A superconducting switch test system

Abstract

The invention discloses a superconducting switch test system, comprising a test container provided with a refrigeration device, a first container provided in the test container, a cold shield provided on the outer side of the first container, a superconducting coil nested in the first container so that the superconducting coil serves as a part of the inner wall of the first container, a high-temperature superconducting current lead assembly provided in the test container, the upper part of the high-temperature superconducting current lead assembly provided outside the test container and used to connect an external power supply, the middle part of the high-temperature superconducting current lead assembly connected to the cold shield through a first cold wire, the lower part of the high-temperature superconducting current lead assembly connected to the superconducting coil through a cable, the superconducting coil, the first container and the cold shield are respectively connected to the refrigeration device through a second cold wire; and a switch device, the switch device comprising a test device flange, a pull rod suspended on the test device flange, and the lower end of the pull rod used to connect the test switch. Liquid helium consumption is significantly reduced to reduce the test cost.

Description

Technical Field

[0001] The present invention relates to the technical field of superconducting magnets, and more particularly to a superconducting switch testing system. Background Art

[0002] A conventional switch test device pre-fixes the switch inside a background field superconducting coil, where the coil and the switch form a whole. During the test phase, the switch test device needs to be placed as a whole into the first container of the switch test system, and the placement process consumes a large amount of liquid helium.

[0003] like Figure 3 As shown, in the switch testing device of the prior art, the coil and the switch are fixed together, put into the first container of the testing system at the same time, and are pulled out from the first container at the same time. Since the coil needs to be reused, the switch needs to be replaced frequently, which makes the operation more complicated.

[0004] In addition, the tower has a detachable current lead. During excitation, the current lead needs to be cooled by liquid helium evaporation to work properly. Liquid helium will be consumed during the excitation process. In order to ensure the safety of excitation, sufficient liquid helium needs to be stored in the first container. The coil has a large thermal mass and consumes more liquid helium. After the switch test, the coil needs to be demagnetized. The coil excitation and demagnetization are frequent, with many operations, long time, and complex processes, and the excitation and demagnetization liquid helium consumption is high.

[0005] Therefore, how to solve the problem of high testing costs caused by excessive consumption of liquid helium is an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a superconducting switch testing system, which reduces the consumption of liquid helium to reduce the testing cost and improves the switch testing efficiency.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A superconducting switch test system, comprising a test container provided with a refrigeration device, wherein a first container is provided in the test container, a cold shield is provided on the outer side of the first container, a superconducting coil is nested in the side wall of the first container so that the superconducting coil serves as a part of the inner wall of the first container, the test container is provided with a high-temperature superconducting current lead assembly, the upper part of the high-temperature superconducting current lead assembly is arranged outside the test container and is used to connect an external power supply, the middle part of the high-temperature superconducting current lead assembly is connected to the cold shield through a first cold wire, the lower part of the high-temperature superconducting current lead assembly is connected to the superconducting coil through a cable, and the superconducting coil, the first container and the cold shield are respectively connected to the refrigeration device through a second cold wire;

[0009] It also includes a switch device, which includes a test device flange. A pull rod is provided on the test device flange, and the lower end of the pull rod is used to connect a test switch.

[0010] Preferably, a superconducting switch is provided between the cold shield and the first container, and the superconducting switch is respectively connected to the superconducting coil, the first container and the refrigeration device through a third cold wire.

[0011] Preferably, the first cooling wire, the second cooling wire and the third cooling wire are all copper wires.

[0012] Preferably, the first cooling wire, the second cooling wire and the third cooling wire are all aluminum wires.

[0013] Preferably, the refrigeration device comprises a cold head and a cold head container wrapped around the outside of the cold head, the cold head container is connected to the first container, and the superconducting coil is connected to the bottom of the cold head container through the second cold wire.

[0014] Preferably, the superconducting coil is connected to the first container by welding.

[0015] Preferably, the lower portion of the high-temperature superconducting current lead assembly is connected to the cable by soldering.

[0016] Preferably, at least three tie rods are suspended on the flange of the testing device.

[0017] The superconducting switch testing system provided by the present invention has the following beneficial effects:

[0018] First, only the test switch is hung on the switch device, and the skeleton of the superconducting coil is nested with the first container, so that the inner wall of the skeleton of the superconducting coil serves as the inner wall of the first container. In this way, when the switch is frequently replaced during the test, there is no need to repeatedly soak and excite the superconducting coil, which can improve the test efficiency and save liquid helium consumption.

[0019] Second, the superconducting coil, the first container and the cold screen are respectively connected to the refrigeration device through the second cold wire. In this way, the first container and the superconducting coil can be cooled from room temperature 300K to the 4K temperature zone through the refrigeration device, that is, the refrigerator can directly cool the superconducting coil to 4K. The cooling process does not consume liquid helium. Only a small amount of helium needs to be added to maintain the positive pressure of the first container, which significantly reduces the consumption of liquid helium when the superconducting coil is cooled. During steady-state operation, the system can achieve zero volatilization. In addition, when there is no liquid helium in the first container, the superconducting coil can still maintain a superconducting state through the refrigerator.

[0020] Third, the superconducting coil is excited through the high-temperature superconducting current lead assembly. When the current reaches the requirement, the current closed-loop operation can be realized through the superconducting switch and the superconducting coil. Then the external power supply can be turned off without the need to reduce the field.

[0021] Fourth, multiple switches can be hung on the switch device for current-carrying testing to improve test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 A schematic diagram of a specific embodiment of a superconducting switch testing system provided by the present invention;

[0024] Figure 2 is a schematic diagram of a switch device;

[0025] Figure 3 It is a schematic diagram of a switch testing device of the prior art.

[0026] Among them, 1-test container, 2-first container, 3-cold shield, 4-refrigeration device, 5-superconducting coil, 6-high-temperature superconducting current lead assembly, 7-first cold wire, 8-second cold wire, 9-test device flange, 10-pull rod, 11-test switch, 12-superconducting switch, 13-third cold wire, 14-cold head container, 15-cable. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The core of the present invention is to provide a superconducting switch testing system, which reduces the consumption of liquid helium to reduce the testing cost and improves the switch testing efficiency.

[0029] Please refer to Figures 1 to 3 , Figure 1 A schematic diagram of a specific embodiment of a superconducting switch testing system provided by the present invention; Figure 2 is a schematic diagram of a switch device; Figure 3 It is a schematic diagram of a switch testing device of the prior art.

[0030] The superconducting switch test system provided by the present invention comprises a test container 1 provided with a refrigeration device 4, wherein a first container 2 is provided in the test container 1, a cold shield 3 is sleeved on the outer side of the first container 2, a superconducting coil 5 is nested in the first container 2 so that the superconducting coil 5 serves as a part of the inner wall of the first container 2, a high-temperature superconducting current lead assembly 6 is provided on the test container 1, the upper part of the high-temperature superconducting current lead assembly 6 is arranged outside the test container 1 and is used to connect the power supply cable of the external power supply, the middle part of the high-temperature superconducting current lead assembly 6 is connected to the cold shield 3 through a first cold wire 7, the lower part of the high-temperature superconducting current lead assembly 6 is connected to the superconducting coil 5 through a cable 15, and the superconducting coil 5, the first container 2 and the cold shield 3 are respectively connected to the refrigeration device 4 through a second cold wire 8; and also comprises a switch device, wherein the switch device comprises a test device flange 9, a pull rod 10 is suspended on the test device flange 9, and the lower end of the pull rod 10 is used to connect the test switch 11.

[0031] The superconducting switch test system provided by the present invention separates the superconducting coil 5 from the conventional switch test device, and only hangs the test switch 11 on the switch device, and the skeleton of the superconducting coil 5 is welded to the first container 2, so that the inner wall of the skeleton of the superconducting coil 5 serves as the inner wall of the first container 2. Therefore, during the test process, when the switch is frequently replaced, it is not necessary to repeatedly soak and excite the superconducting coil 5, and the superconducting coil 5 no longer needs to be soaked in liquid helium, which can improve the test efficiency and save liquid helium consumption.

[0032] The first container 2 is a 4K container. During the test, the first container 2 and the superconducting coil 5 can be cooled from room temperature 300K to a 4K temperature range by a refrigeration device 4. The cold shield is a 50K cold shield, and the cable 15 is a 4K cable.

[0033] The high temperature superconducting current lead assembly 6 is fixed on the test container 1, and the high temperature superconducting current lead assembly 6 is arranged outside the test container 1. The upper end of the high temperature superconducting current lead assembly 6 is used to connect the external power supply cable, the middle section of the high temperature superconducting current lead assembly 6 and the cold shield 3 are cooled by the first cold wire 7, and the lower end of the high temperature superconducting current lead assembly 6 is connected to the superconducting coil 5 by soldering through the cable 15. It is permanently fixed without plugging and unplugging.

[0034] At the same time, the superconducting coil 5, the first container 2 and the cold shield 3 are respectively connected to the refrigeration device 4 through the second cold wire 8. In this way, the first container 2 and the superconducting coil 5 can be cooled from the room temperature of 300K to the 4K temperature zone through the refrigeration device 4, that is, the refrigerator can directly cool the superconducting coil 5 to 4K. The cooling process does not consume liquid helium, and only a small amount of helium needs to be added to maintain the positive pressure of the first container 2, which significantly reduces the consumption of liquid helium when the superconducting coil 5 is cooled. During steady-state operation, the system can achieve zero volatilization. In addition, when there is no liquid helium in the first container 2, the superconducting coil 5 can still maintain a superconducting state through the refrigerator.

[0035] After the external power supply is connected to the upper end of the high-temperature superconducting current lead assembly 6, the superconducting coil 5 can be excited through the high-temperature superconducting current lead assembly 6. After the current reaches the requirement, the current closed-loop operation can be realized through the superconducting switch 12 and the superconducting coil 5, and then the external power supply can be turned off to reduce energy consumption.

[0036] Multiple switches can be hung on the switch test device for current carrying test, and there is no limit on the specific number of switches to improve the test efficiency. The superconducting coil 5 does not need to be soaked in liquid helium. With a small amount of liquid helium or a small amount of helium gas, the coil can be operated in the 4K temperature range through heat exchange with the second stage of the cold head to achieve superconductivity.

[0037] On the basis of the above embodiment, as a preference, a superconducting switch 12 is provided between the cold shield 3 and the first container 2 , and the superconducting switch 12 is respectively connected to the superconducting coil 5 , the first container 2 and the refrigeration device 4 through a third cold wire 13 .

[0038] In this embodiment, after the external power supply is connected to the upper end of the high-temperature superconducting current lead assembly 6, the superconducting coil 5 can be excited through the high-temperature superconducting current lead assembly 6. After the current reaches the requirement, the current closed-loop operation can be realized through the superconducting switch 12 and the superconducting coil 5, and then the external power supply can be turned off without the need to reduce the field.

[0039] On the basis of the above embodiment, considering the specific selection of the first cold wire 7, the second cold wire 8 and the third cold wire 13, as a preferred embodiment, the first cold wire 7, the second cold wire 8 and the third cold wire 13 are all copper wires. As another preferred embodiment, the first cold wire 7, the second cold wire 8 and the third cold wire 13 are all aluminum wires.

[0040] On the basis of the above embodiments, taking into account the specific setting method of the refrigeration device 4, as a preferred embodiment, the refrigeration device 4 includes a cold head and a cold head container 14 wrapped around the outside of the cold head, the cold head container 14 is connected to the first container 2, and the superconducting coil 5 is connected to the bottom of the cold head container 14 through the second cold wire 8.

[0041] The superconducting coil 5 can be directly cooled to 4K by a refrigerator. The cooling process does not consume liquid helium. Only a small amount of helium needs to be added to maintain the positive pressure of the first container 2, which significantly reduces the consumption of liquid helium when the superconducting coil 5 is cooled. During steady-state operation, the system can achieve zero volatilization. In addition, when there is no liquid helium in the first container 2, the superconducting coil 5 can still maintain a superconducting state through the refrigerator.

[0042] On the basis of the above embodiment, considering the specific connection mode between the superconducting coil 5 and the first container 2, as a preferred embodiment, the superconducting coil 5 is connected to the first container 2 by welding. Considering the specific connection mode between the lower part of the high-temperature superconducting current lead assembly 6 and the cable 15, as a preferred embodiment, the lower part of the high-temperature superconducting current lead assembly 6 is connected to the cable 15 by soldering.

[0043] Based on the above embodiment, as a preferred embodiment, at least three pull rods 10 are hung on the flange 9 of the testing device to ensure the testing efficiency and testing effect.

[0044] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0045] The superconducting switch test system provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A superconducting switch test system, comprising a test container (1) provided with a refrigeration device (4), wherein a first container (2) is provided in the test container (1), and a cold shield (3) is provided on the outer side of the first container (2), characterized in that: The first container (2) is nested with a superconducting coil (5), so that the superconducting coil (5) serves as a part of the inner wall of the first container (2), and the superconducting coil (5) is welded to the first container (2); The test container (1) is provided with a high-temperature superconducting current lead assembly (6); the upper portion of the high-temperature superconducting current lead assembly (6) is arranged outside the test container (1) and is used to connect to an external power source; the middle portion of the high-temperature superconducting current lead assembly (6) is connected to the cold shield (3) via a first cold wire (7); the lower portion of the high-temperature superconducting current lead assembly (6) is connected to the superconducting coil (5) via a cable (15); the superconducting coil (5), the first container (2) and the cold shield (3) are respectively connected to the refrigeration device (4) via a second cold wire (8); It also includes a switch device, the switch device includes a test device flange (9), the test device flange (9) is provided with a pull rod (10), and the lower end of the pull rod (10) is used to connect a test switch (11); A superconducting switch (12) is provided between the cold shield (3) and the first container (2), and the superconducting switch (12) is respectively connected to the superconducting coil (5), the first container (2) and the refrigeration device (4) through a third cold wire (13); The refrigeration device (4) comprises a cold head and a cold head container (14) wrapped around the outside of the cold head, the cold head container (14) is connected to the first container (2), and the superconducting coil (5) is connected to the bottom of the cold head container (14) through the second cold wire (8).

2. The superconducting switch testing system according to claim 1, characterized in that: The first cooling wire (7), the second cooling wire (8) and the third cooling wire (13) are all copper wires.

3. The superconducting switch testing system according to claim 1, characterized in that: The first cooling wire (7), the second cooling wire (8) and the third cooling wire (13) are all aluminum wires.

4. The superconducting switch testing system according to claim 1, characterized in that: The lower part of the high-temperature superconducting current lead assembly (6) is connected to the cable (15) by soldering.

5. The superconducting switch testing system according to any one of claims 1 to 4, characterized in that: At least three pull rods (10) are suspended on the testing device flange (9).

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