WO2020102958A1 - Système de réglage de pompe de dosage capable de régler le débit avec précision - Google Patents

Système de réglage de pompe de dosage capable de régler le débit avec précision

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Publication number
WO2020102958A1
WO2020102958A1 PCT/CN2018/116314 CN2018116314W WO2020102958A1 WO 2020102958 A1 WO2020102958 A1 WO 2020102958A1 CN 2018116314 W CN2018116314 W CN 2018116314W WO 2020102958 A1 WO2020102958 A1 WO 2020102958A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow
metering pump
flow rate
output
control system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2018/116314
Other languages
English (en)
Chinese (zh)
Inventor
韩正奇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Afchina Corp Co Ltd
Original Assignee
Afchina Corp Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Afchina Corp Co Ltd filed Critical Afchina Corp Co Ltd
Priority to PCT/CN2018/116314 priority Critical patent/WO2020102958A1/fr
Publication of WO2020102958A1 publication Critical patent/WO2020102958A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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

Definitions

  • the invention relates to the technical field of metering equipment, in particular to a metering pump control system capable of accurately controlling flow.
  • the metering pump is a special volume pump that can meet the requirements of various strict technological processes.
  • the flow rate can be adjusted steplessly within the range of 0-100%. It is used to transport liquids (especially corrosive liquids). It is widely used in the quantitative and proportional dosing of fluids in petroleum, chemical, water treatment, food, pharmaceutical, environmental protection, medical equipment and other industries (referred to as fluid constant dosing), and has become the heart and engine of the process industry.
  • the first one is to adjust the flow of liquid by manually rotating the flow adjustment handle.
  • the second method is to adjust the flow rate of the metering pump by adjusting the frequency converter.
  • the metering pump is a positive displacement pump, and the flow rate fluctuates in a sinusoidal curve, the accurate flow rate output by the metering pump cannot be obtained in real time.
  • the above two flow adjustment methods have certain blindness, which greatly reduces the accuracy of the metering pump.
  • the traditional control method has a long operation time, low flow control accuracy, and a large cumulative error, which cannot meet the process requirements.
  • the present invention proposes a metering pump control system that can accurately control the flow rate.
  • the flow control system has high precision and high efficiency, and can be widely used in the field that requires precise and rapid control of the metering pump flow rate. .
  • the metering pump flow control system proposed by the present invention includes:
  • Buffer used to clip the smooth wave to the pulsating flow output by the metering pump
  • the controller is used to collect flow signals in real time and process the flow signals, compare the set flow and actual flow, and control the output of the inverter through a software algorithm;
  • the frequency converter controls the speed of the metering pump by receiving the speed signal output by the controller, which has achieved the purpose of controlling the fluid flow;
  • the buffer described in the present invention mainly plays the role of physical filtering.
  • the capacity of the buffer tank must be more than 10 times the capacity of the metering pump to obtain a better filtering effect.
  • the nitrogen inlet, outlet and a gas pressure gauge are installed on the top of the buffer tank, and the liquid material inlet is installed on the side of the buffer tank, the height is 60% -70% Left and right, the outlet is installed at the bottom of the buffer.
  • Fluid material flows in through the upper part of the buffer and flows out at the bottom.
  • the pressure sensor installed on the top of the buffer tank is used to detect the nitrogen pressure in the buffer tank. When the nitrogen pressure in the tank is insufficient, the nitrogen is supplied through the nitrogen input valve. When the nitrogen pressure in the tank is too high, the nitrogen is released through the nitrogen output valve.
  • the flowmeter of the present invention requires that the length of the upstream straight pipe section of the flowmeter should be at least 5 times the pipe diameter, and the length of the downstream straight pipe section should be at least 3 times the pipe diameter.
  • the process tube and the sensor must be concentric, and the coaxial deviation is not greater than 0.05DN. (DN refers to the diameter of the pipe)
  • the metering pump needs to be turned on first to allow a certain amount of material to be stored in the buffer tank.
  • the height of the material liquid level is higher than the entrance of the buffer tank and does not exceed 80% of the height of the buffer tank.
  • the filtered flow signal is accumulated in the timing period T to obtain the cumulative flow Q.
  • the average instantaneous flow F Q / T is calculated.
  • the accumulated flow Q is cleaned at the same time, and the flow is accumulated in the next timing period.
  • the average instantaneous flow rate F and the set flow rate F s are processed by the PID algorithm to obtain an output value, and this output value is converted into a frequency signal of the frequency converter and output to the frequency converter, and the flow rate of the metering pump is controlled by controlling the speed of the frequency converter.
  • FIG. 1 is a block diagram of the system of the present invention
  • the serial numbers in the system block diagram of Figure 1 are: 1) Metering pump, 2) Frequency converter, 3) Nitrogen input valve, 4) Pressure sensor, 5) Nitrogen output valve, 6) Buffer tank, 7) Nitrogen pipeline, 8) Fluid Material pipeline, 9) flowmeter, 10) controller
  • the invention discloses a metering pump control system capable of accurately controlling the flow rate.
  • the following implementation example will be described in conjunction with FIGS. 1 and 2.
  • the equipment used in this implementation example is as follows:
  • the metering pump uses a plunger metering pump with a working flow of 200L / h and a motor using a 1.1kw variable frequency motor;
  • the buffer as shown in (6) in Figure 1, has a capacity of 2L;
  • the flowmeter uses an electromagnetic flowmeter with a range of 400L / h and an output signal of 4-20ma (4ma corresponds to 0L / h and 20ma corresponds to 400L / h);
  • the controller uses a Siemens S7-300 controller, which is installed with a 4-20ma analog input module and a 4-20ma analog output module.
  • the frequency converter as shown in (2) in Figure 1, uses Siemens MM440 frequency converter with a power of 1.5kw.
  • the height of the liquid level of the material is required to be higher than the inlet of the buffer tank and not exceed 80% of the height of the buffer tank.
  • the flow control scheme in the controller performs software filtering on the flow signal received from the flowmeter.
  • the filtering algorithm can use sliding filtering or average filtering.
  • the filtered flow signal is accumulated in the timing period T to obtain the cumulative flow Q.
  • the accumulated flow Q is cleaned at the same time, and the flow is accumulated in the next timing period.
  • the average instantaneous flow rate F and the set flow rate F s are processed by the PID algorithm to obtain an output value, and this output value is converted into a frequency signal of the frequency converter and output to the frequency converter, and the flow rate of the metering pump is controlled by controlling the speed of the frequency converter.
  • the controller detects and controls the pressure of the buffer tank at the same time. When the controller detects that the nitrogen pressure in the tank is insufficient, the nitrogen is supplemented through the nitrogen input valve. When the nitrogen pressure in the tank is too high, the nitrogen is released through the nitrogen output valve.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Flow Control (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

La présente invention concerne un système de réglage de pompe de dosage capable de régler le débit avec précision. Le système de réglage de débit de pompe de dosage comprend : une pompe de dosage (1), un tampon (6), un débitmètre (9), un dispositif de commande (10) et un convertisseur de fréquence (2). Un débit instantané émis par la pompe de dosage (1) est obtenu avec précision au moyen du filtrage du réservoir tampon (6) et d'un algorithme de filtrage de logiciel. Le dispositif de commande (10) calcule le débit instantané et un débit défini au moyen d'un algorithme PID pour commander une fréquence de sortie du convertisseur de fréquence (2), réglant ainsi le débit de sortie de la pompe de mesure (1). Le présent système de réglage de débit possède une précision élevée et une efficacité élevée, et peut être largement appliqué dans des domaines qui nécessitent un réglage précis et rapide du débit d'une pompe de dosage.
PCT/CN2018/116314 2018-11-20 2018-11-20 Système de réglage de pompe de dosage capable de régler le débit avec précision Ceased WO2020102958A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2018/116314 WO2020102958A1 (fr) 2018-11-20 2018-11-20 Système de réglage de pompe de dosage capable de régler le débit avec précision

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2018/116314 WO2020102958A1 (fr) 2018-11-20 2018-11-20 Système de réglage de pompe de dosage capable de régler le débit avec précision

Publications (1)

Publication Number Publication Date
WO2020102958A1 true WO2020102958A1 (fr) 2020-05-28

Family

ID=70773683

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2018/116314 Ceased WO2020102958A1 (fr) 2018-11-20 2018-11-20 Système de réglage de pompe de dosage capable de régler le débit avec précision

Country Status (1)

Country Link
WO (1) WO2020102958A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2352533A (en) * 1999-07-12 2001-01-31 Danfoss As Method for regulating a delivery variable of a pump
DE202009002155U1 (de) * 2009-02-14 2009-05-14 Gea Diessel Gmbh Vorrichtung zur Durchflussregelung
CN103133320A (zh) * 2013-02-25 2013-06-05 长春工业大学 基于转矩角控制的空压机变转速调节方法
CN104165137A (zh) * 2014-08-06 2014-11-26 浙江工业大学 工业计量泵专用数字变频控制器的便捷标定和自主控制方法
US20170146005A1 (en) * 2015-11-25 2017-05-25 Funai Electric Co., Ltd. Analog Flow Control
CN108167169A (zh) * 2018-03-05 2018-06-15 中芳特纤股份有限公司 一种可精确控制流量的计量泵控制系统
CN208138124U (zh) * 2018-03-05 2018-11-23 中芳特纤股份有限公司 一种可精确控制流量的计量泵控制系统

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2352533A (en) * 1999-07-12 2001-01-31 Danfoss As Method for regulating a delivery variable of a pump
DE202009002155U1 (de) * 2009-02-14 2009-05-14 Gea Diessel Gmbh Vorrichtung zur Durchflussregelung
CN103133320A (zh) * 2013-02-25 2013-06-05 长春工业大学 基于转矩角控制的空压机变转速调节方法
CN104165137A (zh) * 2014-08-06 2014-11-26 浙江工业大学 工业计量泵专用数字变频控制器的便捷标定和自主控制方法
US20170146005A1 (en) * 2015-11-25 2017-05-25 Funai Electric Co., Ltd. Analog Flow Control
CN108167169A (zh) * 2018-03-05 2018-06-15 中芳特纤股份有限公司 一种可精确控制流量的计量泵控制系统
CN208138124U (zh) * 2018-03-05 2018-11-23 中芳特纤股份有限公司 一种可精确控制流量的计量泵控制系统

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