refrigeration unit

Abstract

The present invention provides a refrigeration device in which a high-pressure side becomes a critical pressure, and the amount of circulating refrigerant in a refrigerant circuit can be appropriately maintained, thereby realizing stable cooling performance. The refrigerating device is equipped with: a refrigerant volume adjustment box (100) connected to the refrigerant circuit (1) and an additional refrigerant volume adjustment box (116); , to discharge the refrigerant recovered in each tank to the medium pressure area or low pressure side of the refrigerant circuit. The control means recovers the refrigerant to and discharges the refrigerant from the tanks, and adjusts the degree of recovering the refrigerant to and discharging the refrigerant from the tanks based on the high-pressure side pressure of the refrigerant circuit and the target high pressure, by Therefore, the amount of circulating refrigerant in the refrigerant circuit is controlled.

Description

technical field [0001] The present invention relates to a refrigeration apparatus in which a refrigerant circuit is constituted by a compression device, a gas cooler, an expansion device, and an evaporator, and the high-pressure side becomes a supercritical pressure. Background technique [0002] At present, in this kind of refrigeration device, a refrigeration cycle is formed by a compression device, a gas cooler, a throttling device, etc. The refrigerant compressed by the compression device dissipates heat through the gas cooler, and after being decompressed by the throttling device, passes through the evaporator. The refrigerant evaporates, and the ambient air is cooled by the evaporation of the refrigerant at this time. In recent years, in such refrigeration apparatuses, it is no longer possible to use Freon-based refrigerants due to environmental problems and the like. Therefore, as a substitute for Freon refrigerants, the use of carbon dioxide as a natural refrigerant...

AI Technical Summary

Problems solved by technology

[0009] In addition, the outlet temperature and pressure of the liquid pipes in the pipes connecting the refrigerator unit and each showcase change due to temperature changes or operating conditions caused by the seasons, so the amount of refrigerant in the liquid pipes varies greatly.

In addition, depending on the scale of the store, the length of the piping (construction piping length) connecting the refrigerator unit and each display case is also different, so it is difficult to specify an appropriate refrigerant charging amount

[0010] For this reason, if the high-pressure side pressure exceeds the recovery threshold, the refrigerant is recovered to the refrigerant quantity adjustment tank, and if it is lower than the discharge threshold, the refrigerant is discharged. The discharge of the refrigerant from the dose adjustment box is violent, so there are problems that the pressure on the high pressure side cannot be converged, and the cooling capacity fluctuates due to the fluctuation of the circulating refrigerant amount due to recovery and discharge, and stable cooling performance cannot be obtained.

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