Method of forming, inserting and permanently bonding ribs in boiler tubes
US8350176B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2008 |
| Grant date | Jan 8, 2013 |
| Priority date | — |
| Expiry date | Oct 12, 2031 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF22B37/103
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A method of providing boiler tubes with a variably ribbed interior surface. A suitably dimensioned spindle with a channel having a desired pattern on the exterior surface of the spindle is wrapped by a wire-like member in the channel so as to form thereon a reverse image of the desired, patterned tube ribbing. A brazing metal paste is applied on the exterior surface of the wire-like member and the spindle is inserted into a tube to be ribbed. The wire-like member is released from the spindle to allow the wire-like member to conform to the inner surface of the tube, and the tube is heated to the melting temperature of the brazing metal paste so that the wire-like member bonds to the inner surface of the tube, and the metal tube is then cooled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.