TURBINE FOR REFRIGERATING CYCLE

PURPOSE:To reduce the friction of a bearing by supplying refrigerant liquid falling down along the inner wall surface of a casing by a structure wherein grooves radially extending from the bearing part are arranged on the inner wall surface of the casing of a turbine for refrigerating cycle. CONSTITUTION:A turbine disc 20 with a rotary shaft 21 is housed in the interior of a casing 17 at a turbine 13 for refrigerating cycle. A refrigerant lead-in pipe 23 connected to a capillary tube 12 is provided at the upper part, while a refrigerant drain hole 26 at the lower part of the casing 17. A plurality of grooves 25 are formed radialy upwards about a bearing part 24 as a center on the inner side wall of the casing 17. Consequently, refrigerant, which is blasted from the lead-in pipe 23 against the disc 20 and flowed on the inner wall surface of the casing 17, is collected by the grooves 25 to the bearing part 24 in order to lubricate a bearing sufficiently. Thus, the reduction of frictional resistance and consequent wear can be realized without giving any influence to refrigerating cycle.