Refrigeration apparatus

Patent metadata

Field	Value
Publication number	US-10145598-B2
Application number	US-201415109241-A
Country	US
Kind code	B2
Filing date	Mar 14, 2014
Priority date	Mar 14, 2014
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

A refrigeration apparatus includes a refrigerant circuit in which a compressor, a condenser, a liquid receiver, a first opening-and-closing valve, an expansion valve, and an evaporator are connected sequentially by pipes and through which refrigerant circulates. The refrigerant is HFO1123 or a refrigerant mixture containing HFO1123. A ratio of a refrigeration capacity to an opening area of the first opening-and-closing valve is within a range of 0.25 to 0.6 (kW/mm 2 ).

First claim

The invention claimed is:

1. A refrigeration apparatus comprising:
a refrigerant circuit in which a compressor, a condenser, a liquid receiver, a first opening-and-closing valve, an expansion valve, and an evaporator are connected sequentially by refrigerant-circuit pipes and through which refrigerant circulates;
a branch pipe branching from
a first pipe of the refrigerant-circuit pipes that connects the liquid receiver and the first opening-and-closing valve, and
a second pipe of the refrigerant-circuit pipes that connects the first opening-and-closing valve and the expansion valve; and

a second opening-and-closing valve having an opening area less than the opening area of the first opening-and-closing valve, and being provided to the branch pipe; and
a controller configured to
close the first opening-and-closing valve and the second opening-and-closing valve when a temperature in a cooling target space measured by a temperature sensor becomes lower than a predetermined value, and
open the second opening-and-closing valve first, and open the first opening-and-closing valve a predetermined time after the opening of the second opening-and-closing valve when the temperature in the cooling target space becomes higher than or equal to the predetermined value, wherein

the refrigerant being HFO1123 or a refrigerant mixture containing HFO1123,
the first opening-and-closing valve being configured to have an opening area such that a ratio of a refrigeration capacity of the refrigeration apparatus to the opening area is within a range of 0.25 to 0.6 (kW/mm 2 ).

2. The refrigeration apparatus of claim 1 , wherein the second pipe of the refrigerant-circuit pipes that connects the first opening-and-closing valve and the expansion valve has a non-zero length of 50 mm or less.

3. The refrigeration apparatus of claim 1 , wherein the first pipe of the refrigerant-circuit pipes that connects the liquid receiver and the first opening-and-closing valve is provided with a heater.

4. The refrigeration apparatus of claim 1 , wherein
the compressor is an inverter compressor, and
the controller is configured to start the inverter compressor at a frequency of 10 to 20 Hz and operate the inverter compressor while gradually increasing the frequency.

Assignees

• Mitsubishi Electric Corp
• Asahi Glass Co Ltd

Inventors

• Sugimoto Takeshi
• Saikusa Tetsuji

Classifications

• F25B2600/021

  Inverters therefor · CPC title

• F25B49/022

  Compressor control arrangements · CPC title

• F25B41/06

  Mechanical Engineering · mapped topic

• F25B2400/16

  Receivers · CPC title

• F25B2400/01

  Heaters · CPC title