CN217213104U - High-field superconducting magnet low-temperature vertical test system - Google Patents
High-field superconducting magnet low-temperature vertical test system Download PDFInfo
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- CN217213104U CN217213104U CN202220004954.XU CN202220004954U CN217213104U CN 217213104 U CN217213104 U CN 217213104U CN 202220004954 U CN202220004954 U CN 202220004954U CN 217213104 U CN217213104 U CN 217213104U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses a high-field superconducting magnet low-temperature vertical test system, which is characterized by comprising a vertical test Dewar, wherein the vertical test Dewar is provided with a pressure sensor, a liquid level meter, a safety valve for rapid pressure relief and a rupture disk for top blasting; one end of the return gas vaporizer is connected with the vertical test Dewar through a low-temperature pipeline, and the other end of the return gas vaporizer is connected with the helium recovery air bag through a first normal-temperature pipeline; a safety relief valve is arranged on the first normal temperature pipeline; the second normal temperature pipeline is a current lead wire gas return pipeline, one end of the second normal temperature pipeline is connected with a gas outlet at the tail end of the current lead wire, the other end of the second normal temperature pipeline is connected with a gas outlet of the gas return vaporizer, a current lead wire flow controller is arranged on the second normal temperature pipeline and used for controlling the flow of cold helium gas for cooling the current lead wire, so that the temperature of the current lead wire reaches a working temperature region, and the helium gas of the first normal temperature pipeline and the helium gas of the second normal temperature pipeline return to the helium gas recovery air bag; the vertical test Dewar is provided with a liquid injection port, a drain port and a heater. The utility model has the characteristics of easy operation, security height etc.
Description
Technical Field
The utility model relates to a low temperature engineering field, concretely relates to high field superconducting magnet low temperature vertical test system.
Background
The superconductor has zero resistance characteristic and complete diamagnetism at the critical temperature and below the critical magnetic field, and the temperature of the superconductor needs to be reduced to be below the critical temperature for testing the performance of the superconductor. During testing, the superconducting magnet to be tested is soaked in liquid helium, and factors such as the amount of the liquid helium in the dewar and the stability of pressure are particularly important for vertical testing due to the fact that a liquid helium low-temperature system is involved. Static heat leakage of the vertical test system, heat leakage of current leads, and quench during magnet energization testing consume liquid helium in the vertical test dewar, requiring stable replenishment of liquid helium to achieve continuous testing.
When the liquid helium level is lower than the required liquid level, the low-temperature vertical test cannot be continued, and liquid helium needs to be supplemented. In the prior art, the temperature of a liquid conveying pipe is increased by moving a liquid helium Dewar for liquid supplement at an intermediate time interval, liquid helium is lost when liquid helium is supplemented again, and meanwhile, the time for supplementing liquid helium is too long, so that the testing efficiency is reduced.
The conventional vertical test system has high requirements on technicians, so that a set of high-field superconducting magnet low-temperature vertical test system which is simple to operate, safe and reliable is needed.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing, the present invention is directed to a uniquely designed high-field superconducting magnet low-temperature vertical test system for solving the problems described in the background above.
The technical scheme of the utility model is that:
a high-field superconducting magnet cryogenic vertical test system, comprising:
the vertical testing Dewar 001 is used for storing liquid helium for vertically testing the high-field superconducting magnet, a radiation-proof screen 002 is arranged above the liquid helium surface, and the radiation-proof screen 002 is used for reducing heat transfer between the liquid helium and a top flange of the vertical testing Dewar 001;
the vertical testing Dewar 001 is provided with a pressure sensor 003 for monitoring the internal pressure of the vertical testing Dewar 001 and a liquid level meter 014 for monitoring the internal liquid level of the vertical testing Dewar 001;
a safety valve 004 is arranged on the vertical testing Dewar 001 and is used for jumping when the pressure in the vertical testing Dewar 001 reaches a jumping pressure threshold value;
the vertical test dewar 001 is provided with a rupture disk 006 for blasting the top of the vertical test dewar 001 when the pressure in the vertical test dewar 001 reaches a set blasting pressure threshold value;
the vertical test Dewar 001 is provided with an air return vaporizer 007, one end of the air return vaporizer 007 is connected with the vertical test Dewar 001 through a low-temperature pipeline, the other end of the air return vaporizer is connected with the helium recovery air bag 010 through a first normal-temperature pipeline, and the air return vaporizer is used for recovering low-temperature helium in the vertical test Dewar 001, heating the low-temperature helium to room temperature and inputting the helium to the helium recovery air bag 010; the first normal temperature pipeline comprises two parallel branches, and a safety relief valve 009 is arranged on the first branch and used for quickly relieving pressure; a pressure control valve 008 is arranged on the second branch and used for controlling the pressure of the liquid helium in the vertical test Dewar 001;
the second normal temperature pipeline is a current lead gas return pipeline, one end of the second normal temperature pipeline is connected with a gas outlet at the tail end of a current lead of the high-field superconducting magnet, the other end of the second normal temperature pipeline is connected with a gas outlet of the gas return vaporizer, the second normal temperature pipeline is provided with a current lead flow controller 013, the current lead flow controller is used for controlling the flow of cold helium gas for cooling the current lead, the temperature of the current lead is enabled to reach a working temperature region, the helium gas of the second normal temperature pipeline and the helium gas of the first normal temperature pipeline are converged at the outlet of the gas return vaporizer 007 and return to the helium gas recovery airbag 010; the vertical testing Dewar 001 is provided with a liquid injection port 005 which is used for injecting liquid nitrogen or liquid helium into the vertical testing Dewar 001;
the vertical test Dewar 001 is provided with a vent 011 and a heater 015, and is used for discharging nitrogen or connecting normal-temperature nitrogen through the vent 011, and reversely discharging liquid nitrogen from the liquid injection port 005.
Further, the top flange of the vertical testing dewar 001 is used for suspending the high-field superconducting magnet to be tested and soaking the high-field superconducting magnet in liquid helium.
Further, the takeoff pressure threshold is 1.5 bara; the burst pressure threshold is 2 bara; the safety relief valve 009 is fully opened when the pressure reaches 1.3 bar.
Further, the pressure control range of the pressure control valve 008 is 1bar to 1.3 bara.
Further, the radiation-proof screen 002 comprises 7 vertically distributed copper screens.
Furthermore, when the safety release valve 009 is opened, the liquid injection port 005 injects liquid helium into the vertical test dewar 001, and the safety release valve 009 is closed after the liquid injection is stopped.
The utility model discloses a perpendicular test system of high field superconducting magnet low temperature, protect against radiation in perpendicular test dewar 001, dewar and shield 002, pressure sensor 003, relief valve 004, annotate liquid mouth 005, rupture disk 006, return-air vaporizer 007, pressure control valve 008, safety relief valve 009, helium recovery gasbag 010, evacuation mouth 011, current lead flow controller 013, valve 012, level gauge 014, liquid helium heater 015 etc. in the dewar, the flow automatic control that the aperture of valve 012 was set for according to current lead flow controller 13.
The utility model relates to an among the preferred embodiment, control pressure 003 in the perpendicular test dewar through pressure control valve 008, can be 1bara-1.3bara according to test demand accurate control pressure range, this pressure is the saturated vapor pressure of liquid helium, the lower temperature of pressure is lower more, do benefit to the magnet test, but too low pressure can lead to the cold helium gas flow reduction of cooling current lead wire, and then loses the cooling effect, the temperature risees, so need be through liquid helium pressure in the pressure control valve 008 accurate control dewar.
The utility model relates to an among the embodiment of preferred, cold helium gas return heats to room temperature through external vaporizer 007 and returns to helium gas recovery gasbag 010, and this vaporizer uses the parallel mode, reduces loss of pressure, is favorable to the emission when the perpendicular test dewar internal pressure risees under the abnormal conditions.
The utility model relates to an among the embodiment of preferred, set up safety relief valve 009, its settlement pressure is 1.3bara, and this safety relief valve 009's valve is opened when being greater than this pressure or magnet quench chain and triggering, and this valve latus rectum is great for quick pressure release. Meanwhile, the system has a manual function, and can be manually started during system debugging.
The utility model relates to an in the embodiment of preferred, set up mechanical type relief valve 004 and rupture disk 006 for the protection to the vertical test dewar under the extreme condition.
The utility model relates to an among the implementation mode of preferred, installation superconductive level gauge 014 in the vertical test dewar is used for observing the inside liquid helium liquid level height of vertical test dewar, and after the liquid level reached a take the altitude, the liquid helium liquid level exceeded the magnet and hangs the altitude the side and can add the electric test.
The utility model relates to an among the embodiment of preferred, through annotating the liquid helium storage dewar that liquid helium refrigerator is connected to liquid mouth 005, give the vertical test dewar, stop during the test and annotate the liquid, annotate the liquid valve and maintain little aperture and prevent that the transfer line temperature from rising, when liquid helium liquid level reduces and needs to supply liquid helium, open the big liquid valve opening that annotates, supply liquid to required liquid level for the vertical test dewar.
The utility model relates to an among the embodiment of preferred, arranged one deck liquid nitrogen cold screen in the outlying vacuum intermediate layer of vertical test dewar, let in the liquid nitrogen before the vertical test dewar cooling, make the liquid nitrogen cooling maintain at the liquid nitrogen warm area to reduce the inside liquid helium of vertical test dewar and to the heat leakage of room temperature.
The utility model relates to an among the embodiment of preferred, because of high-field superconducting magnet cold mass is great, it is very big to the consumption of liquid helium simply with the liquid helium cooling, can through earlier with the liquid nitrogen cooling, let in high-pressure normal atmospheric temperature nitrogen gas behind falling liquid nitrogen warm area and the hydrops, from stretching into the transfer line discharge liquid nitrogen of perpendicular test dewar bottom, to the temperature sensor of bottom rise to the saturated liquid nitrogen warm area more than, accomplish the cooling of magnet from normal atmospheric temperature to being close the liquid nitrogen warm area.
The utility model relates to an in the implementation mode of preferred, on the pendant that is close to the vertical test dewar bottom, current lead's superconductive section and normal atmospheric temperature end set up temperature sensor.
Compared with the prior art, the utility model provides a perpendicular test system of high field superconducting magnet low temperature has following advantage:
firstly, a pressure control valve 008 is arranged and used for vertically testing pressure control of liquid helium in a Dewar, so that accurate control of pressure is realized, and the pressure control precision is high;
secondly, a large-drift-diameter safety relief valve 009 is arranged for pressure relief after pressure is rapidly increased or quench occurs during magnet testing, so as to achieve the purpose of safe operation;
thirdly, a return air vaporizer 007 is arranged to heat cold helium gas exhausted from the vertical test Dewar to normal temperature, so that the main return air pipeline is prevented from being frozen and frosted along the way;
fourthly, the return gas is connected with a helium recovery device and is recycled after being purified by a purification system.
Drawings
FIG. 1 is a schematic diagram of a high-field superconducting magnet cryogenic vertical test system.
Detailed Description
In order to more clearly illustrate the technical solution of the present invention, the following embodiments of the present invention will be further described with reference to the accompanying drawings, and it is obvious that the following embodiments in the drawings are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Referring to fig. 1, the utility model discloses a first embodiment provides a high field superconducting magnet low temperature vertical test system 000, including vertical test dewar 001, hang panel 002 that protects against radiation in the dewar on its inside top, hang level gauge 014 through the level gauge frock to place liquid helium heater 015 in the bottom, there is the end cover flange at the top of vertical test dewar 001, trompil on the flange, accessory parts such as installation pressure sensor 003, relief valve 004, notes liquid mouth 005, rupture disk 006, evacuation mouth 011. The main gas return pipeline, namely the return gas of the low-temperature pipeline enters the helium recovery air bag 010 through the gas return vaporizer 007 and the pressure control valve 008 and the safety relief valve 009 which are connected in parallel, and the helium return gas for cooling the current lead enters the helium recovery air bag 010 through the current lead flow controller 013. In this embodiment, the high-field superconducting magnet to be tested is immersed in liquid helium in a 4.2K temperature region for power-up test, liquid helium is filled through the liquid filling port 005, the liquid helium is stored in the vertical test Dewar 001, the pressure sensor 003 and the liquid level meter 014 are used for monitoring the pressure and the liquid level in the vertical test Dewar, the pressure control valve 008 controls the pressure in the vertical test Dewar according to pressure setting, the opening of the valve is opened when the pressure rises, and otherwise the opening is closed.
In this embodiment, the safety relief valve 009 sets a pressure of 1.3bara, and is greater than this pressure or the valve is opened when the magnet quench interlock triggers for rapid pressure relief. Like the pressure control valve, helium gas flowing through the valve is first heated to room temperature by vaporizer 007, then flows through the valve and enters the helium recovery bladder. In addition, the jump pressure of the safety valve 004 is 1.5bara, and the pressure of the safety valve 004 can be released after jumping, so that the pressure in the vertical Dewar is ensured not to be continuously increased; the rupture disk 006 has the rupture pressure of 2bara and forms a three-level safety interlock together with the safety relief valve 009; when the high field superconducting magnet is tested, the pressure is greater than 1.3bara, the safety relief valve 009 still cannot relieve pressure after being opened, when the pressure reaches 1.5bara, the safety valve 004 is opened, if the pressure continues to rise to 2bara, the rupture disk 006 is exploded, helium is exhausted to the atmosphere, and the safety of the vertical testing dewar is protected.
In the embodiment, in the use process of the high-field superconducting magnet low-temperature vertical test system, liquid nitrogen cooling screen cooling is firstly carried out, liquid nitrogen is filled through the liquid injection port 005, liquid nitrogen is used for precooling, liquid injection is stopped after the bottom temperature sensor reaches the liquid nitrogen temperature, and liquid nitrogen is discharged by high-pressure normal-temperature nitrogen after full soaking until the bottom temperature sensor is larger than a liquid nitrogen temperature zone, so that the liquid nitrogen is completely discharged. According to the method, liquid nitrogen is used for precooling to reduce the consumption of liquid helium.
In the embodiment, after liquid nitrogen is completely discharged, helium gas replacement is performed on the vertical test dewar through the evacuation port 011 by using a vacuum pump, after the helium gas is sufficiently replaced, the safety relief valve 009 is manually opened, so that the vertical test dewar is communicated with the helium gas recovery air bag 010, and liquid helium is filled through the liquid filling port 005 until the liquid level of the liquid helium reaches the liquid level required by the magnet test.
In this embodiment, after stopping injecting liquid, the safety relief valve 009 is closed, and is adjusted to an automatic interlocking state, and the pressure control valve 008 controls the pressure of liquid helium in the dewar to be vertically tested, and at the same time, the current lead flow controller 013 is adjusted, so that the temperature of the current lead reaches the working temperature region, and at this time, the superconducting magnet to be tested has the test conditions.
In this embodiment, quench is caused during the magnet energization test, the generated heat consumes the liquid helium and brings pressure rise, the pressure control valve 008 automatically adjusts the pressure, and the safety relief valve 009 is opened to quickly relieve pressure if the pressure continues to rise after the full opening. And when the liquid helium level does not meet the liquid level required by the magnet test, the liquid supplementing valve can be opened to supplement the liquid helium.
In this embodiment, after the test is finished, the remaining liquid helium needs to be evaporated into helium gas, the helium gas enters the helium gas recovery air bag 010, the liquid nitrogen injection of the liquid nitrogen cold screen is stopped, the liquid helium heater 015 in the dewar is turned on, and the liquid helium is evaporated through the heater. When the temperature of the bottom in the Dewar is higher than the temperature of liquid helium, a connecting valve of the gas helium recovery air bag can be closed, an evacuation port 011 is opened, and normal-temperature nitrogen is blown in to accelerate the vertical test of the Dewar rewarming.
Although the above embodiments have been described in detail, those skilled in the art can make substitutions, modifications and simple changes without departing from the scope of the present invention, and these substitutions, modifications and simple changes cannot make the essence of the corresponding technical solution depart from the scope of the embodiments of the present invention.
Claims (6)
1. A high-field superconducting magnet cryogenic vertical test system, comprising:
the vertical testing Dewar (001) is used for storing liquid helium for vertically testing the high-field superconducting magnet, a radiation-proof screen (002) is arranged above the liquid helium surface, and the radiation-proof screen (002) is used for reducing heat transfer between the liquid helium and a top flange of the vertical testing Dewar (001);
the vertical testing Dewar (001) is provided with a pressure sensor (003) for monitoring the internal pressure of the vertical testing Dewar (001) and a liquid level meter (014) for monitoring the internal liquid level of the vertical testing Dewar (001);
the vertical testing Dewar (001) is provided with a safety valve (004) for jumping when the pressure in the vertical testing Dewar (001) reaches a jumping pressure threshold value;
the vertical testing Dewar (001) is provided with a rupture disk (006) for blasting the top of the vertical testing Dewar (001) when the pressure in the vertical testing Dewar (001) reaches a set blasting pressure threshold value;
the vertical test Dewar (001) is provided with an air return vaporizer (007), one end of the air return vaporizer is connected with the vertical test Dewar (001) through a low-temperature pipeline, the other end of the air return vaporizer is connected with a helium recovery air bag (010) through a first normal-temperature pipeline, and the air return vaporizer is used for recovering low-temperature helium in the vertical test Dewar (001), heating the low-temperature helium to room temperature and inputting the helium to the helium recovery air bag (010); the first normal temperature pipeline comprises two parallel branches, and a safety relief valve (009) is arranged on the first branch and used for quickly relieving pressure; a pressure control valve (008) is arranged on the second branch and used for controlling the pressure of the liquid helium in the vertical test Dewar (001);
the second normal temperature pipeline is a current lead gas return pipeline, one end of the second normal temperature pipeline is connected with a gas outlet at the tail end of a current lead of the high-field superconducting magnet, the other end of the second normal temperature pipeline is connected with a gas outlet of a gas return vaporizer (007), the second normal temperature pipeline is provided with a current lead flow controller (013), the current lead flow controller (013) is used for controlling the flow of cold helium for cooling the current lead, the temperature of the current lead is enabled to reach a working temperature region, the helium of the second normal temperature pipeline and the helium of the first normal temperature pipeline are converged at the outlet of the gas return vaporizer (007) and returned to the helium recovery air bag (010);
the vertical testing Dewar (001) is provided with a liquid injection port (005) for injecting liquid nitrogen or liquid helium into the vertical testing Dewar (001);
the vertical testing Dewar (001) is provided with a drain port (011) and a heater (015) and is used for discharging nitrogen or connecting normal-temperature nitrogen through the drain port (011) and reversely discharging liquid nitrogen from the liquid injection port (005).
2. The high-field superconducting magnet cryogenic vertical test system of claim 1, wherein a top flange of the vertical test dewar (001) is used to suspend the high-field superconducting magnet to be tested for immersion in liquid helium.
3. The high-field superconducting magnet cryogenic vertical test system of claim 1, wherein the kick-off pressure threshold is 1.5 bara; the burst pressure threshold is 2 bara; the safety relief valve (009) is fully open when the pressure reaches 1.3 bar.
4. The high-field superconducting magnet cryogenic vertical test system according to claim 3, wherein the pressure control range of the pressure control valve (008) is 1bar-1.3 bara.
5. The high-field superconducting magnet cryogenic vertical test system of claim 1, wherein the radiation-protective shield (002) comprises a vertically distributed 7-layer copper shield.
6. The high-field superconducting magnet cryogenic vertical test system according to claim 1, wherein when the safety relief valve (009) is opened, the liquid injection port (005) injects liquid helium into the vertical test dewar (001), and the safety relief valve (009) is closed after stopping injecting liquid helium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220004954.XU CN217213104U (en) | 2022-01-04 | 2022-01-04 | High-field superconducting magnet low-temperature vertical test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220004954.XU CN217213104U (en) | 2022-01-04 | 2022-01-04 | High-field superconducting magnet low-temperature vertical test system |
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| Publication Number | Publication Date |
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| CN217213104U true CN217213104U (en) | 2022-08-16 |
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| CN202220004954.XU Active CN217213104U (en) | 2022-01-04 | 2022-01-04 | High-field superconducting magnet low-temperature vertical test system |
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| CN (1) | CN217213104U (en) |
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- 2022-01-04 CN CN202220004954.XU patent/CN217213104U/en active Active
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