Integrated all-aluminum heat exchanger and manufacturing method thereof

Abstract

The invention provides an integrated all-aluminum heat exchanger and a manufacturing method thereof. The method comprises the steps that a straight aluminum pipe is arranged on an aluminum fin in a penetrating mode, and an initial fin penetrating assembly is obtained; wherein the pipe wall of the straight aluminum pipe is in clearance fit with the inner hole of the aluminum fin; a brazing auxiliary is sprayed to the initial sheet penetrating assembly, and a to-be-welded sheet penetrating assembly is obtained; a pipe end connecting piece is connected to the to-be-welded fin penetrating assembly, and a to-be-welded core body is obtained; wherein the pipe end connecting piece at least comprises an elbow; and the core body to be welded is subjected to furnace brazing treatment. The heat dissipation efficiency / cold transfer efficiency of the aluminum fins is guaranteed, and then the heat dissipation efficiency / cold transfer efficiency of refrigerants on the inner sides of the straight aluminum pipes is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchangers, in particular to an integrated all-aluminum heat exchanger and a manufacturing method thereof. BACKGROUND

[0002] In the manufacturing process of a conventional all-aluminum heat exchanger, aluminum tubes and aluminum fins are assembled through an expansion process. In the expansion process, due to the low yield strength and high ductility of aluminum, the expansion pressure easily causes non-uniform plastic flow of the inner helical tooth structure of the tube, resulting in tooth top fin reversal and tooth height thinning, which increases the fluid boundary layer thickness and the speed field and temperature field coordination angle, and weakens the convective heat transfer strength. At the same time, the aluminum-aluminum interface formed by the expansion process has a limited actual contact area, and a large number of microscopic gaps make the heat flow path dispersed and tortuous, which weakens the heat conduction efficiency. When the contact thermal resistance accounts for a certain proportion in the total thermal resistance, the heat dissipation efficiency of the fin is greatly reduced, and the synergy of the temperature field and the fluid velocity field is destroyed, weakening the convective heat transfer effect. This performance degradation is more obvious under high flow rate conditions. SUMMARY

[0003] In view of the above problems, the present application is proposed to provide a manufacturing method of an integrated all-aluminum heat exchanger which overcomes the above problems or at least partially solves the above problems.

[0004] An object of the present application is to solve the problem of large contact thermal resistance caused by the assembly of aluminum tubes and aluminum fins using an expansion process, so as to achieve the effect of improving the heat transfer performance of the heat exchanger.

[0005] Specifically, the present application provides a manufacturing method of an integrated all-aluminum heat exchanger, which comprises:

[0006] a straight aluminum tube is fitted on an aluminum fin to obtain an initial fin fitting assembly; wherein the tube wall of the straight aluminum tube and the inner hole gap of the aluminum fin are fitted;

[0007] a brazing aid is sprayed on the initial fin fitting assembly to obtain a fin fitting assembly to be welded;

[0008] a pipe end connector is connected to the fin fitting assembly to be welded to obtain a core to be welded; wherein the pipe end connector comprises at least an elbow;

[0009] the core to be welded is subjected to furnace brazing treatment.

[0010] Optionally, the step of manufacturing the straight aluminum tube comprises:

[0011] an aluminum strip is prepared;

[0012] an inner thread development pattern is pressed on one side of the aluminum strip to obtain a patterned aluminum strip;

[0013] the patterned aluminum strip is wound into a tube shape to obtain a seamed aluminum tube;

[0014] welding the interface gap of the slitted aluminum pipe to obtain the straight aluminum pipe.

[0015] Optionally, the step of preparing the aluminum strip comprises:

[0016] preparing a light foil in a strip shape;

[0017] spraying a first coating material on at least one side of the light foil to obtain the aluminum strip; wherein the first coating material at least comprises an anticorrosive material, and the first coating material is at least located on the side for pressing the inner thread development lines.

[0018] Optionally, after the furnace brazing treatment of the to-be-welded core, further comprising:

[0019] immersing the brazing core in a second coating material, wherein the brazing core is obtained after the furnace brazing treatment of the to-be-welded core, and the second coating material comprises an anticorrosive material and / or a hydrophilic material.

[0020] Optionally, before immersing the brazing core in the second coating material, further comprising:

[0021] performing a leak detection treatment on the brazing core.

[0022] Optionally, before connecting the pipe end connector on the to-be-welded core assembly, further comprising:

[0023] performing a drying treatment on the to-be-welded core assembly.

[0024] Optionally, the drying treatment on the to-be-welded core assembly comprises:

[0025] in the case of heating and drying the to-be-welded core assembly, drawing air outward from both ends of the to-be-welded core assembly to promote the enrichment of the brazing aid in the straight aluminum pipes at the pipe ends in the to-be-welded core assembly.

[0026] Optionally, connecting the pipe end connector on the to-be-welded core assembly comprises:

[0027] inserting the pipe ends of the straight aluminum pipes in the to-be-welded core assembly into the ports of the elbow; and / or,

[0028] in the case that the pipe end connector further comprises a distributor, inserting the pipe ends of the straight aluminum pipes in the to-be-welded core assembly into the ports of the distributor.

[0029] Optionally, spraying the brazing aid on the initial core assembly comprises:

[0030] The initial piercing assembly is periodically tilted to cause the straight aluminum tube in the initial piercing assembly to periodically tilt.

[0031] The application also provides an integrated full-aluminum heat exchanger comprising a straight aluminum tube, an aluminum fin and a tube end connector connected by the manufacturing method of any one of the above, wherein the tube end connector comprises at least one elbow socketed on the tube end of the straight aluminum tube.

[0032] In the integrated full-aluminum heat exchanger and the manufacturing method thereof, the aluminum fin and the straight aluminum tube are gap-fitted when they are fitted together, the sprayed soldering aid can enter the gap between the two, the aluminum fin and the straight aluminum tube can be fully contacted, there is basically no micro gap, a good heat dissipation path is formed, the thermal resistance is reduced, the heat conduction efficiency is improved, the heat dissipation / cooling efficiency of the aluminum fin is ensured, and the heat dissipation / cooling efficiency of the refrigerant inside the straight aluminum tube is ensured. Moreover, the structure inside the straight aluminum tube, such as the helical tooth structure, is not damaged, the fluid boundary layer thickness is prevented from being increased, the speed field and temperature field synergy angle is prevented from being increased, the convective heat transfer strength is prevented from being weakened, and the heat dissipation / cooling efficiency of the refrigerant in the straight aluminum tube to the outside is ensured.

[0033] Further, in the integrated full-aluminum heat exchanger and the manufacturing method thereof, the soldering aid is sprayed first, and then the tube segment connector is inserted, so that the straight aluminum tube end part has the soldering aid, and the soldering aid is inside the tube segment connector, the connection performance and sealing performance of the straight aluminum tube and the tube segment connector are ensured, the yield of the integrated full-aluminum heat exchanger is ensured, and the production cost is reduced as a whole.

[0034] Moreover, the integrated full-aluminum heat exchanger made of full-aluminum material has consistency in material, ensures the overall heat exchange efficiency, and has low cost.

[0035] The above and other objects, advantages and features of the application will become more apparent from the following detailed description of some embodiments thereof, when considered in conjunction with the attached drawings. BRIEF DESCRIPTION OF DRAWINGS

[0036] Some specific embodiments of the application will be described in detail below with reference to the attached drawings. The same reference numerals in the drawings denote the same or similar components or parts. It should be understood by those skilled in the art that the drawings are not necessarily drawn to scale. In the drawings:

[0037] Figure 1 is a schematic flow chart of a manufacturing method of an integrated full-aluminum heat exchanger according to an embodiment of the application;

[0038] Figure 2This is a schematic flowchart illustrating the manufacturing of straight aluminum tubes in a method for manufacturing an integrated all-aluminum heat exchanger according to an embodiment of the present invention.

[0039] Figure 3 This is a schematic flowchart illustrating the preparation of aluminum strips in a method for manufacturing an integrated all-aluminum heat exchanger according to an embodiment of the present invention. Detailed Implementation

[0040] The following reference Figures 1 to 3 This invention describes an integrated all-aluminum heat exchanger and its manufacturing method according to embodiments of the present invention. In this description, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0041] Unless otherwise expressly specified and limited, the terms "set up," "install," "connect," "link," "fix," and "couple" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] Furthermore, in the description of this embodiment, "above" or "below" the second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. That is, in the description of this embodiment, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "below" of the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of the present embodiments, references to "an embodiment", "some embodiments", "certain embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the present disclosure. The appearances of the phrases in various places in the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0044] Figure 1 is a schematic flow chart of a manufacturing method of an integrated all-aluminum heat exchanger according to an embodiment of the present disclosure, as shown in Figure 1 The present embodiment provides a manufacturing method of an integrated all-aluminum heat exchanger, which comprises:

[0045] In step S100, a straight aluminum tube is fitted on an aluminum fin to obtain an initial fin-fitted assembly; wherein the tube wall of the straight aluminum tube and the inner hole of the aluminum fin are in clearance fit.

[0046] In step S200, a brazing aid is sprayed on the initial fin-fitted assembly to obtain a fin-fitted assembly to be brazed.

[0047] In step S300, a tube end connector is connected on the fin-fitted assembly to be brazed to obtain a core to be brazed; wherein the tube end connector at least comprises an elbow.

[0048] In step S400, the core to be brazed is subjected to furnace brazing treatment.

[0049] In the present embodiment, when the aluminum fin and the straight aluminum tube are fitted, they are in clearance fit, the sprayed brazing aid can enter the clearance between the two, the aluminum fin and the straight aluminum tube can be in full contact, there is basically no micro-clearance, a good heat dissipation path is formed, the thermal resistance is reduced, the heat conduction efficiency is improved, the heat dissipation / cooling efficiency of the aluminum fin is ensured, and then the heat dissipation / cooling efficiency of the refrigerant inside the straight aluminum tube is ensured. Moreover, the structure inside the straight aluminum tube, such as the helical tooth structure, will not be damaged, the fluid boundary layer thickness will not be increased, the velocity field and temperature field coordination angle will not be increased, the convective heat transfer strength will not be weakened, and the heat dissipation / cooling efficiency of the refrigerant inside the straight aluminum tube to the outside is ensured.

[0050] Further, in the present embodiment, the brazing aid is sprayed first, and then the tube segment connector is inserted, so that the straight aluminum tube end part has the brazing aid, and the brazing aid is inside the tube segment connector, the connection performance and sealing performance of the straight aluminum tube and the tube segment connector are ensured, the yield of the integrated all-aluminum heat exchanger is ensured, and thus the overall production cost is reduced.

[0051] Moreover, the one-piece full-aluminum heat exchanger made of full-aluminum material has consistency, ensures the overall heat exchange efficiency, and has low cost.

[0052] In some embodiments of the present application, the straight aluminum pipe and the aluminum fin are in clearance fit, and the clearance of the two is within 1mm. The clearance fit can also prevent the straight aluminum pipe and the aluminum fin from being squeezed and damaged when they are fitted.

[0053] In some embodiments of the present application, as shown in Figure 2 The steps of manufacturing the straight aluminum pipe include:

[0054] Step S110, preparing an aluminum strip.

[0055] Step S120, pressing an inner thread unfolding pattern on one side of the aluminum strip to obtain a threaded aluminum strip.

[0056] Step S130, winding the threaded aluminum strip into a tube shape to obtain a seamed aluminum pipe.

[0057] Step S140, welding the joint gap of the seamed aluminum pipe to obtain a straight aluminum pipe.

[0058] In the embodiments of the present application, the inner structure of the straight aluminum pipe is formed by pressing on the aluminum strip, which is easy to process and can ensure the size and shape of the inner structure, so that the straight aluminum pipe with simple inner structure is manufactured with high quality. Moreover, the aluminum pipe is formed by welding, which does not affect the inner structure of the straight aluminum pipe, and is beneficial to ensure the stability of the inner structure of the straight aluminum pipe, and the inner structure is not easily damaged.

[0059] In some embodiments of the present application, as shown in Figure 3 The step of preparing the aluminum strip includes:

[0060] Step S101, preparing a light aluminum foil in strip shape.

[0061] Step S102, spraying a first coating material on at least one side of the light aluminum foil to obtain an aluminum strip. The first coating material at least includes corrosion-resistant material, and the first coating material is at least located on the side for pressing the inner thread unfolding pattern.

[0062] In the embodiments of the present application, the first coating material is sprayed on the inner side of the light foil instead of being sprayed in the shaped straight aluminum pipe, so that the first coating material is uniformly distributed on the inner side of the straight aluminum pipe, preventing uneven distribution of the first coating material on the inner side of the straight aluminum pipe. Moreover, the scheme of spraying first and then pressing can ensure that the bottom of the inner structure groove also has the first coating material, ensuring the performance of the straight aluminum pipe. Specifically, corrosion protection can be performed to avoid corrosion perforation failure and prolong the service life of the straight aluminum pipe; corrosion products can be prevented from depositing to stabilize fluid dynamics and thus maintain heat exchange efficiency; the refrigerant can be prevented from being contaminated to ensure the quality of the entire air conditioner and reduce maintenance costs.

[0063] In some embodiments of the present application, before the inner thread development pattern is pressed on one side of the aluminum strip to obtain the textured aluminum strip, oil is sprayed on the side of the aluminum strip that needs to be pressed with the inner thread. The oil can reduce the friction between the aluminum material and the processing equipment (such as the mold and the roller), prevent surface scratching or wear, ensure smooth processing, and prolong the service life of the mold. The heat generated during processing can cause the aluminum pipe to deform or the material properties to change. The oil agent can absorb part of the heat, act as a cooling agent, and maintain the stability of the processing temperature. Spraying oil can isolate air, reduce the risk of oxidation, keep the surface clean, and provide better substrate conditions for subsequent processes. Further, after obtaining the textured aluminum strip, drying and cleaning can be further performed.

[0064] In some embodiments of the present application, because the interface gap of the seamed aluminum pipe is welded, a brazing aid is sprayed at least on the position that needs to be welded before the textured aluminum strip is wound into a pipe shape to obtain the seamed aluminum pipe. In some embodiments of the present application, the brazing aid can be sprayed on at least one side of the textured aluminum strip. In some embodiments of the present application, the brazing aid can be sprayed on the two abutting edges of the textured aluminum strip, specifically on the outer surface, the inner surface, and the abutting surface of the edges.

[0065] In some embodiments of the present application, the interface gap of the seamed aluminum pipe is welded to obtain the straight aluminum pipe by using high-frequency welding. After obtaining the straight aluminum pipe, processes such as coiling, straightening, cutting, collecting / packaging, etc. can be performed.

[0066] In some embodiments of the present application, the manufacturing method of the integrated all-aluminum heat exchanger further includes aluminum fin manufacturing, specifically, aluminum fin forming can be performed on a punching machine.

[0067] In some embodiments of the present application, the step of inserting the straight aluminum pipe into the aluminum fin to obtain the initial finned assembly includes:

[0068] The aluminum fins are taken out and placed in a row.

[0069] Prevent the tube plate from the outside of both ends of the row of aluminum fins. The tube plate can also be made of aluminum material.

[0070] The straight aluminum tube is worn on the aluminum fin.

[0071] The aluminum fin, the straight aluminum tube and the tube plate are bundled by using a bundling machine to obtain an initial fin assembly. Bundling ensures the positional relationship between the aluminum fin, the straight aluminum tube and the tube plate.

[0072] In some embodiments of the present application, before the soldering aid is sprayed on the initial fin assembly, the initial fin assembly is further subjected to a degreasing treatment in a degreasing furnace. Degreasing treatment can remove grease and dirt, which can hinder the wetting and spreading of the solder, resulting in weak welds or porosity defects. Degreasing treatment can improve the wettability of the solder, and a clean surface can ensure that the soldering aid flows sufficiently and forms a metallurgical bond with the base material, avoiding virtual welding or incomplete penetration. Porosity and slag inclusions can be prevented, as grease can decompose to form gas at high temperatures, resulting in weld porosity; residues can also form slag inclusions, reducing joint strength, and degreasing can remove grease. After degreasing treatment, the surface is uniform, facilitating uniform coverage of the subsequent soldering aid and improving the consistency of soldering.

[0073] In some embodiments of the present application, the soldering aid is sprayed on the initial fin assembly by using a spraying machine.

[0074] In some embodiments of the present application, the soldering aid is sprayed on the initial fin assembly, including: periodically pitching the initial fin assembly while maintaining the spraying of the soldering aid on the initial fin assembly, to promote the periodic pitching of the straight aluminum tube in the initial fin assembly. The tilting of the straight aluminum tube allows the soldering aid to flow through the mating gap with the fin, while also accumulating at the tube end, improving the reliability of the connection with the elbow.

[0075] In some embodiments of the present application, before the tube end connector is connected to the to-be-welded fin assembly, the to-be-welded fin assembly is further subjected to a drying treatment. The drying machine can be used for drying.

[0076] In some embodiments of the present application, the to-be-welded fin assembly is subjected to a drying treatment, including:

[0077] In the case of heating and drying the to-be-welded fin assembly, air is extracted from both ends of the to-be-welded fin assembly outward, to promote the accumulation of the soldering aid at the tube end of the straight aluminum tube in the to-be-welded fin assembly. The extraction of air can cause the soldering aid on the tube segment exposed from the aluminum fin on the straight aluminum tube to accumulate at the tube end, improving the reliability of the connection with the elbow, or to accumulate at the position where the straight aluminum tube and the aluminum fin intersect, improving the reliability of the connection between the straight aluminum tube and the aluminum fin.

[0078] In some embodiments of the present application, the tube end connector is connected to the to-be-welded fin assembly, including:

[0079] inserting the tube end of the straight aluminum tube in the tube end connector into the port of the manifold; and / or,

[0080] inserting the tube end of the straight aluminum tube in the tube end connector into the port of the manifold. The connecting of the tube end connector on the tube end assembly can be performed manually.

[0081] In some embodiments of the present application, the tube end assembly is subjected to a furnace brazing process in a brazing furnace.

[0082] In some embodiments of the present application, as shown in FIG. 4, after the furnace brazing process of the tube end assembly, i.e. after step S400, the method further comprises: Figure 1

[0083] S600, immersing the brazed tube end assembly in a second coating material. The brazed tube end assembly is obtained after the furnace brazing process of the tube end assembly. The second coating material comprises an anticorrosive material and / or a hydrophilic material. The immersing can be performed in an immersion tank. The hydrophilic layer on the surface of the heat exchanger can improve the heat transfer efficiency, prevent corrosion, inhibit bacteria, and prolong the service life of the equipment. The hydrophilic layer makes the water form a uniform water film (rather than water droplets) on the surface of the heat exchanger, increases the heat transfer area, and accelerates the evaporation or condensation rate. In wet working conditions (such as air conditioning condensers), the hydrophilic layer prevents the condensate water droplets from gathering to form a "water bridge", reduces the air flow resistance, and reduces the energy consumption of the fan. The water film on the surface of the hydrophilic layer can wash away part of the impurities and slow down the rate of fouling. Some hydrophilic coatings contain corrosion-resistant components that can isolate the aluminum substrate from corrosive media and inhibit electrochemical corrosion. Some high-end hydrophilic coatings add silver ions, nano-TiO2, and other antibacterial agents to prevent algae and mold from proliferating on the wet surface and to prevent biological fouling from blocking the flow path. The hydrophilic layer can promote the uniform distribution of frost, shorten the defrosting time, and improve the heating efficiency of the heat pump in winter.

[0084] In some embodiments of the present application, as shown in FIG. 6, after immersing the brazed tube end assembly in the second coating material, i.e. after step S600, the method further comprises: Figure 1

[0085] Step S700, drying the brazed tube end assembly immersed in the second coating material. The adhesion, durability, and hydrophilic properties of the second coating material can be improved, and the coating can be prevented from being loose and easy to fall off, and the hydrophilic properties of the coating can be prevented from decaying quickly and the corrosion resistance can be poor.

[0086] In some embodiments of the present application, as shown in FIG. 4, after the furnace brazing process of the tube end assembly, i.e. after step S400, the method further comprises: Figure 1

[0087] ​​​Step S500, leak detection treatment is performed on the brazing core. Specifically, nitrogen high-pressure leakage monitoring and helium vacuum leak detection can be performed.

[0088] In some embodiments of the present application, as shown in Figures 1 to 3 The manufacturing method of the integrated all-aluminum heat exchanger comprises the following steps:

[0089] The aluminum pipe processing step can be, specifically, uncoiling, oil spraying, inner thread pressing, drying, cleaning, brazing aid spraying, high-frequency welding, coiling, straightening, cutting, collecting / packaging, etc. The above steps S110, S120, S130, S140 can be included.

[0090] The aluminum fin is formed by a punching machine.

[0091] An initial finned assembly is made. That is, the above step S100.

[0092] The initial finned assembly is subjected to a degreasing treatment in a degreasing furnace.

[0093] The brazing aid is sprayed on the initial finned assembly. That is, the above step S200.

[0094] The to-be-welded finned assembly is subjected to a drying treatment by a drying machine.

[0095] The tube end connector is connected to the to-be-welded finned assembly to obtain a brazing core. That is, the above step S300.

[0096] The brazing core is subjected to a furnace brazing treatment to obtain a brazing core. That is, the above step S400.

[0097] The brazing core is subjected to a leak detection treatment. That is, the above step S500.

[0098] The brazing core is soaked in a second coating material. That is, the above step S600.

[0099] The brazing core soaked in the second coating material is subjected to a drying chemical bond. That is, the above step S700.

[0100] The embodiment of the present application proposes an advanced integrated all-aluminum heat exchanger production process, which adopts straight aluminum pipe inner thread pressing forming and then coiling and welding, and adopts welding between the straight aluminum pipe and the aluminum fin to eliminate contact thermal resistance, etc., which greatly improves the performance of the aluminum heat exchanger.

[0101] The integrated all-aluminum heat exchanger manufactured by the manufacturing method of the integrated all-aluminum heat exchanger of the embodiment of the present application has the following advantages compared with the traditional heat exchanger with traditional expansion, taking the condenser of a 35 machine as an example:

[0102]

[0103] In summary, taking the 35 machine as an example, the integrated all-aluminum heat exchanger of the application has a cost reduction of 10 yuan per unit compared with the traditional heat exchanger, and the heat transfer efficiency of the heat exchanger is improved by 15%.

[0104] The embodiment of the application also provides an integrated all-aluminum heat exchanger, which comprises straight aluminum pipes, aluminum fins and pipe end connectors connected by the manufacturing method of any of the above embodiments, wherein the pipe end connector comprises at least one elbow sleeved on the pipe end of the straight aluminum pipe.

[0105] The integrated all-aluminum heat exchanger of the embodiment of the application has the aluminum fins and the straight aluminum pipes substantially completely in contact, substantially no micro gap, forms a good heat dissipation path, reduces the thermal resistance, improves the heat conduction efficiency, guarantees the heat dissipation efficiency / cold conduction efficiency of the aluminum fins, and further guarantees the heat dissipation efficiency / cold conduction efficiency of the refrigerant inside the straight aluminum pipe. The structure inside the straight aluminum pipe is complete and is not damaged, which can prevent the increase of the fluid boundary layer thickness, prevent the increase of the synergy angle of the velocity field and the temperature field, prevent the weakening of the convective heat transfer intensity, and guarantee the heat dissipation / cold conduction efficiency of the refrigerant inside the straight aluminum pipe to the outside. The connection performance and the sealing performance of the straight aluminum pipe and the pipe segment connector are excellent, which guarantees the yield of the integrated all-aluminum heat exchanger, thereby reducing the production cost as a whole. Moreover, the integrated all-aluminum heat exchanger made of all-aluminum material has consistency in material, guarantees the overall heat transfer efficiency, and has low cost.

[0106] At this point, those skilled in the art should recognize that although the present application has been shown and described in detail in the above embodiments, many other variations or modifications can be directly determined or deduced according to the disclosure of the present application without departing from the spirit and scope of the present application. Therefore, the scope of the present application should be understood and recognized as covering all these other variations or modifications.

Claims

1. A method for manufacturing an integrated all-aluminum heat exchanger, characterized in that, include: A straight aluminum tube is threaded onto an aluminum fin to obtain an initial fin assembly; wherein the tube wall of the straight aluminum tube and the inner hole of the aluminum fin are fitted with a clearance. Spraying brazing flux onto the initial bonding assembly yields the bonding assembly to be soldered; A tube end connector is connected to the welding plate assembly to obtain the core body to be welded; wherein the tube end connector includes at least an elbow. The core to be welded is then subjected to furnace brazing.

2. The manufacturing method according to claim 1, characterized in that, The steps for manufacturing the straight aluminum tube include: Prepare aluminum strip; An internal thread pattern is pressed onto one side of an aluminum strip to obtain a textured aluminum strip. The textured aluminum strip is wound into a tubular shape to obtain a slotted aluminum tube; The joint gap of the seamed aluminum tube is welded to obtain the straight aluminum tube.

3. The manufacturing method according to claim 2, characterized in that, The steps for preparing aluminum strip include: Prepare strips of optical foil; The aluminum strip is obtained by spraying a first coating material onto at least one side of the foil; wherein the first coating material includes at least an anti-corrosion material, and the first coating material is located at least on the side used to press the internal thread development pattern.

4. The manufacturing method according to claim 1, characterized in that, After performing furnace brazing on the core to be welded, the process further includes: The brazing core is immersed in a second coating material, wherein the brazing core is obtained by brazing the core to be brazed in the furnace, and the second coating material includes anti-corrosion material and / or hydrophilic material.

5. The manufacturing method according to claim 4, characterized in that, Before immersing the brazed core in the second coating material, the process also includes: Leak detection is performed on the brazed core.

6. The manufacturing method according to claim 1, characterized in that, Before connecting the tube end connector to the welding assembly, the following is also included: The assembly to be soldered is then dried.

7. The manufacturing method according to claim 6, characterized in that, The drying process for the assembly to be soldered includes: While the brazing assembly is being heated and dried, air is drawn out from both ends of the assembly to promote the accumulation of the brazing flux at both ends of the straight aluminum tube in the assembly.

8. The manufacturing method according to claim 1, characterized in that, The tube end connector is connected to the welding assembly, including: Insert the end of the straight aluminum tube in the welding assembly into the port of the elbow; and / or, If the tube end connector also includes a distributor, the tube end of the straight aluminum tube in the welding assembly is inserted into the port of the distributor.

9. The manufacturing method according to claim 1, characterized in that, Spraying a brazing flux onto the initial filament assembly includes: While continuing to spray the brazing flux onto the initial tinning assembly, the initial tinning assembly is periodically pitched and shaken to cause the straight aluminum tube in the initial tinning assembly to periodically pitch and tilt.

10. An integrated all-aluminum heat exchanger, characterized in that, The invention includes a straight aluminum tube, aluminum fins, and tube end connectors connected by the manufacturing method as described in any one of claims 1 to 9, wherein the tube end connectors include at least one elbow fitted onto the tube end of the straight aluminum tube.

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