A pool cleaner brushless motor

Abstract

A kind of pool sweeper brushless motor, including a housing, the housing inside is provided with the cavity of two end ports, also include: stator assembly, the stator assembly is installed in cavity, and the stator assembly is shaped with center hole, and the stator assembly with the waterproof structure between the inner wall of the cavity is used to fill the gap between the stator assembly and the inner wall of cavity;Rotor assembly, the rotor assembly is set in the center hole, and both ends are rotatably connected in the cavity, the rotor assembly includes the magnetic ring encapsulated in waterproof layer, and the waterproof layer is connected with impeller to push water flow.The brushless motor provided by the present technology, the stator assembly and the rotor assembly are respectively waterproofed, so that the space in the motor cavity can be the same as the pressure of external space, so as not to be affected by pressure difference, and ensure the waterproof effect.

Description

Technical Field

[0001] This utility model relates to the field of brushless motor technology, specifically to a brushless motor for a swimming pool cleaner. Background Technology

[0002] With the continuous development of society and the improvement of people's living standards, people's requirements for their living environment are also increasing. As an important leisure facility in modern life, the cleaning and maintenance of swimming pools has become particularly important. However, traditional pool cleaning methods have many problems. Traditional pool cleaning mainly relies on manual operation, where the water is drained from the pool, and then tools such as brushes and vacuum cleaners are used for cleaning. This method is not only time-consuming and labor-intensive, but also ineffective, and needs improvement.

[0003] Therefore, a swimming pool cleaning robot is currently available to move along the bottom of the pool and clean it, removing sediment and debris, thus significantly improving cleaning efficiency. The robot is driven by a motor. Since the working environment of the swimming pool cleaning robot is underwater, the motor housing needs to be waterproof. Current swimming pool cleaning robots use rubber sealing rings at the mounting gaps in the housing to seal the cavity containing the motor assembly from the outside. However, this sealing structure is relatively complex and prone to leaks during long-term operation.

[0004] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this utility model is to provide a brushless motor for a swimming pool cleaner to solve the above-mentioned technical problems. The technical solution adopted by this utility model is as follows:

[0006] A brushless motor for a swimming pool cleaner includes a housing with an internal cavity having openings at both ends. The housing also includes two end caps that respectively close the openings. The motor further includes:

[0007] A stator assembly is installed in a cavity and has a central hole. A waterproof structure is provided between the stator assembly and the inner wall of the cavity to fill the gap between the stator assembly and the inner wall of the cavity.

[0008] A rotor assembly is disposed within the central hole and rotatably connected at both ends within the cavity. The rotor assembly includes a magnetic ring encapsulated within a waterproof layer, and the waterproof layer is connected to an impeller for propelling water flow.

[0009] Furthermore, the waterproof layer is integrally injection molded from plastic material, and the magnetic ring is sealed inside it. The two ends of the waterproof layer are rotatably connected to the cavity.

[0010] Furthermore, the rotor assembly has a central bore coaxial with the central bore, and the impeller is formed inside the central bore to drive the water flow along the axis of the central bore and generate axial thrust.

[0011] Furthermore, the waterproof structure includes an encapsulation portion formed by potting within the cavity, the encapsulation portion sealingly encapsulating the stator assembly within it.

[0012] Furthermore, the stator assembly also includes a wound iron core, which is encapsulated within the encapsulation portion.

[0013] Furthermore, the stator assembly also includes a wire frame mounted on the iron core, the wire frame being encapsulated within the encapsulation portion, and a Hall element being fixedly mounted on the wire frame, the Hall element being electrically connected to an external power supply via leads.

[0014] Furthermore, a plurality of mounting slots are formed on the inner wall of the iron core at equal intervals along the circumferential direction; the wire frame includes a first frame and a second frame that are connected to each other. The first frame and the second frame each include a plug-in part that is connected to each other and inserted into the mounting slots at both ends of the iron core. A slot is formed on the plug-in part, so that after the first frame and the second frame are connected to each other, a wire slot for winding the winding is formed.

[0015] Furthermore, the Hall element is fixedly mounted at the end of the first frame or the second frame.

[0016] Furthermore, the rotor assembly is fitted with a ceramic bearing, and the outer ring of the ceramic bearing is fixedly installed inside the cavity.

[0017] The beneficial effects of this utility model are as follows:

[0018] The present invention will now be described in detail with reference to the accompanying drawings.

[0019] This utility model embodiment provides a brushless motor for a pool cleaner. The technical solution provided in this embodiment simplifies the waterproof structure and improves waterproof performance by designing a waterproof structure for the motor. The brushless motor reduces the number of electrical connection components between the rotor and stator. By encapsulating a magnetic ring composed of permanent magnets within a waterproof layer and setting a waterproof structure on the cavity and stator assembly, separate waterproof designs can be achieved for the stator and rotor assemblies. This avoids the need for waterproofing the outer shell, which would otherwise result in a sealed cavity inside the shell, thus simplifying the waterproof structure and improving waterproof performance. It is worth noting that in traditional motors, a waterproof structure on the outer shell keeps the cavity sealed. However, when the motor is underwater, the pressure difference between the inside and outside of the cavity creates a pressure difference on the waterproof structure, leading to leaks after prolonged use and resulting in poor waterproofing. The brushless motor provided by this technology features separate waterproofing for the rotor and stator assemblies, ensuring that the pressure inside the motor cavity is the same as the external pressure, thus preventing the motor from being affected by pressure differences and guaranteeing its waterproofing effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the exploded structure of this utility model.

[0022] Figure 3 This is a cross-sectional view of the rotor assembly in this utility model.

[0023] Figure 4 This is a cross-sectional view of the stator assembly in this utility model.

[0024] Figure 5 This is an exploded view of the stator assembly in this utility model.

[0025] In the diagram: 100-Housing; 110-Cavity; 120-End cap; 200-Stator assembly; 210-Center hole; 300-Rotor assembly; 310-Waterproof layer; 320-Magnetic ring; 330-Impeller; 301-Shaft hole; 201-Encapsulation part; 220-Iron core; 221-Wire frame; 222-Mounting slot; 2211-First frame; 2212-Second frame; 2213-Plug-in part; 2214-Slot; 223-Hall element; 302-Ceramic bearing. Detailed Implementation

[0026] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0027] This utility model embodiment provides a brushless motor for a swimming pool cleaner. The technical solution provided in this embodiment simplifies the waterproof structure and improves waterproof performance by setting up a waterproof structure for the motor. The brushless motor reduces the number of electrical connection components between the rotor and stator. By encapsulating a magnetic ring 320 composed of permanent magnets within a waterproof layer 310 and setting a waterproof structure on the cavity 110 and the stator assembly 200, separate waterproof designs for the stator assembly 200 and rotor assembly 300 can be achieved. This avoids the need for waterproofing on the housing 100, which would result in a sealed cavity 110 inside the housing 100, thus simplifying the waterproof structure and improving waterproof performance. It is worth noting that in traditional motors, a waterproof structure is installed on the housing 100 to keep the cavity 110 sealed. However, when the motor is underwater, the pressure difference between the inside and outside of the cavity 110 creates a pressure difference on the waterproof structure. This can lead to leaks after prolonged use, resulting in poor waterproofing. The brushless motor provided by this technology, with separate waterproofing for the rotor assembly 300 and stator assembly 200, ensures that the pressure inside the motor cavity 110 is the same as the external pressure, thus preventing the impact of pressure differences and guaranteeing a waterproof effect.

[0028] Specifically, such as Figure 1-5 As shown in the technical solution of this embodiment, a brushless motor for a swimming pool cleaner is disclosed, including a housing 100, a cavity 110 with openings at both ends inside the housing 100, and two end caps 120 that respectively close the openings. It also includes a stator assembly 200 and a rotor assembly 300. The stator assembly 200 is installed in the cavity 110 and has a central hole 210. A waterproof structure is provided between the stator assembly 200 and the inner wall of the cavity 110 to fill the gap between them. The rotor assembly 300 is disposed within the central hole 210 and rotatably connected at both ends within the cavity 110. The rotor assembly 300 includes a magnetic ring 320 encapsulated within a waterproof layer 310, and the waterproof layer 310 is connected to an impeller 330 for driving water flow.

[0029] A waterproof structure is provided on the inner wall of the stator assembly 200 and the cavity 110 to fill the gap between the stator assembly 200 and the inner wall of the cavity 110, thereby sealing the stator assembly 200 within the waterproof structure. This encloses the stator assembly 200 in the waterproof structure, isolating it from the outside and thus providing waterproof protection. At the same time, the magnetic ring 320 is placed inside the waterproof layer 310, which seals the magnetic ring 320, preventing it from being exposed to water and avoiding corrosion from the pool water to maintain stable magnetism. During motor operation, after power is supplied to the stator assembly 200, the stator assembly 200 generates a rotating magnetic field, which interacts with the magnetic ring 320, causing the rotor assembly 300 to rotate and driving the impeller 330 to rotate, thereby generating thrust to drive the sweeper to move. It is worth noting that in this technical solution, the magnetic ring 320 is made of permanent magnet, which ensures that a stable magnetic field can be generated, and thus interact with the rotating magnetic field generated by the stator assembly 200 to make the rotor assembly 300 rotate, so as to drive the sweeper to move through the thrust generated by the impeller 330.

[0030] In this embodiment, as Figure 3 As shown, the waterproof layer 310 is integrally injection molded from plastic material, and the magnetic ring 320 is sealed inside it. The two ends of the waterproof layer 310 are rotatably connected to the cavity 110. By integrally injection molding the magnetic ring 320 into the cavity 110, the magnetic ring 320 is protected and waterproofed, preventing it from coming into contact with the water in the pool and thus avoiding corrosion.

[0031] In this embodiment, the rotor assembly 300 has a central bore 301 coaxial with the central bore 210. The impeller 330 is formed within the central bore 301 to drive water flow along the axial direction of the central bore 301 and generate axial thrust. The motor is designed as a hollow structure, allowing water to flow within the central bore 301, thereby generating axial thrust to move the sweeper. Simultaneously, the water flow within the central bore 301 also helps cool the rotor assembly 300 and the stator assembly 200, ensuring reliable operation.

[0032] In this embodiment, as Figure 2 , 4 As shown in Figure 5, the waterproof structure includes an encapsulation section 201 formed by potting and molding within the cavity 110, which encapsulates the stator assembly 200 in a sealed manner inside.

[0033] In this technical solution, the stator assembly 200 is sealed and isolated from the outside by filling it into the encapsulation part 201. The process of filling and molding the encapsulation part 201 can be as follows: the stator assembly 200 is placed inside the cavity 110, and adhesive is simultaneously poured between the stator assembly 200 and the inner wall of the cavity 110, gradually filling the gap between the stator assembly 200 and the cavity 110. Simultaneously, the adhesive fills the gaps within the stator assembly 200 until the entire stator assembly is encapsulated. The stator assembly 200 is completely enclosed, thus isolating the entire stator assembly 200 from the external space and achieving waterproofing. Alternatively, the stator assembly 200 can be placed in the cavity of a pre-set mold, glue can be poured into the mold cavity, and the encapsulation part 201 can be injection molded, thereby simultaneously injection molding the stator assembly 200 onto the inner wall of the encapsulation part 201, thus isolating the stator assembly 200 from the outside. Then, the injection-molded encapsulation part 201 is assembled into the cavity 110.

[0034] The brushless motor provided by this technical solution isolates the stator assembly 200 and rotor assembly 300 from the outside by encapsulating them in the encapsulation part 201 and the waterproof layer 310, respectively, thus achieving a waterproof effect. In this technical solution, the waterproof structure is simple, and after waterproofing the stator assembly 200 and rotor assembly 300, no pressure difference is generated, thus preventing damage to the waterproof structure and improving the waterproof effect. At the same time, during motor operation, driven by the impeller 330, water flows along the shaft hole 301 and generates axial thrust, thereby absorbing the heat generated by the motor during the water flow and reducing the motor operating temperature.

[0035] In this embodiment, the stator assembly 200 further includes a core 220 with windings wound on it. The core 220 is encapsulated within the encapsulation portion 201. The stator assembly 200 also includes a wire frame 221 mounted on the core 220. The wire frame 221 is encapsulated within the encapsulation portion 201, and a Hall element 223 is fixedly mounted on the wire frame 221. The Hall element 223 is electrically connected to an external power supply through leads.

[0036] By incorporating a Hall element 223, whose leads extend out of the package 201 and are electrically connected to an external power supply and controller, the position of the rotor assembly 300 can be detected and feedback signals can be provided, enabling sensor-based control of the motor. This allows for precise adjustment of the motor's speed and optimization of annual starting torque and operating efficiency.

[0037] In this embodiment, in order to support the winding during the stator winding process, a plurality of mounting grooves 222 are formed on the inner wall of the iron core 220 at equal intervals along the circumferential direction; the wire frame 221 includes a first frame 2211 and a second frame 2212 that are connected to each other. The first frame 2211 and the second frame 2212 each include a plug-in portion 2213 that is connected to each other and inserted into the mounting groove 222 at both ends of the iron core 220. A groove portion 2214 is formed on the plug-in portion 2213, so that after the first frame 2211 and the second frame 2212 are connected to each other, a wire groove for winding the winding is formed.

[0038] In other words, during the winding process, the winding is wound within the groove formed by the docking of the first frame 2211 and the second frame 2212, which can restrict and support the winding.

[0039] In this embodiment, the Hall element 223 is fixedly mounted at the end of the first frame 2211 or the second frame 2212, thereby ensuring that the Hall element 223 has a stable mounting position and ensuring the corresponding positional accuracy with the stator coil.

[0040] In this embodiment, to improve the rotational stability of the rotor assembly, ceramic bearings 302 are provided at both ends of the rotor assembly 300. The inner rings of the ceramic bearings 302 are fixedly sleeved at both ends of the rotor assembly, and the outer rings of the ceramic bearings 302 are fixedly installed inside the cavity. In other embodiments, the two ends of the rotor assembly 300 can also be rotatably connected to two end caps via ceramic bearings 302. After the end caps are closed onto the cavity, the rotor assembly can rotate within the cavity. It is conceivable that the end caps have holes that communicate with the shaft center hole of the rotor assembly, allowing water to flow along the axis and generate thrust in the axial direction. In this embodiment, to prevent the bearings from being corroded by water during prolonged operation in the water tank, waterproof ceramic bearings are preferably used, thereby improving the service life of the sweeper.

[0041] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A brushless motor for a swimming pool cleaner, comprising a housing, wherein the housing has an internal cavity with openings at both ends, and the housing further comprising two end caps that respectively close the openings, characterized in that, It also includes: A stator assembly is installed in a cavity and has a central hole. A waterproof structure is provided between the stator assembly and the inner wall of the cavity to fill the gap between the stator assembly and the inner wall of the cavity. A rotor assembly is disposed within the central hole and rotatably connected at both ends within the cavity. The rotor assembly includes a magnetic ring encapsulated within a waterproof layer, and the waterproof layer is connected to an impeller for propelling water flow.

2. The brushless motor for a swimming pool cleaner according to claim 1, characterized in that, The waterproof layer is integrally injection molded from plastic material, and the magnetic ring is sealed inside it. The two ends of the waterproof layer are rotatably connected to the cavity.

3. The brushless motor for a swimming pool cleaner according to claim 2, characterized in that, The rotor assembly has a central bore coaxial with the central hole, and the impeller is formed inside the central bore to drive the water flow along the axis of the central bore and generate axial thrust.

4. The brushless motor for a swimming pool cleaner according to claim 1, characterized in that, The waterproof structure includes an encapsulation portion formed by potting within the cavity, which hermetically encapsulates the stator assembly within it.

5. A brushless motor for a swimming pool cleaner according to claim 4, characterized in that, The stator assembly also includes a wound iron core, which is encapsulated within the encapsulation portion.

6. A brushless motor for a swimming pool cleaner according to claim 5, characterized in that, The stator assembly also includes a wire frame mounted on the iron core. The wire frame is encapsulated within the encapsulation part, and a Hall element is fixedly mounted on the wire frame. The Hall element is electrically connected to an external power supply via leads.

7. A brushless motor for a swimming pool cleaner according to claim 6, characterized in that, The inner wall of the iron core is formed with a plurality of mounting slots evenly spaced along the circumferential direction; the wire frame includes a first frame and a second frame that are connected to each other. The first frame and the second frame each include a plug-in part that is connected to each other and inserted into the mounting slots at both ends of the iron core. The plug-in part is formed with a slot, so that after the first frame and the second frame are connected to each other, they form a wire slot for winding the winding.

8. A brushless motor for a swimming pool cleaner according to claim 7, characterized in that, The Hall element is fixedly installed at the end of the first frame or the second frame.

9. A brushless motor for a swimming pool cleaner according to claim 1, characterized in that, The rotor assembly is fitted with a ceramic bearing, and the outer ring of the ceramic bearing is fixedly installed inside the cavity.

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