FR2552863A1 - HEAT EXCHANGER DEVICE FOR AUTOMATIC DEFROST OF THE NORMAL COLD CHAMBER OF DOUBLE COLD CHAMBER COMPRESSOR REFRIGERATORS - Google Patents

Abstract

IN A HEAT EXCHANGER DEVICE INTENDED FOR AUTOMATIC DEFROSTING OF NORMAL COLD CHAMBER 2 OF COMPRESSOR REFRIGERATORS 5 TO DOUBLE COLD CHAMBER 2, 1, EVAPORATION PLATE 4 IS PLACED IN THE ENTIRE VOLUME LOCATED IN THE COMPARTIOUS FARMER 1, AND SURFACE INCREASE ELEMENTS ARE FITTED ON THE DUCTS CONNECTING THE HEAT EXCHANGERS OF COLD CHAMBER 2 AND FREEZER COMPARTMENT 1.

Description

Heat exchanger device for automatic defrosting of

  the normal cold room of compressor refrigerators with double cold room.

  The invention relates to a heat exchanger device for the automatic defrosting of the heat exchanger of the normal cold room of compressor refrigerators with a double cold room. Thanks to the device according to the invention, it is ensured that a defrosting process is obtained. and ice removal well adjusted and without particular energy consumption or electrical heating of the evaporation plate of the normal cold room under the prevailing conditions

in normal operation.

  It is known that the humidity contained in the air is deposited in the cold room of the refrigeration appliance on the most

  cold or on specific parts thereof.

  On these constructive elements of the refrigeration apparatuses appear continuously frost and ice, which is the

  causes significant problems because the heat transfer capacity of the heat exchanger is reduced.

  Most of the commercially available refrigerators have a semi-automatic defrost with automatic return to normal operation. For these devices, simply press the defrost button on the temperature controller when defrost is desired. The compressor is then stopped until the heat exchanger is completely freed of ice Then the water from the defrost which has accumulated in a plastic container fitted for this purpose must be removed and the container must be or put back in place If you forget to start the defrost, the ice builds up on the heat exchanger and interferes with the proper functioning of the appliance when the ice has reached a determined thickness. As a result, the temperature rises in the cold room and for the food stored there In addition, consumption

energy also increases.

  The disadvantages described above are eliminated by defrosting

  fully automatic refrigeration appliances Until now, automatic defrosting of refrigeration appliances has been achieved by electric heating.

  Defrosting by electric heating has several disadvantages One of them consists in the fact that part of the evaporation surface of the normal cold room is covered by the defrosting heating unit, which hinders natural passage air along the evaporation plate After each cooling period, a certain quantity of heat Qf must be introduced into the cold room in order to defrost the frost caused by evaporation. of the amount of heat Qf which is thus introduced, the freezer compartment and the normal cold room are subjected to greater temperature changes than is necessary The amount of temperature Qf which has been introduced by electric heating must be removed by a

subsequent cooling.

  The object of the invention is to eliminate the drawbacks mentioned and to ensure automatic defrosting of refrigeration devices without electric heating, so as to reduce the average energy consumption by about a quarter.

according to the norms.

  The object indicated is achieved by means of a heat exchanger device intended for the automatic defrosting of the cold room of compressor refrigerators comprising a cold room and a freezer compartment, in which an evaporation plate is arranged in the entire volume located below the closed freezer compartment and elements for increasing the surface are formed on the pipes connecting the heat exchangers of the

  cold room and freezer compartment.

  According to a preferred embodiment of the device of the invention, the evaporation plate comprises on its two sides of

  additional heat transfer surfaces.

  According to another preferred embodiment, the surfaces of

  heat transmissions are covered by a covering element 35 connected metallically to the heat exchange plate.

  The technical solution according to the invention will now be described in more detail using preferred embodiments and with reference to the accompanying drawings in which: FIG. 1 represents an embodiment given by way of example of the apparatus refrigeration comprising an evaporative heat exchanger, comprising a cold room and a freezer compartment, with regulating elements and an air flow caused by the arrangement according to the invention, Figure 2 shows by way of example a embodiment 10 of a connection section of this type arranged between the heat exchangers, the connection section being provided with elements for increasing the surface ensuring complete heat exchange or defrosting and removal of the ice. , and

  Figure 3 shows the arrangement of the embodiment of the invention according to Figure 2 inside the cold room.

  According to FIG. 1, a detector 3 of a temperature regulator is mounted in a cold room 2 below a closed freezer compartment 1 on the surface of an evaporation plate 4 of the mentioned cold room Le r 6 the action played by the detector 3 consists in switching off a motor compressor 5 when a determined temperature has been reached. As a result, an air flow 6 is formed in the

cold room 2.

  When stopped, the heat exchanger located in the cold room 2 reacts directly to the increase in temperature and performs an automatic defrost. The formation of frost and ice in the cold room 2 from a possibly insufficient surface is avoided. on the refrigerant line connecting the two heat exchangers by increasing the heat emitting surface of the mentioned route An increasing deposit of frost and ice is excluded by the surface increasing element 8 and by the covering element 9, and it follows that all the criteria for a totally defrosting

  are thus respected.

  Thanks to the heat exchanger device according to the invention, the aim 35 is achieved because the heat exchanger performing the defrost heats up when stopped under the effect of the natural hot flow which has

  place after each individual cooling period.

  As can be seen in Figures 2 and 3, a pipe 7 connecting the heat exchangers of the freezer compartment 1 and the cold room 5 is connected by its two sides to auxiliary elements 8 preventing the formation of ice The auxiliary elements 8 mentioned are covered by a decorative covering element 9, and so that the mentioned covering element 9 is also

  in connection with a heat exchanger plate 10 of the cold room 10 2.

  Thanks to the invention, the fully automatic defrosting of domestic refrigerators allows the use of energy saving auxiliary devices, and the elimination of frost and ice which form in normal operation is ensured by a process which is simple by comparison with the methods known so far. The technical solution which has just been exposed can be used in compressor refrigerators comprising a freezer compartment of any class due to a correct choice of the heat exchange surface by evaporation and while

  retaining the shape of the refrigerator.

  The invention is not only limited to the embodiment described above in detail by way of example and shown in the drawing. Apart from what has been described, there is also the possibility of constituting the evaporator situated between the two cold rooms in a different way. With regard to its operation,

  this solution is consistent with the invention.

Claims (3)

  1 Heat exchanger device for automatic defrosting of the normal cold room of compressor refrigerators with double cold room, characterized in that an evaporation plate (4) is arranged in the entire volume located below a closed freezer compartment (1) and in that surface increasing elements (8) are formed on the pipes (7) connecting the heat exchangers of a cold room (2) and the compartment freezer (1).   2 heat exchanger device according to claim 1, characterized in that the evaporation plate (4) comprises on its two   sides of additional heat transfer surfaces.   3 heat exchanger device according to claim 1 or 2,   characterized in that the surface increasing elements (8) are covered by a covering element (9) connected metallically to the heat exchanger.