Screw compressor

A screw compressor, comprising:

• a casing including a cylindrically-shaped cylinder, a main body surrounding a vicinity of the cylinder, and a high-pressure fluid passage provided between the main body and the cylinder;
• and
• a screw rotor including a plurality of helical grooves, the screw rotor being inserted into the cylinder to define fluid chambers, and a fluid being sucked into the fluid chambers to compress the fluid in the screw compressor;
• a discharge passage disposed in the casing, the discharge passage guiding the fluid that has been discharged from the fluid chambers to the high-pressure fluid passage;
• and
• at least one muffler space disposed in the casing, the at least one muffler space communicating with the discharge passage so as to reduce a pressure fluctuation of the fluid flowing from the discharge passage to the high-pressure fluid passage,
• the casing including a cylindrically-shaped bearing holder holding a bearing, the bearing supporting a drive shaft of the screw rotor,
• the bearing holder being fitted into an end of the cylinder, and the bearing holder having an outer peripheral surface facing an inner peripheral surface of the cylinder, and
• the at least one muffler space being configured as a recessed groove extending circumferentially along the bearing holder and being formed in at least one of
• the outer peripheral surface of the bearing holder,
• a portion of the inner peripheral surface of the cylinder, the portion facing the bearing holder, and
• the recessed groove constituting the at least one muffler space being formed over an entire periphery of the bearing holder.