A precision diaphragm pump

Abstract

The present invention mainly discloses a precision diaphragm pump, and its technical solution includes a PLC controller, a machine base, a driving component, an upper push-pull magnetic ring, a lower push-pull magnetic ring, a sealing component, and a lower liquid channel and an upper liquid channel. The PLC controller controls the upper push-pull magnetic ring, the lower push-pull magnetic ring and the driving component respectively, and controls the upper push-pull magnetic ring or the lower push-pull magnetic ring to be powered or powered off respectively, so that the driving component and the sealing component can be coordinated to control the input or output of liquid. The outflow speed of the liquid can be controlled by changing the rotation speed of the stepper motor, so that the liquid intake amount can be adjusted, thereby achieving precise controllability, and the positive and negative flow directions of the liquid can be easily changed.

Description

Technical Field

[0001] The invention relates to the technical field of pumps, in particular to a precision diaphragm pump. Background Art

[0002] At present, the most common pump for conveying strong acid and alkali liquids is the electromagnetic diaphragm pump. The electromagnetic diaphragm pump is a type of metering pump. The metering pump is a special positive displacement pump that can measure the conveyed fluid. The difference between the electromagnetic diaphragm metering pump and other metering pumps is mainly the driving part. The diaphragm metering pump draws the liquid from the medicine box and injects it into the system through the movement of the diaphragm. The metering pump is a tool for conveying liquids. Each time the plunger in the pump reciprocates, the volume of the liquid conveyed is fixed, thereby realizing the metering function.

[0003] However, the electromagnetic diaphragm metering pumps currently on the market can only transport liquid in one direction and cannot back-pump liquid. This will cause highly corrosive liquids to remain in the pump for a long time, thereby damaging the pump structure and affecting the life of the pump. In addition, this type of pump is also inaccurate in controlling tiny liquid flows. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a precision diaphragm pump that can effectively, stably and accurately transport strong acid and strong alkali liquids, and can make the liquid intake amount adjustable, and can also easily change the forward and reverse flow direction of the liquid.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a precision diaphragm pump, including a PLC controller, a base, a drive assembly, an upper push-pull magnetic ring, a lower push-pull magnetic ring, a sealing assembly, and a lower liquid channel and an upper liquid channel. The PLC controller controls the upper push-pull magnetic ring, the lower push-pull magnetic ring and the drive assembly respectively, and controls the upper push-pull magnetic ring or the lower push-pull magnetic ring to be powered or de-powered respectively, so that the drive assembly and the sealing assembly can be flexibly coordinated to control the input or output of liquid.

[0006] Preferably, the driving assembly includes a stepper motor, a screw bearing and a ball screw, the ball screw is connected to the screw bearing, and the stepper motor drives the screw bearing to rotate forward or reverse, thereby driving the ball screw to move left or right.

[0007] Preferably: the sealing assembly includes a pair of small sealing diaphragms distributed up and down, a pair of spring assemblies, a large sealing diaphragm in the middle, a push block and a diaphragm plate, one side of the pair of spring assemblies is respectively connected to the corresponding upper push-pull magnetic ring and the lower push-pull magnetic ring, the other side of the pair of spring assemblies is respectively connected to the corresponding small sealing diaphragms distributed up and down, one end of the ball screw is connected to the push block, the large sealing diaphragm is installed on the push block, the large sealing diaphragm, the small sealing diaphragm and the diaphragm plate form a chamber, the chamber is respectively connected to the lower liquid channel and the upper liquid channel, and the large sealing diaphragm and the small sealing diaphragm can be in close contact with the diaphragm plate to form a sealed state. When the stepper motor is running forward or reverse, it can drive the screw bearing to rotate forward or reverse, drive the ball screw to move left or right, thereby driving the large sealing diaphragm to perform the same displacement action, the upper push-pull magnetic ring and the lower push-pull magnetic ring are in a power-off or power-on state, so that the small sealing diaphragm and the diaphragm plate are in close contact or form a gap, thereby controlling the inflow and outflow of liquid.

[0008] Preferably: the ball screw is provided with a connecting plate, a limit screw is fixedly provided on the connecting plate, a travel switch corresponding to the limit screw is provided on the machine base, and the limit screw moves to the right and contacts the travel switch. When the ball screw moves to the right, it drives the limit screw on the connecting plate to move to the right together, and after the limit screw moves to the right and contacts the travel switch, it is fed back to the PLC controller, thereby controlling the stepper motor to reverse, and stop after reversing to a fixed number of turns.

[0009] Preferably: the spring assembly includes an elastic seat, a first connecting piece and a second connecting piece of the spring member, the spring member is movably connected in the elastic seat, one end of the first connecting piece is connected to the upper push-pull magnetic ring, the other end of the first connecting piece is hinged to one end of the second connecting piece, the other end of the second connecting piece is hinged to the elastic seat, and one side of the spring member is connected to the second connecting piece, and the other side of the spring member is connected to the small sealing diaphragm. The spring assembly has the same structure as the upper push-pull magnetic ring or the lower push-pull magnetic ring. When the upper push-pull magnetic ring is energized, the first connecting piece and the second connecting piece are driven to move, thereby driving the spring member to pull to the left, and the upper small sealing diaphragm is also displaced to the left, and the upper channel is opened; when the upper push-pull magnetic ring loses power, the upper small sealing diaphragm is ejected under the thrust of the spring member, and can be in close contact with the diaphragm to form a sealed state.

[0010] Preferably, the sealing component, the liquid guide joint and the sealing cone are all made of polytetrafluoroethylene, which is resistant to acid, alkali and various organic solvents.

[0011] Preferably, the top of the large sealing diaphragm is an arc-shaped surface, and one side in the middle of the diaphragm plate is adapted to the shape of the arc-shaped surface, thereby increasing the contact area and improving the sealing effect.

[0012] Preferably, the lower liquid channel and the upper liquid channel are both composed of a liquid guiding joint, a sealing cone head and a catheter, and the catheter is sealed with the liquid guiding joint and the sealing cone head respectively, so the sealing effect is good.

[0013] Preferably: a pressure plate is installed between the liquid-conducting joint and the diaphragm plate, and the liquid-conducting joint is fixedly connected to the pressure plate by bolts and is firmly installed.

[0014] The present invention has the beneficial effects of:

[0015] It can effectively, stably and accurately deliver strong acid and alkali liquids. By changing the speed of the stepper motor to control the outflow speed of the liquid, the amount of liquid input can be adjusted, thereby achieving precise controllability. By controlling the rotation direction of the stepper motor and the coordinated action of the upper push-pull magnetic ring or the lower push-pull magnetic ring, the positive and negative flow direction of the liquid can be easily changed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional schematic diagram of the present invention;

[0017] Figure 2 It is a schematic diagram of the structure of the present invention;

[0018] Figure 3 This is a schematic diagram of the diaphragm pump of the present invention in a static state;

[0019] Figure 4 It is a schematic diagram of the liquid input state in the diaphragm pump of the present invention;

[0020] Figure 5 It is a schematic diagram of the liquid output state in the diaphragm pump of the present invention;

[0021] Figure 6 This is a schematic diagram of the distance calibration between the limit screw and the travel switch in the present invention;

[0022] Figure 7 It is a working schematic diagram of the contact between the limit screw and the travel switch in the present invention.

[0023] Figure numerals: 1. base; 2. drive assembly; 21. stepper motor; 22. screw bearing; 23. ball screw; 3. upper push-pull magnetic ring; 4. lower push-pull magnetic ring; 5. sealing assembly; 51. small sealing diaphragm; 52. spring assembly; 53. large sealing diaphragm; 54. push block; 55. diaphragm plate; 56. chamber; 6. lower liquid channel; 7. upper liquid channel; 8. connecting plate; 9. limit screw; 10. travel switch; 11. elastic seat; 12. spring member; 13. first connecting piece; 14. second connecting piece; 15. liquid guide joint; 16. sealing cone head; 17. conduit; 18. joint cover; 19. pressure plate. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are further described in detail with reference to the accompanying drawings.

[0025] like Figure 1-7The precision diaphragm pump includes a PLC controller, a base 1, a drive assembly 2, an upper push-pull magnetic ring 3, a lower push-pull magnetic ring 4, a sealing assembly 5, a lower liquid channel 6 and an upper liquid channel 7. The PLC controller controls the upper push-pull magnetic ring 3, the lower push-pull magnetic ring 4 and the drive assembly 2 respectively, and controls the upper push-pull magnetic ring 3 or the lower push-pull magnetic ring 4 to be powered or de-powered respectively, so that the drive assembly 2 and the sealing assembly 5 can be flexibly matched to control the input or output of liquid. It is a prior art that the PLC controller controls each component, and the present invention does not describe it in detail. The lower liquid channel 6 and the upper liquid channel 7 are both composed of a liquid guide joint 15, a sealing cone head 16 and a conduit 17. The conduit 17 is respectively sealed with the liquid guide joint 15 and the sealing cone head 16, and the sealing effect is good. A joint cover 18 can also be set on the outside of the liquid guide joint 15.

[0026] The driving assembly 2 includes a stepper motor 21, a screw bearing 22 and a ball screw 23. The ball screw 23 is connected to the screw bearing 22. The stepper motor 21 drives the screw bearing 22 to rotate forward or reverse, thereby driving the ball screw 23 to move left or right. A connecting plate 8 is provided on the ball screw 23, and a limit screw 9 is fixed on the connecting plate 8. A travel switch 10 corresponding to the limit screw 9 is provided on the machine base 1. The limit screw 9 moves to the right and contacts the travel switch 10. The travel switch is a prior art and the present invention does not provide a specific principle description.

[0027] When the stepper motor 21 rotates forward or reversely, it can drive the screw bearing 22 to rotate forward or reversely, drive the ball screw 23 to move left or right, and thus drive the large sealing diaphragm 53 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, so that the small sealing diaphragm 51 and the diaphragm plate 55 are in close contact or form a gap, thereby controlling the inflow and outflow of liquid.

[0028] The sealing assembly 5 includes a pair of small sealing diaphragms 51 distributed up and down, a pair of spring assemblies 52, a large sealing diaphragm 53 in the middle, a push block 54 and a diaphragm plate 55. One side of the pair of spring assemblies 52 is respectively connected to the corresponding upper push-pull magnetic ring 3 and the lower push-pull magnetic ring 4, and the connection structure is the same. The spring assembly 52 includes an elastic seat 11, a first connecting piece 13 and a second connecting piece 14 of a spring member 12. The spring member 12 is movably connected in the elastic seat 11. One end of the first connecting piece 13 is connected to the upper push-pull magnetic ring 3, and the other end of the first connecting piece 13 is hinged to one end of the second connecting piece 14. The other end of the second connecting piece 14 is hinged to the elastic seat 11, and one side of the spring member 12 is connected to the second connecting piece 14, and the other side of the spring member 12 is connected to the small sealing diaphragm 51. One end of the ball screw 23 is connected to the push block 54, and the large sealing diaphragm 53 is installed on the push block 54. The large sealing diaphragm 53, the small sealing diaphragm 51 and the diaphragm plate 55 form a chamber 56. The chamber 56 is respectively connected with the lower liquid channel 6 and the upper liquid channel 7, and the large sealing diaphragm 53 and the small sealing diaphragm 51 can be in close contact with the diaphragm plate 55 to form a sealed state. When the upper push-pull magnetic ring 3 is energized, the first connecting piece 13 and the second connecting piece 14 are driven to move, thereby driving the spring member 12 to pull to the left, and the upper small sealing diaphragm 51 is also displaced to the left, and the upper channel is opened; when the upper push-pull magnetic ring 3 loses power, the upper small sealing diaphragm 51 is ejected under the thrust of the spring member 12, and can be in close contact with the diaphragm plate 55 to form a sealed state.

[0029] The sealing assembly 5, the liquid guide joint 15 and the sealing cone head 16 are all made of polytetrafluoroethylene, which is resistant to acid, alkali and various organic solvents. The top of the large sealing diaphragm 53 is an arc surface, and the middle side of the diaphragm plate 55 is adapted to the shape of the arc surface, which increases the contact area and improves the sealing effect. A pressure plate 19 is installed between the liquid guide joint 15 and the diaphragm plate 55, and the liquid guide joint 15 is fixedly connected to the pressure plate 19 by bolts and is firmly installed.

[0030] Working principle: When the diaphragm pump is just started, the distance calibration of the large sealing diaphragm 53 is performed. The adjustment method is as follows: the stepper motor 21 rotates forward to drive the screw bearing 22, so that the ball screw 23 moves to the right, and the connecting plate 8 fixed on the ball screw 23 moves to the right together. 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 stepper motor 21 reverses, and the ball screw 23 moves to the left, and stops after a fixed number of turns. The purpose of calibration is that after the diaphragm pump stops at any time and before the next start-up, it can be reset to a specific position, which is the origin position. Only when the stepper motor 21 runs to the origin position can the next step of operation be performed.

[0031] The static state refers to the state of the diaphragm pump waiting to run after completing the distance calibration. At this time, the upper push-pull magnetic ring 3 and the lower push-pull magnetic ring 4 are in a de-energized and relaxed state, and the small sealing diaphragms 51 distributed above and below are pushed out by the spring parts 12 and fit tightly with the diaphragm plate 55 to form a sealed state.

[0032] refer to Figure 4 In the liquid input state: the lower push-pull magnetic ring 4 is energized, driving the first connecting piece 13 and the second connecting piece 14 to move, thereby driving the spring member 12 to be pulled to the left, and similarly the lower small sealing diaphragm 51 is displaced to the left under the action of the pulling force, and the lower channel is opened; at this time, the stepper motor 21 reverses, the ball screw 23 moves to the left, driving the large sealing diaphragm 53 to be displaced to the left, so that the large sealing diaphragm 53 and the chamber 56 of the diaphragm plate 55 form a vacuum suction force, and the liquid in the lower liquid channel 6 is drawn into the chamber 56; after the stepper motor 21 runs into place, the motor stops, the lower push-pull magnetic ring 4 loses power, and the lower small sealing diaphragm 51 is pushed out to the right under the action of the thrust of the spring member 12, and the small sealing diaphragm 51 is in close contact with the diaphragm plate 55 again, forming a sealed state.

[0033] refer to Figure 5 Liquid output state: the upper push-pull magnetic ring 3 is energized, driving the first connecting piece 13 and the second connecting piece 14 to move, thereby driving the spring member 12 to pull to the left, and the upper small sealing diaphragm 51 is also displaced to the left, and the upper channel is opened; at this time, the stepper motor 21 rotates forward, driving the large sealing diaphragm 53 to move to the right, squeezing out the liquid between the large sealing diaphragm 53 and the diaphragm plate 55, and the liquid flows out through the upper liquid channel 7; in this state, the liquid outflow speed can be controlled by changing the speed of the stepper motor 21. The speed of the stepper motor 21 is controlled by the driver, and the driver is controlled by the PLC controller, so as to achieve precise controllability. After the stepper motor 21 runs into place, the motor stops, the upper push-pull magnetic ring 3 loses power, and the upper small sealing diaphragm 51 is ejected under the thrust of the spring member 12, and forms a sealing state with the diaphragm plate 55.

[0034] The above completed action is a single forward pumping operation of the diaphragm pump, which is recorded as one forward pumping operation cycle; the opposite operation is a reverse pumping operation. When the diaphragm pump is running, the number of running circles of the stepper motor 21 is a fixed number of circles, so that the input and output liquid flow rates of each operation cycle are also fixed values.

[0035] The above embodiments are only used to explain the inventive concept of the present invention, rather than to limit the protection of the rights of the present invention. Any non-substantial changes to the present invention using this concept shall fall within the protection scope of the present invention.

Claims

1. A precision diaphragm pump, characterized in that: It includes a PLC controller, a machine base, a driving component, an upper push-pull magnetic ring, a lower push-pull magnetic ring, a sealing component, and a lower liquid channel and an upper liquid channel. The PLC controller controls the upper push-pull magnetic ring, the lower push-pull magnetic ring, and the driving component respectively, and controls the upper push-pull magnetic ring or the lower push-pull magnetic ring to be powered or de-powered respectively, so that the driving component and the sealing component can be coordinated to control the input or output of liquid; The driving assembly includes a stepper motor, a screw bearing and a ball screw. The ball screw is connected to the screw bearing. The stepper motor drives the screw bearing to rotate forward or reverse, thereby driving the ball screw to move left or right. The sealing assembly includes a pair of small sealing diaphragms distributed up and down, a pair of spring assemblies, a large sealing diaphragm in the middle, a push block and a diaphragm plate. One side of the pair of spring assemblies is respectively connected to the corresponding upper push-pull magnetic ring and the lower push-pull magnetic ring, and the other side of the pair of spring assemblies is respectively connected to the corresponding small sealing diaphragms distributed up and down. One end of the ball screw is connected to the push block. The large sealing diaphragm is installed on the push block. The large sealing diaphragm, the small sealing diaphragm and the diaphragm plate form a chamber. The chamber is respectively connected to the lower liquid channel and the upper liquid channel, and the large sealing diaphragm and the small sealing diaphragm can be in close contact with the diaphragm plate to form a sealing state; the top of the large sealing diaphragm is an arc surface, and the middle side of the diaphragm plate is adapted to the shape of the arc surface; The ball screw is provided with a connecting plate, a limit screw is fixedly provided on the connecting plate, a travel switch corresponding to the limit screw is provided on the machine base, and the limit screw moves to the right and contacts the travel switch.

2. A precision diaphragm pump according to claim 1, characterized in that: The spring assembly includes an elastic seat, a first connecting piece of the spring member and a second connecting piece. The spring member is movably connected in the elastic seat. One end of the first connecting piece is connected to the upper push-pull magnetic ring, the other end of the first connecting piece is hinged to one end of the second connecting piece, the other end of the second connecting piece is hinged to the elastic seat, and one side of the spring member is connected to the second connecting piece, and the other side of the spring member is connected to the small sealing diaphragm.

3. A precision diaphragm pump according to claim 2, characterized in that: The lower liquid channel and the upper liquid channel are both composed of a liquid guiding joint, a sealing cone head and a catheter, and the catheter is respectively sealed with the liquid guiding joint and the sealing cone head.

4. A precision diaphragm pump according to claim 3, characterized in that: The sealing assembly, the liquid guide joint and the sealing cone are all made of polytetrafluoroethylene.

5. A precision diaphragm pump according to claim 3, characterized in that: A pressure plate is installed between the liquid-conducting joint and the diaphragm plate, and the liquid-conducting joint is fixedly connected to the pressure plate by bolts.

Images