Patent Application
20150219263
1. Technical Field
Disclosed herein are dual-walled flanges for dual-walled supply lines configured and designed to supply fuel or other hazardous fluids. Furthermore, methods for manufacturing such dual-walled flanges are also disclosed.
2. Description of the Related Art
Dual-walled tubing systems or coaxial tubing systems are used to convey fluid from one location to another. Dual-walled tubing systems include an inner tube disposed within and an outer tube. In one example, fluid may be conveyed through the inner tube while the outer tube contains any fluid that escapes from the inner tube. While dual-walled tubing systems may be used to convey many types of fluid, they are particularly useful for conveying fuels, hazardous liquids, toxic gases, etc. Dual-walled tubing systems are available in a variety of different sizes. Such dual-walled tubing systems may also be employed to convey two fluids, such as a first fluid conveyed through the inner tube and a second fluid conveyed through the annulus between the inner and outer tubes.
When used as a natural gas supply tine, dual-walled tubing systems may prevent leakage of natural gas into the atmosphere in case of damage to the inner tube, a seal or a weld. The outer tube may contain the gas leaking from the inner tube. However, the inner and outer tubes may be connected to various end fittings or flanges that connect the inner and outer tubes to a crankcase or other device. Currently, no flange or end fitting designs exist that convey leakage from the inner tube to the outer tube and that are easy to manufacture and install.
In one aspect, a flange is disclosed which may include a body having a first side and a second side with an opening extending from the first side to the second side. The body may further include a sleeve connected to and extending outward from the second side of the body. The sleeve may have an inner surface that encircles the opening as well as an outer surface. The body may include at least one through hole disposed radially outside of the opening and in radial alignment with the outer surface of the sleeve. The at least one through hole may extend from the first side of the body at least partially into the outer surface of the sleeve thereby providing communication between the first side of the body and the outer surface of the sleeve.
In another aspect, a dual-walled flange assembly is disclosed. The disclosed assembly may include a body having a first side and a second side with an opening extending from the first side to the second side. The body may further include a sleeve connected to and extending outward from the second side of the body. The sleeve may have an inner surface that encircles the opening and an outer surface. The body may include at least one through hole disposed radially outside of the opening and in radial alignment with the outer surface of the sleeve. The at least one through hole may extend from the first side of the body at least partially into the outer surface of the sleeve. The assembly may further include an inner tube having one end mateably received in the opening and another end extending outward from the first side of the body. The assembly may further include an outer tube that encircles at least part of the inner tube and the at least one through hole. The outer tube may have one end coupled to the first side of the body and another end extending outward from the first side of the body. The at least one through hole may provide communication between the first side of the body and the outer surface of the sleeve.
In another aspect, a method is disclosed for fabricating a dual-walled flange assembly for a sealed connection between coaxial inner and outer tubes and a fitting. The method may include forming a unitary body including a first side and a second side with an opening extending from the first side to the second side. The body may further include a sleeve connected to an extending outward from the second side of the body. The sleeve may have an inner surface that encircles the opening and an outer surface. The sleeve may be sized to be mateably received in the fitting. The method may further include forming at least one through hole disposed radially outside of the opening and in radial alignment with the outer surface of the sleeve. The at least one through hole may extend from the first side of the body at least partially into the outer surface of the sleeve thereby providing communication between the first side of the body and the outer surface of the sleeve. The method may further include providing an inner tube sized to be mateable received in the opening and providing an outer tube sized to encircle the inner tube and the at least one through hole. The method may further include connecting one end of the outer tube to the first side of the body with the at least one through opening and the inner tube disposed radially within the outer tube.
Other advantages and features will be apparent from the following detailed description when read in conjunction with the attached drawings.
For a more complete understanding of the disclosed methods and apparatuses, reference should be made to the embodiment illustrated in greater detail on the accompanying drawings, wherein:
It should be understood that the drawings are not necessarily to scale and that the disclosed embodiments are sometimes illustrated diagrammatically and in partial views. In certain instances, details which are not necessary for an understanding of the disclosed methods and apparatuses or which render other details difficult to perceive may have been omitted. It should be understood, of course, that this disclosure is not limited to the particular embodiments illustrated herein.
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The flange 11 may include a body 14 having a first side 15 and a second side 16. An opening 17 may extend from the first side 15 to the second side 16 as illustrated in
The inner tube 12 may be sized to be accommodated in the opening 17. The inner tube 12 may be secured in place by welding the inner tube 12 to the opening 17 or to an inner surface of the sleeve 18. The weld may be disposed at the proximal end 23 of the inner tube 12 and the opening 17. In contrast, the outer tube 13 may be secured to the first side 15 of the body 14 of the flange 11. More specifically, the weld may be disposed at the junction of the proximal end 24 of the outer tube 13 and the first side 15 of the body 14.
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A flange 11 for connecting coaxial or dual tubes 12, 13 to a female fitting 29 is disclosed. The flange 11 includes one or more through holes 25 that extend from a first side 15 of the flange body 14 to a second side 16 of the flange body 14. The through holes 25 may be used to convey leakage from the inner tube 12 to an annulus 26 disposed between the inner tube 12 and the outer tube 13. The outer tube 13 contains any leakage from the inner tube 12 and the through holes 25 convey that leakage through the annulus 26 instead of allowing leaked fluid or gas from escaping the piping and leaking into an airbox and/or the atmosphere. The sleeve 18 that extends outward from the second side 16 of the flange body 14 may optionally include a static seal on its outer surface 19 and the second side 16 of the flange body 14 may accommodate a face seal 32. Thus, the disclosed flange 11 acts to contain leakage from the inner tube 12 as well as any leakage from the fitting 29, which may be an airbox crankcase or another fitting on an engine, generator, etc.
The disclosed flange 11 may be formed using known manufacturing techniques. A unitary body 14 may be formed as illustrated in
