Agitating – Stirrer within stationary mixing chamber – Rotatable stirrer
Reexamination Certificate
1999-01-07
2001-03-13
Soohoo, Tony G. (Department: 1723)
Agitating
Stirrer within stationary mixing chamber
Rotatable stirrer
C403S273000, C422S228000
Reexamination Certificate
active
06200016
ABSTRACT:
The present invention relates to a baffle assembly for disrupting flow in a mixing vessel. Generally, the invention relates to disruption baffles in reactor vessels used in the chemical processing industry. Such vessels and baffles are often glass or enamel coated but may also be made of refined stainless steels.
FIG. 1
a
shows a conventional standard vessel used for example in the chemical or pharmaceutical industry for various operations such as reacting, mixing, gasification, stirring, etc. Due to the potentially corrosive or abrasive ingredients mixed, such vessels are often designed to have a glass coating on all components exposed to the materials being treated. As shown in
FIG. 1
a
, the vessel wall
2
, the blade agitator
1
and the baffle member
4
are all coated with glass or enamel layers as is well known in the present art. The conventional baffle assembly shown in
FIG. 1
a
comprises the elongate baffle member
4
fixed to a flange
5
, the flange
5
being connected by conventional means to the vessel port
6
. Alternatively, conventional baffles are secured to the vessel port
6
in a stuffing box type arrangement. Sealing members of the stuffing box are urged into sealing engagement with the external surface of the baffle member. The flange assembly is applied from above the vessel, while the baffle member is inserted from within the vessel into the vessel port
6
.
FIG. 1
b
shows another conventional baffle assembly as disclosed in the European Patent EP-B 0 614 694. The baffle
4
comprises an outer tube with an inner tube
7
disposed coaxially therein. The inner tube
7
can carry sampling means as shown in
FIG. 1
b
in the form of a plastic pipe
8
extending from the bottom of the double tube construction. This conventional baffle also comprises temperature sensor means located between the inner and outer tube walls as shown at reference numeral
9
.
The conventional baffles of
FIG. 1
are assembled by insertion from the top of the vessel through the port
6
and subsequent fixation of the flange
5
to a counter flange of the port
6
. Such baffles are inserted in inclined manner when the diameter of the port allows, however, considerable overhead space must be present at the assembly site. In addition, the cross-sectional dimensions of the baffle member cannot exceed the inner diameter of the port
6
.
An object of the present invention is to provide an improved baffle assembly which minimizes overhead space requirements and allows flexibility in the selection of the shape and size of the baffle member itself.
According to the present invention, a baffle assembly is provided for flow disruption in a mixing vessel as defined in claim
1
. The elongate glass coated baffle member has a hollow end for interconnection to a connector piece. The connector has a glass coated tubular portion and is adapted to be secured to the mixing vessel. The hollow end of the baffle and the tubular portion of the connector engage coaxially in a frictional fit. The frictional engagement is provided by an interference fit connection.
Employing the present baffle assembly, the baffle member as a separate part can be placed inside the vessel through the manhole. Larger dimensions and various configurations of the baffle can therefore be employed. The hollow end of the baffle may be extended from the inside of the vessel into the port opening and connected to the connector piece assembled from above. The overhead space required is only that necessary to attach the connector to the hollow end of the baffle extending through the port. The releasable frictional fit of the baffle member and the connector therefore allow complete flexibility in the selection of the baffle configuration.
Further objects and advantages of the present invention will become apparent from the following description of embodiments taken in conjunction with the drawings.
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patent: 3229629 (1991-10-01), None
Amorese Franklyn J.
Reinemuth Jurgen
Dunn Michael L.
Pfaudler-Werke GmbH
Soohoo Tony G.
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