CN113586438A

CN113586438A - Short-amplitude inner cycloid type pump

Info

Publication number: CN113586438A
Application number: CN202110843324.1A
Authority: CN
Inventors: 宋富祥
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-26
Filing date: 2021-07-26
Publication date: 2021-11-02

Abstract

The invention provides a short-amplitude hypocycloid pump, which belongs to the technical field of mechanical manufacturing and comprises a pump body, a pump cover and a pump cover, wherein the pump cover is arranged on the pump body; the stator, be provided with slewing mechanism on the stator, grafting mechanism, stop gear, sealing mechanism, pressure release mechanism, slewing mechanism is connected with stop gear, slewing mechanism is connected with grafting mechanism, slewing mechanism includes the rotor, first pivot and third hexagonal bolt, the rotor rotates to be connected in the stator, first pivot is connected in the upper end of rotor, third hexagonal bolt is provided with four, the equal threaded connection of every third hexagonal bolt is in the lower part position of first pivot, and the equal activity of every third hexagonal bolt runs through first pivot and extends to the upper portion position of rotor, grafting mechanism includes the inserted block, the second spring, the third stopper, the mounting groove, the ball, connecting block and slot, inserted block fixed connection is in the lower extreme of rotor, the connecting block sets up in the downside position of inserted block, the slot is excavated in the upper end of connecting block.

Description

Short-amplitude inner cycloid type pump

Technical Field

The invention belongs to the technical field of machine manufacturing, and particularly relates to a short-amplitude inner cycloid type pump.

Background

In the prior art, a single screw pump belongs to a rotor type displacement pump, which transfers liquid by means of volume change generated in a suction chamber and a discharge chamber by mutual meshing of a screw and a bushing. The main working parts of the internal engaged closed screw pump are composed of a lining (stator) with a double-head spiral cavity and a single-head spiral screw (rotor) engaged with the lining in the stator cavity. When the input shaft drives the rotor to make planetary rotation around the stator center by means of universal joint, the stator and rotor pair are continuously meshed to form sealed cavities, these sealed cavities can make constant-speed axial movement, and can be used for conveying medium from suction end to discharge end, and the medium sucked into the sealed cavity can be passed through the stator, and can not be stirred and damaged.

The existing single-screw pump is basically characterized in that a rotor is connected with a universal joint, the rotor rotates to drive the rotor to rotate, but only one end of each of two ends of a plurality of rotors is connected, so that the rotor is unstable during rotation, the rotor and the universal joint are basically fixedly connected, the rotor cannot be quickly repaired after being damaged, and the use of the pump is influenced.

Disclosure of Invention

The invention aims to provide a short-amplitude hypocycloid pump, and aims to solve the problems that in the prior art, a rotor cannot rotate stably and cannot be repaired quickly after being damaged.

In order to achieve the purpose, the invention provides the following technical scheme:

a short-amplitude inner cycloid type pump comprises a stator, wherein a rotating mechanism, an inserting mechanism, a limiting mechanism, a sealing mechanism and a pressure relief mechanism are arranged on the stator, the rotating mechanism is connected with the limiting mechanism, the rotating mechanism is connected with the inserting mechanism, the rotating mechanism comprises a rotor, a first rotating shaft and third hexagonal bolts, the rotor is rotatably connected in the stator, the first rotating shaft is connected to the upper end of the rotor, four third hexagonal bolts are arranged, each third hexagonal bolt is in threaded connection with the lower portion of the first rotating shaft, each third hexagonal bolt movably penetrates through the first rotating shaft and extends to the upper portion of the rotor, the inserting mechanism comprises an inserting block, a second spring, a third limiting block, a mounting groove, a round ball, a connecting block and a slot, the inserting block is fixedly connected to the lower end of the rotor, and the connecting block is arranged at the lower side of the inserting block, the slot is cut in the upper end of connecting block, the inserted block activity is pegged graft in the slot, the mounting groove is provided with four, four the mounting groove is all cut on the inserted block, the second spring is provided with four, every the second spring is fixed connection respectively and keeps away from an inner wall of connecting block in every mounting groove, the ball is provided with four, four the ball is located four mounting grooves respectively, the third stopper is provided with four, four third stopper is fixed connection respectively on the circumference surface of four balls, four third stopper is fixed connection respectively in the one end that four second springs are close to the connecting block.

Preferably, a fourth hexagon bolt is connected to the outer circumferential surface of the connecting block in a threaded manner, and the fourth hexagon bolt movably penetrates through the connecting block and extends to the surface of the inserting block.

Preferably, the upper end of the stator is movably inserted with the discharge box, the lower end of the stator is movably inserted with the suction box, the lower position of the discharge box is movably inserted with four second hexagonal bolts, the four second hexagonal bolts movably penetrate through the upper parts of the stator and the suction box and extend to the outer side of the suction box, and the surfaces of the four second hexagonal bolts are all in threaded connection with nuts.

Preferably, the limiting mechanism includes a limiting groove and a first limiting block, the first limiting block is fixedly connected to the upper end of the first rotating shaft, the limiting groove is cut on the upper inner wall of the discharge box, and the first limiting block is rotatably connected to the inside of the limiting groove.

Preferably, the lower end of the suction box is connected with a partition box, the lower position of the suction box is in threaded connection with four first hexagonal bolts, and the four first hexagonal bolts movably penetrate through the suction box and extend to the upper position of the partition box.

Preferably, the sealing mechanism comprises four filler seats, four supporting blocks and a supporting plate, the filler seats are arranged at the joint of the suction box and the partition box, the four supporting blocks are all fixedly connected to the lower end of the filler seats, the supporting plate is fixedly connected to the circumferential inner wall of the partition box, and the four supporting blocks are all movably inserted into the upper end of the supporting plate.

Preferably, the inner circumferential wall of the stator is provided with an insertion hole, the pressure relief mechanism includes a pressure relief shell, a screw, a pressure relief opening, a first spring and a second limiting block, the pressure relief shell is fixedly connected to the outer circumferential surface of the stator, the screw is in threaded connection with one end of the pressure relief shell far away from the stator, the screw movably penetrates through the pressure relief shell and extends into the insertion hole, the second limiting block is fixedly connected to the surface of the screw, the second limiting block is located in the pressure relief shell, the first spring is fixedly connected to one end of the second limiting block far away from the stator, the first spring is sleeved on the surface of the screw, and the pressure relief opening is arranged at one end of the pressure relief shell far away from the stator.

Preferably, the lower end of the connecting block is fixedly connected with a universal joint, the universal joint is located in the suction box, the lower end of the universal joint is fixedly connected with a second rotating shaft, the second rotating shaft movably penetrates through the filler seat and the partition box and extends to the outer side of the partition box, a bearing is rotatably connected to the circumferential surface of the second rotating shaft and is mounted at the lower position of the partition box, a coupler is mounted at the lower end of the second rotating shaft, and the lower end of the coupler is fixedly connected with the output end of the driving motor.

Preferably, one end of the screw rod, which is far away from the second limiting block, is fixedly connected with the operating block.

Preferably, the slot is cross-shaped, and the lower part of the insert block is matched with the slot.

Compared with the prior art, the invention has the beneficial effects that:

1. in this scheme, through being connected between first pivot and the rotor, fixed connection between first pivot and the first stopper, first stopper rotates to be connected in the spacing inslot, can make rotor pivoted more stable effectively for the rotor is not fragile, pegs graft in the slot through the inserted block activity, makes the convenient maintenance in rotor damage rear, through the structural design of filler seat, makes suction box and cut off and separate between the case.

2. In this scheme, be provided with pressure release mechanism through on the stator and make when the pump needs the maintenance, can let out the pressure in the pump through pressure release mechanism.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is a schematic view of a partial cross-sectional structure of the present invention;

FIG. 4 is an enlarged view of the structure at A in FIG. 3 according to the present invention;

FIG. 5 is an enlarged view of the structure at B in FIG. 3 according to the present invention;

fig. 6 is a partial exploded view of the present invention.

In the figure: 1. a stator; 2. a suction box; 3. a partition box; 4. a drive motor; 5. a first hexagon bolt; 6. a nut; 7. a discharge tank; 8. a second hexagon bolt; 9. a pressure relief port; 10. the operation is fast; 11. a screw; 12. a pressure relief shell; 13. a coupling; 14. a first rotating shaft; 15. a third hexagon bolt; 16. a rotor; 17. a universal joint; 18. a first stopper; 19. a support plate; 20. a bearing; 21. a second rotating shaft; 22. a support block; 23. a filler seat; 24. a second limiting block; 25. a jack; 26. a first spring; 27. inserting a block; 28. a second spring; 29. a third limiting block; 30. mounting grooves; 31. a ball; 32. a fourth hexagon bolt; 33. connecting blocks; 34. a slot; 35. a limiting groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1-6, the present invention provides the following technical solutions: a short-amplitude hypocycloid pump comprises a stator 1, wherein a rotating mechanism, an inserting mechanism, a limiting mechanism, a sealing mechanism and a pressure relief mechanism are arranged on the stator 1, the rotating mechanism is connected with the limiting mechanism, the rotating mechanism is connected with the inserting mechanism, the rotating mechanism comprises a rotor 16, a first rotating shaft 14 and three hexagonal bolts 15, the rotor 16 is rotatably connected in the stator 1, the first rotating shaft 14 is connected to the upper end of the rotor 16, four third hexagonal bolts 15 are arranged, each third hexagonal bolt 15 is in threaded connection with the lower part of the first rotating shaft 14, each third hexagonal bolt 15 movably penetrates through the first rotating shaft 14 and extends to the upper part of the rotor 16, the inserting mechanism comprises an inserting block 27, a second spring 28, a third limiting block 29, a mounting groove 30, a round ball 31, a connecting block 33 and an inserting groove 34, the inserting block 27 is fixedly connected to the lower end of the rotor 16, the connecting block 33 is arranged at the lower side of the inserting block 27, slot 34 cuts in the upper end of connecting block 33, inserted block 27 activity is pegged graft in slot 34, mounting groove 30 is provided with four, four mounting grooves 30 are all cut on inserted block 27, second spring 28 is provided with four, every second spring 28 is fixed connection respectively in an inner wall that every mounting groove 30 keeps away from connecting block 33, ball 31 is provided with four, four balls 31 are located four mounting grooves 30 respectively, third stopper 29 is provided with four, four third stoppers 29 are fixed connection respectively on the circumference surface of four balls 31, four third stoppers 29 are fixed connection respectively in the one end that four second springs 28 are close to connecting block 33.

In the embodiment of the invention, the first rotating shaft 14 is connected with the rotor 16 through the third hexagon bolt 15, so that the first rotating shaft 14 and the rotor 16 can be conveniently detached and installed, the insertion block 27 is movably inserted into the insertion slot 34, so that the detachment and installation between the insertion block 27 and the connecting block 33 can be realized, the installation slot 30 is used for installing the third limiting block 29, the second spring 28 and the round ball 31, the round ball 31 can move to drive the third limiting block 29 to move through the fixed connection between the round ball 31 and the third limiting block 29, the compression of the second spring 28 can be realized through the fixed connection between the second spring 28 and the third limiting block 29, the output end of the driving motor 4 rotates to drive the coupler 13 to rotate, the coupler 13 rotates to drive the second rotating shaft 21 to rotate, the second rotating shaft 21 rotates to drive the universal joint 17 to rotate, the universal joint 17 rotates to drive the connecting block 33 to rotate, connecting block 33 rotates and drives the inserted block 27 and rotate, inserted block 27 rotates and drives rotor 16 to rotate, rotor 16 rotates and drives first pivot 14 and rotates, first pivot 14 rotates and drives first stopper 18 and rotates, first stopper 18 rotates the position of first pivot 14 of restriction, the rotation operation is fast 10, the operation is fast 10 and rotates and drive screw rod 11 and rotate, rotate screw rod 11 and make screw rod 11 remove from jack 25, make pressure release through jack 25, the pressure of rethread pressure release 9 in with the pump is completely released.

Specifically, as shown in fig. 5, a fourth hexagon bolt 32 is threadedly connected to the outer circumferential surface of the connecting block 33, and the fourth hexagon bolt 32 movably penetrates through the connecting block 33 and extends to the surface of the inserting block 27.

In this embodiment: the fourth hexagon bolt 32 is connected to the outer circumferential surface of the connecting block 33 in a threaded manner, and the fourth hexagon bolt 32 movably penetrates through the connecting block 33 and extends to the surface of the insert block 27, so that the insert block 27 can be fixed.

Specifically, as shown in fig. 3, the upper end of the stator 1 is movably inserted with the discharge box 7, the lower end of the stator 1 is movably inserted with the suction box 2, the lower portion of the discharge box 7 is movably inserted with four second hex bolts 8, the four second hex bolts 8 movably penetrate through the upper portions of the stator 1 and the suction box 2 and extend to the outer side of the suction box 2, and the surfaces of the four second hex bolts 8 are all connected with the nuts 6 by threads.

In this embodiment: the mounting and dismounting between the discharge casing 7 and the suction casing 2 can be achieved by the second hexagon bolts 8 and the nuts 6.

Specifically, please refer to fig. 3, the limiting mechanism includes a limiting groove 35 and a first limiting block 18, the first limiting block 18 is fixedly connected to the upper end of the first rotating shaft 14, the limiting groove 35 is cut on the upper inner wall of the discharging box 7, and the first limiting block 18 is rotatably connected to the limiting groove 35.

In this embodiment: the limiting mechanism comprises a limiting groove 35 and a first limiting block 18, the first limiting block 18 is fixedly connected to the upper end of the first rotating shaft 14, the limiting groove 35 is cut in the upper inner wall of the discharge box 7, the first limiting block 18 is rotatably connected to the limiting groove 35, limiting of the first rotating shaft 14 can be achieved, and the rotor 16 can be rotated more stably.

Specifically, as shown in fig. 3, the lower end of the suction box 2 is connected to a partition box 3, the lower portion of the suction box 2 is connected to four first hexagon bolts 5 through threads, and the four first hexagon bolts 5 are all movably inserted through the suction box 2 and extend to the upper portion of the partition box 3.

In this embodiment: the lower end of the suction box 2 is connected with the partition box 3, the lower portion of the suction box 2 is in threaded connection with four first hexagonal bolts 5, the four first hexagonal bolts 5 penetrate through the suction box 2 and extend to the upper portion of the partition box 3, and the suction box 2 and the partition box 3 can be detached and installed through the first hexagonal bolts 5.

Specifically, as shown in fig. 3, the sealing mechanism includes a packing seat 23, four supporting blocks 22 and a supporting plate 19, the packing seat 23 is installed at a joint of the suction box 2 and the partition box 3, the four supporting blocks 22 are provided, the four supporting blocks 22 are all fixedly connected to a lower end of the packing seat 23, the supporting plate 19 is fixedly connected to a circumferential inner wall of the partition box 3, and the four supporting blocks 22 are all movably inserted into an upper end of the supporting plate 19.

In this embodiment: the suction box 2 and the partition box 3 can be separated by the filler seat 23, and the support block 22 can support the filler seat 23 by movably inserting the support block 22 and the support plate 19.

As shown in fig. 3 and 4, a jack 25 is drilled on the inner circumferential wall of the stator 1, the pressure relief mechanism includes a pressure relief shell 12, a screw 11, a pressure relief opening 9, a first spring 26 and a second limiting block 24, the pressure relief shell 12 is fixedly connected to the outer circumferential surface of the stator 1, the screw 11 is in threaded connection with one end of the pressure relief shell 12 far away from the stator 1, the screw 11 movably penetrates through the pressure relief shell 12 and extends into the jack 25, the second limiting block 24 is fixedly connected to the surface of the screw 11, the second limiting block 24 is located in the pressure relief shell 12, the first spring 26 is fixedly connected to one end of the second limiting block 24 far away from the stator 1, the first spring 26 is sleeved on the surface of the screw 11, and the pressure relief opening 9 is disposed at one end of the pressure relief shell 12 far away from the stator 1.

In this embodiment: pressure release shell 12 is used for installing screw rod 11, pegs graft in jack 25 through the activity of screw rod 11, can realize dismantling and installing between screw rod 11 and the jack 25, through fixed connection between screw rod 11 and the second stopper 24, can realize that screw rod 11 removes and drives second stopper 24 and remove, through fixed connection between second stopper 24 and the first spring 26, can realize the compression of first spring 26.

Specifically please refer to fig. 3, a universal joint 17 is fixedly connected to a lower end of the connecting block 33, the universal joint 17 is located in the suction box 2, a second rotating shaft 21 is fixedly connected to a lower end of the universal joint 17, the second rotating shaft 21 movably penetrates through the packing seat 23 and the partition box 3 and extends to an outer side of the partition box 3, a bearing 20 is rotatably connected to a circumferential surface of the second rotating shaft 21, the bearing 20 is installed at a lower position of the partition box 3, a coupler 13 is installed at a lower end of the second rotating shaft 21, and an output end of a driving motor 4 is fixedly connected to a lower end of the coupler 13.

In this embodiment: through fixed connection between driving motor 4 and shaft coupling 13, can realize shaft coupling 13's rotation, through being connected between shaft coupling 13 and the second pivot 21, can realize that shaft coupling 13 rotates and drives second pivot 21 and rotate, through fixed connection between second pivot 21 and the universal joint 17, can realize that second pivot 21 rotates and drives the universal joint 17 and rotate, through fixed connection between universal joint 17 and the connecting block 33, can realize that universal joint 17 rotates and drives connecting block 33 and rotate.

Specifically, please refer to fig. 4, one end of the screw 11 away from the second stopper 24 is fixedly connected with the operating block 10.

In this embodiment: the operation block 10 is fixedly connected with one end of the screw rod 11 far away from the second limiting block 24, so that the screw rod 11 can be conveniently rotated.

Specifically, as shown in fig. 6, the slot 34 is cross-shaped, and the lower portion of the insert 27 matches with the slot 34.

In this embodiment: by the shape of the slot 34 being cruciform, the lower part of the insert 27 matches the slot 34 so that the insert 27 does not rotate when the insert 27 is inserted into the slot 34.

The working principle and the using process of the invention are as follows: output through driving motor 4 rotates and drives shaft coupling 13 and rotate, shaft coupling 13 rotates and drives ball 31 and rotate, second pivot 21 rotates and drives universal joint 17 and rotates, universal joint 17 rotates and drives connecting block 33 and rotates, connecting block 33 rotates and drives inserted block 27 and rotates, inserted block 27 rotates and drives rotor 16 and rotates, rotor 16 rotates and drives first pivot 14 and rotates, first pivot 14 rotates and drives first stopper 18 and rotate, first stopper 18 rotates the position of first pivot 14 of restriction, the rotation operation is fast 10, the operation is fast 10 rotates and drives screw rod 11 and rotate, it makes screw rod 11 remove from jack 25 to rotate screw rod 11, make pressure let out through jack 25, the pressure in the pump is let out completely to the rethread pressure relief port 9.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A short-amplitude hypocycloid pump is characterized in that: including stator (1), be provided with slewing mechanism, grafting mechanism, stop gear, sealing mechanism, pressure release mechanism on stator (1), slewing mechanism is connected with stop gear, slewing mechanism is connected with grafting mechanism, slewing mechanism includes rotor (16), first pivot (14) and third hexagonal bolt (15), rotor (16) rotate to be connected in stator (1), first pivot (14) are connected in the upper end of rotor (16), third hexagonal bolt (15) are provided with four, every equal threaded connection in the lower part position of first pivot (14) of third hexagonal bolt (15), and every third hexagonal bolt (15) all activity run through first pivot (14) and extend to the upper portion position of rotor (16), grafting mechanism includes inserted block (27), second spring (28), third stopper (29), The rotor comprises mounting grooves (30), round balls (31), connecting blocks (33) and slots (34), wherein the inserting blocks (27) are fixedly connected to the lower end of the rotor (16), the connecting blocks (33) are arranged at the lower side positions of the inserting blocks (27), the slots (34) are formed in the upper ends of the connecting blocks (33), the inserting blocks (27) are movably inserted into the slots (34), four mounting grooves (30) are formed, the four mounting grooves (30) are all formed in the inserting blocks (27), the number of the second springs (28) is four, each second spring (28) is fixedly connected to the inner wall, away from the connecting blocks (33), of each mounting groove (30), the number of the round balls (31) is four, the four round balls (31) are respectively located in the four mounting grooves (30), the number of the third limiting blocks (29) is four, the four third limiting blocks (29) are respectively fixedly connected to the circumferential surfaces of the four round balls (31), the four third limiting blocks (29) are respectively and fixedly connected to one ends, close to the connecting blocks (33), of the four second springs (28).

2. A short-amplitude hypocycloidal pump according to claim 1 wherein: the outer circumferential surface of the connecting block (33) is in threaded connection with a fourth hexagonal bolt (32), and the fourth hexagonal bolt (32) movably penetrates through the connecting block (33) and extends to the surface of the inserting block (27).

3. A short-amplitude hypocycloidal pump according to claim 2 wherein: the upper end activity of stator (1) is pegged graft and is had discharge box (7), the lower extreme activity of stator (1) is pegged graft and is had suction box (2), the lower part position activity of discharge box (7) is pegged graft and is had four second hex bolts (8), and four second hex bolts (8) activities run through the upper portion of stator (1) and suction box (2) and extend to the outside of suction box (2), four equal threaded connection has nut (6) on the surface of second hex bolts (8).

4. A short-amplitude hypocycloidal pump according to claim 3 wherein: stop gear includes spacing groove (35) and first stopper (18), first stopper (18) fixed connection is in the upper end of first pivot (14), spacing groove (35) are dug in the last inner wall of discharge box (7), first stopper (18) rotate to be connected in spacing groove (35).

5. A short-amplitude hypocycloidal pump according to claim 4 wherein: the lower extreme of suction box (2) is connected with cuts off case (3), the lower part position threaded connection of suction box (2) has four first hex bolts (5), and four first hex bolts (5) all activity run through suction box (2) and extend to the upper portion position of cutting off case (3).

6. A short-amplitude hypocycloidal pump according to claim 5 wherein: the sealing mechanism comprises filler seats (23), four supporting blocks (22) and supporting plates (19), wherein the filler seats (23) are installed at the joint of the suction box (2) and the partition box (3), the number of the supporting blocks (22) is four, the supporting blocks (22) are fixedly connected to the lower end of the filler seats (23), the supporting plates (19) are fixedly connected to the inner wall of the circumference of the partition box (3), and the four supporting blocks (22) are movably inserted into the upper ends of the supporting plates (19).

7. A short-amplitude hypocycloidal pump according to claim 6 wherein: the inner wall of the circumference of the stator (1) is provided with an insertion hole (25), the pressure relief mechanism comprises a pressure relief shell (12), a screw rod (11), a pressure relief opening (9), a first spring (26) and a second limiting block (24), the pressure relief shell (12) is fixedly connected to the outer circumferential surface of the stator (1), the screw rod (11) is in threaded connection with one end of the pressure relief shell (12) far away from the stator (1), and the screw rod (11) movably penetrates through the pressure relief shell (12) and extends into the insertion hole (25), the second limiting block (24) is fixedly connected to the surface of the screw rod (11), the second limiting block (24) is positioned in the pressure relief shell (12), the first spring (26) is fixedly connected to one end, far away from the stator (1), of the second limiting block (24), and the first spring (26) is sleeved on the surface of the screw rod (11), and the pressure relief opening (9) is arranged at one end of the pressure relief shell (12) far away from the stator (1).

8. A short-amplitude hypocycloidal pump according to claim 7 wherein: the lower extreme fixedly connected with universal joint (17) of connecting block (33), and universal joint (17) are located suction box (2), the lower extreme fixedly connected with second pivot (21) of universal joint (17), and second pivot (21) activity run through packing seat (23) and cut off case (3) and extend to the outside of cutting off case (3), the circumference of second pivot (21) is rotated on the surface and is connected with bearing (20), and bearing (20) install in the lower part position of cutting off case (3), shaft coupling (13) are installed to the lower extreme of second pivot (21), the output of the lower extreme fixedly connected with driving motor (4) of shaft coupling (13).

9. A short-amplitude hypocycloidal pump according to claim 8 wherein: one end of the screw rod (11) far away from the second limiting block (24) is fixedly connected with an operating block (10).

10. A short-amplitude hypocycloidal pump according to claim 9 wherein: the shape of the slot (34) is cross-shaped, and the lower part of the insert block (27) is matched with the slot (34).