Spherical pump with clamping type driving shaft

Abstract

The spherical pump with the clamping type driving shaft comprises a stator, the stator comprises a cylinder cover and a cylinder body, and the cylinder cover and the cylinder body are matched to form a spherical inner cavity; a spherical rotor is arranged in the spherical inner cavity, and the spherical peripheral surface of the spherical rotor is matched with the spherical inner cavity; the spherical rotor comprises a piston with a spherical top surface and a turntable with a spherical bottom surface, a clamping groove is formed in the center of the spherical bottom surface of the turntable, the clamping groove is matched with a clamping block, the clamping block is fixed at the end part of a driving shaft, and the central axis of the driving shaft penetrates through the sphere center of the turntable; according to the invention, the spherical surface of the turntable is flexibly connected with the driving shaft; even if machining deviation in a certain range exists in the machining process, the driving shaft can automatically conduct eccentric compensation in the rotating process, the sphere center of the driving shaft and the sphere center of the rotating disc are located on the same straight line as much as possible, and the sealing ring arranged on the outer side of the driving shaft in a sleeving mode can be prevented from being seriously abraded in a short time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pump machinery, in particular to a spherical pump with a clamped driving shaft. BACKGROUND

[0002] In the field of fluid delivery, pump equipment as the core power device is widely used in various technical fields such as industry, medicine, aerospace, etc. With the rapid development of intelligent equipment, the market puts forward higher requirements for pump equipment. For example, oral cleaning tools, micro robot joint drive and other scenes require ultra-micro pump body, and spherical pumps can be widely used in various industrial and intelligent equipment due to their miniaturization and high sealing reliability.

[0003] The spherical pump disclosed in the prior art comprises a rotating disc, the bottom of the rotating disc is fixed with a rotating disc shaft, the rotating disc shaft is a driving shaft, the spherical surface of the rotating disc and the driving shaft are integrally machined and formed, that is, the rotating disc spherical surface and the driving shaft are rigidly connected. The rotating disc spherical surface and the driving shaft are integrally machined and formed, which has high processing difficulty and cost. Due to the machining tolerance in the machining process, the center axis of the driving shaft and the spherical center of the rotating disc are not located on the same straight line. When the spherical pump is working, the rotating disc rotates at high speed. If there is deviation between the center axis of the driving shaft and the spherical center of the rotating disc, the sealing ring outside the driving shaft will be severely worn when the rotating disc rotates at high speed, the service life of the sealing ring will be reduced, and the motor power consumption will be increased. SUMMARY

[0004] The present application provides a spherical pump with a clamped driving shaft to solve the problem of severe wear of the sealing ring, reduction of the service life of the sealing ring and increase of the motor power consumption after long-time operation of the existing spherical pump.

[0005] The technical scheme of the present application is as follows:

[0006] A spherical pump with a clamped driving shaft, comprising a stator, the stator comprising a cylinder cover and a cylinder body, the cylinder cover and the cylinder body cooperating to form a spherical inner cavity; a spherical rotor is arranged in the spherical inner cavity, the spherical outer periphery of the spherical rotor being matched with the spherical inner cavity; the spherical rotor comprises a piston with a spherical top surface and a rotating disc with a spherical bottom surface, the piston and the rotating disc being connected through a cylindrical hinge; a clamping groove is arranged in the center of the spherical bottom surface of the rotating disc, a clamping block is arranged at the upper end of the driving shaft and clamped with the clamping groove, and the center axis of the driving shaft passes through the spherical center of the spherical bottom surface of the rotating disc.

[0007] The clamping groove extends from the spherical bottom surface of the rotating disc to the spherical center, and the center axis of the clamping groove passes through the spherical center of the spherical bottom surface of the rotating disc.

[0008] The clamping groove is a downwardly open blind groove.

[0009] The clamping groove is a through groove penetrating the thickness direction of the rotating disc base body.

[0010] The driving shaft is a motor output shaft, the upper end of the motor output shaft extends into the cylinder body, and the clamping block is fixedly arranged at the upper end of the motor output shaft.

[0011] A retaining ring is arranged on the shaft diameter of the motor output shaft and the lower end shaft hole of the cylinder body, and a sealing ring is arranged above the retaining ring and on the shaft diameter of the motor output shaft.

[0012] The driving shaft comprises a connecting shaft and a motor output shaft, the clamping block is fixed at the upper end of the connecting shaft, the lower end of the connecting shaft is connected with the motor output shaft, the upper end of the connecting shaft extends into the cylinder body, the clamping block is clamped in the clamping groove at the lower end of the rotating disc, a retaining ring is arranged on the shaft diameter of the connecting shaft and the lower end shaft hole of the cylinder body, and a sealing ring is arranged above the retaining ring and on the shaft diameter of the motor output shaft.

[0013] The lower end of the connecting shaft is provided with a groove, the upper end of the motor output shaft is provided with a protrusion matched with the groove, and the protrusion is inserted into the groove and clamped.

[0014] The lower end of the connecting shaft is fixed with a first semicylindrical flat, the upper end of the motor output shaft is fixed with a second semicylindrical flat, the first semicylindrical flat and the second semicylindrical flat are matched to form a cylinder, and a sleeve is arranged outside the cylinder.

[0015] The cylinder cover and the cylinder body are wrapped with a heat shrink tube, and the heat shrink tube is locked after thermal expansion and cold contraction.

[0016] The beneficial effects of the present application are as follows:

[0017] 1. The spherical pump with the clamped driving shaft provided by the present application adopts a split design for the rotating disc spherical surface and the driving shaft, the clamping block at the end of the driving shaft is inserted into the clamping groove, that is, the rotating disc spherical surface and the driving shaft are connected in a flexible manner. The rotating disc spherical surface and the driving shaft are connected in a flexible manner, so that even if there is a certain range of machining deviation in the machining process, the driving shaft can automatically compensate for eccentricity during rotation, so that the center of the driving shaft and the center of the rotating disc are located on the same straight line as much as possible, and the sealing ring arranged outside the driving shaft can be prevented from being seriously worn in a short time, thereby reducing the service life of the sealing ring and improving the sealing reliability. At the same time, if the rotating disc spherical surface and the driving shaft are not located on the same straight line, the torque will be too large when the rotating disc rotates at high speed, thereby causing high power consumption of the motor.

[0018] 2. The spherical pump with the clamped driving shaft provided by the present application has the advantages that the split design of the rotating disc spherical surface and the driving shaft greatly reduces the difficulty of machining the rotating disc spherical surface, improves the yield of the product, and reduces the machining cost. In addition, after the structure of the rotating disc is changed, the sealing ring can be installed from the inside of the cylinder body downward, so that the sealing ring is convenient to install and the sealing reliability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application;

[0020] Figure 2 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application; Figure 1 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application;

[0021] Figure 3 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application;

[0022] Figure 4 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application; Figure 3 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application;

[0023] Figure 5 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application; Figure 3 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application;

[0024] Figure 6 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application;

[0025] Figure 7 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application;

[0026] Figure 8 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application;

[0027] Figure 9 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application;

[0028] Figure 10 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application;

[0029] Figure 11 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application;

[0030] Figure 12 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application;

[0031] Figure 13 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application; Figure 12 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application;

[0032] Figure 14 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application;

[0033] Figure 15 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application;

[0034] Figure 16 A schematic view of a ball pump with a clamping type drive shaft according to embodiment 1 of the present application;

[0035] Figure 17 Schematic structural diagram of the connecting shaft being a stepped shaft in Embodiment 5.

[0036] Description of the reference numerals in the drawings:

[0037] 1. Cylinder head; 101. Liquid inlet; 102. Liquid outlet; 103. Liquid inlet groove; 104. Liquid outlet groove; 105. Rotating sleeve hole; 2. Cylinder block; 201. Mounting plate; 3. Piston; 301. Piston pin seat; 302. Slipper; 4. Turntable; 401. Clamping groove; 402. Turntable pin seat; 5. Driving shaft; 501. Clamping block; 502. Connecting shaft; 502Ⅰ. First stepped section; 502Ⅱ. Second stepped section; 503. Groove; 504. Protrusion; 505. First semi-cylindrical flat position; 506. Second semi-cylindrical flat position; 6. Retaining ring; 7. Sealing ring; 8. Slipper seat; 801. Slide groove; 9. Sleeve; 10. Heat shrinkable tube; 100. Working chamber. Detailed implementation manners

[0038] The following combines Figures 1 to 17 , and describes the detailed implementation manners of the present invention in detail, but it should be understood that the protection scope of the present invention is not limited by the detailed implementation manners.

[0039] Embodiment 1:

[0040] Embodiment 1 of the present invention provides a spherical pump with a clamping type driving shaft. As Figure 1 shown, it is a schematic structural diagram of the spherical pump with a clamping type driving shaft in Embodiment 1. As Figure 2 shown, it is a sectional view along A-A in Figure 1 . The spherical pump includes a stator, and the stator includes a cylinder head 1 and a cylinder block 2. The cylinder head 1 and the cylinder block 2 cooperate to form a spherical inner cavity; a spherical rotor is provided in the spherical inner cavity. The spherical rotor includes a piston 3 and a turntable 4. The piston 3 has a spherical top surface, and the turntable 4 has a spherical bottom surface. The piston 3 and the turntable 4 are connected by a cylindrical hinge to form a spherical rotor, and the spherical outer peripheral surface of the spherical rotor is adapted to the spherical inner cavity. [[ID=?]]

[0041] It should be noted that in the patent with the patent number 202220276246.1 and the patent name of "a water flosser", a specific structure of a spherical pump is disclosed. The specific structure of the disclosed spherical pump includes a cylinder head, a cylinder block, a piston, and a turntable. A turntable shaft is fixed at the bottom of the turntable, and the turntable shaft is the driving shaft. The spherical surface of the turntable and the driving shaft are integrally processed, that is, the spherical surface of the turntable and the driving shaft are rigidly connected.

[0042] In the prior art, a turntable shaft is fixed to the bottom of the turntable, and the spherical surface of the turntable and the drive shaft are integrally machined. Due to a certain range of machining tolerances in the machining process, the spherical surface of the turntable and the drive shaft may not be on the same straight line, which will cause severe wear of the sealing ring sleeved outside the drive shaft when the turntable rotates at high speed, reduce the service life of the sealing ring, and at the same time cause excessive torque when the turntable rotates at high speed, resulting in high power consumption of the motor.

[0043] As Figures 3-5 shown, it is a schematic structural view of the turntable 4; as Figure 6 shown, it is a schematic structural view of the drive shaft 5; in this embodiment, the spherical surface of the turntable 4 and the drive shaft 5 are designed separately. A clamping groove 401 is provided at the center of the spherical bottom surface of the turntable 4, and a clamping block 501 that is clamped with the clamping groove 401 is provided at the upper end of the drive shaft 5. The clamping block 501 is clamped into the clamping groove 401, that is, the turntable 4 and the drive shaft 5 are flexibly connected.

[0044] The turntable 4 has a spherical bottom surface, and the spherical bottom surface is adapted to the spherical inner cavity and forms a sealed dynamic fit; a turntable pin seat 402 is provided at the center of the top surface of the turntable 4, and a clamping groove 401 is provided at the center of the spherical bottom surface of the turntable 4. The clamping groove 401 extends from the spherical bottom surface of the turntable 4 towards the center of the sphere, and the central axis of the clamping groove 401 passes through the center of the sphere of the spherical bottom surface of the turntable. The central axis of the drive shaft 5 also passes through the center of the sphere of the spherical bottom surface of the turntable 4.

[0045] In this embodiment, the clamping groove 401 is a blind groove with an opening downward, and the clamping groove 401 and the clamping block 501 are prism structures that are mutually adapted. The clamping groove 401 and the clamping block 501 can be triangular prism, quadrangular prism, or hexagonal prism structures that are mutually adapted, and the specific structure can be selected according to the actual situation, preferably a quadrangular prism. Taking the clamping block 501 as a quadrangular prism structure as an example, the clamping groove 401 is a quadrangular groove structure that cooperates with the quadrangular prism, and the central axis of the quadrangular groove is the central axis of the clamping groove 401. By adopting the cooperation method of the quadrangular prism and the quadrangular groove, no matter which direction there is a machining deviation, the drive shaft can automatically perform eccentricity compensation during rotation.

[0046] In this embodiment, the drive shaft 5 is the output shaft of the motor. The upper end of the output shaft of the motor extends into the cylinder block 2, and the clamping block 501 is clamped at the upper end of the output shaft of the motor. The clamping block 501 is clamped with the clamping groove 401. A retaining ring 6 is sleeved on the shaft diameter of the output shaft of the motor that is adapted to the lower end shaft hole of the cylinder block 2, and a sealing ring 7 sleeved on the shaft diameter of the output shaft of the motor is provided above the retaining ring 6. <00,00125>Since the turntable 4 and the drive shaft 5 are flexibly connected, there is a gap between the clamping groove 401 and the clamping block 501. Even if there is a certain range of machining tolerances during the machining process, the drive shaft 5 will automatically perform eccentric compensation during rotation, making the centers of the drive shaft 5 and the turntable 4 as close as possible to the same straight line. Since the drive shaft 5 will automatically perform eccentric compensation during rotation, it can avoid serious wear of the sealing ring 7 sleeved outside the drive shaft 5 in a short time; at the same time, it can also solve the problem that when the spherical center of the turntable 4 and the central axis of the drive shaft 5 are not on the same straight line, excessive torque will be caused during the high-speed rotation of the turntable 4, resulting in high motor power consumption.

[0048] Further, in this embodiment, the sealing ring 7 is a Y-shaped sealing ring. The lip of the Y-shaped sealing ring 7 faces the spherical inner cavity. The outer lip of the Y-shaped sealing ring 7 is in contact with the inner side of the cylinder block 2, and the inner lip of the Y-shaped sealing ring 7 is in contact with the outside of the motor output shaft. With the lip of the Y-shaped sealing ring 7 facing the spherical inner cavity, a good sealing effect can be maintained without serious wear of the sealing ring 7.

[0049] As Figure 7 shown, it is a schematic structural diagram of the piston 3. The piston 3 has a spherical top surface, two side surfaces at a certain angle, and piston pin bosses 301 protruding from the lower parts of the two side surfaces. The spherical top surface of the piston 3 is adapted to the spherical inner cavity and forms a sealed dynamic fit. The two end surfaces of the piston pin boss 301 are spherical surfaces adapted to the spherical inner cavity. The piston pin boss 301 and the turntable pin boss 402 form a cylindrical hinge. The cylindrical hinge in this embodiment can be either a C-shaped cylindrical hinge connection or a central pin cylindrical hinge connection. Figure 2 The schematic structural diagram in which the middle turntable 4 and the piston 3 are connected by a C-shaped cylindrical hinge. The C-shaped cylindrical hinge connection and the central pin cylindrical hinge connection structures have been disclosed in the related art of existing spherical pumps and will not be described in detail here.

[0050] A protruding slipper 302 is provided at the center of the spherical top surface of the piston 3. The slipper 302 fixed to the end of the piston 3 is placed in the chute 801 opened on the slipper seat 8. The slipper seat 8 is placed in the rotating sleeve hole 105 provided on the cylinder head 1. The slipper seat 8 and the rotating sleeve hole 105 opened on the cylinder head 1 form a rotational fit; the two parallel side surfaces of the slipper 302 are in contact with the two side surfaces of the chute 801 to form a sliding fit; the two parallel side surfaces of the slipper 302 are symmetrically arranged on both sides of the central axis of the slipper seat 8 and are parallel to the central axis of the cylindrical hinge. The central axis of the slipper seat 8 passes through the center of the spherical inner cavity, and an angle is formed between the central axis of the drive shaft 5 and the central axis of the slipper seat 8.

[0051] As Figure 9 shown, it is a three-dimensional structural diagram of the cylinder head 1 in this embodiment; as Figure 10As shown in the figure, it is a bottom view structural schematic diagram of the cylinder cover 1 in the embodiment. The cylinder cover 1 is provided with a hemispherical inner cavity I. The cylinder cover 1 is provided with a liquid inlet 101 and a liquid outlet 102. The cylinder cover 1 is provided with a liquid inlet groove 103 and a liquid outlet groove 104 on the hemispherical inner cavity I. The liquid inlet 101 is communicated with the liquid inlet groove 103. The liquid outlet 102 is communicated with the liquid outlet groove 104. As shown in the figure, Figure 11 As shown in the figure, it is a structural schematic diagram of the cylinder body 2 in the embodiment. The cylinder body 2 is provided with a hemispherical inner cavity II. The hemispherical inner cavity I and the hemispherical inner cavity II cooperate to form a spherical inner cavity after the cylinder cover 1 and the cylinder body 2 are fixedly connected. The lower surface of the cylinder cover 1 is attached to the upper surface of the cylinder body 2. The lower surface of the cylinder cover 1 is provided with an annular cavity. An O-shaped sealing ring is placed in the annular cavity. The lower end of the cylinder body 2 is fixedly provided with a mounting plate 201. The mounting plate 201 is fixedly connected with a driving motor of the spherical pump.

[0052] The fixed connection mode of the cylinder cover 1 and the cylinder body 2 can be various, such as fixed connection by using screws, fixed connection by positioning and then fixed connection by ultrasonic welding. In the embodiment, the cylinder cover 1 and the cylinder body 2 are fixedly connected by using a heat shrink tube 10. When the cylinder cover 1 and the cylinder body 2 are fixedly connected by using the heat shrink tube 10, the heat shrink tube 10 is expanded by heat and then wrapped outside the cylinder cover 1 and the cylinder body 2. When the heat shrink tube 10 is contracted by cold, the cylinder cover and the cylinder body are locked.

[0053] In specific work, the driving shaft 5 is rotated by the motor. The driving shaft 5 is the motor output shaft. The motor output shaft drives the rotating disc 4, the piston 3 and the sliding shoe seat 8 to rotate synchronously. Since the clamping block 501 fixedly arranged at the end of the motor output shaft is clamped in the clamping groove 401 arranged on the rotating disc 4, there is a gap between the clamping block 501 and the clamping groove 401. The motor output shaft can automatically compensate eccentricity during rotation.

[0054] The rotating disc 4 drives the piston pin seat 301 to rotate through the rotating disc pin seat 402. The piston pin seat 301 drives the piston 3 to rotate. The sliding shoe 302 protruding in the center of the spherical top surface of the piston 3 reciprocally slides in the sliding groove 801 arranged on the sliding shoe seat 8. The sliding shoe 302 drives the sliding shoe seat 8 to rotate in the rotating sleeve hole 105 arranged on the cylinder cover 1. When the spherical rotor rotates in the spherical inner cavity, the piston 3 and the rotating disc 4 swing relative to each other. Two working chambers 100 with alternating volumes are formed between the upper end surface of the rotating disc 4, the two side surfaces of the piston 3 and the spherical inner cavity.

[0055] One working chamber 100 needs to suck liquid and is connected with the liquid inlet 101 arranged on the cylinder cover 1. After the spherical pump is started, liquid is sucked into the working chamber 100 through the liquid inlet 101 by negative pressure. The liquid enters the liquid inlet groove 103 through the liquid inlet channel in the liquid inlet 101 and then enters the working chamber 100 through the liquid inlet groove 103. The other working chamber 100 needs to compress and discharge liquid and is connected with the liquid outlet groove 104 arranged on the cylinder cover 1. The liquid outlet groove 104 is connected with the liquid outlet channel arranged in the liquid outlet 102. After the pump body is pressurized, liquid is discharged through the liquid outlet 102.

[0056] Example 2:

[0057] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that in this embodiment, the clamping groove 401 is a through groove penetrating the thickness direction of the base body of the turntable 4; as Figures 12-13 shown, it is a schematic structural diagram of the turntable 4 in this embodiment; a clamping groove 401 is provided at the center of the spherical bottom surface of the turntable 4. The clamping groove 401 extends from the spherical bottom surface of the turntable 4 towards the center of the sphere. The central axis of the clamping groove 401 passes through the center of the sphere of the spherical bottom surface of the turntable, and the clamping groove 401 is a through groove penetrating the thickness direction of the base body of the turntable 4. In this embodiment, the structure of the drive shaft 5 is the same as that in Embodiment 1, and the clamping block 501 fixed at the end of the drive shaft 5 is clamped with the clamping groove 401. In this embodiment, the through groove structure of the clamping groove 401 is convenient for processing, which can reduce the mechanical processing cost and improve the processing efficiency at the same time.

[0058] Example 3:

[0059] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that in this embodiment, the drive shaft 5 includes a connecting shaft 502 and a motor output shaft. The clamping block 501 is fixed at the upper end of the connecting shaft 502. The lower end of the connecting shaft 502 is connected to the motor output shaft. The upper end of the connecting shaft 502 extends into the cylinder block 2 and the clamping block 501 is clamped with the clamping groove 401 at the lower end of the turntable 4. A retaining ring 6 is sleeved on the shaft diameter of the connecting shaft 502 that is adapted to the lower end shaft hole of the cylinder block 2, and a sealing ring 7 sleeved on the shaft diameter of the motor output shaft is provided above the retaining ring 6.

[0060] A groove 503 is opened at the lower end of the connecting shaft 502, and a convex block 504 adapted to the groove 503 is provided at the upper end of the motor output shaft. The length of the connecting shaft 502 is less than the length of the lower end shaft hole of the cylinder block 2. The upper end of the motor output shaft extends into the cylinder block 2, and the convex block 504 fixed at the upper end of the motor output shaft is inserted into the groove 503 for clamping.

[0061] As Figure 14 shown, it is a schematic structural diagram of the connection between the connecting shaft 502 and the turntable 4 in this embodiment. As Figure 15 shown, it is a schematic structural diagram of the connection between the connecting shaft 502 and the motor output shaft through the groove 503 and the convex block 504. Specifically, the convex block 504 fixed at the upper end of the motor output shaft preferably has a square column structure, and the groove 503 opened at the lower end of the connecting shaft 502 is a square groove structure adapted to the square column. The cooperation of the square column and the square groove can ensure the stable transmission between the motor output shaft and the connecting shaft 502.

[0062] In the embodiment, the driving shaft 5 is composed of two parts, the motor drives the motor output shaft to rotate, and the motor output shaft drives the connecting shaft 502 to rotate; the driving shaft 5 composed of two parts can improve the flexibility of the system, the motor output shaft and the connecting shaft 502 are connected through the cooperation of the protrusion 504 and the groove 503, the connecting shaft 502 and the rotating disc 4 are connected through the cooperation of the clamping block 501 and the clamping groove 401, and the motor output shaft and the connecting shaft 502 and the connecting shaft 502 and the rotating disc 4 can automatically compensate for eccentricity during rotation, avoiding serious wear of the sealing ring 7 sleeved outside the connecting shaft 502 in a short time.

[0063] Embodiment 4:

[0064] The embodiment is based on embodiment 1, and the difference between the embodiment and embodiment 1 is that, in the embodiment, the driving shaft includes a connecting shaft 502 and a motor output shaft, the connecting shaft 502 has a clamping block 501 fixed at the upper end, and the upper end of the connecting shaft 502 extends into the cylinder body 2 and is clamped into the clamping groove 401 formed on the rotating disc 4. The lower end of the connecting shaft 502 is fixed with a first semicircular cylindrical flat 505, and the upper end of the motor output shaft is fixed with a second semicircular cylindrical flat 506, the first semicircular cylindrical flat 505 and the second semicircular cylindrical flat 506 cooperate to form a cylindrical body, and the cylindrical body is sleeved with a sleeve 9 outside.

[0065] As shown in Figure 16 , it is a structure diagram of the connection of the connecting shaft and the motor output shaft in the embodiment. The difference between the embodiment and embodiment 3 is only that the connection mode of the motor output shaft and the connecting shaft 502 is different, in the embodiment, two semicircular cylindrical flats cooperate to form a cylindrical body, and the sleeve 9 is sleeved outside the two semicircular cylindrical flats to limit the lateral large-range movement of the two semicircular cylindrical flats.

[0066] In the embodiment, the motor drives the motor output shaft to rotate, the motor output shaft drives the connecting shaft 502 to rotate through the cooperation of the two semicircular cylindrical flats, and when the motor output shaft and the connecting shaft 502 rotate relative to each other, the two semicircular cylindrical flats will move relative to each other in the sleeve 9 to automatically compensate for eccentricity. In the embodiment, the sleeve 9 cooperates with the two semicircular cylindrical flats to automatically compensate for eccentricity while avoiding large-range movement of the motor output shaft and the connecting shaft 502 during rotation.

[0067] Embodiment 5:

[0068] The embodiment is based on the embodiment 3 or the embodiment 4, and the difference between the embodiment and the embodiment 3 or the embodiment 4 is that the connecting shaft 502 is a stepped shaft, the stepped shaft comprises a first stepped section 502I and a second stepped section 502II, the first stepped section 502I is fixed with the clamping block 501 at the upper end, and the second stepped section 502II is connected with the motor output shaft at the lower end; the diameter of the second stepped section 502II is greater than that of the first stepped section 502I, and the sealing ring 7 is arranged on the outer side of the first stepped section 502I.

[0069] As shown in Figure 17 The connecting shaft is a stepped shaft, and the structure schematic diagram is shown. In the embodiment, the connecting shaft 502 is a stepped shaft, and the design of the stepped shaft plays a supporting role for the sealing ring 7, so that the problem of unreliable sealing of the sealing ring 7 due to axial movement can be avoided.

[0070] In summary, the application provides a spherical pump with a clamping type driving shaft, the spherical surface of the rotating disc and the driving shaft are designed in a split manner, even if there is a certain range of machining deviation in the machining process, the driving shaft will automatically compensate for the eccentricity during rotation, so that the driving shaft and the spherical center of the rotating disc are located on the same straight line as much as possible, the problem that the sealing ring arranged on the outer side of the driving shaft is seriously worn in a short time, and then the service life of the sealing ring is reduced and the sealing reliability is poor can be avoided. At the same time, the new structure of the rotating disc greatly reduces the processing difficulty of the rotating disc, and improves the processing yield of the product.

Claims

1. A ball pump with a snap-fit ​​drive shaft, characterized in that, The device includes a stator, which comprises a cylinder head and a cylinder block, which together form a spherical inner cavity. A spherical rotor is disposed within the spherical inner cavity, and the spherical outer circumferential surface of the spherical rotor is adapted to the spherical inner cavity. The spherical rotor includes a piston with a spherical top surface and a turntable with a spherical bottom surface, which are connected by a cylindrical hinge. A locking groove is provided in the center of the spherical bottom surface of the turntable, and a locking block is provided at the upper end of the drive shaft to engage with the locking groove. The central axis of the drive shaft passes through the center of the spherical bottom surface of the turntable.

2. The ball pump with a snap-fit ​​drive shaft as described in claim 1, characterized in that, The snap-fit ​​groove extends from the spherical bottom surface of the turntable towards the center of the sphere, and the central axis of the snap-fit ​​groove passes through the center of the spherical bottom surface of the turntable.

3. The spherical pump with a snap-fit ​​drive shaft as described in claim 2, characterized in that, The snap-fit ​​groove is a blind groove with its opening facing downwards.

4. The ball pump with a snap-fit ​​drive shaft as described in claim 2, characterized in that, The snap-fit ​​groove is a through groove that extends through the thickness of the turntable substrate.

5. The ball pump with a snap-fit ​​drive shaft as described in claim 2, characterized in that, The drive shaft is a motor output shaft, with the upper end of the motor output shaft extending into the cylinder body. The snap-fit ​​block is fixedly installed at the upper end of the motor output shaft.

6. The ball pump with a snap-fit ​​drive shaft as described in claim 5, characterized in that, A retaining ring is fitted on the shaft diameter that matches the lower end shaft hole of the cylinder, and a sealing ring is fitted on the shaft diameter of the motor output shaft above the retaining ring.

7. The ball pump with a snap-fit ​​drive shaft as described in claim 2, characterized in that, The drive shaft includes a connecting shaft and a motor output shaft. The snap-fit ​​block is fixed to the upper end of the connecting shaft, and the lower end of the connecting shaft is connected to the motor output shaft. After the upper end of the connecting shaft extends into the cylinder body, the snap-fit ​​block snaps into the snap-fit ​​groove at the lower end of the turntable. A retaining ring is fitted on the shaft diameter that matches the shaft hole at the lower end of the cylinder body, and a sealing ring is fitted on the shaft diameter of the motor output shaft above the retaining ring.

8. The ball pump with a snap-fit ​​drive shaft as described in claim 7, characterized in that, The lower end of the connecting shaft is provided with a groove, and the upper end of the motor output shaft is provided with a protrusion that matches the groove. The protrusion is inserted into the groove and engaged.

9. The ball pump with a snap-fit ​​drive shaft as described in claim 7, characterized in that, The lower end of the connecting shaft is fixed with a first semi-cylindrical flat part, and the upper end of the motor output shaft is fixed with a second semi-cylindrical flat part. The first and second semi-cylindrical flat parts cooperate to form a cylinder, and a sleeve is fitted on the outside of the cylinder.

10. The ball pump with a snap-fit ​​drive shaft as described in claim 1, characterized in that, The cylinder head and the cylinder body are covered with heat shrink tubing, which locks the cylinder head and the cylinder body together after thermal expansion and contraction.

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