Magnetic refrigerator
US4509334A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 1983 |
| Grant date | Apr 9, 1985 |
| Priority date | — |
| Expiry date | May 23, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/89
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A working material used in a magnetic refrigerator radiates heat when it is magnetized and absorbs heat when it is demagnetized. The working material is cylindrical and extends vertically. A heat pipe has a cylindrical internal space directly surrounding the peripheral surface of the working material and containing helium gas as a heat medium. The peripheral surface of the working material in contact with the internal space functions as a condensing surface of the heat pipe. A superconductive coil surrounds the working material and intermittently applies a magnetic field thereto. A refrigerator unit supplies a cooling space with helium gas at 20.degree. K. or below. The helium gas from the refrigerator unit removes heat produced from the working material when it is adiabatically magnetized by the coil. When the working material is adiabatically demagnetized, it rapidly absorbs heat to cool the helium gas in the internal space of the heat pipe. The helium gas condenses on the peripheral surface of the working material, and falls in drops into the internal space to be stored at the lower end portion thereof. Thus, heat is transferred in one direction or upward in the heat pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.