SU908199A1 - Cryogenic current lead-in - Google Patents

Description

voir and is equipped with a throttle device, under which is placed a reflective screen. At the top of the tank above the throttle device at least one mesh is placed.

Helium under pressure, higher than 2.3 atm, passes through the channels of the magnetic system, heats up and enters the current lead, then the throttle device, made in the form of a nozzle, narrows the channel section and passes pressure to the channel to atmospheric. After throttling, the temperature of the gels drops to 4.2 ° K; most of the gels enter the liquid phase. Liquid helium collects at the bottom of the vessel, evaporates, and cools the current lead with a superconducting cable that is pushed onto the vessel body. To protect the liquid helium from the controlled flow of gas exiting the throttle device, a screen located at the node of the choke is used. A mesh was installed above the throttle device to prevent the gels from passing the droplets together with the reverse flow of the cold gaseous gels. Drops settle on the grids and drain into a collection of liquid gels.

The drawing shows an example of the proposed current lead. A screen 2 is located in the vacuum housing 1, cooled by a flow of liquid nitrogen through tubes 3 attached to thermal contact to screen 2. Inside screen 2 there is 4, into which an additional reservoir 6 is inserted using output pipe 5. Current tube 7 is injected tank 6, while it is hermetically and electrically connected to vessel body 4. Current-carrying tube 7 is tilted to the cooled channel using insulator 8, superconducting cable 9 is attached to the current-carrying tube and to the body of the tank on an electric contact, and to the cooled tube of the magnetic system through the isolating layer. At the outlet into the tank volume, the current-carrying tube 7 is provided with a choke 10. Screen II is located under the choke 10, and a grid 12 above the choke 10. A pair of gels from the vessel 4 is discharged into the pipe 5 through the holes.

The operation of the current ode is as follows.

Helium under pressure, higher than 2.3 atm, passes through the channels of the magnetic system, cools it, heats up to 5-6 ° K, then enters the current-carrying tube 7. The passage through the throttle 10, helium goes into the liquid phase, takes a temperature of 4, 2 ° K, accumulates at the bottom of the vessel

4 and reservoir 6.

Liquid helium washes the superconducting cable 9 and the body of the tank 6 to which the cable 9 is attached. The level of liquid helium can reach the screen 11, which

protects liquid helium from a direct stream of gas that does not peresechuschego in the liquid phase. This note, along with the evaporating helium, is removed through the outlet 5 to the gas tank. Grids 12 serve to trap

drops of liquid gels, captured by a note, and return them to the volume. Drops of gels flow down the inner walls of the tank 6.

Claims (2)

Invention Formula A cryogenic current lead for a high-current system consisting of a body and a cooled screen located inside it, a refrigerant vessel connected to an output pipe and inserted into it by a current-carrying tube attached to the system’s cooled channel through an isolator, and a superconductor characterized in that the purpose of improving the reliability of the current lead, inside the vessel with refrigerant is an additional tank with a pipe in the bottom, and the free the end of the current-carrying tube is inserted into the reservoir and provided with a throttle device, the node with which the reflecting screen is placed, and in the upper part of the reservoir, at least one mesh is placed above the throttle device. Sources of information taken into account in the examination 1- Yu. A. Bunov, Kh. B. Fradkov, N. Yu. Shabolin. Current Inputs for Cryogenic Devices, PTE, Vol. 4, 1974. 2. US patent number 3349164, NCI 174-273, published. 1964 (prototype).