Fluid injection device

Abstract

A fluid injection device includes a pulse generator which converts fluid into pulse flow, a suction pipe projecting from the pulse generator, an injection pipe which is eccentrically inserted into the suction pipe such that the outer circumferential surface of the injection pipe contacts the inner circumferential surface of the suction pipe, and has an injection opening communicating with the pulse generator, and a suction channel and a suction opening formed between the inner circumferential surface of the suction pipe and the outer circumferential surface of the injection pipe. The injection pipe is fixed to the inner circumferential surface of the suction pipe in the vicinity of the injection opening.

1 - 11 . (canceled) 
     
     
         12 . A fluid injection unit comprising:
 an injection pipe that includes an injection opening configured to inject fluid; and   a suction pipe that includes a suction opening configured to suck fluid injected from the injection opening,   wherein the injection pipe is located in the suction pipe and a tip portion of the injection pipe is eccentric to the suction pipe,   wherein the tip portion of the injection pipe has a bent portion.   
     
     
         13 . The fluid injection unit according to  claim 12 , wherein the tip portion of the injection pipe contacts with a tip portion of the suction pipe 
     
     
         14 . The fluid injection unit according to  claim 12 , wherein a tip portion of the suction pipe having a bent portion and the tip portion of the injection pipe follows an inner circumferential surface of the suction pipe. 
     
     
         15 . The fluid injection unit according to  claim 12 , wherein a flow channel diameter of the suction pipe is larger than a bending height of the tip portion of the injection pipe. 
     
     
         16 . The fluid injection unit according to  claim 12 , wherein a length of the injection pipe and the suction pipe is 200-400 mm. 
     
     
         17 . The fluid injection unit according to  claim 12 , wherein the injection pipe is urged toward the suction pipe.