Патент USA US2122625код для вставки
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. '