A micro motor structure

Abstract

A micro motor structure includes a housing, with brush assemblies symmetrically arranged on the outer side of the housing. A stator is housed inside the housing, and a rotor is housed inside the stator. A fixed impeller is located on the top of the stator, and a moving impeller is located on the top of the fixed impeller. An impeller cover is located on the outer side of the moving impeller. The rotor's drive shaft passes through a through hole in the middle of the fixed impeller and connects to the moving impeller. A sealing sleeve is fitted on the drive shaft between the rotor core and the moving impeller. The inner wall of the sealing sleeve is tightly fitted against the side wall of the drive shaft. The sealing sleeve is T-shaped, with its wider side close to the moving impeller. The advantages of this invention are: the sealing sleeve can prevent liquids, oil, hair, particles, etc., from entering the rotor core, achieving a good sealing effect; the T-shaped sealing sleeve, with its wider side close to the moving impeller, provides a larger coverage area, better blocking the aforementioned contaminants, resulting in good performance.

Description

Technical Field

[0001] This utility model relates to the field of vacuum cleaner motor technology, and more particularly to a micro motor structure for use in vacuum cleaners. Background Technology

[0002] A Chinese utility model patent with application number CN201921334502.2, entitled "A Vacuum Cleaner Motor with a Novel Rotor Core Structure," discloses a vacuum cleaner motor with a novel rotor core structure. This utility model includes a housing, with brush assemblies symmetrically arranged on the outer side of the housing. A stator is disposed inside the housing, and a rotor is disposed inside the stator. A fixed impeller is disposed on the top of the stator, and a moving impeller is disposed on the top of the fixed impeller. An impeller cover is disposed on the outer side of the moving impeller. This utility model has a reasonable and simple structure and is easy to operate. By adopting a novel rotor core structure, the motor's power, service life, and efficiency can be improved. However, the end sealing effect of the rotor core still has room for improvement; therefore, the structure of this device needs further refinement. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a micro motor structure with good sealing performance at the end of the rotor core, in view of the above-mentioned existing technology.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: This micro motor structure includes a housing, with brush assemblies symmetrically arranged on the outer side of the housing, a stator arranged inside the housing, a rotor arranged inside the stator, a fixed impeller arranged on the top of the stator, a moving impeller arranged on the top of the fixed impeller, and an impeller cover arranged on the outer side of the moving impeller. The characteristic is that the drive shaft of the rotor passes through the through hole in the middle of the fixed impeller and is connected to the moving impeller. A sealing sleeve is fitted on the drive shaft between the rotor core and the moving impeller. The inner wall of the sealing sleeve is tightly attached to the side wall of the drive shaft. The sealing sleeve is T-shaped, and the wide side of the sealing sleeve is close to the moving impeller.

[0005] As an improvement, a rotor core protective sleeve can preferably be fitted onto the rotor's drive shaft, with the narrow side of the sealing sleeve inserted into the inner wall of the rotor core protective sleeve. This improves the protection effect of the rotor core and further enhances the sealing effect of the rotor shaft.

[0006] In a further improvement, the rotor core protective sleeve may preferably include a first sleeve body and a second sleeve body, which are disposed opposite to each other at both ends of the rotor core. The sealing sleeve is inserted into the inner wall of the first sleeve body, and the second sleeve body is sandwiched between the rotor core and the commutator. This improves the protection effect of the rotor core.

[0007] Further improvements include the option of having a stepped structure on the drive shaft, with the sealing sleeve fitted onto the stepped structure. This enhances connection stability and further improves the sealing effect.

[0008] As a further improvement, the top end of the first sleeve can preferably abut against the wide edge surface of the sealing sleeve, thereby increasing the sealing effect.

[0009] As an improvement, end face grooves can preferably be distributed on the end face of the rotor core between the copper wire mounting through holes of the rotor core. The rotor core protective sleeve is radially shaped and is inserted into the end face grooves. The protective sleeve can better fix the rotor core and provide better protection.

[0010] As an improvement, the sealing sleeve can preferably be a one-piece molded elastic sleeve of corrosion-resistant rubber, offering a long service life.

[0011] As an improvement, the upper and lower ends of the stator can preferably both be provided with stator protective shells to enhance stator protection.

[0012] As an improvement, the fixed impeller can preferably be detachably connected to the end of the housing. The air outlet of the fixed impeller is located on the side wall of the fixed impeller, and a wind hood outlet is provided on the impeller cover corresponding to the air outlet. The detachable structure facilitates replacement and is easy to use. The side wall air outlet can reduce the impact of particulate matter on the impeller drive unit and extend the service life of the motor.

[0013] As an improvement, a brush mounting slot may preferably be provided on the housing, in which the brush assembly is detachably connected. This results in a more secure brush mounting.

[0014] Compared with the prior art, the advantages of this utility model are as follows: the drive shaft of the rotor passes through the through hole in the middle of the fixed impeller and is connected to the moving impeller. A sealing sleeve is fitted on the drive shaft between the rotor core and the moving impeller. The inner wall of the sealing sleeve is tightly attached to the side wall of the drive shaft. The sealing sleeve can prevent liquids, oils, hairs, particles, etc. from entering the rotor core, thus achieving a good sealing effect. The sealing sleeve is T-shaped, with its wide side close to the moving impeller, providing a larger coverage area and better blocking the aforementioned contaminants, resulting in good performance. Attached Figure Description

[0015] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0016] Figure 2 for Figure 1 A three-dimensional view from another angle;

[0017] Figure 3 yes Figure 1 Top view;

[0018] Figure 4 yes Figure 3 Cross-sectional view along line AA;

[0019] Figure 5 yes Figure 1 Exploded structural diagram;

[0020] Figure 6 yes Figure 5 A three-dimensional view of the unanalyzed rotor;

[0021] Figure 7 yes Figure 6 A cross-sectional view along the plane containing the central axis;

[0022] Figure 8 yes Figure 7 Exploded structural diagram;

[0023] Figure 9 yes Figure 8 Further structural decomposition diagram;

[0024] Figure 10 yes Figure 9 An exploded view of the rotor core that has not yet been decomposed. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] like Figures 1 to 10 As shown, the micro motor structure of this embodiment includes a housing 1, with brush assemblies symmetrically arranged on the outer side of the housing 1. A stator 3 is disposed inside the housing 1, and a rotor 4 is disposed inside the stator 3. A fixed impeller 5 is disposed on the top of the stator 3, and a moving impeller 6 is disposed on the top of the fixed impeller 5. An impeller cover 7 is disposed on the outer side of the moving impeller 6. The drive shaft 41 of the rotor 4 passes through a through hole in the middle of the fixed impeller and connects to the moving impeller 6. A sealing sleeve 8 is fitted on the drive shaft 41 between the rotor core 42 and the moving impeller 6. The inner wall of the sealing sleeve 8 is tightly attached to the side wall of the drive shaft 41. The sealing sleeve 8 is T-shaped, with its wide side close to the moving impeller 6. A cooling fan 9 can also be added to the drive shaft 41 between the sealing sleeve 8 and the moving impeller 6.

[0027] A rotor core protective sleeve is fitted onto the drive shaft 41 of the rotor 4, and the narrow side of the sealing sleeve 8 is inserted into the inner wall of the rotor core protective sleeve. The rotor core protective sleeve includes a first sleeve body 421 and a second sleeve body 422, which are arranged opposite each other at both ends of the rotor core 42. The sealing sleeve 8 is inserted into the inner wall of the first sleeve body 421, and the second sleeve body 422 is sandwiched between the rotor core 42 and the commutator 43. A stepped structure 411 is provided on the drive shaft 41, and the sealing sleeve 8 is fitted onto the stepped structure 411. The top end of the first sleeve body 421 touches the wide side surface of the sealing sleeve 8. End face grooves 424 are distributed on the end face of the rotor core 42 between the copper wire mounting through holes 423. The rotor core protective sleeve is radial and is inserted into the end face grooves 424. The sealing sleeve 8 is an elastic sleeve made of corrosion-resistant rubber in one piece. Stator 3 is provided with stator protective shells 31 at both the upper and lower ends.

[0028] The fixed impeller 5 is detachably connected to the end of the housing. The air outlet of the fixed impeller 5 is located on the side wall of the fixed impeller 5, and the impeller cover 7 corresponding to the air outlet is provided with an air cover outlet 71. A brush mounting groove 11 is provided on the housing 1, and the brush assembly 2 is detachably connected to the brush mounting groove 11.

Claims

1. A micro motor structure, comprising a housing (1), brush assemblies (2) symmetrically arranged on the outer side of the housing (1), a stator (3) disposed inside the housing (1), a rotor (4) disposed inside the stator (3), a fixed impeller (5) disposed on the top of the stator (3), a moving impeller (6) disposed on the top of the fixed impeller (5), and an impeller cover (7) disposed on the outer side of the moving impeller (6), characterized in that: The drive shaft (41) of the rotor (4) passes through the through hole in the middle of the fixed impeller and is connected to the moving impeller (6). A sealing sleeve (8) is fitted on the drive shaft (41) between the rotor core (42) and the moving impeller (6). The inner wall of the sealing sleeve (8) is tightly attached to the side wall of the drive shaft (41). The sealing sleeve (8) is T-shaped, and the wide side of the sealing sleeve (8) is close to the moving impeller (6).

2. The micro motor structure according to claim 1, characterized in that: A rotor core protective sleeve is fitted on the drive shaft (41) of the rotor (4), and the narrow side of the sealing sleeve (8) is inserted into the inner wall of the rotor core protective sleeve.

3. The micro motor structure according to claim 2, characterized in that: The rotor core protective sleeve includes a first sleeve (421) and a second sleeve (422). The first sleeve (421) and the second sleeve (422) are disposed opposite to each other at both ends of the rotor core (42). The sealing sleeve (8) is inserted into the inner wall of the first sleeve (421). The second sleeve (422) is sandwiched between the rotor core (42) and the commutator (43).

4. The micro motor structure according to claim 3, characterized in that: The drive shaft (41) is provided with a stepped structure (411), and the sealing sleeve (8) is fitted on the stepped structure (411).

5. The micro motor structure according to claim 4, characterized in that: The top end of the first sleeve (421) touches the wide side surface of the sealing sleeve (8).

6. The micro motor structure according to any one of claims 3 to 5, characterized in that: End face grooves (424) are distributed on the end face of the rotor core (42) between the copper wire mounting through holes (423). The rotor core protective sleeve is radial and is inserted into the end face grooves (424).

7. The micro motor structure according to any one of claims 1 to 5, characterized in that: The sealing sleeve (8) is an elastic sleeve made of corrosion-resistant rubber in one piece.

8. The micro motor structure according to any one of claims 1 to 5, characterized in that: The stator (3) is provided with stator protective shells (31) at both the upper and lower ends.

9. The micro motor structure according to any one of claims 1 to 5, characterized in that: The fixed impeller (5) is detachably connected to the end of the housing. The air outlet of the fixed impeller (5) is located on the side wall of the fixed impeller (5). The impeller cover (7) corresponding to the air outlet is provided with a wind cover outlet (71).

10. The micro motor structure according to any one of claims 1 to 5, characterized in that: A brush mounting groove (11) is provided on the housing (1), and the brush assembly (2) is detachably connected in the brush mounting groove (11).

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