Refrigeration cycle device

Patent metadata

Field	Value
Publication number	US-12038207-B2
Application number	US-202117191487-A
Country	US
Kind code	B2
Filing date	Mar 3, 2021
Priority date	Sep 6, 2018
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

Abstract

The refrigeration cycle device includes a compressor, an outside heat exchanger, a cooling pressure reducing unit, an evaporator, a branch portion, a cool down pressure reducing unit, a temperature adjusting unit, a merging portion, a bypass passage, and a first on-off valve. The temperature adjusting unit includes a temperature adjusting heat exchange unit and adjusts a temperature of a temperature adjustment target object. During a cooling and cool down mode, the outside heat exchanger functions as a radiator, and the evaporator and the temperature adjusting heat exchange unit function as heat absorbers. During a target object warm up mode, the refrigerant discharged from the compressor is guided to the temperature adjusting heat exchange unit via the bypass passage, and the heat of the discharged refrigerant is used as a heat source for heating the temperature adjustment target object.

First claim

The invention claimed is:

1. A refrigerant cycle device, comprising: a compressor that compresses and discharges a refrigerant; an outside heat exchanger that exchanges heat between the refrigerant discharged from the compressor and outside air; a cooling pressure reducing unit that reduces a pressure of the refrigerant that flowed out of the outside heat exchanger; an evaporator that evaporates the refrigerant that flowed out of the cooling pressure reducing unit and absorbs heat from ventilation air which is to be blown into an air conditioning target space; a branch portion connected so that a portion of the refrigerant flowing out of the outside heat exchanger branches from the flow toward the cool pressure reducing unit; a cool down pressure reducing unit that pressure reduces the refrigerant branched at the branch portion; a temperature adjusting unit that includes a temperature adjusting heat exchange unit which exchanges heat with the refrigerant that flowed out from the cool down pressure reducing unit, the temperature adjusting unit being configured to adjust a temperature of a temperature adjustment target object using the refrigerant that passed through the temperature adjusting heat exchange unit as a heat source; a merging portion that merges the flow of the refrigerant flowing out of the evaporator and the flow of the refrigerant flowing out of the temperature adjusting unit and guides the merged flow to a suction port side of the compressor; a bypass passage that guides the refrigerant discharged from the compressor to an upstream side of the branch portion while bypassing the outside heat exchanger; a first on-off valve arranged in the bypass passage and configured to open and close the bypass passage; a heating unit including a condenser for dissipating heat from the refrigerant discharged from the compressor and heating the ventilation air using the discharged refrigerant as a heat source; a heating pressure reducing unit that reduces a pressure of the refrigerant flowing out of the heating unit and guides the refrigerant to an inlet side of the outside heat exchanger; a heating passage that guides the refrigerant flowing out of the outside heat exchanger to the suction port side of the compressor while bypassing the evaporator and the temperature adjusting unit; and a second on-off valve arranged in the heating passage and configured to open and close the heating passage, wherein during a cooling and cool down mode for cooling the ventilation air and the temperature adjustment target object, the outside heat exchanger functions as a radiator, and the evaporator and the temperature adjusting heat exchange unit function as heat absorbers, during a target object warm up mode for heating the temperature adjustment target object, the refrigerant discharged from the compressor is guided to the temperature adjusting heat exchange unit via the bypass passage, and the heat of the discharged refrigerant is used as the heat source for heating the temperature adjustment target object, during the target object warm up mode, a heat radiation amount of the discharged refrigerant in the condenser of the heating unit is adjusted to a lowest state the heating unit has a pump that pumps a high temperature side heat medium to the condenser, the refrigerant cycle device further comprises a controller that controls the pump, and the controller is configured to adjust the heat radiation amount of the discharged refrigerant in the condenser of the heating unit to the lowest state by stopping the operation of the pump during the target object warm up mode.

2. The refrigerant cycle device of claim 1 , wherein during the target object warm up mode, the heat radiation amount of the discharged refrigerant in the condenser of the heating unit is adjusted to be lower than that in a heating mode in which the ventilation air is heated by the heating unit and blown in to the air conditioning target space.

3. The refrigerant cycle device of claim 1 , wherein during a first heating and cool down mode in which the first on-off valve is closed, the heating pressure reducing unit and the cool down pressure reducing unit each exert a refrigerant pressure reducing effect, the heating unit heats the ventilation air, and the temperature adjustment target object is cooled at the temperature adjusting unit: a cool down priority mode is performed in which a ratio of a throttle opening degree of the heating pressure reducing unit to a throttle opening degree of the cool down pressure reducing unit is increased so that the outside heat exchanger functions as the radiator, and a heating priority mode is performed in which the ratio of the throttle opening degree of the heating pressure reducing unit to the throttle opening degree of the cool down pressure reducing unit is decreased so that the outside heat exchanger functions as a heat absorber.

4. The refrigerant cycle device of claim 1 , wherein
during a second heating and cool down mode in which the temperature adjustment target object is cooled at the temperature adjusting unit while the ventilation air is heated at the heating unit,
with the first on-off valve open, the refrigerant flowing out of the heating unit is guided to the bypass passage, and the cool down pressure reducing unit reduces the pressure of the refrigerant that passed through the bypass passage so that the temperature adjusting heat exchange unit functions as a heat absorber.

5. The refrigerant cycle device of claim 1 , wherein the condenser is a water-refrigerant heat exchanger that exchanges heat between the refrigerant discharged from the compressor and a high temperature side heat medium, the heating unit is configured at a high temperature side heat medium circuit in which the water-refrigerant heat exchanger is connected to a heater core that exchanges heat between the ventilation air and the high temperature side heat medium heated at the water-refrigerant heat exchanger, and when an operation condition for switching from the sole heating mode that heats the ventilation air at the heating unit to a heating and warm up mode that heats the ventilation air at the heating unit along with warming up the temperature adjustment target object by the temperature adjusting unit is satisfied, the temperature of the high temperature side heat medium is increased in advance.

6. The refrigerant cycle device of claim 1 , wherein
the temperature adjusting heat exchange unit is a chiller that exchanges heat between the refrigerant that flowed out of the cool down pressure reducing unit and a temperature adjustment side heat medium,
the temperature adjusting unit formed at a temperature adjustment side heat medium circuit in which the chiller is connected to a heat exchange unit that exchanges heat between the temperature adjustment target object and the temperature adjustment side heat medium which is temperature adjusted at the chiller, and
when an operation condition for switching from a sole warm up mode that warms up the temperature adjustment target object at the temperature adjusting unit to a heating and warm up mode that heats the ventilation air at the heating unit along with warming up the temperature adjustment target object by the temperature adjusting unit is satisfied, the temperature of the temperature adjustment side heat medium is increased in advance.

Assignees

• Denso Corp

Inventors

• Tada Kazuhiro
• Sugimura Kengo
• Kobayashi Hiroyuki
• Kami Yuichi
• Ito Satoshi

Classifications

• F25B41/20

  Disposition of valves, e.g. of on-off valves or flow control valves (expansion valves F25B41/31) · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• F25B25/005

  using primary and secondary systems · CPC title

• F25B2400/0411

  for expansion valves or capillary tubes · CPC title

• F25B2400/0409

  for evaporators · CPC title