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Electrode type digital liquid level controlling device

An electrode-type, digital technology, applied in the direction of liquid level control, non-electric variable control, control/regulation system, etc., can solve the problems of poor anti-interference ability of analog signals, large energy consumption of equipment, poor working stability, etc., and achieve structural Compact, reliable and stable operation

Inactive Publication Date: 2002-03-13
黄武源
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid level control of the pressure tank is also a mechanical strong electric control with contacts, and it is a pressure vessel with large volume, high cost, poor versatility, and inconvenient maintenance
Electronic circuit weak current control, due to the technical use of analog signal amplification and improper selection of materials, poor anti-interference ability of analog signals, poor work stability, so it is replaced by air pressure tank type control
[0005] 3. Frequency conversion liquid level control began to enter the market in the 1990s. The frequency converter has high technical content, stable and reliable operation, wide applicability, and strong versatility, especially for places with high requirements for constant pressure water supply without towers. advantages, but the frequency converter liquid level water supply control equipment, the cost is high, the energy consumption of the equipment is relatively large (the frequency converter's own loss is generally about 8% of the rated load), and the requirements for the skills of the operators and maintenance personnel are relatively high. Maintenance is more difficult

Method used

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  • Electrode type digital liquid level controlling device
  • Electrode type digital liquid level controlling device
  • Electrode type digital liquid level controlling device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to Figure 1 and Figure 4 , the present embodiment includes a power supply circuit 3, the power supply circuit 3 is connected with the shaping circuit 1, the signal isolation analog / digital conversion circuit 5, the central controller 7 and the peripheral control circuit 10, and provides corresponding working power; the shaping circuit 1 is connected with a The external working state detection circuit 4 is connected to a water level detection circuit 2, and the water level detection circuit 2 is connected to a grounded water level sensing line In and another water level sensing line I1, and the grounded water level sensing line In and the water level sensing line I1 is respectively connected with sensor probe electrodes 301, the water level detection circuit 2 receives the sensing current from between the sensor probe electrodes 301, and the external working state detection circuit 4 receives the working state signal I9 of the water pump 70, and is isolated fro...

Embodiment 2

[0029] According to Figure 2 and Figure 5The difference between this embodiment and the previous embodiment is that the shaping circuit 1 is connected with another water level detection circuit 21, and the water level detection circuit 21 is connected with a grounded water level sensing line In and two water level sensing lines I5, I6, The grounded water level sensing line In and the water level sensing lines I5 and I6 are respectively connected with sensor probe electrodes 301 placed in the reservoir 80, and the sensor probe electrodes 301 connected to the grounded water level sensing line In are placed oppositely. At the lowest point, the sensor probe electrode 301 connected to the water level sensing line I6 is placed at the relatively highest point, and the water pump 70 draws water from the reservoir 80; the external working state detection circuit 4 receives the working state signal I9 of the water pump 70, that is, the water pump 70 Open and close state, also receive w...

Embodiment 3

[0034] according to image 3 and Figure 6 , the present embodiment includes a power supply circuit 3, the power supply circuit 3 is connected with the shaping circuit 1, the signal isolation analog / digital conversion circuit 5, the central controller 7 and the peripheral control circuit 10, and provides corresponding working power; the shaping circuit 1 is connected with a The external working state detection circuit 4 is connected to a water level detection circuit 2, the water level detection circuit 2 is connected to a grounded water level sensing line In and four water level sensing lines I1, I2, I3, I4, and the grounded water level sensing line In The sensor probe electrodes 301 are respectively connected to the water level sensing lines I1, I2, I3 and I4, the water level detection circuit 2 receives the sensing current from between the sensor probe electrodes 301, and the external working state detection circuit 4 receives the working state of the water pump 70 Signal I...

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Abstract

The present invention discloses a kind of electrode type digital liquid level controlling device. Weak pulse signal detected by the sensor probe is treated before it is fed to digital pulse signal inA / D converter and used for logic operation and judgment in central controller to complete intelligent control. The present invention has stable running, low operation cost, strong antijamming capacity and low power consumption, and may be used in the intelligent control of various water supply and draining system.

Description

[technical field] [0001] The invention relates to an automatic controller, in particular to an electrode type liquid level numerical control device. [Background technique] [0002] There are many existing liquid level control methods and methods in our country, and the ones still in use in the market are: [0003] 1. Float-type and reed switch-type liquid level control devices in the 1950s and 1960s are all mechanical strong current controls with contacts. The products are of low grade, short service life, unstable work, and poor reliability. The cost of dry reed switch is high, and maintenance is extremely inconvenient. [0004] 2. At the end of the 1980s, the pressure tank type liquid level strong current control and the weak current control of the electronic circuit appeared. The liquid level control of the pressure tank is also a mechanical strong electric control with contacts, and it is a pressure vessel with large volume, high cost, poor versatility, and inconvenien...

Claims

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Application Information

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IPC IPC(8): G05D9/12
Inventor 黄武源
Owner 黄武源
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