A microspherical pump

Abstract

The patent discloses a micro spherical pump, a cylinder (5) has a hemispherical surface and a lower end of the hemispherical surface extends to form an inner cylindrical surface (501), a rotating sleeve hole (503) is connected to the inner spherical surface (502) of the cylinder (5), a piston pin seat (303) and a rotating disc pin seat (603) are matched to form a cylindrical hinge; an axis of the cylindrical hinge is arranged on an upper end surface of a rotating disc body and passes through the center of the upper end surface; a liquid inlet and outlet channel (604) is arranged on the rotating disc body; a distribution disc (7) is fixed to the lower end of the cylinder (5); a driving rotating disc shaft (601) is rotated, first and second working chambers (100 and 200) with alternating volumes are formed between the upper end surface of the rotating disc (6), the two side surfaces of the piston pin seat (303) and the inner spherical surface (502); the micro spherical pump has the advantages that the structure is simplified, the number of spherical matching pairs is reduced, and the processing and manufacturing are convenient; and the planar distribution structure is realized in the spherical pump.

Description

Technical Field

[0001] This patent relates to a hydraulic power component, particularly a miniature ball pump. Background Technology

[0002] Miniaturization has always been a key research objective in the field of hydraulic transmission. Miniature pumps possess significant advantages such as small size, light weight, and high power density, enabling simple and efficient solutions that are difficult to achieve with traditional hydraulic systems in many fields. They offer absolute advantages in applications with stringent requirements regarding the size, weight, efficiency, and reliability of power components. Ball pumps, as a novel type of micro-displacement pump, offer advantages such as small size, high power density, low vibration, simple structure, and high reliability.

[0003] However, current spherical pumps have many spherical mating pairs in their structure, such as the Chinese patent titled "Spherical Pump" with patent number 201910064805.5. The spherical machining requirements are high, and the numerous spherical mating pairs increase the machining difficulty and manufacturing cost. At the same time, since the flow distribution is performed on the spherical surface, high precision issues may lead to spherical leakage. These problems have an adverse impact on the output stability, volumetric efficiency, manufacturability, and processing cost of spherical pumps, and to some extent hinder the full realization of the advantages of spherical pumps. Summary of the Invention

[0004] The purpose of this patent is to design a miniature spherical pump that reduces the number of precision spherical mating pairs, effectively reduces the amount and difficulty of spherical machining, and achieves precise flow distribution.

[0005] The technical solution of this patent is: a miniature spherical pump, including a sliding sleeve, a cylinder, a piston, a turntable, and an oil distribution plate; the cylinder has a downward-opening hemispherical surface and an inner cylindrical surface extending downward from the lower end of the spherical surface; a rotating sleeve hole is connected to the inner spherical surface of the cylinder, and the axis of the rotating sleeve hole and the central axis of the inner cylindrical surface of the cylinder both pass through the center of the inner spherical surface and form an included angle α; the piston has a piston spherical surface, with a sliding shoe protruding upward from the center of the piston spherical surface, and a piston pin seat protruding downward from the lower end of the piston; the turntable has a cylindrical turntable body, with a turntable shaft protruding from the center of the lower end of the turntable body, and a turntable pin seat protruding upward from the upper end surface of the turntable body; the two end faces of the turntable pin seat are spherical surfaces adapted to the inner spherical surface of the cylinder, and the piston pin seat and the turntable pin seat are adapted to form a cylindrical hinge; the axis of the cylindrical hinge is set on the upper end surface of the turntable body and passes through the center of the upper end surface; on the two side planes of the turntable pin seat on the upper end surface of the turntable body... A fluid inlet and outlet channel is provided, running through the axial direction of the turntable body. An oil distribution plate is fixed to the lower end of the cylinder body, and an oil inlet groove and an oil outlet groove are provided on the upper surface of the oil distribution plate. The oil inlet groove and the oil outlet groove are respectively connected to the oil inlet hole and the oil outlet hole on the outer wall of the oil distribution plate. The piston and the turntable are connected by a cylindrical hinge and placed inside the cylinder body, with the turntable shaft extending from the center hole of the oil distribution plate. The sliding sleeve is placed inside the sleeve hole to form a rotational fit, and a sliding groove is provided on the lower surface of the sliding sleeve, allowing the sliding shoe to slide within the groove. Sealed dynamic fits are formed between the outer spherical portions of the piston spherical surface and the cylindrical hinge ends and the inner spherical surface of the cylinder body, between the cylindrical surface of the turntable and the inner cylindrical surface of the cylinder body, between the mating surfaces of the cylindrical hinge, and between the lower end face of the turntable body and the upper end face of the oil distribution plate. Driving the turntable shaft to rotate creates alternating volumes in the upper end face of the turntable, the two sides of the piston pin seat, and the inner spherical surface of the cylinder body.

[0006] Furthermore, the two parallel planes of the slipper are parallel to and symmetrically distributed on both sides of the axis of the cylindrical hinge.

[0007] Furthermore, the included angle α is between 5 and 20 degrees;

[0008] Furthermore, the piston pin seat is composed of a downward-protruding semi-cylinder at the lower end of the piston and a semi-cylinder hole with inward indentation at both ends. A central hole is provided at the center of the semi-cylinder, and the axis of the semi-cylinder hole, the axis of the semi-cylinder, and the axis of the central hole of the semi-cylinder coincide. The turntable pin seat is composed of a semi-cylinder protruding upward on both sides of the upper end face of the turntable cylinder and a semi-cylinder hole with inward indentation at the middle of the upper end face. A central hole is provided at the center of the semi-cylinders at both ends of the turntable pin seat, and the axis of the two semi-cylinders and their central holes coincides with the axis of the semi-cylinder hole. The central pin is inserted into the central holes of the piston pin seat and the turntable pin seat to form the cylindrical hinge.

[0009] Furthermore, the two ends of the cylindrical hinge above the upper end face of the turntable cylinder are spherical surfaces that are adapted to the inner spherical surface of the cylinder head, and the two ends of the center pin are spherical surfaces that are slightly lower than the spherical surfaces at both ends of the cylindrical hinge.

[0010] Furthermore, a sealing ring is provided on the rotating mating surface between the turntable shaft and the center hole of the oil distribution plate; a positioning ring and a sealing ring are provided at the connection between the upper end face of the oil distribution plate and the lower end of the cylinder block.

[0011] Furthermore, a limiting step is provided at the lower end of the rotating sleeve hole, and the sliding sleeve is pressed against the step of the rotating sleeve hole from the upper end to form a rotatable fit. The upper cover is fixedly pressed against the upper end face of the rotating sleeve hole, and a seal is provided at the connection between the upper cover and the end face of the rotating sleeve hole.

[0012] Furthermore, a lower cover is fixedly connected to the lower end face of the oil distribution plate, and a turntable shaft support hole is provided in the center of the lower cover. The turntable shaft passes through the center hole of the oil distribution plate and the turntable shaft support hole in sequence and exits the cylinder body. A bearing is provided in the turntable shaft support hole, and a spring retaining ring is provided on the outside of the bearing.

[0013] The advantages of this patent are:

[0014] 1) Simplified structure of spherical pump: The inner cavity of the cylinder is changed from the original spherical structure to a cylindrical inner cavity structure. The part of the turntable below the center of the spherical inner cavity is changed from an outer spherical surface to a cylindrical surface. The cylindrical surface is easier to process than the spherical surface. This reduces the amount of spherical surface processing and lowers the processing and manufacturing cost. At the same time, the cylindrical surface fit is structurally superior to the spherical surface fit, which improves the manufacturing yield from the design perspective.

[0015] 2) A planar distribution structure with precise flow control is implemented in the spherical pump, and the distribution envelope angle can be adjusted according to design requirements. The spherical pump distribution pair is changed from the original spherical distribution pair to a planar distribution pair, and the oil film changes from a spherical surface to a planar wedge shape. This reduces the oil film leakage area and objectively reduces the internal leakage (entering the working chamber or leaking to the lower cylinder) that originally occurred along the spherical surface to the housing, improving oil film stability and increasing volumetric efficiency. Attached Figure Description

[0016] Figure 1 Schematic diagram of a spherical pump;

[0017] Figure 2 : Figure 1 Sectional view of AA;

[0018] Figure 3 : Figure 2 BB section view;

[0019] Figure 4 Schematic diagram of the three-dimensional structure of a spherical pump;

[0020] Figure 5 Schematic diagram of cylinder block structure;

[0021] Figure 6 : Schematic diagram of the three-dimensional structure of the oil distribution plate;

[0022] Figure 7 Schematic diagram of the three-dimensional structure of the sliding groove sleeve;

[0023] Figure 8 : Schematic diagram of the piston's three-dimensional structure;

[0024] Figure 9 : Schematic diagram of the turntable's three-dimensional structure;

[0025] Figure 10 : Schematic diagram of the rotor's three-dimensional structure;

[0026] In the diagram: 1-Top cover; 2-Slide sleeve; 201-Slide; 3-Piston; 301-Slide shoe; 302-Piston spherical surface; 303-Piston pin seat; 4-Center pin; 5-Cylinder body; 501-Inner cylindrical surface; 502-Inner spherical surface; 503-Slide hole; 6-Turntable; 601-Turntable shaft; 602-Turntable cylindrical surface; 603-Turntable pin seat; 604-Inlet and outlet channels; 7-Oil distribution plate; 701-Inlet hole; 702-Outlet hole; 703-Inlet groove; 704-Outlet groove; 8-Bearing; 9-Lower cover; 10-Sealing ring; 100-First working chamber; 200-Second working chamber. Detailed Implementation

[0027] The spherical pump of this patent will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 5 As shown, the spherical pump described in this patent includes an upper cover 1, a sliding sleeve 2, a piston 3, a center pin 4, a cylinder 5, a turntable 6, an oil distribution plate 7, and a lower cover 9.

[0029] The lower end of the cylinder body 5 has an inner hemispherical surface, namely an inner spherical surface 502, with its opening facing downwards. The lower end of the inner spherical surface 502 passes through the center of the sphere, and extends downwards to form an inner cylindrical surface 501. A rotating sleeve hole 503 is connected to the inner spherical surface 502 of the cylinder body 5. The rotating sleeve hole 503 is located at the upper end of the cylinder body 5 and communicates with the inner spherical surface 502. A limiting step with a diameter smaller than the rotating sleeve hole is provided at the lower end of the rotating sleeve hole 503. The axis of the rotating sleeve hole 503 and the central axis of the inner cylindrical surface 501 of the cylinder body 5 both pass through the center of the inner spherical surface 502 and form an angle α, the size of which is 5 to 20 degrees. Figure 7As shown, the sliding sleeve 2 is a cylinder with a sliding groove 201 at the bottom. The sliding groove 201 of the sliding sleeve 2 is placed downward in the rotating sleeve hole 503, and the sliding sleeve 2 and the rotating sleeve hole 503 form a rotatable fit. The upper cover 1 is fixed and pressed on the upper end face of the rotating sleeve hole 503 by screws. A seal is provided at the connection between the upper cover 1 and the upper end face of the rotating sleeve hole 503 to prevent leakage of residual liquid in the cavity.

[0030] like Figure 8 As shown, piston 3 has a spherical top surface, namely piston spherical surface 302. A slipper 301 protrudes upward from the center of piston spherical surface 302, and a piston pin seat 303 protrudes downward from the lower end of piston 3. Piston pin seat 303 is composed of a semi-cylinder protruding downward from the middle of the lower end of piston 3 and semi-cylinder holes recessed inward at both ends. A central hole is provided in the center of the semi-cylinder. The axis of the semi-cylinder hole, the axis of the semi-cylinder, and the axis of the central hole of the semi-cylinder coincide. The planes between the two sides of piston pin seat 303 and piston spherical surface 302 are the two sides of piston pin seat.

[0031] like Figure 9 As shown, the turntable 6 has a cylindrical turntable body. The outer circumferential surface of the turntable body is the turntable cylindrical surface 602. A turntable shaft 601 protrudes from the center of the lower end of the turntable body. The turntable shaft 601 is used to connect the power mechanism and provide rotational support for the rotation of the turntable. A turntable pin seat 603 protrudes upward from the upper end surface of the turntable cylinder. The turntable pin seat 603 is composed of semi-cylinders protruding upward from both sides of the upper end surface of the turntable cylinder and a semi-cylinder hole recessed inward from the middle of the upper end surface. A center hole is provided at the center of the semi-cylinders at both ends of the turntable pin seat 603. The axis of the two semi-cylinders and their center hole coincides with the axis of the semi-cylinder hole. The axis of the center hole of the turntable pin seat 603 is on the upper end surface of the turntable cylinder and passes through the center of the upper end surface. The two end surfaces of the turntable pin seat 603 are spherical surfaces that are adapted to the spherical surface 502 inside the cylinder and are located above the axis of the center hole of the turntable pin seat 603. Liquid inlet and outlet channels 604 are respectively provided on both sides of the turntable pin seat on the upper end face of the turntable body, which run through the turntable body axially.

[0032] like Figure 10 As shown, piston pin seat 303 and turntable pin seat 603 are adapted to each other. A center pin 4 is inserted into the center hole of both piston pin seat 303 and turntable pin seat 603 to form a cylindrical hinge. The axis of the center pin 4 is the axis of the cylindrical hinge. The axis of the cylindrical hinge is located on the upper end face of the turntable body and passes through the center of the upper end face. The two ends of the cylindrical hinge above the upper end face of the turntable cylinder are spherical surfaces adapted to the inner spherical surface of the cylinder head. The two ends of the center pin are spherical surfaces slightly lower than the spherical surfaces at both ends of the cylindrical hinge. The two parallel surfaces of the slipper 301 are parallel to and symmetrically distributed on both sides of the axis of the cylindrical hinge.

[0033] like Figures 1 to 3 , Figure 6As shown, the oil distribution plate 7 is fixed to the lower end of the cylinder block 5 by screws. The upper surface of the oil distribution plate 7 is a smooth plane, made of a material with a low coefficient of friction and wear resistance. An oil inlet groove 703 and an oil outlet groove 704 are provided on the upper surface of the oil distribution plate 7. The upper surface of the oil distribution plate 7 can be rotatably attached to the lower surface of the turntable cylinder. The oil inlet groove 703 and the oil outlet groove 704 are on the same pitch circle as the oil inlet and outlet channels 604 on the turntable 6, and are opposite each other. The oil inlet groove 703 is connected to the oil inlet hole 701 on the outer wall of the oil distribution plate, and the oil outlet groove 704 is connected to the oil outlet hole 702 on the outer wall of the oil distribution plate. A lower cover 9 is fixedly connected to the lower surface of the oil distribution plate 7. A turntable shaft support hole is provided in the center of the lower cover 9. The turntable shaft 601 passes through the center hole of the oil distribution plate and the turntable shaft support hole in sequence and exits the cylinder block 5. A bearing 8 is provided in the turntable shaft support hole, and a spring retaining ring is provided on the outside of the bearing 8.

[0034] The upper cover 1, cylinder body 5, oil distribution plate 7, and lower cover 9 are sequentially fixed together by screws to form the stator. The sliding shoe sleeve 2, piston 3, and turntable 6 are sequentially connected to form the rotor. The rotor is placed inside the stator. The sliding sleeve 2 is placed in the sleeve hole 503 to form a rotational fit. The sliding shoe 301 is placed in the groove 201 on the lower end face of the sliding sleeve 2. The two parallel surfaces of the sliding shoe 301 are in contact with the two sides of the groove 201 to form a sliding fit. The turntable shaft 601 extends from the center hole of the oil distribution plate 7. The piston spherical surface 3... The outer spherical portion at both ends of the cylindrical hinge 02 and the spherical surface 502 inside the cylinder, the cylindrical surface 602 of the turntable and the cylindrical surface 501 inside the cylinder, the mating surfaces of the cylindrical hinge, and the lower end face of the cylindrical turntable and the upper end face of the oil distribution plate 7 are all sealed dynamic fits; the turntable shaft 601 is driven to rotate, forming a first working chamber 100 and a second working chamber 200 with alternating volumes between the upper end face of the cylinder of the turntable 6, the two sides of the piston pin seat 303 and the spherical surface 502 inside the cylinder.

[0035] As the turntable shaft 601 rotates, the first working chamber 100 and the second working chamber 200 alternately perform liquid suction and discharge. When the first working chamber 100 needs to suction liquid, the liquid inlet and outlet channel 604 on the turntable that is connected to the working chamber is dynamically connected to the liquid inlet groove 703 on the oil distribution plate 7. The liquid inlet groove 703 is connected to the liquid inlet hole 701, which is connected to the liquid source pipeline, thereby drawing liquid from the pipeline. During liquid suction, the volume of the first working chamber 100 continuously increases. After the liquid suction is completed, the volume reaches the maximum state, and the liquid suction is completed. Then the volume gradually decreases and the discharge begins. While the first chamber 100 is absorbing liquid, the second chamber 200 is dynamically connected to the drain trough 704 on the oil distribution plate 7 via another inlet / outlet channel 604 for draining liquid. The drain trough 704 is connected to the drain hole 702, through which high-pressure liquid is discharged. During draining, the volume of the second chamber 200 continuously decreases, reaching its minimum volume after draining is complete. Then, the volume gradually increases again to begin absorbing liquid.

Claims

1. A miniature spherical pump, characterized in that: The system includes a sliding sleeve (2), a cylinder (5), a piston (3), a turntable (6), and an oil distribution plate (7). The cylinder (5) has a downward-facing hemispherical surface and an inner cylindrical surface (501) extending downward from the lower end of the spherical surface. A rotating sleeve hole (503) is connected to the inner spherical surface (502) of the cylinder (5). The axis of the rotating sleeve hole (503) and the central axis of the inner cylindrical surface (501) both pass through the center of the inner spherical surface (502) and form an angle α. The piston (3) has a piston spherical surface (302), and a sliding shoe (301) protrudes upward from the center of the piston spherical surface (302). A piston pin seat (303) protrudes downward from the lower end of the piston (3); the turntable (6) has a cylindrical turntable body, with a turntable shaft (601) protruding from the center of the lower end of the turntable body, and a turntable pin seat (603) protruding upward from the upper end surface of the turntable body. The two end faces of the turntable pin seat (603) are spherical surfaces adapted to the inner spherical surface (502). The piston pin seat (303) and the turntable pin seat (603) are adapted to form a cylindrical hinge; the axis of the cylindrical hinge is set on the upper end surface of the turntable body and passes through the center of the upper end surface; a liquid inlet and outlet channel (604) is provided on the upper end surface of the turntable body, which runs through the axial direction of the turntable body; The oil pan (7) is fixed at the lower end of the cylinder body (5). An oil inlet groove (703) and an oil outlet groove (704) are provided on the upper surface of the oil distribution pan (7). The oil inlet groove (703) and the oil outlet groove (704) are respectively connected to the oil inlet hole (701) and the oil outlet hole (702) on the outer wall of the oil distribution pan. The piston (3) and the turntable (6) are connected by a cylindrical hinge and placed inside the cylinder body (5). The turntable shaft (601) extends from the center hole of the oil distribution pan. The sliding sleeve (2) is placed inside the rotating sleeve hole (503) to form a rotational fit. A sliding groove (201) is provided on the lower surface of the sliding sleeve (2). The boot (301) can be slidably placed in the groove (201); a sealed dynamic fit is formed between the outer spherical part of the piston spherical surface (302) and the inner spherical surface (502) at both ends of the cylindrical hinge, between the cylindrical surface of the turntable (602) and the inner cylindrical surface (501), between the mating surfaces of the cylindrical hinge, and between the lower end face of the turntable body and the upper end face of the oil distribution plate; the turntable shaft (601) is driven to rotate, and a first working chamber (100) and a second working chamber (200) with alternating volumes are formed between the upper end face of the turntable (6), the two sides of the piston pin seat (303) and the inner spherical surface (502).

2. A miniature spherical pump according to claim 1, characterized in that: The two parallel surfaces of the slipper (301) are parallel to and symmetrically distributed on both sides of the axis of the cylindrical hinge.

3. A miniature spherical pump according to claim 1, characterized in that: The included angle α is between 5 and 20 degrees.

4. A miniature spherical pump according to claim 1, characterized in that: The piston pin seat (303) is composed of a semi-cylinder protruding downward from the middle of the lower end of the piston (3) and a semi-cylinder hole recessed inward at both ends. A central hole is provided in the center of the semi-cylinder, and the axis of the semi-cylinder hole, the axis of the semi-cylinder, and the axis of the central hole of the semi-cylinder coincide. The turntable pin seat (603) is composed of a semi-cylinder protruding upward from both sides of the upper end face of the turntable cylinder and a semi-cylinder hole recessed inward in the middle of the upper end face. A central hole is provided in the center of the semi-cylinders at both ends of the turntable pin seat (603), and the axis of the two semi-cylinders and their central holes coincides with the axis of the semi-cylinder hole. The central pin (4) is inserted into the central holes of the piston pin seat (303) and the turntable pin seat (603) to form the cylindrical hinge.

5. A miniature spherical pump according to claim 4, characterized in that: The two ends of the cylindrical hinge are spherical surfaces that are adapted to the spherical surface (502) inside the cylinder, and the two ends of the center pin (4) are spherical surfaces that are slightly lower than the spherical surfaces at both ends of the cylindrical hinge.

6. A miniature ball pump according to any one of claims 1 to 5, characterized in that: A sealing ring (10) is provided on the rotating mating surface between the turntable shaft (601) and the center hole of the oil distribution plate; a positioning ring and a sealing ring are provided at the connection between the upper end face of the oil distribution plate (7) and the lower end of the cylinder body (5).

7. A miniature ball pump according to any one of claims 1 to 5, characterized in that: in A limiting step is provided on the lower end of the rotating sleeve hole (503). The sliding groove rotating sleeve (2) is pressed on the step of the rotating sleeve hole (503) from the upper end to form a rotatable fit. The upper cover (1) is fixedly pressed on the upper end face of the rotating sleeve hole (503). A seal is provided at the connection between the upper cover (1) and the end face of the rotating sleeve hole (503).

8. A miniature ball pump according to any one of claims 1 to 5, characterized in that: in The lower end face of the oil distribution plate (7) is fixedly connected to the lower cover (9). A turntable shaft support hole is provided in the center of the lower cover (9). The turntable shaft (601) passes through the center hole of the oil distribution plate and the turntable shaft support hole in sequence and exits the cylinder body. A bearing (8) is provided in the turntable shaft support hole. A spring retaining ring is provided on the outside of the bearing (8).

Images