Title:
REFRIGERATION UNIT
Document Type and Number:
Japanese Patent JP3178453
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To quickly stabilize the travel of an electronic expansion valve by making the control of the travel of the electronic expansion valve match the actual operating state with a simple method.
SOLUTION: When the operating condition of a refrigeration cycle is in a superheating range while the current temperature Td of a delivery pipe is estimated to tend downward from the previous memory data, or the operating condition of the refrigeration cycle is in a moisture range while the current degree Δ T of delivery superheating is estimated to tend upward from the previous data, the travel of an electronic expansion valve 3 is held at that immediately before it is determined by a PID control based on the preceding operating condition in the refrigeration cycle, thereby eliminating excessive opening or closing of the electronic expansion valve 3.
Inventors:
Masamu Hara
Daisuke Miyake
Shinichi Watanabe
Kunihide Wada
Kawakita Hiroyuki
Daisuke Miyake
Shinichi Watanabe
Kunihide Wada
Kawakita Hiroyuki
Application Number:
JP5042999A
Publication Date:
June 18, 2001
Filing Date:
February 26, 1999
Export Citation:
Assignee:
Daikin Industries, Ltd.
International Classes:
F25B1/00; (IPC1-7): F25B1/00
Domestic Patent References:
| JP3164658A | ||||
| JP5256525A |
Attorney, Agent or Firm:
Hiroshi Ohama