Fuel Pipe Seal Geometry for Stable Inclined Line Contact
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Solution Overview
Problem
The existing fuel distribution devices face instability in sealing due to conical or spherical seal surface shapes, leading to variable seal pressure and inefficient conversion of tightening force into seal surface pressure, especially when the fuel pipe is inclined.
Innovation Solution
A fuel distribution device with a fuel distribution pipe featuring a first convex curved surface and a fuel pipe with a second concave curved surface, where the connecting member presses the seal section against the seat section from the opposite side of the fuel distribution pipe, ensuring stable sealing even when the fuel pipe is inclined, by concentrating the seal surface pressure through line contact and reducing surface roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the seal surface has a conical shape, then the fuel pipe can be tightened to the fuel distribution pipe, but the seal surface pressure changes depending on location when the fuel pipe is inclined, making stable sealing impossible
Solution Approach 1:
The patent applies spherical curvature to the seal surfaces. The fuel distribution pipe has a first convex curved surface with a specific radius of curvature, and the fuel pipe has a second concave curved surface with a larger radius of curvature. This spherical geometry ensures that when the connecting member tightens the fuel pipe, the seal surfaces maintain uniform contact and pressure distribution even when inclined, resolving the issue of variable seal surface pressure that occurs with conical shapes.
2Reliability
If the seal surface has a spherical shape, then the seal surfaces can contact each other, but the seal surface pressure is dispersed and tightening force cannot be efficiently converted into seal surface pressure
Solution Approach 1:
The patent applies local quality by creating a specific geometric relationship between the first convex curved surface and the second concave curved surface. The smaller radius of curvature of the first convex curved surface concentrates the contact area, while the larger radius of curvature of the second concave curved surface provides a receptive surface. This localized geometric configuration ensures that tightening force is efficiently converted into concentrated seal surface pressure at the interface, rather than being dispersed across a large spherical surface.
Data Source
AI summary
Provided is a fuel distribution device 1 including a fuel distribution pipe 3, a fuel pipe 4, and a connecting member 5. The fuel distribution pipe 3 has a seat section 21 having a first convex curved surface 24 formed on an outer circumferential surface thereof. The fuel pipe 4 has a seal section 27 having a second concave curved surface 28 formed on an inner circumferential surface thereof, and a second convex curved surface 29 corresponding to the second concave curved surface 28 is formed on an outer circumferential surface thereof. The connecting member 5 presses the seal section 27 against the seat section 21 from an opposite side of the fuel distribution pipe 3. A radius of curvature SR2 of the second concave curved surface 28 is greater than a radius of curvature SR1 of the first convex curved surface 24.