To provide a screw refrigerating device simplified in structure and improved in refrigerating capacity.
The screw refrigerating device comprises a refrigerant circulating passage L1 including a screw compressor 11, a condenser 12, an economizer 13, a main expansion valve 14 and an evaporator 15; an economizer passage L3 reaching an inflow port 23a of a cooling jacket 23 of a motor 11c for driving the screw compressor 11, from a supercooling passage L2 in the economizer 13 for heat-exchanging a refrigerant separated from the circulating passage L1 and passing through an auxiliary expansion valve 13a, with a refrigerant in the circulating passage L1; a gas cooling passage L4 reaching an intermediate pressure part 33 in the screw compressor 11 from an outflow port 23b of the cooling jacket 23; and a temperature sensing cylinder 17 provided in a temperature detectable manner in the gas cooling passage L4 to adjust the opening of the auxiliary expansion valve 13a based on temperature so that the refrigerant is in a gas-liquid mixed state in the economizer passage L3 and in a gas state in the gas cooling passage L4.
| JPH10227535A | 1998-08-25 | |||
| JP2000179486A | 2000-06-27 |
Yasumichi Furukawa
Atsushi Maeda