Year: 1896

page_text: I, WILLIAM ARTHUR GRANGER of 102 Brooke Road Stoke Newington London, N.
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to an improved blower worked by steam jets and employed
for producing currents of air for forcing the draught of boiler & other furnaces.
Hitherto such blowers have been worked with either an annular form of jet (often
made adjustable in area) or with a common (solid section) steam jet incapable of
adjustment in area & power.
In view of the great practical advantages of a variable power in the steam jet and
having found by experiment the inefficiency of the annular types of jet, I construct
my improved blower with two or more solid section jets of different sizes any one of
which can be readily set working while the others are preferably closed.
I prefer to accomplish this by forming the jet nozzles in the end of a cylindrical or
conical plug capable of rotation in a suitable shell, having an inlet for the steam
supply.
Suitable holes or ports are made in the body of the plug, each communicating with
the respective jet nozzles, and upon rotating the plug the ports are successively brought
into communication with the steam inlet, thus supplying the jets with steam as they
respectively come into the right position and shutting off the supply at all other
positions. As all the jet nozzles are of different sizes it is obvious that large variations
in the power of the blast can be obtained, as its strength will vary in proportion to
the area of the jet which for the time being is in action.
The jet nozzles are attached to a tube or pipe having a well proportioned bell
mouthed inlet and a parallel body with either a parallel or diverging outlet, the whole
arrangenient constituting my complete improved blower.
In some cases instead of the foregoing arrangement of jets in the plug I prefer to
socket a small jet nozzle within, or over, a larger one, for the purpose of obtaining
different sized solid jets on the same blower.
I, WILLIAM ARTHUR GRANGER of 102 Brooke Road Stoke Newington London, N.
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 an improved blower worked by steam jets and employed
for producing currents of air for forcing the draught of boiler and other furnaces..
Hitherto such blowers have been worked with either an annular form of jet (often
made adjustable in area) or with a common (solid section) steam jet incapable of
adjustment in area and power.

page_text: In view of the great practical advantages of a variable power in the steam jet and'
having found by experiment the inefficiency of the annular types of jet I construct
my improved blower with two or more solid section jets of different sizes any one of
which can be readily set working, while the others are preferably closed. I prefer to
accomplish this by forming the jet nozzles in the end of a cylindrical or conical plug
capable of rotation in a suitable shell having an inlet for the steam supply. Suitable
holes or ports are made in the body of the plug, each communicating with the
respective jet nozzles and upon rotating the plug these ports are successively brought
into communication with the steam inlet thus supplying the jets with steam as they
come into the right position and shutting off the supply at all other positions.
As all the jet nozzles are of different sizes it is obvious that large variations in the
power of the blast can be obtained, as its strength will vary in proportion to the area
of the jet which for the time being is in action.
The jet nozzles are attached to & work in conjunction with, a tube or pipe having
a well proportioned bell mouthed or coned inlet and a parallel body with either a
parallel or diverging outlet-the whole arrangement constituting my complete
improved blower.
In the accompanying drawings Fig. 1 shows the complete blower (shown in this
case in a vertical position) partly in section, and Figs. 2 and 3 represent on a larger
scale, end and longitudinal elevations of the complete nozzle respectively, the latter
figure being partly in section.
In Fig. I the nozzle B is shown attached to the top of the blower tube CD by
means of a hollow connection E, which forms also a convenient attachment at F for
the steam supply. The nozzle B is so fixed that the jet which for the time being is
in action (such as G in this figure) must always be truly central with the blower tube..
The latter has a bell mouthed or coned inlet H and for some purposes a parallel body Q
and a parallel outlet as shown by the dotted lines J K, and for other purposes a
parallel body Q and a diverging outlet as shown by the lines I, M. It may be either
plain at the end or be provided with a flange (as shown) or with a spigot or socket.
In Figs 2 and 3, three jet outlets or nozzles N, O, P, are shown, all being of
different areas. They are connected to the plug A, which is so fitted as to be easily
rotated in the shell R R (which it fits steam tight) of the nozzle body by means of
the handle S.
The steam enters the body of the nozzle at T and passing through the ports U, U,
issues from the jet N. as shown by the arrows (Fig. 3).
The ports which feed the other jets O, P, are for the time being at V and W and
therefore no steam can enter them but on rotating the plug A these ports can he
successively brought into communication with the steam inlet T. whereupon they
will be in the same position as that now occupied by N, and will consequently be
brought into action and being of different areas will successively produce a different
strength of blast. A pointer Y indicates on divisions such as 1, 2, which of the
jets is in action.
I generally employ an ordinary stuffing box X, X to prevent any possible leakage
of steam, and a similar stuffing box can be fitted to the other end of the plug when
necessary for very high pressures.
It is obvious that instead of using three jets a greater number could be employed
so as to obtain greater variations in the blast.
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 a steam jet blower employed for the purpose hereinbefore named the
combination of a blower tube having a rounded or coned inlet, a parallel body and
either a parallel or diverging outlet, with a jet nozzle in which two or more solid
section jets of different areas can be successively brought into action for the purpose
set forth.

page_text: (2) In a steam jet blower employed for the purpose hereinbefore named, the com--
bination of a blower tube having a coned or rounded inlet, with a jet nozzle in which
two or more solid section jets of different areas can be successively brought into
action for the purpose set forth.
5 (3) The general arrangement and combination of parts constituting the improved
steam jet nozzle as described and represented with reference to Figs. 2 and 3 in the
annexed drawings.
W. A. GRANGER.