JP2014202385A5

JP2014202385A5 -

Info

Publication number: JP2014202385A5
Application number: JP2013077051A
Authority: JP
Filing date: 2013-04-02
Publication date: 2015-09-10
Anticipated expiration: 2033-04-02

Description

本発明に係る冷凍サイクル装置は、圧縮機、四方弁、室外熱交換器、膨張弁及び室内熱交換器が順に冷媒配管により接続された冷媒回路と、圧縮機の外殻を構成するケースの温度を検出する温度センサーと、室内温度が設定温度になるように、圧縮機の容量を制御する制御装置とを備え、制御装置は、温度センサーにより検出されるケースの温度の変化から当該温度が予め設定された上限値を超えると予測したときに、そのケースの温度が上限値以下となるように、膨張弁の開度を制御する。 The refrigeration cycle apparatus according to the present invention includes a refrigerant circuit in which a compressor, a four-way valve, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are sequentially connected by a refrigerant pipe, and a temperature of a case constituting an outer shell of the compressor. And a control device that controls the capacity of the compressor so that the room temperature becomes a set temperature. The control device previously detects the temperature from a change in the temperature of the case detected by the temperature sensor. When it is predicted that the set upper limit value will be exceeded, the opening degree of the expansion valve is controlled so that the temperature of the case becomes equal to or lower than the upper limit value.

Claims

A refrigerant circuit in which a compressor, a four-way valve, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are sequentially connected by a refrigerant pipe;
A temperature sensor for detecting the temperature of the case constituting the outer shell of the compressor;
A control device for controlling the capacity of the compressor so that the room temperature becomes a set temperature;
When the control device predicts that the temperature exceeds a preset upper limit value from the change in temperature of the case detected by the temperature sensor, the temperature of the case becomes equal to or lower than the upper limit value. A refrigeration cycle apparatus that controls an opening degree of the expansion valve.

The expansion valve has a first expansion valve and a second expansion valve,
On the refrigerant pipe between the first expansion valve and the second expansion valve, a receiver is provided in which a first internal heat exchanger that connects the four-way valve and the compressor is installed.
The control device controls the opening degree of the first expansion valve or the second expansion valve according to cooling or heating operation when the temperature of the case is equal to or lower than the upper limit value. The refrigeration cycle apparatus according to claim 1.

A second internal heat exchanger provided on a refrigerant pipe between the outdoor heat exchanger and the receiver;
An injection circuit configured to branch from a refrigerant pipe between the receiver and the second internal heat exchanger and connected to the compressor via the second internal heat exchanger;
The control device controls the opening degree of the first expansion valve or the second expansion valve according to cooling or heating operation when the temperature of the case is equal to or lower than the upper limit value. The refrigeration cycle apparatus according to claim 2.

The said control apparatus controls the said opening degree so that it may become below the said upper limit by prediction according to the speed of the temperature rise per time from the temperature of the said case. The refrigeration cycle apparatus according to one item.

R32 is used for the refrigerant | coolant which circulates through the said refrigerant circuit, The refrigerating-cycle apparatus as described in any one of Claims 1-4 characterized by the above-mentioned.