Spherical Pump-Motor Assembly

Abstract

The spherical pump-motor assembly includes a spherical pump (1) and an outer rotor type motor (2). The motor outer rotor (23) of the outer rotor type motor (2) has a cylindrical outer rotor body (231) with an opening facing upward. A magnetic ring (233) is arranged on the inner periphery of the outer rotor body (231). A rotor central axis (232) is provided at the center of the cylindrical bottom surface of the outer rotor body (231). A coil winding (241) is provided on the outer periphery of a stator holder (242) having a central shaft hole. A connecting portion (243) is provided at the upper end of the stator holder (242). The cylinder seat (121) and the connecting portion (243) are fixedly connected. The lower end surface of the turntable shaft (151) and the upper end surface of the rotor central axis (232) mesh together to transmit torque. The present invention has the advantages of being small in volume, fully utilizing the merits of miniaturization of the spherical pump (1), and convenient connection and installation of the outer rotor motor (2) and the spherical pump (1).

Description

[Technical Field]

[0001] The present invention relates to liquid pumps, and more particularly to spherical pump-motor assemblies. [Background technology]

[0002] Spherical pump technology is a recently invented variable displacement power mechanism based on a completely new principle, and has been granted numerous Chinese patents. Its advantages include a small number of pump parts, reliable sealing, no inlet or outlet valves, convenient ultra-miniaturized design, high speed operation, and low noise. Various applications of spherical pumps are currently being researched and developed. For example, in Chinese Patent No. ZL202220285836.0 (titled "Micro Spherical Pump"), its most notable features are its small volume and light weight, making it suitable for applications with strict pump volume restrictions, such as dental Kohler devices, electric toothbrushes with cleaning functions, and portable firefighting equipment. While spherical pumps have a significantly smaller volume than other pumps, because they are new types of water pumps, there are currently no motors that match their volume. Typically, spherical pumps have a small volume, but the corresponding motors are large. As a result, the benefits of spherical pumps' small volume are not fully realized, and the overall need for miniaturized pumps and motors in portable equipment cannot be met. Summary of the Invention

[0003] The objective of this invention is to design a spherical pump-motor assembly that utilizes the latest in spherical pump technology and integrates it with the motor used to minimize the combined volume of the spherical pump and motor.

[0004] The technical means of the present invention are as follows: A spherical pump-motor assembly including a spherical pump and an outer rotor motor, The rotating disk shaft of the spherical pump is rotatably supported by the central hole of a cylinder seat at the bottom of the spherical pump, the motor outer rotor of the outer rotor type motor has a cylindrical outer rotor body with an opening facing upward, a magnetic ring is disposed on the inner circumference of the outer rotor body, and a rotor central axis is provided at the center of the cylindrical bottom of the outer rotor body, and in the motor stator of the outer rotor type motor, a stator holder having a central shaft hole has a coil winding made of multiple groups of coils and magnetic steel disposed on the outer circumference, the rotor central axis is inserted into the central shaft hole of the stator holder to form a rotation pair, the stator holder and the coil winding are located in the annular space between the rotor central axis and the magnetic ring, the upper end of the stator holder protrudes from the upper end of the coil winding to form a connection part, the cylinder seat is fixedly connected to the connection part, the rotating disk shaft and the rotor central axis are coaxial, and the lower end of the rotating disk shaft meshes with the upper end of the rotor central axis to transmit torque, thus forming a spherical pump-motor assembly.

[0005] Furthermore, the connection part is a cylindrical groove with an opening facing upward, and the outer periphery of the cylinder seat fits into the inner periphery of the cylindrical groove of the connection part, and the cylinder seat is inserted into the cylindrical groove of the connection part to form an interference fit, thereby fixedly connecting the spherical pump and the stator holder of the outer rotor type motor.

[0006] Furthermore, a bushing for supporting the rotor central shaft for rotation is provided in the central shaft hole of the stator holder at a portion where the rotor central shaft is fitted.

[0007] Furthermore, the bushing is divided into two sections, upper and lower, and the inner diameter of the bushing is smaller than the diameter of the central axial hole of the stator holder. The bushing is pre-fitted into the central axial hole of the stator holder, and the material of the bushing is copper or other wear-resistant material.

[0008] Furthermore, a semicircular shaft head is provided at the lower end of the turntable shaft, and a semicircular shaft head that meshes with the semicircular shaft head of the turntable shaft is provided on the upper end surface of the rotor central shaft, so that the lower end of the turntable shaft and the upper end of the rotor central shaft are rotatably connected by the meshing of the semicircular shaft heads.

[0009] Furthermore, a cylindrical sleeve is provided on the outer periphery of the meshing portion between the rotating disk shaft and the rotor central shaft, and the sleeve is fixed to cover the upper outer periphery of the semicircular shaft of the rotating disk shaft or fixed to cover the lower outer periphery of the semicircular shaft of the rotor central shaft.

[0010] Furthermore, the lower end of the turntable shaft and the upper end of the rotor central shaft are circular shaft heads, and a sleeve is provided on the outer periphery of the meshing portion between the lower end of the turntable shaft and the upper end of the rotor central shaft. The sleeve is engaged with the circular shaft heads at the lower end of the turntable shaft and the upper end of the rotor central shaft by an interference fit, and the lower end of the turntable shaft and the upper end of the rotor central shaft are rotatably connected by the sleeve.

[0011] Furthermore, the spherical pump includes a cylinder and a cylinder cover, and the cylinder and the cylinder cover are fixedly connected to form a spherical cavity. The fixed connection between the cylinder and the cylinder cover is any one of ultrasonic welding, screw connection, connection with adhesive, and connection with a clamp, and the material of the clamp used for the clamp connection is metal or heat-shrinkable plastic.

[0012] Furthermore, the outer rotor motor further includes a motor protective case, and the upper opening of the motor protective case and the outer periphery of the connection part are fixedly connected in a sealed manner.

[0013] Furthermore, the motor protective case is a cylindrical body with an opening facing upward, and a protective case positioning ring is provided between the inner circumference of the cylindrical body at the opening and the outer circumference of the connection part, and the protective case positioning ring is fixedly connected to the inner circumference of the motor protective case and the outer circumference of the connection part so as to be sealed, respectively, and the shape of the upper end of the protective case positioning ring matches the shape of the lower end of the cylinder of the spherical pump.

[0014] The advantages of the present invention are as follows: 1) The spherical pump is suitable for the outer rotor motor, and the outer rotor motor has a small volume. The stator holder protrudes from the motor to form the connection part, and the connection part is provided with an insert structure, which reduces the axial size of the connection part between the spherical pump and the motor. The pump power unit formed by assembling the spherical pump and the outer rotor motor has a small volume and a compact structure, which can be applied to various situations with strict requirements for volume, and the advantage of the spherical pump's small volume is fully demonstrated. 2) The cylinder seat at the bottom of the spherical pump is tightly fitted into the groove of the connecting part of the outer rotor motor, so no other connecting tools are required and the installation can be completed by simply pressing it in lightly. After installation, the rotor central axis and the rotating disk axis of the spherical pump are directly engaged, which makes it easy to connect and install the spherical pump and outer rotor motor, with high assembly efficiency, high installation precision, and small motor power loss. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic diagram of the outer structure of a spherical pump-motor assembly according to the present invention; FIG. [Figure 2] 2 is a cross-sectional view taken along the line AA in FIG. 1. [Figure 3] FIG. 3 is a cross-sectional view taken along the line DD in FIG. 2. [Figure 4] FIG. 2 is a schematic diagram of the three-dimensional structure of the shoe seat of a spherical pump. [Figure 5] FIG. 2 is a schematic diagram of the three-dimensional structure of a cylinder cover of a spherical pump. [Figure 6] FIG. 2 is a schematic diagram of the three-dimensional structure of a cylinder of a spherical pump. [Figure 7] FIG. 1 is a structural schematic diagram in which a cylinder and a cylinder cover are fixedly connected by a clamp. [Figure 8] FIG. 2 is a schematic diagram of the three-dimensional structure of a clamp. [Figure 9] FIG. 2 is a schematic diagram of the three-dimensional structure of a piston of a spherical pump. [Figure 10]FIG. 2 is a schematic diagram of the three-dimensional structure of the rotating disk of the spherical pump.

[0016] Explanation of symbols 1 - spherical pump; 11 - cylinder cover; 111 - water inlet; 112 - drain; 113 - shoe seat hole; 114 - water inlet tank; 115 - drain tank; 12 - cylinder; 121 - cylinder seat; 13 - retaining ring; 14 - seal ring; 15 - turntable; 151 - turntable shaft; 152 - turntable pin boss; 16 - O-ring; 17 - piston; 171 - shoe; 172 - piston pin boss; 18 - shoe seat; 19 - clamp; 100 - operating cavity; 2 - outer rotor type motor; 21 - motor protective case; 22 - protective case positioning ring; 23 - motor outer rotor; 231 - outer rotor body; 232 - rotor central shaft; 233 - magnetic ring; 24 - motor stator; 241 - coil winding; 242 - stator holder; 243 - connection part; 25 - bushing; 3-Sleeve. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present invention will be described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific examples described herein are merely for the purpose of illustrating the present invention, and are not intended to limit the present invention.

[0018] As shown in Figures 1 to 3, the spherical pump-motor assembly according to the present invention can be applied to a scaler as a power unit. The rotary disk shaft 151 of the spherical pump 1 is rotatably supported by the central hole of the cylinder seat 121 at the bottom of the spherical pump 1 as the power input shaft of the spherical pump 1. As shown in Figures 6 and 10, the cylinder seat 121 is a cylinder protruding from the bottom end of the cylinder 12 of the spherical pump 1, which is a rotary support for the rotary disk shaft 151 and also a connector between the spherical pump 1 and the outer rotor motor 2.

[0019] The outer rotor motor 2 of the present invention is designed to satisfy the electrical performance requirements of the spherical pump 1 relative to the motor volume, and to be structurally compatible with the spherical pump 1. The outer rotor motor 2 includes a motor outer rotor 23, a motor stator 24, and a motor protective case 21. The motor outer rotor 23 of the outer rotor motor 2 has a cylindrical outer rotor body 231 with an upward opening. A magnetic ring 233 consisting of multiple groups of magnets is fixed to the inner periphery of the outer rotor body 231. A rotor center shaft 232 is fixedly provided at the center of the cylindrical bottom surface of the outer rotor body 231. The magnetic ring 233 and the rotor center shaft 232 rotate synchronously with the outer rotor body 231. The motor stator 24 includes a stator holder 242 and multiple coil windings 241 made of multiple groups of coils and magnetic steel arranged on the outer periphery of the stator holder 242. In the present invention, there are nine groups of coil windings 241, which are uniformly distributed around the periphery of the stator holder 242, thereby forming the motor stator 24. A central axial hole penetrating vertically is provided at the center of the stator holder 242. The rotor central shaft 232 is inserted into the central axial hole of the stator holder 242 from its lower end. The stator holder 242 and the coil windings 241 are located in the annular space between the rotor central shaft 232 and the magnetic ring 233 of the outer rotor. The outer diameter of the rotor central shaft 232 matches the diameter of the central axial hole of the stator holder 242. A revolute pair is formed within the central axial hole of the stator holder 242.

[0020] The upper end of the stator holder 242 protrudes from the upper end of the coil winding 241 to form a connecting portion 243. The connecting portion 243 is a cylindrical groove with an upward opening and is used to connect to the spherical pump 1. The outer periphery of the cylinder seat 121 of the spherical pump 1 fits into the inner periphery of the groove of the connecting portion 243. The cylinder seat 121 is positioned in the groove of the connecting portion 243 to form an interference fit, thereby fixedly connecting the spherical pump 1 and the stator holder 241 of the outer rotor motor 2. The connecting portion 243 may be an independent part fixedly connected to the upper end of the stator holder 242, or may be designed integrally with the stator holder 242 so as to be an upwardly extending part of the stator holder 242. After the cylinder seat 121 and the connecting portion 243 are fixedly connected, the rotating disk shaft 151 and the rotor central shaft 232 become coaxial, and the lower end surface of the rotating disk shaft 151 and the upper end surface of the rotor central shaft 232 mesh with each other to transmit torque, thereby causing the outer rotor motor 2 to operate the spherical pump 1.

[0021] The engagement between the lower end surface of the turntable shaft 151 and the upper end surface of the rotor central shaft 232 can be achieved in various ways. For example, it can be achieved by a spline connection. That is, male and female splines are provided on the lower end surface of the turntable shaft 151 and the upper end surface of the rotor central shaft 232, respectively, and the connection is achieved by spline engagement. The connection can also be achieved by meshing a square shaft head with a square hole. In this embodiment, torque is transmitted using a semicircular shaft head. As shown in FIG. 7, a semicircular shaft head is provided on the lower end of the turntable shaft 151, and a semicircular shaft head that matches the semicircular shaft head of the turntable shaft 151 is provided on the upper end of the rotor central shaft 232. The turntable shaft 151 and the rotor central shaft 232 mesh with each other via the flat shaft portion of the semicircular shaft head to form a rotational connection and transmit torque. To ensure a more accurate and reliable connection of the semicircular shaft head, a cylindrical sleeve 3 is further provided on the outer periphery of the portion of the turntable shaft 151 that meshes with the rotor central shaft 232. The sleeve 3 either fixes and covers the upper outer periphery of the semicircular shaft of the turntable shaft 151, or fixes and covers the lower outer periphery of the semicircular shaft head of the rotor central shaft. The lower end of the turntable shaft 151 and the upper end of the rotor central shaft 232 may be rotationally connected by the sleeve 3 being tightly fitted into the semicircular shaft heads at both ends. This connection method does not require the fabrication of semicircular shaft heads at the lower end of the turntable shaft 151 and the upper end of the rotor central shaft 232, making the connection simple and convenient.

[0022] In order to reduce rotational friction between the rotor central shaft 232 and the central axial hole of the stator holder 242, thereby reducing power consumption and wear, a bushing 25 is provided at the fitting point between the central axial hole of the stator holder 242 and the rotor central shaft 232 to support the rotation of the rotor central shaft 232. The bushing 25 is made of copper or other wear-resistant material. The bushings 25 are arranged in two tiers, upper and lower. The diameter of the inner hole of the bushing 25 is slightly smaller than the diameter of the central axial hole of the stator holder 242. The bushing 25 may be fitted into the central axial hole of the stator holder 242 beforehand.

[0023] To prevent water from entering the motor and protect it, the outer rotor motor 2 further includes a motor protective case 21. The opening at the top of the motor protective case 21 is fixedly and sealingly connected to the outer periphery of the connecting portion 243. The motor protective case 21 is a cylindrical body with an upward opening. The cylindrical body is shaped like a bucket. A protective case positioning ring 22 is provided between the inner periphery of the opening of the cylindrical body and the outer periphery of the connecting portion 243. The protective case positioning ring 22 is fixedly and sealingly connected to the inner periphery of the motor protective case 21 and the outer periphery of the connecting portion 243, respectively. During actual production, the protective case positioning ring 22 is pressed between the inner periphery of the upper opening of the motor protective case 21 and the outer periphery of the connecting portion 243 by an interference fit. The shape of the upper end of the protective case positioning ring 22 matches the arc-shaped lower end of the cylinder 12 of the spherical pump 1.

[0024] In the present invention, a micro-spherical pump is used as the spherical pump 1. As shown in FIGS. 2, 4 to 10, the spherical pump 1 includes a cylinder cover 11, a cylinder 12, a rotating disk 15, a piston 17, and a shoe seat 18. The cylinder 12 and the cylinder cover 11 form a hemispherical cavity. The cylinder 12 and the cylinder cover 11 are fixedly connected to form the spherical cavity. The hemispherical cavity of the cylinder cover 11 is provided with a shoe seat hole 113, a water inlet tank 114, and a drain tank 115. A water inlet 111 and a drain port 112 are provided on the outer wall at the upper end of the cylinder cover 11. The water inlet 111 is connected to the water inlet tank 114, and the drain port 112 is connected to the drain tank 115. The water inlet 111 and the drain port 112 are used to connect to the water tank and nozzle of a scaler, respectively. The shoe seat hole 113 is provided at the center of the spherical surface of the hemispherical cavity. The axis of the shoe seat hole 113 is perpendicular to the end face of the hemispherical cavity of the cylinder cover 11, and this end face has a protruding positioning ring for positioning when connected to the end face of the cylinder 12.

[0025] A cylinder seat 121 is fixedly connected to the lower end of the cylinder 12. The cylinder seat 121 is integrally connected to the cylinder 12. A central hole is provided within the cylinder seat 121, connecting the spherical surface of the hemispherical cavity of the cylinder to the outside of the cylinder. This central hole supports the rotation of the turntable shaft 151. The angle α between the axis of the central hole and the end face of the hemispherical cavity of the cylinder 12 is defined as α. α ranges from 5 to 20 degrees, but in this embodiment, α is preferably 15 degrees. Positioning structures and connection flanges are provided on the end faces of the hemispherical cavities of the cylinder 12 and cylinder cover 11. A protruding positioning ring is provided on the end face of the cylinder cover 11, and a matching positioning groove is provided on the end face of the cylinder 12. An O-ring 16 is provided at the end face connection between the cylinder 112 and the cylinder cover 111. The cylinder 12 and the cylinder cover 11 may be fixedly connected by screws, by ultrasonic welding after positioning using a positioning structure, or by direct bonding with an adhesive. In FIGS. 1 and 2, the cylinder 12 and the cylinder cover 11 may be fixed by ultrasonic welding or adhesive bonding. The cylinder 12 and the cylinder cover 11 may also be fixed by a clamp 19. As shown in FIGS. 7 and 8, the structure of the cylinder 12 and the cylinder cover 11 is the same as above, except for the addition of the clamp 19. The clamp 19 is cylindrical before installation, and the inner diameter of the cylinder matches the outer diameter of the connecting flange of the cylinder 12 and the cylinder cover 11. When installed, the clamp 19 engages the outer periphery of the connecting flange of the cylinder 12 and the cylinder cover 11, and then the upper and lower ends of the flange are crimped to form a crimp. The contraction force generated by the crimping securely connects the cylinder 12 and the cylinder cover 11. The clamp 19 shown in FIG. 8 has both ends crimped (closed) to form a crimped structure. The clamp 19 may be made of a metal material. After the metal clamp 19 is fitted onto the outer periphery of the connecting flange of the cylinder 12 and the cylinder cover 11, portions of the clamp 19 located on both the upper and lower surfaces of the connecting flange are deformed to form hem bends, i.e., the upper and lower surfaces of the connecting flange are narrowed. The clamp 19 may also be made of a heat-shrinkable material.After the clamp 19 is shrunk, the material deforms and shrinks as the temperature drops, automatically forming a narrowed opening on both the top and bottom of the connecting flange, which locks the connecting flange and securely connects the cylinder 12 and the cylinder cover 11. To further improve the sealing at the connection between the cylinder 12 and the cylinder cover 11, a sealant can be applied to the inside of the clamp 19 before it is installed and fixed.

[0026] As shown in Figures 2 and 9, piston 17 includes a spherical surface, two angled side surfaces, and a piston pin boss 172 located below the two side surfaces. A shoe 171 protrudes from the center of the spherical surface of the piston. A piston pin boss 172 is located below the spherical surface of the piston. Piston pin boss 172 is a semi-cylindrical structure protruding from both sides of the piston, and both ends of the semi-cylinder are spherical. Shoe 171 has two flat surfaces. These two flat surfaces are operating surfaces. These two operating surfaces are symmetrically located on either side of the semi-cylindrical axis of piston pin boss 172. The axis of the semi-cylindrical axis of piston pin boss 172 is parallel to the two flat surfaces of shoe 171.

[0027] As shown in Figures 2 and 10, the upper end of the turntable 15 is flat. A semi-cylindrical hole recessed inward is formed as the turntable pin boss 152 on the flat surface of the upper end. A turntable shaft 151 protrudes from the center of the lower part of the turntable 15. The area between the upper end surface of the turntable 15 and the turntable shaft 151 at the lower end is a spherical surface of the turntable. The turntable pin boss 152 and the piston pin boss 172 can be fitted together. The semi-cylindrical part of the piston pin boss 172 is inserted into the semi-cylindrical hole of the turntable pin boss 152 to form a hinge structure with a C-shaped cylindrical surface.

[0028] As shown in FIG. 4 , the shoe seat 18 is cylindrical. A chute 181 is provided on the lower end surface of the cylinder. The width of the chute 181 matches the distance between the two parallel operating surfaces of the shoe 171 on the piston. The length of the chute 181 need only be long enough for the shoe 171 to slide back and forth within the chute 181 with each rotation of the turntable shaft 1511. The length of the chute 181 may be long enough to penetrate the lower end surface of the shoe seat 18, or it may be long enough for the shoe 171 to slide back and forth without penetrating. The outer diameter of the shoe seat 18 matches the diameter of the shoe hole 11 in the cylinder cover 11. The shoe seat 18 is located within the shoe seat hole 113. The lower end surface of the shoe seat 18 does not protrude from the inner spherical surface of the spherical cavity. The axis of the shoe seat 18 overlaps the axis of the shoe seat hole 113. The shoe seat 18 is free to rotate around its axis within the shoe seat hole 113. In order to reduce friction between the upper end surface of the shoe seat 18 and the bottom surface of the shoe seat hole 113, a process groove is provided on the upper end surface of the shoe seat 18, and a process hole is provided between the process groove and the bottom of the chute 181, which makes installation easier.

[0029] A stop ring 13 and a seal ring 14 are provided on the mating surfaces of the turntable shaft 151 and the central hole of the cylinder seat 121. The turntable shaft 151 fits into the central hole of the cylinder seat 121. The turntable shaft 151 is a stepped shaft, and the central hole of the cylinder seat 121 is a corresponding stepped hole. A seal ring 14 is provided on the journal at the upper end of the turntable shaft 151 to prevent water from entering the motor. The stop ring 13 is used to prevent the seal ring 14 from moving and to form rotational support. A half shaft head or a circular shaft head is provided at the lower end of the turntable shaft 151 to connect to the output shaft of the power mechanism to transmit power.

[0030] The axis of the shoe seat hole 113 on the inner spherical surface of the cylinder cover 11 and the axis of the central hole of the cylinder seat 121 both pass through the center of the spherical cavity, and the included angle between the axis of the shoe seat hole 113 and the axis of the central hole of the cylinder seat 121 is α. The piston 17 and the rotating disk 15 are connected by a cylindrical hinge and then placed in the spherical cavity. The spherical surfaces of the piston, the rotating disk, and the spherical cavity share the same spherical center and form a sealed movable fit, and the mating surfaces of the cylindrical hinge form a sealed movable fit. A shoe 171 on the upper end of the piston 17 is placed in a chute 181 on the lower end surface of the shoe seat 18, and the two parallel surfaces of the shoe 171 are in close contact with both sides of the chute 181 to form a sliding fit. The shoe 171 slides back and forth within the chute 181, forming a chute oscillation mechanism and driving the rotation of the rotating disk shaft 151. The piston 17 and the rotating disk 15 swing relatively around a cylindrical hinge. The shoe 171 slides back and forth within the chute 181. As a result, two operating cavities 100 with alternately changing volumes are formed between the upper end surface of the rotating disk 15, both side surfaces of the piston 17, and the spherical cavity.

[0031] In this embodiment, the spherical cavity of the spherical pump 1 has a spherical diameter of 13 mm, and the diameter of the outer rotor motor 2 and the spherical pump 1 is only 19 mm. The overall length after assembly is 51 mm or less, so that the volume of the pump power unit combining the spherical pump 1 and the motor is smaller. This significantly reduces the size of the scaler and improves its quality when used in a scaler product.

Claims

1. A spherical pump-motor assembly comprising a spherical pump (1) and an outer rotor motor (2), The rotating disk shaft (151) of the spherical pump (1) is rotatably supported by a central hole of a cylinder seat (121) at the bottom of the spherical pump (1), the motor outer rotor (23) of the outer rotor type motor (2) has a cylindrical outer rotor body (231) with an opening facing upward, a magnetic ring (233) is arranged on the inner periphery of the outer rotor body (231), a rotor central axis (232) is provided at the center of the bottom surface of the cylinder of the outer rotor body (231), and in the motor stator (24) of the outer rotor type motor (2), a coil winding (241) made of multiple groups of coils and magnetic steel is arranged on the outer periphery of a stator holder (242) having a central axis hole. a rotor central shaft (232) inserted into a central axial hole of a stator holder (242) to form a rotational pair; the stator holder (242) and the coil winding (241) located in an annular space between the rotor central shaft (232) and a magnetic ring (233); the upper end of the stator holder (242) protrudes from the upper end of the coil winding (241) to form a connecting part (243); the cylinder seat (121) is fixedly connected to the connecting part (243); the turntable shaft (151) and the rotor central shaft (232) are coaxial; and the lower end of the turntable shaft (151) meshes with the upper end of the rotor central shaft (232) to transmit torque.

2. 2. The spherical pump-motor assembly according to claim 1, wherein the connecting portion (243) is a cylindrical groove with an opening facing upward, the outer periphery of the cylinder seat (121) fits into the inner periphery of the cylindrical groove of the connecting portion (243), and the cylinder seat (121) is inserted into the cylindrical groove of the connecting portion (243) to form an interference fit, thereby fixedly connecting the spherical pump (1) and the stator holder (242) of the outer rotor type motor (2).

3. 2. The spherical pump-motor assembly according to claim 1, wherein a bushing (25) for rotationally supporting the rotor central shaft (232) is provided in a central axial hole of the stator holder (242) at a portion that fits with the rotor central shaft (232).

4. 4. The spherical pump-motor assembly according to claim 3, wherein the bushing (25) is divided into two sections, an upper section and an lower section, the inner diameter of the bushing (25) is smaller than the diameter of the central axial hole of the stator holder (242), the bushing (25) is fitted into the central axial hole of the stator holder (242) in advance, and the bushing (25) is made of copper or other wear-resistant material.

5. The spherical pump-motor assembly of claim 1, wherein a semicircular shaft head is provided at the lower end of the turntable shaft (151), and a semicircular shaft head that meshes with the semicircular shaft head of the turntable shaft (151) is provided at the upper end surface of the rotor central shaft (232), and the lower end of the turntable shaft (151) and the upper end of the rotor central shaft (232) are rotatably connected by the meshing of the semicircular shaft heads.

6. The spherical pump-motor assembly according to claim 5, wherein a cylindrical sleeve (3) is provided on the outer periphery of the meshing portion between the turntable shaft (151) and the rotor central shaft (232), and the sleeve (3) is fixed to cover the upper outer periphery of the semicircular shaft of the turntable shaft (151) or fixed to cover the lower outer periphery of the semicircular shaft of the rotor central shaft (232).

7. 2. The spherical pump-motor assembly according to claim 1, wherein the lower end of the turntable shaft (151) and the upper end of the rotor central shaft (232) are circular shaft heads, a sleeve (3) is provided on the outer periphery of the meshing portion between the lower end of the turntable shaft (151) and the upper end of the rotor central shaft (232), the sleeve (3) is engaged with the circular shaft heads at the lower end of the turntable shaft (151) and the upper end of the rotor central shaft (232) by an interference fit, and the lower end of the turntable shaft (151) and the upper end of the rotor central shaft (232) are rotatably connected by the sleeve (3).

8. 2. The spherical pump-motor assembly according to claim 1, wherein the spherical pump (1) includes a cylinder (12) and a cylinder cover (11), the cylinder (12) and the cylinder cover (11) are fixedly connected to form a spherical cavity, the fixed connection between the cylinder (12) and the cylinder cover (11) is any one of ultrasonic welding, screw connection, connection with an adhesive, and connection with a clamp, and the material of the clamp (19) used for the clamp connection is metal or heat-shrinkable plastic.

9. 2. The spherical pump-motor assembly according to claim 1, wherein the outer rotor motor (2) further includes a motor protective case (21), and an upper end opening of the motor protective case (21) and an outer periphery of the connection portion (243) are fixedly connected in a sealing manner.

10. 10. The spherical pump-motor assembly according to claim 9, wherein the motor protective case (21) is a cylindrical body with an opening facing upward, and a protective case positioning ring (22) is provided between the inner periphery of the opening of the cylindrical body and the outer periphery of the connecting part (243), and the protective case positioning ring (22) is fixedly connected to the inner periphery of the motor protective case (21) and the outer periphery of the connecting part (243) in a sealing manner, respectively, and the shape of the upper end of the protective case positioning ring (22) matches the shape of the lower end of the cylinder (12) of the spherical pump (1).

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