A split motor

Abstract

The present invention discloses a split motor, comprising an air duct and an armature module; the armature module comprises a housing, a stator assembly, a rotor assembly, and a PCB board; the housing is cylindrical, and the rotor assembly comprises a rotating shaft, a magnetic ring, a first bearing, and a second bearing; the housing has a first bearing chamber and a second bearing chamber; and an elastic member is provided between the first bearing and the magnetic ring; the air duct comprises an inner ring and an outer ring arranged concentrically; the inner ring is structured to form a circular through cavity adapted to the housing; a ventilation cavity is formed between the inner ring and the outer ring, and a plurality of guide plates are provided in the ventilation cavity. In this way, by designing a split motor, the assembly convenience of the motor is improved, and, through the specific design of the motor, it has the advantages of low noise and stable operation.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to a split motor, which is mainly but not limitedly used in hair dryers. Background Art

[0002] The motor is an essential component of a hair dryer. Its power and quality directly impact the lifespan and user experience of the hair dryer. To reduce noise, increase airflow, and extend the motor's lifespan, various motors are now available on the market.

[0003] For example, the Chinese patent with the announcement number CN217335308 U discloses a motor for a hair dryer. In order to improve the stability of the rotor during rotation, reduce vibration and reduce noise, in this patented technology, a bearing is provided on the rotating shaft of the rotor assembly, and two bearings are provided on one side of the magnetic ring. Although it can reduce vibration to a certain extent, it still has some shortcomings. First, the armature length of this motor structure cannot be designed to be too long. If it is too long, when the motor rotates at high speed, its vibration becomes more obvious and the noise is also louder. Therefore, the power density of this motor is also relatively small, and it is not suitable for higher-speed rotation. In addition, the air duct used by this motor needs to be clamped and processed twice on the machine tool after the mold is manufactured, which reduces production efficiency.

[0004] There are also motors with other structures, such as the Chinese patent with publication number CN217590465 U, which discloses a motor for a hair dryer. In this patent, bearings are provided at both ends of the rotating shaft of the rotor assembly to improve stability; however, this technology also has some shortcomings: since one bearing chamber is provided in the air duct and the other bearing chamber is provided on the rear cover, the straightness of the two bearing chambers is poor. When the rotor assembly rotates, the forces on the two bearings are inconsistent, which still generates a lot of noise; and during assembly, the rear cover is locked to the air duct by screws, which is also more troublesome during assembly.

[0005] Therefore, it is necessary to study a new technical solution to solve the above problems. Summary of the Invention

[0006] In order to solve the defects and shortcomings of the above-mentioned prior art, the present invention provides a split motor, which improves the assembly convenience of the motor by designing a split motor, and through the specific design of the motor, it has the advantages of low noise and stable operation.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A split motor includes an air duct and an armature module; the armature module includes a housing and a stator assembly, a rotor assembly, and a PCB board installed in the housing; the housing is cylindrical with an internal mounting cavity, and a notch is provided on the housing to communicate with the mounting cavity; wherein:

[0009] The rotor assembly includes a rotating shaft, a magnetic ring disposed on the rotating shaft, a first bearing disposed at the upper end of the rotating shaft, and a second bearing disposed at the lower end of the rotating shaft; correspondingly, the housing has a first bearing chamber adapted for the first bearing and a second bearing chamber adapted for the second bearing; and an elastic member is disposed between the first bearing and the magnetic ring;

[0010] The air duct includes an inner ring and an outer ring which are arranged concentrically; the inner ring is structured to form a circular through cavity adapted to the housing; a ventilation cavity is formed between the inner ring and the outer ring, and a plurality of guide plates are arranged in the ventilation cavity.

[0011] As a preferred solution, the first bearing chamber is protruded from the upper end of the casing, and the second bearing chamber is protruded from the lower end of the casing.

[0012] As a preferred solution, the notch of the casing is arc-shaped, and the arc length is greater than one-third of the circumference of the casing and less than two-thirds of the circumference of the casing.

[0013] As a preferred solution, the casing is made of aluminum alloy, zinc alloy or stainless steel.

[0014] As a preferred solution, the inner side wall of the first bearing chamber and / or the outer side surface of the first bearing is provided with a first rubber storage groove;

[0015] Alternatively, the inner side wall of the second bearing chamber and / or the outer side surface of the second bearing is provided with a first rubber storage groove.

[0016] As a preferred solution, the first glue-containing groove is an annular groove.

[0017] As a preferred solution, a second rubber storage groove is provided at the bearing installation position of the rotating shaft.

[0018] As a preferred solution, the lower end face of the inner ring of the air duct is located behind the lower end face of the outer ring, and a receiving position for accommodating fan blades is formed between the lower end face of the inner ring and the lower end face of the outer ring; a fan blade is provided at the lower end of the rotating shaft, and the fan blade is located in the receiving position.

[0019] As a preferred solution, the fan blades are hardware or plastic parts.

[0020] As a preferred solution, the guide plate is curved with a certain slope; and the inclination angle of the guide plate is gradually reduced from bottom to top.

[0021] Compared with the prior art, the present invention has obvious advantages and beneficial effects, specifically:

[0022] 1. A first bearing and a second bearing are respectively provided at both ends of the rotating shaft. Compared with the cantilever arm structure of the existing motor, the swing amplitude of the rotor assembly is smaller and the noise is smaller. Moreover, the motor of the present application can ensure the smooth movement of the rotor assembly even when the armature length is lengthened to increase the motor power density (increase the air volume during motor operation).

[0023] 2. During the casing processing, a first bearing chamber and a second bearing chamber are formed. Compared with the existing technology, the two bearing chambers are formed by one-time clamping and processing of precision machine tools, which can ensure the straightness of the first bearing and the second bearing during subsequent assembly, and make the first bearing and the second bearing more evenly stressed when the motor is working, which is more conducive to reducing motor noise and extending motor life.

[0024] 3. During assembly, the entire armature module is placed in the circular through cavity, and then reinforced with glue or pressed in through interference fit. Compared with the existing technology, this reduces the need for assembly steps such as screw locking, and the assembly efficiency is higher.

[0025] 4. The structure of the air duct is simpler than the existing technology. The existing air duct design needs to undergo two clamping processes after demolding, while the air duct of this application only needs one clamping process to be fixed after demolding; one clamping step is reduced, production efficiency is improved, and one clamping process also has the advantage of ensuring product accuracy and product consistency.

[0026] 5. An elastic member is provided between the first bearing and the magnetic ring, thereby effectively reducing the mechanical noise caused by the bearing clearance of the motor and improving the user experience of the motor (hair dryer).

[0027] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic perspective view of an embodiment of the present invention;

[0029] Figure 2 A three-dimensional schematic diagram of another angle of an embodiment of the present invention;

[0030] Figure 3 A first exploded schematic diagram of an embodiment of the present invention;

[0031] Figure 4A second exploded schematic diagram of an embodiment of the present invention;

[0032] Figure 5 A schematic cross-sectional view of an embodiment of the present invention;

[0033] Figure 6 is a three-dimensional schematic diagram of an armature module in an embodiment of the present invention;

[0034] Figure 7 is a three-dimensional schematic diagram of a housing in an embodiment of the present invention;

[0035] Figure 8 is a three-dimensional schematic diagram of an air duct in an embodiment of the present invention;

[0036] Figure 9 Schematic cross-sectional view of a casing in an embodiment of the present invention.

[0037] Description of the accompanying drawings:

[0038] 10. Air duct; 11. Inner ring; 111. Circular through cavity; 12. Outer ring; 13. Ventilation cavity; 131. Guide plate; 14. Container; 20. Armature module; 21. Casing; 211. Mounting cavity; 212. Notch; 213. First bearing chamber; 2131. First rubber groove; 214. Second bearing chamber; 215. Wire hole; 22. Stator assembly; 23. Rotor assembly; 231. Rotating shaft; 2311. Second rubber groove; 232. Magnetic ring; 233. First bearing; 234. Second bearing; 235. Elastic member; 236. First sleeve; 237. Second sleeve; 24. PCB board; 25. Fan blade. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in this embodiment of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiment is only a preferred embodiment of the present invention.

[0040] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] Refer to the attached Figures 1 to 9 In an embodiment of the present invention, a split-type motor includes an air duct 10 and an armature module 20. The armature module 20 includes a housing 21 and a stator assembly 22, a rotor assembly 23, and a PCB board 24 mounted within the housing 21. The housing 21 is cylindrical and has a mounting cavity 211 therein. Furthermore, the housing 21 is provided with a notch 212 that communicates with the mounting cavity 211. Specifically,

[0043] The rotor assembly 23 includes a rotating shaft 231, a magnetic ring 232 disposed on the rotating shaft 231, a first bearing 233 disposed at the upper end of the rotating shaft 231, and a second bearing 234 disposed at the lower end of the rotating shaft 231. Accordingly, the housing 21 has a first bearing chamber 213 adapted for the first bearing 233 and a second bearing chamber 214 adapted for the second bearing 234. The first bearing chamber 213 is protruding from the upper end of the housing 21, and the second bearing chamber 214 is protruding from the lower end of the housing 21. An elastic member 235 is disposed between the first bearing 233 and the magnetic ring 232.

[0044] The air duct 10 includes an inner ring 11 and an outer ring 12 which are arranged concentrically. The inner ring 11 forms a circular through cavity 111 adapted to the housing 21 . A ventilation cavity 13 is formed between the inner ring 11 and the outer ring 12 , and a plurality of guide plates 131 are provided in the ventilation cavity 13 .

[0045] During assembly, the stator assembly 22 and PCB board 24 are placed into the mounting cavity 211 of the housing 21 through the notch 212 of the housing 21. The rotor assembly 23 is inserted into the second bearing chamber 214 at the lower end of the housing 21 and mounted on the housing 21. This forms the armature module 20. The entire armature module 20 is then placed into the central cavity of the air duct 10. Glue can be applied to the contact surface of the housing 21 with the circular cavity 111 to further secure the connection between the armature module 20 and the air duct 10. Alternatively, an interference fit alone or a combination of an interference fit and glue can be used to further enhance the connection stability.

[0046] Furthermore, the PCB board 24 is arranged at the upper end of the magnetic ring 232, and the housing 21 is provided with a corresponding wire hole 215. Preferably, the wire hole 215 is provided on the upper end surface of the housing 21 and is located at the edge, so as to facilitate machine tool processing. It should be added that: in this embodiment, since the wiring method of the PCB board 24 adopts a lead type, a corresponding wire hole is provided on the housing 21; in other embodiments, the wiring method of the PCB board 24 can also be through terminal conduction, and it is only necessary to expose the PCB board 24 with the terminal seat welded to the outside of the housing 21, and then the PCB board 24 is welded and fixed to the stator assembly 22 through the pin.

[0047] At the same time, if Figure 9 As shown, the notch 212 of the housing 21 is arc-shaped, with an arc length greater than one-third of the circumference of the housing 21 and less than two-thirds of the circumference of the housing 21. In actual applications, the arc length of the notch 212 is preferably equal to one-half of the circumference of the housing 21. This facilitates the installation of components such as the stator assembly 22 into the housing 21.

[0048] It should be noted that the motor of this application is mainly, but not limited to, used in hair dryer products. By improving the motor into a split design, this application has the following advantages:

[0049] 1. A first bearing 233 and a second bearing 234 are respectively provided at both ends of the rotating shaft 231. Compared with the cantilever arm structure of the existing motor (such as CN217335308 U and CN21369626; two or one bearing is provided on one side of the rotating shaft 231), the swing amplitude of the rotor assembly 23 is smaller and the noise is smaller. Moreover, the motor of the present application can ensure the smooth movement of the rotor assembly 23 even when the armature length is increased to increase the motor power density (increase the air volume during motor operation).

[0050] 2. The housing 21 is a hardware part (preferably aluminum alloy, of course, it can also be zinc alloy or stainless steel), which is clamped and processed by a precision machine tool at one time. During the processing of the housing 21, a first bearing chamber 213 and a second bearing chamber 214 are formed. Compared with the existing technology (such as CN217590465 U), the two bearing chambers are formed by clamping and processing by a precision machine tool at one time, which can ensure the straightness of the first bearing 233 and the second bearing 234 during subsequent assembly, so that the first bearing 233 and the second bearing 234 are subjected to more uniform force when the motor is working, which is more conducive to reducing motor noise and extending motor life.

[0051] It should be added that: through the split design, the concentricity of the two bearing chambers (holes) is smaller, reaching a concentricity of 0.001mm. In the traditional method of setting the two bearing chambers in the air duct 10 and the rear cover respectively, the concentricity of the two bearing chambers can only reach the 0.01mm level; thereby, the working stability of the motor is further improved and the working noise is reduced.

[0052] 3. During assembly, the entire armature module 20 is placed into the circular through cavity 111 and then reinforced with glue or pressed in with a slight interference fit. Compared with the existing technology (such as CN217590465 U), the need for screw locking and other assembly steps is reduced, and the assembly efficiency is higher.

[0053] 4. The structure of the air duct 10 is simpler than that of the existing technology. The existing air duct 10 design (such as CN217335308 U, CN217590465 U) needs to be processed on a machine tool after demolding. The specific processing steps are: first, clamp and fix one end (upper end) of the air duct 10, and process the air duct 10; after the processing is completed, take out the air duct 10, clamp and fix the other end (lower end) of the air duct 10, and process one end surface (upper end surface) of the air duct 10.

[0054] The air duct 10 of the present application only needs to be clamped and fixed at its upper end after being ejected from the mold, and then the air duct 10 can be processed. After processing is completed, it can be removed and the processing is completed. This reduces one clamping step, improves production efficiency, and the one-time clamping process also has the advantage of ensuring product accuracy and consistency.

[0055] It should be noted that the air duct 10 of the present application is usually a hardware part (i.e., made of metal materials such as zinc); however, when the structural strength requirements of the air duct 10 are not high, the air duct 10 of the present application can also be made of plastic, thereby further reducing production costs; that is, the split design of the present application also provides a new idea for manufacturers to control production costs.

[0056] 5. An elastic member 235 is disposed between the first bearing 233 and the magnetic ring 232, effectively reducing mechanical noise caused by bearing play in the motor and improving the user experience of the motor (hair dryer). Specifically, the elastic member 235 is typically a spring. Typically, the rotating shaft 231 is provided with a first sleeve 236 and a second sleeve 237 at the upper and lower ends of the magnetic ring 232, respectively. The spring (elastic member 235) is disposed between the first bearing 233 and the first sleeve 236.

[0057] Preferably, the inner wall of the first bearing chamber 213 and / or the outer surface of the first bearing 233 are provided with first glue grooves 2131. Similarly, the inner wall of the second bearing chamber 214 and / or the outer surface of the second bearing 234 are preferably provided with first glue grooves 2131. The provision of the first glue grooves 2131 to accommodate glue further enhances the adhesion between the bearing and the bearing chamber, ensuring a more secure connection, more stable operation, and less noise. Specifically, the first glue grooves 2131 can be annular. Typically, the depth of the annular grooves is 0.02 to 0.10 mm. Furthermore, one to three first glue grooves 2131 can be provided on the inner wall of the first bearing chamber 213 and the inner wall of the second bearing chamber 214.

[0058] Preferably, the shaft 231 may also be provided with a second glue groove 2311 at the location corresponding to the bearing mounting. This second glue groove 2311 is used to accommodate glue, thereby further improving the assembly stability between the shaft 231 and the bearing. Typically, the second glue groove 2311 is annular and has a depth of 0.02 to 0.10 mm. Specifically, one or two second glue grooves 2311 may be provided at the location corresponding to the first bearing 233 on the shaft 231, and one or two may be provided at the location corresponding to the second bearing 234 on the shaft 231. Alternatively, the second glue groove 2311 may be a knurled groove.

[0059] Specifically, the lower end surface of the inner ring 11 of the air duct 10 is located behind the lower end surface of the outer ring 12, such that: a receiving position 14 for accommodating a fan blade 25 is formed between the lower end surfaces of the inner ring 11 and the lower end surfaces of the outer ring 12; the fan blade 25 is disposed at the lower end of the rotating shaft 231, and the fan blade 25 is located in the receiving position 14. Preferably, the fan blade 25 is a hardware component; specifically, the fan blade 25 is preferably made of a magnesium-aluminum alloy, which has the advantage of being lighter and having a structural strength that can meet the operating requirements of the motor; and the fan blade 25 has 13 blades. Of course, the fan blade 25 can also be a traditional aluminum alloy or plastic component.

[0060] It should be noted that the guide plate 131 is arranged vertically and is curved with a certain slope; specifically, the inclination angle of the guide plate 131 is set to gradually decrease from bottom to top. In this way, by converting the deflected airflow at the front end of the air duct 10 into an axial flow, the airflow can be discharged quickly. Specifically, the front end of the air duct 10 is provided with left and right blades 25, and the airflow introduced by the blades 25 is deflected in a non-vertical direction. The front end of the guide plate 131 is then configured accordingly, and the rear end is configured as a straight line, thereby guiding the airflow into an axial flow and quickly discharging it.

[0061] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A split motor, characterized in that: The invention comprises an air duct and an armature module; the armature module comprises a housing and a stator assembly, a rotor assembly, and a PCB board installed in the housing; the housing is cylindrical with an internal mounting cavity, and a notch is provided on the housing to communicate with the mounting cavity; wherein: The rotor assembly includes a rotating shaft, a magnetic ring disposed on the rotating shaft, a first bearing disposed at the upper end of the rotating shaft, and a second bearing disposed at the lower end of the rotating shaft; accordingly, the housing has a first bearing chamber adapted for the first bearing and a second bearing chamber adapted for the second bearing; and an elastic member is disposed between the first bearing and the magnetic ring. During assembly, the stator assembly and the PCB board are placed into the mounting cavity of the housing through the notch of the housing, and the rotor assembly is inserted into the second bearing chamber at the lower end of the housing and installed in the housing; The air duct includes an inner ring and an outer ring which are arranged concentrically; the inner ring is structured to form a circular through cavity adapted to the housing; a ventilation cavity is formed between the inner ring and the outer ring, and a plurality of guide plates are arranged in the ventilation cavity.

2. A split motor according to claim 1, characterized in that: The first bearing chamber is protruded from the upper end of the housing, and the second bearing chamber is protruded from the lower end of the housing.

3. A split motor according to claim 2, characterized in that: The notch of the casing is arc-shaped, and the arc length is greater than one-third of the circumference of the casing and less than two-thirds of the circumference of the casing.

4. A split motor according to any one of claims 1 to 3, characterized in that: The casing is made of aluminum alloy, zinc alloy or stainless steel.

5. The split motor according to claim 4, characterized in that: The inner side wall of the first bearing chamber and / or the outer side surface of the first bearing are provided with a first rubber storage groove; Alternatively, the inner side wall of the second bearing chamber and / or the outer side surface of the second bearing is provided with a first rubber storage groove.

6. The split motor according to claim 5, characterized in that: The first glue-hiding groove is an annular groove.

7. The split motor according to claim 4, characterized in that: A second rubber storage groove is provided at the bearing installation position of the rotating shaft.

8. The split motor according to claim 4, characterized in that: The lower end surface of the inner ring of the air duct is located behind the lower end surface of the outer ring, and a receiving position for receiving a fan blade is formed between the lower end surface of the inner ring and the lower end surface of the outer ring; a fan blade is provided at the lower end of the rotating shaft, and the fan blade is located in the receiving position.

9. The split motor according to claim 8, characterized in that: The fan blades are hardware parts or plastic parts.

10. The split motor according to claim 9, characterized in that: The guide plate is in a curved shape with a certain slope; and the inclination angle of the guide plate is set to gradually decrease from bottom to top.

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