Heat exchanger and its fabrication method

FIELD: heating.

SUBSTANCE: invention relates to the sphere of heating engineering immediately dealing with design of heat exchange elements; proposed is a heat exchanger to be utilised as the evaporator of a refrigerant apparatus such as a household refrigerator or freezer as well as a method for its fabrication. The heat exchanger is fabricated of a support plate, a profiled component manufactured of a thermal insulant and having a groove arranged on its surface and a tube for heat medium circulation that is specially shaped to match the groove path. The heat exchanger fabrication technique envisages the tube being fitted in the profiled component groove and the support plate attached to the profiled component surface the tube is positioned on.

EFFECT: fabrication of high quality heat exchangers even under relatively non-strict requirements to manufacture tolerances.

2 cl, 2 dwg

 

The technical field

The present invention relates to a heat exchanger, in particular an evaporator for refrigerating apparatus, such as a household refrigerator or freezer, as well as to its method of preparation.

The level of technology

From patent document DE 18826 A1 is known a heat exchanger consisting of a base plate, a tube for the refrigerant located in the form of a meander on a support plate, and bitumen insulation layer. Bituminous layer is first applied in the form of a plate on the design of the base plate and tube for the refrigerant, and then molded with a stamp, in which groove formed in the shape of a meander in accordance with the progress of the tube for the refrigerant on a support plate.

In the manufacture of the evaporator you need to carefully ensure that the tube for the refrigerant on a support plate located in exact accordance with the progress of the grooves of the stamp. If the tube will lie not in the middle of the groove, the thickness of the layer of bitumen on opposite sides of the tube is not uniform, or a layer of bitumen when applying on the support plate and the tube for the refrigerant is torn in some places. If the deviation from the proper position will be so great that the tube is out of the groove, when the pressing stamp will slyshitsja, and the evaporator will be spoiled.

The stroke of the stamp should be at least sufficient on the I, to the layer of bitumen in the area between the bends of the tube for the refrigerant came into contact with the support plate. If the move will more than certainly need to do this, the bitumen will be fast at all in the sinus between elliptical in cross-section of the pipeline and the support plate. Therefore, the known method is unsuitable if, instead of bitumen plates will need to reformulate plate of high-performance insulating material, as penetration of such material in the sinuses will impair heat transfer between the tube with refrigerant and support plate, and therefore, will reduce the efficiency of the evaporator.

Disclosure of inventions

The task of the invention is to provide a method of manufacturing a heat exchanger, which will allow to produce high-quality heat exchanger even at low requirements to the manufacturing tolerances, and to provide a heat exchanger which can be manufactured by this method.

This problem is solved according to the invention that the fitting of insulation material is manufactured with pre-positioned on its surface a groove in which is placed the tube, before the surface is pinned base plate. Even if the angle of curvature of the individual curves of the tube will be slightly deviate from the corresponding corner of the curves is Anaki, the tube can be all the same with slight elastic bending easily be laid in the groove. This will eliminate the possibility of flattening of the tube between the fitting and the supporting plate.

Preferably the thickness of the tube in a perpendicular direction to the surface of the fittings are initially more depth formed therein grooves, so that the tube, even when she lies at the bottom of the groove, is a little out of it. If you now press fitting and the support plate to each other so that at least part of the surface fittings come in contact with the support plate, the tube is squeezed between the support plate and the fitting, resulting in the desired manner will improve the heat transfer between the plate and the tube.

Fitting is easy and economical to manufacture by means of expansion of the plastic material into the shaped tool. Especially suitable for expansion, polystyrene and polyurethane.

To obtain a good insulation effect, it is desirable that the material was porous, and at the same time have sufficient hardness to collapse the tube for the refrigerant. In the manufacture of shaped parts made of polystyrene suitable density of 30-50 g/DM3and preferably 40 g/DM3.

Fitting and base plate pre is respectfully stick together, in particular incorporate adhesive film. This adhesive film is preferably applied to the fitting, as when applying an adhesive film on the base plate would be left free from adhesive where the tube for the refrigerant comes to the support plate, so as not to impair the heat transfer between the tube and support plate.

A short list of drawings

Other characteristics and advantages of the invention ensue from the following description of example with reference to the accompanying drawings. The drawings show:

Figure 1 is a perspective representation of the components proposed in the invention of the evaporator prior to their Assembly.

Figure 2 - proposed invention the evaporator in the finally assembled in the section.

The implementation of the invention

Figure 1 is a base plate of the evaporator of aluminum are marked with 1, tube for refrigerant figure 2, and fitting EPS figure 3. Tube 2 to the refrigerant has a branch pipe 4, through which the evaporated refrigerant exits the tube 2 into the suction pipe, intended for connection to the intake of the compressor, and passing within a pipe of the suction pipe capillary 5, designed for the supply of liquid refrigerant from the condenser. The free end of the capillary 5 is clamped in the gap 6 of the tube 2 to the refrigerant. Here PI is agent flows through curved in the shape of a meander tube 2 to the connection 7, through which it flows in the pipe 4 of the suction pipe.

Fitting 3 is a plate made of polystyrene on the surface 8 which is formed by the groove 9, the process which follows the shape of the tube 2 to the refrigerant. The depth of the groove 9 is slightly less than the diameter of the tube 2 to the refrigerant, which has yet to connect the individual components 1, 2, 3 round cross-section. The density of polystyrene is 40 g/DM3. On the surface 8 of the fitting 3 applied quick-setting glue.

When assembling the first evaporator into the groove 9 of the fitting 3 is nested tube 2 to the refrigerant. Imposed on the fitting 3 and the tube 2 for refrigerant base plate 1 first contact only with the tube 2 to the refrigerant. Created so the combination is compressed between two dies (not shown) of the press. The hardness of the material of the fitting 3 and the wall thickness of the tube 2 to the refrigerant chosen so that plastic deformation occurs in the cross-section of the tube, before the surface 8 in contact with the support plate 1. Thus, the penetration of the material of the fitting 3 into the cavities 11 between the tube 2 to the refrigerant and the support plate 1 in the depicted example, is excluded. However, the density of the foam, which made fitting 3 can be chosen such that the Azuchi 11 were also filled with the material of the fitting 3.

After the movement of the press shall be terminated, in whole residual elastic deformation of the tube 2 to the refrigerant remains, so that the tube will be under pressure between the base plate 1 and the fitting 3, while the adhesive layer between the surface 8 and the base plate 1 will act tensile stress. In the aging process of the evaporator, these elastic stresses may weaken due to progressive shrinkage plots 10.

Before gluing the base plate 1 with the fitting 3 or after the bonding in the groove 13 extending from the edges of the fittings 3 between the two parallel sections of the grooves 9, you can insert the temperature sensor 12 for monitoring the temperature of the evaporator.

In another embodiment of the invention the carrier plate 1 and the fitting 3 are fastened to each other not via the applied adhesive, and the adhesive film. This adhesive film is applied to the surface 8 of the fitting 3 to the laying tube 2 to the refrigerant in the groove 9. The tube is then 2 for the refrigerant is superimposed on the adhesive film on the groove 9 and is pressed into the groove 9 and an adhesive film depending on the characteristics of the material may tear or stretch out along the groove 9. As in the above embodiment, there is a flattening of the tube 2 to the refrigerant and the bonding base plate 1 with f the dreamy item 3 during the same operation.

1. A method of manufacturing a heat exchanger, comprising the following operations:

a) prepare the support plate (1), fitting (3) of insulating material, having a surface (8) is located on this surface (8) of the groove (9) and formed in accordance with the progress of the grooves (9) tube (2) for the coolant,

b) put the tube (2) into the groove (9),

c) fix the support plate (1) on the surface (8).

2. The method according to claim 1, characterized in that the thickness of the tube (2) in the direction perpendicular to the surface (8), greater than the depth of the grooves (9), and that the tube (2) tapers between the base plate (1) and the fitting (3), while at least part of the surface (8) is in contact with the support plate (1).

3. The method according to claim 1 or 2, characterized in that the molded part (3) made of plastic material by means of expansion.

4. The method according to claim 3, characterized in that the plastic material is polystyrene.

5. The method according to claim 4, characterized in that the polystyrene expandyour to the density of 30-50 g/DM3.

6. The method according to one of claims 1 and 2, 4 and 5, characterized in that the fixation is made by gluing.

7. The method according to claim 6, characterized in that the surface (8) of the fitting (3) before compression is applied to the adhesive film.

8. The heat exchanger support plate (1), Zack is altnoy on the plate (1) fitting (3) of insulating material, in which on the surface (8)facing the base plate (1)formed groove (9)in which is placed the tube (2) for the coolant, characterized in that the groove (9) on fittings (3) pre-molded, and the tube (2) is inserted into the groove (9).

9. The heat exchanger of claim 8, characterized in that the tube (2)at least partially tapered and adjacent to the tapered surface of the backing plate (1).

10. The heat exchanger according to claim 9, characterized in that the tube (2) is surrounded by insulating material fitting (3) to the tapered part.

11. The heat exchanger according to one of PP-10, characterized in that the tube (2) is compressed between the support plate (1) and the fitting (3) in the direction of the depth of the groove (9).

12. The heat exchanger of claim 8 or 10, characterized in that the shaped part is made of expanded plastic material.

13. Heat exchanger according to item 12, characterized in that the extruded plastic material sealed at a bottom of the groove (9).

14. Heat exchanger according to item 12, wherein the plastic material is polystyrene.

15. The heat exchanger 14, characterized in that the expanded polystyrene has a density of from 30 to 50 g/DM3.

16. The heat exchanger according to one of PP-10, 13-15, characterized in that the supporting plate (1) glued on the fitting (3).

17. Heat exchanger according to clause 16, the best of the present, however, between the support plate (1) and the fitting (3) there is an adhesive film.

18. The heat exchanger according to one of PP-10, 13-15, 17, characterized in that the surface (8) of the fitting (3) is formed by a groove (13) for the temperature sensor (12).



 

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