Abrasive water jet nozzle and abrasive water jet machine

Abstract

Provided is an abrasive water jet nozzle comprising a mixing chamber for absorbing the abrasives with air through a supply port; a water nozzle; a mixing nozzle disposed on the downstream side against the water nozzle, to mix the abrasives in a water jet jetted out of the water nozzle, and to jet the water jet into the mixing chamber out of a through hole of the mixing nozzle; and an abrasive nozzle disposed on the downstream side against the mixing nozzle, to introduce the water jet thereinto to jet an abrasive water jet. A diameter of the through hole is larger than that of the water nozzle so that the abrasives in the mixing chamber are absorbed with air in a clearance between the through hole and the water jet passing through the through hole to mix the abrasives in the water jet.

What is claimed is: 
     
         1 . An abrasive water jet nozzle for jetting an abrasive water jet to a workpiece to process the workpiece, the abrasive water jet being a water jet supplied to an inlet hole and mixed with abrasives, comprising:
 a mixing chamber for absorbing the abrasives therein together with air through a supply port, the mixing chamber being composed as an air chamber;   a water nozzle having the inlet hole and to jet the water jet;   a mixing nozzle disposed on a downstream side against the water nozzle, to mix the abrasives in the water jet jetted out of the water nozzle, and to jet the water jet mixed with the abrasives into the mixing chamber out of a through hole of the mixing nozzle; and   an abrasive nozzle disposed on a downstream side against the mixing nozzle, to introduce the water jet mixed with the abrasives thereinto, and to jet the abrasive water jet to the workpiece,   wherein a diameter of the through hole of the mixing nozzle is larger than a diameter of an inlet port of the inlet hole of a nozzle part of the water nozzle so that the abrasives stayed in the mixing chamber are absorbed together with air in a clearance formed between an inner surface defining the through hole and the water jet passing through the through hole to mix the abrasives in the water jet in the through hole.   
     
     
         2 . The abrasive water jet nozzle according to  claim 1 , wherein the diameter of the through hole of the mixing nozzle is 5 to 25 times as large as the diameter of the inlet port of the inlet hole of the nozzle part of the water nozzle. 
     
     
         3 . The abrasive water jet nozzle according to  claim 1 , wherein a length of the through hole of the mixing nozzle is longer than a distance from an outlet port positioned at a front end of the through hole to the abrasive nozzle. 
     
     
         4 . The abrasive water jet nozzle according to  claim 2 , wherein a length of the through hole of the mixing nozzle is longer than a distance from an outlet port positioned at a front end of the through hole to the abrasive nozzle. 
     
     
         5 . The abrasive water jet nozzle according to  claim 1 , wherein a diameter of a through hole of the abrasive nozzle is smaller than the diameter of the through hole of the mixing nozzle, and is larger than the diameter of the inlet port of the inlet hole of the nozzle part of the water nozzle. 
     
     
         6 . The abrasive water jet nozzle according to  claim 2 , wherein a diameter of a through hole of the abrasive nozzle is smaller than the diameter of the through hole of the mixing nozzle, and is larger than the diameter of the inlet port of the inlet hole of the nozzle part of the water nozzle. 
     
     
         7 . The abrasive water jet nozzle according to  claim 3 , wherein a diameter of a through hole of the abrasive nozzle is smaller than the diameter of the through hole of the mixing nozzle, and is larger than the diameter of the inlet port of the inlet hole of the nozzle part of the water nozzle. 
     
     
         8 . The abrasive water jet nozzle according to  claim 1 , wherein the mixing nozzle has an approximately cylindrical shape and has a tapered part formed on an outer surface thereof, the tapered part being configured to decrease a diameter toward the abrasive nozzle, and the tapered part being formed from a position facing the supply port to a front tip of the mixing nozzle. 
     
     
         9 . The abrasive water jet nozzle according to  claim 2 , wherein the mixing nozzle has an approximately cylindrical shape and has a tapered part formed on an outer surface thereof, the tapered part being configured to decrease a diameter toward the abrasive nozzle, and the tapered part being formed from a position facing the supply port to a front tip of the mixing nozzle. 
     
     
         10 . The abrasive water jet nozzle according to  claim 3 , wherein the mixing nozzle has an approximately cylindrical shape and has a tapered part formed on an outer surface thereof, the tapered part being configured to decrease a diameter toward the abrasive nozzle, and the tapered part being formed from a position facing the supply port to a front tip of the mixing nozzle. 
     
     
         11 . The abrasive water jet nozzle according to  claim 5 , wherein the mixing nozzle has an approximately cylindrical shape and has a tapered part formed on an outer surface thereof, the tapered part being configured to decrease a diameter toward the abrasive nozzle, and the tapered part being formed from a position facing the supply port to a front tip of the mixing nozzle. 
     
     
         12 . An abrasive water jet machine including the abrasive water jet nozzle according to  claim 1  and an abrasive supply apparatus for supplying a predetermined quantity of abrasives to the mixing chamber,
 wherein the abrasive supply apparatus comprises:
 a reservoir for reserving the abrasives therein; 
 a flowing out hole formed in a lower part of the reservoir; 
 a conveyance rotor disposed so as to define a predetermined gap below the flowing out hole, and capable of rotating around a horizontal axis; 
 a receiver disposed below the conveyance rotor; and 
 an exhaust port formed in the receiver. 
 
 
     
     
         13 . An abrasive water jet machine including the abrasive water jet nozzle according to  claim 2  and an abrasive supply apparatus for supplying a predetermined quantity of abrasives to the mixing chamber,
 wherein the abrasive supply apparatus comprises:
 a reservoir for reserving the abrasives therein; 
 a flowing out hole formed in a lower part of the reservoir; 
 a conveyance rotor disposed so as to define a predetermined gap below the flowing out hole, and capable of rotating around a horizontal axis; 
 a receiver disposed below the conveyance rotor; and 
 an exhaust port formed in the receiver. 
 
 
     
     
         14 . An abrasive water jet machine including the abrasive water jet nozzle according to  claim 3  and an abrasive supply apparatus for supplying a predetermined quantity of abrasives to the mixing chamber,
 wherein the abrasive supply apparatus comprises:
 a reservoir for reserving the abrasives therein; 
 a flowing out hole formed in a lower part of the reservoir; 
 a conveyance rotor disposed so as to define a predetermined gap below the flowing out hole, and capable of rotating around a horizontal axis; 
 a receiver disposed below the conveyance rotor; and 
 an exhaust port formed in the receiver. 
 
 
     
     
         15 . An abrasive water jet machine including the abrasive water jet nozzle according to  claim 5  and an abrasive supply apparatus for supplying a predetermined quantity of abrasives to the mixing chamber,
 wherein the abrasive supply apparatus comprises:
 a reservoir for reserving the abrasives therein; 
 a flowing out hole formed in a lower part of the reservoir; 
 a conveyance rotor disposed so as to define a predetermined gap below the flowing out hole, and capable of rotating around a horizontal axis; 
 a receiver disposed below the conveyance rotor; and 
 an exhaust port formed in the receiver. 
 
 
     
     
         16 . An abrasive water jet machine including the abrasive water jet nozzle according to  claim 8  and an abrasive supply apparatus for supplying a predetermined quantity of abrasives to the mixing chamber,
 wherein the abrasive supply apparatus comprises:
 a reservoir for reserving the abrasives therein; 
 a flowing out hole formed in a lower part of the reservoir; 
 a conveyance rotor disposed so as to define a predetermined gap below the flowing out hole, and capable of rotating around a horizontal axis; 
 a receiver disposed below the conveyance rotor; and 
 an exhaust port formed in the receiver. 
 
 
     
     
         17 . The abrasive water jet machine according to  claim 12 , wherein the conveyance rotor has a concavo-convex part formed on an outer surface thereof. 
     
     
         18 . The abrasive water jet machine according to  claim 13 , wherein the conveyance rotor has a concavo-convex part formed on an outer surface thereof. 
     
     
         19 . The abrasive water jet machine according to  claim 14 , wherein the conveyance rotor has a concavo-convex part formed on an outer surface thereof. 
     
     
         20 . An abrasive water jet machine including the abrasive water jet nozzle according to  claim 1 .