CN102410969A - Device for measuring volatile ratio of superconducting magnet liquid helium - Google Patents
Device for measuring volatile ratio of superconducting magnet liquid helium Download PDFInfo
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- CN102410969A CN102410969A CN2011102273955A CN201110227395A CN102410969A CN 102410969 A CN102410969 A CN 102410969A CN 2011102273955 A CN2011102273955 A CN 2011102273955A CN 201110227395 A CN201110227395 A CN 201110227395A CN 102410969 A CN102410969 A CN 102410969A
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- superconducting magnet
- liquid helium
- absolute pressure
- pressure controller
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Abstract
The invention relates to a device for measuring volatile ratio of superconducting magnet liquid helium, which is characterized in that the device comprises an absolute pressure controller, a mass flow meter and a corrugated pipe; one end of the corrugated pipe is connected with a helium outlet of a superconducting magnet while the other end of the corrugated pipe is connected with an upstream port of the absolute pressure controller; and the downstream port of the absolute pressure controller is connected with the mass flow meter. The device for measuring volatile ratio of superconducting magnet liquid helium provided by the invention can be added with a one-way valve that is connected with an exhaust port of the superconducting magnet by a tee joint. The measuring device provided by the invention can be further added with a computer that is connected with the serial control ports of the absolute pressure controller and the mass flow meter by a serial port data wire for collecting and recording the absolute pressure value and liquid helium volatile ratio data in a superconducting magnet liquid helium cavity in real time. The device for measuring volatile ratio of superconducting magnet liquid helium is featured with simple structure, high safety, high control accuracy and stability, and capability of accurately acquiring the volatile ratio data of the superconducting magnet liquid helium in real time without increasing the thermal load of the superconducting magnet.
Description
Technical field
The invention belongs to the cryogenic magnet technical field, particularly a kind of measurement mechanism of superconducting magnet liquid helium volatility.
Background technology
Liquid helium volatility measurement mechanism is in order to obtain the liquid helium day volatile quantity of low-temperature liquid helium container; And then the thermal load of knowing the low-temperature liquid helium container is big or small; Can reduce the loss of its liquid helium through the thermal load that reduces liquid helium vessel, thus the better cost of energy savings and test.
The device of existing measurement liquid helium volatility mainly contains following several kinds: the initial weight of (1) weighing superconducting magnet; Leave standstill after several days its weight of weighing once more; The weight difference of twice weighing can obtain the liquid helium volatility of superconducting magnet divided by the time; Shortcoming is must measurement must be under magnet is in the state of null field, to carry out, and since under Various Seasonal and the varying environment variation of atmospheric pressure cause measuring accuracy very poor; (2) connect a flowmeter measuring device at the superconducting magnet exhausr port; The total gas flow rate of flowing through in the acquisition certain hour; Thereby obtain the liquid helium volatility of superconducting magnet, shortcoming is that same variation owing to atmospheric pressure under Various Seasonal and the varying environment causes its measuring accuracy very poor; (3) utilize the inner helium pressure of relative pressure controller control superconducting magnet; Utilize mass flowmeter to measure then; Shortcoming is the variation along with superconducting magnet external environment condition pressure; The superconducting magnet pressure inside has than great fluctuation process, and under the different pressures condition, same thermal losses will produce different liquid helium losses.
Summary of the invention
In order to solve the existing significant deficiency of existing superconducting magnet liquid helium volatility measurement mechanism, the technical matters that the present invention will solve provides a kind of high precision superconducting magnet liquid helium volatility measurement mechanism that not influenced by ambient pressure environment.
The present invention realizes that the technical scheme of superconducting magnet liquid helium volatility measurement mechanism is:
A kind of superconducting magnet liquid helium volatility measurement mechanism; Comprise absolute pressure controller, mass flowmeter and corrugated tube; One end of said corrugated tube connects the helium exhausr port of superconducting magnet; The other end of corrugated tube connects the upstream port of said absolute pressure controller, and the downstream port of said absolute pressure controller connects said mass flowmeter.
Said absolute pressure controller is made up of absolute pressure transducer, ratio adjusting valve and closed control circuit; Said absolute pressure transducer is communicated with upstream port; Ratio adjusting valve is communicated with downstream port, and closed control circuit is connected with ratio adjusting valve with absolute pressure transducer respectively.
Said superconducting magnet liquid helium volatility measurement mechanism also comprises retaining valve and threeway, and two connectors of threeway are connected between the helium exhausr port and corrugated tube of superconducting magnet, and another connector of threeway is connected with retaining valve.
Said superconducting magnet liquid helium volatility measurement mechanism also comprises computing machine, and computing machine is connected with the Serial Control mouth of absolute pressure controller and the Serial Control mouth of mass flowmeter respectively through serial port data line.
The absolute pressure setting value of said absolute pressure controller is greater than the atmospheric pressure value of superconducting magnet environment of living in.
Said corrugated tube is a length greater than 3 meters corrugated tube.
Said corrugated tube is the low temperature resistant tubing with sealing.。
The principle of work of superconducting magnet liquid helium volatility measurement mechanism of the present invention is:
Set the atmospheric pressure value big 0.5psi of the controlled pressure of absolute pressure controller than superconducting magnet environment of living in; When if the pressure transducer of absolute pressure controller detects the inner helium pressure value of superconducting magnet less than the absolute pressure setting value; The absolute pressure controller ratio adjusting valve close, superconducting magnet liquid helium chamber gets into slow boost phase; Otherwise when the force value that detects during greater than the absolute pressure setting value, ratio adjusting valve will be opened exhaust reducing the pressure in the superconducting magnet liquid helium chamber, the size of valve switch according to actual detection to superconducting magnet internal pressure value size automatically adjust.The helium that said absolute pressure controller is discharged gets into the mass flowmeter of next stage subsequently, thereby obtains the liquid helium volatility of superconducting magnet under the constant pressure.Utilization is connected absolute pressure and the liquid helium volatility data in the computer real-time record superconducting magnet liquid helium chamber on said absolute pressure controller and the mass flowmeter, and continuous coverage can obtain the accurate superconducting magnet liquid helium volatility data that not influenced by ambient pressure environment in several days.
Can find out that according to above-mentioned principle compared with prior art, beneficial effect of the present invention is embodied in:
(1) uses the absolute pressure controller, avoided ambient pressure environment to change the influence that superconducting magnet liquid helium volatility is measured.
(2) be connected the retaining valve of superconducting magnet exhaust ports, can prevent that the liquid helium volatilization from leaking to be obstructed, thereby avoid entire measuring device when unattended, to be damaged because of unexpected situations such as burst power failures.
(3) utilize the inner absolute pressure of computer real-time observation and record superconducting magnet and the situation of change of liquid helium volatility, thereby be informed in the influence that all accidentalia of occurring in the whole measuring process are brought.
Description of drawings
Fig. 1 measures the liquid helium volatility raw-data map that obtains with the superconducting magnet liquid helium volatility measurement mechanism that the present invention processes to the 1.5T magnetic resonance image-forming superconducting magnet.
Fig. 2 measures to the 1.5T magnetic resonance image-forming superconducting magnet with the superconducting magnet liquid helium volatility measurement mechanism that the present invention processes that absolute pressure changes raw-data map in the superconducting magnet liquid helium chamber of time record.
Fig. 3 is the structural representation of the basic model superconducting magnet liquid helium volatility measurement mechanism of the embodiment of the invention one.
Fig. 4 is the structural representation of the embodiment of the invention two superconducting magnet liquid helium volatility measurement mechanisms.
Fig. 5 is the principle of work block diagram of the absolute pressure controller described in the superconducting magnet liquid helium volatility measurement mechanism of the present invention.
Label among the figure: 1 is that absolute pressure controller, 2 is that mass flowmeter, 3 is that retaining valve, 4 is that threeway, 5 is that computing machine, 6 is that serial port data line, 7 is that corrugated tube, 8 is that superconducting magnet, 9 is that upstream port, 10 is that downstream port, 11 is that absolute pressure transducer, 12 is that closed control circuit, 13 is a ratio adjusting valve.
Below through embodiment and structure accompanying drawing the present invention is done further description.
Embodiment
Embodiment one: basic model superconducting magnet liquid helium volatility measurement mechanism.
Referring to Fig. 3, basic model superconducting magnet liquid helium volatility measurement mechanism of the present invention comprises absolute pressure controller 1, mass flowmeter 2 and corrugated tube 7.One end of said corrugated tube 7 connects the helium exhausr port of superconducting magnet 8, and the other end connects the upstream port 9 of said absolute pressure controller 1, and the downstream port 10 of said absolute pressure controller 1 connects said mass flowmeter 2.
The principle of work of present embodiment is following:
Superconducting magnet is got rid of via the helium exhausr port owing to the external heat load causes liquid helium absorption heat to become helium; The cold helium of discharging gets into absolute pressure controller 1 through corrugated tube 7; Helium pressure value in the absolute pressure transducer in the absolute pressure controller 1 11 detects superconducting magnet 8 liquid helium chambeies is during less than the absolute pressure setting value; Ratio adjusting valve 13 in the absolute pressure controller 1 will be closed, the slow boost phase of the inner entering in superconducting magnet 8 liquid helium chambeies; Otherwise; When the force value that detects during greater than the absolute pressure setting value; Ratio adjusting valve 13 will be opened exhaust reducing the pressure in the superconducting magnet 8 liquid helium chambeies, the size of ratio adjusting valve 13 switches according to actual detection to superconducting magnet 8 internal pressure value sizes automatically adjust through the closed control circuit in the absolute pressure controller 1 12.The helium of discharging via absolute pressure controller 1 gets in the mass flowmeter 2 of next stage subsequently, thereby obtains the liquid helium volatility of superconducting magnet under the constant pressure.
Embodiment two: standard form superconducting magnet liquid helium volatility measurement mechanism.
Referring to Fig. 4, standard form superconducting magnet liquid helium volatility measurement mechanism of the present invention comprises absolute pressure controller 1, mass flowmeter 2 and corrugated tube 7, also comprises retaining valve 3, threeway 4, computing machine 5 and serial port data line 6.A port of said threeway 4 is connected on the exhausr port of superconducting magnet 8; Second port that said retaining valve 3 is communicated with in threeway 4; The 3rd port that the upstream port 9 of said absolute pressure controller 1 is communicated with in threeway 4 through corrugated tube 7; The downstream port 10 that said mass flowmeter 2 is communicated with at absolute pressure controller 1, computing machine 5 connects the serial communication port of absolute pressure controller 1 and mass flowmeter 2 respectively through serial port data line 6.
The principle of work of present embodiment is following:
Superconducting magnet is got rid of via exhausr port owing to the external heat load causes liquid helium absorption heat to become helium; Cold helium at first gets into the threeway 4 of superconducting magnet exhaust ports; If be communicated with at the opening pressure of the retaining valve 3 of 4 second ports of threeway inside and outside differential pressure greater than superconducting magnet 8 liquid helium chambeies; The helium that then volatilizes will all be discharged through absolute pressure controller 1; When the pressure transducer in the absolute pressure controller 1 detects the inner helium pressure value in superconducting magnet 8 liquid helium chambeies less than the absolute pressure setting value, the ratio adjusting valve 13 in the absolute pressure controller 1 will be closed, the slow boost phase of the inner entering in superconducting magnet 8 liquid helium chambeies; Otherwise; When the force value that detects during greater than the absolute pressure setting value; Ratio adjusting valve 13 will be opened exhaust reducing the pressure in the superconducting magnet 8 liquid helium chambeies, the size of ratio adjusting valve 13 switches according to actual detection to superconducting magnet 8 liquid helium chamber pressure inside value sizes automatically adjust through the closed control circuit in the absolute pressure controller 1 12.The helium of discharging via absolute pressure controller 1 gets in the mass flowmeter 2 of next stage subsequently, thereby obtains the liquid helium volatility of superconducting magnet 8 under the constant pressure.Utilization is connected absolute pressure and the liquid helium volatility data in the computing machine 5 real-time acquisition and recording superconducting magnets 8 liquid helium chambeies on said absolute pressure controller 1 and the mass flowmeter 2, attaches Fig. 1 and 2 and be the raw-data map of absolute pressure variation and liquid helium volatility in the 1.5T magnetic resonance image-forming superconducting magnet liquid helium chamber that utilizes the standard form superconducting magnet 8 liquid helium volatility measurement mechanisms measurement acquisition that the present invention processes.
Claims (7)
1. superconducting magnet liquid helium volatility measurement mechanism; Comprise absolute pressure controller (1), mass flowmeter (2) and corrugated tube (7); It is characterized in that an end of said corrugated tube (7) connects the helium exhausr port of superconducting magnet (8); The other end of corrugated tube (7) connects the upstream port (9) of said absolute pressure controller (1), and the downstream port (10) of said absolute pressure controller (1) connects said mass flowmeter (2).
2. superconducting magnet liquid helium volatility measurement mechanism according to claim 1; It is characterized in that said absolute pressure controller (1) is made up of absolute pressure transducer (11), ratio adjusting valve (13) and closed control circuit (12); Said absolute pressure transducer (11) is communicated with upstream port (9); Ratio adjusting valve (13) is communicated with downstream port (10), and closed control circuit (12) is connected with ratio adjusting valve (13) with absolute pressure transducer (11) respectively.。
3. superconducting magnet liquid helium volatility measurement mechanism according to claim 1; It is characterized in that said superconducting magnet liquid helium volatility measurement mechanism also comprises retaining valve (3) and threeway (4); Two connectors of threeway (4) are connected between the helium exhausr port and corrugated tube (7) of superconducting magnet (8), and another connector of threeway (4) is connected with retaining valve (3).
4. superconducting magnet liquid helium volatility measurement mechanism according to claim 1; It is characterized in that said superconducting magnet liquid helium volatility measurement mechanism also comprises computing machine (5), computing machine (5) is connected with the Serial Control mouth of absolute pressure controller (1) and the Serial Control mouth of mass flowmeter (2) respectively through serial port data line (6).
5. superconducting magnet liquid helium volatility measurement mechanism according to claim 1 and 2 is characterized in that the atmospheric pressure value of the absolute pressure setting value of said absolute pressure controller (1) greater than superconducting magnet (8) environment of living in.
6. according to claim 1,2,3 or 4 described superconducting magnet liquid helium volatility measurement mechanisms, it is characterized in that said corrugated tube (7) is a length greater than 3 meters corrugated tube.
7. according to claim 1,2,3 or 4 described superconducting magnet liquid helium volatility measurement mechanisms, it is characterized in that the low temperature resistant tubing of said corrugated tube (7) for having sealing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102273955A CN102410969A (en) | 2011-08-09 | 2011-08-09 | Device for measuring volatile ratio of superconducting magnet liquid helium |
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| CN2011102273955A CN102410969A (en) | 2011-08-09 | 2011-08-09 | Device for measuring volatile ratio of superconducting magnet liquid helium |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103697956A (en) * | 2013-12-09 | 2014-04-02 | 上海齐耀动力技术有限公司 | System for measuring evaporation rate of cryogenic vessel with stable back pressure |
| CN104317336A (en) * | 2014-09-30 | 2015-01-28 | 西部超导材料科技股份有限公司 | Pressure control apparatus and control method of low-temperature working medium immersion type superconducting magnet |
| CN109307849A (en) * | 2018-12-04 | 2019-02-05 | 中国科学院上海微系统与信息技术研究所 | The method of SQUID measuring system and stable air pressure based on stable gas pressure |
| CN110109032A (en) * | 2019-05-06 | 2019-08-09 | 中国科学院上海微系统与信息技术研究所 | A kind of superconduction boat magnetism pressure stable-pressure device and air pressure method for stabilizing voltage |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103697956A (en) * | 2013-12-09 | 2014-04-02 | 上海齐耀动力技术有限公司 | System for measuring evaporation rate of cryogenic vessel with stable back pressure |
| CN104317336A (en) * | 2014-09-30 | 2015-01-28 | 西部超导材料科技股份有限公司 | Pressure control apparatus and control method of low-temperature working medium immersion type superconducting magnet |
| CN104317336B (en) * | 2014-09-30 | 2017-01-11 | 西部超导材料科技股份有限公司 | Control method of pressure control apparatus of low-temperature working medium immersion type superconducting magnet |
| CN109307849A (en) * | 2018-12-04 | 2019-02-05 | 中国科学院上海微系统与信息技术研究所 | The method of SQUID measuring system and stable air pressure based on stable gas pressure |
| CN109307849B (en) * | 2018-12-04 | 2022-05-17 | 中国科学院上海微系统与信息技术研究所 | SQUID measuring system based on air pressure stability and method for stabilizing air pressure |
| CN110109032A (en) * | 2019-05-06 | 2019-08-09 | 中国科学院上海微系统与信息技术研究所 | A kind of superconduction boat magnetism pressure stable-pressure device and air pressure method for stabilizing voltage |
| CN110109032B (en) * | 2019-05-06 | 2021-08-20 | 中国科学院上海微系统与信息技术研究所 | Superconducting aeromagnetic air pressure stabilizing device and air pressure stabilizing method |
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Application publication date: 20120411 |