Aircraft fuel pipe coupling

Abstract

A coupling for connecting double-walled fuel comprises a pipe end fitting (1), which includes a male outer surface for example including a groove (12) and a female inner surface for example including a groove (11). The coupling also includes a double-walled socket (4), which includes a female outer socket (17) and a male inner shaft (18). The pipe end fitting is partially accommodated in the region between the female outer socket and the male inner shaft of the double-walled socket. A first seal ring (9) seals between the female inner surface of the pipe end fitting (1) and the male inner shaft (18) of the double-walled socket (4). A second seal ring (10) which may be substantially coplanar with the first, seals between the male outer surface of the pipe end fitting (1) and the female outer socket (17) of the double-walled socket (4).

Description

technical field [0001] The present invention relates to aircraft fuel line couplings, and in particular, but not exclusively, to flexible pipe couplings for connecting a double wall tube to another fuel line in an aircraft fuel system. Background technique [0002] In aircraft fuel systems, it is often necessary to use double wall pipes, fittings and couplings to protect fuel from leakage. When the risk of leakage is high, such as in the pressurized fuselage of an aircraft, the entire fuel system can be double-walled. Where there is less risk of leakage, only double wall couplings may be used. Additional complications arise due to the need to use flexible couplings to compensate for manufacturing tolerances, structural deviations and thermal effects. [0003] Figure 1 of the accompanying drawings shows a prior art connection of a single wall pipe (not shown, but positioned to the left of the coupling as shown in Figure 1 ) and a double wall pipe 102 (to the right of the co...

AI Technical Summary

Problems solved by technology

Prior art couplings also require complex electrical connections between the tubes

Images