CN110067944B - Liquid pipeline state detecting system - Google Patents
Liquid pipeline state detecting system Download PDFInfo
- Publication number
- CN110067944B CN110067944B CN201910421821.5A CN201910421821A CN110067944B CN 110067944 B CN110067944 B CN 110067944B CN 201910421821 A CN201910421821 A CN 201910421821A CN 110067944 B CN110067944 B CN 110067944B
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- China
- Prior art keywords
- voltage comparator
- voltage
- photoelectric sensor
- triode
- input end
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- 239000007788 liquid Substances 0.000 title claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 230000003321 amplification Effects 0.000 claims abstract description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 4
- 238000003745 diagnosis Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
Abstract
The invention discloses a liquid pipeline state detection system, which comprises a photoelectric sensor detection unit, a voltage comparison unit, a signal amplification unit and a singlechip; the photoelectric sensor unit comprises a photoelectric sensor U1 and a current limiting resistor R3 connected in series with the output end of the photoelectric sensor U1, and the input end of the photoelectric sensor U1 is connected with a power supply voltage Vcc through the current limiting resistor R1; the voltage comparison unit consists of a voltage division circuit and a double-channel voltage comparator, wherein the double-channel voltage comparator consists of a first voltage comparator U2.1 and a second voltage comparator U2.2; the signal amplifying unit comprises a triode Q1, the output ends of a first voltage comparator U2.1 and a second voltage comparator U2.2 of the base electrode of the triode Q1 are connected, the collector electrode of the triode Q1 is connected with the signal input end of the singlechip and with the working voltage VDD, and the emitter electrode of the triode Q1 is grounded. The invention has the advantages that the invention is specially designed for detecting the state of the liquid pipeline in the medical detecting instrument, and provides safety guarantee for patient diagnosis.
Description
Technical Field
The invention relates to a detection circuit, in particular to a liquid pipeline state detection system.
Background
At present, a pressure detection mode is mostly adopted for detecting the state of a liquid pipeline, and whether the state of the pipeline is blocked or sucked or not is judged through the change of the internal pressure difference value of the liquid pipeline. The differential pressure detection mode is mainly applied to a liquid pipeline loop with larger hydrodynamic force, and the accuracy requirement of the liquid pressure detection water pressure sensor is higher and the price is high. The liquid pipeline in the medical detection (diagnosis) instrument is characterized by smaller hydrodynamic force and pipeline diameter and limited installation space, so that the pressure difference detection mode is not suitable for detecting the state of the liquid pipeline in the medical detection instrument.
Disclosure of Invention
The invention aims to provide a liquid pipeline state detection system suitable for medical detection (diagnosis) instruments.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention relates to a liquid pipeline state detection system, which comprises a photoelectric sensor detection unit, a voltage comparison unit, a signal amplification unit and a singlechip;
the photoelectric sensor unit comprises a photoelectric sensor U1 and a current limiting resistor R3 connected in series with the output end of the photoelectric sensor U1, and the input end of the photoelectric sensor U1 is connected with a power supply voltage Vcc through the current limiting resistor R1;
the voltage comparison unit consists of a voltage division circuit and a double-channel voltage comparator, the voltage division circuit consists of a series circuit which is arranged between the working voltage VDD and the grounding end and consists of resistors R4, R5 and R6, and the double-channel voltage comparator consists of a first voltage comparator U2.1 and a second voltage comparator U2.2; the positive input end of the first voltage comparator U2.1 is connected with the low potential end of the resistor R4, and the reverse input end of the first voltage comparator U2.1 is connected with the output end of the photoelectric sensor U1 through the current limiting resistor R3; the positive input end of the second voltage comparator U2.2 is connected with the output end of the photoelectric sensor U1 through a current limiting resistor R3, and the negative input end of the second voltage comparator U2.2 is connected with the low potential end of the resistor R5; the output ends of the first voltage comparator U2.1 and the second voltage comparator U2.2 are connected to form logic AND output;
the signal amplifying unit comprises a triode Q1, wherein the base electrode of the triode Q1 is connected with the output ends of a first voltage comparator U2.1 and a second voltage comparator U2.2 through a current limiting resistor R8, the collector electrode of the triode Q1 is connected with the signal input end of the singlechip, and is connected with a working voltage VDD through a serial circuit consisting of a resistor R10 and a light emitting diode LED1, and the emitter electrode of the triode Q1 is grounded.
A freewheeling diode D1 is connected in parallel to both ends of the series circuit formed by the resistor R10 and the light emitting diode D1.
The invention has the advantage of being specially designed for detecting the state of the liquid pipeline in the medical detecting instrument. When in use, the photoelectric sensor (groove-shaped photoelectric sensor) is clamped on the peripheral surface of the transparent liquid pipeline, the installation is convenient, the volume is small, the detection precision is high, and the safety guarantee is provided for the diagnosis of patients.
Drawings
Fig. 1 is a schematic diagram of the circuit principle of the present invention.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the accompanying drawings, and the embodiments and specific operation procedures are given by the embodiments of the present invention under the premise of the technical solution of the present invention, but the scope of protection of the present invention is not limited to the following embodiments.
As shown in FIG. 1, the liquid pipeline state detection system comprises a photoelectric sensor detection unit 1, a voltage comparison unit 2, a signal amplification unit and a singlechip 3.
The photoelectric sensor unit 1 comprises a photoelectric sensor U1 with a groove structure and a current limiting resistor R3 connected in series with the output end of the photoelectric sensor U1, the input end of the photoelectric sensor U1 is connected with a power supply voltage Vcc through the current limiting resistor R1, and the resistor R2 plays roles in voltage division and current limiting protection of the photoelectric sensor U1.
The voltage comparison unit 2 consists of a voltage division circuit and a double-channel voltage comparator, the voltage division circuit consists of a series circuit which is arranged between the working voltage VDD and the grounding end and consists of resistors R4, R5 and R6, and the double-channel voltage comparator consists of a first voltage comparator U2.1 and a second voltage comparator U2.2; the positive input end of the first voltage comparator U2.1 is connected with the low potential end of the resistor R4, and the reverse input end of the first voltage comparator U2.1 is connected with the output end of the photoelectric sensor U1 through the current limiting resistor R3; the positive input end of the second voltage comparator U2.2 is connected with the output end of the photoelectric sensor U1 through a current limiting resistor R3, and the negative input end of the second voltage comparator U2.2 is connected with the low potential end of the resistor R5; the output ends of the first voltage comparator U2.1 and the second voltage comparator U2.2 are connected to form logic AND output; the capacitor C1 is connected in parallel to the two ends of the resistor R6, so that noise is filtered, and fluctuation generated by sudden power-on is prevented.
The signal amplifying unit 3 comprises a triode Q1, wherein the base electrode of the triode Q1 is connected with the output ends of the first voltage comparator U2.1 and the second voltage comparator U2.2 through a current limiting resistor R8, the collector electrode of the triode Q1 is connected with the signal input end of the singlechip, and is connected with the working voltage VDD through a series circuit consisting of a resistor R10 and a light emitting diode LED1, and the emitter electrode of the triode Q1 is grounded. In order to protect the light emitting diode D1 when the system is turned off, a freewheeling diode D1 is connected in parallel across the series circuit of the resistor R10 and the light emitting diode D1.
The working principle of the invention is briefly described as follows:
when the voltage at the positive input terminal of the first voltage comparator U2.1 is greater than the voltage at the negative input terminal of the first voltage comparator U2.1, the output terminal of the first voltage comparator U2.1 is at a high level.
When the voltage at the positive input terminal of the first voltage comparator U2.1 is smaller than the voltage at the negative input terminal of the first voltage comparator U2.1, the output terminal of the first voltage comparator U2.1 is at a low level.
When the voltage at the positive input end of the second voltage comparator U2.2 is greater than the voltage at the negative input end of the second voltage comparator U2.2, the output end of the second voltage comparator U2.2 is at a high level.
When the voltage at the positive input terminal of the second voltage comparator U2.2 is smaller than the voltage at the negative input terminal of the second voltage comparator U2.2, the output terminal of the second voltage comparator U2.2 is at a low level.
When the photoelectric sensor U1 is used, the photoelectric sensor U1 with the groove-shaped structure is clamped on a detected transparent liquid pipeline.
When the photoelectric sensor U1 detects that no bubble exists in the liquid pipeline (full liquid passes through), the output end of the photoelectric sensor U1 outputs a level signal UA; after the level signal UA is output to the voltage comparison unit 2 through the resistor R3 to perform constant voltage comparison of logic AND, the base electrode of the high level signal triode Q1 is output, the triode Q1 is driven to be conducted to output a low level signal to the singlechip, and meanwhile the light emitting diode D1 is turned on.
When the photoelectric sensor U1 detects that bubbles in the liquid pipeline pass through, the output end of the photoelectric sensor U1 outputs a level signal UB; the method comprises the steps of carrying out a first treatment on the surface of the After the level signal UB is output to the voltage comparison unit 2 through R3 for logic AND constant voltage comparison, the base electrode of the low level signal triode Q1 is output, the triode Q1 is cut off to output a high level signal to the singlechip, and meanwhile, the light emitting diode D1 is cut off.
The output end OUT_sign outputs high level when the triode Q1 is opened, and the indicator light LED1 is turned off;
the singlechip judges whether the pipeline state is normal or not according to the times of the received high/low level signals, namely the recorded number of bubbles/liquid passing through the photoelectric sensor U1 in a set time period.
For example: when the singlechip detects the state of the sensor once at intervals of 10ms within 1 set period (13.2 s), and the times of detecting the low level is more than or equal to 200 times, the conditions are the same continuously within 3 periods; judging that the pipeline is in a normal state; otherwise, the pipeline is in an abnormal state (blocked or sucked).
Claims (2)
1. A liquid pipeline state detection system, characterized in that: the device comprises a photoelectric sensor detection unit, a voltage comparison unit, a signal amplification unit and a singlechip;
the photoelectric sensor unit comprises a photoelectric sensor U1 and a current limiting resistor R3 connected in series with the output end of the photoelectric sensor U1, and the input end of the photoelectric sensor U1 is connected with a power supply voltage Vcc through the current limiting resistor R1;
the voltage comparison unit consists of a voltage division circuit and a double-channel voltage comparator, the voltage division circuit consists of a series circuit which is arranged between the working voltage VDD and the grounding end and consists of resistors R4, R5 and R6, and the double-channel voltage comparator consists of a first voltage comparator U2.1 and a second voltage comparator U2.2; the positive input end of the first voltage comparator U2.1 is connected with the low potential end of the resistor R4, and the reverse input end of the first voltage comparator U2.1 is connected with the output end of the photoelectric sensor U1 through the current limiting resistor R3; the positive input end of the second voltage comparator U2.2 is connected with the output end of the photoelectric sensor U1 through a current limiting resistor R3, and the negative input end of the second voltage comparator U2.2 is connected with the low potential end of the resistor R5; the output ends of the first voltage comparator U2.1 and the second voltage comparator U2.2 are connected to form logic AND output;
the signal amplifying unit comprises a triode Q1, wherein the base electrode of the triode Q1 is connected with the output ends of a first voltage comparator U2.1 and a second voltage comparator U2.2 through a current limiting resistor R8, the collector electrode of the triode Q1 is connected with the signal input end of the singlechip, and is connected with a working voltage VDD through a serial circuit consisting of a resistor R10 and a light emitting diode LED1, and the emitter electrode of the triode Q1 is grounded.
2. The liquid line condition detection system of claim 1, wherein: a freewheeling diode D1 is connected in parallel to both ends of the series circuit formed by the resistor R10 and the light emitting diode D1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910421821.5A CN110067944B (en) | 2019-05-21 | 2019-05-21 | Liquid pipeline state detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910421821.5A CN110067944B (en) | 2019-05-21 | 2019-05-21 | Liquid pipeline state detecting system |
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| Publication Number | Publication Date |
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| CN110067944A CN110067944A (en) | 2019-07-30 |
| CN110067944B true CN110067944B (en) | 2024-02-23 |
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| CN201910421821.5A Active CN110067944B (en) | 2019-05-21 | 2019-05-21 | Liquid pipeline state detecting system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101571234A (en) * | 2009-06-16 | 2009-11-04 | 北京埃德尔黛威新技术有限公司 | Liquid pressure conduit leak detection device |
| CN202648900U (en) * | 2012-05-16 | 2013-01-02 | 硅密（常州）电子设备有限公司 | Leakage detection circuit of heating groove |
| US8749393B1 (en) * | 2011-02-14 | 2014-06-10 | Control Air Conditioning Corporation | Water leak detection and shut-off method and apparatus using differential flow rate sensors |
| CN207778042U (en) * | 2017-12-29 | 2018-08-28 | 泸州太昌能源有限公司 | Natural gas air pressure on-line measuring device |
| CN108986417A (en) * | 2018-05-31 | 2018-12-11 | 新乡市华西卫材有限公司 | The warning device of material curtain coating compounding machine is defended in medical treatment |
| CN210088475U (en) * | 2019-05-21 | 2020-02-18 | 安图实验仪器(郑州)有限公司 | Liquid pipeline state detection system |
-
2019
- 2019-05-21 CN CN201910421821.5A patent/CN110067944B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101571234A (en) * | 2009-06-16 | 2009-11-04 | 北京埃德尔黛威新技术有限公司 | Liquid pressure conduit leak detection device |
| US8749393B1 (en) * | 2011-02-14 | 2014-06-10 | Control Air Conditioning Corporation | Water leak detection and shut-off method and apparatus using differential flow rate sensors |
| CN202648900U (en) * | 2012-05-16 | 2013-01-02 | 硅密（常州）电子设备有限公司 | Leakage detection circuit of heating groove |
| CN207778042U (en) * | 2017-12-29 | 2018-08-28 | 泸州太昌能源有限公司 | Natural gas air pressure on-line measuring device |
| CN108986417A (en) * | 2018-05-31 | 2018-12-11 | 新乡市华西卫材有限公司 | The warning device of material curtain coating compounding machine is defended in medical treatment |
| CN210088475U (en) * | 2019-05-21 | 2020-02-18 | 安图实验仪器(郑州)有限公司 | Liquid pipeline state detection system |
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| Publication number | Publication date |
|---|---|
| CN110067944A (en) | 2019-07-30 |
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Country or region after: China Address after: 450016 No.199, Jingkai 15th Street, Zhengzhou Economic and Technological Development Zone, Henan Province Applicant after: AUTOBIO LABTEC INSTRUMENTS Co.,Ltd. Address before: No. 199, 15th Street, economic and Technological Development Zone, Zhengzhou City, Henan Province Applicant before: AUTOBIO LABTEC INSTRUMENTS Co.,Ltd. Country or region before: China |
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