Improvements in and connected with Steam Generators and their Furnaces, chiefly applicable to Road Carriages or Vehicles and the like.
Year: 1896

page_text: Date of Application, 29th May, 1896
Complete Specification Left. 29th Mar., 1897-Accepted. 22nd May, 1897
PROVISIONAL SPECIFICATION.
Improvements in and connected with Steam Generators and their
Furnaces, chiefly applicable to Road Carriages or Vehicles and
the like.
I, PRESTON DAVIES, of Spencer House, West Hill Road, Southfields, in the
County of Surrey, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to generators chiefly designed for road carriages or vehicles,
but which is also applicable for other purposes, and comprises the improved
apparatus hereinafter described.
The main object of my said invention is to provide a generator which whilst
occupying a very limited space will at the same time afford an extensive heating
surface. A further important feature in my said invention is the provision of means
whereby naphtha or other volatile liquid suitable for use as fuel and having a lower
point of vaporization than water will, when the apparatus is in work, become
vaporized by the heat of the generator and injected or delivered into the furnace
or combustion chamber beneath the boiler where it is to be consumed for heating
purposes.
According to my said invention I provide a cylindrical or other casing having a
second casing or jacket at a certain distance therefrom so as to form an annular
space wherein I place the naphtha or other volatile liquid intended for fuel. Upon
or at the upper end of this annular casing I fix a hollow ring, which latter
communicates with a conical shaped vessel placed centrally and apex downwards
within the space contained or enclosed by the annular casing, and which conical
vessel is suspended by, and communicates through a set or series of tubes with, the
above mentioned hollow ring. The hollow ring is intended to form a steam space or
dome, the tubes and conical vessel form the water or liquid space of the boiler,
and the space contained or enclosed by the anuular casing forms the furnace or
combustion chamber of the generator. The feed water or other liquid is preferably
introduced into the water or liquid space at a point near the lower extremity of
one or more of the tubes, and the normal water level in the latter might
advantageously be situated at a point about three quarters of their length.
To introduce the vaporized liquid fuel into the furnace or combustion chamber
I provide pipes leading from near the upper part of the annular casing at two or
more points opposite each other. These pipes pass through the lower part of the
said casing and their free extremities terminate in nozzles so situated as to impel
the blow-pipe flames that would result from the burning vapour against the herein-
before mentioned conical shaped vessel, after impinging against which they would
take an upward course, and having passed between and enveloped the tubes
connecting the said conical vessel with the hollow steam ring or space, would
finally pass away to the uptake through the central aperture in the latter.
To start the apparatus it will be necessary to apply sufficient preliminary heat,
from some independent source, to the annular casing to effect the vaporization of
the naphtha or other volatile liquid contained therein. This might conveniently
be effected by burning a certain portion of the said. naphtha or other liquid, or
spirit in a pan or tray placed in the bottom of the space enclosed by the annular

page_text: casing and beneath the conical vessel; or a suitable lamp, or any other convenient
means, might be employed for generating such heat.
I find it desirable moreover to provide for automatically regulating the supply
of feed water to the generator, as also that of the vapour to the burners, so as to
maintain when in use a constant, or as nearly so as practicable, pressure of steam
as also water level in the generator. A convenient method of regulating the feed
water and vapour supply is by means of valvės so arranged that the first set which
governs the feed water supply will be closed to a greater or lesser extent upon a
fall of the water in the generator below the normal level, or will be opened in like
manner upon a rise of the said water beyond the normal level; and that the
second set governing the vapour supply to the combustion chamber will be
more or less opened for the admission of a larger supply of vapour upon a fall
of the steam pressure in the generator below the predetermined or normal point,
and will be more or less closed to reduce such supply of vapour upon a fall of the
said steam pressure below the said predetermined or normal point."
Dated this 29th day of May 1896.
A. F. SPOONER,
124 Chancery Lane, W.C., Agent for the. Applicant.
Improvements in and connected with Steam Generators and their
Furnaces, chiefly applicable to Road Carriages or Vehicles and
the like.
I, PRESTON DAVIES, of Spencer House, West Hill Road, Southfields, in the
County of Surrey, 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:-
My invention relates to generators chiefly designed for road carriages or
vehicles, but which are also applicable for other purposes, and comprises the
improved apparatus hereinafter described.
The main object of my said invention is to provide a generator which whilst
occupying a very limited space will at the same time afford an extensive heating
surface. A further important feature in my said invention is the provision of
meaus whereby naphtha or other volatile liquid suitable for use as fuel and having
a lower point of vaporization than water will, when the apparatus is in work,
become vaporized by the heat of the generator and injected or delivered into the
furnace or combustion chamber beneath the boiler where it is to be consumed for
heating purposes.
In the accompanying drawings I have shown in vertical central section how my
said invention may be conveniently and advantageously carried into practice.
b
According to my said invention I provide a cylindrical or other casing a having
a second casing or jacket a' at a certain distance therefrom so as to form an
annular space wherein I place the naphtha or other volatile liquid intended for
fuel. Upon or at the upper end of this annular casing I fix a hollow ring c, which
latter communicates with a conical shaped vessel d placed centrally and apex
downwards within the space contained or enclosed by the annular casing a, and
which conical vessel d is suspended by, and communicates through a set or series
of tubes e, e with the above, mentioned hollow ring. The hollow ring c is intended
to form a steam space or dome, the tubes e and conical vessel d form the water or
liquid space of the boiler, and the space f contained or enclosed by the annular
casing a forms the furnace or combustion chamber of the generator. c' is the

page_text: steam pipe for conducting the steam from the steam space or dome c to the engine
or the like. d is a blow-off pipe fitted with a suitable stop valve for blowing off
sediment or dirt from the couical vessel d. The feed water or other liquid is
preferably introduced into the water or liquid space through one or more tubes g
entering the lower extremities of one or more of the tubes e, and the normal water
level in the latter might advantageously be situated at a point about three quarters
of their length as shown. I prefer to secure a sufficient number of the tubes e in
their tube plates by means of nuts so as to form stay tubes. I may however
provide for strengthening this, as well as other portions, of the boiler by means of
any other convenient arrangement of stays or the like.
To introduce the vaporized liquid fuel into the furnace or combustion chamber
I provide pipes leading from near the upper part of the annular casing a' at two
or more points opposite each other. These pipes pass through the lower part of
the said casing and their free extremities terminate in nozzles ¹ so situated as to
impel the blow-pipe flames that would result from the burning vapour against the
herein before mentioned conical shaped vessel d, after impinging against which they
would take an upward course, and having passed between and enveloped the tubes e
connecting the said conical vessel with the hollow steam ring or space c, would
finally pass away to the uptake i through the central aperture in the said hollow
steam ring c, as indicated on the drawing by the arrows.
To start the apparatus it will be necessary to apply sufficient preliminary heat,
from some independent source, to the annular casing to effect the vaporization of
the naphtha or other volatile liquid contained therein. This might conveniently
be effected by burning a certain portion of the said naphtha or other liquid, or
spirit in a pan or tray placed in the bottom of the space enclosed by the annular
casing and beneath the conical vessel, or a suitable lamp, or any other convenient
means, might be employed for generating such heat.
To force the boiler I may provide for the use of more blow pipe tubes than
would be used during normal work.
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. A steam boiler or generator wherein the liquid fuel is enclosed in an annular
or other casing forming the wall of the furnace, is vapourized by the heat of the
latter, and is discharged in the form of gas into the combustion chamber,
substantially as specified.
2. A steam boiler or generator wherein the liquid fuel is enclosed in an annular
or other casing, forming the wall of the furnace, is vapourized by the heat of the
latter, and is discharged in the form of gas into the combustion chamber, the flames
from the latter impinging against a conical shaped vessel connected to an annular
steam dome or ring by a set or series of tubes, which vessel together with a portion
of the said tubes form the water space of the boiler, substantially as specified.
3. The improved steam boiler or generator constructed substantially as described
with reference to the accompanying drawing.
Dated this 20th day of March 1807
A. F. SPOONER,
323, High Holborn, London, Agent for the Applicant.