Air conditioning device for vehicle

Patent metadata

Field	Value
Publication number	US-10059170-B2
Application number	US-201615332075-A
Country	US
Kind code	B2
Filing date	Oct 24, 2016
Priority date	Apr 25, 2014
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

An air conditioning device for vehicle includes a first water-refrigerant heat exchanger, a second water-refrigerant heat exchanger, a first bypass passage, and a second bypass passage. The first bypass passage branches at a point of a coolant passage from a cooling portion of a heating component in the vehicle to the second water-refrigerant heat exchanger, and the first bypass passage is capable of being communicated with the coolant passage at an upstream side of the first water-refrigerant heat exchanger. The second bypass passage bran at a point of the coolant passage from a heater core to the first water-refrigerant heat exchanger, and the second bypass passage is capable of being communicated with the coolant passage at a downstream side of the first water-refrigerant heat exchanger. A part of the first bypass passage which includes a downstream end and a part of the second bypass passage which includes an upstream end are shared.

First claim

What is claimed is:

1. An air conditioning device for a vehicle, the air conditioning device comprising:
a compressor that compresses a refrigerant;
a heater core that heats air to be sent into a vehicle interior;
a first water-refrigerant heat exchanger that exchanges heat between the refrigerant of low-temperature and low-pressure and a coolant for heat transport to vaporize the refrigerant of low-temperature and low-pressure;
a second water-refrigerant heat exchanger that exchanges heat between the refrigerant of high-temperature and high-pressure discharged from the compressor and the coolant to condense the refrigerant of high-temperature and high-pressure, and provides the heated coolant to the heater core;
a first conduit having a first end and a second end;
a second conduit having a first end and a second end,
the second end of the first conduit connected to the first end of the second conduit to define a first bypass passage,
the first end of the first conduit branching from a first inlet conduit fluidly connected to an inlet port of the first water-refrigerant heat exchanger and the second end of the second conduit branching from a second inlet conduit fluidly connected to an inlet port of the second water-refrigerant heat exchanger wherein fluid flowing along the first bypass passage bypasses the second water-refrigerant heat exchanger and the heater core; and

a third conduit having a first end and a second end,
the second end of the first conduit connected to the first end of the third conduit to define a second bypass passage,
the second end of the third conduit branching from an outlet conduit fluidly connected to an outlet port of the first water-refrigerant heat exchanger wherein fluid flowing along the second bypass passage bypasses the first water-refrigerant heat exchanger.

2. The air conditioning device for a vehicle according to claim 1 , the air conditioning device further comprising a selector,
wherein:
the part shared by the first bypass passage and the second bypass passage is defined as a shared passage, a part of the first bypass passage excluding the shared passage is defined as a first branch passage, and a part of the second bypass passage excluding the shared passage is defined as a second branch passage, and
the selector is formed into one unit and switches to one of three communication states in which the first branch passage, the second branch passage, and the shared passage communicate, the three communication states being a state of blocking all passages, a state of allowing only communication between the first branch passage and the shared passage, and a state of allowing only communication between the second branch passage and the shared passage.

3. The air conditioning device for a vehicle according to claim 1 , the air conditioning device further comprising a controller that performs a control to allow the coolant to divert to the first bypass passage or the second bypass passage, based on a parameter indicating a driving condition of the air conditioning device for the vehicle,
wherein:
the controller switches to a state in which a bypass by the second bypass passage is set from a state in which neither a bypass by the first bypass passage nor the bypass by the second bypass passage is set, when the parameter exceeds an upper threshold, and
the controller switches to a state in which the bypass by the first bypass passage is set from a state in which neither the bypass by the first bypass passage nor the bypass by the second bypass passage is set, when the parameter falls below a lower threshold that is lower than the upper threshold.

4. The air conditioning device for a vehicle according to claim 3 , wherein:
the controller switches to the state in which neither the bypass by the first bypass passage nor the bypass by the second bypass passage is set, when the parameter falls below a middle-lower threshold that is set to be equal to or lower than the upper threshold with the state in which the bypass by the second bypass passage is set, and
the controller switches to the state in which neither the bypass by the first bypass passage nor the bypass by the second bypass passage is set, when the parameter exceeds a middle-upper threshold that is set to be equal to or higher than the lower threshold with the state in which the bypass by the first bypass passage is set.

5. The air conditioning device for a vehicle according to claim 4 , wherein
the upper threshold, the middle-upper threshold, the middle-lower threshold, and the lower threshold are set to be decreased in this order in a stepwise manner.

6. The air conditioning device for a vehicle according to claim 3 , wherein
the parameter is a refrigerant pressure or a coolant temperature.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Kodera Yuji
• Kuroda Kentaro
• Taniguchi Katsuji
• Noda Yoshitoshi

Classifications

• B60H2001/00949

  comprising additional heating/cooling sources, e.g. second evaporator · CPC title

• B60H1/3213

  for increasing the efficiency in a vehicle heat pump · CPC title

• B60H1/02

  the heat being derived from the propulsion plant · CPC title

• B60H1/00899 Primary

  Controlling the flow of liquid in a heat pump system (controlling the properties of the refrigerant liquid, e.g. pressure or temperature, B60H1/3204) · CPC title

• B60H2001/3257

  of the refrigerant at a compressing unit · CPC title