CN203480330U - Water level transmitter - Google Patents
Water level transmitter Download PDFInfo
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- CN203480330U CN203480330U CN201320597853.9U CN201320597853U CN203480330U CN 203480330 U CN203480330 U CN 203480330U CN 201320597853 U CN201320597853 U CN 201320597853U CN 203480330 U CN203480330 U CN 203480330U
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- water level
- amplifier
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- optocoupler
- isolation circuit
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Abstract
The utility model relates to a water level transmitter including a power supply unit, a water level detection unit, a control output unit, and a CPU master control unit, wherein the CPU master control unit receives the low water level, middle water level, and high water level signals of the water level detection unit, and transmits a control signal to the control output unit based on the water level signals, the water level detection unit includes a first optical coupler isolation circuit, the water level signals of the water level detection unit are connected to the first general I/O port of the CPU master control unit via the first optical coupler isolation circuit, the control output unit includes a second optical coupler isolation circuit and a relay drive circuit, and the second general I/O port of the CPU master control unit is connected to the relay drive circuit via the second optical coupler isolation circuit. Trough the adoption of the first optical coupler isolation circuit in the water level detection unit, interferences, such as lightning stroke etc. can be prevented from entering into the CPU master control unit. In addition, through the arrangement of the second optical coupler isolation circuit in the control output unit, the normal and reliable operation of the CPU master control unit and the whole transmission system can be further guaranteed.
Description
Technical field
The utility model relates to a kind of water level transmitter.
Background technology
In water and wastewater industry robotization, need to adopt water level transmitter to realize the control and measurement of water level.In water supply type system, when container water level in, during low-level line, water level transmitting system answers output control circuit to continue to carry out retaining, when water level arrives high-level line, water level transmitting system is output control circuit, stops retaining; The duty of dewatering type system is contrary, and when container water level is during in middle and high horizontal line, water level transmitting system answers output control circuit to carry out draining, and when water level arrives low-level line, water level transmitting system is output control circuit, stops draining.
Water and wastewater industry automated system is generally in outdoor, high elevational position, thunderstorm weather is easy to be struck by lightning, in addition, the connecting line of water level detecting unit is longer, the quarantine measures of the connecting line employing shielding line of existing water detecting unit etc., lightning protection effect is not remarkable, cannot hide hindering and damaging of thunderbolt generation, and water and wastewater industry automated system has been caused to certain economic loss and operation difficulty.Existing another kind of water and wastewater industry automated system, the general measuring ability that only possesses low-water level, middle water level and high water stage, because the probe of water level detecting unit infiltrates in water for a long time, easily because the oxidation of getting rusty was lost efficacy, cannot transmit water level detecting signal accurately to water and wastewater industry automation control system, cause the great water yield to run off and lose.
Summary of the invention
The purpose of this utility model is to overcome the defect of prior art, provides a kind of input block and output unit all to have photoelectricity isolation, can make product avoid the water level transmitter of the voltage disturbance such as thunderbolt.
For achieving the above object, the utility model adopts a kind of like this water level transmitter, comprises
Power supply unit, is used to following unit that power supply is provided;
Water level detecting unit, comprises level sensor, for detecting low-water level, middle water level, the high water stage signal of container;
Control output unit, for pilot relay, export the actuating circuit of carrying out retaining and stopping retaining, or export the actuating circuit of carrying out draining and stopping draining;
And CPU main control unit, for receiving low-water level, middle water level and the high water stage signal of described water level detecting unit, and according to water level signal, transfer control signal is to described control output unit;
Described water level detecting unit comprises the first optical coupling isolation circuit, the water level signal of described water level detecting unit is connected to the first universaling I/O port of described CPU main control unit through the first described optical coupling isolation circuit, described control output unit comprises the second optical coupling isolation circuit and relay drive circuit, and the second universaling I/O port of described CPU main control unit is connected to described relay drive circuit through the second described optical coupling isolation circuit.Compared with the prior art, the beneficial effects of the utility model are embodied in: by adopt the first optical coupling isolation circuit in water level detecting unit, can avoid the interference such as thunderbolt to enter CPU main control unit, in addition, also in controlling output unit, the second optical coupling isolation circuit is set, further guarantees the normal reliable operation of CPU main control unit and whole transmitting system.
Especially, described water level transmitter also comprises warning output unit, described water level detecting unit also can detect spilling water signal, described CPU main control unit is according to described spilling water signal, output control signals to described warning output unit, described warning output unit comprises the 3rd optical coupling isolation circuit and warning driving circuit, and the 3rd universaling I/O port of described CPU main control unit is connected to described warning driving circuit through the 3rd described optical coupling isolation circuit.Due to the top of the spilling water detection probe in water level detecting unit in container, water-immersed time less, is not easy to lose efficacy, even if high water stage detection probe had lost efficacy, CPU main control unit still can, when spilling water occurs, be reported to the police in time, notify staff, take in time corresponding measure.
Especially, described water level transmitter also comprises analog quantity transformation unit, described analog quantity transformation output unit comprises the first amplifier and the 4th optical coupling isolation circuit, the 4th described optical coupling isolation circuit comprises the first optocoupler, the emitter output terminal of the first described optocoupler is connected to the in-phase input end of the first described amplifier, the emitter output terminal of the first described optocoupler also connects a reference voltage source, the output terminal of the first described amplifier and the output current signal that becomes the amount of sending, feedback resistance, the end of oppisite phase of the first described amplifier forms backfeed loop, wherein one end of the output current signal of the described change amount of sending is connected to the earth terminal of the first described amplifier through resistance.By adopting the second optical coupling isolation circuit, the remote transmission signal of water level transmitter is difficult for being interfered; Reference voltage source can provide more accurate voltage accuracy, prevents that reference voltage from producing drift with temperature, working environment, simplified the design of power supply; By resistance, make to become the output current signal of the amount of sending and input voltage signal altogether, meet the designing requirement of analog quantity transformation circuit.
Especially, the first described optical coupling isolation circuit comprises the second optocoupler, the 3rd optocoupler, the 4th optocoupler and the 5th optocoupler, the water level electric signal of four tested points is respectively with the voltage stabilizing working point of four groups of mu balanced circuits and connect, and be connected to respectively the inverting input of the second amplifier, the inverting input of the 3rd amplifier, the inverting input of the inverting input of four high guaily unit and the 5th amplifier, the in-phase end of the second described amplifier, the in-phase end of the 3rd described amplifier, the in-phase end of the in-phase end of described four high guaily unit and described the 5th amplifier is in parallel and be connected to a reference voltage, the output terminal of the second described amplifier, the output terminal of the 3rd described amplifier, the output terminal of the output terminal of described four high guaily unit and the 5th described amplifier is through the first current-limiting resistance, the second current-limiting resistance, the 3rd current-limiting resistance and the 4th current-limiting resistance are connected to the second described optocoupler, the 3rd described optocoupler, the input end of the 4th described optocoupler and the 5th described optocoupler.By four groups of mu balanced circuits, realize voltage stabilizing, guarantee that the input comparative voltage of rear class amplifier, in certain scope, meets the design of water level detecting element circuit.
Accompanying drawing explanation
Fig. 1 is the functional-block diagram of the utility model embodiment water level transmitter;
Fig. 2 is the schematic diagram of the utility model embodiment water level transmitter middle water level detecting unit;
Fig. 3 is the schematic diagram of analog quantity transformation unit in the utility model embodiment water level transmitter;
Fig. 4 is the schematic diagram of output unit of reporting to the police in the utility model embodiment water level transmitter;
Fig. 5 controls the schematic diagram of output unit in the utility model embodiment water level transmitter.
Embodiment
As shown in Figures 1 to 3, a kind of water level transmitter, comprises
Power supply unit, is used to following unit that power supply is provided;
Water level detecting unit, comprises level sensor, for detecting low-water level, middle water level, the high water stage signal of container;
Control output unit, for pilot relay, export the actuating circuit of carrying out retaining and stopping retaining, or export the actuating circuit of carrying out draining and stopping draining;
And CPU main control unit, for receiving low-water level, middle water level and the high water stage signal of water level detecting unit, and according to water level signal, transfer control signal is to controlling output unit;
Water level detecting unit comprises the first optical coupling isolation circuit, the water level signal of water level detecting unit is connected to the first universaling I/O port of CPU main control unit through the first optical coupling isolation circuit, control output unit and comprise the second optical coupling isolation circuit and relay drive circuit, the second universaling I/O port of CPU main control unit is connected to relay drive circuit through the second optical coupling isolation circuit.
Water level transmitter also comprises warning output unit, water level detecting unit also can detect spilling water signal, CPU main control unit is according to spilling water signal, output control signals to warning output unit, warning output unit comprises the 3rd optical coupling isolation circuit and warning driving circuit, and the 3rd universaling I/O port of CPU main control unit is connected to warning driving circuit through the 3rd optical coupling isolation circuit.
Water level transmitter also comprises analog quantity transformation unit, analog quantity transformation output unit comprises the first amplifier U14A and the second optical coupling isolation circuit, the second optical coupling isolation circuit comprises the first optocoupler U13, the emitter output terminal of the first optocoupler U13 is connected to the in-phase input end A of the first amplifier U14A, the emitter output terminal of the first optocoupler U13 also connects a reference voltage source VREF, the output terminal of the first amplifier U14A and the output current signal (OUT1 that becomes the amount of sending, OUT2), feedback resistance R55, the end of oppisite phase of the first amplifier U14A forms backfeed loop, become the output current signal (OUT1 of the amount of sending, OUT2) earth terminal of the first amplifier U14A that wherein one end one resistance R 59 is connected to.
The first optical coupling isolation circuit comprises the second optocoupler U8, the 3rd optocoupler U9, the 4th optocoupler U10 and the 5th optocoupler U11, the water level electric signal OV of four tested points, HI, IN, LO is respectively with the voltage stabilizing working point of four groups of mu balanced circuits and connect, and be connected to respectively the inverting input of the second amplifier U12B, the inverting input of the 3rd amplifier U12A, the inverting input of the inverting input of four high guaily unit U12D and the 5th amplifier U12C, the in-phase end of the second amplifier U12B, the in-phase end of the 3rd amplifier U12A, the in-phase end parallel connection of the in-phase end of four high guaily unit U12D and the 5th amplifier U12C is also connected to a reference voltage VR, the output terminal of the second amplifier U12B, the output terminal of the 3rd amplifier U12A, the output terminal of the output terminal of four high guaily unit U12D and the 5th amplifier U12C is through the first current-limiting resistance R19, the second current-limiting resistance R20, the 3rd current-limiting resistance R21 and the 4th current-limiting resistance R22 are connected to the second optocoupler U8, the 3rd optocoupler U9, the input end of the 4th optocoupler U10 and the 5th optocoupler U11.
Claims (5)
1. a water level transmitter, is characterized in that: comprise
Power supply unit, is used to following unit that power supply is provided;
Water level detecting unit, comprises level sensor, for detecting low-water level, middle water level, the high water stage signal of container;
Control output unit, for pilot relay, export the actuating circuit of carrying out retaining and stopping retaining, or export the actuating circuit of carrying out draining and stopping draining;
And CPU main control unit, for receiving low-water level, middle water level and the high water stage signal of described water level detecting unit, and according to water level signal, transfer control signal is to described control output unit;
Described water level detecting unit comprises the first optical coupling isolation circuit, the water level signal of described water level detecting unit is connected to the first universaling I/O port of described CPU main control unit through the first described optical coupling isolation circuit, described control output unit comprises the second optical coupling isolation circuit and relay drive circuit, and the second universaling I/O port of described CPU main control unit is connected to described relay drive circuit through the second described optical coupling isolation circuit.
2. water level transmitter according to claim 1, it is characterized in that: described water level transmitter also comprises warning output unit, described water level detecting unit also can detect spilling water signal, described CPU main control unit is according to described spilling water signal, output control signals to described warning output unit, described warning output unit comprises the 3rd optical coupling isolation circuit and warning driving circuit, and the 3rd universaling I/O port of described CPU main control unit is connected to described warning driving circuit through the 3rd described optical coupling isolation circuit.
3. water level transmitter according to claim 1 and 2, it is characterized in that: described water level transmitter also comprises analog quantity transformation unit, described analog quantity transformation output unit comprises the first amplifier and the 4th optical coupling isolation circuit, the 4th described optical coupling isolation circuit comprises the first optocoupler, the emitter output terminal of the first described optocoupler is connected to the in-phase input end of the first described amplifier, the emitter output terminal of the first described optocoupler also connects a reference voltage source, the output terminal of the first described amplifier and the output current signal that becomes the amount of sending, feedback resistance, the end of oppisite phase of the first described amplifier forms backfeed loop, wherein one end of the output current signal of the described change amount of sending is connected to the earth terminal of the first described amplifier through resistance.
4. water level transmitter according to claim 3, is characterized in that: the first described optical coupling isolation circuit comprises the second optocoupler, the 3rd optocoupler, the 4th optocoupler and the 5th optocoupler, the water level electric signal of four tested points is respectively with the voltage stabilizing working point of four groups of mu balanced circuits and connect, and is connected to respectively the inverting input of the second amplifier, the inverting input of the 3rd amplifier, the inverting input of the inverting input of four high guaily unit and the 5th amplifier, the in-phase end of the second described amplifier, the in-phase end of the 3rd described amplifier, the in-phase end of the in-phase end of described four high guaily unit and described the 5th amplifier is in parallel and be connected to a reference voltage, the output terminal of the second described amplifier, the output terminal of the 3rd described amplifier, the output terminal of the output terminal of described four high guaily unit and the 5th described amplifier is through the first current-limiting resistance, the second current-limiting resistance, the 3rd current-limiting resistance and the 4th current-limiting resistance are connected to the second described optocoupler, the 3rd described optocoupler, the input end of the 4th described optocoupler and the 5th described optocoupler.
5. water level transmitter according to claim 2, is characterized in that: the first described optical coupling isolation circuit comprises the second optocoupler, the 3rd optocoupler, the 4th optocoupler and the 5th optocoupler, the water level electric signal of four tested points is respectively with the voltage stabilizing working point of four groups of mu balanced circuits and connect, and is connected to respectively the inverting input of the second amplifier, the inverting input of the 3rd amplifier, the inverting input of the inverting input of four high guaily unit and the 5th amplifier, the in-phase end of the second described amplifier, the in-phase end of the 3rd described amplifier, the in-phase end of the in-phase end of described four high guaily unit and described the 5th amplifier is in parallel and be connected to a reference voltage, the output terminal of the second described amplifier, the output terminal of the 3rd described amplifier, the output terminal of the output terminal of described four high guaily unit and the 5th described amplifier is through the first current-limiting resistance, the second current-limiting resistance, the 3rd current-limiting resistance and the 4th current-limiting resistance are connected to the second described optocoupler, the 3rd described optocoupler, the input end of the 4th described optocoupler and the 5th described optocoupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320597853.9U CN203480330U (en) | 2013-09-24 | 2013-09-24 | Water level transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320597853.9U CN203480330U (en) | 2013-09-24 | 2013-09-24 | Water level transmitter |
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| Publication Number | Publication Date |
|---|---|
| CN203480330U true CN203480330U (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320597853.9U Expired - Fee Related CN203480330U (en) | 2013-09-24 | 2013-09-24 | Water level transmitter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105648699A (en) * | 2014-11-17 | 2016-06-08 | 无锡飞翎电子有限公司 | Drum type washing machine and control method thereof |
| CN106643980A (en) * | 2016-12-29 | 2017-05-10 | 重庆多邦科技股份有限公司 | Laser water level indicator |
| CN108107929A (en) * | 2018-02-06 | 2018-06-01 | 欣灵电气股份有限公司 | Fluid level controller |
-
2013
- 2013-09-24 CN CN201320597853.9U patent/CN203480330U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105648699A (en) * | 2014-11-17 | 2016-06-08 | 无锡飞翎电子有限公司 | Drum type washing machine and control method thereof |
| CN106643980A (en) * | 2016-12-29 | 2017-05-10 | 重庆多邦科技股份有限公司 | Laser water level indicator |
| CN108107929A (en) * | 2018-02-06 | 2018-06-01 | 欣灵电气股份有限公司 | Fluid level controller |
| CN108107929B (en) * | 2018-02-06 | 2023-11-10 | 欣灵电气股份有限公司 | Liquid level controller |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20170924 |