Improvements in or relating to Air Injecting Apparatus for Forced Draught and Smoke Consuming Purposes in Steam Boilers and for similar Uses.
Year: 1899

page_text: Date of Application, 28th Apr., 1899-Accepted, 22nd July, 1899
Improvements in or relating to Air Injecting Apparatus for
Forced Draught and Smoke Consuming Purposes in Steam
Boilers and for similar Uses.
I, EDWARD SIMMONS, Steam Laundry Proprietor, of 24, Windsor Terrace, City
Road, St. Luke's, in the County of London, 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 air injecting apparatus for forced draught and smoke
It is the
consuming purposes in steam boiler furnaces and for similar uses.
object of my invention to provide such an apparatus or air injector adapted to
induce an efficient forced draught or current of air without the objectionable
roaring noise hitherto present with the use of such apparatus.
According to my invention I provide in conjunction with the apparatus, air
obstructing devices or screens of suitable material adapted to break up the air current
in its passage to and from the contained injector and at the aperture where it enters
the apparatus. I also so construct the injector that when in use with steam
boiler furnaces and the like it may be situated within the furnace or further
from the furnace front than is possible with apparatus as at present con-
structed.
I will further describe my invention in reference to the accompanying drawings in
forced draught pipe and air injector
which Fig. 1 is a sectional view of a
constructed and fitted in accordance with my invention to a steam boiler
furnace, Figs. 2, 3, 4 and 5 are sections of Fig. 1, respectively on lines W-W, X-X,
Y-Y, Z-Z
A is the forced draught pipe fixed in the boiler furnace B, in the usual position
above the grate, and according to my invention I provide at the inlet a of the pipe A,
a cage C, of wire as shown or of other material suitably perforated and of globular or
any convenient shape, tapering or not as required towards the air inlet a whereat the
cage is suitable secured; across or in this inlet a is fitted a disc or plug C¹, (Fig. 5,)
Both the disc C¹ and the cage
of wire netting or suitably perforated material.
are
or may be secured to a ring such as d adapted to screw into a socket or flange D
which is secured in the usual manner to the furnace front. This socket or flange D
is also formed to receive the air pipe A which screws into same from the inside." In
the air pipe A the injector E is disposed and is provided at or about the nozzle air
inlet e with a longitudinally arranged diaphragm or diaphragms of suitable length.
One g¹ is shown in the drawing (Figs. 1 and 2) and mounted in a plug or sleeve such
as g screwing into the inlet e. A nozzle e¹ is arranged to deliver the combined steam
and air into a chamber H which is in the form of a bulb or tubular casing such as H¹
of larger diameter than the nozzle el to which it is secured by screwing as at h or
otherwise suitably. The chamber H is provided with a transverse screen or disc of
wire netting or perforated material i Figs. 1 and 4, similar to that before described.
The bulb or casing His or may be divided as shown and joined by a screwed sleeve ¿¹

page_text: adapted to carry the screen i; the exit h¹ of the casing H is or may be reduced as
shown and provided or not with a nozzie h2 (shown dotted).
The injector E and its improved fittings described are mounted in the air pipe A
and the outer casing or body of the injector E is provided with a steam inlet S
arranged to enter longitudinally as at S so that the steam pipe S connecting the
injector with the boiler may be arranged to pass thereto longitudinally in the pipe A
as at 2. By this arrangement and construction of inlet the injector may be disposed
at some distance from the furnace front as shown, and at the same time it allows of
the ready removal of the air pipe A for inspection, cleaning or repairing of the
injector. The injector is supported centrally of the pipe A by lugs or projections
such as and by the pipe S2, the latter passing out through the external flange D to
the steain space of the boiler, the usual steam cock being provided.
In operation the strong rush of air at the entrance to the blast pipe A is broken
up by the cage C and further by the screen C', whilst the air passing into the
injector is further broken up by the diaphragm gl and the current of combined steam and
air issuing from the injector nozzle e¹ is broken up by the perforated disc or netting i.
This constant breaking up of the air current by the obstructing devices or screens
described reduces to a minimum the unpleasant roaring noise hitherto existing in
such apparatus, and this action is further assisted by the increased diameter of the
bulb or casing H and its reduced exit and also by the disposition of the injector
within the pipe A at some distance from the air inlet, so that the unpleasant noise
referred to is practically abolished or so reduced as not to be appreciable.
The action of the apparatus apart from the advantages above described is similar
to that of those at present in use for forced or induced draught in boiler furnaces and
elsewhere.
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. In air injecting apparatus for forced draught and smoke consuming purposes in
steam boiler furnaces and for similar uses, the use in combination with the apparatus,
of diaphragms, screens or like devices adapted to break up the air current in its
passage to and from the injector and at the inlet to the apparatus.
2. In air injecting apparatus for forced draught and smoke consuming purposes in
steam boiler furnaces and for similar uses the combination with the air pipe of a
cage such as (C) and perforated disc or screen (C¹) at the inlet and a diaphragm or
diaphragms such as (g) at the injector air inlet, and a bulb or chamber such as (H)
with internal perforated diaphragms or screen (i) through which the injector
discharges into the enclosing air pipe, substantially as described.
3. In air injecting apparatus for forced draught and smoke consuming purposes in
steam boiler furnaces and for similar uses the use of an air injector whose steam
inlet is arranged longitudinally of the enclosing air pipe so that the injector may be
disposed in the air pipe at some distance from the inlet thereto, substantially as and
for the purposes set forth.
4. In air injecting apparatus for forced draught and smoke consuming purposes
in steam boiler furnaces and for smilar uses, the use of an injector having a longitu-
dinal diaphragm or diaphragm arranged at or about its inlet and a bulb or chainber
arranged about its discharging nozzle said bulb or chamber having a reduced
entrance and exit and an internal transversely arranged perforated diaphragm or
screen, substantially as and for the purposes set forth.
5. In air injecting apparatus for forced draught and smoke consuming purposes in
steam boiler furnaces and for similar uses, the use of a longitudinal diaphragm or
diaphragms arranged at or about the injector inlet, substantially as and for the
purposes set forth.
6. The improvement in air injecting apparatus for forced draught and smoke
consuming purposes in steam boiler furnaces and for similar uses, comprising the

page_text: combination of parts constructed arranged and adapted to operate substantially in
the manner, and for the purposes set forth in reference to the accompanying
drawings.
J. C. CHAPMAN & Co.,
Chartered Patent Agents, 70, Chancery Lane, London, W.C.