Improvements in Impeders, Deflectors, or Heat Retaining Devices for Heating Tubes, Flues, and the like.
Year: 1898

page_text: Date of Application, 17th Oct., 1898-Accepted, 23rd Dec., 1898
Improvements in Impeders, Deflectors, or Heat Retaining Devices
for Heating Tubes, Flues, and the like.
I, CHARLES HERBERT WEST, of 5, Castle Street, Liverpool, in the County of Lancaster,
Engineer, do hereby declare the nature of this invention and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement :—
This invention has for its object an exceedingly simple and cheap device for
impeding the flow of heating fluids through tubes, and causing them to impinge
upon the sides thereof.
It is best described by aid of the accompanying drawings, which show my latest
form of device, in which
Figure 1 is an elevation thereof; and
Figure 2 a plan.
B
In these A is a dise of wrought iron. It can however be made of other metal.
three wings or guides stamped out of the same sheet of metal and bent at right
angles. The number of these wings is arbitrary. Four would do equally well, and
in an actual experiment which I have tried on a boiler they were formed with four
wings, but as these gave rather more impediment than three wings, and three wings
will hold the disc quite as well, I prefer three wings. The form of disc A too and
even the wings may be varied; in some instances the wings may be twisted to one
side so as to form a helix and thus cause the draught to take a rotary motion in the
tube.
In cutting the blank I form the wings as tangential arms standing out as rays
from a circle. When they are bent therefore at right angles they form the requisite
shape. If however they are to be bent to the screw form, instead of being quite
tangential they may be slightly more radial. The arms are preferably rounded at
their outer edges so as more easily to enter the tube as shown at C. In some cases
where it is desirable that a spiral motion should be given to the fluid, the disc also is
formed spirally, being sheared to the centre or beyond the centre and then bent in
the form of a spiral. The parts cut away to form the spiral instead of being entirely
detached, are preferably bent down so as to form guides or wedging devices to hold
the spiral in position in the tube. Where the impeder is to take the form of an
annulus pressing against the sides, the deflector can be cut in the form of a ring with
starlike rays.
These rays are then bent to form the guides. In actual use, one or
several of these impeders are placed in each tube and are made preferably a
tight fit.
Although I have described my invention as made of wrought iron or other like
metal, it can be made of brass, copper, or even of malleable or ordinary cast iron.
In that case however it is made rather stouter; on the whole however for nearly all
purposes wrought iron is the best.
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:-
1. An impeder, deflector or heat retaining device for the interiors of tubes, formed

page_text: out of a single flat plate or blank of metal bent to the required shape substan-
tially as described.
2. The various forms or 'modifications of impeders, substantially as herein
described.
Dated this 14th day of October 1898.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.