Improvements in or relating to Steam Boiler Furnaces for Motor Cars.
Year: 1896

page_text: Date of Application, 3rd Dec., 1896
Complete Specification Left, 3rd Sept., 1897-Accepted, 9th Oct., 1897
PROVISIONAL SPECIFICATION.
Improvements in or relating to Steam Boiler Furnaces for Motor
Cars.
We, HERBERT CHURCHILL CAPEL, of 168 Dalston Lane, in the County of
Middlesex, Engineer, and THOMAS CLARKSON of Grove Villa, Carshalton Grove,
Sutton, in the County of Surrey, Engineer, do hereby declare the nature of this
invention to be as follows:-
In motor cars where the boiler is heated by oil flames it is very difficult to
obtain a sufficient but regular and not too strong supply of air to support combus-
tion, and for this purpose our present invention is designed.
In practice we provide an air-collection chamber from which the furnace draws
its supply, and in this chamber or in advance of it we employ a number of
perforated screens which may be made of perforated metal, wire gauze tubes or
other suitable medium, through which the air can freely pass, and be split up
into many tiny currents. Where necessary the entrance or entrances to the
collection chamber may be protected by conical shields or guards, having their
narrow ends facing the air supply, so that the velocity of the current may diminish
in proportion to the increasing area of the shield. The chamber may be placed
in any convenient relation to the furnace, and may surround it if desired.
Similar means may be employed at the exit as undue suction or retarding of the
escape would be as deleterious at the exit as at the entrance. Une or more
dampers, throttles or equivalent may be used and these are preferably connected
so as to operate automatically with the device which controls the supply of fuel to
the burners.
The incoming air may be heated, if desired, either by the exhaust steam or
otherwise.
A forcing or suction fan or equivalent device may be employed, not as a means
of forcing combustion in the ordinary sense of the term "forced draught," but
merely as a regulator which would sometimes supply additional air and some-
times when too much was blowing in-would act in the opposite sense and
prevent the entrance of air, thus equalizing the current and ensuring an even
air supply to the furnace.
Dated this 3rd day of December 1896.
BOULT & WADE,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in or relating to Steam Boiler Furnaces for Motor
Cars.
We, HERBERT CHURCHILL CAPEL, of 168 Dalston Lane, in the County of
Middlesex, Engineer, and THOMAS CLARKSON of Grove Villa, Carshalton Grove,
Price 8d1

page_text: Sutton, 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:-
In motor cars where the boiler is heated by oil flames it is very difficult to obtain
a sufficient but regular and not too strong supply of air to support combustion,
and for this purpose our present invention is designed.
In practice we provide an air-collection chamber from which the furnace draws
its supply, and in this chamber or in advance of it we employ a number of
perforated screens which may be made of perforated metal, wire gauze tubes or
other suitable medium, through which the air can freely pass, and be split up
into tiny currents. Where necessary the entrance or entrances to the collection
chamber may be protected by conical shields or guards, having their narrow ends
facing the air supply, so that the velocity of the current may diminish in propor-
tion to the increasing area of the shield. The chamber may be placed in any
convenient relation to the furnace, and may surround it if desired. Similar means
may be employed at the exit as undue suction or retarding of the escape would be
deleterious at the exit as at the entrance. One or more dampers, throttles or
equivalent may be used and these are preferably connected so as to operate
automatically with the device which controls the supply of fuel to the burners.
The incoming air may be heated, if desired, either by the exhaust steam or
otherwise.
as
A forcing or suction fan or equivalent device may be employed, not as a means
of forcing combustion in the ordinary sense of the term "forced draught," but
merely as a regulator which would sometimes supply additional air and some-
times when too much was blowing in--would act in the opposite sense and prevent
the entrance of air, thus equalizing the current and ensuring an even air supply
to the furnace.
In the accompanying drawings,
Figure 1 is a diagrammatic sectional elevation of a steam boiler and its furnace
provided with the improved arrangement.
Figure 2 is a similar view of a modification.
Figure 3 is a diagrammatic section on the line 3-3 of Figure 2.
Like letters indicate like parts throughout the drawings.
The boiler A with its furnace B is preferably arranged at the rear of the motor
vehicle, only the casing of these parts is however shown in the drawings, the
details of construction not being of importance in this invention.
A box or casing C which forms the air-collecting chamber is placed on the front
side of the furnace, an extended portion C of the chamber running beneath the
furnace. The front wall C of the air collecting chamber is perforated and
provided with a series of short tubes D. These tubes are conical and placed with
their smaller ends on the exterior, the object of which is to reduce the velocity of
the air entering the chamber C. Within the latter are placed one or more gauze
or perforated screens or baffles E in order to equalise the velocity of the air which
passes into the chamber C' beneath the furnace and so to the burners of the latter.
Between the chamber C and the collecting chamber C may be arranged a
damper F which may either be a single hinged flap or may be composed of several
such flaps. This damper is operated or controlled by the movement of the
regulator which controls the supply of fuel to the burners.
Upon the top of the boiler is arranged a casing or chamber G provided in its
rear wall G with conical tubes D. The products of combustion enter this
chamber G and pass thence into the air. If desired gauze or perforated screens
may also be arranged in the chamber G as in the chamber C.
As a means of ensuring a continuous and steady supply of air to the furnace a
fan may be placed within the casing G on the top of the boiler, the casing
preferably being arranged as shown in Figures 2 and 3. A spindle H, driven
from the engine in some convenient manner, runs through the casing from end to

page_text: end, being carried in suitable bearings. Upon this spindle are keyed one or more
fans J on either side of each of which are situated partitions K in which are
openings K. The products of combustion are drawn up into the spaces between
the fans, that is between the partitions K, and thence sucked through the
openings K' and expelled into the air from the fan chambers.
By employing this arrangement of fans in conjunction with the air-collecting
box above described a steady supply of air may be ensured irrespective of the
condition of the weather.
In the modification illustrated in Figures 2 and 3 the damper F is shown as a
balanced one in place of a simple hinged flap as shown in Figure 1. It is of
course to be understood that other forms of damper may equally well be employed.
If desired the steam exhaust pipe may be led through the air-collecting box C
in a coil or other convenient form and thence to the condenser. By this means a
preliminary condensation or cooling of the steam is obtained while the air supply
to the furnace is correspondingly warmed.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that what
we claim is :-
1. The combination with an oil or vapour burner of an air-collecting chamber
such as C C C with or without means for heating the incoming air substantially
as described.
2. The combination with an oil or vapour burner for the steam boiler of a
motor-car of an air-collecting chamber such as C C C and a casing such as G G¹
through which the products of combustion pass substantially as described.
3. In an oil or vapour burner for the steam boiler of a motor-car the combina-
tion with an air-collecting chamber of conical tubes such as D in the wall thereof
with or without screens or baffles E substantially as described.
4. Controlling the air supply of an oil or vapour burner by an automatic
regulator which governs the supply of fuel to the burner.
5. In an oil or vapour burner the combination with an air-collecting chamber
of a damper automatically controlled by the regulator governing the supply of
fuel to the furnace substantially as described.
6. In an oil or vapour burner for the steam boiler of a motor-car the combination
with an air-collecting chamber of one or more fans for controlling the draught to
the furnace substantially as described.
7. The complete apparatus for regulating the supply of air to the steam boiler
furnace of a motor-car substantially as described and illustrated in Figure 1 or
Figures 2 and 3 of the accompanying drawings.
Dated this 2nd day of September 1897.
T. CLARKSON,
Boult & Wade,
Agents for the Applicants.