Two-stage refrigeration apparatus

Two-stage refrigeration apparatus

A two-stage refrigeration apparatus 1 comprises: a low-stage side refrigeration cycle 10; a high-stage side refrigeration cycle 20; and a control device 30. The control device 30: reduces the rotational speed of a low-stage side motor 11b when the low-stage side suction pressure is lower than a firs...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: SUZUKI, KATSUYUKI, KANKI, EIJI, NAKAMURA, HAJIME, TSUBOI, NOBORU
Format: Patent
Sprache:chi ; eng
Schlagworte:
BLASTING
COMBINED HEATING AND REFRIGERATION SYSTEMS
HEAT PUMP SYSTEMS
HEATING
LIGHTING
LIQUEFACTION SOLIDIFICATION OF GASES
MANUFACTURE OR STORAGE OF ICE
MECHANICAL ENGINEERING
REFRIGERATION MACHINES, PLANTS OR SYSTEMS
REFRIGERATION OR COOLING
WEAPONS
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Beschreibung
Zusammenfassung:A two-stage refrigeration apparatus 1 comprises: a low-stage side refrigeration cycle 10; a high-stage side refrigeration cycle 20; and a control device 30. The control device 30: reduces the rotational speed of a low-stage side motor 11b when the low-stage side suction pressure is lower than a first lower limit pressure; increases the rotational speed of the low-stage side motor 11b when the low-stage side suction pressure exceeds a first upper limit pressure; and maintains the rotational speed of the low-stage side motor 11b and executes control in accordance with the following low-stage side differential pressure, when the low-stage side suction pressure is not less than the first lower limit and not more than the first upper limit pressure. That is, the rotational speed of a high-stage side motor 21a is reduced when the low-stage side differential pressure is lower than a second lower limit pressure, the rotational speed of the high-stage side motor 21a is increased when the low-stage side differential pr