CN112983774A

CN112983774A - Metering pump capable of intelligently and digitally adjusting flow and application thereof

Info

Publication number: CN112983774A
Application number: CN202110472442.6A
Authority: CN
Inventors: 蔡峰
Original assignee: Jinan Shanghai Fluid Control Equipment Co ltd
Current assignee: Jinan Shanghai Fluid Control Equipment Co ltd
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2021-06-18
Also published as: WO2022227829A1

Abstract

The invention relates to a metering pump for intelligently and digitally adjusting flow and application thereof, wherein the metering pump comprises a metering pump body, a servo motor controller, a PLC (programmable logic controller) and a display screen; the metering pump body comprises a pump box body and a pump head, a connecting rod, an eccentric mechanism, a worm wheel and a worm are arranged in the pump box body, the worm is meshed with the worm wheel, the worm wheel is arranged on the eccentric mechanism, the eccentric mechanism is hinged with one end of the connecting rod, and the other end of the connecting rod is connected with the pump head through a plunger; the top end of the worm extends out of the pump box body and is in transmission connection with an output shaft of the servo motor, and the servo motor is sequentially connected with the servo motor controller, the PLC controller and the display screen. The servo motor controller operates according to an internal program of the PLC controller, the servo motor controller inputs a pulse signal for controlling the rotating speed to the servo motor, the servo motor works according to the frequency of the received pulse signal, the rotating speed is high when the frequency is high, and the rotating speed is low when the frequency is low, so that the intelligent control and regulation of the flow of the metering pump are really realized.

Description

Metering pump capable of intelligently and digitally adjusting flow and application thereof

Technical Field

The invention relates to a metering pump for intelligently and digitally adjusting flow and application thereof, belonging to the technical field of metering pumps.

Background

A metering pump is a product of the volumetric pump type for metering a liquid medium. The volume pump type chemical quantitative feeding device is volume pump equipment which provides high-precision quantitative feeding of chemical fluid and a pressure source for a quantitative feeding device in the process of quantitative feeding of chemicals in scientific research and production enterprises. For example, chinese patent document CN106762510B discloses a fast and accurate manual adjustment type constant-speed and constant-pressure metering pump, which includes a turbine, a worm, a servo motor, a speed reducer, and a motor support, wherein an input end of the speed reducer is connected to a motor shaft of the servo motor. The constant-speed constant-pressure metering pump further comprises a manual adjusting mechanism, the manual adjusting mechanism comprises a first rotating shaft, a second rotating shaft, a box body, a first gear, a second gear, a quick adjusting handle and a fine adjusting handle, and the first rotating shaft and the second rotating shaft are movably connected with the box body. Its advantage lies in, overcomes because of local not hard up influence that can cause the precision of measuring pump, and further succinct transmission's structure carries more lightly, and it is more convenient to dismantle. For another example, chinese patent document CN209925159U discloses a liquid servo metering pump, including a pump case and a servo motor installed in the pump case, a push rod and a lead screw, a metering cylinder is connected on the pump case, the push rod is arranged in the pump case in a manner that the push rod can move left and right, a piston and a piston sleeve are fixedly arranged on the right side of the push rod, a pump head is fixedly arranged on the right side of the metering cylinder, a synthetic liquid accommodating cavity is enclosed by the pump head, the pump head is provided with a first check valve and a second check valve, the lead screw is rotatably arranged in the pump case, a driven pulley is arranged at the left end of the lead screw, the right end of the lead screw is screwed with the left side of the push rod, a driving pulley is fixedly arranged on an output. The utility model discloses a control servo motor's parameter can realize the adjustment of piston extreme position, and then realizes the adjustment of filling liquid volume, and is very convenient to can be accurate control the stroke of piston, can effectual promotion filling liquid's measurement accuracy.

At present, the metering pump on the market has the following defects:

1) adopt manual flow control, generally adjust through the handle, the shortcoming is that the flow can not realize automatically regulated, and the precision is relatively poor.

2) The variable frequency regulation is adopted, the variable frequency motor is driven on the metering pump, the frequency of the driving motor is regulated on line by the frequency converter to change the rotating speed of the motor, the purpose of automatically regulating the flow of the metering pump is achieved, and the defect is that the flow of the metering pump cannot be simulated.

3) The stepping motor is arranged in a metering pump body of the metering pump to drive a stroke connecting rod arranged in the metering pump, and the flow of the metering pump is adjusted by adjusting the stroke frequency value of the connecting rod. The disadvantages are that the volume of the metering pump is increased, the metering pump can not be used as a large-flow metering pump, and the disassembly, the assembly and the maintenance are difficult.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides an intelligent digital metering pump for regulating the flow, which utilizes a servo motor to replace a common motor, utilizes a servo motor controller to automatically regulate the flow of a metering pump, programs by virtue of a PLC (programmable logic controller), performs programming control on the rotating speed pulse frequency sent to the servo motor by the servo motor controller, and feeds back signals such as rotating speed models to a display screen through the servo motor controller to simulate the flow value of the metering pump.

The invention also provides a working method of the intelligent digital flow regulation metering pump.

The technical scheme of the invention is as follows:

a metering pump for intelligently and digitally adjusting flow comprises a metering pump body, a servo motor and a servo motor controller;

the metering pump body comprises a pump box body and a pump head, a connecting rod, an eccentric mechanism, a worm wheel and a worm are arranged in the pump box body, the worm is meshed with the worm wheel, the worm wheel is arranged on the eccentric mechanism, the eccentric mechanism is hinged with one end of the connecting rod, and the other end of the connecting rod is connected with the pump head through a plunger;

the top end of the worm extends out of the pump box body and is in transmission connection with an output shaft of the servo motor, and the servo motor is connected with the servo motor controller.

Preferably, the servo motor controller is connected with a liquid crystal display screen.

Preferably, the servo motor controller is connected with the PLC firstly, and then the PLC is connected with the liquid crystal display screen.

Preferably, the center of the eccentric mechanism is connected with a manual flow regulating mechanism.

Preferably, the bottom end of the worm is fixed in the pump box body through a bearing.

Preferably, the servo motor is mounted outside the pump casing through a flange.

Preferably, the output shaft of the servo motor is connected with the top end of the worm through a coupler.

Preferably, the upper side and the lower side of the pump head are respectively connected with an inlet check valve and an outlet check valve.

Preferably, the servo motor is a loose MHMF series motor.

Preferably, the servo motor controller is selected from a loose MBDLN controller or an Anchuan controller.

Preferably, the PLC controller is Siemens PLCS7-200 or Mitsubishi PLC controller.

Preferably, the display screen is a Siemens 6AV6641 liquid crystal display screen.

A working method of an intelligent digital flow regulation metering pump comprises the following steps:

the servo motor controller inputs a pulse signal for controlling the rotating speed to the servo motor according to a program instruction of the PLC controller; the servo motor works according to the frequency of the received pulse signal;

the PLC controller programs the output pulse signals to realize the automatic regulation of the flow of the metering pump, and the stroke times of the metering pump in unit time can be converted into flow values to be displayed on the display screen in real time through the display screen.

The invention has the technical characteristics and beneficial effects that:

the metering pump for intelligently and digitally adjusting the flow rate adopts a PLC (programmable logic controller) to program, a servo motor controller operates according to an internal program of the PLC, the servo motor controller can receive external control signals through external wiring ports such as RS232 and RS485 and process the external control signals through an internal circuit of the servo motor controller to form corresponding servo motor pulse control signals, the servo motor controls the rotating speed of the servo motor according to the input pulse signals, the servo motor works according to the frequency of the received pulse signals, the rotating speed is high when the frequency is high, and the rotating speed is low when the frequency is low, so that the intelligent control and adjustment of the flow rate of the metering pump can be really realized, and manual adjustment can be completely replaced.

Drawings

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

FIG. 2 is a schematic view of a single pump head configuration;

FIG. 3 is a flow chart before speed regulation and rectification;

FIG. 4 is a graph of flow rate after speed regulation;

FIG. 5 is a graph of flow after rectification;

FIG. 6 is a schematic view of a dual pump head configuration;

FIG. 7 is a graph of flow rate before speed regulation and rectification;

FIG. 8 is a graph of flow rate after speed regulation;

FIG. 9 is a graph of flow after rectification;

FIG. 10 is a flow rate curve diagram of a pipeline after being rectified with a pulsation damper;

wherein: 1-outlet one-way valve, 2-pump head, 3-inlet one-way valve, 4-pump box, 5-eccentric mechanism, 6-worm wheel, 7-bearing, 8-worm, 9-connecting rod, 10-plunger, 11-servo motor controller, 12-PLC controller, 13-display screen, 14-flange, 15-servo motor, and 16-eccentric connecting hinge shaft.

Detailed Description

The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.

Example 1:

as shown in fig. 1, the present embodiment provides a metering pump for intelligently and digitally adjusting a flow rate, including a pump body of the metering pump, a servo motor 15 and a servo motor controller 11;

the pump body of the metering pump comprises a pump box body 4 and a pump head 2, a connecting rod 9, an eccentric mechanism 5, a worm wheel 6 and a worm 8 are arranged in the pump box body 4, the worm 8 is meshed with the worm wheel 6, the worm wheel 6 is arranged on the eccentric mechanism 5, the eccentric mechanism 5 is hinged with one end of the connecting rod 9 through an eccentric connecting hinge shaft 16, and the other end of the connecting rod 9 is connected with the pump head 2 through a plunger 10;

the top end of the worm 8 extends out of the pump box body 4 and is in transmission connection with an output shaft of a servo motor 15, and the servo motor 15 is connected with a servo motor controller 11.

The bottom end of the worm 8 is fixed in the pump housing 4 by a bearing 7. The servomotor 15 is mounted outside the pump housing 4 via a flange 14. An output shaft of the servo motor 15 is connected with the top end of the worm 8 through a coupler. The source power of servo motor 15 transmits for worm 8, worm 8 drives worm wheel 6 to rotate, worm wheel 6 drives eccentric mechanism 5 to rotate while rotating, thereby connecting rod 9 on eccentric mechanism 5 drives plunger 10 to reciprocate in pump head 2, negative pressure and positive pressure are generated by the reciprocating motion of plunger, when the plunger moves to the pump box direction, negative pressure is generated, so that chemical fluid enters the inside of the pump head at the inlet check valve of the metering pump when negative pressure is generated, thereby realizing the opening of the inlet check valve port and the closing of the outlet valve, when the plunger moves to the pump head direction, the inlet check valve is closed, the outlet check valve is opened, chemical fluid flows out from the outlet check valve, and the metering pump can repeat the above operations repeatedly to realize the chemical addition of the metering pump.

The upper side and the lower side of the pump head 2 are respectively connected with an inlet one-way valve 3 and an outlet one-way valve 1. The servo motor 15 is a loose MHMF motor. The servo motor controller 11 is selected from a loose MBDLN or Anchuan controller.

The servo motor in the embodiment can also be replaced by a stepping motor, and the servo motor controller can also be replaced by a stepping motor controller.

The contact part of the front end of the metering pump plunger piston and chemicals can be replaced by chemical corrosion resistant materials such as PTFE or stainless steel diaphragms, and the mechanical diaphragm metering pump is such as the existing Milton Ro G series, Shengruian MB and MC single-head double-head series on the market; or the part of the front end of the plunger of the metering pump, which is contacted with the chemicals, can be changed into hydraulic oil, the plunger pushes the hydraulic oil, and the other end of the hydraulic oil is provided with a diaphragm which can resist chemical corrosion, such as: PTFE or stainless steel, hydraulic diaphragm metering pumps such as the current Miton Ro MROY series single-head double-head metering pumps on the market, surpass the Ruilan HE, HG and HK series single-head double-head metering pumps.

Example 2:

the structure of a metering pump for intelligently and digitally adjusting the flow is as described in embodiment 1, and the difference is that: the servo motor controller 11 is connected with a liquid crystal display 13, and the liquid crystal display 13 is a Siemens 6AV6641 liquid crystal display. The servo motor control device can be used for on-site workers to check the operation parameters of the servo motor in real time and convert the operation parameters into flow parameters and pulse frequency parameters.

Example 3:

the structure of a metering pump for intelligently and digitally adjusting the flow is as described in embodiment 2, and the difference is that: the servo motor controller 11 is connected with the PLC controller 12 firstly, and the PLC controller 12 is connected with the liquid crystal display screen 13. The PLC controller 12 is Siemens PLCS7-200 or Mitsubishi PLC controller.

According to the technical scheme, the PLC is adopted, the pulse signals are input into the servo motor controller through writing programs into the PLC, so that the servo motor controller controls the whole operation process of the servo motor, and the flow of the metering pump is regulated and rectified.

Example 4:

the structure of a metering pump for intelligently and digitally adjusting the flow is as described in embodiment 1, and the difference is that: the eccentric mechanism center is connected to a manual flow regulating mechanism (not shown in the figure). When the intelligent operation of the PLC controller is not adopted, the rotating stroke displacement degree of the eccentric mechanism can be manually controlled through the manual flow adjusting mechanism on the outer side of the pump box body, so that the flow of the metering pump is adjusted.

Example 5:

a working method of a metering pump capable of intelligently and digitally adjusting flow is characterized in that the metering pump in embodiment 1 is utilized, and specific working processes are as follows for application occasions of a single pump head: the servo motor controller inputs a pulse signal for controlling the rotating speed to the servo motor according to a program instruction of the PLC controller; the servo motor works according to the frequency of the received pulse signal;

the PLC controller programs the output pulse signals to realize the automatic regulation of the flow of the metering pump, and the stroke times of the metering pump can be converted into flow values through the display screen to be displayed on the display screen in real time.

Fig. 2 is a schematic view of a single pump head, fig. 3 is a flow rate graph of a metering pump without being operated by a PLC controller, and fig. 4 is a flow rate graph after being adjusted in speed by the PLC controller.

Fig. 5 is a sine wave of a flow curve of a metering pump, which is accelerated by a small-section servo motor to increase the flow value, the flow reaches the average value of a horizontal line when the sine curve is accelerated in the initial section as shown in fig. 5, and the flow in the peak section of the sine curve is decelerated (decelerated) by the servo motor to make the flow curve approach the average value of the horizontal line, so that the flow curve can be in a horizontal straight line, that is, the flow is stable.

Example 6:

a working method of a metering pump capable of intelligently and digitally adjusting flow is characterized in that the metering pump in embodiment 1 is utilized, and specific working processes are as follows for application occasions with double pump heads: the servo motor controller inputs a pulse signal for controlling the rotating speed to the servo motor according to a program instruction of the PLC controller; the servo motor works according to the frequency of the received pulse signal;

Fig. 6 is a schematic of the structure of the dual pump heads, fig. 7 is a graph of the sinusoidal flow rate of the metering pump without the action of the PLC controller, and fig. 8 is a graph of the servo motor after speed adjustment (deceleration) to show the flow rate decrease.

Fig. 9 is a sine wave of a flow curve of a metering pump, which is accelerated by a small-section servo motor to increase the flow value, the flow reaches a horizontal line average value when the sine curve is accelerated in the initial section as shown in fig. 9, and the flow in the peak section of the sine curve is decelerated (decelerated) by the servo motor to make the flow curve approach the horizontal line average value, so that the flow curve can be in a horizontal straight line, that is, the stable fluid.

Fig. 10 shows that after the pulsation damper is additionally arranged on the feeding pipeline, the output flow curve of the double-head pump tends to a horizontal straight line after rectification is performed again by the pulsation damper. The advantage of doing so is, to chemical industry, daily use chemicals, casting, papermaking, tobacco, water treatment, the stable accurate technology of throwing chemicals of requirement such as laboratory, has had a more reliable throwing and has added the equipment, can show to improve later stage product goodness rate, practices thrift the chemical volume of throwing, throws to throw and opens up more extensive field for the accurate throwing of measuring pump.

The above description is only for the specific embodiments of the present invention, and the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.

Claims

1. A metering pump for intelligently and digitally adjusting flow is characterized by comprising a metering pump body, a servo motor and a servo motor controller;

2. The intelligent digital flow-regulating metering pump according to claim 1, wherein the servo motor controller is connected to a liquid crystal display.

3. The intelligent digital flow-regulating metering pump according to claim 2, wherein the servo motor controller is connected to the PLC controller, and the PLC controller is connected to the liquid crystal display screen.

4. The intelligent digital flow-regulating metering pump according to claim 1, wherein the eccentric mechanism center is connected to a manual flow-regulating mechanism.

5. The intelligent digital flow-regulating metering pump according to claim 1, wherein the bottom end of the worm is fixed in the pump box body through a bearing.

6. The intelligent digital flow-regulating metering pump according to claim 1, wherein the servo motor is flange-mounted on the outside of the pump housing.

7. The intelligent digital flow-regulating metering pump according to claim 1, wherein the output shaft of the servo motor is connected with the top end of the worm through a coupling.

8. The intelligent digital flow-regulating metering pump according to claim 1, wherein the upper and lower sides of the pump head are respectively connected with an inlet check valve and an outlet check valve.

9. A method of operating an intelligent digitally regulated flow metering pump according to any of claims 1 to 8 including the steps of: