CN115950292A - Double-wall type heat exchanger plate and manufacturing method thereof - Google Patents
Double-wall type heat exchanger plate and manufacturing method thereof Download PDFInfo
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- CN115950292A CN115950292A CN202211519120.3A CN202211519120A CN115950292A CN 115950292 A CN115950292 A CN 115950292A CN 202211519120 A CN202211519120 A CN 202211519120A CN 115950292 A CN115950292 A CN 115950292A
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Abstract
The invention relates to the technical field of plate heat exchangers, in particular to a double-wall heat exchanger plate and a manufacturing method thereof. The heat exchanger plate comprises a plate body consisting of a plate A and a plate B, wherein a through hole for fluid to pass through the plate body is formed in the plate body, an annular brazing strip is arranged around the through hole, a filling layer tightly attached to the plate A and the plate B is filled between the plate A and the plate B, the plate A and the plate B are made of stainless steel, the filling layer is made of tin, and the heat exchanger plate is manufactured through the working procedures of stamping forming, brazing, tin immersion and the like. The heat exchanger plate has higher heat exchange efficiency.
Description
Technical Field
The invention relates to the technical field of plate heat exchangers, in particular to a double-wall heat exchanger plate and a manufacturing method thereof.
Background
The double-wall plate heat exchanger is a heat exchanger capable of preventing heat exchange medium from contacting to produce reaction or mutual pollution after the heat exchange plate of the heat exchanger leaks, the plate sheet is composed of two plate sheets A and B which are tightly attached together, even if one of the plate sheets A and B has cracks or perforations, the fluid flowing at two sides of the plate sheet can not be mixed together in the plate heat exchanger, under the condition, the fluid leaking through the cracks or perforations enters the gap between the plate sheet A and the plate sheet B and finally flows to the edge of the plate sheet A and the plate sheet B, so that the leakage can be taken measures.
Patent No. US4976313 describes a double wall construction for a plate heat exchanger, where alternate plates 6 and intermediate plates 5 constituting the double wall unit are pressed against each other by plastic metal deformation of the plates, so that the ridges of the corrugations of the front surface of one plate will fall into the corresponding valleys of the corrugations of the opposite back surface of the adjacent plate, and vice versa, thereby establishing surface-to-surface contact between the plates, and thus improving the heat exchange efficiency between alternate plates 6 and intermediate plates 5, so that a plate heat exchanger employing such a double wall unit has a higher heat exchange efficiency. However, when the alternate plates 6 and the intermediate plates 5 are made of stainless steel, although they are easily bent, their plastic deformability is not so good, and the bonding rate cannot be further improved due to limitations of surface roughness (the surface is uneven in a small scale, and when the convex portions of the alternate plates 6 and the intermediate plates come into contact with each other, the contact of the concave portions is prevented) and practical conditions.
Disclosure of Invention
The invention aims to solve the technical problem and provides a double-wall type heat exchanger plate and a manufacturing method thereof aiming at the technical defects.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a double-wall type heat exchanger plate comprises a plate body consisting of a plate A and a plate B, wherein a through hole for allowing fluid to pass through the plate body is formed in the plate body, an annular brazing strip is arranged around the through hole, a filling layer tightly attached to the plate A and the plate B is filled between the plate A and the plate B, the plate A and the plate B are made of stainless steel, and the filling layer is made of tin.
Further optimizing the technical scheme, one of the plate A and the plate B is provided with a nickel layer on the inner side, the filling layer is brazed with the nickel layer, and the filling layer is not brazed with the plate A and the plate B which are not provided with the nickel layer.
Further optimizing the technical scheme, the inner side surfaces of the plate A and the plate B are both provided with nickel layers which are in a narrow strip shape, the nickel layers on the plate A are partially overlapped with the nickel layers on the plate B, and the parts of the filling layers which are not brazed with the nickel layers are communicated with the outside.
The manufacturing method of the double-wall type heat exchanger plate comprises the following steps:
the first step is as follows: punching and forming the plate A and the plate B;
the second step: overlapping the plate A and the plate B obtained in the first step together for brazing, and forming an annular brazing belt around the through hole to obtain a plate body;
the third step: and filling molten tin into a gap between the plate A and the plate B of the plate body obtained in the second step, and cooling to solidify the molten tin into a filling layer to obtain the double-wall heat exchanger plate.
Further optimizing the technical scheme, when the plate A and the plate B are provided with nickel layers, the nickel layers are plated on the plate A and the plate B after the plate A and the plate B are pressed and formed, or the nickel layers are plated on stainless steel for pressing the plate A and the plate B.
Compared with the prior art, the invention has the following advantages: 1. a filling layer which is tightly attached to the plate A and the plate B is filled between the plate A and the plate B, and the filling layer is filled between the plate A and the plate B when tin is liquid, so that the fluidity is very good, most gaps can be filled, the filling layer is very good in contact with the plate A and the plate B, and the heat exchange efficiency is higher; 2. one of the plate A and the plate B is provided with a nickel layer on the inner side, and the filling layer can be combined with the nickel layer, so that the heat exchange efficiency between the plate A and the plate B is further improved, and leaked fluid can flow out from the space between the side without the nickel layer and the filling layer; 3. narrow strip nickel layer on slab A staggers each other and the edge part overlaps with narrow strip nickel layer on slab B, and the filling layer of overlap department combines simultaneously with slab A and slab B of this department for the gap appears more to be difficult to between slab A and the slab B under the effect of other factors, can avoid to a certain extent because of the heat exchange efficiency decline that the gap leads to appears between the two.
Drawings
Fig. 1 is a front view of a plate in example 1.
Fig. 2 is a top view of the plate in example 1.
FIG. 3 is a schematic view of the structure of example 2 in which a nickel layer is plated on a plate A.
Fig. 4 is a schematic structural view of example 2 in which a nickel layer is plated on a sheet B.
Fig. 5 is a front view of the plate in example 3.
In the figure: 1. a plate sheet A; 2. a plate sheet B; 3. a filling layer; 4. and a through hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the accompanying drawings in combination with the embodiments. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Example 1
A double-wall type heat exchanger plate is shown in figures 1-2 and comprises a plate body formed by a plate A1 and a plate B2, wherein through holes 4 for fluid to pass through the plate body are formed in the plate body, annular brazing belts are arranged around the through holes 4, the common plate body is rectangular, and the through holes 4 are formed in four corners of the common plate body. The middle part of the plate body is also provided with corrugated patterns or ridges and valleys, and the plate body is also provided with grooves or planes for placing sealing rings. The filling layer 3 is filled between the plate A1 and the plate B2 and is tightly attached to the plate A1 and the plate B2, the plate A1 and the plate B2 are made of stainless steel and are generally 304 or 316 in mark, the filling layer 3 is made of tin, and the filling layer 3 is not combined with the plate A1 and the plate B2.
The manufacturing method of the double-wall type heat exchanger plate comprises the following steps:
the first step is as follows: the plate A1 and the plate B2 are formed by punching, and the same punching method as the patent mentioned in the background art can be used;
the second step is that: overlapping the plate A1 and the plate B2 obtained in the first step together for brazing, cleaning the surfaces of the plate A and the plate B before brazing, brazing by using a copper-based brazing material and a vacuum brazing process, and forming an annular brazing strip around the through hole to obtain a plate body, wherein the obtained plate body is basically the same as a double-wall unit mentioned in the background art;
the third step: and filling molten tin into a gap between the plate A1 and the plate B2 of the plate body obtained in the second step, and then cooling to solidify the molten tin into a filling layer 3 to obtain the double-wall type heat exchanger plate. And after solidification is finished, removing residual tin on the surface of the plate body. Since tin is not bonded to stainless steel, it is also understood that the two are not bonded or brazed, the filler layer 3 is not bonded to the plate A1 and the plate B2, and when a hole is formed in the plate A1 or the plate B2, fluid can flow out along the filler layer 3 and between them, so that a leak can be detected.
Because tin is filled between the plate A1 and the plate B2 when being liquid, the liquid is very good in fluidity, most gaps can be filled, so that the filling layer 3 is very good in contact with the plate A1 and the plate B2, and the heat exchange efficiency is higher.
Example 2
As shown in fig. 3 to 4, in this embodiment, based on embodiment 1, one of the plate A1 and the plate B2 is provided with a nickel layer on its inner side, the inner side of the plate A1 is the side thereof close to the plate B2, the inner side of the plate B2 is the side thereof close to the plate A1, and the filler layer 3 is brazed or bonded to the nickel layer, because tin can be bonded to the nickel layer. The line thickened in fig. 3 is the bonding surface of the tin layer and the nickel layer, and the nickel layer is bonded with the lower side surface of the plate A1, so that the heat exchange efficiency between the filling layer 3 and the plate A1 is higher than that in the embodiment 1. The line bold in fig. 4 is located on the upper side of the plate B2, and the heat exchange efficiency between the packing layer 3 and the plate B2 is higher than that in example 1. The filler layer 3 is not brazed or joined to the plate A1 and the plate B2, which are not provided with a nickel layer, and the heat exchange efficiency between the filler layer 3 and them is the same as in example 1. The heat exchange efficiency between the plate A1 and the plate B2 is therefore greater than that in example 1.
The manufacturing method of the double-wall type heat exchanger plate in the embodiment comprises the following steps:
the first step is as follows: the plate A1 and the plate B2 are formed by punching, and the same punching method as the patent mentioned in the background art can be used;
the second step is that: plating a nickel layer (not plated around the through hole 4) on the inner side surface of one of the plate A1 and the plate B2 obtained in the first step, wherein the nickel layer is preferably 0.01-0.02 mm thick;
the third step: overlapping the plate A1 and the plate B2 obtained in the second step together for brazing, cleaning the surfaces of the plate A and the plate B before brazing, brazing by using a copper-based brazing material and a vacuum brazing process, and forming an annular brazing strip around the through hole to obtain a plate body, wherein the obtained plate body is basically the same as the double-wall unit mentioned in the background technology;
the fourth step: and filling a molten tin into a gap between the plate A1 and the plate B2 of the plate body obtained in the third step, and then cooling to solidify the molten tin into a filling layer 3 to obtain the double-wall heat exchanger plate. The plate body can be vertically and slowly immersed in a tin liquid pool, after the plate body is immersed for a period of time, the plate body can be immersed for 1-2 hours at the temperature of 250-280 ℃, then the plate body is taken out in a horizontal posture, then the tin liquid in the plate body is solidified in a sequential solidification mode, and the plate body can be gradually cooled from one end to the other end (the plate body can be cooled by adopting a water spraying method) and solidified. And after solidification is finished, removing residual tin on the surface of the plate body. The filler layer 3 will be tightly bonded or bonded to the sheet A1 or the sheet B2 provided with the nickel layer, and not to the sheet A1 and the sheet B2 not provided with the nickel layer.
When a crack or a hole occurs in the plate A1 provided with the nickel layer, the nickel layer and the filling layer 3 at the crack or the hole are also damaged, and fluid can flow out along the space between the filling layer 3 and the plate B2 so that leakage can be found. When a crack or hole occurs in the sheet B2 provided with the nickel layer, fluid can flow out along between the pack 3 and the sheet A1 so that a leak can be detected.
In the manufacturing process of the double-wall heat exchanger plate in the embodiment, a nickel layer may be plated on one side of the stainless steel plate used for punching the plate A1 or the plate B2, and then the filling layer 3 may be manufactured by punching and brazing.
Example 3
As shown in fig. 5, in this embodiment, on the basis of embodiment 1, the nickel layer is provided on the inner side surfaces of both the plate A1 and the plate B2, the nickel layer is in a narrow strip shape, the nickel layer on the plate A1 and the nickel layer on the plate B2 are staggered from each other, and the edges of the nickel layer are partially overlapped, and the filler layer 3 at the overlapped position is simultaneously bonded or adhered to the plate A1 and the plate B2 at the overlapped position (thickened positions of the upper edge and the lower edge of the filler layer 3 in the drawing), so that a gap is less likely to occur between the plate A1 and the plate B2 under the action of other factors, and a decrease in heat exchange rate due to the occurrence of the gap between the two is avoided to some extent.
The method of making the double-walled heat exchanger plate in this example is essentially the same as in example 2, except that the inner faces of plate A1 and plate B2 are plated with a strip-shaped nickel layer.
Claims (6)
1. A double-walled heat exchanger slab, includes the plate body of constituteing by slab A (1) and slab B (2), be provided with on the plate body and be used for fluid to pass through-hole (4) of plate body, be provided with annular brazing area around through-hole (4), its characterized in that: a filling layer (3) which is tightly attached to the plate A (1) and the plate B (2) is filled between the plate A (1) and the plate B (2), the plate A (1) and the plate B (2) are made of stainless steel, and the filling layer (3) is made of tin.
2. A double-walled heat exchanger plate according to claim 1, wherein: one of the plate A (1) and the plate B (2) is provided with a nickel layer on the inner side, the filling layer (3) is brazed with the nickel layer, and the filling layer (3) is not brazed with the plate A (1) and the plate B (2) which are not provided with the nickel layer.
3. A double-walled heat exchanger plate according to claim 1, wherein: the inner side surfaces of the plate A (1) and the plate B (2) are both provided with nickel layers which are in a narrow strip shape, the nickel layers on the plate A (1) are partially overlapped with the nickel layers on the plate B (2), and the part of the filling layer (3) which is not brazed with the nickel layers is communicated with the outside.
4. A method of making a double-walled heat exchanger plate according to claim 1, comprising the steps of:
the first step is as follows: stamping and forming the plate A (1) and the plate B (2);
the second step: overlapping the plate A (1) and the plate B (2) obtained in the first step together for brazing, and forming an annular brazing strip around the through hole (4) to obtain a plate body;
the third step: and filling molten tin into a gap between the plate A (1) and the plate B (2) of the plate body obtained in the second step, and then cooling to solidify the molten tin into a filling layer (3) to obtain the double-wall heat exchanger plate.
5. A method of manufacturing a double-walled heat exchanger plate according to any of claims 2-3, characterized by the steps of:
the first step is as follows: stamping and forming the plate A (1) and the plate B (2);
the second step is that: plating a nickel layer on the inner side of one or both of the plate A (1) and the plate B (2) obtained in the first step;
the third step: overlapping the plate A (1) and the plate B (2) obtained in the second step together for brazing, and forming an annular brazing belt around the through hole (4) to obtain a plate body;
the fourth step: and filling a molten tin into a gap between the plate A (1) and the plate B (2) of the plate body obtained in the third step, and then cooling to solidify the molten tin into a filling layer (3) to obtain the double-wall heat exchanger plate.
6. A method of manufacturing a double-walled heat exchanger plate according to any of claims 2-3, characterized by the steps of:
the first step is as follows: plating a nickel layer on one side of the stainless steel plate for punching the sheet A (1) and/or the sheet B (2);
the second step is that: stamping the stainless steel plate obtained in the first step into a plate A (1) and a plate B (2);
the third step: overlapping the sides, provided with the nickel layers, of the plate A (1) and the plate B (2) obtained in the second step inwards, and brazing, and forming an annular brazing belt around the through hole (4) to obtain a plate body;
the fourth step: and filling a molten tin into a gap between the plate A (1) and the plate B (2) of the plate body obtained in the third step, and then cooling to solidify the molten tin into a filling layer (3) to obtain the double-wall heat exchanger plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211519120.3A CN115950292A (en) | 2022-11-30 | 2022-11-30 | Double-wall type heat exchanger plate and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211519120.3A CN115950292A (en) | 2022-11-30 | 2022-11-30 | Double-wall type heat exchanger plate and manufacturing method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115950292A true CN115950292A (en) | 2023-04-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211519120.3A Pending CN115950292A (en) | 2022-11-30 | 2022-11-30 | Double-wall type heat exchanger plate and manufacturing method thereof |
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| CN (1) | CN115950292A (en) |
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- 2022-11-30 CN CN202211519120.3A patent/CN115950292A/en active Pending
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