US2014030666A1PendingUtilityA1

Flashback arrestor

31
Individually held — no corporate assignee on recordPriority: Jul 30, 2012Filed: Jul 30, 2012Published: Jan 30, 2014
Est. expiryJul 30, 2032(~6 yrs left)· nominal 20-yr term from priority
Inventors:David A. PryorNhyanh Duyet Nguyen
B23K 37/006F23D 14/38B23K 5/22Y02E20/34B23K 7/10F23D 14/54A62C 4/02F23D 14/465F23D 14/82
31
PatentIndex Score
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Claims

Abstract

A flashback arrestor for use in gas cutting or welding equipment includes a porous body which defines a proximal end portion and a distal end portion and which has a plurality of pores. Each of the pores defines a pore size. The pore size is a function of a detonation cell size such that the pore size is increased to reduce a size of the sintered body.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A flashback arrestor for use in gas cutting or welding equipment comprising:
 a porous body defining a proximal end portion and a distal end portion and having a plurality of pores, each of the pores defining a pore size,   wherein the pore size is a function of a detonation cell size such that the pore size is increased to reduce a size of the sintered body.   
     
     
         2 . The flashback arrestor according to  claim 1 , wherein the pore size is between approximately 10 and approximately 16 microns. 
     
     
         3 . The flashback arrestor according to  claim 1  further comprising a fitting disposed at the proximal end portion, the fitting being adapted to secure the flashback arrestor to the gas cutting or welding equipment. 
     
     
         4 . The flashback arrestor according to  claim 3 , wherein the fitting is sized to fit within a bore of a standard pipe thread. 
     
     
         5 . The flashback arrestor according to  claim 4 , wherein the standard pipe thread is a ¼-18 National Pipe Thread (NPT). 
     
     
         6 . The flashback arrestor according to  claim 3  further comprising a filter disposed within the fitting. 
     
     
         7 . The flashback arrestor according to  claim 1 , further comprising an end cap secured to a distal end portion of the porous body. 
     
     
         8 . The flashback arrestor according to  claim 1 , wherein the porous body is formed with a sintering process. 
     
     
         9 . The flashback arrestor according to  claim 1 , wherein the pores define passageways through the porous body having irregular shapes. 
     
     
         10 . The flashback arrestor according to  1 , wherein the sintered body defines a cylindrical geometry. 
     
     
         11 . A flashback arrestor for use in gas cutting or welding equipment comprising:
 a body defining a proximal end portion and a distal end portion and having a plurality of pores, each of the pores defining a pore size,   wherein the pore size is a function of a detonation cell size such that the pore size is increased to reduce a size of the body.   
     
     
         12 . The flashback arrestor according to  claim 11 , wherein the body is sintered. 
     
     
         13 . The flashback arrestor according to  claim 11  further comprising a fitting disposed at the proximal end portion, the fitting being adapted to secure the flashback arrestor to the gas cutting or welding equipment. 
     
     
         14 . The flashback arrestor according to  claim 13 , wherein the fitting is sized to fit within a bore of a standard pipe thread. 
     
     
         15 . The flashback arrestor according to  claim 13  further comprising a filter disposed within the fitting. 
     
     
         16 . The flashback arrestor according to  claim 11 , wherein the pore size is between approximately 10 and approximately 16 microns. 
     
     
         17 . The flashback arrestor according to  claim 11 , wherein the pore size is a function of an initial pressure of a gas mixture and an equivalence ratio of the gas mixture. 
     
     
         18 . The flashback arrestor according to  claim 17 , wherein the pore size λ is defined by the equation:
   λ=1309.2×( P ) −0.907  
 
 wherein P is the initial pressure of a mixture of oxygen and acetylene having an equivalence ratio of about 2.5. 
 
     
     
         19 . A device for arresting a flame comprising:
 a body having a plurality of pores, each of the pores defining a pore size,   wherein the pore size is a function of a detonation cell size such that the pore size is increased to reduce a size of the body.   
     
     
         20 . The device according to  claim 19 , wherein the body is sintered. 
     
     
         21 . A flashback arrestor for use in gas cutting or welding equipment comprising:
 a sintered body defining a proximal end portion and a distal end portion and having a plurality of pores, each of the pores defining a pore size;   a fitting disposed at the proximal end portion, the fitting being sized to fit within a bore of a standard pipe thread,   wherein the pore size is a function of a detonation cell size such that the pore size is increased to reduce a size of the sintered body.   
     
     
         22 . The flashback arrestor according to  claim 21  further comprising a filter disposed within the fitting. 
     
     
         23 . The flashback arrestor according to  claim 21 , wherein the pore size is between approximately 10 and approximately 16 microns. 
     
     
         24 . An oxy-fuel cutting/welding torch comprising:
 a torch body defining a proximal end portion and a distal end portion;   an oxygen passageway having an inlet at the proximal end portion;   a fuel passageway having an inlet at the proximal end portion;   a first flashback arrestor disposed within the oxygen passageway at the proximal end portion; and   a second flashback arrestor disposed within the fuel passageway at the proximal end portion,   wherein each of the first and second flashback arrestors define a body having a proximal end portion and a distal end portion and comprise a plurality of pores, each of the pores defining a pore size, wherein the pore size is a function of a detonation cell size such that the pore size is increased to reduce a size of the body.   
     
     
         25 . The oxy-fuel cutting/welding torch according to  claim 24 , wherein the bodies of the flashback arrestors are sintered. 
     
     
         26 . The oxy-fuel cutting/welding torch according to  claim 24  further comprising:
 a first fitting disposed at the proximal end portion of the first flashback arrestor; and 
 a second fitting disposed at the proximal end portion of the second flashback arrestor, 
 the fittings being adapted to secure the flashback arrestors within the passageways of the oxy-fuel cutting/welding torch. 
 
     
     
         27 . The oxy-fuel cutting/welding torch according to  claim 26 , wherein the fittings are sized to fit within a bore of a standard pipe thread 
     
     
         28 . The oxy-fuel cutting/welding torch according to  claim 28  further comprising:
 a first filter disposed within the first fitting; and 
 a second filter disposed within the second fitting. 
 
     
     
         29 . The flashback arrestor according to  claim 24 , wherein the pore size is between approximately 10 and approximately 16 microns. 
     
     
         30 . A device for arresting a flame comprising:
 a body having a plurality of pores, each of the pores defining a target pore size,   wherein the pore size is a function of an initial pressure of a gas mixture and an equivalence ratio of the gas mixture such that the pore size is increased to reduce a size of the body.   
     
     
         31 . The device according to  claim 30 , wherein the target pore size λ is defined by the equation:
   λ=1309.2×( P ) −0.907  
 
 wherein P is the initial pressure of a mixture of oxygen and acetylene having an equivalence ratio of about 2.5.

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