Patent ID: 8485805

Claim:
A rotary compressor, comprising: a plurality of cylinders, each of the plurality of cylinders comprising a compression space, a rolling piston and a vane for compressing refrigerant in the compression space; a middle plate installed between two adjacent cylinders of the plurality of cylinders; a plurality of bearings each configured to cover an outer surface of a respective cylinder so as to define the compression space of each cylinder together with the middle plate; and a plurality of coupling bolts inserted through the plurality of beatings and the plurality of cylinders so as to be respectively coupled to two opposite sides of the middle plate, wherein a length H b of each coupling bolt is proportional to thicknesses H c1 and H c2 of the plurality of cylinders and a thickness H m of the middle plate, and wherein the length H b of each coupling bolt is proportional to the thicknesses H c1 and H c2 of the cylinders and the thickness H m of the middle plate in accordance with the formula A ⁢ H c ⁢ ⁢ 1 + H c ⁢ ⁢ 2 H m < H b < B ⁢ H c ⁢ ⁢ 1 + H c ⁢ ⁢ 2 H m , where variable A is in the range of 15<A<20, and variable B is in the range of 25<B<30.