JP2018021721A5

JP2018021721A5 -

Info

Publication number: JP2018021721A5
Application number: JP2016153753A
Authority: JP
Filing date: 2016-08-04
Publication date: 2019-04-18
Anticipated expiration: 2036-08-04

Description

上記課題を解決するために、本発明の冷凍装置及びその制御方法は以下の手段を採用する。
すなわち、本発明にかかる冷凍装置は、沸点が異なる低沸点冷媒と高沸点冷媒とが混合された非共沸混合冷媒を圧縮する圧縮機と、該圧縮機から導かれた非共沸混合冷媒を凝縮させる凝縮器と、該凝縮器から導かれた非共沸混合冷媒を膨張させる膨張弁と、該膨張弁から導かれた非共沸混合冷媒を蒸発させる蒸発器と、前記凝縮器と前記膨張弁との間から非共沸混合冷媒の一部を取り出す取出配管と、該取出配管に設けられた取出配管用開閉弁と、前記取出配管に接続され、非共沸混合冷媒を貯留して気液分離する気液分離器と、前記膨張弁と前記蒸発器との間と前記気液分離器内のガス相部とを接続し、前記気液分離器によって分離された非共沸混合冷媒のガス相を前記膨張弁と前記蒸発器との間へガス冷媒として戻すガス戻り配管と、該ガス戻り配管に設けられたガス戻り配管用開閉弁と、前記膨張弁と前記蒸発器との間と前記気液分離器内の液相部とを接続する液戻り配管と、前記液戻り配管に設けられた液戻り配管用開閉弁と、前記取出配管用開閉弁、前記ガス戻り配管用開閉弁および前記液戻り配管用開閉弁を制御する制御部とを備えていることを特徴とする。 In order to solve the above-mentioned subject, the freezing device and its control method of the present invention adopt the following means.
That is, the refrigeration apparatus according to the present invention comprises a compressor for compressing a non-azeotropic mixture refrigerant in which low boiling point refrigerants having different boiling points and high boiling point refrigerant are mixed, and a non-azeotropic mixture refrigerant led from the compressor. A condenser to be condensed, an expansion valve to expand the non-azeotropic mixed refrigerant led from the condenser, an evaporator to evaporate the non-azeotropic mixed refrigerant led from the expansion valve, the condenser and the expansion It is connected to a takeout pipe for taking out part of the non-azeotropic mixed refrigerant from between the valve and the take-out pipe on-off valve provided on the takeout pipe, and is connected to the takeout pipe to store the non-azeotropic mixed refrigerant. The non-azeotropic mixture refrigerant separated by the gas-liquid separator is connected by connecting the gas-liquid separator for liquid separation, between the expansion valve and the evaporator, and the gas phase part in the gas- liquid separator. a gas return pipe returning the gas refrigerant into between the gas phase and the expansion valve and the evaporator, said A gas return pipe on-off valve provided in the gas return pipe, a liquid return pipe for connecting between the expansion valve and the evaporator, and a liquid phase portion in the gas-liquid separator, the liquid return pipe It is characterized in that it is provided with a liquid return piping on-off valve, a control valve for controlling the outlet piping on-off valve, the gas return piping on-off valve, and the liquid return piping on-off valve.

また、本発明の冷凍装置の制御方法は、沸点が異なる低沸点冷媒と高沸点冷媒とが混合された非共沸混合冷媒を圧縮する圧縮機と、該圧縮機から導かれた非共沸混合冷媒を凝縮させる凝縮器と、該凝縮器から導かれた非共沸混合冷媒を膨張させる膨張弁と、該膨張弁から導かれた非共沸混合冷媒を蒸発させる蒸発器と、前記凝縮器と前記膨張弁との間から非共沸混合冷媒の一部を取り出す取出配管と、該取出配管に設けられた取出配管用開閉弁と、前記取出配管に接続され、非共沸混合冷媒を貯留して気液分離する気液分離器と、前記膨張弁と前記蒸発器との間と前記気液分離器内のガス相部とを接続し、前記気液分離器によって分離された非共沸混合冷媒のガス相を前記膨張弁と前記蒸発器との間へガス冷媒として戻すガス戻り配管と、該ガス戻り配管に設けられたガス戻り配管用開閉弁と、前記膨張弁と前記蒸発器との間と前記気液分離器内の液相部とを接続する液戻り配管と、前記液戻り配管に設けられた液戻り配管用開閉弁とを備えた冷凍装置の制御方法であって、前記取出配管用開閉弁、前記ガス戻り配管用開閉弁および前記液戻り配管用開閉弁の開閉制御を行うことを特徴とする。 Further, according to the control method of the refrigeration apparatus of the present invention, there is provided a compressor for compressing a non-azeotropic mixture refrigerant in which low boiling point refrigerants having different boiling points and high boiling point refrigerant are mixed, and non-azeotropic mixture introduced from the compressor A condenser for condensing the refrigerant, an expansion valve for expanding the non-azeotropic mixed refrigerant led from the condenser, an evaporator for evaporating the non-azeotropic mixed refrigerant led from the expansion valve, the condenser It is connected to a takeout pipe for taking out part of the non-azeotropic mixed refrigerant from between the expansion valve, a takeout pipe on-off valve provided on the takeout pipe, and the takeout pipe to store the non-azeotropic mixed refrigerant. Non-azeotropic mixing separated by the gas-liquid separator by connecting the gas-liquid separator for separating the gas-liquid and the gas phase portion in the gas-liquid separator between the expansion valve and the evaporator a gas return pipe returning the gas refrigerant into between the gas phase of the refrigerant and the expansion valve and the evaporator, said A gas return pipe on-off valve provided in the gas return pipe, a liquid return pipe for connecting between the expansion valve and the evaporator, and a liquid phase portion in the gas-liquid separator, the liquid return pipe A control method of a refrigerating apparatus including a liquid return piping on-off valve, wherein the on-off valve for the outlet piping, the on-off valve for the gas return piping, and the on-off valve for the liquid return piping are controlled. It is characterized by

Claims

A compressor for compressing a non-azeotropic refrigerant mixture in which low-boiling refrigerants and high-boiling refrigerants having different boiling points are mixed;
A condenser for condensing the non-azeotropic mixed refrigerant introduced from the compressor;
An expansion valve for expanding the non-azeotropic mixed refrigerant introduced from the condenser;
An evaporator for evaporating the non-azeotropic mixed refrigerant introduced from the expansion valve;
An extraction pipe for extracting a part of the non-azeotropic refrigerant mixture from between the condenser and the expansion valve;
A release piping on-off valve provided in the removal piping;
A gas-liquid separator connected to the take-out pipe for storing non-azeotropic mixed refrigerant for gas-liquid separation;
The expansion valve and the evaporator are connected to the gas phase portion in the gas-liquid separator, and the gas phase of the non-azeotropic mixture refrigerant separated by the gas-liquid separator is expanded with the expansion valve and the evaporation Gas return piping, which returns it as a gas refrigerant to the
A gas return piping on-off valve provided in the gas return piping;
A liquid return pipe that connects between the expansion valve and the evaporator and a liquid phase portion in the gas-liquid separator;
A liquid return piping on-off valve provided in the liquid return piping;
A control unit that controls the open / close valve for the extraction pipe, the open / close valve for the gas return pipe, and the open / close valve for the liquid return pipe;
A refrigeration apparatus comprising:

The control unit opens the on-off valve for the extraction pipe and opens the on-off valve for the gas return pipe when the outside air temperature is lower than a predetermined value or the temperature of the evaporator is lower than the predetermined value during heating operation. The refrigeration apparatus according to claim 1, wherein a separation operation is performed to return the gas refrigerant separated by the gas-liquid separator from the gas return pipe to the evaporator side.

The control unit closes the on-off valve for the extraction pipe after a predetermined period has elapsed since the start of the separation operation, or after the degree of superheat of the non-azeotropic mixed refrigerant sucked by the compressor becomes less than a predetermined value. The refrigerating apparatus according to claim 2, wherein:

When the outside air temperature is equal to or higher than a predetermined value or the temperature of the discharge gas discharged from the compressor is equal to or higher than a predetermined value, the control unit opens the on-off valve for the extraction pipe and opens the on-off valve for gas return pipe The refrigeration apparatus according to claim 2, wherein the refrigeration system is closed and the liquid return piping on-off valve is opened.

The refrigeration apparatus according to claim 1, wherein the control unit opens the on-off valve for the extraction pipe and opens the on-off valve for the gas return pipe during the cooling operation.

When the temperature of the discharge gas discharged from the compressor reaches a predetermined value or more, the control unit opens the on-off valve for the extraction pipe and closes the on-off valve for the gas return pipe, and the liquid return pipe The refrigeration apparatus according to claim 4, wherein the on-off valve is opened.

A compressor for compressing a non-azeotropic refrigerant mixture in which low-boiling refrigerants and high-boiling refrigerants having different boiling points are mixed;
A condenser for condensing the non-azeotropic mixed refrigerant introduced from the compressor;
An expansion valve for expanding the non-azeotropic mixed refrigerant introduced from the condenser;
An evaporator for evaporating the non-azeotropic mixed refrigerant introduced from the expansion valve;
An extraction pipe for extracting a part of the non-azeotropic refrigerant mixture from between the condenser and the expansion valve;
A release piping on-off valve provided in the removal piping;
A gas-liquid separator connected to the take-out pipe for storing non-azeotropic mixed refrigerant for gas-liquid separation;
The expansion valve and the evaporator are connected to the gas phase portion in the gas-liquid separator, and the gas phase of the non-azeotropic mixture refrigerant separated by the gas-liquid separator is expanded with the expansion valve and the evaporation Gas return piping, which returns it as a gas refrigerant to the
A gas return piping on-off valve provided in the gas return piping;
A liquid return pipe that connects between the expansion valve and the evaporator and a liquid phase portion in the gas-liquid separator;
A liquid return piping on-off valve provided in the liquid return piping;
A control method of a refrigeration system provided with
A control method of a refrigeration system characterized by performing opening and closing control of the outlet piping on-off valve, the gas return piping on-off valve, and the liquid return piping on-off valve.