Submersible pump capable of effectively avoiding scale blockage of rotating mechanism

Abstract

The utility model provides a submersible pump can effectively avoid water scale to block rotating mechanism, aiming at the technical defects that the existing submersible pump is caused water scale to block and leads to rotating mechanism to be stuck, through magnetic coupling drive and special limit structure, impeller and rotating shaft do not need direct mechanical contact, avoid water scale deposition in the gap between shaft and bearing, facilitate dismounting and cleaning simultaneously, prolong service life. Its pump casing includes independently arranged and mutually sealed and separated motor casing, permanent magnet piece casing and impeller casing. Impeller and rotating shaft realize non - contact power transmission through magnetic coupling, avoid mechanical shaft to extend into impeller casing completely, and water scale deposition in the gap between shaft and bearing is avoided, and the risk of being stuck is eliminated from the root. Impeller adopts multiple limit structures, ensures that impeller and rotating shaft rotate coaxially, and does not need traditional precision shaft sleeve, and the structure is simple, and it is convenient to dismount, clean and maintain. It is suitable for the occasion that water quality hardness is higher or water scale is easy to produce in long - term operation, such as humidifier, water circulation system etc.

Description

Technical Field

[0001] This invention relates to a submersible pump, and more particularly to a submersible pump that can effectively prevent scale buildup from clogging the rotating mechanism. Background Technology

[0002] Existing centrifugal submersible pumps are mainly divided into two categories: one type has the motor and impeller directly connected via a shaft, relying on mechanical seals (such as skeleton oil seals or water seals) to prevent water from entering the motor. However, after long-term use, the seals wear out, easily leading to water ingress and damage to the motor. Furthermore, the gap between the shaft and bearings is prone to jamming due to the accumulation of scale, silt, and other impurities, potentially even burning out the motor. The other type embeds a permanent magnet into the impeller to form the motor rotor, isolating it from the stator and achieving a waterproof effect without a mechanical seal. However, the impeller still needs the shaft and bushing to guide its rotation. The tiny gap between the shaft and bushing can still increase friction due to scale buildup, eventually leading to obstructed rotation or jamming. Especially in water circulation systems such as humidifiers, continuous evaporation increases the mineral concentration in the water, accelerating scale formation. The rotating mechanism of traditional submersible pumps is prone to failure, requiring frequent maintenance. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a submersible pump that can effectively avoid scale buildup in the rotating mechanism. It addresses the technical defect of existing submersible pumps where scale buildup causes the rotating mechanism to jam. Through magnetic coupling transmission and a special limiting structure, the impeller and the shaft do not need to have direct mechanical contact, thus preventing scale from depositing in the gap between the shaft and the bearing. At the same time, it is easy to disassemble and clean, and extends the service life.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: The present invention relates to a submersible pump that effectively avoids scale buildup clogging the rotating mechanism, comprising a main control circuit board, a pump housing, a stator assembly, a rotor assembly, and an impeller. The pump housing comprises, from top to bottom, a motor housing, a permanent magnet housing, and an impeller housing, adjacent to each other. The motor housing is used to mount the stator assembly and the rotor assembly. The permanent magnet housing is made of non-magnetic material and is used to mount a shaft-end permanent magnet component located at the lower end of the rotor shaft in the rotor assembly. The impeller housing is used to mount the impeller. The motor housing, permanent magnet housing, and impeller housing are spatially independent and sealed. The impeller disc is provided with a wheel-end permanent magnet component that is magnetically coupled to the shaft-end permanent magnet component. A limiting structure is provided inside the impeller housing or on the impeller to ensure that the impeller rotates coaxially with the rotor shaft. The stator assembly is water-sealed within the motor housing using a potting compound structure.

[0005] The motor housing includes a stator chamber for mounting the stator assembly and a rotor chamber for mounting the rotor assembly. The stator chamber and the rotor chamber are two mutually sealed and separated chambers. The lower end face of the stator chamber is a closed surface, and the upper end face of the stator chamber is an open surface. The stator assembly is fitted onto the outer peripheral wall of the rotor chamber, and water sealant is filled into the stator chamber. The upper end face of the rotor chamber is a closed surface, and the lower end face of the rotor chamber is an open surface. A water-sealing seat is provided on the open surface to seal and separate the rotor chamber from the permanent magnet housing. The lower end of the rotating shaft passes through a shaft hole located in the center of the water-sealing seat, extends downward, and is placed inside the permanent magnet housing and fixedly connected to the shaft end permanent magnet component.

[0006] The impeller housing includes a bottom cover plate and a circular cavity wall plate extending upward from the bottom cover plate. The impeller chamber is a space enclosed by the cavity wall plate. The upper end face of the impeller chamber is open and faces the flat top plate of the outlet pipe housing. The inlet of the submersible pump is located on the bottom cover plate where the impeller chamber is located. The outlet of the impeller chamber is located on the cavity wall plate and communicates with the outlet pipe of the submersible pump. The outlet pipe is located on the side of the pump housing and extends upward.

[0007] The permanent magnet housing and the water outlet pipe housing are integrally structured. The permanent magnet chamber accommodating the shaft-end permanent magnet component is located below the water sealing seat and is sealed and separated from the water outlet pipe. The water outlet pipe is located on the side of the permanent magnet housing, and the water inlet of the water outlet pipe is connected to the water outlet on the impeller housing.

[0008] The impeller includes blades, a disk, and a shaft. The disk is made of a non-magnetic material and has a cavity to accommodate the permanent magnet component at the end of the disk. The shaft is a semi-circular convex shaft located at the center of the blade assembly and extending downwards. The limiting structure includes a convex ball in the shape of a spherical cap on the top panel of the disk and a guide ball groove on the bottom surface of the permanent magnet component housing. The convex ball is located on the top panel of the disk at a position offset from the center of rotation of the disk. The guide ball groove is annular with a semi-circular cross-section. When the impeller rotates, the convex ball is embedded in the guide ball groove and rotates in a circular motion with the impeller.

[0009] The permanent magnet housing is an independent component located between the top panel of the motor housing and the water outlet pipe housing. The permanent magnet chamber that houses the shaft-end permanent magnet component is located below the water sealing seat. The impeller housing is fastened to the opening at the lower end of the water outlet pipe housing from bottom to top.

[0010] The impeller includes blades, a disk, and a shaft. The disk is made of a non-magnetic material and has a cavity to accommodate the permanent magnet component at the end of the impeller. The limiting structure is the shaft that runs through the disk. The upper end of the shaft is embedded in a recessed shaft cavity located at the center of the bottom surface of the top panel, and the lower end of the shaft is embedded in a shaft cup located at the center of the bottom plate of the impeller chamber.

[0011] The axle cup is integrated with the bottom cover plate of the wheel chamber, and it is connected to other parts of the wheel chamber through the spoke ribs set on the bottom plate.

[0012] The impeller includes blades, a disk, and a shaft. The disk is made of a non-magnetic material and has a cavity to accommodate the permanent magnet component at the end of the impeller. The shaft is a semi-circular column that is located at the center of the blade assembly and extends downward. The limiting structure includes an annular slide that is recessed inward on the side wall of the disk and a plurality of semi-circular protrusions that are located on the inner side wall of the wheel cover. The protrusions are embedded in the annular slide.

[0013] A cavity for accommodating the lower bearing is provided on the upper surface of the water sealing seat. A graphite wear-resistant sheet is provided between the lower bearing and the rotor. The upper bearing, located at the upper end of the rotating shaft, is placed in the bearing sleeve at the top of the rotor chamber.

[0014] The impeller and shaft achieve non-contact power transmission through magnetic coupling, completely avoiding the mechanical shaft from entering the impeller housing and preventing scale buildup in the shaft-bearing gap. This eliminates the risk of jamming at its source, making it particularly suitable for applications with high water hardness or evaporation / concentration. The motor housing, permanent magnet housing, and impeller housing are independently sealed and separated. The motor interior and rotor chamber are isolated from water, and the stator is sealed with glue, ensuring high electrical safety. Even external water leakage will not affect the motor. The impeller employs various limiting structures (such as convex ball-guide ball groove, wheel-shaft cavity-shaft cup, annular slide-convex column, etc.) to ensure coaxial rotation between the impeller and shaft. It eliminates the need for traditional precision bushings, resulting in a simple structure that facilitates disassembly, cleaning, and maintenance. The upward extension of the outlet pipe places the outlet above the water surface, preventing backflow during shutdown. The permanent magnet housing and outlet pipe can be integrated or separate, flexibly adapting to different installation space requirements. It is suitable for applications with high water hardness or where scale buildup is likely during long-term operation, such as humidifiers and water circulation systems. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the external shape of the submersible pump of the present invention.

[0016] Figure 2 for Figure 1 Enlarged schematic diagram of Example 1, viewed in sectional view along the AA direction.

[0017] Figure 3 for Figure 2 The exploded view corresponding to Example 1 is shown.

[0018] Figure 4 for Figure 1 Enlarged schematic diagram of Example 2, viewed in sectional view along the AA direction.

[0019] Figure 5 for Figure 4 The diagram shown is an explosion diagram corresponding to implementation 2.

[0020] Figure 6 for Figure 1 Enlarged schematic diagram of Example 3, viewed in sectional view along the AA direction.

[0021] Figure 7 for Figure 6 The diagram shown is an explosion diagram corresponding to implementation 3.

[0022] The attached figures are labeled as follows: Submersible pump 1, main control circuit board 11, power cord 12, motor housing 2, stator chamber 21, stator assembly 22, rotor chamber 23, rotor assembly 24, rotating shaft 25, bearing sleeve 26, upper bearing 27, lower bearing 28, permanent magnet housing 3, shaft end permanent magnet component 31, magnetic turntable 32, water seal seat 33, graphite wear-resistant sheet 34, water seal ring 35, impeller housing 4, impeller 41, blade 42, wheel disc 43, wheel shaft 44, wheel end permanent magnet component 45, bottom cover plate 46, cavity wall plate 47, water inlet 48, water outlet 49, water outlet pipe housing 5, water outlet pipe 51, flat top plate 52, upper vertical plate 53, lower vertical plate 54, convex shaft 61, convex ball 62, guide ball groove 63, recessed shaft cavity 64, shaft cup 65, annular slide 66, convex column 67, wheel spoke rib plate 7. Detailed Implementation

[0023] like Figures 1-7 As shown, the submersible pump 1 of the present invention, which can effectively avoid scale buildup in the rotating mechanism, includes a main control circuit board 11, a pump housing, a stator assembly 22, a rotor assembly 24, and an impeller 41.

[0024] The pump housing is made of engineering plastics such as PPS (polyphenylene sulfide), PPO (polyphenylene oxide), and ABS (acrylonitrile-butadiene-styrene copolymer). It includes a motor housing 2, a permanent magnet housing 3, an impeller housing 4, and a water outlet pipe housing 5. The spaces enclosed by the motor housing 2, the permanent magnet housing 3, and the impeller housing 4 are independent and sealed. The water outlet pipe 51 in the water outlet pipe housing 5 is connected to the impeller housing 4.

[0025] 1. Motor housing 2.

[0026] As an independent component, it is used to install the stator assembly 22 and the rotor assembly 24. The motor housing 2 is provided with a stator chamber 21 for installing the stator assembly 22 and a rotor chamber 23 for installing the rotor assembly 24. The stator chamber 21 and the rotor chamber 23 are two chambers that are sealed and separated from each other. The main control circuit board 11 is placed in the stator chamber 21, and its power supply terminal is led out through the power line 12.

[0027] The lower end face of the stator chamber 21 is a closed surface, and the upper end face of the stator chamber 21 is an open surface. The stator assembly 22 is fitted onto the outer peripheral wall of the rotor chamber 23. The stator chamber 21 is filled with water sealant that can seal the main control circuit board 11 and the stator assembly 22 inside.

[0028] The rotor chamber 23 is vertically arranged, with its upper end face being a closed surface and its lower end face being an open surface. The lower end of the side wall of the rotor chamber 23 is integrated with the lower end face of the stator chamber 21.

[0029] A bearing sleeve 26 is provided at the top of the rotor chamber 23, and an upper bearing 27 is provided inside the bearing sleeve 26. The upper end of the rotating shaft 25 in the rotor assembly 24 is inserted into the upper bearing 27.

[0030] A water-sealing seat 33 (made of the aforementioned engineering plastic) is provided on the opening to seal it. The center of the water-sealing seat 33 has a shaft hole through which the rotating shaft 25 passes downwards. On the upper surface of the water-sealing seat 33 and around the shaft hole, there is an upwardly extending cylinder (also called a cavity). The lower bearing 28 of the rotor assembly 24 is installed inside this cylinder. The lower end of the rotating shaft 25 passes through the lower bearing 28, extends downwards, and is placed inside the permanent magnet housing 3, where it is fixedly connected to the shaft end permanent magnet component 31 within the permanent magnet housing 3. A graphite wear-resistant sheet 34 is provided between the lower bearing 28 and the rotor core in the rotor assembly 24 to reduce friction.

[0031] 2. Permanent magnet housing 3.

[0032] The permanent magnet housing 3 is located below the motor housing 2 and is fixed to the motor housing 2 by means of screw connection, snap connection or adhesive connection, with a water seal ring 35 provided therebetween.

[0033] The permanent magnet housing 3 is made of a non-magnetic material and includes a cavity (hereinafter referred to as the permanent magnet cavity) for accommodating the shaft-end permanent magnet component 31. It has the following two configurations:

[0034] 1) The permanent magnet housing 3 is an independent component, such as Figure 4 , Figure 6 As shown, it is a cylindrical shape with a closed bottom surface and an upward-extending peripheral wall. Its top surface faces upward and abuts against the motor housing 2. The permanent magnet component 31 at the shaft end is placed inside the cylinder (the space inside the cylinder is the permanent magnet chamber). The water seal ring 35 is disposed between the top of the peripheral wall of the permanent magnet component housing 3 and the bottom surface of the motor housing 2.

[0035] 2) The permanent magnet housing 3 and the water outlet pipe housing 5 are an integral structure, such as... Figure 2 As shown, the permanent magnet chamber accommodating the shaft-end permanent magnet component 31 is formed by a flat top plate 52 and an upper vertical plate 53 (the extended portion includes a flat top plate 52, an upper vertical plate 53, and a lower vertical plate 54) in the portion of the water outlet pipe housing 5 extending to the side opposite to the location of the water outlet pipe 51. This permanent magnet chamber is located below the water sealing seat 33 and is sealed and separated from the water outlet pipe 51, which is located on the side of the permanent magnet component housing 3. Similarly, a water sealing ring 35 is provided between the top of the peripheral wall of the permanent magnet chamber and the motor housing 2.

[0036] The shaft-end permanent magnet component 31 includes a magnetic turntable 32 and a multi-stage axial permanent magnet. The magnetic turntable 32 is a disc-shaped double-diameter sleeve with an opening facing downwards. Its center has a sleeve hole in which the lower end of the rotating shaft 25 can be fixed. The permanent magnet is fixed in the hollow cavity of the double-diameter sleeve. The shaft-end permanent magnet component 31 is an active magnetic drive. It can be a combination type or an integral type. The direction of the magnetic field it generates is parallel to the rotating shaft 25.

[0037] 3. Impeller casing 4.

[0038] It is a separate component used to install the impeller 41, which is fastened to the opening at the lower end of the outlet pipe housing 5 from bottom to top. The impeller housing 4 includes a bottom cover plate 46 and a circular cavity wall plate 47 extending upward from the bottom cover plate 46. The impeller chamber for installing the impeller 41 is a space enclosed by the cavity wall plate 47. The upper end face of the impeller chamber is open and faces the flat top plate 52 of the outlet pipe housing 5. The inlet 48 of the submersible pump 1 is located on the bottom cover plate 46 corresponding to the impeller chamber. The outlet 49 of the impeller chamber is located on the cavity wall plate 47 of the impeller chamber and communicates with the inlet of the outlet pipe 51. The outlet pipe 51 is located on the side of the pump housing and extends upward. Its outlet is above the water surface to prevent backflow due to siphon when the pump stops.

[0039] The impeller 41 includes blades 42, a disk 43, and a shaft 44. The disk 43 is made of a non-magnetic material (such as ABS or POM). A cavity is provided on the disk 43 of the impeller 41 for mounting a wheel-end permanent magnet component 45, which is a driven magnetic drive. The shaft-end permanent magnet component 31 and the wheel-end permanent magnet component 45 are connected by a linkage method of vertical magnetic coupling. A limiting structure is provided in the wheel cavity or on the impeller 41 to ensure that the impeller 41 rotates coaxially with the shaft 25.

[0040] The limiting structure is preferably one of the following three structures:

[0041] 1. Example 1: like Figure 2 , Figure 3As shown, the permanent magnet housing 3 and the water outlet pipe housing 5 are an integral structure. The wheel axle 44 is a semi-circular convex shaft 61 located at the center of the blade 42 and extending downwards. The limiting structure consists of a convex ball 62 (spherical cap shape) on the top panel of the wheel disc 43 and a guide ball groove 63 on the bottom surface of the permanent magnet housing 3 (which is also the flat top plate 52). The convex ball 62 is located off the rotation center of the wheel disc 43, and the guide ball groove 63 is annular with a semi-circular cross-section. During assembly, the impeller 41 is placed into the wheel chamber, and the convex ball 62 is embedded in the guide ball groove 63. Under the magnetic attraction of the permanent magnet component 31 at the shaft end and the permanent magnet component 45 at the wheel end, the impeller 41 is attracted and suspended. When the rotating shaft 25 rotates, the magnetic coupling drives the impeller 41 to rotate synchronously, and the convex ball 62 rolls along the guide ball groove 63, ensuring that the impeller 41 and the rotating shaft 25 are coaxial and have no mechanical contact points, preventing scale buildup.

[0042] 2. Example 2: like Figure 4 , Figure 5 As shown, unlike Embodiment 1, the permanent magnet housing 3 is an independent component, located between the top panel of the motor housing 2 and the water outlet pipe housing 5. The water outlet pipe housing 5 is made of a non-magnetic material. The impeller housing 4 is fastened to the opening at the lower end of the water outlet pipe housing 5 from bottom to top. The impeller 41's disc 43 also has a wheel-end permanent magnet component 45, but its limiting structure is a wheel shaft 44 (columnar) that passes through the center of the disc 43. The upper end of the wheel shaft 44 is embedded in the recessed shaft cavity 64 at the center of the bottom surface of the top panel, and the lower end is embedded in the shaft cup 65 at the center of the bottom cover plate 46 inside the wheel cavity. The shaft cup 65 and the bottom cover plate 46 are integrated, and the connection strength is enhanced by the spoke rib plate 7. After assembly, the two ends of the wheel shaft 44 are limited by the recessed shaft cavity 64 and the shaft cup 65 respectively, so that the impeller 41 can only rotate around its own axis and remains coaxial during magnetic coupling drive. This structure utilizes a clearance fit (not a tight fit) between the shaft end and the shaft cup 65. Even if scale forms, it will not jam because the clearance is large and there is no relative sliding friction surface (when the impeller 41 rotates, the wheel shaft 44 and the recessed shaft cavity 64 / shaft cup 65 have basically no relative rotation and only play a positioning role).

[0043] 3. Example 3: like Figure 6 , Figure 7As shown, the permanent magnet housing 3 is also an independent component, and the limiting structure of the impeller 41 differs from that in Embodiment 2. The impeller 41 has an inwardly recessed annular slide 66 on its sidewall of the disc 43, and multiple semi-circular protrusions 67 (preferably 3-6 evenly distributed) on the inner wall of the impeller chamber. During assembly, the impeller 41 is cold-pressed into the impeller chamber using the plastic deformation of the plastic material, causing the protrusions 67 to embed into the annular slide 66. When the impeller 41 rotates, the annular slide 66 slides relative to the protrusions 67, which constrain the radial displacement of the impeller 41, ensuring coaxiality. Because the contact surface between the slide and the protrusions 67 is a large arc surface with a loose gap, scale does not easily accumulate, and even if a small amount adheres, it will not hinder rotation.

[0044] All three embodiments described above employ the same main control circuit board 11 (placed within the stator chamber 21), stator assembly 22, and rotor assembly 24 structure. When the stator assembly 22 is energized, it generates a rotating magnetic field, driving the rotor assembly 24 to rotate. The shaft 25 drives the permanent magnet component 31 at its shaft end to rotate, and through magnetic coupling, the permanent magnet component 45 at the wheel end follows suit, thereby driving the impeller 41 to rotate and achieve water pumping. Because the motor housing 2, the permanent magnet housing 3, and the impeller housing 4 are independently sealed, water is completely isolated within the impeller housing 4 and the outlet pipe 51, preventing it from entering the motor. The impeller 41 has no traditional bushing; all limiting structures are either loose fits or rolling fits, completely solving the jamming problem caused by scale buildup, and also facilitating maintenance.

Claims

1. A submersible pump that effectively prevents scale buildup from clogging the rotating mechanism, comprising a main control circuit board (11), a pump housing, a stator assembly (22), a rotor assembly (24), and an impeller (41), characterized in that: The pump housing includes a motor housing (2), a permanent magnet housing (3), and an impeller housing (4) arranged sequentially from top to bottom. The motor housing (2) is used to install the stator assembly (22) and the rotor assembly (24). The permanent magnet housing (3) is made of non-magnetic material and is used to install the shaft end permanent magnet component (31) at the lower end of the rotating shaft (25) in the rotor assembly (24). The impeller housing (4) is used to install the impeller (41). The motor housing (2), the permanent magnet housing (3), and the impeller housing (4) are spatially independent and sealed. The impeller (41) has a wheel end permanent magnet component (45) that is magnetically coupled to the shaft end permanent magnet component (31). The impeller housing (4) or the impeller (41) has a limiting structure to ensure that the impeller (41) rotates coaxially with the rotating shaft (25). The stator assembly (22) is water-sealed in the motor housing (2) using a potting structure.

2. The submersible pump according to claim 1, which effectively avoids scale buildup clogging the rotating mechanism, is characterized in that: The motor housing (2) includes a stator chamber (21) for mounting the stator assembly (22) and a rotor chamber (23) for mounting the rotor assembly (24). The stator chamber (21) and the rotor chamber (23) are two chambers that are sealed and separated from each other. The lower end face of the stator chamber (21) is a closed surface and the upper end face of the stator chamber (21) is an open surface. The stator assembly (22) is fitted onto the outer peripheral wall of the rotor chamber (23). Water sealant is filled into the stator chamber (21). The upper end face of the rotor chamber (23) is a closed surface and the lower end face of the rotor chamber (23) is an open surface. A water sealing seat (33) is provided on the open surface to seal and separate the rotor chamber (23) from the permanent magnet housing (3). The lower end of the shaft (25) passes through the shaft hole in the center of the water sealing seat (33) and extends downward into the permanent magnet housing (3) and is fixedly connected to the shaft end permanent magnet component (31).

3. The submersible pump according to claim 2, which effectively avoids scale buildup clogging the rotating mechanism, is characterized in that: The impeller housing (4) includes a bottom cover plate (46) and a circular cavity wall plate (47) extending upward from the bottom cover plate (46). The impeller (41) is mounted in a wheel chamber enclosed by the cavity wall plate (47). The upper end face of the wheel chamber is open and faces the flat top plate (52) of the outlet pipe housing (5). The inlet (48) of the submersible pump (1) is located on the bottom cover plate (46) where the wheel chamber is located. The outlet (49) of the wheel chamber is located on the cavity wall plate (47) and communicates with the outlet pipe (51) of the submersible pump (1). The outlet pipe (51) is located on the side of the pump housing and extends upward.

4. The submersible pump according to claim 3, which effectively avoids scale buildup clogging the rotating mechanism, is characterized in that: The permanent magnet housing (3) and the water outlet housing (5) are integrally structured. The permanent magnet chamber that houses the shaft end permanent magnet component (31) is located below the water sealing seat (33) and is sealed and separated from the water outlet pipe (51). The water outlet pipe (51) is located on the side of the permanent magnet housing (3). The water inlet of the water outlet pipe (51) is connected to the water outlet (49) on the impeller housing (4).

5. The submersible pump according to claim 4, which effectively avoids scale buildup clogging the rotating mechanism, is characterized in that: The impeller (41) includes blades (42), a disk (43) and a shaft (44). The disk (43) is made of non-magnetic material and has a cavity for accommodating the permanent magnet component (45) at the end of the wheel. The shaft (44) is a semi-circular convex shaft (61) located at the center of the blade (42) and extending downward. The limiting structure includes a convex ball (62) in the shape of a spherical cap on the top panel of the disk (43) and a guide ball groove (63) on the bottom surface of the permanent magnet housing (3). The convex ball (62) is located on the top panel of the disk (43) at a position away from the rotation center of the disk (43). The guide ball groove (63) is annular with a semi-circular cross-section. When the impeller (41) rotates, the convex ball (62) is embedded in the guide ball groove (63) and rotates in a circular motion with the impeller (41).

6. The submersible pump according to claim 3, which effectively avoids scale buildup clogging the rotating mechanism, is characterized in that: The permanent magnet housing (3) is an independent component located between the top panel of the motor housing and the water outlet housing (5). The permanent magnet chamber that houses the shaft end permanent magnet component (31) is located below the water seal seat (33). The impeller housing (4) is fastened from bottom to top to the opening at the lower end of the water outlet housing (5).

7. The submersible pump according to claim 6, which effectively avoids scale buildup clogging the rotating mechanism, is characterized in that: The impeller (41) includes blades (42), a disc (43) and a shaft (44). The disc (43) is made of a non-magnetic material and has a cavity to accommodate the permanent magnet component (45) at the wheel end. The limiting structure is the shaft (44) that passes through the disc (43). The upper end of the shaft (44) is embedded in a recessed shaft cavity (64) at the center of the bottom surface of the top panel, and the lower end of the shaft (44) is embedded in a shaft cup (65) at the center of the bottom plate of the impeller chamber.

8. The submersible pump according to claim 7, which effectively avoids scale buildup clogging the rotating mechanism, is characterized in that: The axle cup (65) is integrated with the bottom cover plate (46) of the wheel chamber, and is connected to other parts of the wheel chamber through the spoke rib plate (7) set on the bottom plate.

9. The submersible pump according to claim 6, which effectively avoids scale buildup clogging the rotating mechanism, is characterized in that: The impeller (41) includes blades (42), a disk (43) and a shaft (44). The disk (43) is made of a non-magnetic material and has a cavity for accommodating the permanent magnet component (45) at the wheel end. The shaft (44) is a semi-circular shaft column located at the center of the blade (42) and extending downward. The limiting structure includes an annular slide (66) located on the side wall of the disk (43) and recessed inward, and a plurality of semi-circular protrusions (67) located on the inner side wall of the wheel cover. The protrusions (67) are embedded in the annular slide (66).

10. The submersible pump according to claim 3, which effectively avoids scale buildup clogging the rotating mechanism, is characterized in that: A cavity for accommodating the lower bearing (28) is provided on the upper surface of the water sealing seat (33). A graphite wear-resistant sheet (34) is provided between the lower bearing (28) and the rotor. The upper bearing (27) located at the upper end of the rotating shaft (25) is placed in the bearing sleeve (26) at the top of the rotor chamber (23).

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