| 摘要 |
A screw compressor, in which a pair of intermeshing male and female screw rotors are housed in a rotor chamber formed in a casing, and a gas sucked from an intake channel is compressed by the screw rotors and discharged from a discharge channel, includes: a columnar space provided with a functional end face having an opening into an intermediate pressure section, which is an empty space in the rotor chamber and isolatable from both the intake channel and the discharge channel by the screw rotors, and also having an opening into a bypass channel which is communicated with the discharge channel; a piston fittingly inserted in the columnar space and brought into contact with the functional end face, to thereby separate the intermediate pressure section from the bypass channel when the piston is brought into contact with the functional end face; and a pressure detection channel for allowing an area located on an opposite side of the functional end face in the columnar space to communicate with the discharge channel. |
