CN116379826A

CN116379826A - Heat exchange assembly, assembling method thereof, micro-channel heat exchanger and heating ventilation equipment

Info

Publication number: CN116379826A
Application number: CN202310649950.6A
Authority: CN
Inventors: 岳宝; 李丰; 孙西辉
Original assignee: Midea Group Co Ltd; GD Midea Heating and Ventilating Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Heating and Ventilating Equipment Co Ltd
Priority date: 2023-06-02
Filing date: 2023-06-02
Publication date: 2023-07-04
Anticipated expiration: 2043-06-02
Also published as: CN116379826B

Abstract

The application relates to the technical field of heat exchange related equipment, and discloses a heat exchange assembly and an assembly method thereof, a micro-channel heat exchanger and heating ventilation equipment, wherein the assembly method of the heat exchange assembly comprises the following steps: providing a heat exchange preassembly completed by a tube penetrating; and applying outward preset pressure to the inner wall of the flat tube in the heat exchange preassembly, so that the flat tube is deformed outwards, and the flat tube is fixedly connected with the fins in an expanded mode. The drainage performance of the heat exchange assembly is improved, and therefore condensed water can be timely discharged when the heat exchange assembly is applied to evaporation working conditions, and heat exchange efficiency of the heat exchange assembly is improved.

Description

Heat exchange assembly, assembling method thereof, micro-channel heat exchanger and heating ventilation equipment

Technical Field

The application relates to the technical field of heat exchange related equipment, in particular to an assembly method of a heat exchange assembly, the heat exchange assembly, a micro-channel heat exchanger and heating ventilation equipment.

Background

The aluminum microchannel heat exchanger has the advantages of compact structure, high heat exchange efficiency, low refrigerant consumption and the like. The assembly efficiency of fin and flat pipe is great to the machining efficiency, the processing cost influence of microchannel heat exchanger, in a microchannel heat exchanger, flat pipe and fin all have a plurality ofly generally, when adopting conventional welding, comparatively waste time and energy. In some technologies, flat tubes and fins of an aluminum microchannel heat exchanger are welded into a whole through a brazing furnace, so that the production efficiency is improved. However, in the whole welding process, the fins are required to be in a high-temperature (about 600 ℃) environment, and the tolerance temperature of the hydrophilic layer is usually not higher than 300 ℃, so that the hydrophilic layer is often coated on the flat tube and the fins in a dip-coating manner after the fins and the flat tube are welded, the durability of the hydrophilic layer is poor, the drainage performance of the fins and the flat tube is easy to influence, and when the micro-channel heat exchanger is applied to an evaporation working condition, the problem that condensate water on the fins and the flat tube is not smoothly discharged easily has a large influence on the heat exchange performance.

Disclosure of Invention

The purpose of this application is at least to alleviate fin and flat pipe and because hydrophilic layer durability is relatively poor, and influence the problem of heat transfer performance. The aim is achieved by the following technical scheme:

a first aspect of the present application proposes a method of assembling a heat exchange assembly, comprising:

providing a heat exchange preassembly piece completed by a penetrating pipe, wherein the heat exchange preassembly piece comprises a fin component and a flat pipe, the fin component comprises a plurality of fins which are sequentially arranged along a preset direction, each fin is provided with a slot hole, the flat pipe is penetrated in the slot holes of each fin along the preset direction, a plurality of rib plates are arranged in the flat pipe at intervals along a first direction, each rib plate is connected between two opposite side walls of the slot hole along a second direction, and the first direction, the second direction and the preset direction are intersected in pairs;

applying an outward preset pressure to the inner wall of the flat tube in the heat exchange preassembly, so that the flat tube is deformed outwards, and the flat tube is expanded and fixed with the fins, wherein the preset pressure meets the following conditions:

for said preset pressure, < >>

For the yield strength of the material of the flat tube, < > >

For the thickness of the rib plate,

for the distance between two adjacent rib plates along the first direction, the rib plates are in a +>

Is the dimension of the spacing of the two sidewalls in the second direction.

According to the assembly method of the heat exchange component, the preset acting force applied to the flat tube is between in the expansion joint process

To->

The flat tube has better expansion rate, can meet the assembly efficiency requirement of the flat tube and the fins, ensures that the heat exchange component maintains ideal processing rate, and ensures that the flat tube can deform outwards at stable speed, thereby reducing the problem that the flat tube deforms unevenly due to over-fast deformation, resulting in the reduction of local pressure resistance of the flat tube, and even the explosion of the flat tube. The application makes the flat tube to the inner wall of the flat tube by applying the outward preset pressureThe outer deformation ensures that the flat tube and the fins are connected and fixed in an expanded mode, and the connection and fixation of the flat tube and the fins can be realized without adopting a furnace passing welding mode. Meanwhile, as the expansion operation can be performed at normal temperature, the fins can be coated with the hydrophilic layer first and then are expanded and fixed with the flat tubes, the hydrophilic layer of the fins cannot be damaged at high temperature in the expansion and fixing process, the drainage performance of the heat exchange assembly is improved, and condensed water can be timely discharged when the heat exchange assembly is applied to evaporation working conditions, so that the heat exchange efficiency of the heat exchange assembly is improved.

In addition, the assembly method of the heat exchange assembly can also have the following additional technical characteristics:

in some embodiments of the present application, the web has a thickness

In the interval of 0.2 mm to 0.4 mm, the distance between two adjacent rib plates along the first direction is +.>

In the interval of 0.5 mm to 1.8 mm, the two side walls are spaced apart by a dimension in the second direction>

In the interval 0.7 mm to 3.5 mm.

In some embodiments of the present application, the wall thickness of the flat tube satisfies:

wherein, the liquid crystal display device comprises a liquid crystal display device,

is the wall thickness of the flat tube.

In some embodiments of the present application, the wall thickness of the flat tube

In the interval 0.3 mm to 0.4 mm;

and/or, theThickness of rib plate

In the interval 0.2 mm to 0.3 mm;

and/or the distance between two adjacent rib plates along the first direction

In the interval of 0.6 mm to 1.3 mm;

and/or the spacing dimension of the two side walls along the second direction

In the interval 0.75 mm to 1.5 mm.

In some embodiments of the present application, the width Wo of the flat tube in the first direction is in the interval of 12 mm to 32 mm.

In some embodiments of the present application, the method of assembling a heat exchange assembly further comprises an assembling step of the heat exchange pre-assembly, the assembling step of the heat exchange pre-assembly comprising: sequentially assembling a plurality of fins along the preset direction, sequentially penetrating the flat tubes through the slotted holes of each fin, and respectively connecting two ends of the flat tubes penetrating through the slotted holes with a current collecting assembly, wherein the two ends of the flat tubes are communicated with the corresponding current collecting assemblies;

The applying a preset pressure to the inner wall of the flat tube in the heat exchange preassembly comprises: and introducing fluid into the current collecting assembly to enable the fluid to flow into the flat tube, and applying preset pressure to the inner wall of the flat tube by the fluid.

In some embodiments of the present application, the fluid is a gas or a liquid.

In some embodiments of the present application, the assembling the plurality of fins sequentially along the preset direction includes:

providing a first circular tube and a second circular tube, arranging the first circular tube and the second circular tube at intervals along the second direction, and arranging the first circular tube and the second circular tube along the preset direction respectively;

sleeving the fins on the first round tube and the second round tube, wherein a first round hole is formed in the first end of each fin, a second round hole is formed in the second end of each fin, the slotted hole is positioned between the first round hole and the second round hole, the first round tube penetrates through the first round hole of each fin, the second round tube penetrates through the second round hole of each fin, and the first end and the second end are opposite ends of the fin in the second direction;

The two ends of the flat tube penetrating through the slotted hole are respectively connected with the current collecting assembly, and the connection comprises: and connecting the two ends of the first circular tube, the second circular tube and the flat tube with the current collecting assemblies at the corresponding ends respectively.

In some embodiments of the present application, the assembling the plurality of fins sequentially along the preset direction includes: sequentially arranging a plurality of fins along the preset direction, assembling a first positioning piece on the end surfaces of the first ends of the fins, and arranging a second positioning piece on the end surfaces of the second ends of the fins, wherein the first ends and the second ends are opposite ends of the fins in the second direction;

the two ends of the flat tube penetrating through the slotted hole are respectively connected with the current collecting assembly, and the connection comprises: and connecting the two ends of the first positioning piece, the second positioning piece and the flat tube with the current collecting assembly at the corresponding end respectively.

In some embodiments of the present application, before the assembling the plurality of fins sequentially along the preset direction, the method further includes a step of processing the fins, where the step of processing the fins includes:

providing a fin body, stamping the slot hole on the fin body, and forming a first flanging and a second flanging in the process of stamping the slot hole, wherein the first flanging is positioned on the end part of the slot hole, the second flanging is positioned on the side part of the slot hole, and the end part is connected with the side part.

In some embodiments of the present application, before the punching of the slot on the fin body, the method further includes: and roll-coating a hydrophilic layer on the fin body.

In some embodiments of the present application, the step of machining the fins further comprises:

and stamping a reinforcing structure on the fin body, wherein the reinforcing structure extends from one end of the fin body to the other end along the second direction.

In some embodiments of the present application, in the step of punching the slot hole on the fin body, a hole slit is punched at the periphery of the slot hole in synchronization, the hole slit being in communication with the slot hole.

A second aspect of the present application proposes a heat exchange assembly assembled by the method of assembling a heat exchange assembly according to the present application or any of the embodiments described above.

A third aspect of the present application proposes a microchannel heat exchanger comprising:

a housing;

the heat exchange assembly is provided in the application or any embodiment of the application, and the heat exchange assembly is arranged in the shell.

A fourth aspect of the present application provides a heating ventilation apparatus comprising a microchannel heat exchanger as set forth in the present application or any embodiment of the present application.

The heat exchange assembly, the micro-channel heat exchanger and the heating ventilation equipment have the same beneficial effects as the assembly method of the heat exchange assembly.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 schematically illustrates a schematic view of a fin in some techniques;

FIG. 2 schematically illustrates a schematic view of a heat exchange assembly in some techniques;

FIG. 3 schematically illustrates a flow diagram of a method of assembling a heat exchange assembly of some embodiments of the present application;

FIG. 4 schematically illustrates a flow diagram of a method of assembling a heat exchange assembly of some embodiments of the present application;

FIG. 5 schematically illustrates a flow diagram of an assembly step of a heat exchange pre-assembly of some embodiments of the present application;

FIG. 6 schematically illustrates a flow diagram of an assembly step of a heat exchange pre-assembly of some embodiments of the present application;

FIG. 7 schematically illustrates a flow chart of steps for processing fins according to some embodiments of the present application;

FIG. 8 schematically illustrates a schematic view of a flattened tube during expansion according to some embodiments of the present application;

FIG. 9 schematically illustrates a schematic view of a bulge of a flat tube during expansion;

FIG. 10 schematically illustrates a schematic view of a flattened tube in accordance with some embodiments of the present application;

FIG. 11 schematically illustrates a schematic view of one view of a flattened tube in accordance with some embodiments of the present application;

FIG. 12 schematically illustrates a schematic view of a fin of some embodiments of the present application;

FIG. 13 schematically illustrates a schematic view of a heat exchange assembly of some embodiments of the present application;

FIG. 14 schematically illustrates a schematic view of a fin of some embodiments of the present application;

FIG. 15 schematically illustrates a schematic view of a heat exchange assembly of some embodiments of the present application;

FIG. 16 schematically illustrates a schematic view of a heat exchange assembly of some embodiments of the present application;

FIG. 17 schematically illustrates a schematic view of a fin according to some embodiments of the present application;

FIG. 18 schematically illustrates a schematic view of a heat exchange assembly of some embodiments of the present application;

FIG. 19 schematically illustrates a flow chart of a process for obtaining a preset pressure value and a flat tube wall thickness value in accordance with some embodiments of the present application;

Fig. 20 schematically illustrates a flatness value diagram of a flat tube according to some embodiments of the present disclosure.

The reference numerals are as follows:

200. a flat tube; 201. a refrigerant flow passage; 202. rib plates; 210. an end wall; 220. a sidewall;

300. a current collecting assembly; 310. collecting pipes;

400. a fin assembly; 40. a fin; 401. a first end; 402. a second end; 41. a first side; 42. a groove; 431. a first round hole; 432. a second round hole; 44. a slot hole; 442. an end portion; 443. a side portion; 45. circumferential flanging; 46. a first flanging; 47. a second flanging; 48. a hole seam; 49. a reinforcing structure;

500. a first positioning member; 501. a first round tube;

600. a second positioning member; 601. a second round tube;

x, a first direction; y, second direction; z, the preset direction.

Detailed Description

Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

The heat exchange component of the microchannel heat exchanger comprises a flat tube and fins assembled on the flat tube, a plurality of rib plates are arranged in the flat tube, two sides of each rib plate respectively form a refrigerant flow passage for medium flow, and when the heat exchange component is applied to the heat exchanger in an air conditioner, the medium is a refrigerant. The flat tube is understood to mean a tube with a cross section having different dimensions in two mutually perpendicular directions, and specifically, the flat tube may be a flat tube with an oval cross section, or a strip-shaped flat tube with an arc-shaped edge, etc. The fins are connected with the flat tubes, heat transfer can be conducted between the fins and the flat tubes, and therefore heat exchange can be conducted between the flat tubes and the outside air through the fins, and heat exchange efficiency of the heat exchange assembly is improved.

The fin and the flat tube can be assembled by arranging slotted holes on the fin and arranging the flat tube in the slotted holes in a penetrating way. In order to facilitate the flat tube to penetrate into the slot, in some techniques, one side of the fin is a connection side (i.e. the fin is connected into a whole from top to bottom), and the other side is an opening side, so that the flat tube can be assembled onto the fin from the opening side, and the assembly is more convenient. However, the fins with the structure have no continuity from top to bottom because the open side is provided with a space for inserting the flat tube. When the micro-channel heat exchanger is applied to evaporation working conditions, the problem that condensate water is not removed smoothly easily occurs, the condensate water is easy to stay on the flat tubes and the fins, the wind resistance of the heat exchanger is increased, the heat exchange performance is reduced, and the problems that the micro-channel heat exchanger is easy to frost and defrosting and water draining are not smooth occur under a low-temperature environment are caused.

In order to improve the drainage capacity of the microchannel heat exchanger, a penetrating piece type fin can be designed, and the penetrating piece type fin is somewhat similar to a traditional copper pipe aluminum fin heat exchanger. Specifically, in some techniques, as shown in fig. 1 and 2, the fins 40 are integrally configured, that is, the fins 40 are integrally formed fins 40 sleeved on the flat tube 200, the slots 44 are punched in the middle of the fins 40 (the slots 44 are flat, that is, flat long holes), and the flat tube 200 can be inserted into the slots 44 from one axial side of the slots 44.

After the flat tube 200 penetrates into the slot hole 44 of the fin 40, further fixing connection is generally required between the flat tube 200 and the fin 40, so that the fin 40 and the flat tube 200 have better contact. In some technologies, the microchannel heat exchanger may be formed by assembling the components such as the fins 40, the flat tubes 200, the collecting pipes 310, etc. by a high temperature brazing technology, and then welding the components in a brazing furnace. The temperature in the high-temperature brazing furnace is usually higher than 600 ℃, and because the hydrophilic, hydrophobic or anti-corrosion coating on the surface of the fin 40 is not high-temperature resistant, the hydrophilic, hydrophobic or anti-corrosion useful coating on the surface of the fin 40 can only be subjected to integral dip-coating treatment after the heat exchanger is welded and molded. Compared with the method of forming a hydrophilic layer by roller coating of the fin 40, the dip coating process and equipment are more complex, the coating adhesive force is not as strong as that of roller coating, the durability is low, the service life is short, the uniformity of the coating is poor, the average thickness is thicker, the influence on heat exchange performance is larger, and the dip coating cost is higher than that of roller coating.

In order to solve the above-mentioned problems of the integral furnace feeding welding forming of the fin 40 and the flat tube 200, as shown in fig. 3, some embodiments of the present application provide an assembling method of a heat exchange assembly, which includes step S100 and step S200.

Step S100 is: a heat exchange preassembly with a tube pass is provided.

The heat exchange preassembly piece comprises a fin assembly 400 and flat tubes 200, wherein the fin assembly 400 comprises a plurality of fins 40 which are sequentially arranged along a preset direction, slotted holes 44 are formed in each fin 40, the flat tubes 200 are arranged in the slotted holes 44 of each fin 40 in a penetrating mode along the preset direction, a plurality of rib plates 202 are arranged in the flat tubes 200 at intervals along a first direction X, each rib plate 202 is connected between two opposite side walls 220 of the slotted holes 44 along a second direction Y, and the first direction X, the second direction Y are intersected with the preset direction in a two-to-two mode.

And step S200, applying outward preset pressure to the inner wall of the flat tube in the heat exchange preassembly, so that the flat tube is deformed outwards, and the flat tube and the fins are fixedly connected in an expanded mode.

Wherein, preset pressure satisfies:

。

where Pe is a preset pressure, σlim is a yield strength of the material of the flat tube 200, ti is a thickness of the rib plates 202, li is a distance between two adjacent rib plates 202 along the first direction X, and Hi is a distance dimension between the two side walls 220 along the second direction Y.

As shown in fig. 2 and 13, the preset direction Z is a direction perpendicular to the flow cross section of the flat tube 200, that is, the preset direction Z corresponds to the length direction of the flat tube 200, and may be the same as the flow direction of the refrigerant in the flat tube 200. The first direction X and the second direction Y may be perpendicular to each other, the first direction X and the preset direction Z may be perpendicular to each other, and the second direction Y and the preset direction Y may be perpendicular to each other. In this embodiment, the first direction X, the second direction Y and the preset direction Z are perpendicular to each other, and the first direction X may be understood as a width direction of the flat tube 200 and the second direction Y may be understood as a thickness direction of the flat tube 200.

As shown in fig. 1, 12, 16 and 17, the fin 40 includes a fin body and slots 44 provided on the fin body. The fin body has a first side 41 and a second side, the first side 41 and the second side are disposed opposite to each other in the second direction Y, and the slot 44 penetrates through the first side 41 and the second side of the fin body along the preset direction Z, so that the flat tube 200 can be inserted into the slot 44 of the plurality of fins 40.

The slot 44 may be provided in a flat configuration that matches the shape of the flat tube 200. The slot 44 has two ends 442 and two side portions 443, the two ends 442 are disposed opposite to each other along the first direction X, the two side portions 443 are disposed opposite to each other along the second direction Y, two ends of the side portions 443 are respectively connected to the two ends 442, and a distance between the two ends 442 is greater than a distance between the two side portions 443. Wherein both the two side portions 443 and the two end portions 442 are portions of the fin body surrounding the slot 44, i.e., both the two side portions 443 and the two end portions 442 are portions of the fin 40, specifically, one of the two side portions 443, one of the two end portions 442, the other side portion 443 of the two side portions 443, and the other end portion 442 of the two end portions 442 are sequentially connected end to form the slot 44. Both side portions 443 extend in the first direction X, and the distance between the two side portions 443 refers to the distance between the two side portions 443 in the second direction Y, which corresponds to the dimension of the slot 44 in the thickness direction of the flat tube 200. As shown in fig. 2, 12, 16 and 17, in the present embodiment, two side portions 443 are disposed in parallel, and the distance between the two side portions 443 is the same. Both end portions 442 extend along the second direction Y, in this embodiment, the end portions 442 are arc-shaped, and the two end portions 442 are disposed away from each other and concavely, and the distance between the two end portions 442 refers to the maximum distance between the two end portions 442 along the first direction X, which corresponds to the dimension of the slot hole 44 along the width direction of the flat tube 200.

As shown in fig. 10 and 11, the flat tube 200 has two end walls 210 and two side walls 220. The two end walls 210 are oppositely arranged along the first direction X, the two side walls 220 are oppositely arranged along the second direction Y, two ends of the side walls 220 are respectively connected with the two end walls 210, the distance between the two end walls 210 is larger than the distance between the two side walls 220, and a space in the flat tube 200 is formed by enclosing between the two end walls 210 and the two side walls 220. In the present embodiment, the two side walls 220 are disposed in parallel, and the distance between the two side walls 220 is the same, that is, the interval dimension Hi of the two side walls 220 in the second direction Y is the same. The two end walls 210 extend along the second direction Y, in this embodiment, the end walls 210 are arc-shaped, and the two end walls 210 are disposed away from each other and protruding, and the distance between the two end walls 210 refers to the maximum distance between the two end walls 210 along the first direction X, which corresponds to the inner diameter of the flat tube 200 along the width direction of the flat tube 200.

As shown in fig. 10 and 11, a plurality of rib plates 202 are sequentially arranged between two end walls 210, one end of each rib plate 202 is connected with a first side wall, the other end is connected with a second side wall, the rib plates 202 extend along a preset direction Z, a refrigerant flow channel 201 penetrating along the preset direction Z is formed between two adjacent rib plates 202, and in the first direction X, a refrigerant flow channel 201 is formed between two rib plates 202 located at the edge and the corresponding end wall 210. The rib plate 202 is connected between two opposite sides of the flat tube 200 along the second direction Y, and is bent along the second direction Y. In this case, when the flat tube 200 is expanded and deformed, the flat tube 200 will be deformed outwards mainly along the thickness direction of the flat tube 200, that is, the second direction Y, and in the process of outwards deformation, the included angle of the rib plates 202, which are bent and arranged in the flat tube 200, will be gradually increased, so that the rib plates 202 can always isolate the refrigerant channels 201 on both sides. As shown in fig. 10 and 11, the rib 202 may be provided in a V-shaped bent arrangement.

It should be noted that the first side wall and the second side wall are two side walls 220 of the flat tube 200 opposite to each other in the second direction Y.

The outward deformation of the flat tube 200 refers to an increase in the size of the flat tube 200 in one or more directions perpendicular to the preset direction Z, and specifically, may be an increase in the size of the flat tube 200 in the first direction X, an increase in the size of the flat tube 200 in the second direction Y, or the like, or an increase in the size of the flat tube 200 in both the first direction X and the second direction Y.

It can be understood that, as shown in fig. 10 and 11, in one flat tube 200, the plurality of rib plates 202 therein may be disposed at equal intervals, the spacing Li between two adjacent rib plates 202 along the first direction X may be the width of the refrigerant flow channel 201 between two rib plates 202 along the first direction X, when the actual value is taken, the position where the rib plates 202 are connected to the first side wall may be selected as a reference, the spacing between two adjacent rib plates 202 and the first side wall, that is, the spacing Li between two adjacent rib plates 202 and the first side wall, may naturally also be selected as a reference, and the position where the rib plates 202 are connected to the second side wall 220 may be selected, thereby obtaining the spacing Li between two adjacent rib plates 202 along the first direction X.

Note that, when the plurality of rib plates 202 are arranged at unequal intervals, the interval Li of the rib plates 202 along the first direction X may be an average value of the intervals of the plurality of rib plates 202. In some cases, when only the spacing between the individual rib plate 202 and the adjacent two rib plates 202 is different from the spacing between the plurality of rib plates 202, the spacing between the individual rib plate 202 and the adjacent two rib plates 202 may be ignored, and the same spacing between the plurality of rib plates 202 is used as the spacing Li of the rib plates 202 along the first direction X, for example, the number of the rib plates 202 is ten, nine spacings are sequentially formed between the ten rib plates 202, wherein the eight spacings have the same size, the other spacing has a size different from the size of the eight spacings, and at this time, the size of the eight spacings, that is, the size corresponding to any one of the eight spacings, may be selected.

As shown in fig. 11, the thickness of the rib 202 may be understood as the minimum distance between opposite sides of the rib 202 in the first direction X. In a flat tube 200, the plurality of rib plates 202 are generally the same thickness, i.e., the thickness Ti of each rib plate 202 is the same.

The yield strength σlim of the material of flat tube 200 may be understood as the stress threshold of the material from which flat tube 200 is formed, and the yield strength σlim of the material of flat tube 200 may be obtained by experimentation or by known techniques. The flat tube 200 and the rib plate 202 therein are generally made of the same material, so that the yield strength of the flat tube 200 is the same as that of the rib plate 202.

The flat tube 200 of this embodiment may be made of aluminum, and the yield strength σlim of the material of the flat tube 200 is the yield strength of the aluminum material from which the flat tube 200 is formed.

In the present embodiment, the interval dimension Hi of two side walls 220 along the second direction Y of one coolant flow channel 201 corresponds to the thickness dimension of the coolant flow channel 201 along the second direction Y, and the interval Li of two adjacent rib plates 202 along the first direction X corresponds to the width dimension of the coolant flow channel 201 along the second direction Y.

In this embodiment, the value of the preset pressure Pe is smaller than

In this case, the preset pressure Pe may be insufficient to deform and expand the flat tube 200 under pressure, or the rate of outward deformation of the flat tube 200 may be slow, so that the expansion efficiency of the fin 40 and the flat tube 200 is low, which increases the production cost of the fin 40 and the flat tube 200. The value of the pressure Pe is larger than +. >

In this case, the preset pressure Pe may be too large, so that the flat tube 200 deforms outwards rapidly, resulting in uneven deformation of the flat tube 200, and the local pressure resistance of the flat tube 200 decreases, so that a potential reliability hazard occurs, and even the preset pressure Pe may exceed the pressure that the flat tube 200 can bear, and the flat tube 200 bursts.

According to the assembly method of the heat exchange assembly of the present application, the preset force applied to the flat tube 200 is between during the expansion process

To->

The flat tube 200 has better expansion rate, can meet the assembly efficiency requirement of the flat tube 200 and the fins 40, and ensures that the heat exchange groupIn practical experiments, the expansion time of the flat tube 200 and the fins 40 of the present embodiment can be completed within 90 seconds, and the stable expansion of the flat tube 200 and the fins 40 can be completed in about one minute. At the same time, the preset force applied to flat tube 200 is between +.>

To->

The flat tube 200 can be deformed outwards at a relatively stable speed, so that the problem that the flat tube 200 is deformed unevenly due to too fast deformation of the flat tube 200, the local pressure resistance of the flat tube 200 is reduced, and potential reliability hazards and even the problem of blasting of the flat tube 200 occur is solved. According to the method, the outward preset pressure is applied to the inner wall of the flat tube 200, so that the flat tube 200 is deformed outwards, the flat tube 200 is fixedly connected with the fins 40 in an expanded mode, and the flat tube 200 and the fins 40 are fixedly connected in a furnace welding mode. Because the expansion operation can be performed at normal temperature, the fins 40 and the flat tubes 200 can be coated with the hydrophilic layer first, then the expansion connection and fixation of the fins 40 and the flat tubes 200 are performed, the hydrophilic layer cannot be damaged at high temperature in the expansion connection and fixation process, the drainage performance of the heat exchange assembly is improved, and condensed water can be timely discharged when the heat exchange assembly is applied to evaporation working conditions, so that the heat exchange efficiency of the heat exchange assembly is improved.

Optionally, in one embodiment, the thickness Ti of the rib 202 ranges from 0.2 mm to 0.4 mm, the distance Li between two adjacent ribs 202 along the first direction X ranges from 0.5 mm to 1.8 mm, and the distance Hi between two sidewalls 220 along the second direction Y ranges from 0.7 mm to 3.5 mm.

The thickness Ti of the rib 202 may be 0.2 mm, 0.21 mm, 0.22 mm, 0.25 mm, 0.28 mm, 0.3 mm, 0.32 mm, 0.35 mm, 0.38 mm, 0.4 mm, etc.

In one embodiment, the thickness Ti of the web 202 may be 0.2 mm to 0.3 mm.

The spacing Li between two adjacent rib plates 202 along the first direction X may be 0.5 mm, 0.55 mm, 0.6 mm, 0.8 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm.

In one embodiment, the spacing Li between two adjacent webs 202 along the first direction X may be 0.6 mm to 1.3 mm.

The spacing dimension Hi of the two sidewalls 220 along the second direction Y may be 0.7 millimeters, 0.75 millimeters, 0.8 millimeters, 1 millimeter, 1.2 millimeters, 1.3 millimeters, 1.35 millimeters, 1.5 millimeters, 1.6 millimeters, 1.8 millimeters, 2 millimeters, 2.1 millimeters, 2.2 millimeters, 2.5 millimeters, 2.8 millimeters, 3 millimeters, 3.5 millimeters.

In one embodiment, the two sidewalls 220 may have a spacing dimension along the second direction Y of 0.75 millimeters to 1.5 millimeters.

It should be noted that, the relevant dimension limitation in this embodiment is based on the fact that the flat tube 200 is not deformed outwardly, that is, the thickness Ti of the rib plates 202, the spacing Li between two adjacent rib plates 202 along the first direction X, and the spacing Hi between two side walls 220 along the second direction Y are all defined in a state before the flat tube 200 is expanded and connected with the fins 40.

According to the embodiment, through reasonable size setting, expansion connection operation of the flat tube 200 and the fins 40 can be facilitated, assembly efficiency of the flat tube 200 and the fins 40 is improved, meanwhile, compared with the fact that thickness of the rib plates 202, distance between two adjacent rib plates 202 along the second direction Y and interval dimension between two side walls 220 along the second direction Y are combined in other modes, consumable materials can be reduced, and heat exchange efficiency of a heat exchange assembly is ideal.

In one embodiment, the wall thickness of the optional flat tube 200 satisfies:

。

where To is the wall thickness of flat tube 200.

Specifically, the wall thickness To of the flat tube 200 is the minimum distance between the inner side surface of the flat tube 200 in contact with the refrigerant and the outer side surface opposite To the inner side surface. The wall thickness of the flat tube 200 is generally substantially uniform, so that the pressure resistance of the flat tube 200 is substantially the same throughout, and the problem that the flat tube 200 is excessively deformed locally when the flat tube 200 is deformed outwards due to a large difference in pressure resistance of the flat tube 200 is avoided, and the heat exchange capacity of the flat tube 200 is also relatively uniform throughout.

As shown in FIG. 9, in the present embodiment, the wall thickness To of the flat tube 200 is smaller than the lower limit

In this case, the wall thickness To of the flat tube 200 may be thinner, so that when the flat tube 200 is compressed and expanded outwards and deformed unevenly, the tube wall between the two ribs may bulge, even a bursting phenomenon occurs, the bulge of the flat tube 200 may cause poor local contact between the flat tube 200 and the fins 40, the heat exchange efficiency is reduced, and bursting of the flat tube 200 may cause expansion failure of the heat exchanger, and the product is scrapped. The wall thickness To of the flat tube 200 is greater than the upper limit +.>

This means that when the wall thickness To of the flat tube 200 is too thick, the flat tube 200 is excessively used, and the self-cost is increased; and the expansion pressure of the flat tube 200 is too high, which makes the expansion equipment and the process too severely required.

The present embodiment sets the wall thickness To of the flat tube 200 at

And (3) with

The expansion joint stability of the flat tube 200 and the fins 40 can be improved, the possibility of bulge of the flat tube 200 is reduced, the contact area between the flat tube 200 and the fins 40 is increased, and the heat exchange assembly has good heat exchange efficiency; meanwhile, excessive waste of the flat tube 200 material is reduced, and the production cost is reduced.

In one embodiment, the wall thickness To of the flat tube 200 may be 0.3 mm To 0.4 mm, and may specifically be 0.3 mm, 0.32 mm, 0.35 mm, 0.38 mm, 0.4 mm.

In one embodiment, the width of the flat tube 200 along the first direction X may optionally have a value in the range of 12 mm to 32 mm.

The width Wo of the flat tube 200 refers to the dimension between the sides of the flat tube 200 where the two end walls 210 of the flat tube 200 face away from each other before the flat tube 200 expands outwardly, that is, the dimension of the outer diameter of the flat tube 200 along the first direction X.

Specifically, the width Wo of the flat tube 200 along the first direction X may be 12 mm, 14 mm, 15 mm, 20 mm, 22 mm, 35 mm, 30 mm, 32 mm.

It is understood that the width Wo of the flat tube 200 along the first direction X is related to the number of refrigerant channels 201, and the larger the number of flat tubes 200, the larger the number of rib plates 202 that need to be provided, and the larger the number of refrigerant channels 201. In this embodiment, the width Wo of the flat tube 200 along the first direction X is designed to be between 14 mm and 32 mm, after the refrigerant flows into the flat tube 200 from the current collecting assembly 300, the refrigerant can be split in multiple channels, and the refrigerant of each refrigerant channel 201 is not distributed unevenly due to the large number of refrigerant channels, so that the heat exchange efficiency of the heat exchange assembly is improved.

In one embodiment, the wall thickness To of the flat tube 200 may be 0.3 mm To 0.4 mm, the thickness Ti of the rib 202 may be 0.2 mm To 0.3 mm, the distance Li between two adjacent ribs 202 along the first direction X may be 0.6 mm To 1.3 mm, the distance Hi between two sidewalls 220 along the second direction Y may be 0.75 mm To 1.5 mm, and the width of the flat tube 200 along the first direction X may be 12 mm To 32 mm.

It should be noted that, the value of the preset pressure Pe has a correlation with the value of the wall thickness To of the flat tube 200, and the value of the wall thickness To of the flat tube 200 may be between when the flat tube 200 is designed and processed

And (3) with

When the flat pipe is expanded, the preset expansion pressure Pe is between +.>

And->

Between them.

The following description is made with respect To the obtaining process of the value of the preset pressure Pe and the value of the wall thickness To.

Referring To fig. 19, first, the structural dimension range of the flat tube is determined, specifically, the structural dimension (i.e., structural parameter) of the flat tube may be approximately set according To the manufacturing process, the material cost, etc., where the structural dimension of the flat tube includes the thickness Ti of the rib 202, the spacing Li between two adjacent rib 202 along the first direction X, the spacing Hi between two side walls 220 along the second direction Y, and the wall thickness To of the flat tube 200. The thickness Ti of the rib 202 may be set To a value ranging from 0.2 mm To 0.4 mm, the distance Li between two adjacent rib 202 along the first direction X may be set To a value ranging from 0.5 mm To 1.8 mm, the distance Hi between two sidewalls 220 along the second direction Y may be set To a value ranging from 0.7 mm To 3.5 mm, and the wall thickness To of the flat tube 200 may be set To a value ranging from 0.2 mm To 0.65 mm.

Then, the structural dimensions (i.e. structural parameters) are designed by DOE (DESIGN OF EXPERIMENT test design), specifically, the structural dimensions of the flat tubes set above can be combined by using a parameter combination, and 132 flat tubes with different dimensional combinations can be combined. For ease of description, this process is denoted as step a.

The yield strength σlim of the material of the flat tube was measured. Specifically, the mechanical tensile test can be carried out on the flat tube material at room temperature according to the standard GB/T228-2002, and the yield strength sigma lim of the flat tube material is measured. For ease of description, this step will be referred to as step b.

Next, a representative flat tube was tested. Specifically, a representative flat tube structure can be selected from 132 flat tubes obtained in the step a, the selected flat tubes are subjected to pressure test by using a hydraulic device, initial expansion pressure (Pe lower limit) for starting expansion of the flat tubes and bursting pressure (Pe upper limit) for bursting the flat tubes are obtained, and the deformation degree of each point at the same section of the flat tubes is measured. For ease of description, this step will be referred to as step c.

And c, calibrating a Finite Element (FEA) mechanical simulation analysis model, specifically calibrating a finite element mechanical simulation analysis result of a representative flat tube structure based on the yield strength sigma lim of the flat tube material measured in the step b and by means of the initial expansion pressure, the bursting pressure and the deformation degree of the same section of the flat tube obtained in the step c.

And d, carrying out finite element mechanical simulation analysis on the structural size combination of any flat tube in the 132 flat tubes obtained in the step a by using the calibrated finite element mechanical simulation analysis model To obtain the upper limit and the lower limit of preset pressure Pe under different structural size combinations, and obtaining the upper limit and the lower limit of the wall thickness To of the flat tube 200 according To the surface flatness standard. Specifically, as shown in fig. 20, after the flat tube is compressed and expanded to be flat, the same cross section n (n is a positive integer) of the flat tube is selected, the interval sizes H1, H2, H3, H4, H5 … … Hn of the flat tube on two opposite sides of each point are measured respectively, the average value of h1+h2+h3+h4+h5+ … +hn is calculated, and the absolute value of the difference between any one point and the average value is less than or equal to 0.05 mm, so that the flat tube meets the surface flatness standard.

And performing multiple linear regression on the simulation result to obtain a formula of the preset pressure Pe. Specifically, according to the results of finite element mechanical simulation analysis of all flat tubes (i.e., all structural parameter combinations), the upper limit and the lower limit of all preset pressures Pe are combined with corresponding structural dimensions (including the thickness Ti of the rib plates 202, the distance Li between two adjacent rib plates 202 along the first direction X, and the distance Hi between two side walls 220 along the second direction Y) respectively, and then multiple linear regression statistical processing is performed to obtain the range formula of the preset pressures Pe. Wherein, after the upper limit of the preset pressure Pe and the corresponding structural size are combined to obtain logarithm, an upper limit formula of the preset pressure Pe is obtained

After the lower limit of the preset pressure Pe and the corresponding structural size are combined to be logarithm, a lower limit formula of the preset pressure Pe is obtained, namely +.>

。

Multiple linear regression is performed on the simulation result To obtain a formula of the wall thickness To of the flat tube 200. Specifically, according To the results of finite element mechanical simulation analysis of all flat tubes (i.e., all structural parameter combinations), the upper and lower limits of all wall thicknesses To of 132 flat tubes are combined with corresponding structural dimensions (including the thickness Ti of the rib plates 202, the spacing Li between two adjacent rib plates 202 along the first direction X, and the spacing Hi between two side walls 220 along the second direction Y), and then the multiple linear regression statistical processing is performed To obtain the range formula of the wall thickness To of the flat tube 200. Wherein, after the upper limit of the wall thickness To and the corresponding structural dimension are logarithmized, an upper limit formula of the wall thickness To of the flat tube 200 is obtained, namely

The method comprises the steps of carrying out a first treatment on the surface of the After taking the logarithm of the lower limit of the wall thickness To and the corresponding structural dimension, the lower limit formula of the wall thickness To of the flat tube 200 is obtained, namely

。

Finally, the preset pressure Pe and the wall thickness To of the flat tube 200 can be reasonably selected according To the actual pressure resistance and the material cost requirement of the flat tube, so as To obtain the specific structural dimension in the embodiment.

When multiple linear regression is performed on simulation results, it is often encountered that the development and variation of a certain phenomenon depend on several influencing factors, i.e. a dependent variable and several independent variables have a dependent variable relationship, and multiple linear regression analysis, i.e. multiple linear regression statistical processing (also referred to as multiple linear regression analysis prediction method) is required. The multiple linear regression analysis prediction method refers to a method of establishing a prediction model for prediction and control by analyzing the correlation between two or more independent variables and one dependent variable. The general formula of the multiple linear regression prediction model is:

+D/>

+ε

Where Y is a linear function, A, B, C, D … Z is a constant, ε is a compensation parameter,

、/>

、/>

、/>

as the variable factor, in the present embodiment, the variable factor includes the thickness Ti of the rib 202, the distance Li between two adjacent rib 202 in the first direction X, the spacing dimension Hi between two side walls 220 in the second direction Y, and the like.

In calculating the preset pressure Pe, the linear function Y, i.e., the linear function of the preset pressure Pe, can be expressed as

The method comprises the steps of carrying out a first treatment on the surface of the In calculating the wall thickness To, the linear function Y can be expressed in particular as +.>

。

It should be noted that, according to the results of the finite element mechanical simulation analysis of all the flat tubes (i.e., all the structural parameter combinations), the upper and lower limits of all the preset pressures Pe are combined with the corresponding structural dimensions (including the thickness Ti of the rib plates 202, the spacing Li between two adjacent rib plates 202 along the first direction X, and the spacing Hi between two side walls 220 along the second direction Y) to obtain logarithms, so that the reason for performing the multiple linear regression statistical processing is that,

because of

+/>

The upper and lower limit formula of the obtained preset pressure Pe +.>

The method is more in line with the expression habit of the formula;

according To the result of finite element mechanical simulation analysis of all flat tubes (i.e. all structural parameter combinations), the upper limit and the lower limit of all wall thicknesses To of 132 flat tubes are combined with corresponding structural dimensions (including the thickness Ti of the rib plates 202, the spacing Li of two adjacent rib plates 202 along the first direction X and the spacing Hi of two side walls 220 along the second direction Y) To obtain logarithms respectively, and the upper limit formula and the lower limit formula of the wall thickness To obtained by the same

And the method is more in line with the expression habit of the formula.

In some embodiments, optionally, as shown in fig. 4 to 6, the method of assembling the heat exchange assembly further includes: assembling the heat exchange preassembly. Wherein the assembling step of the heat exchange pre-assembly may comprise step S10 and step S20. Wherein, step S10 is: and sequentially assembling the fins along a preset direction, and sequentially passing the flat tubes through the slotted holes of the fins. Step S20 is: and connecting the two ends of the flat tube penetrating through the slotted hole with the current collecting assembly respectively to obtain the heat exchange preassembled piece. Wherein, both ends of the flat tube 200 are communicated with the corresponding current collecting assembly 300. Corresponding to the steps S10 and S20, as shown in fig. 4, step S200 includes step S201, specifically, step S201 is to introduce a fluid into the current collecting assembly, so that the fluid flows into the flat tube, and the fluid applies a preset pressure to the inner wall of the flat tube, so that the flat tube is deformed outwards, and the flat tube is expanded and fixed with the fins.

The flat tube 200 may be deformed and expanded outwards by inflation, in other words, the fluid may be a gas, and may specifically be a high-pressure gas, for example, carbon dioxide, high-pressure air, nitrogen, etc. The flat tube 200 may be deformed and expanded outwards by means of liquid expansion, in other words, the fluid may be a liquid, for example, volatile oil, compressor oil, refrigerant, and the like, which is compatible with the refrigerant and the compressor.

It should be noted that, when the heat exchange assembly is used normally, the heat exchange assembly is usually assembled into a heating and ventilation device (such as an air conditioning system), the heating and ventilation device is usually provided with a compressor, and a refrigerant flows in the heat exchange assembly, and when the fluid is volatile oil, compressor oil or refrigerant, the heat exchange assembly has no residue in a pipe after liquid expansion, or even if the residue exists, the residue can be mutually combined with the refrigerant and the compressor in the heating and ventilation device.

In actual assembly, as shown in fig. 1, 2, 13, 15 and 18, one heat exchange assembly generally has a plurality of flat tubes 200, and the plurality of flat tubes 200 may be sequentially arranged at intervals along the second direction Y, and slots 44 are respectively provided in correspondence with each flat tube 200 in each fin 40. When the flat tube 200 is assembled, a plurality of flat tubes 200 can be sequentially inserted into the corresponding slots 44. In this embodiment, after the flat tube 200 is connected with the current collecting assembly 300, fluid is injected into the flat tube 200 through the current collecting assembly 300, so that the pressure in the flat tube 200 is increased, and thus an outward acting force is applied to the inner wall of the flat tube 200, when the flat tube 200 has a plurality of flat tubes 200, a plurality of flat tubes 200 and fins 40 can be expanded synchronously, and the operation convenience and the processing efficiency of the heat exchange assembly are improved.

It should be noted that, the current collecting assembly 300 is connected to an expansion device for enhancing fluid through a pipeline, and the expansion device may provide fluid to the current collecting assembly 300 and may return the fluid to the expansion device. The expansion joint equipment can be provided with corresponding components such as a power pump, a compressor, a control valve and the like.

Optionally, the method for assembling a heat exchange assembly according to the present embodiment further includes a step of processing the fins 40 before sequentially assembling the plurality of fins 40 along the preset direction Z, specifically, as shown in fig. 7, the step of processing the fins includes a step S01 and a step S02.

The step S01 is as follows: providing a fin body, and roll-coating a hydrophilic layer on the fin body.

According to the fin 40 of this embodiment, can coat the hydrophilic layer through the mode of roller coat on the fin body, compare the mode of soaking the coating, equipment cost is low, convenient operation, and the reliability on the hydrophilic layer that just processes to form is stronger, and the hydrophilic layer is even, and when the follow-up use, not fragile has improved the drainage performance of fin 40.

Step S02 is: and punching a slotted hole on the fin body, and forming a first flanging and a second flanging in the process of punching the slotted hole. Wherein the first flange 46 is located on an end 442 of the slot 44 in the first direction X and the second flange 47 is located on both sides 443.

The slot 44, the first flange 46 and the second flange 47 of the fin body may be implemented on a stamping die of the fin body. Specifically, as shown in fig. 12, the first flange 46, the second flange 47 and the slot 44 may be formed by performing step-punching (implemented by a punching die) on the position of the fin body where the slot 44 is to be formed, so that both end portions 442 of the slot 44 along the first direction X are provided with the first flange 46, and both side portions 443 of the slot 44 are provided with the second flange 47. The second flanges 47 on the first side portion and the second flanges 47 on the second side portion formed by step punching are continuously arranged along the first direction X, specifically, the two side portions 443 are the first side portion and the second side portion, the space between two adjacent second flanges 47 on the first side portion is the first size, the size of the second flanges 47 on the second side portion along the first direction X is the second size, and the first size is the same as the second size, so that the number of the second flanges 47 contacted by the flat tube 200 is increased to improve the heat exchange efficiency, the number of flanges for controlling the space between the fins 40 is increased, and the supporting strength of the flanges to the fins 40 is improved.

Alternatively, the first and second turn-ups 46, 47 may be located on the same side of the fin body, e.g., the first and second turn-ups 46, 47 are both located on the first side 41.

When the fins 40 are applied to the heat exchange assembly, the fins may be stacked sequentially along the length direction of the flat tube 200, and the first flange 46 and the second flange 47 may serve as auxiliary supports between the adjacent fins 40 to control the spacing between the adjacent fins 40. The first flange 46 and the second flange 47 are formed by punching the slotted holes 44, so that the processing is convenient, the flange is not required to be additionally punched on the surface of the fin 40, the potential possibility of condensation water and frosting in the process of evaporating the micro-channel heat exchanger using the fin 40 in a low-temperature environment is reduced, and the heat exchange performance of the micro-channel heat exchanger is improved. The heat exchange performance of the micro-channel heat exchanger is improved, namely the low-temperature heating performance of the micro-channel heat exchanger is improved under the evaporation working condition.

Further, in the step of punching the slot 44 in the fin body in step S02, the circumferential flange 45 may be formed simultaneously.

Specifically, the fin body is provided with a circumferential flange 45 corresponding to the slot 44, and the circumferential flange 45 is aligned with the first flange 46 and the second flange 47, and in this embodiment, both are disposed toward the first side 41. The circumferential flange 45 is connected to the groove wall (including both side portions 443 and both end portions 442) of the groove hole 44, and extends continuously in the extending direction of the groove wall. The first flange 46 and the second flange 47 are each connected to the circumferential flange 45.

The circumferential flange 45 is formed together by the process of punching the slot 44, and is convenient to operate. And the circumferential flange 45 can be connected with the flat tube 200, so that the connection area of the fin body and the flat tube 200 is increased, and correspondingly, the connection stability of the fin 40 and the flat tube 200 is improved.

Optionally, as shown in fig. 7, the step of processing the fin may further include a step S03, where the step S03 is to stamp the reinforcing structure on the fin body. Wherein the reinforcing structure 49 extends from one end of the fin body to the other end in the second direction Y.

Stamping of the reinforcing structure 49 may also be accomplished on a stamping die. Step S03 may be performed before step S01, between step S01 and step S02, after step S02, or in synchronization with step S02, and this embodiment will be mainly described by taking step S03 after step S01 and step S02 as an example.

As shown in fig. 12, the reinforcing structure 49 formed by punching may be an indentation formed on the fin body, that is, the reinforcing structure 49 is a structure recessed from the first side surface 41 to the second side surface or recessed from the second side surface to the first side surface 41, and the reinforcing structure 49 may enhance the strength of the fin 40, so that the strength of the fin 40 is improved, the probability of causing deformation of the fin 40 and the degree of deterioration of the surface flatness of the fin 40 when the flat tube 200 is inserted into the slot 44 are reduced, the success rate of assembling the fin 40 and the flat tube 200 is improved, and the production cost is reduced. In addition, the reinforcing structure 49 is communicated with one end and the other end of the fin body along the second direction Y, and the grooves 42 of the reinforcing structure 49 can also serve as drainage grooves, so that condensed water, defrosting water and the like on the fins 40 can be discharged along the reinforcing structure 49.

Alternatively, in the step S02 of punching the slot 44 in the fin body, the slot 48 may be formed by punching the periphery of the slot 44 in synchronization with the step of punching the slot 44, the slot 48 communicating with the slot 44.

As shown in fig. 16, the aperture 48 may be a slit, which may be within 0.1 mm, with an overall length of the aperture 48 of 0.2 mm to 0.5 mm; as shown in fig. 17, the aperture 48 may also be a slit, and the equivalent diameter of the slit may be 0.5 to 1 mm in volume diameter. Wherein, equivalent diameter refers to the diameter of circular tubes with equal hydraulic radius.

Through the process of punching the slot holes 44, the slot holes 48 are synchronously punched, so that the operation is convenient, and the production efficiency is improved.

It can be appreciated that by arranging the slits 48 in the circumferential direction of the slots 44, the slots 44 can be circumferentially expanded at the slits 48 during the process of inserting the flat tube 200 into the slots 44, so that the space of the slots 44 is increased, the difficulty of inserting the heat exchange tube into the slots 44 is reduced, the smooth insertion of the heat exchange tube into the slots 44 of the fins 40 is facilitated, the convenience of tube penetrating operation of the fins 40 is improved, and the production efficiency is improved. Especially when the fin assembly 400 needs more flat tubes 200 to be assembled, the plurality of flat tubes 200 penetrating into the fin assembly 400 can overlap errors of the slots 44 of the fin assembly 400, so that the tube penetrating operation difficulty of the last few flat tubes 200 is increased.

In addition, the hole slits 48 are formed in the fin body, and when condensed water or frosted water appears on the fin 40 or the heat exchange tube connected with the fin 40, the condensed water or the frosted water can be gathered by the hole slits 48, so that the drainage performance of the heat exchange assembly applied to the fin 40 is improved, the influence of accumulated water on the heat exchange assembly is reduced, and the heat exchange efficiency of the heat exchange assembly is improved.

Several implementations are given below for the sequential assembly of a plurality of fins 40 along a preset direction Z.

Detailed description of the preferred embodiments

In this specific embodiment, step S10 includes step S11, step S12, and step S13. Specifically, as shown in fig. 5, in step S11, a first circular tube and a second circular tube are provided, the first circular tube and the second circular tube are arranged at intervals along a second direction, and the first circular tube and the second circular tube are respectively arranged along a preset direction.

And S12, sleeving the fins on the first circular tube and the second circular tube. The first end 401 of each fin 40 is provided with a first round hole 431, the second end 402 of each fin 40 is provided with a second round hole 432, the slot 44 is located between the first round hole 431 and the second round hole 432, the first round tube 501 is inserted into the first round hole 431 of each fin 40, the second round tube 601 is inserted into the second round hole 432 of each fin 40, and the first end 401 and the second end 402 are opposite ends of the fin 40 in the second direction Y. Step S13, the flat tube sequentially passes through the slotted holes of each fin.

Corresponding to the above steps S11 and S12, step S20 includes step S21, and as shown in fig. 5, step S21 includes: and respectively connecting the two ends of the first circular tube, the second circular tube and the flat tube with the current collecting assemblies at the corresponding ends to obtain the heat exchange preassembly piece.

Specifically, in some implementations, as shown in fig. 14, 15 and 18, the current collecting assembly 300 includes two current collecting pipes 310, one end of the flat pipe 200, one end of the first round pipe 501, one end of the second round pipe 601 may be connected to one of the current collecting pipes 310 by welding, and the other end of the flat pipe 200, the other end of the first round pipe 501, and the other end of the second round pipe 601 may be connected to the other current collecting pipe 310 by welding. The first round tube 501 and the second round tube 601 can be communicated with the collecting assembly 300 at two ends, namely the collecting tube 310, and the first round tube 501 and the second round tube 601 can also be internally provided with a refrigerant flow channel 201 for refrigerant circulation. In the expansion joint process of the flat tube 200 and the fins 40, fluid can be introduced from one of the collecting pipes 310, and the fluid can flow into the flat tube 200, the first round tube 501 and the second round tube 601, so that the flat tube 200 and the fins 40 can be expanded and connected at the same time, the first round tube 501 and the second round tube 601 can be expanded and connected.

It should be noted that, the first round hole 431 and the second round hole 432 on the fin 40 may be formed on the fin body in the processing step of the fin 40, the first round hole 431 and the second round hole 432 may be formed by punching with a punching die, and the processing steps of the specific first round hole 431 and the specific second round hole 432 may be performed synchronously in step S02, or before or after step S02.

In this embodiment, the sequential assembly of the plurality of fins 40 along the preset direction Z is achieved through the steps S01 and S02, and in the assembly process of the plurality of fins 40, the first circular tube 501 and the second circular tube 601 may be used as guiding elements, so that the assembly efficiency of the plurality of fins 40 is improved.

In the step of expanding the flat tube 200 with the fins 40, it is common that all the flat tubes 200 are simultaneously performed. Taking the example that a plurality of flat tubes 200 are sequentially arranged along the vertical direction, a single fin 40 is an integral body from top to bottom, and for the fin 40 at the middle position, as the fin 40 is simultaneously subjected to the thrust caused by the expansion of the upper flat tube 200 and the lower flat tube 200 during tube expansion, the upper thrust and the lower thrust form balance, and the flat tube 200 can be in good contact connection with the fin 40; however, the flat tubes 200 at the uppermost and lowermost edges of the fins 40 are subjected to only one-directional expansion force and are not balanced by another-directional force, and therefore, deformation of the upper and lower edges of the fins 40 (arching of the fins 40) is liable to occur, which results in insufficient contact between the upper surface of the uppermost one of the flat tubes 200 and the fins 40 and between the lower surface of the lowermost one of the flat tubes 200 and the fins 40, resulting in an increase in contact thermal resistance and a decrease in heat exchange effect. Meanwhile, the local deformation of the upper surface of the uppermost flat tube 200 and the lower surface of the lowermost flat tube 200 is large (stress concentration), namely, the deformation of the upper surface of the uppermost flat tube 200 is larger than the deformation of the lower surface of the uppermost flat tube 200, the deformation of the lower surface of the lowermost flat tube 200 is larger than the deformation of the upper surface of the lowermost flat tube 200, the local deformation possibly exceeds the ideal deformation designed by the flat tube 200, the local pressure resistance of the flat tube 200 is poor, and hidden danger is brought to the reliability of the heat exchange assembly.

In the present embodiment, by providing circular holes at the uppermost and lowermost positions of the fins 40, in the step of expanding the flat tube 200 with the fins 40, the first circular tube 501 and the second circular tube 601 are compressed and expand around the same, which will react to the compression expansion of the flat tube 200, thereby achieving the effect of fixing the bottom and top fins 40. The probability of deformation arching of the first end 401 and the second end 402 of the fin 40 is reduced, and in the process of expanding the flat tube 200, the first round tube 501 of the fin 40 can apply a reaction force to the flat tube 200 adjacent to the first round tube 501, the second round tube 601 of the fin 40 can apply a reaction force to the flat tube 200 adjacent to the second round tube 601, the problem that local deformation is overlarge between the flat tube 200 adjacent to the first round tube 501 and the flat tube 200 adjacent to the second round tube 601, namely the flat tube 200 at the edge, is solved, and the contact tightness between the flat tube 200 at the edge and the fin 40 is improved, so that the contact thermal resistance is reduced, the heat exchange efficiency is improved, and the processing quality of a heat exchange assembly is improved.

Second embodiment

In this embodiment, assembling the plurality of fins 40 sequentially along the preset direction Z in step S10 may include step S14 and step S13.

As shown in fig. 6, step S14 is: the plurality of fins are sequentially arranged along a preset direction, a first positioning piece is assembled on the end face of the first end of the plurality of fins, and a second positioning piece is arranged on the end face of the second end of the plurality of fins. Wherein the first end 401 and the second end 402 are opposite ends of the fin 40 in the second direction Y. Step S13, the flat tube sequentially passes through the slotted holes of each fin.

Corresponding to the above step S14, step S20 includes step S22, and as shown in fig. 6, step S22 includes: and respectively connecting the two ends of the first positioning piece, the second positioning piece and the flat tube with the current collecting assemblies at the corresponding ends to obtain the heat exchange preassembly piece.

The first positioning piece 500 and the second positioning piece 600 can be detachably connected with the fins 40, and the fixing of the first positioning piece 500 and the second positioning piece 600 can be realized through the current collecting assembly 300, that is, both ends of the first positioning piece 500 and both ends of the second positioning piece 600 are connected with the current collecting pipe 310, and specifically, the fixing connection can be realized through welding or through bolts and the like.

Wherein, in the step of processing the fin 40, as shown in fig. 12 and 13, the grooves 42 may be punched on the first end 401 and the second end 402 of the fin body by using a punching die, and the first positioning member 500 and the second positioning member 600 may be rod members, which may be inserted into the grooves 42 of the respective ends.

In this embodiment, before the fin assembly 400 passes through the flat tube 200, the first positioning element 500 and the second positioning element 600 are assembled at the two ends of the fin body, so that when the flat tube 200 is expanded and connected with the fins 40, the positioning elements fix the upper plane and the lower plane of the fin assembly 400, so that the arch deformation of the upper plane and the lower plane of the fins 40 caused by the tube expansion action of the flat tube 200 can be effectively resisted, the problem that the local tube expansion deformation of the uppermost flat tube 200 and the lowermost flat tube 200 caused by uneven stress on the upper surface and the lower surface is large is solved, and the overall pressure-resistant reliability of the heat exchanger after the tube expansion of the flat tube 200 is ensured. In other words, in this embodiment, by providing concave cutouts at the uppermost and lowermost positions of the fins 40, the first positioning member 500 and the second positioning member 600 can be inserted into the cutouts before the flat tube 200 is expanded, and the upper and lower planes of the plurality of stacked fins 40 are integrally fixed, so that the upper and lower planes of the fins 40 are not or substantially not deformed by arching during the expansion.

It should be noted that, the first embodiment and the second embodiment may be used in combination, and the step S13 may be disposed between the step S11 and the step S12.

In some embodiments, there is also provided a heat exchange assembly assembled by the method of assembling a heat exchange assembly as set forth in the present application or any of the embodiments of the present application.

In some embodiments of the present application, a microchannel heat exchanger is also provided, comprising a housing and a heat exchange assembly as provided herein or in any embodiment thereof, the heat exchange assembly being disposed within the housing.

As shown in fig. 18, the manifold assembly 300 may be directly plugged with the flat tube 200. The current collecting assembly 300 may include two current collecting pipes 310, a plurality of flat pipes 200 are disposed between the two current collecting pipes 310, and two ends of any one flat pipe 200 are connected and communicated with the corresponding current collecting pipe 310 through a adapting component.

Some embodiments of the present application further provide a heating ventilation device, including the microchannel heat exchanger provided in the embodiments of the present application.

The heating and ventilation equipment can be an air conditioner, and the micro-channel heat exchanger can be used as an indoor unit of the air conditioner and also can be used as an outdoor unit. The microchannel heat exchanger can be used as an evaporator or a condenser.

The air conditioner of the embodiment also comprises a compressor, an expansion valve, a shell and other conventional components of the air conditioner.

The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of assembling a heat exchange assembly, comprising:

for said preset pressure, < >>

For the yield strength of the material of the flat tube, < >>

For the thickness of the rib plate, < > a->

Is the dimension of the spacing of the two sidewalls in the second direction.

2. The method of assembling a heat exchange assembly of claim 1, wherein the web has a thickness

In the interval 0.7 mm to 3.5 mm.

3. The method of assembling a heat exchange assembly of claim 2, wherein the flat tube has a wall thickness that satisfies:

is the wall thickness of the flat tube.

4. A method of assembling a heat exchange assembly according to claim 3 wherein the flat tube has a wall thickness

In the interval 0.3 mm to 0.4 mm;

And/or the thickness of the rib plate

In the interval 0.2 mm to 0.3 mm;

and/or the distance between two adjacent rib plates along the first direction

In the interval of 0.6 mm to 1.3 mm;

and/or the spacing dimension of the two side walls along the second direction

In the interval 0.75 mm to 1.5 mm.

5. The method of assembling a heat exchange assembly of claim 4, wherein the flat tube has a width Wo in the first direction in the interval of 12 mm to 32 mm.

6. The method of assembling a heat exchange assembly according to any one of claims 1-5, further comprising an assembling step of the heat exchange pre-assembly, the assembling step of the heat exchange pre-assembly comprising: sequentially assembling a plurality of fins along the preset direction, sequentially penetrating the flat tubes through the slotted holes of each fin, and respectively connecting two ends of the flat tubes penetrating through the slotted holes with a current collecting assembly to obtain the heat exchange preassembly, wherein the two ends of the flat tubes are communicated with the corresponding current collecting assemblies;

7. The method of assembling a heat exchange assembly of claim 6, wherein the fluid is a gas or a liquid.

8. The method of assembling a heat exchange assembly of claim 6, wherein assembling the plurality of fins sequentially in the predetermined direction comprises:

the both ends of will wear to establish to the flat pipe of slotted hole are connected with the mass flow subassembly respectively, include: and connecting the two ends of the first circular tube, the second circular tube and the flat tube with the current collecting assemblies at the corresponding ends respectively.

9. The method of assembling a heat exchange assembly of claim 6, wherein assembling the plurality of fins sequentially in the predetermined direction comprises: sequentially arranging a plurality of fins along the preset direction, assembling a first positioning piece on the end surfaces of the first ends of the fins, and arranging a second positioning piece on the end surfaces of the second ends of the fins, wherein the first ends and the second ends are opposite ends of the fins in the second direction;

the both ends of will wear to establish to the flat pipe of slotted hole are connected with the mass flow subassembly respectively, include: and connecting the two ends of the first positioning piece, the second positioning piece and the flat tube with the current collecting assembly at the corresponding end respectively.

10. The method of assembling a heat exchange assembly of claim 6, further comprising the step of machining fins prior to sequentially assembling the plurality of fins in the predetermined direction, the step of machining fins comprising:

11. The method of assembling a heat exchange assembly of claim 10, wherein said stamping said slots into said fin body further comprises: and roll-coating a hydrophilic layer on the fin body.

12. The method of assembling a heat exchange assembly of claim 10, wherein the step of machining fins further comprises:

13. The method of assembling a heat exchange assembly according to claim 10, wherein in the step of punching the slot holes in the fin body, hole slits are punched in the periphery of the slot holes in synchronization, the hole slits being in communication with the slot holes.

14. A heat exchange assembly, characterized in that it is assembled by the assembly method of a heat exchange assembly according to any one of claims 1-13.

15. A microchannel heat exchanger comprising:

a housing;

the heat exchange assembly of claim 14 disposed within the housing.

16. A heating ventilation apparatus comprising the microchannel heat exchanger of claim 15.