JP3766030B2 - Heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger provided in, for example, an air conditioner. Specifically, the heat exchanger includes a heat exchange pipe that conducts a refrigerant, which is a heat exchange fluid, and a fin joined to the heat exchange pipe. The present invention relates to a heat exchanger for more efficiently performing a heat exchange action between air in an air-conditioned room and a refrigerant.
[0002]
[Prior art]
FIG. 25 is an exploded perspective view showing a conventional heat exchanger disclosed in, for example, Japanese Patent Laid-Open No. 6-307785. In FIG. 25, F is a plurality of aluminum fins having a brazing sheet, P is a heat exchange pipe inserted and fixed in an insertion recess F1 formed in the aluminum fin F, and F2 is a plurality of sheets from the heat exchange pipe P. A fin collar P <b> 1 for positioning the distance between the aluminum fins F is a refrigerant conduction channel chamber provided in the heat exchange pipe P.
[0003]
In the heat exchanger as described above, the heat of the refrigerant passing through the flow path chamber P1 is transmitted from the heat exchange pipe P to the plurality of aluminum fins F, and then transmitted to the air flowing between the aluminum fins F. Thereby, heat exchange between the refrigerant and the air is performed.
[0004]
In addition, the plurality of aluminum fins F and the heat exchange pipes P are joined together in a flat heat exchange pipe P in a slit-like insertion recess F1 formed in a cutout at one side edge of each aluminum fin F. Is inserted and placed in a furnace and heated in a batch.
[0005]
At this time, the brazing filler metal existing on the surface of each aluminum fin F is melted by being heated in the furnace, and flows between each heat exchange pipe P and the fin collar F2 to join them together.
[0006]
[Problems to be solved by the invention]
However, in the conventional heat exchanger, in a state before brazing, the heat exchange pipe P and the fin collar F2 are not in full contact with each other, and a gap of about 0.3 mm is formed in part. It has become. The brazing material flowing out of the brazing sheet by heating flows into the minimum gap between the heat exchange pipe P and the fin collar F2 due to its surface tension and solidifies. The braze solidified in this minimum gap part is joined only in the region of about 1/50 to 1/10 with respect to the height of the fin collar F2, and the heat exchange pipe P and the brazing are laminated on the surface of the aluminum fin F. The area where the aluminum fins F are joined is extremely narrow. For this reason, the contact thermal resistance between the heat exchange pipe P and the aluminum fins F is increased, the heat transfer rate is lowered, and sufficient heat exchange efficiency cannot be obtained.
[0007]
Moreover, since the aluminum fin F using a brazing sheet is used, when brazing, the brazing on the surface of the aluminum fin that comes into contact with air locally condenses, and the contact surface with air becomes rough. Therefore, the frictional resistance increases with respect to the air flowing between the aluminum fins F, and a problem that good characteristics as a heat exchanger cannot be obtained has occurred. Furthermore, when the aluminum fins F are inserted into the heat exchange pipe P, the heat exchange pipe P and the aluminum fins F are partially in contact with each other, so the frictional resistance at the time of insertion is large, and heat exchange is performed without bending the aluminum fins F. It was very difficult to arrange in the pipe P.
[0008]
The present invention has been made in view of the above, has a good heat transfer coefficient between the heat exchange pipe and the fins, can reduce the frictional resistance of the air flowing between the fins, and is excellent in assemblability. The purpose is to obtain a heat exchanger.
[0009]
[Means for Solving the Problems]
  In order to achieve the above object, a heat exchanger according to the present invention is inserted into a metal heat exchange pipe for conducting a refrigerant, a fitting insertion part for fitting the heat exchange pipe, and the fitting insertion part. A fin formed by a metal plate-like member projecting a metal fin collar having a curved surface portion facing the peripheral surface of the heat exchange pipe, and the fin collar and the heat exchange pipe inserted therethrough In the heat exchanger formed by bonding between the heat exchange pipe and the fin collar, the wax used for joining the heat exchange pipe and the fin collar is unevenly distributed by partially contacting or joining the outer surface of the heat exchange pipe, By heating and melting the solder that is in contact with or joined to the heat exchange pipe in a state where the fin collar and the heat exchange pipe are fitted and inserted into the gap between the heat exchange pipe and the fin collar. Was flowed filled, and bonding the heat exchange pipe and the fin collar by the filled wax,The insertion portion formed in the fin is formed by a slit-like insertion recess formed so as to open at an end edge located on the downstream side of the airflow flowing along the fin, and the heat exchange pipe Is inserted inward from the opening of the recess for insertion, and the wax is unevenly distributed at the downstream end of the air flow of the heat exchange pipe, and is melted between the fin collar on the upstream side and the heat exchange pipe. Fill the gap and join the fin collar and heat exchange pipeIt is characterized by that.
[0010]
  In the present invention,A metal fin having a metal heat exchange pipe for conducting the refrigerant, a fitting insertion portion for fitting the heat exchange pipe, and a curved portion facing the peripheral surface of the heat exchange pipe fitted in the fitting insertion portion A heat exchanger comprising: a fin formed by a metal plate-like member projecting a collar; and a heat exchanger pipe formed by joining the fin collar and a heat exchange pipe inserted through the fin collar, The wax used for joining the exchange pipe and the fin collar is unevenly distributed by partially contacting or joining the outer surface of the heat exchange pipe.,With the fin collar and the heat exchange pipe fitted, the wax brought into contact with or joined to the heat exchange pipe is heated and melted so that the wax flows into the gap between the heat exchange pipe and the fin collar. The heat exchange pipe and the fin collar are joined by the filled wax, and the heat exchange pipe is composed of a plurality of flat tubes inserted into the same insertion portion in the fin, and the wax is adjacent to The flat collar is unevenly distributed on the outer surface by contacting or joining the plurality of flat tubes, and a notch is formed at the center of the fin collar.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments of a heat exchanger according to the present invention will be explained below in detail with reference to the accompanying drawings.
[0026]
Embodiment 1 FIG.
FIG. 1 is a diagram for explaining a first example of a heat exchanger according to a first embodiment for carrying out the present invention, in which (a) shows a state in which a heat exchange pipe is fitted into an aluminum fin. The perspective view which shows the state before performing brazing, (b) is heating from the state shown to (a), and melt | dissolves the wax unevenly distributed in the heat exchange pipe, and brazes the heat exchange pipe and the aluminum fin. The perspective view which shows the attached state, (c) is a partially longitudinal front view which shows an aluminum fin. FIG. 2 is a longitudinal side view showing the relationship between the heat exchange pipe and the fin of the heat exchanger, and (a) is a state where the heat exchange pipe and the fin are brazed in the first embodiment of the present invention. (B) shows a state using a conventional fin with a uniform brazing on the surface, and (c) shows a brazing state when using a conventional fin or a heat exchange pipe with a uniform brazing Is shown.
[0027]
In FIG. 1, reference numeral 1 denotes a heat exchange pipe for conducting a refrigerant which is a heat exchange fluid, and has a cylindrical shape. Reference numeral 2 denotes a brazing material attached in a state of being unevenly distributed at one place of the heat exchange pipe before brazing. In this embodiment, a protrusion shape extending along a direction parallel to the central axis of the heat exchange pipe 1 I am doing. Reference numeral 3 denotes a plurality of fins attached to the heat exchange pipe 1, and the fin 3 is provided with an insertion hole 4 and a fin collar 5 into which the heat exchange pipe 1 is inserted.
[0028]
The insertion hole 4 and the fin collar 5 are formed in dimensions and shapes so that the heat exchange pipe 1 provided with the wax 2 can be inserted smoothly. That is, in the insertion hole 4 and the fin collar 5, circumferential portions 4 a and 5 a that can smoothly insert the outer peripheral portion of the heat exchange pipe 1, and concave portions 4 b and 5 b that can smoothly insert the protrusions. Is formed.
[0029]
The fin collar 5 is provided for the purpose of ensuring a wide contact area between the fins 3 and the heat exchange pipe 1, but also functions as a spacer for determining the distance between the upper and lower fins 3. ing. In order to ensure the function as the spacer, this kind of fin collar 5 generally has a tapered shape in which the opening diameter of the circumferential portion 5a increases toward the outer end portion (FIG. 2). Thus, the outer end portion of the fin collar 5 can be surely brought into contact with one surface of the adjacent fin 3 (see (a)). That is, it is possible to avoid the inconvenience that the outer end portion of the fin collar 5 is fitted into the fitting insertion hole 4 of the adjacent fin.
[0030]
When fixing the plurality of fins 3 having the above-described configuration to the heat exchange pipe 1, the heat exchange pipe 1 to which the wax 2 is attached is connected to the fin collars 5 of the plurality of fins 3 and the insertion holes (insertion portions). ) 4 are sequentially inserted, and with the plurality of heat exchange pipes 1 and the plurality of fins 3 assembled, the assembled heat exchanger is placed in a furnace and heated. Then, the wax 2 that is unevenly distributed in a part of the heat exchange pipe 1 is melted and flows between the circumferential portion 5a of the fin collar 5 and the heat exchange pipe 1 due to surface tension. The heat exchange pipe 1 and each fin 3 are firmly joined.
[0031]
As described above, in the first embodiment, unlike the conventional case where the wax is arranged with a uniform thickness on the outer peripheral surface of the heat exchange pipe 1 or the brazing sheet, the wax is placed at one place on the peripheral surface of the heat exchange pipe 1. 2 is unevenly distributed. Accordingly, by appropriately setting the length, width, thickness and the like of the wax 2, the amount of wax required to completely fill the gap between the circumferential portion 5a of the fin collar 5 and the heat exchange pipe 1 is obtained. And the heat exchange pipe 1 and the fin collar 5 can be firmly fixed. This can correspond to the case where the fin collar 5 has a tapered shape as described above and a relatively large space is formed between the outer end portion and the heat exchange pipe 1.
[0032]
However, when the wax 2 is melted, a gap g as shown in FIG. 1B is formed between the recess 5b of the fin collar 5 and the heat exchange pipe 1, and this is formed between the fin collar 5 and the heat exchange pipe. It becomes a non-joining part formed between 1 and 1. However, since the area of the non-joined portion is slightly smaller than the area of the other joined portion (circumferential portion 5a), the overall joint area between the fin collar 5 and the heat exchange pipe 1 is smaller than that of the conventional case. The heat conductivity from the heat exchange pipe 1 to the fins 3 is greatly improved.
[0033]
On the other hand, when the wax is uniformly arranged on the surface of the heat exchange pipe P or the surface of the aluminum fin F as in the conventional heat exchanger, the wax on the surface melts and the heat exchange pipe P and The aluminum fin F will be joined, but since there is a small amount of solder applied to this surface, the space between the aluminum fin F and the heat exchange pipe P cannot be sufficiently filled, and the heat exchange pipe Between P and the aluminum fin F, a non-joint part is formed over a considerably wide range, and there is a disadvantage that a good heat exchange rate cannot be obtained.
[0034]
That is, in order to enable the heat exchange pipe 1 to be smoothly inserted into the fins 3 as in the first embodiment, the gap d (see FIG. 2 (a) between the aluminum fins 1 and the heat exchange pipes 3 is used. In addition, when the fin collar 5 having a tapered shape as described above is used, a large gap is formed between the vicinity of the end of the fin collar 5 and the heat exchange pipe. . Moreover, the melt | dissolved wax will be attracted | sucked from the smaller clearance gap in the clearance gap formed between a fin collar and a heat exchange pipe with the surface tension.
[0035]
Therefore, in the case of a small amount of wax that is uniformly arranged on the fin collar F or the heat exchange pipe P or the like according to the conventional method as shown in FIG. 2B, as shown in FIG. Since the wax is not supplied to a part of the base of F, and the non-joined part is formed over a wide range, the heat transfer rate from the heat exchange pipe to the fin is lowered, and good heat exchange efficiency is obtained. Inconvenience that it is not possible. In order to avoid such an inconvenience, it is conceivable to set the gap d narrow. However, in that case, it becomes difficult to insert the heat exchange pipe into the fin, which causes a problem that the production efficiency is lowered.
[0036]
In the heat exchanger according to the first embodiment, when the heat exchange pipe 1 is inserted into the fin 3, the wax 2 is unevenly distributed at a position not facing the peripheral surface portion 5a of the fin collar 5, that is, a position passing through the recess 5b. Therefore, a sufficient amount of wax can be supplied to fill the gap d, and good heat exchange efficiency can be obtained. Moreover, since sufficient wax can be supplied to fill the gap d, the gap d can be widened, and the heat exchange pipe 1 can be smoothly inserted into the fins 3. For this reason, the assembly operation of the heat exchange pipe 1 and the fins 3 is facilitated, the productivity is improved, and an inexpensive heat exchanger can be provided.
[0037]
Further, as shown in FIG. 3, the position of the wax 2 that is unevenly distributed in the heat exchange pipe 1 (the position of the recess 5 b of the fin collar 5) is on the downstream side with respect to the air flow formed between the fins 3. Preferably there is.
[0038]
This is because the heat transfer coefficient between the air and the fin 3 is different between the upstream side and the downstream side. That is, since the boundary layer of air is thin on the upstream side of the airflow, the heat transfer coefficient between the fins 3 is good, but the airflow hardly flows on the downstream side, so that heat transfer between the air and the fins 3 is performed. The rate is low. In addition, after brazing, the brazing 2 flows out between the heat exchange pipe 1 and the recess 5b of the fin collar 5 to form a gap g, so that the heat transfer coefficient of this part is lower than that of the other parts. Become.
[0039]
Therefore, if the unevenly distributed position of the wax 2 (position of the recess 5b) is positioned on the downstream side, the portion with improved heat transfer coefficient (circumferential portion 5a) is positioned on the upstream side with high heat exchange efficiency. Since the gap g is located on the downstream side where the transfer rate is low, the heat transfer rate on the upstream side can be greatly improved while suppressing the adverse effect due to the presence of the gap g. For this reason, a heat transfer rate can be raised as the whole heat exchanger. As shown in FIG. 3, the position where the wax 2 is unevenly distributed is effectively 0 to 120 °, and the most preferable angle is 0 to 30 ° on the downstream side.
[0040]
Moreover, in this Embodiment 1, like the conventional method using a brazing sheet, the surface of the fin is not roughened after brazing, and the contact resistance with the airflow is not increased.
[0041]
In addition, attaching the solder | pewter 2 which makes the above-mentioned protrusion shape to the heat exchange pipe 1 is extruding along a brazing material along the side surface of a heat exchange pipe, for example, when producing a heat exchange pipe by extrusion processing. It can be realized by processing.
[0042]
Further, in Embodiment 1 described above, the wax that is unevenly distributed in the heat exchange pipe has been described. However, the heat exchange pipe and the brazing material may be formed separately, and then may be brought into contact with each other. In addition, the same effect as in the first embodiment can be obtained.
[0043]
FIG. 4 shows a state in which the heat exchange pipe and the brazing material 2 are separately formed as described above, and then assembled by bringing the brazing material into contact with the heat exchange pipe on the downstream side of the air flow of the heat exchange pipe. It is a top view which shows the state which brazed with the brazing material. In FIG. 4, the same or corresponding parts as those in FIGS. 1 and 2 are denoted by the same reference numerals.
[0044]
Thus, even if the heat exchange pipe 1 and the brazing material 2 are separately incorporated, if they are in contact with each other, the braze 2 flows around and the heat exchange pipe 1 and the fin 3 are circles of the fin collar 5. Since it is completely joined at the peripheral portion 5a, the joining area can be increased, and the heat transfer coefficient between the heat exchange pipe 1 and the fin 3 can be increased similarly to that shown in FIG. The heat transfer coefficient of the entire exchanger can be improved.
[0045]
In the first embodiment, the case where one wax continuous to one angular position on the peripheral surface of the heat exchange pipe 1 is unevenly distributed or brought into contact is described as an example, but the same angular position is used. A plurality of waxes may be formed intermittently, and may be unevenly distributed or contacted at several different angular positions. In this case, the same effect can be obtained. However, when unevenly distributed at a plurality of angular positions, it is necessary to form a plurality of recesses 5b in the fin collar 5 correspondingly.
[0046]
Embodiment 2. FIG.
FIG. 5 is a perspective view for explaining a heat exchanger according to a second embodiment for carrying out the present invention. FIG. 5 (a) is a state in which the heat exchange pipe is inserted into the aluminum fin and brazed. (B) shows a state where heating is performed from the state shown in (a), the wax unevenly distributed in the heat exchange pipe is dissolved, and the heat exchange pipe and the aluminum fin are brazed. (C) is a partially longitudinal front view showing an aluminum fin.
[0047]
In the second embodiment, the heat exchange pipe is constituted by a flat tube 21, and a wax 22 is fixed to the outer surface of the flat tube 21, so that the heat exchange pipe is formed in a streamlined shape that is symmetrical in the longitudinal direction as a whole. Further, the fin 23 is formed with a fitting insertion hole 24 and a fin collar 25 having a dimensional shape so that the flat tube 21 and the braze 22 can be smoothly inserted. Further, the position of the unevenly distributed wax is preferably located on the downstream side of the airflow, as in the first embodiment described above, and it is most preferable to distribute the wax unevenly at the rear edge of the flat tube 21. Reference numeral 21a denotes a plurality of flow passage chambers divided and formed in the flat tube 21.
[0048]
Also in the second embodiment, when the heat exchange pipe 21 and the fin 23 are joined, the heat exchange pipe 21 in which the wax 22 is unevenly distributed is inserted into the fitting insertion hole 24 and the fin collar 25 of the fin 23. Assemble and heat it in a furnace. At this time, the unevenly distributed wax 22 flows between the heat exchange pipe 21 and the fin collar 25, and as a result, a gap g is formed between the fin collar 25 and the heat exchange pipe 21.
[0049]
However, since a sufficient amount of the wax 22 that is unevenly distributed is supplied to the other portions, the space between the fins 23 and the heat exchange pipe 21 is almost completely filled except for the gap g. Thereby, the fin 23 and the heat exchange pipe are firmly joined. In the gap g, the heat transfer coefficient from the heat exchange pipe to the fins deteriorates, but by filling the other part more sufficiently than the part in the gap g, the heat seen from the whole heat exchanger The heat transfer coefficient between the exchange pipe and the fin is better than before. Moreover, if the wax 22 is unevenly distributed at the rear edge portion of the flat tube 21 and the gap g formed after brazing is arranged on the downstream side of the airflow as in the first embodiment described above, the gap Most adverse effects due to the presence of g can be avoided.
[0050]
Furthermore, in the heat exchanger in the second embodiment, since the flat tube 21 is used, when arranging a plurality of heat exchange pipes 21 along one direction as shown in FIG. The contact area with the fins 23 can be increased as compared with the case where the circular heat exchange pipe 21 is used. Further, since the flat tube 21 has a streamline shape, the air resistance can be reduced as compared with the circular heat exchange pipe 21, and better characteristics as a heat exchanger can be obtained.
[0051]
Also in the second embodiment, the brazing material 22 is formed separately from the flat tube 21 and is assembled by bringing it into contact with the flat tube 21 and brazed in the furnace. 1 can be obtained. In this case as well, it is desirable to dispose and braze a brazing material downstream of the airflow.
[0052]
Embodiment 3
FIG. 6: is a front view for demonstrating the 1st example of the heat exchanger concerning Embodiment 3 for implementing this invention, (a) is the state which inserted the heat exchange pipe in the aluminum fin. The state before brazing is shown, and (b) is heated from the state shown in (a), and the wax unevenly distributed in the heat exchange pipe is melted to braze the heat exchange pipe and the aluminum fin. Indicates the state.
[0053]
In this example, a plurality of (in this case, two) flat tubes 31 are integrally joined by brazing 32 that is unevenly distributed between the flat tubes 31 to form a heat exchange pipe, and the plurality of integrated flat tubes 32 is inserted and assembled in a flat fin collar 35 of an aluminum fin 33, and brazed by heating it in a furnace. In this case, the melted braze 32 flows into the gap between the flat tube 31 and the fin collar 35, joins the flat tube 31 and the fin collar 35, and between the flat tubes 31 is shown in FIG. Thus, the gap g is formed.
[0054]
Although the heat exchange rate with the air of the flat tube 31 located on the downstream side of the airflow is slightly reduced due to the presence of the gap g, each flat tube 31 and the fin collar 35 are joined by a sufficient amount of brazing 32. Therefore, a large joining area can be ensured as a whole, and the heat transfer coefficient between each flat tube 31 and the fin collar 35 is greatly improved. As a result, since the heat exchange rate between the upstream flat tube 31 and the air is remarkably improved, even if the heat exchange rate slightly decreases in the downstream flat tube 31, it can be sufficiently compensated for, The heat exchange rate of the entire heat exchanger is improved. Further, since the amount of the brazing 32 can be set sufficiently, when the flat tube 31 is inserted into the aluminum fin 33, the difference between the inner surface dimension of the fin collar 35 and the outer surface dimension of the flat tube 31 can be increased. Becomes easy.
[0055]
FIG. 7 is a diagram showing a second example in the third embodiment. In the second example, a plurality of flat tubes 31 (here, similar to the flat tubes 31 shown in FIG. 6) are shown. In this case, the flat tube 31 is inserted into the aluminum fin 33 in a slit-like recess for insertion (insertion portion) that opens at the side end portion. A plurality of sets (two sets in this case) of fin collars 35a and 35b facing the flat tubes 31 are formed on the periphery of the recess 34 for insertion. The fin collar 35 a located on the upstream side of the airflow has a U-shape facing the upper and lower surfaces of the flat tube 31 and the upper end of the airflow side, and the fin collar 35 b located on the downstream side of the flat tube 31 It has two flat plate shapes that cover only the upper and lower surfaces.
[0056]
Even in the second example, similarly to the first example, each of the flat tubes 31 and the fin collars 35a facing each flat tube 31 are provided by a sufficient amount of wax 32 interposed between the flat tubes 31. The gap with 35b can be filled, and good heat exchange efficiency can be obtained.
[0057]
In the first and second examples of the third embodiment, as illustrated in FIGS. 6 and 7, a case where a plurality of flat tubes are joined by brazing 32 and integrated is described as an example. However, as shown in the third example of FIG. 8, between the separated flat tubes 31, a separate brazing material 32 may be inserted so as to be in contact with the flat tubes 31 and the fin collars 35. In this case as well, the same effect as in the first and second examples can be obtained.
[0058]
Embodiment 4 FIG.
FIG. 9: is a perspective view for demonstrating the 1st example of the heat exchanger concerning Embodiment 4 for implementing this invention.
[0059]
In the fourth embodiment, a flat tube 41 is provided as a heat exchange pipe, and the wax 42 is unevenly distributed on the outer surface of the rear end portion of the flat tube 41. On the other hand, the aluminum fin 43 has a slit shape that opens at one side edge thereof. Are formed, and a fin collar 45 having substantially the same shape as that of the fitting recess 44 is provided in a projecting manner.
[0060]
And the joining of the aluminum fin 43 and the flat tube 41 is performed by inserting and assembling the flat tube 41 into the recesses 44 for insertion of the plurality of aluminum fins 43, and heating it in the furnace, thereby A wax 42 is poured between the aluminum fins 43 and the fin collar 45, and the plurality of aluminum fins and the flat tube 41 are joined together. As a result, also in this fourth embodiment, good heat exchange efficiency can be obtained as in the second embodiment.
[0061]
Furthermore, in this Embodiment 4, the flat tube 41 and the aluminum fin 43 are assembled by inserting the heat exchange pipe 41 from the opening part formed in the one side edge part of the aluminum fin 43. FIG. Therefore, the amount of relative movement between the heat exchange pipe 41 and the aluminum fins 43 is small compared to the case where the heat exchange pipe 21 is inserted into the annular hole as in the insertion hole 24 in the second embodiment. And easy to assemble.
[0062]
However, if the gap between the fin collar 45 and the flat tube 41 is small, the heat exchange pipe 41 becomes difficult to be inserted and the fin may be bent by contact with the aluminum fin 43. It is necessary to increase the distance by 0.1 mm or more. Therefore, when brazing is performed using a small amount of brazing material uniformly applied to the surfaces of the heat exchange pipe and the fin, the joint area between the fin collar and the heat exchange pipe becomes very small. On the other hand, in the fourth embodiment, a large amount of wax 42 that is unevenly distributed on the downstream side of the flow flows into the gap between the fin collar 45 and the flat tube 41, and the aluminum fin 43 and the flat surface are sufficiently filled. The thermal conductivity with the tube 41 can be sufficiently increased, and a good heat exchange rate can be obtained.
[0063]
A second example in the fourth embodiment is shown in FIG. In the second example shown in FIG. 10, a plurality of heat exchange pipes having unevenly distributed wax 42 are inserted into the insertion recess 44. In this case, the unevenly distributed wax 42 is not arranged at least in the most upstream in the recess 44 for insertion.
[0064]
FIG. 11 shows a third example in the fourth embodiment. In this third example, a plurality (two in this case) of flat tubes are joined together by a braze 42 and integrated, and the plurality of flat tubes 41 and the braze 42 are shown in FIGS. 8 and 9. It arrange | positions in the recessed part (insertion part) 44 for insertion of the aluminum fin 43 which makes the structure similar to the 1st and 2nd example.
[0065]
According to this, it is possible to obtain a good heat exchange rate as in the second example, and it is easy to attach the wax 42 to the plurality of flat tubes 41, and into the recess 44 for insertion. The arrangement of the plurality of flat tubes 41 is also facilitated, and the effect that the manufacturing process of the heat exchanger is simplified is also obtained.
[0066]
In the first to third examples, the case where the flat tube 41 and the wax 42 are integrally formed has been described as an example. However, as shown in the fourth example of FIG. The brazing material 42 may be configured separately, and the separate brazing material 42 may be inserted in contact with the flat tubes 41 and the fin collars 45. In this case as well, the first to third examples The same effect can be obtained.
[0067]
Embodiment 5. FIG.
FIG. 13: is a front view for demonstrating the 1st example of the heat exchanger concerning Embodiment 5 for implementing this invention, (a) is the state which inserted the heat exchange pipe in the aluminum fin. The state before brazing is shown, and (b) is heated from the state shown in (a), and the wax unevenly distributed in the heat exchange pipe is melted to join the heat exchange pipe and the aluminum fin. The attached state is shown.
[0068]
In this first example, a plurality (two in this case) of flat tubes 51 are used as heat exchange pipes, and the flat tubes 51 are joined and integrated with each other by a brazing 52, and the integrated plural The flat tube 51 and the wax 52 are inserted into the insertion holes (insertion portions) 54 of the aluminum fins 53 and the fin collar 55, and notches 55 a and 55 b are formed in the intermediate portion of the fin collar 55. Is formed.
[0069]
And joining of the aluminum fin 53 and the flat tube 51 inserts and assembles the flat tube 51 in the insertion hole 54 of the several aluminum fin 53, and heats it in a furnace, Each flat tube 51 Then, the solder 52 is poured between the fin collar 55 and the fin collar 55 to join them. As a result, also in the first example of the fifth embodiment, good heat exchange efficiency can be obtained as in the second embodiment.
[0070]
In the first example, when the brazing between the flat tube 51 and the fin collar 55 is completed, a gap g is formed between the flat tubes 51 as shown in FIG. And the notches 55a and 55b form a drainage hole d that communicates in the vertical direction on the paper surface. The drainage hole d enhances the drainage of water adhering to the heat exchanger.
[0071]
That is, when air is cooled by the heat exchanger, moisture contained in the air is condensed and adheres to the heat exchanger. The moisture generated in the heat exchanger generally flows down along the fins. However, in the heat exchange pipe using a flat tube, water accumulates at the center of the pipe, and there is a problem that water drops are sucked into the fan by riding on the air current.
[0072]
On the other hand, in the first example, the condensed water can be drained by flowing down from the central drain hole d, and water drops are not sucked into the fan. As described above, according to this example, the drainage hole d can be formed at the same time as the brazing 52 joins the flat tube 51, so that not only the performance as a heat exchanger can be improved, but also the problem of using the flat tube is simultaneously generated. Can be resolved.
[0073]
FIG. 14 shows a second example of the fifth embodiment of the present invention. In the second example, a slit-like insertion recess (insertion portion) 54 opened at one side edge portion is formed on the aluminum fin 53, and the fin collar is substantially the same shape as the insertion recess 54. 55 is provided so that notches 55a and 55b are formed in the fin collar 55. Further, as the heat exchange pipe, a plurality (two in this case) of flat tubes 51 formed by joining the front and rear end portions with brazing 52 as in the first example are used.
[0074]
Even in the second example, the drainage hole d as shown in FIG. 14B is formed by joining the fin collar 55 formed with the notches 55a and 55b and the flat tubes 51. Therefore, the drainage in the heat exchanger can be enhanced as in the first example, and the problem of using the flat tube 51 can be eliminated.
[0075]
Further, since the heat exchange pipe 51 is inserted and assembled from the opening formed at one side edge of the aluminum fin 53, the relative movement amount between the heat exchange pipe 51 and the aluminum fin 53 is small. This also has the effect of facilitating assembly work.
[0076]
FIG. 15 is a diagram showing a third example in the fifth embodiment of the present invention. In the third example, a slit-like insertion recess (insertion portion) 54 that opens at one side edge of the aluminum fin 53 is formed, and a fin collar 55 is formed along the insertion recess 54. Is a projecting project. However, the end of the fin collar 55 in this example is omitted so as to be shorter than the recess 54 for insertion, and a drainage hole d communicating vertically is formed by the notches 55a and 55b. ing.
[0077]
According to the third example, moisture attached to the heat exchanger can be discharged through the drainage holes d formed at the end portions of the fin collar 55, and good drainage can be obtained. 51 can be inserted from the opening formed in the side edge part of the aluminum fin 53, and an assembly operation becomes easy.
[0078]
In the third example, the case where the single flat tube 51 is disposed in the recess 54 for insertion of the aluminum fin 53 has been described as an example. However, in the fourth example shown in FIG. As described above, a plurality of flat tubes 51 can be inserted into the recesses 54 for insertion and the fin collar 55.
[0079]
Further, in the first to fourth examples in the fifth embodiment, the case where the flat tube 51 and the wax 52 are integrally formed has been described as an example. However, the fifth example of FIG. As described above, the flat tube 51 and the brazing material 52 may be configured separately, and the separate brazing material 52 may be inserted so as to contact the flat tube 51 and the fin collar 55. The same effects as those of the first to fourth examples can be obtained.
[0080]
Embodiment 6 FIG.
18 to 24 are views showing Embodiment 6 for carrying out the present invention.
[0081]
In the heat exchanger shown in the first to fifth embodiments, the sixth embodiment includes the flux 60 in advance in the solder for joining the heat exchange pipe and the fin. Yes. In general, a flux is required when joining a base material with a brazing material. For this reason, if the brazing material containing the flux 60 as shown in the figure is used, the heat exchange pipe and the fin can be stably brazed, so that the heat exchanger can be reliably assembled. The production quality can be stabilized. 18 corresponds to the one shown in FIG. 1, the one shown in FIG. 19 corresponds to the one shown in FIG. 5, and the one shown in FIG. 20 corresponds to the one shown in FIG. Correspondingly, the one shown in FIG. 21 corresponds to the one shown in FIG. 13, the one shown in FIG. 22 corresponds to the one shown in FIG. 9, and the one shown in FIG. 23 is the one shown in FIG. 24 corresponds to that shown in FIG. 8, and the same reference numerals are given to the same or corresponding parts as those shown in the corresponding drawings.
[0086]
【The invention's effect】
  ThisAccording to the invention, the insertion portion formed in the fin is formed by the slit-like insertion recess formed so as to open at the edge portion located on the downstream side of the airflow flowing along the fin. The heat exchange pipe is inserted inward from the opening of the recess for insertion, and the wax is unevenly distributed at the downstream end of the air flow of the heat exchange pipe, and the upstream fin collar is melted by melting the wax. Since the gap between the heat exchange pipe and the fin collar and the heat exchange pipe are joined, a good heat transfer coefficient can be obtained between the heat exchange pipe and the fin, and air resistance There is an effect that can be reduced. In addition, the clearance between the heat exchange pipe and the fin collar can be increased, and the relative movement between the heat exchange pipe and the insertion recess can be reduced. The insertion work can be easily performed, the productivity of the heat exchanger can be increased, and there is an effect that it can be configured at low cost.
[0087]
  According to the following inventionTheSince the notch portion is formed in the central portion of the ink collar, it is possible to obtain a good heat transfer coefficient between the heat exchange pipe and the fin, as well as the above invention, and to reduce the air resistance, Since the clearance between the heat exchange pipe and the fin collar can be increased, the heat exchange pipe can be easily inserted into the fin collar, and the productivity of the heat exchanger can be increased and the structure is inexpensive. In addition, there is an effect that the water condensed in the fins can be easily drained by the notch at the center.
[Brief description of the drawings]
FIG. 1 is a view for explaining a first example of a heat exchanger according to a first embodiment for carrying out the present invention, in which (a) shows a state in which a heat exchange pipe is inserted into an aluminum fin. The perspective view which shows the state before performing brazing, (b) is heating from the state shown to (a), and melt | dissolves the wax unevenly distributed in the heat exchange pipe, and brazes the heat exchange pipe and the aluminum fin. The perspective view which shows the attached state, (c) is a partially longitudinal front view which shows an aluminum fin.
FIG. 2 is an explanatory vertical side view showing a relationship between a heat exchange pipe and a fin of the heat exchanger, and FIG. 2 (a) shows a state in which the heat exchange pipe and the fin are brazed in the first embodiment of the present invention. (B) shows a state in which fins having a uniform brazing surface are used, and (c) shows a brazing state in the case of using fins or a heat exchange pipe in which brazing is uniformly arranged.
FIG. 3 is a diagram showing the relationship between the wax uneven distribution position and the average heat transfer coefficient with respect to the airflow direction.
FIG. 4 is an explanatory plan view showing a second example of the heat exchanger according to the first embodiment for carrying out the present invention, in which (a) shows a state in which the heat exchange pipe is fitted into the aluminum fin. The state before brazing is shown, and (b) is a state in which heating is performed from the state shown in (a), the wax unevenly distributed in the heat exchange pipe is melted, and the heat exchange pipe and the aluminum fin are brazed. Is shown.
FIG. 5 is a perspective view showing a heat exchanger according to a second embodiment for carrying out the present invention, in which (a) is a state in which a heat exchange pipe is inserted into an aluminum fin before brazing. (B) shows a state where heating is performed from the state shown in (a), the wax unevenly distributed in the heat exchange pipe is melted, and the heat exchange pipe and the aluminum fin are brazed, (c) FIG. 3 is a partially longitudinal front view showing an aluminum fin.
FIG. 6 is a front view for explaining a first example of a heat exchanger according to a third embodiment for carrying out the present invention, in which (a) is a state in which a heat exchange pipe is fitted into an aluminum fin; The state before brazing is shown, and (b) is heated from the state shown in (a) to melt the unevenly distributed wax in the heat exchange pipe and braze the heat exchange pipe and the aluminum fin. Shows the state.
FIG. 7 is a front view for explaining a second example of the heat exchanger according to the third embodiment for carrying out the present invention;
FIG. 8 is a front view for explaining a third example of the heat exchanger according to the third embodiment for carrying out the present invention;
FIG. 9 is a perspective view for explaining a first example of a heat exchanger according to a fourth embodiment for carrying out the present invention;
FIG. 10 is a perspective view for explaining a second example of the heat exchanger according to the fourth embodiment for carrying out the present invention;
FIG. 11 is a perspective view for explaining a third example of the heat exchanger according to the fourth embodiment for carrying out the present invention;
FIG. 12 is a perspective view for explaining a fourth example of the heat exchanger according to the fourth embodiment for carrying out the present invention;
FIG. 13 is a front view for explaining a first example of a heat exchanger according to a fifth embodiment for carrying out the present invention, in which (a) is a state in which a heat exchange pipe is fitted into an aluminum fin; The state before brazing is shown, and (b) is heated from the state shown in (a) to melt the unevenly distributed wax in the heat exchange pipe and braze the heat exchange pipe and the aluminum fin. Shows the state.
FIG. 14 is a perspective view for explaining a second example of the heat exchanger according to the fifth embodiment for carrying out the present invention, in which (a) is a state in which the heat exchange pipe is fitted into the aluminum fin. The state before brazing is shown, and (b) is heated from the state shown in (a) to melt the unevenly distributed wax in the heat exchange pipe and braze the heat exchange pipe and the aluminum fin. Shows the state.
FIG. 15 is a perspective view for explaining a third example of the heat exchanger according to the fifth embodiment for carrying out the present invention;
FIG. 16 is a perspective view for explaining a fourth example of the heat exchanger according to the fifth embodiment for carrying out the present invention;
FIG. 17 is a perspective view for explaining a fifth example of the heat exchanger according to the fifth embodiment for carrying out the present invention;
FIG. 18 is a front view for explaining a first example of a heat exchanger according to a sixth embodiment for carrying out the present invention;
FIG. 19 is a front view for explaining a second example of the heat exchanger according to the sixth embodiment for carrying out the present invention;
FIG. 20 is a front view for explaining a third example of the heat exchanger according to the sixth embodiment for carrying out the present invention;
FIG. 21 is a front view for explaining a fourth example of the heat exchanger according to the sixth embodiment for carrying out the present invention;
FIG. 22 is a front view for explaining a fifth example of the heat exchanger according to the sixth embodiment for carrying out the present invention;
FIG. 23 is a front view for explaining a sixth example of the heat exchanger according to the sixth embodiment for carrying out the present invention;
FIG. 24 is a front view for explaining a seventh example of the heat exchanger according to the sixth embodiment for carrying out the present invention;
FIG. 25 is an exploded perspective view showing a conventional heat exchanger.
[Explanation of symbols]
1 heat exchange pipe, 2 brazing (brazing material), 3 fins, 4 insertion holes, 5 fin collar, 21 heat exchange pipe (flat tube), 22 brazing (brazing material), 23 fins, 24 fitting insertion holes, 25 fins Collar, 31 Heat exchange pipe, 32 Brazing (brazing material), 33 Fin, 34 Insertion hole (recess for insertion), 35 Fin collar, 41 Heat exchange pipe (flat tube), 42 Brazing (brazing material), 43 Fin 44, insertion hole, 45 fin collar, 51 heat exchange pipe, 52 brazing (brazing material), 53 fin, 54 fitting insertion hole (recess for insertion), 55 fin collar, 55a, 55b notch, 60 flux, d Drainage hole, g gap.

Claims (7)

A metal fin having a metal heat exchange pipe for conducting the refrigerant, a fitting insertion portion for fitting the heat exchange pipe, and a curved portion facing the peripheral surface of the heat exchange pipe fitted in the fitting insertion portion In a heat exchanger comprising a fin formed by a metal plate-like member projecting a collar, and joining the fin collar and a heat exchange pipe inserted therethrough by a brazing material,
The wax used for joining the heat exchange pipe and the fin collar is unevenly distributed by partially contacting or joining the outer surface of the heat exchange pipe;
With the fin collar and the heat exchange pipe fitted, the wax brought into contact with or joined to the heat exchange pipe is heated and melted so that the wax flows into the gap between the heat exchange pipe and the fin collar. And the heat exchange pipe and the fin collar are joined by the filled solder ,
The insertion part formed in the fin is formed by a slit-like insertion recess formed so as to open at an end edge located on the downstream side of the airflow flowing along the fin, and the heat exchange pipe Is inserted inward from the opening of the recessed portion for insertion, and the wax is unevenly distributed at the downstream end of the air flow of the heat exchange pipe, and is melted between the fin collar on the upstream side and the heat exchange pipe. A heat exchanger characterized by filling a gap and joining a fin collar and a heat exchange pipe . The heat exchanger according to claim 1, wherein the heat exchange pipe is a flat tube. The heat exchange pipe is composed of a plurality of flat tubes that are inserted into the same insertion portion of the fin, and the wax is unevenly distributed on the outer surface of the flat tube by contacting or joining the plurality of adjacent flat tubes. The heat exchanger according to claim 1 or 2 , characterized in that. The heat exchanger according to claim 3 , wherein a notch portion is formed in a central portion of the fin collar. The heat exchanger according to any one of claims 1 to 3, wherein an end of the fin collar is missing. The heat exchanger according to any one of claims 1-5, characterized by containing a flux in brazing unevenly distributed on the outer surface of the heat exchange pipe. A metal fin having a metal heat exchange pipe for conducting the refrigerant, a fitting insertion portion for fitting the heat exchange pipe, and a curved portion facing the peripheral surface of the heat exchange pipe fitted in the fitting insertion portion In a heat exchanger comprising a fin formed by a metal plate-like member projecting a collar, and joining the fin collar and a heat exchange pipe inserted therethrough by a brazing material,
The wax used for joining the heat exchange pipe and the fin collar is unevenly distributed by partially contacting or joining the outer surface of the heat exchange pipe ;
With the fin collar and the heat exchange pipe fitted, the wax brought into contact with or joined to the heat exchange pipe is heated and melted so that the wax flows into the gap between the heat exchange pipe and the fin collar. And the heat exchange pipe and the fin collar are joined by the filled solder,
The heat exchange pipe is composed of a plurality of flat tubes that are inserted into the same insertion portion of the fin, and the wax is unevenly distributed on the outer surface of the flat tube by contacting or joining the plurality of adjacent flat tubes. ,
A heat exchanger, wherein a notch portion is formed in a central portion of the fin collar.

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