Tube having grooved inner surface and its production method
US6336501B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1999 |
| Grant date | Jan 8, 2002 |
| Priority date | — |
| Expiry date | Dec 21, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49382
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A tube having a grooved inner surface capable of achieving high condensing performance and high evaporating performance even in a region of a small flow rate of a refrigerant and preferable as a heat exchanger tube for a condenser as well as an evaporator and its fabrication method, wherein spiral groove fabricating zones 1 formed with spiral grooves are arranged at an inner surface of a metal or an alloy tube and intersecting groove fabricating zones 2 formed with intersecting groove groups intersected with pluralities of grooves are arranged at the inner surface of the metal or the alloy tube at regions different from each other, singles or pluralities of the spiral groove fabricating zones 1 and the intersecting groove fabricating zones 2 are alternately arranged in a tube circumferential direction of the metal or the alloy tube, when a fabrication width of the spiral groove fabricating zone 1 in the tube circumferential direction is designated by W1 and a fabrication width of the intersecting groove fabricating zone 2 is designated by W2, a ratio W1/W2 of W1 to W2 falls in a range of 1.1 through 3.0 and the ratio W1/W2 can also be made to fall in a range of 0.3 through 0.9.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.