than the diameter of the conductive column 11, and the two are plugged into a clearance fit. In this way, the length of the conductive column 11 can be slightly longer. During the process of assembling the first end cover 200 to the first end of the stator assembly 100, the free end of the conductive column 11 contacts the bottom wall of the first electrical connection hole 1021 and undergoes a certain degree of elastic deformation, and the gap of the aforementioned clearance fit can allow this elastic deformation, thereby ensuring a reliable electrical connection between the two and facilitating the assembly of the first end cover 200.

[0052] In some embodiments, the material of the outlet sealing sleeve 2 is rubber, which can be formed by injection molding. Specifically, the outlet sealing sleeve 2 can be injection molded with the stator assembly 100 as the injection molding base. This method can ensure the tightness of the connection between the two. It can also be separately injection molded and then assembled in the cable lead-out groove 101.

[0053] In this technical solution, a rubber-textured outlet sealing sleeve 2 is used. When the first end cover 200 is assembled, when the holding boss 13 on the first end cover 200 applies pressure to the outlet sealing sleeve 2, the outlet sealing sleeve 2 can have a large amount of free deformation, forming a flexible contact protection for the cable 400 therein, and will not be cracked and damaged by stress like relatively hard structures such as nylon in the prior art, or even damage the cable 400 passing through it, and can also ensure the fitting effect between the first end cover 200 and the end face of the stator assembly 100. It is also worth mentioning that since the possibility of damage to the cable 400, the outlet sealing sleeve 2 and other related components is reduced, the material cost and production time can be reduced. The rubber-textured outlet sealing sleeve 2 can also form a closer contact with the wire body of the cable 400, which can significantly improve its ability to prevent the axial movement of the cable 400.

[0054] As a preferred embodiment, the wire outlet hole 21 of the wire outlet sealing sleeve 2 passes through the inner and outer sides of the stator assembly 100, and when the motor end cover includes a holding boss 13, the wire outlet sealing sleeve 2 has a sealing mating surface (not marked in the figure) that cooperates with the holding boss 13, and a wire entry seam 23 is provided on the sealing mating surface, and the wire entry seam 23 is connected to the wire outlet hole 21. It can be understood that when there are multiple wire outlet holes 21, multiple wire entry seams 23 are also correspondingly provided to correspond to each wire outlet hole 21.

[0055] In this technical solution, by setting a wire entry seam 23 on the sealing mating surface, when the cable 400 passes through, each cable 400 can be pressed into each wire outlet hole 21 through each wire entry seam 23, without the need to adopt the traditional method of inserting from one end of the wire outlet hole 21 and leading out from the other end. In this way, the aperture of each wire outlet hole 21 does not need to consider the size of the terminal on the outer end of each cable 400, but only needs to consider the wire body diameter of the cable 400. The wire outlet hole 21 is more closely in contact with the wire body, and the sealing effect is better. At the same time, it is worth emphasizing that since the wire outlet sealing sleeve 2 is made of rubber material, it has a high deformation capacity, and the diameter of the wire outlet hole 21 can also be designed to be relatively small.

[0056] In a specific embodiment, the cross-section of the wire entry seam 23 is Y-shaped, and the upper opening of the Y-shape is a flared interface, which can facilitate the wire body of each cable 400 to be guided into the corresponding wire outlet hole 21 more smoothly.

[0057] In some embodiments, the cable lead-out groove 101 and the pressing boss 13 are interference-fitted to ensure sealing between the pressing boss 13 and the groove wall of the cable lead-out groove 101 .

[0058] In some embodiments, the motor further includes a second end cover 300, which is connected to the second end of the stator assembly 100, and the second end cover 300 is the motor end cover mentioned above. Specifically, the second end cover 300 is the shaft end cover (also called the front end cover) of the motor, which has a conductive column 11 like the first end cover 200, and at this time, a second electrical connection hole 1022 for plugging and electrically connecting with the conductive column 11 is correspondingly formed on the second end surface of the stator core 102, and different from the first end cover 200, the second end cover 300 is not provided with a corresponding pressing boss 13.

[0059] In another specific embodiment, the first end cover 200 and the second end cover 300 are both formed with corresponding limit buckle points 14 on the side facing the stator assembly 100 , so as to reliably limit the circumferential direction of the motor end cover when assembled on the stator assembly 100 .

[0060] In a specific embodiment, the stator assembly 100 is a plastic-encapsulated stator assembly, and corresponding through holes are also provided on the plastic encapsulation material at positions corresponding to the first electrical connection holes 1021 and the second electrical connection holes 1022 .

[0061] According to an embodiment of the present invention, an air conditioner is also provided, comprising the above-mentioned motor. Due to the use of the motor described above, by providing a conductive column 11 extending along the axial direction on the first side end surface of the end cover body 1, the conductive column 11 can contact with the stator core 102 in the motor to form an electrical connection when the motor end cover is assembled on the motor, so that the occurrence of electrical corrosion of the motor can be prevented without providing a conductive tape (or copper rod) on the outside of the motor as in the prior art. The conductive column 11 can achieve electrical connection with the stator core 102 after the motor end cover is assembled, and no separate assembly is required, which is very simple and convenient.

[0062] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A motor end cover, characterized in that: The motor comprises an end cover body (1), wherein a conductive column (11) extending along the axial direction is arranged on a first side end face of the end cover body (1), the end cover body (1) is made of conductive material, and a bearing chamber (12) for assembling a bearing is also formed on the first side end face; when the motor end cover is assembled at the end of the motor, the conductive column (11) can contact with a stator core (102) in the motor to form an electrical connection.

2. The motor end cover according to claim 1, characterized in that: The conductive column (11) and the end cover body (1) are integrally formed.

3. The motor end cover according to claim 1, characterized in that: A pressing boss (13) is also provided on the first side end surface, and the pressing boss (13) is used to press the outlet sealing sleeve (2) of the motor.

4. The motor end cover according to claim 3, characterized in that: The conductive column (11) is located on the pressing surface of the pressing boss (13).

5. The motor end cover according to claim 4, characterized in that: The conductive posts (11) include two conductive posts (11), the two conductive posts (11) are arranged at an interval, and the outlet hole (21) of the outlet sealing sleeve (2) is located within the interval between the two conductive posts (11).

6. A motor, comprising a stator assembly (100) and a first end cover (200) connected to a first end of the stator assembly (100), characterized in that: The first end cover (200) is the motor end cover according to any one of claims 1 to 5, a cable lead-out groove (101) is formed at the first end of the stator assembly (100), a cable lead-out sealing sleeve (2) is arranged in the cable lead-out groove (101), the cable lead-out sealing sleeve (2) has a positioning through hole (22) passing through both ends of the stator assembly (100) along the axial direction, and the conductive column (11) passes through the positioning through hole (22) to be electrically connected to the end face of the stator core (102) in the stator assembly (100) facing the first end.

7. The motor according to claim 6, characterized in that A first electrical connection hole (1021) is formed on the end surface of the stator core (102) facing the first end, and the free end of the conductive column (11) is inserted into the first electrical connection hole (1021).

8. The motor according to claim 7, characterized in that The material of the outlet sealing sleeve (2) is rubber.

9. The motor according to claim 8, characterized in that The wire outlet hole (21) of the wire outlet sealing sleeve (2) passes through the inner and outer sides of the stator assembly (100), and when the motor end cover includes a holding boss (13), the wire outlet sealing sleeve (2) has a sealing mating surface that matches the holding boss (13), and a wire entry seam (23) is provided on the sealing mating surface, and the wire entry seam (23) is communicated with the wire outlet hole (21).

10. The motor according to claim 9, characterized in that The cable lead-out groove (101) and the pressing boss (13) are in interference fit; and / or the cross section of the cable entry seam (23) is Y-shaped.

11. The motor according to claim 6, characterized in that It also includes a second end cover (300), wherein the second end cover (300) is connected to the second end of the stator assembly (100), and the second end cover (300) is the motor end cover according to claim 1 or 2.

12. An air conditioner, characterized in that: A motor comprising the motor according to any one of claims 6 to 11.

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