CN117840530A - Assembling, brazing and welding method for all-aluminum heat exchanger and all-aluminum heat exchanger - Google Patents
Assembling, brazing and welding method for all-aluminum heat exchanger and all-aluminum heat exchanger Download PDFInfo
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- CN117840530A CN117840530A CN202410030712.1A CN202410030712A CN117840530A CN 117840530 A CN117840530 A CN 117840530A CN 202410030712 A CN202410030712 A CN 202410030712A CN 117840530 A CN117840530 A CN 117840530A
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- aluminum
- heat exchanger
- brazing
- straight
- fins
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 125
- 238000005219 brazing Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000003466 welding Methods 0.000 title claims abstract description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 97
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 239000000654 additive Substances 0.000 claims abstract description 6
- 230000000996 additive effect Effects 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000005507 spraying Methods 0.000 claims abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 23
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 230000007797 corrosion Effects 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 6
- 239000012752 auxiliary agent Substances 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 239000007789 gas Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 11
- 230000007547 defect Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 16
- 229910052802 copper Inorganic materials 0.000 description 16
- 239000010949 copper Substances 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000005269 aluminizing Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to an assembling, brazing and welding method (1) for an all-aluminum heat exchanger, wherein aluminum fins are prepared according to the requirements of the heat exchanger; (2) flanging the inner holes of all the aluminum fins and then arranging; (3) Inserting a straight aluminum pipe with internal threads into the arranged aluminum fins, wherein the straight aluminum pipe penetrates through the inner holes of the aluminum fins and is tightly matched with the aluminum fins, and two ends of the straight threads are positioned outside the aluminum fins; (4) The end parts of two adjacent straight aluminum pipes are connected together through an elbow; (5) spraying a brazing aid on the core; (6) And (3) sending the core body sprayed with the brazing additive into a tunnel furnace for heating and cooling, and discharging. The invention has the advantages that: the aluminum pipe adopts the straight aluminum pipe and the elbow and various piping forms, and adopts the continuous brazing technology with the aluminum fins, so that all parts of the all-aluminum heat exchanger are in seamless brazing connection, the dilemma on resources, the defects of materials and assembly process defects are overcome, and the problem of resource recovery is solved.
Description
Technical Field
The invention relates to an assembly brazing welding method of an all-aluminum heat exchanger and the all-aluminum heat exchanger, and belongs to the field of heat exchangers.
Background
The current round tube heat exchanger of the air conditioner is formed by expanding and connecting small-caliber inner threaded copper tubes through aluminum fins.
Because the internal thread copper pipe and the aluminum fins are expanded together, two metals are assembled together through mechanical pressure contact essentially, and the connection affects heat conduction, so that the heat exchange performance of the heat exchanger is affected, and the following conditions exist:
1. copper pipes and aluminum fins are expanded together, so that the cost is too high when the copper and aluminum materials are recycled and decomposed in the later-stage waste air conditioner, the heat exchanger of the air conditioner is difficult to recycle, and unnecessary waste of resources is caused.
2. The air conditioner heat exchanger adopts a smaller-caliber aluminum pipe (for example, the diameter of 5 mm) to reduce the filling amount of the refrigerant, thereby further reducing the carbon emission and realizing green, environment-friendly and economic effects.
3. The small-caliber aluminum pipe has small internal space, and the aluminum and copper materials have large differences in hardness, ductility and other properties, so that the mass production is difficult to accomplish by using the pipe expanding process.
4. The internal thread aluminum pipe has strict requirements on parameters such as tooth height, advance angle, tooth number and the like of the internal thread, and the damage to a thread structure is unavoidable by adopting a pipe expanding process expansion head, so that the heat exchange performance of a heat exchanger is affected, and the energy efficiency of the whole air conditioner is reduced.
5. The aluminum material has larger difference in yield strength, tensile strength and elongation than red copper material, and is easy to tear at the outer side of a bending area by bending by adopting a traditional process, so that the whole service life of the air conditioner is influenced, and the aluminum material is a sign that the air conditioner is difficult to market in the prior all-aluminizing process.
In summary, aluminum is used for replacing copper in the whole air conditioning industry as a necessary trend of industry development, and the whole aluminizing design and production of the heat exchanger are of great importance, but because of the large difference of physical properties such as heat conducting property, material extensibility, strength and the like of copper-aluminum materials, a new subject is provided for the production process of the whole aluminum heat exchanger.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an assembling, brazing and welding method of an all-aluminum heat exchanger, which comprises the following steps:
an assembling, brazing and welding method for an all-aluminum heat exchanger comprises the following steps:
(1) Preparing aluminum fins according to the requirements of the heat exchanger;
(2) The inner holes of all aluminum fins are arranged after flanging;
(3) Inserting a straight aluminum pipe with internal threads into the well-arranged aluminum fins, wherein the straight aluminum pipe penetrates through the inner holes of the aluminum fins and is tightly matched with the aluminum fins, and two ends of the straight aluminum pipe with internal threads are positioned outside the aluminum fins;
(4) The end parts of two adjacent straight aluminum pipes are connected together through an elbow, and specifically: the upper end of one straight aluminum pipe is connected with the upper end of the last adjacent straight aluminum pipe through an elbow, the lower end of the straight aluminum pipe is connected with the lower end of the next adjacent straight aluminum pipe through an elbow to form a core, and all the elbows are integrally bent after being connected with all the straight aluminum pipes and are mutually communicated;
(5) Spraying a brazing auxiliary agent on the core body;
(6) And (3) sending the core body sprayed with the brazing additive into a tunnel furnace for heating and cooling, and discharging.
The step (7) is specifically as follows:
(7-1) placing the core body sprayed with the brazing additive on a conveying bracket, and fixing the core body;
(7-2) placing the conveying support with the core body on a circulating chain, and entering the tunnel furnace through the circulating chain;
(7-3) in the tunnel furnace, passing through a preheating zone, a high-temperature welding zone, a constant-temperature zone, a nitrogen protection zone and a strong wind cooling zone in sequence, and discharging.
In the tunnel furnace, the temperature of the preheating zone is 200-300 ℃; the temperature of the high-temperature welding area is 590-640 ℃; the temperature of the constant temperature area is 550-600 ℃; the temperature of the nitrogen protection zone is 300-400 ℃; the temperature of the strong wind cooling area is 30-60 ℃.
After the step (6), the method further comprises the steps of online nitrogen high-pressure leakage monitoring and helium vacuum leakage detection on the core body, wherein the pressure of the nitrogen high pressure is 12MP.
In the step (4), straight aluminum pipes with internal threads are connected through elbows, so that the wall thickness of the internal thread aluminum pipes for heat exchange is specifically as follows: the wall thickness of the bottom wall is 0.2-0.3mm, the tooth height is 0.15-0.25 mm, the pressure resistance and the corrosion resistance of the elbow part are increased, and the wall thickness of the pipe wall of the elbow part is 0.5-1.0 mm.
The all-aluminum heat exchanger is prepared by an assembling, brazing and welding method of the all-aluminum heat exchanger.
The invention has the advantages that:
the production process and the method are suitable for the all-aluminum heat exchanger, namely, the aluminum pipe adopts straight aluminum pipe with internal threads, an elbow and various piping forms, the aluminum pipe and the aluminum fins are connected together by utilizing a brazing technology, so that all parts of the all-aluminum heat exchanger are connected in a seamless brazing way, the problems of strength and damage to the internal threads caused by the traditional pipe expansion and bending process are solved, and the problems of heat transfer attenuation caused by poor connection between the aluminum pipe and the fins are also avoided. That is to say, the dilemma, the defects of the materials and the defects of the assembly process on the resources are solved, and the problem of resource recovery is solved. The original production process and method of the heat exchanger are completely broken, the production cost is saved, and the aims of synergy and carbon reduction are fulfilled. .
Drawings
FIG. 1 is a schematic structural view of an internally threaded straight aluminum pipe of the invention.
Fig. 2 is a schematic structural view of an all-aluminum elbow of the present invention.
Fig. 3 is a schematic structural view of an all-aluminum shaped elbow of the present invention.
Fig. 4 is a schematic structural view of an aluminum fin of the present invention.
Fig. 5 is a schematic structural view of the heat exchanger core of the present invention.
Fig. 6 is a schematic illustration of the present invention for spray-brazing a heat exchanger core with a flux.
Fig. 7 is a schematic view of the present invention with a core coated with a brazing flux placed on a holder.
Fig. 8 is a schematic view of the invention when the bracket is placed on the endless chain.
Fig. 9 is a schematic view of a core of the present invention passing through a preheating zone of a tunnel furnace.
Fig. 10 is a schematic view of a core of the present invention passing through a high temperature zone of a tunnel furnace.
Fig. 11 is a schematic view of a core of the present invention passing through a tunnel furnace weld zone.
Fig. 12 is a schematic view of a core of the present invention passing through a tunnel oven thermostatic zone.
Fig. 13 is a schematic view of a core of the present invention passing through a nitrogen protection zone of a tunnel furnace.
Fig. 14 is a schematic view of a core of the present invention passing through a strong wind cooling zone of a tunnel furnace.
Detailed Description
The invention will be further described with reference to specific embodiments, and advantages and features of the invention will become apparent from the description. These examples are merely exemplary and do not limit the scope of the invention in any way. It will be understood by those skilled in the art that various changes and substitutions of details and forms of the technical solution of the present invention may be made without departing from the spirit and scope of the present invention, but these changes and substitutions fall within the scope of the present invention.
Referring to fig. 1 to 14, the present invention relates to an assembling brazing welding method of an all-aluminum heat exchanger, comprising the steps of:
(1) According to the requirements of the heat exchanger, preparing aluminum fins, specifically:
(1-1) preparing a finished product internal thread aluminum straight pipe 3 with a brazing layer 1 and two end shrinkage heads 2 on the outer side of the pipe according to the requirements of a corresponding heat exchanger;
(1-2) preparing an all-aluminum elbow 4 according to the requirements of the corresponding heat exchanger;
(1-3) preparing all-aluminum special-shaped elbows 5 according to the requirements of corresponding heat exchangers;
(1-4) preparing aluminum fins 7 with flanges 6 according to the requirements of corresponding heat exchangers;
(2) The inner holes of all aluminum fins are arranged after flanging, specifically: arranging the required number of aluminum fins 7 (the turned edges are arranged in the same direction);
(3) Inserting a straight aluminum pipe with internal threads into an aluminum fin with a turned inner hole, wherein the straight aluminum pipe penetrates through the inner hole of the aluminum fin and is tightly matched with the aluminum fin, and two ends of the straight threads are positioned outside the aluminum fin;
(4) The end parts of two adjacent straight aluminum pipes are connected together through an elbow, and specifically: the upper end of one straight aluminum pipe is connected with the upper end of the last adjacent straight aluminum pipe through an elbow, the lower end of the straight aluminum pipe is connected with the lower end of the next adjacent straight aluminum pipe through an elbow to form a core body 8, and all the elbows are integrally arranged in a bending shape after being connected with all the straight aluminum pipes and are mutually communicated; the traditional process is to fold the internal thread aluminum pipe into a U-shaped pipe, then insert the U-shaped pipe into a fin, and connect the other end of the U-shaped pipe with an elbow, so that the external diameter part of the internal thread U-shaped pipe is easy to be damaged due to overlarge pulling during bending, and in order to ensure that the bending part has enough compression resistance and corrosion resistance, the wall thickness of the internal thread pipe is increased, thereby not only increasing the thermal resistance to influence the heat transmission, but also increasing the cost of materials. The wall thickness of the internal thread aluminum pipe for heat exchange can be similar to copper by adopting a process method for connecting two ends of the internal thread straight pipe, for example, the wall thickness of the bottom wall is 0.20mm, the tooth height is 0.15mm, and meanwhile, in order to increase the pressure resistance and the corrosion resistance of the elbow part, the wall thickness of the pipe wall of the elbow part can be 0.5mm-1.0mm, so that the heat transfer performance, the corrosion resistance and the pressure resistance of the internal thread aluminum pipe are considered, and meanwhile, the problem of material cost is also considered, and multiple purposes are achieved;
(5) Spraying a brazing auxiliary agent on the core body;
(6) And (3) sending the core body sprayed with the brazing additive into a tunnel furnace for heating and cooling, and discharging.
The step (7) is specifically as follows:
(7-1) placing the core body 8 sprayed with the brazing aid on a conveying support 9, and fixing the core body 8;
(7-2) the core-loaded transport support is placed on the endless chain 10 and is fed into the tunnel furnace through the endless chain;
(7-3) in the tunnel furnace, passing through a preheating zone, a high-temperature welding zone, a constant-temperature zone, a nitrogen protection zone and a strong wind cooling zone in sequence, and discharging.
In the tunnel furnace, the temperature of the preheating zone is 200-300 ℃; the temperature of the high-temperature welding area is 590-640 ℃; the temperature of the constant temperature area is 550-600 ℃; the temperature of the nitrogen protection zone is 300-400 ℃; the temperature of the strong wind cooling area is 30-60 ℃.
After the step (6), the method further comprises the steps of online nitrogen high-pressure leakage monitoring and helium vacuum leakage detection on the core body, wherein the pressure of the nitrogen high pressure is 12MP.
In the step (4), the straight aluminum pipes with internal threads are connected through the elbow, so that the wall thickness of the internal thread aluminum pipes for heat exchange is similar to copper, the pressure resistance and the corrosion resistance of the elbow part are increased, and the wall thickness of the pipe wall of the elbow part is 0.5-1.0 mm.
The invention also relates to an all-aluminum heat exchanger, which is prepared by the assembling, brazing and welding method of the all-aluminum heat exchanger.
In the invention, the heat exchange capacity comparison is carried out by adopting a heat exchanger with an internal thread copper pipe and an internal thread aluminum pipe which are both 5mm in diameter, and the experimental data comparison table of the round pipe aluminum fin heat exchanger with the diameter of 5mm and the full aluminum heat exchanger is shown in the table 1.
TABLE 1
For convenience of comparison, the design parameters of the internal thread copper pipe and the internal thread aluminum pipe are the same, namely the number of teeth is 37, the tooth height is 0.15mm, the helix angle is 20 ℃, and the bottom wall thickness is 0.2mm.
The experimental numbers 1 to 5 refer to heat exchanger performance tests performed under simulated different environment temperatures, namely five different inlet temperatures and outlet temperatures of the heat exchanger, and according to comparative analysis of measured data, it can be seen that the whole aluminum heat exchanger produced by adopting the new process has almost the same whole heat exchange capacity as the copper tube aluminum fin heat exchanger under the whole working condition, the main reason is that a brazing process is adopted between the internal thread aluminum tube and the fins, seamless connection is realized, gaps caused by mechanical contact between copper and aluminum are avoided, heat resistance is increased, and meanwhile, under the conditions of the same screw number, the same screw angle and the same tooth height, due to the expansion joint process adopted between the internal thread copper tube and the aluminum fins, the tooth heights are reduced to a certain extent, the puncture effect of refrigerant bubbles in the tube by the tooth tops is weakened, and although the heat conductivity of copper is higher than that of aluminum, the adverse factors are combined together, and the heat transfer effect of the copper tube aluminum fins is reduced.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (6)
1. The assembling, brazing and welding method for the all-aluminum heat exchanger is characterized by comprising the following steps of:
(1) Preparing aluminum fins according to the requirements of the heat exchanger;
(2) The inner holes of all aluminum fins are arranged after flanging;
(3) Inserting a straight aluminum pipe with internal threads into the arranged aluminum fins, wherein the straight aluminum pipe penetrates through the inner holes of the aluminum fins and is tightly matched with the aluminum fins, and two ends of the straight threads are positioned outside the aluminum fins;
(4) The end parts of two adjacent straight aluminum pipes are connected together through an elbow, and specifically: the upper end of one straight aluminum pipe is connected with the upper end of the last adjacent straight aluminum pipe through an elbow, the lower end of the straight aluminum pipe is connected with the lower end of the next adjacent straight aluminum pipe through an elbow to form a core, and all the elbows are integrally bent after being connected with all the straight aluminum pipes and are mutually communicated;
(5) Spraying a brazing auxiliary agent on the core body;
(6) And (3) sending the core body sprayed with the brazing additive into a tunnel furnace for heating and cooling, and discharging.
2. The method for assembling, brazing and welding an all-aluminum heat exchanger according to claim 1, wherein the step (7) is specifically:
(7-1) placing the core body sprayed with the brazing additive on a conveying bracket, and fixing the core body;
(7-2) placing the conveying support with the core body on a circulating chain, and entering the tunnel furnace through the circulating chain;
(7-3) in the tunnel furnace, passing through a preheating zone, a high-temperature welding zone, a constant-temperature zone, a nitrogen protection zone and a strong wind cooling zone in sequence, and discharging.
3. The method for assembling, brazing and welding an all-aluminum heat exchanger according to claim 2, wherein the temperature of the preheating zone is 200 ℃ to 300 ℃ in the tunnel furnace; the temperature of the high-temperature welding area is 590-640 ℃; the temperature of the constant temperature area is 550-600 ℃; the temperature of the nitrogen protection zone is 300-400 ℃; the temperature of the strong wind cooling area is 30-60 ℃.
4. The method for assembling, brazing and welding an all-aluminum heat exchanger according to claim 3, further comprising the step of monitoring the core by online leakage of nitrogen gas under a pressure of 12MP and vacuum leakage of helium gas after the step (6).
5. The method for assembling, brazing and welding an all-aluminum heat exchanger according to claim 3, wherein in the step (4), straight aluminum pipes with internal threads are connected by a bend, and the wall thickness of the internal threaded aluminum pipes for heat exchange is specifically: the wall thickness of the bottom wall is 0.2mm-0.3mm, the tooth height is 0.15mm-0.25mm, the pressure resistance and the corrosion resistance of the elbow part are increased, and the wall thickness of the pipe wall of the elbow part is 0.5mm-1.0mm.
6. An all-aluminum heat exchanger, characterized by being produced by the assembling brazing welding method of an all-aluminum heat exchanger according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410030712.1A CN117840530A (en) | 2024-01-09 | 2024-01-09 | Assembling, brazing and welding method for all-aluminum heat exchanger and all-aluminum heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410030712.1A CN117840530A (en) | 2024-01-09 | 2024-01-09 | Assembling, brazing and welding method for all-aluminum heat exchanger and all-aluminum heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117840530A true CN117840530A (en) | 2024-04-09 |
Family
ID=90539561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410030712.1A Pending CN117840530A (en) | 2024-01-09 | 2024-01-09 | Assembling, brazing and welding method for all-aluminum heat exchanger and all-aluminum heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117840530A (en) |
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- 2024-01-09 CN CN202410030712.1A patent/CN117840530A/en active Pending
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