CN105299462A - High-precision liquid nitrogen liquid-level measurement system - Google Patents
High-precision liquid nitrogen liquid-level measurement system Download PDFInfo
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- CN105299462A CN105299462A CN201510830389.7A CN201510830389A CN105299462A CN 105299462 A CN105299462 A CN 105299462A CN 201510830389 A CN201510830389 A CN 201510830389A CN 105299462 A CN105299462 A CN 105299462A
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Abstract
The invention discloses a high-precision liquid nitrogen liquid-level measurement system. The high-precision liquid nitrogen liquid-level measurement system comprises a liquid nitrogen container and a liquid level gauge, wherein the liquid level gauge comprises a main processor and a differential pressure transducer, the signal output end of the differential pressure transducer is connected with the signal input end of the main processor through a signal conditioning circuit, the signal output end of the main processor controls and is connected with the differential pressure transducer through a zero setting circuit and a full-scale setting circuit respectively, and the signal output end of the main processor is also connected with a man-machine interaction module, a signal output terminal and an alarm output terminal; and the bottom of the liquid nitrogen container is connected with the differential pressure transducer of the liquid level gauge through a measurement connecting pipeline, a pressure relief valve is connected to the side wall of the upper part of the liquid nitrogen container, the other end of the pressure relief valve is communicated with the atmosphere, and the signal output terminal connected with the main processor controls and is connected with the pressure relief valve. The device, by adopting a differential pressure type liquid level measurement process, converts differential pressure to the height of measured liquid according to a formula and determines the height of the liquid level through measuring pressure difference by the differential pressure transducer. The measurement precision is high.
Description
Technical field
The present invention relates to liquid nitrogen storage and operation technique field, especially a kind of highi degree of accuracy liquid nitrogen liquid level measuring system, for continuous measurement liquid nitrogen liquid level.
Background technique
Liquid nitrogen, liquid nitrogen.Inertia, colourless, odorless, non-corrosiveness, non-combustible, at ambient pressure, liquid nitrogen temperature is-196 DEG C; Liquid nitrogen is of many uses, can quick freeze and transporting food products, or makes Ice; Low temperature physics research can be carried out; Temperature needed for high temperature superconductor superconduct can be provided; Can be used to preserve biological tissue, biological sample and sperm and ovum; Can refrigeration agent be made, be used for quick freeze biological tissue, prevent tissue to be destroyed.The low-temperature (low temperature) vessel storing liquid nitrogen is in actual applications nontransparent, and liquid level is difficult to distinguish, is difficult to the liquid level height grasping liquid nitrogen in container in time.The liquid level height of liquid nitrogen for ensureing that good low temperature environment is very important, in order to realize the detection to liquid nitrogen fluid level condition, need a kind of highi degree of accuracy, can the measuring system of continuous measurement liquid nitrogen liquid level.
The metering system of current liquid nitrogen liquid level can be divided into continuous measurement and position formula to measure (discontinuous) two large class by time domain.As number of patent application is: 200610011627.2(is used for the liquid nitrogen liquid level emasuring device of high voltage superconducting power apparatus) just belong to a formula measurement, its measuring accuracy depends on the density that scale bar and sensor are arranged, can not reach the requirement that continuous precise is measured.Also have the mode of serviceability temperature indirect inspection liquid nitrogen liquid level, as number of patent application is: 201510107745.2(liquid nitrogen level monitoring system), belong to a formula equally and measure, there is the deficiency that a formula is measured.To have in the mode of continuous measurement and use ultrasonic wave measuring method, as number of patent application is: 201420839060.8(mono-kind is based on the long-range liquid nitrogen level monitoring system of GPRS), ultrasound is for responsive to temperature, temperature correction will be carried out in actual use, ambient temperature accurately need be recorded, be difficult to accomplish high-acruracy survey.Also have and use differential pressure transmitter to measure, as number of patent application is: 201420253251.6(liquid nitrogen level monitoring system), the liquid phase gas of liquid nitrogen side can only being accessed, when there being a small amount of liquid nitrogen to enter sensor side, will measuring accuracy be affected.
Summary of the invention
The object of the invention is exactly the defect in order to make up prior art, a kind of highi degree of accuracy liquid nitrogen liquid level measuring system is provided, system possesses sensor zeroing, full scale is selected, land used gravity accleration is compensated, liquid nitrogen side liquid phase gas and liquid nitrogen all can pass into, and when filling liquid nitrogen pressure is excessive, dynamic measurement still can ensure high-precision ability.
The present invention is achieved by the following technical solutions:
A kind of highi degree of accuracy liquid nitrogen liquid level measuring system, include liquid nitrogen container, liquid level measurer, it is characterized in that: described liquid level measurer comprises primary processor, differential pressure transducer, the signal output part of differential pressure transducer is connected with the signal input part of primary processor by signal conditioning circuit, the signal output part of primary processor arranges circuit and differential pressure transducer control connection respectively by zeroing circuit, full scale, and the signal output part of primary processor is also connected with human-computer interaction module, signal output terminal, warning Out let; The bottom of described liquid nitrogen container is connected with the differential pressure transducer of liquid level measurer by measuring connecting tube, the upper portion side wall of liquid nitrogen container is connected with purge valve, the other end of purge valve is communicated with air, the signal output terminal that primary processor connects and purge valve control connection.
Described a kind of highi degree of accuracy liquid nitrogen liquid level measuring system, it is characterized in that: described zeroing circuit comprises control valve, threeway, one end of control valve is connected with liquid nitrogen container, one end is communicated with differential pressure transducer, one end is communicated with threeway, differential pressure transducer is communicated with threeway, and the other end of threeway is directly communicated with air.
Advantage of the present invention is:
Apparatus of the present invention adopt differential pressure type level method of measurement, according to formula, pressure reduction are converted into the height of fluid to be measured, and measure by differential pressure transducer the height that pressure reduction determines liquid level, measuring accuracy is high.
Accompanying drawing explanation
Fig. 1 is the connection diagram of the present invention and liquid nitrogen container.
Fig. 2 is system block diagram of the present invention.
Fig. 3 is the theory diagram of differential pressure transducer zeroing circuit of the present invention.
Embodiment
As Figure 1-3, a kind of highi degree of accuracy liquid nitrogen liquid level measuring system, include liquid nitrogen container 1, liquid level measurer 2, liquid level measurer 2 comprises primary processor 5, differential pressure transducer 6, the signal output part of differential pressure transducer 6 is connected with the signal input part of primary processor 5 by signal conditioning circuit 7, the signal output part of primary processor 5 arranges circuit 9 and differential pressure transducer 6 control connection respectively by zeroing circuit 8, full scale, and the signal output part of primary processor 5 is also connected with human-computer interaction module 10, signal output terminal 11, warning Out let 12; The bottom of liquid nitrogen container 1 is connected with the differential pressure transducer 6 of liquid level measurer 2 by measuring connecting tube 3, the upper portion side wall of liquid nitrogen container 1 is connected with purge valve 4, the other end of purge valve 4 is communicated with air, signal output terminal 11 and purge valve 4 control connection that primary processor 5 connects.
As Fig. 1, measure connecting tube 3 and be connected with liquid level measurer 2 bottom of liquid nitrogen container 1, object is the differential pressure transducer one end of liquid phase gas or liquid nitrogen being introduced in liquid level measurer 2, wherein measures the shorter measuring accuracy of connecting tube 3 higher.
Purge valve 4 is installed on the top of liquid nitrogen container 1, and side is communicated with liquid nitrogen container 1, and opposite side is communicated with air, and its unlatching is subject to the control of liquid level measurer 2.When liquid nitrogen container 1 liquid filling pressure is excessive, the liquid nitrogen pressure after ullage evaporation can raise, and level measurement can be made to fluctuate.Effectively can reduce the pressure of liquid nitrogen ullage after opening purge valve 4, improve measuring accuracy.
As Fig. 2, primary processor 5 completes all computings of native system and operational processes task.Differential pressure transducer 6 side is connected with tested liquid nitrogen, and opposite side is connected with air.The signal condition that differential pressure transducer 6 exports by signal conditioning circuit 7 is the electrical signal that primary processor 5 needs.Zeroing circuit 8 be used for return to zero differential pressure transducer 6, eliminate sensor zero drift for measure impact.Full scale arranges 9 and is used for arranging the value closest to required range, in order to improve measuring accuracy.Human-computer interaction module 10 is used for showing level measurement, arranges alarming value, arranges gravity acceleration value, completes full scale selection, zeroing operation, purge valve control operation.The level value recorded can be converted to voltage, electric current or digital signal and export by signal output terminal 11, and the control signal of exportable purge valve 4.Warning Out let 12 is used for output alarm state.
As Fig. 3, zeroing circuit comprises control valve 12, threeway 13, and control valve 12 one end is connected with tested liquid nitrogen, and one end is connected with differential pressure transducer 6, and one end is connected with threeway 13.Differential pressure transducer 6 wherein one end is connected with threeway 13.Threeway 13 wherein one end is directly connected with air.When needs zeroing differential pressure transducer 6, air is accessed one end of differential pressure transducer 2 by control valve 3, and now the two ends of differential pressure transducer 2 are communicated with air simultaneously, and system records the output of differential pressure transducer 2 automatically, reaches zeroing object.When measuring liquid level, control valve 3 is by one end of tested liquid nitrogen access differential pressure transducer 2, and the other end of differential pressure transducer 2 is still and is communicated with air, reaches the effect utilizing pressure difference to measure liquid level.
Claims (2)
1. a highi degree of accuracy liquid nitrogen liquid level measuring system, include liquid nitrogen container, liquid level measurer, it is characterized in that: described liquid level measurer comprises primary processor, differential pressure transducer, the signal output part of differential pressure transducer is connected with the signal input part of primary processor by signal conditioning circuit, the signal output part of primary processor arranges circuit and differential pressure transducer control connection respectively by zeroing circuit, full scale, and the signal output part of primary processor is also connected with human-computer interaction module, signal output terminal, warning Out let; The bottom of described liquid nitrogen container is connected with the differential pressure transducer of liquid level measurer by measuring connecting tube, the upper portion side wall of liquid nitrogen container is connected with purge valve, the other end of purge valve is communicated with air, the signal output terminal that primary processor connects and purge valve control connection.
2. a kind of highi degree of accuracy liquid nitrogen liquid level measuring system according to claim 1, it is characterized in that: described zeroing circuit comprises control valve, threeway, one end of control valve is connected with liquid nitrogen container, one end is communicated with differential pressure transducer, one end is communicated with threeway, differential pressure transducer is communicated with threeway, and the other end of threeway is directly communicated with air.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510830389.7A CN105299462A (en) | 2015-11-24 | 2015-11-24 | High-precision liquid nitrogen liquid-level measurement system |
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| CN201510830389.7A CN105299462A (en) | 2015-11-24 | 2015-11-24 | High-precision liquid nitrogen liquid-level measurement system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402645A (en) * | 2016-11-23 | 2017-02-15 | 西南交通大学 | Automatic replenishment method and system for vehicle-mounted dewar liquid nitrogen of superconduction magnetic levitation vehicle |
| WO2018175103A1 (en) * | 2017-03-21 | 2018-09-27 | Cryterion Medical, Inc. | Fluid container measurement and replacement system |
| CN109099310A (en) * | 2018-08-16 | 2018-12-28 | 湖北三江航天江北机械工程有限公司 | LNG storage tank prizes inner storage tank liquid level detection system and method |
| CN109655131A (en) * | 2018-12-29 | 2019-04-19 | 上海齐耀动力技术有限公司 | A kind of low-temperature (low temperature) vessel differential pressure type level gauge liquid phase pipeline experimental system visualizing |
| CN114458947A (en) * | 2022-02-09 | 2022-05-10 | 广东电网有限责任公司 | Operation and maintenance method and device of superconducting power system and superconducting power integrated system |
| US11596776B2 (en) | 2017-03-21 | 2023-03-07 | Boston Scientific Scimed, Inc. | Fluid container replacement system and method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402645A (en) * | 2016-11-23 | 2017-02-15 | 西南交通大学 | Automatic replenishment method and system for vehicle-mounted dewar liquid nitrogen of superconduction magnetic levitation vehicle |
| WO2018175103A1 (en) * | 2017-03-21 | 2018-09-27 | Cryterion Medical, Inc. | Fluid container measurement and replacement system |
| US11596776B2 (en) | 2017-03-21 | 2023-03-07 | Boston Scientific Scimed, Inc. | Fluid container replacement system and method |
| CN109099310A (en) * | 2018-08-16 | 2018-12-28 | 湖北三江航天江北机械工程有限公司 | LNG storage tank prizes inner storage tank liquid level detection system and method |
| CN109099310B (en) * | 2018-08-16 | 2020-05-19 | 湖北三江航天江北机械工程有限公司 | Liquid level detection system and method for LNG storage tank prizing inner storage tank |
| CN109655131A (en) * | 2018-12-29 | 2019-04-19 | 上海齐耀动力技术有限公司 | A kind of low-temperature (low temperature) vessel differential pressure type level gauge liquid phase pipeline experimental system visualizing |
| CN114458947A (en) * | 2022-02-09 | 2022-05-10 | 广东电网有限责任公司 | Operation and maintenance method and device of superconducting power system and superconducting power integrated system |
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Application publication date: 20160203 |
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