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Патент USA US2122625

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July 5, 193.8.
H. c. sHAGALoFF
2,122,625
FUEL CONTROL MEANS
Filed Aug. 21 , ‘1934
3 Sheets-Sheet 2
INVENTOR.
¿è ATTORNEY.
July 5, 1938. _
yH. c. sHAGALoFF
2,122,625
FUEL CONTROL'MEANSv
Filed Aug. 21, 1934
3 Sheets-Sheet 3
ß
BY
¿ INVENTQR.
ff “7
l fé? l
@A ATTORNEY,
Patented .Íu'ly 5, 1938
> 2,122,625
ÍvuNl'rEo STATES PATENT OFFICE
2,122,625
FUEL CONTROL MEANS
Harry C. Shagaloü, Evansville, Ind., assignor, by
mesne assignments, to Servel, Inc., Dover, Del.,
a corporation of Delaware
Application August 21, 1934, Serial N0. 740,757
s` claims. (Cl. 15S-_38)
My invention relates torefrigeration and more
particularly to a refrigerator of the absorption
type operated by a liquid fuel burner. l
' It is an object of my invention to provide a
-5 refrigerator of this type having automatic ther
mostatic control.
~
Another object is to provide an absorption type
refrigerator having a float regulated liquid fuel
burner to whichy the supply of liquid fuel is con
10 _trolled responsive to the refrigeration tempera
ture.
~
A further object is to provide an absorption
type refrigerator having a thermostatically con
trolled liquid fuel burner adapted to maintain a
l54 minimum or pilot flame.
Apstill further ¿object of my invention isto pro
,videy a thermostatically,A controlled liquid fuel
burner for an absorption type refrigerator which
is not subject to smoking upon s'udden changes in
20 the »thermostat temperature or adjustment.
Y
,
In aliquid fuel yburner with a float regulated
liquid level there is. an> appreciable amount of
liquid fuel normally contained in the iloat cham
ber. Itis, therefore, ka characteristic of such a
'25 :burner thatïthe. flame slowly diminishes as the
liquid level» decreases when the fuel supply is shut
off. In accordance with vmy invention, I provide
`an absorption type refrigerator heated by a float
`regulated liquid fuel burner and, to automatically
.30 control the refrigeration temperature, utilize a
thermostatically operated valve in the fuel line
to the burner, and take advantage of the natural
holdover of the burner to keep it ignited while the
thermostatic-valve is closed.
.35
'
Two principal problems are presented in secur
ing satisfactory burner operation with such auto
matic control. When the control valve is closed
for an appreciable length of time and the sur
face level of liquid fuel in the burner decreases,
'im the burner flame becomes unstable and may be'
come extinguished. I meet this problem by pro
viding a wick extending downwardly below the
level of liquid in the burner to maintain a flame
upon decrease in liquid level. The length of time
'a5 that a flame will be maintained by this wick is
determined by the volumetric capacity of the
burner which may be increased, for instance, by
increasing the size of the float chamber. By this
' means, a minimum flame is maintained for auto
50 matlcally relighting the burner when the auto
' matic valve is opened and the supply of liquid to
the burner resumed. The wall of the burner re
ceptacle in which vaporization of the liquid fuel
occurs becomes heated above the level of liquid
555 fuel :lue to combustion of the vapor when mixed
with air. As the level of liquidfuel in this recep
tacle decreases upon closingof the automatic
control valve, the Wall of the receptacle becomes
heated to a greater degree. yIf the liquid level
should be rapidly increased, as'upon rapid opera
tion of the automatic control device, excessive
vaporization of liquid fuel occurs due to the rapid
OI
contact~ of the liquid with thehot wall ofthe re- v
ceptacle.
This excessive vaporization is `evi
denced by an undesirable smoking of theburner
lwhich is due to incomplete combustion of the ex
cess vapor. I therefore provide a liquid flow re
stricting means in the fuel line to the burner, for
instance a capillary tube, to dampen a surge or .
rapid flow of liquid in the burner upon rapid op
eration or-adjustment of the automatic control
device.
»_
--
My invention will be more fully„_understood
yupon reference to the following description and
the accompanying drawings forming partof this ,
speciñcation
and
of
which:
. „
y
.
Fig. l is a broken side elevation, with parts
broken away, of a refrigerator embodying my in-4
vention;
y
Fig. 2 is a detail view, partly in vertical section, 25
of a liquid fuel burner and control device ‘for the
refrigerator shown in Fig. 1;
,
Fig. 3 is a detail section on line 3_3 in Fig. 2;
Fig. 4 is a detail section illustrating a modifica
tion of the apparatus illustrated in the other iig
ures; and
>
Fig. 5 is a detail section on line. 5-5 in Fig. 2.
Referring to Fig. 1 of the drawings, a refrigera
tor cabinet Ill includes a thermally insulated stor
age compartment II accessible by means of a 35
door I2, and a lower apparatus compartment I3
accessible by means of a downwardly hinged door
I4.
An absorption refrigeration apparatus is
mounted in the cabinet I0 and includes a cooling
element or evaporator i5 in the upper part of the 40
insulated storage compartment II, and a genera
tor having a substantially horizontal portion I6 in
one side of the lower apparatus compartment I3.
The horizontal portion I6 of the generator is
provided with a substantially horizontal inner
heating iiue I1 extending therethrough and is
surrounded by an outer heating ñue I8. The out
er heating flue I8 is surrounded by suitable ther
mal insulating material i9, such as mineral wool,
retained in place by a light sheet metal casing 20.
The forward end of the heating'flue I8 projects
beyond the front end of the casing 20 and also
beyond the end of the inner ñue I1. Beneath the
projecting end of the outer heating flue I8 is
mounted a liquid fuel burner assembly 2I having 55
2,122,625
a removable cldmney or combustion shield 22
which extends upwardly into the forwardly pro
jecting end of the outer heating ilue |8 ïwhich is
Communication between the chamber 45 and
a ñoat chamber 46 of the burner is controlled
by a fioat operated valve 41. In Fig. 2, there ap
provided with a cutaway portion or recess 23 to ' pears only a portion of the ñoat chamber 46,
admit the upper end of the chimney 22'. The for
which is shown more fully in vertical section in
wardly projecting end of the iiue I8 and the upper Fig. 5. Communication between the float cham
end of the burner chimney 22 are enclosed by a ber 46 and a =chamber 48 is controlled by a mam
removable thermally insulated hood 24. For a V ually adjustable valve 49. The lower end of a
more complete description of this assembly, ref
10 erence may be had to an application Serial No. burner tube 5|) is connected to the chamber 68,
and the upper end of the burner tube 59 is con 10
'734,075â of William R. Hainsworth.
nected to the lower part of_ an annular burner
In the other side of the lower apparatus com vwell 5|. Above the burner well 5| is removably
~partment I3 is e. storage tank or reservoir 25 for located the burner chimney or combustion shield
liquid fuel, 'such as kerosene. In accordance with assembly 22, comprising perforated cylinders 53
my invention, liquid is conducted from the reser
and 54 surrounded by an imperfora-te frus'to
voir 25 to the burner
through a conduit 26, a conical shield or chimney 55, the cylinders 53 and 15
thermostatically operated valve 21, and a con
54 and the shield 55 being conoentrically located
duit 28. The thermostat for operating .the valve in spaced relation with respect to each other and
21 is preferably of' the expansible iiuid type and
20 includes a sensitive bulb 29 located in thermal ex-v secured by mutually perpendicular bars 56 and
51 which extend through the concentric elements
change relation with the evaporator er cooling and are retained in position by pins 58 ‘in the
element |5 or the space to be cooled and con
Vouter ends thereof.
nected to the thermostatic vaive 21 by a small
Flow of liquid fuel from chamber 45 into the
_tube 30.
»
v25 The path of 'liquid ñow from the reservoir to iioat chamber 46 is regulated by the iioat valve 41.
As may be seen in Fig. 5, the float chamber 46
the burner may be better understood by reference includes an elongated passage connecting two 25
to Figs. 2 and 3. In Fig. 2 there is shown, in float vessels 63 and 64. In the latter are ñeats
vertical section, only that part of the burner nec
65 and 66 from which is ‘suspended a beam 61
essary .for explanation of my invention. The located in the elongated passage. 'The valve 41
30
15
burner and safety valve 3| are disclosed in more
complete detail in said application Serial No.
'734,075 of William R. Hainsworth. The liquid
fuelsupply line 26 from the reservoir is con
ñow o'f kerosene intc- the float chamber at a de
nected to the thermostatically operated valve 21,
stantially constant. If, for _any reason, this liquid
level in the float chamber should rise, liquid 35
would overflow through conduit 62 and cause
operation of the safety vvalve 3| to cut off further
supply of liquid to the burner. From the. :iioat
shown in section in Fig. 3. AThe thermostatic
valve 21, as illustrated, comprises a substantial
ly cylindrical-body member 32 having a central
_ partition 33 forming chambers 34 and 35,.
A
valve opening 36 in the partition 33 aiïords .com
la..i:
is connected to the center ci the beam 61 so as
to be operated by the iioats 55 and 66 to cut ‘off
munication between the chambers 34 and 35.
The chamber 34 is closed by a cover e1 and the
sired liquid level which is thus maintained sub
chamber46, liquid ñows past the manually ad
justable -valve 49 into the ehamber 48 and the
burner tube. 50. When the burner is lighted,
chamber 35 is closed by a resilient diaphragm kerosene flows past the valve 49 at aqrate de
38, secured at its periphery between the body 32“ pendent upon the setting of this valve. The
of the valve casing and a cover 39. A valve mem
maximum level of liquid in the burner tube 56
45 ber 48 in chamber 34 is adapted to cooperate with and, therefore, the maximum burner flame de
the valve opening 36> to control ilow of liquid pend upon the rate of ñow past the valve 49. The
through the latter and is operatively connected valve 49 may therefore be referred to as a maxi
by a valve stem 4|, extending through the vaive ' mum flame adjustment valve. It will be under
opening 36, to an expansible element such as a stood that the valve 49 may be closed to isolate4
50 bellows 42 in the chamber 35 and mounted on the burner tube 50..and well 5| from the ñoat
the diaphragm 38. The bellows 42 is connected
by means of the small tube 30 to the sensitive
bulb 29 on the refrigerator cooling element, the
chamber 46.
»
During operation of the refrigerator, that is, `
when the burnerr` is lighted, flow of liquid to the
burner is controlled by the thermostatic valve >21
responsive to temperature of, the refrigerator
member 481m control ñow of liquid fuel through lcooling element I5, as previously described. This
the valve opening 36 responsive to temperature thermostatic operation of valve 21 aiïects the sizeof the refrigerator cooling element. The thermo
of the burner flame, within the maximum limit
stat is adjustable by means of a screw 43 threaded determined by the float valve 41 and manual
60 through the cover 39 into adjustable abutment
valve 49, to maintain the temperature of the cool
against the resilient diaphragm 38 on whichl the ing element i5 substantially constant. If the'
thermostat bellows e2 is mounted.
y
temperature of the cooling element i5 decreases
Liquid fuel flows from the reservoir 25 through suñiciently to entirely close the thermostatic valve
the supply conduit 26 into the chamber 34, and 2?, the burner flame gradually decreases as the
65 iiow of liquid from the chamber 34 through the
liquid level in the float chamber 48 and burner
passage 36 into the‘chamber35 is controlled by tube 58 gradually decreases.. In order to increase 55
the valve member 48. From the valve chan‘iber the time that the thermostatic valve 21 may 4re- _
35, liquid fuel ilows through the conduit 28 to a main closed without causing the burner ñame to
normally open safety valve 3|. 'Ene latter is go
out, I provide a Wick 59 extending from the
70 adapted to be closed upon overñow of liquid from
the burner or hazardous increase in temperature burner well 5| downwardly into the burner tube
58 so that a llame will be maintained by supply
outside of the burner as described in said appli
of liquid fuel through the wick as long as the
cation of William E. Hainsworth. After passage
through the safety valve 3|, the liquid liows level is above the lower end of the wick. It will
be understood that the wick 59 should not ob
through a conduit 44 toA a chamber 45.
‘ bellows 42, tube 30, and bulb 29 forming an ex
55 pansible fluid- thermostat for operating the valve
struct the normal flow of liquid upwardly in the ’I
3
2,122,625
burner tube 50. In Fig. '4, I have shown a slight
modification in which'a separate tube 60 is con
nected from the burner well 5l to the lower part
of the burner tube 5D and contains a wick 6I
Ul which need not extend into the burner tube 5U,
and therefore does not interfere with flow of
liquid in the burner tube.
During operation with a minimum flame, the
upper end of the tube 50 and the well 5| of the
burner become exceedingly heated, and, if liquid
is suddenly admitted to the burner after such
minimum ñame operation, vaporization of liquid
in the burner tube 50 and burner well 5l is so
rapid that incomplete‘combustion occurs in the
chamber responsive to level of liquid in the lat
ter, and a wick in said burner well having at
least a portion thereof in the path of flow of
liquid in said tube for maintaining a ñame upon
decrease in level of liquid in the latter.
2. A liquid fuel burner comprising a burner
well, a float chamber, a first iiow passage com
municating with said burner well and float cham
ber, respectively, for conducting liquid fuel from
said float chamber to said burner well and in 10
cluding a vertically extending tube having its
upper end communicating with said burner well,
a second flow passage including a conduit for
conducting liquid fuel from a source of supply
to said float chamber, a valve in said conduit,
surge of liquid into the burner might be caused means including a thermostat for controlling said
valve, the portion of said conduit between said
by rapid operation or adjustment of the ther
mostatic valve 21. Af-ter the thermostatic valve valve and said float chamber providing the only
21 has been closed for an appreciable length of , passage for conducting liquid fuel to the latter,
time, the regulating or float operated valve 41 a float operated valve responsive to the level of 20
is open wide, and sudden flow of liquid will cause liquid fuel in said float chamber for controlling
rapid rise of liquid in the burner tube before the admission of liquid fuel into the latter, a
being checked by closing of the float valve. In float in saidfloat chamber for actuating said
order to minimize such liquid surge into the float operated valve, a wick in said burner well
burner and the resultant smoking, I provide a having at least a portion thereof in the path of 25
flow of liquid fuel in _said tube for maintaining
liquid ñow restricting means in the kerosene sup
ply line- to the burner, for instance, by forming the flame after a drop inthe level of the liquid
fuel in said burner well, said float and float
conduit 28 with a small internal diameter. Con
duit 28 is preferably made small enough to be chamber being constructed and arranged to pro
vide a head of liquid fuel affecting flow to the 30
referred to as a capillary tube. It will be under
stood that other liquid flow restricting means burner Well, and flow restricting means in said
, may be used which permit sufficient flow for high second passage constructed and arranged to
flame so that a limitation is not placed on fiow allow flow for high flame and, when the thermo
statically operated valve is opened-to prevent
through valve 49 but which, when the thermo
rapid rise of liquid level in the iioat chamber to
statically
operated
valve
is
opened,
prevent
rapid
35
rise of liquid level in the float chamber to restrict restrict the'head differential between liquid in the
the head differential between liquid in the float float chamber and liquid at the wick.
3. A liquid fuel burner comprising a burner
chamber and liquid at the wick. In such an ar
rangement, pulsations in the flow of liquid` to the well, a float chamber, means including a vertical
ly extending tube having its upper and lower 40
burner, which may be caused bythe rapid oper
40
ation or 'adjustment of the thermostatic control` ends communicating with said burner well and
float chamber, respectively, said tube providing
valve 21, are dampened by the flow restriction.
a passage for conducting liquid fuel from said
Other changes and modifications will be ap
`float
chamber to said burner well, means includ
parent to those skilled in the art wherefore my
invention is not limited to that which is shown in ing a conduit for conducting liquid fuel from a 45
45 the drawings and described in the specification source4 of supply to said float chamber, a valve
in said conduit, means including a thermostat
but only' as indicated in the following claims.
for controlling said valve, the portion of said
What I claim is:
conduit between said valve and said float cham
1. A liquid fuel burner including a float cham
ber, a burner well, means including a vertically ber providing the only passage for conducting
50 extending tube having its upper and lower ends fuel to the latter and including a capillary pas
communicating with said burner well and float sage for dampening pulsations in the ñow of
chamber, respectively, a reservoir for liquid fuel, liquid fuel therethrough, a float operated valve
responsive to the level of liquid fuel in said ñoat
a conduit for conducting liquid from said reser
voir, a valve in said conduit, means including a chamber for controlling the admission of liquid 55
fuel into the latter, and a wick in said burner
55 thermostat for operating said valve, means con
chimney 22, which is evidenced by smoke. Such
, necting said conduit to said float chamber to
well extending downwardly in said tube for main
provide the only passage for conducting liquid
taining the flame after a drop in the level of
fuel to the latter and including a capillary pas
sage for preventing liquid surge upon opera
tion of said valve, a ñoat operated valve for con
said tube is not obstructed.
trolling admission of liquid fuel to said float
liquid fuel in said tube, said wick being of such
size that the normal flow of liquid fuel through
HARRY C. SHAGALOFF.
'
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