Vehicle heat pump air-conditioning system

Patent metadata

Field	Value
Publication number	US-9707824-B2
Application number	US-201314386178-A
Country	US
Kind code	B2
Filing date	Mar 28, 2013
Priority date	May 25, 2012
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A vehicle heat pump air-conditioning system is provided, which is capable of securing a temperature linearity characteristic during dehumidifying heating, slowing progression of a frost formation on an exterior evaporator during heating, and stably continuing a heating operation while suppressing variations in a blowout temperature. In a cooling refrigeration cycle ( 14 ) becoming a base, an interior condenser ( 8 ) disposed in a HVAC unit ( 2 ) is connected to an exterior condenser ( 10 ) in parallel via switching means ( 15 ), an exterior evaporator ( 17 ) is connected to first decompression means ( 12 ) and an interior evaporator ( 7 ) in parallel via second decompression means ( 16 ), a heating heat pump cycle ( 18 ) is configured, the first decompression means ( 12 ) and the second decompression means ( 16 ) are on-off valve function attached decompression means ( 12, 16 ), and the exterior evaporator ( 17 ) and the interior evaporator ( 7 ) can be simultaneously used during dehumidifying heating and heating.

First claim

The invention claimed is:

1. A vehicle heat pump air-conditioning system comprising:
a cooling refrigeration cycle in which an electric compressor, an exterior condenser, a receiver, a first expansion valve, and an interior evaporator provided in a HVAC unit are connected to one another in this order;
an interior condenser which is disposed at the downstream side of the interior evaporator in the HVAC unit and in which a refrigerant inlet side of the interior condenser is connected to a discharge circuit of the electric compressor via a switching valve and a refrigerant outlet side of the interior condenser is connected to the receiver; and
an exterior evaporator in which a refrigerant inlet side of the exterior evaporator is connected to an outlet side of the receiver via a second expansion valve and a refrigerant outlet side of the exterior evaporator is connected to a suction circuit of the electric compressor,
wherein the electric compressor, the switching valve, the interior condenser, the receiver, the second expansion valve, and the exterior evaporator are connected to one another in this order, and a heating heat pump cycle is configured, and
wherein the exterior condenser, the exterior evaporator, and a radiator mounted on a vehicle side are provided in a ventilation path of a single fan, and the exterior evaporator is disposed at the rear stream sides of the exterior condenser and the radiator in the ventilation path.

2. The vehicle heat pump air-conditioning system according to claim 1 ,
wherein the first expansion valve and the second expansion valve are an electromagnetic valve attached temperature type automatic expansion valve or an electromagnetic expansion valve.

3. The vehicle heat pump air-conditioning system according to claim 1 ,
wherein the receiver is a check valve attached receiver in which each check valve is incorporated to a refrigerant inflow port of a refrigerant circuit from the exterior condenser and the interior condenser connected to the receiver.

4. The vehicle heat pump air-conditioning system according to claim 1 ,
wherein the exterior condenser and the radiator are vertically disposed, and the exterior evaporator is disposed at the rear stream sides of the exterior condenser and the radiator.

5. A vehicle heat pump air-conditioning system comprising:
a cooling refrigeration cycle in which an electric compressor, an exterior condenser, a receiver, a first expansion valve, and an interior evaporator provided in a HVAC unit are connected to one another in this order;
an interior condenser which is disposed at the downstream side of the interior evaporator in the HVAC unit and in which a refrigerant inlet side of the interior condenser is connected to a discharge circuit of the electric compressor via a switching valve and a refrigerant outlet side of the interior condenser is connected to the receiver; and
an exterior evaporator in which a refrigerant inlet side of the exterior evaporator is connected to an outlet side of the receiver via a second expansion valve and a refrigerant outlet side of the exterior evaporator is connected to a suction circuit of the electric compressor,
wherein the electric compressor, the switching valve, the interior condenser, the receiver, the second expansion valve, and the exterior evaporator are connected to one another in this order, and a heating heat pump cycle is configured, and
wherein the first and second expansion valves are configured with on-off valve functions, and
wherein the on-off valve function of the first expansion valve is opened when a predetermined temperature condition is satisfied, and the exterior evaporator and the interior evaporator is simultaneously used during dehumidifying heating and heating;
further comprising:
a first temperature sensor provided in the refrigerant outlet side of the exterior evaporator and configured to detect a refrigerant temperature;
a second temperature sensor configured to detect a blowout air from the interior evaporator or a fin temperature; and
a control system configured to control the on-off valve function of the first expansion valve,
wherein the control system opens, during a heating operation, the on-off valve function of the first expansion valve when the temperature detected by the first temperature sensor is less than or equal to a first set value, and a portion of the refrigerant is divided and flows to the interior evaporator via the first expansion valve, and closes the on-off valve function of the first expansion valve when the temperature detected by the second temperature sensor is less than or equal to a second set value, and the divided flow of the refrigerant to the interior evaporator via the first expansion valve is stopped.

6. A vehicle heat pump air-conditioning system comprising:
a cooling refrigeration cycle in which an electric compressor, an exterior condenser, a receiver, a first expansion valve, and an interior evaporator provided in a HVAC unit are connected to one another in this order;
an interior condenser which is disposed at the downstream side of the interior evaporator in the HVAC unit and in which a refrigerant inlet side of the interior condenser is connected to a discharge circuit of the electric compressor via a switching valve and a refrigerant outlet side of the interior condenser is connected to the receiver; and
an exterior evaporator in which a refrigerant inlet side of the exterior evaporator is connected to an outlet side of the receiver via a second expansion valve and a refrigerant outlet side of the exterior evaporator is connected to a suction circuit of the electric compressor,
wherein the electric compressor, the switching valve, the interior condenser, the receiver, the second expansion valve, and the exterior evaporator are connected to one another in this order, and a heating heat pump cycle is configured, and
wherein the first and second expansion valves are configured with on-off valve functions, and
wherein the on-off valve function of the first expansion valve is opened when a predetermined temperature condition is satisfied, and the exterior evaporator and the interior evaporator is simultaneously used during dehumidifying heating and heating;
further comprising:
a temperature sensor configured to detect a blowout air from the interior evaporator or a fin temperature; and
a control system configured to control the on-off valve function of the first expansion valve,
wherein the control system opens, during a dehumidifying heating operation, the on-off valve function of the first expansion valve when the temperature detected by the temperature sensor is equal to or more than a first set value, and a portion of the refrigerant is divided and flows to the interior evaporator via the first expansion valve, and closes the on-off valve function of the first expansion valve when the temperature detected by the temperature sensor is less than or equal to a second set value, and the divided flow of the refrigerant to the interior evaporator via the first expansion valve is stopped.

Assignees

• Mitsubishi Heavy Ind Automotive Thermal Sys Co Ltd
• Mitsubishi Heavy Ind Automotive Thermal Sys Co Ltd

Inventors

• Kondo Toshihisa
• Nakagawa Nobuya
• Katayama Akira
• Furuta Futoru
• Morishita Masatoshi
• Deguchi Shinji
• Ishihara Yasuo

Classifications

• B60H2001/00961

  comprising means for defrosting outside heat exchangers · CPC title

• B60H1/00385

  for vehicles having an electrical drive, e.g. hybrid or fuel cell · CPC title

• B60H1/3213

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

• B60H2001/00942

  comprising a plurality of heat exchangers, e.g. for multi zone heating or cooling · CPC title

• B60H1/00921 Primary

  where the flow direction of the refrigerant does not change and there is an extra subcondenser, e.g. in an air duct · CPC title