CN103023472A - Special liquid level relay for lithium bromide solution - Google Patents
Special liquid level relay for lithium bromide solution Download PDFInfo
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- CN103023472A CN103023472A CN2012105294784A CN201210529478A CN103023472A CN 103023472 A CN103023472 A CN 103023472A CN 2012105294784 A CN2012105294784 A CN 2012105294784A CN 201210529478 A CN201210529478 A CN 201210529478A CN 103023472 A CN103023472 A CN 103023472A
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Abstract
The invention discloses a special liquid level relay for a lithium bromide solution. The relay comprises a voltage comparison unit, a power supply unit, a liquid level detection unit, a signal output unit based on an optocoupler relay and an output indicating unit, wherein the liquid level detection unit is used for acquiring voltage signals which are located between a lithium bromide unit casing and an electrode bar in the lithium bromide unit casing and is output when passing a channel formed by the lithium bromide solution, and the voltage comparison unit is used for comparing voltage signals acquired by the liquid level detection unit with reference voltage signals. When the voltage value of voltage signals is lower than that of reference voltage signals, a high-level signal is output and an output end of the signal output unit based on the optocoupler relay is connected. When the voltage value of voltage signals is higher than that of reference voltage signals, a low-level signal is output and the output end of the signal output unit based on the optocoupler relay is disconnected. The non-contact liquid level relay is formed. Therefore, the service life of the liquid level relay which is applied to the detection of the lithium bromide solution is improved.
Description
Technical field
The present invention relates to a kind of liquid-level auto-control device, relate in particular to the special-purpose liquid level relay of a kind of lithium-bromide solution.
Background technology
Although the method for at present liquid level detection is a lot, that often uses has two kinds: the one, and float switch, the 2nd, adopt electrode bar+fluid level controller.If float switch acts frequently, often easily damage, thus very violent and frequently in the situation at the water level liquid fluctuating, use the reliability ratio of electrode bar+fluid level controller to use float switch to want high.The control of lithium bromide unit generator liquid level of solution just belongs to this occasion, according to on-the-spot actual count, annual lithium bromide unit generator liquid fluctuating number of times is more than 100,000 times, so generally speaking, electrode bar+fluid level controller mode is adopted in the control of lithium bromide unit generator liquid level of solution.
The fluid level controller that some sale are also arranged in the market, the more representational 61F-GP-N that Europe dragoness company is arranged, the RM4LG01M of Schneider company etc.The fluid level controller of these commercially available types all is conducting or the disconnection that goes out liquid level by oneself circuit inductance, then exports by relay contact.As you know, the output contact of relay has the life-span, so the fluid level controller of these commercially available types damages owing to the damage of relay output contact.Consulted the 61F-GP-N liquid level relay of Europe dragoness company, its life-span is about 100,000 times.That is to say, if use the 61F-GP-N liquid level relay of OMRON to be used for the control of lithium bromide unit generator liquid level of solution, only be 1 year designed life.
Summary of the invention
The object of the present invention is to provide the special-purpose liquid level relay of a kind of lithium-bromide solution, to improve the useful life of liquid level relay when being applied to the lithium-bromide solution inspection.
For achieving the above object, the invention provides the special-purpose liquid level relay of a kind of lithium-bromide solution, comprising:
The liquid level detecting unit is used for obtaining the voltage signal of exporting between lithium bromide unit casing and the position electrode bar in the inner when forming path by lithium-bromide solution;
Voltage comparison unit, the voltage signal and the reference voltage signal that are used for described liquid level detecting unit is obtained compare; When the magnitude of voltage of described voltage signal is lower than the magnitude of voltage of described reference voltage signal, export a high level signal; When the magnitude of voltage of described voltage signal is higher than the magnitude of voltage of described reference voltage signal, export a low level signal;
Based on the signal output unit of light coupling relay, the conducting when receiving the high level signal of described voltage comparison unit output of its output, and when receiving the high level signal of described voltage comparison unit output, disconnect;
Power subsystem is used to power devices.
The special-purpose liquid level relay of lithium-bromide solution of the present invention comprises voltage comparison unit, power subsystem, liquid level detecting unit, based on signal output unit and the output indicating member of light coupling relay.Wherein, the liquid level detecting unit is used for obtaining the voltage signal of exporting between lithium bromide unit casing and the position electrode bar in the inner when forming path by lithium-bromide solution; Voltage signal and reference voltage signal that voltage comparison unit then obtains the liquid level detecting unit compare; When the magnitude of voltage of voltage signal is lower than the magnitude of voltage of reference voltage signal, exports a high level signal and make output conducting based on the signal output unit of light coupling relay; When the magnitude of voltage of voltage signal is higher than the magnitude of voltage of reference voltage signal, exporting a low level signal disconnects the output based on the signal output unit of light coupling relay, thereby consisted of a kind of contactless liquid level relay, therefore, greatly improved the useful life of liquid level relay when being applied to the lithium-bromide solution inspection.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the special-purpose liquid level relay of lithium-bromide solution of the present invention;
Fig. 2 is the circuit theory diagrams of the special-purpose liquid level relay of lithium-bromide solution of the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail:
With reference to shown in Figure 1, the special-purpose liquid level relay of the lithium-bromide solution of the present embodiment comprises voltage comparison unit 1, power subsystem 2, liquid level detecting unit 3, based on signal output unit 4 and the output indicating member 5 of light coupling relay.Wherein, liquid level detecting unit 3 is used for obtaining the voltage signal of exporting between lithium bromide unit casing and the position electrode bar in the inner when forming path by lithium-bromide solution.Voltage signal and reference voltage signal that voltage comparison unit 1 is used for liquid level detecting unit 3 is obtained compare; When the magnitude of voltage of voltage signal is lower than the magnitude of voltage of reference voltage signal, export a high level signal; When the magnitude of voltage of voltage signal is higher than the magnitude of voltage of reference voltage signal, export a low level signal.Based on the conducting when the high level signal of the output that receives voltage comparison unit 1 of the output of the signal output unit 4 of light coupling relay, and when the high level signal of the output that receives voltage comparison unit 1, disconnect.Power subsystem 2 is used to power devices.It is used for sending pilot light output indicating member 5 when the output conducting of signal output unit.
In conjunction with shown in Figure 2, liquid level detecting unit 3 is two-way: the first liquid level detecting unit and the second liquid level detecting unit.Wherein:
The first liquid level detecting unit comprises resistance R 3, diode D2, capacitor C 6, capacitor C 5 and resistance R 8 etc.One termination power unit of resistance R 3, the other end of resistance R 3 links to each other with input and the common ground end of the first electrode bar, diode D2 respectively, the output of diode D2 links to each other with an end of capacitor C 6, positive pole and resistance R 8 one ends of capacitor C 5 respectively, the negative pole of the other end of capacitor C 6, capacitor C 5 and resistance R 8 another termination common ground ends; Capacitor C 5 is by resistance R 8 discharges.The second liquid level detecting unit comprises resistance R 4, diode D3, capacitor C 10, capacitor C 9 and resistance R 18 etc.One termination power unit of resistance R 4, the other end of resistance R 4 links to each other with input and the common ground end of the second electrode bar, diode D3 respectively, the output of diode D3 links to each other with an end of capacitor C 10, positive pole and resistance R 18 1 ends of capacitor C 9 respectively, the negative pole of the other end of capacitor C 10, capacitor C 9 and resistance R 18 another termination common ground ends; Capacitor C 9 is by resistance R 18 discharges.In addition, the first liquid level detecting unit also comprises the first piezo-resistance ZNR1, and resistance R 3 connects the common ground end by the first piezo-resistance ZNR1.The second liquid level detecting unit also comprises the second piezo-resistance ZNR2, and resistance R 4 connects the common ground end by the first piezo-resistance ZNR1.The first piezo-resistance ZNR1 and the second piezo-resistance ZNR2 can the absorbing circuit conducting moment surge that produces.
In conjunction with shown in Figure 2, voltage comparison unit 1 is two-way: the first voltage reference unit and second voltage reference cell, wherein:
The first voltage reference unit comprises resistance R 6, resistance R 7, resistance R 10, resistance R 11, capacitor C 4 and capacitor C 7.One termination power unit of resistance R 7, the other end of resistance R 7 is respectively the 3rd pin of the voltage comparator of LM393D with model, one end of resistance R 11, one end of capacitor C 7 and an end of resistance R 10 link to each other, another termination common ground end of the other end of resistance R 11 and capacitor C 7, the other end of resistance R 10 links to each other with the 1st pin of voltage comparator, the 2nd pin of voltage comparator links to each other with the output of diode D2 by resistance R 6, the 2nd pin of voltage comparator connects the common ground end by capacitor C 4, the 4th pin of voltage comparator connects the common ground end, and the 8th pin of voltage comparator connects power subsystem.The second voltage reference cell comprises resistance R 16, resistance R 17, resistance R 20, resistance R 21, capacitor C 8 and capacitor C 11.One termination power unit of resistance R 17, the other end of resistance R 17 links to each other with the 5th pin of voltage comparator, an end of resistance R 21, an end of capacitor C 11 and an end of resistance R 20 respectively, another termination common ground end of the other end of resistance R 21 and capacitor C 11, the other end of resistance R 20 links to each other with the 7th pin of voltage comparator, the 6th pin of voltage comparator links to each other with the output of diode D3 by resistance R 16, and the 6th pin of voltage comparator connects the common ground end by capacitor C 8.
In conjunction with shown in Figure 2, signal output unit 4 is two-way: first signal output unit and secondary signal output unit, wherein:
The first signal output unit comprises that resistance R 1, resistance R 5, resistance R 9, resistance R 12, the first triode N1 and model are the first light coupling relay of AQY210EH.The 1st pin of the first light coupling relay connects power subsystem by resistance R 1, the 2nd pin of the first light coupling relay links to each other with the collector electrode of the first triode N1, the emitter of the first triode N1 connects the common ground end, link to each other by resistance R 12 between the emitter of the first triode N1 and its base stage, the base stage of the first triode N1 connects power subsystem by resistance R 9 and resistance R 5 successively, the base stage of the first triode N1 links to each other with the 1st pin of voltage comparator by resistance R 9, the 3rd pin of the first light coupling relay connects the common ground end, and the 4th pin of the first light coupling relay is as the output of this first signal output unit.The secondary signal output unit comprises that resistance R 13, resistance R 15, resistance R 19, resistance R 22, the second triode N2 and model are the second light coupling relay of AQY210EH.The 1st pin of the second light coupling relay connects power subsystem by resistance R 13, the 2nd pin of the second light coupling relay links to each other with the collector electrode of the second triode N2, the emitter of the second triode N2 connects the common ground end, link to each other by resistance R 22 between the emitter of the second triode N2 and its base stage, the base stage of the second triode N2 connects power subsystem by resistance R 19 and resistance R 15 successively, the base stage of the second triode N2 links to each other with the 7th pin of voltage comparator by resistance R 19, the 3rd pin of the second light coupling relay connects the common ground end, and the 4th pin of the second light coupling relay is as the output of this secondary signal output unit.
In conjunction with shown in Figure 2, output indicating member 5 is two-way: the first output indicating member and the second output indicating member, wherein:
The first output indicating member comprises resistance R 2 and the first light-emitting diode DS1, and the input of the first light-emitting diode DS1 connects power subsystem by resistance R 2, and the output of the first light-emitting diode DS1 links to each other with the collector electrode of the first triode N1.The second output indicating member comprises resistance R 14 and the second light-emitting diode DS2, and the input of the second light-emitting diode DS2 connects power subsystem by resistance R 14, and the output of the second light-emitting diode DS2 links to each other with the collector electrode of the second triode N2.
In the special-purpose liquid level relay of the lithium-bromide solution of the present embodiment, when not having solution (being lithium-bromide solution) between the first electrode bar and the lithium bromide unit casing, resistance between the first electrode bar and the lithium bromide unit casing is infinitely great, voltage is via resistance R 3, diode D2, resistance R 6 is received the 2nd pin of voltage comparator, and the voltage of the 3rd pin of voltage comparator is by resistance R 7 and resistance R 11 dividing potential drop gained, at this moment the height of its 3rd pin of voltage ratio of the 2nd pin of voltage comparator.The 1st pin output low level of voltage comparator, the first triode N1 cut-off, the first Light-Emitting Diode DS1 does not work, and the first light coupling relay U1 is failure to actuate, and its output disconnects.When liquid level rose between the first electrode bar and the lithium bromide unit casing, because lithium-bromide solution resistance is very little, after resistance R 3 dividing potential drops, voltage was very low.This moment because diode D2 left side voltage is low, capacitor C 5 is slowly discharged by resistance R 8, the voltage of the 2nd pin of voltage comparator slowly reduces, when its 3rd pin voltage of voltage ratio of its 2nd pin is hanged down, the 1st pin output high level of voltage comparator, the first triode N1 conducting, the first Light-Emitting Diode DS1 is luminous, the first light coupling relay U1 action, its output conducting.The manner of execution on another road is identical.Therefore the capacitor C 5 of liquid level detecting unit 3 and capacitor C 9 also have the circuit turn-on time-lag action except filter action is arranged, can effectively prevent the circuit frequent movement that causes because the lithium-bromide solution liquid level fluctuates back and forth.
Above embodiment is described preferred implementation of the present invention; be not that scope of the present invention is limited; design under the prerequisite of spirit not breaking away from the present invention; various distortion and improvement that the common engineers and technicians in this area make technical scheme of the present invention all should fall in the definite protection range of claims of the present invention.
Claims (7)
1. the special-purpose liquid level relay of lithium-bromide solution is characterized in that, comprising:
The liquid level detecting unit is used for obtaining the voltage signal of exporting between lithium bromide unit casing and the position electrode bar in the inner when forming path by lithium-bromide solution;
Voltage comparison unit, the voltage signal and the reference voltage signal that are used for described liquid level detecting unit is obtained compare; When the magnitude of voltage of described voltage signal is lower than the magnitude of voltage of described reference voltage signal, export a high level signal; When the magnitude of voltage of described voltage signal is higher than the magnitude of voltage of described reference voltage signal, export a low level signal;
Based on the signal output unit of light coupling relay, the conducting when receiving the high level signal of described voltage comparison unit output of its output, and when receiving the high level signal of described voltage comparison unit output, disconnect;
Power subsystem is used to power devices.
2. the special-purpose liquid level relay of lithium-bromide solution according to claim 1 is characterized in that, also comprises:
The output indicating member, it is used for sending pilot light when the output conducting of described signal output unit.
3. the special-purpose liquid level relay of lithium-bromide solution according to claim 2 is characterized in that, described liquid level detecting unit is two-way:
The first liquid level detecting unit, comprise resistance R 3, diode D2, capacitor C 6, capacitor C 5 and resistance R 8, one termination power unit of resistance R 3, the other end of resistance R 3 links to each other with input and the common ground end of the first electrode bar, diode D2 respectively, the output of diode D2 links to each other with an end of capacitor C 6, positive pole and resistance R 8 one ends of capacitor C 5 respectively, the negative pole of the other end of capacitor C 6, capacitor C 5 and resistance R 8 another termination common ground ends; Capacitor C 5 is by resistance R 8 discharges;
The second liquid level detecting unit, comprise resistance R 4, diode D3, capacitor C 10, capacitor C 9 and resistance R 18, one termination power unit of resistance R 4, the other end of resistance R 4 links to each other with input and the common ground end of the second electrode bar, diode D3 respectively, the output of diode D3 links to each other with an end of capacitor C 10, positive pole and resistance R 18 1 ends of capacitor C 9 respectively, the negative pole of the other end of capacitor C 10, capacitor C 9 and resistance R 18 another termination common ground ends; Capacitor C 9 is by resistance R 18 discharges.
4. the special-purpose liquid level relay of lithium-bromide solution according to claim 3 is characterized in that, described the first liquid level detecting unit also comprises the first piezo-resistance (ZNR1), and described resistance R 3 connects the common ground end by the first piezo-resistance (ZNR1); Described the second liquid level detecting unit also comprises the second piezo-resistance (ZNR2), and described resistance R 4 connects the common ground end by the first piezo-resistance (ZNR1).
5. the special-purpose liquid level relay of lithium-bromide solution according to claim 4 is characterized in that, described voltage comparison unit is two-way:
The first voltage reference unit comprises resistance R 6, resistance R 7, resistance R 10, resistance R 11, capacitor C 4 and capacitor C 7; One termination power unit of resistance R 7, the other end of resistance R 7 is respectively the 3rd pin of the voltage comparator of LM393D with model, one end of resistance R 11, one end of capacitor C 7 and an end of resistance R 10 link to each other, another termination common ground end of the other end of resistance R 11 and capacitor C 7, the other end of resistance R 10 links to each other with the 1st pin of described voltage comparator, the 2nd pin of described voltage comparator links to each other with the output of described diode D2 by resistance R 6, the 2nd pin of described voltage comparator connects the common ground end by capacitor C 4, the 4th pin of described voltage comparator connects the common ground end, and the 8th pin of described voltage comparator connects power subsystem;
The second voltage reference cell comprises resistance R 16, resistance R 17, resistance R 20, resistance R 21, capacitor C 8 and capacitor C 11; One termination power unit of resistance R 17, the other end of resistance R 17 links to each other with the 5th pin of described voltage comparator, an end of resistance R 21, an end of capacitor C 11 and an end of resistance R 20 respectively, another termination common ground end of the other end of resistance R 21 and capacitor C 11, the other end of resistance R 20 links to each other with the 7th pin of described voltage comparator, the 6th pin of described voltage comparator links to each other with the output of described diode D3 by resistance R 16, and the 6th pin of described voltage comparator connects the common ground end by capacitor C 8.
6. the special-purpose liquid level relay of lithium-bromide solution according to claim 5 is characterized in that, described signal output unit is two-way:
The first signal output unit, comprise resistance R 1, resistance R 5, resistance R 9, resistance R 12, the first triode (N1) and model are the first light coupling relay of AQY210EH, the 1st pin of described the first light coupling relay connects power subsystem by resistance R 1, the 2nd pin of described the first light coupling relay links to each other with the collector electrode of the first triode (N1), the emitter of the first triode (N1) connects the common ground end, link to each other by resistance R 12 between the emitter of the first triode (N1) and its base stage, the base stage of the first triode (N1) connects power subsystem by resistance R 9 and resistance R 5 successively, the base stage of the first triode (N1) links to each other with the 1st pin of described voltage comparator by resistance R 9, the 3rd pin of described the first light coupling relay connects the common ground end, and the 4th pin of described the first light coupling relay is as the output of this first signal output unit;
The secondary signal output unit, comprise resistance R 13, resistance R 15, resistance R 19, resistance R 22, the second triode (N2) and model are the second light coupling relay of AQY210EH, the 1st pin of described the second light coupling relay connects power subsystem by resistance R 13, the 2nd pin of described the second light coupling relay links to each other with the collector electrode of the second triode (N2), the emitter of the second triode (N2) connects the common ground end, link to each other by resistance R 22 between the emitter of the second triode (N2) and its base stage, the base stage of the second triode (N2) connects power subsystem by resistance R 19 and resistance R 15 successively, the base stage of the second triode (N2) links to each other with the 7th pin of described voltage comparator by resistance R 19, the 3rd pin of described the second light coupling relay connects the common ground end, and the 4th pin of described the second light coupling relay is as the output of this secondary signal output unit.
7. the special-purpose liquid level relay of lithium-bromide solution according to claim 6 is characterized in that, described output indicating member is two-way:
The first output indicating member, it comprises resistance R 2 and the first light-emitting diode (DS1), the input of the first light-emitting diode (DS1) connects power subsystem by resistance R 2, and the output of the first light-emitting diode (DS1) links to each other with the collector electrode of described the first triode (N1);
The second output indicating member, it comprises resistance R 14 and the second light-emitting diode (DS2), the input of the second light-emitting diode (DS2) connects power subsystem by resistance R 14, and the output of the second light-emitting diode (DS2) links to each other with the collector electrode of described the second triode (N2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105294784A CN103023472A (en) | 2012-12-10 | 2012-12-10 | Special liquid level relay for lithium bromide solution |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105294784A CN103023472A (en) | 2012-12-10 | 2012-12-10 | Special liquid level relay for lithium bromide solution |
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| CN103023472A true CN103023472A (en) | 2013-04-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104317315A (en) * | 2014-11-20 | 2015-01-28 | 南通旭日机电有限公司 | Liquid level control switch device and control circuit |
| CN106104225A (en) * | 2014-03-21 | 2016-11-09 | 金洋产业株式会社 | Condenser type water level detection circuit |
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| CN2264927Y (en) * | 1995-11-08 | 1997-10-15 | 胡鸿良 | Level controller |
| US6128368A (en) * | 1998-12-08 | 2000-10-03 | Teamgreat Corporation | Apparatus for monitoring telecommunication transmission |
| CN1296166A (en) * | 1999-11-16 | 2001-05-23 | 伊利诺斯器械工程公司 | Electric resistance type liquid level test and control system |
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2012
- 2012-12-10 CN CN2012105294784A patent/CN103023472A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2264927Y (en) * | 1995-11-08 | 1997-10-15 | 胡鸿良 | Level controller |
| US6128368A (en) * | 1998-12-08 | 2000-10-03 | Teamgreat Corporation | Apparatus for monitoring telecommunication transmission |
| CN1296166A (en) * | 1999-11-16 | 2001-05-23 | 伊利诺斯器械工程公司 | Electric resistance type liquid level test and control system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106104225A (en) * | 2014-03-21 | 2016-11-09 | 金洋产业株式会社 | Condenser type water level detection circuit |
| CN106104225B (en) * | 2014-03-21 | 2019-04-09 | 金洋产业株式会社 | Condenser type water level detection circuit |
| CN104317315A (en) * | 2014-11-20 | 2015-01-28 | 南通旭日机电有限公司 | Liquid level control switch device and control circuit |
| CN104317315B (en) * | 2014-11-20 | 2017-06-13 | 陈一其 | A kind of liquid level control on-off device and control circuit |
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Application publication date: 20130403 |