Патент USA US2136222код для вставки
Nov. ‘8, 1938. . . ‘ R. H. STARR ' ' 2,13\6§2Z__2 REFRIGERATOR \ Filed Feb. 20, 1935 / INVENTOR ’" Fay/7200a’ /7.’ Sfarr ‘ %" BY . I W r,‘ ' 0/’ 0 ATTORNEY . Patented Nov. 8, 1938 2,136,222 UNITED “STATES PATIENT OFFlCE 2,136,222 ' REFRIGERATOR Raymond H. Starr, Kansas City, Mo.‘ Application February 20, 1935, Serial No. 2,363 ‘5 Claims. (Cl. 62—103) This invention relates to refrigerators and particularly to those of that character wherein merchandise upwardly for circulation around the refrigerating elements. condensation from therefrigerating elements is It is well known that moisturecontent of the merchandise on display is absorbed. by the air and‘ deposited on the refrigerating elements in ‘the form of “frost which .is added to by accumu lations caused by moisture laden air being car? ried into the refrigerating .compartments upon caught by drip pans that are supported over the merchandise undergoing refrigeration. In- re frigerators of this character, the drip pans not only interfere with circulation of air around the refrigerating elements, but they form‘ surfaces on which moisture in the air condenses and . 10 drips therefrom onto the merchandise. opening of the doors H. It is, therefore, the principal object of the pres elements and it is necessary to defrost the coils at frequent periods. When defrosting the refrig erating elements, the ice melts and drips there ‘ from in the direction of _the merchandise but» is 15 caught in a drip pan that is supported below the In accomplishing this and other objects of the invention, as hereinafter pointed out, I have pro refrigerating elements. videdimproved details of ‘structure, the preferred This construction takes care of the moisture’ from the refrigerating elementsbut due to the size and relatively low- conductivity of the pans, they tend to retain low temperatures and are'slow 20 to conform to air temperatures within the case. Consequently, air contacting the under surface of the pans reaches the dew point and, therefore, form of which is illustrated in the accompanying 20 drawing, wherein:- ‘ Fig. 1 is a cross ‘sectional view through adis ‘ play type refrigerator equipped with refrigerating elements and drip pans embodying the features of the present invention. 25. . _. Fig. 2 is an enlarged cross section through one condenses thereon and drips onto the merchan of the refrigerating elements and the drip pan associated therewith. dise. Fig. 3 is a detail perspective view of one end thereunder. ' ' I erating elements whereby the areas from which tion of the refrigerating surfaces. The sizev of the drip pans can thus be reduced to that suffi 30 cient to catch the water, thereby not only pro moting circulation of air about the refrigerating elements but reducing the thermal capacity of the pan so that the temperature of the pan is ' quicker to respond to the temperature of the air. 35 . ' _ ‘Fig. 5 is an enlarged perspective view of a por tion of one of the drip pans particularly illus trating. its construction whereby condensation in Consequently, the air does not as quickly reach the dew point when moving in contact with the the bottom of the. pan is prevented. pan. ' Referring more in detail to the drawing: l designates a conventional refrigerator‘ dis~ play caseincluding front and rear walls 2 and 3 connected by top and bottom walls 4 and 5 and end walls 6 to form a longitudinal refrigerating ’ compartment ‘I. Supported in the refrigerating ’ compartment is a plurality of ' superimposed shelves 8 and 8’ upon which merchandise is placed for display through transparent‘ panels 9 that are incorporated into the front wall 3. Access is had r ~ to the display on the shelves through openings l0 provided in the rear wall 2 and closed by doors I I. In display refrigerators of this character, refrig erating elements I! are usually located in the top of the compartment 1 and over the mer '55 chandise on display in order to provide natural gravitational movement of the cold air down wardly. from the relatively cold temperaturelsur ' rounding the refrigerating elements'and over the relatively warmer merchandise on the shelves and to movement of relatively warm air surrounding the 25 > the melting ice drips are limited to a small por Fig. 4 is a fragmentary vertical section through ‘ one of the refrigerating elements and drip pans supported \ I, therefore, provide ‘an arrangement of refrig of the refrigerating velements particularly illus trating their relation to the drip pans which 30 collect water resulting from defrosting of the refrigerating elements.’ _ ' it interferes with e?'iciency'of the refrigerating ent invention to provide a refrigerating element and drip pan construction which promotes circu lation of air and prevents condensation on the 15 under surface of the pan. , 'This frost accumulates to such an extent that 10 . ' Opposite facesof the pan have different capaci ties for absorbing radiant energy; that face which faces the refrigerating element is bright, while the other face is darkened. Thus the tempera ture of ‘the pan itself will be warmer than if both faces have equal capacities for absorbing radiant ' energy. 45 In thefillustrated instance, ‘the refrigerating . elements l2 are arranged in pairs designated I3 and I4 and extend longitudinally of the com partment, each element comprising intercon nected pipes l5 arranged in the form of a hollow 50 square with its diagonal axes in perpendicular and horizontal planes so that the radiating ?ns l6 thereon are ‘positioned with‘ the lower corners II thereof located in the perpendicular plane. 55 By thus locating the ?ns, moisture melting from the pipes gravitates downwardly over the faces of the fins and along the lower converging edges l8 and I9 thereof to the corners II, from where it drips into the drip pans above mentioned. 2 2,136,222 With this arrangement of the coils, it is clearly moving thereover from reaching the dew point. obvious that a drip pan need be provided of only sufficient width to catch the water dripping from The maintenance of this temperature also has the advantage in that it prevents formation of the corners II. ice in the pans that would cause them to over In order to insure that the water does not drip from the edges l8 and i9, the ?ns are pref so that the capillary action afforded by the spaces. therebetween is su?icient to retain the ?owing water in contact therewith until it reaches the ?ow when the refrigerating elements are de frosted. It is also possible to maintain the pans in relatively dry condition because the water does not freeze therein, but readily drains therefrom into the collecting pan and from there into the 10 points H. disposal pipe 24. erably spaced close enough upon the pipes [5 The drip pans 20 and 2| for the respective refrigerating sections are formed in the shape of troughs sloping from one end of the compart ment to the other where they empty into a col lection pan 22 having an opening 23 in one corner thereof connected with a waste pipe 24 leading to a sewer or other place of disposal. For convenience of construction, the troughs 20 and 2| are preferably formed of strips of sheet metal bent on their longitudinal centers to pro vide valleys 25 and upwardly diverging sides 26 '25 and 2‘! spaced apart a sufficient distance to as sure collection of the water dripping from the ?ns H. In order to stiffen the troughs and enhance the appearance of the upper edges thereof, they are preferably ?anged inwardly and then down wardly to lie against the inner faces of the 30 troughs as indicated at 2B. The pan 22 is also constructed of sheet metal and has ?aring sides 29 conforming to the side ?anges of the troughs as best illustrated in Fig. 3. In order to further reduce the thermal ca 35 pacity of the troughs and pan 22, they are pref erably constructed of a metal having high ther mal conductivity such as for example aluminium or an aluminium alloy of extremely light gauge. By thus constructing the pans, the high ther 40 mal conductivity thereof causes the temperature of the pans to more quickly assume the tem perature of the air circulating thereunder and substantially relieves the fins of condensation on the under surfaces thereof. air circulating thereabout becomes warmer and results in increased circulation about the cooling 20 elements. As the merchandise cools off, the heat radiation therefrom decreases and the pans cool off in the same proportion to correspondingly re duce air circulation about the cooling coils. From the foregoing it is apparent that I have 25 provided a coil arrangement and pan construc tion which prevents condensation on the under side of the pan that ordinarily drips upon the merchandise on display. By maintaining the pan at a temperature sub 30 stantially that of the air moving thereacross, the pan is maintained in relatively dry and sanitary condition. It is also obvious that since the pan is only of su?icient width to catch the moisture dripping 35 from the coils, it does not interfere with circula tion about the refrigerating elements, but due to the high temperature thereof, the circulation about the cooling elements is increased. What I claim and desire to secure by Letters 40 Patent is: 1. In a refrigerator, a cooling element having a row of drip portions for ice melted from said ele I have found, , ment, and a drip pan supported under said drip portions and having a polished inner surface however, that by treating the under surfaces of the pans with a dark coating having heat ab sorbing properties as indicated at 30, the metal quickly absorbs and retains heat radiated from the merchandise on display so that the tempera ture of the pan tends to approach that of the merchandise. ,The drip pans also provide means for con trolling air circulation about the cooling ele ments. For example, when warm merchandise is placed on the shelves, heat radiating therefrom 15 is absorbed by the coating 30 to raise the tem perature of the pans to approximately that of the merchandise. Upon heating of the pans, the ~ I have also found that byv providing the pan with a bright or polished upper surface, as in dicated at 3|, the radiant energy absorbing ca pacity thereof is greatly reduced and radiation of the heat absorbed through the lower heat absorbing face is inhibited in the direction of the cooling coil, the temperature of the coil, therefore, has less effect on the pan, and I am enabled to additionally raise the temperature thereof. The troughs are preferably supported under the respective cooling elements by means of hooks 32 engaging the lowermost pipe l5 and 65 having their lower ends connected to cross bars 33 extending transversely of the troughs in spaced relation to the bottom thereof. For example, assuming that the temperature facing said cooling element. 2. In a refrigerator, a cooling element having a row of drip portions for ice melted from said cool ing element, and a drip pan supported under said drip portions and having a polished inner sur face facing said cooling element and having a dark, heat absorbing outer surface. 3. In a refrigerator, a cooling element having a row of drip portions for ice melted from said cool ing element, and a drip pan supported under said L1 in drip portions and having a polished surface fac ing said cooling element and a heat absorbing surface on the side opposite said cooling element. 4. In a refrigerator, a cooling element in the refrigerator, and a drip pan supported under (30 said element‘and having polished surfaces fac ing said coolingelement and heat absorbing sur faces on the other sides thereof. ’ 5. In a refrigerator having a merchandise storage space, a cooling element for effecting circulation of air in said storage space, and a shield member interposed between said storage space and the cooling element and having a heat temperature of 40° the temperature of the drip absorbing surface facing said storage space for absorbing heat radiating from merchandise con tained in said space and having apolished sur face facing the cooling element for retaining the pan can be maintained at a constant tempera heat absorbed by the heat absorbing surface. surrounding the coils which may be termed a cold body is 30“ and the merchandise which may be termed a warm body is maintained at a ture of 38° which is more nearly that of the 75 merchandise and is high enough to prevent air RAYMOND H. STARR.