A sealing structure of an end portion of an electric machine housing

Abstract

A kind of sealing structure of motor shell end, including wind cover, moving vane, setting in shell end fixed vane, wind cover is connected on the outer wall of fixed vane, moving vane is set in the suction cavity surrounded by fixed vane and wind cover, annular limiting slot is set on the inner wall of wind cover corresponding to wind cover air inlet, the top of moving vane is provided with annular protrusion that can block particulate matter, annular protrusion is inserted in limiting slot, the distance between the top of annular protrusion and the bottom surface of limiting slot is less than 2mm.The utility model has the advantages that: the suction cavity is divided into intake chamber and pass gas cavity, and only very narrow channel is connected between intake chamber and pass gas cavity, airflow and water flow can pass through but can effectively prevent particulate matter, especially large volume garbage, so as to achieve good sealing effect, prolong the service life of motor.

Description

Technical Field

[0001] This utility model relates to the field of vacuum cleaner motor technology, and in particular to a sealing structure at the end of a motor housing. Background Technology

[0002] A Chinese utility model patent with application number CN202421644696.7 entitled "A Dry and Wet Dual-Use Brushless Motor" discloses a dry and wet dual-use brushless motor, including an outer fan cover, an inner fan cover, a moving impeller, an oil seal, a housing, a bracket, a rotor assembly, a stator assembly, and a positioning cover; the outer fan cover is located at one end of the housing, the inner fan cover is located on one side of the outer fan cover, the moving impeller is located inside the inner fan cover and connected to the motor main shaft, the oil seal is located on one side of the rotor assembly, the stator assembly is located around the rotor assembly, the positioning cover is located on the other side of the housing, and the bracket is located inside the housing and fixedly connected to the housing. This utility model provides a dual-purpose brushless motor for both wet and dry applications. It uses two airflow channels—a wet air duct and a dry air duct—to expel hot air from inside the motor and moisture drawn in by the impeller, respectively. The negative pressure at the vent of the outer fan shroud draws out the dry, hot air from inside the motor. Simultaneously, the lower air pressure inside the motor compared to the casing allows moisture to escape through the wet air duct, preventing moisture buildup inside the casing and extending the motor's lifespan. However, the sealing effect at the impeller's suction chamber can be improved, therefore the motor's structure requires further refinement. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a sealing structure at the end of a motor housing that can prevent large particles and has a good sealing effect, 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: the sealing structure at the end of the motor housing includes a fan shroud, a moving impeller, and a fixed impeller disposed at the end of the housing. The fan shroud is connected to the outer wall of the fixed impeller, and the moving impeller is disposed in the air intake chamber formed by the fixed impeller and the fan shroud. The characteristic is that an annular limiting groove is provided on the inner wall of the fan shroud corresponding to the air inlet of the fan shroud, and an annular protrusion that can block particulate matter is provided on the top of the moving impeller. The annular protrusion extends into the limiting groove, and the distance between the top of the annular protrusion and the bottom surface of the limiting groove is less than 2mm.

[0005] As an improvement, the limiting groove can preferably be a V-shaped groove with a narrower width near the air inlet of the hood and a wider width away from the air inlet of the hood. This structure can reduce the difficulty of processing. At the same time, the gap between the top of the annular protrusion and the bottom of the limiting groove is smaller, which can better prevent large particles from entering the air intake chamber.

[0006] Further improvements include, preferably, a distance of less than 2mm between the top edge of the inner wall of the annular protrusion and the inner wall of the limiting groove, thereby further enhancing the sealing effect.

[0007] As an improvement, the thickness of the annular protrusion is preferably less than the thickness of the top of the impeller. This allows for better alignment with the narrowing position of the limiting groove, improving the sealing effect.

[0008] As an improvement, the fixed impeller can preferably be detachably connected to the end of the housing, and an annular baffle is provided on the outer wall of the fixed impeller to guide the airflow. This protects the housing and the air outlet of the fixed impeller, while also guiding the airflow, resulting in good performance.

[0009] In a further improvement, a sealing protrusion is preferably provided at the end of the housing, and a through hole is provided in the middle of the fixed impeller. The fixed impeller is sleeved on the sealing protrusion, and a sealing ring connecting groove is provided on the top surface of the sealing protrusion for embedding a sealing ring. The drive shaft of the moving impeller drive unit passes through the sealing protrusion and the sealing ring and is connected to the moving impeller. The sealing ring enhances the sealing effect at the end of the housing, providing good waterproof and oil-proof performance.

[0010] As a further improvement, the gap between the sealing ring and the sealing ring connecting groove can preferably be filled with sealing oil. This further improves the waterproof effect at the end of the housing and extends the service life of the motor drive components.

[0011] In a further improvement, the impeller drive unit preferably includes a stator and a rotor. The stator is connected to the inner wall of the housing and is connected to a power supply terminal via a circuit. The rotor passes through the stator, and the rotor's drive shaft passes through the stator and the housing and is connected to the impeller. This design results in a compact structure and a small space occupied by the drive components.

[0012] In a further improvement, a sealing cover can preferably be provided on the opening of the housing. The stator is connected to the inner cavity of the housing formed by the housing and the sealing cover. One end of the drive shaft is connected to the housing via an upper bearing, and the other end of the drive shaft is connected to the sealing cover via a lower bearing. The control circuit board is connected to the sealing cover, and the stator is connected to the control circuit board via wires. The structure is compact, and the drive components occupy little space.

[0013] As a further improvement, the bottom of the housing can preferably be provided with a waterproof cover, the waterproof cover having a through hole in the middle for a wire to pass through, and the sealing cap located in the inner cavity formed by the waterproof cover and the housing. This increases the waterproof performance of the bottom of the housing.

[0014] Compared with the prior art, the advantages of this utility model are as follows: an annular limiting groove is provided on the inner wall of the wind hood corresponding to the air inlet of the wind hood, and an annular protrusion that can block particulate matter is provided on the top of the impeller. The annular protrusion extends into the limiting groove, and the distance between the top of the annular protrusion and the bottom surface of the limiting groove is less than 2mm. This structure divides the air intake chamber into an air intake chamber and an air passage chamber, and the air intake chamber and the air passage chamber are connected by only a very narrow channel. Airflow and water flow can pass through, which can effectively prevent particulate matter, especially large-volume garbage, from passing through, thereby achieving a good sealing effect and extending the service life of the motor. 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 Top view;

[0017] Figure 3 yes Figure 2 Cross-sectional view along line AA;

[0018] Figure 4 yes Figure 1 Exploded structural diagram;

[0019] Figure 5 yes Figure 4 A cross-sectional view of the stroke hood along the plane containing the central axis;

[0020] Figure 6 yes Figure 4 Further structural decomposition diagram;

[0021] Figure 7 yes Figure 6 An exploded view of the still-undisassembled moving impeller drive section;

[0022] Figure 8 yes Figure 3 Enlarged view of section I. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] like Figures 1 to 8As shown, the sealing structure at the end of the motor housing in this embodiment includes a fan shroud 3, a moving impeller 4, and a fixed impeller 2 disposed at the end of the housing. The fan shroud 3 is connected to the outer wall of the fixed impeller 2. The moving impeller 4 is disposed in the air intake chamber formed by the fixed impeller 2 and the fan shroud 3. An annular limiting groove 31 is provided on the inner wall of the fan shroud corresponding to the air inlet. An annular protrusion 41 that can block particulate matter is provided on the top of the moving impeller 4. The annular protrusion 41 extends into the limiting groove 31, and the distance S1 between the top of the annular protrusion and the bottom surface of the limiting groove is less than 2mm. The moving impeller divides the air intake chamber into an air inlet chamber 32 and an air outlet chamber 33, which are connected by only a very narrow channel. Large particles cannot enter the air outlet chamber 33 from the air inlet chamber 32, thus achieving a good sealing effect.

[0025] The limiting groove 31 is a V-shaped groove with a narrower width near the air inlet of the shroud and a wider width further away from the air inlet. The distance S2 between the top edge of the inner wall of the annular protrusion and the inner wall of the limiting groove is less than 2mm. The thickness T1 of the annular protrusion is less than the thickness T2 of the top of the impeller.

[0026] The fixed impeller 2 is detachably connected to the end of the housing 1, and an annular baffle 21 for guiding airflow is provided on the outer wall of the fixed impeller 2. A sealing protrusion 11 is provided at the end of the housing 1, and a through hole is provided in the middle of the fixed impeller 2. The fixed impeller 2 is fitted onto the sealing protrusion 11, and a sealing ring connecting groove 12 for embedding a sealing ring 5 is provided on the top surface of the sealing protrusion 11. The drive shaft 61 of the moving impeller drive unit passes through the sealing protrusion 11 and the sealing ring 5 and is connected to the moving impeller 4. The gap between the sealing ring 5 and the sealing ring connecting groove 12 is filled with sealing oil.

[0027] The impeller drive unit includes a stator 7 and a rotor 6. The stator 7 is connected to the inner wall of the housing 1 and is connected to a power supply terminal via wiring. The rotor 6 is housed within the stator 7, and its drive shaft 61 passes through the stator 7 and the housing 1 to connect to the impeller 4. A sealing cover 8 is provided on the opening of the housing 1. The stator 7 is connected to the inner cavity of the housing formed by the housing 1 and the sealing cover 8. One end of the drive shaft 61 is connected to the housing 1 via an upper bearing, and the other end is connected to the sealing cover 8 via a lower bearing. A control circuit board is connected to the sealing cover 8, and the stator 7 is connected to the control circuit board via wires. A waterproof cover 9 is provided at the bottom of the housing 1, and a waterproof cover through hole for wires to pass through is provided in the middle of the waterproof cover 9. The sealing cover 8 is located in the inner cavity formed by the waterproof cover 9 and the housing 1.

Claims

1. A sealing structure at the end of a motor housing, comprising a fan shroud (3), a moving impeller (4), and a fixed impeller (2) disposed at the end of the housing, wherein the fan shroud (3) is connected to the outer wall of the fixed impeller (2), and the moving impeller (4) is disposed in an air intake chamber formed by the fixed impeller (2) and the fan shroud (3), characterized in that: An annular limiting groove (31) is provided on the inner wall of the wind hood corresponding to the air inlet of the wind hood. The top of the moving impeller (4) is provided with an annular protrusion (41) that can block particulate matter. The annular protrusion (41) extends into the limiting groove (31). The distance (S1) between the top of the annular protrusion and the bottom surface of the limiting groove is less than 2mm.

2. The sealing structure according to claim 1, characterized in that: The limiting groove (31) is a V-shaped groove with a smaller width near the air inlet of the hood and a larger width away from the air inlet of the hood.

3. The sealing structure according to claim 2, characterized in that: The distance (S2) between the top edge of the inner wall of the annular protrusion and the inner wall of the limiting groove is less than 2mm.

4. The sealing structure according to any one of claims 1 to 3, characterized in that: The thickness (T1) of the annular protrusion is less than the thickness (T2) of the top of the moving impeller.

5. The sealing structure according to any one of claims 1 to 3, characterized in that: The fixed impeller (2) is detachably connected to the end of the housing (1), and an annular baffle (21) for guiding the airflow is provided on the outer wall of the fixed impeller (2).

6. The sealing structure according to claim 5, characterized in that: A sealing protrusion (11) is provided at the end of the housing (1), and a through hole is provided in the middle of the fixed impeller (2). The fixed impeller (2) is sleeved on the sealing protrusion (11). A sealing ring connecting groove (12) that can be embedded in the sealing ring (5) is provided on the top surface of the sealing protrusion (11). The drive shaft (61) of the moving impeller drive unit passes through the sealing protrusion (11) and the sealing ring (5) and is connected to the moving impeller (4).

7. The sealing structure according to claim 6, characterized in that: The gap between the sealing ring (5) and the sealing ring connecting groove (12) is filled with sealing oil.

8. The sealing structure according to claim 7, characterized in that: The impeller drive unit includes a stator (7) and a rotor (6). The stator (7) is connected to the inner wall of the housing (1). The stator (7) is connected to a power supply terminal that can be connected to the power supply through a line. The rotor (6) is inserted in the stator (7). The drive shaft (61) of the rotor (6) passes through the stator (7) and the housing (1) and is connected to the impeller (4).

9. The sealing structure according to claim 8, characterized in that: A sealing cover (8) is provided on the opening of the housing (1). The stator (7) is connected in the inner cavity of the housing (1) and the sealing cover (8). One end of the drive shaft (61) is connected to the housing (1) through the upper bearing, and the other end of the drive shaft (61) is connected to the sealing cover (8) through the lower bearing. The control circuit board is connected to the sealing cover (8). The stator (7) is connected to the control circuit board through wires.

10. The sealing structure according to claim 9, characterized in that: The bottom of the housing (1) is provided with a waterproof cover (9), and the middle part of the waterproof cover (9) is provided with a waterproof cover through hole that allows wires to pass through. The sealing cover (8) is located in the inner cavity formed by the waterproof cover (9) and the housing (1).

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