Abstract: Apparatus is disclosed for serving as both a reversing valve and an expansion device in a refrigeration circuit. A valve gate having passageways to direct refrigerant between the indoor and the outdoor heat exchangers to effect the function of a reversing valve is disclosed. In addition, the valve gate has multiple flow restriction devices which are selectively incorporated within a refrigeration circuit between the indoor heat exchanger and the outdoor heat exchanger to effect the appropriate amount of flow restriction dependent upon the mode of operation of the unit. These two functions may be incorporated into a single valve or they may be separated such that the separate functions are performed by separate valves. A cylindrical valve gate and multiple passageways for connecting the appropriate lines in a refrigeration circuit are described. The valve is rotated by a combination of an electromagnet spaced about the valve gate and a permanent magnet located within the valve gate.

Abstract: About 1 to about 25% by weight of a liquid refrigerant is mixed into a refrigerant gas to be introduced into a screw compressor by suction on the basis of the refrigerant gas in a refrigerator comprising a screw compressor, a condenser, and an expansion valve and an evaporator connected to one another in series. A cooling effect as well as a sealing effect can be satisfactorily attained thereby.

Abstract: A fluid flow passage is available, between an inlet tube and an outlet tube, through a piston supported by a spring and equipped with an orifice connecting a pilot chamber and the outlet tube. A bellows chamber or a diaphragm chamber is provided with a pilot valve, which is directly connected with the bellows or the diaphragm, to open or close an orifice connecting the bellows chamber or the diaphragm chamber and a pilot chamber in which the piston is placed, in response to the pressure in the inlet tube monitored by the bellows or the diaphragm. The inlet tube and the outlet tube, together with the valve body, are formed by pressing or drawing at either end of a single tube which contains the valve means under the perfect airtight condition, to form a control valve to be employed for refrigerator and air conditioner.

Abstract: A sorption heat pump including a fuel energized discharge unit from which heated fluid media for the heat pump is provided and a circuit having the fluid media circulated therethrough and arranged to include a heat exchanger, an absorber, pump devices, a temperature level changer and an energy consumption circuit. The discharge unit operates to emit the fluid media into the circuit as a heated weak solution and to receive the fluid media returned from the circuit as a rich solution. The discharge unit also produces an overheated vapor. The temperature level changer comprises a first and a second heat exchange unit, with the first unit being directly connected to the discharge unit to receive the weak solution therefrom, with the first unit also being connected to form part of a supply line for the energy consumption circuit.

Abstract: Cryogenic cooling apparatus of the type including a generally tubular heat exchanger having a warm end and a cold end and affording two paths through one of which refrigerant gas flows from a supply under pressure to an expansion nozzle for producing cooling by means of the Joule Thomson effect in a liquefying chamber whence the low pressure gas returns through the other path to cool the incoming refrigerant, and a valve member cooperating with the nozzle to vary its effective area for automatically controlling the flow of refrigerant is characterized in that the valve is actuated by the expansion of an expander caused by the temperature of the expander itself, the expander being of elongate form and having an anchored end supported by the cold end of the heat exchanger but thermally insulated from it by a path of low thermal conductivity and extending away from the warm end of the heat exchanger to a free end which actuates the valve the expander having a warm end portion of high thermal conductivity extendi

Abstract: A demand-flow cryostat wherein a refrigerant is supplied through an elongated heat exchanger disposed in a container and the refrigerant is expanded through a Joule-Thompson expansion orifice at one end of the heat exchanger to provide an inventory of liquid in the container at that end and wherein a valve member for controlling a refrigerant flow through the orifice is located adjacent thereto and is movable relative to the orifice; whereby a throttling movement is effected with a reduction in temperature. The operation of the orifice and valve member characterized in that each is affixed to separate mounting means, each of which mounting means is associated with a separate control element composed of different materials whose mean cryogenic linear coefficients of expansion differ by at least about 1.times.10.sup.-5 (.degree. K.sup.-1).

Abstract: An expendable refrigeration system is disclosed for use with an insulated storage compartment. The system utilizes a concept of the liquid coolant storage reservoir being kept at a cold temperature and withdrawing heat from a storage compartment. The pressurized uninsulated liquid carbon dioxide storage reservoir is within the storage compartment and has a vent from a gaseous space in the liquid storage reservoir. A pressure relief valve is installed in the vent adapted to maintain a substantially constant pressure within the liquid storage reservoir, such that the temperature of the liquid carbon dioxide within the storage reservoir is controlled and is below the desired temperature within the insulated storage compartment.

Abstract: An adjustable Joule-Thomson cryogenic cooler with a downstream thermal compensation mechanism is taught. The cryogenic cooler includes a cryogen source coupled to a manifold input port, the manifold input port connected to a heat exchanger, the heat exchanger coupled to an orifice block, and the orifice block connected to an expansion chamber. A thin cylindrical tube is attached to the manifold to support the heat exchanger. The expansion chamber is defined by the orifice block, the exterior surface of the cylindrical tube, a portion of the interior of the cylindrical tube in communication with the exterior surface of the cylindrical tube through passages, a dewar stem, and a portion of the manifold. The dewar stem encloses the cylindrical tube and sealingly engages the manifold. The thermal compensation mechanism includes a bimetal cantilever in the expansion chamber portion of the cylindrical tube, an adjustment mechanism for adjusting the effective bimetal cantilever, and a needle valve mechanism.

Abstract: A multiple stage expansion valve for use in an air conditioning system for an automotive vehicle including multiple stage flow control orifices located between a refrigerant condenser and a refrigerant evaporator, the high pressure side of the refrigerant gas compressor being in fluid communication with the inlet side of the condenser, the low pressure side of the compressor being connected to the outlet side of the evaporator through a suction throttling valve device, said expansion device comprising multiple stage orifice valves defined in part by a movable piston that responds to the pressure differential across the expansion device to establish optimum refrigerant flow through the air conditioning system during operation at high load, for establishing a relatively high fluid flow restriction during operation at low and moderate loads, and for establishing a moderate fluid flow restriction during operation at high loads and low compressor speeds.

Abstract: An automatic expansion valve for controlling refrigerant flow from a condenser to an evaporator in which the valve includes an apertured deflectable disc which defines the refrigerant expanson orifice with other structure within the valve, and with the flow passage arrangement in the valve body being such as to subject the upstream face of the disc to the pressure of the liquid refrigerant, and the downstream face of the disc to the pressure of the expanded vaporous refrigerant so that the disc deflects in accordance with the differential pressure on the opposite faces and accordingly effects changes in the effective opening of the expansion orifice.

Abstract: An automatic expansion valve for controlling refrigerant flow from a condenser to an evaporator in which the valve includes a deflectable member which defines a refrigerant expansion orifice with other structure within the valve, and with the flow passage arrangement in the valve body being such as to subject at least part of the opposite faces of the deflectable member to the different pressures resulting from refrigerant flow through the expansion orifice so that changes in the deflection of the deflectable member are in accordance with differential pressure across the orifice and accordingly effects changes in the effective opening of the expansion orifice.