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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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 184
- 239000007788 liquid Substances 0.000 title claims abstract description 157
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 92
- 238000012544 monitoring process Methods 0.000 title claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 28
- 230000005540 biological transmission Effects 0.000 claims description 19
- 230000000007 visual effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 description 8
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 239000000523 sample Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
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 invention relates to a liquid level monitoring system of a liquid nitrogen filling device, and belongs to the technical field of medical detection instruments.
Background
Liquid nitrogen is a colorless and odorless liquid, is the most common refrigerant at present, and is widely applied to the field of clinical medicine. In a nuclear magnetic resonance system, in order to ensure the normal operation of a high-temperature superconducting radio frequency coil, a liquid nitrogen pump is generally used for filling liquid nitrogen, and the liquid nitrogen is used for vaporizing and absorbing heat to achieve the effect of cooling. When the capacity in the liquid nitrogen tank is insufficient, the liquid nitrogen needs to be supplemented in time.
Application number is 201120352592.5, and application date is 2011 utility model of 9 months 20 days discloses a liquid nitrogen container liquid level monitor, external level sensor, including circuit board, central processing unit, sensor interface and display screen, central processing unit the sensor interface with the display screen is all installed on the circuit board, the sensor interface is a plurality of, the outer end of sensor interface with level sensor's signal output part one-to-one is connected, the inner of sensor interface with central processing unit's signal input part one-to-one is connected, the signal input part of display screen with central processing unit's video signal output part connects. The utility model discloses a liquid level signal transmission in the liquid nitrogen container that senses liquid level sensor through the sensor interface gives central processing unit, sends for the display screen after central processing unit's data conversion, contrast, analysis and classification, and the user can know the liquid level condition in the liquid nitrogen container through the display screen accurately, exhaustively, provides the foundation for the user decision-making.
The invention patent application with the application number of 201310028049.3 and the application date of 2013, 1 month and 24 days discloses a liquid nitrogen level gauge, which consists of a high-temperature superconducting tape (1), a heater (2), a supporting bottom plate (3), a supporting cover plate (4), a main power supply (5), a heater power supply (6), a measuring lead (7) and a current lead (8). Two ends of the high-temperature superconducting tape (1) are respectively connected with the anode and the cathode of the main power supply (5) through current leads (8). And a pair of measuring leads (7) are connected to two ends of the high-temperature superconducting tape (1). The heater (2) is connected with the positive pole and the negative pole of a heater power supply (6) through a current lead (8). The main power supply (5) and the heater power supply (6) are both direct current power supplies. One side of the high-temperature superconducting tape (1) is adhered to the supporting base plate (3), and the other side is adhered with the heater (2). The supporting cover plate (4) is adhered to the supporting base plate (3). The heater (2) and the high-temperature superconducting tape (1) are positioned between the supporting base plate (3) and the supporting cover plate (4).
The invention patent application with the application number of 201410226026.8 and the application date of 2014, 5, 26 discloses a liquid nitrogen filling machine with a liquid level detection control device, which comprises a liquid nitrogen conveying vacuum tube, a liquid nitrogen input tube, a liquid nitrogen storage liner and a liquid nitrogen spray head, wherein the liquid nitrogen conveying vacuum tube comprises a transverse liquid nitrogen injection tube and a longitudinal liquid nitrogen injection tube, the transverse liquid nitrogen injection tube is used for being connected with a liquid nitrogen tank, the longitudinal liquid nitrogen injection tube is vertically connected with the transverse liquid nitrogen injection tube, the upper end of the longitudinal liquid nitrogen injection tube is also fixedly provided with an air cylinder, the telescopic rod of the air cylinder is connected with a control valve, and the telescopic rod of the air; the upper end of a liner shell of the liquid nitrogen storage liner is fixedly provided with a temperature sensor through a temperature sensor fixing seat, the temperature sensor extends into the liner to be contacted with liquid nitrogen, and the temperature sensor is connected with the cylinder through an external control system; compared with the existing liquid nitrogen filling machine, the liquid nitrogen filling machine controls the liquid nitrogen adding amount through the floating ball device, and has the advantages of convenience in liquid nitrogen filling control, high automation degree, high control precision, convenience in fault maintenance and the like.
The liquid nitrogen level detection technology has advantages, but the detection precision is not high.
Disclosure of Invention
In order to solve the problems, the invention provides a liquid level monitoring system of a liquid nitrogen filling device, which can accurately detect the liquid level of liquid nitrogen in the liquid nitrogen filling device and can display the liquid level in real time.
The invention adopts the following technical scheme for solving the technical problems:
a liquid level monitoring system of a liquid nitrogen filling device 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 sequentially connected, and the alarm device is connected with the central processing unit;
the ultrasonic liquid level meter is used for measuring the liquid level of the liquid nitrogen filling device,
the device comprises a microprocessor, a first pulse signal processing module, a second pulse signal processing module, a first pulse echo signal processing module, a second pulse echo signal processing module and a second pulse echo signal processing module, wherein the microprocessor is used for sending the first pulse signal and the second pulse signal, receiving the first pulse echo signal and the second pulse echo signal, determining the actual sound wave transmission speed in the liquid nitrogen filling device according to the first time difference between the received first pulse echo signal and the sent first pulse signal, and determining the liquid level value of the liquid nitrogen filling device according to the second time difference between the received second pulse echo signal and the sent second pulse signal and the actual sound wave transmission speed;
the first ultrasonic measuring device is used for sending a first ultrasonic signal after receiving a first pulse signal sent by the microprocessor, correspondingly generating a first pulse echo signal after receiving a first ultrasonic echo signal corresponding to the first ultrasonic signal, and sending the first pulse echo signal to the microprocessor; the first time difference is the transmission time of the first ultrasonic signal and the first ultrasonic echo signal in the liquid nitrogen filling device;
the second ultrasonic measuring device is used for sending a second ultrasonic signal after receiving a second pulse signal sent by the microprocessor, correspondingly generating a second pulse echo signal after receiving a second ultrasonic echo signal corresponding to the second ultrasonic signal, and sending the second pulse echo signal to the microprocessor; and the second time difference is the transmission time of the second ultrasonic wave signal and the second ultrasonic echo signal in the liquid nitrogen filling device.
As a preferred technical scheme of the invention: the first ultrasonic measuring device comprises a first ultrasonic transmitting circuit and a first ultrasonic receiving circuit, wherein the microprocessor, the first ultrasonic transmitting circuit and the first ultrasonic receiving circuit are sequentially connected, and the first ultrasonic receiving circuit is connected with the microprocessor.
As a preferred technical scheme of the invention: the first ultrasonic transmitting circuit consists of a TTL non-gate circuit; the first ultrasonic receiving circuit takes a monostable trigger circuit composed of NE555 as a core.
As a preferred technical scheme of the invention: the liquid level display adopts an LED display.
As a preferred technical scheme of the invention: the alarm device is an audible and visual alarm.
Compared with the prior art, the liquid level monitoring system of the liquid nitrogen filling device has the following technical effects:
(1) the invention adopts the ultrasonic detection technology to detect the level of liquid nitrogen in the liquid nitrogen filling device, and has the advantages of high precision, no pollution and no contact.
(2) The liquid level reading device provided by the invention is very intuitive in reading the liquid level of liquid nitrogen in the liquid nitrogen filling device, and provides convenience for clinical staff to quickly and safely obtain liquid level data of the liquid nitrogen.
(3) The liquid nitrogen filling device is provided with the alarm device, and once the volume of liquid nitrogen in the liquid nitrogen filling device is lower than a preset value, alarm information is sent out to remind medical staff to replenish the liquid nitrogen in time.
Detailed Description
The invention will be described in further detail below with reference to the accompanying drawings.
A liquid level monitoring system of a liquid nitrogen filling device 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 sequentially connected, and the alarm device is connected with the central processing unit;
the ultrasonic liquid level meter is used for measuring the liquid level of the liquid nitrogen filling device,
the device comprises a microprocessor, a first pulse signal processing module, a second pulse signal processing module, a first pulse echo signal processing module, a second pulse echo signal processing module and a second pulse echo signal processing module, wherein the microprocessor is used for sending the first pulse signal and the second pulse signal, receiving the first pulse echo signal and the second pulse echo signal, determining the actual sound wave transmission speed in the liquid nitrogen filling device according to the first time difference between the received first pulse echo signal and the sent first pulse signal, and determining the liquid level value of the liquid nitrogen filling device according to the second time difference between the received second pulse echo signal and the sent second pulse signal and the actual sound wave transmission speed;
the first ultrasonic measuring device is used for sending a first ultrasonic signal after receiving a first pulse signal sent by the microprocessor, correspondingly generating a first pulse echo signal after receiving a first ultrasonic echo signal corresponding to the first ultrasonic signal, and sending the first pulse echo signal to the microprocessor; the first time difference is the transmission time of the first ultrasonic signal and the first ultrasonic echo signal in the liquid nitrogen filling device;
the second ultrasonic measuring device is used for sending a second ultrasonic signal after receiving a second pulse signal sent by the microprocessor, correspondingly generating a second pulse echo signal after receiving a second ultrasonic echo signal corresponding to the second ultrasonic signal, and sending the second pulse echo signal to the microprocessor; and the second time difference is the transmission time of the second ultrasonic wave signal and the second ultrasonic echo signal in the liquid nitrogen filling device.
As a preferred technical scheme of the invention: the first ultrasonic measuring device comprises a first ultrasonic transmitting circuit and a first ultrasonic receiving circuit, wherein the microprocessor, the first ultrasonic transmitting circuit and the first ultrasonic receiving circuit are sequentially connected, and the first ultrasonic receiving circuit is connected with the microprocessor.
As a preferred technical scheme of the invention: the first ultrasonic transmitting circuit consists of a TTL non-gate circuit; the first ultrasonic receiving circuit takes a monostable trigger circuit composed of NE555 as a core.
As a preferred technical scheme of the invention: the liquid level display adopts an LED display.
As a preferred technical scheme of the invention: the alarm device is an audible and visual alarm.
The invention adopts the ultrasonic detection technology to detect the liquid level of the liquid nitrogen in the liquid nitrogen filling device, and has the advantages of high precision, no pollution and no contact.
The ultrasonic detection technology is a very important means and method in the technical field of the present social nondestructive detection, and is widely applied to quality monitoring and safety guarantee of various industries. The frequency range of sound waves that can be heard by the human ear is usually between 20-20000Hz, and sound waves with a frequency exceeding 20KHz are conventionally called ultrasonic waves.
The speed at which an acoustic wave propagates forward in a medium is called the speed of sound. The propagation velocity differs for different types of ultrasound. The propagation velocity of ultrasonic waves in a medium is related to the elastic modulus of the medium and the density of the medium, and for a certain medium, the elastic modulus and the density are constant, so the sound velocity is also constant. Different media, having different speeds of sound. When the ultrasonic wave forms are different, the elastic deformation modes of the medium are different, and the speed is different. Therefore, the speed of propagation of ultrasonic waves in a medium is an important parameter characterizing the acoustic properties of the medium. The relationship between the frequency, wavelength and speed of sound of ultrasound is as follows:
wherein,the wavelength of the ultrasonic wave,The wave velocity of the ultrasonic wave in the medium,Is the frequency of the ultrasonic wave. It can be seen that the wavelength of ultrasonic waves in the same medium is inversely proportional to the frequency of the ultrasonic waves.
The principle of the invention is as follows: flow is measured by detecting the effect of fluid flow on an ultrasonic beam (or pulse). Namely, adopting a time difference type measurement principle: a signal transmitted by one probe penetrates through the pipe wall, the medium and the pipe wall on the other side and is received by the other probe, meanwhile, a signal transmitted by the second probe is also received by the first probe, and due to the influence of the medium flow velocity, a time difference delta t exists between the two probes, and a conversion relation V = (C2/2L). times.delta t between the flow velocity V and the time difference delta t can be obtained according to calculation, so that a flow value Q can be obtained.
The principle of the invention is a non-contact measuring method which can be used for measuring the medium flow of a large pipe diameter and measuring a medium which is not easy to contact and observe. The device has high measurement accuracy, is hardly interfered by various parameters of the measured medium, and particularly can solve the problem of flow measurement of strong corrosive, non-conductive, radioactive and flammable and explosive media which cannot be measured by other instruments.
The liquid nitrogen filling device is provided with the alarm device, and once the volume of liquid nitrogen in the liquid nitrogen filling device is lower than a preset value, alarm information is sent out to remind medical staff to replenish the liquid nitrogen in time. The liquid level reading device provided by the invention is very intuitive in reading the liquid level of liquid nitrogen in the liquid nitrogen filling device, and provides convenience for clinical staff to quickly and safely obtain liquid level data of the liquid nitrogen.
The first embodiment is as follows:
because the liquid nitrogen filling device can inject air into the liquid nitrogen filling device to pressurize the liquid nitrogen tank in the using process and the temperature of the device per se changes, the actual sound wave transmission speed in the liquid nitrogen filling device needs to be determined again for the measuring accuracy, so that the liquid level measuring accuracy is ensured. Measuring the liquid level of a liquid nitrogen filling device by using an ultrasonic liquid level meter, firstly, sending a first pulse signal by a microprocessor, and recording the time for sending the first pulse signal; the first ultrasonic measuring device sends a first ultrasonic signal after receiving a first pulse signal sent by the microprocessor, correspondingly generates a first pulse echo signal after receiving a first ultrasonic echo signal corresponding to the first ultrasonic signal, and sends the first pulse echo signal to the microprocessor; the microprocessor determines the actual sound wave transmission speed in the liquid nitrogen filling device according to the first time difference between the receiving of the first pulse echo signal and the sending of the first pulse signal; the first time difference is the transmission time of the first ultrasonic signal and the first ultrasonic echo signal in the liquid nitrogen filling device; the microprocessor sends a second pulse signal and records the time for sending the second pulse signal; the second ultrasonic measuring device is arranged on the outer surface of the bottom wall of the liquid nitrogen filling device and sends out a second ultrasonic signal after receiving the second pulse signal sent by the microprocessor, correspondingly generates a second pulse echo signal after receiving a second ultrasonic echo signal corresponding to the second ultrasonic signal, and sends the second pulse echo signal to the microprocessor; the second time difference is the transmission time of the second ultrasonic wave signal and the second ultrasonic echo signal in the liquid nitrogen filling device; and the microprocessor determines the liquid level value in the liquid nitrogen filling device according to a second time difference between the reception of the second pulse echo signal and the transmission of the second pulse signal and the actual sound wave transmission speed.
While the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (5)
1. A liquid level monitoring system of a liquid nitrogen filling device 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 sequentially connected, and the alarm device is connected with the central processing unit;
it is characterized in that the ultrasonic liquid level meter is used for measuring the liquid level of a liquid nitrogen filling device and comprises
The microprocessor is used for sending a first pulse signal and a second pulse signal, receiving the first pulse echo signal and the second pulse echo signal, determining the actual sound wave transmission speed in the liquid nitrogen filling device according to a first time difference between the received first pulse echo signal and the sent first pulse signal, and determining the liquid level value of the liquid nitrogen filling device according to a second time difference between the received second pulse echo signal and the sent second pulse signal and the actual sound wave transmission speed;
the first ultrasonic measuring device is used for sending a first ultrasonic signal after receiving a first pulse signal sent by the microprocessor, correspondingly generating a first pulse echo signal after receiving a first ultrasonic echo signal corresponding to the first ultrasonic signal, and sending the first pulse echo signal to the microprocessor; the first time difference is the transmission time of the first ultrasonic signal and the first ultrasonic echo signal in the liquid nitrogen filling device;
the second ultrasonic measuring device is used for sending a second ultrasonic signal after receiving a second pulse signal sent by the microprocessor, correspondingly generating a second pulse echo signal after receiving a second ultrasonic echo signal corresponding to the second ultrasonic signal, and sending the second pulse echo signal to the microprocessor; and the second time difference is the transmission time of the second ultrasonic wave signal and the second ultrasonic echo signal in the liquid nitrogen filling device.
2. The liquid level monitoring system of a liquid nitrogen filling device according to claim 1, wherein the first ultrasonic measuring device comprises a first ultrasonic transmitting circuit and a first ultrasonic receiving circuit, wherein the microprocessor, the first ultrasonic transmitting circuit and the first ultrasonic receiving circuit are connected in sequence, and the first ultrasonic receiving circuit is connected with the microprocessor.
3. The liquid level monitoring system of a liquid nitrogen filling device according to claim 2, wherein said first ultrasonic transmission circuit is composed of a TTL not-gate circuit; the first ultrasonic receiving circuit takes a monostable trigger circuit composed of NE555 as a core.
4. The liquid level monitoring system of a liquid nitrogen filling device according to claim 1, wherein the liquid level display is an LED display.
5. The liquid level monitoring system of a liquid nitrogen filling device according to claim 1, wherein the alarm device is an audible and visual alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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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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| Application Number | Priority Date | Filing Date | Title |
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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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| CN105181083A true CN105181083A (en) | 2015-12-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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2015
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| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20151223 |