US 2021/0197648 A1Published application

Heat pump system for vehicle air conditioning devices

AssigneeSanden Holdings Corporation

InventorNobutaka SHIMIZU

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Abstract

Provided is a vehicle air-conditioning apparatus heat pump system configured so that an excessive increase in the temperature (superheat degree) of refrigerant discharged from a compressor can be prevented in air-heating operation. The heat pump system (HP) includes a compressor (C) and an indoor heat exchanger (HXC2) on a refrigerant circuit (RC). A first branched flow path (BC1) on which a first expansion mechanism (EX1) of which opening degree is adjustable and a first heat absorption heat exchanger (HXA1) are arranged in series and a second branched flow path (BC2) on which a second expansion mechanism (EX2) of which opening degree is adjustable and a second heat absorption heat exchanger (HXA2) are arranged in series are arranged in parallel on the refrigerant circuit extending from the indoor heat exchanger to the compressor.

Claims4

Dependent claims

A vehicle air-conditioning apparatus heat pump system comprising:

a compressor and an indoor heat exchanger on a refrigerant circuit,
wherein a first branched flow path on which a first expansion mechanism of which opening degree is adjustable and a first heat absorption heat exchanger are arranged in series and
a second branched flow path on which a second expansion mechanism of which opening degree is adjustable and a second heat absorption heat exchanger are arranged in series
are arranged in parallel on the refrigerant circuit extending from the indoor heat exchanger to the compressor, and
during air-heating operation,
the opening degree of the first expansion mechanism is constantly set to higher than zero, and
the opening degree of the second expansion mechanism is set to higher than zero only in a case where a superheat degree of refrigerant sucked into the compressor or refrigerant discharged from the compressor reaches equal to or higher than an upper limit or a temperature of refrigerant discharged from the compressor reaches equal to or higher than an upper limit.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/269,708Filed 23 Aug 2019
Priority: JP 2018-16139730 Aug 2018
Published: 1 Jul 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification26 codes

B60H 1/22
Heating, cooling or ventilating devices: the heat source being other than the propulsion plant
B60H 1/00007
Heating, cooling or ventilating devices: combined heating, ventilating, or cooling devices
B60H 1/00278
HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit: for the battery
B60H 1/00328
Heat exchangers for air-conditioning devices: of the liquid-air type