US2544916A - Controlled absorber cooler in refrigerator - Google Patents

Description

March 13, 1951 c. c. COONS 2,544,916

CONTROLLED ABSORBER COOLER IN REFRIGERATOR Filed Dec. 26, 1946 E 2 Sheets-Sheet 1 INVENTOR. Curlis 6. Coons March 13,1951 0. c. COONS 2,544,916

CONTROLLED ABSORBER COOLER IN REFRIGERATOR Filed Dec. 26, 1946 2 Sheets-Sheet 2 INVENTOR. Curll's 6. 800116 WAySW ATTORNEY.

Fatenteci Mar. 13, 1951 U NI TED S TAT ES PAT ENT ICE eeNrneLLEn ABSORBER 'COOLEKINI REFRIGERATOR e ns a, Coons, North Garden/01in, ass gntr "6 The Hoover Cbrnpany, North'Cariton; Oh'io', a

obi-parasite of Ohio The presentinvention relates to the art of refrigerating apparatus and more particularly to a new and improved refrigerating apparatus oft-he int'ermittent absorption-type having a cooling system embodying a number of novel features.

It is customary to provide intermittent absorption refrigerating. machines in two units which operate alternately with respect to each other on generating. and: abso'rbingperiods of operation to provide substantially continuous refrigeration. Such systems have an inherent disadvantage in that the cooling jacket of the generator-absorber operating on the absorbing period of operation contain'sa considerable quantity of cooling liquid when it is switched over to generating operation; Such "residual liquid in the cooling jacket must be driven out by vaporization due tothe heat applied to the generator-absorber and thus represents a direct loss in heating effect.

It is a principal object of the present invention to provide a means so constructed and arranged as to pump the residual liquid in the generator-absorber coolingijacket out quickly as soon as heat is applied thereto without vaporizing more than a comparatively insignificant proportion of such residual liquid. By thus pumping out residual liquid, the thermal efiiciency of the ap-' para-tus is directly increased and the generating period of the generator-absorber is decreased-be= cause'it is no longer necessary to remove residual liquid by vaporizing the entire quantity thereot.

It is a further object of the present invention to eliminate the externally operated cooling medium control. valve characteristic of conventional systems and to control the flow of cooling medium in heat exchange with the generator-absorber solely by the external application of heat tothe generator-absorber.

It is a further object of the invention toprovide a dual intermittent absorption refrigerating system so arranged'that heat removed from one generator-absorber at the beginning of its heat;- ing period is utilized to aid the initial heating of an associated generator-absorber beginning a heating period of operation.

These and other objects of the invention will be developed in detail as the description proceeds when taken in connection with the accompanying drawing, in which:

Figure 1 is a diagrammatic representation of an intermittent absorption refrigerating machine embodying the present invention;

Figure 2 is a partial view of a modified'form of the invention; and

Figure 3 is a simila-r'view of another'modifieee tion of the invention,- 1

Referrin now to Figure 1 two substantiauy identical intermittent absorption refrigerantg. machines are-i1lusti ated on the right and left hand' sides of said figure, 're'spe e1y; since the two intermittent atserptidn'reffigeiatmg 'Sy'stfi'is' areidentical',.only the left-hand system Figure I will be described-directly 'aliid the parts dfth' rig-ht -haliicl s stem. will be gii lel l the Same Teference characters as the corresponding" parts in" the left-hand syS tI nL distinguished by a The primary refrigerating system consists 'Q'f a generator-absorhi asse Ifiblyj l', a-coauenser 2- and an; evaporator assembly gener'attr assembly I' communicates with the condenser through a va dr.,pipe fahdl the conaei ser cemmu'iiizates with the evaporator assembly- 3 by a pipe The generator 'censtfuetib'mma he of. any desii'e'cl? type in a'ccbrda'nce with the principles. "of the pis'ent' ifivehtioh. F0i" purposes dfil lutra tion the present invention isappliedto the type of generator-absorber assffibly names a dry sart 'Strbhfiufii chloride" its the 315- 'Sdrbfit. Kiihydrousam dfiifis a ifliefel led 52'5- irigerant but this-iiflififiiiri'isnot li'fiiitd th ifo. Bfififivth' generatfdnabstrterasseiiitry I Elfinprises" ttert'aweter easing 1 and" inner cbhe htiica lly arranged fabTiTet or refine 8" be tii? f). hitters pbsitidhefi -a-plu ialifi OT trays etntammgtreatments mec'iufii'sueh' as: stint 'chlofidefnot'showfi'." tHiifiI tilb e or 0611fd'liit eenan'ge' cohe bally with the'ja'clifi is secured n 1 fete t'o forlni a coolihg'jaicket T0 'tlfeiebetweeii'; The central heating tube 9' rants products of cohlbusfib'fi flue refine f-li el'b" Her I] Wfiifih discharges its l i'bdllift s 0f c fiii lbil sti ii thereinto. The evaporatnr assembly? any be of any desireut p'e; H'Owelil, for purposes of'ill l l stiatibh hereirithe e aperator assembiy is shown as or theitvige disclo'sed' ifi' United "states Letter Patent 2,386,438; I

The toolin acket tumor-med By. the space betw en the concentrically positioned cylinders '8 and 9 eqimhunicatesatits upper end with a con.- d nser 1 5 through aconduit [6. The condenser Hiuisenar'eesi fitb all'qu idreceiver I] from which the condensed cooling.v med-minis conveyed to};

"control valve casing 1 8;- throug-hl a conduit l9.

The valve casing}? encloses a controlvalveele ment -Z 0 which; directs the. cooling mediuminto conduits g4 01'- ;2;lcommunicate with the lower ends of the cool-ingjackets: ill and 104, respectively. 4 V l The lower end of the cooling .j acketl ll also communicates with a vapor liftipu-mp fi extende ing upwardly through the products of combustion flue 9 and opens into an enlarged substantially horizontal conduit 24 which discharges into the receiver IT. The large air cooled conduits 24 and 24 promote condensation of vapor therein contained. The vertical portion of pump 23 is heated by the burner H simultaneously with the generator-absorber l. The above described cooling system may be charged with any desired cooling medium; methyl chloride is an example of one suitable substance for this purpose.

Fuel is supplied to the apparatus through a gas supply conduit 25 which connects to the solenoid valves 26 and 26 which control the supply of fuel to the burners II and ll, respectively, through conduits 2'! and 21, respectively. A constant flame pilot or ignition burner and pilot flame failure fuel shut off device 28 is mounted to receive fuel from conduit 25 at the point at which that conduit branches to supply fuel to the solenoid valves 26 and 26'. The structure 28 is a known type ignition flame and safety cut-off device which blocks all fuel supply to the unit if the pilot flame is extinguished. Flash tube igniters l2 and I2 extend from the pilot flame to a point adjacent to the burners II and II respectively. When fuel is supplied to either burner a portion of the escaping fuel travels thru the associated flash tube to the pilot and is ignited, the resulting flame propagates back thru the flash tube and ignites the burner.

A bulb and bellows thermostatic device 29 is responsive to the temperature of the external jacket I of the generator assembly I. The expansible bellows is positioned to engage the actuating arm 30 of the control mechanism which actuates the valve 23. The control arm 30 is also positioned to actuate a double pole electrical switch 3|. In the position shown, the switch 3! energizes the solenoid valve 26 to supply fuel to the burner H. The valve 26 is energized from line wire 32, control switch 33, line wire 34.

switch 3 l, wire 35, and line wire 36.

with a snap-acting valve 38 which is linked to a thermostatic bellows 39 along with the electrical switch 33. The arrangement is such that expansion of the bellows 39 indicating a demand for refrigeration causes switch 33 to close the circuit between line wires 32 and 34 and valve 38 to open to allow cooling medium to flow from reservoir ll to control valve chamber 3. This control mechanism is more fully described and illustrated in United States Letters Patent 2,410,- 334 issued October 29, 1946.

Assuming a demand for refrigeration the valve 38 will be open and the switch 33 closed. Immediately after the actuating arm 30 has been moved to the left by expansion of the thermostatic structure 29 and valve 20 has closed conduit 2 lthe condition illustrated-cooling medium flows from chamber l8 through conduit 2| into jacket 16. Switch 3| has also energized solenoid valve 28 to provide a full supply of gas to burner H. Burner H is shown immediately after full energization thereof, that is, discharging products of combustion through the combustion flue 9 and incontact with the pump conduit 23. At this time the jacket 10 contains a considerable quantity of liquid cooling medium at a temperature approaching that of the atmosphere. Unless removed from the jacket [0, such residual liquid will be entirely vaporized by the heat supplied from burner I l, resulting'in anappreciable waste of thermal energy. e i

In accordance with the present invention, the heat of the flame on burner I l vaporizes a small portion of the liquid in conduit 23. Such vapor lightens the liquid column in conduit 23 and produces a vapor lift pump action which pumps the liquid and such vapor as is formed through conduit 23 into the enlarged conduit 24. The vapor and liquid separate in conduit 24 and both then flow into the vessel l1. Residual liquid in jacket i0 is quickly pumped into the receiver I! and can then participate in the process of cooling the generator-absorber structure I.

The apparatus continues to operate in the usual manner, that is, the heat applied to the generator-absorber assembly I drives refrigerant vapor from the absorbent, which vapor traverses conduit 4, is liquefied in condenser 2, and collects in the left-hand evaporator assembly 3. At the same time, cooling liquid flows from reservoir ll into the cooling jacket l0 wherein the same is vaporized and cools the absorbent in the generator-absorber I. The cooling medium vapor then flows from jacket l9 through conduit I6 into condenser l5 wherein it is reduced to the liquid state and returns to the reservoir I! for recirculation through the jacket l0. Any vapor which passes into condenser IE will be condensed therein and the condensate will flow into reservoir H.

The cooling medium serves to reduce the temperature of the absorbent in the generator-absorber I very quickly with the result that the pressure in the primary system is rapidly lowered which induces evaporation of the liquid refrigerant contained in evaporator 3' to produce a useful refrigerating eifect. The vapor produced in evaporator 3 returns through conduit 5, condenser 2, conduit 4', to the generator-absorber assembly I, wherein it is reabsorbed.

When the temperature of the generator-absorber 1 reaches a preselected elevated value, the bellows 29 will expand from the position shown and actuate the arm 30 to its operative position. Such operation will shift valve 23 to discontinue supply of cooling medium to the cooling jacket I0 and to allow the supply of cooling medium to the jacket 10. Additionally, the switch 3| will be actuated to de-energize the solenoid valve 26 and to energize solenoid valve 26; this extinguishes burner H and supplies fuel to the burner II which ignites from the pilot structure 28. The bellows 29' will be collapsed, that is, in the condition shown for bellows 23, long prior to the time at which the bellows 29 is expanded by the attainment of a predetermined high temperature in the generator-absorber I and will not interfere with movement of arm 38 by bellows 29. Upon such switchover the cooling jacket [9' is then emptied of residual liquid in the manner above described for the cooling jacket I0.

Whenever the control switches a generatorabsorber from heating to cooling operation, a considerable quantity of cooling medium flows into the very hot (approximately 300 F.) cooling jacket of the previously heated generator-absorber. High temperature vapor in large quantitles is immediately produced. The resulting rush of vapor will overtax the condensers l5 and IS with the result that vapor will condense in the cooling jacket of the generator-absorber just starting a heating period of operation and aid in the initial heating of the cold generator-absorber. This condensate is then pumped by pump 23 or 23' into reservoir H. The above mentioned coneel-gas densation "in the cooling jacket increases the thermal eificiefncy of the system bytr'ansferring heat from the hot 'generatorgab'sorber starting av cooling period to the cold generator-absorber starting a heating eriod.

A modified form of the invention is illustrated in. Figure 2'. Since the primary system of" this form, ofthe invention is identical with that illustrated in connection with Figure 1', illustration thereof is omitted from Figure '2. The control mechanism for the Figure 2 form of the invention is also identical with the control mechanism of the. Figure 1 form of the invention except that; as will hereinafter appear, it -will not contain valve meansior regulating the flow of the secondary' cooling medium. The control mechanism is, also omitted from Figure 2 for clarity in ilflus tration. Since the m'a'jorportionof theinventi'on in Figure 2 is identical with that heretofore described in connection with Figure 1, identical parts are given the same reference characters.

In the Figure 2 form of the invention, referring first to the left-hand generator-absorber I, the cooling jacket H! is connected with a condenser [51 by a conduit It. The condenser discharges through a conduit to into a cooling medium reservoir 41. The cooling medium reservoir is internally'di'vided along its bottom wall by a partition, 41 into rightand left-hand chambers and is jacketed with insulating material 42. The leftand right-hand sides of' the reservoir 4| drain into thebo'ttom portions of jacket l and 10, respectively, by means of conduits 43' and 43, respectively. In this form of the invention a vapor lift pump, 45-generally corresponding to vapor lift. pump 23 of Figure 1--communicates with thecondui-t. 48 at a low point thereof and closely adjacent its point. of connection with jacket. Ill; Vapor lift pump45 extends upwardly through the heating flue 9' so as to be heated by products of combustion discharged from the burner II and discharges into an enlarged conduit 44' which empties into the reservoir 41 on the-left-hand side of partition 41. Similarly the vapor lift pump 45 extends through flue. 9 and discharges into an enlarged conduit 4-6 which empties into the reservoir 4| on the. right-hand side of. partition 41-.

A tilt bucket structure 48 is tiltably mounted on the upper edge of the dividing partition wall .1-; This, structure is provided withv leftand righthand bucket chambers 49 and 50, respectiu'ely; arranged to: discharge into conduits 43- ands-3,, respectively, when properly tilted, A directing trough :2? is rigidly mounted upon the upper end of the tilt bucket structure as directly beneath the open end of conduit '40;

The arrangement is such that liquid discharging from conduit 4!} in the position shown, for example, flows across the directing plate 52 and discharges into conduit 43 to flow into the cooling jacket of'the generator-absorber i.

The apparatus as illustrated is in the condition Liquid discharged" intotilt bucket 4 t wiil quickly over=balancethetilt bucket structure, causi z-ig i'tto tip to a position opposite-to-that shown, at which time *l'iquidin the bueketchamber cc, liquid discharging through vapor lift pump 4-5; and liquid discharging: through conduit 4t will all flowin-to conduit 43' and-thenc'eto thegener-atorabsorber" l" which has just completed a-heatin-g period of'operation; 1

The sudden discharge of a considerable quantity of cold liquidy'cooling medium into jacket lit ofgenerator -absorb'er I will produce a rushof vapor; Vapor will condense in the still cold'co'olingj'acket H) or the generator I. Asdescribed abovein connection with the Figure 1 formof the invention-and, as before; vapor condensed-in jacket 'lll'wili immediatelybe pumped back into the reservoir: Li'quid condensed in condensers ['5' and I 5"wil lj however, flow through conduit "and'will "return to the-cooling jacket l B".

After" initial stabilization of conditions in the system and emptying of jacket lit of cooling medium, there will be no further discharge through vapor lift pump and condensate formed in the secondary condenser system will flow back into the jacket #0 tocontinue cooling the generator-absorber assembly I When the control mechanism file-energizes burner H and re-energizes burner l l-', the reverse of" theforegoing steps in the operation of the apparatus will then occur.

In this form of the invention the controlne'e'd act only'on the energy-supply or fuel supply for theheating means for the generator-absorbers.

The cooling medium is directed to the desired third modification of the invention. Since the primary system of' Figure 3 is identical with that of Figure 1, only the generator assembly has been shown. Likewise the control for the fuel burners is also identical with that of Fi ure '1 and has also been omitted in Figure 3 for clarity, though the Figure 3 construction, like that of Figure 2, does not include a valve mechanism for controlling the flow of cooling medium to the The vapor lift pump conduits 23 and 23' for removing residual liquid from jackets it and it, respectively,.discharge into enlarged vapor and liquid separating chambers 6-2 and 65, respecl tively, which empty into reservoir chambers BI and 64, respectively. The enlarged conduits 82 and 65 are exposed to cooling air and aid in condensing vapors therein contained. Liquid discharged into chamber til is drained therefrom into the upper portion of jacket H) by a conduit 63 which contains a U-shaped liquid sealing trap. Similarly, conduit 23' discharges into a vessel 64, which communicates with the cooling jacket 10 through a conduit 66 containing a U-shaped liquid trap. The vessels 5! and E i are formed in a single container having a dividing partition therein. Vessels 6i and Ed communicate with each other through the opening 81 in the partition above the highest liquid level attained in these vessels. These vessels are preferably arranged to be air cooled to aid in condensing pumping vapor discharging thereinto.

The operation of the form of the invention of Figure 3 is as follows: Assuming that heat has just been applied to the generator l by energizing burner ll, liquid in conduit 23 will be partialy vaporized and will start to pump liquid from jacket iii through pump 23, and conduit 62 into vessel 6i. Liquid thus discharged into the vessel 6i will flow through conduit 63 into the jacket 16. The generator-absorber assembly I has just completed a heating period of operation and is at a very high temperature. Liquid flowing into jacket I is immediately vaporized and a high pressure is created throughout the cooling system associated with the generator-absorber i. his high pressure is also applied to the cooling system of the generator-absorber i through conduit 63,

vessel 6i, opening 87, and conduit 68. This action empties the trap in conduit 65 and will, momentarily, stall operation of the vapor lift pump 23. The high pressure will also push liquid in jacket l0 up into conduits it and 6B in the direction of condenser until pressure equalization occurs.

Shortly after this equalization of pressure, the pump 23 will again go into operation and will continue to pump liquid from jacket ll! into jacket ill. Pumping vapor is partly condensed in conduit 62 and pumping vapor reaching chambar 5! is condensed in chambers El and 54, and in conduit 55. Vapor condensing in chamber GI and conduit 62 flows into the cooling jacket id but vapor condensing in chamber 64 and conduit 65 will first refill the trap in conduit 66 to replace liquid forced into cooling jacket l 51 when initial high pressure conditions were produced by the initial supply of cooling medium to the hot jacket iii. Any condensate returning to jacket Ii is repumped into chamber 6!.

After the initial unstable conditions are restored by pressure equalization, the jacket ill will be sealed from the cooling system of generator-absorber l by the deep trap in conduit 63: that is, vapor formed in cooling jacket 19' will flow through conduit it into condenser is. and condensate formed therein will return to jacket It, thus achieving-isolation of the two cooling systems. This isolation is not defeated by the vapor lift pump 23' because the pump is in the central flue of the generator-absorber l and will be at a lower temperature than that prevailing in jacket i0 and hence liquid in the pump will not tend to vaporize.

The basic factor preventing transference of vapor between the two cooling systems in addition to the trap in conduit 33 is the fact that the two condensers are in heat exchange relation. Vessels 5i and 64 will be at substant'ally the same temperature. The parts of the cooling system of the generator-absorber I which are closely asset ciated with the generator itself, will be at a temperature far above the condensing temperature. for the pressure prevailing in the cooling system Hence there will be no of generator-absorber l. tendency for vapor to travel from conduit 23 and condense in these portions of the cooling system. Additionally, the condensers l5 and IE will very quickly reach substantially the same temperature; hence there will be no tendency for vapor to travel through the cooled conduit 65, vessel 8 t, conduit 56, jacket i9, into the condenser I5 to condense therein. Consequently, after an initial slight exchange of vapor between the systems, further vapor exchange will cease and the systems will be effectively isolated from each other.

Under the above conditions, the condenser l5 may actually exist at a somewhat lower temperature than condenser 15' without inducing a flow of vapor thereinto from the cooling system of the generator-absorber i. This results from the fact that the liquid in conduit 23' and in conduit 63 or vessel 6| is stagnant and air-cooled, and hence will be at a temperature somewhat below the temperature prevailing in the condenser 15. In short, the system quickly stabilizes itself to a point at which all the liquid in the cooling system is in that part of the system specifically associated with generator-absorber I, and all liquid surfaces open to that part of the cooling system specifically associated with the generator-absorber i are stagnant, air-cooled, and at a tempera-j ture below that of condenser 15'. f

It is characteristic of all forms of the invention that liquid is quickly pumped from the generator-absorber which has just completed an absorbing period when heat is applied thereto and that the liquid so pumped out of the heated generator-absorber flows directly into the generatorab:orber which has just completed a heating period.

In addition to the above, the forms of the invention illustrated in Figures 2 and 3 shift the cooling action from one system to the other without the intervention of externally actuated parts so that the control mechanism is required to act directly solely upon the energy source for the generator-absorbers. This results in a material saving of parts and simplification of operation of the system.

It is also characteristic of all forms of the invention that heat is transferred from the hot generator-absorber which has just completed a heating period of operation to the cold generatorabsorber which has just completed a cooling pe-: riod of operation by vapor passing from the hot generator-absorber and condensing in the cool generator-absorber.

Though the means specifically disclosed herein for emptying the generator-absorber cooling jackets consists of a heat operated pump of the vapor lift type other types of pumping means for accomplishing this purpose are within the scope of my invention. For example electric motor driven pump in which the electric motor receives its energy from a thermo-pile heated by the generator-absorber heater or electric motor driven pumps in which the electric motors are connected in parallel with the solenoid valves for the associated generator-absorber heater to be .asegam '9 but various changes may be made in the construction, design and arrangement of parts without departing from the spirit of the invention or the scope of the appended claims.

I claim:

.1. In a refrigerating apparatus a generatorabsorber, a cooling system for said generatorabsorber having a heat absorbing part in heat exchange relation with said generator-absorber and a heat rejecting part, means connecting said heat rejecting and heat absorbing parts for circulation of cooling fluid therebetween, a vapor lift pump connected to receive cooling liquid from said heat absorbing part and to pump cooling medium from said heat absorbing. part'to another part of said cooling system, means for heating said generator-absorber and said pump, and means for simultaneously energizing said heating means and for prevrnting how of cooling medium from said another part of said cooling system into said heat absorbing part.

2. In a refrigerating apparatus a pair of generator-absorbers, means for applying heat 'to each of said generator-absorbers, a cooling system having heat absorbing means in heat exchange relation with each of said generatorabsorbers, heat rejecting means, means providing paths of flow for cooling medium including said heat absorbing means and said heat rejecting means for each of said generator-absorbers, means associated with said cooling system for pumping liquid cooling medium from the heat absorbing means in. heat exchange with the generator-absorber being heated "into the path of flow of cooling medium fiowing'to the heat absorbing means in heat exchange relation with the unheated generator-absorber, and means controlling the operation of said heating means and said pumping means for heating said generator-absorbers alternately and for pumping cooling medium out of the heat absorbing means in heat exchange relation with the heated. generator-absorbtr.

3. In an absorption refrigerating apparatus of the intermittent type, Ia generator absorber,

means associated with said generator-absorber for passing a coolant in heat exchange relation therewith, heat rejecting. means connected to receive warm coolant from said coolant passing means, means for conveying coolant from said heat rejecting means, to said coolant passng means, means for interrupting the flow of. coolant to said passing means when. heat is applied to said generator-absorber, means for intermittently heating said generator-absorber, heat operated pumping means connectedto receive coolant from said passing. means and to dscharge ,coolantto aportion of the apparatus from which :sorbers, heat rejecting means. arranged to receive warm coolant from. said heat absorbing parts,

means for conducting, cooled coolant from said heat rejecting means to said heat absorbing means including means. to direct such cooled coolant to, the heat. absorbing part associated with. the. generator absorber not being heated by said heating. means,v heat. operated pumping means associated with each generator-absorber positioned to be heated. simultaneously with said generator-absorber and connected to pump coolant from said heat absorbing parts to a part of the apparatus from which such coolant can flow to said heat absorbing parts only through said directing means.

5. In" an absorption refrigerating apparatus a pair of generator-absorbers, heating means for heating said generator-absorbers alternately, a cooling system. having heat absorbing parts in heat exchange relation with said generatorabsorbers, heat rejecting means arranged to receive warm coolant from said heat absorbing parts, a reservoir connected to receive coolant from said heat rejecting means, conduits for conducting coolant from said reservoir to each of said heat absorbing parts,.movable means in said reservoir for directing coolant from said heat rejecting means into the conduit leading to a selected one of saidv heat absorbing parts, a heat operated pumping means associated with each of said generator-absorbers and each arranged to be heated when heat is applied to the associated generator-absorber, fluid operated means in said reservoir for operating saidmovable m: ans, each of said heat operated. pumps discharging into said reservoir to operate said fluid operated means and to discharge fluid pumped from one heat absorbing part into the conduit leading to the other heat absorbingpart.

6. 'In an. .absorption refrigerating apparatus a pair of generator-absorbers, heatingmeans for heating said gt'nerator-absorbers alternately, a

cooling system having. heat absorbing parts in heat exchange relation with said generator-ab- 'sorbers, heat rejecting means arranged to receive warm coolant from said heat absorbing parts, a reservoir connected to receive coolant from said heat rejecting means, conduits for conducting coolant from said reservoir to each of said heat absorbing parts, atiltable structure in said reservoir having two liquid receiving pockets each arrangid to overbalance said structure and to discharge liquid therein when a predetermined quantity of liquid has been collected in the pocket,, said conduits being connected to said reservo r in such manner that each conduit receives liquid from one of said pockets, a diversion element arranged to be opzrated by said tiltable structure to direct coolant entering said reservoir into the conduit into which said tiltable structure is positioned to discharge, a vapor lift pump associated with each generator-ab sorber and arranged to be heated therewith, each vapor lift pump being connected to rcmove cooland to return cooled coolant to the heat rejecting part of origin, 'a vapor lift pump associated with each generator-absorber and arranged to be heated therewith, each of said vapor lift pumps connected toreceive coolant from the heat. ab-

' sorbing part in-heat exchange relation with the associated generator-absorber and to discharge 11 r coolant into the heat absorbing part in heat exchange relation with the other generator-absorber.

8. Absorption refrigerating apparatus comprising a pair of generator-absorber assemblies each including an absorbent container, a heat absorbing part for cooling medium in heat exchange relation with said container, a vapor lift pump connected to the lower part of said heat absorbing part and a heating means arranged to heat said pump and said container, a heat rejecting means connected to each of said heat absorbing parts to form a cooling medium circuit individual to each generator-absorber assembly,

each of said vapor lift pumps being connected to d scharge cooling medium from the cooling medium circuit of the associated generator-absorb er into the cooling medium circuit of the other generator-absorber.

9. Absorption refrigerating apparatus comprisinga pair of generator-absorber assemblies each including an absorbent container, a heat absorbing part for cooling medium in heat exchange relation with said container, a vapor lift pump connected to the lower part of said heat absorbing part and a heating means arranged to heat said pump and said container, a heat rejecting means connected to each of said heat absorbing parts to form a cooling medium circuit individual i to each generator-absorber assembly, each of said vapor lift pumps being connected to discharge cooling medium from the cooling medium circuit of the associated generator-absorber into a reservoir, and a connection from said reservoir to the heat absorbing part of the other generatcrabsorber assembly including a liquid sealed trap.

10. In an absorption refrigerating apparatus comprising a pair of intermittent absorption refrigerating systems each including a generatorabsorber, a condenser and an evaporator con densation cooling means in heat exchange relation with its associated generator-absorber into parts of said vaporization-condensation cooling system from which such liquid can flow into heat exchange relation with the other generator-absorber.

11. Refrigerating apparatus comprising a pair of generator-absorbers, heating means, a cooling system including heat absorbing parts in heat transfer relation with each generator absorber and heat rejecting means, pump means connected to receive liquid cooling medium from said heat absorbing parts and to discharge liquid cooling medium received from one heat absorbing part into a part of the cooling system from which the cooling medium can flow into the other heat absorbing part, and control means for actuating said heating means to apply heat alternately to said generator absorbers and to actuate said pumping means to remove liquid cooling medium from the heat absorbing part associated with the heated generator absorber.

l2. Refrigerating apparatus comprising a pair of intermittent refrigerating systems each including a generator-absorber, a cooling means for each generator-absorber, each of Said cooling systems including a heat absorbing part arranged to cool theassociated generator-absorber and a heat rejecting part connected in circuit for circulation of a cooling medium, means associated with each generator-absorber arranged to pump liquid cooling medium from the cooling means of the associated generator-absorber into the cooling system of the other gLnerator-absorber, means for heating said generator-absorbers, and means for activating the heating means and the pumping means for each generatorabsorber alternately with respect to the heating and pumping means for the other generatorabsorbzr to apply heat thereto and to pump cooling medium into the cooling system of the associated generator-absorber.

13. In a, refrigerating system; a pair of intermittent absorption refrigerating apparatuses each comprising a generator absorber, a condenser and an evaporator connected in circuit; means for individually heating said generatorabsorbers; a cooling system for said generatorabsorbers including a plurality of communicating parts, said parts including a heat absorbing part in heat exchange relation with each generator-absorber, a condensing part connected to receive coolant vapor from said heat absorbing parts, coolant liquid directing means for directing the liquid coolant in the system into a selected one of said heat absorbing parts including pump means arranged to withdraw liquid coolant from the part in heat absorbing relation with'each generator-absorber and to pump such withdrawn liquid coolant into a part of the system from which it can flow into the part in heat absorbing relation with the other generatorabsorber, and means for activating the pumping means and the heating means to apply heat to each generator-absorber and to pump coolant from the heat absorber part associated with the heated generator-absorber alternately.

l4. Refrigerating apparatus comprising a pair of intermittent absorption refrigerating apparatuses each including a generator-absorber; means for heating said generator-absorbers alternately, a cooling system for cooling each of said generator-absorbers alternately including a vaporizing part in heat exchange relation with each generator-absorber, a condensing part associated with each vaporizing part arranged to receive coolant vapor therefrom and to return liquid coolant into said vaporizing part, a heat operated pumping means associated with each generator-absorber and arranged to be heated therewith, each pumping means being connected to receive liquid coolant from the cooling system of the associated generator-absorber and to pump liquid coolant into the cooling system of the other generator-absorber.

15. In a refrigerator, a genLrator-absorber, a cooling system for said generator-absorber including a heat absorbing part in heat exchange relation with said generator-absorber, a heat rejecting part, means for conveying heated cooling medium from said heat absorbing part to said heat rejecting part, means for conveying cooling medium from said heat rejecting part to said heat absorbing part including flow control means for allowing or preventing flow of cooling medium into said heat absorbing part, a vapor lift pump connected to receive liquid cooling medium from said heat absorbing part and to discharge cooling medium into a part of the system from which it flows toward said flow control means, and means for simultaneously heating said generator-absorber and said vapor lift pump.

16. Refrigerating apparatus including a pair of generator-absorbers, means for heating said generator-absorbers alternately, a cooling system associated with said generator-absorbers including a pair of heat absorbing parts each of which is in heat exchange with a different one of said generator-absorbers, heat rejecting means arranged to receive cooling medium vapor from said heat absorbing parts and to return liquid cooling medium to said heat absorbing parts, said system including means for directing liquid cooling medium from said heat rejecting means into the heat absorbing part in heat exchange with the generator-absorber which is not being heated, a pair of vapor lift pumps each arranged to receive liquid cooling medium from the heat absorbing part in heat exchange with a different one of said generatorabsorbers and to be heated simultaneously with the generator-absorber in heat exchange with the heat absorbing part from which it receives cooling medium, said vapor lift pumps discharging liquid cooling medium into parts of said system from which it flows to the heat absorbing part in heat exchange with the generatorabsorber which is not being heated.

1'7. Absorption refrigerating apparatus com:

prising a pair of intermittent refrigerating systems each including a generator-absorber, means for heating said generator-absorbers alternately, a cooling system for said generator-absorbers comprising a pair of heat absorbing parts each Ill arranged to cool a distinct one of said generatorabsorbers, heat rejecting means arranged to receive heated cooling medium from said heat absorbing parts, means for conveying cooled cooling medium from said heat rejecting means to said heat absorbing parts into either of said heat absorbing parts, a heat operated pumping means associated with each of said heat absorbing parts and arranged to pump liquid cooling medium from its associated heat absorbing part into said conveying means and to be heated simultaneously with the generator-absorber in heat exchange with its associated heat absorbing part and means in said conveying means operated by liquid discharged by either of said pumping means for directing liquid discharged from said heat rejecting means and said pumping means into the heat absorbing part associated with the non-operating pumping means.

CURTIS C. COONS.

' REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,236,575 Kogel Apr. 1, 1941 2,239,019 Ryden et a1. Apr. 23, 1941 2,410,342 Gross Oct. 29, 1946 FOREIGN PATENTS Number Country Date 493,544 Great Britain Oct. 11, 1938

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