Improvements in and Connected with Steam Boilers.
Year: 1889

page_text: Date of Application, 19th June, 1889-Accepted, 27th July, 1889.
COMILIE I LITICATION.
Improvements in and Connected with Steam Boilers.
I PROSPER HANREZ, of 37 Rue Philippe le Bon, Brussels in the Kingdom of
Belgium, Civil 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 consists in certain improvements in and connected with steam
boilers particularly of the type described in my Patent No. 17697 December 23rd
1887.
The present improvements consist―
1. In a novel arrangement of the steam receivers of those types of water
tube boilers wherein the tubes are fixed in plain sheet metal boxes serving as
collectors.
2. In the method of connecting the said boxes and the said receivers.
3. In a new construction of self closing covers for the apertures in the boxes in
front of the tubes to permit access to same.
4. In the arrangement of fire grate.
These improvements are illustrated in the accompanying drawings in which
Figure 1 is a vertical section of a boiler constructed on my principle. Figure 2 is n
front olevation of the same. Figures 3 and 4 are sections of two other arrangements
of steam receiver. Figures 5 and 6 show the construction of self closing cover.
Similar letters denote similar parts in all of these figures.
The columns or beams p p as illustrated in" figures 1 and 2 rest on the ground
and support with the assistance of the cross girders QQQ" the tube box and
receiver R R and since all the other parts of the boiler are fixed to these the whole
is supported without the aid of the masonry.
The receiver R R¹ is formed in two parts of which the one R has its axis placed
in the direction of the breadth or face of the boiler and is directly connected by an
extension or intervening chamber G to the upper tube box C in which are fixed the
tubes X. The other part R' of the receiver is at right angles to the first part R and
carries the two domes D D¹.
An internal pipe T is arranged to pass into these domes and into the receiver R¹ ;
it is open at the top of the dome D and is curved back towards the base of the
dome D as illustrated so as to throw down the water carried by the steam into the
funnel V the lower end of which is submerged in the water in the receiver R', and
the steam rises towards the steam pipe M. The receiver R¹ is joined to the lower
tube box in which are fixed the lower ends of the tubes X by the pipe E which
is connected to the tube box C" by the extension F. A blow off cock H is fixed at
the bottom of this pipe E.
In figure 3 the extension G of the box C instead of being connected to the lower
part of the receiver R as in figure 1 is connected to the upper part of it above
water level.
The steam receiver may be formed of two cylinders R R as illustrated in figure 4
having their two axes parallel to the front of the boiler and connected together by
two pipes or chambers S S¹ rivetted to the lower sides of the two cylinders below
water level. A pipe T which may be placed either outside or inside connects the
two domes D D which are rivetted on the two receivers R R¹. In this case the
funnel V described in reference to figure 1 is dispensed with not being required
since the steam only arrives in the dome D' after passing through the dome D the
water level being as described above the pipes S S¹.
With this arrangement the cylinder R is simply rejoined to the lower box C¹ by
two pipes E which pass on either side of the smoke flue K and are connected to the
box C by the two extensions such as illustrated at F in figure 1.

page_text: Figures 5 and 6 show my new construction of self closing covers for closing the
holes in the front plate of the boxes C opposite each tube to allow access thereto for
cleaning and other purposes.
These covers are formed of two coned parts b b¹ of which the one b has a horizontal
flange a larger than the hole to be closed whilst the part b¹ has a vertical flange a¹
coned on both interior and exterior surfaces which fits exactly into the holo which is
itself coned in an outward direction as shown figure 6.
In order to get the part 6 into the inside from the outside of the box the sides or
parts cd of the flange a are cut away. The part 6 has a central screwed spindle e
passing through a corresponding hole in the part b¹.
:
It is plain that if after introducing the part 6 into the box and applying the
part the two are forced together by the nut and screw e e¹ an hermetic closure is
effected, all the cones being forced into contact and the part b will always be held
firmly by internal pressure, its flange a where not cut away being in contact with
the interior surface of the box. Holes e e³ are formed in the part 61 to permit the
escape of any water or air which may become impounded between the two parts.
A further improvement connected with the type of boiler described in my above
mentioned patent relates to the arrangement of firegrate. The ordinary grate with
bars arranged horizontally or nearly so has a disadvantage when used for this type
of boiler with water tubes strongly inclined towards the vertical in that the flames
and products of combustion are too strongly diverted from direct impingement upon
the tubes. To obviate this I have designed an arrangement specially applicable to
my type of boiler which consists in disposing the firebars transversely and strongly
inclined towards the tubes, thus forming a series of steps with horizontal airways as
illustrated at Z figure 1. By this arrangement the draught causes the flames to
impinge directly upon the lower part of the water tubes.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In steam boilers of the water tube type the improvement consisting in making
the upper receiver in two cylindrical parts connected direct to the upper tube
junction box by the connection G, and the other R¹ to the lower box C¹ by the
pipe E and connection F substantially as and for the purposes set forth.
2. The improvement connected with steam boilers constructed and arranged as
specified in my hereinabove recited Patent consisting in the self closing covers con-
structed as described in reference to figures 5 and 6.
3. The improvement connected with water tube boilers constructed and arranged
as specified in my hereinabove recited Patent consisting in the application thereto of
the arrangement of firegrate described and illustrated at Z figure 1 of the accom-
panying drawings.
Dated this 19th day of June 1889.
J. C. (HAPMAN,
70, Chancery Lane, London, W.C., Agent.