Mixing apparatus
US4896971A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1987 |
| Grant date | Jan 30, 1990 |
| Priority date | — |
| Expiry date | Mar 26, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01F27/191
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A mixer which provides axial flow in a non-uniform flow field, such as may be established by gas which is sparged into a medium being mixed in a tank, and provides large axial flow volume without flooding and withstands variable loads on the blades thereof, thereby providing for reliable operation. The mixer impeller is made up of paddle shaped blades, which near their tips (e.g., at 90% of the radius of the impeller from its axis of rotation) are of a width at least 40% of the impeller'a diameter. The blades also having camber, twist and flat sections. The flat sections being at least in the center area of the base of the blades. The hub for attaching the blades to the shaft of the mixer has radially extending arms with flat surfaces. The base of the blades are spaced from the shaft to define areas therebetween. These areas are reduced in size, thereby limiting the passage of sparging gas between the blades and the shaft and the strength of the coupling between the blades and the shaft are enhanced by backing plates of width greater than the width of the arms. These backing plates are fastened between the arms and the flat sections of the blades. Bolts extending through aligned ho…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.