Year: 1896

page_text: JOHN HENRY KNIGHT Barfield Farnham Surrey Engineer and Landowner
do hereby declare the nature of this invention to be as follows:-
This invention relates to instantaneous steam generators or coil boilers. That is
boilers consisting of a tube bent into a spiral or coil, or a series of U shaped tubes
and heated in a furnace, or by gas, or by a petroleum blast, or any known device
of coil tube boiler in which water is pumped in at one end and steam almost
instantaneously taken off at the other.
To avoid the violent rush of water through the tubes, and consequently violent
production of steam when water is pumped into the heated coil I place in the tubes
a number of loose pieces such as balls, cylinders, or even a piece of bar metal.
These reduce the area of the tube and check the rush of water and cause the
generator to make steam more regularly.
These may be of any convenient form, but for a tube which is bent into a spiral
or coil I prefer to use balls or short cylinders, for straight tubes, or tubes bent to
a large radius bar metal may be used and even inserted in the tube before
bending.
If the balls or loose pieces are given a small amount of end movement they will
clear away any scale or deposit in the generator and permit it to be worked for a
longer period than would be the case if the tubes were not fitted with the internal
balls cylinders or metal bars.
The balls, cylinders or bars may be made hollow to save weight.
If bars are used they may be given a spiral twist before being placed in the
tube this will more readily check the rush of water through the tube and by the
movement of the internal bar, or bars more effectually clear the tube of
scale or deposit.
Doted this 22nd day of May 1896
JOHN HENRY KNIGHT of Barfield Farnham County of Surrey Engineer and
Landowner 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 relates to instantaneous steam generators, or coil boilers, that is
boilers consisting of a tube bent into a coil or spiral or a series of U shaped tubes,
and beated in a furnace or by a gas or petroleum blast, or any known device of coil
tube boiler; in which the water is pumped in at one end and steam almost
instantaneously given off at the other,

page_text: To avoid the violent rush of water through a plain tube and consequently violent
production of steam, when water is pumped into the heated coil; I place in the
tubes a number of loose pieces such as balls cylinders or even bar metal, these
reduce the area of the tube and check the rush of water and cause the generator
to steam more regularly. These pieces may be of any convenient form, but for a
tube which is bent into a spiral or coil I prefer to use balls, or short cylinders, for
straight tubes, or tubes of large curvature, bar metal may be used, and even inserted
in the tube before bending.
If the balls or loose pieces be given a small amount of end movement they will,
by their continual movement under the influence of the steam, clear away any
scale or deposit in the generator and permit it to be worked for a longer period
than would be the case if the tubes were not supplied with the internal balls,
cylinders, or metal bars.
These balls, cylinders, or bars, may be made hollow to save weight.
If loose bars of a rectangular or polygonal section be used they may be given a
spiral twist before being placed in the tube: they will thus more readily check the
rush of water through the tube, and by the movement of the said internal bar or
bars more effectually clear the tube of scale or deposit.
Figs. 1 & 2 are transverse and longitudinal sections of part of a tube so fitted,
viz. with balls and cylinders.
Figs. 3 & 4 represent a portion of a tube boiler with the spiral or twisted bar
mentioned above.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
1. Placing in a coil boiler or instantaneous steam generator pieces of metal, balls
or cylinders or bars, to reduce the area of the tube; and to check the violent rush
of steam.through the tube generator.
2. Giving these loose pieces end play so that by their action they may clear away
any deposit or scale.
3. The twisted or spiral bar as described above.
JOHN HENRY KNIGHT.