Abstract:
A condensate collection structure for collecting and evaporating liquid condensation from a refrigerator or freezer in which a bracket assembly attached to the refrigeration housing unit supports both a condenser tubing array and a removable condensate drain pan. The condenser tubing array extends within and adjacent the bottom of the condensate drain pan when the drain pan is attached to the bracket assembly.

Description:
FIELD OF INVENTION 
     The present invention relates to refrigeration devices that have a defrost cycle and more specifically to condensate collection structures for such devices. 
     BACKGROUND OF THE INVENTION 
     Refrigeration devices generally have a refrigeration loop including a compressor, a condenser, an expansion valve, and an evaporator. Typically, frost that is built up on the evaporator is melted by a self-defrosting feature and the condensate is collected in a condensate drain pan or similar container, so that heat or air flowing through the compartment will evaporate the condensate. 
     During a defrost cycle in a typical refrigerator or freezer unit, the evaporator is heated to melt the frost that has accumulated within the freezer. The condensate drains out of the freezer to a condensate drain pan located in the bottom portion of the refrigerator or freezer. The liquid condensate typically evaporates from the drain is pan before the next defrost cycle. A heat exchange coil disposed in or adjacent to the drain pan usually serves the purpose of evaporating the condensate and removing the superheat from the compressed refrigerant before it is discharged into the motor is compressor casing. The drain pan is typically mounted on the compressor housing in order to promote evaporation of condensate collected in the drain pan. 
     A number of prior art techniques have been proposed for evaporating collected condensate from the evaporator of a refrigeration device. An early example of such prior art techniques may be found in U.S. Pat. No. 2,626,509 wherein the patentee provides an array of condenser coils within an enclosed condensate pan which is permanently mounted within the lower compressor to return moist air to the refrigeration compartment through an attached conduit. 
     A further early example may be found in U.S. Pat. No. 2,355,289 wherein the patentee provides a refrigerator unit in the form of a self-contained air conditioning unit which has a condensate collection pan surrounding the hot coil of a compressor. Hot compressed gas flowing through the coil causes evaporation of the condensate and the condensate is picked up by air flowing over the compressor and the pan of condensate. 
     A later example of such a prior art technique may be found in U.S. Pat. No. 4,783,971 wherein the patentees disclose a refrigeration device which includes a condensate collection pan mounted over an array of condenser coils. During a defrost cycle, the compressor is deactivated and a heating coil proximate to the evaporator is activated. The resulting water is drained to the drip pan where a fan circulates air across the drain pan to cool the condenser coil and evaporate the water in the pan. 
     BRIEF SUMMARY OF THE INVENTION 
     This invention provides an improved condensate drain pan structure where the condensate will be quickly evaporated and where the drain pan itself is removable for cleaning. According to the present invention, a condensate collection structure includes a mounted bracket assembly that supports both a condenser tubing array and a removable condensate drain pan. 
     The bracket assembly is fixed to the bottom cabinet of a refrigerator or freezer unit by being cantilevered from a vertical wall thereof and supports a length of condenser tubing. The tubing may be wound in a serpentine manner to form a planar rectangular horizontal array. When a condensate drain pan is attached to the bracket assembly, the condenser tubing array fits down into and extends adjacent to the bottom of the drain pan. The condensate drain pan collects the condensate from the evaporator as it is heated during a defrost cycle. The liquid condensate collected in the condensate drain pan is evaporated out of the pan as it is heated by the condenser tubing during a refrigerator cycle. The condensate drain pan can be removed for cleaning by detaching the drain pan from the bracket assembly and then sliding the drain pan from underneath the condenser tubing array. The cantilevered mounting arrangement for the condenser tubing and the condensate pan eliminates complex mounting arrangements present in the prior art which increase assembly and repair costs. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a front perspective view of the bottom cabinet of a refrigerator incorporating an embodiment of the present invention; 
     FIG. 2 is a side cross-sectional view of the invention, the plane of the section being indicated by the line  2 — 2  in FIG. 1; 
     FIG. 3 is an enlarged cross-sectional view, the plane of the section being indicated by the line  3 — 3  in FIG. 2; and 
     FIG. 4 is an enlarged view of the drain pan connection to the bracket assembly. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring now to the drawings, FIGS. 1-2 show a condensate collection structure housed in a bottom cabinet  10  of a refrigerator or refrigeration device having a defrost cycle. The condensate collection structure  12  includes a bracket assembly  14 , condenser tubing  16 , and a removable condensate drain pan  18 . The bracket assembly  14  supports both the condenser tubing  16  and the removable condensate drain pan  18 . The condenser tubing  16  is connected to a compressor (not shown) provided in the rear of the bottom cabinet  10 . 
     The bracket assembly  14  has two elongated triangular brackets  20  and  22 , each with a vertical leg  24  and a horizontal leg  26 . The vertical leg  24  is fixed to a vertical wall  28  in the cabinet  10  of the refrigerator by mounting screws  32 , so that the brackets  20  and  22  are cantilevered into the cabinet  10 . The vertical leg  24  is provided with a drain hose insertion hole  34  to hold a drain hose (not shown), which drains the liquid condensate from the evaporator (not shown) into the condensate drip pan  18 . 
     The condenser tubing  16  is supported and located in semicylindrical transverse grooves  36  formed by the horizontal leg  26 . A cap strip  38  is provided on each horizontal leg  26  and is provided with semi-cylindrical transverse grooves  40  which cooperate with the grooves  36  to retain the condenser tubing  16  therebetween, as will be apparent. The condenser tubing  16  is wound in a serpentine manner to provide a number of parallel reaches  42  and to form a flat rectangular condenser tubing array  44  that fits into and extends adjacent or closely adjacent to the bottom of the condensate drain pan  18 . The condenser tubing may also be formed in other tubing array shapes depending on the size and shape of the condensate drain pan and refrigerator housing. The cap strip  38  is provided with connecting barbs  46 ,  48  and  50  which snap into corresponding slots  52  in the leg to sandwich the reaches  42  in the grooves  36  and  40  to thereby support the tubing array  44 . It should be noted that at least one of the barbs, for example, the barb  50 , is reversed to face its neighboring barb  48  to securely grip the horizontal leg  26 . The barbs  46 ,  28 , and  50  are sufficiently flexible to perform this function since the bracket assembly is made from a suitable plastic such as fiber-reinforced polypropylene. 
     The condensate drain pan  18  may also be made from polypropylene and is removably attached to the horizontal leg  26 . The condensate drain pan  18  collects the liquid condensate from the evaporator in the refrigerator as it is heated during a defrost cycle and drains into the drain hose. The liquid condensate collected in the drain pan is evaporated out of the pan as it is heated by the condenser tubing array  44 . The vaporized condensate is vented to the atmosphere or ambient space. The drain pan  18  is removably attached to the brackets  20  and  22  in a manner which may be seen most clearly in FIG.  4 . At the distal end of each bracket  20  and  22  there is provided a nose portion  54  which snaps into a detent  56  formed by indented portion  58  in a wall  60  of the pan  18 . It may be noted that this operation is facilitated by the fact that the vertical wall of the indented portions  58  is provided with a slight taper and that the nose portion  54  has an inwardly inclined end portion  62  which is cammed along the taper until the nose portion  54  snaps in place. This operation is conducted in a facile manner since the pan is plastic and, in the illustrated embodiment, has a nominal wall thickness of about 0.10 inch. The proximal end of the brackets  20  and  22  are provided with an arched recess  64  which is adapted to receive an opposite wall  66  of the pan  18 . The wall  66  has an interior taper forming a barb  68  which snaps over an inwardly projecting portion of  70  of the arched recess  64 . 
     Referring now to FIG. 3, a bottom  72  of the pan  18  is provided with a recess  74  for each cap strip  38 . The recess  74  permits the reaches  42  of the tubing array  44  to lie adjacent or closely adjacent to the bottom  72  of the pan  18  to more effectively accomplish the evaporation of the water in the drip pan  18 . 
     While the invention has been described with reference to a specific embodiment, various changes may be made and equivalents may be substituted for elements thereof by those skilled in the art without departing from the scope of the invention. In addition, other modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. The present invention herein is not to be construed as being limited, except insofar as indicated in the appended claims.