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Патент USA US2114848

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April 19, 1938.
Filed 0012129, 1956
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Patented Aprt 19, 1,938.
2,114,848" ‘
Herbert J. Long, Spring?eld, and Hans Albrecht,
West Spring?eld, Mass,‘ assignors to United
American Bosch Corporation, Spring?eld,
Mass., a corporation of New York
Application October 29, 1936, Serial _No. 108,126
2 Claims. (Cl. 1587-115)
This invention relates to gas burners and
particularly burners adapted for use as pilot
vide a pilot burner which consumes far less gas
than has previously been required by such burn
ers and which is therefore more economical in
heaters, the burners are commonly provided with
5 a pilot ?ame adjacent thereto and usually means
are provided for cutting off the fuel supply in case
the pilot becomes extinguished. In such constructions it is common to associate a thermo-
static device with the pilot burner in such a man10 ner that when the pilot is extinguished the thermostatic device closes a valve controlling the
main fuel supply. For the pilot ?ame, both
Bunsen burners and luminous ?ame burners have
been used, The Bunsen type, however, has the
15 disadvantage that if the quantity of gas supplied
to the burner is small the mixture may be ignited in the burner tube and thus create a ?ame
adjacent the primary air ori?ces_ when this /
happens there is no ?ame at the burner tip for
igniting the main burner but the heat generated
_ >
The above and other objects and features of 5
this invention will ,in Part he Obvious to those
Skilled in thelal‘t and in Dari'he more fully set
forth in the following detailed description taken '
in conjunction With the accompanying drawing
in which;v
Fig- 1 is a longitudinal seotionwith parts in
side elevation through a burner/chamber pro
vided with a pilot constructed in accordance with
this invention; Fig. 2 isfa detail on an enlarged
scale of a pilot burner shown in Fig. 1;» Fig. 3 15
shows, in section with parts in side elevation, a
modi?ed form of a Pilot burner; and Fig- 4 is 8»
detail on an enlarged scale of the pilot burner
shown in Fig- 3-v '
In the drawing, reference numeral I indicates 20
2 O by the combustion in the burner tube is still su?i-
' a burner cup in which are main burners 2 which
cient to maintain the temperature of the thermostat and hold in open position the valve controlling the main burner. It therefore happens
2 that this type of pilot burner does not always
afford the protection against the ?ow of fuel? to
the main burner in case the latter is extinguished
at a time when there is no ?ames at the pilot tip.
On the other hand the luminous flame type of
30 burner has the disadvantage that the ?ame projects for a considerable distance from the burner
tip before it meets with suf?cient air to effect
complete combustion. For this reason there is
l little heat at the burner tip in proportion to the
gas consumed and a relatively high rate of gas
consumption is required to insure su?icient heat
adjacent the burner tip to actuate the thermostatic device.
It is a primary object of the present inven40 tion to provide a burner avoiding the above mentioned defects, which possesses the advantages of
the Bunsen type in that a small blue ?ame is pro-vided adjacent the burner tip, while also possessing the advantages of the luminous ?ame burner
45 in that there is no mixing tube in which a mix' ture of gas and air might become ignited. To this
end we provide a burner in which the mixing of
gas and air occurs entirely at the burner tip providing a small-blue ?ame at a relatively low. rate
in the form shown are of the Bunsen type but
Which'may be of any type- A pilot burner 3 is
disposed Centrally. 0f the main burners 2 in a
position to ignite eachjet of the main burners. 25
Gas is Supplied to both pilot and main burners
by way of a pipe 4 which Opens into a tube 5 pro
jecting Centrally into the 611D l and fastened’
thereto by‘means of screw bolts ii. The tube 5
has an enlarged upper end into which a bushing 30
‘v 7 is threaded- A Valve 8 is adapted to Control the
opening at one end of the bushing and a thermo
stat housing 9 closes the opposite end. Above the
valve 8 the bushing Tis provided with lateral
openings 10 which provide communication be- 35
tween the interior of the bushing ‘I and an an
inular chamber ll provided in the upper end of
the tube 5. A connection l2 passes through the
enlarged portion of the tubular member 5 to
communicate with the annular chamber II and 40
leads to the valve chamber I3 of a thermo
statically controlled valve l4. A thermostat l5,
which in the case of a water heater is positioned
in the storage tank or hot water connection of
the heating system or- in the case of an oven is 4r
responsive to the temperature thereof, controls’
' the valve It. From the control device gases pass
by way of connections 16 to the manifold H which
supplies the gas" jets 2. A portion of the gas
50 of gas consumption which, however, insures ig- which passes thi‘ough the valve 8 ?ows upwardly 5o
nition of the main burner jets and at the same through the bushing 1 into ‘the housing 9 of the
time provides su?icient heat‘ immediately ad- » disk thermostat l8. Openings IS in the disk I8~
jacent the pilot burner to insure the actuation of permit the gas to ?ow from the lower portion of
the thermos'taticdevice. ‘
the housing 9 to the upper portion.
A tube 20
It is a further object of this invention to pro-V‘ mounted upon the upper end of the thermostat 56‘ Q
housing 9 has a longitudinally extending passage
2| which communicates with the interior of the
housing 9 by way of a passage 22 controlled by an
adjustingscrew 23. A cap 24 is mounted upon
the upper end of the tube 20 closing the longi
tudinal bore 2|. Angular passages 25 extend
from the bore 2| to the outer surfaces of the tube
20 providing jet ori?ces. The passages 25 are so
directed toward the lower face of the cap 24 that
10 the jets, issuing from these passages impinge
against the lower surface of the cap and spread
outwardly therefrom. The cap is positioned sum
ciently close to the jet ori?ces so that the gases are
still moving at relatively high velocity when they
15 impinge upon the under surface of the cap.
?ange 26 projects downwardly from the outer
rim of the cap de?ecting the gases ?owing along
the under surface thereof toward a baffle
member 21.
The operation of this form of the device is as
follows. Gas supplied from the pipe 4 passes up
wardly through the tubular member 5, the valve
8 and thence by way of openings l0 and connec
tion l2 to the thermostatic valve M. A portion of
the gas passing through valve 6 ?ows upwardly
through the bushing 1 into the thermostat hous
ing 9 and through the openings IS in the thermo
stat disc l8. It. thence passes upwardly through
the passages 2| and 22 in the tubular member
20 and to the jet passages 25. A plurality of such
passages is provided, three being su?icient in a
burner of the size shown. Each passage is di-.
rected upwardly to the under surface of the cap
24 so that the jets from the passages impinge
against the under surface of the cap at an angle
of 45°. It will be noted that the jet passages 25 are
designed to give the gas issuing therefrom a rela
tively high velocity. This velocity is such, and
the jets are so constructed, that there is little op
portunity for combustion to occur while the gas
passes from the jet ori?ce to the surface of the
cap. The high velocity jet tends to entrain air
from the surrounding atmosphere and this is ad
mixed with the gas upon impingement against
the under surface of the cap. It-will be noted
that the cap is placed in close proximity to the
jet ori?ces, the vertical distance between the jet
ori?ce and the under surface of the cap is of the
order of 1/8 of an inch, though on the enlarged
scale of Fig. 2 this distance appears much greater.
supplying gas to the pilot burner. Heat gener
ated by this burner is conducted‘ downwardly
through member 20 to the housing 9 and thus
to disc thermostat l8. Should the pilot ?ame be
come extinguished, the thermostat will cool
quickly to close the valve 8.
The form shown in Fig. 4 is similar to the form
above described, but is more particularly adapted
for use in conjunction with burners wherein it is
desired to position the pilot horizontally. In this 10
form gas is supplied to the main burners 28 from
a gas manifold 29, the ?ow to which may be con
trolled in the same manner as has been described
in connection with Fig. l. The pilot burner 30 in
this instance consists of a tubular member 3| 15
which is mounted on a thermostat housing 32 in
a manner analogous to the mounting of tube 20
upon housing 9 in the form shown in Fig. l. The
tube 3| carries at its outer end a ?ange 33, and is
internally screw threaded to accommodate ex 20
ternal screw threads upon a burner tip member
34. The burner tip 34 has a central passage 35
extending partially therethrough, and the jet
passages 36 afford communication between the
central passage 35 and the atmosphere. The jet 25
passages 36 are directed toward ?ange 33 and the .
open ends thereof are su?iciently close to the sur
face of said ?ange to insure that the gases issuing
from the jets retain a high velocity until they
impinge against the latter.
The operation of this latter form‘ of the device
is analogous to the operation of the form pre
viously described in that the gases issuing at high
velocity from the jet passages 36 entrain a small
quantity of air in the course of their flow from 35
the outer end of these passages to the ?ange 33.
Upon impinging against this ?ange, the entrained
air is mixed with the gases‘before material com
bustion can take place, and the gas is therefore
in condition to burn with a blue ?ame as the 40
gaseous mixture is de?ected outwardly into sur
rounding atmosphere by the ?ange 33.
Having thus described our invention, what we
claim is:
1. A burner comprising a tubular member hav
ing a gas passage extending longitudinally there
of, a cap mounted on said tubular member, an
angular passage forming a gas jet having one end
opening into said longitudinal passage and the
opposite opening to the atmosphere at a point 50
The gas therefore. still possesses considerable ve'- _ immediately adjacent to and directed toward one
locity upon impinging against the under surface of the faces of said cap, means to supply gas un
of the cap, which velocity is too great to permit mixed with air through said passage and jet and
the combustion of the gas and air during the mix
a ?ange extending from one face of said cap,
ing process. As the mixture ?ows outwardly to
whereby gas from said jet is ?rst de?ected out 55
ward the circumference of the cap, it is de?ected wardly by said face and thence de?ected in a di
' downwardly by the flange 26 and spread in the rection at an angle thereto by said ?ange.
form of a thin sheet into the surrounding air. In
2. A gas pilot burner having a plurality of
this manner the gas is thoroughly mixed with the spaced jet passages of small diameter relative to
air in a small space immediately surrounding the their length opening to the atmosphere, means
burner cap, and because it is well mixed with the for supplying gas unmixed with air to said pas
entrained air and well diffused in the air imme
sages, and a de?ecting member immediately ad
diately surrounding the burner tip, it burns with
a blue ?ame similar to a Bunsen ?ame.
It is
'65 impossible for the icombustion to ?ash downward
ly through the tube 20 and burn adjacent the
thermostat because no air is mixed with the gas
until it leaves the jet ori?ce. When the thermo
‘ statically controlled valve l4 shuts off the ?ow of
gas to the main burner, the valve 8 remains open
jacentthe openings of said jet passages and posi
tioned angularly thereto whereby gas issuing
from each of said jets is completely surrounded 65
by air which is entrained thereby for admixture
and combustion therewith upon impinging
against said de?ecting member.
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