DE4311160A1 - Finned evaporator for domestic convection refrigerators and freezers - Google Patents

Description

The invention relates to a finned evaporator for Household convection refrigerators and freezers according to the generic term of Claim 1. It relates to a pre-assembled in the narrower sense Evaporator unit with which the devices mentioned in the serial production be completed.

Refrigerators or freezers, which operate according to the forced-air cooling principle work (also known under the trade name "no frost" devices) also have an air blower. A channel system is used to help said fan the air from the interior of the evaporator fed, cooled there, dehumidified and then again blown back. Because air humidity on the evaporator is like frost precipitation, the evaporator becomes inoperative when the compressor is not in use thanks to an interval heating with an output of approx. 150 watts defrosted automatically. The condensation is evaporated into a shell arranged above the compressor passed. Additionally in Extend the internal cooling packs, mainly at Mains voltage failures, the storage period of the introduced cooling and Frozen goods. (From HEA picture service, series: refrigerators and freezers; July 1986 edition).

A "defrosting device" is known from DE 41 43 254 A1. The Defrosting device includes an insulating plate and one over it arranged heating plate. The heating plate consists of a thin plate made of aluminum or the like and a heating cable, which is at the bottom of the thin plate is arranged to the heat generated by the heating cable towards the carrier, the fins and the coolant tube of the evaporator transfer. Behind the back part of the evaporator is down directed a drain channel provided that the evaporator at Defrosting dripping water collects.  

Furthermore, from GM 87 12 962 is a "device for fastening a box evaporator ". Said box evaporator has pipe bends that protrude laterally from its plate pack. About these Pipe bends are shaped parts from both sides form-fitted. Both molded parts have raised molded Cones and studs over which the box evaporator in the side Insert slots of the freezer inner container is held.

In the latter prior art, only the attachment and Fixation of the actual evaporator without its entry mentioned accessories provided.

The invention has for its object known designs develop or improve, d. H. an easy to prepare to create complete evaporator unit (including the Defrosting device and all necessary accessory components), which in Circulating air cooling units can be installed quickly and easily.

This object is achieved according to the invention by the characterizing Features of the claim solved.

The advantages that can be achieved with the invention already result from Art and way of task; further advantages are: Reduction of assembly costs for serial production; in The vaporizer unit according to the invention can be used for customer service cases reduced work and costs are exchanged.

An embodiment of the invention is shown in the drawings and is explained in more detail below.

It shows

Fig. 1, the assembly and installation position of the complete lamellar evaporator in the inner container of a forced air-cooling or freezing appliance,

Fig. 2 shows the evaporator parts in an exploded view.

According to FIG. 1, an evaporator unit 1 consisting of various individual parts is inserted via guide knobs and supports at a high point into the inner container of a circulating air cooling device 2, which is shown in part, and is secured therein with a rail and secured in an inclined position. A fan 3 is used for air circulation. The inclined position of said evaporator unit 1 enables an unimpeded drainage of condensation water into a funnel 4 .

According to FIG. 2, a complete evaporator unit 1 consists of several individual components and is assembled or preassembled as follows: A trough-shaped insert lower part 5 , produced as a plastic injection molded part, has several spatially separated insertion pockets 6 for the position-secure accommodation of cooling accumulators 7 . Resilient latching hooks 8 projecting vertically upward are formed on the raised edges of the insert lower part 5 . A shaped recess 9 serves to receive a temperature sensor 10 . The insertion lower part 5 is thermally insulated by a molded cover 11 and closed with a precise fit. For this purpose, said mold cover 11 is laminated by means of aluminum foil and the cooling accumulators 7 are additionally covered in a manner not shown by heat-insulating foam molded parts (for example polystyrene). After laying the line 12 of the temperature sensor 10 and installing a heat conducting plate 13 , the lower insert part 5 is fully equipped. An insert upper part 14 has an obliquely inclined base surface 15 and liquid guide ribs 16 formed thereon and an outlet opening 17 for the evaporator condensation water. Rectangular recesses 18 are provided on the side walls of the insert upper part 14 , the dimensional arrangement of which corresponds to the position of the latching hooks 8 in the insert lower part 5 . A surface heater 19 is applied to the underside of the bottom surface 15 of the upper insert part 14 . The surface heating 19 prevents the condensation water dripping from the evaporator fins from freezing again. Said surface heating 19 represents a finished part. It consists of a self-adhesive 0.15 mm thick aluminum foil. The adhesive layer is covered with a removable protective film. A meandering and thermally secured heating cord is welded onto the opposite side of the film; their output is approximately 86 watts at 220 to 240 volts mains voltage. The adhesive layer of the surface heating 19 ensures a good heat-conducting connection to the underside of the bottom surface 15 of the upper insert part 14 . The inserted upper part 14 is now snapped with the fully fitted lower part 5 positively and non-positively (via the mentioned locking hooks 8 and recesses 18 ).

The actual lamella evaporator 20 can now be fastened in a manner not shown on the bottom surface 15 of the upper insert part 14 . Ultimately, the above-mentioned finned vaporizer 20 is completed with the evaporator heater 21 (de-icing the fins), the plug-in evaporator sensors 22 , 23 and the coolant suction pipe 25 fixed via the holding bracket 24 . After all electrical supply lines and connections have been laid, the evaporator unit 1 thus completed, as mentioned at the outset, is pushed into the space provided for this purpose in a cooling device inner container via guide knobs and supports.

Claims (1)

Lamellar evaporator for domestic convection refrigerators and freezers, which can be inserted into the inner container of said devices via guide knobs and supports and secured in position by a rail, with a heatable plate with a drainage channel arranged below the evaporator and with an insulating plate arranged underneath, characterized by following features,

• a) that the heated plate is designed as a trough-shaped insert upper part ( 14 ) with lateral recesses ( 18 ),
• b) that below the insulating plate or a molded cover ( 11 ) a trough-shaped insert lower part ( 5 ) with molded insertion pockets ( 6 ) for cold packs ( 7 ), with a molded recess ( 9 ) for a temperature sensor ( 10 ) and with resilient locking hooks ( 8 ) is arranged
• c) that the insert upper part ( 14 ) and the insert lower part ( 5 ) can be snapped together with the aid of their recesses ( 18 ) and locking hooks ( 8 ).