Air conditioning apparatus

摘要

An air conditioning apparatus includes a refrigeration circuit, a magnetic material member, a magnetic field generator, a detector and a controller. The refrigeration cycle has a compressor, an intake-side heat exchanger, a discharge-side heat exchanger, an expansion valve, and a refrigerant tube connected in series by first, second, third and fourth tube parts of the refrigerant tube to form a closed loop. The magnetic field generator generates a magnetic field in order to inductively heat the magnetic material member. The detector detects temperature or pressure in refrigerant flowing through a predetermined portion of the refrigerant circuit. The controller confirms satisfaction of a magnetic-field-generating-permission condition before initiating the magnetic field generator to generate the magnetic field after a startup of the compressor. The magnetic-field-generating-permission condition is that a value detected by the detector changes when the compressor executes two different compression states of different compressor outputs having different frequencies.

主权项

1. An air conditioning apparatus comprising:
a refrigerant circuit having
a compressor configured to circulate refrigerant, the compressor being capable of executing two different compression states of different compressor outputs, one being a first compression state and the other being a second compression state having a frequency higher than the frequency of the first compression state,an intake-side heat exchanger connected to an intake side of the compressor,a discharge-side heat exchanger connected to a discharge side of the compressor,an expansion valve configured and arranged to lower pressure of refrigerant flowing from the discharge-side heat exchanger to the intake-side heat exchanger, anda refrigerant tube including
a first refrigerant tube part connecting the compressor and the intake-side heat exchanger,a second refrigerant tube part connecting the compressor and the discharge-side heat exchanger,a third refrigerant tube part connecting the expansion valve and the intake-side heat exchanger, anda fourth refrigerant tube part connecting the expansion valve and the discharge-side heat exchanger,with elements of the refrigerant circuit being connected in series with the first, second, third and fourth refrigerant tube parts to form a closed loop; a magnetic material member arranged to make thermal contact with at least one of the refrigerant tube and a refrigerant flowing through the refrigerant tube; a magnetic field generator arranged to generate a magnetic field in order to inductively heat the magnetic material member; a detector arranged and configured to detect either
temperature orpressurein refrigerant flowing through a predetermined portion of the refrigerant circuit; and
a controller configured to initiate the magnetic field generator in response to determining that a value detected by the detector changes when the compressor changes from the second compression state to the first compression state or when the compressor changes from the first compression state to the second compression state.