Abstract: An expansion valve for a refrigerating cycle, in which the body dimensions and the weight of the whole valve can be reduced and a reduction in cost can be achieved.

Abstract: A plurality of evaporators 5, 11 for evaporating an refrigerant at low pressure, which has passed through pressure reducing means 4, 10, are provided, an accumulator 9 is provided on the outlet side of one evaporator 5, an internal heat exchanger 3 is provided on the outlet side of the accumulator 9, the outlet side of another evaporator 11 is joined to a portion between the outlet side of the accumulator 9 and the inlet side of the internal heat exchanger 3, and the pressure reducing means 10 at the evaporator 11 side is composed of a fixed throttle.

Abstract: A supercritical heat pump cycle system includes a low-pressure determining unit for determining a pressure of a low-pressure refrigerant after being decompressed in a decompression unit, a target temperature setting unit for setting a target temperature of the fluid, and a target pressure determining unit for determining a heating target control pressure in a refrigerant radiator based on the pressure of the low-pressure refrigerant and the target temperature of the fluid during the heating operation. In the supercritical heat pump cycle system, the decompression unit is controlled so that a refrigerant pressure in the refrigerant radiator becomes the heating target control pressure. Accordingly, heating capacity of the refrigerant radiator can be effectively increased.

Abstract: A pressure control valve includes a valve portion disposed in a passage from a refrigerant radiator to a suction port of a refrigerant compressor in a vapor-compression refrigerant cycle system. The valve portion controls a refrigerant pressure at an outlet of the refrigerant radiator in accordance with a refrigerant temperature at the outlet of the refrigerant radiator, and the valve portion has a control pressure characteristic in which a pressure change relative to a temperature is smaller than that of the refrigerant. Furthermore, the valve portion may have a fluid passage through which refrigerant flows even when a valve port of the valve portion is closed by a valve body. Accordingly, when the refrigerant radiator is used for heating a fluid, heating capacity for heating the fluid can be rapidly increased at a heating start time.

Abstract: In a vapor-compression refrigerant cycle system, a switching device is provided to switch one of a first mode where high-pressure refrigerant discharged from a compressor is directly introduced to an exterior heat exchanger and a second mode where the high-pressure refrigerant is directly introduced to an interior heat exchanger. When the second mode is set, the pressure of the high-pressure refrigerant is set higher than a predetermined pressure by a constant-pressure control valve. Accordingly, it can prevent heating capacity of the interior heat exchanger from being greatly changed even when thermal load of the vapor-compression refrigerant cycle system is changed, and heating capacity of the interior heat exchanger can be improved in the second mode.

Abstract: In a hot gas heating mode of an ejector cycle system, hot gas refrigerant discharged from a compressor is introduced to an interior heat exchanger while bypassing an exterior heat exchanger. The refrigerant discharged from the interior heat exchanger can flow into an ejector from at least an inlet of a nozzle of the ejector, and flows into the gas-liquid separator, in the heating mode. Alternatively, refrigerant discharged from the compressor can be supplied to the interior heat exchanger through a clearance between an outer wall of the nozzle and an inner wall of a nozzle housing portion, while bypassing the exterior heat exchanger in the heating mode. Here, the nozzle is disposed in the nozzle housing portion, and a part of pressurizing portion is defined by the nozzle housing portion. Thus, the heating mode can be readily performed in the ejector cycle system.

Abstract: A vapor-compression refrigerant cycle system includes a first evaporator in which refrigerant is evaporated, a second evaporator in which refrigerant is evaporated at a pressure lower than that in the first evaporator, and a switching device for switching between a first circulation where the refrigerant is circulated to the first evaporator and a second circulation where the refrigerant is circulated to the second evaporator. When the switching device switches to the second circulation from the first circulation, a refrigerant circulation into the second evaporator is stopped until the refrigerant pressure in the second evaporator becomes equal to or lower than a predetermined pressure. Therefore, the pressure in the second evaporator can be rapidly reduced. Further, when carbon dioxide is used as the refrigerant, the pressure in the second evaporator can be further rapidly reduced.

Abstract: In a vapor-compression refrigerant cycle system, a switching device is provided to switch one of a first mode where high-pressure refrigerant discharged from a compressor is directly introduced to an exterior heat exchanger and a second mode where the high-pressure refrigerant is directly introduced to an interior heat exchanger. When the second mode is set, the pressure of the high-pressure refrigerant is set higher than a predetermined pressure by a constant-pressure control valve. Accordingly, it can prevent heating capacity of the interior heat exchanger from being greatly changed even when thermal load of the vapor-compression refrigerant cycle system is changed, and heating capacity of the interior heat exchanger can be improved in the second mode.

Abstract: In an ejector cycle having an ejector, a throttle is provided inside a passenger compartment adjacent to an evaporator so that a length of a refrigerant passage between the throttle and the evaporator is shortened. Therefore, it can restrict a part of liquid refrigerant after being decompressed in the throttle from being evaporated in the refrigerant passage, before being introduced into the evaporator. In addition, a refrigerant inlet is provided at a lower header tank of an evaporator. Therefore, a gas-liquid refrigerant distribution difference due to the density difference between gas refrigerant and liquid refrigerant can be effectively restricted. Thus, refrigerant distributed into the plural tubes from the lower header tank can be made uniform, even if the refrigerant flow speed is low in the ejector cycle.

Abstract: In a vapor compression refrigerant cycle using refrigerant having a critical temperature equal to or less than sixty degrees Celsius, when refrigerant temperature detected by a sensor as a parameter of a low-pressure side refrigerant pressure is higher than a saturation temperature corresponding to a predetermined pressure that is equal to or less than a critical pressure, a volume of air passing through an evaporator is controlled smaller than a predetermined volume by controlling operation of a blower unit. Because heat exchange rate (heat absorbing rate) in the evaporator is controlled, the pressure of the low-pressure side refrigerant is maintained below the critical pressure. Alternatively, the heat exchange rate is controlled by reducing a flow rate of the refrigerant in the evaporator.

Abstract: A vapor-compression refrigerant cycle system includes a first evaporator in which refrigerant is evaporated, a second evaporator in which refrigerant is evaporated at a pressure lower than that in the first evaporator, and a switching device for switching between a first circulation where the refrigerant is circulated to the first evaporator and a second circulation where the refrigerant is circulated to the second evaporator. When the switching device switches to the second circulation from the first circulation, a refrigerant circulation into the second evaporator is stopped until the refrigerant pressure in the second evaporator becomes equal to or lower than a predetermined pressure. Therefore, the pressure in the second evaporator can be rapidly reduced. Further, when carbon dioxide is used as the refrigerant, the pressure in the second evaporator can be further rapidly reduced.

Abstract: In a hot gas heating mode of an ejector cycle system, hot gas refrigerant discharged from a compressor is introduced to an interior heat exchanger while bypassing an exterior heat exchanger. The refrigerant discharged from the interior heat exchanger can flow into an ejector from at least an inlet of a nozzle of the ejector, and flows into the gas-liquid separator, in the heating mode. Alternatively, refrigerant discharged from the compressor can be supplied to the interior heat exchanger through a clearance between an outer wall of the nozzle and an inner wall of a nozzle housing portion, while bypassing the exterior heat exchanger in the heating mode. Here, the nozzle is disposed in the nozzle housing portion, and a part of pressurizing portion is defined by the nozzle housing portion. Thus, the heating mode can be readily performed in the ejector cycle system.

Abstract: In an ejector cycle having an ejector, a throttle is provided inside a passenger compartment adjacent to an evaporator so that a length of a refrigerant passage between the throttle and the evaporator is shortened. Therefore, it can restrict a part of liquid refrigerant after being decompressed in the throttle from being evaporated in the refrigerant passage, before being introduced into the evaporator. In addition, a refrigerant inlet is provided at a lower header tank of an evaporator. Therefore, a gas-liquid refrigerant distribution difference due to the density difference between gas refrigerant and liquid refrigerant can be effectively restricted. Thus, refrigerant distributed into the plural tubes from the lower header tank can be made uniform, even if the refrigerant flow speed is low in the ejector cycle.

Abstract: In a vapor compression refrigerant cycle using refrigerant having a critical temperature equal to or less than sixty degrees Celsius, when refrigerant temperature detected by a sensor as a parameter of a low-pressure side refrigerant pressure is higher than a saturation temperature corresponding to a predetermined pressure that is equal to or less than a critical pressure, a volume of air passing through an evaporator is controlled smaller than a predetermined volume by controlling operation of a blower unit. Because heat exchange rate (heat absorbing rate) in the evaporator is controlled, the pressure of the low-pressure side refrigerant is maintained below the critical pressure. Alternatively, the heat exchange rate is controlled by reducing a flow rate of the refrigerant in the evaporator.

Abstract: A vehicle air conditioning system mountable on a vehicle has the control function of stopping a vehicle engine automatically when the vehicle stops (eco-run vehicle). The system includes a variable displacement compressor driven by the vehicle engine, and a stop time of the vehicle engine is ensured when the vehicle stops. When the engine is running, the displacement of the variable displacement compressor is adjusted to control the temperature of an evaporator. When the vehicle engine stop request is issued when the vehicle is stopped, the compressor is kept at its maximum displacement and the vehicle engine is either stopped or activated depending on the temperature of the evaporator to control the on and off modes of the compressor.

Abstract: A vehicle air conditioning system mountable on a vehicle has the control function of stopping a vehicle engine automatically when the vehicle stops (eco-run vehicle). The system includes a variable displacement compressor driven by the vehicle engine, and a stop time of the vehicle engine is ensured when the vehicle stops. When the engine is running, the displacement of the variable displacement compressor is adjusted to control the temperature of an evaporator. When the vehicle engine stop request is issued when the vehicle is stopped, the compressor is kept at its maximum displacement and the vehicle engine is either stopped or activated depending on the temperature of the evaporator to control the on and off modes of the compressor.

Abstract: A filter element and a method for manufacturing the filter element is disclosed wherein filter paper is folded in a zigzag manner to form a filter material, and a circumferential portion of the filter material is fastened by an adhesive so as to fasten the zigzag filter material and to divide the filter material into a dust side and a clean side. Thus, the structure of the filter element is simplified and a filter performance is enhanced.

Abstract: A receiver has a good usage for receiving coolant in a refrigerant circuit. The receiver can improve the fixing and the connecting operation when the receiver is connected with the refrigerant circuit provided in an automotive engine room. The receiver is comprised of a receiver housing having a flat upper surface and a couple of block joints having a flat lower surface. The block joints are furnished on the upper surface of the receiver housing by screwing. The block joints have connecting halls an inlet and an outlet pipes are jointed therein. At least one of the connecting halls are formed vertically so that at least one of the inlet and the outlet pipes elongates upwardly. Therefore, the inlet or the outlet pipe has advantage to be connected easily and effectively.

Abstract: An oil heater having a wick fed radiant burner which comprises a wick adjusting shaft rotatable in first and second directions about the longitudinal axis thereof; a wick holder for moving together therewith a wick between an extinguishing position and a maximum combustion position past a minimum combustion position in response to the rotation of the shaft; a ratchet wheel mounted on the shaft for displacement axially of the shaft; an actuating pin mounted on the shaft and angularly movable together with the shaft; an abutment bank provided on the wheel for defining the angular distance over which the pin moves, which angular distance corresponds to the distance of movement of the wick holder between the maximum combustion position and the extinguishing position; and a one-way stopper provided on the wheel and operable to permit the pin to pass thereover during the rotation of the shaft in the second direction, but to restrain the pin from passing thereover during the rotation of the shaft in the first direct

Abstract: A wick-type combustion apparatus for liquid fuels comprises: a pair of cylindrical walls extending vertically and opposed to each other with a gap; a cylindrical wick vertically movable as guided between and along the walls; a slit-form cylindrical fuel passage opening provided in the outer wall and adapted to be opened and closed by the descent and ascent, respectively, of the wick; a fuel trap chamber provided around the opening in communication therewith; and a cylindrical porous member vertically extending in the chamber.A flame or flames remaining after the descent of the wick can be instantaneously blown out by a blast of an explosive combustion which occurs in the fuel trap chamber. The porous member serves to reduce the amount of unburnt fuel used for the explosive combustion, so that an abnormal rise of flame or flames attendant with the explosion can be prevented.