APPARATUS FOR PROMOTING CIRCULATION OF WATER IN STEAM BOILERS
Year: 1884

page_text: I JAMES KEILLER of Gothenburg in the Kingdom of Sweden, Engineer do
hereby declare the nature of my said invention for "APPARATUS FOR PROMOTING
CIRCULATION OF WATER IN STEAM BOILERS" and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement:
In steam boilers considerable differences of temperature obtain in the water and
consequently also in the plates in different parts according as they are above or
below the source of heat.
Such differences of temperature occur in various constructions of boilers, for
example, in a tubular ship boiler the water above the grate will have a higher
temperature than the water below the source of heat and in a cornish boiler the
water above upper portion of the tube forming the crown of the furnace and flue
being acted upon directly by the products of combustion will have a higher
temperature than the water and plates in the lower portion of the same boiler.
These marked differences of temperature cause unequal expansion and contrac-
tion of the boiler plates and consequent leakage at the rivets and joints, and are
liable ultimately to render it impossible to keep the boiler tight.
Now this invention is designed to obviate these evils by providing mechanical
means whereby circulation of the water in a boiler may be ensured, as required, in
such a way as to equalize or approximately equalize the temperature of the water
throughout the boiler. For this purpose there is provided an agitator carried and
operated by a shaft or spindle that protrudes through the shell of the boiler and
can be actuated in a rotary sense from without by hand through the medium of a
crank handle or it may be driven by other power. A stuffing box is provided so
that the shaft or spindle may be packed to prevent leakage where it passes
through the boiler shell. The agitator is constructed with blades which may be.
arranged in any convenient manner as for instance like those of a paddle wheel,
but the arrangement preferred is with a screw such as represented in the annexed
sheet of drawings.
°
Fig 1 shews in longitudial section an arrangement wherein the shaft or spindle
is at an angle of about 45° to the boiler shell as seen in this view. Fig 2 shews
in elevation the stuffing box and part of the tubular guide. Fig 3 illustrates a

page_text: modification in which the shaft or spindle is at right angles to the boiler shell as
seen in this view.
A is a shaft or spindle carrying at one end a boss B with blades screw shaped C
or otherwise, and at its other end a crank handle D. This shaft passes through a
stuffing box E provided with a tubular extension F forming a guide or bearing for
the shaft or spindle A. A collar A' on the shaft or spindle by contact with the
shoulder of the stuffing box prevents the shaft or spindle moving end wise towards
the interior of the boiler and in conjunction with a washer G prevents also endwise
movement of the shaft or spindle in the contrary direction. The stuffing box is
provided with a flange E* secured in any convenient manner to the shell of the
boiler.
As will be evident, by turning the shaft or spindle the blades will be caused to
agitate the water in the boiler.
Instead of employing rotating blades, the shaft may be caused to impart to and fro.
movement to blades suitably mounted in the boiler, as will be readily understood.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:
The use for causing or promoting circulation of water in a steam boiler of
apparatus comprising blades situate within the boiler and a shaft for actuating
them the arrangement and operation being substantially such as herein above
described and illustrated.