Air conditioning device for vehicle

Patent metadata

Field	Value
Publication number	US-2016178253-A1
Application number	US-201414907836-A
Country	US
Kind code	A1
Filing date	Jul 15, 2014
Priority date	Jul 31, 2013
Publication date	Jun 23, 2016
Grant date	—

Abstract

An air conditioning device for a vehicle has a compressor that supplies a high-pressure refrigerant by drawing and discharging a refrigerant, an air heating heat exchanger heating air that is to be blown into a vehicle cabin by using heat of the high-pressure refrigerant, a pressure reduction part expanding and decompressing the high-pressure refrigerant and supplying as an intermediate-pressure refrigerant and a low-pressure refrigerant, a first low-pressure side heat exchanger exchanging heat between the intermediate-pressure refrigerant and a heating medium other than the air, a second low-pressure side heat exchanger cooling the heating medium by exchanging heat between the low-pressure refrigerant and the heating medium, a first heating medium circuit through which the heating medium cooled in the second low-pressure side heat exchanger circulates, and a heating medium-air heat exchanger causing the heating medium to absorb heat by exchanging heat between the air and the heating medium circulating through the first heating medium circuit. The heating medium heated in the high-pressure side heat exchanger is capable of being introduced to the first low-pressure side heat exchanger.

First claim

What is claimed is:

1 . An air conditioning device for a vehicle comprising:
a compressor that supplies a high-pressure refrigerant by drawing and discharging a refrigerant; an air heating heat exchanger heating air that is to be blown into a vehicle cabin by using heat of the high-pressure refrigerant; a pressure reduction part expanding and decompressing the high-pressure refrigerant and supplying as an intermediate-pressure refrigerant and a low-pressure refrigerant; a first low-pressure side heat exchanger exchanging heat between the intermediate-pressure refrigerant and a heating medium other than the air; a second low-pressure side heat exchanger cooling the heating medium by exchanging heat between the low-pressure refrigerant and the heating medium; a first heating medium circuit through which the heating medium cooled in the second low-pressure side heat exchanger circulates; and a heating medium-air heat exchanger causing the heating medium to absorb heat by exchanging heat between the air and the heating medium circulating through the first heating medium circuit.

2 . The air conditioning device for a vehicle according to claim 1 further comprising:
a high-pressure side heat exchanger heating the heating medium by exchanging heat between the high-pressure refrigerant and the heating medium; and
a second heating medium circuit through which the heating medium heated in the high-pressure side heat exchanger circulates, wherein
the first low-pressure side heat exchanger is connected to at least one of the first heating medium circuit and the second heating medium circuit in a heating.

3 . The air conditioning device for a vehicle according to claim 2 further comprising
an introduced heat quantity adjustment part increasing a heat quantity that is introduced from the second heating medium circuit to the first low-pressure side heat exchanger in conjunction with an increase in a heating load, wherein
the first low-pressure side heat exchanger is connected to the second heating medium circuit.

4 . The air conditioning device for a vehicle according to claim 2 further comprising
a switching part switching a connection destination of the first low-pressure side heat exchanger from the first heating medium circuit to the second heating medium circuit in conjunction with the increase in the heating load in the heating.

5 . The air conditioning device for a vehicle according to claim 1 , wherein
the first low-pressure side heat exchanger is connected to the first heating medium circuit in a cooling.

6 . The air conditioning device for a vehicle according to claim 1 , wherein
the pressure reduction part has an ejector, the ejector draws the refrigerant as a suction refrigerant from a refrigerant suction port by a suction action of a high-speed injection refrigerant that is injected from a nozzle portion reducing the pressure of the refrigerant, and boosts pressure of a mixed refrigerant of the injection refrigerant and the suction refrigerant in a pressure boosting portion, the intermediate-pressure refrigerant is the refrigerant of which pressure is after being boosted in the pressure boosting portion, and the low-pressure refrigerant is the suction refrigerant.

7 . The air conditioning device for a vehicle according to claim 1 , wherein
the pressure reduction part has an expansion valve expanding and decompressing the refrigerant and an ejector, the ejector draws the refrigerant as a suction refrigerant from a refrigerant suction port by a suction action of a high-speed injection refrigerant that is injected from a nozzle portion reducing the pressure of the refrigerant, which is after decompressed in the expansion valve, and boosts pressure of a mixed refrigerant of the injection refrigerant and the suction refrigerant in a pressure boosting portion, the intermediate-pressure refrigerant is the refrigerant that is after decompressed in the expansion valve, and the low-pressure refrigerant is the suction refrigerant.

8 . The air conditioning device for a vehicle according to claim 1 further comprising
a device heating the heating medium that flows into the first low-pressure side heat exchanger.

9 . The vehicular heat exchanger according to claim 8 , wherein
the device is a heat generating device that generates heat when being operated.

10 . The air conditioning device for a vehicle according to claim 8 , wherein
the device is a ventilation heat-recovery heat exchanger recovering heat from air that is discharged from the inside of the vehicle cabin to the outside of the vehicle cabin for ventilation.

11 . An air conditioning device for a vehicle comprising:
a second heating medium circuit through which a heating medium circulates; a compressor drawing and discharging a refrigerant; a high-pressure side heat exchanger heating the heating medium by exchanging heat between the refrigerant that is discharged by the compressor and the heating medium that circulates through the second heating medium circuit; an air heating heat exchanger heating air that is to be blown into a vehicle cabin by exchanging heat between the heating medium heated in the high-pressure side heat exchanger and the air that is to be blown into the vehicle cabin; a pressure reduction part expanding and decompressing the refrigerant that is after exchanging heat in the high-pressure side heat exchanger; and a first low-pressure side heat exchanger exchanging heat between the heating medium and the refrigerant that is expanded and decompressed in the pressure reduction part, wherein the heating medium heated in the high-pressure side heat exchanger is capable of being introduced to the first low-pressure side heat exchanger.

12 . The air conditioning device for a vehicle according to claim 11 further comprising:
a first heating medium circuit through which heating medium circulates;
a second low-pressure side heat exchanger cooling the heating medium by exchanging heat between the refrigerant that is after being expanded and decompressed in the pressure reduction part and the heating medium that circulates through the first heating medium circuit; and
a heating medium—outside air heat exchanger causing the heating medium to absorb heat by exchanging heat between the outside air and the heating medium that is after being cooled in the second low-pressure side heat exchanger.

13 . The air conditioning device for a vehicle according to claim 12 further comprising:
an air cooling heat exchanger cooling the air that is to be blown into the vehicle cabin by exchanging heat between the heating medium that is after being cooled in the second low-pressure side heat exchanger and the air that is to be blown into the vehicle cabin; and
a switching part, wherein
the switching part switches between a heating mode in which the heating medium cooled in the second low-pressure side heat exchanger flows into the heating medium—outside air heat exchanger and a cooling mode in which the heating medium heated in the high-pressure side heat exchanger flows into the heating medium—outside air heat exchanger, and
in the cooling mode, the switching part reduces a heat quantity that is introduced from the heating medium heated in the high-pressure side heat exchanger into the refrigerant flowing into the first low-pressure side heat exchanger as compared with in the heating mode.

14 . The air conditioning device for a vehicle according to claim 12 further comprising
a device of which heat is absorbed by the heating medium circulating through the first heating medium circuit.

15

Assignees

• Denso Corp

Inventors

• Katoh Yoshiki
• Makihara Masamichi
• Kuwayama Kazutoshi
• Enomoto Norihiko
• Sugimura Kengo

Classifications

• B60H2001/3298

  Ejector-type refrigerant circuits · CPC title

• F25B25/005 Primary

  using primary and secondary systems · CPC title

• F25B2339/047

  Water-cooled condensers · CPC title

• F25B41/00

  Fluid-circulation arrangements · CPC title

• B60H1/00278

  for the battery · CPC title