CROSS REFERENCE TO RELATED APPLICATION

This application is a U.S. national stage application of International Application No. PCT/JP2016/051581, filed on Jan. 20, 2016, the contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to refrigeration cycle apparatuses, and more particularly to a refrigeration cycle apparatus enclosing a refrigerant having potential for disproportionation reaction.

BACKGROUND

WO 2012/157764 (PTD 1) discloses a heat cycle system employing a working medium for heat cycle containing HFO1123. PTD 1 discloses that the working medium for heat cycle containing HFO1123 is a working medium for heat cycle that has a low global warming potential (GWP) and is excellent in cycle performance (capacity).

PATENT DOCUMENT

PTD 1: WO 2012/157764

The heat cycle system described in PTD 1, however, is problematic in that it causes disproportionation reaction of a refrigerant under high temperature and high pressure. If, upon failure of a compressor, for example, the compressor is operated while a refrigerant circuit is closed due to a malfunction of a four-way valve or the like, or the compressor is operated with insufficient heat exchange due to a malfunction of a fan of an outdoor unit, or the compressor is operated while a pipe unit connected to the outdoor unit is closed, some of the refrigerant is placed under high temperature and high pressure in the above-described heat cycle system. As a result, disproportionation reaction of the refrigerant may occur in the above-described heat cycle system under the high temperature and high pressure.

SUMMARY

The present invention has been made to solve the problem as described above. A main object of the present invention is to provide a refrigeration cycle apparatus that suppresses disproportionation reaction of a refrigerant.

A refrigeration cycle apparatus according to the present invention is a refrigeration cycle apparatus in which a refrigerant having potential for disproportionation reaction circulates through a compressor, a condenser, an expansion valve and an evaporator in this order. The refrigeration cycle apparatus includes: a first refrigerant flow path connected between a discharge side of the compressor and the condenser; a second refrigerant flow path connected between the condenser and the expansion valve; a third refrigerant flow path connected between the expansion valve and a suction side of the compressor; a temperature measuring unit attached to one of the compressor and the first refrigerant flow path for measuring a temperature of the refrigerant; a pressure measuring unit attached to one of the compressor and the first refrigerant flow path for measuring a pressure of the refrigerant; and a jetting unit configured to jet the refrigerant drawn from the second refrigerant flow path or the third refrigerant flow path to at least one of the compressor, the first refrigerant flow path and the second refrigerant flow path when at least one of a measured value of the temperature measuring unit and a measured value of the pressure measuring unit exceeds an allowed value.

According to the present invention, a refrigeration cycle apparatus that suppresses disproportionation reaction of a refrigerant can be provided.

