Abstract: In a refrigerant cycle system, a compression mechanism of an electric compressor sucks and compresses refrigerant, and an electric motor that drives the compression mechanism is cooled by the refrigerant. A variable throttle mechanism decompresses the refrigerant discharged from the electric compressor. A motor temperature detector detects a temperature of the electric motor. A motor protection determiner determines whether the temperature of the electric motor detected by the motor temperature detector is equal to or higher than a criterion value. A motor protection controller controls the variable throttle mechanism so that an opening degree of the variable throttle mechanism does not decrease when the motor protection determiner determines that the temperature of the electric motor is equal to or higher than the criterion value.

Abstract: The invention concerns a refrigerant compressor arrangement (1) with a housing (2, 3) comprising a suction opening (5), a compressor (15), which is arranged in the housing (2, 3), and is connected to the suction opening (5), and a suction connection (20) that is fixed at the housing (2, 3), and comprises a housing section (21) and a tube section (22), the housing section (21) being connected to the suction opening (5) and the diameter of the tube section (22) being different from the diameter of the housing section (21). With such a refrigerant compressor arrangement, it is endeavoured to keep the dimensions small. For this purpose, in the longitudinal direction of the suction connection (20) the housing section (21) and the tube section (22) overlap each other and are connected to each other by a corrugated area (23) with at least one radial corrugation.

Abstract: A vapor compression refrigerating cycle apparatus includes a compressor, a radiator, first and second throttle devices, a flow distributor, an ejector, a suction passage, and first and second evaporators. The flow distributor separates refrigerant decompressed through the first throttle device into a first passage and a second passage. The first passage is in communication with a nozzle portion of the ejector. The second passage is in communication with a suction portion of the ejector through the suction passage. The second throttle device and the second evaporator are disposed on the suction passage. The flow distributor is configured to be capable of adjusting a ratio of a flow rate of refrigerant passing through the second passage to a flow rate of refrigerant passing through the first passage in accordance with a heat load of at least one of the radiator, the first evaporator and the second evaporator.

Abstract: An ejector device includes a nozzle having an inner wall surface defining a circular cross-sectional fluid passage extending from an inlet to a jet port. Furthermore, the fluid passage has a throat portion at a position between the inlet and the jet port, and a passage expanding portion in which the cross-sectional area of the fluid passage is enlarged from the throat portion as toward downstream. The passage expanding portion includes a middle portion in which the inner wall surface is expanded in a fluid flow direction by a first expanding angle, and an outlet portion from a downstream end of the middle portion to the jet port, in which the inner wall surface is expanded in the fluid flow direction by a second expanding angle that is larger than the first expanding angle. The ejector device can be suitably used for a refrigeration cycle apparatus.

Abstract: A vapor compression refrigerating cycle apparatus includes a compressor, a radiator, a first decompressing device, a second decompressing device, a flow distributor, an ejector, and a suction-side evaporator. The vapor compression refrigerating cycle apparatus is configured such that refrigerant pressure (P0) at an inlet of the first decompressing device, refrigerant pressure (P) at an inlet of a nozzle portion of the ejector, refrigerant pressure (P2) at an outlet of the nozzle portion satisfy a pressure relationship of 0.1×(P0?P2)?(P0?P)?0.6×(P0?P2). Alternative to or in addition to the pressure relationship, the vapor compression refrigerating cycle apparatus is configured such that a dryness of refrigerant at the inlet of the nozzle portion is in a range between 0.003 and 0.14.

Abstract: A refrigeration system (1) includes first to third compressors (11a, 11b, 11c) connected in parallel and an oil separator for separating a refrigeration oil from a refrigerant discharged from the compressors (11a, 11b, 11c). A main suction pipe (55) in which a refrigerant to be sucked into the compressors (11a, 11b, 11c) flows includes a primary curved portion (101) and a primary branch element (102) assembled to part of the main suction pipe (55) downstream of a junction with an oil return pipe (71) for returning the refrigeration oil separated by the oil separator. The main suction pipe (55) is branched by the primary branch element (102) into a first suction pipe branch (61a) of the first compressor (11a) and a connecting suction pipe (56). In the primary branch element (102), the first suction pipe branch (61a) is at the bottommost position and the outermost position in the direction of a radius of curvature of the primary curved portion (101).

Abstract: In a refrigerating apparatus using a refrigerant so that the refrigerant discharged from a compressor becomes a supercritical state, a refrigerating ability runs short. Therefore, to rapidly perform cooling, the amount of the refrigerant to be filled has to be increased. On the other hand, another problem occurs that a large amount of excessive refrigerant is generated in a refrigerant circuit when where the refrigerating apparatus is sufficiently cooled. In the present invention, a refrigerating circuit in which a compressor, a gas cooler, a first pressure reducing unit and an evaporator are successively annularly connected to one another via pipes includes a second pressure reducing unit and a liquid receiver between the gas cooler and the first pressure reducing unit, and the liquid receiver is connected to the suction port of the compressor via a pipe.

Abstract: A refrigerant pressurization system including an ejector having a first conduit for flowing a liquid refrigerant therethrough and a nozzle for accelerating a vapor refrigerant therethrough. The first conduit is positioned such that the liquid refrigerant is discharged from the first conduit into the nozzle. The ejector includes a mixing chamber for condensing the vapor refrigerant. The mixing chamber comprises at least a portion of the nozzle and transitions into a second conduit having a substantially constant cross sectional area. The condensation of the vapor refrigerant in the mixing chamber causes the refrigerant mixture in at least a portion of the mixing chamber to be at a pressure greater than that of the refrigerant entering the nozzle and greater than that entering the first conduit.

Abstract: The present invention includes the equipment and processes necessary to convert packaged air-cooled rooftop HVAC units so that they may be served off of a centralized, water-cooled, refrigeration system thereby increasing the energy efficiency and reliability of the HVAC units, and potentially reduce maintenance costs for facilities with multiple packaged air-cooled rooftop HVAC units.

Abstract: A refrigerating device comprising a tubular evaporator which is connected to a compressor by means of a suction line. A coolant pipe of the tubular evaporator forms a plurality of serially connected tubular loops and one ascending outlet tube connecting the tubular loop that lies the furthest downstream to the suction pipe. The tubular loops have a course that ascends in the direction of the flow of the coolant for a distance that corresponds at least to the length of the outlet tube.

Abstract: A heating/cooling system has improved operating efficiencies due to low superheat provisions and a specially configured compressor oil return. For certain systems, such as direct exchange geothermal heating/cooling applications having sub-surface heat exchanges extending at least 100 feet below the surface and using R-410A refrigerant, a specific compressor oil may be used to further improve efficiency.

Abstract: In an evaporator unit for a refrigerant cycle device, an evaporator is connected to an ejector to evaporate refrigerant to be drawn into a refrigerant suction port of the ejector or the refrigerant flowing out of the outlet of the ejector. The evaporator includes a plurality of tubes in which the refrigerant flows, and a tank configured to distribute the refrigerant into the tubes or to collect the refrigerant from the tubes. The ejector is located in the tank, and the nozzle portion is brazed to the tank to be fixed into the tank. The tank may be a header tank directly connected to the tubes or may be a separate tank separated from the header tank.

Abstract: An ejector type refrigerating cycle comprises a compressor, a heat radiating device, an ejector, and a first vaporizing device, which are connected in a circuit to form a refrigerating cycle. A bypass passage is provided between an inlet port and a suction port of the ejector, so that a part of the refrigerant is bifurcated to flow through the bypass passage. A second vaporizing device is provided in the bypass passage. An internal heat exchanger is further provided between an outlet side of the heat radiating device and the inlet side of the ejector, so that the enthalpy of the high-pressure refrigerant from the heat radiating device is reduced, to thereby increase an enthalpy difference between the inlet side and outlet side of the first and second vaporizing devices. As a result, the cooling capability by the both vaporizing devices can be improved.

Abstract: An ejector cycle system with a refrigerant cycle through which refrigerant flows includes an ejector disposed downstream of a radiator, a first evaporator located to evaporate refrigerant flowing out of the ejector, a branch passage branched from a branch portion between the radiator and a nozzle portion of the ejector and coupled to a refrigerant suction port of the ejector, a throttling unit located in the branch passage, and a second evaporator located downstream of the throttling unit to evaporate refrigerant. In the ejector cycle system, a variable throttling device is located in a refrigerant passage between a refrigerant outlet of the radiator and the branch portion to decompress the refrigerant flowing out of the radiator.

Abstract: In a refrigerant cycle device with an ejector, a branch portion is located at an upstream side of a nozzle portion of the ejector so that the refrigerant flowing out of an exterior heat exchanger is branched into first and second streams in a cooling operation mode. A passage switching portion is configured such that the refrigerant of the first stream flows through the nozzle portion of the ejector, and the refrigerant of the second stream flows through the decompression unit, the using-side heat exchanger, and the refrigerant suction port of the ejector, in the cooling operation mode. In contrast, the refrigerant discharged from the compressor flows into the nozzle portion after passing through the using-side heat exchanger, and the refrigerant flowing out of the exterior heat exchanger flows into the refrigerant suction port of the ejector, in the heating operation mode.

Abstract: An ejector-type cycle, for exchanging heat using a refrigerant, comprises: a compressor for compressing the refrigerant; a condenser for condensing the compressed refrigerant, a first orifice arranged downstream of the condenser; an ejector arranged downstream of the first orifice and capable of exhibiting a sucking force at the inlet thereof; a first evaporator for exchanging heat with an external fluid by passing the refrigerant and having a refrigerant outlet connected to the inlet of the ejector; a dryness degree adjusting mechanism interposed between the first orifice and the ejector and connected to the ejector and the first evaporator so as to supply the refrigerant thereto, and a second orifice arranged downstream of and connected to the dryness degree adjusting mechanism.

Abstract: A novel pressure-exchange ejector is disclosed whereby a high energy primary fluid transports and pressurizes a lower energy secondary fluid through direct fluid-fluid momentum exchange. The pressure-exchange ejector utilizes non-steady flow principles and both supersonic flow and subsonic flow embodiments are disclosed. The invention provides an ejector-compressor/pump which can attain substantially higher adiabatic efficiencies than conventional ejectors while retaining much of the simplicity of construction and the low manufacturing cost of a conventional ejector. Embodiments are shown which are appropriate for gas compression applications such as are found in ejector refrigeration, fuel cell pressurization, water desalinization, and power generation topping cycles, and for liquid pumping applications such as marine jet propulsion and slurry pumping.

Abstract: A refrigeration-cycle component assembly includes a pipe connecting member, a box temperature-sensitive expansion valve, an ejector, a passenger-compartment high-pressure pipe, and a passenger-compartment low-pressure pipe. The component assembly is provided in a flat space, which is defined at a side of an air-conditioning unit in a vehicle transverse direction, and which is flat in the vehicle transverse direction. The pipe connecting member and the refrigerant suction portion are intensively arranged at a vehicle front side in the flat space. The component assembly is entirely covered by a heat insulating member.

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: 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: A first evaporator connected to an outlet side of an ejector, a second evaporator connected to a refrigerant suction port of the ejector, a throttle mechanism arranged on an inlet side of a refrigerant flow of the second evaporator and for reducing the pressure of the refrigerant flow are provided. Furthermore, the ejector, the first evaporator, the second evaporator and the throttle mechanism are assembled integrally with each other to construct an integrated unit having one refrigerant inlet and one refrigerant outlet. Hence, mounting performance of an ejector type refrigeration cycle can be improved.

Abstract: A refrigerant circuit (10) of a refrigeration apparatus is filled up with carbon dioxide as a refrigerant. In the refrigerant circuit (10), a first compressor (21) and a second compressor (22) are arranged in parallel. The first compressor (21) is connected to both an expander (23) and a first electric motor (31), and is driven by both of the expander (23) and the first electric motor (31). On the other hand, the second compressor (22) is connected only to a second electric motor (32), and is driven by the second electric motor (32). In addition, the refrigerant circuit (10) is provided with a bypass line (40) which bypasses the expander (23). The bypass line (40) is provided with a bypass valve (41). And, the capacity of the second compressor (22) and the valve opening of the bypass valve (41) are regulated so that the COP of the refrigeration apparatus is improved after enabling the refrigeration apparatus to operate properly in any operation conditions.

Abstract: An ejector cycle device includes a compressor, a refrigerant radiator disposed to radiate heat of refrigerant discharged from the compressor, an ejector having a nozzle, a first evaporator for evaporating refrigerant from the ejector, a branch passage, which is branched from a refrigerant downstream side of the refrigerant radiator and is connected to a refrigerant suction port of the ejector, a throttle member disposed in the branch passage to decompress refrigerant flowing from the refrigerant radiator, a second evaporator disposed in the branch passage between the throttle member and the refrigerant suction port of the ejector, and a gas-liquid separator having an inlet connected to a downstream side of the first evaporator and an outlet from which gas refrigerant is introduced to a refrigerant suction side of the compressor. Thus, refrigerant amounts flowing to the first and second evaporators can be suitably controlled.

Abstract: A control system and method are provided for the automatic startup and shutdown of a steam turbine driven chiller unit. The chiller unit includes an integrated central control panel to control operation of both the steam turbine system and the refrigerant system. The central control panel has a startup control system to automatically start the steam turbine driven chiller unit while performing necessary protective actions and a shutdown control system to automatically stop the steam turbine driven chiller unit while performing necessary protective actions.

Abstract: A control system and method for interactive startup and shutdown of a steam turbine driven chiller unit is provided. The chiller unit includes an integrated central control panel to control operation of both the steam turbine system and the refrigerant system. The central control panel has startup control system to assist an operator manually start the steam turbine system and the refrigerant system and a shutdown control system to assist an operator manually shutdown the steam system and the refrigerant system. Both the startup control system and the shutdown control system include logic for performing necessary protective actions and for notifying an operator when to perform required actions.

Abstract: Methods and systems are provided for cooling an object with a cryogen having a critical point defined by a critical-point pressure and a critical-point temperature. A pressure of the cryogen is raised above a pressure value determined to provide the cryogen at a reduced molar volume that prevents vapor lock. Thereafter, the cryogen is placed in thermal communication with the object to increase a temperature of the cryogen along a thermodynamic path that maintains the pressure greater than the critical-point pressure for a duration that the cryogen and object are in thermal communication.

Abstract: An ejector cycle device includes an ejector having a nozzle portion which decompresses refrigerant flowing out of a radiator, a first evaporator for evaporating refrigerant from the ejector, and a second evaporator provided in a branch passage that is branched from a position between the refrigerant radiator and the ejector and is connected to a refrigerant suction port of the ejector. Furthermore, a throttle member is disposed in the branch passage to decompress refrigerant and adjust a flow amount of refrigerant, and the second evaporator is disposed in the branch passage between the throttle member and the refrigerant suction port. In the ejector cycle device having both the first and second evaporators, a defrosting operation of one the first and second evaporators can be performed while the other one of the first and second evaporators is operated to have a cooling function.

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: An ejector cycle with an ejector includes a nozzle for decompressing refrigerant. A receiver for storing refrigerant is disposed at a refrigerant outlet side of a condenser. A bypass passage and a switching valve for opening and closing the bypass passage are provided so that high-temperature refrigerant discharged from a compressor is introduced into an evaporator while bypassing the condenser in a defrosting operation. When the defrosting operation is set, the switching valve is opened while a fan for blowing cool air to the condenser is operated. A part of refrigerant discharged from the compressor flows into the evaporator to remove frost on a surface of the evaporator.

Abstract: An ejector for a refrigerant cycle device includes a nozzle portion for decompressing and expanding refrigerant flowing therein, and a body portion which accommodates the nozzle portion to support the nozzle portion at a support portion. The body portion has a refrigerant suction port from which refrigerant is drawn by a high-speed refrigerant flow jetted from a nozzle outlet of the nozzle portion. The nozzle portion is located in the body portion to have an ejector refrigerant passage through which the refrigerant flows. In the ejector, the nozzle portion is supported in the body portion to have the following relationship of 0<L/d?14, in which L/d is a ratio of a length (L) between a downstream tip portion of the support portion and the nozzle outlet to a diameter (d) of the nozzle outlet.

Abstract: A vapor-compression refrigerant cycle device includes an ejector, a first evaporator for evaporating refrigerant flowing out of a pressure-increasing portion of the ejector, a second evaporator for evaporating refrigerant to be drawn into a refrigerant suction port of the ejector. In the refrigerant cycle device, a refrigerant suction pipe is connected to a refrigerant outlet of the second evaporator and the refrigerant suction port of the ejector, and the surface of the refrigerant suction pipe is covered by an insulating member. Furthermore, the ejector, the first evaporator, the second evaporator and the refrigerant suction pipe are arranged in a passenger compartment of the vehicle.

Abstract: A refrigerator door having a dispenser is disclosed. The refrigerator door includes an outer case forming a front appearance of the refrigerator door, an inner case forming a rear appearance of the refrigerator door, and an insulation layer disposed between the outer case and the inner case. First and second mounting frames are installed at both side ends of the refrigerator door and have first and second mounting slots longitudinally formed in the first and second mounting frames in opposition to each other. The dispenser is detachably coupled to a front surface of the outer case and includes a housing, which forms an external appearance of the dispenser and is formed with a recess section. An external plate section is coupled to the front surface of the outer case except for an area in which the dispenser is installed, forming an external appearance of the refrigerator door.

Abstract: In an ejector, a nozzle includes a nozzle tapered section having an inner passage with a radial dimension reduced toward a nozzle outlet port, and a needle having a needle tapered section disposed in the inner passage. The needle tapered section has a cross sectional area reduced toward a downstream end of the needle, and the downstream end of the needle is positioned at a downstream side with respect to the nozzle outlet port. In addition, the nozzle tapered section has a taper angle (?1) which is equal to or greater than a taper angle (?2) of the needle tapered section. Therefore, a boundary face on the outside of a nozzle jet flow becomes in a balanced natural shape, and is controlled in accordance with an operating condition. Thus, the ejector cycle can be operated while keeping high efficiency, regardless of the thermal load of the ejector cycle.

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 refrigerant distribution device 10 situated in an inlet header 12 of a multiple tube heat exchanger 14 of a refrigeration system 20. The device 10 includes an inlet passage 32 that is in communication with an expansion device. Small diameter conduits 34 are disposed within the inlet header 12 and are in fluid communication with the inlet passage 32. A two-phase refrigerant fluid in the inlet passage 32 has a refrigerant liquid-vapor interface 38. The conduits 34 have inlet ports 40 that lie below the refrigerant liquid-vapor interface 38. Vapor emerging from the nozzles 34 create a homogeneous refrigerant that is uniformly delivered to the multiple tubes. The invention also includes a method for delivering a uniform distribution of a homogeneous liquid mixture of liquid and vaporous refrigerant through the heat exchanger tubes.

Abstract: In a refrigerant cycle device, a radiator has a heat radiating portion for radiating high-pressure refrigerant discharged from a compressor and a refrigerant outlet downstream from the heat radiating portion, an ejector includes a nozzle portion for decompressing and expanding refrigerant and a refrigerant suction port for sucking refrigerant by high-velocity refrigerant flow jetted from the nozzle portion. The refrigerant cycle device includes a throttle unit for decompressing refrigerant flowing out of the refrigerant outlet of the radiator, an evaporator located between a refrigerant downstream side of the throttle unit and the refrigerant suction port of the ejector, and a branch portion located within the heat radiating portion of the radiator to branch a refrigerant flow. In the refrigerant cycle device, the nozzle portion has a nozzle inlet coupled to the branch portion so that refrigerant flows into the nozzle inlet from the branch portion of the radiator.

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: A refrigerant cycle device includes an ejector having a nozzle portion for decompressing refrigerant and a refrigerant suction port from which refrigerant is drawn by a high-speed refrigerant stream jetted from the nozzle portion, and a refrigerant branch passage branched from an upstream side of the nozzle portion in a refrigerant flow such that refrigerant flows into the refrigerant suction port through the refrigerant branch passage. Furthermore, a first heat exchanger is disposed to evaporate refrigerant flowing out of the ejector, a second heat exchanger is disposed in the refrigerant branch passage to evaporate refrigerant, and a temperature sensor is located to detect a temperature so as to detect a frost in the second heat exchanger. In addition, a controller performs a frost prevention control for reducing the frost in the second heat exchanger, in accordance with the temperature detected by the temperature sensor.

Abstract: An object of the invention is to effectively defrost multiple a vaporizing devices provided in an ejector cycle. In one of the embodiments, electric heating devices are provided for the respective first and second vaporizing devices, to carry out defrosting operations for each vaporizing device. In addition, a defrosting operation is carried out for the second vaporizing device by hot-gas from a compressor.

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 first evaporator is arranged on a downstream side of an ejector, and a second evaporator is connected to a refrigerant suction inlet of the ejector. A refrigerant evaporation temperature of the second evaporator is lower than that of the first evaporator. The first and second evaporators are used to cool a common subject cooling space and are arranged one after the other in a flow direction of air to be cooled.

Abstract: An integrated unit for a refrigerant cycle device includes an ejector having a nozzle part for decompressing refrigerant, and an evaporator located to evaporate the refrigerant to be drawn into a refrigerant suction port of the ejector or the refrigerant discharged from an outlet of the ejector. The evaporator includes a plurality of tubes defining refrigerant passages through which refrigerant flows, a tank that is disposed at one end side of the tubes for distributing refrigerant into the tubes and for collecting the refrigerant from the tubes. The tank extends in a tank longitudinal direction that is parallel to an arrangement direction of the tubes, and is provided with an end portion in the tank longitudinal direction. Furthermore, the end portion has a hole portion for inserting the ejector, and the ejector is inserted into an inner space of the tank from the hole portion.

Abstract: A heat exchanger includes a plurality of fluid passages through which a heat-exchanger fluid including a liquid-phase fluid passes, a tank disposed above inlet parts of the fluid passages for distributing a flow of the heat-exchanger fluid to the fluid passages, and a retention member that is located above the inlet parts within the tank, for temporarily storing therein the liquid-phase fluid flowing into the tank. The retention member is constructed such that the liquid-phase fluid overflowing from the retention member falls toward the inlet part. Accordingly, the heat-exchanger fluid can be uniformly distributed into the fluid passages from the tank. For example, the heat exchanger can be used as an evaporator for a refrigerant cycle device having an ejector.

Abstract: A unit for a refrigerant cycle device includes an ejector that has a nozzle part which decompresses refrigerant, and a refrigerant suction port from which refrigerant is drawn by a high-speed refrigerant flow jetted from the nozzle part, a first evaporator connected to the outlet of the ejector, and a second evaporator connected to the refrigerant suction port of the ejector. One of the first evaporator and the second evaporator has a tank structure that includes a tank for distributing refrigerant into or for collecting the refrigerant from refrigerant passages of a heat exchanging part. The tank has therein a first space through which the refrigerant discharged from the outlet of the ejector flows into a heat exchanging part of the first evaporator, and a second space through which the refrigerant to be drawn into the refrigerant suction port flows into a heat exchanging part of the second evaporator.

Abstract: An evaporator unit includes an ejector, an upwind side heat exchanger for evaporating a discharge side refrigerant flowing from the ejector, and a downwind side heat exchanger for evaporating a suction side refrigerant to be drawn into the ejector. The ejector has a nozzle for decompressing refrigerant, and a refrigerant suction port, from which refrigerant is drawn by a high-speed flow of refrigerant jetted from the nozzle. The upwind side heat exchanger has a refrigerant superheat area, which is offset from a refrigerant superheat area of the downwind side heat exchanger in a direction perpendicular to an air flow to be cooled.

Abstract: An ejector including a nozzle 17 having a high pressure space 18 into which a high pressure coolant flows from an inlet 17a and a throttle portion 17c for reducing a passage area of the high pressure coolant from the high pressure space 18 to jet port 17b, a needle valve 19 for changing opening of the throttle portion 17c by undergoing displacement in an axial direction R of the throttle portion 17c, and a suction space 22 in which a jet port 17b and a gaseous phase coolant inlet 22a are arranged, wherein an end portion 19c of the needle valve 19 on the side opposite to the jet port is arranged on an opposite side end portion space 21 as a space different from the high pressure space 18 and is communicated with the suction space 22.

Abstract: A variable displacement compressor driven by an engine, such as an engine for driving an automotive vehicle is used as a compressor, and the capacity of the compressor is controlled by a capacity control valve such that the differential pressure between discharge pressure and suction pressure of refrigerant becomes equal to a predetermined differential pressure determined by an external signal. Pressure substantially equal to pressure applied across the compressor is applied across the ejector, and therefore to control the differential pressure across the compressor is to control the differential pressure across the ejector. A differential pressure valve disposed between a gas-liquid separator and an evaporator is set to a differential pressure approximately proportional to the differential pressure across the ejector.

Abstract: The invention relates to a variable capacity type ejector capable of more precisely adjusting a flow rate of refrigerant in a range in which a displacement means can displace a needle and also capable of increasing a flow rate of refrigerant when the needle valve is fully opened. In the needle valve 24 which changes the degree of opening (throat portion area) of the nozzle 18 when the needle is displaced in the axial direction R of the throttle portion 18b, the second tapered portion 24b is formed on the throat portion 18a side of the first tapered portion 24a, and the taper angle ?2 of the second tapered portion 24b is formed larger than the taper angle ?1 of the first tapered portion 24a.

Abstract: A first evaporator evaporates refrigerant, which is outputted from an ejector. A refrigerant outlet of the first evaporator is connected to a suction inlet of a compressor, which is connected to a radiator. A branched passage branches a flow of the refrigerant at a corresponding branching point located between the radiator and the ejector. The branched passage conducts the branched flow of the refrigerant to a suction inlet of the ejector. A flow rate control valve is arranged in the branched passage between a radiator and an ejector on a downstream side of the radiator to depressurize refrigerant outputted from the radiator. A second evaporator is arranged in the first branched passage.

Abstract: Cooling control device for a condenser is provided which includes the condenser, a cooling device for cooling the condenser, and a control device for controlling the cooling device. The cooling device includes a first cooling fan for cooling a gaseous-phase portion of the condenser, and two second cooling fans for cooling a liquid-phase portion of the condenser independently of the first cooling fan. The control device also includes a pressure control section for optimally adjusting a pressure within the gaseous-phase portion, and a temperature control section for optimally adjusting a temperature within the liquid-phase portion. The pressure control section operates the first cooling fan, in accordance with a detected pressure within the gaseous-phase portion, to adjust the pressure within the gaseous-phase portion.