CN205787925U - Liquid level relay - Google Patents
Liquid level relay Download PDFInfo
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- CN205787925U CN205787925U CN201620503663.XU CN201620503663U CN205787925U CN 205787925 U CN205787925 U CN 205787925U CN 201620503663 U CN201620503663 U CN 201620503663U CN 205787925 U CN205787925 U CN 205787925U
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- water level
- resistance
- signal processing
- processing unit
- output unit
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Abstract
A kind of liquid level relay, including power subsystem, water level sensing unit, signal processing unit and control output unit；Described power subsystem respectively with water level sensing unit, signal processing unit, control output unit connect, for water level sensing unit, signal processing unit and control output unit provide working power；The outfan of described water level sensing unit is connected with the input of signal processing unit and the input of control output unit respectively, and the outfan of signal processing unit is connected with the input controlling output unit, is used for controlling output unit action；Described water level sensing unit includes photoelectrical coupler IC, the input of described photoelectrical coupler IC is connected with signal processing unit and control output unit respectively, the outfan of photoelectrical coupler IC is connected with the high water level electrode in water tank and middle water level electrode, for controlling high water level electrode and the break-make of middle water level electrode, the low water level electrode in water tank is connected with power subsystem.
Description
Technical field
This utility model relates to Low Voltage Electrical Apparatus, particularly to a kind of liquid level relay.
Background technology
Existing liquid level relay has detection low water level, middle water level, the function of high water level, uses low water level electrode end defeated
Go out signal, turned on by aqueous medium, opening of middle water level, high water level electrode termination collection of letters control miniature relay contact
Closing, another miniature relay normally-closed contact controls middle water level, the break-make of high water level electrode end, (water level decreasing during hull-borne
More than high water level electrode end following middle water level electrode tip, keep liquid level relay contacts status, prevent water pump start and stop frequently
Drain function can not be realized), there is the shortcoming that volume is big, price is high in relay, causes that product overall volume is bigger than normal, production cost
Higher.
Summary of the invention
The purpose of this utility model is to overcome the defect of prior art, it is provided that a kind of performance safety is stable, circuit structure
Simply, the liquid level relay of low cost.
For achieving the above object, this utility model adopts the technical scheme that
A kind of liquid level relay, including power subsystem, water level sensing unit, signal processing unit and control output unit；
Described power subsystem respectively with water level sensing unit, signal processing unit, control output unit connect, for water level sensing unit,
Signal processing unit and control output unit provide working power；The outfan of described water level sensing unit respectively with signal processing
The input of the input of unit and control output unit connects, and the outfan of signal processing unit is defeated with control output unit
Enter end to connect, be used for controlling output unit action；Described water level sensing unit includes photoelectrical coupler IC, described smooth thermocouple
The input of clutch IC is connected with signal processing unit and control output unit respectively, the outfan of photoelectrical coupler IC and water tank
In high water level electrode 5 and middle water level electrode 6 connect, for controlling high water level electrode 5 and the break-make of middle water level electrode 6, water tank
In low water level electrode 7 be connected with power subsystem.
Further, described high water level electrode 5, middle water level electrode 6 and low water level electrode 7 are liquid level sensor, are used for detecting
Water level signal in water tank, and export to signal processing unit；Signal processing unit is by controlling the input of photoelectrical coupler IC
End conducting turns off control output unit.
Further, described power subsystem includes transformator T1 and rectifier bridge D1, and the primary side of transformator T1 connects power supply, becomes
The secondary side of depressor T1 is connected with the input of rectifier bridge D1, the outfan of rectifier bridge D1 respectively with water level sensing unit, signal
Processing unit and control output unit connect.
Further, described signal processing unit includes resistance R5, resistance R6, resistance R7, audion VT2 and diode D4；
The output head anode of photoelectrical coupler IC is connected with middle water level electrode 6, the negative pole of output end of photoelectrical coupler IC and diode D4
Positive pole connect, the negative pole of diode D4 is connected with high water level electrode 5；One end of resistance R5 is connected with the negative pole of diode D4,
The other end is connected with the base stage of audion VT2, and the colelctor electrode of audion VT2 is connected to the input cathode of photoelectrical coupler IC,
The emitter stage of audion VT2 is through resistance R7 ground connection, and the input anode of photoelectrical coupler IC is connected with controlling output unit, and three
The emitter stage of pole pipe VT2 is connected with control output unit simultaneously, and one end of resistance R6 is connected with the base stage of audion VT2, another
End ground connection.
Further, described control output unit includes miniature relay K1, and signal processing unit is by controlling small-sized relay
Device K1 controls the break-make of water pump.
Further, described control output unit also includes resistance R1, resistance R2, Zener diode D2, audion VT1, two
Pole pipe D3 and electric capacity C2；Resistance R1 and resistance R2 is connected in series, and after series connection, one end of resistance R1 connects with the outfan of power subsystem
Connecing, one end of resistance R2 is connected with the negative pole of Zener diode D2, and the positive pole of Zener diode D2 connects with the base stage of audion VT1
Connecing, the emitter stage of audion VT1 is connected with signal processing unit, and the intermediate node of resistance R1 and resistance R2 is connected to photoelectric coupling
The input anode of device IC, electric capacity C2 and diode D3, miniature relay K1 is connected in one end and three of resistance R1 successively in parallel
The colelctor electrode of pole pipe VT1.
Further, also include that described indicating member includes luminescence for indicating water supply or the indicating member of hull-borne
Diode (LED) 1, resistance R3, LED 2, resistance R4 and Zener diode D5；Described LED 1 is just
Pole is connected with the outfan of power subsystem, and the negative pole of LED 1 is connected with one end of resistance R3, another of resistance R3
Hold and be connected with control output unit；The positive pole of LED 2 is connected with the other end of resistance R3, one end of resistance R4 with
The negative pole of LED 2 connects, and the other end is connected with the negative pole of Zener diode D5, the positive pole of Zener diode D5 and
Signal processing unit connects.
This utility model liquid level relay, the water level sensing unit of the liquid level relay outfan by photoelectrical coupler IC
It is connected with the high water level electrode in water tank and middle water level electrode, controls high water level electrode and middle water level electrode break-make, simplify liquid
Position relay, reduces cost, and photoelectrical coupler IC input and outfan fully achieve electrical isolation, and capacity of resisting disturbance is strong,
Improve circuit integrity energy.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of this utility model liquid level relay；
Fig. 2 is the circuit diagram of this utility model liquid level relay.
Detailed description of the invention
The embodiment be given below in conjunction with accompanying drawing 1 to 2, further illustrates the concrete real of liquid level relay of the present utility model
Execute mode.Liquid level relay of the present utility model is not limited to the following description.
As shown in Figure 1-2, this utility model liquid level relay, including power subsystem, water level sensing unit, signal processing list
Unit and control output unit；Described power subsystem respectively with water level sensing unit, signal processing unit, control output unit even
Connect, provide working power for water level sensing unit, signal processing unit and control output unit；Described water level sensing unit defeated
Go out end to be connected with the input of signal processing unit and the input of control output unit respectively, the outfan of signal processing unit
It is connected with the input controlling output unit, for controlling the break-make of output unit, controls output unit and be used for performing confession
Water and stop water supply action or perform draining and stop draining action；Described water level sensing unit includes photoelectrical coupler IC,
The input of described photoelectrical coupler IC is connected with signal processing unit and control output unit respectively, and photoelectrical coupler IC's is defeated
Go out end to be connected with the high water level electrode 5 in water tank and middle water level electrode 6, be used for controlling high water level electrode 5 and middle water level electrode 6
Break-make, the low water level electrode 7 in water tank is connected with power subsystem；Signal processing unit is by controlling the input of photoelectrical coupler IC
End conducting turns off control output unit.This utility model liquid level relay, by outfan and the water tank of photoelectrical coupler IC
In high water level electrode and middle water level electrode connect, control high water level electrode and middle water level electrode break-make, simplify liquid level relay
Device, reduces cost, and photoelectrical coupler IC input and outfan fully achieve electrical isolation, and capacity of resisting disturbance is strong, improve electricity
Road overall performance.
Specifically, photoelectrical coupler IC controls high water level electrode and middle water level electrode break-make in the following manner: on water level
When being raised to high water level electrode 5, signal processing unit receives the signal transmitted at high water level electrode 5, and photoelectrical coupler IC's is defeated
Entering end conducting, make the outfan of photoelectrical coupler IC turn on, high water level electrode 5 and middle water level electrode 6 are by photoelectrical coupler IC
Outfan conducting, when water level decreasing is to time between high water level electrode 5 and middle water level electrode 6, and signal processing unit receives therefrom
The signal that level electrode 6 transmits through the output of photoelectrical coupler IC, the input of photoelectrical coupler IC still turns on, and makes light
The outfan of electric coupler IC continues conducting, keeps liquid level relay contacts status, prevents water pump start and stop frequently from can not realize
Drain function, when water level decreasing is to time between middle water level electrode 6 and low water level electrode 7, and signal processing unit does not receives signal, light
The input of electric coupler IC is not turned on, and makes the outfan of photoelectrical coupler IC disconnect, high water level electrode 5 and middle water level electrode 6
Disconnect.Especially, described high water level electrode 5, middle water level electrode 6 and low water level electrode 7 are liquid level sensor, are used for detecting water tank
In water level signal, and export to signal processing unit.
As in figure 2 it is shown, described power subsystem includes transformator T1 and rectifier bridge D1, the primary side of transformator T1 connects electricity
Source, the secondary side of transformator T1 is connected with the input of rectifier bridge D1, the outfan of rectifier bridge D1 respectively with water level sensing unit,
Signal processing unit and control output unit connect.Power subsystem provides stable supply voltage for subsequent conditioning circuit.
As in figure 2 it is shown, described signal processing unit includes resistance R5, resistance R6, resistance R7, audion VT2 and diode
D4；The output head anode of photoelectrical coupler IC is connected with middle water level electrode 6, the negative pole of output end of photoelectrical coupler IC and diode
The positive pole of D4 connects, and the negative pole of diode D4 is connected with high water level electrode 5；One end of resistance R5 connects with the negative pole of diode D4
Connecing, the other end is connected with the base stage of audion VT2, and the colelctor electrode of audion VT2 is connected to the input of photoelectrical coupler IC and bears
Pole, the emitter stage of audion VT2 is through resistance R7 ground connection, and the input anode of photoelectrical coupler IC connects with controlling output unit
Connecing, the emitter stage of audion VT2 is connected with control output unit simultaneously, and one end of resistance R6 is connected with the base stage of audion VT2,
Other end ground connection.
As in figure 2 it is shown, described control output unit includes resistance R1, resistance R2, Zener diode D2, audion VT1, little
Type relay K 1, diode D3 and electric capacity C2；Resistance R1 and resistance R2 is connected in series, one end of resistance R1 and power supply list after series connection
The outfan of unit connects, and one end of resistance R2 is connected with the negative pole of Zener diode D2, the positive pole of Zener diode D2 and three poles
The base stage of pipe VT1 connects, and the emitter stage of audion VT1 is connected with signal processing unit, resistance R1 and the intermediate node of resistance R2
Being connected to the input anode of photoelectrical coupler IC, electric capacity C2 and diode D3, miniature relay K1 is connected in electricity successively in parallel
One end of resistance R1 and the colelctor electrode of audion VT1.
Specifically, during water supply, when water level rises to high water level electrode 5, signal processing unit is by connecting triode
The input conducting of VT2, photoelectrical coupler IC, drags down the voltage of audion VT1 base stage and emitter stage, makes audion VT1 current collection
Pole and emitter stage disconnect, miniature relay K1 coil losing electricity, and relay contact resets, and feed pump stops supplying water.During draining, work as water
When position drops to middle water level electrode 6 and low water level electrode 7, audion VT2 collector and emitter disconnects, and audion VT1 turns on,
Miniature relay K1 coil obtains electric, relay contact action, and suction pump stops pumping.
As in figure 2 it is shown, also include that, for indicating water supply or the indicating member of hull-borne, described indicating member includes sending out
Optical diode LED1, resistance R3, LED 2, resistance R4 and Zener diode D5；Described LED 1
Positive pole is connected with the outfan of power subsystem, and the negative pole of LED 1 is connected with one end of resistance R3, and resistance R3's is another
One end is connected with controlling output unit；The positive pole of LED 2 is connected with the other end of resistance R3, one end of resistance R4
Being connected with the negative pole of LED 2, the other end is connected with the negative pole of Zener diode D5, the positive pole of Zener diode D5
It is connected with signal processing unit.When controlling output unit connection, LED 1 is bright, when signal processing unit is connected, sends out
Optical diode LED2 is bright.
Water supply type liquid level relay and the operation principle of dewatering type liquid level relay be given below:
Water supply type liquid level relay: Water in Water Tanks position is when middle potential electrode end less than 6, and DC source passes through resistance R1, electricity
Resistance R2, Zener diode D2 connecting triode VT1 base stage, make audion VT1 collector and emitter turn on, miniature relay K1
Obtaining of coil is electric, and relay contact action, Light-Emitting Diode LED1 is bright, suction pump water supply start.When water level rises to middle position electricity
During extreme more than 6, high water level electrode less than 5, relay contact still action, Light-Emitting Diode LED1 continues bright, and suction pump continues
Continuous water supply.When water level rises to high water level electrode more than 5, DC source passes through low position electrode end 7 output signal, is situated between by water
Matter, high water level electrode end 5 receives signal, and by resistance R5 connecting triode VT2 base stage, makes audion VT2 turn on, therefore light
Electric coupler IC input side turns on, and has dragged down the voltage of audion VT1 base stage and emitter stage, makes audion VT1 colelctor electrode and sends out
Emitter-base bandgap grading disconnects, miniature relay K1 coil losing electricity, and relay contact resets, and LED 1 does not works, light emitting diode
LED2 is bright, and suction pump stops supplying water.
Dewatering type liquid level relay: when water level is in high water level electrode more than 5, DC source is defeated by low position electrode end 7
Going out signal, by aqueous medium, electrode 5 receives signal, and by resistance R5 connecting triode VT2 base stage, makes audion VT2 lead
Logical, photoelectrical coupler IC input side turns on, and has dragged down the voltage of audion VT1 base stage and emitter stage, has made audion VT1 colelctor electrode
With emitter stage disconnect, miniature relay K1 coil not electric, LED 1 does not works, and LED 2 is bright, relay
Device contact is original state, and suction pump starts to draw water.When water level decreasing to high water level electrode less than 5, middle potential electrode end more than 6
Time, DC source passes through low position electrode end 7 output signal, and by aqueous medium, middle potential electrode end 6 receives signal, and photoelectric coupling
Device IC input side turns on, and its outlet side is also switched on, and signal is connected by photoelectrical coupler IC outlet side, diode D4, resistance R5
Audion VT2 base stage, makes audion VT2 still turn on, and audion VT1 collector and emitter still closes, miniature relay
K1 coil the most not electric, relay contact remains in that original state, LED 1 still do not work, light emitting diode
LED2 is the brightest, and suction pump still draws water.When water level decreasing to middle potential electrode end less than 6, electrode 6 can not receive signal, and three
Pole pipe VT2 collector and emitter disconnects, and audion VT1 turns on, and miniature relay K1 coil obtains electric, relay contact action,
LED 1 is bright, and LED 2 does not works, and suction pump stops pumping.
Above content is to combine concrete preferred implementation further detailed description of the utility model, it is impossible to
Assert that of the present utility model being embodied as is confined to these explanations.Ordinary skill for this utility model art
For personnel, without departing from the concept of the premise utility, it is also possible to make some simple deduction or replace, all should regard
For belonging to protection domain of the present utility model.
Claims (7)
1. a liquid level relay, it is characterised in that: include power subsystem, water level sensing unit, signal processing unit and control
Output unit；Described power subsystem respectively with water level sensing unit, signal processing unit, control output unit connect, for water level
Detector unit, signal processing unit and control output unit provide working power；The outfan of described water level sensing unit is respectively
Being connected with the input of signal processing unit and the input of control output unit, the outfan of signal processing unit is defeated with control
The input going out unit connects, and is used for controlling output unit action；
Described water level sensing unit includes photoelectrical coupler IC, the input of described photoelectrical coupler IC respectively with signal processing list
Unit and control output unit connect, the outfan of photoelectrical coupler IC and the high water level electrode (5) in water tank and middle water level electrode
(6) connect, be used for controlling high water level electrode (5) and the break-make of middle water level electrode (6), the low water level electrode (7) in water tank and electricity
Source unit connects.
Liquid level relay the most according to claim 1, it is characterised in that: described high water level electrode (5), middle water level electrode
(6) and low water level electrode (7) is liquid level sensor, for detecting the water level signal in water tank, and export to signal processing unit；
Signal processing unit turns off control output unit by controlling the input conducting of photoelectrical coupler IC.
Liquid level relay the most according to claim 1, it is characterised in that: described power subsystem includes transformator T1 and rectification
The primary side of bridge D1, transformator T1 connects power supply, and the secondary side of transformator T1 is connected with the input of rectifier bridge D1, rectifier bridge D1
Outfan be connected with water level sensing unit, signal processing unit and control output unit respectively.
Liquid level relay the most according to claim 1, it is characterised in that: described signal processing unit includes resistance R5, electricity
Resistance R6, resistance R7, audion VT2 and diode D4；The output head anode of photoelectrical coupler IC is connected with middle water level electrode (6),
The negative pole of output end of photoelectrical coupler IC is connected with the positive pole of diode D4, and the negative pole of diode D4 is with high water level electrode (5) even
Connect；One end of resistance R5 is connected with the negative pole of diode D4, and the other end is connected with the base stage of audion VT2, the collection of audion VT2
Electrode is connected to the input cathode of photoelectrical coupler IC, and the emitter stage of audion VT2 is through resistance R7 ground connection, photoelectrical coupler
The input anode of IC is connected with controlling output unit, and the emitter stage of audion VT2 is connected with control output unit simultaneously, resistance
One end of R6 is connected with the base stage of audion VT2, other end ground connection.
Liquid level relay the most according to claim 1, it is characterised in that: described control output unit includes miniature relay
K1, signal processing unit controls the break-make of water pump by controlling miniature relay K1.
Liquid level relay the most according to claim 5, it is characterised in that: described control output unit also includes resistance R1,
Resistance R2, Zener diode D2, audion VT1, diode D3 and electric capacity C2；Resistance R1 and resistance R2 is connected in series, after series connection
One end of resistance R1 is connected with the outfan of power subsystem, and one end of resistance R2 is connected with the negative pole of Zener diode D2, voltage stabilizing
The positive pole of diode D2 is connected with the base stage of audion VT1, and the emitter stage of audion VT1 is connected with signal processing unit, resistance
The intermediate node of R1 and resistance R2 is connected to the input anode of photoelectrical coupler IC, electric capacity C2 and diode D3, small-sized relay
Device K1 is connected in one end and the colelctor electrode of audion VT1 of resistance R1 successively in parallel.
Liquid level relay the most according to claim 1, it is characterised in that: also include for indicating water supply or hull-borne
Indicating member, described indicating member includes LED 1, resistance R3, LED 2, resistance R4 and voltage stabilizing
Diode D5；The described positive pole of LED 1 is connected with the outfan of power subsystem, the negative pole of LED 1
Being connected with one end of resistance R3, the other end of resistance R3 is connected with controlling output unit；The positive pole of LED 2 and electricity
The other end of resistance R3 connects, and one end of resistance R4 is connected with the negative pole of LED 2, the other end and Zener diode D5
Negative pole connect, the positive pole of Zener diode D5 is connected with signal processing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620503663.XU CN205787925U (en) | 2016-05-30 | 2016-05-30 | Liquid level relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620503663.XU CN205787925U (en) | 2016-05-30 | 2016-05-30 | Liquid level relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205787925U true CN205787925U (en) | 2016-12-07 |
Family
ID=59979468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620503663.XU Active CN205787925U (en) | 2016-05-30 | 2016-05-30 | Liquid level relay |
Country Status (1)
| Country | Link |
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| CN (1) | CN205787925U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108052130A (en) * | 2017-12-12 | 2018-05-18 | 长沙科悦企业管理咨询有限公司 | A kind of quantitative water compensating automatic controller |
| CN110313878A (en) * | 2019-08-08 | 2019-10-11 | 徐州工业职业技术学院 | A kind of automatic dish-washing machine |
-
2016
- 2016-05-30 CN CN201620503663.XU patent/CN205787925U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108052130A (en) * | 2017-12-12 | 2018-05-18 | 长沙科悦企业管理咨询有限公司 | A kind of quantitative water compensating automatic controller |
| CN110313878A (en) * | 2019-08-08 | 2019-10-11 | 徐州工业职业技术学院 | A kind of automatic dish-washing machine |
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