Direct liquid level controlling system with single-loop pump

A variable frequency water pump, level control technology, applied in liquid level control, control/regulation system, non-electric variable control and other directions, can solve problems such as increasing project cost and operating cost

Inactive Publication Date: 2003-02-26
天津市科华达科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increased project cost and operating cost

Method used

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  • Direct liquid level controlling system with single-loop pump
  • Direct liquid level controlling system with single-loop pump
  • Direct liquid level controlling system with single-loop pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] One end of the water inlet pipe (10) is connected with the water outlet of the water pump (2), the other end of the water inlet pipe (10) is connected with the airtight container (1), and the water inlet of the water pump (2) is connected with the water storage tank ( 5) connected with each other, the lower end of the airtight container (1) is provided with an output water pipeline (21), and the output water pipeline (21) is connected with the user.

[0032] Take the total length of the airtight container (1) as the container liquid level height (L), the upper part of one side of the airtight container (1) is provided with a container liquid level upper limit display detection point (15), and the container liquid level upper limit display detection point (15) One end is connected to the upper part of one side of the airtight container (1), and the other end of the container liquid level upper limit display detection point (15) is connected to one end of the needle valve ...

Embodiment 2

[0039] One end of the container differential pressure transmitter (3) of the container liquid level detection circuit (17) is connected to the MA end of the barometer (6), and the other end of the container differential pressure transmitter (3) is connected to the container liquid level detection circuit The positive end of the 24V power supply (23) of (17) is connected, and the negative end of the 24V point source (23) of the container liquid level detection circuit (17) is connected with the bar display instrument (6) IN of the container liquid level detection circuit (17). end connected.

[0040] One end of the control liquid level differential pressure transmitter (4) of the control liquid level detection circuit (18) is connected to the MA end of the digital regulator (7), and the control liquid level differential pressure transmitter of the control liquid level detection circuit (18) The other end of the regulator (4) is connected with one end of the 24V power supply (23...

Embodiment 3

[0044] During use, start the opening and closing switch (9) of the opening and closing circuit (20), the container liquid level upper limit display detection point (15) and the container liquid level lower limit display detection point (16) of the container liquid level circuit on the side of the airtight container (1) ) The liquid level situation in the closed container (1) is transmitted to the container liquid level through the pipeline (24) of the upper limit display detection point (15) of the container liquid level and the pipeline (24) of the lower limit display detection point (16) of the container liquid level The container liquid level differential pressure transmitter (3) of the detection circuit (17), the container liquid level differential pressure transmitter (3) converts the pressure signal into a liquid level signal and transmits it to the light column display of the container liquid level detection circuit (17) instrument (6), the light beam display instrument ...

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PUM

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Abstract

The water reservoir, water pump, sealed container and user are contained via pipeline. The liquid level controlling system consists of container level loop, control level loop, container level detecting circuit, control level detecting circuit, information processing control circuit, on-off control circuit and the water pump. Via simple signal conversion, water pump motor rotation speed, instead of regulating valve, is regulated and this has high control sensitivity, less measurement lagging, and high control precision. The present invention can be used widely in water tower, industry boiler water supply, etc.

Description

technical field [0001] The invention relates to a liquid level control system, in particular to a direct liquid level level control system of a single-loop frequency conversion water pump. Background technique [0002] At present, the water supply system at home and abroad is completed by a frequency conversion pump constant pressure control system and a liquid level control system. The general frequency conversion water pump constant pressure control system is composed of a pressure sensor transmitter (to measure the outlet pressure of the water pump), a digital regulator, and a frequency conversion water pump (executive agency) to form a constant pressure control system. The liquid level control system is composed of a differential pressure transmitter (to measure the liquid level length), a digital regulator and a regulating valve to form a liquid level control system. [0003] In terms of control, the water supply system has defects such as measurement hysteresis, low s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D9/00G05D9/12
Inventor 阎华
Owner 天津市科华达科技有限公司
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