Suction filter, turbo compressor, and method of packaging the compressor

A turbocompressor comprising:

• an integral cast casing with first-, second- and third-stage compressors and with all of air coolers corresponding to said compressors being incorporated therein, said respective stage compressors being connected to the corresponding air coolers through compressed air passages, respectively,
• the air coolers incorporated in the integral cast casing being first and second intercoolers and an aftercooler;
• the integral cast casing being provided by integrally casting into the single casting a casting scroll of the first-stage compressor, further casting scroll of the second-stage compressor, further casting scroll of the third-stage compressor, a receptacle for the first intercooler, further receptacle for the second intercooler, a receptacle for the aftercooler, a compressed air passage introducing compressed air from the scroll of the first-stage compressor to the receptacle for the first intercooler, a compressed air passage introducing compressed air from the scroll of the second-stage compressor to the receptacle for the second intercooler, a receptacle for a power transmission mechanism, and an aftercooler outlet and a blowoff outlet;
• an oil tank arranged on a side of the integral cast casing, and
• a blowoff silencer placed between the oil tank and the integral cast casing so as to be pinched therebetween, the blowoff silencer being connected to the aftercooler through a blowoff pipe.