HEAT-PUMP AUTOMOTIVE AIR CONDITIONER AND DEFROSTING METHOD OF THE HEAT-PUMP AUTOMOTIVE AIR CONDITIONER

摘要

A refrigerant cycle (16) for cooling as a prototype is provided with: an internal condenser (8) connected to a discharge circuit of an electric compressor (9) and disposed on a downstream of an internal evaporator (7) of an HVAC unit (2); a first heating circuit (18) connected to a receiver (11) through a switching unit (17) arranged on an inlet side of the external condenser (8); and a second heating circuit (23) connected between an outlet side of the receiver (11) and a suction side of the electric compressor (9) and provided with a second expansion valve (20) and an external evaporator (21). A heat pump cycle (24) for heating is formed by a second heating circuit (23) including the electric compressor (9), the internal condenser (8), the switching unit (17), the first heating circuit (18), the receiver (11), the second expansion valve (20), and the external evaporator (21).

主权项

1. A heat-pump automotive air conditioner comprising:
a refrigerant cycle for cooling, to which an electric compressor, an external condenser, a receiver, a first expansion valve, and an internal evaporator arranged in an HVAC unit are connected in this order; an internal condenser connected to a discharge circuit of the electric compressor and disposed on a downstream of the internal evaporator in the HVAC unit; a first heating circuit connected to the receiver through a switching unit arranged on an inlet side of the external condenser; and a second heating circuit connected between an outlet of the receiver and a suction side of the electric compressor and provided with a second expansion valve and an external evaporator, wherein the electric compressor, the internal condenser, the switching unit, the first heating circuit, the receiver, and the second heating circuit having the second expansion valve and the external evaporator are capable of forming a heat pump cycle for heating, the heat-pump automotive air conditioner further comprising: a first refrigerant pipe configured to guide refrigerant from the external condenser to the receiver in the cooling operation; and a second refrigerant pipe that is different from the first refrigerant pipe and configured to guide the refrigerant from the internal condenser to the receiver in the heating operation, wherein the first refrigerant pipe is connected to the receiver through a first refrigerant inlet of the receiver, the second refrigerant pipe is connected to the receiver through a second refrigerant inlet of the receiver, and each of the first refrigerant inlet and the second refrigerant inlet is provided with a check valve.