CN105181083A - Liquid level monitoring system of liquid nitrogen filling device - Google Patents
Liquid level monitoring system of liquid nitrogen filling device Download PDFInfo
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- CN105181083A CN105181083A CN201510416751.6A CN201510416751A CN105181083A CN 105181083 A CN105181083 A CN 105181083A CN 201510416751 A CN201510416751 A CN 201510416751A CN 105181083 A CN105181083 A CN 105181083A
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Abstract
The present invention discloses a liquid level monitoring system of a liquid nitrogen filling device, and belongs to the technical field of medical detecting instruments. The system comprises an ultrasonic liquid level instrument, a liquid level display, a central processing unit and an alarm device, wherein the ultrasonic liquid level instrument, the central processing unit and the liquid level display are connected in turn, the alarm device is connected with the central processing unit, and the ultrasonic liquid level instrument is used for measuring a liquid level of the liquid nitrogen filling device, and comprises a micro processor, a first ultrasonic measurement device and a second ultrasonic measurement device. The system can accurately monitor the liquid level of liquid nitrogen in the liquid nitrogen filling device and display the liquid level in real time, thereby providing convenience for clinic workers to rapidly and safely acquire liquid level data of the liquid nitrogen.
Description
Technical field
The present invention relates to a kind of liquid nitrogen filling apparatus level monitoring system, belong to medicine detector device technical field.
Background technology
Liquid nitrogen is a kind of colourless, tasteless liquid, is refrigerant the most frequently used at present, is widely used in clinical medicine domain.In NMR system, in order to ensure the normal work of high-temperature superconductor radio-frequency coil, usually carrying out filling liquid nitrogen with liquid nitrogen pump, utilizing liquid nitrogen vaporization to absorb heat and reaching the effect of cooling.When liquid nitrogen container inner capacities is not enough, need to supplement liquid nitrogen in time.
Application number is 201120352592.5, the applying date is that the utility model on September 20th, 2011 discloses a kind of liquid level monitor of liquid nitrogen container, external liquid level sensor, comprise circuit main board, central processing unit, sensor interface and display screen, described central processing unit, described sensor interface and described display screen are installed on described circuit main board, described sensor interface is multiple, the outer end of described sensor interface and the signal output part of described liquid level sensor connect one to one, the inner of described sensor interface and the signal input part of described central processing unit connect one to one, the signal input part of described display screen is connected with the VT of described central processing unit.Liquid level signal in the liquid nitrogen container that liquid level sensor is sensed by sensor interface by this utility model passes to central processing unit, display screen is sent to after the data of central processing unit are changed, contrast, analyze and classified, user accurately, at large can understand the level condition in liquid nitrogen container by display screen, for user's decision-making provides foundation.
Application number is 201310028049.3, the applying date is that the application for a patent for invention on January 24th, 2013 discloses a kind of liquid nitrogen liquid level indicator, is made up of hts band (1), well heater (2), support baseboard (3), support cover plate (4), primary power (5), heater power source (6), measurement lead-in wire (7) and current feed (8).The two ends of hts band (1) are connected with negative pole with the positive pole of primary power (5) respectively by current feed (8).The two ends of hts band (1) are also connected with a pair measurement lead-in wire (7).Well heater (2) is connected by the positive and negative polarities of current feed (8) with heater power source (6).Primary power (5) and heater power source (6) are direct supply.The one side of hts band (1) adheres on support baseboard (3), and another side is pasted with well heater (2).Support cover plate (4) to adhere on support baseboard (3).Well heater (2) and hts band (1) are positioned at support baseboard (3) and support between cover plate (4).
Application number is 201410226026.8, the applying date is that the application for a patent for invention on May 26th, 2014 discloses a kind of liquid nitrogen charging machine with level sensing control device, comprise liquid nitrogen conveying vacuum tube, liquid nitrogen input pipe, liquid nitrogen stores courage and liquid nitrogen shower nozzle, liquid nitrogen conveying vacuum tube comprise for the tank connected horizontal liquid nitrogen ascending pipe of liquid nitrogen and longitudinal liquid nitrogen ascending pipe connected vertically with horizontal liquid nitrogen ascending pipe, longitudinal liquid nitrogen ascending pipe upper end is also installed and is fixed a cylinder, this Telescopic-cylinder bar is connected with operation valve, Telescopic-cylinder bar and operation valve device are in longitudinal liquid nitrogen ascending pipe, the courage shell upper end that its liquid nitrogen stores courage is mounted with temperature sensor by temperature sensor holder, and temperature sensor stretches to inner bag and contacts with liquid nitrogen, and described temperature sensor is connected with cylinder by external control system, the relatively existing liquid nitrogen charging machine of this invention controls liquid nitrogen addition by floating ball device, has liquid nitrogen filling and controls the advantages such as convenient, automaticity is high, control accuracy is high and breakdown maintenance is convenient.
Though above-mentioned liquid nitrogen Technology of Level Detection respectively has advantage, the precision detected is not high.
Summary of the invention
In order to solve the problem, the present invention proposes a kind of liquid nitrogen filling apparatus level monitoring system, the height of liquid nitrogen liquid level in liquid nitrogen filling apparatus can be detected accurately, and can show in real time.
The present invention adopts following technical scheme for solving its technical matters:
A kind of liquid nitrogen filling apparatus level monitoring system, comprise ultrasonic liquid leveller, liquid level display, central processing unit and warning device, be linked in sequence comprising ultrasonic liquid leveller, central processing unit and liquid level display, warning device is connected with central processing unit;
Described ultrasonic liquid leveller for measuring the liquid level of liquid nitrogen filling apparatus,
Comprise microprocessor, for sending the first pulse signal and the second pulse signal, and receive the first pulse echo signal and the second pulse echo signal, and determine the actual sonic transmissions speed in described liquid nitrogen filling apparatus according to the very first time difference between the first pulse echo signal received and the first pulse signal of transmission, and determine the level value of described middle liquid nitrogen filling apparatus according to the second mistiming between reception second pulse echo signal and the second pulse signal of transmission and described actual sonic transmissions speed;
First ultrasonic measuring device, for receive microprocessor send the first pulse signal after, send the first ultrasonic signal, and after receiving first ultrasound echo signal corresponding with the first ultrasonic signal, described first pulse echo signal of corresponding generation, is sent to microprocessor by the first pulse echo signal simultaneously; Described very first time difference is the first ultrasonic signal and the transmission time of the first ultrasound echo signal in liquid nitrogen filling apparatus;
Second ultrasonic measuring device, for receive microprocessor send the second pulse signal after, send the second ultrasonic signal, and after receiving second ultrasound echo signal corresponding with the second ultrasonic signal, corresponding generation the second pulse echo signal, and the second pulse echo signal is sent to described microprocessor; Described second mistiming is the second ultrasonic signal and the transmission time of the second ultrasound echo signal in liquid nitrogen filling apparatus.
As a preferred technical solution of the present invention: described first ultrasonic measuring device comprises the first ultrasonic transmit circuit, the first ultrasound wave receiving circuit, wherein microprocessor, the first ultrasonic transmit circuit and the first ultrasound wave receiving circuit are linked in sequence, and the first ultrasound wave receiving circuit is connected with microprocessor.
As a preferred technical solution of the present invention: described first ultrasonic transmit circuit is made up of TTL not circuit; The single-shot trigger circuit that first ultrasound wave receiving circuit forms with NE555 is for core.
As a preferred technical solution of the present invention: described liquid level display adopts light-emitting diode display.
As a preferred technical solution of the present invention: described warning device is audible-visual annunciator.
A kind of liquid nitrogen filling apparatus level monitoring system of the present invention, adopts above technical scheme compared with prior art, has following technique effect:
(1) the present invention adopts ultrasonic detecting technology to detect the height of liquid nitrogen liquid level in liquid nitrogen filling apparatus, and precision is high, pollution-free, noncontact.
(2) the present invention is very directly perceived to the reading of liquid nitrogen liquid level in liquid nitrogen filling apparatus, for clinical staff fast and the acquisition liquid nitrogen liquid level data of safety is provided convenience.
(3) the present invention is provided with warning device, once liquid nitrogen capacity lower than preset value, then sends warning message and reminds medical worker to supplement liquid nitrogen in time in liquid nitrogen filling apparatus.
Embodiment
Be described in further details below in conjunction with to the invention.
A kind of liquid nitrogen filling apparatus level monitoring system, comprise ultrasonic liquid leveller, liquid level display, central processing unit and warning device, be linked in sequence comprising ultrasonic liquid leveller, central processing unit and liquid level display, warning device is connected with central processing unit;
Described ultrasonic liquid leveller for measuring the liquid level of liquid nitrogen filling apparatus,
Comprise microprocessor, for sending the first pulse signal and the second pulse signal, and receive the first pulse echo signal and the second pulse echo signal, and determine the actual sonic transmissions speed in described liquid nitrogen filling apparatus according to the very first time difference between the first pulse echo signal received and the first pulse signal of transmission, and determine the level value of described middle liquid nitrogen filling apparatus according to the second mistiming between reception second pulse echo signal and the second pulse signal of transmission and described actual sonic transmissions speed;
First ultrasonic measuring device, for receive microprocessor send the first pulse signal after, send the first ultrasonic signal, and after receiving first ultrasound echo signal corresponding with the first ultrasonic signal, described first pulse echo signal of corresponding generation, is sent to microprocessor by the first pulse echo signal simultaneously; Described very first time difference is the first ultrasonic signal and the transmission time of the first ultrasound echo signal in liquid nitrogen filling apparatus;
Second ultrasonic measuring device, for receive microprocessor send the second pulse signal after, send the second ultrasonic signal, and after receiving second ultrasound echo signal corresponding with the second ultrasonic signal, corresponding generation the second pulse echo signal, and the second pulse echo signal is sent to described microprocessor; Described second mistiming is the second ultrasonic signal and the transmission time of the second ultrasound echo signal in liquid nitrogen filling apparatus.
As a preferred technical solution of the present invention: described first ultrasonic measuring device comprises the first ultrasonic transmit circuit, the first ultrasound wave receiving circuit, wherein microprocessor, the first ultrasonic transmit circuit and the first ultrasound wave receiving circuit are linked in sequence, and the first ultrasound wave receiving circuit is connected with microprocessor.
As a preferred technical solution of the present invention: described first ultrasonic transmit circuit is made up of TTL not circuit; The single-shot trigger circuit that first ultrasound wave receiving circuit forms with NE555 is for core.
As a preferred technical solution of the present invention: described liquid level display adopts light-emitting diode display.
As a preferred technical solution of the present invention: described warning device is audible-visual annunciator.
The present invention adopts ultrasonic detecting technology, and detect the height of liquid nitrogen liquid level in liquid nitrogen filling apparatus, precision is high, pollution-free, noncontact.
Ultrasonic detection technology is the very important measure of one in society technical field of nondestructive testing, has been widely used in quality monitoring and the safety guarantee of all trades and professions.The frequency range of the sound wave that usual people's ear can be heard is between 20-20000Hz, and people call ultrasound wave frequency more than the sound wave of 20KHz traditionally.
The speed of sound wave forward direction in media as well, is called the velocity of sound.For different types of ultrasound wave, its velocity of propagation is different.Ultrasound wave velocity of propagation is in media as well relevant with the elastic modulus of medium and the density of medium, and to certain medium, elastic modulus and density are constant, therefore the velocity of sound is also constant.Different media, has the different velocities of sound.When ultrasound wave waveform is different, the mode of dielectric resilient distortion is different, and speed is also different.Therefore, the speed that ultrasound wave is propagated in media as well is the important parameter characterizing medium acoustic characteristic.Hyperacoustic frequency, relation between wavelength and the velocity of sound are as follows:
Wherein,
for hyperacoustic wavelength,
for ultrasound wave in media as well velocity of wave,
for hyperacoustic frequency.Visible, in same medium, hyperacoustic wavelength and hyperacoustic frequency are inversely proportional to.
Principle of the present invention is as follows: by test fluid flowing to the work of supersonic beam (or ultrasonic pulse) in order to measuring flow.Namely time difference type measuring principle is adopted: a probe transmits through after tube wall, medium, opposite side tube wall, received by another probe, simultaneously, second probe transmits equally and to be received by first probe, owing to being subject to the impact of velocity of medium, the two life period difference Δ t, according to calculating conversion relation V=(the C2/2L) × Δ t that can draw between flow velocity V and mistiming Δ t, and then can obtain flow value Q.
Principle of the present invention is a kind of contactless measurement, and the rate-of flow that it both can measure Large Diameter Pipeline also may be used for the measurement of the medium not easily contacting and observe.Its accuracy of measurement is very high, hardly by the interference of various parameters of measured medium, especially can solve other instrument can not the flow measurement problem of severe corrosive, non-conductive, radioactivity and inflammable and explosive medium.
The present invention is provided with warning device, once liquid nitrogen capacity lower than preset value, then sends warning message and reminds medical worker to supplement liquid nitrogen in time in liquid nitrogen filling apparatus.The present invention is very directly perceived to the reading of liquid nitrogen liquid level in liquid nitrogen filling apparatus, for clinical staff fast and the acquisition liquid nitrogen liquid level data of safety is provided convenience.
Embodiment one:
In use can squeeze into air due to liquid nitrogen filling apparatus is liquid nitrogen container supercharging, and the temperature of itself in device is changed, the accuracy therefore in order to measure need redefine the actual sonic transmissions speed in liquid nitrogen filling apparatus thus ensure the accuracy of level gauging.Use ultrasonic liquid leveller to measure the liquid level of liquid nitrogen filling apparatus, first microprocessor sends the first pulse signal, and record sends the time of described first pulse signal; First ultrasonic measuring device is after the first pulse signal receiving the transmission of described microprocessor, send the first ultrasonic signal, and after receiving first ultrasound echo signal corresponding with the first ultrasonic signal, corresponding generation the first pulse echo signal, and the first pulse echo signal is sent to microprocessor; Described microprocessor is according to receiving described first pulse echo signal and sending the very first time poor actual sonic transmissions speed determined in liquid nitrogen filling apparatus between described first pulse signal; Described very first time difference is described first ultrasonic signal and the transmission time of described first ultrasound echo signal in described liquid nitrogen filling apparatus; Described microprocessor sends the second pulse signal, and records the time of transmission second pulse signal; Be arranged on diapire outside surface second ultrasonic measuring device of described liquid nitrogen filling apparatus after receiving described second pulse signal of microprocessor transmission, send the second ultrasonic signal, and after receiving second ultrasound echo signal corresponding with the second ultrasonic signal, corresponding generation the second pulse echo signal, and the second pulse echo signal is sent to microprocessor; Described second mistiming is the second ultrasonic signal and the transmission time of the second ultrasound echo signal in liquid nitrogen filling apparatus; The level value in described liquid nitrogen filling apparatus determined by microprocessor according to the second mistiming received between described second pulse echo signal and transmission the second pulse signal and described actual sonic transmissions speed.
Above embodiments of the present invention are explained in detail, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, can also makes a variety of changes under the prerequisite not departing from present inventive concept.
Claims (5)
1. a liquid nitrogen filling apparatus level monitoring system, comprise ultrasonic liquid leveller, liquid level display, central processing unit and warning device, be linked in sequence comprising ultrasonic liquid leveller, central processing unit and liquid level display, warning device is connected with central processing unit;
It is characterized in that described ultrasonic liquid leveller is for measuring the liquid level of liquid nitrogen filling apparatus, comprises
Microprocessor, for sending the first pulse signal and the second pulse signal, and receive the first pulse echo signal and the second pulse echo signal, and determine the actual sonic transmissions speed in described liquid nitrogen filling apparatus according to the very first time difference between the first pulse echo signal received and the first pulse signal of transmission, and determine the level value of described middle liquid nitrogen filling apparatus according to the second mistiming between reception second pulse echo signal and the second pulse signal of transmission and described actual sonic transmissions speed;
First ultrasonic measuring device, for receive microprocessor send the first pulse signal after, send the first ultrasonic signal, and after receiving first ultrasound echo signal corresponding with the first ultrasonic signal, described first pulse echo signal of corresponding generation, is sent to microprocessor by the first pulse echo signal simultaneously; Described very first time difference is the first ultrasonic signal and the transmission time of the first ultrasound echo signal in liquid nitrogen filling apparatus;
Second ultrasonic measuring device, for receive microprocessor send the second pulse signal after, send the second ultrasonic signal, and after receiving second ultrasound echo signal corresponding with the second ultrasonic signal, corresponding generation the second pulse echo signal, and the second pulse echo signal is sent to described microprocessor; Described second mistiming is the second ultrasonic signal and the transmission time of the second ultrasound echo signal in liquid nitrogen filling apparatus.
2. a kind of liquid nitrogen filling apparatus level monitoring system according to claim 1, it is characterized in that described first ultrasonic measuring device comprises the first ultrasonic transmit circuit, the first ultrasound wave receiving circuit, wherein microprocessor, the first ultrasonic transmit circuit and the first ultrasound wave receiving circuit are linked in sequence, and the first ultrasound wave receiving circuit is connected with microprocessor.
3. a kind of liquid nitrogen filling apparatus level monitoring system according to claim 2, is characterized in that described first ultrasonic transmit circuit is made up of TTL not circuit; The single-shot trigger circuit that first ultrasound wave receiving circuit forms with NE555 is for core.
4. a kind of liquid nitrogen filling apparatus level monitoring system according to claim 1, is characterized in that described liquid level display adopts light-emitting diode display.
5. a kind of liquid nitrogen filling apparatus level monitoring system according to claim 1, is characterized in that described warning device is audible-visual annunciator.
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| CN201510416751.6A CN105181083A (en) | 2015-07-16 | 2015-07-16 | Liquid level monitoring system of liquid nitrogen filling device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109374090A (en) * | 2018-10-23 | 2019-02-22 | 西南交通大学 | A kind of level monitoring system based on ultrasound |
| CN114680546A (en) * | 2016-08-19 | 2022-07-01 | 贝勒努斯管理有限公司 | System for monitoring fluid intake of a user and method of operating a system |
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| US20140250986A1 (en) * | 2010-11-11 | 2014-09-11 | Ssi Technologies, Inc. | Systems and methods of determining a quality and a quantity of a fluid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114680546A (en) * | 2016-08-19 | 2022-07-01 | 贝勒努斯管理有限公司 | System for monitoring fluid intake of a user and method of operating a system |
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Application publication date: 20151223 |