US2328189A - Refrigeration - Google Patents

Description

Aug. 31, 1943. G. A. BRA'ciE ET AL REFRIGERATION Filed Sept. 16, 1959 4 Sheets-Sheet l `fgregl@raee Alfred 6. @rasa ATTO RN EY Aug. 31, '1943,

G. A. BRAE ET AL 2,328,189

REFRIGERATIo-N Filed Sept. 16, 1959 '4 Sheets-Sheet 2 l INVENTOR 6e orge A. rae

Alfred 6. @mss ATTORNEY ug- 31, 1943- G. A. BRACE ET AL 2,328,189

REFRIGERATION Filed Sept. 16, 1939 INVEN'ORI @e0/ye A. Brace Aug. 31, A1943. l G.'A. BRACE ET Al.

REFRIGERATION Filed Sept. 16, 1939 4 Sheets-Sheet 4 A Alfred 6'. lfos' ATTORNEY l net construction.

Paieiiied Aug. ai, i943 UNITED STATE S -PATi-:N'l orifice c h REFRIGERATION V t George A.'Brace,= Winnetka, and Alfred G. Gross,

Wilmette, lll., assignors'to The pany, North Canton, Ohio Hoover Com- .Application September 16, 1 939, Seriali No. 295,230 A (ci. faz- 99) p l M Claims. This invention relates to the art of 'refrigeration and more particularly to a novel construction ofrefrigerating apparatus and especially the evaporator thereof, permitting a highly eililcient, usable and specially designed organization of the apparatus in a cabinet.

'It is a principalobject of the present invention to provideean evaporator and cabinet construction for a refrigerating apparatus in which the low temperature portions of the evaporator are i effectively insulated from contact with the airin of the evaporator construction illustrated in Figure 1. i v c Figure 3 is a partial sectional perspective view of a modied cabinet construction..

the food storage compartment and which indirectly refrigerates such'air. i

It isl still anotherA object of thepresentl invention to provide a refrigerating apparatus in which the evaporator thereof'is positioned in the upper portion of the cabinet and on opposite sides thereof to provide a central air-cooling and re- 'frigeratin'g chamber so constructed and arranged that' a selected wall of the evaporator casingthe re-l serves to carry the box-cooling load of frig'erating apparatus.

It is another object of the present invention to provide a refrigerating apparatus .in which the' cooling elements are so constructed and arranged.

that a highly em'cient air circulation is provided in-the .refrigerated compartment'and in which the warmest air'present in the-.refrigerated champrovide a refrigerating apparatus provided with van evaporator having an insulated casing in which the evaporator casing is wholly, partly indisclosed in Figure -6. l

Figure 8 is a partial sectional perspective-view Figure 4 is a perspective lview of the ,evaporah .of Fig' tor structure utilized in the construction ure3. y

Figure 5 is a sectional Yside elevational view of the construction shown in Figure 3. 4

Figure 6 is a partial sectional perspective view of another form of the invention.

Figure 7 is a perspective view of theevapora tor coil construction utilized in the apparatus of still another form of the invention.

Figure 9 is a perspective viewof the evaporator con construction utilized in the invention disclosed in Figure 8.

Referring now vto the drawings in detail and first-'to Figures 1 and 2 thereof, therev is disclosed an absorption refrigerating system comprising a boiler B, an analyzer D. an air-cooled re'ctiner R,

a tubular air-cooled condenser C, an evaporator Evi,- a gas heat exchanger G, a liquid heat exchanger L,' a solution reservoir S, an inclined tubular air-cooled absorber A; and a circulating fan F which isdriven b y an electrical motor M.

n ber is in contact with the exterior walls thereof.

-v It is still-another object of the inventionto energization of the circulating motor M will be .taken in connection withl the accompanying drawings in which-' y I i Figure 1 is a diagrammatic representation of 'an absorption refrigerating system. embodying the present invention including a fragmentary partial sectional perspective view of the cabinet construction. f

Figure 2 is a partial sectional elevational view The above mentioned elements are connected by various conduits to form a plurality -of gas -d circuits constituting a complete re' frigerating. system to which reference will be made in more detail hereinafter. v

The above described refrigerating system be charged with a suitable refrigerant, such as` ammonia, a suitable rsolvent therefor, 'such as water, and any inert pressureequalizing medium, l c preferably a dense inert gas like nitrogen.

The boiler B may be heated in any suitable or desired manner as -by an electrical cartridge heater or by a combustible fuel burner.

The application of heat to the boiler B and the controlled in any desired manner. `A preferred construction is-disclosed and claimed in the copending application of Curtis C. Coons, Serial No.

The application of heat to the boiler B generates refrigerant vapor from the strong solution; therein contained. The *vapor so generated passes upwardly'through the analyzer D in coun- I terow to` strong solution flowing downwardly therethrough.l 'I'he refrigerant vapor is then conveyedfrom the upper portion of the analyzer to. the upperportion of theair-cooled condenser rectifier R.

'.I'he weak solution formed in the boiler by the generation `of refrigerant vapor therefrom is conveyed from the boiler to the solution reservoir S by way ofthe conduit I2, the liquid heat exchanger LI and a looped finned pre-cooling conduit I3. The lean solution thus suppliedto the reservoir S is pumped therefrom into the upper portion of the absorber A by means of a gas lift pump conduit I5. Pumping gas is supplied to the conduit I5 below theA liquid level normally maintained therein by means of the conduit I6 which is connected to Athe discharge conduit I1 .cr the circulating fan F. As win bencted from the drawings, the pump conduit I5 actually discharges into the suction conduit I3 of the circulating fan F which connects directly to the upper portion of the absorber A. The solution reservoir S is also vented to the conduit I8 by means of the conduit I3 whereby the pump conduit I5 effectively operates with the total pressure difx'erential developed by the circulating fan F.

The lean solution thus supplied to the upper portion of vthe absorber A flows downwardly therethrough by gravityy 'in counterflow relationship to a rich mixture of inert gas and refrigerant vapor which is supplied to the bottom portion of the absorber in a manner to be described mpre fully hereinafter. The contact between the rich gas and the absorbing solution in the absorber may be improved by including suitable obstructing and guiding devices in the interior of the absorber such as those disclosed in the co-pending application of William H. Kitto, Serial No. 206,143,.filed May 5, 1938. In the absorber the absorption solution absorbs refrigerant vapor from the rich gas that is supplied thereto and the resulting heat of absorption is rejected to cooling air flowing over the exterior walls of the absorber conduits and the cooling i ns mounted thereon.

The rich solution formed inthe absorber thus drains to the bottom portion thereof from which point it is conveyed to the ,upper portion of the analyzer D by way of the conduit 20, the liquid heat exchanger L, and the conduit 2 I This completes the absorption solution circuit.

The lean inert gas formed in the absorber by the absorption of refrigerant vapor therefrom is conveyed from the upper portion of the absorber C by means of the conduit IIl whichincludes themanner described heretofore, thus completing the inert gas circuit.

The evaporatorper se comprises .a pair of lat- -erally spaced freezing sections 32 and 33.

AThe evaporator freezing section 32 comprises a pair of horizontal, parallel, vertically spaced and rearwardly` facing U-shaped, conduits 34 and 35 which are serially connected by a riser conduit 36. The inertgas and liquid refrigerant ing for the evaporator coil section 33 comprises.

to the suction inlet of the circulating fan F by means of the conduit I8.- The lean gas is then placed under pressure by the circulating fan and is conveyed therefrom to the bottom portion of the evaporator E by way of the conduit I1, the gas heat exchanger G and the conduit 23.

The particular construction of the evaporator will be described more fully hereinafter. For the present itis sufficient to note that liquid refrigerant is ,discharged from the bottom portion of the condenser C through a conduit 24 which joins a lU-shaped downwardly extended conduit 25 'which in turn vjoins the gas inlet conduit 23. 'Ihe inert gas travels through the evaporator with a velocity sufficient to sweep or drag the liquid refrigerantr therethrough as it is evaporating to produce the refrigerating effect. 'I'he resulting rich gas formed in the evaporator is conveyed therefrom to the gas heat exchanger G by way 4of the conduit 21. After traversing the gas heat supply conduit 23 connects to the inner leg of lthe conduit 34.

The evaporator section 33 comprises a pair of horizontal vertically spaced and rearwardly facing U-shaped conduits 31 and 38 Vwhich are serially connected by a riser conduit 33.. The inner leg of the U-shaped conduit 31 joins the inert gas discharge `conduit 21. 32 and 33 are serially connected by a cross connectingconduit 40 which joins the inner adjacent legs of the U-shaped conduits 35 anc". 38.

Thus, the inert gas and liquid refrigerant supplied to the evaporator through the conduit 23 traverses the U-shaped conduit 34, the riser 36, the conduit 35, the cross-connecting conduit 40, the U-shaped conduit 38, the riser 39 and the U -shaped conduit 31 from which it is discharged through the conduit 21., An anti-blocking drain 4I connects the upper side of the U-shaped conduit 34 adjacent the riser.

The apparatus includes a cabinet construction 42 which encases a storage compartment indicated generally at 44. The cabinet1 is provided with a rear wall opening 45 of a sine sufficient to permit the evaporator coil construction to pass therethrough. An insulating sealing plate 46 is mounted rigidly with the evaporator coil construction and is designed to seal the opening 45 when the apparatus is placed Within the chamber 44 of the cab-inet 42. Only the upper portion of the cabinet has been illustrated; however, it will be appreciated that the cabinet will include the usual insulated door and amechanism compartment and cooling air duct positioned below and along one wall of the storage chamber 44. The refrigerating apparatus with the exception of the evaporator will be distributed in the mechanism compartment and cooling air duct in any suitable manner. Each of the evaporator sections 32 and 33 is encased within an insulated housing. The housa U-shaped insulated wall 48 which is formed integrally with the cabinet construction and exchanger G the rich gas is then conducted byway ofthe conduit; 23 to the bottom portion of the absorber A through which it ows upwardly with the open face ofthe U facing the central portion of the chamber 44. The ice-freezing evaporator section 32 is housed in a suitable U- shaped insulated casing 43 also facing inwardly of the chamber 44 whereby the open faces of the U-shaped housing 48 and 43 face each other. The open faces of the U's are suitably closed by means of a U-shaped panel 53 having a side wall 5I closing the housing 48, a side wall 52 closing the housing 48 and a cross-connecting bight portion 53 lying against the rear wall of the cablnet 42. A suitable slot 54 is formed in the panel 53 and tbe rear ends of nthe panels 5I and 52 to accommodate the conduit 40. Suitable insulated doors will be provided for the housing 43 and 43V l to provide access thereto and to 'prevent heat leakage through the open front portions thereof 'Ihe bottom portions of the panels 5I, 52 and 53 are inset away from the central portion of the chamber 44 and are then coiled upwardly to form a dri-p trough 55 which communicates with l in counterow to the'absorption solution in the' 75suitable disposal duct 56 at its central rear por- 'I'he evaporator sections tion for the'purpose of-conveying'con Q and defrosting drainage to a point of ultimate disposition.

Suitable `freezing receptacle supporting shelves are mounted within the chambers fand 49 inV heat .transfer relationship with the freezing .coil sections therein contained.

Referring specifically to Figure 2 the conduit " sections 34, 35, 31 and 38 are in heat transfer relationship with shelves 58, 59, 88 and 5|, re-

spectively. The inner ends of the shelves 58 to 8 I,

inclusive, areturned downwardly as is indicated generally at 82 to provide'angesabutting the plate elements and 52 whereby these elements are` refrigerated from the various conduit sections Within'the housing 48 and 49 .but through the medium of a -poor thermal bond; that is, the

-thermal bondV between the flanges 62 andthe plate elements 5| and 52 is one of mere contact and not a bond such as -is provided by welding,

brazing, soldering, or the like. By this means lower the humidity within the storage compartment 44 is greatly minimized.

'I'heabove described construction provides a highly desirable refrigerating arrangement in that the air within the compartment 44 may rise along the outer side walls thereof across the top of the casing 48 and 49 and then drop downwardly between 'the plates 5| and -52'which serves to refrigerate the same. By this means the space 5 between thetwo sections of the evaporator is utilized 'notonly as anair cooling means but also provides a space for the refrigeration of tall receptacles and similar articles without otherwise- .altering the construction -of the apparatus. Articles being refrigerated in the space between the plates-5| and 52 will be supported upon a suitable shelf provided for'that purpose but not shown `herein.

This method of air flow provides for Veven`dis- `".tribution of cold air to all portions of the comv partment 44 and also insures that the coldestair therein shall be in the center of the compartment and that the warmest air shall rise along the outer side walls thereof, thereby minimizingheat losses from theA insulated walls of the cabinet 42.

There is thus provided'a refrigerator inwhi'c-h vthe low temperature freezing portions thereof are thoroughly insulated from contact withthe air within the food storage compartment and also serving directly to refrigerate the air within that compartment through the medium. vof a poor thermal bond which permits the airl to be refrigerated at a relatively high temperature and consequently at a relatively high humidity.

Referring now to Figures 3, 4- and 5 there-is disclosed a modified form of the invention. It will be understood that this form of the invention is designed and intended vto be utilized in refrig- .erating systems of the type described fully inv connection with Figures 1 and 2 and therefore only the cabinet and evaporator-construction is illustrated in Figures 3,14 and 5.

In this form of the invention there is provided aninsulated cabinet-65 provided witha storage' space indicated generally at 58.] 'Ihe rear wall of the cabinet is provided with an opening- 51 of a sizey suiiicient to permit the evaporator to pass wuierethrough anais closed n bya vsuitaicne insulated w'indow plate 'element '88. l The evaporator utilized in form of the imi- 3 vention comprises a pair of spaced freezing sections 10 and 1|. The freezing section 1|)v includes a pairof horizontal. parallel, vertically spaced and vrearwardly facing U-shaped conduit sec- 5 tions 12 and 13. The evaporator section 1| comprises a pair of horizontal, parallel, vertically spaced and rearwardly facing U-shaped evaporator conduits 14and 15. The inert gas is supplied .to the inner leg of the Ushaped conduit 12 by means of a conduit 11. Theliquid refrigerant is supplied to the conduit 11 from the condenser by means ofl a conduit 18. This evapo'- rator, like that described in connection with Figures v1 and 2, is of the type in which the inertl 15 gas travels with a velocity suihcient to propel the liquid refrigerant therethrough as it is evapol rating to produce a refrigerating effect.

The'cuter legs of the U -shaped conduits 12and 14 ar@ serially connected by a rear cross connectv ing conduit'18. 'I'he outer legs of the upper U- shaped conduits 13 and 15-are'likewise connected .by a rear cross-connecting conduit 88. The conduits 'Hand 15 are serially connected by a suitable riser conduit 8|. l'I'he rich inert gas formed in the evaporator is conveyed therefrom to the gas heat exchanger G' by means ofa conduit 82 which connects to the inner leg of the conduit 13.

The.inert gas and liquid refrigerant traverse the lowerftwo conduits 12 andU, pass through the riser 8| through the upperl conduits 15 and 13 after which they are conveyed to the gas heat .exchanger by means ,of the conduit 82. 'I he evaporator is also provided with a suitable overiow drain conduit 83 corresponding to the drain l conduit 4| described in connection with Figures 1 and Z.

A suitable vertically positioned large area aircooling plate 85 is thermally bonded to the crossconnecting conduits 19 and 80 for a purpose to 40 be described more fully '\hereinafter.

The evaporator sections 1li and 1| are housed .in insulated chambers 81 and 88,y respectively.

The chamber 88 is defined by a-bottom wall 89 and an inner side wall 88 both of which integral with the side and top walls respectively of the cabinet 55. The outer side and top walls of the chamber 88 are defined by the side and top walls of the cabinet 65. The rear wall 9| ofthe chamber 88 is provided with an opening 92 which is closed by an insulated closure element 93 mounted upon the rear end of the U-shaped evaporator conduits 14 and 15 and in front of and in spaced relationship with the air cooling plate 85 whereby upon insertion of the apparatus into the cabinet the closure element 93 seals the [rear wall of the compartment 88and forms an air iiu'e. on -each side of the plate 85 between 'the closure elements 88 'and 68.

'I'he construction of the compartment 8.1 is 80 identical with that described in connection with the compartment 88 and need notbe described in detail. The front end of the compartments 81 and 88 are sealed by a suitable insulated door construction (nfot shown). A central channel 95 is formed between th i freezing chambers -81 and 88 and a pair of cooling air channels 98 and' 91 are formed on the vfront andrear sides respectively of the air-cooling plate 85 andfrearwardlyl of the freezing chambers 81 and 88.

The cooling air ows upwardly through the central'channel 95 and then rearwardly'to the plate 85'over which it spreads as it drops downl wardly into the lower portion of the storage compartment 68.

ing compartments are insulated on all sides thereof and do not refrigerate the air within the storage compartment either directly or lndirectly. The freezing compartment may be considered as two entirely separate and distinct insulated refrigerating chambers operatively connected, however, to a single system.

Due to the very large extent of the plate 85 and to the relatively small extent of the conduits 19 and 80, the net over all temperature of the plate 85 is considerably above the freezing point of water whereby the same does not collect' an appreciable quantity of frost and the compartment 66 is maintained at safe refrigerating temperatures without unduly lowering the humidity thereof.l

Referring now to Figures 6 and 7, thereisdisclosed a modified form of the invention comprising an insulated cabinet including a refrigerated food storage compartment |0|. This form of the invention is designedl and intended to be utilized with a refrigerating system such asthat illustrated in Figure 1. Therefore, only the evaporator and upper cabinet have been illustrated as that is the only manner in which this form of the invention diers from that illustrated in Figure l.

The upper portion of the cabinet is provided with a pair of laterally spaced insulated freezing compartments |02 and |03 which are formed integrally'with the cabinet and will be provided with suitable front insulated closures, not shown.

The spacing of the freezing chambers |02 and |03 provides air ducts |04and |05 between the outer walls of the same and the left and right suitably -bonded thereto to provide good heat transfer between the conduit 'and the fins.

'I'he inner leg of the U-shaped conduit |24 is connected to-the rich gas discharge conduit |35l which connects to the rich gas side ofthe gas heat exchanger.

.-This evaporator, like those previously described, is of the type in which the liquid refrigerant is propelled by a high velocity stream of inert gases flowing through the evaporator. Therefore, the inert gas and liquid refrigerant traverse the U-shaped conduit ||8, the riser |20, the conduit H3, riser |23, conduit |28, riser |30, conduit |25, riser |26, conduit |24 and discharge conduit |35 and in the order narn'ed. f 1As is readily apparent frornFigure 6, when the apparatus is assembled the coil sections ||5 and ||6 are positioned in the freezing chambers |02 and |03, respectively, and the conduit |28 with its associated cooling flns is positioned in the air ductl lli-between the freezing chambers |02 and |03.

Suitable shelves such as are indicated generally at |31 in the chamber |02 will be positioned over hand sides of the cabinet |00 respectively, as Y viewed in Figure 6. There are also provided top air passages |01 and |08 between the top walls of the freezing chambers |02 and' |03, respectively, and the top wall of the cabinet |00. A central air flue l0 is provided between the adjacent walls of the freezing chambers |02 and |03.

The rear wall of the cabinet |00 is provided with an opening ||2 of a size suiiicient to permit insertion of the evaporator coil construction to be described hereinafter and is closed by a window element |3 which is 1.u'gidly attached to the evaporator coil construction.

The evaporator coil construction comprises apair of laterally spaced freezing.' sections ||5 and H6. The freezing section ||8 comprises a pair of horizontal, parallel, vertically spaced and rearwardly facing U-shaped conduits ||8 and ||8 which are serially connected by a riser conduit |20. The inert gas is supplied to the inner leg of the U-shapediconduit ||8by means of a conduit 2| to which the liquidv refrigerant supply conduit |22 is also connected. Theconduit |23 will lead directly to the condenser and the con- .duit |21 serves as a condenser vent and pressure regulating ventl and will connect directly to the rich gas side of the gas heat exchanger G".

The freezing section 5 comprises a pair of horizontal, parallel, vertically spaced and rearwardly facing U-shaped conduits |24 and |25 which are serially connected by means of a riser conduit |26. The adjacent inner legs of the U- shaped conduits H3. and |25 are each serially connected to the adjacent leg of an upper centrally located Au-shaped conduit A|28 by means of laterally projecting riser conduits |23 and |30, respectively.

The U-shaped conduit |28 is provided with a plurality of spaced cooling ns |32 which. are` each of the conduit sections ||8, ||9, |24 and |25 to support freezing trays 4and the like.

In this form of the invention the air for the storage compartment |0| passes upwardly along the side walls of the cabinet across the top wall thereof and then downwardly tothe central air cooling flue, thus directing the coldest air into the central portion of the cabinet through which it may spread equally in all directions to assure uniform refrigeration of foodstuffs stored therein. Tall receptacles may be supported in the lower portion ofthe channel ||0 upon a suitable shelf (not shown).

It is to be noted in this form of the invention that the freezing sections of the evaporator are totally insulated and sealed fromj'the storage compartment |0| and that the air never comes in contact therewith. I

The riser conduit |29 passes through a suitable slot |38 formed in the inner side wall of the freezing compartment |03, 'Afsimilar slot will be provided in the inner side wall of the freezing only the evaporator and upper cabinet have been illustrated as that is the only manner in which this form of the invention differs from that illustrated in Figure l.

In this form of the invention lthere is provided an insulated cabinet |50 which is provided with a refrigerated chamber |5|. Insulated freezing compartments |52 and |53 are positioned in the upper corners of the cabinet |5|! and are formed4 A integrally therewith. A medium temperature chamber |54 Yis formed. between the freezing chambers |52 and |53. The bottom wall of the chamber |54 is defined by a slotted supporting plate |55. A similar slotted plate |58 is slidably supported beneath the plate |55 whereby to allow or prevent communication between the chambers A|54 and |5| depending upon the position of the.

slidable plate |56.

The evaporator structure utilized in this forni' of the invention comprises a pair of spaced apart freezing sections |60 and |6|. The freezing secparallel..

tion |6| comprises a pair of horizontal,

compartments |52 and |53.

vertically spaced and rearwardly vfacing U-shape conduits |62 and |63. The outer leg Aof the .U- shaped conduit |62 is in open communication with the inert gas supply conduit |64 to which the liquid refrigerant supply conduit |65 is alsov connected.

The freezing section |60 comprises a pair of horizontal, parallel, vertically spaced and rearwardly facing U-shaped conduits |66 and |61 which are serially connected by means of a riser conduit |68.

jacent outer leg of a horizontal, rearwardly facing W-shaped box-cooling 'conduit |15 which underliesy the coil sections |62 and |66. I The left-hand l outer leg of the conduit |15, as viewed in Figure 9, is `connected to the rich gas side of the gas heat exchanger by means of the gas discharge conduit |16.

Therefore, the path of the inert gas and liquid refrigerant through the evaporator is asl follows: 'I'he coil sections |62, conduit |10, conduit section |66, riser |63, conduit section |61, cross connecting conduit 1|, conduit |63, riser |13, W- shaped conduit |15, and discharge conduit |16. The right and left hand adjacent legs of the W-shaped conduit |15 are provided with cooling y lns |18 and |19, respectively. The cooling iins will be suitably thermally bonded to the conduit |15 to provide good heat transfer therebetween.

Asis illustrated in Figure 8, the w-shapedconduit and 'its associated fins u-nderlie the chambers |52,i |53 and |54 in position to refrigerate the air within lthe compartment |5I. The crossconnecting conduits |10 and |1| are received in suitable slots such 4as those indicated at |80.in

the rear end of the adjacent 'side walls of the connecting conduits |10 and '|1| serve to refrigerate the chamber 54.

The rear wall 'of the cabinet |50" is provided with an opening |33 lof a size sufllcient to ac commodate the entire coil structure illustrated in Figure 9 andtis closed by aninsulated panel |34 which is rigidly mounted upon the coils.I

Therefore, the crossn other portions of the evaporator by reason of the fact that the linert gas is partly saturated after it .has traversed the upper portions of the evaporator and'is then supplied -to the conduit |15 which will prevent refrigeration from occurring in that conduit at a very' low. temperature level.

iHowever, adequate refrigeration for the comparte ment |5| is provided by the conduit |15...

The present invention provides -a highly emcient refrigerating apparatus in which the low temperature freezing portions thereof are totally or partially insulated from contact with the air within the storage compartment in o rder' to pre- Y vent objectionable frost deposition. Moreover, the .central portion of -the refrigerator is free to provide a cooling air flow path, a refrigerated space for tall'receptacles, and a space for the Vproduction of refrigeration withinf the storage compartment. The various coil structures disclosed are particularly well adapted to the divided freezing chamber construction characteristic of` the present invention and may be incorporated therein with. e minimum of effort without requiring alterations or modifications in other parts of the system and without impeding free and proper circulation of the various fluids normally supplied to the evaporator.

Various modifications of each of the embodiments may be made Without departing from the principle of the invention as will appear obvious to those skilled in the art to which the same pertains. For example, referring to Figure 1, it will be. appreciated that slot 54 need not be cut in plate 53 to provide for evaporatorconduit 40.

Instead, the portion of plate 53 opposite conduitg 40 may be shaped so as ltor iit closely about the conduit thus coveringand concealing thesame suitable shelves such -asthese indicated generally at |05 in the compartment |52 overlie and are in heat transfer relationship with the conduits |62, |63; |66 and |61 vfor the purpose of supporting freezing trays and the like.

intuir' form of the inventienthere lsQprovidea a refrigerating apparatus in= which refrigeration will be produced at a relatively low. temperature in the compartments |52 and I 53 at an inter- 1 mediate temperature` level in the compartment |54 and vhigh temperature high Vhumidity'refrigeration will 'be providedin the foodstuffs storage compartment |5| by means of the W-shaped conduit |15 and its associated cooling hns.V

' The difference in temperatre between the compartment |54 and-the compartments |52 and |53 results from the fact that the compartment |-54 is not as fully insulated as the compartments |52 and |53 and also ,becauseof the yfact that only the'short conduit sections |10 and '|1| are provided torefrigerate the compartment |54. That portion of the evaporator represented by the W-shaped conduit |15 will operate at a tem- "We claim:

from -view and additionally serving to convey heat to the conduit from compartment 5|. f

" A further example of variations in structure within the scope o f the invention is the construction of the evaporator and insulating and other enclosing structure as a unitary assembly apart from the cabinet, and in such.manner that this unitary assembly can be inserted through a proper sized opening in the cabinet along with the main refrigeration apparatus. Thus, it vwill'be unnecessary to provide a specially designed cabinet having interior insulated partitions as now shown in the drawings, since such partitions will be attached to the evaporator and 'window closure element prior to the .insertion of the apparatus within the cabinet. It will of course be apparent any one or all of the embodiments shown can be so constructed. Still other varia-` ;tions within the scope of our invention will beyduit |15 and its associated cooling fins.

' While the inventionhas been illustrated and .described herein in considerable detail, various changes may be made in the form, construction and arrangement "of parts without departing from the spirit of appended claims.-

1. Refrigerating apparatus including an insu-4 lated cooling chambena pair of laterally spaced yfreezing compartments arranged in said cooling chamber on opposite sides thereof to provide an air circulation channel extending substantially 'the full depth of said chamber therebetween, and

a cooling apparatus having a cooling unit in each of `said compartments and a cooling unit ar-l ranged to refrigerate air flowing through said chamber and said channel.

. perature appreciably above that prevailing in the he inventionor. the scope of the' 2. Refrigerating apparatus including an insulated cooling chamber, a pair of laterally spaced freezing compartments arranged in said cooling chamber on opposite sides thereof to provide -an air .circulation channel extending substantially the full depth of said chamber therebetween, cooling means having a first part for cooling said compartments and a second part, theairilowing therebetween, said air circulation channel being accessible from the exterior of said cooling chamber whereby material to be refrigerated may be placed between said freezing compartments.

3..Refrigerating apparatus comprising an insulated cabinet having a storage compartment, a pair of individual insulated chilling housings po- Am-sitioned in the upper corners of said compartment and spaced frm"'the sideeandtop walls thereof and from each other, a cooling unit in each of said insulated housings, and a cooling unit arranged to refrigerate the air between said housings whereby the air within said compartment may flow upwardlyvalong the side walls and across the top wall thereof Aand then ow downwardly between said housings as it is being cooled in a path extending substantially the full depth of said storage compartment.

4. Refrigerating apparatus comprising an insulated cabinet havinga storage compartment, a pair of individual insulated chilling housings positioned in the upper corners of said compartment and spaced from the side and top` walls thereof and from each other, means foil refrigerating each of said housings, and means for re- -frigerating the air between said housings whereby the air within said compartment may flow upwardlyalongthe side walls and across the top wall thereof and then ow downwardly between said housings as it is being cooledv in a path extending substantially the full depth of said storage compartment, the arrangement being such that articles to be refrigerated may be placed between said housings to be refrigerated by the air stream flowing therebetween.

' 5. Refrigerating apparatus comprising a cabinet includingran insulated storage chamber, a

pair of spaced freezing chambers vin said storage chamber, means for freezing chambers, means for refrigerating the space between said freezing chambers, means forrefrigerating the air in said storage chamber, and

means for allowing or preventing at will communication between said storage chamber and l the space between said -freezing chambers.

6. Refrigerating apparatus comprising a. cabinet including an insulated storage compartment, a'pair of spaced freezing chambers in said storage compartment, said chambers being insulated Y except on their adjacent sides. evaporator means positioned within said chambers for refrigerating the interior thereof. means providing 'a poor thermal bond between .said Vevaporating means and sides of said chambers, said l chambers being spacedvf-rom the top and side 4 'walls 'of said storage chamber to Vprovide cooling 'airpassageways therebetween.

'1. Refrigerating -apparatus comprising an insulated refrigerating compartment, a pair of lat- `erally spacedv freezing chambers insulated except for theirv facing side walls, evaporating 70 for refrigeratingthe, interior thereof, means 'providing spoor heat transferlpathbetween said mrrrtms'sm the animals@ed nu f said chambers whereby id wins serve refrigerating each of said mounted adjacent the lower edges of said uninsulated walls, saidtroughs being set outwardly ofthe space between said walls and out'of the path of air owing therebetween.

9. Absorption lrefrigerating apparatus com- V`"prisinguninsulatedcabinet. )i plurality of spaced freezing chambers mounted iaidvcabinet to provide cooling airflow paths-therebetween, an inert gas circuit including an absorber and an evaporator having freezing sections in each of said chambers, a solution circuit including a. generator and saidabsorber, and means for liquefying refrigerant vapor produced in said generator and for. supplying the liquid refrigerant to said evaporator, said evaporatorincluding a' section for refrigerating the air in said cabinet.

10. Absorption refrigerating apparatus comprising an insulated cabinet, a plurality of freezing chambers mounted in' saidcabinet, an inert gas circuit including an absorber andan evapporatorhaving freezing sections in Ieach of said chambers, a solution circuit including a generator and said absorber, means for liquefying refrigerant vapor produced in said generator and for supplying the liquid refrigerant to said evaporator, a power driven c irc'ulator in said inert gas circuit arranged to propel inert vgas through said evaporator at a velocity sumcient .to propel the refrigerant there ugh by the frictional drag of the inert gas, van means for refrigerating the ,air in said cabinet.

11. Absorpion refrigerating apparatus compris- 4 5 ing an insulated cabinet, a pair of freezing chambers in said cabinet arranged to provide a space therebetween accessible from the front of said cabinet for refrigerating tall receptacles and the -like and to form an air flowchannel for the air 50 within said cabinet, an inert gas circuit including an absorber and an evaporator having freezing sections in each of said chambers and a section for. refrigerating the air in said cabinet, a

solution circuit including a generator and said 55 absorber. and means for liquefying refrigerant vapor produced in said generator and for supply- .ing the liquid refrigerant tosa'id evaporator.

12. Absorption refrigerating apparatus comprising'an insulated cabinet, a pair of spaced freezing chambers mounted in said cabinet to form an air nue and refrigerating chamber therebetween, an inert gas circuit including an absorber and an evaporator including `a substantially horizontal freezing coil section in each of g5 said'chambers and a section for-cooling the air in vsaid cabinet, a enculadas pump in said inert gas circuit adapted to vpropel the inert gas through said evaporator with a velocity sufficient to sweep the refrigerant liquid therethrough as it is evaporating. a solution circuit including a genmm 9083101124 .Wit-bln Said freelilli mbe .eratnr and said absorber, and means for liduefying refrigerant vapor. produced in said generator and for supplying the liquid to said evaporator.

13. Absorption refrigeriltingV apparatus com- "le an cabinet, pair of spaced freezing chambers mounted in said cabinet to form an air flue and refrigerating chamber therebetween, an inert gas circuit including 'an absorber and an evaporator including a substantially horizontal freezing coil section in each of said'chambers, receptacle supporting shelves in said chambers overlying and in heat conducting relationship with the freezing coilstherein, a cir-- culating pump in said inert gas circuit adapted to propel the inert gas through said evaporator with a velocity sufficient to sweep the refrigerant liquid therethrough as it is evaporating, a solution circuit including a generator and said absorber, means for liquefying refrigerant vapor produced in said generator and for supplying the liquid to said evaporator, said evaporator also including an air cooling section within said cabinet for refrigerating the air therein.

14. Absorptionrefrigerating apparatus comprising an insulated cabinet. a pair` of spaced freezing chambers mounted in said cabinet to form an air iiue and refrigerating chamber therebetween, an inert gas circuit including an absorber and an evaporator including a substantially horizontal freezing coil section in each of said chambers, a circulating pump in said inert gas circuit adapted to propel the inert gas through said evaporator with a velocity sufficient bers, and a single upstandig heat conducting plate thermally bonded to said cooling conduit for reirigerating the air within said chamber. 18. Refrigerating apparatus comprising an i-nsulated refrigerating compartment, a freezing to sweep the refrigerant liquid therethrough as it is evaporating, a solution circuit including a generator and said absorber, means for liquefying refrigerant vapor produced in said generator and for supplying the liquid to said evaporator, said. evaporator also including an air cooling section provided with cooling il-ns and positioned beneath 3', said chambers to refrigerate the air in said cabinet, said evaporator and inert gas circuit being so arranged that the inert gas and refrigerant liquid traverse the freezing sections of said evaporator before traversing the air cooling section thereof.

15. Absorption refrigerating apparatus comprising an insulated cabinet, a pair of insulated freezing chambers mountedwithin said cabinet in-spaced relation to each other and to the rear wall of said cabinet to deilne central and rear air passageways in said cabinet, an inert gas circuit including an absorber and an evaporator having sections in each of said chambers and a section in said rear air passageway connecting said first mentioned sections, a solution circuit including a generator and said absorber, means for liquefying refrigerant vapor produced in said generator and for supplying the liquid to said evaporator, and a large upstanding heat transfer chamber within said compartment and spaced from one wall thereof, a refrigerating mechanism including a cooling unit having a section mounted within said freezing chamber and an ai'r cooling o section mounted between the wall of said chamber and said onegwall of said compartment, the balance of said refrigerating mechanism being positioned exteriorly of said compartment, said one compartment wall including an opening of a 5 size to admit said cooling unit sections, the wall of said freezing chamber adjacent said one compartment wall having an opening of a size to admit the section of said cooling unit provided therefor, aridclosure elements for said wall open- 0 ings mounted on said cooling unit.

19. nerrigeratmg apparatus comprising an insulated storage compartment, a pairof laterally spaced refrigerating chambers in the upper portion of said compartment, a refrigerating mechanism comprising a cooling unit having sections positioned in each of said refrigerating chambers, a section positioned beneath said chambers' .to refrigerate the air in said compartment, and a section arranged to refrigerate the space between 0 said chambers.

20. Refrigerating apparatus comprising an insulated structure including a refrigerating compartment, a pair of laterally spaced chilling chambers in the upper portion of said compart.

,. ment, refrigerating mechanism associated with said cabinet including cooling elements arranged to refrigerate said chilling chambers, the air within said compartment and the space between said chilling chambers, and means for allowing 0 and preventing flow of air between said compartment and the space between said chilling material to be refrigerated therein.

2l. Absorption refrigerating apparatus conit prising a refrigerating compartment, a pair of spaced chilling chambers, an evaporator including a conduit in each 0f said chambers and a conduit extending between said chambers and conduits with a velocity and pressure suilicient compartment including a cooling unit in each of said freezing chambers and a cooling unit in the space between said freezing chambers to refrigerate the air ilowing therebetween.

17. Refrigerating apparatus comprising an insulated refrigerating compartment, a pair of lat- Aerally'spaced freezing chambers positioned withing said compartment, a refrigerating mechanism associated with said compartment including cooling units in each of said freezing chambers and at least one cooling conduit extending across said compartment rearwardly of said freezing chamserially connecting the conduits positioned therein, means for supplying refrigerant liquid to the conduit in one of said chambers, and means for propelling an inert gas through said evaporator to distribute the liquid refrigerant therethrough by the frictional drag of the inert-gas flowing thereby. l

22. Refrigerati-ng apparatus comprising an ino sulated refrigerating compartment, a pair of laterally spaced freezing chambers having one un-y insulated side wall, means for refrigerating said freezing chambers comprising horizontal shelflike freezing coils positioned in each of said chambers in spaced relationship with the walls thereof, and receptacle supporti-ngV plates overlying and in heat conducting relationship with said coils and with the uninsulated side walls of said chambers at their edges to provide a poor heat conducting path between said coils and said uninsulated side walls whereby said walls serve to cool the air within said compartment without subjecting the air to extremely low temperatures.

23. Absorption refrlgerating apparatus com- 5 prising arf insulated cabinet. a plurality of freez- 8 2,828,189 I t ing chambers `rnoimted in` said cabinet, an inert said cabinet'for refrigerating Vtall receptacles and gas circuit including an absorber and' an evapthe like and-"to-forxn an air nowchannel for the orator, said evaporator including a plurality of air within said cabinet, an inert gas circuit inhorizontal conduit sections in each of said freezcluding an absorber and an evaporator, said evapins chambers Vililetiy underlying and refriserat- 5 orator including a plurality of horizontal conduit ing shelf-like elements adapted to support freezsections in each of said freezing chambers di- .ins receptacles and the like and a conduit posirectly underlying and refrigerating shelf-like elev tioned between said chambers for refrigerating ments adapted to support freezing receptacles the air in said cabinet, a solution circuit includand the like and a conduit positioned between i-ng a generator and said absorber, means for lo said chambers for Vreirigeratixig thel air' in said supplying refrigerant liquid to said evaporator cabinet, a solution circuit including a generator at substantially the -level-atlwhich inert gas is and said absorber, means for supplying refrigsupplied thereto, and a power driven circulator Ve1-ant liquid to said 'evaporator at substantially in said inert gas circuit arranged to propel inert the level at whili'inert-gas is supplied thereto, gas through said evaporator at avelocity suiiicient '15 and a power driven circulator in said inert gas to propel the refrigerant liquid therethrough b circuit arranged to propel inert-gas through said the frictional drag of the inert gas. evaporator at a velocity sumcient. to propel the 24. Absorption refrigerating apparatus conirefrigerant liquid therethrough by the frictional prising an insulated cabinet, a pair of freezing dragof the inert gas.

chambersin said cabinet arranged to provide a 20 GEORGE A. BRACE. space therebetween accessible from the iront of G. GROSS.

CERTIFICATE. O F CORRECTION.

' August 51, 191g.

Patent Np. "2.528189# GEORGE A. BRAOE, ET AL.'

It is hereby certain-Od that erro'appears in the'pripted 'specificationx loftlfxealwcfe numbered' patent reqgl'ring Oorrection asfollows: Page 5, gggand ingqrt mandame syllable gna'wordsV `comq apparent to than killedA n.thelart.' p aQ`16, -ecopd column, vlinea Olgim 1l, for "Absorpiong A ad sqrptionu and mit the sam' Lette's Patent should be readiitn thiuxcorrection ther'ein that the same may' conform -to the .recom of tzhecgs

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