Pipes and tubular conduits – Longitudinally seamed – Sectional
Patent
1994-10-03
1997-11-04
Scherbel, David
Pipes and tubular conduits
Longitudinally seamed
Sectional
138156, 174101, F16L 900
Patent
active
056829264
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a channel system having a cross-section with rounded corners, and comprising various elements, such as straight, branch, corner, reducing fittings and the like. The elements have planar and arched, for example, convex, concave or corresponding walls, and are manufactured of a material preferably with thin walls, such as sheet metal, plastic or the like. For achieving a cross-section with rounded corners, at least some of the elements of the channel system are formed by using joining arrangements to connect at least arched wall parts with each other, preferably along the edges thereof, whereby the elements connected with each other form a flow or wiring channel or the like.
BACKGROUND OF THE INVENTION
Particularly as flow channels, channels having a cross-section with rounded corners are more advantageous than acute-angled, for example, rectangular or quadratic channels. In a channel with acute angles, the flow is naturally not evenly distributed onto all parts of the wall, as compared with a channel with rounded corners, but turbulence is induced by acute angles. Thus, for example, in ordinary ventilation systems, impurities are slowly accumulated in the ducts.
Commonly used channels with rounded corners are spiral tubes which are manufactured for each standardized tube size. In a channel system made of spiral tubes, the various branch, corner, reducing and corresponding fittings are manufactured by applying ordinary sheet working techniques. Thus the manufacture of the elements requires good professional skills and/or specially tailored equipment, such as molds, templates or the like. For manufacturing reasons, it is usually necessary to provide certain elements of a channel system having a cross-section with otherwise rounded corners with partly sharp edges, whereby it is not possible to maintain the advantageous cross-section with rounded corners in all parts. Naturally, for different elements needed for each tube size, tools for each size must be used. In practice, such channel systems made of spiral tubes usually have a clumsy general appearance due to use of elements manufactured with most various techniques and skills.
The publications GB-1,301,858 and GB-1,552,916 disclose elements formed by planar parts joined together, which are applicable for use in a channel system with having a cross-section with sharp edges. GB-1,301,858 presents a fireproof channel element, the wall being formed by flat plates joined together by corrosion-resistant connecting means fixed at the inner edges and the outer surfaces of the joints being welded. GB-1,552,916 presents a solution for forming the walls of an element of flat plates notched and bent into a right angle, which are fixed to each other by U-shaped connecting means and support frames. The solutions of both publications are only applicable for manufacturing elements having a cross-section with sharp edges. Further, the application requires precise dimensioning of the wall parts and the use of particular connecting means. Consequently, these solutions are demanding with respect to both their manufacturing, to secure sufficient compatibility of elements, and their installation, because several operations are needed.
Finnish Patent Application No. 497/71 presents a method and device for connecting elements in ventilation systems with high requirements for tightness. The method presented in the publication can also be applied for manufacturing elements of a channel system with a cross-section having rounded corners. The publication relates to manufacturing elements of separate wall surfaces, their edges being equipped with joint arrangements. The joint arrangements are formed by a U-shaped joint part at the edge of another wall surface, the edge of the opposite wall surface being placed therebetween. The publication discloses applications with a cross-section with rounded corners of a straight element, a T-branch and an angle of 90.degree., each being formed by two arched wall surfaces placed against each othe
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Brinson Patrick F.
Scherbel David
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