| CPC B01F 35/31 (2022.01) [B01F 27/91 (2022.01); B01F 2035/351 (2022.01)] | 11 Claims |
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1. A stirring device comprising:
a stirring tank that defines a stirring chamber;
a circulating impeller that is disposed in the stirring chamber;
a drive shaft that extends from a lower side of the stirring tank to an inside of the stirring chamber and rotationally drives a shear blade;
a mechanical seal structure that is disposed radially outside the drive shaft and creates a seal between the stirring tank and the drive shaft,
a drainage path for guiding a liquid discharged radially outward from the mechanical seal structure to a drainage portion; and
a spacer;
wherein the drive shaft includes:
a first portion to which the shear blade is fixed, and
a second portion that has a larger diameter than the first portion and is provided below the first portion,
wherein the mechanical seal structure includes:
a fixed ring provided in the vicinity of the lowermost portion of the stirring chamber, which includes an inner peripheral surface forming a radial gap between an outer peripheral surface of the first portion of the drive shaft,
a rotating ring attached to the second portion of the drive shaft and disposed below the fixed ring, which includes a top surface facing a bottom surface of the fixed ring, and
a spring that urges the rotating ring upward against the bottom surface of the fixed ring to form a sealing surface between the top surface of the rotating ring and the bottom surface of the fixed ring;
wherein the spacer is disposed between the inner peripheral surface of the fixed ring and the first portion, and is attachable to and detachable from the drive shaft; and
wherein the spacer widens at its base to substantially fill the space between the inner peripheral surface and the first portion.
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