Outer rotor motor for small washing machine

Abstract

The external rotor motor comprises a magnet, a fixing ring and a rotor shell provided with an accommodating cavity, the top of the accommodating cavity is provided with an opening, the magnet is fixed in the accommodating cavity through the fixing ring, the inner side wall of the accommodating cavity is provided with a plurality of clamping grooves, and the outer side wall of the fixing ring is provided with clamping pieces matched with the clamping grooves. The top of the clamping groove is provided with an insertion opening allowing the clamping piece to be inserted, and the top face of the fixing ring does not exceed the containing cavity. The utility model can effectively solve the problem of long production cycle of the existing external rotor motor. The assembling process is completed by inserting the clamping piece into the clamping groove from the top, the fixing ring and the rotor shell are fixed together without waiting, and the assembling period is greatly shortened. In addition, a plurality of clamping grooves are formed in the inner side wall of the containing cavity, so that the fixing ring and the rotor shell are fixed more firmly, the fixing ring and the rotor shell cannot be loosened even if the temperature rises after the motor operates for a long time, the motor is kept to have a low height, and the motor can better adapt to a narrow installation space.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to an outer rotor motor for a small washing machine. Background Art

[0002] In order to wash clothes more hygienically, many underwear washing machines are now available on the market. Since they are used to wash small items and are mostly the second washing machine in the home, it is necessary to make the small washing machine thinner and reduce the manufacturing cost.

[0003] Existing external rotor motors all use iron rotor shells. In order to reduce costs, the rotor shell material is replaced with plastic material, which not only ensures cost reduction but also reduces the weight of the motor, and has certain corrosion resistance when used in a long-term humid environment such as a washing machine. However, the fixing ring that fixes the magnet is still an iron component. Plastic and metal are generally bonded with epoxy resin, but the curing of epoxy resin glue takes a certain amount of time, which prolongs the entire motor manufacturing time and reduces manufacturing efficiency. Utility Model Content

[0004] The utility model aims to provide an outer rotor motor for a small washing machine, which can effectively solve the problem of long production cycle of the existing outer rotor motor.

[0005] In order to solve the above technical problems, the utility model is achieved through the following technical solutions:

[0006] An outer rotor motor for a small washing machine comprises a magnet, a fixing ring and a rotor housing provided with a receiving cavity, wherein an opening is provided at the top of the receiving cavity, the magnet is fixed in the receiving cavity through the fixing ring, a plurality of slots are provided on the inner side wall of the receiving cavity, a clamping piece matching the slots is provided on the outer side wall of the fixing ring, a socket for inserting the clamping piece is provided at the top of the slot, and the top surface of the fixing ring does not exceed the receiving cavity.

[0007] In the outer rotor motor for the small washing machine, a clamping portion is provided at the insertion opening of the clamping slot, and the clamping portion protrudes toward the clamping member.

[0008] In the above-mentioned outer rotor motor for a small washing machine, the clamping portion is arranged on the end surface of the insertion opening facing the center of the accommodating cavity.

[0009] In the above-mentioned outer rotor motor for a small washing machine, the cross section of the clamping portion is arc-shaped; or the clamping portion is provided with guide surfaces along the insertion and extraction directions of the clamping piece.

[0010] In the outer rotor motor for the small washing machine, the bottom of the accommodating cavity is provided with a boss protruding upward, and the bottom of the fixing ring abuts against the boss.

[0011] In the above outer rotor motor for a small washing machine, the thickness of the boss is equal to the thickness of the fixing ring.

[0012] In the outer rotor motor for the small washing machine, a plurality of fixing grooves for fixing the magnets are formed on the inner wall of the fixing ring, and adjacent fixing grooves are arranged at intervals.

[0013] In the above-mentioned outer rotor motor for a small washing machine, the slot is a straight slot, and the length direction of the slot is parallel to the axial direction of the rotor housing.

[0014] In the outer rotor motor for the small washing machine, a plug hole is opened at the center of the rotor housing. The outer rotor motor includes a motor shaft, and the end of the motor shaft is fitted under the plug hole to make the motor shaft and the rotor housing rotate synchronously.

[0015] In the above-mentioned outer rotor motor for a small washing machine, the slots are evenly distributed on the inner side wall of the accommodating cavity.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] The fixing ring and the rotor housing are fixed together by the cooperation of the card slot and the card connector, which can effectively solve the problem of long production cycle of the existing external rotor motor. The assembly process is completed by inserting the card connector into the card slot from the top, and the fixing ring and the rotor housing are fixed together without waiting, which greatly shortens the assembly cycle. In addition, multiple card slots are opened on the inner wall of the accommodating cavity, so that the fixing ring and the rotor housing are fixed more firmly, and the fixing ring and the rotor housing will not loosen even if the temperature rises after the motor runs for a long time; and the cooperation of the card slot and the card connector does not increase the thickness of the two after assembly, and can also maintain the original rotor size. The top surface of the assembly and the fixing ring does not exceed the accommodating cavity, so that the motor has a lower height and better adapts to the narrow installation space.

[0018] Furthermore, a clamping portion is provided at the insertion opening of the card slot, and the clamping portion protrudes toward the direction of the clamping member. The protruding clamping portion presses the clamping member into the card slot to prevent the clamping member from being separated from the insertion opening of the card slot.

[0019] Furthermore, the clamping portion is arranged on the end surface of the socket facing the center of the accommodating cavity. Thus, when the clamping piece is inserted into the clamping groove, the rotor housing can be deformed relatively easily to allow the clamping piece to pass through the clamping portion.

[0020] Furthermore, the cross section of the clamping part is arc-shaped; or the clamping part is provided with guide surfaces along the insertion and extraction directions of the clamping part. The clamping part is arranged in an arc shape or the guide surfaces are provided, which plays a guiding role when the clamping part is inserted or extracted, and is more convenient for the assembly and disassembly of the clamping part.

[0021] Furthermore, the bottom of the accommodating cavity is provided with an upwardly protruding boss, and the bottom of the fixing ring abuts against the boss. The boss allows the fixing ring to be suspended in the accommodating cavity, avoiding direct contact between the fixing ring and the bottom of the accommodating cavity, ensuring that all magnets on the fixing ring can correspond to the stator coil, so that all areas of the magnets can play a role.

[0022] Furthermore, the thickness of the boss is equal to the thickness of the fixing ring, so that the boss can completely hold the fixing ring to keep the fixing ring stable, and the boss can also support the magnet from below to prevent the magnet from sliding downward.

[0023] Furthermore, a plurality of fixing grooves for fixing the magnets are formed on the inner side wall of the fixing ring, and adjacent fixing grooves are arranged at intervals. The magnets are fixed by the fixing grooves, and the magnets are kept corresponding to the coils on the rotor.

[0024] Furthermore, the slot is a straight slot, and the length direction of the slot is parallel to the axial direction of the rotor housing. The straight slot is convenient for installation by inserting the connector, and the slot is parallel to the rotor axis to prevent the centrifugal force generated when the rotor rotates from causing the fixing ring to separate from the rotor housing.

[0025] Furthermore, a plug hole is formed in the center of the rotor housing, and the outer rotor motor includes a motor shaft, and the end of the motor shaft is adapted to the bottom of the plug hole so that the motor shaft and the rotor housing rotate synchronously. The motor shaft is inserted into the plug hole to facilitate fixing the relative position of the motor shaft and the rotor housing, and the rotor housing can drive the motor shaft to rotate.

[0026] Furthermore, the slots are evenly distributed on the inner wall of the accommodating cavity. When the rotor rotates, the evenly distributed slots can evenly disperse the circumferential force between the fixing ring and the rotor housing to avoid deformation caused by excessive force on a part of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a three-dimensional diagram of a rotor in an outer rotor motor for a small washing machine according to the utility model;

[0028] Figure 2 This is a three-dimensional diagram of a fixing ring in an outer rotor motor for a small washing machine of the utility model;

[0029] Figure 3 This is a three-dimensional diagram of a rotor housing in an outer rotor motor for a small washing machine of the utility model;

[0030] Figure 4 It is a top view of the fixing ring and the rotor housing after being matched in the utility model;

[0031] Figure 5 for Figure 4 Middle AA section view;

[0032] Figure 6 for Figure 5 A partial enlarged view of point B in the middle.

[0033] The accompanying drawings are marked as follows:

[0034] Magnet 10;

[0035] A fixing ring 20, a clamping piece 21, and a fixing groove 22;

[0036] The rotor housing 30, the accommodating cavity 31, the clamping groove 32, the clamping portion 33, the boss 34, and the insertion hole 35;

[0037] Stator 40;

[0038] Motor shaft 50. DETAILED DESCRIPTION

[0039] An outer rotor motor for a small washing machine comprises a magnet 10, a fixing ring 20 and a rotor housing 30 provided with a housing cavity 31. The housing cavity 31 has an opening at the top. The magnet 10 is fixed in the housing cavity 31 through the fixing ring 20. A plurality of slots 32 are provided on the inner side wall of the housing cavity 31. A clamping piece 21 cooperating with the slot 32 is provided on the outer side wall of the fixing ring 20. A socket for inserting the clamping piece 21 is provided on the top of the slot 32. The top surface of the fixing ring 20 does not exceed the housing cavity 31.

[0040] The fixing ring 20 and the rotor housing 30 are fixed together by the cooperation of the card slot 32 and the card connector 21, which can effectively solve the problem of long production cycle of the existing external rotor motor. By inserting the card connector 21 into the card slot 32 from the top, the assembly process is completed, and the fixing ring 20 and the rotor housing 30 are fixed together without waiting, which greatly shortens the assembly cycle. In addition, a plurality of card slots 32 are opened on the inner wall of the accommodating cavity 31, so that the fixing ring 20 and the rotor housing 30 are fixed more firmly, and the fixing ring 20 and the rotor housing 30 will not loosen even if the temperature of the motor rises after long-term operation; and the cooperation of the card slot 32 and the card connector 21 does not increase the thickness of the two after assembly, and can also maintain the original rotor size, and the top surface of the assembly and the fixing ring 20 does not exceed the accommodating cavity 31, so that the motor has a lower height and better adapts to the narrow installation space.

[0041] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships 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 should not be understood as a limitation on the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] See also Figures 1 to 6 This is an embodiment of an outer rotor motor for a small washing machine of the utility model. The outer rotor motor includes a rotor, which includes a magnet 10, a fixing ring 20 and a rotor housing 30 provided with a receiving cavity 31. The fixing ring 20 is generally made of metal, while the rotor housing 30 is made of plastic, which can effectively reduce the weight of the outer rotor motor and solve the cost. The receiving cavity 31 is open at the top, and the magnet 10 is fixed on the inner circumferential wall of the fixing ring 20, and the fixing ring 20 is fixed on the inner circumferential wall of the receiving cavity 31.

[0046] A plurality of slots 32 are provided on the inner side wall of the accommodating cavity 31, and a snap-in 21 adapted to the slots 32 is provided on the outer circumferential wall of the fixing ring 20. Generally speaking, the number of snap-in 21 is equal to the number of slots 32, and one snap-in 21 is connected to one slot 32. The snap-in 21 can be in the shape of a strip or a block. In order to achieve a better matching effect, the shape of the snap-in 21 and the slot 32 are consistent. A socket for inserting the snap-in 21 is provided at the top of the slot 32, that is, the fixing ring 20 is assembled into the accommodating cavity 31 from the top, and the assembly of the snap-in 21 and the slot 32 is completed at the same time when the fixing ring 20 is assembled into the accommodating cavity 31, and no more assembly steps are added. After the assembly is completed, the top surface of the fixing ring 20 does not exceed the accommodating cavity 31, so that not only the rotor housing 30 can fully protect the fixing ring 20 and the magnet 10, but also the subsequent matching of the rotor housing 30 and the stator 40 housing is convenient.

[0047] The fitting of the clip 21 and the slot 32 can be in the form of an interference fit to prevent the clip 21 from escaping from the slot 32. Preferably, a clip portion 33 is provided at the insertion end of the slot 32, and the clip portion 33 protrudes toward the clip 21. The protruding clip portion 33 abuts against the clip 21 in the slot 32 to prevent the clip 21 from escaping from the slot 32. During installation, the clip 21 can utilize the deformation of the plastic rotor housing 30 to pass through the position of the clip portion 33.

[0048] The cross-section of the card slot 32 is concave and includes three side surfaces, one facing the center of the accommodating cavity 31, and the other two side surfaces are arranged opposite to each other. The clamping portion 33 can be arranged on any side surface. In the present embodiment, the clamping portion 33 is arranged on the end surface of the socket facing the center of the accommodating cavity 31, so that when the clamping member 21 is inserted into the card slot 32, the clamping member 21 applies a radial outward force to the clamping portion 33, and the rotor housing 30 can be easily deformed to allow the clamping portion 33 to move out of position, so that the clamping member 21 can be smoothly inserted into the card slot 32, and then after the rotor housing 30 is restored, the clamping portion 33 abuts against the top of the clamping member 21 to prevent the clamping member 21 from slipping out of the card slot 32.

[0049] Furthermore, in order to allow the clamping part 33 to be pushed open when the clamping part 21 is inserted into the clamping slot 32, the cross-section of the clamping part 33 can be made into an arc shape, or guide surfaces can be provided on the clamping part 33 along the directions of insertion and removal of the fixing ring 20, so that the clamping part 21 can be easily pushed open to make room when the clamping part 21 is inserted or removed.

[0050] In order to facilitate the insertion of the clamping member 21 into the clamping slot 32, the clamping slot 32 is configured as a straight slot, and the length direction of the clamping slot 32 is parallel to the axial direction of the rotor housing 30. The clamping slots 32 are evenly distributed on the inner wall of the accommodating cavity 31, so that the force on the fixing ring 20 and the rotor housing 30 is as uniform as possible, avoiding deformation of the rotor housing 30 caused by excessive local force.

[0051] On the basis of the above embodiment, since the stator 40 also needs to extend into the accommodating cavity 31, and the stator 40 needs to maintain a sufficient distance from the bottom of the accommodating cavity 31, an upwardly protruding boss 34 is provided at the bottom of the accommodating cavity 31, and the bottom of the fixing ring 20 abuts against the boss 34, so that the magnet 10 on the fixing ring 20 can be kept completely corresponding to the coil of the stator 40, giving full play to the role of the magnet 10 on the fixing ring 20, and avoiding the magnet 10 from having a part that does not correspond to the coil of the stator 40. Further, the thickness of the boss 34 is equal to the thickness of the fixing ring 20, so that on the one hand, the fixing ring 20 can be completely pulled out, and a better abutment and fit can be formed between the two, and on the other hand, the magnet 10 on the fixing ring 20 can be supported to maintain the relative position of the magnet 10 along the axial direction of the rotor.

[0052] The magnet 10 can be fixed on the fixing ring 20 by bonding. In order to improve the assembly efficiency, a fixing groove 22 is opened on the fixing ring 20. Each magnet 10 is fixed in a fixing groove 22. Adjacent fixing grooves 22 are arranged at intervals to ensure that each magnet 10 can play a magnetic role. During assembly, just insert the magnet 10 into the fixing groove 22.

[0053] The outer rotor motor also includes a motor shaft 50. A socket 35 is opened at the bottom center of the accommodating cavity 31. The cross section of the socket 35 is non-circular. One end of the motor shaft 50 is inserted into the socket 35, so that when the rotor housing 30 rotates, the motor shaft 50 can be driven to rotate synchronously.

[0054] During assembly, first insert the magnet 10 into the fixing groove 22 of the fixing ring 20, then align the clip 21 on the outer circumference of the fixing ring 20 with the corresponding clip groove 32 on the rotor housing 30, apply force to the top surface of the fixing ring 20, so that the clip 21 is inserted into the clip groove 32. During the insertion process, the clip 21 will push open the clip part 33 on the socket, causing the rotor housing 30 to undergo slight elastic deformation. After the clip 21 is fully inserted into the clip groove 32, the clip part 33 loses the abutment of the clip 21, and the rotor housing 30 will return to its initial shape. The clip part 33 abuts against the top of the clip 21, thereby fixing the relative position of the clip 21 in the clip groove 32, thereby installing the fixing ring 20 and the rotor housing 30 in place. The above scheme is used to fix the fixing ring 20 and the rotor housing 30 together. No glue is needed during the assembly process. The assembly is completed after the clamping member 21 is fully inserted into the clamping slot 32, which greatly shortens the assembly time and maintains a firm connection between the fixing ring 20 and the rotor housing 30 so that the two can rotate synchronously.

[0055] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. An outer rotor motor for a small washing machine, comprising a magnet, a fixing ring and a rotor housing with a receiving cavity, wherein the top of the receiving cavity is provided with an opening, and the magnet is fixed in the receiving cavity by the fixing ring, characterized in that: A plurality of slots are formed on the inner wall of the accommodating cavity, a snap-in fitting matched with the slots is formed on the outer wall of the fixing ring, a socket for inserting the snap-in fitting is formed on the top of the slot, and the top surface of the fixing ring does not exceed the accommodating cavity.

2. An outer rotor motor for a small washing machine as claimed in claim 1, characterized in that: A clamping portion is provided at the insertion opening of the clamping slot, and the clamping portion protrudes toward the clamping piece.

3. An outer rotor motor for a small washing machine as claimed in claim 2, characterized in that: The clamping portion is arranged on the end surface of the socket facing the center of the accommodating cavity.

4. An outer rotor motor for a small washing machine as claimed in claim 2, characterized in that: The cross section of the clamping portion is arc-shaped; or the clamping portion is provided with guide surfaces along the insertion and extraction directions of the clamping piece.

5. The outer rotor motor for a small washing machine as claimed in claim 1, characterized in that: The bottom of the accommodating cavity is provided with a boss protruding upward, and the bottom of the fixing ring abuts against the boss.

6. An outer rotor motor for a small washing machine as claimed in claim 5, characterized in that: The thickness of the boss is equal to the thickness of the fixing ring.

7. An outer rotor motor for a small washing machine as claimed in claim 1, characterized in that: A plurality of fixing grooves for fixing magnets are formed on the inner side wall of the fixing ring, and adjacent fixing grooves are arranged at intervals.

8. The outer rotor motor for a small washing machine as claimed in claim 1, characterized in that: The slot is a straight slot, and the length direction of the slot is parallel to the axial direction of the rotor housing.

9. The outer rotor motor for a small washing machine as claimed in claim 1, characterized in that: A plug hole is opened at the center of the rotor shell. The outer rotor motor includes a motor shaft. The end of the motor shaft is adapted to the plug hole so that the motor shaft and the rotor shell rotate synchronously.

10. The outer rotor motor for a small washing machine as claimed in claim 1, characterized in that: The card slots are evenly distributed on the inner side wall of the accommodating cavity.

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