US2363447A

US2363447A - Refrigeration

Info

Publication number: US2363447A
Application number: US399630A
Authority: US
Inventors: Arnold D Siedle
Original assignee: Hoover Co
Current assignee: Hoover Co
Priority date: 1941-06-25
Filing date: 1941-06-25
Publication date: 1944-11-21
Anticipated expiration: 1961-11-21

Description

1 Nov. 21,1944.

A. D. SIEDLE REFRIGERATION Filed June 25, 1941 N IO 3 vSheets-Sheet 1 Fiy] INVENTOR Arnold D-Siedlc Nov. 21, 1944. A; D. SIEDLE REFRIGERATION Fil'ed June 25, 1941 s Sheets-Shet z INVENTOR Arnold D. Siedl SMM ' ATTORNEY 4 Nov. 21, 1944. A; D. SIEDLE REFRIGERATION Filed June 25, 1941 3 Sheets-Sheet 3 N INVENTOR irnoldfi. Siedle 5, EkaM ATTORNEY Patented Nov. 21, 1944 Arnold 1). Siedle, Cleveland Heights, Ohio, as-' signor to The Hoover Company, North Canton;

Ohio

Application June 25, 1941, Serial No. 399,630 g 3 :30 Claims. (01 62119.5)

This invention relates to the art of refrigeration and more particularly to a novel threefluid absorption refrigerating machine. Previous absorption refrigerating machines present an extremely difficult problem of design to maintain the same within the rigid space 'limi-L tations imposed upon'co'mmerciall'y acceptable kitchen appliances. This arises from the fact that prior machines require the provision of a vertically extending cooling air flue alongthe.

back wall of the apparatus which consumes an appreciablequantity of the depth available" for the apparatus. Previous machines are also at a considerable disadvantage because of the necesmetal framework which will support the evaporator, condenser and rectifier at a height appreciably above the height at which the boiler-ab sorber and circulating fan are positioned. This parts of three-fluid refrigerating machines are very heavy;

Accordingly, it is an object of the present in-" vention to provide athree-fluid absorption refrigerating apparatus in connection with a, cabinet constructio-nfor housing the same which will totally eliminate the rear flue and will place all parts of the refrigerating apparatus within the projected. area of the cabinet proper.,

It is a further object of the present invention to provide a three-fluid air-cooled absorption refrigerating system in which the entire refrigerating mechanism excepting, the evaporator and its connecting conduits is located within the confines of the cabinet walls beneath the. food storage compartment in which the evaporator is. positioned in the lower part of the storage compartment and is connected to the refrigerating mechanism per se'by' short direct conduit connections. his a further object of the present invention to provide an absorption refrigerating machine of the three-fluid type which is so constructed and arranged that the necessity fora heavy elongated supporting frame is totally eliminated.

machine. so constructed and arranged that this may be positioned beneath the food" storage com- It is a further object of the present invention to provide an absorption refrigerating apparatus of the type above described in which the air withsity of providing a heavy, cumbersomeyrigidzm in the food storage compartment'is circulated positively" over the air cooling surfaces of the evaporator. i

. It is still another object of the present invention to provide an absorption refrigerating apparatus of the three-fluid type arranged for assembly in a domestic refrigerator cabinet which is characterized in that the same is extremely compact and has a minimumvertical height.

It is a further object of thepresent invention to provide a refrigerating apparatus so constructed and arranged that the entire operative mechanism may be completely assembled and tested in a low height assembly which includes the botframe must be very strong because the various" lto provide an absorption refrigerating machine in whichall portions of the operative refrigerat- It is a further object of the present invention toprovide av three-fluid absorption refrigeratingv partment' and may be air cooled without the necessityof providing a flue structure along one vertically extending wall ofthe cabinet and without increasing the dimensions of the cabinet in any direction taken in a horizontal plane over those required to enclose the food storage space in an insulating wall. I

tom portionof the cabinet and which may be assembled with theside, top, front and rear walls of the refrigerating space by lowering the aforesaid walls of'the refrigeratedspace, over the assembled refrigerating mechanism and securing the two together.

It is a further object of the presentinvention ing mechanism are located in the space. below the food storage compartment and in the lower part of said compartment andin which the air cooled condenser for the apparatus is placed within a pocket in the-lower rear portion ofaside Wall of the apparatus which pocket is so arranged that no part of the apparatus projects beyond the horizontal dimensions of the cabinet proper.

It is a further object of the present invention to provide a three-fluid absorption refrigerating machine in which all operative parts of the apparatus are located in the lower portion of and below the food storage compartment which are so constructed and arranged that the samemay be assembled with the cabinet simply bysliding the same into the cabinet construction from'the' rear thereof.

Other objects and advantages of the invention will become apparent as the description proceeds when taken in connection with the accompanying drawings in which- I Figure 1 is a front elevational sectional view of one form of the invention;

Figure 2 is a side elevational, view partly in section of the arrangement shown in Figure 1;

Figure 3 is a front sectional elevational view of a modified form of the invention;

; Figure 4 is a side elevationalviewpartly in section of theapparatus shown in Figure 3;"

Figure 5 is a front elevational view partly in section of another modification of the invention; and

Figure 6 is a side elevational view partly in section of the apparatus illustrated in Figure 5.

In Figures 1, 3 and 5 certain heat rejecting fins have been omitted to clarify the drawings. These fins have been shown in companion Figures 2, 4 and 6, respectively.

Referring now to the drawings in detail and first to Figures 1 and 2 thereof, there is disclosed an absorption refrigerating apparatus .of .the

three-fluid type associated with a suitable cabinet structure. Only the lower portion :of .thezcabinet structure has been illustrated-asthepart thereof.

above the break line is simply a conventional :chamber I! which is connected to the bottom cabinet structure to form a chamber for thestorage of foodstuffs and the like to be refrigerated.

A three-fluid absorption refrigerating machine is associated with this cabinet construction and comprises a boiler.,B,.,an. analyzer D, a tubular inclined air-cooled rectifier R a tubular. inclined air-cooled condenser C, an evaporator J structure It, a horizontal multi-pass gas heatexchanger G,

an inclined tubular air-cooled absorberA, asolution reservoir S, a liquidheatexchanger L, and a gas circulating. fan .or. pump F which, is driven by ,an electrical motor Theseelements are suitably interconnected by various conduits .or the like to be described morefully hereinaftentoform a plurality of gas and-liquid circuits constituting a complete ,threeefluid absorption refrigerating.

machine.

The above described apparatus will be charged with a suitablerefrigerant such as ammonia, a suitable solvent, therefor; such as Water, and a pressure equalizing,- medium which isinert with respect to the-refrigerant in. the absorbent, preferably a dense gas likenitrogen.

,A-esuitablecontrol mechanism, not shown, will be provided to-regulatethe, operation of the electrical motor M and the heateryHuwhich is arranged to supply heat totheboilerB. A preferred control mechanism is disclosed by; Patent No.

D in ,counterflow.relationshipiand in contact with solution flowing. downwardlythrough the analyzer to the boiler. After passing through the analyzer theresult-ing refrigerant vapor is conveyed from the analyzer to the. upper portion of :the condenser C by means of the conduit 11 which has a finned sectionforming the air-cooled rectifier R.

Therefrigerant vapor supplied to the condenser C is converted into the liquid state therein by heat exchange with cooling air flowing over the fins on the condenser. The resulting liquid refrigerant flows from the bottom. portion of the condenser C .throughaconduit 12. to the bight portion of a U-shapedconduit la forming a twin gas lift elevating pump. Conduit I2 is vented to the gas'heat exchanger G by a vent conduit 19. The lower portion of the conduit 13. is positioned at an elevation belowthe bottom portion of the condenser "inorder to insure that :the samewill be flooded with liquid and to provide an adequate I portion of the' evaporator E by means of a conduit [8.

The leansolution formed in the boiler by the generation'bf refrigerant vapor is conveyed therefrom to the solutionreservoir S by way of the conduit 20, the liquid heat exchanger L, and

the conduit 2| which includes a finned air-cooled section which serves as a solution pre-cooler. Thereservoir S is vented by means of a conduit .22 to. the suction conduit 23. of the circulating fan. The solution is conveyed from the reservoir s to the upper portion of the tubular absorber A adjacent its point of connection with the conduit .23 by means of aconduit 24 whichconnects to .the bight portion, of a Ueshaped twin gas lift pump conduit 25. Thebight portion of the conduit 25 is positioned below the liquid level normally maintained in the boiler-analyzer solution reservoir assembl in order to provide an operative depth of immersion for the gas lift pump.

Pumping gas is supplied. to the vertically .extending legs of-the U-shaped conduit 25 from the fan discharge conduit [6 by: means of a conduit 26- and an invertedv U-shaped conduit 21 which opens intothe legs of the conduit 25.v wherefore the absorbing solution is :elevated from the reservoir into the absorber by gas lift action. Due to .the fact that the reservoir S is vented through :the conduit'22 to-the suction side of the circulating fan the entire pressure of the fan is available for operatingthe pump. 7

The absorbingsolution which is supplied to the upper end of the tubular absorberfiows downwardly therethrough by gravity incounterflow relationship with a mixture of inert gas and refrigerant vapor which is supplied to the lower end of the absorber in'a manner to be described hereinafter. The solution absorbs refrigerant vapor from the mixture and the resulting heat of absorption is rejected to cooling air flowing across the exterior walls of the absorber conduit and the fins mounted thereon.

The enriched solution which collects in the lower part of the absorber is conveyed therefrom to the upper portion of the analyzer D by way of the conduit 28, the liquid heat exchanger L, and

the conduit 29, thus completing the absorption solution circuit.

The circulating fan F-receives lean pressure equalizing medium from the absorber through the conduit 23, places the same under pressure and discharges the gas thus placed under pressure through the conduit I6 into the outer path of the gas heat exchanger G. As shown, the

gas heat exchangeris a multipass baffled type -which provides for considerable turbulence in the gas stream flowing therethrough and insures good heat exchange between the two streams of gas. After traversing the gas heat exchanger the inert gas is conveyed therefrom to the bottom portion of the evaporator E by way of conduit 3|, gas separation chamber l1, and conduit l8.

' z The outer, lean gas. passof the gasheat exchanger has an appreciable resistance. This drop in the gas in the lean gas side of the gas heat exchanger.

As illustrated, theevaporato E comprises an I elongated conduit of relatively small diameter which is coiled to form three horizontally extending coil sections which are adapted to underlie andrefrigerate ice tray supporting plates and I which are serially connected b-y vertically extending'riser' conduits. I This evaporator is of the general type disclosed and claimed in the co- I pendingapplication of Curtis C. Coons, Serial No. 386,394, filed April 2, 1941, now Patent No.

2,328,195, dated August 31; 1 94 This evaporator is of the type in which the inert gas and liquid refrigerant are both supplied to the bottom portion thereof and'in which the inert gas circulates through the evaporator at a highvelocity which is sufiicient to circulate the liquid through the evaporator and to elevate the same upwardly between the various vertical- 1y spaced horizontal sections thereof by the frictional drag of the inert gasstream flowing over and through the liquid.

After traversing the evaporator'the' liquid is conveyed from the upper portion thereof .by means. of the conduit 33 to a vertically extending finned relatively large diametenevaporator coil 34. The liquid refrigerant flows downwardly through the coil 34 in parallel fiow relationship with'the inert gas. The inert gas and any un-' evaporated material are conveyed from the bottom portion of the coil 34 to the inner'pass of the gas heat exchanger G by means of the coninner path of the gas heat exchanger and is conveyed therefrom to the bottom portion of the absorber A by means of the conduit 36. The manner in which the inert gas refrigerant vapor mixture passes upwardly through the absorber in counterflow relationship with the absorbing solution has already been explained in connec- .tion with the absorbing solution circuit. This f completes the inert gas circuit.

40 which includes'an' upper insulated food stor age compartment 4| and a lower uninsulated mechanism compartment42. The compartment 4| is provided with an insulated closure 43 and an insulated lower wall 44' which is removably connected to the vertically extending wall of the chamber 4| in a manner to be more fully described hereinafter'; I The chamber 42 is formed within a base framework45 which includesthewall 44 of the chamber 4|. Thebottom portion of the. base frameduit 35. The inert gas then passes through the i work is open to allow free flow of cooling air q thereinto-from the floorlevel as is indicated in Figures 1 and 2. The rear and side edges of the insulated plate element 44 are stepped as indicated at 46 to cooperate'with complementary steps 41 formed on the lower ends of the side and rear walls of the compartment 4|.

v This forms a secure seat for the walls of the 'ment 4|. The wal144may be suitably secured to the rear and side Walls of the chamber 4| by bolts, clips, stays or the like, not shown.

The boiler assembly, solution reservoir, boiler heater motor fan unit, absorber, condenser and rectifier aresupportedinthe chamber 42 by a box frame 49, only a portion of which is shown. It Will be understood that this box frame will include vertically extending elements to which the absorber, motor circulator and the like will be suitably secured as by welding either directly or by welding short'supporting rods to the frame and to the supported element. The boiler absorber liquid heat exchanger assembly is encased in a blanket of insulating material indicated at 5| and simply restsupon the bottom of the frame 49 to which of course ity is suitablysecured as by Welding or the like. l v

It may readily be seen from an inspection of Figures l and 2 the absorber is positioned in the front portion of the chamber 42, andinclined downwardly and rearwardly therein; The condenser is positioned at a slightly higher elevation in the upper rear portion'of thechamber 42 and inclined downwardlyand rearwardly therein. It will be understood that the individual condenser and absorber tubes are inclined with respect to each other as well as generally inclined downwardly in order to provide downward liquid flow in each case. Cooling air enters the bottom portion .of the chamber 42, flows substantially vertically across the absorber and condenser and then exits from the chamber 42 through the opening 52 in the'rear wall thereof. However, if desired, suitable' openings 'or louvres-may also be, provided in-the side walls of the chamber 42. The boiler is provided with a waste products of combustion flue 53, shown broken, which will be provided with a suitable outlet to the opening 52 but to one side of the outlet for the condenser and absorber cooling air: in order not to cause interference between the cooling air for theabsorber and condenser and the Waste products of combustion. The gas heatexchanger G. as is seen in Figures 1 and 2, is embedded in the insulation of the plate 44. l

The freezingevaporator E is positioned in the lower left hand corner of the chamber'M, as is shown in. Figure 1. This evaporator is "encased in a suitable housing 59 which will conceal the coil 32 and the tray supporting shelves. ice trays and the like. The aircooling evaporator 34 is positioned along the'right hand wall, as viewed in Figure 1, of

the. compartment 4| in the lower part thereof and-is separated'from the remaining portion of the compartment 4| b'ya vertically extending'plate or partition 5!) which, however, terminates short of'the bottom wall of the compartment 4| in order to allow air to enter the channel or flue housing the coil 34.

Positive air circulation across the air cooling coil and through the'food storage compartment is provided by meansof 'a propeller blade fan 54 which is positioned adjacent the panel 44 beneath the coils 34 and the front and rearwalls adjacent the right hand in Figure 1. The fan 54 about midway between of the compartment 4| wall thereof, as viewed is driven by a suitable electrical motor"55which is partially embedded in the lower side oi the panel 44 and is connected to the fan by means of a shaft 56 which passes throughthe panel- 44. Thus, rotation of the fan blades 1 54' circulates air upwardly between the partition 50' and the adjacent side wall of the chamber 4| across the evaporator coil 34 and its associated'fins. This provides positive circulation of the air within the compartment 4|.

Electrical energy is supplied to the electrical motor ii by the electrical conductors 51 which include the thermostat 58 positioned to be responsi-ve' to the temperature of the air within the chamber 4|. The thermostat 58 is so constructed and arranged that'the same will energize the motor" 55 wherr'the': temperature of the air within thecompartment' 4| exceeds apredetermined value and will de-en'ergize the motor 55 whenithe temperature of the air within said compartment drops below: another predetermined value. Thus'theapparatus is arranged to maintain the temperature within the food storage space 4 l withindesired limits.

In assembling the apparatus the entire refrigerating mechanism is assembled together with the frame 49, thebase structure 45 and the walls of the compartment 42 and the panel 44, This assembly will includethe evaporators, their connecting conduits-and the air circulating fan and motor. This apparatusmay then be tested in this condition. After complete assembly of this apparatus the cabinet 40 is then swung over the aforesaid assembly and is lowered into position upon the stepped shoulders formed on the edges of the panel after which the upper cabinet construction is suitably secured to the lower mechanism assembly and the apparatus is completed.

This assembly and construction totally eliminates the rear flue customarily provided in refrigerating systems of this type wherefo're with this construction absorption refrigerating machine cabinets and the like may be made in standard sizeswhich do not exceed the permissible depth of kitchen appliances while providing standard depth within the food storage compartment. The apparatus is much more compact than prior constructions and results in a very appreciable saving in weight and in fabrication costs. Another feature of considerable advantage possessed by the instant-construction resuits from the fact that the apparatus does not require the. usual heavy elongated supporting frame which extends upwardly alongthe back wall of the cabinet in the usual cooling air flue.

It is characteristic of this invention that all the mechanism lies within the projected area'of the normal food storage compartment .and its normal surrounding wall, nothing projects there beyond. It is also characteristic of this form of the invention that the condenser is positioned in the mechanism compartment along with the absorber, boiler and circulator assembly and that the liquid refrigerant is positively elevated from the condenser to the bottom portion of the evaporator through which it is upwardly propelled by the inert gas as it is evaporating. This construction greatly promotes a compactness of assembly of the apparatus and efiiciency of operation thereof.

Referringnow to Figures 3 and 4, there is disclosed a modified form of the invention. Certain parts of this form. of the invention are identical with parts of the form of the invention described in connection with Figures 1- and 2, and they are therefor'e'given the same' reference characters primed.

In this form of the'invention, the cabinet 40 is provided with a rear wall 6|) which is provided with arr-inwardly formed recess 6| which receives the condenser C' and apart of the vertically extending rectifier R. Consequently, in this form of the invention the vapor conduit H- extends irom the analyzer D to the upper portion of the condenser C' which lies within the recess 6|.

The solution circuit in this form of. the invention is identicalin all respects with the solution circuit described in connection with Figures 1 and 2 and need not be further described herein.

The inert gas circuit in this-form of the invention is also identical with the inert gas circuit described in connection with Figures 1 and 2,

except that the liquid. refrigerant is supplied, 'in a manner to be described hereinafter, to the evaporator without the operation of a gas lift pump and the evaporator sections are arranged differently in the cabinet though the parts thereof are identical with the parts of the evaporator described in connection with Figures 1 and 2.

The liquid refrigerant is conveyed from the bottom portion of the condenser to the conduit 3! which conveys inert gas from the gas heat exchanger into the bottom portion of the evaporator E by means of the conduit 62 which includes a downwardly extending U-shaped portion. .The liquid refrigerant flows through this conduit by gravity but a pressure-balancing liquid seal is provided in the condenser side or the U-shaped conduit in order to compensate for the difiference. in pressure existing between the conduit 3| and the condenser C. The condenser side of the conduit 62 is subject to the rich gas side of the gas heat exchanger G by means of a vent conduit 63.

The panel '44 of the cabinet 48 is identical with the panel 44 described in connection with Figures 1 and 2, with the exception that the rear edge thereof terminates short of the rearmost side of the cabinet in order to receive the inwardly recessed portion of the cabinet wall 60 which is set in to form the recess 6 Referring particularly to Figure 3, it will be seen that the evaporator in this form of the invention is arranged somewhat differently from the arrangement disclosed in' Figures 1 and 2. In the present form of the invention, the evaporator El is positioned slightly tothe right, as viewed in Figure 3, of the bottom central portion of the chamber 4| and the finned air-cooling portion. of the evaporator is positioned in the narrow flue-like space provided between the right, as viewed in Figure 3, wall of the cabinet 49 and the adjacent side wall of the evaporator casing, thus tending to form a vertically extending fiue'for coolinglairso arranged that the propeller blade fan 54' will project the air upwardly across the cooling evaporator 34'.

This form of the invention is assembled exactly in the manner described in connection with the form of the invention disclosed in Figures 1 and 2. The cabinet 4B is simply lowered downwardly 1 over the bottom mechanism assembly until the

shoulders

46 and 41 engage after which the two parts of the cabinet are suitably secured together.

In this form of the invention the gas lift pump and the separation chamber between the evaporator and condenser are eliminated and the liquid refrigerant is supplied to the bottom pori tion of the evaporator by gravity. The arrangement of the condenser in a rear pocket slightly decreases the available space within the food storage compartment but it improves the cooling efiiciency of the system as the condenser and absorber are cooled by'entirely separate and distinct air streams in this form of the invention, also the mechanism compartment underlying the storage'chamber is less complex than in the form of the invention disclosed in connection with Figures1to3. T

- It is characteristicofthis form of the invention, however, like thatv described in connection with Figures 1 and 2, that the entire apparatusis positioned within. the. horizontal projected area of, the normal storage space of the refrigerator compartment-wherefore the, need for a rear air fiue, a heavy frame extending therealong and the like are totally eliminated from the machine withoutimpairing its efiiciency and without materially reducing the storage space in the cabinet. Also the evaporator arrangement of this form of the invention is more compact than that disclosed in connection with Figures 1 and 2.

Referring now to Figures and 6,'there is disclosed a third form of the invention. Many parts of this form of the invention are identical with parts heretofore described in detail in connection with Figures land 2 and they are therefore given the same reference characters double primed. This'form of the invention differs from the forms of the invention described heretofore in the arrangement of the evaporator, circulat ing fan and gas heat exchangerwithrespectto the cabinet,.in themanner in which the mechanism is assembled with the cabinet and in a few details of construction. I q

The absorbing solution circuit is identical in all respects with the form of the invention illustrated in Figure 1. 3 v

Likewise, the inert gas'circuitis identical in all respects with the form of the invention illustrated in connection with Figure 1,- except as to the location of certain parts which Willbe described in detail hereinafter.

In .this form of the invention, thecabinet includes a lower Wall structure 66 which is part of the cabinet structure proper and is provided of the twin gas lift pump 'II' by means of conduits l5" and I4 whereby to..elevate the liquid refrigerant by gas lift action into the separation chamberr The liquid refrigerant and inert gas passfrom the chamber ll" into: the bottom portion of the evaporator E through .the'conduit I8 through which the liquid refrigerant is propelled by the gas stream. Theliquid refrigerant is propelled upwardly through the evaporator E" by the high velocity gas stream in the manner described in connection with the evaporators E and E";

'rhe aircooling evaporator 34", in this form of the invention, is. positioned directly behind the evaporator E" and its associated casing, and it Will be noted that the evaporator E is positioned in the bottom'central portion of the food storage compartment 4|". I l The evaporator 34 '91s provided with the usual vertically extendedfins which are positioned in a vertically extended airichannel, one .side of whichis'formed by therear wall of the'casing of the evaporator E" and the'other side'of which is formed by a (vertically extending ,pan'el I4 which extends from :a' point adjacent the upper ends of the fins to" the bottom thereof. The fins terminate above the bottom wall .of'the compartmentdl- A second verticallyv extending channel is? provided between the're'ar face of .the panel 14 and a panel 18. Theiupper end of this channel is closed by a short panel 12 and the bottom end of both channels is closed by a panel 13. The panel 18 is spaced from' the inner face of the. closure plate 68 andis'provided with an opening 715 which is positioned adjacent the central portion of a centrifugal fan 16 which is driven by an electrical motor H which is embedded in the insulation of the'panel 68.

As may readily be seen from Figure 6, the air in the compartment 4|" passes downwardly across the evaporator conduit 34 and its associated fins rearwardly under the lower edge of panel l4, upwardly in thechannel between panels it and 18, through the opening 15 into the cenwith anopening'fil in its rearv wall whichis designed to be closed byan insulated panel elederstood that in this form of the invention, the

base, the walls of the mechanism chamber and the base platev are part of the cabinet assembly and not, a part of the refrigerating mechanism assembly as in the forms of the invention previously described. v

In this form of the invention also the gas heat exchanger G" is positioned in, the rear, upper corner of the mechanism compartment 42 The liquid refrigerant, discharging from the bottom portion of the condenserC flows through a conduit 10 into the bight portion of 'a U-shaped gas lift pumping'conduit H, the vertically extending legs of which discharge into-a separation chamber ll. which is positioned in the insulationof the panel element68; Pumping gas s l ed t he; ertica l x e in e tral" portion of; the centrifugal fan :16 from which it is discharged upwardly through a passageway formed between the panel '68 and the plate '18. Therefore, the air within the food storage'compartment M is positively circulated by the circulating fan l6.- It will be understood that the motor T! will be controlled in exactly the same manner as the motor 55, described in connection with Figure 1, is, operated and controlled.

In this form'of the invention all parts to be. operated, as well the gas heat exchanger and rectifier, are positioned beneath the panel 66 of the compartment 4| and the cooling air discharged through the rear wall of the mechanism compartment 42". In assembling theapparatus, the frame structure 49" is assembled with the entire refrigerating mechanism, and will include,- of.course,flthe,panel 68 and its associated electrical motor; and it will also include the evaporators and the panels provided to form the air circulation current. When this apparatus is completely assembled, it will be slid into the cabinet structure from the rear thereof which will position the boiler'assembly, absorber, solution reservoir, rectifier, gas heat exchanger and cone denser in the lower mechanism'compartment 42 beneath the panel 66, willposition the panel 68 in the opening 61 in the rear portion of the I food storage compartment, and will position the evaporator and its associated air directing structure within the. bottom portion. ofthe food storage compartment.-.

This. .form.of. the. invention, like these described heretofore, insures that all portions of the apparatus will bemaintainedwithin the projected areaof the-normal dimensions. of the food storage compartmentsand.v it completely .eliminates the necessity forayertical .flue and fora heavy, spacelconsuming metal supporting frame extending upwardly along. the rear. .wall of the cabinet construction; thus. materially reducing waste .material and space consumption.

Thisform of .the invention, however, is. particularly designed. forincorporation incabinets which are to. be..used inenvironments inwhich it not feasible. to. assemble. the apparatus by dropping .the cabinet .construction downwardly over the mechanism.

All formscof the present invention greatly vreduce the .space occupied bythemechanical portions. of absorption;refrigerating. machines compared; to..prior constructions". The assembly of thee apparatus. with. the cabinet. is materially simplified. In. addition, the :present invention provides a noveliarrangement. of; evaporator and condenser .which permits. the condenser to be placedat. an elevationbelow the evaporator and to .be. positionedwithin, the. mechanism compartment customarily providedpin. the cabinet beneath, the. food storage. compartment. This. .is a construction and arrangement which is a radical departure from. .previous. constructions.

While. the .invention has. been illustrated and describediherein. in. considerable. detail, it, is not to. .be. limited. tothe constructional. details. illustrated and,described..., Various changes constrilction, arrangement: and proportionmof .the parts. .may .be made. without departing .from. the spirit.ofrtheiinvention.or .the scope. of, the appended claims.

dlclaimzgm 1. In: a.,.refrigerator,. a cabinet having. an in.- sulated, food, compar.tment.,.and .a mechanism chamber arranged .for-flowaofcooling air therethrough. andentirely .positionedbelow said .food

compartment, an absorption refrigerating mechanismassociatedavith: said cabinet including an evaporatoruinlsaid:compartment, an air: cooled condenser and an :air. cooled ;absorber-in said chamber,.,a;.boiler assembly in. said chamber, meansconnectingsaid absorber and-said boiler assembly forrcirculation. of .absorption solution,- meansconnecting. said absorber and saidevaporator forcirculation:ofxinertgas, and means for conducting refrigerant vapor. from said boiler .assemblyto said condenser and for conducting refrigerant liquid from said condenser to said evaporator. V

2. In a refrigerator, a cabinet having an insulated food compartment and. an underlying mechanism chamber arranged for flow of cooling air therethrough, an absorption refrigerating mechanism'associated with said cabinet includingan evaporator in said compartment, an air cooled-condenser positioned in-a recess formed in a-vertical wallof said compartment, an air cooled: absorberand a boilerassembly in said chamber, means. connecting said absorber and said boiler assembly for circulation of absorption solution means. connecting said absorber and said evaporator for ;.circulationzof inert gas, andmeans forconducting; refrigerant vapor from said-boiler assembly to said condenser. and. for conducting refrigerant. liquid from said condenser to said evaporator.

3.In arefrigerator, a cabinet including structure forming an: insulated .foodcompartment and an underlying mechanism chamber arranged for flow of.cooling-air:.therethrough, an absorption refrigerating. mechanism: associated with saidcabinet including. an evaporator in said compartment: an air cooled condenser, an air cooled absorber and a boiler assembly in said chamber, meansconnecting said absorber and said boiler assembly for circulationof absorption solution, means connecting said asborber and said evaporator for circulation of :inert gas, and means forconducting refrigerant vapor from said boiler assembly to saidcondenser and for conducting refrigerantliquid from said condenser to said evaporator, all of said refrigerating mechanism being within the verticalprojection of the horizontal dimensions of saidstructure forming saidfood compartment.

4. In a refrigeratona cabinet including structure forming an insulated food compartment and annnderlying mechanism chamber arranged for flow of. cooling air therethrough, an absorption refrigerating mechanism associated with said cabinet including an evaporator positioned in the lower part of said compartment and including freezing and air cooling sections, a condenser, an air cooled absorber and a boiler assembly in said chamben means connecting said absorber and said boiler assembly for circulation of absorption solution, means connecting said absorber and said evaporator for circulation of inert gas, andmeans for conducting refrigerant vapor from said boiler assembly to saidcondenser and for conducting refrigerant liquid from said condenser to said evaporator, all of said refrigerating mechanism being within the vertical projection of the horizontal dimensions of said structure forming said food-compartment.

5. In a refrigerator, a cabinet including an openbottomed insulated element adapted to form the side' andtop walls of an insulated refrigerating chamber and a base and mechanism element removably supporting said first mentioned element and including an insulated-panel arranged to interfit with said-first mentioned element to form the lower wall thereof, a refrigerating mechanism associated with-said base element including an evaporator positioned above said insulated panel, an air cooled condenser positioned within theuhorizontal dimensions of said first mentioned element; an air cooled absorber and a boiler assembly positioned below said insulated panel,-and means connecting said evaporator, said absorber, said condenser and said boiler assembly to form-a refrigerantcircuitgsaid base element being constructed and arranged to support said-refrigerating mechanism and said first mentioned element.-

6. In a refrigerator, a cabinet including an open bottomed insulated elementadapted to form the side andtop Wallsof-an'insulated refrigerating chamber-and a baseand mechanism element removably supporting said first mentioned element: and including an insulated panel arrangedto interfit with said first mentioned element to form the lowerwallthereof, a refrigerportion, a drive motor for said fan positioned outsidesaid-refrigerating chamber and partially embedded-in a 'wall thereof; an-air cooledcondenser refrigerant liquid from said condenser to said positioned within the horizontal dimensions of saidfirst mentioned element, an air cooled absorber and a boiler assembly positioned belowsaid insulated paneL-and means connecting said evaporator, said absorber, said condenser and said boiler assembly to form a refrigerantcircuit, said base element being constructed and arranged to support said refrigerating mechanism and said first mentioned element.

7. In a refrigerator, a cabinet including an open bottomed insulated element adapted to form the side and top walls of an insulated refrigerating chamber and a base andmechanism element removably supporting said first mentioned element and including an insulated panel arranged to interfit with said first mentioned element to form the lower wall thereof, a refrigerating mechanism associated with said base element including an evaporator having freezing and air cooling portions positioned above said insulated panel, means forming an air passageway across said air cooling portion 'of said evaporator, an air circulating fan arranged to circulate air over said air cooling evaporator portion, a drive motor for said fan positioned outside said refrigerating chamber and partially embedded in a wall thereof, an aircooled condenser positioned within the horizontal dimen sions of said first mentioned element, an air cooled absorber and a boiler assemblypositioned below said insulated panel, and means connecting said evaporator, said absorber, said condenser and said boiler assembly to form a refrigerantcircuit, said base element being constructed and arranged to support said refrigerating mechanism and said first mentioned element.

8. In a refrigerator, a cabinet structurehaving an insulated food compartment and a mechanism chamber beneath said food compartment and arranged for flow of cooling air therethrough, an

absorption refrigerating mechanism associated with said cabinet including an evaporator in said compartment; an air cooled condenser'positioned in said cabinet within the vertical projection of the horizontal dimensions of said foo'd compartment structure, an air cooled absorber and a boiler assembly arranged in said mechanism compartment,me ans providing for circulation of inert gas between said evaporator and said absorber, means providing for circulation of absorption solution between said absorber and said boiler assembly, means for conducting refrigerant vapor from said boilerassembly to said condenser,

means including a gas lift pump for conveying refrigerant liquid from said condenser to said evaporator, and means for introducing pumping gas intosaid gas lift pump.

'9. In a refrigerator, a cabinet'structure liaving an insulated food compartment and a mechanism chamber beneath said food compartment and arranged for flow of cooling air therethrough, an

means includinga gas lift pumpfor conveying evaporator, and means for introducing pumping gas into said gas lift pump, said evaporator being so constructed and arranged that the refrigerant liquid is positively propelled therethrough by the inert gas;

10. In a refrigerator, a cabinet structure having a lower mechanism compartment arranged for circulation of cooling air therethrough and an insulated refrigerating compartment having an evaporator receiving opening in the lower part of a vertical wall thereof above said mechanism compartment, an insulated closure element for said opening, absorption refrigerating apparatus associated with said cabinet structure comprising an evaporator positioned adjacent the lower wall of said refrigerating compartment, an air cooled absorber and a boiler assembly in said mechanism 1 compartment connected, for circulation of absorption solution, an inclined air cooled condenser in said mechanism compartment arranged to receive refrigerant vapor from said boiler assembly and to supply refrigerantliquid to said evaporator, and means providing" for circulation of inert gas between said evaporator and said absorber.

"11. In a refrigerator, a cabinet structure having a lower mechanism compartment, arranged for circulation of cooling'air therethrough and an insulated refrigerating compartment having an evaporator receiving opening in the lower part of a vertical wall thereof above said mechanism compartment, an insulated closure element for said opening, absorption refrigerating apparatus associated with said cabinet structure comprising an evaporator positioned adjacent the lower wall of said refrigerating compartment, an air cooled absorber and a boiler assembly in said mechanism compartment connected for circulation of absorption solution, an inclined air cooled condenser in said mechanism compartment arranged to receive refrigerant vapor from said boiler assembly and to supply refrigerant liquid to said evaporator, and means providing for circulation of inert gas between saidevaporator and said absorber includinga gasheat exchange element positioned in said mechanism compartment. I

12. In a refrigerator, a cabinet structure having a lower mechanism compartment arranged for circulation of cooling air therethrough and an insulated refrigerating compartment having an evaporator receiving opening in the lower part 'of a vertical wall, thereof above said mechanism compartment, aninsulated closure element for said opening, a blower for positively circulating the air in said refrigerating compartment, a drive motor for said blower embedded in the insulation of said closure element, absorption refrigerating apparatus associated with said cabinet structure comprising an evaporator positioned adjacent the lower wall of said refrigerating compartment, an air cooled absorber and aboiler assembly in said mechanism compartment connected for 'circula-' tion of absorption solution, an inclined air cooled condenser in said mechanism compartment arranged to receive refrigerant vapor fromsaid boiler assembly and to supply refrigerant liquid to said evaporator, and means providing for circulation of inert gas between said evaporator and said absorber including a gas heat exchange element positioned in said mechanism compartment.

13. In a refrigerator, a cabinet structure having a lower mechanism compartment arranged for circulation of cooling air therethroughand an insulated refrigerating compartment having an evaporator receivingopening in the lower part. of a vertical wall thereofaabove said: mechanism compartment, .an insulated" closure element. for said opening, af rigid frame structure .positioned in said mechanism compartment, an absorption refrigerating apparatus associated with said cabi.-. net and supported on said frame structure. comprising an air cooled absorberanda :boiler assem: bly mounted on said frame and connected; for circulation of absorption solutionyan air'co'oled condenser supported on said framev andconnected to. receive refrigerant: vapor fromsaid boiler assembl-y, an evaporator. positioned above said frame in said refrigeratingcompartment, means. connecting said evaporator and said absorber for: circulation of inert gastherebetween, and'meansfor conveying refrigerant liquidfromisaid Icon;- dense-r to said evaporatonsaid frame, said refrig-. crating mechanism andv said closure element forming a rigid assembly which iszassembled with said cabinet by sliding-the said rigid assembly into said 'cabinetestructure.

14. In a refrigerator, a cabinet structure havinga lower mechanism compartmentv arranged for circulation ofwcooling. air therethrough and an insulated refrigerating compartment. having an evaporator receiving opening'in the lower part of avertical wall thereof above said mechanism compartment, an insulated 'closure element' for said openingga rigid frame structure positioned in saidmechanism compartment, an absorption refrigerating apparatus associated with saidcabinet and supported on said frame structure com-' prising an air cooled absorber and a boiler assembly mounted on said frame; and connected for circulation of absorptionsolution, an 'aircooled condenser supported on said frame and cnnect+ ed to receive refrigerant vapor from said boiler assembly, an evaporator having a freezing sectionand anrair cooling section positioned rearwardly of said freezing section,said evaporator being positioned abovesaid frame in said refrigerating compartment,. means connecting said evaporator and said absorber for circulation of inert gas therebetween, means for-conveying refrigerant liquid fromsaid condenser to said evaporator, means forming a conduitsystem arranged for: circulation of air fromv said refrigerating compartment over said air coolingevaporator and back to said compartment, a blower for circulating air through said conduit system and a drive motor for said blower embedded in the insulation 0f said closure element, said frame, said refrigerating mechanism and said closure element forming a rigid assembly which is assembled'with' said cabinet by sliding the :said rigid assembly into said cabinet structure. 7

15.. Refrigerating apparatus comprising a cabi= net structure havingan insulated refrigerating chamberand a mechanism compartment entirely underlying said refrigerating chamber, a refrig-' crating mechanism of the three-fluid absorption type associated with said cabinet structure in-- eluding an evaporator-in said chamber, a boiler in said compartment, an air-cooled absorber and an air cooled condenser in said compartment,

and means for positively elevating refrigerantliquid from said'condenser upwardly to said evaporator.

l6. Refrigerating apparatus comprising a cabinet structure having an insulated refrigerating chamber and an underlying mechanism compartment, a refrigerating mechanism. of the three-fluid absorption type associatedwith said cabinet structure including an evaporatorin said chamber, aboiler'insaid compartment, an air cooled absorber and an air cooledcondenser in saidscompartment, a gas'heat exchanger embedded in the insulation .of' the bottom wall of said compartment, and means for positively elevating= refrigerant liquid from said condenser upwardly to said evaporator.

1'7. Refrigerating apparatus comprising a cabinet structure having an. insulated refrigerating chamber and 'anvunderlying mechanism compartment, a: refrigerating mechanism vof the three-fluidabsorption type associated with said cabinet structure including an evaporator in said chamber, 'a boiler in said compartment, an air cooled absorber in said compartment, an air cooled condenser positioned in a recess in a wall ofsaid chamber of such dimensions that no part of'said condenser 'projects'beyond the normal wall limits of said chamber, and means for conveying refrigerant liquid by gravity from said condenser to said'evaporator, said recess being so constructed and arranged that cooling air may flow therethrough acrosssaid condenser and said mechanism compartment being constructed and arranged for circulation of cooling air in contact with said absorber.

18. Refrigerating apparatus comprising. a cabinet structure having an insulated refrigerating chamber and a mechanism compartment below and within the vertical projection of the horizontal dimensions of said refrigerating chamber, a refrigerating mechanism of the three-fluid absorption type associated withsaid cabinet structure including an evaporator in said chamber, a boiler in the bottompart of saidcompartment, a tubular finned multi-passabsorber conduit positioned-in the 'upper front portion'of said compartment and inclined generally downwardly and rearwardlyto provide for gravity flow of solution therethrough, a tubular finned multi-pass condenser conduit positioned inthe upper rear portion of said mechanismzcompartment and inclined-generally downwardly. and rearwardly to provide for gravity now ofrefrigerant liquid to thelower part thereof, and means connecting saidboiler, said'condenser, said evaporator and said absorber for circulation of refrigerant, said cabinetstructure being arranged to provide for flow of-cooling air-into the lower part :of said mechanism compartment. and fordischarge to theysurroundingatmosphere of airheated by said absorber and said condenser.

.19. Refrigerating apparatus comprising a cabinet-structure having an insulated refrigerating chamber and an underlying mechanism compartment, a refrigerating mechanism-of thev threefluid absorption type associated :with said cabinetwstructure including anevaporator in said ch'amben'a boilerin the-bottom part of said compartment,. a .-tubular vfinned multi-pass absorber conduitwpositioned in the upper front portion of saidcompartment and inclined generally downwardlyi and rearwardly to provide for gravity flow of solution therethrough, a tubular finned multipass;condenserconduit positionedin the upper.

' rear portion of 'said mechanism compartment and inclined. generally downwardly' and :rearwardly to provide for-gravity flowof'refrigerant liquid to the lower part thereon-1a power driven gas circulator assembly positioned in said com-.

-lower'partof said mechanism compartment and for discharge to the surrounding atmosphereof air heated by said absorber and said condenser,

. and said gas circulator assembly being positioned said out of thepath of flow of air traversing condenser and saidabsorber.

20. In a refrigerator, structure forming an insulated food'preserving compartment, structure forming a mechanism chamber underlying and supporting said compartment, a three-fluid re.-

frigeratingapparatus associated with said compartment and said chamber Comprising an evaporator insaid compartment, a tubular air cooled absorber in said chamber, a'tubular air cooled condenser, a generator insaid chamber, means providing for circulation of inert gas between said absorber andsaid evaporator including a power driven device for elevating the pressurezof the inert gas to cause the gas to circulate, means pro,- viding for circulation of absorption solutionbetween said generator and said absorber including means operated by inert gas at the elevated pressure for elevating absorption solution between the generator and the absorber, means for conducting refrigerant vapor evolved in said generator to said condenser, and means for conductinrefrigerant liquid from said condenser to said evaporator, said apparatus being characterized by the fact that all portions thereof lie withinthe'horizontal dimensions of said structure forming said compartment andbelow the upper wall thereof.

21. In a refrigerator, structure forming an insulated food preserving compartment, structure forming a mechanism chamber underlying and supporting said compartment, a three-fluid refrigerating apparatus associated with said compartment and said chamber comprising an evaporator in said compartment, a tubular air cooled absorber in said chamber, a tubular air cooled condenser, a generator in said chamber, means for conducting refrigerant vapor from said gene'rator to said condenser, means for conducting refrigerant liquid from said condenser to the low-' er portion of said evaporator, means providin for circulation of inert gas between said absorber and said evaporator including a power driven device for imparting suiiicient pressure and velocity to the inert gas to cause the inert gas to circulate refrigerant liquid upwardly through said evaporator, and means providing for circulation of absorption solutionbetween said generator and said absorber including means operated by inert gas under pressure for elevating absorption solution between the generator and the absorber, said apparatus being characterized by the fact that all portions thereof lie within the horizontal dimensions of said structure forming said compartment and below the upper wall thereof.

22. In a refrigerator, a cabinet structure including an insulated food compartment and a I 23. r In a refrigerator, a cabinet structure including an insulated food compartment and a mechanism chamber arranged-for flow or cooling air therethrough, an absorption refrigerating appa-' ratus associated with said cabinet structure including an evaporator'in the lower part of said compartment, an air cooled absorber andan air cooled condenser in said chamber below-said food compartment, a generator insaid chamber, means providing for circulation of inert gas between said absorber and said evaporator, means providing for circulation of absorption solution between said tween said-absorber and said. evaporator, means providing for. circulation-of absorption solution between said absorber and said generator means for conveying refrigerant vapor from saidgenerator to said condenser, means for conveying refrigerant liquid upwardly from said condenser to I said evaporator, and an air circulator arranged to circulate air in said food compartment over said evaporator.

25. In a refrigerator, a cabinet structure including an insulated food compartmentand a mechanism chamber arranged for flow of cooling air therethrough, an absorption refrigerating apparatus associated with said cabinet structure including an evaporator in :the lower part of said compartment, anaircooled absorberand an air cooled condenser in said chamber below said food compartment, a generator in said chamber, means providing for circulation of inert gas between said absorber and said evaporator, means providing for circulation of absorption solution between said absorber and said generator, means for conveying refrigerant Vapor from said genmechanism chamber arranged for flow ofcooling air therethrough, an absorption refrigerating apparatus associated with said cabinet structure including an evaporator in said compartment, an air cooled absorber and an air-cooled condenser in said chamber below said food compartment, a generator in said chamber, means providing for circulation of inert gas between saidabsorber and said evaporator, nieans providing for circulation of absorption solution between said absorber and said generator, means for conveying refrigerant vapor from said generator to said condenser, and means for conveying refrigerant liquid upwardly from-said condenser to said evaporator.

erator to said condenser, means for conveying refrigerant liquid upwardly from said condenser to said evaporator, an air circulator arranged to circulate air in said food compartment over said evaporator, and electrical means for operating said air circulator arranged out of contact with the air in said food compartment.

26. In a refrigerator, a cabinet structure including an insulated food compartment and a mechanism chamber arranged for flow of cooling air therethrough, an absorption refrigerating apparatus associated with said cabinet structure including an evaporator in said compartment, an

. air cooled absorber in said mechanism chamber,

an air cooled condenser positioned below the upper wall of said cabinet structure and within the vertical projection of the horizontal dimensions of said insulated food compartment, a generator in said chamber, means providing for circulation of inert gas between said absorber and said evaporator, means providing for circulation of absorption solution between said absorber and said generator, means for conveying refrigerant vapor from said generator to said condenser, means for conveying refrigerant liquid from said condenser to said evaporator.

air cooled heat rejecting :element positioned in said base element'underlying said panel, and means connecting said evaporator, said refrigerant vapor producing means and said heatrejecting element in circuit, said base element-being constructed and arranged to support said refrigerating mechanism and said firstmenticned element.

28. In a refrigerator; a cabinet structure comprising an insulated refrigerating chamber and a mechanism chamber underlying said refri'gerating chamber, said mechanismchamber being open at the rear of said cabinet structure for egress of cooling air and at the bottom thereof for entrance of cooling air; an absorption refrigerating mechanism including a condenser, a generator, an absorber and an evaporator; means connecting saidcondenser, generator, absorber and evaporator in circuit; means supporting said generator, absorber and condenser in said mechanism chamberbeneath said refrigerating chamher, said evaporator being positioned in said refrigerating chamber, said absorber comprising a tubular finned conduit arranged in the forward portion of said mechanism chamber, means to lift refrigerant liquid from said condenser to said evaporator, and said condenser comprising a tubular finned conduit positioned in said mechanism chamber rearwardly of said absorber.

29. In a refrigerator; a cabinet structure comprising .an insulated refrigerating chamber and a mechanism chamber underlying said refrigerating chamber, saidmechanism chamber being open at the rear of said cabinet structure for egress of cooling air and at the bottom thereof for entrance of cooling air; an absorption refrigerating mechanism including a condenser, a generator, an absorber and an evaporator, means supporting said generator, absorber and condenser in said mechanism chamber beneath said refrigerating chamber, said evaporator being positioned in said refrigerating chamber above said absorber and said condenser; means connecting said condenser, generator, absorber and evaporator in circuit including means for elevating refrigerant liquid from said condenser to said evaporator; said absorber comprising a tubular finned conduit arranged in the forward portion of said mechanism chamber, said condenser comprising a tubular finned conduit positioned in said mechanism chamber rearwardly of said absorber, and said generator being positioned in said mechanism chamber at the rear portion thereof.

30. In a refrigerator; a cabinet structure including an insulated refrigerating compartment and a mechanism compartment, an absorption refrigerating apparatus associated with said cabinet structure comprising an evaporator in said refrigerating compartment, an air cooled absorber and an air cooled condenser in said mechanism chamber, a generator in said mechanism chamber, means connecting said generator and said absorber for circulation of absorption solution therebetween, means connecting said evaporator and said absorbr for circulation of inert gas therebetween, means for conveying refrigerant vapor from said generator to said condenser, and means for lifting refrigerant liquid upwardly from said condenser to said evaporator, said condenser and said absorber being located adjacent the bottom portion of said cabinet structure.

ARNOLD D. SIEDLE.