Abstract: A variable geometry ejector (300) for cooling applications is disclosed comprising a primary fluid chamber (302); a suction chamber (320) downstream the primary fluid chamber (302); a primary nozzle (310) arranged so as to stream a working fluid from the primary fluid chamber (302) to the suction chamber (320); and a tail member (325) arranged downstream the primary nozzle (310), wherein any of the primary nozzle (310) and the tail member (325) is movable in relation to the other. The invention further discloses a system comprising the variable geometry ejector (300). The invention applies to cooling apparatus and systems industry.

Abstract: Systems and methods for implementing ejector refrigeration cycles with cascaded evaporation stages that utilize a pump to optimize operation of the ejector and eliminate the need for a compressor between the evaporation stages.

Abstract: Systems and methods for implementing ejector refrigeration cycles with cascaded evaporation stages that utilize a pump to optimize operation of the ejector and eliminate the need for a compressor between the evaporation stages.

Abstract: An ejector and a refrigeration system. The ejector includes: a high-pressure fluid passage, a flow valve for controlling a flow rate in the high-pressure fluid passage; a suction fluid passage; a mixing chamber, which includes a mixed fluid outlet; a thermal bulb disposed upstream of the flow valve, in the high-pressure fluid passage or outside the high-pressure fluid passage; and an elastic diaphragm disposed in the high-pressure fluid passage, wherein a closed cavity is on a first side of the diaphragm, and the high-pressure fluid passage is on a second side of the diaphragm; the thermal bulb in communication with the closed cavity, and the thermal bulb and the closed cavity are filled with fluid; and the diaphragm is associated with the flow valve so that an opening degree of the flow valve varies in response to a change in a pressure difference across two sides of the diaphragm.

Abstract: An ejector refrigeration system, comprising: a compressor, a heat-extraction heat exchanger, an ejector, a separator, a first throttling element, and a heat-absorption heat exchanger that are connected through pipelines, the ejector having a main flow inlet connected to the heat-extraction heat exchanger, and further having a secondary flow inlet and an ejector outlet; the separator having a separator inlet connected to the ejector outlet, a separator liquid outlet connected to the first throttling element, and a separator gas outlet connected to a gas inlet of the compressor, wherein turn-on and turn-off of a first flow path connecting the heat-absorption heat exchanger and the secondary flow inlet of the ejector and a second flow path connecting the heat-absorption heat exchanger and the gas inlet of the compressor are controllable.

Abstract: An air conditioning heat pump system using an ejector may include a compression assembly, an outdoor heat exchanger, an indoor heat exchanger, an ejector, and a first to third electromagnetic valve and a controller. A first end of the compression assembly may be connected with the one end of the outdoor heat exchanger, a second end may be connected with one end of the indoor heat exchanger, a third end may connected with outlet end of the ejector, and a fourth end may be connected with another end of the outdoor heat exchanger. One end of the outdoor heat exchanger may also be connected with a jet inlet of the ejector through the first electromagnetic valve, and another end may also be connected with the jet inlet of the ejector through the second electromagnetic valve and the third electromagnetic valve.

Abstract: A volatilized substance is condensed using a vapor-liquid interface. The volatilized substance is diffused into a condenser vessel containing a cooling liquid via a diffusion device. When the volatilized substance comes into contact with the cooling liquid it is condensed. The large vapor-liquid surface area created by the diffusion device enhances the rate of condensation. The cooling liquid is circulated through a heat exchanger to remove heat introduced by the condensing vapor. The temperatures of the cooling liquid leaving and entering the condenser vessel are monitored.

Abstract: A thermal regulator system (10) for a fuel cell (12), the system comprising a passive pump member (14) having a first inlet (14a) connected to a first pipe (16), a second inlet (14b) connected to a second pipe (18), and an outlet (14c) configured to be connected to a cooling circuit (20) of the fuel cell (12), the passive pump member (14) being configured to use the Venturi effect to drive a fluid flow along the second pipe (18) by means of a fluid flowing along the first pipe (16). The first pipe (16) and the second pipe (18) are configured to be connected to an outlet of the cooling circuit (20) of the fuel cell (12), the first pipe (16) and the second pipe (18) being configured to feed the passive pump member (14) with fluids at different temperatures.

Abstract: An ejector-type refrigeration cycle has a compressor, an ejector module, a discharge capacity control section, and a pressure difference determining section. The ejector module has a body providing a gas-liquid separating space. The pressure difference determining section determines whether a low pressure difference operating condition is met. The low pressure difference operating condition is an operating condition in which a pressure difference obtained by subtracting a low-pressure side refrigerant pressure from a high-pressure side refrigerant pressure a predetermined reference pressure difference or lower. The body is provided with an oil return passage that guides a part of a liquid-phase refrigerant to flow from the gas-liquid separating space to a suction side of the compressor. The discharge capacity control section sets a refrigerant discharge capacity to be a predetermined reference discharge capacity or higher when the low pressure difference operating condition is determined to be met.

Abstract: An outdoor unit being part of a refrigeration cycle apparatus in which refrigerant circulates and having a maintenance opening port includes an open-close panel configured to cover the maintenance opening port by being attached openably and closably to the outdoor unit, a heat source side heat exchanger disposed above the maintenance opening port and provided at least with an open-close panel-facing heat exchange unit facing a plane containing the open-close panel, a drainage channel located at least below the open-close panel-facing heat exchange unit of the heat source side heat exchanger, wherein the heating energy supply unit includes a refrigerant pipe configured to pass refrigerant higher in temperature than a freezing point of water in an upstream direction from a downstream direction of the drainage channel.

Abstract: An ejector and a refrigeration cycle apparatus having an ejector are provided. The ejector may include an ejector body having an accommodation space therein, a suction portion through which a high pressure refrigerant and a low pressure refrigerant may be suctioned into the accommodation space, and a mixing portion configured to mix the high pressure refrigerant with the low pressure refrigerant; a nozzle provided in the ejector body, having a nozzle neck and an expansion portion, and configured to inject the high pressure refrigerant into the mixing portion; a first needle moveably provided at the expansion portion, and configured to control a flow sectional area of the expansion portion; a second needle moveably provided at the nozzle neck, and configured to control a flow sectional area of the nozzle neck; a first needle drive configured to drive the first needle; and a second needle drive configured to drive the second needle.

Abstract: A power plant having at least one compressor, at least one fuel-burning engine, and a cooler device for cooling admission air for the engine, the engine being provided with a combustion chamber. The cooler device is constituted by a heat engine having three heat sources arranged between two compression stages of the compressor and including a refrigerant fluid and two evaporators. The admission air flows in succession through the two evaporators between the two compression stages firstly to cool the admission air between the two compression stages prior to being injected into the combustion chamber, and secondly to vaporize the refrigerant fluid.

Abstract: A torque estimating device of a compressor for an ejector-type refrigerant cycle device includes a high pressure detector disposed to detect a physical amount having a relation with a high-pressure side refrigerant pressure of a refrigerant cycle, an evaporation pressure detector disposed to detect a physical amount having a relation with a refrigerant evaporation pressure in a suction side evaporator, a pressurizing estimating portion for estimating a pressurizing amount in a pressure increasing portion of an ejector to be increased in accordance with an increase of a pressure difference between the high-pressure side refrigerant pressure and the refrigerant evaporation pressure, and a suction pressure estimating portion for estimating a suction refrigerant pressure of the compressor by using the pressurizing amount estimated by the pressurizing estimating portion. Thus, a drive torque of the compressor can be accurately estimated in the ejector-type refrigerant cycle device.

Abstract: An ejector cycle system with a refrigerant cycle through which refrigerant flows includes an ejector disposed downstream of a radiator, a first evaporator that evaporates refrigerant flowing out of the ejector, a throttling unit located in a branch passage and depressurizes refrigerant to adjust a flow rate of refrigerant, and a second evaporator located downstream of the throttling unit. In the ejector cycle system, a flow ratio adjusting means adjusts a flow ratio between a first refrigerant flow amount depressurized and expanded in a nozzle portion of the ejector and a second refrigerant flow amount drawn into a refrigerant suction port of the ejector, based on a physical quantity related to at least one of a state of refrigerant in the refrigerant cycle, a temperature of a space to be cooled by the first and second evaporators, and an ambient temperature of the space.

Abstract: Overhung axial compressor, chemical reactor and method for compressing a fluid. The overhung axial compressor includes a casing configured to be vertically split along a vertical axis for access to an inside of the casing and a removable cartridge. The removable cartridge is configured to fit inside the casing and to be detachably attached to the casing. The removable cartridge includes a shaft disposed along a horizontal axis, the shaft being configured to rotate about the horizontal axis, a bearing system attached to the removable cartridge and configured to rotationally support a first end of the shaft, and plural blades disposed toward a second end of the shaft such that the second end is overhung inside the casing. The compressor also includes a guide vane mechanism configured to connect to the removable cartridge, the guide vane mechanism being configured to adjust a flow of a fluid to the plural blades.

Abstract: In a refrigeration system having a compressor, a heat rejection heat exchanger, a heat absorption heat exchanger, and a controller for controlling the same, embodiments of a system, apparatus and methods for the same can control at least one refrigeration system component such as an expansion valve responsive to dynamic system conditions.

Abstract: In an integrated unit including an evaporator and an ejector located inside a tank of the evaporator, a first vibration-isolating seal member and a second vibration-isolating seal member are disposed in a gap between an outer surface of the ejector and an inner surface of the tank. The first vibration-isolating seal member is located between a refrigerant discharge port and a refrigerant suction port of the ejector in a longitudinal direction, and the second vibration-isolating seal member is located between a refrigerant flow inlet of the ejector and the refrigerant suction port in the longitudinal direction. Furthermore, the first vibration-isolating seal member has a seal capability lower than that of the second vibration-isolating seal member, and a vibration isolation capability higher than that of the second vibration-isolating seal member.

Abstract: An ejector-type refrigerant cycle device includes: a first evaporator 15 that evaporates refrigerant flowing out of an ejector 14; a branch passage 17 that branches a flow of refrigerant between a radiator 13 and the ejector 14 and guides this flow of refrigerant to a vapor-phase refrigerant suction port 14c of the ejector 14; a throttling mechanism 18 disposed in the branch passage 17; and a second evaporator 19 disposed downstream of the throttling mechanism 18 with respect to the flow of refrigerant. The throttling mechanism 18 is constructed to be provided with a fully opening function, and to fully open the branch passage 17 when the second evaporator 19 is defrosted. Therefore, in an ejector-type refrigerant cycle device including multiple evaporators, the function of defrosting the evaporators can be carried out with a simple construction.

Abstract: A two-stage decompression ejector includes a variable throttle mechanism having a first throttle passage for decompressing a fluid and a valve body for changing a throttle passage area of the first throttle passage, a nozzle having therein a second throttle passage for further decompressing the fluid decompressed by the variable throttle mechanism, and a suction portion for drawing a fluid by a suction effect of a high-velocity jet fluid from the nozzle. The formula of 0.07?Vo×S/vn?0.7 is satisfied, in which Vo is an intermediate-pressure space volume (mm3) from an outlet of the variable throttle mechanism to an inlet of the second throttle passage, S is a throttle passage sectional area (mm2) of a minimum passage sectional area portion of the second throttle passage, and vn is a flow velocity (mm/s) of the fluid passing through the minimum passage sectional area portion.

Abstract: An ejector cycle device includes a compressor that draws and compresses refrigerant, a radiator that radiates heat of high-pressure refrigerant discharged from the compressor, an ejector, a branch passage branched from a refrigerant passage between the radiator and a nozzle portion of the ejector and coupled to a suction port of the ejector, a throttle unit that is arranged in the branch passage and decompresses refrigerant, and an evaporator that is arranged on a downstream side of refrigerant flow of the throttle unit in the branch passage and evaporates refrigerant. Accordingly, even when a suction performance of the ejector is lowered, refrigerant can flow through the evaporator.

Abstract: A first and a second expansion and compression machine (30, 40) having different volume ratios (Vc/Ve) are connected in parallel to a refrigerant circuit (10) of a refrigeration apparatus. Expanders (31, 41) of the expansion and compression machines (30, 40) are connected in parallel. Compressors (32, 42) of the expansion and compression machines (30, 40) are also connected in parallel. Upon variation in the operating condition of the refrigeration apparatus, the ratio of rotation speed between the expansion and compression machines (30, 40) is controlled by a controller (60). This, as a result, allows the refrigeration apparatus to operate at a COP close to an ideal condition.

Abstract: An ejector-type refrigerant cycle device includes: a first evaporator 15 that evaporates refrigerant flowing out of an ejector 14; a branch passage 17 that branches a flow of refrigerant between a radiator 13 and the ejector 14 and guides this flow of refrigerant to a vapor-phase refrigerant suction port 14c of the ejector 14; a throttling mechanism 18 disposed in the branch passage 17; and a second evaporator 19 disposed downstream of the throttling mechanism 18 with respect to the flow of refrigerant. The throttling mechanism 18 is constructed to be provided with a fully opening function, and to fully open the branch passage 17 when the second evaporator 19 is defrosted. Therefore, in an ejector-type refrigerant cycle device including multiple evaporators, the function of defrosting the evaporators can be carried out with a simple construction.

Abstract: A two-stage decompression ejector includes a variable throttle mechanism having a first throttle passage for decompressing a fluid and a valve body for changing a throttle passage area of the first throttle passage, a nozzle having therein a second throttle passage for further decompressing the fluid decompressed by the variable throttle mechanism, and a suction portion for drawing a fluid by a suction effect of a high-velocity jet fluid from the nozzle. The formula of 0.07?Vo×S/vn?0.7 is satisfied, in which Vo is an intermediate-pressure space volume (mm3) from an outlet of the variable throttle mechanism to an inlet of the second throttle passage, S is a throttle passage sectional area (mm2) of a minimum passage sectional area portion of the second throttle passage, and vn is a flow velocity (mm/s) of the fluid passing through the minimum passage sectional area portion.

Abstract: Cooling appliance, which consists of a main tank (1) into which the water at ambient temperature is introduced. Thanks to a pump (2), this water is moved vertically to another cooling tank (3), where some compressors (7) cool the water. The now cold water then falls by gravity to a drip tank (8). This drip tank (8) is provided with micro-openings through which the water again falls by gravity to pass through a filter (9). In practice, this filter (9) is made of several layers of porous material that become soaked with water and, thanks to a fan (10), the cold air is expelled to the exterior.

Abstract: A refrigerant cycle device includes a compressor for compressing refrigerant, a condenser for cooling and condensing high-pressure refrigerant discharged from the compressor, a vapor-liquid separator located at a refrigerant outlet side of the condenser for separating refrigerant from the condenser into vapor refrigerant and liquid refrigerant, a supercooling device for supercooling the liquid refrigerant from the vapor-liquid separator, an ejector having a nozzle part for decompressing refrigerant downstream from a refrigerant outlet side of the condenser and a refrigerant suction port for drawing refrigerant by a high-velocity flow of refrigerant jetted from the nozzle part, a throttle member which decompresses the liquid refrigerant supercooled by the supercooling device, an evaporator located at a downstream side of the throttle member and is connected to the refrigerant suction port of the ejector.

Abstract: A refrigerant cycle device having an ejector includes a first evaporator for evaporating refrigerant flowing out of the ejector, a first passage portion for guiding refrigerant to a refrigerant suction port of the ejector, a throttle unit located in the first passage portion, a second evaporator located in the first passage portion downstream of the throttle unit, a bypass passage portion for guiding hot gas refrigerant from a compressor into the second evaporator, a bypass opening and closing unit provided in the bypass passage portion. Furthermore, a second passage portion is branched from the bypass passage portion downstream of the bypass opening and closing unit, and a flow control unit is provided in the second passage portion to prevent a flow of refrigerant from the first evaporator to the second evaporator through the second passage portion. Therefore, defrosting of both the first and second evaporators can be suitably performed.

Abstract: A branch passage, which is branched at a point on an upstream side of an ejector, is connected to a refrigerant suction inlet of the ejector. An evaporator is arranged in the branch passage, and a capillary tube is arranged on an upstream side of the evaporator.

Abstract: The present invention has an object to provide an ejector cycle and an ejector, according to which a sufficient cooling performance can be obtained even when the input amount of the refrigerant to the ejector is decreased. A passage changeover means having a bypass channel is formed in an ejector. The passage changeover means opens the bypass channel in a bypass cooling operation, in which an input amount of the refrigerant to the ejector is decreased due to a low ambient temperature, and so on. Accordingly, in this bypass cooling operation, the refrigerant from an outside heat exchanger to the ejector bypasses an ejector nozzle and flows to an evaporator through the bypass channel.

Abstract: A vapor-compression refrigerant cycle system having an ejector includes a first evaporator for evaporating refrigerant from a pressure-increasing portion of the ejector, and a second evaporator for evaporating refrigerant to be drawn into a refrigerant suction port of the ejector. Furthermore, a valve member for opening and closing a refrigerant passage of the second evaporator is arranged in serious with the second evaporator in a refrigerant flow, and refrigerant flowing out of the second evaporator flows into the refrigerant suction port through a refrigerant suction pipe. The system is provided to restrict lubrication oil contained in refrigerant from being introduced from the ejector into and staying in the refrigerant suction pipe when the valve member is closed. For example, the refrigerant suction port is provided at an upper side of the ejector.

Abstract: An air conditioner includes a compressor for compressing refrigerant, an exterior heat exchanger for performing heat exchange between refrigerant and outside air, an interior heat exchanger for performing heat exchange between the refrigerant and air to be blown into the compartment, an ejector for decompressing high-pressure refrigerant, a heater core for heating air using a high-temperature fluid as a heating source, and a fluid-refrigerant heat exchanger that heats the fluid flowing to the heater core using high-temperature refrigerant discharged from the compressor as a heating source. In a dehumidifying and heating operation, refrigerant in the interior heat exchanger absorbs heat from air so that the air is cooled and dehumidified, and the dehumidified and cooled air can be further heated in the heater core by indirectly using the heating source from the high-temperature refrigerant.

Abstract: An air conditioner includes a compressor for compressing refrigerant, an exterior heat exchanger for performing heat exchange between refrigerant and outside air, an interior heat exchanger for performing heat exchange between the refrigerant and air to be blown into the compartment, a decompression unit for decompressing high-pressure refrigerant, and a heater that heats air using high-temperature refrigerant discharged from the compressor as a heating source. In a dehumidifying and heating operation, refrigerant in the interior heat exchanger absorbs heat from air so that the air is cooled and dehumidified, and the heater heats air having been dehumidified and cooled by using the heating source, so that low-humidity and high-temperature air is supplied into the compartment. The heater can be disposed to indirectly heat air by heating a fluid flowing through a heater core for heating air, or to directly heat air to be blown into the compartment.

Abstract: In an ejector, a nozzle is provided within a housing to defining a passage portion around the nozzle, and a suction port is provided in the housing to draw a refrigerant by entrainment of a driving refrigerant jetted from the nozzle. Further, a wall portion is provided in the housing such that the refrigerant drawn from the suction port into the passage portion is prevented from flowing toward an inlet side of the nozzle from a position of the suction port in an axial direction of the nozzle. Therefore, all of the refrigerant flowing from the suction port flows toward an outlet side of the nozzle without flowing toward the inlet side of the nozzle from the position of the suction port in the axial direction. Thus, it can prevent a large pressure loss from being caused in the refrigerant sucked from the suction port, and ejector efficiency can be effectively increased.

Abstract: In an ejector cycle having an ejector, a decompression amount of refrigerant between a gas-liquid separator and an evaporator is adjusted by a differential pressure control valve, so that a pressure increasing amount in a pressure increasing portion of the ejector is controlled to be equal to or lower than a predetermined amount. Therefore, a suction pressure of refrigerant to be sucked to the compressor can be restricted from being excessively increased in accordance with the increase of the pressure increasing amount in the ejector, and it can prevent heat radiating capacity of a radiator from being decreased. Thus, a sufficient cooling capacity can be always obtained in the ejector cycle.

Abstract: In an ejector cycle with an ejector including a nozzle for decompressing refrigerant, a variable throttle device is disposed upstream from the nozzle to decompress and expand high-pressure refrigerant flowing from a condenser. For example, the variable throttle device decompresses the high-pressure refrigerant in a gas-liquid two-phase state at an upstream position from the nozzle of the ejector. In addition, the variable throttle device includes a back pressure chamber having an inner pressure that changes by sensing a refrigerant temperature at a refrigerant outlet side of an evaporator, and a pressure introducing means for introducing a refrigerant pressure of a refrigerant outlet side of the evaporator to a side opposite to the back pressure chamber with respect to a diaphragm. Therefore, a pressure difference between the back pressure chamber and the side opposite to the back pressure chamber can be made smaller.

Abstract: The present invention relates to a mist cooler and in particular to a means for cooling the air partially or wholly surrounding a conventional air cooled condenser of an air cooler or a refrigeration unit. The present invention is particularly adaptable as an addition, which works in conjunction with an existing air cooler by lowering the temperature of the air before the air enters the air intake of the air cooler or refrigeration unit. The present invention can be combined as an addition to any air conditioning air cooled condenser for residential, commercial, industrial, or institutional application.

Abstract: A refrigerant management system provides for optimal compressor performance by providing a compressor motor designed to operate at peak efficiency under a first cooling load and at least one sensor for generating a signal that indicates the actual cooling load. A controller is provided that determines any difference between the first cooling load and the actual cooling load from the sensor signal data. The controller is coupled to a refrigerant storage device to either add or remove refrigerant to maintain the system at or near the first cooling load in accordance with the signal form the first sensor indicating the actual cooling load. Consequently, the present invention provides for automatic adjustment of the amount of refrigerant in a cooling loop system to maintain a predetermined cooling load that allows operate a compressor motor to operate at its peak efficiency.

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 refrigerant cycle includes an ejector having a throttle changeable nozzle. In the refrigerant cycle, a control valve having a needle valve controls a pressure of a middle-pressure refrigerant in a bypass passage, and a pilot valve controls a throttle opening degree of the nozzle in accordance with a pressure difference between the pressure of the middle-pressure refrigerant in the bypass passage and the refrigerant pressure in a high-pressure refrigerant inlet port of the ejector. When an opening degree of the needle valve is changed in accordance with a load variation or a load state, the pressure of the middle-pressure refrigerant in the bypass passage is changed. Accordingly, the moving position of the pilot valve is controlled, and the throttle opening degree of the nozzle is controlled.

Abstract: An ejector includes a nozzle and a needle valve formed in a tapered shape. The needle valve controls a throttle opening degree of the nozzle from a minimum degree to a maximum degree while an end section of the needle valve is positioned on a downstream side with respect to a throat section of the nozzle. Besides, a cross-sectional area of a nozzle diffuser is formed to be substantially constant, downstream of the throat section. Thus, a cross-sectional area of a substantial refrigerant passage defined by an inner surface of the nozzle and the needle valve is gradually widened in accordance with the tapered shape of the needle valve. Therefore, pressure loss accompanied with a rapid expanding can be suppressed. As a result, the throttle opening degree of the nozzle can be controlled while improving nozzle efficiency and ejector efficiency.

Abstract: Process and system to produce nearly oil free ammonia using a rotary compressor with liquid injection from a separator tank where the liquid in the tank includes oil and liquid ammonia. The level of oil in the compressed ammonia leaving the separator is much lower than in conventional separators with coalescing elements, because the temperature is lower and there is less oil departure in oil vapor form.

Abstract: An ejector for a refrigerant cycle includes a nozzle having therein a refrigerant passage, and a needle valve provided in the refrigerant passage of the nozzle upstream from a throat portion of the nozzle. The needle valve is disposed in the nozzle to define therebetween a throttle portion that is positioned upstream from the throat portion. A top end portion of the needle valve and an inner wall of the nozzle are formed, so that refrigerant is decompressed to a gas-liquid two-phase state at upstream of the throat portion. Accordingly, a throttle degree of the nozzle can be variably controlled while ejector efficiency is not deteriorated.

Abstract: In an ejector cycle system, a variable throttle is disposed at an upstream side of an ejector. When high-pressure side refrigerant pressure in the ejector cycle system is approximately equal to or higher than critical pressure of the refrigerant, the variable throttle is fully opened. When the high-pressure side refrigerant pressure is approximately lower than the critical pressure of the refrigerant, a throttle open degree of the variable throttle is reduced from the fully open degree so that high-pressure side refrigerant is decompressed in two steps of the variable throttle and the ejector. Accordingly, in both cases of a high heat load and a low heat load of the ejector cycle system, COP of the ejector cycle system can be improved.

Abstract: In an ejector-type depressurizer, a nozzle arrangement converts pressure energy of refrigerant supplied from a radiator into velocity energy to depressurize and expand the refrigerant, and a pressurizer arrangement mixes the refrigerant discharged from the nozzle arrangement with the refrigerant drawn from an evaporator and converts the velocity energy of the refrigerant discharged from the nozzle arrangement into pressure energy to increase the pressure of the mixed refrigerant discharged from the pressurizer arrangement. The pressurizer arrangement includes a refrigerant passage that conducts the refrigerant supplied from the nozzle arrangement and the refrigerant supplied from the evaporator, and the refrigerant passage includes a refrigerant passing zone, through which the refrigerant from the nozzle arrangement and the refrigerant from the evaporator mainly pass during operation of the ejector-type depressurizer.

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 first check valve 620 for allowing refrigerant to flow only from a compressor 100 to an evaporator 300 (a refrigerant passage 510) is provided in a hot-gas passage 600 that conducts refrigerant discharged from the compressor 100 into the evaporator 300 without passing through a radiator 200 and an ejector 400. Therefore, the refrigerant can be prevented from flowing into the hot-gas passage 600 during normal operation. In normal operation, the refrigerant in the hot gas passage 600 from the low pressure side (on the side of the evaporator 300) can be prevented from being retained in the hot-gas passage 600, so that the required amount of refrigerant can be reduced and the cost of producing the ejector circuit can be also reduced.

Abstract: In an ejector used for an ejector cycle system, a nozzle has a first refrigerant passage, a second refrigerant passage, and a third refrigerant passage in this order in a refrigerant flow direction from a refrigerant inlet toward a refrigerant outlet of the nozzle. The first refrigerant passage, the second refrigerant passage and the third refrigerant passage are formed into cylindrical shapes, respectively, each having a constant passage diameter. Further, a pressure increasing portion of the ejector is also formed into a cylindrical shape having a constant passage diameter. Accordingly, the ejector can be readily manufactured in low cost.

Abstract: An ejector for a refrigerant cycle includes a nozzle having therein a refrigerant passage, and a needle valve provided in the refrigerant passage of the nozzle upstream from a throat portion of the nozzle. The needle valve is disposed in the nozzle to define therebetween a throttle portion that is positioned upstream from the throat portion. A top end portion of the needle valve and an inner wall of the nozzle are formed, so that refrigerant is decompressed to a gas-liquid two-phase state at upstream of the throat portion. Accordingly, a throttle degree of the nozzle can be variably controlled while ejector efficiency is not deteriorated.

Abstract: In an ejector cycle system, high-pressure side refrigerant is decompressed by an ejector in cooling operation for cooling a compartment, and is decompressed by a fixed restrictor in heating operation for heating the compartment. Therefore, in the heating operation, the pressure of refrigerant to be sucked into a compressor can be made lower, and the temperature of refrigerant discharged from the compressor is increased. Alternatively, in the cooling operation, a flow direction of refrigerant flowing through at least one of an exterior heat exchanger and an interior heat exchanger is identical to that in the heating operation.

Abstract: A first check valve 620 for allowing refrigerant to flow only from a compressor 100 to an evaporator 300 (a refrigerant passage 510) is provided in a hot-gas passage 600 that conducts refrigerant discharged from the compressor 100 into the evaporator 300 without passing through a radiator 200 and an ejector 400. Therefore, the refrigerant can be prevented from flowing into the hot-gas passage 600 during normal operation. In normal operation, the refrigerant in the hot gas passage 600 from the low pressure side (on the side of the evaporator 300) can be prevented from being retained in the hot-gas passage 600, so that the required amount of refrigerant can be reduced and the cost of producing the ejector circuit can be also reduced.

Abstract: In an ejector cycle system, a variable throttle is disposed at an upstream side of an ejector. When high-pressure side refrigerant pressure in the ejector cycle system is approximately equal to or higher than critical pressure of the refrigerant, the variable throttle is fully opened. When the high-pressure side refrigerant pressure is approximately lower than the critical pressure of the refrigerant, a throttle open degree of the variable throttle is reduced from the fully open degree so that high-pressure side refrigerant is decompressed in two steps of the variable throttle and the ejector. Accordingly, in both cases of a high heat load and a low heat load of the ejector cycle system, COP of the ejector cycle system can be improved.