Refrigeration – Using electrical or magnetic effect – Thermoelectric; e.g. – peltier effect
Patent
1986-11-04
1988-03-01
King, Lloyd L.
Refrigeration
Using electrical or magnetic effect
Thermoelectric; e.g., peltier effect
F25B 2102
Patent
active
047277211
ABSTRACT:
An apparatus for magnetocaloric refrigeration, comprising a ferromagnetic terial arranged in a rotor and alternately entering and exiting from a stationary magnetic field when the rotor rotates, and also comprising a circuit for a working gas coming into successive heat exchange contact with a ferromagnetic material arranged outside the magnetic field and thereby cooled, a refrigeration load, a ferromagnetic material located within the magnetic field and thereby heated as well as an external negative heat source. In order to avoid problems with seals in such an apparatus at low temperatures, it is suggested that discrete members consisting of ferromagnetic material be arranged around the rotor circumference so as to be angularly offset, that two members be connected each time to form a pair by a flow path for the working gas, this flow path being arranged within the rotor and leading from an outer surface of the rotor via heat contact with one member of the pair into the center of the rotor and then via heat contact with the other member of the pair to an outer surface of the rotor again, that at least one stationary supply conduit ending in a sealed manner at the outer surface of the rotor and one stationary outlet conduit beginning in a sealed manner at the outer surface of the rotor be provided for the working gas, both conduits communicating with the flow path of one pair in a predetermined angular position of the rotor, that each outlet conduit be associated with a stationary magnetic field such that the member adjacent the outlet conduit is located within this stationary magnetic field and the other member of the pair outside the magnetic field in the predetermined angular position of the rotor, and that a cooling conduit be guided through a hollow bearing shaft of the rotor and have a refrigeration medium flowing through it, this refrigeration medium acting as refrigeration load and coming into heat contact with the working gas in the center of the rotor.
REFERENCES:
patent: 4033734 (1977-07-01), Steyert, Jr. et al.
patent: 4107935 (1978-08-01), Steyert, Jr.
patent: 4332135 (1982-06-01), Barclay et al.
patent: 4459811 (1984-07-01), Barclay et al.
patent: 4509334 (1985-04-01), Nakagome et al.
Peschka Walter
Schneider Gottfried
Deutsche Forschungs -und Versuchsanstalt fur Luft -und Raumfahrt
King Lloyd L.
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