CN2293055Y - Opto-electronic coupled AC multi-liquid level measuring device - Google Patents

Opto-electronic coupled AC multi-liquid level measuring device Download PDF

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Publication number
CN2293055Y
CN2293055Y CN 96243031 CN96243031U CN2293055Y CN 2293055 Y CN2293055 Y CN 2293055Y CN 96243031 CN96243031 CN 96243031 CN 96243031 U CN96243031 U CN 96243031U CN 2293055 Y CN2293055 Y CN 2293055Y
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CN
China
Prior art keywords
probe
utility
model
bridge rectifier
liquid level
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 96243031
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Chinese (zh)
Inventor
刘建国
魏庆农
王亚萍
李纯仁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Institute of Optics and Fine Mechanics of CAS
Original Assignee
Anhui Institute of Optics and Fine Mechanics of CAS
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Application filed by Anhui Institute of Optics and Fine Mechanics of CAS filed Critical Anhui Institute of Optics and Fine Mechanics of CAS
Priority to CN 96243031 priority Critical patent/CN2293055Y/en
Application granted granted Critical
Publication of CN2293055Y publication Critical patent/CN2293055Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model is characterized in that alternating current of power frequency after voltage reduction by a transformer can be supplied to probes, and a photoelectric coupler and a bridge rectifier are combined into a measuring circuit. The numbers of the probes and the circuits can be determined according to various different requirements. The utility model can be used for measuring a plurality of liquid levels by photoelectric isolation, and can be suitable for various liquid with certain conducting performance. The utility model has the advantages of low cost and reliable performance.

Description

Photoelectric coupling type exchanges the multi-level detecting device
The utility model relates to the automatic control of liquid technology.
Liquid level detection device send fields such as water and robotization washing machine to have a wide range of applications at water tower feedwater, water softening, boiler.
Traditional float-ball type machinery water level mechanism, because action response is slow, control accuracy is low, can not adapt to the needs of automatic feeding water system; And the pressure type level sensor is because its cost is higher, and when being used for water level detecting, and accuracy of detection is not ideal enough also to be influenced it and apply; Have only probe-type water level detecting mechanism low because of its cost, the control accuracy height, response speed has obtained using widely soon.But at present the probe-type condensate tank of dehumidifier that uses mostly is single flow, its structure as shown in Figure 1, when two probes (anodal, negative pole) when touching liquid level, flow through DC current between probe.But because electrolytic effect, after long-term the use, detecting probe surface can be covered by nonconducting oxide gradually, to making its forfeiture electric conductivity, probe is lost efficacy.
Use AC probe can avoid electrolytic effect, the Level Detection special IC of more existing use AC probe can only detect a liquid level but the shortcoming of this class chip circuit is a chip.When needing a plurality of liquid level of control, use a plurality of chips, this just makes complex circuit, the cost height.Because the probe of this circuit and control circuit are not isolated on electric, easily make the interference free performance variation of control section in addition.
The purpose of this utility model provides a kind of above-mentioned all kinds of water level detecting shortcomings that overcome, probe and control circuit be electric to be gone up and isolate, and can control a plurality of liquid levels, low-cost, practical AC probe formula liquid level detector simultaneously.
The technical solution of the utility model is that the use industrial-frequency alternating current as the AC power of probe, is combined to form the detection loop to photoelectrical coupler and bridge rectifier after the transformer step-down.
Below in conjunction with accompanying drawing, the utility model is described in detail it.
Accompanying drawing 1 is existing direct current probe-type water level detecting structural drawing;
Accompanying drawing 2 is structural drawing of the present utility model.
Among the figure: P 0, P 1~P nProbe; D 1~D nFull-bridge rectifier; R 1, R 2, R 3, R 4, R N1, R N2, R N3, R N4Resistance; U 1~U nPhotoelectrical coupler; C 1~C nCapacitor; T 1~T nTriode; The TR transformer.
Structure of the present utility model, as shown in Figure 2, its structure is:
Transformer (TR) is by probe (P 0) and (P 1) and full-bridge rectifier (D 1) the interchange branch road be in series full-bridge rectifier (D 1) direct current branch and current-limiting resistance (R 1), photoelectrical coupler (U 1) light emitting diode be in series capacitor (C 1) be connected in parallel on full-bridge rectifier (D 1) two ends, strobe; By triode (T 1), resistance (R 2), (R 3) and (R 4) amplifier and the photoelectrical coupler (U that form 1) light emitting diode be in series, be to be used for amplifying photoelectrical coupler (U 1) output current of output terminal triode, and drive the subsequent control circuit.
The used probe of the utility model is (P 1~P n) individual, according to the needs of survey water level, select the number of probe, form many group the utility model circuit.
During the utility model work, probe do not had in the entry bridge rectifier (D 1~D n) the probe (P that flows through 0) and (P 1~P n) between the alternating current rectification be pulsating direct current, through electric capacity (C 1~C n) after filtering is level and smooth, by resistance (R 1~R n) make photoelectrical coupler (U 1~U n) the light emitting diode conducting, making the A point voltage is high level by zero volt saltus step, by triode (T 1~T n) anti-phase, it is zero volt that the B point voltage is jumped by high level, thereby makes the subsequent control circuit operation.
The utility model can be accurately, promptly a plurality of liquid levels are carried out photoelectricity detects isolator, can be applicable to the water tower feedwater, water softening, and boiler send water, and robotization washing machines etc. are various to be needed in the application system of water level detecting.In a word, the utility model can be widely used in having the Level Detection of the various liquid of certain electric conductivity.

Claims (2)

1. a photoelectric coupling type exchanges the multi-level detecting device, by probe, etc. form, it is characterized in that, transformer is in series with the branch road that exchanges of full-bridge rectifier by probe, the light emitting diode of the direct current branch of full-bridge rectifier and current-limiting resistance, photoelectrical coupler is in series, capacitor is connected in parallel on the two ends of full-bridge rectifier, and the amplifier of being made up of triode and resistance and the light emitting diode of photoelectrical coupler are in series
2. liquid level detector as claimed in claim 1 is characterized in that the number of probe is P 1~P n, bridge rectifier is D 1~D nPhotoelectrical coupler is U 1~U nResistance is R 1~R N1, R 2~R N2, R 3~R N3R 4~R N4Electric capacity is C 1~C nTriode is T 1~T n
CN 96243031 1996-11-01 1996-11-01 Opto-electronic coupled AC multi-liquid level measuring device Expired - Fee Related CN2293055Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 96243031 CN2293055Y (en) 1996-11-01 1996-11-01 Opto-electronic coupled AC multi-liquid level measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 96243031 CN2293055Y (en) 1996-11-01 1996-11-01 Opto-electronic coupled AC multi-liquid level measuring device

Publications (1)

Publication Number Publication Date
CN2293055Y true CN2293055Y (en) 1998-09-30

Family

ID=33916768

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 96243031 Expired - Fee Related CN2293055Y (en) 1996-11-01 1996-11-01 Opto-electronic coupled AC multi-liquid level measuring device

Country Status (1)

Country Link
CN (1) CN2293055Y (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1299101C (en) * 2002-03-11 2007-02-07 恩德莱斯和豪瑟尔两合公司 Field device electronics for conductive limit level switches
CN100459000C (en) * 2006-07-19 2009-02-04 中国科学院等离子体物理研究所 Explosion switch state detector
CN1719263B (en) * 2005-05-24 2011-02-09 株洲时代电子技术有限公司 Passive strong isolation micro voltage detection switch
CN105203180A (en) * 2015-09-16 2015-12-30 湖南中航精工有限公司 Water level detection circuit of saturated steam generator
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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1299101C (en) * 2002-03-11 2007-02-07 恩德莱斯和豪瑟尔两合公司 Field device electronics for conductive limit level switches
CN1719263B (en) * 2005-05-24 2011-02-09 株洲时代电子技术有限公司 Passive strong isolation micro voltage detection switch
CN100459000C (en) * 2006-07-19 2009-02-04 中国科学院等离子体物理研究所 Explosion switch state detector
CN105203180A (en) * 2015-09-16 2015-12-30 湖南中航精工有限公司 Water level detection circuit of saturated steam generator
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

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GR01 Patent grant
C19 Lapse of patent right due to non-payment of the annual fee
CF01 Termination of patent right due to non-payment of annual fee