Improvements in and relating to Steam Boilers.
Year: 1899

page_text: Date of Application, 23rd May, 1899- Accepted, 8th July, 1899
COMPLETE SPECIFICATION.
Improvements in and relating to Steam Boilers.
I, PATRICK MEEHAN, of Lowellville, in the County of Mahoning and State of
Ohio, United States of America (Boiler Manufacturer), 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 steam boilers.
One of the main objects of my invention is to provide a vertical water tube
boiler so constructed that the bent tubes which connect the upper and lower
drums may be uniform in length, which does away with the necessity of tubes
of different lengths and bends.
My invention comprises the novel features set forth and claimed hereinafter.
To enable others skilled in the art to make and use my invention, I will
describe the same more fully, referring to the accompanying drawings, in
which―
Figure 1 is a sectional elevation of my improved boiler; Figure 2 is a like
view from the side; Figures 3 and 4 are views showing the interior of the upper
drum and the construction of the down-flow tubes; Figure 5 is a cross section
of lower drum, and Figure 6 is a plan view of mud-drum.
Like letters indicate like parts in each of the figures.
The letter a designates a suitable furnace having the grate bars a¹ and suitable
openings for the introduction of fuel and the removal of ashes. The furnace,
however, forms no part of my invention, and any other suitable construction may
be used.
Extending up from the furnace a is the shell or casing b, which surrounds
my improved boiler, said easing having the smoke stack b¹ at the upper end
thereof.
Fitted in the furnace a are the drums cc while at the upper end of
the casing b is the drum d. These drums c, c and d have the round ends e,
but intermediate of said ends are the flat portions f. The lower drums c c¹ each
have one such flat portion f, while the upper drum has one on each side. These
flat portions have the openings formed therein to receive the ends of the
tubes h h. The tubes h enter the openings in the drum c, and the tubes h¹
those in the drum c¹. The upper ends of the tubes enter the flat portions on
opposite sides of the upper drum d. With the tubes bent in substantially the
manner shown, it is apparent that by the use of the flat portion f all the tubes h¹
are the same length and have the same bends. Furthermore, by having the tubes
all of the same length there is no unequal expansion, and consequently there
are no unequal strains. The flat portions f do not, however, interfere with the
strength of the drums, as they do not extend the entire length of said drums,
but said drums have the regular round ends which give strength and rigidity.
The down-flow tubes are preferably outside the casing and enter the
round ends e of the drums. The down-flow tubes extend up within the upper
drum d to about the water line, and the upper ends of said tubes are flared out-

page_text: wardly, as at
of the tubes
. For the reasons more fully hereinafter set forth the upper ends
have the shields m.
Within the lower drums c c are the mud-drums, n.
These mud-drums are supported within the drums e c¹ by the supports n¹.
The tops of the drums n are perforated and at each end thereof are the lids o by
means of which access may be had to said drums for purposes of cleaning. The
lower ends of the down-flow tubes enter the mud-drums n.
Leading from the drums c c are the blow-off pipes r, said pipes.connecting
with the main blow-off pipe 1. Blow-off pipes lead from the mud-drums n
into the blow-off pipes of larger diameter, both of said pipes communicating
with the main blow-off r. By this construction the drums c c and mud-drums π
may all be blown off at one time by simply turning a valve in the main pipe .
The letters represents the ordinary man-hole provided with the covers which
is held in place in the ordinary manner by bolt 2. Secured to the cover s¹ is
the arm which has the roller journalled in its upper end. This roller t¹
runs on the track 2 secured to the interior of the drum. By this construction,
when it is desired to gain access to the drum the cover is released from the
bolt and is then pushed back to the position shown in dotted lines, Figure 4,
the roller travelling on the track 3. In this manner all necessity for handling
and lifting the cover is avoided, and as they weigh considerable and it is
difficult and awkward to remove them, the advantage is at once apparent. To
adjust the cover in place again it is only necessary to draw it back and apply
the bolt as before.
When my improved boiler is in use, the water and steam pass up through the
tubes has said tubes are exposed to the direct action of the heated products
of combustion coming from the furnace. As the tubes h h enter the upper
drum d intermediate of its ends, the water in the upper drum will be raised when
said tubes enter and will fall off toward the ends, as illustrated by the dotted
lines in Fig. 4. The water then descends by way of the down-flow tubes i i¹.
As the tubes extend up within the drum d to about the water-line and adjacent
to the ends of the drum, said tubes being unobstructed, carry down the scum
and other matter which floats on the surface of the water.
The shell m together with the flaring ends of the tubes i¹ assist in the admission
of a greater quantity of water to said tubes. The water passing down the tubes i¹
enters the mud-drums n and the sediment is deposited in said drums, the water
passing out through the perforations into the drums c c. In this manner the
drums c care freed from a great deal of sediment. The sediment once deposited
in the mud drums n cannot well escape, and the consequence is that the water
circulating through the tubes is cleaner, and said tubes will not clog up so
readily. When it is desired to blow off the drums and mud-drums it can all be
done through the one main pipe.
All the tubes h h¹ or the up-flow tubes, can be made of the same length and
bend, so that in constructing the boiler, tubes of different lengths and bends do
not have to be employed. This is a great advantage, as the tubes can be made
and bent in large quantities and in less time, while at the same time if a tube is
to be replaced it can be readily obtained.
The flat portions for the insertion of the tubes being intermediate of the ends,
permits of the regular round ends on the drums, so that said drums are not
weakened by said flat portions, but the ends are rigid and firm.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is:-
1. In a boiler, drums having flat portions intermediate of their ends and
round ends, and tubes connecting said drums, substantially as set forth.
2. In a boiler, drums having flat portions intermediate of their ends and
round ends, and bent tubes connecting said drums, substantially as set forth,

page_text: 3. In a boiler, upper and lower drums, tubes connecting the same, a mud-
drum in the lower drum having perforations therein, the down-flow tubes
entering said mud drums, substantially as set forth.
4. In a boiler, upper and lower drums, tubes connecting same, a mud-drum
in the lower drum and communicating with the lower drum, the down-flow tubes
entering said mud-drums, a blow-off pipe leading from said lower drum, and
a blow-off pipe leading from said mud-drum into said first-mentioned blow-off
pipe, said blow-off pipes communicating with a main blow-off pipe, substantially
as set forth.
5. In a boiler, upper and lower drums, tubes connecting same, the down-flow
tubes having unobstructed openings and extending up within the upper drums,
substantially as set forth.
6. In a boiler, upper and lower drums, tubes connecting same, the down-flow
tubes having unobstructed openings and extending up within the upper drum
to the water line, substantially as set forth.
7. In a boiler, upper and lower drums, tubes connecting same, the down-flow
tubes extending up within the upper drum, said down-flow tubes having out-
wardly flaring ends, substantially as set forth.
8. In a boiler, upper and lower drums, tubes connecting same, the down-flow
tubes extending up within the drum, and shields at the upper ends of said down-
flow tubes, substantially as set forth.
ד
00
1000
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.