A temperature self-regulating permanent magnet brushless DC fan for refrigerators

Abstract

The present invention discloses a temperature-self-regulating permanent magnet brushless DC fan for a refrigerator, comprising a casing and a rear end cover, characterized in that: bearings are fixedly installed inside the casing and the rear end cover, a retaining ring is fixedly installed on the outer side of the bearing, a rotor assembly is slidably connected inside the bearing, a stator assembly is sleeved on the outer side of the rotor assembly, a conical elastic washer is fixedly installed between the rear end cover and the rotor assembly, a connecting cover is fixedly installed on the right side of the rear end cover, a sliding cover is bonded to the outer side of the casing, a fixed shell is bonded to the outer side of the rear end cover, the sliding cover and the fixed shell are slidably connected, a sealing ring is maintained between the sliding cover and the fixed shell, a through hole is provided on the inner side of the sliding cover, a fixing hole is provided on the inner side of the fixed shell, and the through hole is aligned with the fixing hole. The present invention has the characteristics of fast assembly and uniform heat dissipation.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular to a temperature-self-regulating permanent magnet brushless DC fan for a refrigerator. Background Art

[0002] A permanent magnet brushless motor is a permanent magnet motor that uses electronic circuit commutation or current control. There are two types of permanent magnet brushless motors: sinusoidal and square wave. Those with rectangular drive current are typically called permanent magnet brushless DC motors, while those with sinusoidal drive current are typically called permanent magnet AC servo motors.

[0003] Existing brushless DC fans have complex internal structures and production processes, making them impractical. They also suffer from poor sealing and susceptibility to moisture. Long-term fan operation can easily overheat the motor, leading to burn-in and high motor noise. Therefore, a temperature-regulating permanent magnet brushless DC fan for refrigerators, characterized by fast assembly and uniform heat dissipation, is highly desirable. Summary of the Invention

[0004] The object of the present invention is to provide a temperature self-regulating permanent magnet brushless DC fan for a refrigerator to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a temperature-self-regulating permanent magnet brushless DC fan for a refrigerator, comprising a casing and a rear end cover, characterized in that bearings are fixedly installed inside the casing and the rear end cover, a retaining ring is fixedly installed on the outside of the bearing, a rotor assembly is slidably connected inside the bearing, a stator assembly is sleeved on the outside of the rotor assembly, a conical elastic washer is fixedly installed between the rear end cover and the rotor assembly, and a connecting cover is fixedly installed on the right side of the rear end cover.

[0006] According to the above technical solution, a sliding cover is bonded to the outer side of the casing, and a fixed shell is bonded to the outer side of the rear end cover. The sliding cover and the fixed shell are slidably connected, and the sliding cover and the fixed shell are sealed by a sealing ring. A through hole is opened on the inner side of the sliding cover, and a fixing hole is opened on the inner side of the fixed shell. The through hole is aligned with the fixing hole, and the sliding cover and the fixed shell are fixed together by cards, nuts and bolts.

[0007] According to the above technical solution, the rotor assembly includes a transmission shaft, the outer side of the transmission shaft is connected to the rotor core, fans are fixedly installed on the outer sides of both ends of the rotor core, and balancing holes are opened between adjacent fans, and the number of balancing holes at both ends is the same.

[0008] According to the above technical solution, the stator assembly includes a stator and an electric control board, and the stator and the electric control board are plug-connected.

[0009] According to the above technical solution, a stator core is provided inside the stator, and slots are provided around the inner wall of the stator core. The number of the slots is nine. Stator teeth are provided between the slots, and the tooth ends of the stator teeth are provided with pole shoes.

[0010] According to the above technical solution, Hall elements A, B, and C are respectively arranged between adjacent sides of the stator teeth, and stator coils are wound around the surfaces of the stator teeth. The Hall elements A, B, and C are electrically connected to the electronic control board, and the number of the stator coils is nine groups.

[0011] According to the above technical solution, the inner wall of the rotor is provided with permanent magnet S poles and permanent magnet N poles, and the number of the permanent magnet S poles and permanent magnet N poles is three and they are arranged alternately.

[0012] According to the above technical solution, the rotor is made of sintered magnetic ring Y30, and the sintered magnetic ring and the transmission shaft are connected by injection molding using low-cost plastic POM.

[0013] According to the above technical solution, a rubber shock-absorbing sleeve is fixedly installed on the outer side of the bearing.

[0014] According to the above technical solution, a connector is provided on the outside of the housing.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) By providing a Hall sensor and a 9-slot 6-pole structure, a concentrated winding is realized, which makes the motor have the advantages of excellent torque characteristics, small detent torque, and small torque ripple. At the same time, the harmonics generated by the slots are in opposite phase to the harmonics generated by the stator. The harmonics generated by the slots will offset the P-th harmonics of the original harmful harmonic components generated by the stator, thereby reducing the slot torque, avoiding vibration, and achieving low-noise operation of the motor;

[0017] (2) By providing the balancing holes, the movable plate inside the rotor rotates, generating wind force to dissipate heat inside. The setting of the balancing holes allows the wind force to flow through the inside of the rotor, promoting the uniform distribution of internal heat, thereby avoiding the problem of local temperature rise. The setting of the balancing holes also reduces the weight error on both sides of the rotor, thereby reducing the vibration generated when the motor rotates.

[0018] (3) By providing a sliding cover and a fixed shell, and utilizing the rotational positioning relationship between the sliding cover and the fixed shell, the positioning and fixation of the parts are achieved, thereby avoiding the use of installation fasteners to achieve the positioning and fixation of the parts, simplifying the assembly process, improving the assembly efficiency, and at the same time improving the sealing performance, thereby preventing the internal mechanism from being damp and dusty. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 It is a schematic diagram of the overall front cross-sectional structure of the present invention;

[0021] Figure 2 is a side schematic view of the present invention;

[0022] Figure 3 is a schematic diagram of the rear end cover of the present invention;

[0023] Figure 4 is a schematic diagram of a casing of the present invention;

[0024] Figure 5 is a schematic diagram of the rotor assembly of the present invention;

[0025] Figure 6 is a schematic top view of the rotor of the present invention;

[0026] Figure 7 is a schematic diagram of a stator assembly of the present invention;

[0027] Figure 8 is a schematic diagram of the stator core of the present invention;

[0028] In the figure: 1. Casing; 2. Rear cover; 3. Card; 4. Nut; 5. Bolt; 6. Sliding cover; 7. Fixed housing; 8. Connector; 9. Sealing ring; 10. Rotor assembly; 11. Stator assembly; 12. Bearing; 13. Conical elastic washer; 14. Retaining ring; 15. Connecting cover; 16. Drive shaft; 17. Fan; 18. Stator core; 19. Stator teeth; 23. Electronic control board; 24. Stator; 26. Balancing hole. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] See also Figure 1-7The present invention provides a technical solution: a temperature-self-regulating permanent magnet brushless DC fan for a refrigerator, comprising a casing 1 and a rear end cover 2, characterized in that: bearings 12 are fixedly installed inside the casing 1 and the rear end cover 2, a retaining ring 14 is fixedly installed on the outside of the bearing 12, a rotor assembly 10 is slidably connected inside the bearing 12, a stator assembly 11 is sleeved on the outside of the rotor assembly 10, a conical elastic washer 13 is fixedly installed between the rear end cover 2 and the rotor assembly 10, and a connecting cover 15 is fixedly installed on the right side of the rear end cover 2; by providing the casing 1 and the rear end cover 2, the stator assembly 11 and the rotor assembly 10 are installed inside the casing 1 and the rear end cover 2 by utilizing the bearing 12 and the retaining ring 14, so that the internal structure is simple and clear, modular assembly is achieved, and assembly efficiency is improved.

[0031] The outer side of the casing 1 is bonded with a sliding cover 6, and the outer side of the rear end cover 2 is bonded with a fixed shell 7. The sliding cover 6 and the fixed shell 7 are slidably connected, and a sealing ring 9 is used to maintain the seal between the sliding cover 6 and the fixed shell 7. A through hole is provided on the inner side of the sliding cover 6, and a fixing hole is provided on the inner side of the fixed shell 7. The through hole is aligned with the fixing hole, and the sliding cover 6 and the fixed shell 7 are fixedly connected together by the card 3, nut 4 and bolt 5. When assembling, it is only necessary to snap the casing 1 and the rear end cover 2 together and then rotate them so that the fixing hole inside the fixed shell 7 is aligned with the through hole inside the sliding cover 6. Then, the casing 1 and the rear end cover 2 are fixedly connected together by the fastener card 3, nut 4 and bolt 5, thereby completing the assembly, making the assembly process simple, avoiding the installation of multiple fasteners to achieve the positioning and fixation of parts, simplifying the assembly process, and improving the efficiency of assembly. At the same time, the arrangement of the sliding cover 6 and the fixed shell 7 improves the installation strength, makes the sealing stronger, and prevents the internal mechanism from being affected by moisture and dust accumulation.

[0032] The rotor assembly 10 includes a transmission shaft 16, the outer side of the transmission shaft 16 is connected to the rotor core, and fans 17 are fixedly installed on the outer sides of both ends of the rotor core. Balancing holes 26 are opened between adjacent fans 17, and the number of balancing holes 26 at both ends is the same; when the motor rotates, the fan 17 inside the rotor will also rotate, generating wind to dissipate heat inside, and the setting of the balancing holes 26 allows the wind to flow through the inside of the rotor, promoting uniform distribution of internal heat, thereby avoiding the problem of local temperature rise, and the setting of the balancing holes reduces the weight error on both sides of the rotor, thereby reducing the vibration generated when the motor rotates.

[0033] The stator assembly 11 includes a stator 24 and an electric control board 23 , and the stator 24 and the electric control board 23 are plug-connected. The plug-connection between the stator 24 and the electric control board 23 allows the stator assembly 11 to be assembled quickly.

[0034] The stator 24 has a stator core 18 disposed inside. Nine slots are provided around the inner wall of the stator core 18 . Stator teeth 19 are disposed between the slots. Pole shoes are provided at the tooth ends of the stator teeth 19 .

[0035] Hall elements A, B, and C are respectively arranged between adjacent sides of the stator tooth pole 19. Stator coils are wound around the surface of the stator tooth pole 19. Hall elements A, B, and C are electrically connected to the electronic control board 23. There are nine groups of stator coils.

[0036] The inner wall of the rotor is provided with permanent magnet S poles and permanent magnet N poles respectively, and the number of permanent magnet S poles and permanent magnet N poles is three groups respectively and they are arranged alternately; through the setting of nine groups of stator tooth poles and stator coils, and the setting of the rotor core with eight magnetic poles, concentrated winding is realized, so that the motor has the advantages of excellent torque characteristics, small positioning torque and small torque fluctuation. At the same time, the harmonics generated by the slot are opposite to the harmonics generated by the stator. The harmonics generated by the slot will offset the P-th harmonic of the harmful harmonic component generated by the original stator, thereby reducing the slot torque, avoiding vibration, and realizing low-noise operation of the motor.

[0037] The rotor is made of sintered magnetic ring Y30, and the sintered magnetic ring and the transmission shaft 16 are connected by injection molding using low-cost plastic POM; the magnetic ring and the transmission shaft 16 are connected and fixed together by injection molding, which reduces production costs.

[0038] A rubber shock-absorbing sleeve is fixedly installed on the outer side of the bearing 12; the rubber shock-absorbing sleeve is used to reduce the vibration of the bearing 12 during the rotation of the motor, further reducing the noise generated by the motor.

[0039] A connector 8 is provided on the outside of the housing 1 ; by providing the connector 8 , the internal circuits are bundled together.

[0040] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A temperature self-regulating permanent magnet brushless DC fan for a refrigerator, comprising a housing (1) and a rear end cover (2), characterized in that: A bearing (12) is fixedly mounted inside the housing (1) and the rear end cover (2), a retaining ring (14) is fixedly mounted on the outside of the bearing (12), a rotor assembly (10) is slidably connected inside the bearing (12), a stator assembly (11) is sleeved on the outside of the rotor assembly (10), a conical elastic washer (13) is fixedly mounted between the rear end cover (2) and the rotor assembly (10), and a connecting cover (15) is fixedly mounted on the right side of the rear end cover (2); The outer side of the housing (1) is bonded with a sliding cover (6), and the outer side of the rear end cover (2) is bonded with a fixed housing (7). The sliding cover (6) and the fixed housing (7) are slidably connected, and a sealing ring (9) is used to maintain a seal between the sliding cover (6) and the fixed housing (7). A through hole is provided on the inner side of the sliding cover (6), and a fixing hole is provided on the inner side of the fixed housing (7). The through hole is aligned with the fixing hole. The sliding cover (6) and the fixed housing (7) are fixedly connected together by a card (3), a nut (4) and a bolt (5).

2. The temperature self-regulating permanent magnet brushless DC fan for a refrigerator according to claim 1, characterized in that: The rotor assembly (10) includes a transmission shaft (16), the outer side of the transmission shaft (16) is connected to the rotor core in a transmission manner, fans (17) are fixedly installed on the outer sides of both ends of the rotor core, and balancing holes (26) are provided between adjacent fans (17), and the number of the balancing holes (26) at both ends is the same.

3. The temperature self-regulating permanent magnet brushless DC fan for a refrigerator according to claim 2, characterized in that: The stator assembly (11) includes a stator (24) and an electric control board (23), and the stator (24) and the electric control board (23) are plug-connected.

4. The temperature self-regulating permanent magnet brushless DC fan for a refrigerator according to claim 3, characterized in that: A stator core (18) is provided inside the stator (24), and slots are provided around the inner wall of the stator core (18). The number of the slots is nine groups, and stator teeth (19) are provided between the slots. The tooth ends of the stator teeth (19) are all provided with pole shoes.

5. The temperature self-regulating permanent magnet brushless DC fan for a refrigerator according to claim 4, characterized in that: A Hall element A, a Hall element B, and a Hall element C are respectively arranged between adjacent sides of the stator tooth pole (19); a stator coil is wound around the surface of the stator tooth pole (19); the Hall element A, the Hall element B, and the Hall element C are electrically connected to the electric control board (23); and the number of the stator coils is nine groups.

6. The temperature self-regulating permanent magnet brushless DC fan for a refrigerator according to claim 5, characterized in that: The inner wall of the rotor is provided with permanent magnet S poles and permanent magnet N poles, respectively. The number of the permanent magnet S poles and the permanent magnet N poles is three and they are arranged alternately.

7. The temperature self-regulating permanent magnet brushless DC fan for a refrigerator according to claim 6, characterized in that: The rotor is made of sintered magnetic ring Y30, and the sintered magnetic ring and the transmission shaft (16) are connected by injection molding using low-cost plastic POM.

8. The temperature self-regulating permanent magnet brushless DC fan for a refrigerator according to claim 7, characterized in that: A rubber shock-absorbing sleeve is fixedly mounted on the outer side of the bearing (12).

9. The temperature self-regulating permanent magnet brushless DC fan for a refrigerator according to claim 8, characterized in that: A joint (8) is provided on the outside of the casing (1).

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