JPWO2021084743A5

JPWO2021084743A5 -

Info

Publication number: JPWO2021084743A5
Application number: JP2021554030A
Authority: JP
Filing date: 2019-11-01
Publication date: 2022-04-20

Description

圧力Ｐｄが基準圧力Ｐｒｅｆ以上である場合（Ｓ１０１においてＮＯ）、制御装置１０は、Ｓ１０２において通常運転の制御を行って処理をメインルーチンに返す。圧力Ｐｄが基準圧力Ｐｒｅｆより小さい場合（Ｓ１０１においてＹＥＳ）、制御装置１０は、Ｓ１０３において膨張弁７の開度を減少させて処理をＳ１０４に進める。 When the pressure Pd is equal to or higher than the reference pressure Ref (NO in S101), the control device 10 controls the normal operation in S102 and returns the process to the main routine. When the pressure Pd is smaller than the reference pressure Pref (YES in S101), the control device 10 reduces the opening degree of the expansion valve 7 in S103 and advances the process to S104.

Claims

A refrigeration cycle device in which the refrigerant circulates in the order of the compressor, the first heat exchanger, the second heat exchanger, the first expansion valve, and the third heat exchanger.
A receiver having a first port, a second port, and a third port located higher than the second port.
The second expansion valve connected to the second port and
A first flow path connecting the second expansion valve to the compressor via the second heat exchanger, and
A second flow path connecting the first heat exchanger to the second heat exchanger,
A vent pipe connecting the third port to the portion of the first flow path between the second expansion valve and the second heat exchanger.
A refrigeration cycle device including a third expansion valve connected between the second flow path and the first port.

The opening degree of the third expansion valve when the first pressure of the refrigerant discharged from the compressor is smaller than the reference pressure is the opening of the third expansion valve when the first pressure is larger than the reference pressure. Less than a degree ,
The reference pressure is a lower limit value of the first pressure that can be secured with the ratio of the first pressure to the second pressure of the refrigerant flowing between the compressor and the third heat exchanger as a target value . The refrigeration cycle apparatus according to claim 1.

When the first pressure is smaller than the reference pressure, the opening degree of the second expansion valve when the superheat degree of the refrigerant discharged from the compressor is larger than the reference value is such that the superheat degree is higher than the reference value. The refrigeration cycle apparatus according to claim 2, wherein the opening degree of the second expansion valve is larger than the opening degree when the pressure is small.

The first port and the third port are formed on the upper surface of the receiver.
The refrigerating cycle apparatus according to any one of claims 1 to 3, wherein the second port is formed on the bottom surface of the receiver facing the upper surface.

The compressor includes a discharge port, an suction port, and an injection port.
The refrigerant circulates in the order of the discharge port, the first heat exchanger, the second heat exchanger, the first expansion valve, the third heat exchanger, and the suction port.
The refrigeration cycle apparatus according to any one of claims 1 to 4, wherein the first flow path connects the second expansion valve to the injection port via the second heat exchanger.