When a temperature of feed air blown into a space for air conditioning cannot be increased up to the target temperature in an indoor condenser of a heat pump cycle included in a gas injection cycle, the volume of the feed air flowing into the indoor condenser is decreased. Thus, the temperature of t
When a temperature of feed air blown into a space for air conditioning cannot be increased up to the target temperature in an indoor condenser of a heat pump cycle included in a gas injection cycle, the volume of the feed air flowing into the indoor condenser is decreased. Thus, the temperature of the refrigerant condensed by the indoor condenser is increased, while the amount of a compression work in a high-pressure side compression stage of the compressor is increased, which suppresses the lack of the heating capacity of the feed air blown into the space for air conditioning.
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1. A refrigerant cycle device, being applied to an air conditioner for a vehicle, comprising: a two-stage compression compressor configured to compress a low-pressure refrigerant sucked from a suction port and to discharge a high-pressure refrigerant from a discharge port, while allowing an intermed
1. A refrigerant cycle device, being applied to an air conditioner for a vehicle, comprising: a two-stage compression compressor configured to compress a low-pressure refrigerant sucked from a suction port and to discharge a high-pressure refrigerant from a discharge port, while allowing an intermediate-pressure refrigerant in a refrigerant cycle to flow thereinto to combine the intermediate-pressure refrigerant with the refrigerant under a compression stage via an intermediate-pressure port;a user-side heat exchanger configured to exchange heat between the high-pressure refrigerant discharged from the discharge port and a fluid for heat exchange to thereby heat the fluid for heat exchange;a high-pressure side decompressor configured to decompress the high-pressure refrigerant flowing from the user-side heat exchanger into an intermediate-pressure refrigerant;a gas-liquid separator configured to separate the intermediate-pressure refrigerant decompressed by the high-pressure side decompressor into gas and liquid phases to flow out the separated gas-phase refrigerant toward the intermediate-pressure port;a low-pressure side decompressor configured to decompress the liquid-phase refrigerant separated by the gas-liquid separator into a low-pressure refrigerant;an evaporator configured to evaporate the low-pressure refrigerant decompressed by the low-pressure side decompressor and to flow out the refrigerant toward the suction port;a flow rate adjustment portion configured to adjust a flow rate of the fluid for heat exchange which is to flow into the user-side heat exchanger; anda controller configured to control the flow rate adjustment portion, whereinthe fluid for heat exchange is feed air blown into a vehicle compartment, the user-side heat exchanger is disposed in a casing forming therein an air passage for the feed air, andthe controller is configured to, when the controller determines that a temperature of the fluid for heat exchange adjusted by at least the user-side heat exchanger is equal to or less than a target temperature of the fluid for heat exchange and the controller determines that the number of revolutions of the two-stage compression compressor is equal to a maximum number of revolutions or the present valve opening of the high-pressure side decompressor is equal to a maximum valve opening, the-controller controls control the flow rate adjustment portion to decrease the flow rate of the fluid for heat exchange which is to flow into the user-side heat exchanger such that a refrigerant pressure within the user-side heat exchanger is increased, whereby a heating capacity in the refrigerant cycle is increased. 2. The refrigerant cycle device according to claim 1, wherein when the temperature of the fluid for heat exchange adjusted by at least the user-side heat exchanger is equal to or less than the target temperature of the fluid for heat exchange, the high-pressure side decompressor increases a throttle opening degree. 3. The refrigerant cycle device according to claim 1, wherein a bypass passage is provided in the casing to allow the feed air to bypass the user-side heat exchanger, andthe flow rate adjustment portion includes an air mix door for adjusting a rate of the volume of the feed air passing through the user-side heat exchanger to that of the feed air passing through the bypass passage among the feed airs. 4. The refrigerant cycle device according to claim 3, wherein the controller includes an air mix door controller configured to control an operation of the air mix door, andwhen the temperature of the feed air adjusted by at least the user-side heat exchanger is equal to or less than the target temperature of the feed air, the air mix door controller is adapted to delay responsivity of the operation of the air mix door as compared to when the temperature of the feed air adjusted by the user-side heat exchanger is higher than the target temperature of the feed air. 5. The refrigerant cycle device according to claim 4, further comprising a heat exchange capacity changing portion configured to change a heat exchange capacity between the refrigerant and the feed air in the user-side heat exchanger, whereinwhen the temperature of the feed air adjusted by at least the user-side heat exchanger is equal to or less than the target temperature of the feed air, the heat exchange capacity changing portion reduces the heat exchange capacity. 6. The refrigerant cycle device according to claim 5, wherein the heat exchange capacity changing portion includes a blower which blows the feed air toward the user-side heat exchanger and the bypass passage, andwhen the temperature of the feed air adjusted by at least the user-side heat exchanger is equal or less than the target temperature of the feed air, the blower decreases the volume of the feed air passing through each of the user-side heat exchanger and the bypass passage. 7. The refrigerant cycle device according to claim 5, wherein the heat exchange capacity changing portion includes an inside/outside air adjustment portion for changing a ratio of introduction of air inside the vehicle compartment to air outside the vehicle compartment into the casing,when the temperature of the feed air adjusted by at least the user-side heat exchanger is equal to or less than the target temperature of the feed air, the inside/outside air adjustment portion increases the ratio of introduction of the air inside the vehicle compartment to the air outside the vehicle compartment. 8. The refrigerant cycle device according to claim 1, wherein the flow rate adjustment portion includes a blower for blowing the feed air toward the user-side heat exchanger. 9. The refrigerant cycle device according to claim 2, wherein the controller controls the flow rate adjustment portion to decrease the flow rate of the fluid for heat exchange, after the high-pressure side decompressor increases the throttle opening degree. 10. The refrigerant cycle device according to claim 2, wherein the high-pressure side decompressor increases the throttle opening degree, after the controller controls the flow rate adjustment portion to decrease the flow rate of the fluid for heat exchange. 11. The refrigerant cycle device according to claim 6, wherein the controller includes a blower controller configured to control an operation of the blower, andwhen the temperature of the feed air adjusted by at least the user-side heat exchanger is equal to or less than the target temperature of the feed air, the blower controller is adapted to delay responsivity of the operation of the blower as compared to when the temperature of the feed air adjusted by the user-side heat exchanger is higher than the target temperature of the feed air. 12. The refrigerant cycle device according to claim 1, wherein the two-stage compression compressor includes a low-pressure side compression mechanism and a high-pressure side compression mechanism, the suction port is in direct fluid communication with an inlet of the low-pressure side compression mechanism, an outlet of the low-pressure side mechanism and the intermediate-pressure port are in direct fluid communication with an inlet of the high-pressure side compression mechanism. 13. The refrigerant cycle device according to claim 1, further comprising an intermediate-side opening/closing valve disposed between the gas-liquid separator and the intermediate-pressure port, the intermediate-side opening/closing valve is in communication with the controller. 14. A refrigerant cycle device, being applied to an air conditioner for a vehicle, comprising: a two-stage compression compressor configured to compress a low-pressure refrigerant sucked thereinto from a suction port and to discharge a high-pressure refrigerant from a discharge port, while allowing an intermediate-pressure refrigerant in a refrigerant cycle to flow thereinto to combine the intermediate-pressure refrigerant with the refrigerant under a compression stage via an intermediate-pressure port;a user-side heat exchanger configured to exchange heat between the high-pressure refrigerant discharged from the discharge port and a fluid for heat exchange to thereby heat the fluid for heat exchange;a second user-side heat exchanger configured to exchange heat between the refrigerant and the fluid for heat exchange to allow the refrigerant to flow toward the suction port; an outdoor heat exchanger configured to exchange heat between the refrigerant and an outside air;a first decompressor configured to decompress the refrigerant flowing from the first user-side heat exchanger;a second decompressor configured to decompress the refrigerant which is to flow into the outdoor heat exchanger;a third decompressor configured to decompress the refrigerant which is to flow into the second user-side heat exchanger;a gas-liquid separator configured to separate the refrigerant flowing from the first user-side heat exchanger into gas and liquid phases;an intermediate-pressure refrigerant passage for guiding the gas-phase refrigerant separated by the gas-liquid separator to the intermediate-pressure port, and mixing the gas-phase refrigerant with the refrigerant under a compression stage;an accumulator configured to separate the refrigerant flowing into the suction port of the two-stage compression compressor into gas and liquid phases, and causes the separated gas-phase refrigerant to flow to the suction port of the two-stage compression compressor;a flow rate adjustment portion which adjusts a flow rate of a fluid for heat exchange which is to flow into the user-side heat exchanger;a refrigerant flow path switching portion configured to switch between refrigerant flow paths through which the refrigerant circulates; anda controller configured to control the flow rate adjustment portion, whereinthe fluid for heat exchange is feed air blown into a vehicle compartment, the user-side heat exchanger is disposed in a casing forming therein an air passage for the feed air,in a cooling operation mode for cooling the fluid for heat exchange, the refrigerant flow path switching portion allows the refrigerant flowing from the first user-side heat exchanger to flow through the first decompressor, the gas-liquid separator, the outdoor heat exchanger, the third decompressor, the second user-side heat exchanger, and the accumulator in that order,in a heating operation mode for heating the fluid for heat exchange, the refrigerant flow path switching portion allows the refrigerant flowing from the first user-side heat exchanger to flow through the first decompressor, the gas-liquid separator, the second decompressor, the outdoor heat exchanger, and the accumulator in that order, while allowing the gas-phase refrigerant separated by the liquid-gas separator to flow into the intermediate-pressure refrigerant passage, andin the heating operation mode, the controller is configured to, when the controller determines that a temperature of the fluid for heat exchange adjusted by at least the user-side heat exchanger is equal to or less than the target temperature of the fluid for heat exchange and the controller determines that the number of revolutions of the two-stage compression compressor is equal to a maximum number of revolutions or the present valve opening of the first decompressor is equal to a maximum valve opening, the controller controls control the flow rate adjustment portion to decrease the flow rate of the fluid for heat exchange which is to flow into the user-side heat exchanger such that a refrigerant pressure within the user-side heat exchanger is increased, whereby a heat capacity in the refrigerant cycle is increased. 15. The refrigerant cycle device according to claim 14, wherein the two-stage compression compressor includes a low-pressure side compression mechanism and a high-pressure side compression mechanism, the suction port is in direct fluid communication with an inlet of the low-pressure side compression mechanism, an outlet of the low-pressure side mechanism and the intermediate-pressure port are in direct fluid communication with an inlet of the high-pressure side compression mechanism. 16. The refrigerant cycle device according to claim 14, further comprising an intermediate-side opening/closing valve disposed between the gas-liquid separator and the intermediate-pressure port, the intermediate-side opening/closing valve is in communication with the controller. 17. A method for controlling a refrigerant cycle device, being applied to an air conditioner for a vehicle, the refrigerant cycle device including: a two-stage compression compressor configured to compress a low-pressure refrigerant sucked from a suction port and to discharge a high-pressure refrigerant from a discharge port, while allowing an intermediate-pressure refrigerant in a refrigerant cycle to flow thereinto to combine the intermediate-pressure refrigerant with the refrigerant under a compression stage via an intermediate-pressure port;a user-side heat exchanger configured to exchange heat between the high-pressure refrigerant discharged from the discharge port and a fluid for heat exchange to thereby heat the fluid for heat exchange;a high-pressure side decompressor configured to decompress the high-pressure refrigerant flowing from the user-side heat exchanger into an intermediate-pressure refrigerant;a gas-liquid separator configured to separate the intermediate-pressure refrigerant decompressed by the high-pressure side decompressor into gas and liquid phases to flow out the separated gas-phase refrigerant toward the intermediate-pressure port;a low-pressure side decompressor configured to decompress the liquid-phase refrigerant separated by the gas-liquid separator into a low-pressure refrigerant;an evaporator configured to evaporate the low-pressure refrigerant decompressed by the low-pressure side decompressor and to flow out the refrigerant toward the suction port;a flow rate adjustment portion configured to adjust a flow rate of the fluid for heat exchange which is to flow into the user-side heat exchanger; anda controller configured to control the flow rate adjustment portion, whereinthe fluid for heat exchange is feed air blown into a vehicle compartment, the user-side heat exchanger is disposed in a casing forming therein an air passage for the feed air, the method comprising:controlling, by the controller, the flow rate adjustment portion to decrease the flow rate of the fluid for heat exchange which is to flow into the user-side heat exchanger such that a refrigerant pressure within the user-side heat exchanger is increased, when controller determines that a temperature of the fluid for heat exchange adjusted by at least the user-side heat exchanger is equal to or less than a target temperature of the fluid for heat exchange and the controller determines that the number of revolutions of the two-stage compression compressor is equal to a maximum number of revolutions or the present valve opening of the high-pressure side decompressor is equal to a maximum valve opening, whereby a heating capacity in the refrigerant cycle is increased. 18. The method according to claim 17, wherein the two-stage compression compressor includes a low-pressure side compression mechanism and a high-pressure side compression mechanism, the suction port is in direct fluid communication with an inlet of the low-pressure side compression mechanism, an outlet of the low-pressure side mechanism and the intermediate-pressure port are in direct fluid communication with an inlet of the high-pressure side compression mechanism. 19. The method according to claim 17, further comprising an intermediate-side opening/closing valve disposed between the gas-liquid separator and the intermediate-pressure port, the intermediate-side opening/closing valve is in communication with the controller.
Takashi Doi JP; Tsutomu Sakuma JP; Koji Kashima JP; Akihiro Noguchi JP, Two-evaporator refrigerator having a bypass and channel-switching means for refrigerant.
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