CA1316359C

CA1316359C - High security and efficiency refrigerated cooler, and door therefor

Info

Publication number: CA1316359C
Application number: CA000503653A
Authority: CA
Inventors: Russell J. W. Sherlock
Original assignee: CORNELIUS MANUFACTURING COMPANY, LIMITED
Current assignee: CORNELIUS MANUFACTURING COMPANY Ltd
Priority date: 1986-03-10
Filing date: 1986-03-10
Publication date: 1993-04-20
Anticipated expiration: 2010-04-20

Abstract

ABSTRACT OF THE DISCLOSURE

A new and improved cooler of the type typically having glass display doors and being for self-serve has an improved top mounted refrigeration chassis, an improved structure for providing air flow to the condenser, an improved structure for cooling an evaporator fan motor; and new methods of providing ambient air to the condenser and of cooling the evaporator fan motor are provided.
The cooler has a top mounted condenser with a rear cover, rear shield and a U-shaped ambient air flow passageway around the refrigeration low side and through the high side with diverters to turn the air flow into and out of the high side; this structure is particularly useful outdoors, under low ceilings or against a wall.
The cooler has an evaporator fan motor mounted outside of the cold chamber and a passageway from a high pressure zone in the cold chamber to the fan motor so that cold air is propelled to the motor to keep it cool. A method of bringing in and discharging ambient air to and from a condenser has drawing of ambient air to the condenser from the rear of the cooler, propelling the air transversely through the condenser, and exhausting the flow rearward to form a U-shaped flow around and spaced from the evaporator; a method of cooling the evaporator fan has the steps of propelling cold air from the cooling chamber to the fan motor which is outside of the cooling chamber.

Description

-` 1 31 635q BAC~G OUND OF THE INvENlrIoM

FIELD OF_THE INVENTION

This invention in its preferred embodiment pertains to a refrigerated cooler having a relatively high efficiency inle-t and outlet and air path -Eor ambient air for the refrigaration system high side, and to a refriger-ated cooler having high efficiency cooling of an evaporator fan motor, and to a refrigeration chassis having an improved structure for directing flow o~ ambient air past the high side, and to a refrigeration chassis having structure for cooling an exterior evapurator fan motor, and to a method of cooling with a U-shaped ambient air flow, and to a method of cooling an evaporator ~an motor~

THE PRIO~ ART

Glass door re~rigerator coolers are well known to consumers and retailers alike. These coolers are typically found in grocery stores, service stations, ~lorist shops, and similar retailers. The goods sold from these coolers are mostly beverages and perishables, including soft drinks, juices, beer, milk, dairy products, ice cubes, frozen foods, fish bait, fl~wers and the like. These coolers are uaually placed in a help-yourself location where the consumer selects and removes his own goods. The consumer looks through the glass, makes a selection, opens a door, removes the selected produet and the door must then be closed by the customer and/or by an automAtic closing mechanism.
There are sev~ral manufacturers of these coolers, including the Beverage-Aire Division of Gerlock Industries of Erie, Pennsylvania, ~rue Manufacturing Company of St.
Louis, Missouri; H.A. Brown Ltd. o~ Markham, Canada;
~apanese entities such as Sanyo, Fuji, Hitachi, Kawasaki;
and several other entities.

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This type of refrigerated cooler has typically been used inside of a store and the cooler has been protected from the weather and the elements. These coolers come wi~h two types of doors, a first door slides laterally and a second door is hinged on the side and opens outwardly.
The slider door has seal problems because the seals are not tight and they wear out. The hinged door seals better but does not always close reliably. Condensate on the doors and heat loss through unsealed or open doors is a problem.
ModuIar pullout refrigeration is a standard feature on virtually all of these coolers. The condenser and evaporator are built up in a single chassis which typically slides in and out of the cooler frame. There are two divergent lines of thought on where the refrigeration chassis should be. The prevalent school of thought places the refrigeration chassis on the bottom of the cooler and the second school of thought has the chassis on the top of the cooler. Each has good and bad points. The bottom cha~ssis is of lower thermal efficiency because its heat load goes upward on the cold chamber, there is a loss of the lowest shelf from the cold chamber, it is more difficult to force the cold air up in the cold chamber, but it is of lesser manufacturing cost and the refrigeration chassis is easier to install and remove and the ~chassis can be serviced and removed and installed from the front of the cooler.
The top mounted chassis gives a more efficient cooler because the cooled air tends to draft down and the heat load goes up and away from the cold chamber. An extra shelf is available in the bottom of the cold chamber and the chassis is mounted behind a lighted sign atop the unit which makes double usage of the height occupied by the sign. The lighted sign on a top mount chassis cooler is typically :

1 3 1 635~

larger than a bottom chassis cooler. The top mounted chassis is definitely more difficult to remove, service and install because it must be lifted up and lowered down, and has been accessible only from the back of the unit.
However, the top chassis cooler is thought to be the prefer~able cooler for most of the market applications ~ecause of its volumetric, energy, and merchandising efficiency advantages.
One of the problems the top chassis cooler has exhibited is shunting or short cycling of heated and discharged ambient air in the condenser coil or high side of the chassis when the cooler has been installed against a wall and/or under a low ceiling. Either the low ceiling or wall will adversely affect flow of air into and out of the condenser of high side, and the chassis will recycle hot air and the thermal efficiency will decrease a measurable and significant amount.
These coolers typically have an evaporator fan or fans inside of the cooler to circulate air through an evaporator and over the goods on shelves in the cooling chamber. The predominate practice is to place both the fan and its electric motor inside of the cooling chamber. The fan and motor run constantly and the fan motor is cooled by the flow of cold air within the cooling chamber. The objectionable part of this is that the waste heat load of the motor is discharged into the cooling chamber and must be overcome by extended and/or more frequent running of the cooling chassis. This is a serious inefficiency. The problem with putting the fan motor outside the cooling chamber has been that there is no or insufficient air flow to cool the fan motor, fan motors burn out, and there have been significant air leaks where the motor shaft extends through the cooler wall and into the cooling chamber.
Typically the evaporator fan pulls a negative pressure around the shaft because of the centrifugal effect upon air in the fan blades. The negative pressuredraws air in and tends to slightly pressurize the inside of the cooler. While this sounds like a miniscule effect, it is just enough to keep a hinged door from closing, or ~o force a leak through the seal of a door. Again there is a further loss of efficiency and an objectionable characteristic in the cooler.
Glass door coolers have not been successfully placed outdoors for several reasons. The bottom chassis coolers cannot be outside in service stations because of the arcing of contactors near ground level where fuel fumes are. Further, bottom chassis coolers plug themselves up with leaves, paper debris, and tree and plant seeds. The refrigeration chassis of either top or bottom chassied coolers have not been effective for outside service and have been susceptible to the effects of rain, snow, dirt, birds, rodents and the like.
OBJECTS OF TH_ INVENTION
It is an object of the present invention to provide a refrigerated cooler having improved and relatively high efficiency.
It is an object of the present invention to provide a refrigerated cooler that is suitable for use in an outdoor environment and which meets the electrical and safety requirements for outdoor use, and which is relatively waterproof and reliable in an outdoor environment.
It is an object of the present invention to provide an improved refrigerated cooler which has improved efficiency when located against a wall and/or under a low " ,: :

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ceiling.

It is an object of the present invention to provide a refrigerated cooler having increased thermal efficiency and increased reliability and an extended lif~
of its cold air circulation system.
It is an object of the present invenkion to provide an improved re~rigeration system khat improves khe reliability of the doors so that the doors stay closed and do not fog up with condensate, and that has a high thermal efficiency.
It is an object of the preferred embodiment of the present invention to provide a refrigerated cooler that takes the fan motor out of the cold chamber, buk still cools the fan motor for reliability and long life.
It is an object of the preferred embodiment of the invention to provide an improved refrigeration chassis for a cooler, the chassis having an evaporator fan motor removed ~rom the low side o~ the r~frigeration system while having fan motor cooling from the low side.
It is an object of the preferred embodiment of the present invention to provide an improved re~rigeration chassis for a cooler, the chassis having a high side with an improved structure for drawing and exhaustin~ ambient air that enables use of the chassis outside, inside, against a wall, or under a low ceiling.
It is an object of the preferred embodiment of the present invention to provide an improved method of aooling a cooler, having improved drawing and exhausting of ambient air giving high efficiency and usability oukside, inside, and against walls or under a low ceiling.
It is an object of the preferred embodiment of the presen~ invention ko provide an improved method of cooling a cooler, having decreased heat loads in khe cold chamber and cooling of the cold ahamber fan motor.

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- 1 31 635q These and other objects of the :invention will become manifest to those ver~ed ln the art upon study and reviewal of the teachinys o~ the di~closure herein.

SUMMARY OF THE INVENTION

According to the principles of one aspect of the present invention~ a refrigerated cooler with an internal cold chamber nas a refrigeration chassis on one of the vertically spaced cabinet ends, a low side with an evapor-ator and evaporator fan, a high side with a compressor and a condenser coil, a high side air inlet duct between the chassis and a first wrap side of the cooler, a high side outlet duat between the chassis and a second wrap side of the cooler, an inlet deflector between the ~hassis and the *irst wrap side, and an outlet air deflector between the chassis and the second wrap side; the high side air flow is directed in a U-shape around the low side.

A refrigerated cooler according to a further aspect of the invention has an insulated cabinet with an internal cold chamber, a refrigeration chassis having a low side and a hiqh side an evaporator fan in the low side, a fan motor outside of the low side, a shaft connecting the ~5 motor to the fan, and a cold air structure between the fan and the motor for drawing cold air from a pressure zone behind the fan and directing the cold air upon the fan motor to cool the motor.

A refrigerator chassis for a cooler preferably has a high side, a low side, an evaporator fan motor outside of the low side, a fan motor shaft extending into the low side to an evaporator fan in the low side, struc-ture for taking cold air from a pressure zone downstream of the fan to outside of the low side, and structure for directing the cold air upon the fan motor.
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, A refrigerator chassis ~or a cooler pre~erably has a high side, a low side, an insulated shell around the low side, a high side air panel having a central portion parallel to and spaced from a shell side, an inlet air deflectox extending ~utward of the central panel and around toward the shell, and an outlet air deflector extending outward from an outlet end of the central panel and around toward the shell; the structure defines a U-shaped passage Por flow of air through the high side and around three sides of the low side.
A method of cooling a cooler according to a still further aspect of the invention, has the steps of chilling an evaporator, transferring heat from the evaporator to a condenser, drawing ambient air from the rear of the cooler, propelling the drawn air transversely through the conden-ser, and exhausting the heated ambient air to the rear of the cooler while directing the flow of ambient air in a U-shape around and spaced from the evaporator.
A method of cooling a cooler according to a yet still further aspec* of the invention has the steps of chilling an evaporator, drawing air over the evaporator to cool the air a~d propelling the air to a work load in a cold chamber of the cooler, taking some cold air from the propelled flow and directing it outside of the cold chamber to an exterior motor Por the evaporator fan, and cooling the fan motor with the taken and directed cold air.
A method of cooling a cooler preferably has the steps of chilling an evaporatorl drawing air over the evaporator and propelling the air with an evaporator fan, taking some of the cold air to outside of the cold cham-ber, directing the taken cold air upon an evaporator fa~
motor, and cooling the fan mokor with the cold air as the motor powers the fan to circulate cooled air within the cooler.
These and other advantages cf the invention will become manifest to those versed in the art upon review and - 7 ~
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131635q study of the teachings o~ the pre~rred embodimenk of the invention hereinafter described.

5BRIEF DESCRIP~ION OF THE DRAWINGS

FIGURE 1 is a perspective view looking downward at the pr~erre~ embodiment of a refrigerated cooler according to the present invention;
10FIGURE 2 is a persp~ctive view of the rear side of tha structure of FIG. l;
FIGURE 3 is a top plan view of the refrigeration chassis of the structure o~ FIG. 1 with the top cover taken o~f;
15FIGURE 4 is a sectional elevational view of the structure of FIG. 3, taken through lines IV-IV;
FIGURE 5 is a sectional detail plan view of the rear corner of the structure of FIG. 1;
FIGURE 6 is a rear elevational view of the 20structure o~ FIG. 1 with the shroud taken of~;
FIGURE 7 is a plan view of the high side air panel of the structure of FIG. 3;
FIGURE 8 is an elevational seational view of the structure of FIG. 3, taken through the centre line of the 25evaporator fan motor, and FIGURE 9 is an elevational sectional view taken throu~h lines IX-X of FIG. 8.

DESCRIPTION OF ~E PREFERRED EMBODIMENT

~he refrigerata~le cooler, generally indicated by the numeral 10 in FIGS. 1 and 2, has a cabinet 11 and a pair of doors 12 which enclose an internal cooling chamber 13. A plurality of shelves 14 are inside the cooler 10.
35~he shelves 14 are typically a grid of wires enabling air circulation through the shelves 14, and the cabinet floor 15 is usable as the lowest support for good~ to be sold X

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1 31 635q (not ~hown~ such as soft drinks and dairy products~ The doors 12 are preferably hinged to the cabinet 11 and are openable from the centre as shown in FIG. 1. Each door 12 has a peripheral structural frame 16 and a transparent centre 17 preferably of multilayer glass. Each door 12 has a suitable and conventional airtight gasket 18 which seals the door 12 to ~he cabinet 11 when ~he door 12 is clo~ed.
~n a~vertising sign 19 which pre~erably is backlighted, is mounted to the cabinet 11 above the doors 12. On the rear of the cabinet 11 is a shield 20 which will be explained further, and on top is a waterproof cover 21 having a waterproof cooler control cover 22.

~ he refrigeration chassis, generally indicated by the numeral 25, is best shown in FIGS. 3 and 4, and has a high side 26 and a low side 27. The high side 26 has a condenser coil 28, a condenser ~an and motor unit 29, a refrigeration compressor 30 and the refrigeration control 31. The low side 27 has an evaporator coil 32, a conden-sate collector and baf~le 33, and a propeller-type evapor-ator fan 34. The fan 34 is mounted on a motor shaft 35 which in the preferred embodiment shown in the drawings extends f~om an evaporator fan motor 36 in the high side 26. The evaporator 32, baffle 33 and fan 34 are all in an air cooling chamber 37 o~ the low side 27, and the chamber 37 is enclosed on its top and all four sides by an insu-lated wall 38 which is open on its bottom to register with an air inlet 39 and an air outlet 40 of the cooling chamber 13.
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A preferred feature of the present invention resides in the structure ~or providing air ~low in a U
shaped path through the high side 26. The chassis 25 is positioned about in the transverse centre of the cooler 10, is narrower in width than the cooler 10, and is spaced inward from both of the cooler wrap sides 41, 42. The X

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chassis 25 has a front side 43 which is secure~ to and spaced from the ingulated wall 38 by fore-a~t braces 44O
Between the wall 38 and the front side 43 is a transverse air flow passageway through the condenser 28 and over the compressor 30 and the evaporator ~an motor 36.
As shown best in FIG. 3, the space between the cabinet wrap first side 41 and the first chassis end 45 forms a high side air inlet duct 46 having an inlet 47 flush with the cabinet backside 48 and the backside 49 of the chassis 25, and the space between the cabinet wrap second side 42 and a second chassis end 50 forms a high side ambient air outlet duct 51 havlng an outlet 52 flush with the backsides 48, 49. The front of the inlet duct 46 ls bounded by an inlet air deflector 53 which is concavely curved as shown and which closes off the space between the wrap side 41 and the front side 43. The front of the outlet duct 51 is bounded by an outlet air deflector 54 which is concavely curved as shown and which closes off the space between the wrap side 42 and the front side 43.
FIG. 6 best illustrates the structure of the ends of the deflectors 53, 54. Each deflector 53, 54 has an outer distal end 55 which is pre-loaded against the inside of a respective wrap side 41, 42 to give an effective airtight seal. Each deflector 53, 54 has an ear 56 which i9 fastened by a screw 57 to a rolled over flange 58 on a respective wrap side 41, 42. The deflectors 53, 54 and the front side 43 are a common single piece structure formed from the sheet metal blank shown in FIG. 7: with this construction there are minimal air leaks and no gaskets to worry about. The sign 19 is removable and the chassis 25 is accessible and removable from either the front or back of the cooler 10.

The shield 20 is secured to the cabinet back side 48 by standoff fasterlers 59 as best shown in FIG. 5. The shield 20 is over the inlet 47 and outlet 52 and has a waterproof snow and rain cap 60 above the inlet 47 and outlet 52. The shield 20 has a rear panel 61 which is spaced rearward of the cabinet backside 48 and which extends from the rain cap 60 to well below the inlet 47 and outlet 52~
The rear panel 61 has a set of downward directed louvers 62 to the rear of the inlet 47 and the outlet 52. The louvers are at least as wide as the inlet 47 and outlet 52. In the center of the rear panel 61 is a Z-shaped vertical barrier 63 that extends from the rain cap 60 to the bottom of the rear panel 61. The rear panel 61 has a pair of opposed sides 64 that are each folded over and butted against the cabinet backside and held by the fasteners 59. The fasteners 59, folded over sides 64 and barrier 63, all hold the rear panel 61 out so it cannot be collapsed against the backside 48.
The shield 20 forms a vertically directed opening 65 in between the sides 64. The opening 65 opens downwardly so that ambient air is both taken in and exhausted generally downward in divided streams which are separated from each other by the barrier 63.
The top cover 21 has four flanges 66 that come down over the sign 19, rain cap 60i and cabinet sides 41, 42 so that rain cannot enter the chassis 25. The waterproof control cover 22 above the control 31 is selectively open to give access to the control 31 only from above the cooler 10 so that customers and unauthorized employees do not have access and cannot easily tamper with the control 31.
pr~err~
1 Another~ impo-E~ant-- feature of this invention is that the evaporator fan motor 36 is normally cooled by the structure shown in detail in FLGS. 8 and 9. The fan motor shaft 35 extends through an opening which forms a cold air outlet 70 in the insulate~ wall 38. The cold air outlet 70 is fed by a plenum chamber 71 formed between a metal hat section 72 securad to a cold wall 73. A gasket 74 seals the evaporator fan mokor 36, which preferably is an open frame motor 36, to the cold air ou~let 70. The hat section 72 and the plenum 71 extend generally horizon~ally and transversely across and in the insulated wall 38 to beyond the diameter of the avaporator ~an 34 as best shown in FIG.
~. There is a cold air inle~ 7~ in each end of the plenum 71: both cold air inlets are outside of the diameter of the evaporator fan 34 and in a pressure zone 76 which is downstream of the evaporator fan 34 and the baffle 33. A
small orifice extends through the insulated wall 38 into the inlet duct 46 and forms a pressure break inlet 77 just upstream of the evaporator coil 32. An air sPal 78 is mounted over the shaft 35. The air seal 73 preferably comprises a layer of double backed adhesive coated foam and a washer of thin aluminum. The air seal 78 is adhesively secured on the wall 73 only after the motor 36 has been ~0 fastened in place and the seal 7~ has almost a zero clear~
ance on the shaft 35. The cold air outlet 70 and seal 78 are co-axial with and about the shaft 35 and the fan 34 i~
placed on the shaft 35 aPter the seal 78 has been secured.
The plenum 71 forms an air conduit from each of the cold air inlets 75 to the cold air outlet 70.

In the operation of the cooler 10 and in the practice of the preferred methods of the present invention, the evaporator 32 is chilled and cabinet air i~ drawn from the cooling chamber 13 and through the evaporator 32. The cooled cabinet air is then propelled by the fan 34 against the wall 73 and then through the cabinet inlet 40 and through the cooling chamber 13 wherein a workload of product is cooled. ~ownstream of the fan 34 and on the wall 73, there is a low pressure zone ...

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~ 31 6359 around the shaft 35 and a high pressure zone at and beyond the outer diameter of the fan 34. The fan motor cold air inlets 75 are both in the high pressure zone. soth the low and high pressure zones are primarily a con.sequence of the centrifugal force of the air being rotated by the fan blade 34. This centrifugal force is of a significant magnitude.
The high pressure forces just cooled cold air through -the inlet 75 and into the plenum 71 and through the outlet 70 and around the motor shaft 35 and through the motor 70 where the cold air goes directly over the motor windings. This cooling air flow occurs at all times when the fan motor 36 is on. The air seal 78 prevents suction of air back into the cabinet past the motor shaft 35. The pressure break inlet successfully serves two functions. The coollng air that propelled out through the motor 36 has to come from somewhere; it comes from the pressure break inlet 77. This break inlet 77 is the throttle that restrictively controls how much air can be propelled out through the motor 36 and the break inlet 77 is sized to control the air flow. The break inlet 77 also prevents the fan 34 and motor cooling system from pulling an excessive partial vacuum in the cooling chamber 13. If an excessive partial vacuum is in the cooling chamber 13, it takes a tremendous pull to open the se~aled front doors 12 because each door has an area of about ten to fifteen square feet. However, a slight vacuum is maintained in the cabinet 11 to keep the doors 12 closed.
This break inlet 77 is smaller and has a lesser air flow than the cooling air path including the inlets 75, plenum 71, outlet 70 and the pathway through the motor 36. The fan motor 36 and the fan 34 are run continuously and they do not transfer waste heat into the cooling chamber 13: a small amount of the cold air is drawn from the cooling chamber 13 , 1 31 b35~`~

to keep the motor 36 cooled regardlegs of whether or not the condenser fan 24 is blowing air over the exterior of the frame of the evaporator fan motor 36.
The high side 26 i5 operative when the low side 27 is cooling and the compressor 30 and condenser fan 29 are running. Ambient air is drawn upward through the inlet louvers 62 and upward inside the shield 20. The ambient air is then drawn forward in the inlet duct 46 and is directed around the corner by the inlet air deflector 53 and through the condenser coil 28 and over the evaporator fan motor 36 and the compressor 30. The ambient air which now has the heat from the condenser coil 28, is then directed around the corner by the outlet air deflector 54 and then rearward through the outlet duct 51 and then downward and out of the outlet louvers 62 and downward and out of the shield 20. The louvers 62 and the barrier 63 keep the inlet flow of ambient air clean of leaves and grass and paper and ground dirt and debris, and keep the ambient inlet flow and heated exhaust flow separate from each other and directed away from the customer and the doors 12 regardless of whether the cooler 10 is under a short ceiling or against a wall. The air taken in is not heated by sunlight beyond normal, and the cooler 10 stays neat and clean and is silent. The controls 31 are top mounted where they will not come in contact with explosive or corrosive fumes at ground level. The cooler 10 protects itself well from rain,~ sleet, snow, winds, sunlight, leaves, seeds of trees and other plants, and ground debris. The high side 26, low side 27 and controls 31 are all relatively inaccessible to the public and the cooler 10 is quite tamperproof.
This new and improved cooler 10 enables the placement of glass door coolers inside, outsidel in service -~14 -- : ~ ': , .

stations, in unattended places, under low ceilings, against wall and enables new methods of merchandising and energy conser~ation to be considered.
~ lthough various minor modifications may be suggested by tnose versed and experienced in the art, be it understood that I wish to embody within the scope of the patent warranted hereon all such embodiments as reasonably and properly come within the scope of my contribution to the art.

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Claims

1. A refrigerated cooler having an insulated cabinet with an internal cold chamber and a refrigeration access opening to the chamber in a top end of the cabinet, comprising:

a) a refrigeration chassis mounted on the cabinet top end, said chassis having a low side and a high side, the low side having an evaporator and a fan to move air across the evaporator, the high side having a condenser coil and a compressor and a condenser fan and motor, said chassis having first and second opposed ends which are both spaced from first and second opposed sides of a cabinet wrap;

b) a high side air inlet duct along the first chassis end, said inlet duct being bounded on the inside by the chassis and on the outside by the first wrap side, there being a high side inlet to the duct between the first chassis end and the first wrap side, c) a high side air outlet duct along the second chassis end, said outlet duct being bounded on the inside by the second chassis end and on the outside by the second wrap side, there being a high side outlet from the duct between the second chassis end and the second wrap side;

d) an inlet air deflector between the chassis first end and the first wrap side, said deflector having a surface positioned for deflecting an incoming air flow into the condenser coil; and e) an outlet air deflector between the chassis second end and the second wrap side, said outlet deflector having a surface positioned for deflecting an outgoing air flow to the high side outlet.

2. The cooler of claim 1, including a shield over the high side inlet and outlet, said shield having a vertically directed opening in between a pair of opposed sides.

3. The cooler of claim 2, in which said opening is directed downward, said shield including a water-proof rain cap above the opening and the high side inlet and outlet.

4. The cooler of claim 3, in which the shield includes downwardly directed louvres above the opening and below the rain cap, there being inlet louvres spaced outwardly from the high side inlet and outlet louvres spaced outwardly from the high side outlet, said inlet and outlet louvres being spaced transversely from each other.

5. The cooler of either of claims 1, 2 or 4, including a barrier on a third wrap side, said barrier being between the high side inlet and the high side outlet and forming an obstruction to flow of exterior air between the high side inlet and outlet.

6. The cooler of claim 1, in which the chassis is mounted on a top end of the cabinet and said access opening is through the top end, both the high side air inlet and high side air outlet being on the back side of the cabinet.

7. The cooler of claim 6, including structure for preventing rain from entering the high side air inlet and outlet, and a waterproof cover over the chassis and said structure.

8. The cooler of claim 7, including a top mounted refrigeration control mounted under the cover, and a waterproof control cover normally precluding access to the control.

9. The cooler of claim 2, in which the shield is spaced rearward of a cooler back side, and including rigid structural stand-off spacers inside of the shield for preventing collapse of the shield, said spacers fastening the shield to the back side.

10. The cooler of claim 9, including a generally vertical barrier in between the air inlet and outlet, said vertical barrier spacing the center of the shield from the cooler back side, said shield being fastened to the barrier.

11. The cooler of claim 2, in which the chassis is flush with a cooler back side, in which the air inlet and outlet are co-planar with the back side, and in which the shield is spaced rearward of the back side.

12. The cooler of claim 1, in which the air deflectors and a front side of the chassis are a common structure.

13. The cooler of claim 12, in which the deflectors are secured to the chassis ends.

14. The cooler of claim 1, including a transverse air duct in between the deflectors, said duct being through the high side and being forward of the low side.

15. The cooler of claim 14, in which the inlet and outlet ducts extend along the first and second chassis ends, respectively, between the first and second wrap sides.

16. The cooler of claim 1, in which the distal end of each deflector is secured to a respective cabinet wrap side.

17. The cooler of claim 14, in which a low side air circulation fan motor is mounted in the transverse air duct and transversely in between the deflectors.

18. The cooler of claim 1, in which the distal end of each deflector is pre-loaded against the inside of a respective cabinet wrap side.

19 19. The cooler of claim 18, in which the deflectors are each curved between the chassis and a respec-tive cabinet wrap side.

20. An insulated cabinet with an internal cold cham-ber, comprising:

a) a refrigeration chassis mounted to a top of the insulated cabinet, said chassis having a low side and a high side, the low side having an evaporator and a fan to move air across the evaporator with said evaporator and said fan being in fluid communication with the cold chamber, and the high side having a condenser and a compressor;

b) an evaporator fan motor mounted outside of the cold chamber, said motor having a shaft extending from the high side into the low side and connected to the evaporator fan;

c) a cold air plenum in a wall between the evaporator fan and the fan motor;

d) a cold air outlet from the plenum to the fan motor for supplying cooling air to the fan motor from the cold chamber; and e) a cold air inlet through the wall and into the plenum, said inlet being spaced from the motor shaft and being in a positive pressure zone adjacent the evaporator fan.

21. The cooler of claim 20, in which the fan motor is mounted to the outside of said wall, and including a gasket between said wall and the fan motor, said motor having an open frame so that the flow of cold air is directed through the motor.

22. The cooler of claim 24, including a pressure break air inlet into the cooling chamber.

23. The cooler of claim 21, in which the pressure break air inlet is immediately upstream of the evaporator.

24. The cooler of claim 20, in which the plenum outlet is co-axial with and about the fan motor shaft.

25. The cooler of claim 24, including a shaft air seal mounted on the wall in between the wall and the evaporator fan.

26. The cooler of claim 20, in which the plenum is a metal hat section secured to the outside of the wall, the cold air inlet being in an end of the hat section and being spaced from the fan motor.

27. The cooler of claim 20, in which the cold air inlet is spaced beyond the diameter of the evaporator fan.

28. The cooler of claim 27, in which the plenum is a conduit on the outside of the wall from the inlet to the fan motor shaft.

29. The cooler of claim 20, in which the evaporator fan is an axial flow fan of predetermined diameter, in which the plenum is a horizontal duct extending transversely to each side beyond the diam-eter, the cold air inlet being outside of the fan diameter, and the cold air outlet being immedi-ately around the motor shaft.

30. A refrigeration chassis mounted to a top end of a refrigeratable cooler, comprising:

a) a transverse high side having a compressor, a condenser coil and a condenser fan and motor;

b) a low side having an evaporator coil, an evaporator fan, baffle structure forming a path for air to come into the low side and through the evaporator coil and thence out of the low side;

c) an insulated shell about the low side and a chassis for the high side, the chassis and shell being secured to each other, said shell having first, second and third insu-lated sides;

d) a high side air panel having a central por-tion parallel to and spaced from shell second side with the compressor and conden-ser coil and condenser fan being between the central portion and the shell second side, the condenser coil being perpendicular to the shell second side;

e) an inlet air deflector extending outward from an inlet end of the central panel and around toward the shell first side, the deflector and first side ...

jointly defining an inlet air passageway which comes past and is generally parallel to the first side and turns ninety degrees between the deflector and the shell to go into the high side;
and f) an outlet air deflector extending outward from an outlet end of the central panel and around toward the shell third side, the outlet deflector and third side jointly defining an outlet air passageway which comes out of the high side and turns ninety degrees between the outlet deflector and the shell to go past and generally parallel to the shell third side, with g) the air flow passageway into and through and out of the high side being a U-shaped passageway around the low side and between the shell and the high side air panel.

31. A refrigeration chassis according to claim 30, in which the central portion, inlet air deflector and outlet air deflector comprise a unitary side high side air panel.

32. A refrigeration chassis according to either of claims 30 or 31, in which each deflector has an outer ear with means for securement of the deflector to the cooler.

33. A refrigerated cabinet, comprising:
a cabinet housing having an exterior surface and defining a refrigerated space therein and the housing having top end and a bottom end, an evaporator, secured within the refrigerated space and an evaporator fan adjacent the evaporator for providing heat exchange contact with the evaporator of air within the refrigerated space for cooling and circulating thereof, an air duct housing secured to the exterior of the cabinet housing on the top end thereof and defining an air duct space, the air duct space containing a condenser fan and condenser fan drive motor, a compressor and an evaporator fan drive motor, the evaporator fan drive motor connected to the evaporator fan by a shaft extending through the cabinet housing into the refrigerated space, and the air duct having an inlet end and an outlet end for facilitating air flow therethrough for cooling the condenser.

34. The apparatus as defined in 33, and the refrigerated space including an evaporating chamber in air communication with the refrigerated space, the evaporator and evaporator fan in the evaporator chamber and the refrigerated space including means for directing air to the evaporator chamber and away from the evaporator chamber through operation of the evaporator fan for facilitating the circulation and cooling of the air in the refrigerated space.

35. The apparatus as defined in claim 34, and the duct inlet and outlet including means for directing intake of air therein and outlet of air therefrom, respectively.

36. The apparatus as defined in either of claims 33, 34 or 35, and further including means for directing cooled air from the refrigerated chamber to the evaporator fan drive motor for cooling thereof.

37. The apparatus as defined in claims 33, 34 or 35, and further including means for providing restricted air communication between the refrigerated space and the air duct for preventing the formation of an excessive partial vacuum in the refrigerated space.