US2386883A - Unit cooler - Google Patents

Description

A. D. AMES UNIT COOLER Filed Oct. 3, 1940 4 Sheets-Sheet l mrvmToR HEM/me 0. fines %L 16, 1945, A. Di. AMES 2,386,883

UNIT COOLER Filed Oct. 5, 1940 4 Sheets-Sheet 2 INVENTOR INVENTOR 9671/02 0. 6 955 av 4&4,

4 Sheets-Sheet 3 A D AM ES UNIT COOLER Get. 16, 1945. D AMES 2,386,883

UNIT COOLER Filed Oct. 5, 1940 4 Sheets-Sheet 4 INVENTOR g #27790? 0. ENE s ATTOENEYS.

Patented Oct. 16, 1945 Arthur D. Ames, Galesbur board, Marine and M Waukegan, 11].,

g, Ill., assignor to Outanul'acturing Company, a corporation of Delaware Application October 3, 1940, Serial No. 359,523

29 Claims.

This invention relates to improvements in unit coolers of the type adapted to be mounted in a window or other opening to absorb heat from the air of a room and to dissipate such heat to the outside air.

One of the primary objects of the present invention is to greatly increase the heat exchange capacity of a device of this character by utilizing for heat exchange purposes the shroud of a circulating fan. More particularly stated, it is proposed by the present invention to greatly increase the eiiicacy of the condenser portion of g the apparatus by passing about the shroud in intimate heat conductive'relation thereto the pip leading from the compressor whereby the hottest refrigerant delivered from the compressor is subjected to a scouring action involved in the circulation of air by the fan into intimate heat absorbing relation to the fan shroud, whereby much of the heat of the refrigerant is delivered to the shroud and thence to the circulated. air before the refrigerant ever reaches the condenser proper. In this connection, it is my furtherpurpose to-so devise the shroud and the circulating pipes for the refrigerant as to provide within the shroud a pan into which condensate from the evaporator portion of the apparatus is delivered to be heated by the hot refrigerant just emerging from the compressor, whereby not only to cool such refrigerant but to facilitate the evaporation of the condensate and its dissipation by the fan.

A further major objective of the invention is the reduction of noise in the operation of a unit cooler of the character described. In this connection, it is a purpose of the invention to provide a novel and improved disposition of the evaporating or cooling radiator with reference to the fan which propels room air thereover, the arrangement being simple, inexpensive and yet of greatly increased efliciency and greatly reduced noise. 8

Other objects of the invention will be apparent from the following disclosure.

In the drawings:

Fig. 1 is a view in perspective showing the external appearance of a unit cooler embodying the invention.

Fig. 2 is a detail view of a mechanism as it appears in plan with the case shown in horizontal section to expose the interior construction and certain portions of the mechanism also shown in section.

Fig. 3 is an enlarged view in perspective of the operating portions of the mechanism with its housing completely removed.

Fig. 4 is a fragmentary detail view in perspective of the condenser section of the mechanism with portions of the shroud broken away to expose the construction.

Fig. 5 is a view partially in plan and partially broken away to horizontal'section showing a modified disposition of the parts.

Fig. 6 is a fragmentary detail view similar to Fig. 5 showing in perspective the condenser portion of the modified opening.

Fig. '7 is a view in perspective diagrammatically illustrating, partially separated, the component parts of a modified embodiment of the invention using a blower as distinguished from a propeller type of fan in a shroud serving as the heat exchange function.

Fig. 8 is a horizontal cross section of the fan illustrated in Fig. 7.

Fig. 9 is a detail view .of the mechanism of a modified and preferred embodiment of the invention as it appears in plan with the case shown in horizontal section, as in Fig. 2.

Fig. 10 is a view partially in side elevation and partially in vertical section showing on a reduced scale the preferred device illustrated in Fig. 9.

Like parts are identified by the same reference characters throughout the several views.

The casing or cabinet 9 illustrated in Figs. 1 and 2 is of a type which is normally placed on a window sill and provided interiorly with an evaporator in over which room air is circulated and a condensing radiator H over which exterior air is circulated.

As shown, both the evaporator radiator l0 and the condenser radiator ll are of the type having closely adjacent fins which would occasion 'considerable noise if fans operated in proximity to themto drive, rather than suck, the air through the radiators.

The top of the casing 9 is shouldered at M to provide an abutment for the lower rail of a window sash. Ordinarily, a partition l5 in which the casing 9 is set fills the remainder of the window opening. Outside of the partition l5 exterior air is admitted to the interior of casing 9 through the side openings l6, which are previously described. compartment Ports motor thereby.

The outside air admitted to the casing through the side openings Hi can escape therefrom only I1 in which a suitable base l8 supl9 and the compressor 20 driven This air reaches an interior through the radiatin condenser [I through which such air is admitted to the fan shroud 22 having a rearwardly directed opening 23 before which fan 25 operates on the extended end of the motor shaft 26.

I have found that a fan, drawing or sucking air through a radiator such as that used for the condenser i i makes far less noise that would be made by the same fan rotating in like proximity to a radiator and driving air therethrough. Thus, despite the fact that the air moved is substantially the same in either instance, the noise level is greatly reduced by placing the fan on the outside of the radiator.

At the same time, the disposition of both heat and condensate Water is greatly enhanced by this position of the fan and the arrangement of the shroud 22 as hereinafter described.

It will be noted from Fig. 4 that the shroud 22 is rectangular in elevation. No effort is made to round the corners. As a result, the rotation of the fan 25 tends to create eddy currents at the corners of the shroud and these eddy currents bring into intimate contact with the metal of the shroud a scouring current of air set in motion by the fan. Such air rapidly removes from the shroud the heat delivered thereto by a refrigerant pipe 21 which passes in one or more coils about the shroud in thermally conductive, bonded relation thereto from compressor 20 to the condensing radiator l I One coil or portion 210 of the pipe 21' which brings hot refrigerant from the compressor lies in the lowermost portion 220 of the shroud 22. Such portion 220 of the shroud is closed to constitute a water retaining trough into which condensate is delivered through a pipe 28 from a pan 29 beneath the evaporator I0. Thus, heat from the hot refrigerant is not only given to the shroud and thence delivered to the air stream, but is also delivered to condensate in the trough portion 220 of the shroud, thus raising the temperature of the condensate to a point where the aforesaid eddy currents created by the rotation of the fan blades in a circular path within a rectangular shroud will readily carry off water in the form of vapor. The fan blades rotate in a path which is below the level of the top margin of the trough portion 220 of the shroud 22 and, consequently, if the water should reach an excessive depth in the trough f portion of the shroud without being evaporated in the aforesaid manner, the water would be struck by the tips of the blades of fan 25 and in this manner atomized by impact and thrown from the apparatus.

The evaporator l and pan 29 are located in a chamber 30 which is separated from chamber I! of the apparatus by a partition within the case 9. Room air, that is to say air from within the wall or partition I5, is admitted to chamber 30 through lateral means 32 which are preferably described as shown. The space in compartment 30 is extremely limited and in order to make efiective use thereof and still to have the circulating fan 35 outside of the evaporating radiator iii, the motor shaft is extended at 260 on through the partition 3| and through the radiator l0 and the radiator I ii is formed to provide twoangularly related portions Illa and lb joined at an apex at or near the vertical plane of the motor shaft extension 266 upon which fan 35 is mounted. As a result, the fan is mounted in the angle between the obliquely disposed radiator sections "la and lllb. The air from one of the lateral inlets 32 is drawn through the evaporator radiator section lilo and the air from the other of the lateral inlets 32 is drawn through section lb. The air from both sections is returned to the room through the opening 36 in the casing, such opening preferably being screened.

Some exchange of air from the room to the out of doors is provided for, if desired, by means of an opening 31 in the side of the casing leading from the interior side of partition to the casing i! from which air normally admitted from the outside of partition 15 is withdrawn by fan 25. The suction of fan 25 keeps compartment il under partial vacuum so that some room air will be drawn out through opening 31 subject to the control of a hinged door or valve 38.

Both of the radiators used for the condenser and the evaporator sections of the device are pref erably of the continuous tube type and provided with fins for assisting in heat exchange. In both instances, the fact that the fan is located on the delivery side of the radiator toward which air circulati'on occurs is of great assistance in reducin the amount of noise occasioned by movement of the fan.

Additional air for'cooling purposes is admitted to compartment H from a point outside of the partition l5 through the bottom openings provided at 39 in the casing 9. From the immediate proximity of one of these bottom openings, a passage 40 leads beneath the motor base it? through partition 3i into compartment 3% to deliver outside fresh air to fan 35 for the replenishment of the room air which may be withdrawn through the opening 31 as above described.

The refrigerant cooled in the pipe 21 of shroud 22 and condensed in the condenser radiator H is delivered through a capillary tube or other controlling means 4| to an accumulator 42 which may lie upon the top of the evaporator radiator ill to receive refrigerant from the top coil iilil thereof. A portion of the capillary tube 4| may be wound or coiled at 43 about the accumulator 82 en route to its point of entry into the evaporator-at the bottom thereof as shown in Fig. 3. From the accumulator 42 a return pipe 44 leads back to the compressor to complete the closed refrigeration circuit.

In the construction shown in Figs. 2 and 4, it will be noted that due to the location of the two fans and on the extended motor shaft and the disposition of the motor at one side of the casing, each of the fans is located off center with respect to its associated radiator. It is frequently advantageous, particularly in the case of the fan 25, to have the fan on center with respect to the shroud 22 in which it operates inasmuch as the eddy currents above referred to and their operation above described are increased by this arrangement. However, in certain designs it may be advantageous to have the fan symmetrically located with respect to its shroud 228 and such an arrangement is shown in Figs. 5 and 6.

For other purposes it may be desired to substitute a fan of the blower type for the propeller type of fan here shown and previously described. In Figs. '7 and 8, I have shown an arrangement in which the blower type impeller or fan is used to circulate the condensing air through a housing or shroud 221. The impeller may be of the Sirocco type, as indicated in Fig. 8, supplied with air through axially arranged admission ports I60. The housing 22l is preferably of volute form having a wall progressively increas ing in radius and delivering the air to a tangential outlet portion 222.

A feature of the device consists of the use of partition vanes at 46 which are preferably parallel and substantially uniformly spaced in the delivery portion 222 and extended about the volute wall of the fan housing 22! in the manner shown in Fig. 8. Within the several partition vanes are pipes which are cast or molded as indicated at and these are connected in series by external fittings 49 to provide for the circulation of refrigerant through the passages in a continuous series supplied by pipe 50 and leading outwardly through pipe -I. In a device of this character, the heat exchange surfaces of the circulation passages are so extended by the vanes 46 that this device need not be supplemented'by a radiator as in the case of the devices shown in Figs. 1 to 6 inclusive.

The embodiment shown in Figs. 9 and 10 is preferred for many purposes because of its simin parallel or series, the series connection being illustrated. From the capillary the refrigerant flows into the evaporator coil I02 and thence through the series connecting pipe 51 into the evaporator coil IOI, from which the return pipe 58 carries the refrigerant back to the compressor to complete the closed circuit.

The bed I8I carries the motor I9, the compressor 20 and the motor I9I in an extremely compact arrangement which makes a maximum amount of space available in therest of the cabinet 90 for air circulation along the lines above tion which is quite distinct from that usually followed.

The casing 90 has a radiating condenser III extending completely across the back of the easing and providing an inlet for cooling air.

The air drawn into the casing through the condensing radiator III is expelled laterally through side openings I6I by means of two fans I and 252 mounted on the ends of the armature shaft of the motor I9. It will be noted that the motor I9, instead of being arranged with its armature shaft disposed longitudinally, in accordance with conventional practice, is set with its armature shaft transverse so that the oppositely pitched fans 25l and 252 will expel air in opposite directions laterally from the housing. Since the fans are completely removed from the vicinity of the radiator III, it will be obvious that there will be no noise resulting from interaction ofthe blades with the fins of the radiator. The fans 25I and 252 are provided with shrouds 223 and 224 about which extend the coils 21I and 212 as above described. While the coils may be connected either in series or in parallel, the series connection, as disclosed, is preferred, coil 212 of shroud 224 being connected directly with the output of the compressor 20 and coil 21I of shroud 223 being connected into the condensing radiator II I.

As previously described, the bottom portion of 224, but separated therefrom by the partition 55.

The evaporators IOI, I02 spanth'e 'lateral'inlets 32I and 322 through which room air is drawn into the chamber '56 wherein a separate motor I9I operates the circulating fan 35I to discharge the cooled room air from the housing 90 through,

the return opening 36I. Beneath the evaporators ml and I02 are pans 2! and 292, respectively,

such pans being connected by pipes 28I, 282 into the respective shrouds 223, 224 which, as above noted, lie directly at the other'side of the partition 55. Any desired arrangement such asthe capillary tube, like that shown at 4| in Fig. 2, may be employed to restrict the fiow from the condenser I II to-the evaporators. The evaporators may be connected to the capillary either described.

Where exchange of air between the room and the exterior atmosphere is desired, it can also be provided for very conveniently due to the novel organization and design of the parts. The exterior dimensions and form of the cabinet are preferably similar to those of the cabinet 9 as shown in Fig. 1. Immediately outside of the shoulder I4 engaged by the window sash is a pair of openings 31I fromwhich elbowed pipes 312 lead into the chamber 56 so that under the suc tion produced in said chamber by the operation of the fan 25I outside air will be drawn into the chamber and there mixed with the recirculated and chilled room air for delivery to the room.

The offset in partition 55 which accommodates the compressor 20, as shown in' Fig. 9, makes it possible to withdraw air from the room by means of fans 25I, 252. The chamber in which-the motor I9 and compressor 20 are located may have an opening 313 leading downwardly directly over the compressor 20 whereby room air may be withdrawn by the fans 25I, 252 and expelled out of doors. I

In each of the several devices herein disclosed, the shroud or housing about the. fan would be desirable in any event as a means of controlling the air set in motion by the mm In each of the constructions herein disclosed, the(utility of these shrouds or housings is increased by the additional function of heat exchange. In the construction shown in Figs. 2 and 5, I have shown the heat exchanging fan shroud or housing used only for heat dissipation, but it will be understood that the same principles might be applied for heat absorption if desired. In the unit coolers, there is a greater advantage in the use of the construction for heat dissipation and for heat absorption. In

the blower fan arrangement disclosed in Figs. 7 and 8. however, it is contemplated that the shroud or housing may be used for heat exchange either for the purpose of dissipation or absorption of heat. In any event, the scouring action of the air currents set in motion by the fan contributes materially to'the heat exchange.

I claim: I

1. In a unit cooler of the character described, the combination with a compressorand a motor having a. shaft operatively connected to the cornpressor for the actuation thereof, of a fan mounted on said motor shaft, a radiator condenser having 11] aperture through which said .motor shaft extends. said fan having blades so pitched as to draw air through said radiator condenser, a shroud, enclosing said fan, said radiator condenser being disposed in the path of air drawn to said fan and said shroud being adapted to constrain the fan to draw ,air through the radiator condenser, and a conduit leading from said compressor to said radiator condenser and having an intermediate portion extending, in a coil about at least a part of the path of rotation of said fan and supported on said shroud in thermally concombination with a compressor and a motor having its shaft extended in both directions from the motor, of operative driving connections from the motor to the compressor, an evaporating radiator having closely spaced fins and through which one end of the extended motor shaft projects, a condenser radiator having closely spaced fins and through which the other end of the extended motor shaft projects, and fans mounted on the ends of the extended motor shafts wholly beyond the respective radiator fins and provided with blades positioned so as to be rotatable in immediate proximity to the radiators and across the edges of the fins thereof and pitched to draw air through the respective radiators.

3. In a device of the character described, the combination with a compressor and a motor having its-shaft extended in both directions from the motor, of operative driving connections from the motor to the compressor, an evaporating radiator through which one end of the extended motor shaft projects, a condenser radiator through which the other end of the extended motor shaft projects, each of said radiators comprising fins, and fans mounted on the ends of the extended motor shafts wholly beyond the respective radiator fins and provided with blades pitched to draw air through the respective radiators, at least one of said fans being provided with a shroud enclosing the fan and contiguous to portions of the'adjacent radiator whereby to constrain the air drawn by the fan to pass through the radiator.

4. A unit cooler of the character described comprising the combination with a compressor, of a motor having a motor shaft in operative connection with the compressor, said shaft bein extended at both ends from the motor, a condenser radiator having an opening through which the shaft extends, a fan mounted on the shaft and provided with blades pitched to draw air through the condenser radiator, a shroud for said fan having a conduit in heat conducted relation to the shroud, said conduit being connected in series between the compressor and the radiator, an evaporator having an aperture through which the other end of the motor shaft extends, a fan mounted on the motor shaft adjacent the evaporate:- and having blades pitched to draw air through the evaporator, operative refrigeration connections from the condenser to the evaporator and from the evaporator to the compressor, and a housing enclosing the condenser and evaporator and the motor and compressor, said housing being provided with a partition dividing it transversely into two compartments, one of which contains the evaporator and the other of which contains the motor, the compressor and the condenser, each of said compartments having outlets aligned with the motor shaft, and lateral inlets behind the evaporator and condenser respectively.

5. In a device of the character described, the

combination with a casing having an evaporator compartment provided with an end outlet and lateral inlet means, of a fan shaft directed toward said outlet, a fan mounted on a shaft and adapted to propel air toward said outlet, and an evaporator heat exchanger having obliquely disposed sections iorming an apex adjacent said shaft within which apex said fan is disposed, the

respective sections extending toward the end of the casing at either side of the fan and between the fan and said inlet means and being provided with means closing them to the casing about the fan, whereby air admitted to the casing through the inlet means is constrained to pass through said sections to the fan.

6. In a device of the character described, the combination with a cabinet having oppositely disposed discharge ports in one of its ends and correspondingly disposed lateral intake ports in the other of its ends, of partition means dividing the cabinet between the end having the discharge ports and the end having the intake ports, a power driven transverse shaft extending between said discharge ports and provided with fans for propelling air from said ports, pans associated with the respective fans, expansion coils placed' before the respective intake ports of said cabinets and immediately adjacent the respective pans, and means for delivering condensate from the respective expansion coils directly to the respective pans.

'7. In a device of the character described, the combination with a cabinet and partition means subdividing-said cabinet into an outer compartment and an inner compartment, a motor driven shaft extending transversely of the outer compartment, said cabinet having ports aligned with said shaft, fans on the ends of said shaft for expelling air through said ports, a condenser radiator across the outer end of said cabinet, the outer end of said cabinet having an opening for receiving air into said outer compartment through said radiator for discharge by said fan, shrouds for said fans, the bottom of each shroud comprising a pan adapted to receive condensate, expansion coils disposed along the sides of said cabinet in the inner compartment, pans beneath said expansion coils respectively communicating with the pan portions of the respective shrouds through said partition, said cabinet having ports with which said expansion coils register to refri erate air admitted to the inner compartment of said cabinet through said last mentioned ports, a power driven fan disposed at the end of said cabinet in the inner compartment and arranged to deliver from said compartment air admitted thereto through said expansion coils, said cabinet having an aperture in its end with which said last mentioned fan is aligned. I

8. A device of the character described comprising a cabinet having opposing side openings adjacent its rear end and also adjacent its front end and also having openings in its rear end and its front end, a motor with a transversely disposed shaft provided with fan means for expelling air laterally from the rear side openings of said cabinet, a condenser radiator in the rear end opening of said cabinet in the path of airadmitted to said cabinet to be expelled therefrom by said fan means, an evaporator coil in said cabinet-adjacent each front side opening thereof in the path of air admitted to said cabinet through said front side openings, fan means for discharging through the front of said cabinet air admitted through the front side openings and refrigerated in passing said evaporator coils, and refrigeration mechanism in said cabinet operatively connecting said radiator and evaporator coil .in closed refrigeration circuit, said cabinet being partitioned between said fans.

9. A device of the characterdescribed comprising the combination with a cabinet provided with an opening in its rear end, an opening in its front end, openings in its opposite sides adjacent its rear end, and openings inits opposite sides adjacent its front end, of a partition subdividing said cabinet into compartments with which the front and rear side openings respectively communicate, said partition having an offset toward the front end whereby to enlarge the compartment at the rear of the partition, a compressor within the partition offset, a motor behind the compressor in operative connection therewith and provided with transversely extended motor shaft having oppositely pitched fans arranged to propel outwardly through the side openings of the cabinet near its rear end air from the rear compartment of said cabinet, shrouds about said fans directing the air to said openings, a condenser radiator disposed transversely of said cabinet in the rear compartment thereof across the opening in the rear end of said cabinet in the path of air admitted to said rear compartment to replace air expelled by said fans, coils in thermally conductive relation to the respective shrouds and in operative connection between the compressor and the condenser, evaporators disposed longitudi-' nally of the cabinet before the lateral openings which are located near the front of the cabinet in the path of air admitted through the front compartment of said cabinet to said openings, refrigerator circuit means operatively connectin said evaporators between said condenser and said compressor, and a motor driven fan mounted in front of the opening in the front end of said cabinet and arranged to expel therefrom air side openings of said cabinet communicating therewith and refrigerated in traversing said evaporator coils.

10. A device of the character described'coimprising the combination with a cabinetprovided with an opening in its rear end, an'opening in its front 'end, openings in'its opposite sides adjacent its rear end, and openings in its opposite sides adjacent its front end, of a partition subdividing said cabinet into compartments with which the front and rear side openings respectively communicate, said partition having an offset toward the front end whereby toenlarge the compartment at the rear of the partition, a compress'or within the partition offset, a motor behind the compressor in operative connection therewith and provided with transversely extended motor shaft havin oppositely pitched fans arranged to propel outwardly through the sid openings of the cabinet near its rear end air from the rear compartment of said cabinet, shrouds about said fans directing the air to said openings, a condenser radiator disposed transversely of said cabinet in the rear compartment thereof across the opening in the rear end of said cabinet in the path of air admitted to said rear compart- "ment to replace air expelled by said fans; coils in thermally conductive relation to the respective shrouds and in operative connection between the compressor and the condenser, evaporators disposed longitudinally of the cabinet before the lateral openings which are located near the front of the cabinet in the path of air admitted through with the lower portions of the contiguous shrouds in the rear compartment of said cabinet.

11. In a device of the. character described, the combination with a cabinet having a high inner portion, a lower outer portion, and an intervening shoulder adapted to be abutted by a window sash or the like, of a partition extending transversely of the cabinet and joined to the sides thereof in the vicinity of said shoulder, said partition having an intermediate portion offset forwardly to- .ward the front of the cabinet whereby to provide a relatively large compartment rearwardly of the partition and a smaller compartment forwardly thereof, refrigerator mechanism including a motor, a compressor and a condenser in the rear compartment of the cabinet, and motor driven fan means for circulating atmospheric air over said condenser and expelling it from said rear compartment, evaporator means in operative closed circuit connection with said refrigerator mechanism and condenser and disposed in the front compartment of said cabinet, fan means for circulating room air over said evaporator means, air inlets to the front compartment comprising elbowed connections from the topof the lower section of said cabinet through said partition into the forward compartment thereof for theadmis- 40 sion of external air into the stream of refrigerated air circulated by said last mentioned fan means,

admitted to said front compartment through the said cabinet having a port in the top surface of its higher section leading into the rear compartment of said cabinet behind the offset portion of said partition through which port room air is adapted to escape through the rear compartment of said cabinet.

12. In a unit cooler of the character described, the combination with a cabinet having inlet and outlet openings, of a motor and compressor means for circulating air comprising a fan positioned directly in front of the outlet opening and operatively connected with said motor and having propeller type blades pitched to blow air directly through said opening, means associated with a cabinet Wall adjacent said opening to provide a substantially square cornered shroud about the path of said fan blades, the corners of said shroud being adapted to establish eddies in the course of blade rotation, a condenser radiator contiguous to said shroud, said shroud andsaid cabinet walls comprising means for directing through said radiator currents established in the operation of said fan, an evaporator, and closed circuit connections between the compressor, the condenser radiator and the evaporator radiator including a conduit from the compressor to the condenser radiator having at least one convolution extending about the path of fan blade movement and in bonded relation to said shroud.

13. The device of claim 12 in which the bottom of the shroud constitutes a pan in which portions of said conduit are immersed, said evaporator being provided with a water collecting pan having a drain connection to the pan at the bottom of radiator has a collecting pan at substantially,

the same level, together with a tube connecting tom of the shroud through said partition for the delivery of condensate from the evaporator radiator to the shroudpan, said conduit having at least two convolutions extending across the bottom of said shroud pan, one of said convolutions being located adjacent the cabinet wall through whichair is discharged from the fan and the other being located behind the path of the fan blades from said wall.

15. Air conditioning apparatus comprising an evaporator, a condenser. a compressor, means for passing air to be conditioned thereby across the evaporator, a conduit for delivering the compressed refrigerant gas from the compressor to the condenser, means for collecting moisture condensed on the evaporator, a conduit for conducting the collected condensate from said collecting means, a shroud made of heat conducting material and having a portion formed to receive said condensate fromthe second mentioned conduit and hold the condensate in the form of a pool, and a fan having blades within the shroud arranged to dip into the pool and throw a spray of condensate against the walls of said shroud;

a portion of the first mentioned conduit being arranged to surround the fan blades, said surrounding portion being bonded to the wall structure of the shroud to transfer heat from the compressed refrigerant to the walls of said shroud.

16. A device of the character described comprising the combination with a cabinet having openings at its respective ends and oppositely disposed pairs of openings in its sides adjacent its respective ends, of a condenser radiator extending across one of the end openings of the cabinet, evaporator radiators extending across the side openings of the cabinet adjacent its opposite end, a partition across the cabinet between its respective pairs of lateral openings, fan shaft means disposed transversely of the cabinet adjacent the condenser radiator, fan means on the fan shaft means pitched oppositely to discharge air through the lateral openings adjacent the condenser radiator whereby to draw air through said condenser radiator, fan shaft means disposed longitudinaliy of the cabinet between the evaporator radiators, and fan means on the last mentioned fan shaft means pitched to discharge air through the cabinet opening at the end opposite the condenser radiator whereby to draw air into the cabinet through the respectiveevaporator radiators.

17. The device of claim 16 in which each of the fan means on the transverse fan shaft means is provided with an independent shroud, said condenser radiator having a refrigerant supply pipe leading thereto and bonded in sequence to the respective shrouds.

18. The device of claim 16 in which the respective evaporator radiators are provided with independent collecting pans for condensate, such pans lying immediately shrouds and respectively communicating therewith for the delivery of condensate individually said last mentioned pan with the pan at the botadjacent the respective from the respective evaporator radiator pans to the respective shrouds.

19. A device of the character described comprising a cabinet adapted to rest on a window sill with an inner end within a building structure and an outer end disposed externally thereof, said cabinet having a sash engageable portion and being provided with a large opening at its outer end, and a pair of lateral openings disposed toward its outer end from its sash engageable portion and with another pair of lateral openings disposed toward its inner end from its sash engageable portion, and an air discharge opening at its inner end, in combination with a condenser radiator in the outer end opening of the cabinet disposed transversely of the cabinet, shrouds in front of each of the lateral openings first mentioned, fans disposed in the respective shrouds and pitched to expel air through said first mentioned lateral openings, a motor provided with a common armature shaft mounting said fans whereby the fans expel air from the shrouds and the interior of the cabinet through the first mentioned lateral openings and draw air into the cabinet through the condenser radiator,,a partition extending across the cabinet between the shrouds and the second mentioned pair of lateral openings, evaporator radiators before the openings of the second mentioned pair, and a power driven fan disposed between the evaporator radiators and pitched to expelair from the cabinet through the inner end opening'of the cabinet and to draw air into the cabinet through the evaporator radiators.

20. In a room cooler, the combination with a cabinet having openings substantially aligned at corresponding sides of its opposite ends, of a motor in the cabinet having an armature shaft projecting oppositely toward the respective openings, a compressor beside the motor and operatively connected to receive motion from the shaft, fans mounted on oppositely projecting end portions of the shaft and before the respective openings and pitched to expel air through the respective openings, a partition extending transversely of the-cabinet adjacent the motor and compressor and through which said'shaft extends to one of said fans, and condenser and evaporator radiators in operative refrigeration circuit connection with the compressor and disposed behind the respective fans and provided with means defining an air path through the radiators and about said fans, said cabinet having lateral inlet means for admitting air to traverse said radiators to replace that expelled by said fans.

21. The device of claim 20 in which one of said radiators is disposed between said partition and the fan nearest thereto and comprises two sections in the form of a V with its apex toward the partition and the fan being enclosed between said sections and the end of the cabinet.

22. The device of claim 20 in which the means 7 condenser radiator thermally exposed to reject heat to condensate in the trough beneath. the condenser radiator.

24. A room cooler comprising a cabinet adapted for use across the sill of a building opening, with exposed inner and outer ends, a motor in one of said ends with a transverse shaft, a compressor in the cabinet disposed toward the other end and operatively connected to be driven from the motor, fans on opposite ends of the motor shaft and oppositely pitched, the cabinet having lateral ports to which the fans are directed, a radiator extending across the end of the cabinet adjacent the motor, said end having an opening for admitting air through the radiator, a second motor at the other end of the cabinet with an outwardly directed shaft, a third fan on said second motor shaft and pitched to expel air at said other cabinet end, said other end being open at said fan, a partition having a transverse portion be-.

tween the compressor and the third fan and other portions ofiset toward the center of the cabinet, a pair of radiators disposed at the sides of the cabinet between the offset partition portions and the said other cabinet end, the cabinet having ports for admitting air through the respective radiators comprising said pair, and refrigeration circuit means operatively connecting said compressor and the respective radiators.

25. The device of claim 24 in further combination with shroud means about the fans first mentioned and disposed adjacent the said ofiset partition portions, condensate collection means. beneath the respective radiators comprising the pair, and means affording communication through the shroud means at each side of the cabinet, said refrigeration circuit means including hot line connections from the compressor to the first mentioned radiator in heat rejecting relation to condensate in said shroud means.

27. The device of claim 24 in which the cabinet has a top provided near its center with a transversely extending shoulder.

28. Air conditioning apparatus comprising the unitary combination of a compressor, condenser means, evaporator means, circulating means for air to be cooled, means for guiding such air in operative heat exchange relation to the evaporator means, means for collecting condensate at the evaporator means, circulating means for cooling air for the condenser means, means for guiding the cooling air in operative heat exchange relation to the condenser means, said last means including shroud means extending at lgst partially about the circulating meansfor such Ecoling air and formed to hold condensate for ejection by the circulating means last mentioned, means for delivering condensate from the collecting means to the shroud means, and operative refrigeration circuit connections between the compressor, condenser means and evaporator means and including a conduit for hot refrigerant leading from the compressor to the condenser circulation, the shroud means comprising two said partition: portions between the respective condensate collection means and the respective shrouds having discharge openings adjacent respective apertures of the cabinet and the evaporator means comprising tworadiators adjacent respective shrouds and having individual condensate collecting means opening to the respective shrouds, the first air circulating means comprising fans in the respective-shrouds and an intervening motor in said cabinet having a drive shaft on opposite ends of which said fans are mounted.

ARTHUR D. AMES.

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