Title:
CAPACITY CONTROL METHOD FOR TWO-STAGE COMPRESSION REFRIGERATING DEVICE AND DEVICE THEREFOR
Document Type and Number:
Japanese Patent JP2541741
Kind Code:
B2
Abstract:
PURPOSE: To simplify the temperature control and save the energy by providing a gas cooler between the low-stage delivery gas pipe and the high-stage intake gas pipe of a two-stage compressor having an economizer used in a constant- temperature device such as a semiconductor environmental tester.
CONSTITUTION: A two-stage compression refrigerating device 3 having an economizer provided with a gas cooler 23 between a low-stage delivery gas pipe 13 and a high-stage intake gas pipe 14 is provided with a temperature sensor 6 and a temperature controller 7 at the cooled liquid outlet 5a of an evaporator 5, an expansion valve 19 and a liquid feed valve 25 to the economizer and the gas cooler 23 on branch liquid pipes 18, 24 at the outlet of a condenser 17, signal lines 26, 27 connecting the expansion valve 19 and the liquid feed valve 25 to the temperature controller 7, and an automatic valve 10 connecting a signal line between the branch gas pipe 9 of the gas cooler 23 and the temperature controller 7 respectively. The liquid feed to the economizer is stopped by the set temperature signal of the temperature controller 7, the liquid feed to the gas cooler 23 is started, and the low-stage delivery gas pressure and the high-stage intake gas pressure of the two-stage compressor are made equal.
Inventors:
NAKAYAMA TETSURO
Application Number:
JP500593A
Publication Date:
October 09, 1996
Filing Date:
January 14, 1993
Export Citation:
Assignee:
NISSHIN KOGYO KK
International Classes:
F04B49/06; F04D27/00; F25B1/10; (IPC1-7): F04B49/06; F25B1/10
Domestic Patent References:
| JP576267A | ||||
| JP6419870U |
Attorney, Agent or Firm:
Akiyama Hoomi (2 outside)