CN111120278A

CN111120278A - Precise diaphragm pump

Info

Publication number: CN111120278A
Application number: CN202010045263.XA
Authority: CN
Inventors: 屠文闻; 阮佳吉; 鲁波
Original assignee: Ningbo Sibairui Automatic Control Equipment Co ltd
Current assignee: Ningbo Sibairui Automatic Control Equipment Co ltd
Priority date: 2020-01-16
Filing date: 2020-01-16
Publication date: 2020-05-08

Abstract

The invention mainly discloses a precision diaphragm pump, which adopts the technical scheme that: including the PLC controller, the frame, drive assembly, go up the push-and-pull magnetic ring, push down and draw the magnetic ring down, seal assembly and lower liquid way and last liquid way, the push-and-pull magnetic ring is gone up in the PLC controller control respectively, push down and draw magnetic ring and drive assembly down, through controlling push-and-pull magnetic ring or push down and draw the magnetic ring and gain or lose the electricity respectively, thereby make drive assembly and seal assembly clearance fit, be used for controlling liquid input or output, the outflow speed of liquid is controlled through the rotational speed that changes step motor, it can accomplish that liquid inflow size can be regulated and control, thereby reach the precision and see the controllability, also can easily realize changing the positive and negative flow direction of liquid.

Description

Precise diaphragm pump

Technical Field

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

Background

At present, a pump for conveying strong acid and strong base liquid is the most common electromagnetic diaphragm pump, the electromagnetic diaphragm pump is a kind of metering pump, the metering pump is a special displacement pump capable of metering conveyed fluid, the difference between the electromagnetic diaphragm metering pump and other metering pumps is mainly a driving part, the diaphragm metering pump pumps the liquid out of a medicament box by the movement of a diaphragm into an injection system, and a liquid conveying tool is used.

However, the electromagnetic diaphragm metering pump on the market at present can only convey liquid in one direction, and can not realize reverse pumping of the liquid, so that the strong corrosive liquid can remain in the pump for a long time, the structure of the pump body is damaged, and the service life of the pump body is influenced; in addition, such pumps are also inaccurate in controlling small liquid flows.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the precise diaphragm pump which can effectively, stably and precisely convey strong acid and strong alkali liquid, can regulate and control the liquid inlet quantity, and can easily change the forward and reverse flow directions of the liquid.

In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a precision diaphragm pump, includes PLC controller, frame, drive assembly, goes up push-and-pull magnetic ring, pushes down and draws magnetic ring, seal assembly and lower liquid way and last liquid way, and the PLC controller controls respectively and goes up push-and-pull magnetic ring, pushes down and draws magnetic ring and drive assembly, and through controlling last push-and-pull magnetic ring or push-and-pull magnetic ring respectively get electric or lose electricity, thereby make drive assembly and seal assembly clearance fit for control liquid input or output.

Preferably: the driving assembly comprises a stepping motor, a screw shaft bearing and a ball screw, the ball screw is connected with the inside of the screw shaft bearing, and the stepping motor drives the screw shaft bearing to rotate forwards or backwards so as to drive the ball screw to move leftwards or rightwards.

Preferably: the sealing assembly comprises a pair of small sealing diaphragms, a pair of spring assemblies, a middle large sealing diaphragm, a pushing block and a diaphragm plate, wherein the small sealing diaphragms are distributed up and down, one side of each spring assembly is connected with the corresponding upper push-pull magnetic ring and the corresponding lower push-pull magnetic ring, the other side of each spring assembly is connected with the corresponding small sealing diaphragms distributed up and down, one end of a ball screw is connected with the pushing block, the large sealing diaphragm is arranged on the pushing block, the large sealing diaphragm, the small sealing diaphragms and the diaphragm plate form a cavity, the cavity is connected with the lower liquid channel and the upper liquid channel in a matched mode, and the large sealing diaphragm and the small sealing diaphragm can be respectively in close contact with the diaphragm plate to form a sealing state. When the stepping motor operates in forward rotation or reverse rotation, the screw rod bearing can be driven to rotate forward or reverse, the ball screw is driven to move leftwards or rightwards, the large sealing diaphragm is driven to perform the same displacement action, the upper push-pull magnetic ring and the lower push-pull magnetic ring are in a power-off state or a power-on state, the small sealing diaphragm and the diaphragm are in close contact or form a gap, and liquid is controlled to enter and exit.

Preferably: the ball screw is provided with a connecting plate, a limit screw is fixedly arranged on the connecting plate, a travel switch corresponding to the limit screw is arranged on the base, and the limit screw moves rightwards to be in contact with the travel switch. When moving rightwards, the ball screw drives the limit screw on the connecting plate to move rightwards, and after the limit screw moves rightwards and contacts the travel switch, the limit screw feeds back to the PLC controller, so that the stepping motor is controlled to rotate reversely, and the stop is realized after the limit screw rotates reversely to a fixed number of turns.

Preferably: the spring component comprises an elastic seat, a first connecting piece of a spring part and a second connecting piece, the spring part is movably connected in the elastic seat, one end of the first connecting piece is connected with the upper push-pull magnetic ring, the other end of the first connecting piece is hinged with one end of the second connecting piece, the other end of the second connecting piece is hinged on the elastic seat, one side of the spring part is connected with the second connecting piece, and the other side of the spring part is connected with the small sealing diaphragm. The spring assembly is connected with the upper push-pull magnetic ring or the lower push-pull magnetic ring in the same structure, when the upper push-pull magnetic ring is electrified, the first connecting sheet and the second connecting sheet are driven to move, so that the spring part is driven to pull towards the left, the small sealing membrane at the upper part also moves towards the left, and the upper channel is opened; the upper push-pull magnetic coil loses power, the small sealing diaphragm on the upper part is ejected out under the thrust action of the spring part and can be in close contact with the diaphragm to form a sealing state.

Preferably: the sealing component, the liquid guide joint and the sealing conical head are all made of polytetrafluoroethylene materials. Has the characteristics of acid resistance, alkali resistance and various organic solvents resistance.

Preferably: the top of the large sealing diaphragm is an arc-shaped surface, one side of the middle of the diaphragm is matched with the shape of the arc-shaped surface, the contact area is increased, and the sealing effect is improved.

Preferably: the lower liquid channel and the upper liquid channel are respectively composed of a liquid guide joint, a sealing conical head and a guide pipe, and the guide pipe is respectively in sealing fit with the liquid guide joint and the sealing conical head, so that the sealing effect is good.

Preferably: and a pressing plate is arranged between the liquid guide joint and the diaphragm plate, and the liquid guide joint is fixedly connected with the pressing plate through a bolt and is firmly installed.

The invention has the following beneficial effects:

effective stable and accurate strong acid alkali liquid of transport, the outflow speed of controlling liquid through the rotational speed that changes step motor can accomplish that liquid inflow size can be regulated and control to reach accurate controllability, control step motor direction of rotation and go up the cooperation action of push-and-pull magnetic ring or push-and-pull magnetic ring down, the realization that just can relax changes the positive and negative flow direction of liquid.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

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

FIG. 3 is a schematic view of a diaphragm pump according to the present invention in a resting state;

FIG. 4 is a schematic view showing the state of liquid input in the diaphragm pump according to the present invention;

FIG. 5 is a schematic view showing the state of liquid output in the diaphragm pump according to the present invention;

FIG. 6 is a schematic view illustrating the distance calibration between a limit screw and a travel switch according to the present invention;

fig. 7 is a schematic diagram of the operation of the limit screw contacting the travel switch of the present invention.

Reference numerals: 1. a machine base; 2. a drive assembly; 21. a stepping motor; 22. a screw bearing; 23. a ball screw; 3. push-pull magnetic ring upwards; 4. pushing and pulling the magnetic ring; 5. a seal assembly; 51. a small sealing membrane; 52. a spring assembly; 53. a large sealing membrane; 54. a pushing block; 55. a diaphragm plate; 56. a chamber; 6. a liquid discharging channel; 7. a liquid feeding channel; 8. a connecting plate; 9. a limit screw; 10. a travel switch; 11. an elastic seat; 12. a spring member; 13. a first connecting piece; 14. a second connecting sheet; 15. a drainage connector; 16. sealing the conical head; 17. a conduit; 18. a joint cover; 19. and (7) pressing a plate.

Detailed Description

The preferred embodiments of the present invention will be described in further detail with reference to the accompanying drawings.

The precise diaphragm pump shown in fig. 1-7 comprises a PLC controller, a base 1, a driving assembly 2, an upper push-pull magnetic coil 3, a lower push-pull magnetic coil 4, a sealing assembly 5, a lower liquid channel 6 and an upper liquid channel 7, wherein the PLC controller controls the upper push-pull magnetic coil 3, the lower push-pull magnetic coil 4 and the driving assembly 2 respectively, and controls the upper push-pull magnetic coil 3 or the lower push-pull magnetic coil 4 to be powered on or powered off respectively, so that the driving assembly 2 is movably matched with the sealing assembly 5 and used for controlling liquid input or output. The PLC controller controls each component in the prior art, the invention is not described in detail, the lower liquid channel 6 and the upper liquid channel 7 are respectively composed of a liquid guide joint 15, a sealing conical head 16 and a guide pipe 17, the guide pipe 17 is respectively matched with the liquid guide joint 15 and the sealing conical head 16 in a sealing mode, the sealing effect is good, and a joint cover 18 can be arranged on the outer side of the liquid guide joint 15.

The driving assembly 2 comprises a stepping motor 21, a screw shaft bearing 22 and a ball screw 23, the ball screw 23 is connected with the inside of the screw shaft bearing 22, the stepping motor 21 drives the screw shaft bearing 22 to rotate forwards or reversely so as to drive the ball screw 23 to move leftwards or rightwards, a connecting plate 8 is arranged on the ball screw 23, a limit screw 9 is fixedly arranged on the connecting plate 8, a travel switch 10 corresponding to the limit screw 9 is arranged on the machine base 1, the limit screw 9 moves rightwards to be in contact with the travel switch 10, the travel switch is the prior art, and detailed principle description is not needed.

When the stepping motor 21 operates in forward rotation or reverse rotation, the screw rod bearing 22 can be driven to rotate forward or reverse to drive the ball screw 23 to move leftwards or rightwards, so that the large sealing diaphragm 53 is driven to perform the same displacement action, the upper push-pull magnetic ring 3 and the lower push-pull magnetic ring 4 are in a power-off or power-on state, the small sealing diaphragm 51 is in close contact with the diaphragm 55 or a gap is formed, and the liquid inlet and outlet are controlled.

The sealing assembly 5 comprises a pair of small sealing diaphragms 51 distributed up and down, a pair of spring assemblies 52, a middle large sealing diaphragm 53, a pushing block 54 and a diaphragm 55, one sides of the pair of spring assemblies 52 are respectively connected with the corresponding upper push-pull magnetic ring 3 and the lower push-pull magnetic ring 4, the connection structures are the same, each spring assembly 52 comprises an elastic seat 11, a first connecting piece 13 and a second connecting piece 14 of a spring part 12, the spring part 12 is movably connected in the elastic seat 11, one end of the first connecting piece 13 is connected with the upper push-pull magnetic ring 3, the other end of the first connecting piece 13 is hinged with one end of the second connecting piece 14, the other end of the second connecting piece 14 is hinged on the elastic seat 11, one side of the spring part 12 is connected with the second connecting piece 14, and the other side of the spring part. One end of the ball screw 23 is connected with the pushing block 54, the large sealing diaphragm 53 is installed on the pushing block 54, the large sealing diaphragm 53, the small sealing diaphragm 51 and the diaphragm 55 form a cavity 56, the cavity 56 is respectively connected with the lower fluid passage 6 and the upper fluid passage 7 in a matching manner, and the large sealing diaphragm 53 and the small sealing diaphragm 51 can respectively contact with the diaphragm 55 tightly to form a sealing state. When the upper push-pull magnetic ring 3 is electrified, the first connecting sheet 13 and the second connecting sheet 14 are driven to move, so that the spring piece 12 is driven to be pulled to the left, the upper small sealing membrane 51 also moves to the left, and an upper channel is opened; the upper push-pull magnetic ring 3 loses power, the upper small sealing diaphragm 51 is ejected out under the thrust action of the spring part 12 and can be in close contact with the diaphragm 55 to form a sealing state.

The sealing component 5, the liquid guide joint 15 and the sealing conical head 16 are all made of polytetrafluoroethylene materials and have the characteristics of acid resistance, alkali resistance and various organic solvents resistance. The top of the large sealing diaphragm 53 is an arc-shaped surface, one side of the middle of the diaphragm 55 is matched with the shape of the arc-shaped surface, the contact area is increased, and the sealing effect is improved. And a pressing plate 19 is arranged between the liquid guide joint 15 and the diaphragm plate 55, and the liquid guide joint 15 is fixedly connected with the pressing plate 19 through bolts and is firmly installed.

The working principle is as follows: when the diaphragm pump is just started, the distance between the large sealing diaphragm 53 is calibrated once, and the adjustment mode is as follows: the stepping motor 21 rotates forward to drive the screw bearing 22, so that the ball screw 23 moves to the right, the connecting plate 8 fixed on the ball screw 23 moves to the right, the limit screw 9 is fixed on the connecting plate 8, after the limit screw 9 moves to the right and contacts the travel switch 10, the stepping motor 21 rotates reversely, the ball screw 23 moves to the left, and the stop is performed after the number of the fixed rings. The calibration is performed in such a way that the diaphragm pump can be reset to a specific position after being stopped at any time and before the next operation is started, the position is the origin position, and the next operation can be performed only when the stepping motor 21 is operated to the origin position.

The static state is a state waiting for operation after the distance calibration of the diaphragm pump is completed, at the moment, the upper push-pull magnetic coil 3 and the lower push-pull magnetic coil 4 are in a power-off loosening state, and the small sealing diaphragms 51 distributed up and down are ejected by the spring part 12 and are tightly attached to the diaphragm plate 55 to form a sealing state.

Referring to fig. 4, the liquid input state: the lower push-pull magnetic ring 4 is electrified to drive the first connecting sheet 13 and the second connecting sheet 14 to move, so that the spring piece 12 is driven to be pulled to the left, the lower small sealing membrane 51 is also driven to move to the left under the action of the pulling force, and a lower channel is opened; at the moment, the stepping motor 21 rotates reversely, the ball screw 23 moves leftwards, and the large sealing diaphragm 53 is driven to move leftwards, so that a vacuum suction force is formed by the large sealing diaphragm 53 and the chamber 56 of the diaphragm 55, and the liquid in the lower liquid channel 6 at the lower part is pumped into the chamber 56; after the stepping motor 21 runs in place, the motor stops, the lower push-pull magnetic ring 4 loses power, the small sealing diaphragm 51 at the lower part is ejected rightwards under the action of the pushing force of the spring part 12, and the small sealing diaphragm 51 is in close contact with the diaphragm 55 again to form a sealing state.

Referring to fig. 5, the liquid delivery state: the upper push-pull magnetic ring 3 is electrified to drive the first connecting sheet 13 and the second connecting sheet 14 to move, so that the spring piece 12 is driven to be pulled to the left, the upper small sealing membrane 51 also moves to the left, and an upper channel is opened; at the moment, the stepping motor 21 rotates forwards to drive the large sealing diaphragm 53 to move rightwards, so that liquid between the large sealing diaphragm 53 and the diaphragm 55 is squeezed out, and the liquid flows out through the upper liquid channel 7; in this state, the outflow rate of the liquid can be controlled by changing the rotation speed of the stepping motor 21, the rotation speed of the stepping motor 21 is controlled by a driver, and the driver is controlled by a PLC controller, thereby achieving precise controllability. After the stepping motor 21 runs in place, the motor stops, the upper push-pull magnetic ring 3 loses power, the upper small sealing diaphragm 51 is ejected out under the action of the thrust of the spring part 12, and the diaphragm 55 forms a sealing state.

The completion action is a single positive pumping action of the diaphragm pump, and one positive pumping action cycle is recorded; the opposite operation is the reverse pumping operation. When the diaphragm pump is operated, the number of operation turns of the stepping motor 21 is a fixed number of turns, so that it can be ensured that the input and output liquid flow rates of each operation period are also fixed values.

The above-mentioned embodiments are only used for explaining the inventive concept of the present invention, and do not limit the protection of the claims of the present invention, and any insubstantial modifications of the present invention using this concept shall fall within the protection scope of the present invention.

Claims

1. A precision diaphragm pump characterized by: the liquid level controller comprises a PLC controller, a base, a driving assembly, an upper push-pull magnetic ring, a lower push-pull magnetic ring, a sealing assembly, a lower liquid channel and an upper liquid channel, wherein the PLC controller respectively controls the upper push-pull magnetic ring, the lower push-pull magnetic ring and the driving assembly, and the upper push-pull magnetic ring or the lower push-pull magnetic ring is respectively electrified or electrified, so that the driving assembly is movably matched with the sealing assembly and is used for controlling liquid input or output.

2. A precision diaphragm pump according to claim 1, wherein: the driving assembly comprises a stepping motor, a screw shaft bearing and a ball screw, the ball screw is connected with the inside of the screw shaft bearing, and the stepping motor drives the screw shaft bearing to rotate forwards or backwards so as to drive the ball screw to move leftwards or rightwards.

3. A precision diaphragm pump according to claim 2, wherein: the sealing assembly comprises a pair of small sealing diaphragms, a pair of spring assemblies, a middle large sealing diaphragm, a pushing block and a diaphragm plate, wherein the small sealing diaphragms are distributed up and down, one side of each spring assembly is connected with the corresponding upper push-pull magnetic ring and the corresponding lower push-pull magnetic ring, the other side of each spring assembly is connected with the corresponding small sealing diaphragms distributed up and down, one end of a ball screw is connected with the pushing block, the large sealing diaphragm is arranged on the pushing block, the large sealing diaphragm, the small sealing diaphragms and the diaphragm plate form a cavity, the cavity is connected with the lower liquid channel and the upper liquid channel in a matched mode, and the large sealing diaphragm and the small sealing diaphragm can be respectively in close contact with the diaphragm plate to form a sealing state.

4. A precision diaphragm pump according to claim 3, wherein: the ball screw is provided with a connecting plate, a limit screw is fixedly arranged on the connecting plate, a travel switch corresponding to the limit screw is arranged on the base, and the limit screw moves rightwards to be in contact with the travel switch.

5. A precision diaphragm pump according to any of claims 1-4, wherein: the spring component comprises an elastic seat, a first connecting piece of a spring part and a second connecting piece, the spring part is movably connected in the elastic seat, one end of the first connecting piece is connected with the upper push-pull magnetic ring, the other end of the first connecting piece is hinged with one end of the second connecting piece, the other end of the second connecting piece is hinged on the elastic seat, one side of the spring part is connected with the second connecting piece, and the other side of the spring part is connected with the small sealing diaphragm.

6. A precision diaphragm pump according to claim 5, wherein: the lower liquid channel and the upper liquid channel are respectively composed of a liquid guide joint, a sealing conical head and a guide pipe, and the guide pipe is respectively matched with the liquid guide joint and the sealing conical head in a sealing mode.

7. A precision diaphragm pump according to claim 6, wherein: the sealing component, the liquid guide joint and the sealing conical head are all made of polytetrafluoroethylene materials.

8. A precision diaphragm pump according to claim 1, wherein: the top of the large sealing diaphragm is an arc-shaped surface, and one side of the middle of the diaphragm is matched with the arc-shaped surface in shape.

9. A precision diaphragm pump according to claim 7, wherein: and a pressing plate is arranged between the liquid guide joint and the diaphragm plate, and the liquid guide joint is fixedly connected with the pressing plate through a bolt.