Heat transfer pipe with grooved inner surface
US8091615B2 · kind B2 · utility
8Cited by
13References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2006 |
| Grant date | Jan 10, 2012 |
| Priority date | — |
| Expiry date | Mar 14, 2030 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF28F1/40
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A heat transfer pipe 21 with grooved inner surface is provided with a pipe body 22 having a pipe axis line ◯ as a center axis line, a plurality of first fins 23 each having a fin height Hf, formed by providing a plurality of spiral grooves 200 at an inner surface of the pipe body 22 along the pipe axis line ◯ and at least a second fin 24 having a fin height hf, provided at a groove bottom of at least one of the spiral groove 200. The fin height hf and a torsion angle α of the second fin 24 are determined respectively to satisfy the following conditions:Hf/15≦hf≦Hf/3 and α=β,
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.