阅读说明：本技术 一种铝制式空冷器多孔扁管与管板的连接结构 (Connecting structure of porous flat tube and tube plate of aluminum air cooler ) 是由 郝开开 孙海生 侯霄艳 刘一凡 姚伟莹 于 2019-09-11 设计创作，主要内容包括：本发明公开了一种铝制式空冷器多孔扁管与管板的连接结构,包括若干多孔扁管、管板、管箱及密封板,所述多孔扁管插设在管板和密封板上的管孔内,并与密封板管孔的翻边固接形成管头；所述密封板的四周与管板固接,管板与多孔扁管之间注入密封胶,管箱与管板四周固接形成铝制式空冷器多孔扁管与管板的连接结构。多孔扁管与密封板固接实现结构的密封作用,管板与管箱的固接起到承压作用,因此密封板与多孔扁管钎焊接头的设计不受管板厚度及管板加工精度的制约,可实现管头钎焊工艺所需搭接长度及搭接间隙的最优化设计。本发明具有各组件加工制造简单,管头焊接合格率高,承载、抗振及密封性能好等优点。(The invention discloses a connecting structure of a porous flat pipe and a pipe plate of an aluminum air cooler, which comprises a plurality of porous flat pipes, a pipe plate, a pipe box and a sealing plate, wherein the porous flat pipes are inserted into pipe holes in the pipe plate and the sealing plate and are fixedly connected with flanges of the pipe holes of the sealing plate to form a pipe head; the periphery of the sealing plate is fixedly connected with the tube plate, sealant is injected between the tube plate and the porous flat tubes, and the tube box is fixedly connected with the periphery of the tube plate to form a connecting structure of the porous flat tubes and the tube plate of the aluminum air cooler. The porous flat tube is fixedly connected with the sealing plate to realize the sealing effect of the structure, and the fixedly connected tube plate and the tube box play a role in bearing pressure, so that the design of the brazing joint of the sealing plate and the porous flat tube is not limited by the thickness of the tube plate and the processing precision of the tube plate, and the optimal design of the required lap joint length and the lap joint gap of the tube head brazing process can be realized. The invention has the advantages of simple processing and manufacturing of each component, high welding qualification rate of the pipe head, good bearing, vibration resistance and sealing performance and the like.)

1. A connecting structure of porous flat tubes and tube plates of an aluminum air cooler comprises a plurality of porous flat tubes, tube plates and tube boxes, and is characterized by comprising a sealing plate (3), wherein the porous flat tubes (1) are inserted into tube holes in the tube plates (2) and the sealing plate (3) and fixedly connected with flanges (301) of the tube holes in the sealing plate (3) to form tube heads; the periphery of the sealing plate (3) is fixedly connected with the tube plate (2), sealant is injected between the tube plate (2) and the porous flat tube (1), and the tube box (4) is fixedly connected with the periphery of the tube plate to form a connecting structure of the porous flat tube and the tube plate of the aluminum air cooler.

2. The connecting structure of the porous flat tubes and the tube plates of the aluminum air cooler as claimed in claim 1, wherein the sizes of the tube holes on the sealing plate (3) are +0.4mm +/-0.2 mm, the thickness of the sealing plate is 2-5mm, and the height h after flanging is 3-5 times the thickness of the wall of the porous flat tube, and the maximum thickness is 15 mm.

3. the connection structure of the porous flat tubes and the tube plates of the aluminum type air cooler according to claim 1,

The size of the pipe hole formed in the pipe plate (2) is +3mm of the diameter of the porous flat pipe, and the allowable deviation is +/-1 mm.

4. The connecting structure of the porous flat tubes and the tube plates of the aluminum air cooler according to claim 1, wherein the sealing plates (3) are positioned on the inner side of the tube plates, and the tube heads formed by the porous flat tubes (1) and the sealing plates (3) and the welding seams formed by the sealing plates (3) and the tube plates (2) are contained in the cavities formed by the tube plates (2) and the tube boxes (4).

Technical Field

The invention relates to the technical field of heat exchange equipment, in particular to a connecting structure of a porous flat tube and a tube plate of an aluminum air cooler.

Background

The air cooler is widely applied to the fields of petroleum, chemical industry, energy, metallurgy, aerospace and the like due to strong cooling and heat dissipation capabilities and water resource saving. The air cooler uses the ambient air as a cooling medium, and transversely skims the outside of the fin tube to cool or condense the high-temperature process fluid in the tube, so as to increase the heat exchange efficiency, the fluidity of the air is enhanced by a fan under the normal condition, and meanwhile, the fins are additionally arranged on a base tube to achieve the purpose of enhancing the heat transfer. According to the different shapes of the base tubes, the finned tubes comprise round finned tubes, elliptical finned tubes, flat tube finned tubes and the like, and compared with the round finned tubes and the elliptical finned tube flat tube finned tubes, the rear tube reflux areas and the windward areas of the round finned tubes and the elliptical finned tube flat tube finned tubes are much smaller, the flow resistance of the air side is effectively reduced, and the energy consumption is reduced. Therefore, the application and research of the flat tube finned tube are increasing.

The section of the aluminum alloy porous flat tube is similar to a harmonica, the porous flat tube generally has 5-25 holes, the wall thickness is 0.6-1.5mm, the height a is 4-10mm, and the width b is 14-210 mm. The aluminum alloy porous flat tube has the advantages of small wall thickness material consumption, high hole number and pressure bearing, no defect of welded microstructure, and great application in automobile air conditioner radiators. The collecting main in the radiator at present uses circular high frequency welding body as the main, and this body outside evenly sets up the porous flat tube mounting hole that porous flat tube inserted and establish, and its inside equipartition has refrigerant liquid business turn over interface. The pipe body of the collecting pipe is formed by pressing a layer of low-melting-point aluminum alloy on one side of high-melting-point aluminum alloy to form a composite plate, and rolling and welding the composite plate. Its handling capacity of air cooler that uses among the industrial device is big, and the operating mode is more complicated, and along with the increase of porous flat tub of pipe specification and the improvement of design pressure, the thickening of aluminum alloy tube sheet is higher to the required precision of the tube hole of seting up. The traditional connecting structure has complex process, high technical requirement and high cost.

Meanwhile, the overlapping length of the porous flat tube and the tube plate is increased due to the thickening of the tube plate, the capillary action of a welding seam is damaged, a welding gap cannot be filled with brazing filler metal, and the welding quality of a brazed joint of the porous flat tube and the tube plate cannot meet the requirement. When the porous flat tube and the tube plate are welded by adopting fusion welding (TIG, MIG), the tube wall of the porous flat tube is too thin and the tube plate is thick, so that the tube wall is easy to burn through during welding, the welding seam is easy to have the defects of air holes and the like, the one-time qualification rate is low, and the formed tube head has small welding seam area and poor bearing, vibration resistance, sealing property and the like.

Disclosure of Invention

The invention provides a connecting structure of a porous flat pipe and a pipe plate of an aluminum air cooler, which is used for improving the welding quality and the bearing capacity of a welding seam between the porous flat pipe and the pipe plate.

the invention realizes the technical purpose through the following technical scheme:

a connecting structure of a porous flat tube and a tube plate of an aluminum air cooler comprises a plurality of porous flat tubes, a tube plate and a tube box, and comprises a sealing plate, wherein the porous flat tubes are inserted into tube holes in the tube plate and the sealing plate and fixedly connected with flanges of the tube holes of the sealing plate to form a tube head; the periphery of the sealing plate is fixedly connected with the tube plate, sealant is injected between the tube plate and the porous flat tubes, and the tube box is fixedly connected with the periphery of the tube plate to form a connecting structure of the porous flat tubes and the tube plate of the aluminum air cooler.

The size of the pipe hole on the sealing plate is plus 0.4mm plus or minus 0.2mm of the size of the porous flat pipe, the thickness of the sealing plate is 2-5mm, and the height h after flanging is 3-5 times of the thickness of the wall of the porous flat pipe, and the maximum thickness is 15 mm.

The size of the pipe hole formed in the pipe plate is +3mm of the diameter of the porous flat pipe, and the allowable deviation is +/-1 mm.

The sealing plate is located on the inner side of the tube plate, and a tube head formed by the porous flat tube and the sealing plate and a welding line formed by the sealing plate and the tube plate are contained in a containing cavity formed by the tube plate and the tube box.

The multi-hole flat pipe and the sealing plate are welded to realize the sealing function of the structure, the pipe plate and the pipe box are welded to play a role in bearing pressure, the multi-hole flat pipe and the pipe plate are not directly welded but are transited through the sealing plate, the design of the sealing plate and the multi-hole flat pipe brazing joint is not limited by the thickness of the pipe plate and the machining precision of the pipe plate, the optimal design of the lap joint length and the lap joint gap required by the pipe head brazing process can be realized, and the multi-hole flat pipe brazing joint has the advantages of simplicity in machining and manufacturing of each part, high pipe head welding qualification rate, large pipe head welding.

drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is a schematic view of the sealing plate of the present invention;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;

FIG. 6 is a schematic structural view of a porous flat tube;

Numbering in the figures:

1. the cooling structure comprises a porous flat pipe, 2 parts of a pipe plate, 3 parts of a sealing plate, 4 parts of a pipe box, 101 parts of a medium to be cooled, 102 parts of air, 201 parts of pipe plate pipe holes and porous flat pipes, 202 parts of pipe plate and sealing plate gaps, 203 parts of sealing plate pipe holes and porous flat pipes, and 301 parts of flanges.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1 to 3: a connecting structure of a porous flat tube and a tube plate of an aluminum air cooler comprises the porous flat tube 1, the tube plate 2, a sealing plate 3 and a tube box 4. The multi-hole flat tubes 1 and the fins are assembled, the multi-hole aluminum flat tubes are sequentially inserted into tube plates, tube plate tube holes and sealing plate tube holes formed in sealing plates, the multi-hole flat tubes exceed the sealing plates by 3-5mm, a certain operation space is reserved between the tube plates and the sealing plates, brazing paste (or a preset brazing ring) is injected into gaps 203 between the sealing plate tube holes and the multi-hole flat tubes for brazing, lap joint tube head welding seams are formed at the gaps between the sealing plate tube holes and the multi-hole flat tubes after brazing, the tube plates which are not welded with the multi-hole flat tubes are attached to the sealing plates, gaps between the tube plates and the sealing plates are eliminated as far as possible, and the peripheries of the sealing plates and the tube plates are. And then, sealant is injected into the gap 201 between the tube hole of the tube plate and the sealing plate on the outer side of the tube plate to eliminate the gap, so that impurities in the air cannot enter the gaps between the tube plate and the sealing plate and between the tube plate and the porous flat tube. And then the tube box 4 and the periphery of the tube plate are welded to form a connecting structure of the porous flat tube and the tube plate of the aluminum air cooler.

as shown in fig. 4 to 6, the tube hole on the sealing plate 3 is formed by stamping and has a flange 301, the size of the tube hole is +0.4mm ± 0.2mm of the size of the porous flat tube, the thickness of the sealing plate is 2-5mm, the thickness h of the flanged porous flat tube is 3-5 times the thickness of the wall of the porous flat tube in order to ensure the bearing capacity of the brazed lap joint, the maximum thickness is not more than 15mm, and the porous flat tube and the sealing plate are both made of aluminum alloy. The brazing pipe head formed by the porous flat pipe and the sealing plate is good in welding quality and high in bearing capacity. When the size of the porous flat pipe is determined, the structural parameters of the sealing plate determine the joint clearance and the lap joint length of the brazing pipe head. The size of the pipe hole of the sealing plate directly influences the joint gap after assembly, the smaller the gap is, the greater the assembly difficulty is, meanwhile, the brazing is to make the liquid brazing filler metal fill the gap by virtue of capillary action, the too small gap prevents the brazing filler metal from flowing into the gap, and slag inclusion or non-penetration in the pipe head is caused; too large gaps destroy the capillary action of the brazing seams, and the brazing filler metal cannot fill the gaps. The height h after the flanging of the sealing plate determines the brazing overlapping length of the tube head, the capillary action of brazing filler metal in the gap is considered, the overlapping length is matched with the gap of the joint, the larger the gap is in a certain range, the longer the overlapping length is, and in order to ensure that the tube head has the bearing capacity equal to or higher than that of a tube, the minimum value design of the overlapping length is subjected to theoretical calculation and verification.

The pipe holes formed in the pipe plate 2 are different from the pipe holes of the sealing plate (3) in allowable machining precision, the pipe holes formed in the pipe plate are larger in size, the size of the pipe holes formed in the pipe plate is +3mm of the diameter size of the porous flat pipe, and the allowable deviation is +/-1 mm. The larger clearance is beneficial to pipe penetration assembly, the lower deviation requirement is not limited by the processing capacity, and the injected sealant can eliminate the final clearance.

The sealing plate 3 is positioned on the inner side of the tube plate, and a tube head formed by the porous flat tube 1 and the sealing plate 3 and a welding seam formed by the sealing plate 3 and the tube plate 2 are contained in a containing cavity formed by the tube plate 2 and the tube box 4. All welding lines formed by the sealing plates are wrapped in the accommodating cavities formed by the tube plates 2 and the tube boxes 4, and the medium to be cooled 101 enters the tube boxes and is distributed into each porous flat tube, so that the medium to be cooled cannot enter gaps 201 between the tube plates and the porous flat tubes and gaps 202 between the tube plates and the sealing plates, and the head of the air cooler can bear higher pressure on the side of the medium to be cooled. The air cannot be completely sealed by sealant at the gap 201 between the tube holes of the tube plate and the sealing plate outside the tube plate, the gaps between the tube plate and the sealing plate and between the tube plate and the porous flat tubes are filled with air to form a cavity, the cavity is different from the side of a medium to be cooled, the air side of the air cooler is normal pressure, and the formed cavity cannot influence the sealing performance of the structure. Because the porous flat tube and the tube plate are not directly welded but are transited through the sealing plate, the design of the brazing joint of the sealing plate and the porous flat tube is not limited by the thickness of the tube plate and the processing precision of the tube plate, and the optimal design of the required lap joint length and the lap joint gap of the tube head brazing process can be realized.

the thickness of the pipe plate is determined by calculation according to the design pressure of the side of the air cooler to be cooled, the size of the pipe hole formed in the pipe plate can be +3mm of the diameter of the porous flat pipe, and the allowable deviation is +/-1 mm.

the invention has the advantages of simple processing and manufacturing of each part, high tube head welding qualification rate, large tube head welding seam area, good bearing, vibration resistance and sealing performance and the like. Meanwhile, the implementation of the invention is not limited by the thickness of the tube plate and the processing precision of the tube plate, the optimization of the lapping length and the lapping gap required by the tube head brazing process can be realized, and the invention is an economic and reliable connecting structure.