Title:
FREEZING APPARATUS
Document Type and Number:
Japanese Patent JP2023150385
Kind Code:
A
Abstract:
To improve detection accuracy of a gas refrigerant flowing in an oil return pipe connected to an oil separator in a freezing apparatus.SOLUTION: A compressor unit (20) of a refrigerant circuit (15) comprises a compressor (30), an oil separator (40), an oil returning pipe (45), an oil returning valve (46), and a discharge temperature sensor (50). A freezing apparatus (10) comprises a controller (60). The controller (60) performs a detection operation. The detection operation is an operation for reducing an opening of the oil returning valve (46), and detecting that a gas refrigerant is flowing in the oil returning pipe (45) on the basis of change of a measurement value of the discharge temperature sensor (50) after the opening of the oil returning valve (46) is reduced, with respect to the measurement value of the discharge temperature sensor (50) before the opening of the oil returning valve (46) is reduced.SELECTED DRAWING: Figure 1
Inventors:
KABASHIMA NOBUTAKA
Application Number:
JP2022059480A
Publication Date:
October 16, 2023
Filing Date:
March 31, 2022
Export Citation:
Assignee:
DAIKIN IND LTD
International Classes:
F25B49/02; F24F11/89; F25B1/00
Domestic Patent References:
| JP2006214602A | 2006-08-17 | |||
| JP2006207917A | 2006-08-10 | |||
| JP2011153784A | 2011-08-11 |
Foreign References:
| WO2020241622A1 | 2020-12-03 |
Attorney, Agent or Firm:
Patent Attorney Corporation Maeda Patent Office