A plastic-coated housing structure for a wet and dry vacuum cleaner motor

Abstract

This utility model discloses a plastic-coated housing structure for a wet / dry dual-purpose vacuum cleaner motor, including a housing, a motor bracket connected to the lower end of the housing, a rotating shaft inside the motor bracket, a lower housing located at the lower end of the motor bracket away from the housing, a circuit board and connecting wiring harness inside the lower housing, a fan shroud at the upper end of the housing, and a fixed impeller and an oil seal in the middle of the housing located between the fan shroud and the housing. The beneficial effects of this utility model are: compared to injection-molded parts, plastic-coated aluminum parts have significantly higher mechanical strength and better thermal conductivity, making them suitable for scenarios with higher requirements for strength, heat dissipation, and dimensional stability; compared to pure aluminum parts, plastic-coated aluminum parts have lower costs due to the partial use of plastic materials and stronger corrosion resistance; plastic-coated aluminum parts can achieve a greater range of fundamental frequency adjustment through a large percentage change in material, and the plastic layer can absorb vibration, effectively improving motor resonance noise problems with minimal changes to the existing motor structure.

Description

Technical Field

[0001] This utility model relates to the field of motor housing processing technology, specifically to a plastic-coated housing structure for a dry and wet dual-purpose vacuum cleaner motor. Background Technology

[0002] The housing of a dry / wet brushless motor is usually made of cast aluminum and machined to meet the assembly accuracy requirements. However, the machining cost is relatively high. In order to ensure the corrosion resistance requirements of the water motor, the cast aluminum housing usually needs to undergo additional processes such as anodizing and electrophoresis. However, it is still prone to pitting corrosion in humid and salt spray environments. Although the all-cast aluminum parts have high rigidity and strength, they have weak vibration absorption capacity and are prone to resonance noise and other problems. In addition, even if the blades of the cast aluminum parts are shot blasted, burrs are very easy to be generated, which will affect the air duct performance and reduce product efficiency.

[0003] The existing problems with the housing technology are as follows: 1. All-aluminum parts are expensive and prone to functional defects such as sand holes and shrinkage cavities. They do not meet the requirements of water-cooled machines in environments with high requirements for humidity and salt spray, and usually require additional anti-corrosion processes; 2. Dry and wet dual-purpose motors have the need to be used in both high and low frequency ranges, but the large frequency range can easily lead to resonance frequencies and noise problems; 3. Existing housings use cast aluminum parts. Even with shot blasting and other precision machining processes, blade notches and burrs can still occur under limited cost, which will significantly affect the efficiency deviation of machining and mass production. Utility Model Content

[0004] The purpose of this utility model is to provide a plastic-coated housing structure for a dry and wet dual-purpose vacuum cleaner motor to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a plastic-coated housing structure for a wet and dry dual-purpose vacuum cleaner motor, comprising a housing, a motor bracket connected to the lower end of the housing, a rotating shaft inside the motor bracket, a lower housing located at the lower end of the motor bracket away from the housing, a circuit board and a connecting wire harness inside the lower housing, a fan shroud at the upper end of the housing, a fixed impeller and an oil seal in the middle of the housing located between the fan shroud and the housing.

[0006] As a further optimization, a sealing ring is provided at the connection between the motor bracket and the lower housing.

[0007] In a further optimization, the middle part of the end face of the housing is an oil seal mating surface.

[0008] In a further optimized configuration, a bearing chamber is provided at the lower end of the oil seal mating surface, and a blade is provided on the outer side of the bearing chamber, wherein the blade is made of injection molded material.

[0009] Furthermore, both the housing and the blades are made of aluminum, and both have an injection-molded overlay structure.

[0010] In a further optimized configuration, the end face of the housing is fixedly connected to the motor bracket by multiple bolts. Beneficial effects

[0011] The plastic-coated housing structure of the wet and dry vacuum cleaner motor provided by this utility model allows for the achievement of the same precision at a lower cost, and even outperforms cast aluminum parts on non-machined surfaces. Furthermore, various materials such as PPS (with a long-term operating temperature of 200~240℃) can ensure the internal temperature of most motors on current platforms. Compared to pure injection molded parts, plastic-coated aluminum parts have significantly higher mechanical strength and better thermal conductivity, making them suitable for scenarios with higher requirements for strength, heat dissipation, and dimensional stability. A greater range of adjustments can be achieved through a large percentage change in material. The fundamental frequency is adjusted, and the plastic layer can absorb vibration, which can effectively improve the motor resonance noise problem with minimal changes to the existing motor structure. In actual production, it was found that the casing, especially the edge of the casing blade, is prone to defects and burrs when the aluminum parts are cast. The later fine polishing process can improve this to some extent, but it still cannot completely solve the problem. Therefore, the resulting efficiency reduction cannot be adjusted by other methods. However, this situation almost does not occur in injection molded blades. The problem can be completely solved by plastic-coated blades. In addition, plastic-coated aluminum parts can better meet the product's lightweight requirements. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the casing structure of this utility model; Figure 3 This is a schematic diagram of the overall structure of the casing of this utility model. Detailed Implementation

[0013] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example

[0014] like Figure 1-3 As shown, a plastic-coated housing structure for a wet and dry vacuum cleaner motor includes a housing 14. A motor bracket 2 connected to the lower end of the housing 14 is provided. A rotating shaft 6 is provided inside the motor bracket 2. A lower housing 8 is provided at the lower end of the motor bracket 2 away from the housing 14. A circuit board 10 and a wiring harness 9 connected to it are provided inside the lower housing 8. A fan shroud 1 is provided at the upper end of the housing 14. A fixed impeller 5 and an oil seal 4 in the middle of the housing 14 are provided between the fan shroud 1 and the housing 14.

[0015] In this embodiment, a sealing ring 7 is provided at the connection between the motor bracket 2 and the lower housing 8.

[0016] The middle part of the end face of the housing 14 is the oil seal mating surface 12.

[0017] The lower end of the oil seal mating surface 12 is provided with a bearing chamber 13, and the outer side of the bearing chamber 13 is provided with a blade 11, which is made of injection molded material.

[0018] Both the housing 14 and the blades 11 are made of aluminum, and both are injection-molded structures.

[0019] The end face of the housing 14 is fixedly connected to the motor bracket 2 by multiple bolts.

[0020] Injection-molded parts can achieve the same precision at a lower cost, and even outperform cast aluminum parts on non-machined surfaces. Furthermore, various materials such as PPS (long-term operating temperature of 200~240℃) can guarantee the internal temperature of most motors on the current platform, which is feasible. Compared to pure injection molded parts, plastic-coated aluminum parts have significantly higher mechanical strength and better thermal conductivity, making them suitable for scenarios with higher requirements for strength, heat dissipation, and dimensional stability. By changing the material by a large percentage, a greater range of fundamental frequency regulation can be achieved. At the same time, the plastic layer can absorb vibration, effectively improving the motor resonance noise problem with minimal changes to the existing motor structure. In actual production, it was found that the casing, especially the edges of the blades, is prone to defects and burrs when the aluminum parts are cast. While fine polishing can improve these issues to some extent, it cannot completely eliminate them. Therefore, the resulting reduction in efficiency cannot be adjusted by other methods. However, this problem almost never occurs in injection-molded blades. Plastic-coated blades can completely solve this problem. In addition, plastic-coated aluminum parts can better meet the requirements for product lightweighting.

[0021] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A plastic-coated housing structure for a wet / dry dual-purpose vacuum cleaner motor, characterized in that: Includes a housing (14), with a motor bracket (2) connected to the lower end of the housing (14), a rotating shaft (6) inside the motor bracket (2), a lower housing (8) at the lower end of the motor bracket (2) away from the housing (14), a circuit board (10) and a wiring harness (9) connected to it inside the lower housing (8), a fan shroud (1) at the upper end of the housing (14), a fixed impeller (5) and an oil seal (4) in the middle of the housing (14) are provided between the fan shroud (1) and the housing (14).

2. The plastic encapsulated motor housing structure for a wet / dry vacuum cleaner of claim 1, wherein: A sealing ring (7) is provided at the connection between the motor bracket (2) and the lower housing (8).

3. The plastic encapsulated motor housing structure for a wet / dry vacuum cleaner of claim 1, wherein: The middle part of the end face of the housing (14) is the oil seal mating surface (12).

4. The plastic encapsulated motor housing structure of claim 3, wherein: The lower end of the oil seal mating surface (12) is provided with a bearing chamber (13), and the outer side of the bearing chamber (13) is provided with a blade (11), and the blade (11) is made of injection molded material.

5. The plastic encapsulated motor housing structure of claim 4, wherein: Both the housing (14) and the blade (11) are made of aluminum and are injection-molded structures.

6. The plastic encapsulated motor housing structure for wet and dry vacuum cleaning according to claim 1, wherein: The end face of the housing (14) is fixedly connected to the motor bracket (2) by multiple bolts.

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