Liquid-cooled screw compressor

Abstract

A liquid-cooled screw compressor (100) that takes in a gas and generates a compressed gas includes a screw rotor (2, 3), a casing (1) that stores the screw rotor (2, 3) and forms a working space (C) together with the screw rotor (2,3), and a cartridge (6) that is a separate member from the casing (1). A liquid feed path (7) that supplies a liquid to the working space (C) is formed by the casing (1) and the outer surface of the cartridge (6).

1 . A liquid-cooled screw compressor that takes in a gas and generates a compressed gas, the liquid-cooled screw compressor comprising:
 a screw rotor;   a casing that stores the screw rotor and forms a working space together with the screw rotor; and   a cartridge that is a separate member from the casing,   
       wherein
 a liquid feed path that supplies a liquid to the working space is formed by the casing and an outer surface of the cartridge. 
 
     
     
         2 . The liquid-cooled screw compressor according to  claim 1 , wherein
 the casing has a storage chamber that stores the screw rotor, an introduction path to which the liquid is introduced from an external of the casing, and a communication path that causes the storage chamber and the introduction path to communicate with each other,   at least one pair of jetting flow paths are formed by a tip portion of the cartridge and an inner surface of the communication path through disposing of the cartridge in the communication path, and   a plurality of the liquids jetted from the at least one pair of jetting flow paths collide with each other in the working space.   
     
     
         3 . The liquid-cooled screw compressor according to  claim 2 , wherein
 the cartridge has one pair of wide width surface portions opposite to each other,   the tip portion of the cartridge is formed into a tapered shape having one pair of tapered surface portions,   the communication path of the casing has one pair of inclined surface portions opposite to the one pair of tapered surface portions of the cartridge,   one pair of the liquid feed paths are formed by the casing and the outer surface of the cartridge,   the one pair of liquid feed paths have
 one pair of supplied liquid retaining spaces that are formed by the one pair of wide width surface portions of the cartridge and the inner surface of the communication path, and retain the liquid supplied from the introduction path, and 
 one or more pairs of the jetting flow paths that are formed by the one pair of tapered surface portions of the cartridge and the one pair of inclined surface portions of the communication path, and jet the liquid in the supplied liquid retaining spaces into the working space, and 
   flow path sectional area of the one pair of supplied liquid retaining spaces is larger than flow path sectional area of the one or more pairs of the jetting flow paths.   
     
     
         4 . The liquid-cooled screw compressor according to  claim 3 , wherein
 only one pair of the jetting flow paths are formed by the one pair of tapered surface portions and the one pair of inclined surface portions through disposing of the cartridge in the communication path,   the jetting flow paths are liquid film jetting flow paths jetting liquid films, and   the liquid films jetted from the one pair of liquid film jetting flow paths collide with each other in the working space.   
     
     
         5 . The liquid-cooled screw compressor according to  claim 3 , wherein
 a plurality of pairs of the jetting flow paths are formed by the one pair of tapered surface portions and the one pair of inclined surface portions through disposing of the cartridge in the communication path,   the jetting flow paths are jet flow jetting flow paths jetting jet flows, and   the jet flows jetted from the plurality of pairs of jet flow jetting flow paths collide with each other in the working space.   
     
     
         6 . The liquid-cooled screw compressor according to  claim 5 , wherein
 a plurality of grooves extending in a straight line manner from the wide width surface portion to a tip of the tip portion are formed in each of the one pair of tapered surface portions, and   the plurality of pairs of jet flow jetting flow paths are formed by the plurality of grooves and the inclined surface portions.   
     
     
         7 . The liquid-cooled screw compressor according to  claim 2 , wherein
 the communication path is coupled with the storage chamber by an elongated hole extending along an axial direction of the screw rotor, and   for each of one or more pairs of the jetting flow paths, a jetting opening that faces the working space is formed by the tip portion of the cartridge and the elongated hole.   
     
     
         8 . The liquid-cooled screw compressor according to  claim 2 , wherein
 the jetting flow paths are formed such that an angle formed by jet directions of the liquids each jetted from the respective jetting flow paths making the pair is equal to or larger than 30 degrees.   
     
     
         9 . The liquid-cooled screw compressor according to  claim 6 , wherein
 the plurality of grooves are formed along a direction orthogonal to an axial direction of the screw rotor.   
     
     
         10 . The liquid-cooled screw compressor according to  claim 6 , wherein
 the plurality of grooves are formed along a direction inclined with respect to each of an axial direction of the screw rotor and a direction orthogonal to the axial direction.   
     
     
         11 . The liquid-cooled screw compressor according to  claim 6 , wherein
 a groove extending in an axial direction of the screw rotor is formed at the tip of the tip portion of the cartridge.   
     
     
         12 . The liquid-cooled screw compressor according to  claim 3 , wherein
 the one pair of liquid feed paths are formed into a symmetrical shape with interposition of the cartridge therebetween.   
     
     
         13 . The liquid-cooled screw compressor according to  claim 3 , wherein
 a flow path sectional shape of the introduction path is a circular shape,   a through-hole that is disposed in the introduction path and has a circular shape is formed in the cartridge, and   opening area of the through-hole is equal to or larger than flow path sectional area of the introduction path.