CN104199473A - Alternating-current electrode type water level detecting control circuit - Google Patents
Alternating-current electrode type water level detecting control circuit Download PDFInfo
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- CN104199473A CN104199473A CN201410475133.4A CN201410475133A CN104199473A CN 104199473 A CN104199473 A CN 104199473A CN 201410475133 A CN201410475133 A CN 201410475133A CN 104199473 A CN104199473 A CN 104199473A
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Abstract
The invention discloses an alternating-current electrode type water level detecting control circuit which comprises a transformer. A power supply is connected with a power supply indicating circuit, an water level upper limit sensing circuit and a water level lower limit sensing circuit through the transformer. The power supply indicating circuit, the water level upper limit sensing circuit and the water level lower limit sensing circuit are parallelly connected. The power supply indicating circuit indicates whether the power supply supplies power normally or not. The water level upper limit sensing circuit detects whether water level exceeds upper limit or not. The water level lower limit sensing circuit detects whether the water level exceeds the lower limit or not. Alternating current is applied to two ends of the water level upper limit electrode in the water level upper limit sensing circuit. Alternating current is applied to two ends of the water level lower limit electrode in the water level lower limit sensing circuit. The alternating-current electrode type water level detecting control circuit has the advantages that the alternating current is applied to the water level electrodes and not ionized by water, and the electrodes are less prone to corrosion and long in service life; the water level electrodes control the base of a bidirectional thyristor, when the electrodes have no water, a rectifying bridge and a follow-up circuit are not energized, and low power consumption and safety are achieved; the circuit is simple, the water level of a water storage tank can be effectively controlled, and an alarm and action signals can be given when the water level reaches the upper limit/lower limit.
Description
Technical field
The present invention relates to automation field, relate in particular to a kind of ac electrode formula water level detecting and controlling circuit.
Background technology
A lot of water treatment facilities such as the pond of water factory, chemical plant and sewage treatment plant, water tank, water pot, all need static state, dynamic liquid level to various liquid to measure and control, and this just needs level sensor to carry out the detection of water level.What current water level detecting was all that electrode probe flows through is DC current, and its shortcoming is that electrode very easily ionizes oxidation, makes water level detection circuit sensitivity, even whole testing circuit cisco unity malfunction.Have its system to form complicated, cost is higher again, and electrode life is short etc.
Summary of the invention
The object of the invention is to address the above problem, and the water level detecting and controlling circuit that a kind of cost is low, reliability is high, electrode is not oxidizable is proposed, it is ac electrode formula water level detecting and controlling circuit, what so-called ac electrode formula referred to that the electrode two ends of sensed water level add is alternating current, make electrode be difficult for being ionized oxidation, electrode life is long, circuit sensitivity high.
It can send alerting signal higher than upper limit water level with in lower than lower limit water level at water level, and the turn-on and turn-off of controlling respective switch control water inlet and the draining of water storage box, thereby can control its water level, in up/down, restricts water supply between position.
To achieve these goals, the technical solution adopted in the present invention is:
An ac electrode formula water level detecting and controlling circuit, comprises transformer, and power supply is connected with the power supply indicating circuit being connected in parallel to each other, upper limit level sensor circuit and lower limit level sensor circuit through transformer; Described power supply indicating circuit is used to indicate whether normal power supply of power supply; Whether described upper limit level sensor circuit exceeds the upper limit for detection of water level; Whether described lower limit level sensor circuit exceeds lower limit for detection of water level; What the upper limit level electrode two ends in described upper limit level sensor circuit added is alternating current; What the lower limit level electrode two ends in described lower limit level sensor circuit added is alternating current.
One end of the output terminal of described transformation is connected with common port electrode, and what described common port electrode two ends were flow through is alternating current.
Described power supply indicating circuit comprises: the first rectifier being connected with transformer, described the first rectifier output end minus earth, between the output head anode of described the first rectifier and negative pole, be connected with electrochemical capacitor C1, the described electrochemical capacitor C1 series circuit that is connected in parallel, described series circuit is resistance R 1 and the connecting of power light, and on the node between described electrochemical capacitor C1 and resistance R 1, is connected direct voltage source.
Described upper limit level sensor circuit comprises: the second rectifier being connected with transformer by the first bidirectional triode thyristor, described the first bidirectional triode thyristor and common port electrode are connected to the same output terminal of transformer, the trigger pip of described the first bidirectional triode thyristor connects upper limit level electrode, between the output head anode of described the second rectifier and negative pole, be connected with electrochemical capacitor C2, the described electrochemical capacitor C2 series circuit that is connected in parallel, described series circuit is comprised of the first optocoupler being connected in series and resistance R 2, between the emitter of described the first optocoupler and collector, be connected with upper limit water level caution circuit, when sensing water level, upper limit level electrode exceeds in limited time, pilot lamp in upper limit water level caution circuit is bright, play warning function.
Described lower limit level sensor circuit comprises: the 3rd rectifier being connected with transformer by the second bidirectional triode thyristor, described the second bidirectional triode thyristor and common port electrode are connected to the same output terminal of transformer, the trigger pip of described the second bidirectional triode thyristor connects lower limit level electrode, between the output head anode of described the 3rd rectifier and negative pole, be connected with electrochemical capacitor C3, the described electrochemical capacitor C3 series circuit that is connected in parallel, described series circuit is comprised of the second optocoupler being connected in series and resistance R 6, between the emitter of described the second optocoupler and collector, be connected to lower limit water level caution circuit, instantly it is in limited time lower that the potential electrode of restricting water supply senses that water level exceeds, pilot lamp in lower limit water level caution circuit is bright, play warning function.
Described upper limit water level caution circuit comprises: the emitter of described the first optocoupler is connected with ground by resistance R 3, the collector of described the first optocoupler is connected with direct voltage source, described direct voltage source is connected with the input end of relay K 1, the output terminal of described relay K 1 is connected with the collector of triode T1, the described relay series circuit that is connected in parallel, described series circuit is comprised of the upper limit water level indicator light being connected in series and resistance R 5, the grounded emitter of described triode T1, the base stage of described triode T1 is connected with the first optocoupler emitter by resistance R 4, the emitter of described the first optocoupler is connected with node Hlim.
Described upper limit water level caution circuit comprises: the emitter of described the second optocoupler is connected with ground, the collector of described the second optocoupler is connected with direct voltage source by resistance R 7, described direct voltage source is connected with the input end of relay K 2, the output terminal of described relay K 2 is connected with the collector of triode T2, described relay K 2 series circuit that is connected in parallel, described series circuit is comprised of the upper limit water level indicator light being connected in series and resistance R 9, the grounded emitter of described triode T2, the base stage of described triode T2 is connected with the collector of the second optocoupler by resistance R 8, between described resistance R 7 and resistance R 8, be connected with node Llim.
Beneficial effect of the present invention is:
1, to add be alternating current to level electrode, can be by the ionization of water, and electrode is not perishable, long service life.
2, level electrode is controlled the base stage of bidirectional triode thyristor, and when electrode does not have water, rectifier bridge and subsequent conditioning circuit are not charged, safety again low in energy consumption like this.
3, circuit is simple, can effectively control the water level of water storage box, and provides in limited time and report to the police and actuating signal in water level arrival up/down.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is application example of the present invention.
Wherein, 1, transformer; 2, the first rectifier; 3, the second rectifier; 4, the 3rd rectifier; 5, power light; 6, the first optocoupler; 7, the second optocoupler; 8, common port electrode; 9, the first bidirectional triode thyristor; 10, the second bidirectional triode thyristor; 11, upper limit level electrode; 12, lower limit level electrode; 13, upper limit water level caution lamp; 14, lower limit water level caution lamp; 15, the water level upper limit; 16, water level lower limit.
Embodiment
In order better to understand technical scheme of the present invention, below in conjunction with accompanying drawing, the present invention will be further described.
An ac electrode formula water level detecting and controlling circuit, is characterized in that, comprises transformer 1, and power supply is connected with the power supply indicating circuit being connected in parallel to each other, upper limit level sensor circuit and lower limit level sensor circuit through transformer; Described power supply indicating circuit is used to indicate whether normal power supply of power supply; Whether described upper limit level sensor circuit exceeds the upper limit for detection of water level; Whether described lower limit level sensor circuit exceeds lower limit for detection of water level; What the upper limit level electrode two ends in described upper limit level sensor circuit added is alternating current; What the lower limit level electrode two ends in described lower limit level sensor circuit added is alternating current.
One end of the output terminal of described transformation is connected with common port electrode 8; What described common port electrode two ends were flow through is alternating current.
Described power supply indicating circuit comprises: the first rectifier 2 being connected with transformer, described the first rectifier 2 negative pole of output end ground connection, between the output head anode of described the first rectifier 2 and negative pole, be connected with electrochemical capacitor C1, the described electrochemical capacitor C1 series circuit that is connected in parallel, described series circuit is resistance R 1 and the connecting of power light 5.The input of rectifier bridge connects the output of transformer, the output of rectifier bridge is in parallel with electrochemical capacitor and pilot lamp, this circuit is transformed into direct current for subsequent conditioning circuit by the alternating current of transformer output, the pilot lamp of powering when normal is bright, on the node between described electrochemical capacitor C1 and resistance R 1, is connected direct voltage source.
Described upper limit level sensor circuit comprises: the second rectifier 3 being connected with transformer by the first bidirectional triode thyristor 9, described the first bidirectional triode thyristor 9 and common port electrode 8 are connected to the same output terminal of transformer, the trigger pip of described the first bidirectional triode thyristor 9 connects upper limit level electrode 11, between the output head anode of described the second rectifier 3 and negative pole, be connected with electrochemical capacitor C2, the described electrochemical capacitor C2 series circuit that is connected in parallel, described series circuit is comprised of with resistance R 2 the first optocoupler 6 being connected in series, the emitter of described the first optocoupler 6 is connected with ground by resistance R 3, the collector of described the first optocoupler 6 is connected with direct voltage source, described direct voltage source is connected with the input end of relay K 1, the output terminal of described relay K 1 is connected with the collector of triode T1, described relay K 1 series circuit that is connected in parallel, described series circuit is comprised of with resistance R 5 upper limit water level indicator light 13 being connected in series, the grounded emitter of described triode T1, the base stage of described triode T1 is connected with the first optocoupler 6 emitters by resistance R 4, the emitter of described the first optocoupler 6 is connected with node Hlim.
The output of transformer is input to rectifier through the first bidirectional triode thyristor, and the trigger pip of the first bidirectional triode thyristor connects level electrode, after the output-parallel electrochemical capacitor filtering of rectifier, connects the first optocoupler input end.When level electrode anhydrous (namely water level is lower than upper line position), the first bidirectional triode thyristor Triggerless is in off state, and upper limit sensing circuit no signal is exported, and node Hlim is low level, drives triode to turn-off, and relay is failure to actuate.When having water, triggers level electrode the first bidirectional triode thyristor, now the first bidirectional triode thyristor conducting, and the output of the first optocoupler is connected with resistance R 3 and is then accessed power supply with between ground, and node Hlim is high level, and drives triode T1 conducting by current-limiting resistance; The actuating of relay like this, the bright alerting signal of sending of upper limit water level indicator light.This is to show that water level is to reaching the standard grade.
Described lower limit level sensor circuit comprises: the 3rd rectifier 4 being connected with transformer 1 by the second bidirectional triode thyristor 10, described the second bidirectional triode thyristor 10 and common port electrode 8 are connected to the same output terminal of transformer 1, the trigger pip of described the second bidirectional triode thyristor 10 connects lower limit level electrode 12, between the output head anode of described the 3rd rectifier 4 and negative pole, be connected with electrochemical capacitor C3, the described electrochemical capacitor C3 series circuit that is connected in parallel, described series circuit is comprised of with resistance R 6 the second optocoupler 7 being connected in series, the emitter of described the second optocoupler 7 is connected with ground, the collector of described the second optocoupler 7 is connected with direct voltage source by resistance R 7, described direct voltage source is connected with the input end of relay K 2, the output terminal of described relay K 2 is connected with the collector of triode T2, described relay K 2 series circuit that is connected in parallel, described series circuit is comprised of with resistance R 9 upper limit water level indicator light 14 being connected in series, the grounded emitter of described triode T2, the base stage of described triode T2 is connected with the collector of the second optocoupler 7 by resistance R 8, between described resistance R 7 and resistance R 8, be connected with node Llim.
When level electrode has water, trigger the first bidirectional triode thyristor, now light the second optocoupler; During the second optocoupler conducting, the base stage of triode T2 is that low level is in off state; When water level is prescribed a time limit lower, when level electrode does not have water, the second not conducting of optocoupler, triode T2 base stage is the conducting of high level triode, the actuating of relay, the bright alerting signal of sending of lower limit water level indicator light.Now show that water level is to lower limit.
Water storage box shown in Fig. 2, is put in upper limit level electrode 11 position of the water level upper limit 15, and lower limit level electrode 12 is put in the position of water level lower limit 16, and common port level electrode 13 is put in the bottommost of water tank.When water level is during lower than lower limit water level, lower limit water level caution lamp is reported to the police, the actuating of relay; When water level arrives water level lower limit but do not arrive on water level, prescribe a time limit, lower limit water level caution lamp alerting signal is removed, and the normal pilot lamp of relay reset water level is bright; When water level arrives on water level, prescribe a time limit, upper limit water level caution lamp is reported to the police, the actuating of relay.
Utilize this present invention, the control circuit that connects water pump at the output terminal of relay, when water level starts intake pump in limited time or stops unwatering pump under lower than water level, when water level stops intake pump in limited time or starts unwatering pump on higher than water level, can effectively control cistern water level and restrict water supply between position in up/down.
Although above-mentioned, by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (7)
1. an ac electrode formula water level detecting and controlling circuit, is characterized in that, comprises transformer, and power supply is connected with the power supply indicating circuit being connected in parallel to each other, upper limit level sensor circuit and lower limit level sensor circuit through transformer; Described power supply indicating circuit is used to indicate whether normal power supply of power supply; Whether described upper limit level sensor circuit exceeds the upper limit for detection of water level; Whether described lower limit level sensor circuit exceeds lower limit for detection of water level; What the upper limit level electrode two ends in described upper limit level sensor circuit added is alternating current; What the lower limit level electrode two ends in described lower limit level sensor circuit added is alternating current.
2. a kind of ac electrode formula water level detecting and controlling circuit as claimed in claim 1, is characterized in that, one end of the output terminal of described transformation is connected with common port electrode, and what described common port electrode two ends were flow through is alternating current.
3. a kind of ac electrode formula water level detecting and controlling circuit as claimed in claim 1 or 2, it is characterized in that, described power supply indicating circuit comprises: the first rectifier being connected with transformer, described the first rectifier output end minus earth, between the output head anode of described the first rectifier and negative pole, be connected with electrochemical capacitor C1, the described electrochemical capacitor C1 series circuit that is connected in parallel, described series circuit is resistance R 1 and the connecting of power light, and on the node between described electrochemical capacitor C1 and resistance R 1, is connected direct voltage source.
4. a kind of ac electrode formula water level detecting and controlling circuit as claimed in claim 2, it is characterized in that, described upper limit level sensor circuit comprises: the second rectifier being connected with transformer by the first bidirectional triode thyristor, described the first bidirectional triode thyristor and common port electrode are connected to the same output terminal of transformer, the trigger pip of described the first bidirectional triode thyristor connects upper limit level electrode, between the output head anode of described the second rectifier and negative pole, be connected with electrochemical capacitor C2, the described electrochemical capacitor C2 series circuit that is connected in parallel, described series circuit is comprised of the first optocoupler being connected in series and resistance R 2, between the emitter of described the first optocoupler and collector, be connected with upper limit water level caution circuit, when sensing water level, upper limit level electrode exceeds in limited time, pilot lamp in upper limit water level caution circuit is bright, play warning function.
5. a kind of ac electrode formula water level detecting and controlling circuit as claimed in claim 2, it is characterized in that, described lower limit level sensor circuit comprises: the 3rd rectifier being connected with transformer by the second bidirectional triode thyristor, described the second bidirectional triode thyristor and common port electrode are connected to the same output terminal of transformer, the trigger pip of described the second bidirectional triode thyristor connects lower limit level electrode, between the output head anode of described the 3rd rectifier and negative pole, be connected with electrochemical capacitor C3, the described electrochemical capacitor C3 series circuit that is connected in parallel, described series circuit is comprised of the second optocoupler being connected in series and resistance R 6, between the emitter of described the second optocoupler and collector, be connected to lower limit water level caution circuit, instantly it is in limited time lower that the potential electrode of restricting water supply senses that water level exceeds, pilot lamp in lower limit water level caution circuit is bright, play warning function.
6. a kind of ac electrode formula water level detecting and controlling circuit as claimed in claim 4, it is characterized in that, described upper limit water level caution circuit comprises: the emitter of described the first optocoupler is connected with ground by resistance R 3, the collector of described the first optocoupler is connected with direct voltage source, described direct voltage source is connected with the input end of relay K 1, the output terminal of described relay K 1 is connected with the collector of triode T1, the described relay series circuit that is connected in parallel, described series circuit is comprised of the upper limit water level indicator light being connected in series and resistance R 5, the grounded emitter of described triode T1, the base stage of described triode T1 is connected with the first optocoupler emitter by resistance R 4, the emitter of described the first optocoupler is connected with node Hlim.
7. a kind of ac electrode formula water level detecting and controlling circuit as claimed in claim 5, it is characterized in that, described upper limit water level caution circuit comprises: the emitter of described the second optocoupler is connected with ground, the collector of described the second optocoupler is connected with direct voltage source by resistance R 7, described direct voltage source is connected with the input end of relay K 2, the output terminal of described relay K 2 is connected with the collector of triode T2, described relay K 2 series circuit that is connected in parallel, described series circuit is comprised of the upper limit water level indicator light being connected in series and resistance R 9, the grounded emitter of described triode T2, the base stage of described triode T2 is connected with the collector of the second optocoupler by resistance R 8, between described resistance R 7 and resistance R 8, be connected with node Llim.
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| CN201410475133.4A CN104199473B (en) | 2014-09-17 | 2014-09-17 | Alternating-current electrode type water level detecting control circuit |
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| CN201410475133.4A CN104199473B (en) | 2014-09-17 | 2014-09-17 | Alternating-current electrode type water level detecting control circuit |
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| CN104199473A true CN104199473A (en) | 2014-12-10 |
| CN104199473B CN104199473B (en) | 2017-01-11 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107621834A (en) * | 2017-10-27 | 2018-01-23 | 湖南金泰检测检验有限公司 | A kind of fluid level control device of non-electrically conductive liquid |
| CN108955812A (en) * | 2018-04-12 | 2018-12-07 | 无锡市启山林科技有限公司 | Commercial steamer alternation pulsation water level detecting system and its detection method |
| CN108981862A (en) * | 2018-06-14 | 2018-12-11 | 李风花 | A kind of pond water level monitoring device used for aquiculture |
| CN109394020A (en) * | 2018-11-21 | 2019-03-01 | 九阳股份有限公司 | A kind of level testing methods of food processor |
| CN110863979A (en) * | 2019-11-06 | 2020-03-06 | 江苏中车环保设备有限公司 | Polar liquid level drainage control system and control method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3958157A (en) * | 1975-02-12 | 1976-05-18 | The United States Of America As Represented By The Secretary Of The Navy | Oil level detection circuit |
| CN2031120U (en) * | 1988-01-08 | 1989-01-18 | 代富成 | Ac liquid level relay |
| CN2070924U (en) * | 1990-06-23 | 1991-02-06 | 沈永勤 | Ac electrode water level controller |
| JPH11110049A (en) * | 1997-09-29 | 1999-04-23 | Toyo Electric Mfg Co Ltd | Water level controller |
| CN101937239A (en) * | 2010-04-14 | 2011-01-05 | 宁波市镇海华泰电器厂 | Electronic water level controller |
| CN201749373U (en) * | 2010-06-28 | 2011-02-16 | 兰如根 | Water level controller without ionizing electrolysis water |
| CN201837899U (en) * | 2010-05-28 | 2011-05-18 | 宁波市镇海华泰电器厂 | Anti-explosion water level controller with high-power load |
| CN202013519U (en) * | 2011-03-05 | 2011-10-19 | 王跃勇 | Water level electrode controller |
| CN203490546U (en) * | 2013-09-22 | 2014-03-19 | 成都天宇创新科技有限公司 | Automatic water storage device |
| CN204087011U (en) * | 2014-09-17 | 2015-01-07 | 山东大学 | A kind of ac electrode formula water level detecting and controlling circuit |
-
2014
- 2014-09-17 CN CN201410475133.4A patent/CN104199473B/en not_active Expired - Fee Related
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3958157A (en) * | 1975-02-12 | 1976-05-18 | The United States Of America As Represented By The Secretary Of The Navy | Oil level detection circuit |
| CN2031120U (en) * | 1988-01-08 | 1989-01-18 | 代富成 | Ac liquid level relay |
| CN2070924U (en) * | 1990-06-23 | 1991-02-06 | 沈永勤 | Ac electrode water level controller |
| JPH11110049A (en) * | 1997-09-29 | 1999-04-23 | Toyo Electric Mfg Co Ltd | Water level controller |
| CN101937239A (en) * | 2010-04-14 | 2011-01-05 | 宁波市镇海华泰电器厂 | Electronic water level controller |
| CN201837899U (en) * | 2010-05-28 | 2011-05-18 | 宁波市镇海华泰电器厂 | Anti-explosion water level controller with high-power load |
| CN201749373U (en) * | 2010-06-28 | 2011-02-16 | 兰如根 | Water level controller without ionizing electrolysis water |
| CN202013519U (en) * | 2011-03-05 | 2011-10-19 | 王跃勇 | Water level electrode controller |
| CN203490546U (en) * | 2013-09-22 | 2014-03-19 | 成都天宇创新科技有限公司 | Automatic water storage device |
| CN204087011U (en) * | 2014-09-17 | 2015-01-07 | 山东大学 | A kind of ac electrode formula water level detecting and controlling circuit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107621834A (en) * | 2017-10-27 | 2018-01-23 | 湖南金泰检测检验有限公司 | A kind of fluid level control device of non-electrically conductive liquid |
| CN108955812A (en) * | 2018-04-12 | 2018-12-07 | 无锡市启山林科技有限公司 | Commercial steamer alternation pulsation water level detecting system and its detection method |
| CN108981862A (en) * | 2018-06-14 | 2018-12-11 | 李风花 | A kind of pond water level monitoring device used for aquiculture |
| CN109394020A (en) * | 2018-11-21 | 2019-03-01 | 九阳股份有限公司 | A kind of level testing methods of food processor |
| CN110863979A (en) * | 2019-11-06 | 2020-03-06 | 江苏中车环保设备有限公司 | Polar liquid level drainage control system and control method |
| CN110863979B (en) * | 2019-11-06 | 2021-07-09 | 江苏中车环保设备有限公司 | Electrode type liquid level drainage control system and control method |
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Granted publication date: 20170111 Termination date: 20170917 |