CN113638870B

CN113638870B - Diaphragm vacuum pump

Info

Publication number: CN113638870B
Application number: CN202111013629.6A
Authority: CN
Inventors: 陈宇航; 程实
Original assignee: Zhengzhou Greatwall Scientific Industrial And Trading Co ltd
Current assignee: Zhengzhou Greatwall Scientific Industrial And Trading Co ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2023-07-25
Anticipated expiration: 2041-08-31
Also published as: CN113638870A

Abstract

The invention relates to the technical field of vacuum pumps, in particular to a diaphragm vacuum pump. The diaphragm vacuum pump comprises a shell, wherein a feed inlet and a discharge outlet are formed in the shell, a driving mechanism is arranged on the inner wall of the shell, a pneumatic mechanism is arranged on the inner wall of the shell, a first cylinder body and a second cylinder body are fixedly connected to the inner wall of the shell, a diaphragm body is arranged in each of the first cylinder body and the second cylinder body, a slowing mechanism is arranged at the joint of each of the first cylinder body and the second cylinder body and the diaphragm, a fastening bolt is arranged on each diaphragm body, a first fixing plate and a second fixing plate are arranged on each diaphragm body, the first fixing plates and the second fixing plates are respectively arranged on two sides of each diaphragm body, a second sealing gasket is fixedly connected to the outer wall of each first fixing plate, a first connecting pipe is arranged on each first cylinder body, and a second connecting pipe is arranged on each second cylinder body; the invention has simple operation, saves energy, reduces complex structure, reduces failure rate of the device and improves practicability of the device.

Description

Diaphragm vacuum pump

Technical Field

The invention relates to the technical field of vacuum pumps, in particular to a diaphragm vacuum pump.

Background

The diaphragm pump is actually a embolic pump, and the infusion body is separated from the plunger and the pump cylinder by a thin film, so that the plunger and the pump cylinder are protected. The part of the left side of the diaphragm, which is contacted with the liquid, is made of a corrosion-resistant material or coated with a corrosion-resistant substance, and the right side of the diaphragm is filled with water or oil.

The reciprocating vacuum pump is widely applied at present due to compact structure and strong suction capability, particularly in the field of vacuum filtration, and is used for extracting gas in a liquid storage bottle and a filter bottle so as to enable filtered liquid to smoothly flow down.

In the existing diaphragm vacuum pump, the diaphragm needs to be repeatedly turned over at two sides, so that the diaphragm is easy to damage at the turning over position.

Disclosure of Invention

The invention aims to solve the problem that a diaphragm is easy to damage in the prior art, and provides a diaphragm vacuum pump.

In order to achieve the above purpose, the present invention adopts the following technical scheme: the utility model provides a diaphragm vacuum pump, includes the shell, be equipped with feed inlet and discharge gate on the shell, the shell inner wall is equipped with actuating mechanism, the shell inner wall is equipped with pneumatic mechanism, shell inner wall fixedly connected with first cylinder body and second cylinder body, first cylinder body and second cylinder body are the outside square interior circle, all be equipped with the diaphragm body in first cylinder body and the second cylinder body, be equipped with first connecting pipe on the first cylinder body, be equipped with the second connecting pipe on the second cylinder body, be equipped with first check valve and second check valve on the first connecting pipe, be equipped with third check valve and fourth check valve on the second connecting pipe, first recess has been seted up in the department of combining with the diaphragm body to first cylinder body and second cylinder body, be equipped with in the first recess and slow down the mechanism.

Preferably, the diaphragm body is provided with a fastening bolt, the diaphragm body is provided with a first fixing plate and a second fixing plate, the first fixing plate and the second fixing plate are respectively arranged on two sides of the diaphragm body, the outer wall of the first fixing plate is fixedly connected with a second sealing gasket, the outer wall of the second fixing plate is fixedly connected with a first sealing gasket, the second fixing plate, the first fixing plate and the second sealing gasket are connected to the diaphragm body through the fastening bolt, and two ends of the first connecting pipe and two ends of the second connecting pipe are respectively communicated with the feed inlet and the discharge outlet.

Preferably, the driving mechanism comprises a motor, a first rotating shaft is fixedly connected to the output end of the motor, a first belt wheel is fixedly connected to the outer wall of the first rotating shaft, a second rotating shaft is rotatably connected to the inner wall of the shell, a first crankshaft, a second belt wheel and a second crankshaft are arranged on the second rotating shaft, and the first belt wheel is connected with the second belt wheel through a belt.

Preferably, the pneumatic mechanism comprises a first piston cylinder and a second piston cylinder, wherein the first piston cylinder and the second piston cylinder are fixedly connected to the inner wall of the shell, a first through hole is formed in the first piston cylinder and is communicated with the first cylinder, a first piston plate is fixedly connected to the inner wall of the first piston cylinder, a first piston rod is rotatably connected to the outer wall of the first piston plate, and one end, far away from the first piston plate, of the first piston rod is rotatably connected to the first crankshaft.

Preferably, the second piston cylinder is provided with a second through hole, the second through hole is communicated with the second cylinder body, the inner wall of the second piston cylinder is slidably connected with a second piston plate, the outer wall of the second piston plate is rotationally connected with a second piston rod, and one end of the second piston rod, far away from the second piston plate, is rotationally connected to a second crankshaft.

Preferably, the ball pin is fixedly connected with the top end of the inner wall of the first groove, the second grooves are respectively formed in two sides of the inner wall of the first groove, the springs are fixedly connected with the right side of the inner wall of the second groove, the telescopic rods are fixedly connected with the other ends of the springs, the telescopic rods are slidably connected with the inner wall of the second groove, one ends, far away from the springs, of the telescopic rods are fixedly connected with rubber pads, and the rubber pads are tightly attached to the side surfaces of the diaphragm body.

Preferably, the buffer gear includes the fixed block, spherical recess has been seted up to the fixed block upper surface, spherical recess and ball round pin looks adaptation, third recess and fourth recess have been seted up to the fixed block bottom, third recess and fourth recess are run through by logical groove, the screw hole has been seted up to logical groove department, the screw hole is located fixed block side marginal position, fourth recess lateral wall rotation is connected with the bull stick, bull stick is kept away from fourth recess one end fixedly connected with handle, the fifth recess has been seted up to bull stick surface.

Compared with the prior art, the invention provides a diaphragm vacuum pump, which has the following beneficial effects:

this diaphragm vacuum pump, when the installation diaphragm, adopt square diaphragm, pass the logical groove of fixed block below with diaphragm one side and reach inside the fourth recess, insert the fifth recess of seting up on the bull stick with the diaphragm edge in the fourth recess, rotate the handle of bull stick one end, twine diaphragm one side on the bull stick, then screw threaded hole's screw, make logical groove can press from both sides the diaphragm of leading to the inslot, prevent that diaphragm and fixed block from breaking away from, install other trilateral other three fixed blocks with the diaphragm equally, can adjust the relaxation degree of diaphragm through rotatory bull stick, thereby realize controlling the power of diaphragm vacuum pump through the vibration amplitude of control diaphragm, through the ball hinge structure of fixed block and cylinder body, can slow down the damage of diaphragm side-to-side motion to the diaphragm, through having seted up the second recess at the cylinder body diapire, be equipped with the telescopic link in the second recess, the one end fixedly connected with rubber is kept away from to the telescopic link, through closely laminating rubber and diaphragm body, can keep apart the liquid on one side of diaphragm body and the piston cylinder of opposite side, prevent that liquid from entering into the piston cylinder through the first recess on the cylinder body in the cylinder body, influence the use of diaphragm vacuum pump.

Drawings

FIG. 1 is a schematic diagram of a diaphragm vacuum pump according to the present invention;

FIG. 2 is a schematic diagram of a pump diaphragm of a diaphragm vacuum pump according to the present invention;

FIG. 3 is a top view of a diaphragm vacuum pump according to the present invention;

FIG. 4 is a view showing the combination of a diaphragm body and a cylinder of a diaphragm vacuum pump according to the present invention;

fig. 5 is a schematic structural view of a diaphragm fixing block in a diaphragm vacuum pump according to the present invention;

fig. 6 is a combination view of a first groove and a fixing block on a cylinder body of a diaphragm vacuum pump according to the present invention.

In the figure: 1. a housing; 101. a feed inlet; 102. a discharge port; 2. a motor; 3. a first rotating shaft; 301. a first pulley; 4. a second rotating shaft; 401. a first crankshaft; 402. a second pulley; 403. a second crankshaft; 5. a first piston cylinder; 501. a first through hole; 6. a first piston plate; 601. a first piston rod; 7. a second piston cylinder; 701. a second through hole; 8. a second piston plate; 801. a second piston rod; 9. a first cylinder; 10. a second cylinder; 1001. a first groove; 1002. a second groove; 103. a spring; 104. a telescopic rod; 105. rubber; 11. a diaphragm body; 1101. a first fixing plate; 1102. a second fixing plate; 1103. a first gasket; 1104. a second gasket; 1105. a fastening bolt; 12. a first connection pipe; 1201. a first one-way valve; 1202. a second one-way valve; 13. a second connection pipe; 1301. a third one-way valve; 1302. a fourth one-way valve; 14. a slowing mechanism; 141. a fixed block; 142. a threaded hole; 143. a handle; 144. a rotating rod; 1441. a fifth groove; 145. a spherical groove; 146. a third groove; 147. a fourth groove; 148. and (5) through grooves.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.

In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Referring to fig. 1-6, a diaphragm vacuum pump comprises a housing 1, a feed inlet 101 and a discharge outlet 102 are arranged on the housing 1, a driving mechanism is arranged on the inner wall of the housing 1, a first cylinder body 9 and a second cylinder body 10 are fixedly connected to the inner wall of the housing 1, a diaphragm body 11 is arranged in the first cylinder body 9 and the second cylinder body 10, a first connecting pipe 12 is arranged on the first cylinder body 9, a second connecting pipe 13 is arranged on the second cylinder body 10, a first check valve 1201 and a second check valve 1202 are arranged on the first connecting pipe 12, a third check valve 1301 and a fourth check valve 1302 are arranged on the second connecting pipe 13, a first groove 1001 is formed in the joint of the first cylinder body 9 and the second cylinder body 10 with the diaphragm body 11, and a slowing mechanism 14 is arranged in the first groove 1001.

Through adopting above-mentioned technical scheme, liquid gets into in the pump through feed inlet 101, motor 2 drives actuating mechanism operation, actuating mechanism drives the inside piston of first cylinder body 9 and second cylinder body 10 and reciprocates, when the inside second piston plate 8 of second cylinder body 10 upwards moves, the air in the cylinder body gets into the piston cylinder through the second through-hole 701 of second piston cylinder 7 below, thereby make the inside diaphragm body 11 of second cylinder body 10 move to the right, thereby utilize the negative pressure to draw into the cylinder body from feed inlet 101 with the liquid inside, when the inside diaphragm body 11 of second cylinder body 10 moves to the left when second piston plate 8 moves down, extrude the inside liquid of second cylinder body 10 outside the pump from discharge gate 102.

Specifically, the diaphragm body 11 is provided with a fastening bolt 1105, the diaphragm body 11 is provided with a first fixing plate 1101 and a second fixing plate 1102, the first fixing plate 1101 and the second fixing plate 1102 are respectively arranged on two sides of the diaphragm body 11, the outer wall of the first fixing plate 1101 is fixedly connected with a second sealing pad 1104, the outer wall of the second fixing plate 1102 is fixedly connected with a first sealing pad 1103, the second fixing plate 1102, the first fixing plate 1101 and the second sealing pad 1104 are connected to the diaphragm body 11 through the fastening bolt 1105, and two ends of the first connecting pipe 12 and two ends of the second connecting pipe 13 are communicated with the feed inlet 101 and the discharge outlet 102.

Specifically, the driving mechanism comprises a motor 2, the output end of the motor 2 is fixedly connected with a first rotating shaft 3, the outer wall of the first rotating shaft 3 is fixedly connected with a first belt pulley 301, the inner wall of the shell 1 is rotatably connected with a second rotating shaft 4, a first crankshaft 401, a second belt pulley 402 and a second crankshaft 403 are arranged on the second rotating shaft 4, and the first belt pulley 301 is connected with the second belt pulley 402 through a belt.

Through adopting above-mentioned technical scheme, motor 2 output drives first pivot 3 rotation, first pivot 3 drives first band pulley 301 rotation, because first band pulley 301 and second band pulley 402 pass through the belt and connect, so the rotation of first band pulley 301 drives the rotation of second band pulley 402 to drive first bent axle 401 and second bent axle 403 rotation.

Specifically, the pneumatic mechanism includes first piston cylinder 5 and second piston cylinder 7, the equal fixed connection of first piston cylinder 5 and second piston cylinder 7 is at the inner wall of shell 1, be equipped with first through-hole 501 on the first piston cylinder 5, first through-hole 501 is linked together with first cylinder body 9, the first piston plate 6 of first piston cylinder 5 inner wall fixedly connected with, first piston plate 6 outer wall rotates and is connected with first piston rod 601, the one end that first piston rod 601 kept away from first piston plate 6 rotates and connects on first bent axle 401.

Through adopting above-mentioned technical scheme, through articulated first piston rod 601 on first bent axle 401, when motor 2 drove first bent axle 401 and rotated, first bent axle 401 drove the terminal first piston plate 6 of first piston rod 601 and do reciprocating motion in first piston cylinder 5 to make the gaseous entering or discharging of first piston cylinder 5 through first through-hole 501, thereby drive the motion of diaphragm body 11.

Specifically, the second piston cylinder 7 is provided with a second through hole 701, the second through hole 701 is communicated with the second cylinder body 10, the inner wall of the second piston cylinder 7 is slidably connected with a second piston plate 8, the outer wall of the second piston plate 8 is rotatably connected with a second piston rod 801, and one end of the second piston rod 801 far away from the second piston plate 8 is rotatably connected to the second crankshaft 403.

Through adopting above-mentioned technical scheme, through articulating second piston rod 801 on first bent axle 403, when motor 2 drove second bent axle 403 and rotated, second bent axle 403 drove the terminal second piston plate 8 of second piston rod 801 and do reciprocating motion in second piston cylinder 7 to make the gas in the second piston cylinder 7 get into or discharge through second through-hole 701, thereby drive the motion of diaphragm body 11.

Specifically, the ball pin 106 is fixedly connected with the top end of the inner wall of the first groove 1001, the second grooves 1002 are respectively formed in two sides of the inner wall of the first groove 1001, the springs 103 are fixedly connected with the right side of the inner wall of the second grooves 1002, the telescopic rods 104 are fixedly connected with the other ends of the springs 103, the telescopic rods 104 are slidably connected with the inner walls of the second grooves 1002, one ends, far away from the springs 103, of the telescopic rods 104 are fixedly connected with the rubber pads 105, and the rubber pads 105 are tightly attached to the side surfaces of the diaphragm body 11.

Through adopting above-mentioned technical scheme, with the second jar body 10 through ball round pin 106 and fixed block 141 articulated for the fixed block 141 can freely rock, through offer second recess 1002 and be equipped with rubber pad 105 in it in the second jar body 10, rubber pad 105 and diaphragm body 11 in close contact, can prevent that diaphragm body 11 left liquid from getting into inside first recess 1001, thereby get into inside the piston cylinder, influence the operation of diaphragm vacuum pump, through being equipped with spring 103 in second recess 1002 inside, can guarantee that rubber pad 105 can all the time with diaphragm body 11 in close contact when diaphragm body 11 moves.

Specifically, the buffer mechanism includes the fixed block 141, spherical recess 145 has been seted up to the fixed block 141 upper surface, spherical recess 145 and ball round pin 106 looks adaptation, third recess 146 and fourth recess 147 have been seted up to the fixed block 141 bottom, third recess 146 and fourth recess 147 are run through by logical groove 148, the screw hole 142 has been seted up to logical groove 148 department, screw hole 142 is located fixed block 141 side edge position, fourth recess 147 lateral wall rotates and is connected with bull stick 144, bull stick 144 is kept away from fourth recess 147 one end fixedly connected with handle 143, fifth recess 1441 has been seted up to bull stick 144 surface.

Through adopting above-mentioned technical scheme, when installing diaphragm 11, adopt square diaphragm, pass through the logical groove 148 below the fixed block 141 with diaphragm 11 on one side and reach inside the fourth recess 147, insert the fifth recess 1441 of seting up on the bull stick 144 with the diaphragm 11 edge in the fourth recess 147, rotate the handle 143 of bull stick 144 one end, twine on bull stick 144 with diaphragm 11 on one side, then screw down the screw of screw thread inslot 142 for the diaphragm 11 that leads to the groove 148 can press from both sides tight with the diaphragm 11 in the logical groove 148, prevent that diaphragm 11 from breaking away from with the fixed block 141, install other trilateral other three fixed blocks 141 of diaphragm 11 equally, can adjust the relaxation degree of diaphragm 11 through rotatory bull stick 144, thereby realize controlling diaphragm vacuum pump's power through the vibrations range of control diaphragm 11.

The application method and the working principle are as follows: in the invention, when in use, a user firstly starts the motor 2, the motor 2 drives the first belt pulley 301 on the first rotating shaft 3 to rotate, the first belt pulley 301 drives the second belt pulley 402 to rotate through a belt, the second belt pulley 402 drives the first crankshaft 401 and the second crankshaft 403 to rotate, the first crankshaft 401 and the second crankshaft 403 drive the first piston rod 601 and the second piston rod 801 to move up and down when rotating, the first piston plate 6 moves up in the first piston cylinder 5, the second piston plate 8 moves down in the second piston cylinder 7 when moving up in the first piston cylinder 5, the first piston plate 6 moves up to suck the gas in the first cylinder 9 into the first piston cylinder 5, meanwhile, the first one-way valve 1201 on the first connecting pipe 12 is opened, the second one-way valve 1202 closes the oil liquid to be sucked into the first cylinder 9 from the first connecting pipe 12, the air in the second piston cylinder 7 is extruded into the second cylinder 10 when the second piston plate 8 moves down, meanwhile, the third one-way valve 1301 on the second connecting pipe 13 is closed, the fourth one-way valve 1302 is opened, the diaphragm body 11 extrudes the oil in the second cylinder 10 into the discharge hole 102 to complete uninterrupted delivery, when the diaphragm 11 is installed, a square diaphragm is adopted, one side of the diaphragm 11 passes through the through groove 148 below the fixed block 141 to reach the inside of the fourth groove 147, the edge of the diaphragm 11 in the fourth groove 147 is inserted into the fifth groove 1441 formed on the rotating rod 144, the handle 143 at one end of the rotating rod 144 is rotated, one side of the diaphragm 11 is wound on the rotating rod 144, then the screw in the screw groove 142 is screwed, so that the through groove 148 can clamp the diaphragm 11 in the through groove 148 to prevent the diaphragm 11 from being separated from the fixed block 141, the other three sides of the diaphragm 11 are installed in the other three fixed blocks 141, the looseness degree of the diaphragm 11 can be adjusted by rotating the rotating rod 144, thereby realize controlling the power of diaphragm vacuum pump through the vibrations range of control diaphragm 11, through the ball hinge structure of fixed block 141 and cylinder body 10, can slow down the damage of diaphragm 11 side-to-side motion to diaphragm 11, through having seted up second recess 1002 at cylinder body 10 diapire, be equipped with telescopic link 104 in the second recess 1002, the one end fixedly connected with rubber 105 of second recess 1002 is kept away from to telescopic link 104, through closely laminating rubber 105 and diaphragm body 11, can keep apart the liquid of diaphragm body 11 one side and the piston cylinder of opposite side, prevent that liquid from entering into the piston cylinder through the first recess 1001 on the cylinder body 10, influence the use of diaphragm vacuum pump.

The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims

1. A diaphragm vacuum pump comprising a housing (1), characterized in that: the novel multifunctional automatic feeding device is characterized in that a feeding hole (101) and a discharging hole (102) are formed in the shell (1), a driving mechanism is arranged on the inner wall of the shell (1), a first cylinder body (9) and a second cylinder body (10) are fixedly connected to the inner wall of the shell (1), a diaphragm body (11) is arranged in each of the first cylinder body (9) and the second cylinder body (10), a first connecting pipe (12) is arranged on each of the first cylinder body (9), a second connecting pipe (13) is arranged on each of the second cylinder bodies (10), a first check valve (1201) and a second check valve (1202) are arranged on each of the first connecting pipes (12), a third check valve (1301) and a fourth check valve (1302) are arranged on each of the second connecting pipes (13), a first groove (1001) is formed in a joint of each of the first cylinder body (9) and each of the second cylinder bodies (10), and a slowing mechanism (14) is arranged in each of the first grooves (1001);

the novel high-pressure air separator is characterized in that a fastening bolt (1105) is arranged on the separator body (11), a first fixing plate (1101) and a second fixing plate (1102) are arranged on the separator body (11), the first fixing plate (1101) and the second fixing plate (1102) are respectively arranged on two sides of the separator body (11), a second sealing pad (1104) is fixedly connected to the outer wall of the first fixing plate (1101), a first sealing pad (1103) is fixedly connected to the outer wall of the second fixing plate (1102), the first sealing pad (1103), the second fixing plate (1102), the first fixing plate (1101) and the second sealing pad (1104) are connected to the separator body (11) through the fastening bolt (1105), and two ends of a first connecting pipe (12) and two ends of a second connecting pipe (13) are communicated with a feed inlet (101) and a discharge outlet (102);

the driving mechanism comprises a motor (2), a first rotating shaft (3) is fixedly connected to the output end of the motor (2), a first belt wheel (301) is fixedly connected to the outer wall of the first rotating shaft (3), a second rotating shaft (4) is rotatably connected to the inner wall of the shell (1), a first crankshaft (401), a second belt wheel (402) and a second crankshaft (403) are arranged on the second rotating shaft (4), and the first belt wheel (301) is connected with the second belt wheel (402) through a belt;

the novel diaphragm is characterized in that a ball pin (106) is fixedly connected to the top end of the inner wall of the first groove (1001), second grooves (1002) are respectively formed in two sides of the inner wall of the first groove (1001), a spring (103) is fixedly connected to the right side of the inner wall of the second groove (1002), a telescopic rod (104) is fixedly connected to the other end of the spring (103), the telescopic rod (104) is slidably connected with the inner wall of the second groove (1002), a rubber pad (105) is fixedly connected to one end, far away from the spring (103), of the telescopic rod (104), and the rubber pad (105) is tightly attached to the side face of the diaphragm body (11);

the buffer gear includes fixed block (141), spherical recess (145) have been seted up to fixed block (141) upper surface, spherical recess (145) and ball round pin (106) looks adaptation, third recess (146) and fourth recess (147) have been seted up to fixed block (141) bottom, third recess (146) and fourth recess (147) are run through by logical groove (148), threaded hole (142) have been seted up in logical groove (148) department, threaded hole (142) are located fixed block (141) side edge position, fourth recess (147) lateral wall rotation is connected with bull stick (144), bull stick (144) are kept away from fourth recess (147) one end fixedly connected with handle (143), fifth recess (1441) have been seted up on bull stick (144) surface.

2. A diaphragm vacuum pump according to claim 1, characterized in that: the pneumatic mechanism comprises a first piston cylinder (5) and a second piston cylinder (7), wherein the first piston cylinder (5) and the second piston cylinder (7) are fixedly connected to the inner wall of the shell (1), a first through hole (501) is formed in the first piston cylinder (5), the first through hole (501) is communicated with a first cylinder body (9), a first piston plate (6) is fixedly connected to the inner wall of the first piston cylinder (5), a first piston rod (601) is rotatably connected to the outer wall of the first piston plate (6), and one end, far away from the first piston plate (6), of the first piston rod (601) is rotatably connected to a first crankshaft (401).

3. A diaphragm vacuum pump according to claim 2, characterized in that: be equipped with second through-hole (701) on second piston cylinder (7), second through-hole (701) are linked together with second cylinder body (10), second piston cylinder (7) inner wall sliding connection has second piston plate (8), second piston plate (8) outer wall rotation is connected with second piston rod (801), the one end that second piston rod (801) kept away from second piston plate (8) rotates to be connected on second bent axle (403).