CN210833213U - Connecting structure of porous flat tube and tube plate of aluminum air cooler - Google Patents
Connecting structure of porous flat tube and tube plate of aluminum air cooler Download PDFInfo
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- CN210833213U CN210833213U CN201921510744.2U CN201921510744U CN210833213U CN 210833213 U CN210833213 U CN 210833213U CN 201921510744 U CN201921510744 U CN 201921510744U CN 210833213 U CN210833213 U CN 210833213U
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Abstract
The utility model discloses a connecting structure of a porous flat tube and a tube plate of an aluminum air cooler, which comprises a plurality of porous flat tubes, a tube plate, a tube box and a sealing plate, wherein the porous flat tubes are inserted into tube holes on the tube plate and the sealing plate and are fixedly connected with a flanging of the tube hole 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 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 utility model has the advantages of each subassembly manufacturing is simple, and the tube head welding qualification rate is high, bears, anti vibration and sealing performance are good.
Description
Technical Field
The utility model relates to a indirect heating equipment technical field especially relates to a porous flat pipe of aluminium system formula air cooler and connection structure of tube sheet.
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.
SUMMERY OF THE UTILITY MODEL
The utility model provides a connection structure of porous flat pipe of aluminium system formula air cooler and tube sheet for improve the welding quality and the bearing capacity of porous flat pipe and tube sheet welding seam.
The utility model discloses a following technical scheme realizes above-mentioned technical purpose:
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 utility model discloses well porous flat pipe and the sealed effect of closing plate welding implementation structure, the tube sheet plays the pressure-bearing effect with the welding of pipe case, its porous flat pipe is not directly welded but passes through the closing plate transition with the tube sheet, the closing plate does not receive the restriction of tube sheet thickness and tube sheet machining precision with the design of porous flat pipe soldered joint, can realize the optimal design in the required overlap joint length of tube head brazing technology and overlap joint clearance, it is simple to have each parts manufacturing, the tube head welding qualification rate is high, it forms the tube head welding seam area of overlap joint form big, bear, advantages such as anti vibration and sealing performance are good.
Drawings
FIG. 1 is a three-dimensional structure 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 structural 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 present invention will be further explained 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 utility model has the advantages of each parts manufacturing is simple, and the tube head welding qualification rate is high, and tube head welding seam area is big, bears, anti vibration and sealing performance are good. Simultaneously the utility model discloses an implement not receiving the restriction of tube sheet thickness and tube sheet machining precision, can realize the optimization of the required overlap joint length of tube head brazing process and overlap joint clearance, be an economy, reliable connection structure.
Claims (4)
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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921510744.2U CN210833213U (en) | 2019-09-11 | 2019-09-11 | Connecting structure of porous flat tube and tube plate of aluminum air cooler |
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| CN201921510744.2U CN210833213U (en) | 2019-09-11 | 2019-09-11 | Connecting structure of porous flat tube and tube plate of aluminum air cooler |
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| CN210833213U true CN210833213U (en) | 2020-06-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110553533A (en) * | 2019-09-11 | 2019-12-10 | 上海蓝滨石化设备有限责任公司 | Connecting structure of porous flat tube and tube plate of aluminum air cooler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110553533A (en) * | 2019-09-11 | 2019-12-10 | 上海蓝滨石化设备有限责任公司 | Connecting structure of porous flat tube and tube plate of aluminum air cooler |
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