Liquid level control switch device and control circuit

A switching device, liquid level control technology, applied in liquid level control, measuring device, control/regulation system, etc., can solve the problems of electrolytic corrosion of induction electrodes, control circuit error signals, inconvenient electrode cleaning, etc., to avoid error signals , cost reduction, compact structure

Active Publication Date: 2015-01-28
广钢气体(广州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many shortcomings and deficiencies in the liquid level control switch device in the prior art: the power line of the water pump and the power line of the liquid level control switch device need to be set separately, and the two power lines overlap, which increases the cost of use; The control circuit board is separated and packaged, and the section structure is complicated. The liquid level electrode and the control circuit are connected by a long wire, and the electromagnetic interference of the line is likely to cause an error signal to the control circuit; the liquid level electrode is arranged inside the shell of the liquid level control switch device. , it is inconvenient to clean the electrode; continuous sampling current is provided to the liquid level electrode, which is easy to induce electrolytic corrosion of the electrode and affects the measurement accuracy

Method used

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  • Liquid level control switch device and control circuit
  • Liquid level control switch device and control circuit
  • Liquid level control switch device and control circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0038] Embodiment 1 Liquid level control switch device.

[0039] like Figure 1-Figure 3 As shown, a liquid level control switch device of the present invention includes a liquid level sensor, a contactor and a T-shaped joint 5 . The liquid level sensor includes a liquid level electrode 1, a casing 2, a control circuit board 3 and a power lead 4, the casing 2 is a cavity with an upper opening formed by a bottom surface and a side wall, and the control circuit board 3 is sealed and installed in the casing 2 One side of the lower part of the housing 2 is provided with the first installation hole 21, the second installation hole 22 and the third installation hole 23 for installing the liquid level electrode, and the liquid level electrode 1 for sensing the liquid level includes a The first electrode 11 for position sensing, the second electrode 12 for low liquid level sensing and the third electrode 13 for common terminal connection, the first electrode 11, the second electrode ...

Embodiment approach 2

[0049] Embodiment 2 Control Circuit

[0050] like Figure 5 and Image 6 As shown, the present invention provides a control circuit of a liquid level control switch device, the main design points of which are: comprising a first operational amplifier U2A, a first voltage comparator U1A, a second operational amplifier U2B, a second voltage comparator U1B, a micro The processor U3, the transistor Q1 and the step-down power supply U4. In order to clearly describe the principle and connection relationship of the control circuit of the present invention, in this example, the hardware components mainly adopt LM358 operational amplifier chip, LM393 voltage comparator chip and PIC12F509T microprocessor chip. The LM358 operational amplifier chip constitutes the first operational amplifier U2A and the second operational amplifier U2B, the LM393 voltage comparator chip constitutes the first voltage comparator U1A and the second voltage comparator U1B, and the PIC12F509T microprocessor ...

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Abstract

The invention discloses a liquid level control switch device and a control device. The liquid level control switch device comprises a liquid level sensor and a contactor. The liquid level sensor comprises liquid level electrodes, a shell, a control circuit board and a supply lead. The control circuit board is installed in the shell in a sealed mode. Liquid level electrode installing holes are formed in the lower portion of the shell, part of the length parts of the liquid level electrodes are installed in the installing holes in a sealed mode, the liquid level electrodes are elastically connected with the control circuit board, and the control circuit board sends a pulse measuring electrical signal to the liquid level electrodes according to the sampling frequency, and collects liquid level signals sensed by the liquid level electrodes. Anti-interference plastic isolating plates are arranged between the liquid level electrodes. The contactor is installed in the shell, and a coil of the contactor is electrically connected with the control circuit board. The control circuit board controls actuation or disconnection operation of the contactor according to the collected liquid level signals. The length of a connecting cable can be reduced, the structure is simple, the anti-electromagnetic interface capacity is high, the liquid level electrodes are easily cleaned, the electrolysis corrosion of an induction electrode is overcome, and the manufacturing and maintaining cost is low.

Description

technical field [0001] The invention relates to a liquid level control device, in particular to a liquid level control switch device with a compact structure and convenient electrode cleaning, which adopts a pulse signal for liquid level sampling, and a control circuit for controlling the liquid level control switch device. Background technique [0002] The liquid level control switch device is a common detection device in the field of liquid level detection. There are many shortcomings and deficiencies in the liquid level control switch device in the prior art: the power line of the water pump and the power line of the liquid level control switch device need to be set separately, and the two power lines overlap, which increases the cost of use; The control circuit board is separated and packaged, and the section structure is complicated. The liquid level electrode and the control circuit are connected by a long wire, and the electromagnetic interference of the line is likel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D9/12
CPCG01F23/0007G01F23/242G01F23/243G01F23/244G01F23/265G01F23/266G01F23/268G01F23/26
Inventor 樊兆文岳彩培
Owner 广钢气体(广州)有限公司
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