A spherical pump having a snap-on drive shaft

Abstract

The utility model provides a kind of spherical pump with clamping type drive shaft, including stator, stator includes cylinder cover and cylinder body, cylinder cover and cylinder body cooperation form spherical inner cavity;Spherical inner cavity is equipped with spherical rotor, and the spherical outer circumferential surface of spherical rotor is adapted with spherical inner cavity;Spherical rotor includes piston with spherical top surface and turntable with spherical bottom surface, and the spherical bottom surface center of turntable is equipped with clamping groove, and clamping groove is adapted with clamping block, and clamping block is fixed at the end of drive shaft, and the central axis of drive shaft passes through the spherical center of turntable;In the utility model, turntable spherical surface and drive shaft adopt the mode of flexible connection;Even if there is a certain range of machining deviation in machining process, drive shaft will automatically carry out eccentric compensation in rotating process, so that the spherical center of drive shaft and turntable is located on the same straight line as far as possible, and the sealing ring sleeved outside drive shaft can be avoided to appear serious abrasion in short time.

Description

Technical Field

[0001] This utility model relates to the field of pump machinery technology, and in particular to a spherical pump with a snap-fit ​​drive shaft. Background Technology

[0002] In the field of fluid transport, pumps serve as core power units and are widely used in various industrial, medical, aerospace, and other technological fields. Currently, with the rapid development of intelligent equipment, the market is placing higher demands on pumps. For example, scenarios such as oral hygiene products and micro-robot joint actuators require ultra-miniature pump bodies, and ball pumps, with their advantages of miniaturization and high sealing reliability, can be widely used in various industrial and intelligent equipment.

[0003] Existing spherical pumps include a turntable with a shaft fixed to its bottom, which serves as the drive shaft. The spherical surface of the turntable and the drive shaft are integrally machined, meaning they are rigidly connected. This integral machining process is difficult and costly. Furthermore, due to machining tolerances, the central axis of the drive shaft and the center of the turntable may not be aligned. Since the turntable rotates at high speed during operation, any deviation between the drive shaft's central axis and the turntable's center will cause severe wear on the outer sealing ring of the drive shaft, reducing its lifespan and increasing motor power consumption. Summary of the Invention

[0004] This invention provides a spherical pump with a snap-fit ​​drive shaft to solve the problems of severe wear of the seal ring, reduced seal ring life, and increased motor power consumption in existing spherical pumps after long-term operation.

[0005] The technical solution of this utility model is:

[0006] A spherical pump with a snap-fit ​​drive shaft includes a stator, which includes a cylinder head and a cylinder body, the cylinder head and cylinder body fitting together to form a spherical inner cavity; a spherical rotor is disposed within the spherical inner cavity, the spherical outer circumferential surface of the spherical rotor being 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, the piston and the turntable being connected by a cylindrical hinge; a snap-fit ​​groove is provided in the center of the spherical bottom surface of the turntable, and a snap-fit ​​block is provided at the upper end of the drive shaft to snap into the snap-fit ​​groove, the central axis of the drive shaft passing through the center of the spherical bottom surface of the turntable.

[0007] The aforementioned 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.

[0008] The aforementioned snap-fit ​​groove is a blind groove with its opening facing downwards.

[0009] The aforementioned snap-fit ​​groove is a through groove that extends through the thickness of the turntable substrate.

[0010] The aforementioned drive shaft is a motor output shaft, with the upper end of the motor output shaft extending into the cylinder body, and a snap-fit ​​block fixedly installed at the upper end of the motor output shaft.

[0011] 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.

[0012] The aforementioned drive shaft includes a connecting shaft and a motor output shaft. A 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.

[0013] The lower end of the aforementioned 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.

[0014] The lower end of the aforementioned 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.

[0015] The cylinder head and cylinder block are covered with heat shrink tubing, which locks the cylinder head and cylinder block together after thermal expansion and contraction.

[0016] The beneficial effects of this utility model are:

[0017] 1. This utility model provides a spherical pump with a snap-fit ​​drive shaft. The spherical surface of the turntable and the drive shaft are designed separately. The snap-fit ​​block fixed at the end of the drive shaft is inserted into the snap-fit ​​groove, that is, the spherical surface of the turntable and the drive shaft are flexibly connected. This flexible connection allows for automatic eccentricity compensation during rotation, even if there are certain machining deviations, due to the gap between the snap-fit ​​groove and the snap-fit ​​block. This ensures that the centers of the drive shaft and the turntable are as close to a straight line as possible, preventing severe wear of the sealing ring on the outside of the drive shaft in a short time, thus avoiding reduced sealing ring life and poor sealing reliability. Furthermore, if the spherical surface of the turntable and the drive shaft are not aligned, excessive torque will occur during high-speed rotation of the turntable, leading to high motor power consumption.

[0018] 2. The spherical pump with a snap-fit ​​drive shaft provided by this utility model has a significantly reduced machining difficulty for the spherical surface of the turntable and an improved product yield due to the separate design of the turntable spherical surface and drive shaft. The machining cost is also reduced. In addition, after the turntable structure is changed, the sealing ring can be installed from the inside of the cylinder, which makes the installation of the sealing ring convenient and improves the sealing reliability. Attached Figure Description

[0019] Figure 1 A schematic diagram of a ball pump with a snap-fit ​​drive shaft provided in Embodiment 1 of this utility model;

[0020] Figure 2 for Figure 1 Schematic diagram of the AA section;

[0021] Figure 3 This is a schematic diagram of the turntable structure in Example 1;

[0022] Figure 4 for Figure 3 Schematic diagram of the BB cross section;

[0023] Figure 5 for Figure 3 A schematic diagram of a structure with a snap-fit ​​groove in the center of the bottom surface of the transfer tray;

[0024] Figure 6 This is a schematic diagram of the drive shaft structure in Example 1;

[0025] Figure 7 This is a schematic diagram of the piston structure in Example 1;

[0026] Figure 8 This is a schematic diagram of the slide shoe seat in Example 1;

[0027] Figure 9 This is a three-dimensional structural diagram of the cylinder head in Example 1;

[0028] Figure 10 This is a bottom view of the cylinder head structure in Example 1;

[0029] Figure 11 This is a schematic diagram of the cylinder block in Example 1;

[0030] Figure 12 This is a schematic diagram of the turntable structure in Example 2;

[0031] Figure 13 for Figure 12 Schematic diagram of the CC section;

[0032] Figure 14 This is a schematic diagram of the connection between the connecting shaft and the turntable in Example 3;

[0033] Figure 15 This is a schematic diagram of the structure in Embodiment 3 where the connecting shaft and the motor output shaft are connected by a groove and a protrusion;

[0034] Figure 16 This is a schematic diagram of the structure in Example 4 where the connecting shaft and the motor output shaft are connected by a semi-cylindrical flat section;

[0035] Figure 17 This is a schematic diagram of the structure in Example 5 where the connecting shaft is a stepped shaft.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Cylinder head; 101. Liquid inlet; 102. Liquid outlet; 103. Liquid inlet groove; 104. Liquid outlet groove; 105. Rotary sleeve hole; 2. Cylinder body; 201. Mounting plate; 3. Piston; 301. Piston pin seat; 302. Slipper; 4. Turntable; 401. Snap-fit ​​groove; 402. Turntable pin seat; 5. Drive shaft; 501. Snap-fit ​​block; 502. Connecting shaft; 502Ⅰ. First step section; 502Ⅱ. Second step section; 503. Groove; 504. Protrusion; 505. First semi-cylindrical flat part; 506. Second semi-cylindrical flat part; 6. Retaining ring; 7. Sealing ring; 8. Slipper seat; 801. Slide groove; 9. Sleeve; 10. Heat shrink tubing; 100. Working chamber. Detailed Implementation

[0038] The following is combined Figures 1 to 17 The specific embodiments of this utility model are described in detail below, but it should be understood that the scope of protection of this utility model is not limited to the specific embodiments.

[0039] Example 1:

[0040] Embodiment 1 of this utility model provides a ball pump with a snap-fit ​​drive shaft, such as... Figure 1 The diagram shown is a structural schematic of the ball pump with a snap-fit ​​drive shaft in Example 1. Figure 2 As shown, Figure 1 Schematic diagram of cross-section AA. A spherical pump includes a stator, which comprises a cylinder head 1 and a cylinder body 2. The cylinder head 1 and cylinder body 2 cooperate to form a spherical inner cavity. A spherical rotor is disposed within 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 the spherical rotor. The spherical outer circumference of the spherical rotor is adapted to the spherical inner cavity.

[0041] It should be noted that patent number 202220276246.1, entitled "A Water Flosser," discloses a specific structure of a spherical pump. The disclosed spherical pump structure includes a cylinder head, a cylinder body, a piston, and a turntable. A turntable shaft is fixed to the bottom of the turntable, which is also the drive shaft. The spherical surface of the turntable and the drive shaft are integrally machined, meaning that the spherical surface of the turntable and the drive shaft are rigidly connected.

[0042] In existing technology, 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 the machining tolerances within a certain range, the spherical surface of the turntable and the drive shaft may not be on the same straight line. As a result, when the turntable rotates at high speed, the sealing ring on the outside of the drive shaft will wear severely, reducing its lifespan. At the same time, the high-speed rotation of the turntable will cause excessive torque, leading to high motor power consumption.

[0043] like Figures 3-5 The diagram shown is a structural schematic of turntable 4; as shown... Figure 6 The diagram shows the structure of the drive shaft 5. In this embodiment, the spherical surface of the turntable 4 and the drive shaft 5 are designed separately. The center of the spherical bottom surface of the turntable 4 is provided with a snap-fit ​​groove 401. A snap-fit ​​block 501 is provided at the upper end of the drive shaft 5 to snap into the snap-fit ​​groove 401. The snap-fit ​​block 501 is snapped into the snap-fit ​​groove 401, that is, the turntable 4 and the drive shaft 5 are flexibly connected.

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

[0045] In this embodiment, the snap-fit ​​groove 401 is a blind groove with an opening facing downwards, and the snap-fit ​​groove 401 and the snap-fit ​​block 501 are mutually compatible prism structures. The snap-fit ​​groove 401 and the snap-fit ​​block 501 can be mutually compatible triangular prism, square prism, or hexagonal prism structures, and the specific structure can be selected according to the actual situation, with square prisms being preferred. Taking the snap-fit ​​block 501 as a square prism structure as an example, the snap-fit ​​groove 401 is a square slot structure that mates with the square prism, and the central axis of the square slot is the central axis of the snap-fit ​​groove 401. By using the square prism and square slot mating method, regardless of which direction there is a machining deviation, the drive shaft 5 can automatically compensate for eccentricity during rotation.

[0046] In this embodiment, the drive shaft 5 is a motor output shaft, the upper end of which extends into the cylinder body 2. The snap-fit ​​block 501 snaps onto the upper end of the motor output shaft, and the snap-fit ​​block 501 snaps into the snap-fit ​​groove 401. A retaining ring 6 is fitted on the shaft diameter of the motor output shaft that matches the lower end shaft hole of the cylinder body 2, and a sealing ring 7 is fitted on the shaft diameter of the motor output shaft above the retaining ring 6.

[0047] Because the turntable 4 and drive shaft 5 are flexibly connected, and there is a gap between the locking groove 401 and the locking block 501, even if there are certain machining tolerances during the machining process, the drive shaft 5 will automatically compensate for eccentricity during rotation, ensuring that the centers of the drive shaft 5 and the turntable 4 are as close to the same straight line as possible. This automatic eccentricity compensation during rotation prevents severe wear of the sealing ring 7 on the outer side of the drive shaft 5 in a short period. It also solves the problem of excessive torque and high motor power consumption caused by the misalignment of the spherical center of the turntable 4 and the central axis of the drive shaft 5 during high-speed rotation.

[0048] Furthermore, 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 body 2, and the inner lip of the Y-shaped sealing ring 7 is in contact with the outer side of the motor output shaft. By aligning the lip of the Y-shaped sealing ring 7 with the spherical inner cavity, a good sealing effect can be maintained without severe wear of the sealing ring 7.

[0049] like Figure 7 The diagram shows the structure of piston 3. Piston 3 has a spherical top surface, two side surfaces at a certain angle, and piston pin seats 301 protruding from the lower part of the two side surfaces. The spherical top surface of piston 3 is adapted to the spherical inner cavity to form a sealing dynamic fit. The two end faces of piston pin seats 301 are spherical surfaces adapted to the spherical inner cavity. Piston pin seats 301 and turntable pin seats 402 form a cylindrical hinge. In this embodiment, the cylindrical hinge can be either a C-type cylindrical hinge connection or a center pin cylindrical hinge connection. Figure 2 The diagram shows the structure of the central rotating plate 4 and the piston 3 connected by a C-shaped cylindrical hinge. The C-shaped cylindrical hinge connection and the central pin cylindrical hinge connection structure have been disclosed in existing ball pump related technologies 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, which is fixed at the end of the piston 3, is placed in a groove 801 opened on the slipper seat 8. The slipper seat 8 is placed in a rotating hole 105 provided on the cylinder head 1, and the slipper seat 8 and the rotating hole 105 on the cylinder head 1 form a rotational fit. The two parallel sides of the slipper 302 are in contact with the two sides of the groove 801 to form a sliding fit. The two parallel sides 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 the central axis of the drive shaft 5 forms an angle with the central axis of the slipper seat 8.

[0051] like Figure 9 As shown, this is a three-dimensional structural diagram of the cylinder head 1 in this embodiment; Figure 10The diagram shown is a bottom view of the cylinder head 1 in this embodiment. The cylinder head 1 has a hemispherical inner cavity I, with an inlet 101 and an outlet 102. An inlet groove 103 and an outlet groove 104 are provided within the hemispherical inner cavity I of the cylinder head 1. The inlet 101 communicates with the inlet groove 103, and the outlet 102 communicates with the outlet groove 104. Figure 11 The diagram shows the structure of cylinder 2 in this embodiment. Cylinder 2 has a hemispherical inner cavity II. After cylinder head 1 and cylinder 2 are fixedly connected, the hemispherical inner cavity I and hemispherical inner cavity II cooperate to form a spherical inner cavity. The lower surface of cylinder head 1 is in contact with the upper surface of cylinder 2. An annular cavity is formed on the lower surface of cylinder head 1, and an O-ring seal is placed inside the annular cavity. A mounting plate 201 is fixed to the lower end of cylinder 2, and the mounting plate 201 is fixedly connected to the drive motor of the spherical pump.

[0052] There are several ways to fix the cylinder head 1 and cylinder body 2, such as using screws or fixing them by ultrasonic welding after positioning with a positioning structure. In this embodiment, the cylinder head 1 and cylinder body 2 are fixedly connected using heat shrink tubing 10. When using heat shrink tubing 10 for fixing, the heat shrink tubing 10 is heated and expanded to cover the outside of the cylinder head 1 and cylinder body 2. When the heat shrink tubing 10 is cooled and shrunk, the cylinder head and cylinder body are locked together.

[0053] In actual operation, the motor drives the drive shaft 5 to rotate. The drive shaft 5 is the motor output shaft, which drives the turntable 4, piston 3, and slide shoe seat 8 to rotate synchronously. Since the locking block 501 fixed at the end of the motor output shaft is locked in the locking groove 401 opened on the turntable 4, there is a gap between the locking block 501 and the locking groove 401. The motor output shaft will automatically perform eccentric compensation during rotation.

[0054] Turntable 4 drives piston pin seat 301 to rotate via turntable pin seat 402. Piston pin seat 301 drives piston 3 to rotate. The sliding shoe 302 protruding from the center of the spherical top surface of piston 3 slides back and forth in the groove 801 opened on the sliding shoe seat 8. The sliding shoe 302 drives the sliding shoe seat 8 to rotate in the rotating sleeve hole 105 provided on the cylinder head 1. When the spherical rotor rotates in the spherical inner cavity, piston 3 and turntable 4 swing relative to each other, forming two working chambers 100 with alternating volumes between the upper end face of turntable 4, the two sides of piston 3 and the spherical inner cavity.

[0055] When one chamber 100 needs to draw in liquid, it is connected to the liquid inlet 101 provided on the cylinder cover 1. After the ball pump starts, the liquid is drawn in through the liquid inlet 101 by the negative pressure. The liquid enters the liquid inlet 103 through the liquid inlet channel in the liquid inlet 101, and then enters the chamber 100 through the liquid inlet 103. When the other chamber 100 needs to compress and discharge liquid, it is connected to the liquid discharge trough 104 provided on the cylinder cover 1. The liquid discharge trough 104 is connected to the liquid discharge channel provided in the liquid discharge port 102. After being pressurized by the pump body, the liquid is discharged through the liquid discharge port 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 snap-fit ​​groove 401 is a through groove that penetrates the thickness direction of the turntable 4 substrate; as shown... Figures 12-13 The diagram shows a schematic of the turntable 4 in this embodiment. A locking groove 401 is provided in the center of the spherical bottom surface of the turntable 4. The locking groove 401 extends from the spherical bottom surface of the turntable 4 towards the center of the sphere, and its central axis passes through the center of the spherical bottom surface. The locking groove 401 is a through groove penetrating the thickness direction of the turntable 4 substrate. In this embodiment, the structure of the drive shaft 5 is the same as in Embodiment 1. The locking block 501 fixed at the end of the drive shaft 5 engages with the locking groove 401. In this embodiment, the locking groove 401 adopts a through groove structure, which facilitates processing, reduces machining costs, and improves processing efficiency.

[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 snap-fit ​​block 501 is fixed on the upper end of the connecting shaft 502. The lower end of the connecting shaft 502 is connected to the motor output shaft. After the upper end of the connecting shaft 502 extends into the cylinder 2, the snap-fit ​​block 501 snaps into the snap-fit ​​groove 401 at the lower end of the turntable 4. A retaining ring 6 is fitted on the shaft diameter that matches the shaft hole at the lower end of the connecting shaft 502 and the cylinder 2. A sealing ring 7 is fitted on the shaft diameter of the motor output shaft above the retaining ring 6.

[0060] The lower end of the connecting shaft 502 is provided with a groove 503, and the upper end of the motor output shaft is provided with a protrusion 504 that matches the groove 503. The length of the connecting shaft 502 is less than the length of the shaft hole at the lower end of the cylinder body 2. The upper end of the motor output shaft extends into the cylinder body 2, and the protrusion 504 fixed at the upper end of the motor output shaft is inserted into the groove 503 for engagement.

[0061] like Figure 14 The diagram shown is a structural schematic of the connection between the connecting shaft 502 and the turntable 4 in this embodiment. Figure 15 The diagram shows the structure of the connecting shaft 502 and the motor output shaft connected by the groove 503 and the protrusion 504 in this embodiment. Specifically, the protrusion 504 fixed at the upper end of the motor output shaft is preferably a square column structure, and the groove 503 at the lower end of the connecting shaft 502 is a square slot structure adapted to the square column. The use of a square column and a square slot ensures stable transmission between the motor output shaft and the connecting shaft 502.

[0062] In this embodiment, the drive shaft 5 consists of two parts: a motor drives the motor output shaft to rotate, and the motor output shaft drives the connecting shaft 502 to rotate. The two-part drive shaft 5 improves the system's motion flexibility. The motor output shaft and the connecting shaft 502 are connected by a protrusion 504 and a groove 503. The connecting shaft 502 and the turntable 4 are connected by a snap-fit ​​block 501 and a snap-fit ​​groove 401. During rotation, the motor output shaft and the connecting shaft 502, as well as the connecting shaft 502 and the turntable 4, can automatically compensate for eccentricity, preventing the sealing ring 7 on the outside of the connecting shaft 502 from experiencing severe wear in a short period of time.

[0063] Example 4:

[0064] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the drive shaft in this embodiment includes a connecting shaft 502 and a motor output shaft. A snap-fit ​​block 501 is fixed to the upper end of the connecting shaft 502, and the upper end of the connecting shaft 502 extends into the cylinder 2 and snaps into the snap-fit ​​groove 401 opened on the turntable 4. A first semi-cylindrical flat part 505 is fixed to the lower end of the connecting shaft 502, and a second semi-cylindrical flat part 506 is fixed to the upper end of the motor output shaft. The first semi-cylindrical flat part 505 and the second semi-cylindrical flat part 506 cooperate to form a cylinder, and a sleeve 9 is sleeved on the outside of the cylinder.

[0065] like Figure 16 The diagram shown is a structural schematic of the connection between the connecting shaft and the motor output shaft in this embodiment, which is achieved through a semi-cylindrical flat section. The only difference between this embodiment and embodiment 3 is the connection method between the motor output shaft and the connecting shaft 502. In this embodiment, two semi-cylindrical flat sections are used to form a cylinder, and the sleeve 9 is placed on the outside of the two semi-cylindrical flat sections to restrict their large-scale lateral movement.

[0066] In this 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 two semi-cylindrical flat parts. When the motor output shaft and the connecting shaft 502 rotate relative to each other, the two semi-cylindrical flat parts will move relative to each other within the sleeve 9 to automatically compensate for eccentricity. This embodiment utilizes the cooperation between the sleeve 9 and the two semi-cylindrical flat parts to automatically compensate for eccentricity while preventing large-scale movement of the motor output shaft and the connecting shaft 502 during rotation.

[0067] Example 5:

[0068] This embodiment is based on embodiment 3 or embodiment 4. The difference between this embodiment and embodiment 3 or embodiment 4 is that the connecting shaft 502 is a stepped shaft. The stepped shaft includes a first stepped segment 502Ⅰ and a second stepped segment 502Ⅱ. A snap-fit ​​block 501 is fixed at the upper end of the first stepped segment 502Ⅰ, and the lower end of the second stepped segment 502Ⅱ is connected to the motor output shaft. The diameter of the second stepped segment 502Ⅱ is larger than the diameter of the first stepped segment 502Ⅰ. A sealing ring 7 is provided above the second stepped segment 502Ⅱ and sleeved on the outside of the first stepped segment 502Ⅰ.

[0069] like Figure 17 The diagram shows a stepped shaft connecting the connecting shaft. In this embodiment, the stepped shaft 502 provides support for the sealing ring 7, preventing unreliable sealing due to axial movement of the sealing ring 7.

[0070] In summary, this utility model provides a spherical pump with a snap-fit ​​drive shaft. The spherical surface of the turntable and the drive shaft are designed separately. Even if there are certain machining deviations during the machining process, the drive shaft will automatically compensate for eccentricity during rotation, ensuring that the centers of the drive shaft and the turntable are as close to the same straight line as possible. This avoids severe wear of the sealing ring on the outside of the drive shaft in a short period of time, thus preventing problems such as reduced sealing ring life and poor sealing reliability. At the same time, the new structure of the turntable significantly reduces the difficulty of turntable machining and improves the product yield.

Claims

1. A ball pump with a snap-fit ​​drive shaft, characterized in that, The system includes a stator, which comprises a cylinder head and a cylinder block, which together form a spherical inner cavity. A spherical rotor is housed within the spherical inner cavity, with the spherical outer circumference of the rotor fitting into the cavity. The spherical rotor includes a piston with a spherical top surface and a turntable with a spherical bottom surface, connected by a cylindrical hinge. The turntable and the drive shaft used to drive its rotation are separate structures. A locking groove is recessed in the center of the spherical bottom surface of the turntable. The drive shaft is independent of the turntable, and a locking block that engages with the locking groove is provided at the upper end of the drive shaft. A gap is left between the locking block and the locking groove to allow the drive shaft to compensate for eccentricity relative to the turntable during rotation. 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 spherical 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 has a groove, and the upper end of the motor output shaft has 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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