CN112658628B - Manufacturing process of plate-fin heat exchanger - Google Patents
Manufacturing process of plate-fin heat exchanger Download PDFInfo
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- CN112658628B CN112658628B CN202011493627.7A CN202011493627A CN112658628B CN 112658628 B CN112658628 B CN 112658628B CN 202011493627 A CN202011493627 A CN 202011493627A CN 112658628 B CN112658628 B CN 112658628B
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Abstract
The invention discloses a manufacturing process of a plate-fin heat exchanger, which relates to the technical field of plate-fin heat exchangers and adopts the technical scheme that the manufacturing process comprises the following steps: placing the upper shell in a die, and stamping at one time to form a first liquid inlet and a second liquid inlet; placing the lower shell in a die, and stamping at one time to form a first liquid outlet and a second liquid outlet; placing the partition board in a die, punching to form a concave part and a convex part, and respectively punching to form a first circular through hole and a second circular through hole in the concave part and the convex part; assembling the heat exchanger on a brazing clamp plate: placing the workpiece on the clamp disc and the clamp disc on a workpiece vehicle together, and sending the workpiece and the clamp disc into a vacuum brazing furnace; and heating and forming in the furnace to obtain the heat exchanger. The invention solves the problem of small contact area between the liquid to be cooled and the cooling liquid, and achieves the effect of increasing the contact area between the liquid to be cooled and the cooling liquid.
Description
Technical Field
The invention relates to the technical field of plate-fin heat exchangers, in particular to a manufacturing process of a plate-fin heat exchanger.
Background
At present, the plate-fin heat exchanger plays a role in mutual heat exchange among various working media, and achieves the purpose of mutual conversion of gas and liquid of the working media through the mutual heat exchange.
In the prior art, reference is made to a chinese patent with an authorization publication number of CN1099580C, which discloses a manufacturing process of a teflon plate-fin heat exchanger, and the process comprises: preparing a modified reinforced polytetrafluoroethylene raw material; cold pressing the prepared raw materials into a seal, a fin, a partition plate and an end enclosure by using a die respectively, and sintering, cooling and molding; covering a polyvinylidene fluoride plastic film on the surface of a partition plate, performing hot-pressing fit, placing a cover plate on a lower fixture, overlapping a plurality of channels on the cover plate layer by layer to form a plate-fin heat exchanger core body provided with the cover plate, placing the whole body into a furnace to be heated and bonded into a whole body after the fixture is clamped, and then installing an upper end enclosure, a connecting pipe and the like to obtain the polytetrafluoroethylene plate-fin heat exchanger.
However, in the plate-fin heater manufactured by the above process, the partition plate is stacked between the upper clamp and the lower clamp, so that the liquid to be cooled can only exchange heat with the cooling liquid in different flow channels through the side wall of the partition plate, that is, the contact area between the liquid to be cooled and the cooling liquid is small, thereby affecting the heat exchange efficiency of the liquid to be cooled.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a manufacturing process of a plate-fin heat exchanger, which achieves the effect of increasing the contact area between the liquid to be cooled and the cooling liquid by stamping a convex part and a concave part on the surface of a partition plate.
The above object of the present invention is achieved by the following means.
A manufacturing process of a plate-fin heat exchanger comprises the following steps:
s1, placing the upper shell in a die, and punching at one time to form a first liquid inlet and a second liquid inlet; placing the lower shell in a die, and stamping at one time to form a first liquid outlet and a second liquid outlet;
s2, placing the partition board in a mold, punching to form a concave part and a convex part, and respectively punching to form a first circular through hole and a second circular through hole in the concave part and the convex part;
s3, assembling the heat exchanger on the brazing clamp plate: after the plurality of partition plates are sequentially stacked, the upper shell is stacked to the tops of the plurality of partition plates, the first liquid inlet and the plurality of first circular through holes are positioned on the same plumb line, and the second liquid inlet and the plurality of second circular through holes are positioned on the same plumb line; stacking a plurality of partition plates to the bottom of the lower shell, so that the first liquid outlet and the plurality of first circular through holes are positioned on the same plumb line, and the second liquid outlet and the plurality of second circular through holes are positioned on the same plumb line; the two sunken parts surround to form an outer cavity, and the two convex parts surround to form an inner cavity; fins are respectively arranged in the outer cavity and the inner cavity; shaping the assembled workpiece, and fixing the workpiece on a clamp disc by using a screw;
s4, placing the workpiece on the clamp disc and the clamp disc on a workpiece vehicle together, and sending the workpiece and the clamp disc into a vacuum brazing furnace; and heating and forming in the furnace to obtain the heat exchanger.
By adopting the technical scheme, the cooling liquid enters the liquid inlet flow channel from the first liquid inlet and flows into the outer cavity from the liquid inlet flow channel; the liquid to be cooled enters the cooling flow channel from the second liquid inlet and flows into the inner cavity from the cooling flow channel; the convex part and the concave part are formed by punching the surface of the clapboard, and the outer cavity and the inner cavity are sequentially arranged at intervals along the vertical direction; thereby the area of contact of inner chamber and exocoel has been increased, and then increased the area of contact of coolant liquid and the liquid of waiting to cool, improved the heat exchange efficiency between coolant liquid and the liquid of waiting to cool.
The present invention in a preferred example may be further configured to: in step S1, placing the two connecting pipes which are cut and formed by stamping into a die, and stamping the ends of the connecting pipes to form a ring-cutting groove; and respectively welding the two connecting pipes in the first liquid inlet and the second liquid inlet.
Through adopting above-mentioned technical scheme, when connecting heat exchanger and outside pipeline, earlier with the link and the connecting pipe threaded connection of outside pipeline, the sealing washer in the outside pipeline this moment inlays in the ring grooving to improve the leakproofness between outside pipeline and the connecting pipe, reduce the possibility that liquid spills over by the seam crossing between outside pipeline and the connecting pipe.
The present invention in a preferred example may be further configured to: in step S1, a first anti-pressure arc plate is formed by downward stamping on the top of the upper housing; and stamping upwards at the bottom of the lower shell to form a second anti-pressure arc plate.
By adopting the technical scheme, the convex structure of the first pressure-resistant arc plate can share the pressure applied to the bottom surface of the upper shell when liquid flows into the liquid inlet flow channel and the cooling flow channel; the convex structure of the second anti-pressure arc plate can share the pressure applied to the top of the lower shell when liquid flows into the liquid inlet flow channel and the cooling flow channel; thereby reducing the possibility of the upper and lower cases being deformed in a local area by pressure.
The present invention in a preferred example may be further configured to: in step S3, the processed upper shell, the processed lower shell and the plurality of partition plates are placed in warm water to be soaked for 30-40min, and then are continuously placed in caustic soda solution with the mass fraction of 4-6% to be soaked for 2-4 min; adjusting pH to 7.5, washing with clear water, and drying.
By adopting the technical scheme, the greasy dirt attached to the surface layer of the workpiece can be effectively removed through alkali liquor treatment, and the possibility of oxidation of the grease on the workpiece after heating in the subsequent heating process is reduced.
The present invention in a preferred example may be further configured to: in step S3, after the plurality of partition boards are sequentially stacked, overlapping edges of two adjacent partition boards, bending the two adjacent partition boards upwards to form a first seal edge, and coating a welding layer in the first seal edge; attaching the two convex parts along the first circular through hole to form a second sealed edge, and coating a welding layer in the second sealed edge; the welding layer is 4104 aluminum alloy; the separator is 3003 aluminum alloy.
Through adopting above-mentioned technical scheme, through setting up first banding and second banding, the area that the face is connected to the adjacent baffle of increase, and then improves the joint strength between two baffles, reduces the connection face of adjacent baffle and produces the crack and the possibility of weeping under the effect of too high hydraulic pressure to leakproofness and compressive capacity between two baffles are improved.
The present invention in a preferred example may be further configured to: in step S3, bending the four connecting extending edges cut into strips, and then respectively attaching the four connecting extending edges to the four side walls of the upper shell, and coating a welding layer between the connecting extending edges and the side walls of the upper shell; and bending four edges of the partition board adjacent to the upper shell upwards, respectively attaching the four edges to the connecting extending edges, and coating a welding layer between the connecting extending edges and the partition board.
Through adopting above-mentioned technical scheme, because connect and prolong the limit and be the U-shaped, connect and prolong two lateral walls on limit respectively with last casing and baffle fixed connection to improve the connection area between baffle and the last casing, and then strengthen joint strength and the leakproofness between last casing and the baffle.
The present invention in a preferred example may be further configured to: the specific process for heating the vacuum brazing furnace comprises the following steps:
s4.1, starting a vacuum pump, enabling the vacuum degree in the vacuum brazing furnace to be 0.3-0.4KPa, transmitting electricity at the speed of 3-4 ℃/min, heating to 350 ℃, and preserving heat for 10-12h for preheating;
s4.2, adjusting the vacuum degree in the vacuum brazing furnace to be 0.8-1KPa, adjusting the temperature in the furnace to be 620-630 ℃, preserving the heat for 0.5-1h, and performing high-temperature purification on the workpiece;
s4.3, adjusting the temperature in the furnace to 580-;
s4.4, adjusting the temperature value in the furnace 620 and 630 ℃, and keeping the temperature for 1 h; adjusting the vacuum degree in the vacuum brazing furnace to be 0.8-1KPa, cooling to 550-560 ℃ at the speed of 3-4 ℃/min, preserving the heat for 2-3h, and discharging.
By adopting the technical scheme, the melting point of 4104 aluminum alloy is 580 ℃, the welding layer is melted in the heat preservation process, the two workpieces are bonded together, and meanwhile, the heating temperature does not influence the shape of the separator because the melting point of the separator is 650 ℃ and the separator is 3003 aluminum alloy.
In summary, compared with the prior art, the invention has the following beneficial effects:
1. the convex part and the concave part are formed by punching the surface of the clapboard, and the outer cavity and the inner cavity are sequentially arranged at intervals along the vertical direction; thereby the area of contact of inner chamber and exocoel has been increased, and then increased the area of contact of coolant liquid and the liquid of waiting to cool, improved the heat exchange efficiency between coolant liquid and the liquid of waiting to cool. (ii) a
2. The convex structures of the first pressure-resistant arc plate and the second pressure-resistant arc plate can share the pressure applied by liquid to the surfaces of the upper shell and the lower shell; thereby reducing the possibility of the upper shell and the lower shell deforming under pressure in local areas;
3. through setting up first banding and second banding, the area that the face is connected to the adjacent baffle of increase, and then improves the joint strength between two baffles, reduces the connection face of adjacent baffle and produces the crack and the possibility of weeping under the effect of too high hydraulic pressure.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic view showing the structure of the lower case of the present invention;
FIG. 3 is a cross-sectional view of a highlighted heat exchange unit of the present invention;
FIG. 4 is an enlarged schematic view at A in FIG. 3;
FIG. 5 is a cross-sectional view of a highlighted weld layer of the present invention.
In the figure: 1. an upper housing; 11. a first liquid inlet; 12. a second liquid inlet; 13. a first compression-resistant arc plate; 14. a connecting pipe; 15. an inner tube; 16. annularly cutting grooves; 17. connecting and extending edges; 2. a lower housing; 21. a first liquid outlet; 22. a second liquid outlet; 23. a second anti-pressure arc plate; 3. a heat exchange unit; 31. a partition plate; 311. a structural layer; 312. welding the layers; 32. an outer cavity; 33. an inner cavity; 34. first edge sealing; 35. second edge sealing; 4. a liquid inlet flow channel; 5. a cooling flow channel; 6. a fin; 7. a recessed portion; 8. a boss portion; 71. a first circular through hole; 81. a second circular through hole; 9. an auxiliary sealing plate; 91. a unit plate; 92. a connecting plate; 93. a bolt; 94. a heat-resistant gasket; 95. an elastic air bag.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1: a plate-fin heat exchanger is shown in figures 1 and 2 and comprises an upper shell 1 and a lower shell 2, wherein a plurality of groups of heat exchange units 3 are vertically arranged between the upper shell 1 and the lower shell 2. Each group of heat exchange units 3 comprises two opposite clapboards 31, and the surface of each clapboard 31 is provided with a concave part 7 and a convex part 8; the edges of two adjacent baffles 31 are folded upwards to form a first sealed edge 34. The two partition plates 31 of each group of heat exchange units 3 are fixedly connected through the convex parts 8, and the two partition plates 31 of the two adjacent groups of heat exchange units 3 are fixedly connected through the concave parts 7; the two concave parts 7 surround to form an outer cavity 32, and the two convex parts 8 surround to form an inner cavity 33. The two convex parts 8 are attached to form a second sealing edge 35 arranged on the peripheral side of the first circular through hole 71; the two concave parts 7 are attached to form a second sealing edge 35 arranged on the peripheral side of the second circular through hole 81. Through setting up first banding 34 and second banding 35, the area that the face is connected to adjacent baffle 31 of increase, and then improves the joint strength between two baffles 31, reduces the connection face of adjacent baffle 31 and produces the crack and the possibility of weeping under the effect of too high hydraulic pressure to leakproofness and compressive capacity between two baffles 31 are improved.
As shown in fig. 3, a first circular through hole 71 is formed at the bottom of each concave portion 7, and two adjacent outer cavities 32 are communicated with each other through the first circular through hole 71; the outer cavities 32 are communicated with each other to form a vertically arranged liquid inlet flow passage 4. A second circular through hole 81 is formed in the top of each boss 8, and two adjacent inner cavities 33 are communicated through the second circular through hole 81; the plurality of inner chambers 33 are communicated with each other to form the cooling flow passage 5 arranged vertically. The top of the upper shell 1 is provided with a first liquid inlet 11 and a second liquid inlet 12; the first liquid inlet 11 is communicated with the liquid inlet flow channel 4, and the second liquid inlet 12 is communicated with the cooling flow channel 5. A first liquid outlet 21 and a second liquid outlet 22 are formed in the top of the lower shell 2; the first liquid outlet 21 communicates with the liquid inlet flow path 4, and the second liquid outlet 22 communicates with the cooling flow path 5.
As shown in fig. 3, the outer cavity 32 and the inner cavity 33 are sequentially arranged at intervals in the vertical direction; the cooling liquid enters the liquid inlet flow channel 4 from the first liquid inlet 11 and flows into the outer cavity 32 from the liquid inlet flow channel 4; the liquid to be cooled enters the cooling flow channel 5 from the second liquid inlet 12 and flows into the inner cavity 33 from the cooling flow channel 5; the cooling fluid transfers heat to the fluid to be cooled. During the heat exchange process, liquid flows above and below the partition plate 31, so that the pressure above and below the partition plate 31 is balanced, and the possibility that the partition plate 31 is wrapped or deformed under the pressure of the liquid is reduced. The thickness of the upper shell 1 is equal to that of the lower shell 2, and the thickness ratio of the upper shell 1 to the partition plate 31 is 5: 1. since the upper and lower cases 1 and 2 have a relatively thick thickness, the upper and lower cases 1 and 2 have a relatively high structural strength, thereby improving the deformation resistance of the upper and lower cases 1 and 2 and enhancing the safety of the heat exchanger.
As shown in fig. 3, two first pressure-resistant arc plates 13 protruding downward are disposed at the top of the upper housing 1, and the two first pressure-resistant arc plates 13 are respectively located above the first liquid outlet 21 and the second liquid outlet 22. Lower casing 2 top is provided with two bellied second anti-pressure arc boards 23 that make progress, and two second anti-pressure arc boards 23 are located first inlet 11 and second inlet 12 top respectively. The convex structure of the first pressure-resistant arc plate 13 can share the pressure applied to the bottom surface of the upper shell 1 when the liquid flows into the liquid inlet flow channel 4 and the cooling flow channel 5; the convex structure of the second anti-pressure arc plate 23 can share the pressure applied to the top of the lower shell 2 when the liquid flows into the liquid inlet flow channel 4 and the cooling flow channel 5; thereby reducing the possibility of the upper case 1 and the lower case 2 being deformed in a local area by pressure.
As shown in fig. 3, the upper case 1 has connecting extensions 17 each having a U-shaped longitudinal section and fixed to four side walls thereof. The side of the connecting extending edge 17 far away from the upper shell 1 is fixedly connected with the side of the first sealing edge 34 near the upper shell 1. Because the connecting extending edge 17 is U-shaped, two side walls of the connecting extending edge 17 are respectively and fixedly connected with the upper shell 1 and the partition plate 31, so that the connecting area between the partition plate 31 and the upper shell 1 is increased, and the connecting strength and the sealing property between the upper shell 1 and the partition plate 31 are further enhanced.
As shown in fig. 5, each of the connecting flange 17, the first sealing edge 34 and the second sealing edge 35 includes a structural layer 311 and two welding layers 312 respectively disposed on two sides of the structural layer 311. The structure layer 311 is made of 3003 aluminum alloy and has a melting point of 650 ℃; the material of the welding layer 312 is 4104 aluminum alloy, and the melting point is 580 ℃. The 3003 aluminum alloy has high structural strength and heat conductivity, and can improve the structural strength and the heat exchange efficiency of the heat exchanger.
As shown in fig. 3, a plurality of fins 6 are uniformly distributed in the outer cavity 32 along the circumference of the first circular through hole 71; a plurality of fins 6 are uniformly distributed in the inner cavity 33 along the circumferential direction of the second circular through hole 81. The fins 6 can increase the internal surface area of the liquid inlet flow channel 4 and the cooling flow channel 5, thereby increasing the heat exchange efficiency of the liquid inlet flow channel 4 and the cooling flow channel 5.
As shown in FIG. 3, two connecting pipes 14 are fixed to the top of the upper housing 1, wherein one connecting pipe 14 is in communication with the first inlet 11, and the other connecting pipe 14 is in communication with the second inlet 12. The outer peripheral surfaces of the two connecting pipes 14 are provided with external threads for being in threaded connection with an external pipeline. An inner pipe 15 is fixed to an inner peripheral surface of each of the connection pipes 14. An annular cutting groove 16 is formed at the top of the connecting pipe 15, and the depth of the annular cutting groove 16 is less than or equal to two thirds of the length of the inner pipe 15. When the heat exchanger and the external pipeline are connected, the connecting end of the external pipeline is connected with the connecting pipe 14 in a threaded mode, and the sealing ring in the external pipeline is embedded in the annular cutting groove 16, so that the sealing performance between the external pipeline and the connecting pipe 14 is improved. The outlet end of the outer conduit extends into the inner tube 15 so that liquid can be injected from the inner tube 15 into the connecting tube 14. Because the inner diameter of the connecting pipe 14 is larger than the outer diameter of the inner pipe 15, and the inner diameter of the outer cavity 32 is larger than the outer diameter of the connecting pipe 14, the pressure relief effect can be realized on the liquid entering the inner pipe 15, and the impact force generated when the liquid enters the heat exchanger can be reduced.
The working principle of the embodiment is as follows: the cooling liquid enters the liquid inlet flow channel 4 from the first liquid inlet 11 and flows into the outer cavity 32 from the liquid inlet flow channel 4; the liquid to be cooled enters the cooling flow channel 5 from the second liquid inlet 12 and flows into the inner cavity 33 from the cooling flow channel 5; the cooling fluid transfers heat to the fluid to be cooled. Then the cooling liquid flows out of the first liquid outlet 21 from the liquid inlet flow passage 4, and the liquid to be cooled flows out of the second liquid outlet 22 from the cooling flow passage 5.
A manufacturing process of a plate-fin heat exchanger comprises the following steps:
s1.1, placing an upper shell 1 in a die, conveying the upper shell to a punching table along the length direction of the punching table, and punching at one time to form a first liquid inlet 11, a second liquid inlet 12 and a first pressure-resistant arc plate 13; the lower housing 2 is placed in a die, and a first liquid outlet 21, a second liquid outlet 22 and a second anti-pressure arc plate 23 are formed on a punching table by one-time punching.
S1.2, the two connecting pipes 14 are respectively placed in a die, and the ends of the connecting pipes 14 are punched at one time to form the annular cutting grooves 16. Two connecting pipes 14 are respectively welded in the first liquid inlet 11 and the second liquid inlet 12; two inner tubes 15 are welded into the connecting tube 14, respectively.
S1.3, the partition plate 31 is placed in a die and conveyed to a stamping table along the length direction of the stamping table, a concave part 7 protruding towards the lower part of the partition plate 31 and a convex part 8 protruding towards the upper part of the partition plate 31 are formed through stamping, and a first circular through hole 71 and a second circular through hole 81 are formed in the concave part 7 and the convex part 8 through stamping respectively.
S2, placing the processed upper shell 1, the processed lower shell 2 and the plurality of partition plates 31 in warm water at 40 ℃ for soaking for 30min, and then continuing to put in caustic soda solution with the mass fraction of 4% for soaking for 2 min; after the soaking is finished, nitric acid is added into the caustic soda solution to adjust the pH value to 7.5, and then the caustic soda solution is washed by clean water and is placed into an oven at 100 ℃ for drying.
S3.1, assembling a heat exchanger on the brazing clamp plate: after the plurality of partition boards 31 are sequentially stacked, the edges of two adjacent partition boards 31 are overlapped and bent upwards to form a first seal edge 34, and a welding layer 312 is coated in the first seal edge 34; and (3) attaching the two convex parts 8 along the first circular through hole 71 to form a second sealing edge 35, and coating a welding layer 312 in the second sealing edge 35. The weld layer 312 is 4104 aluminum alloy.
S3.2, the two concave parts 7 surround to form an outer cavity 32, and the two convex parts 8 surround to form an inner cavity 33; fins 6 are provided in the outer chamber 32 and the inner chamber 33, respectively.
S3.3, stacking the upper shell 1 to the tops of the plurality of partition plates 31, enabling the first liquid inlet 11 and the plurality of first circular through holes 71 to be located on the same plumb line, and enabling the second liquid inlet 12 and the plurality of second circular through holes 81 to be located on the same plumb line; the plurality of partition plates 31 are stacked on the bottom of the lower housing 2, so that the first liquid outlet 21 and the plurality of first circular through holes 71 are located on the same vertical line, and the second liquid outlet 22 and the plurality of second circular through holes 81 are located on the same vertical line. The first liquid inlet 11, the first liquid outlet 21 and the plurality of first circular through holes 71 form a liquid inlet flow passage 4 of the heat exchanger, and the second liquid inlet 12, the second liquid outlet 22 and the plurality of second circular through holes 81 form a cooling flow passage 5 of the heat exchanger.
And S3.4, cutting the 3003 aluminum alloy into strip-shaped plates to form connecting extending edges 17. Bending the four connecting extending edges 17 into a U shape, respectively attaching the U shape to the four side walls of the upper shell 1, and coating a welding layer 312 between the connecting extending edges 17 and the side walls of the upper shell 1; four edges of the partition plate 31 adjacent to the upper case 1 are bent upward and respectively attached to the connecting extending edges 17, and a welding layer 312 is applied between the connecting extending edges 17 and the partition plate 31.
And S3.5, shaping the assembled workpiece, and fixing the workpiece on a clamp disc by using a screw rod.
And S4.1, placing the workpiece on the clamp disc and the clamp disc on a workpiece vehicle together, and sending the workpiece and the clamp disc into a vacuum brazing furnace. Starting a vacuum pump, enabling the vacuum degree in the vacuum brazing furnace to be 0.3KPa, transmitting electricity at the speed of 3 ℃/min, heating to 300 ℃, and preserving heat for 10h for preheating.
S4.2, adjusting the vacuum degree in the vacuum brazing furnace to be 0.8KPa, adjusting the temperature in the furnace to be 620 ℃, preserving the heat for 0.5h, and carrying out high-temperature purification on the workpiece.
And S4.3, adjusting the temperature in the furnace to be 580 ℃, continuously preserving the heat for 10 hours, and balancing the temperature difference between the inside and the outside of the workpiece. Since the melting point of 4104 aluminum alloy is 580 ℃, the welding layer 312 melts during the heat preservation process and bonds the two workpieces together, while since the separator 31 is 3003 aluminum alloy, the melting point is 650 ℃, which does not affect the shape of the separator 31.
S4.4, adjusting the temperature value in the furnace to 620 ℃, and keeping the temperature for 1 h; adjusting the vacuum degree in the vacuum brazing furnace to 0.8KPa, cooling to 550 ℃ at the speed of 3 ℃/min, preserving heat for 2h, and discharging.
Example 2: a manufacturing process of a plate-fin heat exchanger comprises the following steps:
s1.1, placing an upper shell 1 in a die, conveying the upper shell to a punching table along the length direction of the punching table, and punching at one time to form a first liquid inlet 11, a second liquid inlet 12 and a first pressure-resistant arc plate 13; the lower housing 2 is placed in a die, and a first liquid outlet 21, a second liquid outlet 22 and a second anti-pressure arc plate 23 are formed on a punching table by one-time punching.
S1.2, the two connecting pipes 14 are respectively placed in a die, and the ends of the connecting pipes 14 are punched at one time to form the annular cutting grooves 16. Two connecting pipes 14 are respectively welded in the first liquid inlet 11 and the second liquid inlet 12; two inner tubes 15 are welded into the connecting tube 14, respectively.
S1.3, the partition plate 31 is placed in a die and conveyed to a stamping table along the length direction of the stamping table, a concave part 7 protruding towards the lower part of the partition plate 31 and a convex part 8 protruding towards the upper part of the partition plate 31 are formed through stamping, and a first circular through hole 71 and a second circular through hole 81 are formed in the concave part 7 and the convex part 8 through stamping respectively.
S2, placing the processed upper shell 1, the processed lower shell 2 and the plurality of partition plates 31 in warm water at 60 ℃ for soaking for 40min, and then continuing to put in caustic soda solution with the mass fraction of 4-6% for soaking for 4 min; after the soaking is finished, nitric acid is added into the caustic soda solution to adjust the pH value to 7.5, and then the caustic soda solution is washed by clean water and is placed into an oven at 100 ℃ for drying.
S3.1, assembling a heat exchanger on the brazing clamp plate: after the plurality of partition boards 31 are sequentially stacked, the edges of two adjacent partition boards 31 are overlapped and bent upwards to form a first seal edge 34, and a welding layer 312 is coated in the first seal edge 34; and (3) attaching the two convex parts 8 along the first circular through hole 71 to form a second sealing edge 35, and coating a welding layer 312 in the second sealing edge 35. The weld layer 312 is 4104 aluminum alloy.
S3.2, the two concave parts 7 surround to form an outer cavity 32, and the two convex parts 8 surround to form an inner cavity 33; fins 6 are provided in the outer chamber 32 and the inner chamber 33, respectively.
S3.3, stacking the upper shell 1 to the tops of the plurality of partition plates 31, enabling the first liquid inlet 11 and the plurality of first circular through holes 71 to be located on the same plumb line, and enabling the second liquid inlet 12 and the plurality of second circular through holes 81 to be located on the same plumb line; the plurality of partition plates 31 are stacked on the bottom of the lower housing 2, so that the first liquid outlet 21 and the plurality of first circular through holes 71 are located on the same vertical line, and the second liquid outlet 22 and the plurality of second circular through holes 81 are located on the same vertical line. The first liquid inlet 11, the first liquid outlet 21 and the plurality of first circular through holes 71 form a liquid inlet flow passage 4 of the heat exchanger, and the second liquid inlet 12, the second liquid outlet 22 and the plurality of second circular through holes 81 form a cooling flow passage 5 of the heat exchanger.
S3.4, bending the four connecting extending edges 17 into a U shape, and then respectively attaching the U shape to the four side walls of the upper shell 1, and coating a welding layer 312 between the connecting extending edges 17 and the side walls of the upper shell 1; four edges of the partition plate 31 adjacent to the upper case 1 are bent upward and respectively attached to the connecting extending edges 17, and a welding layer 312 is applied between the connecting extending edges 17 and the partition plate 31.
And S3.5, shaping the assembled workpiece, and fixing the workpiece on a clamp disc by using a screw rod.
And S4.1, placing the workpiece on the clamp disc and the clamp disc on a workpiece vehicle together, and sending the workpiece and the clamp disc into a vacuum brazing furnace. Starting a vacuum pump, enabling the vacuum degree in the vacuum brazing furnace to be 0.4KPa, transmitting electricity at the speed of 4 ℃/min, heating to 350 ℃, and preserving heat for 12 hours for preheating.
S4.2, adjusting the vacuum degree in the vacuum brazing furnace to be 1KPa, adjusting the temperature in the furnace to be 630 ℃, preserving the heat for 1h, and carrying out high-temperature purification on the workpiece.
And S4.3, adjusting the temperature in the furnace to 600 ℃, continuously preserving the heat for 12 hours, and balancing the internal and external temperature difference of the workpiece.
S4.4, adjusting the temperature value in the furnace to 630 ℃, and keeping the temperature for 1 h; adjusting the vacuum degree in the vacuum brazing furnace to 1KPa, cooling to 560 ℃ at 4 ℃/min, preserving heat for 3h, and discharging.
Example 3: a manufacturing process of a plate-fin heat exchanger comprises the following steps:
s1.1, placing an upper shell 1 in a die, conveying the upper shell to a punching table along the length direction of the punching table, and punching at one time to form a first liquid inlet 11, a second liquid inlet 12 and a first pressure-resistant arc plate 13; the lower housing 2 is placed in a die, and a first liquid outlet 21, a second liquid outlet 22 and a second anti-pressure arc plate 23 are formed on a punching table by one-time punching.
S1.2, the two connecting pipes 14 are respectively placed in a die, and the ends of the connecting pipes 14 are punched at one time to form the annular cutting grooves 16. Two connecting pipes 14 are respectively welded in the first liquid inlet 11 and the second liquid inlet 12; two inner tubes 15 are welded into the connecting tube 14, respectively.
S1.3, the partition plate 31 is placed in a die and conveyed to a stamping table along the length direction of the stamping table, a concave part 7 protruding towards the lower part of the partition plate 31 and a convex part 8 protruding towards the upper part of the partition plate 31 are formed through stamping, and a first circular through hole 71 and a second circular through hole 81 are formed in the concave part 7 and the convex part 8 through stamping respectively.
S2, placing the processed upper shell 1, the processed lower shell 2 and the plurality of partition plates 31 in warm water at 48 ℃ for soaking for 35min, and then continuously placing the processed upper shell, the processed lower shell and the processed partition plates into caustic soda solution with the mass fraction of 5% for soaking for 3 min; after the soaking is finished, nitric acid is added into the caustic soda solution to adjust the pH value to 7.5, and then the caustic soda solution is washed by clean water and is placed into an oven at 100 ℃ for drying.
S3.1, assembling a heat exchanger on the brazing clamp plate: after the plurality of partition boards 31 are sequentially stacked, the edges of two adjacent partition boards 31 are overlapped and bent upwards to form a first seal edge 34, and a welding layer 312 is coated in the first seal edge 34; and (3) attaching the two convex parts 8 along the first circular through hole 71 to form a second sealing edge 35, and coating a welding layer 312 in the second sealing edge 35. The weld layer 312 is 4104 aluminum alloy.
S3.2, the two concave parts 7 surround to form an outer cavity 32, and the two convex parts 8 surround to form an inner cavity 33; fins 6 are provided in the outer chamber 32 and the inner chamber 33, respectively.
S3.3, stacking the upper shell 1 to the tops of the plurality of partition plates 31, enabling the first liquid inlet 11 and the plurality of first circular through holes 71 to be located on the same plumb line, and enabling the second liquid inlet 12 and the plurality of second circular through holes 81 to be located on the same plumb line; the plurality of partition plates 31 are stacked on the bottom of the lower housing 2, so that the first liquid outlet 21 and the plurality of first circular through holes 71 are located on the same vertical line, and the second liquid outlet 22 and the plurality of second circular through holes 81 are located on the same vertical line. The first liquid inlet 11, the first liquid outlet 21 and the plurality of first circular through holes 71 form a liquid inlet flow passage 4 of the heat exchanger, and the second liquid inlet 12, the second liquid outlet 22 and the plurality of second circular through holes 81 form a cooling flow passage 5 of the heat exchanger.
S3.4, bending the four connecting extending edges 17 into a U shape, and then respectively attaching the U shape to the four side walls of the upper shell 1, and coating a welding layer 312 between the connecting extending edges 17 and the side walls of the upper shell 1; four edges of the partition plate 31 adjacent to the upper case 1 are bent upward and respectively attached to the connecting extending edges 17, and a welding layer 312 is applied between the connecting extending edges 17 and the partition plate 31.
And S3.5, shaping the assembled workpiece, and fixing the workpiece on a clamp disc by using a screw rod.
And S4.1, placing the workpiece on the clamp disc and the clamp disc on a workpiece vehicle together, and sending the workpiece and the clamp disc into a vacuum brazing furnace. Starting a vacuum pump, enabling the vacuum degree in the vacuum brazing furnace to be 0.32KPa, transmitting electricity at the speed of 3.6 ℃/min, heating to 320 ℃, and preserving heat for 11 hours for preheating.
S4.2, adjusting the vacuum degree in the vacuum brazing furnace to be 0.9KPa, adjusting the temperature in the furnace to be 625 ℃, preserving the heat for 0.8h, and carrying out high-temperature purification on the workpiece.
And S4.3, adjusting the temperature in the furnace to be 590 ℃, continuously preserving the heat for 11 hours, and balancing the temperature difference between the inside and the outside of the workpiece.
S4.4, adjusting the temperature value in the furnace 620 and 630 ℃, and keeping the temperature for 1 h; adjusting the vacuum degree in the vacuum brazing furnace to be 0.9KPa, cooling to 555 ℃ at the speed of 3.6 ℃/min, preserving heat for 2.5h, and discharging.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (7)
1. A manufacturing process of a plate-fin heat exchanger is characterized by comprising the following steps: the method comprises the following steps:
s1, placing the upper shell (1) in a die, and punching at one time to form a first liquid inlet (11) and a second liquid inlet (12); placing the lower shell (2) in a die, and stamping at one time to form a first liquid outlet (21) and a second liquid outlet (22);
s2, placing the partition board (31) in a die, punching to form a concave part (7) and a convex part (8), and punching to form a first circular through hole (71) and a second circular through hole (81) in the concave part (7) and the convex part (8) respectively;
s3, assembling the heat exchanger on the brazing clamp plate: after the plurality of partition plates (31) are sequentially stacked, the upper shell (1) is stacked to the tops of the plurality of partition plates (31), the first liquid inlet (11) and the plurality of first circular through holes (71) are positioned on the same plumb line, and the second liquid inlet (12) and the plurality of second circular through holes (81) are positioned on the same plumb line; stacking a plurality of partition plates (31) to the bottom of the lower shell (2) to enable the first liquid outlet (21) and the plurality of first circular through holes (71) to be positioned on the same vertical line and enable the second liquid outlet (22) and the plurality of second circular through holes (81) to be positioned on the same vertical line; the two sunken parts (7) surround to form an outer cavity (32), and the two convex parts (8) surround to form an inner cavity (33); fins (6) are respectively arranged in the outer cavity (32) and the inner cavity (33); shaping the assembled workpiece, and fixing the workpiece on a clamp disc by using a screw;
s4, placing the workpiece on the clamp disc and the clamp disc on a workpiece vehicle together, and sending the workpiece and the clamp disc into a vacuum brazing furnace; and heating and forming in the furnace to obtain the heat exchanger.
2. A process for manufacturing a plate-fin heat exchanger according to claim 1, characterized in that: in step S1, two connecting pipes (14) which are cut and formed by punching are respectively placed in a die, and an annular cutting groove (16) is formed at the end part of the connecting pipe (14) by punching; two connecting pipes (14) are respectively welded in the first liquid inlet (11) and the second liquid inlet (12).
3. A process for manufacturing a plate-fin heat exchanger according to claim 1, characterized in that: in step S1, a first pressure-resistant arc plate (13) is formed by downwards punching the top of the upper shell (1); and a second anti-pressure arc plate (23) is formed at the bottom of the lower shell (2) by upward stamping.
4. A process for manufacturing a plate-fin heat exchanger according to claim 1, characterized in that: in the step S3, the processed upper shell (1), the processed lower shell (2) and the plurality of partition boards (31) are placed in warm water to be soaked for 30-40min, and then are continuously placed in a caustic soda solution with the mass fraction of 4-6% to be soaked for 2-4 min; adjusting pH to 7.5, washing with clear water, and drying.
5. A process for manufacturing a plate-fin heat exchanger according to claim 1, characterized in that: in the step S3, after a plurality of partition boards (31) are sequentially stacked, the edges of two adjacent partition boards (31) are overlapped, the two adjacent partition boards are bent upwards to form a first sealed edge (34), and a welding layer (312) is coated in the first sealed edge (34); attaching the two bulges (8) along the first circular through hole (71) to form a second sealed edge (35), and coating a welding layer (312) in the second sealed edge (35); the welding layer (312) is 4104 aluminum alloy; the separator (31) is 3003 aluminum alloy.
6. A process for manufacturing a plate-fin heat exchanger according to claim 1, characterized in that: in the step S3, bending four connecting extending edges (17) cut into strips, and respectively attaching the bent connecting extending edges to four side walls of the upper shell (1), and coating a welding layer (312) between the connecting extending edges (17) and the side walls of the upper shell (1); four edges of the partition board (31) adjacent to the upper shell (1) are bent upwards and are respectively attached to the connecting extending edges (17), and welding layers (312) are coated between the connecting extending edges (17) and the partition board (31).
7. A process for manufacturing a plate-fin heat exchanger according to claim 1, characterized in that: the specific process for heating the vacuum brazing furnace comprises the following steps:
s4.1, starting a vacuum pump, enabling the vacuum degree in the vacuum brazing furnace to be 0.3-0.4KPa, transmitting electricity at the speed of 3-4 ℃/min, heating to 350 ℃, and preserving heat for 10-12h for preheating;
s4.2, adjusting the vacuum degree in the vacuum brazing furnace to be 0.8-1KPa, adjusting the temperature in the furnace to be 620-630 ℃, preserving the heat for 0.5-1h, and performing high-temperature purification on the workpiece;
s4.3, adjusting the temperature in the furnace to 580-;
s4.4, adjusting the temperature value in the furnace 620 and 630 ℃, and keeping the temperature for 1 h; adjusting the vacuum degree in the vacuum brazing furnace to be 0.8-1KPa, cooling to 550-560 ℃ at the speed of 3-4 ℃/min, preserving the heat for 2-3h, and discharging.
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