KR100468805B1 - Manufacturing Method of Flat Heat Exchanger Tube - Google Patents

Abstract

It has a top and bottom wall, the left and right both sidewalls extending between the left and right side edges of the upper and lower walls, and a plurality of reinforcing walls extending between the upper and lower walls and extending in the longitudinal direction and spaced from each other, and parallel to the inside A method of manufacturing a flat heat exchanger tube in which a fluid passage of a gas is formed, comprising: a first pipe constituting member made of aluminum including a lower wall forming portion and a plurality of reinforcing wall forming portions which are raised upwardly and integrally molded; And a step of soldering and integrating the second tube constituting member made of aluminum including at least a top wall forming portion formed of a pressing plate material having a lead material layer on the lower surface thereof, each of which is formed on the bottom surface of the upper wall forming portion of the second tube constituting member. At least one ridge for increasing the soldering strength extending in the longitudinal direction in a portion corresponding to the reinforcing wall forming portion of After the constituent members were fixed temporarily by applying a force from the vertical state it is soldered to the two component members.

Description

Manufacturing method of flat heat exchanger tube

The present invention relates to a method for manufacturing a flat heat exchanger tube, and more particularly, to a method for manufacturing a flat heat exchanger tube applied to a heat exchanger such as a condenser or an evaporator used in a vehicle cooler.

As a condenser for a vehicle cooler in recent years, as disclosed in Japanese Patent Application Publication No. 91-45300, a pair of headers arranged parallel to the left and right at intervals from each other and a parallel type in which both ends are connected to two headers, respectively Flat heat exchanger tube, corrugated fins disposed in the ventilation gap between adjacent heat exchanger tubes and soldered to two heat exchanger tubes, an inlet tube connected to the upper end of the left header, and an outlet tube connected to the lower end of the right header And a left partition plate provided inside at a position higher than the middle of the left header, and a right partition plate provided inside at a position lower than the middle of the right header, and including an inlet pipe and a left partition plate. The number of heat exchange tubes between the left partition plate and the right partition plate and the number of heat exchange tubes between the right partition plate and the outlet pipe Condensers, so called parallel flow or multi-flow type, are sequentially used, which are sequentially reduced from the gas stream flowing in from the inlet tube and flow in a meandering manner through the condenser until the liquid phase from the outlet tube flows out. . Such a condenser has been used in place of a conventional serpentine-type condenser to realize high performance, low pressure loss and ultra compactness.

Since the high-pressure gas refrigerant is introduced into the flat heat exchanger tube used in the condenser described above, such flat heat exchanger tube is required to be pressure resistant. In order to meet such demands and to improve heat exchange efficiency, an aluminum hollow extruded shape member having a flat upper and lower walls and a reinforcing wall extending in the longitudinal direction between the upper and lower walls is used as the heat exchanger tube. By the way, in connection with the improvement of heat exchange efficiency and the compactness of a condenser, it is preferable that the flat heat exchanger tube is thin in thickness and as low as possible in height. However, when the extruded shape is manufactured, there are limitations in lowering the height of the tube and reducing the thickness due to limitations in the extrusion technology.

In order to solve such a problem, as disclosed in Japanese Patent Application Laid-Open No. 97-281373, the upper and lower walls, the left and right sidewalls extending between the left and right side edges of the upper and lower walls, and the upper and lower walls A method of manufacturing a flat heat exchanger tube having a plurality of reinforcing walls extending in the longitudinal direction and spaced apart from each other and having parallel fluid passages formed therein, wherein the lower wall forming portion and the lower wall forming portion are raised upwardly. A first tubular member made of aluminum comprising a plurality of reinforcing wall forming parts integrally formed therein, and a pressing plate having a lead material layer on a lower surface thereof, and interposed between both sidewall forming parts of the first tubular member. The manufacturing method of the flat heat exchanger tube which solders and integrates the 2nd tube structural member made from aluminum containing an upper wall formation part is known.

However, since the above-mentioned 1st tubular structural member is obtained by rolling an aluminum plate by the upper and lower rolling rolls in which one roll has a parallel annular groove, as shown in FIG. 20, the 1st tubular structural member 50 is shown. ), The upper edge of the reinforcing wall forming portion 51 is not horizontal, and may be inclined, for example, from one end side to the other end side. As a result, when combining the 1st tubular structural member 50 and the 2nd tubular structural member 52, the lower surface of the upper wall formation part 53 of the 2nd tubular structural member 52, and the 1st tubular structural member 50 are shown. The combination combining the upper edges of the reinforcing wall forming portion 51 of () is in contact only at one end portion, and a small gap 54 is present at the other portion, resulting in the following problems. That is, the lead material forming the lead material layer 55 on the lower surface of the upper wall forming portion 53 is melted at the time of soldering so that the lower surface of the upper wall forming portion 53 and the upper edge of the reinforcing wall forming portion 51 first contact each other. Collected in the part being formed and then filled in the gap 54 to sequentially fill the gap, and due to the influence of the oxide film on the surface of the lead material layer 55, the flowability of the molten lead material is insufficient. As a result, the entirety of the gap 54 may not be filled, and thus a fillet may not be formed over the entire length of the reinforcing wall forming part 51.

In particular, as shown in FIG. 21, each reinforcing wall forming portion 51 has a plurality of cutouts 56 spaced in the longitudinal direction at its upper edge, and includes a first tubular member 57 and a first tube. In the case of forming the communication hole for connecting the parallel coolant passages by soldering the two pipe member 52 and closing the opening of the cutout portion 56 by the upper wall forming part 53, the first pipe member A situation arises in which the height positions of the upper edge portions of the portions 58A, 58B, 58C between the adjacent cutouts 51 of the reinforcing wall forming portion 51 of 57 are not all the same, and are different from each other. Only the upper edge portion of the second tube constituting member 52 contacts the upper wall forming portion 53, and in other portions 58B and 58C, there is a slight gap between the upper edge portion and the upper wall forming portion 53. ) Will exist. The part where the clearance 59 exists between the upper edge part of the reinforcement wall formation part 51 of the 1st tubular structural member 57, and the upper wall formation part 51 of the 2nd tubular structural member 52 at the time of soldering is carried out. Not soldered As a result, the brazing strength between the upper wall forming portion 53 of the second tube forming member 52 and the reinforcing wall forming portion 51 of the first tube forming member 57 is insufficient, and the flat heat exchanger tube thus manufactured is manufactured. This required pressure resistance cannot be satisfied.

Therefore, in order to solve such a problem, it is conceivable to thicken the thickness of the lead material layer on the lower surface of the second pipe constituent member. In this case, the lead material flows during soldering, and as a result, the fluid passage There is a concern that the passage resistance of the cross section decreases, resulting in increased passage resistance, or sometimes the fluid passage being closed. In addition, when there is a notch in the reinforcing wall forming portion, there is a fear that the communication hole is closed.

It is an object of the present invention to provide a method for producing a flat heat exchanger tube without various problems associated with the aforementioned soldering and having sufficient pressure resistance.

The present invention includes an upper and lower walls, both left and right side walls extending between the left and right side edges of the upper and lower walls, and a plurality of reinforcing walls extending between the upper and lower walls and extending in the longitudinal direction and spaced from each other, A method of manufacturing a flat heat exchanger tube having a parallel fluid passage formed therein, comprising: a first tube constituting member made of aluminum including a lower wall forming portion and a plurality of reinforcing wall forming portions which are raised upwardly and integrally formed; And a step of soldering and integrating a second tube constituting member made of aluminum including an upper wall forming portion formed of a pressing plate material having a lead material layer on at least a lower surface of the upper and lower surfaces. At least one ridge for increasing the soldering strength extending in the longitudinal direction in a portion corresponding to each reinforcing wall forming portion of the It is characterized by soldering two structural members, after temporarily fixing two structural members in the state which applied the force from the upper and lower sides. By such a method, even if there is a portion where a gap exists between the lower surface of the upper wall forming portion of the second pipe forming member and the upper edge of the reinforcing wall forming portion of the first pipe forming member, the size of the gap is such that the protrusion of the convex strip is increased. If it is less than or equal to the height, such a portion of the reinforcing wall forming portion is soldered to the convex strip in contact with the ridge of the lower surface of the upper wall forming portion, so that no soldering failure occurs in the flat heat exchange tube as a whole.

Preferably, both corners of the upper end of the reinforcing wall forming portion and the cross section of the tip portion of the ridge are formed in an arc shape at the same time, and the ridges are provided in pairs in the portions corresponding to the respective reinforcing wall forming portions, while temporarily providing two constituent members. Each ridge is positioned so that the transverse inclined portion of the tip portion of each ridge abuts on one corner portion of the reinforcing wall forming portion when fixed to the ridge. With this configuration, when the two structural members are temporarily fixed in a state where a force is applied from above and below, at least one of the phenomenon in which the pair of ridges are pushed and widened by the upper end of the reinforcing wall forming portion and the corner portions of the upper end thereof are deformed. Since any one of them occurs, the contact area between the reinforcing wall forming portion and the ridge becomes large, and the soldering becomes good.

As for the height of protrusion of a ridge, about 10-200 micrometers is preferable. Gaps between the lower surface of the upper wall forming portion of the second pipe member and the upper edge of the reinforcing wall forming portion due to various differences in the height positions of the portions between adjacent cutouts in the reinforcing wall forming portion. Since the size of is not smaller than 10 μm, if it is lower than 10 μm, the upper edge portion of the reinforcing wall forming portion of the first pipe member may not contact the convex strip when temporarily fixing the two component members. If it is higher than 占 퐉, there is a fear that it is impossible to temporarily fix the two structural members.

In addition, it is preferable to form a ridge for increasing heat transfer area in advance in a portion other than the portion corresponding to the reinforcing wall forming portion at the lower surface of the upper wall forming portion of the second pipe constituting member, thereby increasing the heat exchange efficiency of the heat exchanger tube. .

In addition, the present invention has a top and bottom wall, the left and right both sidewalls that extend between the left and right side edges of the upper and lower walls, and a plurality of reinforcement walls that extend between the upper and lower walls and extend in the longitudinal direction and are spaced apart from each other, A method of manufacturing a flat heat exchanger tube in which a parallel fluid passage is formed therein, comprising: a first tube structure made of aluminum including a plurality of reinforcing wall forming portions which are elevated upwardly and integrally formed by being raised upward from the lower wall forming portion and the lower wall forming portion; Integrates and integrates a second tube constituting member made of aluminum including a member and an upper wall forming portion formed of a pressing plate having a lead material layer on at least a lower surface of the upper and lower surfaces and interposed between both sidewall forming portions of the first tube constituting member. In which the bottom surface of the upper wall forming portion of the second pipe constituting member is made into a rough surface. After the two components are temporarily fixed, the two components are soldered. Thereby, the fluidity | liquidity of the lead at the time of soldering becomes favorable. Therefore, the upper edge portion of the reinforcing wall forming portion does not become horizontal, for example, is inclined from one end side to the other end portion, and when the two structural members are combined, the upper wall forming portion of the second tube structural member and the reinforcing wall of the first tube structural member Although the upper edge of the forming part contacts only one end of the combination and there is a slight gap in the other part, the molten lead material first collects in the contact area between the upper wall forming part and the reinforcing wall forming part, and then flows into the gap to sequentially It fills the whole gap. As a result, fillets are formed between the reinforcing wall forming portion and the upper wall forming portion over the entire length of the reinforcing wall forming portion.

Further, it is preferable that each reinforcing wall forming portion has a plurality of cutouts at intervals in the longitudinal direction at the upper edge thereof, and the two components are soldered to close the openings of the cutouts by the upper wall forming portion. Communication holes are formed which allow the fluid passages to communicate with each other, thereby improving heat exchange efficiency.

The communication holes in the reinforcing wall allow the refrigerant flowing through the parallel fluid passages to flow in the width direction of the flat heat exchanger tube, and mix the refrigerants so that the temperature difference between the refrigerants in the fluid passages is eliminated. In the wall, it is preferable that the opening ratio, which is the ratio of all communication holes to the reinforcing wall, is 10 to 40%. Such an opening ratio is a ratio which can make thermal conductivity favorable and can further improve the heat exchange efficiency of a heat exchanger tube. If the aperture ratio is less than 10%, the thermal conductivity does not increase, and if it exceeds 40%, the thermal conductivity does not increase, and only the coefficient of friction increases, so that the aperture ratio in the above range is preferable. In the range of 10 to 40%, the opening ratio is particularly preferably 10 to 30%, most preferably about 20%. It is preferable that the communication holes opened in the plurality of reinforcing walls are arranged zigzag in plan view.

Further, it is preferable that the rising wall of the same height as the reinforcement wall is raised and integrally formed at the left and right side edges of the lower wall forming portion of the first pipe constituting member, and at the same time, an inclined surface which is upwardly outwardly formed on the lower surfaces of the left and right side walls. The vertical wall overlapping the outer side of the rising wall whose vertical length is larger than the height of the rising wall and the outer side of the upper wall forming part of the pipe forming member is formed integrally, and the first pipe forming member and the second pipe forming member are integrally formed. In the case of temporarily fixing the lower ends of the two vertical walls are bent on the inclined surface upwardly to overlap or to form one surface with the lower wall forming portion. This eliminates the need for a jig or the like for temporarily fixing the two structural members. Further, in the produced flat heat exchanger tube, since the left and right side walls have a double structure, the pressure resistance of the portion is improved.

Moreover, it is preferable that the pitch of the reinforcement wall in the width direction of a heat exchanger tube is 4 mm or less. If the pitch of the reinforcing wall exceeds 4 mm, the heat exchange efficiency deteriorates. Moreover, it is preferable that the height of a reinforcement wall is 2 mm or less. If the height of the reinforcing wall exceeds 2 mm, not only the heat exchanger tube can be made compact, but also the resistance of the passing air increases, and the heat exchange efficiency is deteriorated.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

In the following description, the word "aluminum" shall include an aluminum alloy in addition to pure aluminum. In addition, the same description and the same parts throughout the drawings with the same reference numerals will be omitted redundant description.

Fig. 22 shows a condenser in which a flat heat exchanger tube manufactured by the method of the present invention is used. The condenser is adjacent to a pair of headers 60 and 61 arranged at right and left sides at a distance from each other, a parallel flat heat exchanger tube 62 connected at both ends to two headers 60 and 61, respectively, Corrugated fins 63 arranged in the ventilation gap between the heat exchange tubes 62 and soldered to the two heat exchange tubes 62, an inlet tube 64 connected to the upper end of the left header 60, and a right header ( Lower than the middle of the outlet tube 65 connected to the lower end of the 61 and the left partition plate 66 provided inside at a position above the middle of the left header 60 and the right header 61. The number of heat exchange tubes 62 between the inlet pipe 64 and the left partition plate 62, the left partition plate 66, and the right partition plate provided with the right partition plate 67 installed inside at the position. The number of heat exchanger tubes 62 between the 67 and the number of heat exchanger tubes 62 between the right partition plate 67 and the outlet tube 65 are sequentially from the top. It is reduced, and is configured to flow in a meandering manner through the condenser until the refrigerant in the gas flowed from the inlet tube 64 flows out of the outlet tube 65 to the liquid phase.

First embodiment

This embodiment has a configuration as shown in Figs. As shown in Figs. 1 to 3, the flat heat exchanger tube A manufactured by the method of the present embodiment has flat upper and lower walls 1 and 2 with soldered fins, and left and right sides of the upper and lower walls 1 and 2, respectively. The vertical left and right side walls 3 and 4 spanning the edges and the upper and lower walls 2 in the region between the left and right side walls 3 and 4, and extend in the longitudinal direction at a predetermined distance from each other. A plurality of reinforcing walls 5 are provided, and parallel refrigerant passages 6 are formed therein. Between the adjacent reinforcement walls 5, the convex strip 7 for increasing the heat transfer area extending in the longitudinal direction on the lower surface of the upper wall 1 has a predetermined distance in the longitudinal direction on the upper surface of the lower wall 2. A plurality of heat transfer area increasing projections 8 are provided respectively. At the upper ends of the plurality of reinforcing walls 5, a plurality of trapezoidal communication holes 9 through which the parallel coolant passages 6 communicate with each other are zigzag-opened in plan view. The flat heat exchanger tube A is comprised from the 1st tubular structural member 10 made of aluminum, and the 2nd tubular structural member 11 made of aluminum.

Flat heat exchanger (A) is produced as follows. First, one roll is predetermined from the pressing plate which has a lead material layer on the lower surface of the first tubular structural member 10, and the pressing plate material having a lead material layer on the upper and lower surfaces of the second tube structural member 11. Using the upper and lower rolling rolls having a longitudinal cross-sectional shape, they are each roll formed into a predetermined cross-sectional shape shown in FIG. 4. The first tubular member 10 is formed between the flat bottom wall forming part 12, the rising wall 13 and the left and right rising wall 13 of the left and right side edges formed integrally by being raised from the bottom wall forming part 12. And a projection 8 for increasing heat transfer area between the reinforcing wall forming portion 14 and the adjacent reinforcing wall forming portion 14. An upper end of each reinforcing wall forming portion 14 is provided with a trapezoidal cutout 15 for forming a communication hole 9, and an outward inclined surface 16 is provided on the lower surface of the left and right side edges of the lower wall forming portion 12. Is formed. The height of the rising wall 13 and the reinforcement wall formation part 14 is comprised equally. The second tube member 11 corresponds to the flat upper wall forming portion 17, the vertical wall 18 of the left and right side edge portions which are raised downward from the upper wall forming portion 17 and integrally formed, and each reinforcing wall forming portion. And a heat transfer area increasing ridge 7 configured to be provided in a portion other than a portion corresponding to the soldering strength increasing ridge 19 and the reinforcing wall forming portion. The vertical wall 18 is formed so that its vertical length is slightly larger than the height of the rising wall 13. The width of the upper wall forming portion 17 is formed larger than the width of the lower wall forming portion 12 so that the two vertical walls 18 overlap the outside of the two rising walls 13. The ridge 10 for increasing the soldering strength and the ridge 7 for increasing the heat transfer area have the same shape in which the cross section of the tip is arcuate.

Next, after degreasing the two structural members 10 and 11, the soldering flux is applied to them, and as shown in FIG. 5, the second tubular structural member 11 is replaced by the first tubular structural member 10. Cover it with

The combination A1 consisting of two constituent members 10, 11 is passed through the temporary fixing device 20 shown in FIGS. 6 and 7. In this case, in order to allow the combination A1 to pass through the temporary fixing device 20, the front end of the combination A1 is slightly deformed to reduce its cross-sectional area. The temporary fixing device 20 consists of a pair of upper and lower pressure rolls 21 and a pair of width expansion prevention rolls 22. The upper and lower pair of pressing rolls 21 are freely rotated around an axis line extending in the left and right directions, and are arranged at intervals in the vertical direction. The pair of left and right width expansion prevention rolls 22 are freely rotated around an axis line extending in the vertical direction, and are arranged at intervals in the left and right directions. The axis of rotation of the two rolls 21, 22 is located in the same vertical plane. Each press roll 21 is provided with the circumferential surface 21a of the same length as the width of the flat heat exchanger tube A. As shown in FIG. The space | interval of the up-down direction between the upper and lower press rolls 21 is formed equal to the thickness of the flat heat exchanger tube A. FIG. Each widening prevention roll 22 has a circumferential surface 22a longer than the gap between the upper and lower pressing rolls 21, and the upper and lower portions of the circumferential surface 22a are respectively the upper and lower pressing rolls 21, respectively. It is arranged to almost contact the left and right end surfaces of the. The space | interval of the left-right direction between the left and right width expansion prevention rolls 22 is formed the same as the width | variety of the flat heat exchanger tube A. FIG. By such a configuration, the width is the same as the width of the flat heat exchanger tube A by the circumferential surface of the upper and lower pressure rolls 21 and the circumferential surfaces of the left and right width expansion prevention rolls 22, and the height thereof is the flat heat exchanger tube ( A space 23 equal to the thickness of A) is formed.

By passing the combination A1 between the upper and lower pressure rolls 21 of the temporary fixing device 20 and through the space 23 formed by the left and right width preventing rolls 22, the second pipe member 11 is formed. The lower ends of the two vertical walls 18 of the curved portion 18 are curved toward the inclined surface 16 which is raised outward of the lower wall forming portion 12 of the first tubular structural member 10, and adhered to the inclined surface 16. The whole of A1) is finished with a flat rectangular cross section, whereby the first tubular member 10 and the second tubular member 11 are temporarily fixed. In this case, the height positions of the upper edge portions of the portions 24 (see FIG. 4) between the adjacent cutouts 15 in the reinforcing wall forming portion 14 are different from those of the portions 24. Even if a gap is formed between the lower surface of the upper wall forming portion 17 of the second pipe constituting member 11, the upper edge of each portion 24 of the upper wall forming portion 17 has an inlet for increasing the soldering strength of the lower surface of the upper wall forming portion 17. In the part of l9, it is in close contact with the ridges 19. When the size of such a gap is smaller than the projecting height of the ridge 19, the ridge 19 is deformed to form the modified ridge 19 (see Fig. 8).

Next, the two structural members 10 and 11 temporarily fixed are heated to soldering temperature. In this way, the upper edges of the two rising walls 13 of the first tubular component 10 are soldered to the left and right side edges of the lower surface of the upper wall forming portion 17 of the second tubular structural member 11, The upper end of the reinforcing wall forming part 14 of the one pipe structural member 10 is soldered to the two ridges 19. As shown in FIG. 8, since the second tube member 11 is formed by rolling the pressing plate having the lead materials layers 25 and 26 on the upper and lower surfaces thereof, and forming the ridge 19 to be raised downward. The thickness of the lead material layer in the part of (19) becomes thicker than the thickness in other parts. As a result, it is easy to pull the molten lead material at the portion during soldering, so that the gap between the upper surface of the reinforcing wall forming portion 14 and the two ridges 19 is blocked, and after soldering, the lead material A modified ridge 19B is formed (see FIGS. 1 and 2). In addition, two vertical walls 18 of the second tube member 11 are soldered to the outside of the two rising walls 13 of the first tube member 10 and at the same time of the second tube member 11 The curved portions of the lower ends of the two vertical walls 18 are soldered as a seam that overlaps the inclined surface 16 of the first tubular structural member 10. In this way, the flat heat exchanger tube A is manufactured.

In this embodiment, each reinforcing wall forming portion 14 has a plurality of cutouts 15 at intervals in the longitudinal direction at its upper edge, and solders the two structural members 10 and 11 to the cutouts. A communication hole 9 is formed in the reinforcing wall 5 of the flat heat exchanger tube A so that the opening of the 15 is closed by the upper wall forming portion 17 so that the parallel refrigerant passages 6 can communicate with each other. The communication hole 9 may not be formed in the reinforcement wall 5. In this case, since the notch 15 is not provided in the reinforcing wall forming portion 14, when the two structural members 10 and 11 are temporarily fixed, the upper edge of the reinforcing wall forming portion 14 is its full length. It is in close contact with the ridge 19 for increasing the soldering strength of the lower surface of the upper wall forming portion 17.

In the present embodiment, two ridges 19 for increasing the soldering strength are provided in portions corresponding to the respective reinforcing wall forming portions, but at least one may be provided. However, as shown in Figs. 9 and 11, the cross sections of both corner portions 28 of the upper end of the reinforcing wall forming portion 27 and the tip portions of the ridge 29 are formed in an arc shape at the same time, and the ridge 29 is One pair is provided in a portion corresponding to each reinforcing wall forming portion, while the transverse inclined portion of the tip portion of each ridge 29 is one of the reinforcing wall forming portions when temporarily fixing the two structural members 10 and 11. Each ridge 29 is preferably positioned to abut the corner portion of the ridge. Since the mutual spacing L2 of the pair of ridges 29 in FIG. 11 is slightly larger than the mutual spacing Ll of the pair of ridges 29 in FIG. 9, the two constituent members 10, 11 are combined. In the above state, the distance l2 between the upper edge of the reinforcing wall forming portion 27 and the upper wall forming portion 17 in the former is the upper edge of the reinforcing wall forming portion 27 and the upper wall forming portion 17 in the latter. It becomes smaller than the space | interval (l1). In the case where the two structural members 10 and 11 are temporarily fixed in the state of applying force from above and below, the above-described spacings l1 and l2 are reduced so that the amount of upper end portions of the ridge 29 and the reinforcing wall forming portion 27 is reduced. Although the corners 28 are all deformed, the deformation modes are different because the intervals l1 and l2 are different, and accordingly, both corners of the upper ends of the ridge 29 and the reinforcement wall forming part 27 of FIG. 28 is a deformed ridge 29A as shown in FIG. 10 and both corner portions 28A of the upper end of the deformed reinforcement wall forming portion 27, and the ridge 29 and the reinforcing wall forming portion (Fig. Both corners 28 of the upper end of 27 are the modified ridges 29B as shown in FIG. 12 and both corners 28B of the upper end of the deformed reinforcement wall forming part 27, the pair of FIG. The contact area of the deformed ridge 29B and the deformed both corner portions 28B is larger than the contact area of the deformed ridge 29A of Fig. 10 and both corner portions 28A of the deformed upper end.

Second embodiment

This embodiment has a configuration as shown in Figs. As shown in Figs. 13 and 14, the flat heat exchanger tube B manufactured by the method of the present embodiment has a communication hole 9, a deformation ridge 19B, and heat transfer in the flat heat exchanger tube A of the first embodiment. The flat heat exchanger tube of the first embodiment, except that the area increasing ridge 7 is not provided and the gap between the reinforcing wall 5 and the upper wall 1 is completely filled with the fillet 30. It is the same as (A).

Although the flat heat exchanger tube B of this embodiment is comprised from the 1st tubular structural member 31 made of aluminum and the 2nd tubular structural member 32 made of aluminum, the 1st tubular structural member ( There is no ridges 19 and 7 provided on the lower surface of the cutout portion 15 provided in the reinforcing wall forming portion 14 and the upper wall forming portion 17 of the second pipe constituting member 11, As shown in FIG. 15, the entire lower surface of the upper wall forming portion 17 of the second tube member 32 is roughened using a wire brush or the like to form a flaw 33 in the oxide film formed on the surface. Except for the points, they are the same as the two structural members 10 and 11 in the first embodiment.

The process of temporarily fixing the first tubular structural member 31 and the second tubular structural member 32 and then brazing the two structural members to obtain the flat heat exchange tube B is the same as in the first embodiment. In the case of the second embodiment, when combined, the upper edge of the reinforcing wall forming portion 14 does not become horizontal, for example, is inclined from one end to the other end, so that the upper wall forming portion 17 of the second pipe member 32 is formed. Although the upper edge of the lower surface and the upper edge of the reinforcing wall forming portion 14 of the first pipe constituting member 3l are in contact only at one end and there is a slight gap in the other portion, the formed defect 33 of the lower surface of the upper wall forming portion 17 is formed. This part has no oxide film, so that the lead fluidity becomes good, and thus, the molten lead material first gathers at the contact portion between the upper wall forming portion 17 and the reinforcing wall forming portion 14, and then flows into the gap to enter the gap. Will be filled. Accordingly, the fillet 30 is formed between the upper wall forming portion 17 and the reinforcing wall forming portion 14 over the entire length of the reinforcing wall forming portion 14.

In the present embodiment, the lower surface of the upper wall forming portion 17 of the second pipe constituting member 32 is not provided with the ridge 19 for increasing the solder strength and the ridge 7 for increasing the heat transfer area as in the first embodiment. However, these may be provided, and it is preferable to form the flaw 33 in advance in the oxide film which formed on the surface by making the whole surface of the lower surface of the upper wall formation part 17 including these.

As shown in FIG. 16, in the method of the second embodiment, the first pipe-constituting member 34 having the same notch 15 as in the first embodiment in the rising wall 13 and the reinforcing wall forming portion 14. ) May be combined with the second pipe constituting member 32.

In the method of the second embodiment, as shown in FIG. 17, the reinforcing wall forming portion 14 is provided with the same cutout portion 15 as in the first embodiment, and the rising wall of the first pipe member 35 is provided. 36 is superposed on the outer side of the vertical wall 38 of the 2nd pipe structural member 37, and when it is temporarily fixed, the upper edge may be made into one surface with the upper surface of the upper wall formation part 17. As shown in FIG. There is no inclined surface upwardly outward on both the left and right side lower edges of the lower wall forming portion 2 of the first pipe member 35. In the resultant flat heat exchanger tube, the left and right side walls in which the rising wall 36 and the vertical wall 38 overlap in duplicate are formed.

As shown in FIG. 18, the height of the rising wall 40 of the first tubular member 39 is lower than that of the reinforcement wall forming portion 14, and the vertical wall 42 of the second tubular member 41 is formed. ) Is superimposed on the outer side of the rising wall 40, and when it is temporarily fixed, the lower edge portion may be one surface with the lower surface of the flat lower wall forming portion 2 of the first pipe constituting member 39. As a result, the left and right side walls of the resultant flat heat exchange tube become double walls only at the lower half.

As shown in FIG. 19, the rising wall 44 of the first tubular structural member 43 is formed to be about twice the thickness of the reinforcing wall forming portion 14, and the reinforcing wall forming portion is formed on the rising wall 44. An end portion 44a having the same height as the upper edge of 14 is provided, and in addition to this, a protrusion 45 having a thin thickness is provided on the upper side, and both left and right sides of the upper surface of the second pipe member 46 are provided. An inclined surface 47 downwardly may be formed. As a result, when the two structural members 43 and 46 are temporarily fixed, the upper thin projecting portion 45 is curved and overlapped with the inclined surface downwardly outward.

In the manufacturing method of the flat heat exchanger tube which concerns on this invention, even if there exists a part in which the clearance gap exists between the lower surface of the upper wall formation part of a 2nd piping constituent member, and the upper edge part of the reinforcement wall formation part of a 1st piping constituent member, Since such portions of the wall forming portion are soldered to the convex strips in contact with the ridges of the lower surface of the upper wall forming portion, no soldering failure occurs as a whole in the flat heat exchange tube.

In addition, by making the lower surface of the upper wall forming portion of the second pipe constituent member into a rough surface, a flaw is formed in advance on the oxide film formed on the surface, and the two constituent members are temporarily fixed after the two constituent members are temporarily fixed. The lead fluidity at the time of soldering becomes good, and the upper edge part of a reinforcement wall formation part does not become horizontal by this, for example, it inclines from the one end side to the other end part, and forms the upper wall of a 2nd pipe structural member when combining two structural members. Although the upper edge of the portion and the reinforcing wall forming portion of the first pipe constituting member contact only at one end portion of the combination and there is a slight gap in the other portion, the molten lead material firstly contacts the upper wall forming portion with the reinforcing wall forming portion. Gathered and then introduced into the gap to sequentially fill the gap. As a result, a fillet is formed between the reinforcing wall forming portion and the upper wall forming portion over the entire length of the reinforcing wall forming portion, so that no soldering failure occurs.

1 is a cross sectional view of a flat heat exchanger tube manufactured by the method of the first embodiment of the present invention;

FIG. 2 is a partially enlarged cross-sectional view of the flat heat exchanger tube of FIG. 1. FIG.

3 is an enlarged cross-sectional view taken along line 3-3 of FIG.

4 is a partial perspective view showing a state in which the first tube member and the second tube member are combined in the method of the first embodiment;

FIG. 5 is a cross-sectional view showing a state after combining the first tube member and the second tube member in FIG. 4. FIG.

6 is a front view of the entirety of the temporary fixing device with a portion cut away.

FIG. 7 is a partially enlarged cross-sectional view of the temporary fixing device of FIG. 6 showing the state in which the combination of the first tube member and the second tube member in FIG. 5 is temporarily fixed in detail; FIG.

FIG. 8 is a partial enlarged cross-sectional view of details of two structural members temporarily fixed in FIG. 6. FIG.

FIG. 9 shows an example in which a ridge for increasing the soldering strength of the upper wall forming portion of the second pipe forming member is arranged in a pair corresponding to the reinforcing wall forming portion and provided in pairs. Partial enlarged cross-sectional view in a state in which members are combined.

10 is an enlarged cross-sectional view after temporarily fixing the combination of FIG. 9;

FIG. 11 shows another example in which the ridges for increasing the soldering strength of the upper wall forming portion of the second pipe forming member are arranged in a pair corresponding to the portion corresponding to the reinforcing wall forming portion and provided in pairs. Partial enlarged cross-sectional view in a state in which the structural members are combined.

12 is an enlarged cross-sectional view after temporarily fixing the combination of FIG.

13 is a cross sectional view of a flat heat exchanger tube manufactured by the method of the second embodiment of the present invention;

14 is an enlarged sectional view taken along line 14-14 of FIG. 13;

Fig. 15 is a partial perspective view showing a state in which the first tubular member and the second tubular member are combined in the method of the second embodiment.

FIG. 16 shows a state in which the first pipe member having the same cutout as in the first embodiment is combined with the second pipe member by the rise wall and the reinforcement wall forming part in the method of the second embodiment; Partial perspective view.

FIG. 17 is a cross sectional view of a state in which two tubular members are combined using a first tubular member having a different rising wall and a second tubular member having a different vertical wall in the method of the second embodiment; FIG.

FIG. 18 is a cross sectional view of a state in which two tubular members are combined using a first tubular member having another different rising wall and a second tubular member having a different vertical wall in the method of the second embodiment; FIG.

19 is a cross sectional view of a state in which two tubular members are combined using a first tubular member having another different rising wall and a second tubular member without a vertical wall in the method of the second embodiment;

20 is a partially enlarged longitudinal sectional view showing a state in which a first pipe member and a second pipe member are temporarily fixed in a conventional method;

Fig. 21 is a partially enlarged longitudinal sectional view showing a state in which a first pipe member and a second pipe member having a cutout portion are temporarily fixed to a reinforcing wall in a conventional method;

22 is a front view of a condenser using a flat heat exchanger tube produced by the method of the present invention.

Claims (9)

It has a top and bottom wall, the left and right both sidewalls extending between the left and right side edges of the upper and lower walls, and a plurality of reinforcing walls extending between the upper and lower walls and extending in the longitudinal direction and spaced from each other, and parallel to the inside A method of manufacturing a flat heat exchanger tube in which a fluid passage of An upper wall composed of an aluminum first pipe constituting member including a plurality of reinforcing wall forming portions that are raised upwardly and integrally formed on the lower wall forming portion and the lower wall forming portion, and a pressing plate material having a lead material layer on at least a lower surface of the upper and lower surfaces. And a step of soldering and integrating the second tube constituting member made of aluminum including the forming portion, and extending in the longitudinal direction to a portion corresponding to each reinforcing wall forming portion in the lower surface of the upper wall forming portion of the second tube constituting member. A method of manufacturing a flat heat exchanger tube, characterized in that at least one or more ridges for increasing the soldering strength are formed in advance, and the two constituent members are soldered after temporarily fixing the two constituent members in a state of applying force from above and below. The cross section of both corner portions of the upper end of the reinforcing wall forming portion and the tip portion of the ridge is formed in an arc shape, and a pair of ridges are provided at a portion corresponding to each of the reinforcing wall forming portions. A method of manufacturing a flat heat exchanger tube, characterized in that each ridge is positioned so that the transverse inclined portion of the tip portion of each ridge abuts one corner portion of the reinforcing wall forming portion when temporarily fixing the member. The method for manufacturing a flat heat exchanger tube according to claim 1, wherein a ridge for increasing heat transfer area is formed in advance in a portion other than a portion corresponding to the reinforcing wall forming portion at the lower surface of the upper wall forming portion of the second pipe constituting member. The flaw is formed in advance in the oxide film which formed on the surface by making the lower surface of the upper wall formation part of a 2nd tubular structural member into rough surface before temporarily fixing two structural members. The manufacturing method of the flat heat exchanger tube made into. 2. The reinforcing wall forming portion according to claim 1, wherein each of the reinforcing wall forming portions has a plurality of cutout portions at intervals in the longitudinal direction at upper edge portions thereof, and the two constituent members are soldered to close the open portions of the cutout portions by the upper wall forming portions in parallel. A method of manufacturing a flat heat exchanger tube, characterized in that a communication hole is formed in the reinforcing wall to allow the fluid passage of the die to pass through. According to claim 1, wherein the rising wall of the same height as the reinforcing wall is raised to the left and right side edges of the lower wall forming portion of the first pipe constituting member integrally formed, the inclined surface upwardly outward on the lower surface of the left and right side edges. And vertically forming vertical walls overlapping the outer side of the rising wall whose vertical length is greater than the height of the rising wall and integrally formed on both left and right side edges of the upper wall forming portion of the second pipe forming member. 2. A method of manufacturing a flat heat exchanger tube, characterized in that the lower end portions of two vertical walls are curved on an inclined surface that is upwardly outward when the tube member is temporarily fixed so as to be one surface with the lower wall forming portion. It has a top and bottom wall, the left and right both sidewalls extending between the left and right side edges of the upper and lower walls, and a plurality of reinforcing walls extending between the upper and lower walls and extending in the longitudinal direction and spaced from each other, and parallel to the inside A method of manufacturing a flat heat exchanger tube in which a fluid passage of An upper wall composed of an aluminum first pipe constituting member including a plurality of reinforcing wall forming portions that are raised upwardly and integrally formed on the lower wall forming portion and the lower wall forming portion, and a pressing plate material having a lead material layer on at least a lower surface of the upper and lower surfaces. And a step of soldering and integrating the second tube constituent member made of aluminum including the forming portion, and forming a flaw in advance on the oxide film formed on the surface by making the lower surface of the upper wall forming portion of the second tube constituent member rough. A method for manufacturing a flat heat exchanger tube, wherein the two constituent members are soldered after temporarily fixing the two constituent members. 8. The reinforcing wall forming portion according to claim 7, wherein each of the reinforcing wall forming portions has a plurality of cutouts at intervals in the longitudinal direction at their upper edges, and the two constituent members are brazed to close the openings of the cutouts by the upper wall forming portion in parallel. A method of manufacturing a flat heat exchanger tube, characterized in that a communication hole is formed in the reinforcing wall to allow the fluid passage of the die to pass through. 8. The inclined surface of claim 7, wherein the rising wall having the same height as the reinforcement wall is integrally formed by raising the rising walls having the same height as the reinforcing wall at the left and right side edges of the lower wall forming member of the first pipe constituting member. And vertically forming vertical walls overlapping the outer side of the rising wall whose vertical length is greater than the height of the rising wall and integrally formed on both left and right side edges of the upper wall forming portion of the second pipe forming member. 2. A method of manufacturing a flat heat exchanger tube, characterized in that the lower end portions of two vertical walls are curved on an inclined surface that is upwardly outward when the tube member is temporarily fixed so as to be one surface with the lower wall forming portion.

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