WO2017059785A1

WO2017059785A1 - Wavy fin type heat exchanger and manufacturing method thereof

Info

Publication number: WO2017059785A1
Application number: PCT/CN2016/100971
Authority: WO
Inventors: 谢彦君
Original assignee: 谢彦君
Priority date: 2015-10-07
Filing date: 2016-09-30
Publication date: 2017-04-13

Abstract

A heat exchanger, comprising flat tubes (1), fins (2) and liquid collection chambers (3), wherein the flat tubes (1) and the fins (2) are arranged at intervals; two sides of the fins (2) between two flat tubes (1) are respectively glued to the two flat tubes (1) by means of a first adhesive (5); a number of slot holes (33) are formed in a side wall of the liquid collection chambers (3); the two ends of the flat tubes (1) are inserted into the corresponding slot holes (33) respectively; the two ends of the flat tubes (1) and the slot holes (33) are glued in a sealed manner by means of a second adhesive (7); alternatively, a liquid collection chamber (3) is formed by stacking ends (83) of the flat tubes (1); and the ends (83) of each two adjacent flat tubes (1) are glued in a sealed manner by means of the second adhesive (7).

Description

Wave finned heat exchanger and manufacturing method thereof

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a heat exchanger, particularly a wave finned heat exchanger, and more particularly to a flat tube and a heat exchanger (especially a wave finned heat exchanger) which are completely connected by an adhesive and a method of manufacturing the same.

Background technique

Heat exchangers are heat exchange equipment widely used in vehicles, communication equipment, air conditioners and other products. Existing heat exchangers (such as flat tube finned heat exchangers) usually consist of flat tubes, fins, and headers, and in conventional flat tube finned heat exchanger manufacturing methods, flat tubes Soldering is formed by brazing between the fins and between the flat tubes and the headers. However, this welding method has the problems of high consumables, high energy consumption, multiple processes, low production efficiency, high scrap rate, and the high temperature generated by brazing causes evaporation of corrosion-resistant materials (such as galvanized layers). In addition, the high temperatures required for brazing of the composite layer aluminum alloy often lead to problems such as erosion. In addition, some prior art techniques use partial bonding and partial brazing. However, the high temperature used for brazing is easily transmitted to the adhesive through the flat tube, thereby causing damage to the adhesive; the high temperature used for brazing It is easy to cause oxidation of the surface of the aluminum alloy, thereby impairing the adhesion of the surface of the aluminum alloy; in addition, the special aluminum alloy material is required for brazing, and the cost is higher.

In view of the deficiencies of the above-mentioned brazing method, Chinese Patent No. 103,148,718 A discloses a microchannel heat exchanger comprising: a collecting pipe, a plurality of flat pipes fixedly connected to the collecting pipe, and a surface treated and fixed to the flat pipe a fin; wherein the fin and the flat tube are interference-fitted and bonded by a heat-conductive structural adhesive; the ends of the flat tube are used to set the position of the expansion device to form a fin-free area, and the fin-free area is filled with a sponge or plastic to prevent Electrochemical corrosion formed by the contact of the fins with the header.

In the above microchannel heat exchanger, first, a cold extrusion process is used between the flat tube and the collecting tube, and the process has difficulty in implementation, high cost, long time, slow process, flat tube and collecting tube. The problem of insufficient sealing strength at the joint. Secondly, when installing the fins, it is necessary to use an expansion device, which results in low production efficiency, and the extension device is evacuated to cause a "fin-free zone" between adjacent flat tubes, which reduces the heat exchange of the heat exchanger as a whole. performance.

In addition, regarding the assembly method of the fins and the flat tubes in the above microchannel heat exchanger, first, the assembly of all the fins and the flat tubes is completed, and then the heat conductive adhesive is applied on one line where the flat tubes are in contact with the fins. This makes it difficult for the thermally conductive adhesive to reach the vicinity of the centerline of the flat tube, resulting in a lower overall bond strength and thermal conductivity of the microchannel heat exchanger.

Summary of the invention

The invention deeply analyzes the potential defects and causes of various prior art, and creatively and completely conceives the whole concept, and proposes a full-gluing solution, the technical effect of which is far greater than the simple superposition of the effects of various partial adhesive technologies. In addition, the present invention also provides various preferred solutions to achieve sealing adhesive strength, thermal conductivity, corrosion resistance, durability, weight reduction, and production efficiency. Better technical results in terms of rate.

The invention provides a heat exchanger comprising: a flat tube, a fin, and a liquid collecting chamber; wherein the flat tube and the fin are spaced apart, and the first adhesive is between the flat tube and the adjacent fin Bonding; a plurality of slot holes are formed in the side wall of the liquid collecting chamber, and two ends of the flat tube are respectively inserted into the corresponding slot holes, and the two ends of the flat tube are stuck with the second adhesive by the second adhesive Sealed.

In addition, a heat exchanger is provided, comprising: a flat tube, a fin, and a liquid collecting chamber; wherein the flat tube and the fin are spaced apart, and the flat tube and the fin are bonded by the first adhesive; The liquid chamber is formed by laminating the ends of the flat tubes, and the ends of each adjacent two flat tubes are adhesively sealed by a second adhesive.

Or, more particularly, a heat exchanger comprising: a plurality of flat tubes, a plurality of sets of fins, and at least two liquid collection chambers;

Wherein the flat tube and the fin are sequentially spaced apart, and the flat tube and the fin are bonded by a first adhesive layer;

a plurality of slot holes are sequentially arranged on the side wall of the liquid collecting chamber, and two ends of the flat tube are respectively inserted into the corresponding slot holes, and both ends of the flat tube and the slot are The holes are adhesively sealed by a second adhesive layer; or, the liquid collecting chamber is formed by laminating the ends of the flat tubes, and a second adhesive is interposed between the ends of the adjacent two flat tubes Layer bonding seal.

Wherein, after the adhesive is applied and cured, a layer is formed, that is, an adhesive layer is formed. The layers of the adhesive layer of the present invention have a broader meaning, including uniformly continuous layers, as well as non-uniform or intermittent layers.

Secondly, the present invention also provides a heat exchanger manufacturing method comprising the following steps:

Step 1: spacing the flat tube and the fin, and bonding the flat tube to the fin by a first adhesive, the first adhesive being disposed outside the flat tube at the junction with the fin Surface, or disposed at the peak of the fin;

Step 2, a second adhesive is disposed on the outer surface of the two ends of the flat tube or at the slot of the liquid collecting chamber, and the two ends of the flat tube are respectively inserted into the corresponding slot holes, and The second adhesive bonds and cures the flat tube with the slot hole to form a heat exchanger.

More specifically, in an embodiment of the manufacturing method, the method includes:

Step 1: providing a first adhesive on the outer surface of the flat tube at the junction with the fin or at the peak of the fin;

Step two, the flat tube and the fin are arranged at intervals, and the flat tube is bonded to the fin by the first adhesive to form a heat exchanger core;

Step 3: placing a second adhesive on the outer surface of the two ends of the flat tube or at the slot of the liquid collecting chamber, inserting the two ends of the flat tube into the corresponding slot holes, and inserting the flat tube with the second adhesive The slot is bonded to the cured seal to form a heat exchanger.

Further, prior to step one, the outer surfaces of both ends of the flat tube are ground to form a rough surface.

Again, the present invention also provides another heat exchanger manufacturing method comprising the following steps:

Step 1. Set a second adhesive on the outer surface of the two ends of the flat tube or in the slot of the liquid collecting chamber, insert the two ends of the flat tube into the corresponding slot holes, and use the second adhesive to connect the flat tube with the second adhesive. The slot hole of the liquid collecting chamber is adhesively sealed to form a flat tube collecting chamber assembly;

Step two, providing a first adhesive on the outer surface of the flat tube at the junction with the fin or at the peak of the fin;

Step 3: placing fins between two adjacent flat tubes, and bonding the flat tubes and fins by the first adhesive to form a heat exchanger.

In the above, the curing of the first adhesive and the curing of the second adhesive may be respectively cured after the respective sizing, or may be cured together after the sizing is completed.

In the above manufacturing method, the fins are preferably corrugated fins. After the first adhesive is sized, the corrugated fins and the flat tubes are alternately arranged alternately, and a clamping force is applied to the flat tubes or side plates on the outermost sides to press the intermediate fins and the flat tubes. Connected to form a sandwich sandwich structure. The sandwich structure is not limited to 2 or 3 flat tubes, and may even be more. This makes the assembly between the flat tube and the fin simpler, the connection is tighter and the heat conduction effect is better.

In order to further improve the adhesive sealing strength of the second adhesive between the flat tube and the liquid collecting chamber, preferably, after inserting the slot holes at both ends of the flat tube, insert the flat tube into the flat tube through the reaming device, so that the flat tube nozzle After expansion, the hole is more tightly bonded to the slot. Wherein, the reaming device is preferably a wedge-shaped insert that matches the size of the flat tube nozzle.

Preferably, the opening of the sump slot hole is funnel-shaped (or the slot hole has a "V" shape); so that the adhesive sufficiently fills the gap between the slot hole and the flat tube, and increases The sealing area achieves the effect of increasing the sealing strength. More preferably, the funnel-shaped large opening faces the inside of the liquid collection chamber, and the small opening faces the outside of the liquid collection chamber; thus, the glue can be performed inside the liquid collection chamber.

Wherein, the liquid collecting chamber is a general term for collecting liquid or liquid separating parts on the heat exchanger, and includes a collecting tube (or a collecting tube) of the parallel flow heat exchanger, and a water chamber and a main body of the automobile water tank (heat sink). The cavity formed by the sheet, the inlet and outlet joints at both ends of the tube-and-belt heat exchanger, and the liquid collection chamber formed by the end of the flat tube of the stacked heat exchanger.

Preferably, the heat exchanger comprises two liquid collection chambers, namely an inlet liquid collection chamber and a liquid collection liquid collection chamber; the two liquid collection chambers may be separate or integrated. Of course, the liquid collection chamber may sometimes include two or more juxtaposed sub-intake collection chambers; the liquid collection chamber may also include two or more juxtaposed sub-outlet collection chambers.

In addition, the fins may also be referred to as fins or heat sinks, and the slot holes may also be referred to as flat tube slots.

The flat tube of the present invention comprises a single orifice tube, a B-shaped tube, and an extruded porous harmonica tube, but is preferably a flat tube in the form of an overflow tank as described in CN201310348776.8.

Among them, the adhesive can also be said to be an adhesive. The adhesive includes a paste glue, a liquid glue, a powdery glue, etc.; of course, the adhesive may be formed into a film beforehand, for example, a paste adhesive is applied to the fiber. On the weibu, it is then used to bond the flat tubes and fins of the heat exchanger.

Further, the first adhesive is a thermal conductive adhesive.

Further, the first adhesive is a conductive adhesive.

Further, the first adhesive contains a heat conductive filler.

Further, the first adhesive is composed of a mixed material comprising a viscous substrate and a thermally conductive filler. Or the first adhesive is mainly made of a mixture of a viscous substrate and a thermally conductive filler. Or the first adhesive layer is made of a mixture of a viscous substrate and a thermally conductive filler. Of course, the first adhesive may also consist of only a viscous substrate. The adhesive substrate of the present invention may also be referred to as an adhesive substrate, and refers to an adhesive before the addition of the heat conductive filler. Therefore, the adhesive substrate of the present invention may comprise only the adhesive matrix resin, or may comprise an adhesive matrix resin, a curing agent, other auxiliary agents, etc.; but does not include a thermally conductive filler. Preferably, however, the first adhesive contains a thermally conductive filler. Alternatively, further, the first adhesive is doped with a thermally conductive filler to improve the thermal conductivity of the first adhesive.

Further, the heat conductive filler is an electrically conductive and thermally conductive filler having a conductive function. Thus, by controlling the ratio of the conductive and thermally conductive filler, the first adhesive can not only have a good heat conduction function, but also have a certain conductive function.

Alternatively, further, the thermally conductive filler is a non-conductive, thermally conductive filler and/or an electrically and thermally conductive filler.

Further, the thermally conductive filler is a ceramic powder. Further, the thermally conductive filler is formed by mixing ceramic powders of different particle sizes.

Further, the thermally conductive filler is alumina powder, silicon oxide powder, zinc oxide powder, aluminum nitride powder, boron nitride powder, silicon carbide powder, aluminum powder, copper powder, zinc powder, silver powder, nickel powder, iron powder , a combination of one or more of zinc powder, graphite powder, carbon black powder. More preferably, the thermally conductive filler is aluminum powder. The shape of the aluminum powder may be dendritic, or spheroidal, or spherical, or drop-shaped, or hemispherical.

Further, the thermally conductive filler accounts for 0.1%-5%, or 5%-10%, or 10%-20%, or 20%-30%, or 30%-40% of the weight percentage of the first adhesive, or 40%-50%, or 50%-60%, or 60%-70%, or 70%-80%, or 80%-99%. Among them, a more preferred percentage by weight is 50% to 60%.

Further, the conductive and thermally conductive filler is formed by mixing graphite powders of different particle sizes; or the conductive and thermally conductive fillers are formed by mixing metal powders of different particle sizes; or the conductive and thermally conductive fillers are composed of graphite powders of different particle sizes and metal powders of different particle sizes. Mixed formation.

The above combination of fillers of different particle sizes facilitates the formation of a thermally conductive bridge and/or a conductive bridge to improve thermal and/or electrical conductivity.

Further, the thermally conductive filler has a particle size of 1-3 microns, or 3-5 microns, or 5-10 microns, or 10-15 microns, or 15-20 microns, or 20-30 microns, or 30-50. Micron.

Further, if the first adhesive does not contain a heat conductive filler, the first adhesive is any one or more of an acrylic adhesive, an epoxy adhesive, a polyurethane adhesive, a quick-drying adhesive, an anaerobic adhesive, and a silicone adhesive. Combination of species. If the first adhesive comprises a thermally conductive filler, the adhesive substrate of the first adhesive is an acrylic adhesive, A combination of any one or more of an epoxy resin adhesive, a polyurethane adhesive, a quick-drying adhesive, an anaerobic adhesive, and a silicone adhesive.

Wherein, the adhesive may be one-component or two-component. The curing of the adhesive can be either curing at room temperature or curing at room temperature. Of course, under other conditions, room temperature curing and rapid curing are preferred, which can save energy and speed up the production rhythm. Or, further, the first adhesive comprises an adhesive material, and the adhesive material of the first adhesive is an acrylic adhesive, an epoxy adhesive, a polyurethane adhesive, a quick-drying adhesive, an anaerobic adhesive, and a silicone adhesive. Any combination of one or several.

Among them, silicone adhesives include various silicone or silicone resins, such as paste or liquid.

Further, the thickness of the first adhesive is: 0 to 1 micrometer, or 1 micrometer to 5 micrometer, or 5 micrometer to 10 micrometer, or 10 micrometer to 20 micrometer, or 20 micrometer to 50 micrometer, or 50 micrometer to 100 micrometer, Or 100 microns to 200 microns. The thickness of the first adhesive is more preferably from 20 μm to 50 μm.

Further, the first adhesive is formed in a coating or flat manner.

Further, the first adhesive is applied by one or a combination of spraying, brushing, roll coating, dip coating, dispensing, screen printing, roll coating, electrophoresis, and blade coating. More preferably, it is brush or roll.

Further, the second adhesive comprises an adhesive material, and the adhesive material of the second adhesive is any one of an acrylic adhesive, an epoxy adhesive, a polyurethane adhesive, a quick-drying adhesive, an anaerobic adhesive, and a silicone adhesive. Kind or combination of several. In other words, the second adhesive layer is a combination of any one or several of an acrylic adhesive, an epoxy adhesive, a polyurethane adhesive, a quick-drying adhesive, an anaerobic adhesive, and a silicone adhesive.

In the above, the adhesive material may also be referred to as a viscous substrate, and the expressions are equivalent.

Further, the fins extend from the outer side wall of one liquid collecting chamber to the outer side wall of the other liquid collecting chamber along the length of the flat tube; more preferably, each set of fins is formed by a liquid collecting chamber along the length of the flat tube The outer sidewall extends to the outer sidewall of the other collection chamber.

Further, the flat portion, and/or the fins, and/or the metal portion of the sump are made of a single layer of aluminum alloy material. More preferably, the flat tubes, the fins, and the metal portions of the sump are each made of a single layer of aluminum alloy material.

In order to enhance the corrosion resistance of the water contact side of the flat tube, further, the inside of the flat tube is coated with an anti-corrosion coating. These anticorrosive coatings may be Teflon or the like and may have a thickness of 1-2 microns. Since the prior art uses high temperature brazing, it is impossible to use the inner polymer anticorrosive coating, and the use of the adhesive technology provides the possibility of the inner coating.

Further, the fin located at the outermost layer and the outer side panel are bonded by the first adhesive.

Further, the liquid collection chamber is provided with a flange at the slot hole.

Further, there is an interference fit between the flat tube and the slot hole.

Further, there is a rough surface on the flat tube of the portion in contact with the slot hole. It is also possible to further have a rough surface on the slot hole that is in contact with the flat tube. Usually, the outer surface of the extruded flat tube or the folded flat tube is relatively smooth, in order to Further, the adhesive sealing strength between the flat tube and the slot hole is further enhanced, and it is preferable to perform roughening treatment such as grinding on both ends of the flat tube. Preferably, the contact surface roughness (Ra) value is greater than 25, more preferably greater than 50.

Further, the fins are corrugated fins, and the first adhesive is disposed between the peaks of the flat tubes and the fins; or the first adhesive is disposed between the flat tubes and the crest skirt of the fins. Wherein, the corrugated fin refers to a fin having a shape similar to a wave on the side of the fin, and includes a sinusoidal wave-like fin, a triangular wave-shaped fin, a U-shaped corrugated fin, and a rectangular corrugated fin.

Further, the fins are corrugated fins. Still further, the corrugated fins are sinusoidal wave fins, or triangular wave fins, or U-shaped wave fins, or a Great Wall tooth fin.

More preferably, the two sides of the corrugated fin between the two flat tubes are respectively bonded to the adjacent flat tubes by the first adhesive.

Further, an inlet pipe and/or an outlet pipe are adhered to the liquid collection chamber.

Further, the liquid collection chamber is made of an all-aluminum alloy, or made of all plastic, or a combination of an aluminum alloy and a plastic. The liquid collection chamber may be integrally formed or formed by splitting the left and right sides. For example, the manifold of the parallel flow condenser is an all-aluminum structure, and the cavity formed by the plastic water chamber of the automobile engine radiator and the aluminum alloy main board (or the main piece) is also a liquid collection chamber. Of course, since the high temperature brazing process is not required, it is more preferable that the liquid collecting chamber is made of all plastic. This all-plastic liquid collection chamber also has the technical effect of low cost and light weight, such as the liquid collection chamber made of plastic water chamber and plastic main board.

Further, the material of the flat tube is a metal material. A metal material having good thermal conductivity is preferred. More preferably, it is an aluminum alloy material.

Further, the material of the fin is a metal material. A metal material having good thermal conductivity is preferred. More preferably, it is an aluminum alloy material.

Further, the material of the flat tube is a 1 series aluminum alloy, or a 3 series aluminum alloy, or a 4 series aluminum alloy, or a 5 series aluminum alloy, or a 6 series aluminum alloy material.

Further, the flat tube has a wall thickness of 0.1-1.0 mm. Preferably, the flat tube has a wall thickness of 0.1 to 0.5 mm. More preferably, the flat tube has a wall thickness of 0.12 to 0.20 mm.

Further, the material of the fin is a 1 series aluminum alloy, a 3 series aluminum alloy, or a 4 series aluminum alloy, or a 5 series aluminum alloy, or a 6 series aluminum alloy material.

Further, the fin aluminum foil has a thickness of 0.01 to 0.3 mm. Preferably, the thickness is from 0.02 to 0.2 mm. More preferably, the thickness is from 0.05 to 0.1 mm.

Further, the flat tube is formed by compounding a base material aluminum alloy and a water-contacting layer aluminum alloy, and the water contact layer is located inside the flat tube and is in contact with the heat exchange liquid medium, and the corrosion potential of the water contact layer is negative to the corrosion potential of the substrate. Wherein, the heat exchange liquid medium may be water or an antifreeze liquid mainly composed of ethylene glycol and water.

Further, the corrosion potential of the fin is negative to the corrosion potential of the flat tube. Or if the flat tube is made of a substrate aluminum alloy It is formed by compounding with the aluminum alloy of the water contact layer, and the corrosion potential of the fin is negative to the corrosion potential of the aluminum alloy of the flat tube substrate. Preferably, the corrosion potential difference between the fin and the flat tube is between 50 mV and 300 mV; more preferably the potential difference is between 100 mV and 150 mV. If the potential difference is too small, the fin protection effect will be poor. If the potential difference is too large, the fin will preferentially corrode too quickly.

The positive effects of the present invention on the basis of the above are:

In the heat exchanger provided by the present invention, the functions and performance requirements of the first adhesive and the second adhesive are not completely the same, and the same adhesive can be used to completely cover the requirements of both, but it is preferable to use different adhesives to satisfy the two. Claim. Preferably, the first adhesive having a good thermal conductivity added with a heat conductive filler is used to bond the flat tube and the fin, and the second adhesive having a good adhesive strength is preferably used to bond the flat tube and the slot hole in the liquid collecting chamber. The method provides a stable and firm bonding effect between the flat tube and the fin, between the flat tube and the liquid collecting chamber, and can fully ensure the sealing strength between the flat tube and the liquid collecting chamber. In addition, the fins extend from the outer side wall of one liquid collecting chamber to the outer side wall of the other liquid collecting chamber. Such a structure can eliminate the finless area which is ubiquitous in the existing heat exchanger, thereby greatly improving the heat exchange of the heat exchanger. performance.

The first adhesive mainly functions as a thermal interface material TIM (thermal interface material) for interstitial and heat conduction between the fin and the flat tube; the second adhesive mainly serves as a contact surface seal. Preferably, however, the first adhesive has a high thermal conductivity and thermal conductivity; the second adhesive has a high seal bond strength, such as preferably high shear strength and tensile strength.

The heat exchanger manufacturing method provided by the invention adopts a method of first coating the first adhesive and then pressing the flat tube and the fin, and does not need unnecessary equipment such as “cold extrusion device” and “expansion device” in the conventional process, and the manufacturing cost. Low, faster and more convenient to manufacture, suitable for high-volume, fast-paced production. The method can ensure that the first adhesive between the flat tube and the fin is uniformly coated, well bonded, and fully contacted; in addition, the manufacturing method fills the gap between the flat tube and the liquid collecting chamber, and eliminates the finless area. Therefore, there is no hidden danger of air leakage, the heat exchange area is fully utilized, and the corrosion problem of the header is solved. Thereby obtaining a better heat exchange effect.

In the flat tube finned heat exchanger provided by the present invention, in addition to the conventional aluminum alloy material, it is more preferable to use a full plastic material such as polypropylene PP or nylon PA. To lighter technical effects. In addition, since the plastic can be molded by injection molding, the plastic liquid collecting chamber can be more complicated and more reliable than the aluminum alloy liquid collecting chamber. For example, the plastic grooving slot has wider plastic flanges, which is beneficial to improve liquid collection. The seal strength between the cavity and the flat tube.

Furthermore, the present invention preferably employs wave fins such as sinusoidal wave fins, or triangular wave fins, or U-shaped wave fins, or rectangular wave fins, wherein the rectangular fins may also be referred to as Great Wall tooth fins; A certain pressing force can be applied to the upper and lower peaks and troughs of the wavy fin without being damaged. In this way, a plurality of sets of fins and a plurality of flat tubes can be easily stacked at intervals, forming a heat exchanger core like a sandwich structure, and applying a certain fastening on the outermost two flat tubes or side plates. The force of the sandwich heat exchanger core is firmly bonded, which makes the whole manufacturing process easier, and the connection between the fin and the flat tube is tighter and the heat conduction is more efficient. In addition, after the corrugated fins are stacked with the flat tubes, the flat tubes can be supported by the fins, thereby lowering The strength requirement of the support of the liquid collection chamber at both ends of the flat tube is lowered.

The present invention employs a fully adhesive manner, whether between the flat tube and the fin or between the flat tube and the collecting chamber. This avoids the defects caused by the welding of part of the bonding part, avoids the negative influence of the high temperature during welding on the original bonding; avoids the oxidation of the surface of the aluminum alloy caused by the high temperature used for brazing, thereby damaging the adhesion of the surface of the aluminum alloy In addition, it also avoids the cost of special aluminum alloy materials for brazing. In addition, the flat tube, the fin and the liquid collecting chamber used in the present invention preferably adopt a mature structure, which not only facilitates quick docking with the prior art, but also avoids the use of a special structure such as an overflow tank and a glue injection tank. The increased cost also avoids assembly difficulties and inefficiencies caused by the use of pin fins.

It is worth noting that, compared with the prior art, the present invention not only provides a new basic solution for the full adhesive assembly of the heat exchanger, but also provides sealing adhesive strength, thermal conductivity, corrosion resistance, durability, and weight reduction. Solutions to deep-seated problems such as productivity.

DRAWINGS

1 is a schematic structural view of a heat exchanger according to Embodiment 1 of the present invention;

Figure 2 is a cross-sectional view taken along line B-B of Figure 1;

Figure 3 is an enlarged view of a corresponding portion of the letter A in Figure 1;

Figure 4 is a schematic view showing the bonding of the flat tube and the fin in the fourth embodiment of the present invention;

Figure 5 is a schematic structural view of a heat exchanger according to Embodiment 5 of the present invention;

Figure 6 is a schematic structural view of a flat tube according to Embodiment 5 of the present invention;

Figure 7 is a schematic structural view of a heat exchanger according to Embodiment 6 of the present invention;

Figure 8 is a schematic view of several wavy fins of the present invention.

detailed description

In order to make the technical means, the creative features, the achievement of the object and the effect achieved by the present invention easy to understand, the following embodiments respectively describe the heat exchanger and the manufacturing method thereof provided by the present invention with reference to the accompanying drawings.

The heat exchanger according to the present invention refers to a flat tube fin-type heat exchanger which is arranged by using a flat tube and fins, and is widely used in the fields of vehicles, communication facilities, air conditioners, petrochemicals and the like. The flat tube finned heat exchanger includes the following tube and tube heat exchangers, parallel flow heat exchangers, and stacked heat exchangers.

As shown in FIG. 1 , the flat tube fin heat exchanger provided in this embodiment includes: a plurality of flat tubes 1 , a plurality of fins 2 (or fins), and two collecting chambers (or liquid collecting tubes). , or called the manifold)3. Preferably, two outer side panels 4 are also included. among them, The flat tubes 1, the fins 2, and the metal portions of the liquid collection chamber 3 are each made of a single layer of aluminum alloy material. Abandoning the expensive aluminum alloy material of the solder composite layer in the prior art, the manufacturing cost of the flat tube finned heat exchanger is lower, for example, the raw material cost can be reduced by 30% to 40%.

Specifically, the flat tube 1 and the fins 2 are sequentially spaced apart, and the flat tube 1 and the fins 2 are bonded by the first adhesive layer 5. The flat tube 1 includes a single orifice tube, a B-shaped folded tube, an extruded porous harmonica tube, and the like. In addition, the flat tube 1 may be a microchannel flat tube, a small channel flat tube, and other tubes having a cross-sectional shape of approximately square or flat.

The liquid collecting chamber 3 on the right side of FIG. 1 is provided with a liquid inlet port 31 and a liquid outlet port 32. The liquid inlet port 31 and the liquid outlet port 32 can be opened in the same liquid collecting chamber 3, of course, the liquid inlet port 31 and The liquid outlets 32 can also be opened on different liquid collection chambers 3, respectively. The liquid inlet port 31 and the liquid outlet port 32 may be integrally formed with the liquid collecting chamber 3, or glued to the liquid collecting chamber 3, or welded to the liquid collecting chamber 3 in advance.

The liquid collection chamber 3 in this embodiment is made of an all-aluminum alloy, or made of all plastic, or a combination of an aluminum alloy and a plastic. In addition, as shown in FIG. 1 to FIG. 3, a plurality of slot holes 33 are sequentially arranged on the side wall of the liquid collection chamber 3, and the two ends of the flat tube 1 are respectively corresponding to the second adhesive layer 7 and The slot hole 33 is adhesively sealed.

The two outer side panels 4 are respectively located outside the outermost fins 2, and are bonded by the first adhesive layer 5 between the outermost fins 2 and one outer side panel 4.

The first adhesive layer 5 is made of a mixture of a viscous substrate and a thermally conductive filler. Wherein, the heat conductive filler accounts for 50%-60% by weight of the first adhesive layer 5.

In the present embodiment, the thermally conductive filler is preferably a ceramic powder. As a more preferred technical solution, the ceramic powder is an aluminum nitride powder. The viscous substrate is preferably a silicone adhesive.

In the present embodiment, the first adhesive layer 5 may be formed by coating. As a preferred solution, the first adhesive layer 5 can be applied by brushing.

Also, the thickness of the first adhesive layer 5 can be selected according to a specific case: 20 μm to 50 μm.

The second adhesive layer 7 is an epoxy resin adhesive or a silicone silica gel.

As a preferred technical solution, each of the fins 2 extends from the outer side wall of one of the liquid collecting chambers 3 to the outer side wall of the other liquid collecting chamber 3 along the length of the flat tube 1. With such a structure, the fin-free region ubiquitous in the existing heat exchanger is eliminated, thereby eliminating the adverse effect on the heat exchange performance.

In order to enhance the bonding strength between the flat tube 1 and the slot hole 33 and to enhance the sealing effect, the liquid collection chamber 3 is provided with a flange (not shown) at the slot hole 33, and the flat tube 1 and the slot An interference fit is preferably provided between the holes 33, and in addition, the portion of the flat tube 1 that is in contact with the slot holes 33 (i.e., both end portions of the flat tube 1) has a rough surface. At the same time, this bonding method also has the advantages of high pressure resistance, higher leakage resistance and more reliable quality.

In the present embodiment, the fins 2 are corrugated fins, for example, triangular wave fins as shown in FIG. The bonding effect is that the first adhesive layer 5 is disposed between the peaks of the flat tube 1 and the fins 2. Of course, in order to obtain a better heat exchange effect, the peak of the fin 2 can be further penetrated into the first adhesive layer and As far as possible, it is in contact with the outer side wall of the flat tube 1, and the heat transfer is assisted by the crest skirt of the fin 2.

The following table compares the brazing core, the common adhesive core, and the thermally conductive adhesive core provided in this embodiment:

	钎焊芯体Brazed core	普通胶粘芯体Ordinary adhesive core	导热胶粘芯体1Thermally conductive adhesive core 1	导热胶粘芯体2Thermally conductive adhesive core 2
换热量(W)Heat exchange capacity (W)	48004800	43204320	47044704	48964896
风阻(Pa)Wind resistance (Pa)	160160	147.2147.2	147.2147.2	152152

Wherein, the thermally conductive adhesive core 1 is the basic structure of the embodiment, and the thermally conductive adhesive core 2 is optimized on the basis of the basic structure by eliminating the finless zone and using the peak skirt to assist heat transfer and the like. Program.

For the heat exchanger, the heat exchange amount is required to be as large as possible, and the wind resistance is as small as possible. As can be seen from the above table, the first adhesive layer is used to bond the fins and the flat tube with respect to the conventional brazing core body. It can reduce the wind resistance while increasing the amount of heat exchange.

In the flat tube finned heat exchanger provided in this embodiment, the flat tube and the fin are bonded by using the first adhesive layer having good thermal conductivity, and the flat tube and the liquid collecting chamber are sealed by the second adhesive layer. The slot hole enables a stable and firm bonding effect between the flat tube and the fin, between the flat tube and the liquid collection chamber, and can sufficiently ensure the sealing strength between the flat tube and the liquid collection chamber. Compared with the prior art, the flat tube and the fin are used, and the flat tube and the liquid collecting tube are uniformly bonded by the heat conductive structure glue. This embodiment treats the two parts separately, and the first adhesive requirement is very good. The thermal conductivity, but the bonding strength is not high, so it is preferred to use an adhesive doped with a thermally conductive filler, which reduces the bonding strength but improves the thermal conductivity; and the second adhesive requires a very high sealing bond strength (up to 10MPa), and no requirement for thermal conductivity, it is preferred to use a high-strength structural adhesive that is not doped with a thermally conductive filler, so as to ensure good sealing and bonding, such as epoxy structural adhesive. Additionally, the fins extend from the outer sidewall of one of the plenums to the outer sidewall of the other plenum. Such a structure can eliminate the finless zone which is ubiquitous in the existing heat exchanger, thereby greatly improving the heat transfer performance of the flat tube finned heat exchanger.

In addition, in this embodiment, a method for manufacturing a flat tube finned heat exchanger for manufacturing the above flat tube finned heat exchanger, the method for manufacturing the flat tube finned heat exchanger includes the following steps :

Step 1: providing a first adhesive layer on the outer surface where the flat tube meets the fin or at the peak of the fin;

Step two, each flat tube and each set of fins are arranged at intervals, and the flat tube and the fin are bonded and solidified by the first adhesive layer to form a flat tube finned heat exchanger core body;

Step 3: placing a second adhesive layer on the outer surface of both ends of the flat tube or at the slot hole of the liquid collecting chamber, inserting each end of each flat tube into the corresponding slot hole and adopting the second adhesive layer The flat tube and the slot hole are bonded and solidified to form a flat tube finned heat exchanger.

As a preferred technical solution, before step one, the outer surfaces of both ends of the flat tube are also polished to form a rough surface.

Wherein, the above first adhesive layer can be applied to the flat tube or to the fin, and can be applied according to the actual situation. Make a choice. The sizing tool can dispense the fin peaks with a multi-point plastic head in the form of a comb.

Since the fins are made of corrugated fins, after the first adhesive is sized, the fins and the flat tubes are alternately arranged in a stack, and a clamping force is applied to the flat tubes or side plates on the outermost sides to apply the intermediate fins. The flat tube is pressed tightly to form a sandwich sandwich structure. This makes the assembly between the flat tube and the fin easier, the connection is tighter and the heat conduction effect is better.

The method for manufacturing the flat tube finned heat exchanger provided by the embodiment adopts a method of first coating the first adhesive layer and then pressing the flat tube and the fin, without the need of the "cold extrusion device" and the "expansion device" in the conventional process. Unnecessary equipment, low manufacturing cost, faster and more convenient manufacturing, suitable for high-volume, fast-paced production. The utility model can ensure that the first adhesive layer between the flat tube and the fin is uniformly coated, well bonded and fully contacted; in addition, the manufacturing method fills the fin with a gap between the flat tube and the liquid collecting chamber, and eliminates winglessness. In the area, there is no hidden danger of air leakage, and the heat exchange area is fully utilized, and the corrosion problem of the collecting tube is solved. Thereby obtaining a better heat exchange effect.

In addition, compared with the prior art, the flat tube and the liquid collection chamber used in the present invention do not require unnecessary structures such as a special overflow tank and a glue injection tank, and the components of the flat tube and the liquid collection chamber are simplified. The structure saves component costs and enables sizing in a simple and efficient process.

In the present embodiment, the same portions as those in the first embodiment are given the same reference numerals, and the same characters are omitted.

As shown in FIGS. 1 to 3, the first adhesive layer 5 is made of a mixture of a viscous substrate and an electrically and thermally conductive filler, and the electrically conductive and thermally conductive filler accounts for 20% to 30% by weight of the first adhesive layer 5.

As a preferred technical solution, the conductive and thermally conductive filler is graphite powder or metal powder. Specifically, the conductive and thermally conductive filler is formed by mixing graphite powders of different particle diameters. Of course, the conductive and thermally conductive fillers may also be formed by mixing metal powders of different particle sizes. Of course, the conductive and thermally conductive fillers are more ordinarily composed of graphite powders of different particle sizes. Metal powders of different particle sizes are mixed to form. The metal powder is aluminum powder.

Preferably, the flat tube and the fin are both made of a non-composite layer of aluminum alloy, that is, a single layer of aluminum alloy (or aluminum alloy light foil), and the corrosion potential of the fin is negative to the corrosion potential of the flat tube, such as 3003 aluminum for the flat tube. The alloy, while the fins are added with a weight percentile of 1.5% zinc on a 3003 aluminum alloy basis.

Compared with the first embodiment, in the embodiment, the conductive adhesive material and the adhesive substrate are mixed to form a first adhesive layer having better conductivity and thermal conductivity, and the advantage is that the first adhesive layer having electrical and thermal conductivity enables the flat tube and the fin. Electrical connection is formed. When a corrosive electrolyte is present, the flat tube is used as the cathode and the fin is used as the anode. The sacrificial fin anode can be sacrificed, the flat tube cathode can be protected, the flat tube corrosion can be prevented from leaking, and the flat tube corrosion resistance can be improved. Increase the service life of the heat exchanger and greatly improve the heat transfer performance of the heat exchanger.

In this embodiment, the method for manufacturing the flat tube finned heat exchanger is carried out as follows:

Step 1. A second adhesive layer is disposed on the outer surface of the two ends of the flat tube or at the slot of the liquid collecting chamber, and the two ends of each flat tube are respectively inserted into the corresponding slot holes, and the second adhesive is used. The layer is bonded and solidified by the flat tube and the slot hole of the liquid collecting chamber to form a flat tube collecting chamber assembly;

Step two, providing a first adhesive layer on the outer surface where the flat tube meets the fin or at the peak of the fin;

Step 3: placing fins between two adjacent flat tubes, and bonding the flat tubes and the fins by the first adhesive layer to form a flat tube finned heat exchanger.

Among them, the fins are corrugated fins, such as sinusoidal wave fins. After the first adhesive is sized, the fins and the flat tubes are alternately arranged in a stack, and a clamping force is applied to the flat tubes or side plates on the outermost sides to connect the intermediate fins and the flat tubes to form a sandwich. Mezzanine structure. This makes the assembly between the flat tube and the fin simpler, the connection is tighter and the heat conduction effect is better.

If the liquid collection chamber is a structure formed by splicing the left and right sides of the main plate and the water chamber, in order to ensure a better sealing strength between the flat tube and the liquid collection chamber, after the flat tube is inserted into the main body of the liquid collection chamber, on the inner side of the main board Sizing with the joint around the flat tube. This makes the adhesive seal of the adhesive more secure.

As shown in FIG. 4, in the present embodiment, the difference from the first embodiment is that the first adhesive layer 6 is disposed between the crest skirt of the fin 2 and the flat tube 1.

Compared with the first embodiment, the technical solution of the embodiment can make the first adhesive layer 6 have smaller thermal resistance and better heat exchange performance, and can reduce the coating range of the first adhesive layer 6 while ensuring the bonding effect. , thereby reducing production costs.

As shown in FIG. 5 and FIG. 6, in the present embodiment, the difference from the first embodiment is that the present embodiment provides a stacked heat exchanger such as a stacked evaporator or the like. The flat tube 8 (or plate tube) of the stacked heat exchanger is composed of two sheets of stamped laminated sheets 8a (or laminated sheets or laminated sheets or heat sinks), and two laminated sheets constituting the flat tubes 8. The second adhesive around the periphery of 8a is coated with a second adhesive to seal the flat tube 8; and a bump 81 and a raised strip 82 in the laminated plate 8a (the raised strip 82 is used to form the internal partition) Applying the second adhesive to the bumps 81 and bumps in the other laminate Strip 82 is bonded to the closed joint to form the flat tube 8 required for the stacked heat exchanger.

The liquid collection chamber 3 is formed by laminating the ends 83 of the flat tubes 8. The two liquid collection chambers 3 of the stacked heat exchanger are juxtaposed on the same side of the flat tube 8. Specifically, the end 83 of the flat tube 8 is formed with two openings 831, and the ends 83 of the adjacent two flat tubes 8 are adhered and sealed by the coated second adhesive layer 7, and a plurality of axially aligned The openings 831 combine to form a through sump 3.

Of course, the flat tube 8 required for the stacked heat exchanger can also be laminated by two sheets and brazed.

In addition, the fins use corrugated fins, such as rectangular corrugated fins.

Compared with the first embodiment, the technical solution of the embodiment has the advantages that the liquid collection chamber of the stacked heat exchanger is composed of the end of the flat tube; the structure is simplified and the heat exchange efficiency is higher.

As shown in FIG. 7, in the present embodiment, the difference from the first embodiment is that the embodiment is applicable to a tube-and-belt heat exchanger, that is, the flat tube 1 is formed by a flat tube serpentine bending. The liquid collection chamber 9 is an inlet and outlet header at both ends of the flat tube.

In this embodiment, the difference from the first embodiment is that the heat exchanger is a front-end heat dissipation water tank of the automobile, and the liquid collection chamber is formed by combining a plastic water chamber and an aluminum alloy main sheet.

Of course, the heat exchanger and the method of manufacturing the same according to the present invention are not limited to the structures of the first to seventh embodiments, and any equivalent modifications and substitutions to the present invention are also within the scope of the present invention.

In the first to seventh embodiments, the wavy fins are taken as an example. Of course, in the flat tube finned heat exchanger provided by the present invention, the fins may also be zigzag fins or trapezoidal fins. sheet.

In the first to seventh embodiments, the liquid collecting chambers are two. Of course, for the integrated flat tube finned heat exchanger, three or four liquid collecting chambers can be arbitrarily set according to actual conditions. For example, the heat exchanger comprises two left and right sub-heat exchangers connected in series, the heat exchanger comprises three liquid collection chambers, and the liquid collection chamber of the left sub-heat exchanger is also the inlet of the right sub-heat exchanger. Liquid collection chamber.

In view of the above-described embodiments of the present invention, various changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and the technical scope thereof must be determined according to the scope of the claims.

Claims

A heat exchanger comprising: a flat tube, a fin, and a liquid collection chamber;

Wherein the flat tube and the fin are spaced apart, and two sides of the fin between the two flat tubes are respectively bonded to the two flat tubes by a first adhesive;

a plurality of slot holes are defined in a sidewall of the liquid collection chamber, and two ends of the flat tube are respectively inserted into the corresponding slot holes, and between the two ends of the flat tube and the slot holes Sealed by a second adhesive; or, the liquid collection chamber is formed by laminating the ends of the flat tubes, and the ends of each of the two adjacent flat tubes are adhesively sealed by a second adhesive.
The heat exchanger according to claim 1, comprising: a plurality of flat tubes, a plurality of sets of fins, and at least two liquid collecting chambers;

Wherein the flat tube and the fin are sequentially spaced apart, and the flat tube and the fin are bonded by a first adhesive layer;

a plurality of slot holes are sequentially arranged on the side wall of the liquid collecting chamber, and two ends of the flat tube are respectively inserted into the corresponding slot holes, and both ends of the flat tube and the slot are The holes are adhesively sealed by a second adhesive layer; or, the liquid collecting chamber is formed by laminating the ends of the flat tubes, and a second adhesive is interposed between the ends of the adjacent two flat tubes Layer bonding seal.
A heat exchanger according to claim 1 or 2, wherein said first adhesive contains a thermally conductive filler.
The heat exchanger according to claim 3, wherein the heat conductive filler is an electrically and electrically conductive filler having a conductive function.
The heat exchanger according to claim 3 or 4, wherein the heat conductive filler is alumina powder, silicon oxide powder, zinc oxide powder, aluminum nitride powder, boron nitride powder, silicon carbide powder, aluminum powder. A combination of one or more of copper powder, zinc powder, silver powder, nickel powder, iron powder, zinc powder, graphite powder, carbon black powder.
The heat exchanger according to claim 1 or 2, wherein the first adhesive comprises an adhesive material, and the adhesive material of the first adhesive is an acrylic adhesive, an epoxy adhesive, a polyurethane adhesive, and a quick drying. a combination of any one or more of an adhesive, an anaerobic adhesive, and a silicone adhesive; the second adhesive comprises an adhesive material, and the adhesive material of the second adhesive is an acrylic adhesive, an epoxy adhesive, or a polyurethane A combination of any one or more of an adhesive, a quick-drying adhesive, an anaerobic adhesive, and a silicone adhesive.
A heat exchanger according to claim 1 or 2, wherein said fins extend from the outer side wall of a liquid collecting chamber to the outer side wall of the other liquid collecting chamber along the longitudinal direction of said flat tube.
A heat exchanger according to claim 1 or 2, wherein the flat tube, and/or the fins, and/or the metal portion of the liquid collection chamber are made of a single layer of aluminum alloy material.
The heat exchanger according to claim 1 or 2, wherein the liquid collection chamber is provided with a turn at the slot hole And/or an interference fit between the flat tube and the slot hole; and/or a portion of the flat tube that is in contact with the slot aperture has a rough surface.
The heat exchanger according to claim 1 or 2, characterized in that the liquid collecting chamber is made of an all-aluminum alloy, or made of all plastic, or a combination of an aluminum alloy and a plastic.
The heat exchanger according to claim 1 or 2, wherein the first adhesive is formed by spraying, brushing, rolling, dip coating, dispensing, screen printing, roll coating, electrophoresis, and One or several combinations of drawdowns, or the first adhesive is formed in a flat manner.
A heat exchanger according to claim 1 or 2, wherein the first adhesive has a high thermal conductivity and thermal conductivity; and the second adhesive has a high sealing adhesive strength.
A heat exchanger manufacturing method, comprising the steps of:

Step 1: spacing the flat tube and the fin, and bonding the flat tube to the fin by a first adhesive, the first adhesive being disposed outside the flat tube at the junction with the fin Surface, or disposed at the peak of the fin;

Step 2, a second adhesive is disposed on the outer surface of the two ends of the flat tube or at the slot of the liquid collecting chamber, and the two ends of the flat tube are respectively inserted into the corresponding slot holes, and The second adhesive bonds and cures the flat tube with the slot hole to form a heat exchanger.
A heat exchanger manufacturing method, comprising the steps of:

Step 1: providing a second adhesive on the outer surface of the two ends of the flat tube or at the slot of the liquid collecting chamber, inserting the two ends of the flat tube into the corresponding slot holes, and a second adhesive bonding and sealing the flat tube with the slot hole of the liquid collecting chamber to form a flat tube collecting chamber assembly;

Step two, providing a first adhesive on an outer surface of the flat tube at the junction with the fin or at a peak of the fin;

Step 3: placing the fin between two adjacent flat tubes, and bonding and curing the flat tube and the fin by a first adhesive to form a heat exchanger.
The heat exchanger according to claim 1 or 2, or the heat exchanger manufacturing method according to claim 13 or 14, wherein the fins are corrugated fins.
A heat exchanger or heat exchanger manufacturing method according to claim 15, wherein said corrugated fins are sinusoidal wave fins, or triangular wave fins, or U-shaped wave fins, or rectangular wave fins. .
The heat exchanger according to claim 1 or 2, or the heat exchanger manufacturing method according to claim 13 or 14, wherein an inlet pipe and/or an outlet pipe are bonded to the liquid collection chamber.
The heat exchanger according to claim 1 or 2 or the heat exchanger manufacturing method according to claim 13 or 14, wherein the inside of the flat tube is coated with an anticorrosive coating.