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Патент USA US3030949

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April 24, 1962 >
Filed June 19, 1957
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Filed June 19, 1957
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Arr-0R N157
United States Patent
Patented Apr. 24, 1962
Berlin-Schrnargendorf, Germany
FIG. 4 is a section along line 4-—4 of FIG. 3,
FIG. 5 is a longitudinal section of a third embodiment,
FIG. 6 is a section along line 6-—6 of FIG. 5.
Filed June 19, 1957, Ser. No. 666,578
3 Claims. (Cl. 122-235)
Referring now to the drawing, F168‘. 1 and 2 show a
boiler in general denoted by 10 with a framework com
Heinrich Vorkauf, Davoser Strasse 2b,
prising vertical tubes 11, lower longitudinal tubes 12
The invention relates to a hot water boiler for a heat—
on both sides of the. bottom of the boiler, and an upper
ing system including a circulating pump, and more par
longitudinal tube 13 located in the top wall of the boiler
ticularly to a hot water boiler of the type which com 10 in the vertical median plane thereof. The interior of
prises a tubular convection heating surface and a tubular
the boiler contains the furnace space 14 in which the
radiantly heated surface, and wherein the circulating pump
urges the circulating water through the convection heat
ing surface whereas so much lifting force is created in
the tubes of the radiantly heated surface that the ?ow
and distribution of the water in the tubes of the latter
takes place, at least predominantly, owing to the natural
lifting force. For this purpose it is necessary to dispose
grate or burners are omitted in order not to overcrowd
the drawing, a down ?ue 15 and an upward ?ue 16. The
path of the combustion gases is indicated by ‘arrows. In
the top of the front wall 17 of the boiler, a transverse tube
18 is connected to the upper longitudinal tube 13.
Downcomers 19 connect the ends of the tube 18 to the
front end portions of the lower longitudinals 12, the
ultimate ends of which are closed by blind ?anges 20.
the tubes of the radiantly heated surface vertically or as
nearly vertically as possible.
The convection heating surface consists of serpentine
In conventional boilers of the mentioned type, the
tubes of the front wall are frequently extended along the
ceiling or at least part of the ceiling. This structure in
tubes 21 which are connected to a. distributor 22 located
boilers in that it causes a better distribution of the circu
upper longitudinal tube 13 which, thus, constitutes the
collector ‘for the side wall tubes 26 and ceiling tubes 28.
rather low in the rear of the boiler. The distributor is
provided with a socket 23 for connection to the heating
volves a severe drawback owing to the fact that in many
system (not shown) so as to receive from the latter the
types of furnaces the tubes located at the front wall are 25 return water under pressure of the circulating pump of
not intensely heated inasmuch as the ?ame originates at
that system. The serpentine tubes 21 are accommodated
the front wall. In consequence, there does not exist a
in the ?ue 16 and open into a collector 24 which is con
high lifting force in the front wall tubes.
nected to the upper end portions of the vertical tubes 11.
The present invention aims, therefore, to avoid the
The tubes 11 form downcomers connected with their
mentioned drawback and to form ceiling tubes of exten 30 lower ends to the longitudinals 12 which, together with
sions of radiantly heated tubes other than front wall
a transverse tube 25, constitute the distributors for the
radiation heating surface.
it is another purpose of the invention to provide a
The radiation heating surface comprises the vertical
boiler in which ceiling tubes consist of extensions of ra
side wall tubes 26 of the furnace space, the rear wall
diantly heated side wall tubes of the furnace.
35 tubes 27 and the upper extensions 28 of the side wall
The invention further contemplates to provide a boiler
tubes which form the ceiling of the furnace. The side
in which ceiling tubes are formed by extensions of radi
wall tubes 26 are erected on the longitudinal distributors
antly heated rear wall tubes of the furnace.
12 and their extensions 28 are bent inwardly and slightly
The invention is advantageous over the conventional
inclined upwardly to be connected with their ends to the
lating water among the individual tubes of the radiantly
heated surface' In the intensely heated tubes of the side
The rear wall tubes 27 extend from the transverse dis
tributor 25 and open into the main transverse collector
30 provided with an outlet socket 31 for connection to the
convey sufficient water through the ceiling tubes. Fur 45 inlet side of the heating system. The upper ends of the
thermore, it is obtained that the tubes which receive most
alternate rear wall tubes are bent inwardly as indicated at
heat are formed more elastic. This is of high importance
32 thereby to create a passage for the combustion gases
with hot water boilers the framework of which consti
from the furnace space to the downward ?ue 15. In
tutes a tubular cage through which the circulating water
order to form the latter, the lower portions 27’ of the
50 rear wall tubes are inward-1y inclined as clearly shown
Therefore, the invention also aims to provide a hot
in FIG. 1. Between ?nes 15 and 16 a partition is formed
water boiler with a water-cooled tubular framework of
by a set of tubes 33 which also extend from the transverse
which the vertical tubes serve as downcomers, and with
distributor 25 and are bent at their upper portions so as
side or rear wall tubes of the furnace extended to form
to be connected to the main collector 30. At the lower
ceiling tubes so that a natural or gravity circulation may 55 ends, alternate tubes 33 are bent inwards at 34 to form
be superimposed on the passage of the water through the
the necessary passage from ?ne 15 to fine 16.
A pair of longitudinals 35 may extend rearwards from
Another object of the invention is to provide a boiler
the ends of the transverse Collector 39 and communicate
with downcomers 36, which are connected to the dis
including collectors for the ceiling-forming extensions
of the side or rear walls so arranged that the most favor 60 tributors 12 substantially in the plane of the tubes 33.
The tubes 35 may be extended as far as the upper ends
able conditions for the circulation exist.
wall or rear wall, a strong lifting force is created owing to
the heating up of the water therein so that these tubes
Further objects and details of the invention will be
apparent from the description given hereinafter and the
accompanying drawing illustrating embodiments thereof
by way of example.
In the drawing:
FIG. 1 is a diagrammatical longitudinal section of a
of the vertical tubes 11 and structurally secured thereto.
The connection between the tubes 35 and 11 may be such
that they may or may not communicate with one an
other. In the front portion of the furnace space the ex
tensions of the side wall tubes may be bent off at levels
increasingly lower towards the front wall 17 of the boiler,
as clearly shown at 28', on account of which the ceiling
of the furnace space is upwardly inclined from a lowest
FIG. 2 is a section along line 2—2 of FIG. 1,
70 level 17' at the front wall to the level of the major por
FIG. 3 is a longitudinal section of another embodiment
tion of the ceiling. This structure renders the provision of
of the invention,
front wall tubes unnecessary.
boiler according to the invention,
In this boiler, the return water from the heating sys
tem is forced by the circulating pump (not shown) of
the latter into the distributor 22 from where it rises
through the serpentine tubes 21 of the convection heating
surface to the collector 24.
From there the water falls
down through the downcomers 11 to enter the distributors
12 and 25 of the radiation heating surface formed by the
side wall tubes 26 with extensions 28 and by the rear wall
tubes 27. In these tubes the lifting force is so great that
the intensely heated water rises to enter the main collector
the distributor 112 and collector 113.
Similarly, side
wall tubes may or may not be arranged between each
pair of adjacent tubes 126’ so as to be connected between
the distributor 112’ and the collector 113’. In other
respects, the boiler 109 is similar to the boiler 10 and
operates in a similar manner.
the extensions or ceiling tubes 28 are connected or di
The boiler 200 of FIGS. 5 and 6 differs from the boilers
10 and 100 essentially in that the rear wall tubes, rather
than the side wall tubes, are bent and extended to form
the ceiling tubes. This boiler has the furnace space 214
and the fines 215 and 216. .The convection heating sur
face 221 is diagrammatically indicated as located in the
half the width of the furnace so as to open into a col
lector in the longitudinal median plane thereof. In the
structure shown in FIGS. 3 and 4, the ceiling tubes are
formed by side wall tube extensions reaching from the
a housing having top and bottom walls, opposite side
30, either through the longitudinal collector 13, to which
flue 216. The framework of the boiler comprises the
rectly from the rear wall tubes 27. The heated water of
upper longitudinal collectors 213 and 213’ connected by
the partition tubes 33 enters the main collector directly.
From there a portion of the hot water may leave through 15 downcomers 211 and 219 to the longitudinal distributors
212, 212’, respectively. A transverse collector 230, with
the outlet 31 so as to feed the heating system whereas
outlet 231, connects the front ends of the collectors 213
the remainder may flow down the tubes 19 and 36 to re
and 213'. Side wall tubes 226 and 226’ extend between
turn in natural or gravity circulation to the distributors
the distributors 212, 212’ and the collectors 213, 213’, re
12 and 25. If the tubes 35 communicate with the down
comers 11, some of the water from the main collector 30 20 spectively. Rear wall tubes 227 are erected on a trans
verse distributor 225. In their upper portions they are
may also mix in the downcomers 11 with the water of
bent forward to form the ceiling tubes 228 which open
the convection heating surface, the collector 24 of which
into the tnansverse collector 230. ‘Partition tubes 233
opens also into these downcomers.
also extend from the transverse distributor 225. Their
It will be clear that a very effective distribution of the
circulating water of the radiation heating surface, among 25 upper portions are bent forward to form ceiling tubes
228’ for the flue 215 and are connected to a transverse
the individual tubes of the latter, can thus be obtained,
collector 229 between the longitudinal collectors 213 and
and that sut?cient water will be conveyed through the
213’. The operation of boiler 20% and its advantages
ceiling tubes. Furthermore, the most intensely heated
will be clear from what has been stated in the foregoing
tubes are rendered more elastic than in the conventional
boilers where side wall and rear wall tubes extend sub 30 description.
It will be apparent to those skilled in the art that many
stantially vertically from their distributors to their col
alterations and modi?cations of the structures shown [and
lectors. All the other advantages mentioned hereinbefore
described may be made without departure from the es
will also be obtained.
sence and spirit of the invention which for that reason
It will be noticed that in the embodiment of FIGS. 1
and 2, the ceiling tubes extend from each side through 35 shall not be limited but by the scope of the appended
one side all the way to the other side. The boiler 100
has a furnace space 14 and fines 15 and 16, the same
as shown and described with respect to the boiler 10 of
FIGS. 1 and 2. There is also the convection heating
surface formed by serpentine tubes 21 extending from a
I claim:
1. In a hot water boiler for a heating system including
Walls, and front and rear end walls, comprising a pair of
vertical tubes in said rear wall and adjacent said side
walls, a pair of horizontal tubes in said bottom wall ad
jacent said side walls hving corresponding ends thereof
in communication with the lower ends of said vertical
45 tubes, a ?rst transverse distributor tube interconnecting
distributor 22 to a collector 24, which opens into down
said horizontal tubes, a second pair of vertical tubes in
comers 11 connected to lower longitudinal distributors
said front wall having the lower ends thereof in com
112 and 112'. The distributors 112 and 112’ are con
munication with the opposite ends of said horizontal
nected by a transverse distributor 25 from which the rear
tubes. a second transverse connecting tube at the junction
wall tubes 27 and partition wall tubes 33 extend upwards
of said top wall and said front end wall having its oppo
to a main transverse collector I30. Whereas, however,
site ends in communication with said second vertical
in the boiler 10 a median longitudinal tube is connected
tubes, a transverse collector tube, horizontal conduit
to the collector 30, there are two lateral collector tubes
means in said upper wall having one end thereof in com
113 and 113', one on each side connecting the ends of
the transverse collector 130 to the ends of the transverse 55 munication with said upper horizontal tube and having
the opposite end thereof in communication with said
tube 18 which, in turn, is connected by the downcomers
transverse collector tube in said upper wall, a second dis
19 to the distributors 112 and 112', respectively.
tributor, a second collector connected to the upper por
The arrangement of the side wall and ceiling tubes of
tion of the vertical tubes in said rear wall, a convection
boiler 100 differs from that of the boiler 10. The side
heating surface adjacent said rear wall comprising ser
wall tubes 126 on the one side are spaced from one an 60
pentine tubes having one terminal thereof connected to
other somewhat more than the diameter of one of the
said second distributor and the opposite end thereof con
tubes. .They are connected to the distributor 112 and are
nected to said second collector, a plurality of upright
bent inwards to form, with their extensions, slightly ris
tubes disposed within said housing adjacent said serpen
ing ceiling tubes 128 which are connected to and open
into the collector 113'. On the other side of the furnace, 65 tine tubes with their upper and lower ends in communi
cation with said transverse collector tube and said ?rst
the side wall tubes 126' are similarly spaced from one
transverse distributor tube, and a radiation heating sur
another but arranged opposite the spaces between the
face comprising a plurality of vertical tubes having their
tubes 126. They extend vertically upwards from the dis
upper ends in communication with said transverse col
tributor 112' and form in their upper portions the ceiling
tubes 128’ which are connected to the collector 113. 70 lector tube and the lower ends in communication with
said ?rst distributor tube and said radiation surface fur
Thus, as clearly shown in FIG. 4, the ceiling tubes 128
ther comprising vertical side wall tubes having upper
cross the ceiling tubes 128' in the longitudinal central
extensions forming the ceiling of the boiler, the lower
plane of the boiler 100. Another set of side wall tubes
of said vertical side wall tubes communicating with
140 may or may not be provided in the spaces between
each pair of adjacent tubes 126 so as to extend between 75 said pair of horizontal tubes, and their upper ends being
r ‘
inwardly inclined and being in communication with said
upper horizontal conduit means.
2. A boiler according to claim 1 wherein said conduit
means comprises a tube disposed in the central longi
tudinal vertical plane of the boiler, and said upper exten
sion-s of said side wall tubes having the ends thereof in
communication with said tube.
3. A boiler according to claim 1 wherein said conduit
means comprises a tube disposed adjacent ‘the upper por
tion of each side wall, and said upper extensions of said
side wall tubes being connected to the header positioned
in the opposite side wall, said side wall tubes crossing in
the central longitudinal vertical plane of the boiler with
their ends in communication with the respective tube.
References Cited in the ?le of this patent
Kerr __________________ __ Mar. 5, 1935
Germany ____; _______ __ Nov. 29, 1951
France _______________ __ Dec. 2, 1953
Germany ______ __'__.____ Apr. 28, 1955
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