DD228886A5 - WAERMETAUSCHERANORDNUNG - Google Patents

Abstract

The invention relates to a Waermetauscheranordung for automatic defrosting of the heat exchanger in the standard cavity of compressor Kühlehlenken with several Kuehlraeumen. With the invention, a well controllable de-icing and de-icing process is achieved without additional expenditure of energy at relatively low design effort. The essence of the invention is that the evaporator plate is disposed in the entire volume below the closed freezer compartment and are provided on the connecting lines between the heat exchangers of the standard and the freezer compartment refueling elements. As a result, the defrosting heat exchanger can heat up after the individual cooling period under the influence of the natural heat flow during standstill and automatically defrost it.

Description

-2- 674

The object underlying the invention is thus achieved in that the thawing heat exchanger is heated by the action of naturlcihen heat flow in the downtime after each cooling period.

As is apparent from FIGS. 2 and 3, 2 surface-enlarging elements 8 are connected to the connecting lines 7 between the heat exchanger of the freezer compartment 1 and the cooling space, which prevent icing. The elements 8 were

covered by a cover member 9, wherein the cover member 9 is in communication with a heat exchanger plate 10 of the cooling chamber 2.

The inventive solution is a fully automatic defrosting of household refrigerators without the use of

allows energy consuming auxiliary equipment and solved the removal of the occurring in normal operation ripening and ice formation in a simple manner.

The proposed solution can be used in compressor refrigerators with a freezer compartment of different classification

proper selection of the evaporator heat exchanger surface and be used with the same cabinet training.

Claims (3)

1. Heat exchanger assembly for automatic defrosting of the heat exchanger in the normal refrigeration room of compressor refrigerators with multiple cold rooms, characterized in that an evaporator plate (4) in the entire volume below a closed freezer compartment (1) is arranged and on the connecting lines (7) between the heat exchanger of the Normal cooling room (2) and the freezer compartment (1) oberfiächenvergrößernde elements (8) are provided. -1- 674 Invention claims: 2. Heat exchanger arrangement according to claim 1, characterized in that the evaporator plate (4) has on both sides additional heat transfer surfaces. 3. Heat exchanger arrangement according to claim 1 or 2, characterized in that the elements (8) by a, with the heat exchanger metallically connected cover element (9) are covered. For this 2 pages drawings Field of application of the invention The invention relates to a heat exchanger assembly for automatic defrosting of the heat exchanger in the normal refrigeration room of compressor refrigerators with multiple refrigeration rooms. Characteristic of the known technical solutions It is known that the moisture content of the air is reflected on the coldest surfaces or on the cooling and freezing devices of a refrigerator. On these constructive elements of the cooling units is constantly produced frost and ice, which significantly reduce the efficiency of the heat exchanger. Most of the commercially available refrigerators have a semi-automatic defrost with automatic downshift. With these devices, it is sufficient to depress the defrost knob of the temperature controller when the defrost is desired. As a result, the compressor is put out of service until the heat exchanger is completely de-iced. Thereafter, the collected in a plastic vessel, thawed water is poured out and put back the vessel. If, on the other hand, the defrost is not switched on in time, so much ice builds up on the heat exchanger, which prevents proper functioning of the unit after reaching a certain thickness. This not only increases the temperature in the cold room and the stored food, but also the energy consumption. The disadvantages described above have been eliminated by the fully automatic defrosting device. To date, the automatic defrosting of refrigerators is solved by means of an electric heater. However, this solution has several disadvantages. A disadvantage is that a part of the evaporator surface of the normal cooling chamber is covered by the defrosting and thus the natural air flow along the evaporator plate is hindered. After each cooling period, a certain amount of heat Qf must be introduced into the cold room for evaporative defrosting. By this introduced amount of heat Q, the freezer compartment and the normal refrigerator is subject to greater temperature fluctuations than necessary. The amount of heat Qf introduced by the electric heater must be removed again by an additional cooling capacity. Object of the invention By the invention, the identified shortcomings are eliminated and achieved on the evaporator plate under circumstances occurring during normal operation, a well-controlled de-icing and deicing process without additional energy consumption, which reduces the standard, mediocre energy consumption by about a quarter. Explanation of the essence of the invention The invention has for its object to develop a heat exchanger assembly for an automatic defrost without electric heating. According to the invention the object is achieved in that an evaporator plate is arranged in the entire volume below the closed freezer compartment and are provided on the connecting lines of the heat exchanger and the freezer compartment surface-enlarging elements. According to a preferred embodiment of the inventive arrangement, the evaporator plate on both sides of additional heat transfer surfaces. The heat transfer surfaces are preferably covered by a cover member metallically connected to the heat exchanger plate. embodiment The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawings: FIG. 1: shows a schematic representation of a refrigerator, consisting of a freezer and cold rooms, with an evaporative heat exchanger according to the invention and the required control equipment Is provided.
2 shows an embodiment of the connecting lines between the heat exchangers, which are equipped with surface-enlarging elements, Fig. 3: the arrangement of the connecting lines of Fig. 2 in the refrigerator. According to FIG. 1, a sensor 3 of a temperature controller is arranged in the cooling space 2 below the closed freezer compartment 1 on the surface of an evaporator plate 4. The task of the sensor 3 is to turn off the engine compressor 5 at a predetermined temperature value. As a result, created in the cooling chamber 2, an air flow 6. During shutdown, the heat exchanger in the refrigerator 2 reacts directly to the increasing temperature and thaws automatically. The resulting due to a possibly insufficient surface frost and ice formation in the refrigerator and the connecting coolant lines between the two heat exchangers is excluded by additional oberflächenvergrößernde elements 8 and 9 by the cover elements and thereby all criteria of a fully automatic defrost are met.