Refrigeration cycle device and pilot on-off valve

#This application is a U.S. National Phase Application under 35 U.S.C. 371 of International Application No. PCT/JP2013/005166 filed on Sep. 2, 2013 and published in Japanese as WO 2014/054218 A1 on Apr. 10, 2014. This application is based on and claims the benefit of priority from Japanese Patent Application No. 2012-221014 filed on Oct. 3, 2012. The entire disclosures of all of the above applications are incorporated herein by reference.

#The present disclosure relates to a vapor compression type refrigeration cycle device and a pilot on-off valve that is applied to the vapor compression type refrigeration cycle device.

#Patent Document 1 has disclosed a pilot on-off valve functioning as a refrigerant circuit switching device that is applied to a vapor compression type refrigeration cycle device and switches a refrigerant circuit. In the pilot on-off valve of Patent Document 1, refrigerant pressure in a pilot space (a space to which refrigerant pressure biasing a main on-off valve in a valve closing direction is applied) is changed by the operation of a pilot valve, so that the main on-off valve is opened and closed.

#FIG. 1 is a schematic diagram showing a refrigerant circuit of a refrigeration cycle device according to a first embodiment of the present disclosure.

#FIG. 2 is a schematic sectional view showing a state in which a main on-off valve of a pilot on-off valve is closed, according to the first embodiment.

#FIG. 3 is a Mollier diagram showing a state of a refrigerant in a first dehumidification heating mode (first mode) of the refrigeration cycle device according to the first embodiment.

#Hereinafter, multiple embodiments for implementing the present invention will be described referring to drawings. In the respective embodiments, a part that corresponds to a matter described in a preceding embodiment may be assigned the same reference numeral, and redundant explanation for the part may be omitted. When only a part of a configuration is described in an embodiment, another preceding embodiment may be applied to the other parts of the configuration. The parts may be combined even if it is not explicitly described that the parts can be combined. The embodiments may be partially combined even if it is not explicitly described that the embodiments can be combined, provided there is no harm in the combination.

#A first embodiment of the present disclosure will be described with reference to FIGS. 1 to 11. In the present embodiment, a refrigeration cycle device 10 is applied to a vehicle air conditioning system 1 for a hybrid vehicle that obtains a drive force for the traveling of a vehicle from both an engine that is an internal combustion engine and an electric motor for the traveling of a vehicle. The refrigeration cycle device 10 functions to cool or heat air blown into the vehicle interior, which is an air-conditioning target space, in the vehicle air conditioning system 1.

#In addition, the refrigeration cycle device 10 is adapted to be capable of being switched to a refrigerant circuit for a cooling mode that cools the vehicle interior by cooling blown air, a refrigerant circuit for a heating mode that heats the vehicle interior by heating blown air, a refrigerant circuit for a first dehumidification heating mode that dehumidifies and heats the vehicle interior by reheating blown air having been dehumidified through cooling, or a refrigerant circuit for a second dehumidification heating mode that is performed when the temperature of outside air is at a very low temperature (for example, 0° C. or less) or the like and dehumidifies and heats the vehicle interior with increasing the heating capacity of blown air more than that of the first dehumidification heating mode.