Screw compressor with economizer

Abstract

A screw compressor for connecting with an economizer for gas supply, includes a main body defining a compressor cavity, a male rotor and a female rotor received in the compressor cavity, a gas-vent base defining at least one gas-supply hole therein adapted for communicating with the economizer. The male rotor and the female rotor are parallel to and meshed with each other. At least the male rotor includes at least two teeth defining at least one tooth channel therebetween. The gas-supply hole is axially aligned with the at least one tooth channel to let gas from the economizer pass therethrough and enter into the at least one tooth channel along the axial direction of the male rotor.

What is claimed is: 
     
         1 . A screw compressor adapted for connecting with an economizer for gas supply, comprising:
 a main body defining a compressor cavity;   a male rotor and a female rotor received in the compressor cavity, the male rotor and the female rotor meshed with each other, and at least the male rotor comprising at least two teeth defining at least one tooth channel therebetween;   a gas-vent base defining at least one gas-supply hole therein adapted for communicating with said economizer; and wherein the gas-supply hole is axially aligned with the at least one tooth channel to let gas from the economizer pass therethrough and enter into the at least one tooth channel along the axial direction of the male rotor.   
     
     
         2 . The screw compressor as claimed in  claim 1 , wherein the outer contour of the gas-supply hole is similar to that of the tooth of the male rotor. 
     
     
         3 . The screw compressor as claimed in  claim 2 , wherein the area of the gas-supply hole is no larger than that of the tooth. 
     
     
         4 . The screw compressor as claimed in  claim 1 , wherein the gas-supply hole rotates at a first angle, while the male rotor rotates at a second angle of the at least tooth channel, and wherein the first angle of the gas-supply hole is always smaller than the second angle of the at least one tooth channel. 
     
     
         5 . The screw compressor as claimed in  claim 1 , wherein the gas-supply hole comprises first and second lateral boundaries and a bottom boundary connecting with the first and second lateral boundaries, and the tooth of the male rotor comprises first and second lateral edges, and wherein as the male rotor rotates, the first and second lateral boundaries of the gas-supply hole is capable of partially anastomosing with the first and second lateral edges of the male rotor. 
     
     
         6 . The screw compressor as claimed in  claim 1 , wherein the gas-supply hole has at least one of the shapes of triangle, circle, rectangular, flat bar. 
     
     
         7 . The screw compressor as claimed in  claim 1 , wherein the gas-vent base defines a plurality of gas-supply holes therethrough to communicate with said economizer and the at least one tooth channel of the male rotor. 
     
     
         8 . The screw compressor as claimed in  claim 1 , wherein the screw compressor is a dual-screw compressor. 
     
     
         9 . The screw compressor as claimed in  claim 1 , wherein the screw compressor is a triple-screw compressor. 
     
     
         10 . The screw compressor as claimed in  claim 5 , wherein the at least two teeth of the male rotor comprises a first tooth and a second tooth, and wherein before the gas-supply hole communicates with the at least one tooth channel, the male rotor rotates to such a position that the second lateral boundary of the gas-supply hole partially anastomoses with the second lateral edge of the first tooth. 
     
     
         11 . The screw compressor as claimed in  claim 10 , wherein as the gas-supply hole is going to separate from the at least one tooth channel, the male rotor rotates to such a position that the first lateral boundary of the gas-supply hole partially anastomoses with the first lateral edge of the second tooth.