Low temperature superconducting magnet leadthrough

Abstract

The application belongs to the technical field of low-temperature superconducting magnet, and discloses a low-temperature superconducting magnet electricity leading device, which comprises a Dewar flask, an electricity leading rod and a low-temperature superconducting magnet, the Dewar flask is provided with a liquid helium storage tank and a top plate, and further comprises: an inclined angle conduit which penetrates from the top plate into the liquid helium storage tank and is used for guiding the electricity leading rod to be obliquely inserted into the Dewar flask; a magnet pushing inlet which is arranged at the bottom end of the Dewar flask and is communicated with the liquid helium storage tank, the magnet pushing inlet is used for moving the low-temperature superconducting magnet into the liquid helium storage tank, and an operation gap is arranged between the magnet pushing inlet and the low-temperature superconducting magnet before the low-temperature superconducting magnet is completely pushed into the Dewar flask by the magnet pushing inlet; a plug is arranged at the bottom end of the electricity leading rod; a socket is used for being connected with the plug, the connection between the electricity leading rod and the low-temperature superconducting magnet is not limited by the narrow neck pipe structure space of the Dewar flask, the installation in place is very accurate, the operation is convenient, and time and labor are saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-temperature superconducting magnet power supply, and particularly relates to a low-temperature superconducting magnet power lead device. BACKGROUND

[0002] At present, the wet refrigeration technology is widely used, and the wet refrigeration equipment usually has a low-temperature superconducting magnet and a liquid helium Dewar bottle, and needs to be used in cooperation with a power lead capable of supplying power to the low-temperature superconducting magnet from a room temperature power supply. The power lead needs to pass through the socket on the top plate of the liquid helium Dewar bottle, be inserted into the power lead pipe, and be always inserted into the liquid helium in the Dewar bottle.

[0003] Low-temperature superconducting magnet with 3 The He system or dilution refrigerator and other ultra-low temperature equipment need to have multiple groups of power leads to provide power for the operation of the low-temperature superconducting magnet. In order to reduce the heat loss of the liquid helium, the Dewar bottle is usually provided with a neck-shaped pipe with a very small caliber at the top. Sometimes the low-temperature superconducting magnet has magnetic fields in several directions, which requires several groups of power leads. Due to the limitation of the structure of the neck-shaped pipe and the position of the low-temperature superconducting magnet, the power lead can only be inserted into the Dewar bottle from the neck-shaped pipe of the Dewar bottle and be installed from top to bottom; the low-temperature superconducting magnet is inserted into the Dewar bottle from the lower part of the Dewar bottle, and the conventional lead wire at the bottom end of the power lead is connected with the superconducting lead wire of the low-temperature superconducting magnet. This installation form of the low-temperature superconducting magnet is called bottom loading.

[0004] Due to the very narrow space at the neck-shaped pipe, when the power lead inserted into the liquid helium storage tank from top to bottom is connected with the lead wire of the low-temperature superconducting magnet below, the operation is very inconvenient and time-consuming and laborious. SUMMARY

[0005] The present application aims to provide a low-temperature superconducting magnet power lead device, the connection of the power lead and the low-temperature superconducting magnet is not limited by the narrow neck-shaped pipe structure space of the Dewar bottle, and the installation in place can be accurately realized, the operation is convenient, time-saving and labor-saving.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] A low-temperature superconducting magnet power lead device, comprising a Dewar bottle, a power lead and a low-temperature superconducting magnet, the Dewar bottle is provided with a liquid helium storage tank and a top plate, and further comprising:

[0008] An inclined angle pipe, the inclined angle pipe is inclinedly arranged, the inclined angle pipe penetrates from the top plate into the liquid helium storage tank, and is used for guiding the power lead to be inclinedly inserted into the Dewar bottle, and can guide the power lead to be inclinedly inserted into the Dewar bottle;

[0009] A magnet push-in port is arranged at the bottom end of the Dewar bottle and communicates with the liquid helium storage tank, and the magnet push-in port is used for moving the low-temperature superconducting magnet into the liquid helium storage tank, and an operation gap is arranged between the magnet push-in port and the low-temperature superconducting magnet before the low-temperature superconducting magnet is completely pushed into the Dewar bottle by the magnet push-in port.

[0010] A plug is arranged at the bottom end of the electric lead rod.

[0011] A socket is arranged for connecting with the plug, and the socket is movably connected with the low-temperature superconducting magnet.

[0012] Preferably, a heat radiation baffle is arranged on the electric lead rod to prevent the radiation rays from the upper part from shining downward.

[0013] Preferably, an aluminum foil is attached to the surface of the heat radiation baffle.

[0014] Preferably, the electric lead rod comprises two brass tubes parallel to the inclined angle conduit, and a plurality of heat radiation baffles are arranged along the axial direction of the electric lead rod.

[0015] Preferably, the heat radiation baffles are provided with air holes, and the air holes on adjacent heat radiation baffles are arranged staggeredly.

[0016] Preferably, a hole is arranged at the top end of the socket for inserting the plug, and the socket can rotate in the plug.

[0017] Preferably, a support frame is arranged between the socket and the low-temperature superconducting magnet, one end of the support frame is fixedly connected with the low-temperature superconducting magnet, the other end is movably connected with the socket, and the rotation axis is arranged horizontally to change the inclination angle of the socket.

[0018] Preferably, a wire winding column is arranged at the bottom of the plug.

[0019] Preferably, a magnet fixing disc and an indium ring sealing flange bottom disc are arranged at the bottom of the low-temperature superconducting magnet in sequence.

[0020] Preferably, a plurality of cooling channels are arranged at the bottom of the magnet fixing disc.

[0021] The present application has the following beneficial effects:

[0022] The electric lead rod is inserted into the inclined angle guide pipe from the upper side of the Dewar bottle, and after passing through the top plate and the inclined angle guide pipe, the electric lead rod enters the liquid helium storage tank. The low-temperature superconducting magnet is inserted into the magnet pushing port from the eccentric position at the lower side of the Dewar bottle, and the bottom end of the electric lead rod is close to the top end of the low-temperature superconducting magnet. Since the low-temperature superconducting magnet is located at the eccentric position of the Dewar bottle, there is a gap between the low-temperature superconducting magnet and the Dewar bottle, forming an operation gap. Through the operation gap, the plug on the electric lead rod is connected with the socket on the low-temperature superconducting magnet, and the conventional lead wire at the bottom end of the electric lead rod is stably connected with the superconducting lead wire of the low-temperature superconducting magnet. Since the electric lead rod has been connected with the low-temperature superconducting magnet at this time, the low-temperature superconducting magnet continues to move upward until it is completely moved into the liquid helium storage tank. At the same time, the electric lead rod also moves upward in the inclined angle guide pipe until the top end of the electric lead rod passes through the top plate and is connected with the room temperature power supply outside the Dewar bottle. Compared with the prior art in which the electric lead rod is vertically inserted into the narrow neck pipe of the Dewar bottle, the present application solves the contradiction between the installation of the large-size low-temperature superconducting magnet at the bottom and the requirement of the smallest caliber of the neck pipe of the Dewar bottle. When the low-temperature superconducting magnet has multiple direction magnetic fields, multiple inclined angle guide pipes can be arranged to enable multiple electric lead rods to be inserted into the liquid helium storage tank at different angles and directions to be connected with the low-temperature superconducting magnet. Multiple groups of electric lead rods can be arranged to work simultaneously to provide power, which is convenient to operate, saves time and effort, the working state of the magnet is good, the current supply is stable, the heat loss caused is small, there is no quenching, the helium saving effect is obvious, and the economic benefit is considerable. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the low-temperature superconducting magnet electric lead device in the present application;

[0024] Figure 2 is a structural schematic diagram of the electric lead rod of the low-temperature superconducting magnet electric lead device in the present application;

[0025] Figure 3 is Figure 2 is a partial schematic diagram of A in the present application;

[0026] Figure 4 is a structural schematic diagram of the magnet fixing disc and the installation tray in the present application;

[0027] Figure 5 is a structural schematic diagram of the cooling channel on the installation tray in the present application;

[0028] Figure 6 is a structural schematic diagram of the plug in the present application;

[0029] Figure 7 is a structural schematic diagram of the socket in the present application;

[0030] Figure 8 is a partial schematic diagram of the socket in the present application;

[0031] Figure 9 is a partial sectional view of the low-temperature superconducting magnet pushing process in the present application;

[0032] Figure 10 is a sectional view of the plug and socket connection in the present application;

[0033] Figure 11 is a structural schematic view of the low-temperature superconducting magnet power lead installation in the present application.

[0034] In the figure: 1, Dewar flask; 11, liquid helium storage tank; 111, liquid helium storage tank; 112, liquid helium storage tail pipe; 113, neck tube; 12, top plate; 121, power lead rod insertion port; 13, vacuum cavity shell; 113, heat radiation prevention bottle; 15, magnet pushing port; 16, bottom plate; 17, operation gap; 2, power lead rod; 21, top mounting flange; 22, upper end copper terminal post; 23, power supply connection clip; 24, electrically insulating sleeve; 25, fixing clasp; 26, traction rope; 3, low-temperature superconducting magnet; 31, magnet fixing disc; 311, cooling channel; 32, indium ring sealing flange bottom disc; 33, liquid level gauge; 4, inclined angle guide pipe; 5, heat radiation baffle; 51, air hole; 52, aluminum foil; 6, plug; 61, excess wire winding post; 7, socket; 71, power lead rod in-place hole; 72, winding post in-place hole; 73, support frame; 731, support block; 732, support column; 733, first support frame; 734 second support frame; 7341 rotation shaft; 8, wire passage hole. DETAILED DESCRIPTION

[0035] The application will be further described below in conjunction with the drawings and examples. It should be understood that the specific examples described herein are intended to be illustrative only and are not in any way limiting of the application. In addition, it should be noted that only the parts related to the present application are shown in the drawings for the sake of convenience of description.

[0036] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0039] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1 As shown, this embodiment provides a cryogenic superconducting magnet energizing device, including a Dewar flask 1, an energizing rod 2, and a cryogenic superconducting magnet 3. A plug 6 is provided at the bottom end of the energizing rod 2, and a socket 7 for connecting to the plug 6 is movably connected to the top end of the cryogenic superconducting magnet 3. An inclined angled conduit 4 is provided inside the Dewar flask 1, and a magnet push-in port 15 is provided at the bottom end of the Dewar flask 1. Before the cryogenic superconducting magnet 3 is completely pushed into the Dewar flask 1 through the magnet push-in port 15, an operating gap 17 is provided between the magnet push-in port 15 and the cryogenic superconducting magnet 3. The lead rod 2 is inserted obliquely into the angled conduit 4 from the upper side of the Dewar flask 1 and enters the Dewar flask 1. The low-temperature superconducting magnet 3 enters the Dewar flask 1 from the magnet push-in 15 at the bottom end. The plug 6 and socket 7 are connected from the operating gap 17. The conventional lead at the bottom end of the lead rod 2 is connected to the superconducting lead of the low-temperature superconducting magnet 3. Then the low-temperature superconducting magnet 3 is completely pushed into the Dewar flask 1. It is not restricted by the narrow neck tube 113 structure of the Dewar flask 1. The operation is convenient, time-saving and labor-saving.

[0041] The Dewar 1 comprises a liquid helium storage tank 11 and a vacuum cavity shell 13 arranged outside the liquid helium storage tank 11, the vacuum cavity shell 13 is made of aluminum, and a multi-layer heat radiation prevention bottle 14 treated by vacuumizing is arranged between the vacuum cavity shell 13 and the liquid helium storage tank 11. A top plate 12 is arranged above the vacuum cavity shell 13, and an electric lead rod insertion port 121 is arranged on the top plate 12, the electric lead rod insertion port 121 is arranged at an eccentric position of the top plate 12. The liquid helium storage tank 11 is sequentially provided with a neck pipe 113, a liquid helium storage tank 111 and a liquid helium storage tail pipe 112 from top to bottom. The diameter of the neck pipe 113 is very small to avoid loss of liquid helium; the diameter of the liquid helium storage tank 111 is larger to serve as the main liquid helium storage space; and the diameter of the liquid helium storage tail pipe 112 is smaller to place the low-temperature superconducting magnet 3 so that the low-temperature superconducting magnet 3 is surrounded by liquid helium.

[0042] An inclined angle conduit 4 is arranged in the vacuum cavity shell 13, and a top end of the inclined angle conduit 4 is in communication with the electric lead rod insertion port 121, and a bottom end of the inclined angle conduit 4 is in communication with the liquid helium storage tank 111. The inclined angle conduit 4 penetrates from the top plate 12 into the liquid helium storage tank 111, and the inclined angle conduit 4 is arranged in an inclined manner, and the bottom end of the inclined angle conduit 4 is close to the center line of the Dewar 1.

[0043] As shown in Figure 2 , the electric lead rod 2 comprises two brass pipes, specifically, the brass pipes are brass thick-walled pipes, and of course other conductive materials can be used, such as high-temperature superconducting materials, but the price of the high-temperature superconducting materials is relatively high. A top mounting flange plate 21 is arranged at a top portion of the electric lead rod 2, and is used to be mounted and fixed with a flange plate of the electric lead rod insertion port 121, and an upper end copper terminal post 22, an electric insulating sleeve 24 and a power supply connecting clip 23 are further arranged at the top end of the electric lead rod 2. A plurality of fixed clamping rings 25 are arranged on the electric lead rod 2, so that the two brass pipes are kept in a stable state of relative parallelism. The fixed clamping ring 25 is provided with a plurality of small wire passing holes 8 for passing the related data signal lines of the equipment.

[0044] Looking back Figure 1 , the electric lead rod 2 is inserted into the inclined angle conduit 4 in an inclined manner, and is inserted into the Dewar 1 through the inclined angle conduit 4, and the inclined angle conduit 4 plays a guiding role.

[0045] As shown in Figure 2 and Figure 3As shown, the electric pole 2 is provided with a plurality of heat radiation baffles 5 arranged along the axial direction of the electric pole 2. The heat radiation baffles 5 also have the function of fixing the clamping ring 25, so that the structure of the electric pole 2 is more stable. The heat radiation baffles 5 in the embodiment are circular baffles made of non-metallic material epoxy resin laminated alkali-free glass fiber cloth (G-10), which have high strength and wear resistance and are very light in weight. The upper and lower surfaces of the heat radiation baffles 5 are attached with aluminum foil 52, so that the heat radiation baffles 5 can block the downward radiation of the radiation from above and have good heat radiation prevention effect. The heat radiation baffles 5 are provided with a plurality of small wire passing holes 8 for passing the data signal lines of the equipment. The electric pole 2 and the heat radiation baffles 5 slide into the Dewar flask 1 along the inclined angle conduit 4 from top to bottom. Referring back to Figure 1 In order to facilitate the connection of the lower end of the electric pole 2 with the low-temperature superconducting magnet 3, a pulling rope 26 can be arranged at the upper end of the electric pole 2. After the lower end of the electric pole 2 is connected with the wire of the low-temperature superconducting magnet 3, the pulling rope 26 is pulled upward to make the electric pole 1 in place, and then the pulling rope 26 is released.

[0046] As shown in Figure 2 and Figure 3 , the heat radiation baffles 5 are provided with air holes 51, and the air holes 51 on adjacent heat radiation baffles 5 are staggered. When the Dewar flask 1 contains liquid helium, the helium vapor will rise along the inclined angle conduit 4 and finally be discharged from the top. Because the heat radiation baffles 5 are thermally coupled with the electric pole 2, the helium vapor cools the multiple layers of heat radiation baffles 5 during the rising process by means of evaporation sensible heat, and in addition, the rising helium vapor also comes into good contact with the electric pole 2 made of brass, which also cools the electric pole 2 made of thick-walled brass pipe. The electric pole 2 has good electrical conductivity, which can not only ensure the power supply demand of large current, but also can not produce large heat conduction leakage under the cooling condition of helium vapor, which avoids the cost pressure of using high-temperature superconducting material for the electric pole 2. Because the air holes 51 on the heat radiation baffles 5 are staggered and through, the helium vapor can rise spirally along a snake-shaped path (see Figure 9 ), but the radiation from above still cannot be irradiated downward. The heat radiation can not only reflect the heat radiation, but also pre-cool the helium vapor, which has good cooling effect, reduces conduction heat leakage, and supplies large current to the magnet. The electric pole 2 made of brass is selected in the embodiment, which has good electrical conductivity, and the thermal conductivity of brass is general, but it is completely comparable to the electric pole 2 made of high-temperature superconducting material, which has high cost performance.

[0047] As shown in Figure 1As shown, the bottom end of the Dewar flask 1 is provided with a magnet pushing opening 15, which penetrates the vacuum cavity shell 13 and the multilayer heat radiation bottle 131, and communicates with the bottom of the liquid helium storage tank 11. The magnet pushing opening 15 is integrally downwardly and open, and the size of the magnet pushing opening 15 is larger than that of the low-temperature superconducting magnet 3, so that the low-temperature superconducting magnet 3 can be pushed upward from the lowest point of the magnet pushing opening 15 and close to the center line of the Dewar flask 1, that is, the low-temperature superconducting magnet 3 can be moved into the liquid helium storage tank 11. During the process, an operation gap 17 is provided between the magnet pushing opening 15 and the low-temperature superconducting magnet 3.

[0048] The bottom of the low-temperature superconducting magnet 3 is provided with a magnet fixing disc 31 and an indium ring sealing flange bottom disc 32, and the magnet fixing disc 31 is located between the low-temperature superconducting magnet 3 and the indium ring sealing flange bottom disc 32, and is used for fixedly installing the low-temperature superconducting magnet 3. A liquid level meter is arranged on the magnet fixing disc 31. Figure 4 and Figure 5 As shown, the bottom of the magnet fixing disc 31 is provided with a plurality of cooling channels 311. In this embodiment, the cooling channels 311 are four, which are arranged radially at the bottom of the magnet fixing disc 31, increase the space for containing liquid helium below the low-temperature superconducting magnet 3, and have better cooling effect on the low-temperature superconducting magnet 3. When installing the low-temperature superconducting magnet 3, first place the low-temperature superconducting magnet 3 on the magnet fixing disc 31, fix the low-temperature superconducting magnet 3 and the magnet fixing disc 31 with bolts, then place the magnet fixing disc 31 together with the low-temperature superconducting magnet 3 on the indium ring sealing flange bottom disc 32, push the indium ring sealing flange bottom disc 32 to move the low-temperature superconducting magnet 3, until the sealing surface of the indium ring sealing flange bottom disc 32 abuts against the liquid helium storage tank 11, the low-temperature superconducting magnet 3 is just installed in the liquid helium storage tank 11, and then the indium ring sealing flange bottom disc 32 is fixed with the liquid helium storage tank 11 by bolts, and the magnet pushing opening 15 is closed by a plurality of bottom plates 16.

[0049] As shown, Figure 6 The plug 6 is arranged at the bottom end of the electric lead rod 2, and the plug 6 is a stepped circular table. The plug 6 is provided with a surplus wire winding column 61 at the bottom, and the surplus wire winding column 61 is located between the two brass tubes.

[0050] As shown, Figure 7 , Figure 8 and Figure 10As shown in the figure, the socket 7 is arranged at the edge of the top of the low-temperature superconducting magnet 3 and is movably connected with the low-temperature superconducting magnet 3. Specifically, the top end of the socket 7 is provided with a hole for inserting the plug 6, the bottom of the socket 7 is provided with two lead rod locating holes 71 for inserting two brass tubes and a spare wire winding column locating hole 72 for inserting the spare wire winding column 61. When the plug 6 is connected with the socket 7 and not completely connected, the plug 6 can rotate in the socket 7, and the excess lead can be wound on the spare wire winding column 61 by rotating the lead rod 2, the connection of the lead rod 2 with the superconducting terminal of the low-temperature superconducting magnet 3 from top to bottom realizes a relatively perfect butt joint. A plurality of small wire passing holes 8 are arranged on the plug 6 and the socket 7 for passing the related data signal lines of the equipment.

[0051] As shown in the figure, Figure 7 A support frame 73 is arranged between the socket 7 and the low-temperature superconducting magnet 3, the support frame 73 comprises a support block 731 fixedly installed on the low-temperature superconducting magnet 3, the support block 731 is fixedly connected with an adapter column 732, the adapter column 732 is fixedly connected with a door-shaped first support frame 733, the first support frame 733 is rotatably connected with a door-shaped second support frame 734 in the first support frame 733, the second support frame 734 can rotate along a horizontal axis, the end of the second support frame 734 is rotatably connected with the socket 7 through a rotating shaft 7341, and the rotating shaft of the rotating shaft is arranged horizontally, so that the inclination angle of the socket 7 can be changed.

[0052] The implementation principle of the low-temperature superconducting magnet lead device in the embodiment of the application is as shown in the figure, Figure 1 The lead rod 2 is inserted into the inclined angle conduit 4 from the upper side of the Dewar flask 1, after passing through the top plate 12 and the inclined angle conduit 4, the lead rod 2 enters the liquid helium storage tank 11 and waits to be connected with the low-temperature superconducting magnet 3. When the low-temperature superconducting magnet 3 is installed, the low-temperature superconducting magnet 3 is first fixed on the magnet fixing disc 31, and then the magnet fixing disc 31 is fixed on the indium ring sealing flange bottom disc 32 together with the low-temperature superconducting magnet 3. Figure 9As shown, push the indium ring sealing flange bottom plate 32 to move the low temperature superconducting magnet 3, the low temperature superconducting magnet 3 is inserted into the magnet push-in port 15 from the lower side eccentric position of the Dewar 1, because the low temperature superconducting magnet 3 is located at the eccentric position of the Dewar 1, through the operation gap 17, the connection of the superconducting lead of the low temperature superconducting magnet 3 and the lead rod 2 is good, and the lower end of the lead rod 2 is supported on the support frame 73 on the low temperature superconducting magnet 3, continue to push the low temperature superconducting magnet 3, the low temperature superconducting magnet 3 will continue to move upward, so that the low temperature superconducting magnet 3 tends to the center of the Dewar 1, and the lead rod 2 also moves upward in the inclined angle guide pipe 4, until it is in place at the lower sealing surface of the indium ring sealing flange bottom plate 32, at this time, rotate the lead rod 2, so that the excess lead wire is wound on the excess wire take-up post 61, through the small operation gap 17 which has not been sealed, observe the winding of the lead wire, until it is wound well, and there is no serious pulling phenomenon. As shown in the figure, Figure 11As shown, the sealing surface of the indium ring sealing flange bottom disc 32 abuts against the liquid helium storage tank 11, the low-temperature superconducting magnet 3 is just fitted into the liquid helium storage tank 11, and the relevant bolts are tightened to complete the fixation. At the same time, the upper end copper terminal post 22 of the electric lead rod 2 penetrates through the electrically insulating sleeve 24, and then the connecting bolt of the electrically insulating sleeve 24 and the electric lead rod insertion port 121 is tightened, and the power supply connecting clip 23 is inserted, and the installation work of the electric lead rod 2 and the low-temperature superconducting magnet 3 is completed. The lower end of the electric lead rod 2 is always immersed in liquid helium, and the stable connection of the superconducting lead wire of the low-temperature superconducting magnet 3 can ensure that the large current (usually the magnet working current is between 75 amperes and 120 amperes) from the indoor magnet power supply can normally power the low-temperature superconducting magnet 3, without additional heat generation, small vibration and interference of the lead wire and the electric lead rod 2, avoiding the occurrence of the magnet quenching phenomenon, avoiding the release of a large amount of liquid helium vapor, and avoiding the loss of high liquid helium. In actual operation and use, many other devices need to be installed at the neck pipe 113 of the Dewar flask 1 for use, and some samples are also placed in the magnetic field center of the low-temperature superconducting magnet 3. Compared with the prior art of vertically inserting the electric lead rod 2 from the narrow neck pipe 113 of the Dewar flask 1, the present scheme inserts the electric lead rod 2 obliquely, avoids the interference of the top of the electric lead rod 2 with other devices at the center of the top plate 12 of the Dewar flask 1, and well solves the contradiction between the large-size low-temperature superconducting magnet 3 bottom installation and the small diameter of the Dewar flask 1 neck pipe 113. When the low-temperature superconducting magnet 3 has multiple direction magnetic fields, multiple oblique angle pipes 4 can be arranged, so that multiple electric lead rods 2 can be obliquely inserted into the liquid helium storage tank 11 and connected with the low-temperature superconducting magnet 3 from different angles and directions, and multiple electric lead rods 2 can be arranged to work simultaneously to provide power, which can accurately realize installation in place, is convenient to operate, saves time and effort. The present scheme can be used in various 3He systems with superconducting magnets and wet type refrigeration equipment such as dilution refrigerators, the working state of the magnet is good, the current supply is stable, the heat loss caused is small, there is no quenching, the helium saving effect is obvious, and the economic benefit is considerable.

[0053] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. Those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the protection scope of the present application. It is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A low-temperature superconducting magnet electric lead device comprising a dewar (1), an electric lead rod (2), and a low-temperature superconducting magnet (3), the dewar (1) being provided with a liquid helium storage tank (11) and a top plate (12), characterized in that, Also include: Oblique angle conduit (4), the oblique angle conduit (4) is inclined, the oblique angle conduit (4) from the top plate (12) penetrates into the liquid helium storage tank (11), for guiding the electric pole (2) oblique insertion into the dewar (1); Magnet push inlet (15), the magnet push inlet (15) is arranged at the bottom end of the dewar (1) and is communicated with the liquid helium storage tank (11), the magnet push inlet (15) is used for moving the low temperature superconducting magnet (3) into the liquid helium storage tank (11), and an operation gap (17) is arranged between the magnet push inlet (15) and the low temperature superconducting magnet (3) before the low temperature superconducting magnet (3) is completely pushed into the dewar (1) by the magnet push inlet (15); Plug (6), the plug (6) is arranged at the bottom end of the electric pole (2); Socket (7) for connecting with the plug (6), the socket (7) is movably connected with the low temperature superconducting magnet (3).

2. The cryogenic superconducting magnet leadthrough of claim 1, wherein, The electric pole (2) is provided with a heat radiation baffle (5) for blocking the downward radiation of the radiation above.

3. The cryogenic superconducting magnet leadthrough of claim 2, wherein, The surface of the heat radiation baffle (5) is attached with an aluminum foil (52).

4. The cryogenic superconducting magnet leadthrough of claim 2, wherein, The electric pole (2) includes two brass tubes parallel to the oblique angle conduit (4), and the heat radiation baffles (5) are arranged axially along the electric pole (2).

5. The cryogenic superconducting magnet leadthrough of claim 4, wherein, The heat radiation baffle (5) is provided with a ventilation hole (51), and the ventilation holes (51) on adjacent heat radiation baffles (5) are staggered.

6. The cryogenic superconducting magnet leadthrough of claim 1, wherein, The socket (7) is provided with a hole at the top end for inserting the plug (6), and the socket (7) can rotate in the plug (6).

7. The cryogenic superconducting magnet leadthrough of claim 1, wherein, The socket (7) and the low temperature superconducting magnet (3) are provided with a support frame (73), one end of the support frame (73) is fixedly connected with the low temperature superconducting magnet (3), the other end is rotatably connected with the socket (7), and the rotation axis is horizontally arranged, so as to change the inclination angle of the socket (7).

8. The cryogenic superconducting magnet leadthrough of claim 6, wherein, The bottom of the plug (6) is provided with a surplus line take-up column (61).

9. The cryogenic superconducting magnet leadthrough of claim 1, wherein, The bottom of the low temperature superconducting magnet (3) is sequentially provided with a magnet fixing disc (31) and an indium ring sealing flange bottom disc (32).

10. The cryogenic superconducting magnet leadthrough of claim 9, wherein, The bottom of the magnet fixing disc (31) is provided with a plurality of cooling channels (311).

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