CN209280077U

CN209280077U - Closed bellows type accurate measurement pump installation

Info

Publication number: CN209280077U
Application number: CN201822050226.9U
Authority: CN
Inventors: 范维林
Original assignee: Tianjin Hope Industry and Trade Co Ltd
Current assignee: Tianjin Hope Industry and Trade Co Ltd
Priority date: 2018-12-07
Filing date: 2018-12-07
Publication date: 2019-08-20
Anticipated expiration: 2028-12-07

Abstract

The utility model provides a kind of closed bellows type accurate measurement pump installation, the device includes by pump case collet, tubular pump case and pump housing dome composition pump housing shell support transmission device and pipetting systems, the driving motor driving worm screw engagement turbine disc rotation of transmission device, the engagement threaded screw rod up and down motion of turbine disc internal screw thread pushes away contracting or the bag pump structural reform of stretching pipetting systems becomes its internal pressure, the non-return valve of recorder jar is closed when negative pressure, its internal liquid is drawn into bag pump body by the non-return valve opening of supplying bottle, the non-return valve of supplying bottle is closed when positive pressure, the intracorporal liquid of bag pump is injected into recorder jar by the non-return valve opening of recorder jar, since worm screw turbine system rotating ratio is very high, the revolving speed for controlling driving motor can be very fine change bag pump body in the variable quantity of pressure can meet the accuracy of metering liquid.The utility model has the beneficial effects that solve the technical problem of automatic and accurate metering liquid, provide it is a kind of can continuous accurate metering liquid dosing pump assembly.

Description

Closed bellows type accurate measurement pump installation

Technical field

The utility model relates to a kind of closed bellows type accurate measurement pump installations.

Background technique

Currently need to utilize one in a hurry in scientific research fields such as medical science, chemical-biological experiment, military medicine, sucking toxicitys Kind can continuous fine determine the metering pump of meter quantity of fluid, accurate measurement is carried out to the liquid in scientific experiment；In scientific experiment It is frequently necessary to take out a certain amount of solvent or solution from the container of sealing, the prior art mostly uses the tool of graduated cylinder one kind calm Liquid and measurement liquid are taken out in device.The sampling process is easy to happen reverse irrigation, pollutes to primary liquid, causes it not easy to store, Unnecessary economic loss is produced, sensitivity is low, and measurement error is big, and service life is short, and pilot process is dry vulnerable to outside contamination It disturbs, the low data inaccuracy of precision is unable to satisfy the demand of liquid accurate measurement, the requirement of contemporary scientific research is not achieved, thus The development of related science area research is constrained, therefore researches and develops the dosing pump assembly that one is capable of continuous accurate measurement and has become and work as It is preceding there is an urgent need to.

Summary of the invention

To solve the above problems, being adopted the purpose of the utility model is to provide a kind of closed bellows type accurate measurement pump installation With the method for control driving motor revolving speed, the variable quantity of the internal volume of the very delicate control bellows pump housing 37 and pressure is also The automatic and accurate metering of liquid is realized in the requirement that can satisfy the accuracy of metering pump metering liquid.

To achieve the above object, the technical solution of the utility model is to provide a kind of closed bellows type accurate measurement pump dress Set, which includes a discoid pump case collet, pump case collet upper surface connect tubular pump case, tubular pump case it is upper Outside the pump housing of end connection pump case dome, pump case collet, tubular pump case and pump case dome composition carrying transmission device and pipetting systems Shell, centre are pump inner cavities, and transmission device is to be installed between pump case collet upper surface and tubular pump case by taking turns solid bearing, empty Heart flange is covered admittedly by bearing and turbine screw fixes turbine disc, and the driving motor on the outside of pump case collet passes through a transmission Long axis is connected on the worm screw being engaged on turbine disc, and driving motor rotation drives turbine disc rotation, turbine disc rotation When its center internal screw thread can with threaded screw rod engage external screw thread interaction driving threaded screw rod move up and down drive push away Contracting or the bag pump structural reform for stretching pipetting systems become its volume and pressure, stretch the expansion of the bellows pump housing when threaded screw rod moves downward Volume generates negative pressure, and recorder jar one end non-return valve is closed, and non-return valve of the supplying bottle one end with infusion tube I is opened, will Liquid to be batched inside supplying bottle is drawn into bellows pump body by pipeline, pushes away contracting bag pump when threaded screw rod moves upwards When body reduces volume generation positive pressure, supplying bottle one end non-return valve is closed, and recorder jar one end has the single-direction balls of infusion tube II Valve is opened the metering liquid for being deposited on bellows pump body is lost by sedimentation, bending hose and other pipelines are injected into meter In measuring bottle, since worm screw turbine system rotating ratio is very high, when the revolving speed for carefully controlling driving motor can be very careful The variable quantity of the internal volume and pressure that reach the bellows pump housing can also meet the accuracy of metering pump metering liquid.

The beneficial effects of the utility model are: developing a kind of closed bellows type accurate measurement pump installation, pumped by changing Body volume and pressure control metering pump metering liquid accuracy, and can continuous accurate measurement, solve automatic and accurate meter The technical problem of quantity of fluid.

Detailed description of the invention

Attached drawing 1 is the schematic diagram of the utility model structure.

In figure:

1. cap tube screw 2., which pumps inner cavity 3., goes out the closed ball of 4. pump case dome of liquid hard tube, 5. pipetting hose, II 6. feed liquor valve port 7. 8. unidirectionally top 10. liquid valve mouth of spring, 11. valve ball nest, 12. infusion tube, II 13. non-return valve 14. sealing of cylindrical cavity 9. 15. recorder jar 16. of cushion rubber stretches, and 18. tubular pump case of metering liquid, 19. shaft, 20. pipetting systems 21. are driven electricity to bellows 17. 27. worm screw of machine 22. transmission long axis, 23. drive bearing, 24. motor cushion block, 25. heelpiece screw, 26. hollow flange, 28. threaded screw rod 29. take turns 31. pump case collet of solid 30. bottom of bearing cylinder screw, 32. bearing covers 33. turbine disc, 34. turbine screw, 35. transmission device admittedly 36. the 37. bellows pump housing of pump housing shell, 38. supplying bottle, 39. 40. pipetting hose of liquid to be batched, I 41. infusion tube, I 42. feed liquors are hard 43. fixing trim ring of pipe, 44. bending hose 45. settles flat 47. gasket seal, the 48. screw rod screw of 46. bellows of losing.

Specific embodiment

The utility model is illustrated in conjunction with attached drawing 1 and embodiment.

As shown in Fig. 1, the utility model provides a kind of closed bellows type accurate measurement pump installation, which includes one Discoid pump case collet 31 connects tubular pump case 18 in the upper surface of pump case collet 31, and the upper end of tubular pump case 18 connects pump Shell dome 4, pump housing shell 36 are the smooth hollow cavity structures of surfaces externally and internally that is made by corrosion-resistant rigid material, are by pumping Shell dome 4, tubular pump case 18 and a component of pump case collet more than 31 composition are used to carry transmission device 35 and pipetting systems 20 Main body, centre are pump inner cavities 2, are a discoid pump case collet 31 bottom, pass through respectively in 31 upper surface of pump case collet It takes turns solid bearing 29 and bottom cylinder screw 30 is equipped with transmission device 35 and tubular pump case 18, in the corresponding drive bearing 23 of pump case collet 31 Motor cushion block 24 and driving motor 21 are installed, motor cushion block 24 is fixedly mounted on pump case by heelpiece screw 25 on the outside of direction On collet 31, pump case dome 4 and imbibition are installed by cap tube screw 1 and 14 fixing seal of sealing rubber ring in 18 the top of tubular pump case The bellows pump housing 37 of system 20；Transmission device 35 is between 31 upper surface of pump case collet and tubular pump case 18 by taking turns solid bearing 29 installations, transmission device 35 is the mobile machine device being made by light solid rigid material, in tubular pump case 18 The wheel inlayed inside lower end is consolidated bearing 29 and is fixed by pump case collet 31, and a hollow flange 26 covers 32 and whirlpool by bearing admittedly Turbine disc 33 is fixed on solid 29 inside of bearing of wheel by wheel screw 34, can be rotated freely but can not be moved up and down, tubular pump case 18 middle and lower part is provided with a circular hole in 33 radial level position of turbine disc, and it is fixed that a drive bearing 23 is inlayed inside circular hole Rotatable transmission long axis 22,22 outer end of transmission long axis are connected to the biography being mounted on 31 outside motor cushion block 24 of pump case collet In the shaft 19 of dynamic motor 21, the inner end of transmission long axis 22 is connected on the worm screw 27 being engaged on 33 outer diameter of turbine disc, is passed The dynamic rotation of motor 21 drives transmission long axis 22 and worm screw 27 to rotate, and driving turbine disc 33 rotates, and the center of turbine disc 33 has The engagement of the external screw thread of internal screw thread and threaded screw rod 28,28 upper end of threaded screw rod pass through flat 46 circle of bellows of 37 bottom of the bellows pump housing The heart is non-rotatable by gasket seal 47 and the sealing fixation of screw rod screw 48；The bellows pump housing 37 is compatible by corrosion resistant rigid toughness Material be made an opening upwards with bellows gauffer surfaces externally and internally it is smooth it is easy to clean it is scalable change volume sealing Container, the opening of top are the fixing trim rings 43 that a circle extends outward, are fixed on pump case circle by sealing by sealing rubber ring 14 Motionless between lid 4 and tubular pump case 18, bottom is that open foraminate bellows not flat for the circular centre of plane of deformation for a rigidity Bottom 46, the aperture that centre is provided with can seal the screw thread for being secured across bellows flat 46 by gasket seal 47 and screw rod screw 48 Screw rod 28 keeps its non-rotatable, is with several scalable deformation for enclosing tortuous gauffer between fixing trim ring 43 and bellows flat 46 Flexible bellows 16, turbine disc 33 rotate when its center internal screw thread and threaded screw rod 28 engage external screw thread interact drive Dynamic threaded screw rod 28 moves up and down, and drives flat 46 upper and lower displacement of bellows therewith, compresses or pull open the scalable of flexible bellows 16 Gauffer reaches the volume and pressure for pushing away contracting or stretching the change bellows pump housing 37 of the bellows pump housing 37；Pipetting systems 20 are by being mounted on cylinder Feed liquor hard tube 42 on the bellows pump housing 37 and pump case dome 4 in shape pump case 18 and the out liquid of a component of liquid hard tube more than 3 composition Accurate metering system, Far Left have 38 internal storage of supplying bottle liquid 39 to be batched, have a pipetting hose I 40 straight It is inserted into 38 bottom of supplying bottle, the upper end of pipetting hose I 40 is sealed by a non-return valve 13 with infusion tube I 41 to be connected It is connected to one end of feed liquor hard tube 42, the other end of feed liquor hard tube 42, which is passed into, is fixed on pump case dome 4 by sealing rubber ring sealing The top inside the bellows pump housing 37 between tubular pump case 18, the bellows of 37 lower end of the bellows pump housing are equipped on flat 46 center of circle Cooperate the threaded screw rod 28 of transmission device 35, threaded screw rod 28 moves up and down under the driving of transmission device 35 pushes away contracting or stretching The bellows pump housing 37 changes volume and the pressure of the bellows pump housing 37 to complete to discharge and aspirate liquid 39 to be batched and measured liquid The process of body 17, the another side of pump case dome 4 have out liquid hard tube 3 be passed into 37 inner upper side of the bellows pump housing and bending hose 44 It is connected, bending hose 44 aspirates metering liquid 17 by settling the bottom that 45 touch the bellows pump housing 37 of losing, and reaches pump There are another non-return valve 13 of the connection of pipetting hose II 5, the infusion of non-return valve 13 in 3 top of liquid hard tube that goes out of 4 outer end of shell dome Hose II 12 is inserted into recorder jar 15, and metering liquid 17 is injected into recorder jar 15 by infusion tube II 12；It is single It is to be made surfaces externally and internally smooth one easy to clean to have unidirectionally through liquid function by corrosion-resistant sturdy material to ball valve 13 Can automatic valve, a closed cylindrical cavity 8 with valve ball nest 11, on the right of be provided with a small diameter circular hole on side wall Liquid valve mouth 10 connection outside infusion tube II 12, there is horn-like valve ball nest 11 on the left side, is provided at the top of valve ball nest 11 The pipetting hose II 5 of the connection of feed liquor valve port 6 outside of one small diameter circular hole, the horn mouth interior lights at 11 top of valve ball nest The sliding closed ball 7 of spherical shape with a surface coating silica gel is fitted close, and the unidirectional top spring 9 of a spiral round is pressed on closed Between 8 the right bottom surface of ball 7 and cylindrical cavity, closed ball 7 is held out against played in the horn mouth of valve ball nest 11 it is closed without leakage Effect, when having that metering liquid 17 is conveyed from left direction right direction, external pressure drives fluid pressure to overcome unidirectional top spring 9 Pressure push open the closed ball 7 in valve ball nest 11 allow metering liquid 17 flow and from feed liquor valve port 6 be transported to liquid valve mouth 10, instead Exist when the external pressure or while having reverse pressure that do not convey from left direction right direction unidirectionally push up spring 9 and compress closed ball 7 It is closed without leakage to play the role of one direction circulation in valve ball nest 11；The expansion of the bellows pump housing 37 is stretched when threaded screw rod 28 moves downward Large volume generates negative pressure, and 15 one end non-return valve 13 of recorder jar is closed, and 38 one end of supplying bottle is unidirectional with infusion tube I's 41 Ball valve 13 is opened, and the liquid to be batched 39 inside supplying bottle 38 is drawn into inside the bellows pump housing 37 by pipeline, when screw thread silk Bar 28 move upwards push away the contracting bellows pump housing 37 reduce volume generate positive pressure when, 38 one end non-return valve 13 of supplying bottle close, metering Non-return valve 13 of 15 one end of bottle with infusion tube II 12 is opened, and the metering liquid inside the bellows pump housing 37 will be deposited on 17 lose 45, bending hose 44 by sedimentation and other pipelines are injected into recorder jar 15, due to worm screw turbine system rotating ratio It is very high, when the revolving speed for carefully controlling driving motor 21 can be very careful control the bellows pump housing 37 internal volume and pressure The variable quantity of power also just can satisfy the accuracy of metering pump metering liquid.

Embodiment:

When using a kind of closed bellows type accurate measurement pump installation, it gets out liquid 39 to be batched first, is poured into confession In liquid bottle 38, re-inspection recorder jar 15 must be it is empty, open the power supply of whole device and reset, as needed adjust transmission electricity Then the revolving speed of machine 21 is started to work, driving motor 21 is rotated according to the revolving speed of setting, and transmission long axis 22 and worm screw 27 is driven to revolve Turn, driving turbine disc 33 starts to rotate, and the internal screw thread and threaded screw rod 28 at its center engage outer when turbine disc 33 rotates Screw thread interaction driving threaded screw rod 28 moves downward, and drives bellows flat 46 also to bottom offset therewith, pulls open flexible bellows 16 scalable gauffer, which reaches, stretches the volume generation negative pressure that the bellows pump housing 37 expands the bellows pump housing 37, and 15 one end of recorder jar is unidirectional Ball valve 13 is closed, and the unidirectional top spring 9 of spiral round is pressed between 8 the right bottom surface of closed ball 7 and cylindrical cavity, by closed ball 7 Hold out against play the role of in the horn mouth of valve ball nest 11 it is closed without leakage；Due to being negative pressure in the pump inner cavity 2 of the bellows pump housing 37, Non-return valve 13 of 38 one end of supplying bottle with infusion tube I 41 is opened, and the liquid pressure of liquid 39 to be batched is driven to be made every effort to overcome in this way The pressure of the unidirectional top spring 9 of clothes pushes the closed ball 7 in valve ball nest 11 open, and the liquid to be batched 39 inside supplying bottle 38 is passed through pipeline It is drawn into inside the bellows pump housing 37；When the external screw thread phase that turbine disc 33 rotates the internal screw thread at its center and threaded screw rod 28 engages When interaction driving threaded screw rod 28 moves upwards, consequently also bellows flat 46 is driven also to push up contracting, pushes away the flexible bellows 16 of contracting Scalable gauffer reduce the bellows pump housing 37 volume generate positive pressure, 38 one end non-return valve 13 of supplying bottle close, spiral round Unidirectional top spring 9 be pressed between closed ball 7 and the bottom surface of cylindrical cavity 8, closed ball 7 is held out against into the horn mouth in valve ball nest 11 Inside play the role of closed without leakage；Non-return valve 13 of 15 one end of recorder jar with infusion tube II 12 is opened, bending hose 44 are lost 45 bottom suction metering liquid 17 for touching the bellows pump housing 37 by sedimentation, metering liquid 17 from left direction to The closed ball 7 that external pressure drives fluid pressure that the pressure of unidirectional top spring 9 is overcome to push open in valve ball nest 11 when right direction conveys allows The flowing of metering liquid 17 is transported to liquid valve mouth 10 from feed liquor valve port 6, is inserted into the defeated of the non-return valve 13 in recorder jar 15 Metering liquid 17 is injected into recorder jar 15 by liquid hose II 12, will thus be deposited on the meter inside the bellows pump housing 37 Quantity of fluid 17 loses 45, bending hose 44 by sedimentation and other pipelines are injected into recorder jar 15, due to worm screw turbine system Rotating ratio is very high, when the revolving speed for carefully controlling driving motor 21 can be very careful control the bellows pump housing 37 inner bulk Long-pending and pressure variable quantity also just can satisfy the accuracy of metering pump metering liquid；Repeat above procedure, so that it may treat meter Quantity of fluid carries out continuous accurate measurement, after being fully completed, closes closed bellows type accurate measurement pump installation, will measure completion Liquid pours out the scientific experiment research for next step from recorder jar 15.

Claims

1. a kind of closed bellows type accurate measurement pump installation, it is characterized in that: the device includes a discoid pump case collet (31), tubular pump case (18) are connected in the upper surface of pump case collet (31), the upper end of tubular pump case (18) connects pump case dome (4), pump case collet (31), tubular pump case (18) and pump case dome (4) composition carrying transmission device (35) and pipetting systems (20) Pump housing shell (36), centre be pump inner cavity (2), transmission device (35) is in pump case collet (31) upper surface and tubular pump case (18) by taking turns solid bearing (29) installation between, hollow flange (26) covers (32) and turbine screw (34) for whirlpool by bearing admittedly It takes turns disk (33) to fix, the driving motor (21) on the outside of pump case collet (31) is connected to by a transmission long axis (22) and is engaged on On worm screw (27) on turbine disc (33), driving motor (21) rotation drives turbine disc (33) rotation, turbine disc (33) In external screw thread interaction driving threaded screw rod (28) that the internal screw thread at its center can be engaged with threaded screw rod (28) when rotation Lower movement drives the bellows pump housing (37) for pushing away contracting or stretching pipetting systems to change its volume and pressure, when threaded screw rod (28) is downward Movement stretches the bellows pump housing (37) extended volume and generates negative pressure, and recorder jar (15) one end non-return valve (13) is closed, supplying bottle (38) non-return valve (13) of the one end with infusion tube I(41) is opened, by the internal liquid to be batched (39) of supplying bottle (38) It is drawn into the bellows pump housing (37) inside by pipeline, pushes away the contracting bellows pump housing (37) reduction volume when threaded screw rod (28) moves upwards When generating positive pressure, supplying bottle (38) one end non-return valve (13) is closed, and recorder jar (15) one end has infusion tube II(12) Non-return valve (13), which is opened, will be deposited on the internal metering liquid (17) of the bellows pump housing (37) by settling lose (45), bending Hose (44) and other pipelines are injected into recorder jar (15), since worm screw turbine system rotating ratio is very high, are controlled when carefully The variable quantity of the internal volume for reaching the bellows pump housing (37) and pressure that the revolving speed of driving motor can be very careful also can To meet the accuracy of metering pump metering liquid.

2. a kind of closed bellows type accurate measurement pump installation according to claim 1, it is characterized in that: the pump housing shell (36) it is the smooth hollow cavity structure of surfaces externally and internally that is made by corrosion-resistant rigid material, is by pump case dome (4), tubular The main body for being used to carry transmission device (35) and pipetting systems (20) of pump case (18) and the multiple component compositions of pump case collet (31), It is a discoid pump case collet (31) bottom, passes through wheel solid bearing (29) and bottom respectively in pump case collet (31) upper surface Cylinder screw (30) is equipped with transmission device (35) and tubular pump case (18), in pump case collet (31) corresponding drive bearing (23) direction Outside motor cushion block (24) and driving motor (21) be installed, motor cushion block (24) is fixedly mounted on by heelpiece screw (25) On pump case collet (31), tubular pump case (18) topmost passes through cap tube screw (1) and sealing rubber ring (14) fixing seal installation pump The bellows pump housing (37) of shell dome (4) and pipetting systems (20).

3. a kind of closed bellows type accurate measurement pump installation according to claim 1, it is characterized in that: the pipetting systems It (20) is by the feed liquor hard tube (42) on the bellows pump housing (37) and pump case dome (4) that are mounted in tubular pump case (18) and liquid out The liquid accurate metering system of hard tube (3) multiple components composition, Far Left have supplying bottle (38) internal storage it is to be batched Liquid (39) has a pipetting hose I(40) straight cutting to the upper end of supplying bottle (38) bottom, pipetting hose I(40) pass through one Non-return valve (13) with infusion tube I(41) is sealably coupled to one end of feed liquor hard tube (42), feed liquor hard tube (42) it is another One end is passed into the bellows pump housing (37) being fixed between pump case dome (4) and tubular pump case (18) by sealing rubber ring sealing The top in portion is equipped with the threaded screw rod of cooperation transmission device (35) on flat (46) center of circle of the bellows of the bellows pump housing (37) lower end (28), threaded screw rod (28) moves up and down under the driving of transmission device (35) pushes away contracting or stretches the bellows pump housing (37) to change The volume and pressure of the bellows pump housing (37) to complete to discharge and aspirate liquid to be batched (39) and the process of metering liquid (17), The another side of pump case dome (4) have out liquid hard tube (3) be passed into the bellows pump housing (37) inner upper side and bending hose (44) phase Even, bending hose (44) by sedimentation lose (45) touch bottom suction metering liquid (17) of the bellows pump housing (37), stretch There is pipetting hose II(5 in liquid hard tube (3) top that goes out for arriving pump case dome (4) outer end out) another non-return valve (13) is connected, it is single It is inserted into recorder jar (15) to the infusion tube II(12 of ball valve (13)), by infusion tube II(12) by metering liquid (17) it is injected into recorder jar (15).

4. a kind of closed bellows type accurate measurement pump installation according to claim 1, it is characterized in that: the transmission device (35) it is the mobile machine device being made by light solid rigid material, is inlayed inside the lower end of tubular pump case (18) It takes turns solid bearing (29) to be fixed by pump case collet (31), a hollow flange (26) covers (32) and turbine screw by bearing admittedly (34) turbine disc (33) is fixed on the inside of wheel solid bearing (29), can rotates freely but can not moves up and down, tubular pump case (18) middle and lower part is provided with a circular hole in turbine disc (33) radial level position, and a drive bearing is inlayed inside circular hole (23) fixed rotatable transmission long axis (22), transmission long axis (22) outer end, which is connected to, is mounted on electricity on the outside of pump case collet (31) In the shaft (19) of driving motor (21) on machine cushion block (24), the inner end of transmission long axis (22), which is connected to, is engaged on turbine disc (33) on the worm screw on outer diameter (27), driving motor (21) rotation drives transmission long axis (22) and worm screw (27) rotation, drives whirlpool Disk (33) rotation is taken turns, there are the engagement of the external screw thread of internal screw thread and threaded screw rod (28), threaded screw rod in the center of turbine disc (33) (28) upper end is close by gasket seal (47) and screw rod screw (48) across flat (46) center of circle of bellows of the bellows pump housing (37) bottom Sealing is fixed non-rotatable, and the external screw thread of internal screw thread and threaded screw rod (28) engagement at its center is mutual when turbine disc (33) rotates Effect driving threaded screw rod (28) moves up and down.

5. a kind of closed bellows type accurate measurement pump installation according to claim 1, it is characterized in that: the bellows pump housing It (37) is surfaces externally and internally light of the opening upwards with bellows gauffer that is made by corrosion resistant rigid toughness compatible material The sliding scalable sealing container for changing volume easy to clean, the opening of top is the fixing trim ring (43) that a circle extends outward, is led to It crosses sealing rubber ring (14) and is fixed on by sealing motionless between pump case dome (4) and tubular pump case (18), bottom is a rigidity The circular centre of plane of deformation does not open that foraminate bellows are flat (46), and the aperture that centre is provided with can be by gasket seal (47) The threaded screw rod (28) for being secured across bellows flat (46) with screw rod screw (48) sealing keeps its non-rotatable, fixing trim ring (43) It is the flexible bellows (16) with several scalable deformation for enclosing tortuous gauffer between bellows flat (46), in threaded screw rod (28) bellows flat (46) upper and lower displacement is driven when moving up and down, the scalable gauffer for compressing or pulling open flexible bellows (16) reaches It pushes away contracting or stretches volume and pressure that the bellows pump housing (37) change the bellows pump housing (37).

6. a kind of closed bellows type accurate measurement pump installation according to claim 1, it is characterized in that: the non-return valve It (13) is to be made surfaces externally and internally smooth one easy to clean to have unidirectionally through liquid functional by corrosion-resistant sturdy material Automatic valve is provided with a small diameter circular hole on its right side wall of one closed cylindrical cavity (8) with valve ball nest (11) Liquid valve mouth (10) connection outside infusion tube II(12), there are horn-like valve ball nest (11), valve ball nest (11) in the left side Top is provided with the pipetting hose II(5 of feed liquor valve port (6) the connection outside of a small diameter circular hole), at the top of valve ball nest (11) Horn mouth interior smooth and the closed ball of spherical shape (7) of surface coating silica gel are fitted close, spiral round it is unidirectional Top spring (9) is pressed on the right of closed ball (7) and cylindrical cavity (8) between bottom surface, and closed ball (7) is held out against in valve ball nest (11) Play the role of in horn mouth it is closed without leakage, when have metering liquid (17) from left direction right direction convey when external pressure It drives fluid pressure that the pressure of unidirectional top spring (9) is overcome to push the closed ball (7) in valve ball nest (11) open and allows metering liquid (17) Flowing is transported to liquid valve mouth (10) from feed liquor valve port (6), otherwise when the external pressure not conveyed from left direction right direction Or has unidirectionally to push up spring (9) when reverse pressure and compress closed ball (7) and play that one direction circulation is closed not to leak in valve ball nest (11) The effect of liquid.