A motor protection structure

Abstract

This application relates to a motor protection structure, which includes a fixed protective component mounted on the motor housing and a movable protective component coaxially disposed on the motor shaft. A gap is left between the fixed protective component and the motor shaft. The fixed and movable protective components are coaxially disposed and interlocked, with a gap remaining between them. Through the cooperation between the fixed and movable protective components, the length of the path required for a foreign object to move towards the gap between the shaft and the housing is increased, making it less likely for foreign objects to enter the gap between the housing and the shaft. This improves the protection against foreign objects and minimizes the impact on the normal operation of the motor.

Description

Technical Field

[0001] This application relates to the technical field of electric motors, and in particular to an electric motor protection structure. Background Technology

[0002] The structure of an electric motor typically consists of a shaft extending from the housing. The shaft can rotate relative to the housing, and the shaft and housing are connected by bearings to keep the rotation of the shaft relative to the housing stable.

[0003] Because the shaft rotates relative to the housing, there will be a certain gap between the shaft and the housing. When the motor is working, foreign objects may enter the housing through this gap. When the foreign objects come into contact with the working components inside the motor, they will affect the normal operation of the motor.

[0004] Therefore, a new technical solution is needed to address the above problems. Utility Model Content

[0005] To prevent foreign objects from easily entering the motor housing from the gap between the motor shaft and the motor housing, this application provides a motor protection structure.

[0006] This application provides a motor protection structure, which adopts the following technical solution:

[0007] A motor protection structure includes a fixed protective component installed on the motor housing and a movable protective component coaxially disposed on the motor shaft. A gap is left between the fixed protective component and the motor shaft. The fixed protective component and the movable protective component are coaxially disposed and sleeved with each other. A gap is left between the fixed protective component and the movable protective component.

[0008] By adopting the above technical solution, the cooperation between the fixed protective parts and the movable protective parts increases the length of the path that foreign objects need to travel to move toward the gap between the shaft and the housing, making it difficult for foreign objects to enter the gap between the housing and the shaft, thereby improving the protection effect against foreign objects and making the normal operation of the motor less likely to be affected.

[0009] Optional: The fixed protective component includes a fixed component fixed to the motor housing and several fixed retaining rings coaxially fixed to the fixed component; the movable protective component includes a movable component fixed to the motor shaft and several movable retaining rings coaxially fixed to the movable component; the fixed retaining rings and movable retaining rings are alternately fitted, and a gap is left between the fixed retaining rings and movable retaining rings.

[0010] By adopting the above technical solution, the cooperation between the fixed retaining ring and the movable retaining ring increases the path length of the foreign object moving toward the gap between the rotating shaft and the housing, making it difficult for the foreign object to enter the gap between the housing and the rotating shaft. At the same time, the gap between the fixed retaining ring and the movable retaining ring makes it less likely to obstruct the relative rotation between the fixed protective component and the movable protective component.

[0011] Optionally, the number of the fixing retaining rings is at least two, and the outer fixing retaining ring has a fixing notch that penetrates both end faces of the fixing retaining ring.

[0012] By adopting the above technical solution, during the relative rotation of the fixed protective component and the movable protective component, the airflow between the fixed protective component and the movable protective component is disrupted by the fixed notch, so that the air pressure between the fixed protective component and the movable protective component can be close to the external air pressure, thereby making it difficult for foreign objects to be sucked into the space between the fixed protective component and the movable protective component.

[0013] Optionally, the axial length of the retaining ring gradually increases as it approaches the rotating shaft.

[0014] By adopting the above technical solution, when the motor shaft is installed facing upwards, the fixed retaining ring near the shaft is relatively high, making it difficult for foreign objects to cross the higher fixed retaining ring and move towards the shaft. Instead, they cross the lower fixed retaining ring and move away from the shaft.

[0015] Optional: A water-spinning disc is also coaxially fixed on the motor shaft. The water-spinning disc is sleeved outside the movable protective component, and a gap is left between the water-spinning disc and the fixed component.

[0016] By adopting the above technical solution and setting up a water-spinning plate, the liquid can be thrown off after it adheres to the outer wall of the water-spinning plate. At the same time, the distance between the water-spinning plate and the fixed part is greater than the distance between the fixed retaining ring and the fixed part, making it difficult for foreign objects to enter between the fixed protective part and the movable protective part.

[0017] Optionally, the outer wall of the water-splashing plate is provided with several communicating grooves that communicate with its inner cavity.

[0018] By adopting the above technical solution, after a foreign object enters the water-spinning pan and the movable baffle ring, the foreign object can be thrown out of the inner cavity of the water-spinning pan through the connecting groove. At the same time, the connecting groove can also be used to disrupt the air flow in the water-spinning pan, slow down the air flow rate in the water-spinning pan, and make the air pressure in the water-spinning pan approximately equal to the outside air pressure, so that the foreign object is not easily sucked into the water-spinning pan.

[0019] Optionally: An extension ring is provided on the outer wall of the water-splashing plate near the fixed protective component, and the extension ring is arranged parallel to the fixed component.

[0020] By adopting the above technical solution, when the water-slinging plate rotates, it can drive the liquid to move along the extension ring in a direction away from the rotating shaft. The extension ring guides the direction of water droplet ejection, making it easier for water droplets to move away from the rotating shaft and less likely to enter between the fixed and movable protective parts.

[0021] Optional: An elastic retaining ring is also coaxially provided on the rotating shaft. The elastic retaining ring is located between the movable protective component and the water-spraying plate. The water-spraying plate can abut against the end of the elastic retaining ring away from the movable protective component.

[0022] By adopting the above technical solution, the installation position of the water-spinning plate relative to the movable protective component is limited by the elastic retaining ring, so that after the water-spinning plate is installed, it will not directly abut against the movable protective component, thereby enabling the water-spinning plate and the movable protective component to work normally.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By cooperating with the fixed and movable protective parts, the length of the path that foreign objects need to travel to move toward the gap between the shaft and the housing is increased, making it less likely for foreign objects to enter the gap between the housing and the shaft, thereby improving the protection effect against foreign objects and making the normal operation of the motor less likely to be affected.

[0025] 2. By setting up a water-spinning plate, the liquid can be thrown off after it adheres to the outer wall of the water-spinning plate. At the same time, the distance between the water-spinning plate and the fixed part is greater than the distance between the fixed retaining ring and the fixed part, making it difficult for foreign objects to enter between the fixed protective part and the movable protective part. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0027] Figure 2 for Figure 1 Enlarged view of part A;

[0028] Figure 3 This is a schematic diagram illustrating the structure of the fixed protective component in an embodiment of this application;

[0029] Figure 4 This is a schematic diagram illustrating the position of the water-spinning disc installed on the rotating shaft, as described in this embodiment of the application.

[0030] In the diagram, 1 is a fixed protective component; 11 is a fixed component; 12 is a fixed retaining ring; 121 is a fixed notch; 2 is a movable protective component; 21 is a movable component; 22 is a movable retaining ring; 3 is a water-spinning tray; 31 is a connecting groove; 32 is an extension ring; and 4 is an elastic retaining ring. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the accompanying drawings.

[0032] This application discloses a motor protection structure, such as Figure 1 and Figure 2 As shown, the device includes a fixed protective component 1 mounted on the motor housing and a movable protective component 2 coaxially mounted on the motor shaft. The fixed protective component 1 can be installed on the motor housing by riveting or other fixing methods. The fixed protective component 1 includes a disc-shaped fixing component 11 and two retaining rings 12 coaxially and integrally formed on the fixing component 11. Both the fixing component 11 and the retaining rings 12 are coaxially arranged with the rotation. The fixing component 11 is sleeved on the outside of the rotating shaft and leaves a gap between it and the rotating shaft. The two retaining rings 12 have different diameters, and the axial length of the retaining rings 12 gradually increases as they approach the rotating shaft.

[0033] The movable protective component 2 is fitted onto the outside of the rotating shaft using an interference fit, but other fixing methods can also be used. The movable protective component 2 includes a disc-shaped movable component 21 and several movable retaining rings 22 coaxially and integrally formed on the movable component 21. The movable retaining rings 22 are located at the end of the movable component 21 near the fixed protective component 1. In this embodiment, there are two movable retaining rings 22, and the two movable retaining rings 22 have different diameters. The movable retaining ring 22 located near the rotating shaft is positioned between the two fixed retaining rings 12, and the movable retaining ring 22 located away from the rotating shaft is located on the side of the fixed retaining ring 12 furthest from the rotating shaft. A gap is left between the fixed retaining ring 12 and the movable retaining ring 22. A gap is also left between the fixed component 11 and the movable retaining ring 22, and a gap is also left between the movable component 21 and the fixed retaining ring 12, so that the relative rotation between the fixed protective component 1 and the movable protective component 2 is not easily affected.

[0034] like Figure 3 As shown, when the fixed protective member 1 and the movable protective member 2 rotate relative to each other, the pressure between the fixed retaining ring 12 and the movable retaining ring 22 will be less than the external air pressure, thereby drawing dust into the space between the fixed retaining ring 12 and the movable retaining ring 22, affecting the protective effect of the fixed protective member 1 and the movable protective member 2 against foreign objects. Therefore, a fixed notch 121 is provided on the outer wall of the fixed retaining ring 12 away from the axis of rotation. The fixed notch 121 penetrates the two end faces of the fixed retaining ring 12, thereby disrupting the stability of the airflow during the rotation of the fixed retaining ring 12, making it difficult for the air pressure between the fixed protective member 1 and the movable protective member 2 to be lower than the external air pressure when they rotate, and making it difficult for foreign objects to be adsorbed between the fixed protective member 1 and the movable protective member 2.

[0035] like Figure 2 and Figure 4As shown, to further reduce the probability of foreign objects entering between the fixed protective component 1 and the movable protective component 2, a water-spinning plate 3 is coaxially installed on the rotating shaft. The water-spinning plate 3 is fixed to the rotating shaft by adhesive. The end of the water-spinning plate 3 facing the housing is open and fits over the movable protective component 2. A gap is left between the inner wall of the water-spinning plate 3 and the outer wall of the movable protective component 2. A gap is also left between the end face of the water-spinning plate 3 near the housing and the end face of the fixed component 11 away from the housing. The distance between the end of the water-spinning plate 3 near the fixed component 11 and the fixed component 11 is greater than the distance between the end of the fixed retaining ring 12 furthest from the rotating shaft and the fixed component 11.

[0036] The outer wall of the water-spinning plate 3 is provided with several circumferentially connected grooves 31 that communicate with its inner cavity. The flow of air inside the water-spinning plate 3 is disturbed by the connecting grooves 31, so that the air pressure inside the water-spinning plate 3 is not likely to be lower than the outside air pressure, thereby making it difficult for foreign objects to be sucked into the water-spinning plate 3. At the same time, during the rotation of the water-spinning plate 3, foreign objects inside the water-spinning plate 3 can also be thrown out through the connecting grooves 31, further reducing the probability of foreign objects entering between the fixed protective member 1 and the horizontal protective member.

[0037] Since the motor's shaft is upward-facing during operation, rainwater moves away from the shaft along the water-spraying disc 3 as it rotates, causing it to be splashed onto the fixed component 11. Therefore, an extension ring 32 is coaxially arranged on the outer wall of the water-spraying disc 3 near the fixed protective component 1. The extension ring 32 is parallel to the fixed component 11, and its outer diameter is larger than that of the fixed component 11. The extension ring 32 guides the path of the splashed rainwater, causing it to move away from the shaft and making it less likely for rainwater to enter between the fixed protective component 1 and the movable protective component 2.

[0038] A snap-fit ​​groove is coaxially provided on the rotating shaft, and an elastic retaining ring 4 is fitted inside the snap-fit ​​groove. The outer diameter of the elastic retaining ring 4 is larger than the diameter of the rotating shaft. The elastic retaining ring 4 is located between the movable protective part 2 and the water-spraying plate 3. The water-spraying plate 3 can abut against the end face of the elastic retaining ring 4 away from the housing, thereby limiting the gap between the water-spraying plate 3 and the movable protective part 2, so that the two can maintain a suitable distance during installation.

[0039] The implementation principle of this embodiment is as follows: After rainwater or dust and other debris fall onto the water-spinning pan 3, after the motor is started, both the water-spinning pan 3 and the movable protective component 2 rotate. The rainwater or dust falling onto the water-spinning pan 3 is detached from the water-spinning pan 3 by the centrifugal force applied by the water-spinning pan 3, while the dust and other debris falling between the water-spinning pan 3 and the movable protective component 2 are thrown away from the connecting groove 31.

[0040] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electric machine protection structure, characterized by: The device includes a fixed protective component (1) installed on the motor housing and a movable protective component (2) coaxially mounted on the motor shaft. The fixed protective component (1) has a gap with the motor shaft. The fixed protective component (1) and the movable protective component (2) are coaxially mounted and sleeved together. There is a gap between the fixed protective component (1) and the movable protective component (21). The fixed protective component (1) includes a fixed component (11) fixed on the motor housing and several fixed retaining rings (12) coaxially fixed on the fixed component (11). The movable protective component (2) includes a movable component (21) fixed on the motor shaft and several movable retaining rings (22) coaxially fixed on the movable component (21). The fixed retaining rings (12) and the movable retaining rings (22) are alternately sleeved. There is a gap between the fixed retaining rings (12) and the movable retaining rings (22).

2. An electric machine protection structure according to claim 1, characterized in that: The number of fixed retaining rings (12) is at least two, and a fixed notch (121) is provided through the outer fixed retaining ring (12), which penetrates both end faces of the fixed retaining ring (12).

3. A motor protection structure according to claim 1, wherein: The axial length of the fixed retaining ring (12) gradually increases as it approaches the rotating shaft.

4. The motor protection structure of claim 1, wherein: A water-spinning plate (3) is also coaxially fixed on the motor shaft. The water-spinning plate (3) is sleeved outside the movable protective part (2), and there is a gap between the water-spinning plate (3) and the fixed part (11).

5. A motor protection structure according to claim 4, wherein: The outer wall of the water-throwing plate (3) is provided with several communicating grooves (31) that communicate with its inner cavity.

6. A motor protection structure according to claim 4, wherein: An extension ring (32) is provided on the outer wall of the water-splashing plate (3) near the fixed protective member (1), and the extension ring (32) is arranged parallel to the fixed member (11).

7. The motor protection structure according to claim 4, characterized in that: An elastic retaining ring (4) is also coaxially arranged on the rotating shaft. The elastic retaining ring (4) is located between the movable protective part (2) and the water-spraying plate (3). The water-spraying plate (3) can abut against the end of the elastic retaining ring (4) away from the movable protective part (2).

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