| 摘要 |
The invention relates to a non-lubricated compressor which comprises a crankcase (1), some cylinders (2) provided with cooling elements (3) each of them having a cylinder cover (4), some pistons (9) travelling in translation motion inside said cylinders (2), each piston having an elastic inlet valve (14) and being driven by some rods (16) connected to a crankpin (19) with counterweights. The rods (16) are engaged in a translation motion by a crankshaft located inside the crankcase (1), the connection of the rods with the pistons (9) and the crankpin (19) being made by some grooved ball bearings (17 and 24). The crankshaft rests on some encased ball bearings (22 and 23) providing double support thereto and has a fixed counterweight (20) and a detachable counterweight (21) connected with the crankpin (19) by means of a screw. The pistons (9) comprise some antifriction skirts (11) pressed inside said pistons. The pistons (9) are provided with some openings (13) at the upper side, each of the pistons (9) having an elastic inlet valve (14) and a screw (15). The sealing of each piston (9) and its cylinder is provided by an antifriction segment (10), mounted inside a channel located at the upper side of the pistons (9).
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