CN110410674B - Method for realizing small-flow high-precision metering and filling by conventional metering pump - Google Patents
Method for realizing small-flow high-precision metering and filling by conventional metering pump Download PDFInfo
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- CN110410674B CN110410674B CN201910699817.5A CN201910699817A CN110410674B CN 110410674 B CN110410674 B CN 110410674B CN 201910699817 A CN201910699817 A CN 201910699817A CN 110410674 B CN110410674 B CN 110410674B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 claims abstract description 62
- 239000012530 fluid Substances 0.000 claims abstract description 50
- 239000000463 material Substances 0.000 claims abstract description 50
- 238000002955 isolation Methods 0.000 claims abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 36
- 239000007788 liquid Substances 0.000 claims description 33
- 229910052757 nitrogen Inorganic materials 0.000 claims description 18
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- 238000013461 design Methods 0.000 claims description 8
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- 238000001914 filtration Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
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- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
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- 238000003889 chemical engineering Methods 0.000 description 1
- -1 chemical engineering Substances 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
Abstract
A method for realizing small-flow high-precision metering and filling by a conventional metering pump comprises a set of control device for realizing small-flow high-precision metering and filling, wherein the control device comprises a Y-shaped filter, a safety valve, a buffer with a pressure gauge, a bypass ball valve, an isolation ball valve, a flow meter, a small-flow regulating valve, a check valve, a throttle valve and a control cabinet, the conventional metering pump can realize the control precision of the flow below 10 percent under the support of the flow meter, the small-flow regulating valve, the buffer with the pressure gauge, the control cabinet and other accessories, the accumulated error is reduced, the aim of precise metering can be fulfilled, the control device has the characteristics of reliable structure, high efficiency and low cost, the filling precision of fluid materials at the flow below 10 percent is ensured, and the re-investment is saved.
Description
Technical Field
The invention belongs to the technical field of metering equipment control, and particularly relates to a method for realizing small-flow high-precision metering and filling by using a conventional metering pump.
Background
The metering pump is a special volumetric pump for conveying liquid, particularly corrosive liquid, and is widely applied to fine filling in industries such as petroleum, chemical engineering, water treatment, food, pharmacy, environmental protection, medical appliances and the like.
The flow of the metering pump can be stepless regulated within the range of 0-100%, according to the structural characteristics of the metering pump, the metering precision can reach +/-1% when the flow is regulated within the range of 10-100%, and if the flow is below 10%, the flow control precision is low, the accumulated error is large, and the accurate metering cannot be achieved.
In both cases it may occur that the metering pump flow may operate in the range below 10%.
The first is that the filling amount is reduced due to the change of the production process, and the filling pump must work below 10 percent;
the second is that under the condition of over-small flow, for example, the flow is less than 0.5L/h, the manufacturers for producing the small metering pump are few, the manufacturing difficulty is high, the construction period is long, and the manufacturing cost is too high, so that the conventional metering pump can replace the small metering pump and be used for the flow control of less than 10 percent.
Disclosure of Invention
In order to solve the problems in the second situation, the invention provides a method for realizing small-flow high-precision metering and filling by using a conventional metering pump, the method can realize high-precision metering and filling with flow of less than 10% by using the conventional metering pump, and has the advantages of high efficiency, low cost, guaranteed filling precision and saved re-investment.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for realizing small-flow high-precision metering and filling by a conventional metering pump is characterized in that the conventional metering pump is used for metering the flow of fluid materials conveyed by a dosing tank, a liquid level meter is assembled on one side of the dosing tank, the upper end and the lower end of the liquid level meter are connected with the dosing tank through valves, and a drain valve is assembled at the bottom of the dosing tank.
In the control device, the inlet end of a Y-shaped filter is connected to the bottom of a dosing tank through a valve, the outlet end of the Y-shaped filter is respectively connected with a conventional metering pump and a safety valve in parallel through a pipeline, the outlet end of the safety valve is respectively connected with a pressure gauge buffer and a throttle valve in series through a pipeline, the outlet end of the conventional metering pump is connected with a check valve after being connected with a pipeline between the pressure gauge buffer and the throttle valve through a pipeline, the check valve is connected with a small flow regulating valve through a pipeline, the small flow regulating valve is connected with an isolation ball valve, a flowmeter and an isolation ball valve in series through pipelines, a bypass ball valve is connected on a bypass between the upper isolation ball valve and the lower isolation ball valve in parallel, and an electric control end of the conventional;
in the control device, the conventional metering pump is used for conveying the fluid material and controlling the output flow of the fluid material through the adjustment of the control cabinet, and the output flow can be controlled to be below 10%; the flowmeter is used for detecting the output instantaneous flow and transmitting the flow to the control cabinet in an electric pulse signal of 4-20 mA; the small flow regulating valve is used for receiving signals from the control cabinet to control the opening degree of the valve and regulate output flow; the control cabinet is used for acquiring the flow signal of the flowmeter in real time, comparing the flow signal with a set flow signal for logic processing, and then sending an adjusting signal to the small-flow regulating valve; the buffer with the pressure gauge is used for playing a role of wave-smoothing wave on the pulsating flow output by the conventional metering pump; the throttle valve is used for regulating and controlling the flow and the pressure in the return pipeline; the check valve is used for preventing the backflow phenomenon of the fluid material at the outlet end of the conventional metering pump; the safety valve is used for controlling the pressure of the pipeline at the inlet end of the conventional metering pump and preventing overpressure;
under the support of the control device, when in use, the conventional metering pump with the set stroke adjusted through the control cabinet pressurizes and injects the fluid material stored in the dosing tank at the flow rate of below 10 percent through the Y-shaped filter, impurities in the fluid material can be removed through the filtering of the Y-shaped filter, the fluid material with the impurities removed enters the flow meter through the outlet end of the conventional metering pump, the check valve, the small flow regulating valve and the isolation ball valve, at the moment, the flow meter displays the current instant flow and converts the instant flow value into an electric pulse signal of 4-20 mA to be transmitted to the control cabinet, a PLC system in the control cabinet compares and adjusts the electric pulse signal after the control cabinet receives the electric pulse signal according to design data of the PLC system to obtain an output digital value, the digital value is amplified, driven, converted into a D/A (digital to analog) and outputs a control signal to be fed back to the small flow regulating valve, and the opening of the small flow regulating valve is adjusted Measuring requirements, realizing high-precision precise filling of the fluid material, circulating the redundant fluid material at the outlet end of the conventional metering pump back to the dosing tank through a throttle valve, and respectively preventing the fluid material from flowing back to the outlet end of the conventional metering pump through a check valve and a bypass ball valve;
the capacity of the buffer with the pressure gauge is more than 10 times of the immediate passing capacity of a conventional metering pump, a nitrogen inlet and a nitrogen outlet are respectively arranged at the top of the buffer with the pressure gauge, the top of the buffer with the pressure gauge is also provided with the pressure gauge, the pressure gauge is used for detecting the pressure of nitrogen in the buffer with the pressure gauge, when the pressure of nitrogen in the buffer with the pressure gauge is insufficient, the nitrogen is supplemented in time through a nitrogen injection tool, the inlet of the fluid material is arranged at the upper end of the side surface of the buffer with the pressure gauge, the height of the upper end of the side surface is 60-70% of the whole height of the buffer with the pressure gauge, and the fluid material flows in from the upper end of the side surface of the buffer with the pressure;
the flow meter adopts a turbine flow meter, the turbine flow meter converts the flow speed of the fluid material passing through a small flow regulating valve into the rotating speed of a turbine, then converts the rotating speed of the turbine into a 4-20 mA electric pulse signal which is in direct proportion to the flow, the frequency of the electric pulse signal is in direct proportion to the flow of the fluid material to be measured and transmits the electric pulse signal to a PLC system in a control cabinet, and the instant flow and the accumulated flow are displayed through integrated LCD indicating meters respectively configured in the control cabinet;
the small flow regulating valve adopts a manual stroke regulating mode or an electric stroke regulating mode, the small flow regulating valve is required to be marked with scale indication, a valve positioner is required to be arranged at the valve of the small flow regulating valve, the valve positioner can change a 4-20 mA electric pulse signal output by the control cabinet into an air/electric signal for driving the small flow regulating valve to act, so that the small flow regulating valve has corresponding valve opening, and the precision requirement of the valve opening of the small flow regulating valve reaches +/-1%.
The conventional metering pump adopts a hydraulic double-diaphragm metering pump, the metering accuracy of the hydraulic double-diaphragm metering pump is required to be higher than +/-1% in a flow range of 10-100%, the pressure or flow at the outlet end of the hydraulic double-diaphragm metering pump is required to be in a negative deviation-free state, and a pressure gauge for monitoring double-diaphragm rupture and a calibration column for fluid material dosage are respectively configured on the hydraulic double-diaphragm metering pump.
The liquid level meter is either an on-site liquid level meter or a remote liquid level meter; the on-site liquid level meter adopts a magnetic turning plate liquid level meter or a glass plate liquid level meter; the remote transmission liquid level meter adopts a double-flange liquid level transmitter.
Due to the adoption of the technical scheme, the invention has the following positive effects:
1. the control device solves the problem of the conventional metering pump that the flow rate is less than 10 percent, and the conventional metering pump realizes high-precision metering filling of the flow rate of less than 10 percent.
2. After the control cabinet receives the flow signal of the flowmeter, the control cabinet firstly compares the received signal with the PLC system design data in the control cabinet and carries out logical operation, so that the control cabinet can output a control signal to the small flow regulating valve, and the control cabinet also has the function of controlling other electric equipment, such as the starting and stopping function of a metering pump.
Drawings
FIG. 1 is a schematic illustration of the structure of the present invention.
In fig. 1: 1-a dosing tank, 2-a liquid level meter, 3-a blowdown valve, 4-a Y-shaped filter, 5-a conventional metering pump, 6-a safety valve, 7-a buffer with a pressure meter, 8-a bypass ball valve, 9-an isolation ball valve, 10-a flow meter, 11-a small flow regulating valve, 12-a check valve, 13-a throttle valve and 14-a control cabinet.
Detailed Description
The invention relates to a method for realizing small-flow high-precision metering and filling by a conventional metering pump, which can achieve the metering precision of +/-1% when the conventional metering pump is regulated within the flow range of 10-100%, and has the problems of low flow control precision, large accumulative error and incapability of achieving precise metering when the flow is below 10%.
Referring to the figure 1 in full text, for most industries needing to convey fluid materials, a conventional metering pump (5) is used for metering the flow of the fluid materials conveyed by a dosing tank, one side of the dosing tank (1) is provided with a liquid level meter (2), the upper end and the lower end of the liquid level meter are connected with the dosing tank through valves, the bottom of the dosing tank is provided with a drain valve (3), and the liquid level meter is either a local liquid level meter or a remote transmission liquid level meter; the on-site liquid level meter adopts a magnetic turning plate liquid level meter or a glass plate liquid level meter; the remote transmission liquid level meter adopts a double-flange liquid level transmitter.
The invention comprises a set of control device for realizing small-flow high-precision metering and filling, wherein the control device comprises a Y-shaped filter (4), a safety valve (6), a buffer (7) with a pressure gauge, a bypass ball valve (8), an isolation ball valve (9), a flow meter (10), a small-flow regulating valve (11), a check valve (12), a throttle valve (13) and a control cabinet (14), wherein a PLC (programmable logic controller) system and other electric appliance control devices are arranged in the control cabinet, and the control cabinet also has the function of controlling the storage or modification of design data of other electric equipment, such as the starting and stopping functions of a metering pump, and the small flow of the pump is that the flow of fluid materials in a conventional metering and feeding tank is below 10%.
The structural connection mode of the related control device refers to the technical scheme and is not described in detail. But need to be explained as follows:
1. in the control device, the conventional metering pump is used for conveying the fluid material and controlling the output flow of the fluid material through the adjustment of the control cabinet, and the output flow can be controlled below 10%.
2. The flowmeter is used for detecting the output instantaneous flow and transmitting the flow to the control cabinet by an electric pulse signal of 4-20 mA. The flow meter adopts a turbine flow meter, the turbine flow meter converts the flow speed of the fluid material passing through a small flow regulating valve into the rotating speed of a turbine, then converts the rotating speed of the turbine into a 4-20 mA electric pulse signal which is in direct proportion to the flow, the frequency of the electric pulse signal is in direct proportion to the flow of the fluid material to be measured, and the electric pulse signal is transmitted to a PLC system in a control cabinet, and the instant flow and the accumulated flow are displayed through integrated LCD indicating meters respectively configured in the control cabinet.
3. The small flow regulating valve is used for receiving signals from the control cabinet to control the opening degree of the valve and regulate output flow. The small flow regulating valve adopts a manual stroke regulating mode or an electric stroke regulating mode, the small flow regulating valve is required to be marked with scale indication, a valve positioner is required to be arranged at the valve of the small flow regulating valve, the valve positioner can change 4-20 mA electric pulse signals output by the control cabinet into air/electric signals for driving the small flow regulating valve to act, so that the small flow regulating valve has corresponding valve opening, and the precision requirement of the valve opening of the small flow regulating valve reaches +/-1%.
4. The control cabinet is used for acquiring the flow signal of the flowmeter in real time, comparing the flow signal with a set flow signal for logic processing, and then sending an adjusting signal to the small flow regulating valve. The control cabinet can be implemented by referring to the conventional technology.
5. The buffer with the pressure gauge is used for playing a role of wave-shaping and wave-flattening on the pulsating flow output by the conventional metering pump. The capacity of the buffer with the pressure gauge must be more than 10 times of the immediate capacity of a conventional metering pump, a nitrogen inlet and a nitrogen outlet are respectively arranged at the top of the buffer with the pressure gauge, the top of the buffer with the pressure gauge is also provided with the pressure gauge, the pressure gauge is used for detecting the nitrogen pressure in the buffer with the pressure gauge, when the nitrogen pressure in the buffer with the pressure gauge is insufficient, the nitrogen is timely supplemented through a nitrogen flushing tool, the inlet of the fluid material is arranged at the upper end of the side face of the buffer with the pressure gauge, the height of the upper end of the side face is between 60 and 70 percent of the whole height of the buffer with the pressure gauge, and the fluid material flows in from the upper end of the side face of the buffer with the pressure gauge.
6. The throttle valve is used to regulate the flow and pressure in the control return line.
7. The check valve is used for preventing the backflow phenomenon of the fluid material at the outlet end of the conventional metering pump.
8. The safety valve is used to control the pressure in the inlet pipe of the conventional metering pump and prevent overpressure.
9. A conventional metering pump adopts a hydraulic double-diaphragm metering pump, the metering accuracy of the hydraulic double-diaphragm metering pump is required to be higher than +/-1% in a flow range of 10-100%, the pressure or flow at the outlet end of the hydraulic double-diaphragm metering pump is required to be in a negative deviation-free state, and a pressure gauge for monitoring double-diaphragm rupture and a calibration column for fluid material dosage are respectively configured on the hydraulic double-diaphragm metering pump.
10. The fluid material with small flow can be filled into other equipment through the outlet end of the bypass ball valve or the isolation ball valve, the flow of the small flow is less than 0.5L/h, and the flow of the metering pump is controlled to be below 10%.
Under the support of the control device, particularly under the support of the main flow meter, a small flow regulating valve, a buffer with a pressure meter, a control cabinet and other accessories, when in use, the conventional metering pump after stroke regulation is set by the control cabinet pressurizes and injects the fluid material stored in a dosing tank at the flow rate of below 10 percent through a Y-shaped filter, impurities in the fluid material can be removed through the filtering of the Y-shaped filter, the fluid material with the impurities removed enters the flow meter through the outlet end of the conventional metering pump, a check valve, the small flow regulating valve and an isolation ball valve, at the moment, the flow meter displays the current instant flow rate and converts the instant flow rate value into an electric pulse signal of 4-20 mA to be transmitted to the control cabinet, and a PLC system in the control cabinet compares and regulates according to the design data after the control cabinet receives the electric pulse signal to obtain an output digital value, the digital value is amplified, driven, converted by D/A and fed back to the small flow regulating valve, the opening of a valve core of the small flow regulating valve is regulated according to the output control signal so as to meet the given design requirement, the high-precision precise filling of the fluid material is realized, the redundant fluid material at the outlet end of the conventional metering pump circulates back to the chemical feeding tank through a throttle valve, and the check valve and the bypass ball valve respectively prevent the fluid material from flowing back to the outlet end of the conventional metering pump. Obviously, after the control cabinet receives the flow signal of the flowmeter, the control cabinet can output the control signal to the small-flow regulating valve by comparing the received signal with the PLC system design data in the control cabinet and carrying out logic operation.
Although the flow meter, the small flow regulating valve, the buffer with the pressure gauge, the control cabinet and other accessories are all common equipment types, the common equipment types are organically combined by the invention, particularly, the positive effect generated under the control of the control cabinet is very strong pertinence and creativity, and the generated beneficial effect is obvious, so that the conventional metering pump can achieve the control precision of the flow below 10 percent, the accumulated error is reduced, and the aim of accurate metering can be achieved.
Claims (5)
1. A method for realizing small-flow high-precision metering and filling by a conventional metering pump is characterized in that the conventional metering pump (5) is used for measuring a flow meter (10) for conveying fluid materials by a dosing tank (1), a liquid level meter (2) is assembled at one side of the dosing tank (1), the upper end and the lower end of the liquid level meter (2) are connected with the dosing tank (1) through valves, a blow-down valve (3) is assembled at the bottom of the dosing tank (1), the method also comprises a set of control device for realizing small-flow high-precision metering and filling, the control device comprises a Y-shaped filter (4), a safety valve (6), a buffer (7) with a pressure meter, a bypass ball valve (8), an isolation ball valve (9), a flow meter (10), a small-flow regulating valve (11), a check valve (12), a throttle valve (13) and a control cabinet (14), wherein a PLC system and other electric appliance control devices are arranged in, the small flow rate means that the flow rate of the fluid material in the dosing tank (1) conveyed by the conventional metering pump (5) is below 10 percent, and the small flow rate is characterized in that:
in the control device, the inlet end of a Y-shaped filter (4) is connected to the bottom of a dosing tank (1) through a valve, the outlet end of the Y-shaped filter (4) is respectively connected with a conventional metering pump (5) and a safety valve (6) in parallel through a pipeline, the outlet end of the safety valve (6) is respectively connected with a pressure gauge buffer (7) and a throttle valve (13) in series through a pipeline, the outlet end of the conventional metering pump (5) is connected with a check valve (12) through a pipeline after being connected with a pipeline between the pressure gauge buffer (7) and the throttle valve (13), the check valve (12) is connected with a small flow regulating valve (11) through a pipeline, the small flow regulating valve (11) is connected with an isolation ball valve (9), a flow meter (10) and the isolation ball valve (9) in series through a pipeline, a bypass ball valve (8) is connected in parallel on a bypass between an upper isolation, The electric control end of the small flow regulating valve (11) and the electric control end of the flow meter (10) are both controlled in a centralized way by a control cabinet (14);
in the control device, the conventional metering pump (5) is used for conveying the fluid material and controlling the output flow rate of the fluid material through the adjustment of the control cabinet (14), and the output flow rate can be controlled below 10%; the flowmeter (10) is used for detecting the output instantaneous flow and transmitting the flow to the control cabinet (14) in an electric pulse signal of 4-20 mA; the small flow regulating valve (11) is used for receiving a signal from the control cabinet (14) to control the opening degree of the valve and regulate the output flow; the control cabinet (14) is used for acquiring a flow signal of the flowmeter (10) in real time, comparing the flow signal with a set flow signal for logic processing, and then sending an adjusting signal to the small-flow adjusting valve (11); the buffer (7) with the pressure gauge is used for playing a role of wave-shaping and wave-flattening on the pulsating flow output by the conventional metering pump (5); the throttle valve (13) is used for regulating and controlling the flow and the pressure in the return pipeline; the check valve (12) is used for preventing the backflow phenomenon of the fluid material at the outlet end of the conventional metering pump (5); the safety valve (6) is used for controlling the pressure of the inlet pipeline of the conventional metering pump (5) and preventing overpressure;
under the support of the control device, when in use, the conventional metering pump (5) with the stroke adjusted through the control cabinet (14) pressurizes and injects the fluid material stored in the dosing tank (1) through the Y-shaped filter (4) at the flow rate of below 10%, impurities in the fluid material can be removed through the filtering of the Y-shaped filter (4), the fluid material with the impurities removed enters the flow meter (10) through the outlet end of the conventional metering pump (5), the check valve (12), the small flow regulating valve (11) and the isolating ball valve (9), at the moment, the flow meter (10) displays the current instant flow rate and converts the instant flow rate value into an electric pulse signal of 4-20 mA to be transmitted to the control cabinet (14), and after the control cabinet (14) receives the electric pulse signal, a PLC system in the control cabinet (14) carries out comparison adjustment according to design data to obtain an output digital value, the digital value is amplified, driven, converted by D/A and fed back to a small flow regulating valve (11) to output a control signal, the opening of a valve core of the small flow regulating valve (11) is regulated according to the output control signal to meet the given design requirement, the high-precision precise filling of the fluid material is realized, the redundant fluid material at the outlet end of a conventional metering pump (5) is circulated back to a dosing tank (1) through a throttle valve (13), and the check valve (12) and a bypass ball valve (8) respectively prevent the fluid material from flowing back to the outlet end of the conventional metering pump (5);
the capacity of the buffer (7) with the pressure gauge is more than 10 times of the immediate passing capacity of a conventional metering pump (5), the top of the buffer (7) with the pressure gauge is respectively provided with a nitrogen inlet and a nitrogen outlet, the top of the buffer (7) with the pressure gauge is also provided with the pressure gauge, the pressure gauge is used for detecting the nitrogen pressure in the buffer (7) with the pressure gauge, when the nitrogen pressure in the buffer (7) with the pressure gauge is insufficient, a nitrogen injection tool is used for timely supplementing the nitrogen pressure, the inlet of the fluid material is arranged at the upper end of the side surface of the buffer (7) with the pressure gauge, the height of the upper end of the side surface is 60-70% of the whole height of the buffer (7) with the pressure gauge, and the fluid material flows in from the upper end of the side surface of the buffer (7) with the pressure gauge and flows;
the flow meter (10) adopts a turbine flow meter (10), the turbine flow meter (10) converts the flow speed of the fluid material passing through a small flow regulating valve (11) into the rotating speed of a turbine, then converts the rotating speed of the turbine into a 4-20 mA electric pulse signal which is in direct proportion to the flow, the frequency of the electric pulse signal is in direct proportion to the flow of the fluid material to be measured and transmits the electric pulse signal to a PLC system in a control cabinet (14), and the instant flow and the accumulated flow are displayed through integrated LCD indicating meters respectively configured in the control cabinet (14);
the small flow regulating valve (11) adopts a manual stroke regulating mode or an electric stroke regulating mode, the small flow regulating valve (11) needs to be marked with scale indication, a valve positioner is arranged at the valve position of the small flow regulating valve (11), and the valve positioner can change 4-20 mA electric pulse signals output by the control cabinet (14) into air/electric signals for driving the small flow regulating valve (11) to act, so that the small flow regulating valve (11) has corresponding valve opening, and the precision requirement of the valve opening of the small flow regulating valve (11) reaches +/-1%.
2. The method for realizing the high-precision metering filling with the small flow rate by the conventional metering pump as set forth in claim 1, is characterized in that: the conventional metering pump (5) adopts a hydraulic double-diaphragm metering pump, the metering accuracy of the hydraulic double-diaphragm metering pump is higher than +/-1% in a flow range of 10-100%, the pressure or flow at the outlet end of the hydraulic double-diaphragm metering pump is in a negative deviation-free state, and a pressure gauge for monitoring double-diaphragm rupture and a calibration column for fluid material dosage are respectively configured on the hydraulic double-diaphragm metering pump.
3. The method for realizing the high-precision metering filling with the small flow rate by the conventional metering pump as set forth in claim 1, is characterized in that: the liquid level meter (2) is either an on-site liquid level meter or a remote liquid level meter.
4. The method for realizing the high-precision metering filling with the small flow rate by the conventional metering pump as set forth in claim 3, is characterized in that: the on-site liquid level meter adopts a magnetic turning plate liquid level meter or a glass plate liquid level meter.
5. The method for realizing the high-precision metering filling with the small flow rate by the conventional metering pump as set forth in claim 3, is characterized in that: the remote transmission liquid level meter adopts a double-flange liquid level transmitter.
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| CN110410674B true CN110410674B (en) | 2020-10-02 |
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| CN110410674A (en) | 2019-11-05 |
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Denomination of invention: A method for conventional metering pumps to achieve small flow and high-precision metering and filling Granted publication date: 20201002 Pledgee: Industrial and Commercial Bank of China Limited Luoyang Pilot Free Trade Zone Branch Pledgor: LUOYANG LVCHAO ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Registration number: Y2024980006589 |
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