Y and T-finned tubes and methods and apparatus for their making
AssigneeWieland-Werke AG
InventorsManfred Saier, Hans-Werner Kastner, Robert Klockler
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Abstract
This invention concerns finned tubes for use in heat exchanging whereby the fins have a generally T or Y shape. There is disclosed process and apparatus for making these Y and T-finned tubes whereby a smooth tube is subjected to a rolling process with notching rollers being arranged between rolling discs. Bending rollers can be used to form Y fins and, if desired these can be subsequently flattened into T-fins.
Claims36
Apparatus for forming fins on a tube outer side, which fins run circumferentially about the tube in a continuous fashion with the outer ends of the fins approaching the outer ends of adjacent fins forming a chamber between adjacent fins, including:
- support means for said tube;
- rolling disc means for forming a finned tube, said rolling disc means rotating relative to said tube and including a plurality of rolling discs of successively increasing diameters rotating about an axis of said rolling disc means;
- means for notching the upper surface of the formed fins, said means for notching including a plurality of notching discs located between at least some of said rolling discs so that the rolling and notching discs are arranged in an alternating sequence.
Apparatus for forming fins on a tube outer side, which fins run circumferentially about the tube in a continuous fashion with the outer ends of the fins approaching the outer ends of adjacent fins forming a chamber between adjacent fins including:
- support means for said tube;
- rolling disc means for forming a finned tube, said rolling disc means rotating relative to said tube and including a plurality of rolling discs of successively increasing diameters rotating about an axis of said rolling disc means;
- means for notching the upper surface of the fins as they are being formed, said notching means including a plurality of notching discs arranged in alternating fashion between said rolling discs;
- bending roller means for bending the notched fins into Y-fins;
- flattening roller means for flattening the Y-fins into T-fins.
Apparatus for forming fins on a tube outer side, which fins run circumferentially about the tube in a continuous fashion with the outer ends of the fins approaching the outer ends of adjacent fins forming a chamber between adjacent fins including:
- a plurality of tool holders arranged at the circumference of the tube in staggered relation to each other;
- each tool holder including a plurality of alternating rolling and notching discs;
- at least one tool holder including a bending roller coaxially mounted with the rolling and notching discs.
Apparatus for forming fins on a tube outer side, which fins run circumferentially about the tube in a continuous fashion with the outer ends of the fins approaching the outer ends of adjacent fins forming a chamber between adjacent fins including:
- a plurality of tool holders arranged at the circumference of the tube in a staggered relation to each other;
- each tool holder including a plurality of alternating rolling and notching discs;
- at least one tool holder including a bending roller co-axially mounted with the rolling and notching discs, said bending roller being arranged subsequent to said notching and rolling discs;
- at least one tool holder including a flattening roller.
A process for forming fins on a tube outer side which fins run circumferentially about the tube in a continuous fashion with their outer ends approaching the outer ends of adjacent fins forming a chamber between adjacent fins including the steps of:
- displacing the material making up the tube wall in an outward direction by means of a rolling process, said rolling process being carried out by means of rolling discs positioned at the circumference of the tube;
- notching the ends of the fins as they are being formed, said notching step being effected by means of a plurality of notching discs co-axially mounted in an alternating fashion with said rolling discs;
- bending the ends of the notched fins into Y-fins, said bending step being effected by means of a bending roller mounted subsequent to said rolling and notching discs.
Dependencies are inferred from the claim text.