CN113414558A - Manufacturing method of coil heat exchanger core - Google Patents
Manufacturing method of coil heat exchanger core Download PDFInfo
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- CN113414558A CN113414558A CN202110969406.0A CN202110969406A CN113414558A CN 113414558 A CN113414558 A CN 113414558A CN 202110969406 A CN202110969406 A CN 202110969406A CN 113414558 A CN113414558 A CN 113414558A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
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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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
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- Mechanical Engineering (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a manufacturing method of a coil heat exchanger core, which comprises the following steps: respectively processing a coiled pipe, an upper plate, a cover plate, an oil collecting plate and a plurality of partition plates, and processing lap joints on the upper plate and the cover plate; inserting an assembly tool with a guide cone into an upper end opening of each coiled pipe, sequentially penetrating a lower plate and a plurality of partition plates through the guide cones to be assembled on the coiled pipes under the guide of the assembly tool, and positioning the positions between the lower plate and the plurality of partition plates through a positioning tool; coating brazing filler metal at the positions of the coiled pipe and the upper plate to be brazed; assembling a cover plate on an upper plate, welding an oil collecting plate and a joint to form an oil collecting plate assembly, and assembling the oil collecting plate assembly on a coiled pipe through an assembling tool; coating brazing filler metal at the positions to be brazed of the coiled pipe and the oil collecting plate assembly; and (3) additionally arranging brazing tools on the periphery of the heat exchanger core assembly, and placing the heat exchanger core in a vacuum brazing furnace for vacuum brazing. According to the invention, through designing the assembling tool, the positioning tool and the brazing tool, the manufacturing difficulty is overcome, and the processing difficulty is reduced.
Description
Technical Field
The invention belongs to the technical field of aerospace precision manufacturing, and relates to a manufacturing method of a coil heat exchanger core.
Background
The structural schematic diagram of the engine coiled tube heat exchanger core is shown in fig. 1, fig. 2 and fig. 3, the engine coiled tube heat exchanger core is composed of a lower plate, a partition plate, a coiled tube, an upper plate, a cover plate, a joint and an oil collecting plate, and the engine coiled tube heat exchanger core is made of austenitic stainless steel. A, B cavities are formed among the parts through vacuum brazing and argon arc welding, and a medium circulates in the A, B cavities to cool high-temperature fuel gas entering between the partition plates. The heat exchanger core has 2400 coiled pipes, the diameters of the coiled pipes are 2.2mm, the fit clearance among the coiled pipes, the upper plate, the lower plate and the partition plate is small, and the whole assembly difficulty is great; in addition, the wall thickness of the partition plate is only 1mm, and the partition plate is easy to deform when high-temperature gas passes through a channel between the partition plates, so that the assembly difficulty is increased undoubtedly.
Disclosure of Invention
The invention aims to provide a manufacturing method of a coil heat exchanger core, which overcomes the technical bias, reduces the processing difficulty and ensures the brazing quality.
The invention is realized by the following technical scheme:
a method for manufacturing a core of a serpentine tube heat exchanger includes the following steps:
(1) respectively processing a coiled pipe, a lower plate, an upper plate, a cover plate, an oil collecting plate and a plurality of partition plates, wherein the lower plate, the upper plate, the partition plates and the oil collecting plate are all provided with through holes matched with the outer diameter of the coiled pipe; lapping joints are processed on the upper plate and the cover plate, so that the upper plate and the cover plate can be lapped and assembled;
(2) after an upper plate, a cover plate, partition plates, an oil collecting plate and a lower plate are cleaned, an assembly tool with a guide cone is inserted into an opening at the upper end of each coiled pipe, the lower plate and the partition plates sequentially penetrate through the guide cones to be assembled on the coiled pipes under the guide of the assembly tool, and the positions between the lower plate and the partition plates are positioned through a positioning tool; assembling the upper plate above the partition plate through an assembling tool, positioning the upper plate and the partition plate through a positioning tool, obtaining an assembling assembly after assembling is completed, and taking the assembling tool out of the coiled pipe;
(3) uniformly coating paste-shaped brazing filler metal at the positions of the coiled pipe and the upper plate to be brazed;
(4) assembling a cover plate on an upper plate, performing spot welding positioning by adopting argon arc welding, and then polishing welding spots;
(5) welding the oil collecting plate and the joint into an oil collecting plate assembly by adopting argon arc welding, and assembling the oil collecting plate assembly onto the coiled pipe by using an assembling tool with a guide cone to obtain a heat exchanger core assembly;
(6) uniformly coating and injecting paste-shaped brazing filler metal at the positions to be brazed of the coiled pipe and the oil collecting plate assembly;
(7) a brazing tool is additionally arranged on the periphery of the heat exchanger core body assembly, and a brazing inhibitor is coated on the contact part of the assembly tool, the brazing tool and the positioning tool with the part;
(8) and (4) placing the heat exchanger core in a vacuum brazing furnace for vacuum brazing.
Furthermore, the brazing tool comprises first supporting blocks arranged on two sides of the lower plate, a second supporting block used for supporting the upper plate is arranged above the first supporting block, a supporting strip used for supporting the partition plate is arranged on the inner side of the second supporting block, and a third supporting block and a fourth supporting block used for supporting the oil collecting plate assembly are arranged above the second supporting block; the top of the cover plate is provided with a balancing weight, and the lower part of the coiled pipe is provided with aluminum silicate fiber for protecting the coiled pipe.
Furthermore, one end of the assembly tool is in a straight pipe shape and can be inserted into the coiled pipe, and the end face of the other end of the assembly tool is a conical surface.
Further, the paste brazing filler metal in the step (3) and the step (6) is strip nickel-based paste brazing filler metal.
Further, after the argon arc welding spot welding positioning is adopted in the step (4), an oxide layer at the welding point is polished completely through a pneumatic air gun.
Further, when the oil collecting plate assembly is welded by argon arc welding in the step (5), the welding wire is a stainless steel welding wire with the diameter of 1mm, the welding current is 50-80A, and the argon flow is 5-10L/min.
Further, the coating thickness of the solder resist in the step (7) is 0.1 mm.
Further, in the step (8), the heat exchanger core is placed in a vacuum brazing furnace, and vacuum brazing is performed according to the following parameters:
the cold state vacuum degree is 6-8 multiplied by 10 < -3 > Pa, and the working vacuum degree is 3-5 multiplied by 10 < -2 > Pa;
heating to 400-500 ℃ at the speed of 240-300 ℃/h, and keeping for 0.5-1 h;
heating to 800-950 ℃ at the speed of 300-360 ℃/h, and keeping for 2-3 h;
heating to 1000-1050 ℃ at the speed of 360-450 ℃/h, and keeping for 0.5-1 h;
after heating, carrying out vacuum cooling to 400-500 ℃ along with the furnace, and filling high-purity argon into the furnace;
and starting a fan to cool to below 100 ℃ after the pressure in the furnace reaches 6-8 multiplied by 104Pa, and discharging.
Further, after cooling and discharging, dismantling the brazing tool, polishing the brazing inhibitor remained on the heat exchanger core body assembly, and cleaning the heat exchanger core body assembly by using alcohol;
and (3) checking the size of the heat exchanger core assembly, and then carrying out a pressure test on the heat exchanger core assembly, wherein the test medium is purified water, the pressure is 6MPa, and the time is 20 min.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a manufacturing method of a coil heat exchanger core, which is characterized in that an assembly tool is designed, so that a lower plate, a partition plate, an upper plate and an oil collecting plate are respectively assembled with a coil through the assembly tool, the fit clearance between the coil and the upper plate, between the lower plate and the partition plate is ensured, and the assembly difficulty is reduced; meanwhile, the invention designs a positioning tool, and 2400 coiled pipes in each row are uniformly assembled; during assembly, the two rows of partition plates are attached to each other through the positioning tool, the assembly size between the partition plates is guaranteed, the positioning tool is in vacuum brazing along with the product entering a furnace, and the function of controlling the deformation of the partition plates can be achieved.
In order to solve the brazing difficulty between the cover plate and the upper plate, the structure of the cover plate and the upper plate is adjusted to a certain degree, the original butt joint is adjusted to be a lap joint, the brazing area is increased, and the joint strength is improved; in addition, the invisible brazing seam is transferred to the visible brazing seam, and even if the brazing seam leaks, the brazing seam can be repaired by a brazing filler metal repairing method; in order to control the deformation of parts, the invention also designs a brazing tool, aluminum silicate fibers arranged below the coiled pipe are used for protecting the coiled pipe, the first supporting block is used for supporting the lower plate, the second supporting block is used for supporting the upper plate, the third supporting block and the fourth supporting plate are used for supporting the oil collecting plate assembly, the supporting strips are used for supporting the partition plates, and the balancing weight arranged on the cover plate is used for applying a certain force to the brazing seam of the upper plate and the cover plate, so that the brazing seam strength is improved.
Drawings
FIG. 1 is a front view of a serpentine tube heat exchanger core of the present invention;
FIG. 2 is a side view of the serpentine tube heat exchanger core of the present invention;
FIG. 3 is a schematic view of the assembly fixture of the present invention assembled with a serpentine tube;
FIG. 4 is a schematic view of the positioning tool of the present invention assembled with a serpentine tube;
FIG. 5 is a schematic view of the assembly of the cover plate and the upper plate of the present invention;
FIG. 6 is a schematic view of the assembly of the brazing tool of the present invention with the core of the serpentine tube heat exchanger;
the device comprises a base plate, a lower plate, a partition plate, a coiled pipe, an upper plate, a cover plate, a joint, an oil collecting plate, an A channel, a B channel, an assembly tool, a positioning tool, an aluminum silicate fiber, a first supporting block, a second supporting block, a supporting strip, a first supporting block, a second supporting block, a positioning tool, a second supporting block, a supporting strip, a third supporting block, a fourth supporting block and a balancing weight, wherein the lower plate 1, the partition plate 2, the coiled pipe 3, the upper plate 4, the cover plate 5, the joint 6, the oil collecting plate 7, the channel A, the channel B, the assembly tool 10, the positioning tool 11, the aluminum silicate fiber 12, the first supporting block, the second supporting block, the supporting block 15, the third supporting block, the fourth supporting block and the fourth supporting block 18 are used as matching weights.
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.
Referring to fig. 4 to 6, a method for manufacturing a core of a serpentine tube heat exchanger includes the following steps:
(1) respectively processing a coiled pipe 3, a lower plate 1, an upper plate 4, a cover plate 5, an oil collecting plate 7 and a plurality of partition plates 2, wherein the lower plate 1, the upper plate 4, the partition plates 2 and the oil collecting plate 7 are all provided with through holes matched with the outer diameter of the coiled pipe 2; lap joints 6 are processed on the upper plate 4 and the cover plate 5, so that the upper plate 4 and the cover plate 5 can be assembled in a lap joint manner;
(2) after an upper plate 4, a cover plate 5, partition plates 2, an oil collecting plate 7 and a lower plate 1 are cleaned, an assembly tool 10 with a guide cone is inserted into an upper end opening of each serpentine tube 3, the lower plate 1 and a plurality of partition plates 2 are sequentially assembled on the serpentine tubes 3 through the guide cones under the guidance of the assembly tool 10, and the positions between the lower plate 1 and the plurality of partition plates 2 are positioned through a positioning tool 11; assembling the upper plate 4 above the partition plate 2 through an assembling tool 10, positioning the upper plate 4 and the partition plate 2 through a positioning tool 11, obtaining an assembling assembly after assembling is finished, and then taking the assembling tool out of the coiled pipe 3;
(3) uniformly coating and injecting paste-shaped brazing filler metal at the positions to be brazed of the coiled pipe 3 and the upper plate 4;
(4) assembling a cover plate 5 on an upper plate 4, performing spot welding positioning by adopting argon arc welding, and then polishing welding spots;
(5) welding the oil collecting plate 7 and the joint 6 into an oil collecting plate 7 assembly by adopting argon arc welding, and assembling the oil collecting plate 7 assembly onto the coiled pipe 3 by using an assembling tool 10 with a guide cone to obtain a heat exchanger core assembly;
(6) uniformly coating and injecting paste-shaped brazing filler metal at the positions to be brazed of the assemblies of the coiled pipe 3 and the oil collecting plate 7;
(7) a brazing tool is additionally arranged on the periphery of the heat exchanger core body assembly, and a brazing inhibitor is coated on the parts, which are contacted with the parts, of the assembling tool 10, the brazing tool and the positioning tool 11;
(8) and (4) placing the heat exchanger core in a vacuum brazing furnace for vacuum brazing.
The structural schematic diagram of the engine coiled pipe heat exchanger core is shown in fig. 1 and fig. 2, the engine coiled pipe heat exchanger core is composed of a lower plate 1, a partition plate 2, a coiled pipe 3, an upper plate 4, a cover plate 5, a joint 6 and an oil collecting plate 7, and the engine coiled pipe heat exchanger core is made of austenitic stainless steel. The A cavity channel 8 and the B cavity channel 9 are formed among the parts through vacuum brazing and argon arc welding, and the medium is circulated in the A cavity channel 8 and the B cavity channel 9 and is used for cooling high-temperature fuel gas entering between the partition plates.
The manufacture of the serpentine tube heat exchanger core of the engine has the following difficulties:
(1) difficulty in assembly: the heat exchanger core body has 2400 coiled pipes in total, the diameter of the coiled pipe 3 is 2.2mm, in order to ensure the brazing quality, the fit clearance among the coiled pipe 3, the upper plate 4, the lower plate 1 and the partition plate 2 needs to be controlled to be 0.05mm, the clearance is small, and the whole assembly difficulty is extremely high;
(2) controlling the deformation difficulty: the wall thickness of the partition boards 2 is only 1mm, high-temperature gas passes through a channel between the partition boards 2, the deformation of the partition boards 2 is required to be controlled, otherwise, the gas can generate larger flow resistance when passing through, and the product performance is influenced;
(3) welding difficulty: the brazing seams among 2400 coiled pipes 3, an oil collecting plate 7 and an upper plate 4 of the heat exchanger core body need to bear pressure of 6MPa, the wall thickness of the coiled pipes 3 is only 0.5mm, and pipelines are easy to corrode during brazing, so that products are scrapped;
5 passages are formed between the upper plate 4 and the cover plate 5, the passages cannot be connected in series when the pressure of the passages is 6MPa, the width of a brazing seam between the upper plate 4 and the cover plate 5 is only 2mm, and the brazing seam is invisible, so that brazing can not be supplemented, and the difficulty is high.
In order to solve the difficulty of brazing between the cover plate 5 and the upper plate 4, the structure of the cover plate 5 and the upper plate 4 is adjusted to a certain degree, the original butt joint is adjusted to be an overlap joint, as shown in fig. 5, the lap joint of the cover plate 5 and the upper plate 4 increases the brazing area and improves the strength of the joint; in addition, the lap joint of the cover plate 5 and the upper plate 4 transfers the invisible brazing seam into the visible brazing seam, and even if the brazing seam leaks, the leakage can be remedied by a method of supplementing the brazing.
After all the parts to be brazed are cleaned with kerosene and alcohol, the assembly fixture 10 having a guide cone is inserted into the serpentine tube 3. The heat exchanger core body has 2400 coiled pipes 3 in total, the diameters of the coiled pipes 3 are 2.2mm, in order to ensure the brazing quality, the fit clearance among the coiled pipes 3, the upper plate 4, the lower plate 1 and the partition plate 2 needs to be controlled to be 0.05mm, the clearance is small, and the whole assembly difficulty is extremely high; therefore, the assembly tool 10 is designed, the assembly tool 10 with the guide cone is inserted into the coiled pipe 3, then the lower plate 1, the partition plate 2, the upper plate 4 and the oil collecting plate 7 are sequentially assembled on the coiled pipe 3 through the guide cone of the assembly tool 10, an assembly component is obtained after assembly is completed, and then the assembly tool 10 is taken out of the coiled pipe 3. Through designing assembly fixture 10, make hypoplastron 1, baffle 2, upper plate 4, oil collecting plate 7 assemble with coiled pipe 3 through assembly fixture 10 respectively, guaranteed the fit clearance between coiled pipe 3 and upper plate 4, hypoplastron 1 and the baffle 2, reduced the assembly degree of difficulty.
Further, the brazing tool comprises first supporting blocks 13 arranged on two sides of the lower plate 1, second supporting blocks 14 used for supporting the upper plate 4 are arranged above the first supporting blocks 13, supporting strips 15 used for supporting the partition plate 2 are arranged on the inner sides of the second supporting blocks 14, and third supporting blocks 16 and fourth supporting blocks 17 used for supporting the oil collecting plate 7 assemblies are arranged above the second supporting blocks 14; a balancing weight 18 is arranged above the cover plate 5, and an aluminum silicate fiber 12 for protecting the coiled pipe 3 is arranged below the coiled pipe 3. Referring to fig. 6, it is a schematic view of the assembly of the brazing tool and the core of the coiled heat exchanger.
Referring to fig. 3, it is a schematic view of the assembly fixture of the present invention and the assembly of the serpentine pipe; further, one end of the assembly fixture 10 is in a straight pipe shape which can be inserted into the coiled pipe 3, and the end surface of the other end is a conical surface.
The assembly fixture 10 has a guide cone structure, specifically referring to fig. 3, the tail of a guide cone of the assembly fixture 10 is inserted into the serpentine tubes 3, the heat exchanger core is 2400 serpentine tubes 3 in total, the diameters of the serpentine tubes 3 are 2.2mm, the outer diameters of straight pipes of the guide cone of the assembly fixture 10 are matched with the diameters of the serpentine tubes 3, the assembly fixture 10 is inserted into each serpentine tube 3, then the lower plate 1, the partition plate 2, the upper plate 4 and the oil collecting plate 7 are assembled on the serpentine tubes 3 through the guide cone of the assembly fixture 10, the fit clearance between the serpentine tubes 3 and the upper plate 4, the lower plate 1 and the partition plate 2 is controlled to be 0.05mm, and the assembly fixture 10 is inserted into the serpentine tubes 3 to assemble the lower plate 1, the partition plate 2 and the upper plate 4, so that the fit clearance between the serpentine tubes 3 and the upper plate 4, the lower plate 1 and the partition plate 2 is ensured, and the assembly difficulty is reduced; meanwhile, the positioning tool 11 is designed, as shown in fig. 4, the upper end and the lower end of the positioning tool 11 are respectively contacted with the upper row of partition plates 2 and the lower row of partition plates 2 of the coiled pipes 3, the positioning tool 11 is uniformly assembled on each row of 2400 coiled pipes, and the two rows of partition plates 2 are respectively attached to the two ends of the positioning tool 11 during assembly, so that the assembly size between the partition plates 2 is ensured. Because the wall thickness of the partition plates 2 is only 1mm, the high-temperature gas passes through the channels between the partition plates 2, the deformation of the partition plates 2 is required to be controlled, otherwise, the gas can generate larger flow resistance when passing through, and the product performance is influenced; therefore, after the positioning tool 11 is assembled, the positioning tool 11 is put into a furnace along with the product for vacuum brazing, and the effect of controlling the deformation of the partition plate 2 can be achieved.
Further, the paste brazing filler metal in the step (3) and the step (6) is strip nickel-based paste brazing filler metal.
Further, after the argon arc welding spot welding positioning is adopted in the step (4), an oxide layer at the welding point is polished completely through a pneumatic air gun.
Further, when the oil collecting plate 7 assembly is welded by argon arc welding in the step (5), the welding wire is a stainless steel welding wire with the diameter of 1mm, the welding current is 50-80A, and the argon flow is 5-10L/min.
Further, the coating thickness of the solder resist in the step (7) is 0.1 mm.
Further, in the step (8), the heat exchanger core is placed in a vacuum brazing furnace, and vacuum brazing is performed according to the following parameters:
the cold state vacuum degree is 6-8 multiplied by 10 < -3 > Pa, and the working vacuum degree is 3-5 multiplied by 10 < -2 > Pa;
heating to 400-500 ℃ at the speed of 240-300 ℃/h, and keeping for 0.5-1 h;
heating to 800-950 ℃ at the speed of 300-360 ℃/h, and keeping for 2-3 h;
heating to 1000-1050 ℃ at the speed of 360-450 ℃/h, and keeping for 0.5-1 h;
after heating, carrying out vacuum cooling to 400-500 ℃ along with the furnace, and filling high-purity argon into the furnace;
and starting a fan to cool to below 100 ℃ after the pressure in the furnace reaches 6-8 multiplied by 104Pa, and discharging.
Further, after cooling and discharging, dismantling the brazing tool, polishing the brazing inhibitor remained on the heat exchanger core body assembly, and cleaning the heat exchanger core body assembly by using alcohol;
and (3) checking the size of the heat exchanger core assembly, and then carrying out a pressure test on the heat exchanger core assembly, wherein the test medium is purified water, the pressure is 6MPa, and the time is 20 min.
When the size of the heat exchanger core assembly is checked, the deformation of the lower plate 1, the partition plate 2, the upper plate 4 and the cover plate 5 is required to be not more than 0.2 mm; the pressure test is carried out on the core body of the heat exchanger, and the pipeline is required to be free from leakage and deformation.
The invention realizes the manufacture of the core body of the coiled tube heat exchanger by the manufacturing method of the core body of the coiled tube heat exchanger, the deformation of the lower plate 1, the partition plate 2, the upper plate 4 and the cover plate 5 is not more than 0.2mm, and the pipeline of a 6MPa pressure test has no leakage and deformation, thereby meeting the design requirements.
According to the technical scheme, the invention provides the manufacturing method of the coil heat exchanger core, the lower plate 1, the partition plate 2, the upper plate 4 and the oil collecting plate 7 are respectively assembled with the coil 3 through the assembly tool 10 by designing the assembly tool 10, so that the fit clearance between the coil 3 and the upper plate 4, between the lower plate 1 and the partition plate 2 is ensured, and the assembly difficulty is reduced; meanwhile, the positioning tool 11 is designed, and 2400 coiled pipes in each row are uniformly assembled; during assembly, the two rows of partition plates 2 are attached to each other through the positioning tool 11, the assembly size between the partition plates 2 is guaranteed, the positioning tool 11 enters a furnace along with a product for vacuum brazing, and the effect of controlling the deformation of the partition plates 2 can be achieved.
In order to solve the difficulty of brazing between the cover plate 5 and the upper plate 4, the structure of the cover plate 5 and the upper plate 4 is adjusted to a certain degree, the original butt joint is adjusted to be a lap joint, the brazing area is increased, and the joint strength is improved; in addition, the invisible brazing seam is transferred to the visible brazing seam, and even if the brazing seam leaks, the brazing seam can be repaired by a brazing filler metal repairing method; in order to control the deformation of parts, the invention also designs a brazing tool, aluminum silicate fibers 12 arranged below the coiled pipe 3 are used for protecting the coiled pipe 3, a first supporting block 13 is used for supporting the lower plate 1, a second supporting block 14 is used for supporting the upper plate 4, a third supporting block 16 and a fourth supporting plate are used for supporting the oil collecting plate 7 assembly, a supporting strip 15 is used for supporting the partition plate 2, and a balancing weight 18 arranged on the cover plate 5 is used for applying a certain force to a brazing seam of the upper plate 4 and the cover plate 5, so that the brazing seam strength is improved.
The embodiments given above are preferable examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical characteristics of the technical scheme of the invention by a person skilled in the art belong to the protection scope of the invention.
Claims (9)
1. A method for manufacturing a core of a serpentine tube heat exchanger, comprising the steps of:
(1) respectively processing a coiled pipe, a lower plate, an upper plate, a cover plate, an oil collecting plate and a plurality of partition plates, wherein the lower plate, the upper plate, the partition plates and the oil collecting plate are all provided with through holes matched with the outer diameter of the coiled pipe; lapping joints are processed on the upper plate and the cover plate, so that the upper plate and the cover plate can be lapped and assembled;
(2) after an upper plate, a cover plate, partition plates, an oil collecting plate and a lower plate are cleaned, an assembly tool with a guide cone is inserted into an opening at the upper end of each coiled pipe, the lower plate and the partition plates sequentially penetrate through the guide cones to be assembled on the coiled pipes under the guide of the assembly tool, and the positions between the lower plate and the partition plates are positioned through a positioning tool; assembling the upper plate above the partition plate through an assembling tool, positioning the upper plate and the partition plate through a positioning tool, obtaining an assembling assembly after assembling is completed, and taking the assembling tool out of the coiled pipe;
(3) uniformly coating and injecting paste-shaped brazing filler metal at the positions to be brazed of the coiled pipe and the upper plate;
(4) assembling a cover plate on an upper plate, performing spot welding positioning by adopting argon arc welding, and then polishing welding spots;
(5) welding the oil collecting plate and the joint into an oil collecting plate assembly by adopting argon arc welding, and assembling the oil collecting plate assembly onto the coiled pipe by using an assembling tool with a guide cone to obtain a heat exchanger core assembly;
(6) uniformly coating and injecting paste-shaped brazing filler metal at the positions to be brazed of the coiled pipe and the oil collecting plate assembly;
(7) a brazing tool is additionally arranged on the periphery of the heat exchanger core body assembly, and a brazing inhibitor is coated on the contact part of the assembly tool, the brazing tool and the positioning tool with the part;
(8) and (4) placing the heat exchanger core in a vacuum brazing furnace for vacuum brazing.
2. The method of manufacturing a serpentine tube heat exchanger core according to claim 1, wherein the brazing tool includes first support blocks disposed on both sides of the lower plate, a second support block disposed above the first support block for supporting the upper plate, a support bar disposed inside the second support block for supporting the partition plate, and third and fourth support blocks disposed above the second support block for supporting the oil collecting plate assembly; the top of the cover plate is provided with a balancing weight, and the lower part of the coiled pipe is provided with aluminum silicate fiber for protecting the coiled pipe.
3. A method of manufacturing a core for a serpentine tube heat exchanger according to claim 1, wherein one end of the fitting is formed in a straight tube shape which can be inserted into the serpentine tube, and an end surface of the other end is formed in a conical surface.
4. A method of manufacturing a serpentine heat exchanger core as defined in claim 1 wherein said paste filler metal of steps (3) and (6) is a strip of nickel-based paste filler metal.
5. The method of claim 1, wherein in step (4), after the positioning by argon arc spot welding, the oxide layer at the welding point is polished by a pneumatic air gun.
6. The manufacturing method of the coil heat exchanger core according to claim 3, wherein in the step (5), when the oil collecting plate assembly is welded by argon arc welding, the welding wire is a stainless steel welding wire with a diameter of 1mm, the welding current is 50-80A, and the argon flow is 5-10L/min.
7. A method of manufacturing a serpentine tube heat exchanger core as defined in claim 1 wherein the step (7) of applying a coating of the solder resist is performed to a thickness of 0.1 mm.
8. A method of manufacturing a serpentine tube heat exchanger core as defined in claim 1 wherein said step (8) of placing the heat exchanger core in a vacuum brazing furnace for vacuum brazing according to the following parameters:
the cold state vacuum degree is 6-8 multiplied by 10-3Pa, working vacuum degree of 3-5 × 10-2Pa；
Heating to 400-500 ℃ at the speed of 240-300 ℃/h, and keeping for 0.5-1 h;
heating to 800-950 ℃ at the speed of 300-360 ℃/h, and keeping for 2-3 h;
heating to 1000-1050 ℃ at the speed of 360-450 ℃/h, and keeping for 0.5-1 h;
after heating, carrying out vacuum cooling to 400-500 ℃ along with the furnace, and filling high-purity argon into the furnace;
the pressure in the furnace reaches 6 to 8 multiplied by 104And (4) starting a fan after Pa, cooling to below 100 ℃, and discharging.
9. The method of manufacturing a serpentine tube heat exchanger core according to claim 8, wherein after cooling out of the furnace, the brazing tool is removed, the brazing inhibitor remaining on the heat exchanger core assembly is polished clean, and the heat exchanger core assembly is cleaned with alcohol;
and (3) checking the size of the heat exchanger core assembly, and then carrying out a pressure test on the heat exchanger core assembly, wherein the test medium is purified water, the pressure is 6MPa, and the time is 20 min.
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| CN202110969406.0A CN113414558A (en) | 2021-08-23 | 2021-08-23 | Manufacturing method of coil heat exchanger core |
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| CN202110969406.0A CN113414558A (en) | 2021-08-23 | 2021-08-23 | Manufacturing method of coil heat exchanger core |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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