A plug-in infusion tube for cooling low-temperature system

Abstract

The present invention discloses a plug-in infusion tube for cooling a low-temperature system, which includes an infusion tube, a sealing joint, a drainage tube and a liquid dispensing tube. The sealing joint, the drainage tube and the liquid dispensing tube are all arranged inside a low-temperature superconducting magnet cooling device. A through hole is provided in the sealing joint. The infusion tube is inserted into one end of the through hole of the sealing joint through the inlet. The other end of the through hole of the sealing joint matches the drainage tube. The drainage tube and the liquid dispensing tube are welded. The liquid dispensing tube penetrates into the bottom of the low-temperature thermostat, and a hole is provided on the liquid dispensing tube. The problems of the existing infusion tube set being difficult to plug in and out and the sealing being not tight are solved, and the heat loss caused by the excessively long infusion pipeline inside the low-temperature thermostat is also solved. In addition, the low-temperature medium in the low-temperature thermostat can be completely removed.

Description

Technical Field

[0001] The invention belongs to the field of low-temperature system cooling devices, and in particular relates to a plug-in infusion tube for cooling a low-temperature system. Background Art

[0002] As an emerging technology in the 21st century, superconducting technology has been widely used in many fields such as national economy, scientific experiments, national defense and military industry, and its industrial scale is also getting bigger and bigger.

[0003] Superconductivity refers to the property of certain substances that their resistance to temperature drop is zero under certain temperature conditions, so superconducting coils operate at extremely low temperatures. As the core component of superconducting magnets, superconducting coils have always attracted much attention, and their safety and stability are also the focus of research. At present, the low-temperature environment required for low-temperature superconducting magnets is mainly provided by liquid helium and refrigerators. The liquid helium is installed in a cryostat and the coils are immersed in liquid helium. To reduce the temperature of a superconducting magnet from room temperature to liquid helium, liquid nitrogen is generally used to reduce the temperature of the coil to 77K, and then the liquid nitrogen is discharged from the cryostat. After that, liquid helium is injected into the cryostat, and the temperature of the thermostat and the coil is finally reduced to 4.2K, which is the operating temperature of the superconducting coil.

[0004] At present, the infusion tube used to input the cryogenic medium into the dewar is usually composed of two sections of steel pipes, one section is fixed inside the dewar, and the other section can be freely plugged in and out. The two sections of the infusion tube are connected by a stainless steel cylindrical surface; however, this connection method is affected by the processing accuracy and shrinkage in a low-temperature environment, and is not easy to plug in and out, and is difficult to seal. During the infusion process, it will leak at the junction of the two tubes, and the cryogenic medium will immediately vaporize and be discharged, and the cooling effect of the magnet is very poor. After the pre-cooling is completed and during maintenance, the cryogenic medium in the superconducting magnet thermostat is often removed by heating and vaporization, which takes a long time, and the removed cryogenic medium cannot be directly used after vaporization.

[0005] The present invention uses a polytetrafluoroethylene joint seat and a drainage pipe structure to achieve smooth entry of a cryogenic medium into a superconducting magnet thermostat to cool a superconducting magnet, and can also achieve return of the cryogenic medium inside the superconducting magnet cryogenic thermostat to the outside of the cryogenic thermostat in a liquid form. Summary of the invention

[0006] The purpose of the present invention is to provide a pluggable infusion tube for cooling a low-temperature system, so as to solve the problems of the existing infusion tube group being difficult to plug and unplug and having poor sealing, and also solve the heat loss caused by the excessively long infusion pipeline inside the low-temperature thermostat; in addition, the low-temperature medium in the low-temperature thermostat can be completely removed.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A plug-in infusion tube for cooling a low-temperature system, wherein a low-temperature superconducting magnet cooling device is provided in the low-temperature system, and the low-temperature superconducting magnet cooling device comprises a low-temperature thermostat, a superconducting coil and a cold box, wherein the low-temperature thermostat is connected to the cold box, the superconducting coil is arranged inside the low-temperature thermostat, and an air outlet and an inlet are arranged on the upper end surface of the cold box;

[0009] The plug-in infusion tube comprises an infusion tube, a sealing joint, a drainage tube and a liquid dispensing tube. The sealing joint, the drainage tube and the liquid dispensing tube are all arranged inside a low-temperature superconducting magnet cooling device. A through hole is opened in the sealing joint. The infusion tube is inserted into one end of the through hole of the sealing joint through an inlet. The other end of the through hole of the sealing joint cooperates with the drainage tube. The drainage tube and the liquid dispensing tube are welded. The liquid dispensing tube penetrates into the bottom of the low-temperature thermostat and a hole is opened on the liquid dispensing tube.

[0010] Furthermore, the infusion tube matches the inlet.

[0011] Furthermore, the sealing joint is arranged in a cold box.

[0012] Furthermore, a tapered hole is formed on the upper end surface of the sealing joint, and a flat hole is formed on the other end of the sealing joint.

[0013] Furthermore, the drainage pipe is a double-layer insulation pipe, and the drainage pipe runs through the cold box and the low-temperature thermostat.

[0014] Furthermore, the inner diameter of the through hole of the sealing joint is equal to the outer diameter of the infusion tube and the outer diameter of the drainage tube.

[0015] Furthermore, the sealing joint is made of polytetrafluoroethylene; the infusion tube, drainage tube and liquid distribution tube are made of stainless steel.

[0016] Furthermore, under low temperature conditions during the infusion process, the linear thermal shrinkage rate of the sealing joint made of polytetrafluoroethylene is greater than the linear thermal shrinkage rate of the infusion tube and drainage tube made of stainless steel. The two ports of the sealing joint tighten the infusion tube and drainage tube, and the sealing joint forms a sealing structure with the infusion tube and drainage tube respectively.

[0017] Beneficial effects of the present invention:

[0018] The present invention provides a plug-in infusion tube for cooling a low-temperature system. The plug-in infusion tube comprises an infusion tube, a sealing joint, a drainage tube and a liquid distribution tube. The sealing joint is made of polytetrafluoroethylene. The sealing joint made of polytetrafluoroethylene has lubricating properties, which is conducive to inserting and removing the infusion tube from the sealing joint. The infusion tube and the drainage tube are made of stainless steel. Under low-temperature conditions during the infusion process, since the linear thermal shrinkage rate of the sealing joint made of polytetrafluoroethylene is greater than the linear thermal shrinkage rate of the infusion tube and the drainage tube made of stainless steel, the two ends of the sealing joint hold the infusion tube and the drainage tube tighter and tighter, forming an effective sealing structure, effectively preventing the low-temperature fluid from leaking out of the interface.

[0019] In addition, since the drainage tube is a double-layer insulation tube, the vaporized high-temperature gas will not exchange heat with the low-temperature medium flowing through the drainage tube and the infusion tube during the process of being discharged from the outlet along the low-temperature thermostat and the cold box, thereby reducing heat loss and reducing the amount of cooling medium. The cooling effect of the superconducting magnet is more obvious, and the low-temperature medium inside the superconducting magnet low-temperature thermostat is returned to the outside of the low-temperature thermostat in liquid form, so that the low-temperature medium can be recycled and reused, saving resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the structure of the plug-in infusion tube of the present invention;

[0022] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0023] 1-infusion tube, 2-sealed joint, 3-drainage tube, 4-liquid dispensing tube, 5-low-temperature thermostat, 6-superconducting coil, 7-cold box, 8-gas outlet, 9-inlet, 10-conical hole, 11-flat hole. DETAILED DESCRIPTION

[0024] 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.

[0025] See also Figure 1As shown, a plug-in infusion tube for cooling a low-temperature system, wherein a low-temperature superconducting magnet cooling device is provided in the low-temperature system, and the low-temperature superconducting magnet cooling device comprises a low-temperature thermostat 5, a superconducting coil 6 and a cold box 7, wherein the low-temperature thermostat 5 is connected to the cold box 7, the superconducting coil 6 is arranged inside the low-temperature thermostat 5, and an air outlet 8 and an inlet 9 are provided on the upper end surface of the cold box 7;

[0026] The plug-in infusion tube comprises an infusion tube 1, a sealing joint 2, a drainage tube 3 and a liquid dispensing tube 4. The sealing joint 2, the drainage tube 3 and the liquid dispensing tube 4 are all arranged inside a low-temperature superconducting magnet cooling device. The sealing joint 2 is arranged in a cold box 7. A through hole is opened in the sealing joint 2. A tapered hole 10 is opened on the upper end surface of the sealing joint 2. The tapered hole 10 is used to guide the infusion tube 1 to be inserted into the sealing joint 2 after passing through an inlet 9. A flat hole 11 is opened at the other end of the sealing joint 2. The drainage tube 3 is inserted into the flat hole 11 and connected with the sealing joint 2. The drainage tube 3 and the liquid dispensing tube 4 are welded. The drainage tube 3 is a double-layer insulation tube. The liquid dispensing tube 4 penetrates into the bottom of the low-temperature thermostat 5. The liquid dispensing tube 4 is opened with a hole.

[0027] The sealing joint 2 is made of polytetrafluoroethylene. The sealing joint 2 made of polytetrafluoroethylene has lubricating properties, which is conducive to the insertion and removal of the infusion tube 1 from the sealing joint 2. The infusion tube 1, the drainage tube 3 and the distribution tube 4 are made of stainless steel. Under normal temperature conditions, the inner diameter of the through hole of the sealing joint 2 is equal to the outer diameter of the infusion tube 1 and the outer diameter of the drainage tube 3 respectively. Under low temperature conditions during the infusion process, since the linear thermal shrinkage rate of the sealing joint 2 made of polytetrafluoroethylene is greater than the linear thermal shrinkage rate of the infusion tube 1 and the drainage tube 3 made of stainless steel, the two ports of the sealing joint 2 hold the infusion tube 1 and the drainage tube 3 tighter and tighter, forming a sealing structure, effectively preventing the low-temperature fluid from leaking from the interface.

[0028] The method for cooling the superconducting coil 6 is specifically as follows:

[0029] The infusion tube 1 is conveniently inserted into the sealing joint 2 through the inlet 9, and the cryogenic medium is input. The cryogenic medium fluid flows through the infusion tube 1, the sealing joint 2, the drainage tube 3 and the liquid dispensing tube 4 in sequence, and finally the cryogenic medium fluid is sprayed onto the superconducting coil 6 through the hole on the liquid dispensing tube 4 and then vaporized. The vaporized high-temperature gas then flows to the cold box 7 through the low-temperature thermostat 5. The vaporized high-temperature gas is slightly cooled in the cold box 7 and then sprayed out from the gas outlet 8. After the temperature of the superconducting coil 6 drops slightly, the cryogenic medium is stored in the low-temperature thermostat 5 and the cold box 7 in liquid form, thereby achieving superconducting. The purpose of cooling the conductive coil 6 is that the drainage tube 3 is a double-layer insulation tube, so that the vaporized high-temperature gas will not exchange heat with the low-temperature medium flowing through the drainage tube 3 and the infusion tube 1 during the process of being discharged from the gas outlet 8 along the low-temperature thermostat 5 and the cold box 7, thereby reducing heat loss and reducing the amount of cooling medium. After the superconducting coil 6 is cooled, gas is rushed into from the gas outlet 8 to increase the internal pressure of the low-temperature superconducting magnet cooling device, so that the low-temperature medium liquid is recovered along the plug-in infusion tube. After the low-temperature medium liquid is recovered, the infusion tube 1 is pulled out.

[0030] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A plug-in infusion tube for cooling a low-temperature system, characterized in that: The cryogenic system is provided with a low-temperature superconducting magnet cooling device, which comprises a low-temperature thermostat (5), a superconducting coil (6) and a cold box (7). The low-temperature thermostat (5) is connected to the cold box (7), the superconducting coil (6) is arranged inside the low-temperature thermostat (5), and the upper end surface of the cold box (7) is provided with an air outlet (8) and an inlet (9); The plug-in infusion tube comprises an infusion tube (1), a sealing joint (2), a drainage tube (3) and a liquid dispensing tube (4); the sealing joint (2), the drainage tube (3) and the liquid dispensing tube (4) are all arranged inside a low-temperature superconducting magnet cooling device; a through hole is provided in the sealing joint (2); the infusion tube (1) is inserted into one end of the through hole of the sealing joint (2) through an inlet (9); the other end of the through hole of the sealing joint (2) is matched with the drainage tube (3); the drainage tube (3) and the liquid dispensing tube (4) are welded; the liquid dispensing tube (4) penetrates into the bottom of a low-temperature thermostat (5); and a hole is provided on the liquid dispensing tube (4); The sealing joint (2) is made of polytetrafluoroethylene; the infusion tube (1), drainage tube (3) and liquid distribution tube (4) are made of stainless steel; The inner diameter of the through hole of the sealing joint (2) is respectively equal to the outer diameter of the infusion tube (1) and the outer diameter of the drainage tube (3); Under low temperature conditions during the infusion process, the linear heat shrinkage rate of the sealing joint (2) made of polytetrafluoroethylene is greater than the linear heat shrinkage rate of the infusion tube (1) and the drainage tube (3) made of stainless steel. The two ends of the sealing joint (2) tighten the infusion tube (1) and the drainage tube (3), and the sealing joint (2) forms a sealing structure with the infusion tube (1) and the drainage tube (3) respectively.

2. The plug-in infusion tube for cooling a low-temperature system according to claim 1, characterized in that: The sealing joint (2) is arranged in a cold box (7).

3. The plug-in infusion tube for cooling a low-temperature system according to claim 1, characterized in that: The upper end surface of the sealing joint (2) is provided with a tapered hole (10), and the other end of the sealing joint (2) is provided with a flat hole (11).

4. The plug-in infusion tube for cooling a low-temperature system according to claim 1, characterized in that: The drainage pipe (3) is a double-layer insulation pipe, and the drainage pipe (3) runs through the cold box (7) and the low-temperature thermostat (5).

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