CN114888423A - Manufacturing method of plate-fin heat exchanger based on diffusion welding - Google Patents
Manufacturing method of plate-fin heat exchanger based on diffusion welding Download PDFInfo
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- CN114888423A CN114888423A CN202210812732.5A CN202210812732A CN114888423A CN 114888423 A CN114888423 A CN 114888423A CN 202210812732 A CN202210812732 A CN 202210812732A CN 114888423 A CN114888423 A CN 114888423A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
- B23K20/023—Thermo-compression bonding
- B23K20/026—Thermo-compression bonding with diffusion of soldering material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
- F28F9/262—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators for radiators
- F28F9/268—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators for radiators by permanent joints, e.g. by welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/14—Heat exchangers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to the technical field of heat exchange equipment, in particular to a manufacturing method of a plate-fin heat exchanger based on diffusion welding, which comprises the following steps: the manufacturing method comprises the following steps that partition plates and fin plates are arranged in a stacking and interval mode, a plurality of fin plates are arranged between every two adjacent partition plates in an interval mode, and first welding areas at two opposite ends of each fin plate are respectively welded with second welding areas of the two adjacent partition plates; two separators respectively extending outward in the stacking direction; according to the technical scheme, the first welding area and the second welding area are arranged on the fin plates, and in the process of stretching the partition plates, the parts except the fin plate welding area are perpendicular to the partition plates from being attached to the partition plates, so that the cavity channel is formed, the problem that the fin plates are damaged or even broken when the fin plates are directly and rigidly pulled is avoided, and the rejection rate of processed plate bundles is reduced.
Description
Technical Field
The invention relates to the technical field of heat exchange equipment, in particular to a manufacturing method of a plate-fin heat exchanger based on diffusion welding.
Background
Plate-fin heat exchangers typically comprise: partitions, fins, seals, and the like. And a fin and a seal are arranged between two adjacent partition plates to form an interlayer to form a channel. The above-mentioned sandwich layers are overlapped according to the flowing direction of fluid, and welded into one body so as to form the plate bundle. The plate bundle is the core of the plate-fin heat exchanger. The plate-fin heat exchanger has the advantages of small volume, light weight, capability of treating more than two fluid media and the like. At present, the plate-fin heat exchanger is widely applied to the industries of petroleum, chemical engineering, natural gas processing and the like.
The prior art discloses a plate bundle processing method of a plate-fin heat exchanger, which comprises the following steps: coating, namely coating a solder resist on non-welding areas of the top surface and the bottom surface of the fin plate; stacking, namely sequentially stacking the fin plate and the partition plates to enable the partition plates to cover the top surface and the bottom surface of the fin plate; diffusion welding, namely connecting the stacked combination in a diffusion welding mode; and (4) stretching, namely respectively applying tension to the upper surface and the lower surface of the combined body connected in a diffusion welding mode to stretch the fin plate into the fin.
However, the above-mentioned stretching method by applying a pulling force to the upper and lower surfaces, respectively, belongs to the operation of hard stretching, and the metal is subjected to plastic deformation to form a flow channel; due to the limited ductility of the metal, a particularly high tensile force is required during the drawing process, and the metal is easily broken, so that the rejection rate of the processed plate bundle is relatively high.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect of high rejection rate caused by easy snapping during the stretching of the plate bundle in the prior art, and based on the above situation, it is necessary to develop a plate bundle manufacturing method of a plate-fin heat exchanger with low rejection rate during the processing of the plate bundle.
In order to achieve the above object, the present invention provides a method for manufacturing a plate-fin heat exchanger based on diffusion welding, comprising:
the manufacturing method comprises the following steps that partition plates and fin plates are arranged in a stacking and interval mode, a plurality of fin plates are arranged between every two adjacent partition plates in an interval mode, and first welding areas at two opposite ends of each fin plate are respectively welded with second welding areas of every two adjacent partition plates;
two separators respectively extending outward in the stacking direction; and simultaneously, respectively stretching two adjacent partition plates welded with the fin plates outwards along the arrangement direction of the fin plates to form a plate bundle with a cavity channel.
Optionally, a plurality of parallel strip-shaped grooves are formed in the fin plate, the partition plates are respectively overlapped on two sides of the fin plate, and two end portions of the strip-shaped grooves are exposed; and cutting off the exposed part of the fin plate along the edge line of the partition plate to form a plurality of fin plates distributed at intervals.
Optionally, a first non-welding area and a first welding area are respectively arranged on two sides of the strip-shaped groove on the first surface of the fin plate, and a first welding area and a first non-welding area are respectively arranged on two sides of the corresponding strip-shaped groove on the second surface of the fin plate;
arranging a first welding area on the side edge of a first non-welding area, which is arranged on the first surface and the second surface of the fin plate and is close to the strip-shaped groove on the edge; arranging a first non-welding area on the side edge of a first welding area which is arranged on the first surface and the second surface of the fin plate and close to the strip-shaped groove on the edge;
and a second non-welding area and a second welding area corresponding to the first non-welding area on the fin plate and a second welding area corresponding to the first welding area on the fin plate are respectively arranged on one surface, attached to the fin plate, of the partition plate.
Optionally, solder resist is applied to the first non-soldering area and/or the second non-soldering area.
Optionally, the plate bundle is formed by sequentially stacking a plurality of layers of fin plates and separators, and the outermost layer is a separator.
Optionally, the stacked fin plates and separator plates are diffusion welded.
Optionally, the arrangement directions of the strip-shaped grooves on the fin plates are the same.
Optionally, the arrangement direction of the strip-shaped grooves on at least one fin plate is arranged at an angle with the arrangement direction of the strip-shaped grooves on the other fin plates.
Optionally, the angle is 90 degrees.
Optionally, the fin plate is stretched in different directions twice according to different arrangement directions of the strip-shaped grooves.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. the invention provides a manufacturing method of a plate-fin heat exchanger based on diffusion welding, which comprises the following steps: the manufacturing method comprises the following steps that partition plates and fin plates are arranged in a stacking and interval mode, a plurality of fin plates are arranged between every two adjacent partition plates in an interval mode, and first welding areas at two opposite ends of each fin plate are respectively welded with second welding areas of every two adjacent partition plates; two separators respectively extending outward in the stacking direction; according to the technical scheme, the first welding area and the second welding area are arranged on the fin plates, and in the process of stretching the partition plates, the parts except the fin plate welding area are perpendicular to the partition plates from being attached to the partition plates, so that the cavity channel is formed, the problem that the fin plates are damaged or even broken when the fin plates are directly and rigidly pulled is avoided, and the rejection rate of processed plate bundles is reduced.
2. The fin plate is provided with a plurality of parallel strip-shaped grooves, the partition plates are respectively superposed on two sides of the fin plate, and two end parts of the strip-shaped grooves are exposed; cutting off the exposed part of the fin plate along the edge line of the partition plate to form a plurality of fin plates distributed at intervals; this application adopts above-mentioned technical scheme, through set up the bar groove on the fin board, cuts off the both ends in bar groove again, can obtain a plurality of fin boards with the baffle is range upon range of in convenient and fast ground.
3. The invention is characterized in that a first non-welding area and a first welding area are respectively arranged on two sides of a strip-shaped groove on a first surface of a fin plate, and a first welding area and a first non-welding area are respectively arranged on two sides of a corresponding strip-shaped groove on a second surface of the fin plate; arranging a first welding area on the side edge of a first non-welding area, which is arranged on the first surface and the second surface of the fin plate and is close to the strip-shaped groove on the edge; arranging a first non-welding area on the side edge of a first welding area which is arranged on the first surface and the second surface of the fin plate and close to the strip-shaped groove on the edge; a second non-welding area and a second welding area corresponding to the first non-welding area on the fin plate and a second welding area corresponding to the first welding area on the fin plate are respectively arranged on one surface, attached to the fin plate, of the partition plate; this application technical scheme sets up the weld zone of dislocation through the two sides at the fin board, and corresponds the weld zone of fin board and set up the weld zone of baffle, provides suitable welding area and non-welding area for tensile baffle formation cavity passageway.
4. Coating a solder resist on the first non-welding area and/or the second non-welding area; by adopting the technical scheme, the partition plate and the fin plate are prevented from being connected in the non-welding area, and favorable conditions are created for forming the side wall of the cavity channel.
5. The plate bundle is formed by sequentially stacking a plurality of layers of fin plates and partition plates, and the outermost layer is the partition plate; this application adopts above-mentioned technical scheme, can form multilayer cavity passageway, increases the circulation.
6. The invention carries out diffusion welding on the laminated fin plates and the partition plates; by adopting the technical scheme, through diffusion welding, brazing filler metal is not needed, the influence of the brazing filler metal is avoided, the base metal and the base metal are completely combined by atomic diffusion at high temperature and high pressure, different corrosion-resistant materials can be selected according to the corrosion-resistant requirement, and the corrosion-resistant requirement and the pressure-bearing capacity of the heat exchanger are met; the fin plates and the partition plates are stacked, so that the overall height is the lowest, when the vacuum diffusion furnace is placed for welding, the space of the vacuum diffusion furnace is saved, and the utilization rate of the vacuum diffusion furnace is improved.
7. The arrangement directions of the strip-shaped grooves on the fin plate are the same; the direction that this application specifically limited the bar groove is the same, can form the multilayer cavity passageway that the flow direction is parallel.
8. The arrangement direction of the strip-shaped groove on at least one fin plate and the arrangement direction of the strip-shaped grooves on the other fin plates are arranged at an angle; this application adopts above-mentioned technical scheme, can be so that the flow direction on cavity channel layer is certain angle setting to the fluid of the different flow directions of circulation.
9. The angle is 90 degrees; this application adopts above-mentioned technical scheme, can make cavity channel layer vertical setting to two flowings of circulation flow direction vertically fluid.
10. According to the invention, the fin plate is stretched in different directions twice according to different setting directions of the strip-shaped grooves; this application adopts above-mentioned technical scheme, through the first cavity passageway that stretches formation first flow direction for the first time, through the second time stretch formation second flow direction's cavity passageway, form the multilayer cavity passageway of different flow directions gradually reliably.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic plan view of a separator according to an embodiment of the present invention;
fig. 2 is a schematic front view of a fin plate according to an embodiment of the present invention;
FIG. 3 is a schematic view of a reverse structure of a fin plate provided in an embodiment of the present invention;
FIG. 4 is a first schematic diagram of a stacked three-dimensional explosive structure of a spacer plate and a fin plate according to an embodiment of the present invention;
FIG. 5 is a schematic top view of a stacked spacer and fin plate arrangement provided in an embodiment of the present invention;
FIG. 6 is a schematic view of a plane stretched structure formed by a bundle of plates provided in an embodiment of the present invention;
FIG. 7 is a schematic illustration of a three-dimensional stretched structure formed by a bundle of plates provided in an embodiment of the present invention;
FIG. 8 is a schematic plan view of a plate bundle provided in an embodiment of the present invention;
FIG. 9 is a first perspective view of a plate bundle provided in an embodiment of the present invention;
fig. 10 is a schematic view of a stacked three-dimensional explosive structure of a spacer plate and a fin plate according to an embodiment of the present invention;
FIG. 11 is a schematic view of a planar primary stretching structure formed by a bundle of plates provided in an embodiment of the present invention;
FIG. 12 is a schematic view of the plane secondary stretching structure in the direction A of FIG. 11;
fig. 13 is a schematic perspective view of a plate bundle according to an embodiment of the present invention.
Description of reference numerals:
1. a partition plate; 2. a fin plate; 3. a first non-welding area; 4. a strip-shaped groove; 5. a first welding area; 6. a second non-welding area; 7. a second welding area.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
One embodiment of the method for manufacturing a plate-fin heat exchanger based on diffusion welding as shown in fig. 1 to 13 is used for manufacturing a plate bundle of the plate-fin heat exchanger, and the method comprises the following steps: a strip-shaped groove 4 is arranged on the fin plate 2; coating a solder resist on non-welding areas of the partition board 1 and the fin board 2; a partition plate 1 and a fin plate 2 are arranged in a stacked manner; cutting the fin plate 2; diffusion welding in a vacuum diffusion furnace; the separator 1 is stretched.
As shown in fig. 1, four second non-welding areas 6 and three second welding areas 7 are provided on the front surface of the separator 1, and the second non-welding areas 6 are provided at intervals from the second welding areas 7. On the reverse side of the separator 1, a second non-welded area 6 and a second welded area 7 are provided, which are symmetrical to the front side. Coating a solder resist on the second non-soldering area 6, specifically, the solder resist comprises: and (3) boron nitride coating.
As shown in fig. 2 and 3, two parallel strip-shaped grooves 4 are formed in the fin plate 2, a strip-shaped first non-welding area 3 and a strip-shaped first welding area 5 are respectively formed on two sides of the strip-shaped groove 4 on the front surface (i.e., the first surface) of the fin plate 2, and a strip-shaped first welding area 5 and a strip-shaped first non-welding area 3 are respectively formed on two sides of the corresponding strip-shaped groove 4 on the back surface (i.e., the second surface) of the fin plate 2. A strip-shaped first welding area 5 is also arranged at the lower edge of the front surface of the fin plate 2, and a strip-shaped first non-welding area 3 is also arranged at the upper edge of the front surface; a strip-shaped first non-welded section 3 is also provided on the lower edge of the reverse side of the fin plate 2, and a strip-shaped first welded section 5 is also provided on the upper edge of the reverse side. Both ends of the strip-shaped groove 4 are also provided as the first non-welded area 3. A solder resist is coated on the first non-land 3.
On the side of the spacer 1 to which the fin plate 2 is attached, a second non-welding area 6 corresponding to the first non-welding area 3 on the fin plate 2 and a second welding area 7 corresponding to the first welding area 5 on the fin plate 2 are provided, respectively.
As shown in fig. 4, three layers of partition boards 1 and two layers of fin boards 2 are stacked at intervals in sequence, a second non-welding area 6 is arranged outside two outermost partition boards 1, and the arrangement directions of the strip-shaped grooves 4 are the same.
As shown in fig. 5, the separator 1 is stacked on the fin plate 2 with both end portions of the strip-shaped groove 4 exposed; the exposed portions of the fin plates 2 are cut along the edge lines of the separator 1 to form three fin plates 2 spaced apart.
As shown in fig. 6 to 9, five layers of separators 1 and four layers of fin plates 2, which are sequentially stacked at intervals, are diffusion-welded, and each layer of fin plate 2 includes: three fin plates 2 arranged in parallel; two separators 1 which are respectively stretched to the outside up and down along the stacking direction; simultaneously, stretching the two partition boards 1 of the second layer and the fourth layer to the left side along the arrangement direction of the fin plates 2, and stretching the partition board 1 of the third layer to the right side along the arrangement direction of the fin plates 2; and finally forming a plate bundle with four layers of cavities, wherein each layer of cavity comprises: two cavity channels. Flowing a first fluid medium to the inner side in the three left cavity channels; the second fluid medium flows through the three right-hand hollow channels to the outside.
As shown in fig. 10, five layers of partition boards 1 and four layers of fin plates 2 are sequentially stacked at intervals, the second non-welding area 6 is arranged outside two outermost partition boards 1, and the strip-shaped grooves 4 of adjacent layers of fin plates 2 are vertically arranged.
As shown in fig. 11 to 12, nine layers of separators 1 and eight layers of fin plates 2 are diffusion-welded at intervals, and each layer of fin plate 2 includes: three parallel fin plates 2 of arranging, and the setting direction of the bar groove 4 of adjacent layer fin plate 2 sets up perpendicularly.
Firstly, respectively stretching two outer side partition boards 1 up and down for the first time along the stacking direction; simultaneously, stretch five baffle 1 on first layer, second floor, fifth layer, sixth layer and the ninth layer to the left side for the first time along the first row cloth direction of fin board 2, stretch four baffle 1 on third layer, fourth layer, seventh layer and the eighth layer to the right side for the first time along the first row cloth direction of fin board 2, form four layers of cavities, every layer of cavity includes: three cavity channels.
Then, respectively stretching the two outer side partition boards 1 up and down for the second time along the stacking direction; simultaneously, stretch four baffle 1 on second layer, third layer, sixth layer and the seventh layer to the left side second along the second direction of arranging of fin board 2, stretch five baffle 1 on first layer, fourth layer, fifth layer, eighth layer and the ninth layer to the right side second along the second direction of arranging of fin board 2, form four layers of cavities again, every layer of cavity includes: three cavity channels. The second arrangement direction is perpendicular to the first arrangement direction.
As shown in fig. 13, a plate bundle of eight layers of cavities is finally formed, each layer of cavities including: the cavity channels of two adjacent layers are vertical in direction.
Circulating a first fluid medium in the four layers of cavity channels in the first arrangement direction; and circulating a second fluid medium in the four layers of cavity channels in the second arrangement direction.
As an alternative embodiment, the strip-shaped grooves 4 of each layer of fin plate 2 are arranged at different angles, but do not include 90 degrees.
As an alternative embodiment, diffusion welding is performed first, and then the fin plate 2 is cut.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A manufacturing method of a plate-fin heat exchanger based on diffusion welding is characterized by comprising the following steps:
the manufacturing method comprises the following steps that partition plates (1) and fin plates (2) are arranged in a stacking and interval mode, a plurality of fin plates (2) are arranged between every two adjacent partition plates (1) in an interval mode, and first welding areas (5) at two opposite ends of each fin plate (2) are respectively welded with second welding areas (7) of every two adjacent partition plates (1);
two separators (1) which are respectively stretched outwards along the stacking direction; and simultaneously, respectively stretching two adjacent partition plates (1) welded with the fin plates (2) outwards along the arrangement direction of the fin plates (2) to form a plate bundle with a cavity channel.
2. The manufacturing method of the plate-fin heat exchanger based on diffusion welding according to claim 1, characterized in that a plurality of parallel strip-shaped grooves (4) are formed in the fin plate (2), the partition plates (1) are respectively stacked on two sides of the fin plate (2), and two end portions of the strip-shaped grooves (4) are exposed; and cutting the exposed part of the fin plate (2) along the edge line of the separator (1) to form a plurality of fin plates (2) distributed at intervals.
3. The manufacturing method of the plate-fin heat exchanger based on diffusion welding as claimed in claim 2, characterized in that a first non-welding area (3) and a first welding area (5) are respectively arranged on two sides of the strip-shaped groove (4) on the first surface of the fin plate (2), and a first welding area (5) and a first non-welding area (3) are respectively arranged on two sides of the corresponding strip-shaped groove (4) on the second surface of the fin plate (2);
a first welding area (5) is arranged on the side edge of a first non-welding area (3) which is arranged on the first surface and the second surface of the fin plate (2) and close to the strip-shaped groove (4) on the edge; a first non-welding area (3) is arranged on the side edge of a first welding area (5) which is arranged on the first surface and the second surface of the fin plate (2) and is close to the strip-shaped groove (4) on the edge;
and a second non-welding area (6) corresponding to the first non-welding area (3) on the fin plate (2) and a second welding area (7) corresponding to the first welding area (5) on the fin plate (2) are respectively arranged on one surface, which is attached to the fin plate (2), of the partition plate (1).
4. Method for manufacturing a diffusion soldering based plate fin heat exchanger according to claim 3, characterized in that the first non-soldering area (3) and/or the second non-soldering area (6) is coated with solder resist.
5. The method for manufacturing a diffusion welding-based plate-fin heat exchanger according to any one of claims 1-4, wherein the plate bundle is formed by stacking a plurality of layers of fin plates (2) and separators (1) in sequence, and the outermost layer is the separator (1).
6. The method of manufacturing a diffusion welding based plate and fin heat exchanger of claim 5,
and diffusion welding the laminated fin plate (2) and the separator (1).
7. The method for manufacturing a plate-fin heat exchanger based on diffusion welding according to claim 6, wherein the arrangement directions of the strip-shaped grooves (4) on the fin plates (2) are the same.
8. The method for manufacturing a plate-fin heat exchanger based on diffusion welding according to claim 6, wherein the arrangement direction of the strip-shaped grooves (4) on at least one fin plate (2) is arranged at an angle with the arrangement direction of the strip-shaped grooves (4) on the other fin plates (2).
9. The method of fabricating a diffusion welding based plate fin heat exchanger of claim 8, wherein the angle is 90 degrees.
10. The manufacturing method of the diffusion welding based plate-fin heat exchanger according to claim 8 or 9, characterized in that the fin plate (2) is stretched twice in different directions according to the different arrangement directions of the strip-shaped grooves (4).
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| CN202210812732.5A CN114888423B (en) | 2022-07-12 | 2022-07-12 | Manufacturing method of plate-fin heat exchanger based on diffusion welding |
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| CN202210812732.5A CN114888423B (en) | 2022-07-12 | 2022-07-12 | Manufacturing method of plate-fin heat exchanger based on diffusion welding |
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