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 a liquid pump, and particularly to a spherical pump-motor assembly.

Background Art

[0002] Spherical pump technology is a newly invented variable displacement power mechanism with a completely new principle in recent years. There are many Chinese patents. Its advantages are that the number of pump parts is small, sealing is reliable, there is no liquid feeding or discharging valve, it is convenient for ultra-small design, high-speed operation can be achieved, and noise is low. Currently, various applications of spherical pumps are being researched and developed. For example, in Chinese Patent No. ZL202220285836.0 (invention name "Micro Spherical Pump"), the most prominent feature is its small volume and light weight, which can be applied when there are strict restrictions on the volume of pumps such as dental curers, electric toothbrushes with cleaning functions, and portable fire-fighting equipment. Although the spherical pump is significantly smaller in volume compared to other pumps, since the spherical pump is a new type of water pump, currently there is no motor that matches the volume of the spherical pump. Usually, the volume of the spherical pump is small, but the volume of the motor that matches it is large. As a result, the advantage of the small volume of the spherical pump cannot be fully exerted, and it cannot meet the needs of overall miniaturization of pumps and motors for portable equipment.

Summary of the Invention

[0003] The object of the present invention is to design a spherical pump-motor assembly. By utilizing the latest spherical pump technology that has been invented and put into practical use, and integrating it with the motor used therein, the volume after combining the spherical pump and the motor is minimized.

[0004] The technical means of the present invention are as follows. A spherical pump-motor assembly including a spherical pump and an outer rotor type motor, The spherical pump-motor assembly is configured such that the rotating disk shaft of the spherical pump is rotatably supported by a central hole in a cylinder seat located 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 upward-facing opening, a magnetic ring is arranged on the inner circumference of the outer rotor body, a rotor central axis is provided at the center of the bottom surface of the cylinder of the outer rotor body, and in the motor stator of the outer rotor type motor, a coil winding made of multiple groups of coils and magnetic steel is provided on the outer circumference of a stator holder having a central axis hole, the rotor central axis is inserted into the central axis hole of the stator holder to form a rotating pair, the stator holder and coil winding are located in an 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, the cylinder seat is fixedly connected to the connection, 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.

[0005] Furthermore, the connecting portion is a cylindrical groove with an upward-facing opening, and the outer circumference of the cylinder seat fits into the inner circumference of the cylindrical groove of the connecting portion. The cylinder seat is inserted into the cylindrical groove of the connecting portion to form an interlocking fit, thereby fixing the spherical pump and the stator holder of the outer rotor type motor together.

[0006] Furthermore, a bushing is provided in the portion of the stator holder's central shaft hole that engages with the rotor's central shaft, for rotatably supporting the rotor's central shaft.

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

[0008] Furthermore, a semicircular shaft head is provided at the lower end of the rotating disc shaft, and a semicircular shaft head that engages with the semicircular shaft head of the rotating disc shaft is provided at the upper end surface of the rotor central shaft, so that the lower end of the rotating disc shaft and the upper end of the rotor central shaft are rotatably connected by the engagement of the semicircular shaft heads.

[0009] Furthermore, a cylindrical sleeve is provided on the outer circumference of the meshing portion between the rotating disc shaft and the rotor central shaft. The sleeve either fixes and covers the upper outer circumference of the semicircular shaft of the rotating disc shaft, or fixes and covers the lower outer circumference of the semicircular shaft of the rotor central shaft.

[0010] Furthermore, the lower end of the rotor shaft and the upper end of the rotor central shaft are cylindrical heads, and sleeves are provided on the outer circumference of the meshing portion between the lower end of the rotor shaft and the upper end of the rotor central shaft. The sleeves engage with the cylindrical heads of the lower end of the rotor shaft and the upper end of the rotor central shaft by interference fit, and the lower end of the rotor shaft and the upper end of the rotor central shaft are rotatably connected by the sleeves.

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

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

[0013] Furthermore, the motor protection case is a cylindrical body with an upward-facing opening, and a protective case positioning ring is provided between the inner circumference of the opening of the cylindrical body and the outer circumference of the connection part. The protective case positioning ring is fixedly connected to the inner circumference of the motor protection case and the outer circumference of the connection part, respectively, so as to seal them together, and the shape of the upper end of the protective case positioning ring conforms to the shape of the lower end of the cylinder of the spherical pump.

[0014] The advantages of this invention are as follows. 1) The spherical pump is compatible with the outer rotor motor, which has a small volume. The stator holder protrudes from the motor to form a connection point, and a fit-type structure is provided at the connection point. This reduces the axial size of the connection point between the spherical pump and the motor, resulting in a small volume for the pump power unit assembled from the spherical pump and the outer rotor motor. The structure is compact and can be applied to various situations where volume requirements are strict, fully demonstrating the advantage of the small volume of the spherical pump. 2) The cylinder seat at the lower end of the spherical pump is fitted into the groove of the outer rotor motor's connection part by an interlocking fit, eliminating the need for other connectors. Installation can be completed by simply pushing it in lightly. Furthermore, after installation, the rotor's central axis and the spherical pump's rotating disc axis mesh directly, making the connection and installation of the spherical pump and outer rotor motor convenient, resulting in high assembly efficiency, high installation accuracy, and low motor power loss. [Brief explanation of the drawing]

[0015] [Figure 1] This is a schematic diagram illustrating the external structure of the spherical pump-motor assembly described in the present invention. [Figure 2] This is a cross-sectional view AA in Figure 1. [Figure 3] Figure 2 is a cross-sectional view of the DD. [Figure 4] This is a schematic diagram of the three-dimensional structure of the shoe seat of a spherical pump. [Figure 5] This is a schematic diagram of the three-dimensional structure of the cylinder cover of a spherical pump. [Figure 6] This is a schematic diagram of the three-dimensional structure of a spherical pump cylinder. [Figure 7] This is a schematic diagram showing a structure in which a cylinder and a cylinder cover are fixedly connected by a clamp. [Figure 8] This is a schematic diagram of the three-dimensional structure of a clamp. [Figure 9] This is a schematic diagram of the three-dimensional structure of a piston in a spherical pump. [Figure 10]It is a three-dimensional structural schematic diagram of the rotating disk of a spherical pump.

[0016] Explanation of symbols 1 - Spherical pump; 11 - Cylinder cover; 111 - Water inlet; 112 - Drain outlet; 113 - Shoe seat hole; 114 - Water inlet tank; 115 - Drain tank; 12 - Cylinder; 121 - Cylinder sheet; 13 Stop ring; 14 - Seal ring; 15 - Rotating disk; 151 - Rotating disk shaft; 152 - Rotating disk 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 protection case; 22 - Protection case positioning ring; 23 - Motor outer rotor; 231 - Outer rotor body; 232 - Rotor central axis; 233 - Magnetic ring; 24 - Motor stator; 241 - Coil winding; 242 - Stator holder; 243 - Connection part; 25 - Bushing; 3 - Sleeve.

Embodiment for carrying out the invention

[0017] Hereinafter, the present invention will be described in detail with reference to the drawings and specific embodiments. As can be understood, the specific embodiments described in this specification are only for interpreting the present invention and do not limit the present invention.

[0018] As shown in FIGS. 1 to 3, the spherical pump-motor assembly described in the present invention can be applied to a scaler as a power unit. The rotating disk shaft 151 of the spherical pump 1 is rotationally supported by the central hole of the cylinder sheet 121 at the lower part of the spherical pump 1 as the power input shaft of the spherical pump 1. As shown in FIGS. 6 and 10, the cylinder sheet 121 is a cylinder protruding from the lower end of the cylinder 12 of the spherical pump 1 and is the rotational support portion of the rotating disk shaft 151, and is also a connector between the spherical pump 1 and the outer rotor type motor 2.

[0019] The outer rotor type motor 2 of the present invention is designed to satisfy the electrical performance requirements of the spherical pump 1 and to be structurally compatible with the spherical pump 1, based on the requirements of the spherical pump 1 for the volume of the motor. The outer rotor type 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 type motor 2 has a cylindrical outer rotor body 231 with an upward-facing opening. A magnetic ring 233 consisting of multiple groups of magnets is fixed to the inner circumference of the outer rotor body 231. A rotor central axis 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 central axis 232 rotate synchronously with the outer rotor body 231. The motor stator 24 includes a stator holder 242 and multiple coil windings 241 consisting of multiple groups of coils and magnetic steel arranged on the outer circumference of the stator holder 242. In this invention, there are nine groups of coil windings 241, which are uniformly distributed around the outer circumference of the stator holder 242, thereby constituting the motor stator 24. A central shaft hole is provided in the center of the stator holder 242, penetrating vertically. The rotor central shaft 232 is inserted into the central shaft 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 shaft hole of the stator holder 242. A rotational pair is formed within the central shaft 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 connection part 243. The connection part 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 sheet 121 of the spherical pump 1 conforms to the inner periphery of the groove of the connection part 243. The cylinder sheet 121 is located in the groove of the connection part 243 to form an interference fit, whereby the spherical pump 1 and the stator holder 241 of the outer rotor type motor 2 are fixedly connected. The connection part 243 may be fixedly connected to the upper end of the stator holder 242 as an independent part, or may be integrally designed with the stator holder 242 so as to be a part extending upward in the stator holder 242. After the cylinder sheet 121 and the connection part 243 are fixedly connected, the rotary disk shaft 151 and the rotor center shaft 232 are coaxial, and the lower end surface of the rotary disk shaft 151 and the upper end surface of the rotor center shaft 232 mesh with each other to transmit torque, whereby the outer rotor type motor 2 operates the spherical pump 1.

[0021] The meshing between the lower end surface of the rotor shaft 151 and the upper end surface of the rotor central shaft 232 can be achieved by various methods. For example, it can be achieved by connecting splines. That is, a male spline and a female spline are provided on the lower end surface of the rotor shaft 151 and the upper end surface of the rotor central shaft 232, respectively, and they are connected by the meshing of the splines. They may also be connected by the meshing of a square shaft head and a square hole. In this embodiment, torque is transmitted by a semicircular shaft head. As shown in Figure 7, a semicircular shaft head is provided at the lower end of the rotor shaft 151, and a semicircular shaft head that fits the semicircular shaft head of the rotor shaft 232 is provided at the upper end of the rotor central shaft 232, and the rotor shaft 151 and the rotor central shaft 232 mesh via the flattened shaft portion of the semicircular shaft head to form a rotational connection and transmit torque. To ensure more accurate and reliable connection of the semicircular shaft head, a cylindrical sleeve 3 is provided on the outer circumference of the portion of the rotor shaft 151 that engages with the rotor central shaft 232. The sleeve 3 either fixes and covers the upper outer circumference of the semicircular shaft of the rotor shaft 151, or fixes and covers the lower outer circumference of the semicircular shaft head of the rotor central shaft. The lower end of the rotor shaft 151 and the upper end of the rotor central shaft 232 may be connected by the sleeve 3 interlocking with the cylindrical shaft heads at both ends. In this connection method, there is no need to manufacture semicircular shaft heads at the lower end of the rotor shaft 151 and the upper end of the rotor central shaft 232, making connection simple and operation convenient.

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

[0023] To prevent water from entering the motor and to protect it, the outer rotor type motor 2 further includes a motor protection case 21. The opening at the upper end of the motor protection case 21 is fixedly connected to the outer circumference of the connection part 243 so as to seal it. Furthermore, the motor protection case 21 is a cylindrical body with an upward-facing opening. The cylindrical body is bucket-shaped. A protection case positioning ring 22 is provided between the inner circumference of the opening of the cylindrical body and the outer circumference of the connection part 243. The protection case positioning ring 22 is fixedly connected to the inner circumference of the motor protection case 21 and the outer circumference of the connection part 243 so as to seal it. In actual production, the protection case positioning ring 22 is pressed between the inner circumference of the upper end opening of the motor protection case 21 and the outer circumference of the connection part 243 by an interference fit. The shape of the upper end of the protection case positioning ring 22 conforms to the arc shape of the lower end of the cylinder 12 of the spherical pump 1.

[0024] In the present invention, the spherical pump 1 uses a micro-spherical pump. As shown in Figures 2, 4 to 10, the spherical pump 1 includes a cylinder cover 11, a cylinder 12, a rotating disc 15, a piston 17, and a shoe seat 18. The cylinder 12 and the cylinder cover 11 have 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, an inlet tank 114, and a drain tank 115. The outer wall of the upper end of the cylinder cover 11 is provided with an inlet 111 and a drain port 112. The inlet 111 communicates with the inlet tank 114, and the drain port 112 communicates with the drain tank 115. The inlet 111 and the drain port 112 are used to connect to the scaler's water tank and nozzle, respectively. The shoe seat hole 113 is located at the spherical center 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, which has a projecting 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 inside the cylinder seat 121, which communicates from the spherical surface of the hemispherical cavity of the cylinder to the outside of the cylinder. This central hole serves as rotational support for the rotating disc shaft 151. The angle between the axis of the central hole and the end face of the hemispherical cavity of the cylinder 12 is α. The range of α is 5 to 20 degrees, but in this embodiment, α is preferably 15 degrees. Positioning structures and connecting flanges are provided on the end faces of the hemispherical cavities of the cylinder 12 and the cylinder cover 11. A protruding positioning ring is provided on the end face of the cylinder cover 11, and a positioning groove that matches it is provided on the end face of the cylinder 12. An O-ring 16 is provided at the end face connection point between the cylinder 112 and the cylinder cover 111. The cylinder 12 and cylinder cover 11 may be fixedly connected by screws, positioned by a positioning structure and then fixedly connected by ultrasonic welding, or fixedly connected by direct bonding with adhesive. In Figures 1 and 2, the cylinder 12 and cylinder cover 11 may be fixed by ultrasonic welding or bonding with adhesive. The cylinder 12 and cylinder cover 11 may also be connected by fixing with a clamp 19. As shown in Figures 7-8, the structure of the cylinder 12 and cylinder cover 11 is the same as above, except for the addition of a 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 cylinder cover 11. When the clamp 19 is installed, its inner circumference engages with the outer circumference of the connecting flange of the cylinder 12 and cylinder cover 11, and then the top and bottom sides of the flange are constricted to form a bent edge, and the contraction force when constricting fixes the cylinder 12 and cylinder cover 11 together. The clamp 19 shown in Figure 8 is constricted (closed) at both ends to form a bent edge structure. The clamp 19 may be made of metal. After fitting the metal clamp 19 onto the outer circumference of the connecting flange between the cylinder 12 and the cylinder cover 11, the parts of the clamp 19 located on both the upper and lower surfaces of the connecting flange are deformed to form edge bends, that is, the upper and lower surfaces of the connecting flange are narrowed. The clamp 19 may also be made of heat-shrinkable material.After the clamp 19 is shrink-fitted, the material deforms and shrinks as the temperature decreases, automatically forming a constriction on both the upper and lower sides of the connecting flange, thereby locking the connecting flange and securely connecting the cylinder 12 and the cylinder cover 11. To further improve the sealing at the connection point between the cylinder 12 and the cylinder cover 11, sealant can be applied to the inside of the clamp 19 before it is installed and secured.

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

[0027] As shown in Figures 2 and 10, the upper end of the turntable 15 is flat. On the flat surface of the upper end, a semi-cylindrical hole is formed by recessing inward, forming the turntable pin boss 152. The 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 lower end of the turntable shaft 151 is spherical. The turntable pin boss 152 and the piston pin boss 172 are interlocking. 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 C-shaped hinge structure.

[0028] As shown in Figure 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 corresponds to the distance between the two parallel operating surfaces of the shoe 171 on the piston. The length of the chute 181 should be sufficient for the shoe 171 to reciprocate within the chute 181 each time the rotating disc shaft 1511 rotates. The length of the chute 181 may or may not penetrate the lower end surface of the shoe seat 18, as it may be sufficient for the shoe 171 to reciprocate. The outer diameter of the shoe seat 18 corresponds to 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 coincides with the axis of the shoe seat hole 113. The shoe seat 18 is freely rotatable about its axis within the shoe seat hole 113. 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 that penetrates between the process groove and the bottom of the chute 181, thereby facilitating installation.

[0029] A retaining ring 13 and a seal ring 14 are provided on the mating surfaces of the rotating disc shaft 151 and the central hole of the cylinder seat 121. The rotating disc shaft 151 fits into the central hole of the cylinder seat 121. The rotating disc 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 rotating disc shaft 151 to prevent water from entering the motor. The retaining ring 13 is used to prevent the movement of the seal ring 14 and to form rotational support. A half-shaft head or cylindrical head is provided at the lower end of the rotating disc shaft 151 for connecting 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 sphere of the spherical cavity, and the 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 turntable 15 are connected by a prismatic hinge and then placed inside the spherical cavity. The spherical surface of the piston, the spherical surface of the turntable, and the spherical cavity have the same center of gravity and form a sealed movable fit, and a sealed movable fit is formed between each fitting surface of the prismatic hinge. The shoe 171 at the upper end of the piston 17 is placed on the 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, and the shoe 171 reciprocates within the chute 181 to form a chute oscillating mechanism and drives the rotation of the turntable shaft 151. The piston 17 and the rotating disc 15 oscillate relative to each other around the prismatic hinge. The shoe 171 slides back and forth within the chute 181. As a result, two operating cavities 100 with alternatingly changing volumes are formed between the upper end surface of the rotating disc 15, both sides of the piston 17, and the spherical cavity.

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

Claims

1. A spherical pump-motor assembly comprising a spherical pump (1) and an outer rotor type motor (2), The rotating disc shaft (151) of the spherical pump (1) is rotatably supported by the central hole of the cylinder seat (121) located 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 upward-facing opening, a magnetic ring (233) is arranged on the inner circumference 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), the outer circumference of the stator holder (242) having a central axis hole is made of multiple groups of coils and magnetic steel A coil winding (241) is provided, the rotor central shaft (232) is inserted into the central shaft hole of the stator holder (242) to form a rotational pair, the stator holder (242) and the coil winding (241) are located in the annular space between the rotor central shaft (232) and the magnetic ring (233), the upper end of the stator holder (242) protrudes from the upper end of the coil winding (241) to form a connection part (243), the cylinder seat (121) is fixedly connected to the connection part (243), the rotor shaft (151) and the rotor central shaft (232) are coaxial, the lower end of the rotor shaft (151) meshes with the upper end of the rotor central shaft (232) to transmit torque, The outer rotor type motor (2) further includes a motor protection case (21), and the upper end opening of the motor protection case (21) and the outer circumference of the connection part (243) are fixedly connected in a sealed manner. The spherical pump-motor assembly is characterized in that the motor protective case (21) is a cylindrical body with an upward-facing opening, a protective case positioning ring (22) is provided between the inner circumference of the opening of the cylindrical body and the outer circumference of the connecting part (243), the protective case positioning ring (22) is fixedly connected to the inner circumference of the motor protective case (21) and the outer circumference of the connecting part (243) so as to seal, and the shape of the upper end of the protective case positioning ring (22) conforms to the shape of the lower end of the cylinder (12) of the spherical pump (1).

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

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

4. The spherical pump-motor assembly according to claim 3, characterized in that the bushing (25) is divided into upper and lower sections, the inner bore diameter of the bushing (25) is smaller than the diameter of the central shaft hole of the stator holder (242), the bushing (25) is pre-fitted into the central shaft hole of the stator holder (242), and the material of the bushing (25) is copper or another wear-resistant material.

5. A spherical pump-motor assembly according to claim 1, characterized in that a semicircular shaft head is provided at the lower end of the rotating disk shaft (151), a semicircular shaft head that engages with the semicircular shaft head of the rotating disk shaft (151) is provided at the upper end surface of the rotor central shaft (232), and the lower end of the rotating disk shaft (151) and the upper end of the rotor central shaft (232) are rotatably connected by the engagement of the semicircular shaft heads.

6. The spherical pump-motor assembly according to claim 5, characterized in that a cylindrical sleeve (3) is provided on the outer circumference of the meshing portion between the rotating disk shaft (151) and the rotor central shaft (232), and the sleeve (3) fixes and covers the upper outer circumference of the semicircular shaft of the rotating disk shaft (151) or fixes and covers the lower outer circumference of the semicircular shaft of the rotor central shaft (232).

7. The spherical pump-motor assembly according to claim 1, characterized in that the lower end of the rotating disk shaft (151) and the upper end of the rotor central shaft (232) are cylindrical heads, a sleeve (3) is provided on the outer circumference of the meshing portion between the lower end of the rotating disk shaft (151) and the upper end of the rotor central shaft (232), the sleeve (3) engages with the cylindrical heads of the lower end of the rotating disk shaft (151) and the upper end of the rotor central shaft (232) by interference fit, and the lower end of the rotating disk shaft (151) and the upper end of the rotor central shaft (232) are rotatably connected by the sleeve (3).

8. 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 one of ultrasonic welding, screw connection, adhesive connection, or clamp connection, and the material of the clamp (19) used for the clamp connection is metal or heat-shrinkable plastic.

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