Device for admixing a first fluid into a second fluid

Details Device for admixing a first fluid into a second fluid Device for admixing a first fluid into a second fluid

1997-10-09

2001-07-03

Look, Edward K. (Department: 3745)

Rotary kinetic fluid motors or pumps

With diversely oriented inlet or additional inlet for...

C415S198100, C415S206000, C415S216100, C366S169100

Reexamination Certificate

active

06254335

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a device for mixing a first fluid into a second fluid, comprising a housing with a rotationally symmetrical rotation chamber having an inlet for the second fluid and an outlet for the mixed fluids, the internal diameter of the housing decreasing continuously from the inlet to the outlet in at least one section of the rotation chamber converging in the direction towards the shaft, and also means for setting the second fluid in rotation along the inner wall of the rotation chamber.
PRIOR ART
In the chemical pulp industry it is extremely common to admix different fluids into pulp suspensions at different stages in the process, for example chlorine dioxide or other bleaching agents in liquid or gaseous form in a bleaching department chain. In pressurized systems, such as these are, it has been found to be difficult to supply and admix these fluids, especially in gaseous form, since they are difficult to pressurize to system pressures, which may be up to
10
bar overpressure. To make the admixing easier, it would be desirable to reduce the pressure at the point of addition. However, since the pressure across a mixer device should preferably not change appreciably, it would be necessary to raise the pressure again after the said pressure reduction. To this day, as far as the inventors are aware, no device has been produced which is able to do this.
DESCRIPTION OF THE INVENTION
The object of the present invention is to overcome the difficulties encountered when admixing gas, in particular, in pressurized systems. This object is achieved by a device of the type mentioned in the introduction, which is characterized by means for adding the first fluid into the vortex which is formed when the second fluid is rotating in the said chamber. Further characteristics and aspects of the invention will be evident from the patent claims and from the following description of a preferred embodiment.


REFERENCES:
patent: 4388045 (1983-06-01), Simon
patent: 5385443 (1995-01-01), Dufour
patent: 5711852 (1998-01-01), Ekholm et al.
patent: 5863120 (1999-01-01), Gallagher et al.
patent: 0320480 A1 (1989-06-01), None

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