| 摘要 |
<p>PURPOSE:To save energy by a method wherein a gravitational circulation type cooling apparatus is employed as a cooling apparatus for an object to be cooled such as a superconducting coil and a coolant is forcibly make to flow through an exclusive pre-cooling pipe at the time of pre-cooling only. CONSTITUTION:Liquid helium P, contained in a liquid helium container 17, is pumped out from the bottom of the container 17 into a coolant outlet part 21 by gravity. The helium P reaches the lowest end part of the direction of the gravity while being kept at that temperature. The helium P, which reaches a vaporizing part 22, exchanges heat with a superconducting coil 1 through a heat equalizing plate 11 and is vaporized. The vaporized coolant ascends meandering through the vaporizing part 22 and is fed back above the free liquid surface in the container 17. On the other hand, when the coil 1 is pre- cooled from a normal temperature to an intermediate temperature, a compressor is attached to a supply port 52 of a pre-cooling pipe 51 and liquid helium is supplied from the port 52. Then the coil 1 is cooled rapidly. With this constitution, energy can be saved.</p> |
