초록 ▼

In the screw compressing apparatus, by rotating paired male and female rotors as meshing with each other, a gas is suctioned from a suction chamber into a working space, and compressed in the working space. The compressed high pressure gas is exhausted from a exhaust chamber, and then cooled by an a

In the screw compressing apparatus, by rotating paired male and female rotors as meshing with each other, a gas is suctioned from a suction chamber into a working space, and compressed in the working space. The compressed high pressure gas is exhausted from a exhaust chamber, and then cooled by an aftercooler, thereby producing a low temperature, high pressure gas. In the compression process, the temperature of the gas in the working space becomes high at the exhaust chamber side. When this exhaust gas temperature reaches a predetermined value, a part of the gas cooled by an aftercooler is injected into the working space for lowering the temperture in the working space.

대표청구항 ▼

A screw compressing apparatus, comprising: a screw compressor body including paired male and female rotors respectively rotating about two axes parallel to each other while meshing with each other, and a casing having a suction chamber communicating with a suction pipe and an exhaust chamber communi

A screw compressing apparatus, comprising: a screw compressor body including paired male and female rotors respectively rotating about two axes parallel to each other while meshing with each other, and a casing having a suction chamber communicating with a suction pipe and an exhaust chamber communicating with an exhaust pipe and accommodating said male and female rotors, an aftercooler disposed at said exhaust chamber side of said screw compressor body, an exhaust gas temperature detecting means disposed in one of said exhaust chamber of the compressor body and a pipe system extending from said exhaust chamber to said aftercooler for detecting the exhaust gas temperature, a gas injection port formed in the screw compressor body, said gas injection port being located so as to communicate with said working space only at a position located in at least an angular region extending from the exhaust process starting position towards the compression process starting position by an angular amount corresponding to one rotor tooth, a first gas passage connected with said gas injection port for introducing a gas having passed through said aftercooler through a first passage opening and closing means, a second gas passage connected with said gas exhaust port through a second passage opening and closing means, a controller for controlling the opening and closing of said first and second passage opening and closing means according to the exhaust gas temperature, a flow rate control valve disposed in said suction pipe for controlling a flow rate of the suction gas, and a controller for controlling said flow rate control valve according to the exhaust gas pressure.