Improvements in Stoves.
Year: 1891

page_text: Date of Application, 5th Sept., 1891-Accepted, 10th Oct., 1891
COMPLETE FECIFICATION.
Improvements in Stoves.
I, ERNST AUGUst Wiman, Civil Engineer of Lastmakaregatan 9 Stockholm
in the Kingdom of Sweden, 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 fire places in which the fuel consists of petroleum or gas it is important that
the draught is maintained as constant as possible and independent of external
influences, and particularly that the gases of combustion created, may not, when
caused to flow in an opposite direction to that desired, mix with the air surrounding
the flame and support the combustion, as the flame would then be easily extinguished
by the said gases.
The arrangement which forms the subject of the present application has for its object
to fulfil the conditions of an undisturbed and uniform combustion of gas or petroleum
in fire-places. The variations in the speed and direction of the flow of the gases
within the flues of a fire-place depend, other circumstances being similar, upon the
variation of pressure at the inlet opening for the air for supporting combustion and
at the outlet opening for the gases of combustion created by the same. A difference
of the pressure of the air prevailing at these openings will accelerate the speed of
the gases if the pressure at the former opening is greater than at the latter, but it
will diminish the same, if the contrary is the case, and this in such a degree that
the gases will be caused to flow in a direction opposite to that desired.
When using gas or petroleum as fuel the variation of pressure should be equal at
both openings at the same time and the present invention is designed to accomplish
this object.
My said invention is illustrated in the accompanying drawing the figures of
which are hereinafter referred to.
In constructing a fire place or stove in accordance with my invention both the
above mentioned openings a and b are located close together side by side and thus
every variation in the pressure of the air will be equal at both. In the present
case the openings are supposed to communicate with the external air so that the gases
escaping through the opening 6 can be permitted to do so without any inconvenience
whatever.
If on the contrary both openings terminate in a limited compartment in which
they will not be affected by variations of pressure these openings may be located at
a greater distance from one another, but in this case it will be necessary, in order
to prevent the said compartment from getting foul by the gases of combustion to
provide an arrangement for carrying away such gases, so that the same may not
create any variation of pressure at the outlet opening.
This device consists as shown in Figures 2, 3 and 4 in providing the fluo c,
through which the gases passing from the fire place through the opening e escape,
with another opening d to the said compartment, through which the flow of the air
into and out of the smoke flue c can take place without creating any variation of
the pressure in the opening e or with a common opening d (Figure 4) through
which the air from the said compartment as well as the gases of combustion from
the fire place can pass. This is effected by arranging above the opening e a
screen of some suitable shape so that the air can flow into or out of the flue c, pass
the said screen without reaching the opening e and without creating any variation
of pressure at the same.
The present arrangements are suitable for fire places, in which either gas or
petroleum is used as fuel but where, as is most convenient with respect to petroleum,
the combustion takes place outside the stove itself the gases created thereby should

page_text: be carried into the stove through one or more openings, the walls of which
surround as closely as possible the pipe, usually of glass, through which the gases
have to pass from the place of combustion, as they would otherwise be mixed
with the air whereby the temperature of the gases would be uselessly lowered.
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 1
claim is :-
In a fire place or stove which is fed with gas or petroleum the arrangement for
preventing the disturbing of the draught in the said fire place, consisting in
arranging the inlet opening for the air, which has to support the combustion, close
to the outlet opening for the gases of combustion, or, where both openings are
situated in the same compartment either close together or at a distance from each
other, providing a funnel for receiving the gases of combustion from the fire place
through one or more openings (e) with an opening (d) communicating directly with
the same compartment through which opening the flow of the air can take place
without affecting the opening (e).
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1001
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.