CN202182753U

CN202182753U - Electronic type liquid level controller probe anti-electrolysis circuit

Info

Publication number: CN202182753U
Application number: CN201120208856XU
Authority: CN
Inventors: 胡旭东
Original assignee: SHANGHAI DUANLI INTELLIGENT ELECTRONIC CONTROL TECHNOLOGY CO LTD
Current assignee: SHANGHAI DUANLI INTELLIGENT ELECTRONIC CONTROL TECHNOLOGY CO LTD
Priority date: 2011-06-20
Filing date: 2011-06-20
Publication date: 2012-04-04
Anticipated expiration: 2021-06-20

Abstract

The utility model discloses an electronic type liquid level controller probe anti-electrolysis circuit consisting of a probe conducting circuit, a anti-electrolysis charge converting circuit and a photoelectric isolation converting circuit; wherein the probe conducting circuit comprises a transformer T1 and a liquid level probe M arranged in a water tank, a high-frequency alternating voltage is input in a primary side of the transformer T1, one end of a secondary side of the transformer T1 is connected with the liquid level probe M; the anti-electrolysis charge converting circuit comprises a rectifier bridge stack D, wherein an input end of the rectifier bridge stack D is connected with the other end of the secondary side of the transformer T1 in the probe conducting circuit, an output end of the rectifier bridge stack D is connected with a current-limiting resistor R1; and the photoelectric isolation converting circuit comprises an optical coupler OC1 and a single-chip microcomputer IC, a luminous end of the optical coupler OC1 is connected with an end where a voltage-regulator tube D5 and a filter capacitor C1 are connected in parallel in the anti-electrolysis charge converting circuit, and a receiving end of the optical coupler OC1 is connected with the single-chip microcomputer IC. The electronic type liquid level controller probe anti-electrolysis circuit of the utility model has the advantages of novel structure, accurate detection, safety and reliability.

Description

Electronic type fluid level controller probe is prevented electrolytic circuit

Technical field

The utility model relates to the Level Detection technology, and particularly a kind of electronic type fluid level controller probe is prevented electrolytic circuit.

Background technology

At present, the Level Detection mode of using in the Level Detection industry has only four kinds basically: first kind is float-ball type, but the shortcoming of float-ball type is that reasons such as mechanical structural reason inconvenience assembling and the easy dislocation in contact are arranged, and therefore adopts this mode fewer; Second kind is the capacitance detecting formula, this external interference that is vulnerable to, and precision is the shortcoming of high reason not.The third is that supersonic liquid level detects, and this mode is relatively good, but because cost is tens times of other modes, therefore can not large-scale popularization.The 4th kind is the electronic type probe; Advantages such as relatively simple for structure, easy for installation, no mechanical mechanism, but this traditional liquid level detection circuit also has a very big shortcoming, its principle are that the pin of single-chip microcomputer is through the extended line linking probe; Common port connects the negative pole end of single-chip microcomputer; When probe is visited water, just there is electric current to flow through water tank, makes it single-chip microcomputer leads ends current potential step-down, reach the purpose of Level Detection; All level probes all are metal; That such circuit constitutes even with 316 stainless steel probe through faint electric current (several milliamperes) probe all can very fast electrolytic corrosion (top knot has been expired not only black but also dirty electrolyte, like black sesame paste), knot causes between water and the probe resistance to increase more greatly usually to cause detection to slip up more; Contain a large amount of heavy metal contaminants in the water but also can cause, the liquid probe that particularly contains acid, alkali, salt, sugar attenuates will slowly shortening from January to February.

The utility model content

In order to overcome the defective that above-mentioned prior art exists, the utility model provides a kind of electronic type fluid level controller probe to prevent electrolytic circuit, and circuit structure is novel; Use ingeniously, safe and reliable, can on probe, not decomposite electrolyte; Detect accurately, can not cause the control error.

To achieve these goals, the technical scheme of the utility model is following:

Electronic type fluid level controller probe is prevented electrolytic circuit, isolates change-over circuit by probe transmission line, anti-electrolysis charge conversion circuit and photoelectricity and forms jointly:

Said probe transmission line comprises transformer and the level probe that is arranged in the water tank, the primary side input high-frequency ac voltage of said transformer, and a secondary end connects said level probe;

Said anti-electrolysis charge conversion circuit comprises rectifier bridge heap, two current-limiting resistances that are in series, stabilivolt that is connected in parallel and filter capacitor; The input end of said rectifier bridge heap connects the other end of transformer secondary output in the above-mentioned probe transmission line, and its output terminal connects current-limiting resistance;

Said photoelectricity is isolated change-over circuit and is comprised optocoupler and single-chip microcomputer, and the luminous end of said optocoupler connects the end that stabilivolt and filter capacitor are in parallel in the above-mentioned anti-electrolysis charge conversion circuit, and the receiving end of optocoupler connects said single-chip microcomputer.

Further, said rectifier bridge heap is made up of four diode SP, has four incoming ends; First end connects transformer; Second end connects an end of current-limiting resistance, and the 3rd end inserts the conducting liquid in the water tank through lead, and the 4th end connects optocoupler, a stabilivolt end parallelly connected with filter capacitor.

Further, the luminous end of said optocoupler is provided with light emitting diode, and the input end of said light emitting diode connects current-limiting resistance, and output terminal connects the rectifier bridge heap;

The receiving end of said optocoupler is provided with triode; The collector of said triode and emitter are connected two pin end of single-chip microcomputer respectively; Form a loop; Drag down the current potential of single-chip microcomputer during this loop conducting, single-chip microcomputer is just made corresponding control automatically at the electronegative potential that detects pin, thereby reaches the purpose that detects liquid level.

Splendid attire is water or other conducting liquid in the said water tank, can above-mentioned level probe of conductive communication and rectifier bridge heap.

Further, said level probe selects for use the stainless steel probe for best, combines with above-mentioned anti-electrolytic circuit, makes level probe more be difficult for also can not produced a large amount of heavy metal molecules, not polluted water by electrolysis.

The beneficial effect of the utility model is that circuit structure is novel, uses ingenious, simple and reliable; Probe signals adopts complete isolation method, can not injure personal safety;

Therefore can on probe, not decomposite electrolyte after using this electric installation, more not have electrolyte and tie bigger and bigger, can not cause and detect error or malfunctioningly just not can control error.

Description of drawings

Fig. 1 is the electrical block diagram of the utility model.

Embodiment:

For the creation characteristic, the technological means that make the utility model and reach purpose and be easy to understand and understand, further set forth the utility model below in conjunction with specific embodiment.

Embodiment:

Referring to Fig. 1, electronic type fluid level controller probe is prevented electrolytic circuit, isolates change-over circuit by probe transmission line, anti-electrolysis charge conversion circuit and photoelectricity and forms jointly:

Said probe transmission line comprises transformer T1 and the level probe M that is arranged in the water tank G, the primary side input high-frequency ac voltage of said transformer T1, and a secondary end connects said level probe M;

Said anti-electrolysis charge conversion circuit comprises rectifier bridge heap D, the current-limiting resistance R1 and the R2 that are in series, stabilivolt D5 that is connected in parallel and filter capacitor C1; The input end of said rectifier bridge heap D connects the other end of T1 level of transformer in the above-mentioned probe transmission line, and its output terminal connects current-limiting resistance R1;

Said photoelectricity is isolated change-over circuit and is comprised optocoupler OC1 and single-chip microcomputer IC, and the luminous end of said optocoupler OC1 connects the end that stabilivolt D5 and filter capacitor C1 are in parallel in the above-mentioned anti-electrolysis charge conversion circuit, and the receiving end of optocoupler OC1 connects said single-chip microcomputer IC.

Rectifier bridge heap D is made up of four diode D1, D2, D3, D4 SP; Have four incoming ends; First end connects transformer T1; Second end connects the end of current-limiting resistance R1, and the 3rd end inserts the conducting liquid in the water tank G through lead, and the 4th end connects optocoupler OC1, a stabilivolt D5 end parallelly connected with filter capacitor C1.

The luminous end of optocoupler OC1 is provided with light emitting diode D6, and the input end of said light emitting diode D6 connects current-limiting resistance R2, and output terminal connects rectifier bridge heap D;

The receiving end of optocoupler OC1 is provided with triode Q1, and the collector of said triode Q1 and emitter are connected two pin end of single-chip microcomputer IC respectively, form a loop.Drag down the current potential of single-chip microcomputer IC during this loop conducting, single-chip microcomputer IC just makes corresponding control automatically at the electronegative potential that detects pin, thereby reaches the purpose that detects liquid level.

Splendid attire is water or other conducting liquid in the said water tank G, can above-mentioned level probe M of conductive communication and rectifier bridge heap D.

The principle of work of the utility model is; During conducting liquid in level probe M touches water tank G; High-frequency ac voltage inputs to transformer T1 primary side; T1 utmost point of transformer one terminates on the level probe M in the water tank G, the other end through rectifier bridge heap D1 again after current-limiting resistance R1 current limliting again through thyrector D2 voltage stabilizing to 5V voltage, filter capacitor C1 again through resistance R 2 once more current limliting after optocoupler OC1 luminous end flows back to bridge heap D1 again; Again through water tank G common port, conducting liquid; Common port through level probe M produces the cycling that a half-wave of transformer T1 completion is flowed back in the loop again, and it is different that the selection of positive and negative semiaxis is level probe M and conducting liquid direction of current, and receiving end conducting simultaneously just drags down the current potential of single-chip microcomputer IC after optocoupler OC1 receives voltage signal; Single-chip microcomputer IC just makes corresponding control automatically at the electronegative potential that detects pin, thereby reaches the purpose of sensed water level.

The principle of above-mentioned anti-electrolytic circuit is to be anti-electrolysis charge conversion circuit, when the electric charge on the level probe M also do not come reach the electrolysis probe time electric charge direction change, the conversion electric charge direction of repetition can reach the purpose of not electrolysis like this.

The advantage of the utility model:

(1) clean hygiene: metal probe is the stainless steel probe mostly; Its composition is made up of the iron-carbon alloy and the chromium of carbon content between 0.021%-2.11%; Traditional probe in detecting circuit can cause the blackening of part water quality by the electrolysis probe; Can there be a large amount of noble metal molecules, not polluted water with this device probe water tank when switching on;

Therefore (2) safe and reliable: as with can on level probe, not decompositing electrolyte behind this electric installation, more not have electrolyte and tie bigger and bigger, can not cause and detect error or malfunctioningly just not can control error; This circuit adopts complete isolation method for the signal of probe, can not injure personal safety; Circuit structure is novel, uses ingenious, simple and reliable.

More than show and described the advantage of ultimate principle, principal character and the utility model of the utility model.The technician of the industry should understand; The utility model is not restricted to the described embodiments; The principle of describing in the foregoing description and the instructions that the utility model just is described; The utility model also has various changes and modifications under the prerequisite that does not break away from the utility model spirit and scope, and these variations and improvement all fall in the utility model scope that requires protection.The utility model requires protection domain to be defined by appending claims and equivalent thereof.

Claims

1. the anti-electrolytic circuit of electronic type fluid level controller probe is characterized in that, isolates change-over circuit by probe transmission line, anti-electrolysis charge conversion circuit and photoelectricity and forms jointly:

Said probe transmission line comprises transformer T1 and the level probe M that is arranged in the water tank, the primary side input high-frequency ac voltage of said transformer T1, and a secondary end connects said level probe M;

2. electronic type fluid level controller probe according to claim 1 is prevented electrolytic circuit; It is characterized in that said rectifier bridge heap D is made up of four diode D1, D2, D3, D4 SP, has four incoming ends; First end connects transformer T1; Second end connects the end of current-limiting resistance R1, and the 3rd end inserts the conducting liquid in the water tank G through lead, and the 4th end connects optocoupler OC1, a stabilivolt D5 end parallelly connected with filter capacitor C1.

3. electronic type fluid level controller probe according to claim 1 is prevented electrolytic circuit, it is characterized in that the luminous end of said optocoupler OC1 is provided with light emitting diode D6, and the input end of said light emitting diode D6 connects current-limiting resistance R2, and output terminal connects rectifier bridge heap D;

The receiving end of optocoupler OC1 is provided with triode Q1, and the collector of said triode Q1 and emitter are connected two pin end of single-chip microcomputer IC respectively, form a loop.

4. electronic type fluid level controller probe according to claim 1 is prevented electrolytic circuit, it is characterized in that, splendid attire is water in the said water tank.