Bushing and pool automatic cleaning device

Abstract

The application provides a shaft sleeve and a pool automatic cleaning device, the shaft sleeve is used for an electric device, the electric device comprises a motor and a bearing, the shaft sleeve is sleeved on a rotating shaft of the motor, a foreign matter prevention gap is formed between the shaft sleeve and the rotating shaft of the motor, and the shaft sleeve is in interference fit with an inner ring of the bearing; a winding prevention structure is arranged on the outer side of the shaft sleeve, and the winding prevention structure is used for preventing foreign matter from winding.

Description

Technical Field

[0001] This utility model relates to the field of cleaning equipment technology, specifically to an automatic cleaning device for a bushing and a water tank. Background Technology

[0002] When cleaning a swimming pool, an automatic pool cleaning device typically uses a motor to drive an impeller to rotate at high speed, which in turn drives water to flow through a filtration device to clean the pool water. It also drives water to be sprayed out at high speed from inside the automatic pool cleaning device to propel the device forward.

[0003] Currently, in existing automatic water tank cleaning devices, the bearings are directly mounted on the motor shaft. During operation, the motor shaft and / or bearings are easily entangled by foreign objects such as hair and fibers in the pool water. These foreign objects increase the frictional resistance of the bearings and the rotational resistance of the motor shaft, reducing the motor's working efficiency. Furthermore, long-term entanglement of foreign objects can lead to a decrease in the bearing's sealing performance, resulting in water leakage or motor damage. Utility Model Content

[0004] To address the shortcomings of the prior art, this application provides a bushing for an electric device, the electric device including a motor and a bearing, the bushing being sleeved on the rotating shaft of the motor, a foreign object prevention gap being formed between the bushing and the rotating shaft of the motor, and the bushing being interference-fitted with the inner ring of the bearing.

[0005] The bushing has an anti-winding structure on its outer side, which is used to prevent foreign objects from getting entangled.

[0006] Furthermore, the anti-winding structure includes a hole-type structure, a groove-type structure, a rib structure, a spiral flow guiding structure, a lubricating coating structure, or a sawtooth cutting structure.

[0007] Furthermore, when the anti-winding structure includes a groove-shaped structure, the groove-shaped structure includes an annular groove, a spiral groove, a straight groove, or a grid groove.

[0008] Furthermore, when the groove structure is a spiral groove, the groove depth of the spiral groove is 0.1mm to 2mm; and / or, the inclination angle of the spiral groove is 10° to 40°; and / or, the distance between two adjacent grooves in the spiral groove along the axial direction of the bushing is 1mm to 8mm.

[0009] Furthermore, the bushing includes a first segment and a second segment connected to the first segment, the second segment having an interference fit with the inner ring of the bearing, and the anti-winding structure being disposed on the surface of the first segment opposite to the rotating shaft.

[0010] Furthermore, the end of the second segment opposite to the first segment extends radially to form a retaining ring, which abuts against the inner ring of the bearing.

[0011] Furthermore, the inner diameter of the second segment is larger than the inner diameter of the first segment.

[0012] Furthermore, the second section is also equipped with an oil seal for sealing the lubricating oil.

[0013] Furthermore, a sealing ring is fitted on the outer side of the second section, the sealing ring being used to seal the connection between the bushing and the bearing;

[0014] Alternatively, the bushing may be made of copper.

[0015] Another aspect of this application provides an automatic water tank cleaning device, including a motor, a bearing, an impeller, and a bushing as described above. The bushing is sleeved on the rotating shaft of the motor, and a foreign object prevention gap is formed between the bushing and the rotating shaft of the motor. The bushing is interference-fitted with the inner ring of the bearing, and the impeller is fixed to the rotating shaft of the motor.

[0016] The embodiments described in this application have the following beneficial effects:

[0017] The bushing of this invention is located between the bearing and the motor shaft. By setting an anti-winding structure on the outside of the bushing, the probability of the motor shaft being entangled by foreign objects is reduced. In addition, by forming an anti-foreign object gap between the bushing and the motor shaft, the normal operation of the motor shaft can be maintained on the one hand, and foreign objects can be prevented from entering through the gap between the bushing and the motor shaft on the other hand, thereby improving the working efficiency and service life of the motor. Furthermore, since the bushing and the bearing are interference-fitted, foreign objects cannot enter the gap between the bushing and the bearing. Therefore, this bushing has the function of preventing the motor shaft from being entangled by foreign objects, and it has a simple structure, is easy to install, and has a low manufacturing cost. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. The accompanying drawings in the following description are merely exemplary embodiments of this disclosure.

[0019] Figure 1 This is a three-dimensional structural diagram of a bushing according to this application; and

[0020] Figure 2 This is a cross-sectional structural diagram of a bushing connected to a motor device according to this application; and

[0021] Figure 3 This is a side view of a bushing structure according to this application; and

[0022] Figure 4 This is a top view of a bushing structure according to this application.

[0023] In the diagram: 10, bushing; 110, first section; 111, anti-winding structure; 120, second section; 121, retaining ring; 122, hot-pressed fixing hole; 123, sealing groove; 200, electric actuator; 210, motor; 211, rotating shaft; 220, bearing. Detailed Implementation

[0024] The embodiments of this disclosure will now be described with reference to the accompanying drawings. The described embodiments are merely some, not all, of the embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the protection scope of this application. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0025] First, refer to Figure 1 and Figure 2 The bushing 10 provided in this application is described by way of example. The bushing 10 is used in an electric device 200, which includes a motor 210 and a bearing 220. The bushing 10 is sleeved on the rotating shaft 211 of the motor 210, wherein a foreign object prevention gap is formed between the bushing 10 and the rotating shaft 211 of the motor 210, and the bushing 10 is interference-fitted with the inner ring of the bearing 220; an anti-winding structure 111 is provided on the outer side of the bushing 10, which is used to prevent foreign objects from winding around.

[0026] The bushing 10 may be cylindrical, for example. The bushing 10 may be fitted onto the rotating shaft 211, and the length of the bushing 10 extends along the length direction of the rotating shaft 211. The bushing 10 may be made of materials such as metal or plastic.

[0027] The electric device 200 can be a device that uses an electric motor as a power source to convert electrical energy into mechanical energy. The electric device 200 may include a motor 210 and a bearing 220. The motor 210 can convert electrical energy into mechanical energy, and may include a DC motor, an AC motor, a stepper motor, a servo motor, etc. It is understood that the type of motor 210 in this application is merely exemplary, and any type that can implement the technical principles of this application is acceptable; no specific limitation is made here.

[0028] The bearing 220 can be disposed outside the bushing 10, and the inner ring of the bearing 220 contacts the bushing 10. The bearing 220 can be a stainless steel deep groove ball bearing, a ceramic hybrid bearing, a sealed stainless steel bearing, etc.

[0029] A foreign object prevention gap is formed between the bushing 10 and the rotating shaft 211 of the motor 210. This gap is annular and located between the inner wall of the bushing 10 and the outer wall of the rotating shaft 211. Foreign objects cannot enter or enter the gap in a minimal manner. The size of the gap is designed according to specific application requirements, for example, between 8 micrometers and 1 millimeter. The gap should not be too small or too large. When preventing foreign objects of different sizes, the width of the gap can be designed as needed. For example, when the foreign object is mainly a hair, the width of the gap can be designed to be smaller than the width of a hair, as long as it prevents foreign objects from entering the gap between the bushing 10 and the rotating shaft 211 of the motor 210.

[0030] The bushing 10 and the inner ring of the bearing 220 are interference-fitted. The term "interference fit" refers to a tight connection and high-precision fit between the bushing 10 and the inner ring of the bearing 220, with an interference amount, for example, between 0.01mm and 0.1mm. The specific value can be selected according to application requirements. An interference fit can be achieved by heating the bushing 10 or cooling the inner ring of the bearing 220, causing a change in its dimensions. Alternatively, an interference fit can be achieved by cooling the bushing 10 or heating the inner ring of the bearing 220. The interference fit between the bushing 10 and the inner ring of the bearing 220 ensures that the load is evenly distributed on the inner ring of the bearing 220, reducing localized stress concentration and extending the service life of the bearing 220. The interference fit between the bushing 10 and the inner ring of the bearing 220 increases the contact area between them, improving the load-bearing capacity of the automatic water tank cleaning device. The interference fit between the bushing 10 and the inner ring of the bearing 220 can reduce the relative movement between the bushing 10 and the inner ring of the bearing 220, thereby reducing the vibration and offset of the bushing 10 and the noise generated by the bushing 10.

[0031] The outer ring of bearing 220 is fixed to electric actuator 200. The rolling elements (such as balls or rollers) of bearing 220 can be disposed between the inner and outer rings of bearing 220. The retaining ring 121 of bushing 10 abuts against the inner ring of bearing 220. The functions of bearing 220 and retaining ring 121 are not explained in detail here; specific details can be found below.

[0032] like Figure 1 and Figure 2As shown, the bushing 10 is disposed between the bearing 220 and the motor shaft 211. An anti-winding structure 111 is provided on the outer side of the bushing 10. By providing the anti-winding structure 111 on the outer side of the bushing 10, the probability of the motor shaft 211 being entangled by foreign objects is reduced. Furthermore, by forming an anti-foreign object gap between the bushing 10 and the motor shaft 211, the normal operation of the motor shaft 211 can be maintained, and foreign objects can be prevented from entering through the gap between the bushing 10 and the motor shaft 211, thus improving the working efficiency and service life of the motor. Also, because the bushing and bearing are interference-fitted, foreign objects cannot enter the gap between the bushing and the bearing; therefore, the bushing has the function of preventing foreign object entanglement. It can be understood that the anti-winding structure 111 can prevent foreign objects (such as hair, fibers, small particles, etc.) from becoming entangled on the surface of the bushing 10 or entering the interior of the bushing 10. For example, the anti-winding structure 111 may have protrusions or ribs on the outer surface of the bushing 10. These structures can reduce the adhesion of foreign objects and increase the difficulty for foreign objects to adhere to the surface of the bushing 10. The anti-winding structure 111 will be further explained below with specific examples.

[0033] The anti-winding structure 111 includes a hole structure, a groove structure, a rib structure, a spiral flow guiding structure, a lubricating coating structure, or a sawtooth cutting structure.

[0034] The anti-winding structure 111 can include, for example, the following specific forms: hole-type structure, groove-type structure, rib structure, spiral guide structure, lubricating coating structure, and serrated cutting structure. Specifically, the hole-type structure can be a design of multiple small holes on the surface of the bushing 10. These small holes can be circular, square, or other shapes, and are regularly arranged on the surface of the bushing 10. When foreign objects adhere to the surface of the bushing 10, the presence of these small holes reduces the contact area between the foreign object and the surface of the bushing 10, thereby reducing the adhesion force between the foreign object and the surface of the bushing 10, making it easier for the foreign object to be removed or detached from the surface of the bushing 10, and preventing the accumulation of foreign objects on the surface of the bushing 10. The diameter of these small holes needs to be larger than the size of common foreign objects (e.g., the diameter of a hair is 0.023 mm to 0.1 mm, and the designed hole diameter is ≥0.5 mm). The edges of the small holes can be rounded (0.13 mm to 0.3 mm) to prevent secondary winding of foreign objects.

[0035] The groove structure is typically a long, narrow, recessed structure with a cross-section usually rectangular, U-shaped, V-shaped, or trapezoidal. The groove structure reduces the contact area between foreign objects and the surface of the bushing 10, thus reducing adhesion and making it easier to remove or detach the foreign objects. It also guides the foreign objects along the groove's extension direction, reducing point-to-point adhesion. Specifically, the groove structure includes annular grooves, spiral grooves, wavy grooves, straight grooves, or grid grooves. An annular groove can be a groove formed along the circumference of the bushing 10, and its shape can be circular or nearly circular, for example, encircling the bushing 10 once or several times. The depth and width of the annular groove can be designed according to actual needs; for example, a shallower depth and moderate width can ensure the groove's strength and guiding function. When water flows along the extension direction of the annular groove, foreign objects (such as hair, fibers, impurities, etc.) can be guided and discharged along the groove's direction, preventing accumulation on the bushing 10 surface. Due to the guiding effect of the annular groove, foreign objects are difficult to form a stable winding state on the surface of the bushing 10, thus effectively reducing the occurrence of winding phenomenon.

[0036] A spiral groove can generally be understood as a groove extending spirally along the axis of the bushing 10 on the outside of the bushing 10. The pitch of the spiral groove (the distance between two adjacent spiral groove turns) can be adjusted as needed; for example, a larger pitch can better guide foreign objects out. The depth and width of the spiral groove are also designed according to actual needs; for example, a moderate depth and a narrow width can ensure the strength and guiding function of the spiral groove. Considering that the water flow will spiral when agitated by the blades installed on the motor shaft, the shape of the spiral groove can guide foreign objects to slide out of the surface of the bushing 10 along the direction of water flow and the extension direction of the spiral groove, efficiently discharging the foreign objects.

[0037] The straight groove can be a groove that is linearly distributed along the axial or radial direction of the bushing 10, and its shape is straight. The length, width, and depth of the straight groove can be designed according to actual needs. For example, the straight groove can be longer, narrower, and of moderate depth to ensure its strength and guiding function. The straight groove can guide foreign objects to a specific area of ​​the bushing 10, so that the foreign objects can be detached from the bushing under the action of water flow. Due to the guiding effect of the straight groove, foreign objects are unlikely to form a stable entanglement on the surface of the bushing 10, thereby effectively reducing the occurrence of entanglement.

[0038] The grid groove can include crisscrossing groove lines to form a grid-like structure. The spacing, width, and depth of the straight grooves can be designed according to actual needs. For example, the grid grooves can have moderate spacing, narrow width, and moderate depth to ensure the strength and guiding function of the grooves. The structure of the grid groove can divide the surface of the bushing 10 into multiple small areas, making it difficult for foreign objects to form a large-area entanglement on the surface of the bushing 10 after entering the grid groove, thereby effectively reducing the occurrence of entanglement.

[0039] It should be noted that the above description of the types of groove structures is merely exemplary. The types of groove structures protected by this application are not limited to those listed above. Those skilled in the art can adjust the groove structure according to the actual situation, as long as the technical principles of this application can be achieved.

[0040] When the groove structure is a spiral groove, the groove depth of the spiral groove is, for example, 0.1 mm to 2 mm; and / or, the inclination angle of the spiral groove is 10° to 40°; and / or, the distance between two adjacent grooves in the spiral groove along the axial direction of the bushing 10 is, for example, 1 mm to 8 mm.

[0041] For example, the depth of the spiral groove can be 0.1mm, 0.5mm, 1mm, or 2mm. The depth can also be any value within the range of 0.1mm to 2mm, without specific limitation. When the depth of the spiral groove is within the range of 0.1mm to 2mm, it can reduce the stability of foreign objects adhering to the surface of the bushing while maintaining the strength of the bushing, and effectively guide foreign objects to quickly detach from the bushing. The inclination angle of the spiral groove can be 10°, 20°, 30°, or 40°. The inclination angle can also be any value within the range of 10° to 40°, without specific limitation. When the inclination angle of the spiral groove is within the range of 10° to 40°, when the impeller drives the water flow to rotate, the spiral groove can use the force of the water flow to throw foreign objects away from the surface of the bushing 10 along the spiral direction. The distance between two adjacent grooves in the spiral groove along the axial direction of the bushing 10 can be 1mm, 3mm, 6mm, or 8mm. The distance between two adjacent grooves in the spiral groove along the axial direction of the bushing 10 can also be any value from 1mm to 8mm, and no specific limitation is made here. When the distance between two adjacent grooves in the spiral groove along the axial direction of the bushing 10 is in the range of 1mm to 8mm, the spiral groove has a large guiding space, which reduces the concentrated accumulation of foreign objects on the surface of the bushing 10, and at the same time reduces the direct contact between foreign objects and the surface of the bushing 10.

[0042] The rib structure can be designed with multiple ribs on the surface of the bushing 10. These ribs can be straight, spiral, or other shapes. The ribs can increase the surface undulation or roughness of the bushing 10, reduce the adhesion of foreign objects, and thus prevent foreign objects from tightly adhering to the surface of the bushing 10. At the same time, the ribs can guide the foreign objects to move in a specific direction, while water flow disturbance helps the foreign objects to fall off.

[0043] The spiral flow guiding structure can be designed with spiral-shaped flow guiding grooves on the surface of the bushing 10. Utilizing the centrifugal force of the spiral structure, foreign objects are thrown away from the surface of the bushing 10 along the spiral direction, thereby preventing entanglement. Furthermore, due to the presence of the flow guiding grooves, the contact area between the foreign object and the surface of the bushing 10 is reduced, thus reducing the adhesion force between the foreign object and the surface of the bushing 10, making it easier for the foreign object to be removed or detached from the surface of the bushing 10. The spiral direction of the spiral flow guiding structure is consistent with the rotation direction of the impeller-driven water flow.

[0044] The lubricating coating structure can be achieved by applying a lubricating coating to the surface of the bushing 10, resulting in a low surface energy on the outer side of the bushing. This design reduces the adhesion of foreign objects, making them easier to slide off and preventing them from becoming entangled.

[0045] The serrated cutting structure can be multiple serrated cutting edges located on the surface of the bushing 10. The serrated structure can cut fibers or hair wrapped around the surface of the bushing 10, preventing them from accumulating and tangling. At the same time, the serrated structure can increase the undulation or roughness of the surface of the bushing 10, reducing the adhesion of foreign objects.

[0046] It should be noted that the exemplary description of the anti-winding structure 111 above is not an exhaustive list. The types of anti-winding structures 111 protected by this application are not limited to those listed above. Those skilled in the art can adjust the anti-winding structure 111 according to the actual situation, as long as the technical principles of this application can be achieved.

[0047] The bushing 10 includes a first section 110 and a second section 120 connected to the first section 110. The second section 120 is interference-fitted with the inner ring of the bearing 220. The anti-winding structure 111 is provided on the surface of the first section 110 away from the rotating shaft 211.

[0048] like Figure 3 As shown, the bushing 10 may include a first segment 110 and a second segment 120 connected to the first segment 110. The first segment 110 may be located on the outside of the motor 210 housing and be in direct contact with the external environment. Therefore, an anti-winding structure 111 is provided on the outer surface of the first segment 110.

[0049] The second segment 120 can be located inside the housing of the motor 210. The housing of the motor 210 can protect the second segment 120 and the bearing 220 inside the bushing 10 from direct contact with the external environment. The anti-winding structure 111 (such as a spiral groove, annular groove, etc.) can guide foreign objects to fall off the bushing 10, reducing the risk of foreign objects getting tangled on the rotating shaft 211. The second segment 120, for example, is in direct contact with the inner ring of the bearing 220. The interference fit between the second segment 120 and the inner ring of the bearing 220 can provide stable support for the bushing 10 and ensure a tight connection between the bushing 10 and the bearing 220. The second segment 120 can evenly transfer the load of the rotating shaft 211 to the inner ring of the bearing 220, reducing local stress concentration and improving the load-bearing capacity of the automatic water tank cleaning device.

[0050] According to the bushing 10 provided in this application, the end of the second segment 120 away from the first segment 110 extends radially to form a retaining ring 121, and the retaining ring 121 abuts against the inner ring of the bearing 220.

[0051] like Figure 3 As shown, the retaining ring 121 can be located on the second segment 120. Specifically, the retaining ring 121 is opposite to the end of the first segment 110, that is, the second segment 120 has two ends, one of which (e.g., Figure 3 The upper end shown is connected to or faces the first segment 110; the other end (e.g. Figure 3 The lower end shown is opposite to the first segment 110; in other words, the other end is away from the first segment 110.

[0052] The retaining ring 121 can directly contact the inner ring of the bearing 220, providing support and positioning for the inner ring. The retaining ring 121 can be a ring-shaped structure and can be evenly distributed around the outer circumference of the bushing 10. The dimensions (such as thickness and width) of the retaining ring 121 are designed according to specific application requirements, for example, ranging from a few millimeters to tens of millimeters. The retaining ring 121 provides axial support for the bushing.

[0053] The retaining ring 121 and the inner ring of the bearing 220 can be fixed by heat pressing. For example... Figure 4 As shown, for example, the retaining ring 121 can be preheated, causing the hot-pressing fixing hole 122 on the retaining ring 121 to expand due to heat. Then, the target protrusion is fitted into the hot-pressing fixing hole 122. After the hot-pressing fixing hole 122 cools and shrinks, the hot-pressing fixing hole 122 can securely fit the target protrusion.

[0054] According to the bushing 10 provided in this application, the inner diameter of the second segment 120 is larger than the inner diameter of the first segment 110.

[0055] The inner diameter of the second section 120 is larger than that of the first section 110. On the one hand, this allows the second section 120 to fit tightly with the inner ring of the bearing 220. On the other hand, it can enhance the overall rigidity of the bushing 10 along its axial direction and increase the space for lubricating oil in the second section.

[0056] According to the bushing 10 provided in this application, the second section 120 is also provided with an oil seal for sealing the lubricating oil.

[0057] The term "oil seal" can refer to a ring-shaped, resilient sealing element. For example, an oil seal can be installed between a shaft 211 and a bushing 10 to prevent lubricating oil leakage and the ingress of external contaminants. The oil seal forms a seal by elastically deforming and tightly conforming to the surface of the shaft 211.

[0058] Oil seals can be made of elastic materials such as rubber or polytetrafluoroethylene, and they possess excellent sealing performance and elastic deformation capabilities. During the rotation of the shaft 211, a pressure difference is created between the oil seal and the surface of the shaft 211, further enhancing the sealing effect and preventing liquid (water) in the working environment of the electric device 200 from entering the shaft 211 through the gap between the bushing 10 and the shaft 211 of the motor 210, thus ensuring the sealing performance of the electric device 200.

[0059] According to the bushing 10 provided in this application, a sealing ring is provided on the outer side of the second segment 120, and the sealing ring is used to seal the connection between the bushing 10 and the bearing 220; or, the bushing 10 is made of copper.

[0060] like Figure 1 As shown, a sealing groove 123 is provided on the outer side of the second segment 120, and a sealing ring is provided in the sealing groove 123. The sealing ring can be located at the connection between the bushing 10 and the bearing 220. The sealing ring is used to seal the connection between the bushing 10 and the bearing 220, thereby achieving a seal between the inner ring of the bushing 10 and the bearing 220. Specifically, the inner diameter of the sealing ring matches the outer diameter of the bushing 10 to ensure a tight fit. The sealing ring, through its elastic deformation, tightly fits the surfaces of the bushing 10 and the bearing 220, forming a seal.

[0061] The bushing 10 is made of copper, specifically copper or a copper alloy. Copper offers excellent wear resistance, reducing wear during operation. Copper alloys are self-lubricating, minimizing foreign matter adhesion. In high-load, high-speed applications, copper bushings significantly extend the lifespan of the automatic pool cleaning device. Copper also boasts excellent thermal conductivity, effectively transferring heat and reducing heat accumulation during operation. In high-temperature environments, copper bushings effectively dissipate heat and offer superior corrosion resistance, making them suitable for swimming pool water conditions and improving the operational stability of the automatic pool cleaning device. Alternatively, the bushing 10 can be made of phosphor bronze, combining strength and wear resistance for an even longer service life.

[0062] This application also provides an automatic water tank cleaning device, which includes a motor 210, a bearing 220, an impeller, and the bushing 10 mentioned above. The bushing 10 is sleeved on the rotating shaft 211 of the motor 210, and a foreign object prevention gap is formed between the bushing 10 and the rotating shaft 211 of the motor 210. The foreign object prevention gap is smaller than the diameter of a hair, which can prevent hair from entering between the bushing 10 and the rotating shaft 211 of the motor 210. The bushing 10 is interference-fitted with the inner ring of the bearing 220, and the impeller is fixed to the rotating shaft 211 of the motor 210.

[0063] By installing a bushing 10 on the shaft 211 of the motor 210 of the automatic water tank cleaning device, with the bushing 10 having an interference fit with the inner ring of the bearing 220, the probability of foreign objects getting entangled on the bearing 220 and the shaft 211 of the motor 210 can be reduced. This eliminates the need for frequent shutdowns to clean foreign objects, thus solving the problem of hair, fibers, and other foreign objects getting entangled. Furthermore, the motor 210 has higher working efficiency and a longer service life. Since the motor shaft 211 is equipped with an impeller, when the motor drives the impeller to rotate, the impeller agitates the water flow, and the rotating water flow can carry foreign objects entangled on the bushing and shaft away from the shaft and bushing. Moreover, at least a portion of the anti-entanglement structure can extend in the same direction as the water flow rotation, further improving the efficiency of foreign objects detaching from the shaft and bushing.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0066] In this application, unless otherwise stated, directional terms such as "up" and "down" refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this application.

[0067] The above description is merely an exemplary embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope described in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A bushing (10) for an electric actuator (200), the electric actuator (200) comprising a motor (210) and a bearing (220), the bushing (10) being sleeved on the rotating shaft (211) of the motor (210), wherein, A foreign object prevention gap is formed between the bushing (10) and the rotating shaft (211) of the motor (210), and the bushing (10) and the inner ring of the bearing (220) are interference fit; The bushing (10) is provided with an anti-winding structure (111) on the outside, which is used to prevent foreign objects from getting entangled.

2. The bushing (10) according to claim 1, wherein, The anti-winding structure (111) includes a hole structure, a groove structure, a rib structure, a spiral flow guiding structure, a lubricating coating structure, or a sawtooth cutting structure.

3. The bushing (10) according to claim 1, wherein, When the anti-winding structure (111) includes a groove structure, the groove structure includes an annular groove, a spiral groove, a straight groove or a grid groove.

4. The bushing (10) according to claim 3, wherein, When the groove structure is a spiral groove, the groove depth of the spiral groove is 0.1mm to 2mm; and / or, the inclination angle of the spiral groove is 10° to 40°; and / or, the distance between two adjacent grooves in the spiral groove along the axial direction of the bushing (10) is 1mm to 8mm.

5. The bushing (10) according to any one of claims 1 to 4, wherein, The bushing (10) includes a first segment (110) and a second segment (120) connected to the first segment (110). The second segment (120) is interference-fitted with the inner ring of the bearing (220). The anti-winding structure (111) is provided on the surface of the first segment (110) away from the rotating shaft (211).

6. The bushing (10) according to claim 5, wherein, The second segment (120) extends radially away from the end of the first segment (110) to form a retaining ring (121), which abuts against the inner ring of the bearing (220).

7. The bushing (10) according to claim 5, wherein, The inner diameter of the second segment (120) is larger than the inner diameter of the first segment (110).

8. The bushing (10) according to claim 5, wherein, The second section (120) is also equipped with an oil seal for sealing the lubricating oil.

9. The bushing (10) according to claim 5, wherein, A sealing ring is fitted on the outer side of the second segment (120), and the sealing ring is used to seal the connection between the bushing (10) and the bearing (220); Alternatively, the bushing (10) may be made of copper.

10. An automatic water tank cleaning device, wherein, The device includes a motor (210), a bearing (220), an impeller, and a bushing (10) as described in any one of claims 1 to 9. The bushing (10) is fitted onto the rotating shaft (211) of the motor (210), and a foreign object prevention gap is formed between the bushing (10) and the rotating shaft (211) of the motor (210). The bushing (10) is interference-fitted with the inner ring of the bearing (220), and the impeller is fixed to the rotating shaft (211) of the motor (210).

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