Abstract: A jet stream injection device for use in a heat exchanger of a fluidized-bed type in which a flat jet stream is injected toward a heat transmission coil of the heat exchanger from below this coil so that is runs along said cell so as to form a mixed-phase flow of a gas and solid particles around the heat transmission coil. The jet stream injection device has a net with meshes smaller than the size of the particles of a fluidized bed provided over an opening provided on the upstream side of a jet stream generating slit-shaped injection port element. The opening has a larger passage sectional area than the injection port element.

Abstract: A refrigerating apparatus for refrigerating an object comprising a cooler and a transfer belt for transferring said object on said cooler, said cooler being contacted with said transfer belt directly or through a slidable layer or powder. Said slidable layer or powder consists of a heat-conducting and slidable substance.

Abstract: A can for use in a canned motor made of a soft magnetic metal plate. Said metal plate has the magnetically hard direction of the texture oriented to the circumferential direction of the can body. Said metal plate also has the magnetically easy direction of the texture oriented to the normal direction of the can body.

Abstract: A refrigerating apparatus comprising a refrigerating cycle into which a screw compressor is incorporated, and a liquid super cooler connected on the way of a liquid pipe of said refrigerating cycle, said screw compressor having a gas intake and/or liquid coolant injection opening which is located at a position where the screw blades of the screw compressor have at least partially compressed the gas in the screw compressor. The position of the gas intake provided in the screw compressor and intended to pass the gas from the liquid super cooler into the screw compressor is limited under such a condition thatV.sub.i = 1.0 .about. 4.5In which ##EQU1## V.sub.L represents the theoretically maximum screw space volume (m.sup.3 /h) in the screw compressor and V.sub.H represents the screw space volume (m.sup.3 /h) at the position of the gas intake.

Abstract: A method of prevention of overheating of an electric motor for a compressor comprising the steps of introducing into the case of the electric motor of the closed type for driving the screw compressor part of the refrigerant which is introduced into an evaporator so as to cause said part of the refrigerant to expand directly therein, and permitting the expanded gas which has absorbed heat to be drawn by suction into a screw blade groove space of the screw compressor in a position in which the screw blades of the screw compressor is meshing engagement with one another have sealed gas.