Abrasive media blast nozzle

Abstract

A nozzle used in an abrasive blast cleaning apparatus through which a plurality of abrasive particles is propelled. The nozzle has a first bore with a constant first diameter, a radially converging section, a throat section with a constant second diameter, a radially diverging section, a second bore, and a second bore having a constant third diameter. The first bore defines a first end for receiving the abrasive particles and a second end. The radially converging section defines a third end connected to the second end and a fourth end. The throat section defines a fifth end and a sixth end, wherein the fifth end is connected to the fourth end of the converging section. The radially diverging section defines a seventh end and an eighth end, wherein the seventh end is connected to the sixth end of the throat section. The second bore defines a ninth end and an exit, wherein the ninth end is connected to the eighth end. The constant first and third diameters are larger than the constant second diameter.

1 . A nozzle for use in an abrasive blast cleaning apparatus through which a plurality of abrasive particles is propelled, the nozzle comprising: 
 a first bore having a constant first diameter and defining a first end and a second end, wherein the first bores receives the abrasive particles;    a radially converging section defining a third end and a fourth end, wherein the third end is connected to the second end of the first bore;    a throat section having a constant second diameter that is smaller than the first diameter, further defining a fifth end and a sixth end, wherein the fifth end is connected to the fourth end of the converging section;    a radially diverging section defining a seventh end and an eighth end, wherein the seventh end is connected to the sixth end of the throat section; and    a second bore having a constant third diameter and defining a ninth end and an exit from which the abrasive particles are propelled away from the nozzle, wherein the ninth end is connected to the eighth end.    
   
   
       2 . The nozzle of  claim 1 , wherein the first bore, the radially converging section, the throat section, the radially diverging section and the second bore are made of boron carbide.  
   
   
       3 . The nozzle of  claim 1 , wherein the nozzle comprises a malleable or compressive jacket member surrounding the first bore, the radially converging section, the throat section, the radially diverging section and the second bore are made of boron carbide.  
   
   
       4 . The nozzle of  claim 3 , wherein the jacket member is made of aluminum, steel, or polyurethane.  
   
   
       5 . The nozzle of  claim 1 , whereint eh third constant diameter is larger than the constant second diameter.  
   
   
       6 . A nozzle for use in an abrasive blast apparatus from which a plurality of abrasive particles is propelled by a compressed fluid flowing therethrough, the nozzle comprising a continuous inner member which defines a converging bore, a first straight bore extending from the converging bore, a diverging bore extending from the first straight bore, and a second straight bore extending from the diverging bore.  
   
   
       7 . The nozzle of  claim 6 , wherein the first straight bore has a diameter smaller than that of the second straight bore.  
   
   
       8 . The nozzle of  claim 6 , wherein the inner member is made of boron carbide.  
   
   
       9 . The nozzle of  claim 6 , further comprising a jacket member surrounding the inner member.  
   
   
       10 . The nozzle of  claim 9 , wherein the jacket member is made of steel, aluminum or polyurethane.  
   
   
       11 . The nozzle of  claim 6 , wherein the inner member further defines an additional straight bore having a first end for receiving the compressed fluid and abrasive particles and a second end from which the converging bore extends.