| 摘要 |
A refrigerant comprises a piston reciprocated within a cylinder block by a crank driven by an electric motor. A cylinder head (30) includes an inlet chamber and an outlet chamber (33). Refrigerant is supplied to the cylinder block (60), to be compressed by the action of the piston, from a muffler (10) via a conduit (22) and the inlet chamber. In order to reduce the transfer of heat to the refrigerant before compression, the inlet chamber has a liner (23) of a material of low thermal conductivity and the conduit (22) is also formed of material having low thermal conductivity. Manufacture may be simplified by forming the lining and the conduit (22) as single unit (20). The unit (20) is received in a recess (31) in the cylinder head and is retained by screws (239). A capillary tube (41) for supplying lubricant to the inlet chamber is provided. <IMAGE>
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