Stirrer

Patent metadata

Field	Value
Publication number	US-9744505-B2
Application number	US-201514840799-A
Country	US
Kind code	B2
Filing date	Aug 31, 2015
Priority date	Sep 10, 2010
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A stirrer having a motor; a hollow shaft that is drivable via the motor and is provided with at least one additive outlet opening, via which an additive passed through the hollow shaft can be discharged; and a rotor arranged on the hollow shaft and having rotor blades, characterized in that a second rotor having rotor blades is provided on the hollow shaft at a distance from the first rotor, and in that the at least one additive outlet opening is provided between the two rotors, wherein the rotors are designed and drivable such that, during operation, a negative pressure and a centrifugal force are generated in the intermediate space defined between the rotors.

First claim

The invention claimed is:

1. A stirrer comprising:
a shaft disposed at least partially within a medium;
a first rotor having a first rotor blade and a second rotor blade each attached to the shaft, wherein the first and second rotor blades are spaced apart from one another about a circumference of the shaft so as to define a gap between the first and second rotor blades, and wherein the first rotor is configured when driven to draw the medium from above the first rotor through the gap between the first and second rotor blades;
a second rotor spaced axially along the shaft from the first rotor so as to define an intermediate space between the first and second rotors, the second rotor having a third rotor blade and a fourth rotor blade each attached to the shaft, wherein the third and fourth rotor blades are spaced apart from one another about a circumference of the shaft so as to define a gap between the third and fourth rotor blades, and wherein the second rotor is configured when driven to draw the medium from below the second rotor through the gap between the third and fourth rotor blades; and
a first additive outlet opening, defined by the shaft, at the intermediate space between the first and second rotors.

2. The stirrer of claim 1 , further comprising a second additive outlet opening defined by the shaft at the intermediate space between the first and second rotors, wherein the second additive outlet opening is spaced from the first additive outlet opening about the circumference of the shaft.

3. The stirrer of claim 1 , further comprising:
a motor configured to drive the shaft, wherein the shaft defines a first axial end portion and a second axial end portion opposite the first axial end portion, wherein the motor is coupled to the shaft at or near the first axial end portion and the first, second, third, and fourth rotor blades are attached to the shaft at or near the second axial end portion disposed within the medium, and wherein the first, second, third, and fourth rotor blades extend out from the shaft.

4. The stirrer of claim 3 , further comprising:
a feed tube extending within the shaft from the first axial end portion to the second axial end portion, wherein the shaft and feed tube are configured to be non-co-rotating.

5. The stirrer of claim 4 , wherein the feed tube terminates in the second axial end portion of the shaft at the first additive outlet opening.

6. The stirrer of claim 1 , wherein the first and second rotor blades are attached to the shaft at a first angle in a first direction with respect to the shaft, and wherein the third and fourth rotor blades are attached to the shaft at a second angle in a second direction with respect to the shaft, the second direction being generally opposite the first direction.

7. The stirrer of claim 1 , wherein the first additive outlet opening is an elongate cutout extending in a direction of a longitudinal axis of the shaft.

8. A stirrer comprising:
a shaft disposed at least partially within a medium;
a first rotor having a first rotor blade and a second rotor blade each attached to the shaft, wherein the first and second rotor blades are spaced apart from one another about a circumference of the shaft so as to define a gap between the first and second rotor blades, and wherein the first rotor is configured when driven to draw the medium from above the first rotor through the gap between the first and second rotor blades;
a second rotor spaced axially along the shaft from the first rotor so as to define an intermediate space between the first and second rotors, the second rotor having a third rotor blade and a fourth rotor blade each attached to the shaft, wherein the third and fourth rotor blades are spaced apart from one another about a circumference of the shaft so as to define a gap between the third and fourth rotor blades, and wherein the second rotor is configured when driven to draw the medium from below the second rotor through the gap between the third and fourth rotor blades, and wherein the first and second rotors are configured when driven to push the medium radially outward from the intermediate space; and
a first outlet located at the intermediate space between the first and second rotors to deliver an additive between the first and second rotors.

9. The stirrer of claim 8 , wherein the first outlet is defined by the shaft at the intermediate space between the first and second rotors, and wherein the first and second rotors are configured when driven to draw the additive from the first outlet.

10. The stirrer of claim 9 , wherein the first and second rotors are configured when driven to push the medium and the additive radially outward from the intermediate space.

11. The stirrer of claim 9 , wherein the first outlet is an elongate cutout extending in a direction of a longitudinal axis of the shaft.

12. The stirrer of claim 8 , further comprising a second outlet located at the intermediate space between the first and second rotors, wherein the second outlet is spaced from the first outlet.

13. The stirrer of claim 8 , further comprising a feed tube extending within the shaft and terminating at a location of the first outlet, wherein the feed tube and the shaft are configured to be non-co-rotating.

Assignees

• Ecolab Usa Inc

Inventors

• Knauer Jochen Friedrich

Classifications

• B01F7/1625

  Operations & Transport · mapped topic

• B01F2215/0052

  Operations & Transport · mapped topic

• B01F7/00316

  Operations & Transport · mapped topic

• B01F7/22 Primary

  Operations & Transport · mapped topic

• B01F3/04539

  Operations & Transport · mapped topic