CN204612780U - A kind of low-temperature liquid level measuring system - Google Patents
A kind of low-temperature liquid level measuring system Download PDFInfo
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- CN204612780U CN204612780U CN201520282520.6U CN201520282520U CN204612780U CN 204612780 U CN204612780 U CN 204612780U CN 201520282520 U CN201520282520 U CN 201520282520U CN 204612780 U CN204612780 U CN 204612780U
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Abstract
The utility model discloses a kind of low-temperature liquid level measuring system, measure while realizing two kinds of low-temperature liquid levels, and by vacuum insulation between the first container of splendid attire two kinds of liquid and second container, the capacitance probe that this measuring system comprises the resistance-type probe in insertion first container and inserts in second container; Capacitance probe is provided with low-temperature liquid level measuring instrument, it is connected with cable between popping one's head in resistance-type, and low-temperature liquid level measuring instrument comprises communication module, for terminal equipment in communication.According to the low-temperature liquid level measuring system that the utility model realizes, system architecture is compact, volume is little, carry with, and the current value of detection can be adopted to carry out the calculating of resistance, adopt the frequency values detected to carry out the calculating of electric capacity, adopt the value after terminal device calibration to carry out the calculating of liquid level, the accurate in real time of low-temperature liquid level can be realized and measure.
Description
Technical field
The utility model belongs to low-temperature liquid level fields of measurement, more specifically, relates to a kind of low-temperature liquid level measuring system.
Background technology
Cryogenic liquid has very large danger due to its too low temperature, often be closed in sealable tank packaging container, liquid level in monitor container has very important effect to its danger of management and control, other equipment keeps its superconducting characteristic as superconducting magnet need rely on certain liquid level, therefore needs to judge accurately the liquid level of cryogenic liquid.But cryogenic liquid is sealed in container, is difficult to be undertaken by the method for naked eyes or manual measurement, and the liquid level gauging mode of current popular can not be used, as some contactless range findings such as laser ranging, ultrasonic ranging and traditional contact liquid level gauging method.
The ILM of Oxford Instruments company
200, AMI company low-temperature liquid level measuring instrument and adopt measurement by capacitance and resistance-type measuring method to measure liquid nitrogen and liquid helium level respectively, the cryogenic liquid measuring instrument used is desk-top instrument, instrument itself has complete measurement, calibration function, user is operated by panel knob, this low-temperature liquid level measuring instrument must coordinate cryogenic liquid probe to use simultaneously, probe is installed in cryogenic liquid vessel, and cryogenic liquid measuring instrument is placed on desktop, floor equivalent-load thing, be connected by cable with between probe.
And above-mentioned level instrument exists following problem: 1) in order to avoid the impact of the stray capacitance of cable itself, probe upper end needs mounting converter, to realize the conversion between probe measurement signal to the stable signal surveyed; 2) cryogenic liquid measuring instrument takes up room larger; 3) use cable connect mode easily bring new problem in some specific occasion, such as tested low liquid container be high-intensity magnetic field or container volume very large time, the length of connection cable will reach tens of rice, easily bring potential safety hazard; 4) existing cryogenic liquid measuring instrument uses RS232 to communicate with computing machine, can only obtain the liquid level gauging result data with reference significance, cannot accurately obtain liquid level legitimate reading in the unregulated situation of measurement result; 5) existing cryogenic liquid measuring instrument does not possess the function such as early warning, remote monitoring, and obtaining measurement data can only manual operation at the scene, cannot Real-time Obtaining liquid level state.
Utility model content
For above defect or the Improvement requirement of prior art, the utility model provides a kind of low-temperature liquid level measuring system, its object is to provide compact structure, without the need to erecting bed, and can realize the real-time monitoring of low-temperature liquid level and accurately measure.
For achieving the above object, according to an aspect of the present utility model, provide a kind of low-temperature liquid level measuring system, measure while realizing two kinds of low-temperature liquid levels, and by vacuum insulation between the first container of splendid attire two kinds of liquid and second container, it is characterized in that, this measuring system comprises the resistance-type probe inserted in described first container and the capacitance probe inserted in second container; Described capacitance probe is provided with low-temperature liquid level measuring instrument, its pop one's head in described resistance-type between cable be connected, described low-temperature liquid level measuring instrument comprises communication module, for terminal equipment in communication.
In general, the above technical scheme conceived by the utility model compared with prior art, can obtain following beneficial effect:
(1) according to the low temperature level gauging system that the utility model realizes, compact structure is simple, can use lithium battery power supply or externally fed, and can be directly installed on level sensor, without the need to erecting bed, low-temperature liquid level measuring instrument and the level sensor such as liquid helium, liquid nitrogen are separated from each other, can carry with, there is portable nature;
(2) two coaxial stainless webmaster composition liquid nitrogen sensors are used, use superconduction resistance wire and heating resistor composition liquid helium sensor, use single-chip microcomputer directly to measure the frequency measurement liquid nitrogen liquid level of liquid nitrogen sensor conversion output, use the method controlling size of current and current time to export pulse current and drive liquid helium sensor;
(3) liquid helium sensor drives that constant current source output terminal serial connection can control, low resistance switches, and leakage current when low-temperature liquid level measuring instrument is not worked is less than 1uA, makes the use of level instrument reduce to minimum degree to increase liquid helium volatile quantity;
(4) low-temperature liquid level measuring instrument uses man-machine interaction mode, terminal control device is connected by CAN or Ethernet (hold line meet standard IEEE 802.3 meet standard IEEE 802.b/n/g with wireless WIFI), by its operation low-temperature liquid level measuring instrument, and remote monitoring can be carried out to the real-time status of liquid level, such that Low Temperature Liquid planar survey system architecture is compact, volume is little, can carry with.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the low-temperature liquid level measuring system realized according to the utility model is installed on liquid container to be tested;
Fig. 2 is the hardware module schematic diagram of the low-temperature liquid level measuring system according to the utility model realization.
In all of the figs, identical Reference numeral is used for representing identical element or structure, wherein:
1-first cryogenic liquid 2-first cryogenic liquid vessel 3-capacitance probe 4-second cryogenic liquid 5-second cryogenic liquid vessel 6-resistance-type probe 7-connection cable 8-screw thread coupling 9-low-temperature liquid level measuring instrument 10-voltage conversion circuit 11-current monitoring circuit 12-low-ohmic switches 13-controllable constant-current source 14-capacitance-frequency conversion circuit 15-MCU processor 16-OLED shields 17-warning acousto-optic instruction 18-ethernet transceiver 19-CAN bus transceiver 20-computer terminal 21-mobile platform terminal device 22-cable connector
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.In addition, if below in described each embodiment of the utility model involved technical characteristic do not form conflict each other and just can mutually combine.
Low-temperature liquid level measuring system of the present utility model is installed on schematic diagram in liquid levels container as shown in Figure 1, be less than in the equipment of first cryogenic liquid 4 of 10K (as superconducting magnet) at use liquid helium equitemperature, in order to reduce the rate of volatilization of the first expensive cryogenic liquid 4, the first cryogenic liquid vessel 5 of this cryogenic liquid of splendid attire of being everlasting is outer places one second cryogenic liquid vessel 2, for splendid attire second cryogenic liquid 1, between cryogenic liquid vessel 5 and cryogenic liquid vessel 2, use vacuum insulation.
In order to measure the liquid level of the second cryogenic liquid 1 and the first cryogenic liquid 4 simultaneously, low-temperature liquid level measuring instrument resistance-type probe 6 inserts the first cryogenic liquid 4 by the first cryogenic liquid vessel 5, and low-temperature liquid level measuring instrument capacitance probe 3 inserts the second cryogenic liquid 1 by the second cryogenic liquid vessel 2.
Low-temperature liquid level measuring instrument 9 is threaded connection device 8 and is connected with low-temperature liquid level measuring instrument capacitance probe 3, low-temperature liquid level measuring instrument 9 is directly installed on above low-temperature liquid level measuring instrument capacitance probe 3, and can carries out dismounting easily.Low-temperature liquid level measuring instrument resistance-type probe 6 and low-temperature liquid level measuring instrument 9 close proximity, and be directly connected with low-temperature liquid level measuring instrument 9 by short connection cable 7.
As shown in Figure 2, the hardware schematic diagram of the low-temperature liquid level measuring system realized according to the utility model, wherein, MCU processor 15 is central processing units of low-temperature liquid level measuring instrument, complete the control of peripheral equipment, data processing, and communicate with terminal 25 or mobile platform terminal 26.
Controllable constant-current source 13 is under the driving of the inner DAC of MCU processor 15, export and specify the electric current of size to carry out the working current of sensing as resistance-type probe, electric current flows through low-ohmic switches 12, when MCU processor 15 external command received from computer terminal 20 or mobile platform terminal device 21 carries out the level gauging of the first cryogenic liquid 4, MCU processor 15 controls low-ohmic switches 12 and opens, electric current can be flow through smoothly, otherwise close low-ohmic switches 12, the quiescent current that low-temperature liquid level measuring instrument is exported when off position is almost 0, reduce the consumption of the first cryogenic liquid 4 to greatest extent, because low-temperature liquid level measuring instrument is in non-duty, low-ohmic switches is in buttoned-up status, the electric current of measuring circuit should be close to 0 in theory, if abnormal output current still detected during the period at MCU processor, then this low-temperature liquid level measuring instrument can make corresponding actuation of an alarm timely.
Output current enters low-temperature liquid level measuring instrument resistance-type probe 6 through cable connector 7, and to pop one's head in 6 two ends coating-forming voltage in low-temperature liquid level measuring instrument resistance-type, and return through cable connector 7 and enter voltage conversion circuit 10 and current monitoring circuit 11 two branch roads respectively.The output of voltage conversion circuit 10 is sampled by the inner ADC of MCU processor 15, and MCU processor 15 can obtain low-temperature liquid level measuring instrument resistance-type and to pop one's head in 6 two ends magnitude of voltage accurately.The output of current monitoring circuit 11 is sampled by the inner ADC of MCU processor 15, MCU processor 15 can obtain output current accurately, thus accurately calculate the resistance value of low-temperature liquid level measuring instrument resistance-type probe 9, in such cases, the measurement of resistance carries out calculating instead of theoretical output valve according to accurate measured value, can put forward high-resistance measuring accuracy better.
In the standby state, MCU processor 15 still constantly measures by current monitoring circuit 11 electric current flowing through low-temperature liquid level measuring instrument resistance-type probe 6, when there are abnormal conditions in electric current, MCU processor 15 will send warning message by ethernet transceiver 18, CAN transceiver 19 to computer terminal 20, mobile platform terminal device 21, indicate on 17 and will carry out alarm indication simultaneously at the OLED screen 16 be connected with MCU processor 15, warning acousto-optic.
Low-temperature liquid level measuring instrument capacitance probe 3 is connected through the capacitance-frequency conversion circuit 14 of screw thread coupling 8 with low-temperature liquid level measuring instrument 9 inside, capacitance measured by low-temperature liquid level measuring instrument capacitance probe 3 is converted to frequency values, frequency values is calculated by the collection of MCU processor 15 timer internal, and calculates low-temperature liquid level measuring instrument capacitance probe 3 capacitance accurately.
MCU processor 15 is communicated with mobile platform terminal device 21 with computer utility terminal device 20 with CAN transceiver 19 by ethernet transceiver 18, low-temperature liquid level measuring instrument capacitance probe 3 capacitance that MCU processor 15 is gathered and low-temperature liquid level measuring instrument resistance-type 6 resistance values of popping one's head in are uploaded to computer terminal 20 and mobile platform terminal device 21, and calibrated by computer terminal 20 and mobile platform terminal device 21 pairs of capacitances and resistance value, calibration value sends to MCU processor 15 by ethernet transceiver 18 and CAN transceiver 19, MCU processor 15 accurately calculates the liquid level percentage height of the first cryogenic liquid 4 and the second cryogenic liquid 1 further, this percent value is together with resistance value, capacitance is uploaded to computer terminal 20 and mobile platform terminal device 21 in the lump, show in OLED screen 16 simultaneously, the use of computer terminal etc., the height of low-temperature liquid level can be grasped in real time, and obtain warning message in the very first time, gain time for processing dangerous situation in time.
In a word, according to low-temperature liquid level measuring system of the present utility model, there is following outstanding feature:
1) low-temperature liquid level measuring instrument 9 uses the circuit structure of multi-functional MCU processor 15 and current source 13, capacitance-frequency conversion method, pops one's head in 6, capacitance-frequency conversion circuit 14, low-temperature liquid level measuring instrument capacitance probe 3 form by MCU processor 15, voltage conversion circuit 10, current monitoring circuit 11, low-ohmic switches 12, controllable constant-current source 13, low-temperature liquid level measuring instrument resistance-type;
2) low-temperature liquid level measuring instrument 9 is directly connected with capacitance probe 3, low-temperature liquid level measuring instrument 9 and resistance-type are popped one's head in and 6 are used very short connection cable 7 to be connected, low-temperature liquid level measuring instrument 9 can measure two kinds of low-temperature liquid levels simultaneously, compact conformation, volume is little, can be directly installed on cryogenic liquid vessel, there is portable feature;
3) use current monitoring circuit 11 to realize the accurate measurement of output current, and not with theoretical output current for basis, achieve higher liquid level gauging accuracy;
4) use of low-ohmic switches 12 reduces the leakage current output of low-temperature liquid level measuring instrument 9, and current monitoring circuit 11 achieves the real-time monitoring to leakage current simultaneously, ensure that the security of low-temperature liquid level measuring instrument 9;
6) low-temperature liquid level measuring instrument 9 can with use CAN between computer terminal 20, mobile platform terminal device 21, Ethernet communicates, the data transmitted comprise low-temperature liquid level measuring instrument resistance-type probe 6, the actual measured value of low-temperature liquid level measuring instrument capacitance probe 3 and the liquid level percent value after changing, and make measurement result can meet the user demand of various application scenario.
7) application of computer terminal 20, mobile platform terminal device 21, makes low-temperature liquid level measuring instrument 9 possess the ability can monitoring tested low-temperature liquid level height in real time, reports to the police and has visualization feature.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (1)
1. a low-temperature liquid level measuring system, measure while realizing two kinds of low-temperature liquid levels, and by vacuum insulation between first container (5) of splendid attire two kinds of liquid and second container (2), it is characterized in that, this measuring system comprises resistance-type probe (6) inserted in described first container (5) and the capacitance probe (3) inserted in second container (2); Described capacitance probe (3) is provided with low-temperature liquid level measuring instrument (9), its cable between (6) of popping one's head in described resistance-type is connected, described low-temperature liquid level measuring instrument (9) comprises communication module, for terminal equipment in communication.
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| CN201520282520.6U CN204612780U (en) | 2015-05-04 | 2015-05-04 | A kind of low-temperature liquid level measuring system |
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| CN201520282520.6U CN204612780U (en) | 2015-05-04 | 2015-05-04 | A kind of low-temperature liquid level measuring system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289457A (en) * | 2016-07-14 | 2017-01-04 | 天津市鑫成仪表有限公司 | A kind of magnetic induction level monitoring device based on CAN |
| TWI657232B (en) * | 2016-12-27 | 2019-04-21 | 日商富士金股份有限公司 | Liquid level meter, gasifier with the same and liquid level detection method |
| CN110132371A (en) * | 2019-04-23 | 2019-08-16 | 天津大学 | A kind of superconduction liquidometer for cryogenic cooling liquid liquid level monitoring |
| CN111727344A (en) * | 2018-01-19 | 2020-09-29 | 低温科技有限责任公司 | Head for a storage container for liquids |
-
2015
- 2015-05-04 CN CN201520282520.6U patent/CN204612780U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289457A (en) * | 2016-07-14 | 2017-01-04 | 天津市鑫成仪表有限公司 | A kind of magnetic induction level monitoring device based on CAN |
| TWI657232B (en) * | 2016-12-27 | 2019-04-21 | 日商富士金股份有限公司 | Liquid level meter, gasifier with the same and liquid level detection method |
| CN111727344A (en) * | 2018-01-19 | 2020-09-29 | 低温科技有限责任公司 | Head for a storage container for liquids |
| CN110132371A (en) * | 2019-04-23 | 2019-08-16 | 天津大学 | A kind of superconduction liquidometer for cryogenic cooling liquid liquid level monitoring |
| CN110132371B (en) * | 2019-04-23 | 2020-10-30 | 天津大学 | Superconducting liquid level meter for monitoring liquid level of cryogenic liquid |
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Address after: 430075, No. seven, No. 128, East Lake hi tech Development Zone, Wuhan, Hubei, Optics Valley Patentee after: WUHAN ZHONGKE NIUJIN WAVE SPECTRUM TECHNOLOGY Co.,Ltd. Address before: 430075 No.128, Guanggu 7th Road, Donghu hi tech Development Zone, Wuhan City, Hubei Province Patentee before: WUHAN ZHONGKE MR TECHNOLOGY Co.,Ltd. |
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