FREEZING APPARATUS - DAIKIN IND LTD

Title:

FREEZING APPARATUS

Document Type and Number:

WIPO Patent Application WO/2005/019742

Kind Code:

A1

Abstract:

A freezing apparatus where a portion of a refrigerant flowing in a main refrigerant circuit is bypassed so as to be returned to the suction side of a compressor and the refrigerant flowing in the main refrigerant circuit can be set in a supercooled state by using the bypassed refrigerant, wherein the degree of supercooling of the refrigerant flowing in the main refrigerant circuit is increased. An air conditioner (1) has a main refrigerant circuit (10); a temperature sensor (Td) for detecting a discharge temperature of a compressor (21); a bypass refrigerant circuit (41) bifurcating a portion of the refrigerant flowing in the main refrigerant circuit (10) from the main refrigerant circuit (10) and returning the portion to the suction side of the compressor (21); an expansion valve (42) for bypassing, regulating a flow rate of the refrigerant flowing in the bypass refrigerant circuit (41); a cooler (27) for cooling the refrigerant flowing in the main refrigerant circuit (10) by using the refrigerant flowing in the bypass refrigerant circuit (41); a temperature sensor (Tsh) for detecting the degree of superheating of the refrigerant at a cooler (27) exit; and a control section (60) for controlling the expansion valve (42) based on the degree of superheating detected by the temperature sensor (Tsh) so that the degree of superheating of the refrigerant flowing in the bypass refrigerant circuit (41) is a predetermined value. The predetermined value is set based on the discharge temperature detected by the temperature sensor (Td) to a value that does not cause wet operation of the compressor (21).

Inventors:

TAKECHI RYOTA (JP)
MATSUOKA SHINYA (JP)
HORI YASUSHI (JP)
OKA MASAHIRO (JP)

Application Number:

PCT/JP2004/012064

Publication Date:

March 03, 2005

Filing Date:

August 23, 2004

Export Citation:

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Assignee:

DAIKIN IND LTD (JP)
TAKECHI RYOTA (JP)
MATSUOKA SHINYA (JP)
HORI YASUSHI (JP)
OKA MASAHIRO (JP)

International Classes:

F25B1/00; F25B13/00; F28D7/10; (IPC1-7): F25B1/00

Foreign References:

JPH06265232A	1994-09-20
JP2000018737A	2000-01-18

Other References: