Heat exchanger

FIELD: heating.

SUBSTANCE: heat exchanger comprises a package of heat exchanging plates (1, 1a, 1b, 1c) formed from metal sheet having a three dimensional pattern (2, 3), each plate (1, 1a, 1b, 1c) of the heat exchanger has a groove (10) in which a gasket (9) is located, and the said groove (10) has a bottom inner surface (11), and the said bottom inner surface (11) has at least one protrusion (14, 15) directed towards the said adjacent heat exchanging plate (1a). On the part of the said protrusion (14, 15), the said gasket (9) is compressed greater than on the part located outside of the said protrusion (14, 15).

EFFECT: minimising the risk of fluid leakage.

15 cl, 6 dwg

 

The present invention relates to a heat exchanger containing a package of heat exchanger plates are made of sheet metal, having a three-dimensional terrain, with each heat exchanger plate has a groove in the specified groove is laying, resting in the adjacent heat exchanger plate, and this groove has a bottom and a specified plate has at least one projection directed to the specified adjacent heat exchanger plate.

Such a heat exchanger is known from the document US 7490660 B2. The spacer has a recess corresponding in shape to the protrusion. From the side facing the adjacent heat transfer plate, the gasket has a ledge that is included in the recess formed on the bottom side of an adjacent heat exchanger plate. The recess has the form, return the form of a protrusion on the upper side of an adjacent heat exchanger plate.

The gap between the heat plate and the adjacent heat exchange plate forms a part of the primary flow passage or a portion of the secondary flow passage passing through the heat exchanger. The gasket seals the flow passage from the outside or plot holes supply and return heat exchanger plates from another channel flow.

To achieve good heat transfer from one flow passage to another plate is of Teploobmennik perform relatively thin. This causes the problem lies in the fact that the pressure of the fluid within the flow channel may deform the heat-exchange plate. This phenomenon particularly occurs in the area around the hole, forming a feed opening or refund the respective flow channels. In many cases in the areas of these holes, the connection between the heat transfer plate and the adjacent heat exchanger plate is not strong enough.

The decision, disclosed in patent document US 7490660 B2, allows you to hold the gasket in its place, that is, between the groove of the heat transfer plate and a recess adjacent heat exchanger plate. In addition, increasing the length of the seal as compared with the case where the recesses and the protrusions are missing. However, when the heat exchange plate is deformed under the action of pressure in one of the flow channels, there is still a risk of leakage, which can occur in isolation exchanger plates from the strip. In this case, between the recesses and the strip may be slit through which will leak.

The objective of the invention is to minimize the risk of leakage.

This problem is solved by the fact that the compression pads on the area specified protrusion greater the degree of compression on the area outside of the specified tab.

When the gasket is installed between two heat exchanger plates, that is, between the heat exchange plate and the adjacent heat exchanger plate, the gasket is slightly compressed so that it abuts the inner surface of the groove, for example the top or bottom, and the lower or upper side of the adjacent heat exchanger plate. However, the plot of the ledge specified protrusion is pressed into the gasket, compressing the gasket is stronger than at other sites. To achieve this, a stronger compression of the protrusion is pressed into the gasket with greater force than at other sites. Even in the case of deformation of the heat transfer plate or plates, which may lead to slight movement of the ledge, there is no loss of contact of the protrusion with the gasket. These elements form an additional protection against leakage of liquid medium. Due to the elasticity of the material forming the gasket, it will just follow the tab, thus forming a waterproof barrier. In addition, the tab will be set against the pad, pressing it into the adjacent heat exchanger plate even when significant deformation of the plates.

In a preferred variant of realization of the specified adjacent heat exchanger plate has a lower side facing to the specified heat transfer plate, and the specified lower side on the plot ledge is indicated adjacent heat transfer plate is formed a recess, when this gasket is deformed so that goes inside the specified deepening. In other words, the recess on the bottom side of an adjacent heat exchanger plate has a form that is "opposite" to the protrusion of the upper side of the heat transfer plate. When the two heat exchanger plates are superimposed on each other, the gasket is deformed not only by heat transfer plate, but also from the adjacent heat exchanger plate. In this area the gasket is pressed into the recess. Even when the adjacent heat exchanger plate is deformed, the elastic strip material can repeat the form of this deformation.

Preferably the specified protrusion has a height which constitutes at least 25% of the thickness of said strip. The protrusion is pressed in the specified gasket on a fairly large depth, so that even a serious strain will not cause leakage.

Preferably the specified protrusion has at least in the upper part of the triangular shape. The upper part of the triangle forms the edge. This edge should not be too sharp so as not to damage the gasket. However, this edge presses against the gasket on quite small area, which can be achieved considerable pressure.

In a preferred variant of realization of the specified protrusion has a triangular shape. In other words, istop whole has the shape of a triangle.

In a preferred variant of realization of the specified protrusion passes through a curved trajectory. The curve lies in a plane parallel to the plane of the heat transfer plate. This provides the additional advantage of increasing the strength of the heat exchange plates.

In a preferred variant of realization of the specified heat exchanger plate has at least one through hole, and the protrusion passes through the area of the groove, partially surrounding the specified pass-through hole. As mentioned above, in the area of the through-hole has the greatest risk of deformation of the heat transfer plates. In most cases, it helps to provide the protrusions only on this site but on other sites to leave the ordinary form of grooves.

Preferably this groove has at least one linear section running parallel to the edge of the specified heat transfer plate, and the specified protrusion ends outside of the specified line segment. Usually exchanger plates can be joined along their edges by welding or soldering, so that the risk of deformation of the plates, leading to leakage, in this area is quite small. Therefore, the shape of the grooves on the land along the edge can be simple.

Preferably this groove has side walls and the bottom Kahn is Cai between these side walls and the specified protrusion is flat. Flat plot of grooves may be used only for slight compression of the gasket. On this site there is only a small load on the gasket, so that the overlapping plates to each other can be done without much effort. However, a sufficiently long line sealing, additional to the specified padding.

In a preferred embodiment, the implementation in this groove is at least two tabs and the bottom of the indicated grooves between the protrusions is flat because similar to those mentioned above for the area between the lip and the side walls.

In a preferred embodiment, the implementation in this groove is at least one auxiliary protrusion, and the specified auxiliary protrusion intersects the specified groove perpendicularly to the ledge. It provides the possibility of additional strengthening plates in the direction perpendicular to the groove.

Preferably the specified protrusion is made by pressing a sheet metal heat transfer plate. Therefore, its formation is not required to use any additional material.

In another preferred embodiment, the implementation of the grooves are "aimed up the grooves, and the inner is poverhnosti form the upper part. The strip is based on this protruding section, which is the upper part of the protruding area of the lower heat transfer plate, and the lower portion has protrusions penetrating into deeper, forming a groove, thereby pressing the strip into the recess and deforming it as described above. This implementation option, of course, also applicable to any other of the above options for implementation.

Below with reference to the drawings in more detail described the preferred embodiment of the invention; in the drawings:

figure 1 shows a heat exchanger plate package of heat exchanger plates,

figure 2 schematically shows the form of the heat transfer plates at the site of the groove of the strip,

figure 3 shows an enlarged view of a fragment III 1,

figure 4 shows a variant implementation, the alternative implementation is illustrated in figure 3.

Figure 1 illustrates the heat exchanger plate 1. Heat exchanger plate has a concavity 2, at a predetermined height protruding above the plane of the plate 1. In addition, the heat exchange plate 1 has a recess 3, is recessed to a certain depth in this heat exchanger plate 1. Bumps 2 are shown as white circles, while the depressions 3 are shown as circles with a cross.

As is known from the prior art, when superimposed on each other, two such heat exchange is haunted plate 1 to form a pair of heat exchanger plates. Two adjacent plates are usually slightly different in shape, so that when they are superimposed on one another bulge 2 one plate is combined with the deepening of 3 adjacent plates, and so on.

Thus, within such pairs of plates formed flow channels. Usually a flow channel formed on one side of the heat exchanger plates 1, refers to the first flow channel and a flow channel formed on the opposite side, belongs to the second flow channel, hermetically isolated from the first flow channel.

Heat exchanger plate 1 is made of sheet metal. Sheet metal is a material having good thermal conductivity, and can be manufactured by molding or stamping. Also, instead of the sheet metal you can use plastic materials. Bumps 2 and the depressions 3 form a three-dimensional relief or profile. This profile receive by molding or stamping. However, the plate may have any other suitable profile, for example in the form of a "tree", which is well known from the prior art.

The considered heat exchanger plate 1 has four through holes 5-8. These through holes 5-8 are used for forming channels or connections with the first and second flow channels, respectively. For example, end-to-end otverstia, 7 form a hole supply and return for the first flow passage and the through holes 6, 8 form a hole supply and return for the second channel of the fluid.

In order to separate the two flow passage from each other, between the two heat exchanger plates entered the gasket 9. This is illustrated in figa, 2b. Figure 2 illustrates the three heat exchanger plates 1A, 1b, 1C. To simplify further explanations heat-exchange plate 1b is called the "heat plate" or "first heat-exchanging plate". Heat transfer plate 1A is called "adjacent heat exchange plate or the second heat exchanger plate".

Gasket 9 has such a shape that outside the area sealed by the gasket 9 is the first group of through holes 5, 7, and inside the sealed zone is the second group of through holes 6, 8, forming, thus, for example, the second flow channel. An appropriate spacer between the first heat exchanger plate 1b and the third heat-exchanging plate 1C is positioned in such a way that the openings 5, 7 hermetically sealed, and the holes 6, 8 is left free for external influence. Thus, it is possible to use the through-hole 5, 7 as the openings of the supply and return for the first flow passage and the through holes 6, 8 as from the Erste supply and return for the second flow channel.

The strip 9 is located inside the groove 10. For more information of this groove is illustrated in figure 2.

The groove 10 has an inner surface 11, in the present illustration being a bottom, and two side walls 12, 13. The two tabs 14, 15 of the groove 10 of the first heat transfer plate 1b is directed to the adjacent or second heat transfer plate 1A. On the opposite or bottom side of the first heat exchanger plate 1b has two recesses 16, 17 whose shape corresponds to the shape of the protrusions 14, 15, representing in this case a triangle. However, it is possible that only the tops of the protrusions are in the shape of a triangle.

When the two heat exchanger plates 1A, 1b are put against each other and the strip 9 is located in the groove 10 of the first heat transfer plate 1b, the strip 9 is deformed in the area of the projections 14, 15. This deformation leads to a compression of the gasket 9, which is on the site of the projections 14, 15 is stronger than at other sites. For this purpose, the tabs 14, 15 have a height providing a substantial deformation of the strip 9, comprising, for example, at least 10%, 25% of the thickness of the strip 9, or more preferably at least 20%, or even more preferably at least 25%.

The gasket 9 is deformed so that is included in the recesses 16, 17 on the lower side of the second heat transfer plate 1A.

Thus, Proclad who has a wavy form, with areas where it is more strongly compressed, and the land on which it is less strongly compressed.

Between the side walls 12, 13 and projections 14, 15 of the inner surface 11 of the groove 10 is flat. The bottom 11 of the groove 10 is flat and also between the tabs 14, 15. These flat areas (the lower side of the bottom 11 of the groove 10 is flat as these parts) gasket 9 is only slightly compressed, as is the case in the devices known from the prior art.

The result of the action of the projections 14, 15 are illustrated in fig.2b. Even in the event of deformation of the first heat transfer plate 1b under the action of pressure fluid medium between the heat exchanger plates 1A, 1b, gasket 9 ensures a reliable seal. Despite the deformation of the plate heat exchanger 1b, the protrusions 14, 15 all are within the strip 9. Due to the elasticity of the material forming the gasket, it just repeats the shape of the projections 14, 15, forming impermeable to fluid barrier. The tabs 14, 15 rest against the gasket 9, thereby pressing it to the second plate 1A of the heat exchanger even when significant deformation of the plate heat exchanger 1b.

Figure 3 on an enlarged scale illustrates the section III, shown in figure 1, without the strip 9. You can see that the tabs 14, 15 in the groove 10 are located only on the section of the groove 10, partially surrounding quotee hole 5. Therefore, the projections 14, 15 are held in a curved path, thereby increasing the strength of the heat transfer plate 1. The groove 10 has at least one linear section 18, 19 along the edges of the heat transfer plate 1. The tabs 14, 15 are located only on the site outside of the specified line of section 18, 19.

Figure 4 illustrates a few of the modified embodiment. Similar elements are denoted by the same number of items. In figure 4, the gasket is not shown.

In the groove 10 are auxiliary projections 20. These auxiliary projections 20 intersect the groove 10 perpendicular to the tabs 14, 15 and serve to increase the strength of the heat exchanger plate 1 in the perpendicular direction.

Figure 5 illustrates an alternative embodiment in which the grooves 10 are "facing up" holes in the walls 12, 13 forming the protruding section, and the inner surface 11 is the upper part. When the gasket 9 is based on this protruding portion 11, which is the peak of a prominent area of the lower heat transfer plate, and the bottom plot is the tabs 14, 15, reaching the recesses forming the grooves 10, thereby pressing the gasket 9 in the said recess and deforming it as described above.

Any variant of the implementation, shown in figure 1-4, also applies to the implementation variant, shown in figure 5.

1. A heat exchanger containing a package of heat exchanger plates (1, 1A, 1b, 1C), made of sheet metal having a three-dimensional relief (2, 3), each heat exchanger plate (1, 1A, 1b, 1C) has a groove (10), which is a gasket (9), resting in the adjacent heat exchanger plate (1A), and this groove (10) has a bottom (11) of the inner surface (11), with the specified bottom inner surface (11) has at least one projection (14, 15)directed to the specified adjacent heat transfer plate (1A), characterized in that at the area of the specified device (14, 15) compression specified strip (9) is larger than the area outside of the specified device (14, 15).

2. The heat exchanger according to claim 1, characterized in that the adjacent heat exchanger plate (1A) has a lower side facing to the specified heat transfer plate (1b), and the specified lower side plot device (14, 15) of the adjacent heat transfer plate (1A) is formed by a recess (16, 17), with the specified gasket (9) deformed so that goes inside the specified recesses (16, 17).

3. The heat exchanger according to claim 1, characterized in that the protrusion (14, 15) has a height which constitutes at least 10% of the thickness of said strip (9).

4. Those whom lopment according to claim 3, characterized in that the projections (14, 15) have a height which constitutes at least 15% or preferably at least 25% of the thickness of said strip (9).

5. The heat exchanger according to any one of claims 1 to 4, characterized in that the protrusion (14, 15) at least in its upper part has a triangular shape.

6. The heat exchanger according to claim 5, characterized in that the protrusion (14, 15) has a triangular shape.

7. The heat exchanger according to any one of claims 1 to 4, to 6, characterized in that the protrusion (14, 15) passes along a curved path.

8. The heat exchanger according to any one of claims 1 to 4, to 6, characterized in that the heat-exchange plate (1b) has at least one through hole (5-8) and the protrusion (14, 15) passes through the area of the groove (10), partially surrounding the specified pass-through hole (5-8).

9. The heat exchanger of claim 8, characterized in that the groove (10) has at least one linear section (18, 19)parallel to the edge (4) of the said heat transfer plate (1), and the specified device (14, 15) ends not reaching the specified line section (18, 19).

10. The heat exchanger according to any one of claims 1 to 4, 6, 9, characterized in that the groove (10) has side walls (12, 13) and the bottom inner surface (11) of the groove (10) between the said side walls (12, 13) and the specified device (14, 15) is p is Oskol.

11. The heat exchanger of claim 10, wherein in said groove (10) is at least two tabs (14, 15), and the bottom inner surface (11) of the said grooves between the protrusions (14, 15) is flat.

12. The heat exchanger according to any one of claims 1 to 4, 6, 9, 11, characterized in that in said groove (10) is at least one auxiliary protrusion (20), and the specified auxiliary protrusion (20) intersects the specified groove (10) perpendicularly to the ledge (14, 15).

13. The heat exchanger according to any one of claims 1 to 4, 6, 9, 11, characterized in that the protrusion (14, 15) are made by pressing a sheet metal heat transfer plate (1, 1A, 1b, 1C).

14. The heat exchanger according to any one of claims 1 to 4, 6, 9, 11, characterized in that the groove 10 is made in the form of recesses in the walls (12, 13) with the formation of the lower sections, with the inner surface (11) is the bottom.

15. The heat exchanger according to any one of claims 1 to 4, 6, 9, 11, characterized in that the grooves (10) are designed as recesses in the walls (12, 13) with the formation of the elevated sections, and the inner surface (11) is the apex.



 

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