Heat exchanger for a refrigerator and a mode of manufacturing of the heat exchanger

FIELD: the invention refers to heating engineering and may be used in cooling technique.

SUBSTANCE: the heat exchanger for a refrigerator has a board, a pipeline for cooling medium being in heat conducting contact with the board and a layer of a holding material bounded with the board and the pipeline. The layer of the holding material is of bituminous composition with a stuff, at that the heat capacity of the stuff is larger then the heat capacity of the bitumen. The heat exchanger is manufactured by way of forming a foot consisting of a board, a pipeline and a plate out of bituminous composition, at that out of the plate by heating and pressing the packet they form a layer of holding material. At such execution the heat exchanger may be easily utilized.

EFFECT: provides firm joining of the layers of holding material with the board.

12 cl, 5 dwg

 

The technical field

The present invention relates to a heat exchanger such as an evaporator, condenser, etc. for a refrigerator with the card from being in heat-conductive contact with the circuit with the refrigerant piping and connected with the plate and pipe a layer of retaining material, and also to a method of manufacturing such a heat exchanger.

The level of technology

The heat exchanger of this type and the manufacturing method are known from DE 10938773 A1. At a known method of manufacturing curved in the form of meanders of the pipe is pressed against the circuit Board, and the intervals between the meanders of the pipeline are filled with the retaining means. As such retaining material can be used expanding foam or also with casting characteristics for example. These retaining materials of the road, and what is happening in their curing or foaming education polymeric mesh hampers their return and re-use when disposing of such evaporator.

Disclosure of inventions

The present invention is to create an inexpensive, recyclable heat exchanger for a refrigerator and method of its manufacture.

This problem is solved by a heat exchanger with signs of paragraph 1 and by a method with the characteristics of paragraph 13 of the claims.

The use of bitumen with which tavav for the formation of a layer of retaining material has the advantage of that, on the one hand, such materials are cheap, and on the other hand, are easy disposal because after disassembly of such a heat exchanger into its component parts obtained bituminous material without any substantial training and without loss of quality can be used for the manufacture of a new heat exchanger or for other purposes. In addition, the bitumen composition after cooling provides a very close contact of the pipeline with the base plate, resulting in higher thermal efficiency of the heat exchanger. In addition, the weight of the bitumen composition has the ability to store heat or cold, which in the case of the evaporator can reduce power consumption of the refrigerator.

The connection of the base plate and pipe using bitumen composition has high mechanical strength, and therefore the shape of the heat exchanger remains very stable when working with him in the process of mass production.

Due to tight capacity heated bitumen composition, it exactly follows the contours of the pipe and the base plate, resulting in moisture cannot seep between the pipe and the base plate, and thereby eliminates the risk of corrosion and the risk of separation of the pipeline of the base plate due to the formation of ice.

To improve heat transfer between the pipeline and paying the line is the gadfly may have a flattened cross-section on facing the Board broadened the side, to provide a planar contact between the plate and the pipe. Thanks planar contact heat-conducting contact between the pipeline and the card is always ensured even under unfavorable conditions.

To ensure a strong connection between the layer of holding material and the printed circuit Board may preferably be provided an adhesive layer that at least partially connects the layer of holding material with the Board.

This adhesive layer preferably consists of an adhesive that is activated by high temperatures. This simplifies the manufacture of the heat exchanger, as it allows pre-applied adhesive layer without any safety measures on the plate, intended for the formation of a layer of retaining material of the bituminous composition, and the adhesive ability of this adhesive layer acquires only after melting by heating a layer of retaining material.

The bituminous composition may in addition to bitumen contain from 50 to 80% filler. The filler, in the form of a single material or mixture of materials may be chosen based on the desire to minimize the cost, improve thermal conductivity or to optimize the heat capacity of the layer of holding material. High heat capacity leads to the fact that in the refrigerator, in which is embedded the invention, the evaporator, the compressor for a long time in order to abott, while mounted on the evaporator temperature sensor will show that the temperature has dropped below the lower limit, which should shut down the compressor. And Vice versa, takes place a long time after switching off the compressor until the evaporator and the inside of the fridge will heat up to the upper limit temperature at which the compressor turns on again. The increased duration of the phase of the on condition of the compressor at constant relationship phase included the status of the compressor to the total operating time of the refrigerator increases the efficiency of the refrigerator.

The preferred fillers are crushed stone or iron.

To protect the layer of holding material on the side opposite the circuit Board, it can be covered with a layer of varnish.

Recommended average thickness of the layer of holding material is in the range from 0.5 to 2 mm, preferably from 1.0 to 1.5 mm.

The manufacture of the heat exchanger of the above type can be made in a simple way through education package, which is a foot consisting of a Board, the refrigerant piping and plate of the bituminous composition, and further heating plate and crushing of the foot.

A short list of drawings

Other characteristics and advantages of the invention ensue from the following description of examples of COI the log with reference to the accompanying drawings. In the drawings shows:

figure 1 is a perspective projection by the invention of the evaporator;

figure 2 is a cut - out in the evaporator of figure 1; and

figure 3-5 - steps of the proposed method of manufacture of the evaporator.

Disclosure of inventions

Depicted in figure 1 in a perspective projection of the evaporator consists of a flat Board 1 made of aluminum sheet, which contains the line 2 refrigerant consisting of aluminum tube, curved in the shape of a meander. Charge 1 and line 2 refrigerant covered with a layer of 3-retaining material of the bituminous composition.

The bitumen composition is composed of approximately 25% by weight of the resin modified bitumen, 3% by weight of polymer and 72% by weight of a stone flour as filler. Usually the proportion of crushed stone may be from 50 to 80% by weight. If we take the density of bitumen 1100 kg/m3and the density of crushed stone 2800 kg/m3it corresponds to the volumetric content of a stone flour from 28 to 61%. A typical value of specific heat S dense natural stone, used as starting material for making stone flour, about 700 j/m3K, whereas for bitumen S ≈ 515 j/m3K. Specific heat retaining layer of material containing 72% by weight of a stone flour (corresponding to approximately 50% by volume),can be taken approximately equal to 610 j/m 3K. Consequently, the heat capacity of this layer of retaining material is almost 20% higher than the heat capacity of the layer of holding material of the same thickness, consisting only of bitumen. At the same time decreases and the cost of the material for the layer containing stone flour.

Higher heat capacity compared to stone, have, in particular, some metals, such as zinc (S=785 j/m3K), copper (S=995 j/m3K) and iron (S=1015-1080 j/m3K). Thanks to the very large heat capacity, and taking into account the cost, the iron can be considered as a filling for a layer of retaining material. This filler may be added to the bitumen in equal parts by volume, as mentioned above. For retaining layer containing 50% iron by volume, thermal conductivity will be S≈775 j/m3K.

As shown in figure 2, the pipe 2 of the refrigerant is not perfectly round, and flattened (tapered) cross-section, allowing the pipeline 2 refrigerant charge 1 adjacent to each other, at least approximately, by plane. This allows a technologically simple way to make heat transfer contact between the pipe 2 refrigerant and - 1. Layer 3 retaining material comes into the cavities 4, lying on both sides of the contact line between line 2 refrigerant and PLA is th 1. Massive layer 3 retaining material provides the best heat transfer between the card 1 and line 2 refrigerant, than would be possible under normal use of polyurethane foam as a holding material. Due to the flattened shape of the pipeline 2 refrigerant thickness of the layer 3 retaining material in the axils of 4 is less than it would be if all the pipeline 2. It is also conducive to efficient heat exchange between the Board 1 and line 2 refrigerant. Between layer 3 retaining material and the printed circuit Board 1 is a layer 5 of adhesive, which due to its significantly smaller thickness in comparison with the card 1 and the layer 3 retaining material shown in figure 2 only line.

Separate operations for manufacturing the invention of the evaporator is shown in figure 3-5.

On the first operation of the technological process is shown in figure 3, the package is created, representing the foot, the layers of which consist of a Board 1, line 2 refrigerant and plate 6 of a thickness of 1.2 mm of the bituminous composition. On the underside of the plate 6, facing to the circuit Board 1 and the pipe 2 refrigerant, is an adhesive layer 5. As the adhesive layer 5 when the cold plate has no gluing ability, plate 6 together with the layer 5 can pre-prepare, and treat her, not taking nicacio for 10 protect the adhesive layer during the period between the preparation and application of plate 6.

Shown in figure 3 the phase of manufacture of the evaporator pipe 2 refrigerant still not required to adhere to the circuit Board 1 along the entire length; slight waviness of the pipeline 2 refrigerant vertically relative to the surface of the Board 1, as shown in figure 3, is valid.

When depicted on figure 4 of the second operation, the manufacture of the evaporator to the surface of the plate 6 is pressed the stamp 7. At this stage plate 6 cold, and therefore hard; as a result, the pressure of the stamp 7 line 2 refrigerant is pressed against the circuit Board 1 along the entire length.

On the lower side of the stamp 7, addressed to the plate 6, there are channels 9, the arrangement of which corresponds to the course of the pipeline 2 refrigerant. Alternatively, the stamp 7 may also be manufactured from a synthetic elastomer, such as silicone, hardness, for example, 20 shore a, material thickness 20 mm With the stamp of synthetic elastomer with selected which will not cause damage to the piping of the refrigerant, shore hardness to put the channels on the underside of the stamp is not required.

As a result of subsequent heating of bitumen plate 6 becomes flowable, and the plate 6 in the gaps 8 between adjacent pipe sections 2 refrigerant is pressed against the circuit Board 1. The viscosity of the bitumen composition is selected so that it, on the one hand, rises was the flowable, in order to penetrate into the cavities 4 between the Board 1 and line 2 refrigerant, and on the other hand, remained sufficiently viscous to prevent the possible detachment of pipeline sections 2 refrigerant from the Board in some places.

So regardless of the yield strength of the bitumen composition to exclude the possibility of local delaminations line 2 refrigerant channels 9 of the stamp 7 may be equipped with a local (not shown in the drawing) projections, which when heated plate 6 is forced through it and directly in contact with the pipeline 2 refrigerant, pushing him to the Board 1.

The melting point of the hot-melt adhesive layer is selected so that it 5 was melted during the heating and molding plate 6, and then after cooling firmly connected hardened layer 3 retaining material with the card 1 and line 2 refrigerant. The lower side of the plate 6 may be covered with an adhesive layer 5 is completely or partially.

For sealing the open surface layer 3 retaining material it may be covered with a layer of varnish, in particular on the basis of shellac.

Removing the bituminous composition at the disposal of the evaporator is simple: when the deformation of the evaporator brittle in the cold layer 3 retaining material breaks up into pieces or by strong cooling of the evaporator, for example with OSU dry ice, breaks the connection between the layer 3 carrier material and the pipeline 2 refrigerant and - 1.

1. A heat exchanger for a refrigerator containing charge (1), which is in heat-conducting contact with the Board (1) pipeline (2) for the refrigerant and sealed with pipe (2) layer (3) retaining material, characterized in that the layer of holding material comprises bitumen composition with filler, and the filler has a heat capacity greater than the heat capacity of the bitumen.

2. The heat exchanger according to claim 1, characterized in that the pipe (2) for the refrigerant has a flattened cross-section.

3. The heat exchanger according to claim 1 or 2, characterized in that the layer (3) retaining material is connected to the card (1) an adhesive layer (5).

4. The heat exchanger according to claim 3, characterized in that the adhesive layer (5) consists of an adhesive that is activated by the high temperature.

5. The heat exchanger according to claim 1, characterized in that the content of the filler in bituminous composition is from 50 to 80 wt.%.

6. The heat exchanger according to claim 1, characterized in that the content of the filler in bituminous composition is from 25 to 65 vol.%.

7. The heat exchanger according to claim 1, characterized in that the filler used crushed stone.

8. The heat exchanger according to claim 1, characterized in that the filler used iron.

9. The heat exchanger according to claim 1, characterized in that on the contrary the opposite Board (1) side of the layer (3) retaining material is coated with the layer of varnish.

10. The heat exchanger according to claim 1, characterized in that the average thickness of the layer (3) retaining material ranges from 0.5 to 2 mm, and preferably from 1.0 to 1.5 mm.

11. A method of manufacturing a heat exchanger, in particular an evaporator or condenser, as claimed in any of the preceding paragraphs, including the following: form a stop, consisting of Board (1), pipe (2) for the refrigerant and the plate (6) of the bituminous composition, heat the plate (6) and pressed stop.

12. The method according to claim 11, characterized in that the card (1), pipe (2) and plate (6) of the bituminous composition is placed in the stack in that order.



 

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