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Патент USA US2406052

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Aug. 20, 1946"-
c. E.' wnîLlG
-SIDE ARM HEATER
Filed'Feb. 19, 1945
Z
INVEN TOR.
i
I
y
l
_A_TTOPNEYS
Patented Aug. 20, 1946
UNITED STATES PATET
2,406,052
SIDE ARM HEATER
Celestìn Eugene Willig, Buffalo, N. Y.
Application February 19, 1945, Serial No. 578,781
2 Claims. (Cl. 122-245)
l
2
This invention relates to a side arm Water
heater, such water heaters being used in connec
tion with a domestic water tank to heat the `water
in the tank by convection, the water being with
drawn from the lower part of the tank and upon
being heated in the heater rising and being re
turned to the upper part of the »tank so as to
effect a recirculation and heating of the body
of water in the tank.
assembled condition so as to reduce Shipping
space as well as to facilitate both the manufac-`
ture and the installation of the heater.
Another object is to provide such a water heat
er in which pockets in the water line are avoided,
thereby to prevent the accumulation of sediment
and to insure the heater operating at high efñ
ciency for a long time.
Other objects and advantages will appear from'
One of the principal objects of the present 10 the following description in which:
invention is to provide such a side arm water
Fig. 1 is a vertical section through a gas heated
heater, heated by gas, in which provision is made
side arm water heater embodying the present
for long narrow flue travel of the gas and to
invention and showing its water, gas and flue
provide such a heater in which the maximum
connections.
amount of gas is brought in contact with the 15
Fig. 2 is an enlarged horizontal sectional View,
water coil to obtain the maximum amount of
taken on line 2--2, Fig. 1.
heated water.
Figs. 3 and 4 are horizontal sections, taken on
Another object is to provide such a water heat
the correspondingly numbered lines of Fig. 1.
er which is compact and at the same time has a
The side arm heater embodying the present
large amount of water tube surface and has high 20
invention includes a water coil indicated gener
heat transfer efficiency.
ally at l and housed within a sectional jacket,
Another object is to provide such a side arm
indicated generally at 2, the gas being supplied`
water heater, heated by gas, in which dead or
to a burner 3 at the bottom of the casing 2 and
useless space is avoided andV in which flame 25 the products of combustion passing out from the
spreaders and the like are eliminated.
upper end of the casing 2 through a flue fl. The
Another object of the invention is to provide
coil l is preferably made of copper and includes
such a heater in which the ñame does not con
a central vertical tube 5 o_f substantially greater
tact the coil thereby to increase the life of the
diameter'than the water inlet and outlet pipes ‘
coil.
'
Another purpose is to provide such a heater
having a straight flue and in which the use of
baliies or the like is avoided.
Another purpose is to provide such a heater in
which the water inlet and outlet are in axial
alinement at the center of the heater thereby
to permit of installing the side arm heater closer
to the storage tank, to save space and to provide
a side arm heater which is of pleasing appearance.
Another object is to provide such a side arm
heater which can be readily provided in any size
required.
'
A further object of the invention is to provide
such a side arm heater which is easily installed,
removed and reinstalled and in particular can
receive'the gas supply pipe from any side so as
to avoid the necessity of elaborate pipe ñtting.
A further object of the invention is to provide
a simple sectional jacket which can be placed in
position after all the piping connections have
been made thereby to facilitate the installation
of the heater as well as to permit ready removal,
inspection, cleaning and repair.
6, 8, the central tube 5 being reduced at its lower
end and swaged to the water inlet pipe 6 and
being similarly reduced at its upper end and
swaged to the Water outlet pipe 8. It will be
understood that the water inlet pipe 6 connects
with the lower end of the water storage tank (not
shown) and that the water outlet pipe 3 con
nects with the upper end of this water storage
tank so that the water, upon being heated and
traversing the coil l, will rise and effect a re
40 circulation of the water through the water stor
age tank.
'
'
~
To the lower end of the enlarged central tube
5 of the water coil is secured the lower end of a
helical coil l0, the convolutions of this helical
coil l0 surrounding the central tube 5 and being
spaced therefrom so that the products of combus
tion from the heater 3 pass upwardly through the
annular ñue provided between the central tube
5 and the helical coil I0. The upper end of the
50 helical coil I5) is secured and discharges into the
upper end of the central tube 5.
'
It will therefore be seen that the water enter- I
ing the coil l from the inlet pipe 6 passes up
A further object is to provide such a heater
wardly in two parallel streams, one stream flow
which can be manufactured and shipped in a dis 55 ing through the central vertical tube 5 and the
2,406,052
3
4
other stream flowing through the helical coil Ill.
be completely installed before the unit „is encased.
In order to balance the flow of the water through
This greatly facilitates installation, particularly
the heater so as to obtain approximately the same
rate of ñow in the central tube 5 as in the helical
as Athe gas pipe l 5 can come in from any side and
coil I0, baille means are preferably provided in
the central tube 5. For this purpose a helically
twisted strip of metal l2 is shown as arranged
in the central tube 5, this being designed to pro
vide resistance to approximately balance the
greater resistance of the helical coil 5. It will
also be seen that this twisted bañle strip I2 pro
vides increased turbulence and secures improved
heat transfer efficiency.
Further, to increase
heat transfer efficiency and also to increase the '
surface area of the helical coil I0 with reference
to the cross sectional area of this coil, this coilA 1
is preferably flattened instead of being circular
in cross section.
also does not have to be placed with a high degree
of accuracy since the horse-shoe shaped burner
permits considerable latitude in locating the
burner. After the piping is completed the casing
is applied, this merely requiring the wraping
around of the shell 20, the application of the two
part end .heads 22 and 28 and tightening the
bolts 26.
From the foregoing it will be seen that the
present invention provides a coil for a side arm
heater which is free from sediment pockets; is
compact; and has high heat transfer efficiency,
particularly in the passing of the water in par
allel through the central tube 5 and the helical
tube I0, the two forming a straight ñue expos
ing a large amount of surface to the heated gas.
In order to facilitate the connection- with the 20 Further, the provision of bañies or flame spreaders
gas supply pipe, the burner 3 is in the form of a
is unnecessary and the coi1 is also protected
horse-shoe shaped casting which permits it to
against injury from the flame of the burner.
be inserted under the coil l from any side and
The heater is also readily installed and provides
also permits it to be so inserted and removed c, an attractive side arm heater.
after the coil has been connected with the inlet 25
I claim as my invention:
and outlet pipes 6, 8. 'I'his burner is Yprovided
1. In a side arm water heater, a coil assembly
with the usual oriñces in its upper side Vfor the
comprising a substantially straight vertical cen
discharge of the fuel mixture and the burner is
tral water tube of relatively large diameter, a
arranged so as to embrace the inlet pipe 6 immedi
water inlet pipe of smaller diameter than said
ately below the lower reduced end of the central
central tube extending axiallyl from thevlower
vertical tube 5. The burning gas from the burner
end of said central tube, a water outlet pipe of
3 thereby is discharged around the enlarged cen
smaller diameter than said central tube extend
tral tube 5 which avoids the necessity of a- flame
ing axially from the upper end of said central
spreader or the like, this gas passing vertically Y tube, a second water tube of smaller 'diameter
upward principally through the annular iiue space 35 than said central tube and having a series of con
provided between the central `tube 5 and the sur
volutions surrounding said central tube 'in spaced
rounding helical coil lll. The burner 3 connects
relation thereto and generally concentric there
by a pipe l5 with amixing valve i6, the gas sup
with, means connecting the upper and lower
ply line being indicated at I8.
,
'
ends of said second water tube with the upper
After the water and gas connections have been
and lower ends, respectively, of said central tube
made the casing 2 can be Vassembled around the
whereby the water flows upwardly through said
burner 3 and coil I. For this purpose the casing
two water tubes in parallel, and a helically twisted
is shown as including a tubular sheet metal shell
ribbon in and extending substantially the full
20 which can be longitudinally split, as indicated
length of said central 7tube and impeding the
at 2l, or made in two separate pieces so as to per 45 ilow of Water therethrough thereby to divert an
mit of its application around the coil i after it
increased proportion of water through said sec
has been installed. At its upper end this tubular
ond water tube.
,
_shell 20 is embraced by the two halves of an upper
2. In a side arm water heater, a coil assembly
end head 22, this end head having a cylindrical
comprising a substantially straight vertical cen
side wall which embraces the upper end of the 50 tral water tube of relatively large diameter, a
shell 20 and is formed to provide the flue 4, and
water inlet pipe of smaller diameter than said
this end head also having an end wall which is
central tube extending axially from the lower
provided with a hole receiving the pipe 8. To
end of said central tube, a water outlet pipe of
secure the two halves of the upper end head 22
smaller diameter than said central tube extend
together, to each half of this end head is riveted, 55 ing axially from the upper end of said central
or otherwise suitably secured, a half section of
tube, a second water tube of smaller diameter
a collar 23.
This'collar has an upstanding tu
bular portion 24 which embraces the pipe 8 and
to secure the two halves of the collar together
than said central tube and having a series of
convolutions surrounding said central tube in
spaced relation thereto and generally concentric
’ each half is provided with a pair of flanges 25
therewith to provide an annular vertical flue be
through which bolts or other suitable fastenings
tween said tubes, and means connecting the
26 extend. A similar bottom end head 28 is pro
upper and lower `ends of said second water tube
vided, this bottom end head being formed intwo
with the upper and lower ends, respectively, of
halves and secured together by a two part collar
said central tube whereby the water flows up
29 which is similar to the collar 23V and the halves' 65 wardly through said two water tubes in parallel,
fastened together in the same manner.
and a U-shaped gas burner having horizontal'I'he lower end head 28 can be provided with a
legs connected at one end only and embracing
slot 30vfor receiving the gas pipe l5 and any ad
said water inlet pipe below said central tube and
ditional openings can be provided for admitting
discharging burning gas to flowupwa'rdly through
air to the lower end of the casing.
Y c
70 said annular flue in contact with both of said;
With a casing constructed as above it will be
seen that the water coil and the gas burner can
tubes.
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CELES'I'IN EUGENE WILLIG. i '
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