JPH09329398A - Manufacture of finned coil heat exchanger and aluminum plate fin employed for the manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a finned coil heat exchanger which is capable of preventing favorably the generation of fin pitching disturbance without increasing working and economical burdens when expanding and fixing heat transfer tubes together with aluminum fins used for the manufacture. SOLUTION: A plurality of aluminum plate fins 10, which turn the surrounding area of a mounting hole 14 of a plate fin main body 12 into a slanting or curved taper area 22, which gradually increase the size larger than the diameter of the mounting hole 14 toward the direction opposite to the formation side of fin collars 18, are laminated in such a state that they may come in contact with each other in the tapers area 22 and a flare area 20 of a fin collar 18. Then, a plug 28 is pushed into a heat transfer tube 16 which is inserted into the mounting hole 14 coaxially with the fin collar 18 and is adapted to move in the axial direction of the heat transfer tube 16, thereby expanding and fixing the heat transfer tube 16 with the plurality of aluminum plate fins 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a fin coil type heat exchanger and an aluminum plate fin used for the same, and in particular, when a heat transfer tube is expanded and fixed to the aluminum plate fin, fin pitch disorder occurs. The present invention relates to a method for manufacturing a fin-coil heat exchanger that can be effectively prevented, and an aluminum plate fin advantageously used for the method.

[0002]

2. Description of the Related Art Conventionally, heat exchangers operating as evaporators or condensers have been used in air conditioners such as home air conditioners, automobile air conditioners, package air conditioners, and refrigerators. And as a kind of such heat exchanger,
For example, there is a fin coil heat exchanger (plate fin tube heat exchanger) that is generally used in home room air conditioners, commercial package air conditioners and the like. As is well known, this is because a plate member made of aluminum is first subjected to a predetermined press working to form a plurality of mounting holes in the plate fin body and the plurality of mounting holes. A cylindrical fin collar is provided integrally around the periphery of the plate fin body so as to extend integrally from the same surface side of the plate fin body, and is further bent or curved outward in the radial direction at the tip portion of the fin collar. A plurality of aluminum plate fins provided with flared portions are formed, and the plurality of aluminum plate fins are arranged so that the plurality of assembly holes correspond to each other and the fin collars are located on the same side. After stacking, insert a separately prepared heat transfer tube into each assembly hole, and then expand and fix the heat transfer tube to each aluminum plate fin, It is as it is.

By the way, in recent years, when a finned coil heat exchanger is manufactured according to such a process, a thin and hard material is used as a method for forming an aluminum plate fin in order to reduce the material cost. The drawless method has been widely adopted. Therefore, in the thus-obtained fin coil type heat exchanger, the plurality of aluminum plate fins are made of a thin and hard material, which not only reduces the cost but also increases the tension of the heat transfer tube. Although it is expected that the heat exchange efficiency will be improved by the fact that when the heat transfer tubes are expanded and fixed to the aluminum plate fins, the aluminum plate fins stick to each other, causing a so-called fin pitch disorder (Abeck phenomenon). Not only impairs the appearance, but also makes it easier for water droplets to accumulate, which significantly increases the draft resistance of the air passing between the fins, resulting in a decrease in heat exchange efficiency, contrary to initial expectations. That was often the case.

Moreover, in such a fin coil type heat exchanger, recently, the spacing between aluminum plate fins, that is, the fin pitch, tends to be narrowed in order to improve the heat exchange efficiency by increasing the fin surface area. However, this also easily causes the above-mentioned disturbance of the fin pitch, and thus the intended effect of improving the heat exchange efficiency could not be sufficiently enjoyed.

In Japanese Patent Laid-Open No. 1-169299, the surface average roughness and the contact angle with the press oil are specified by performing a predetermined surface adjustment as a measure for preventing such fin pitch disorder. It is disclosed that the aluminum plate fin material is formed by using the aluminum plate fin material adjusted to have a value in the range. Further, there is a plurality of aluminums stacked on top of each other due to contraction (shortening) of the length of the heat transfer tube in the axial direction of the heat transfer tube, which is caused by an increase in the tube diameter of the heat transfer tube as a cause of the fin pitch disorder. The contact resistance (contact pressure) between the plate fins can be increased,
By taking the above-mentioned measures, the frictional resistance of the surface of the aluminum plate fin is reduced, and such contact resistance is reduced, and as a result, the fin pitch disturbance is prevented. Have been revealed.

However, when the measures disclosed in the above publication are adopted, the process and equipment for performing a predetermined surface adjustment on the material that gives the aluminum plate fins are
Since it will be newly added to the process and equipment for forming the aluminum plate fins, in order to prevent such fin pitch disturbance, when forming the aluminum plate fins, it is necessary to use the fin coil type heat exchanger. There was a major problem inherent in that the operational and economic burden during manufacturing was increased.

[0007]

The present invention has been made in view of such circumstances, and a problem to be solved by the present invention is to expand a heat transfer tube without causing an increase in work and economic burden. A method for manufacturing a fin coil type heat exchanger, which can advantageously prevent the occurrence of fin pitch disturbance when adhered,
It is to provide an aluminum plate fin that can be advantageously used for that purpose.

[0008]

In order to solve such a problem, the inventors of the present invention firstly arrange a plurality of aluminum plate fins vertically, and a heat transfer tube is integrally formed in each assembly hole of the plate fins. As a result of observing the occurrence state of fin pitch disturbance in the conventional fin coil type heat exchanger that is assembled as shown in FIG. 7, as is clear from FIG. The plate fins 34 arranged at the tube expansion start portion when the heat transfer tube 16 is fixed to the plate fins 34 are all rising angles of the fin collar 18 from the plate fin body 12, that is, the root angle of the fin collar 18: α
Is obtuse, the plate fin 34 arranged in the tube axial direction intermediate portion of the heat transfer tube 16 has a root angle α of the fin collar 18 as shown in FIG. 7B. There is a mixture of the obtuse angle and the acute angle, and the fin pitch disorder is concentrated,
Further, as shown in FIG. 7C, in the plate fins 34 arranged at the lower portion of the heat transfer tube 16 which is the end portion of the pipe expansion, the fin pitch disorder is not observed, but the root angle of the fin collar 18 is not observed. : It was confirmed that all α were sharpened. This is considered to be due to the following reasons.

That is, when a plurality of plate fins 34 are stacked vertically and the heat transfer tube 16 is inserted into each of the assembling holes 14, the heat transfer tube 16 is expanded.
The inner diameter of each assembling hole 14 can be expanded together with the outer diameter of the plate fin 34. However, at this time, since the plate fin 34 is usually made of a very thin plate material of about 0.10 to 0.12 mm. In addition, the change in the outer diameter of the heat transfer tube 16 cannot be absorbed by the change in the inner diameter of each assembling hole 14 in each plate fin 34, that is, the in-plane deformation alone, and the change in the root angle α of the fin collar 18. As a result, the deformation to the out-of-plane is caused. When such an out-of-plane deformation occurs, the root angle of the fin collar 18: α
Since it is more stable to form an obtuse angle, each plate fin 34 tries to deform so that the root angle α of the fin collar 18 increases.

On the other hand, as disclosed in the above publication, when the heat transfer tube 16 is expanded, the length of the heat transfer tube 16 in the axial direction is inevitably contracted (shortened) as the diameter of the heat transfer tube 16 is increased. To be Then, the contraction of the heat transfer tube 16 in the tube axis direction is transmitted to the entire heat transfer tube 16 and is caused even in the portion where the tube expansion has not been performed yet. Therefore, the fin collar 18 of the plate fin 34 arranged in the unexpanded portion of the heat transfer tube 16 undergoes compressive deformation corresponding to the contraction amount of the heat transfer tube 16,
As a result, a compression reaction force that is a repulsive force against the compression deformation is generated. As a result, the contact pressure at the contact portion between the flare portion 20 of the fin collar 18 and the plate fin body 12 of the plate fin 34 located immediately below the flare portion 20 is increased. Moreover, the heat transfer tube 16
The amount of shrinkage in the tube axial direction in the unexpanded portion of the heat transfer tube 16
Of the plate fins 34 arranged in the unexpanded portion, the amount of compressive deformation of the fin collars 18 and the compression reaction force thereof, and further, in the contact portion between the plate fins 34. The contact pressure is also significantly increased as the heat transfer tube 16 expands.

Therefore, all of the plurality of plate fins 34 stacked on top of each other except the one located at the top, which is first deformed by the expansion of the heat transfer tube 16, are fin collars 18. In the state where the contact pressure between the plate fins 34 abuts each other is increased, and the arrangement position is downward and rearward in the traveling direction of the tube expansion, With the compression reaction force and the contact pressure further increased, the expansion of the heat transfer tube 16 causes the in-plane deformation and the out-of-plane deformation as described above.

Therefore, when the heat transfer tube 12 is expanded, in the plate fins 34 which are initially expanded, the plate fins 34 are arranged in the upper part of the heat transfer tube 16, the compression deformation amount of the fin collar 18 is also reduced. Since the reaction force is small and the contact pressure between the plate fins 34 abutting each other is also small, the fin collar 18 is deformed in a stable direction against the contact pressure so that the root angle α of the fin collar 18 becomes obtuse. However, in the plate fins 34 arranged in the axially intermediate portion of the heat transfer tube 16, which is the portion where the tube expansion has progressed to some extent, the amount of compressive deformation of the fin collar 18 increases and the compression reaction force also increases. As a result, the contact pressure is also increased to some extent. The fin collar 18 cannot be moved against the contact pressure and is deformed in a direction in which the root angle α of the fin collar 18 is sharpened, so that the root angle α of the fin collar 18 is sharpened in the axially intermediate portion of the heat transfer tube 16. The plate fins 34 that are respectively deformed in the direction and the direction in which the angle becomes obtuse are mixed, and as a result, fin pitch irregularity occurs intensively.
Then, the plate fins 3 arranged at the lower portion of the heat transfer tube 12, which is the end portion of the further expanded tube.
In the case of No. 4, the amount of compressive deformation of the fin collar 18 and its compressive reaction force become extremely large, so that the contact pressure is also significantly increased. That is, the root angle α of the fin collar 18 is deformed in a direction in which it becomes an acute angle without countering such a contact pressure.

In short, from the observation result of the occurrence state of the fin pitch disturbance in the conventional fin coil type heat exchanger, the fin pitch disturbance is arranged in the unexpanded portion of the plate fins 34 during the expansion of the heat transfer tube 16. Due to the compressive deformation and the compressive reaction force generated in the fin collar 18 of the above, the contact pressure of the abutting portions of the plate fins 34 is deformed by the expansion of the heat transfer tube 16 while being increased to some extent. It was considered that it was caused by something.

Therefore, the inventors of the present invention have performed a compressive deformation and a compressive reaction force generated in the fin collar 18 of the aluminum plate fins 34 in such an unexpanded portion, and the contact between the plate fins 34 caused by them. The idea was to prevent the occurrence of fin pitch disorder by eliminating or relaxing the increase in the contact pressure at the site when the heat transfer tube 16 was expanded, and further examined the specific means for realizing it. As a result, the present invention has been completed.

It should be noted that, like the aluminum plate fins 34 arranged at the portion corresponding to the expansion end portion of the heat transfer tube 16, the plate fins 34 are made to have a larger compressive deformation and a compressive reaction force, so that the plate fins 34 are made larger.
It may be possible to prevent the fin pitch from being disturbed by significantly increasing the contact pressure at the abutting portions of the plates, but in that case, prior to the expansion operation of the heat transfer tubes 16, a plurality of stacked plates are stacked. An extra step such as adding preliminary compression to the fins 34 is required,
Not realistic.

The present invention has been completed through the above process, and the gist of the present invention is to provide a cylindrical fin collar around a plurality of assembly holes formed in the plate fin body. The aluminum is provided so as to integrally extend from the same surface side of the plate fin body, and the flare portion formed by bending or curving outward in the radial direction is provided at the tip end portion of each fin collar. Using a plurality of plate fins, after stacking the plurality of aluminum plate fins so that the plurality of assembly holes correspond to each other and the fin collars are located on the same side, in the plurality of assembly holes, The heat transfer tube is inserted coaxially with the fin collar, and then a plug is pushed into the heat transfer tube to move in the axial direction of the heat transfer tube to expand the heat transfer tube. By caulking, the the heat transfer tubes are assembled integrally with the aluminum plate fin of the plurality of, in manufacturing the Findokoiru heat exchanger, said assembly hole surrounding portion of the plate fin body,
In the direction opposite to the fin collar forming side,
Aluminum plate fins having a tapered portion having an inclined surface or curved surface shape gradually increasing in diameter from the diameter of the assembling hole are used, and a plurality of them are stacked on top of each other, and the plates of one of them are stacked on top of each other. The fin collar is arranged so that the tapered portion of the fin body and the flared portion of the fin collar of the other fin body come into contact with each other, and further, the fin collar of the fin collar is inserted into the heat transfer tube inserted coaxially with the fin collar. This is a method for manufacturing a fin coil type heat exchanger in which the plug is pushed in from the flare portion forming side or the side opposite to the flare portion forming side to move the plug in the axial direction of the heat transfer tube. .

That is, in the method for manufacturing the fin coil type heat exchanger according to the present invention, the portion around the assembling holes of the plate fin body is directed toward the side opposite to the fin collar forming side. A plurality of aluminum plate fins having a special shape, which are configured as tapered or curved tapered portions gradually increasing in diameter from the diameter of the holes, are brought into contact with each other at the tapered portions and the flared portions of the fin collar. In this state, the fins are stacked, and then the plugs are pushed into the heat transfer tubes inserted in the fin collars from the flare forming side of the fin collars, in other words, from the small diameter side of the taper portion or from the opposite side. Then, by moving the heat transfer tube in the axial direction so as to expand the heat transfer tube, it has a great feature not seen in the conventional method. It's that.

Therefore, according to such a method of the present invention,
In the heat transfer tube, the aluminum plate fins, which are arranged at the portion where the plug reaches and the tube is being expanded, are stacked on the tapered portion of the plate fin as the plug moves through. While changing the contact position of the other aluminum plate fin with the flare part, the aluminum plate fin is inclined toward the front side or the rear side in the moving direction of the plug, and after passing through the plug, it is perpendicular to the tube axis direction of the heat transfer tube. It is possible to return to the same state as before reaching the plug, which extends in the direction,
At that time, according to the inclined contact form between the taper portion and the flare portion of the adjacent aluminum plate fins, or with the return movement of the aluminum plate fins arranged in the portion during such pipe expansion, the plates are flared. By exhibiting the behavior that the tapered portion or flared portion of the fin is separated from the flared portion or tapered portion of another aluminum plate fin stacked on it,
The compressive deformation and the compressive reaction force occurring in the fin collar in which the flare portion is formed, and the resulting increase in the contact pressure between the flare portion and the taper portion, are advantageously eliminated or alleviated, respectively. It can be done.

Moreover, in the method of the present invention, as described above, when a plurality of aluminum plate fins are stacked on each other, the taper part of the plate fin body of one and the flare part of the fin collar of the other are stacked on each other. When placing the heat transfer tubes in contact with each other and expanding the heat transfer tubes inserted in the respective assembly holes, push the plugs from the flared portion formation side of the fin collar or the opposite side, and insert the plugs into the heat transfer tube. A manufacturing process similar to the conventional one is adopted, except that it is moved in the axial direction.In addition, such a tapered portion simply takes into consideration the shape of the molding die used during press molding of aluminum plate fins. By simply (changing), the plate fin is molded and at the same time the pole is attached to the plate fin body. Therefore, according to the method of the present invention, when actually manufacturing the find coil heat exchanger, a new process is added to the manufacturing process of the general find coil heat exchanger and its equipment. There is no such thing as adding special equipment or the like.

Therefore, according to the method for manufacturing the fin coil type heat exchanger according to the present invention, the work and economic burdens associated with the addition of new steps and facilities are not increased.
When the heat transfer tube is expanded and fixed to the aluminum plate fin, the fin pitch disturbance can be advantageously prevented, and as a result, the fin coil heat exchange has a good appearance and exhibits excellent heat exchange efficiency. The vessel can be manufactured very advantageously.

Further, as described above, in the method of the present invention, the fin pitch can be effectively prevented from being generated, so that the fin pitch can be advantageously narrowed, whereby the manufactured fin coil is manufactured. The improvement of the heat exchange efficiency of the conventional heat exchanger can be achieved even more advantageously.

According to a preferred embodiment of the method for manufacturing the fin coil type heat exchanger according to the present invention, when the plurality of aluminum plate fins are stacked on each other, one of the stacked plate fin bodies is tapered. The tapered portion such that the angle formed by the normal line at the point of contact between the other portion and the flare portion of the fin collar and the central axis of the fin collar exceeds 0 degree and is 45 degrees or less. A configured aluminum plate fin is used so that, during expansion of the heat transfer tube, the compression deformation that occurs in such a fin collar as the aluminum plate fin is moved back to the predetermined arrangement state after passing through the plug. And a compression reaction force, and further, the flare portion and the taper portion due to the compression reaction force. Increase of contact pressure, respectively, to obtain a more advantageously suppressed, the occurrence of fin pitch disturbance Te than, more than the fact that can be more reliably prevented.

Further, according to the present invention, in the aluminum plate fin used in the method for manufacturing the fin coil type heat exchanger as described above, a cylindrical shape is provided around the plurality of assembly holes formed in the plate fin body. The fin collars are provided so as to integrally extend from the same surface side of the plate fin body, and flare portions formed by bending or curving outward in the radial direction are provided at the tip end portions of the fin collars. Further, the peripheral portion of the assembly hole of the plate fin main body is inclined toward the direction opposite to the fin collar forming side and has a diameter gradually larger than the diameter of the assembly hole. It is also a feature that it is configured as a tapered portion having a curved surface form.

In such an aluminum plate fin according to the present invention, the peripheral portion of the assembling hole of the plate fin main body extends in the direction opposite to the fin collar forming side from the diameter of the assembling hole. Since it is configured as a taper portion having an inclined surface or a curved surface shape that gradually becomes larger in diameter, the characteristic manufacturing method as described above can be advantageously adopted when manufacturing the fin coil type heat exchanger. As a result, it is possible to advantageously manufacture a fin coil type heat exchanger in which the occurrence of fin pitch disturbance can be advantageously prevented without causing any operational and economic problems. An excellent appearance and a high degree of heat exchange efficiency can be effectively imparted to such a fin coil type heat exchanger.

In addition, in such an aluminum plate fin, since the peripheral portion of the assembling hole of the plate fin body is formed as the tapered portion having the above-described structure, the heat transfer tube is provided to the assembling hole. When inserting it, the inclined surface or curved surface of the taper part,
It can be made to function as a guide surface for guiding the heat transfer tube into the assembling hole, so that the heat transfer tube can be satisfactorily inserted from the flare forming side of the fin collar as in the conventional case, and also from the opposite side. It can be satisfactorily and surely inserted, and as a result, the advantage that the insertability of the heat transfer tube into the assembly hole can be effectively improved is obtained.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS By the way, FIG. 1 shows an example of an aluminum plate fin that is preferably used when a fin coil type heat exchanger is manufactured according to the method of the present invention.
It is shown schematically. As is clear from FIG. 1, the aluminum plate fin 10 is formed by press-molding a thin plate material made of an aluminum alloy. The plate fin 10 has a plate fin body 12 having a substantially flat plate shape,
The plate fin body 12 has a plurality of assembly holes 14 formed therethrough in the thickness direction. In addition, a cylindrical fin collar 18 having a predetermined height and an inner diameter slightly larger than the outer diameter of the heat transfer tube 16 described below is provided around each of the assembling holes 14 on the same surface side of the plate fin body 12. Are integrally formed in the vertical direction. Further, the fin collar 18 is configured as a flare portion 20 in which the tip end portion is curved so as to warp outward in the radial direction.

Further, in the plate fin 10 as described above, the flare portion 20 of the fin collar 18 faces the axial direction of the fin collar 18 in the peripheral portion of the assembly hole 14 of the plate fin body 12. As the tapered portion 22 that surrounds the assembly hole 14,
It is configured. Further, the taper portion 22 has a taper shape having an inclined surface shape in which the diameter gradually becomes larger than the diameter of the assembling hole 14 toward the side opposite to the direction in which the fin collar 18 extends from the plate fin body 12.
Made of

The degree of inclination of the taper portion 22 of the plate fin body 12 in the plate fin 10 is not particularly limited, but it is advantageous to use a plurality of plate fins as shown in FIG. 10, the tapered portion 22 and the fin collar 1 that come into contact with each other when they are vertically stacked so that the assembling holes 14 correspond to each other.
The angle: β formed by the normal line m at the point of contact with the flare portion 20 of 8 and the central axis n of the fin collar 18 is within a range of more than 0 degrees and 45 degrees or less. Is desirable. Then, the taper portion 22 of the plate fin 10 and the flare portion 2 of the fin collar 18 are formed.
The surface where the normals of the circle formed by the contact points with 0 meet is a conical or funnel shape with the central axis of the fin collar 18 (heat transfer tube) as the central axis.

Because, as described above, the plate fin 1
In No. 0, the plate fin main body 12 has a peripheral portion of each assembling hole 14 formed into the tapered portion 22 having the above-described inclined surface form, so that the assembling hole 14 can be inserted into each assembling hole 14. When the expanded heat transfer tube 16 is fixed by expansion, the compression deformation of the fin collar 18 and the compression reaction force thereof caused by the contraction of the axial length of the heat transfer tube 16 accompanying the expansion, and the plate fin caused by them Taper part 22 and flare part 2 which are contact parts of 10 comrades
The increase of the contact pressure between 0 and 0 can be advantageously eliminated or relieved.
When the degree of inclination of 2 is out of the above range,
This is because such effects cannot be fully enjoyed.

A plurality of aluminum plate fins 10 having such a structure are used, and the desired fin coil type heat exchanger is manufactured advantageously as shown in FIGS. 2 to 4. That will be the case.

That is, first, as shown in FIG. 2, a plurality of plate fins 10 are vertically stacked so that a plurality of assembly holes 14 are associated with each other and each fin collar 18 is located on the same side. . More specifically,
Each plate fin 10 has a fin collar 18 extending upward and a tapered portion 22 of the plate fin body 12.
Are arranged so as to incline downward, and under such an arrangement, the plurality of plate fins 10 are attached to the flare portion 20 of each fin collar 18.
And the taper portion 22 of the plate fin body 12 are stacked so as to be in contact with each other.
As a result, the assembly holes 14 are formed at the positions where the assembly holes 14 of the plate fins 10 stacked in the vertical direction are formed.
The through holes 26 that extend in the up-down direction and that are formed of the fin collars 18 that are formed around the respective holes are formed.

Next, as shown in FIG. 3, under the stacked state as described above, the hairpins separately molded from the lower opening side into the insertion holes 26 provided in the plurality of plate fins 10. The heat transfer tube 16 made of a copper tube is inserted. At that time, the heat transfer tube 16 is arranged in the insertion hole 26 coaxially with each fin collar 18 constituting the insertion hole 26.

Thereafter, as shown in FIG. 4, the heat transfer tube 1
A plug 28 having an outer diameter larger than the inner diameter by a predetermined dimension is pushed in from each opening side of 6, and further moved downward (in the arrow direction in FIG. 4) along the tube axis direction of the heat transfer tube 16, The heat transfer tube 16 is expanded, whereby the heat transfer tube 16 is integrally assembled to the plurality of plate fins 10, and thus the desired fin coil heat exchanger is obtained.

When the heat transfer tube 16 is expanded in this way, the length of the heat transfer tube 16 in the tube axis direction is contracted as the diameter of the tube is increased.
Since the plate fins 10 arranged in the portions of the heat transfer tubes 16 that have not yet been expanded are subjected to compressive deformation in the fin collar 18 according to the amount of contraction of the heat transfer tubes 16, a compression reaction force is generated. However, due to the passage movement of the plug 28 in the heat transfer tube 16, the plate fin 10 once tilted to the front side in the moving direction of the plug 28 is moved to the plug 2
When the plug 28 is returned to the same state as before the arrival of the plug 28 after the passage of 8, the tapered portion 22 of the other plate fin 10 is brought into contact with the plate fin 10 along with the return movement of the plate fin 10. The flare portion 20 behaves as if it were separated from the flare portion 20, whereby the flare portion 20 is separated.
The compressive deformation and the compressive reaction force occurring in the fin collar 18 in which the ribs are formed can be advantageously canceled or alleviated, so that the contact pressure between the flare portion 20 and the taper portion 22 abutting each other can be reduced. The increase can be effectively suppressed.

Therefore, according to the manufacturing method of such a fin coil type heat exchanger, the heat transfer tubes 16 are expanded to the plate fins 10 stacked on each other with a small contact pressure. The deformation effect of the fins can be induced, and thereby the fin pitch disturbance can be effectively prevented. As a result, a fin coil type heat exchanger having an excellent appearance and heat exchange efficiency can be manufactured extremely advantageously.

In addition, in such a manufacturing method, as described above, the excellent characteristics as described above are exhibited only by devising the shape of the plate fin 10 to be used and the arrangement form of a plurality of such plate fins 10. Therefore, when actually manufacturing a fin coil heat exchanger, it is necessary to add any special process or equipment to the general manufacturing process or manufacturing equipment of the heat exchanger. If nothing happens, it can be effectively prevented from deteriorating its workability and economic efficiency.

Further, in the above-described method, a plurality of plate fins 10 each having a tapered portion 22 at the peripheral portion of each assembling hole 14 of the plate fin main body 12 are provided. Since the fin collars 18 are made to correspond to each other and are vertically stacked in a state where the fin collars 18 are located on the same side,
When the heat transfer tube 16 is inserted coaxially with the fin collar 18 into the inside of the fin 4, the flare portion 20 of the fin collar 18 is inserted.
Both the tapered portion 22 and the tapered portion 22 can be made to function well as a guide portion of the heat transfer tube 16 into the assembly hole 14, and the heat transfer tube 16 can be provided on either the flare portion 20 side or the tapered portion 22 side. From the side as well, it can be satisfactorily inserted into the assembly hole 14, so that there can be advantageously no restriction on the insertion direction of the heat transfer tube 16 into the assembly hole 14,
The insertability of the heat transfer tube 16 into the assembly hole 14 can be effectively enhanced.

By the way, in the above-described manufacturing method, the plurality of aluminum plate fins 10 each having the tapered portion 22 of the plate fin main body 12 having the inclined surface shape are used, but the tapered portion 22 has the curved surface shape. It is also possible to configure.

That is, as shown in FIG. 5, the taper portion 22 of the assembling hole 14 faces toward the side of the fin collar 18 opposite to the side where the flare portion 20 is provided in the axial direction of the fin collar 18. It is also possible to use an aluminum plate fin 30 having a curved surface shape that gradually becomes larger than the diameter. The curved surface-shaped tapered portion 22 is usually formed with a radius of curvature larger than that of the flare portion 20.

Even when the plate fin 30 having such a structure is used, the fin-coil heat exchanger is manufactured in the same manner as described above, so that the expansion of the heat transfer tube 16 can proceed. Accordingly, the compressive deformation and the compressive reaction force generated in the fin collar 18 can be effectively eliminated or alleviated, whereby the increase of the contact pressure between the plate fins 30 can be advantageously suppressed, and as a result, As a result, it is possible to effectively prevent the fin pitch from being disturbed when the heat transfer tube 16 is expanded. Moreover, even in such a case, similarly to the case where the plate fin 10 is used, it is possible to advantageously avoid an increase in work and economic burden in obtaining such an excellent effect. .

In the aluminum plate fin 30 as well, the degree of inclination of the tapered portion 22 is not limited in any way, but for the reasons described above, like the plate fin 10, the plurality of plate fins 3 are provided.
When 0s are stacked vertically, the angle formed by the normal line at the contact point between the tapered portion 22 and the flare portion 20 of the fin collar 18 that are in contact with each other and the central axis of the fin collar 18 is
It is desirable that the range is set to exceed 0 degree and 45 degrees or less.

Further, although the tapered portions 22 in the illustrated aluminum plate fins 10 and 30 are each configured with one inclination angle or curvature radius, the present invention is limited to the tapered portions having such a form. However, there is no problem even if such a tapered portion 22 is formed with two or more inclination angles and curvature radii.

In the manufacturing method described above, the process shown in FIG.
, The plug 28 is pushed into the heat transfer tube 16 from the flare portion 20 formation side of the fin collar 18,
It is designed to expand the pipe, but conversely,
As shown in (a) and (b) of the present invention, even if the plug 28 is pushed into the heat transfer tube 16 from the opposite side of the fin collar 18 from the side where the flare portion 20 is formed, a predetermined tube expansion is performed. The purpose of can be advantageously achieved. 6A shows the plate fin 10 shown in FIG.
6B shows the case where the plate fin 30 shown in FIG. 5 is used.

In the method described in detail above, the heat transfer tube 16 made of a hairpin copper tube as shown in FIG. 3 and FIG. 4 is used to manufacture a fin coil type heat exchanger. However, the structure of the heat transfer tube 16 is not particularly limited,
In addition to the hairpin copper pipe as shown in the figure, any of those conventionally used as the heat transfer pipe 16 for providing the fin coil type heat exchanger can be used.

Further, in the above-described manufacturing method, the portion of the aluminum plate fins (10, 30) used in the plate fin main body 12 at the peripheral portion of the assembling hole 14 is opposed to the flare portion 20 of the fin collar 18. However, the tapered portion 22 having an inclined surface or a curved surface shape
However, at least in the peripheral portion of each assembly hole 14 in the plate fin main body 12,
Another stack of aluminum plate fins (1
0, 30) is the tapered portion 2 where the flare portion 20 abuts.
As long as it is configured as 2, the range of its component parts is not particularly limited.

[0046]

EXAMPLES Some examples of the present invention will be shown below to clarify the present invention in more detail. However, the present invention is not limited by the description of such examples. Needless to say, it is not something to receive. In addition, the present invention, in addition to the following examples, in addition to the above specific description, various modifications based on the knowledge of those skilled in the art, unless departing from the spirit of the present invention,
It should be understood that modifications, improvements and the like can be made.

First, an aluminum plate fin material for drawless and DOF (Dry Oil Fin Die) having a thickness of 0.10 mm and a conventionally known water glass-based hydrophilic surface treatment material were used. Then, a hydrophilic surface treatment was performed according to a conventional method to form a water glass-based hydrophilic film on the surface of the material.

Next, as shown in FIG. 1, in the plate fin main body 12, a taper portion that gradually becomes larger in diameter than the assembly hole 14 toward the side opposite to the side where the flare portion 20 of the fin collar 18 is formed. Drawless mold of 9.52 mmφ improved so that the aluminum plate fin 10 provided with 22 can be formed [Hidaka Seiki Co., Ltd.
Prepared] was prepared. It should be noted that such a modified mold is particularly configured such that when a plurality of plate fins 10 are stacked so that the assembling holes 14 are made to correspond to each other, the taper portion 22 and the flare portion 20 of the fin collar 18 that come into contact with each other are stacked.
The taper portion 22 is formed so that the angle between the normal line at the contact point with and the central axis of the fin collar 18 (the angle indicated by β in FIG. 2) is 5 degrees, 10 degrees, and 20 degrees. The structure is such that the three types of plate fins 10 in which the inclinations are adjusted can be formed.

Using the modified mold, the aluminum plate fin material having a hydrophilic film formed on the surface, obtained as described above, is pressed to have a height of:
3 rows of 1 row 8 with a fin collar of 1.6 mm and taper portions with different inclinations
A plurality of stepped ribbed aluminum plate fins were prepared.

After that, 240 pieces of each of the three kinds of plate fins thus obtained are used, and as shown in FIG. 4, each fin collar extends upward and the flare portion of each fin collar. And the taper portion of the plate fin body are brought into contact with each other, and are stacked in the vertical direction, while the heat transfer tubes (hairpin copper tubes with inner groove of 9.52 mmφ inside each assembly hole are upwardly moved from the taper portion side). ) Was inserted coaxially with the fin collar. Then, after that, a 9.25 mmφ plug is pushed into each heat transfer tube from the flare portion forming side of the fin collar and moved downward in the axial direction of the heat transfer tube, which is the opposite direction to the extending direction of the fin collar. As a result, the heat transfer tubes are expanded and fixed to the plurality of plate fins,
Three types of fin-coil heat exchangers having different degrees of inclination of the tapered portions of each plate fin were manufactured.
Of the three types of fin-coil heat exchangers thus obtained, the angle between the normal axis of the fin collar and the normal line at the contact point between the taper portion and the flare portion, which indicates the degree of inclination of the taper portion, is Example 1 was prepared using a plurality of plate fins of 5 degrees, and was also prepared using a plurality of plate fins having the angle of 10 degrees, which indicates the degree of inclination of the tapered portion. Example 2
Further, Example 3 was prepared using a plurality of plate fins having such an angle of 20 degrees.

Five fin coil heat exchangers (Examples 1 to 3) were produced for each of the three types, and the number of fin pitch disturbances in each fin coil heat exchanger was determined by the type. I examined it separately. The results are shown in Table 1 below.

For comparison, an aluminum plate fin material having a water glass-based hydrophilic coating formed on the surface thereof, which was prepared when obtaining the fin coil heat exchangers of Examples 1 to 3, Using a general 9.52 mmφ drawless mold [manufactured by Hidaka Seiki Co., Ltd.], a plurality of aluminum plate fins having no taper portion (22) and the same shape as the conventional one were prepared. After that, 240 sheets of the obtained plate fins were used to produce a fin coil type heat exchanger according to a conventional method.

That is, first, the plurality of plate fins are stacked in the vertical direction so that the fin collars extend downward, while the fins are flared from the flare portion side in the assembling holes. A heat transfer tube (hairpin copper tube with inner groove of 9.52 mmφ) was inserted coaxially with the fin collar, and then the above-mentioned Examples 1 to 3 were performed.
Unlike the above, by pushing a 9.25 mmφ plug into each heat transfer tube from the side opposite to the flare portion formation side of the fin collar, the direction of the extension of the fin collar is the same direction as that of the heat transfer tube. The heat transfer tubes were moved downward in the tube axis direction to expand and fix the heat transfer tubes to the plurality of plate fins, and thus the intended fin coil heat exchanger was manufactured. And this was made into the comparative example 1.

Separately from this, 240 plate fins having no taper portion (22) obtained as described above are used, and each fin collar extends upward. In this way, the heat transfer tubes (9.52 mm) are stacked in the assembling holes from the side opposite to the flare side of the fin collar toward the top while being stacked vertically.
(Hair pin copper tube with inner groove of φ) is inserted coaxially with the fin collar, and thereafter, in the same manner as in Examples 1 to 3, in each heat transfer tube, 9.25 mm from the flare portion forming side of the fin collar.
Pushing the φ plugs respectively, moving them downward in the axial direction of the heat transfer tube, which is the direction opposite to the extending direction of the fin collar, and fixing the heat transfer tubes to the plurality of plate fins respectively by expanding the tube. Thus, the intended fin coil heat exchanger was manufactured. And this was made into the comparative example 2.

Then, five of each of the two types of fin coil heat exchangers (Comparative Examples 1 and 2) were produced, and the number of fin pitch disturbances in each fin coil heat exchanger was measured. , I investigated by type. The results are shown in Table 1 below.

[0056]

[Table 1]

As shown in Table 1, in the fin coil type heat exchanger of Comparative Example 1 manufactured according to the conventional method, the fin pitch disorder is generated in all the manufactured ones, and The method of the present invention is manufactured by a method using aluminum plate fins that have the same expansion direction of the heat transfer tube (movement direction of the plug) with respect to the arrangement direction of the aluminum plate fins (extending direction of the fin collar), but have different shapes. In the fin coil type heat exchanger of Comparative Example 2, fin pitch disorder is apparently generated although the number is smaller than that of Comparative Example 1. On the other hand, in the fin coil type heat exchangers of Examples 1 to 3 manufactured according to the method of the present invention, no fin pitch disorder occurs. this is,
It is clearly shown that the adoption of the method of the present invention makes it possible to very effectively prevent the occurrence of fin pitch disturbance.

The tapered portion 22 and the flare portion 20 of the fin collar 18 obtained by molding in the same manner as described above.
The angle formed by the normal line at the contact point with and the central axis of the fin collar 18: the magnitude of β is 0 °, 2 °, 5 °, 10 °,
Alternatively, 240 pieces of each of the five types of plate fins 10 having the taper portion 22 having an inclination of 20 degrees are used, and each of them is directed downward as shown in FIG. 6 (a). The heat transfer tubes (9.52 mm) are stacked vertically in the assembly holes while extending upward from the flare portion side of the fin collar.
(Hair pin copper tube with inner groove of φ) is inserted coaxially with the fin collar, and then, in each heat transfer tube, from the side opposite to the flare portion forming side of the fin collar (from top to bottom in FIG. 6 (a)). To the same direction as the extending direction of the fin collar by pushing in the 9.25 mmφ plugs.
The heat transfer tubes were moved downward in the axial direction of the heat transfer tubes to expand and fix the heat transfer tubes to a plurality of plate fins, and thus various desired fin coil heat exchangers were produced.

Next, five each of the various kinds of the obtained fin coil type heat exchangers were manufactured, and the number of fin pitch disturbances in each of the fin coil type heat exchangers was examined by type. Is shown in Table 2 below.

[0060]

[Table 2]

As is apparent from the results of Table 2, according to the present invention, the tapered portion 22 is provided around the plate fin assembly hole, and the angle β between the normal line and the central axis of the fin collar is 0 degree. By setting the predetermined value larger than this, the desired fin coil type heat exchanger can be advantageously manufactured without causing fin pitch disturbance.

[0062]

As is apparent from the above description, according to the method for manufacturing a fin coil type heat exchanger according to the present invention, the burden on work and economy accompanying the addition of new processes and facilities is increased. It is possible to advantageously prevent the fin pitch from being disturbed when the heat transfer tube is fixed to the aluminum plate fin by expanding the heat transfer tube, and as a result, it has a good appearance and excellent heat exchange efficiency. The fin coil heat exchanger can be manufactured very advantageously.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional explanatory view of an essential part showing an example of an aluminum plate fin used when manufacturing a fin coil heat exchanger according to the present invention.

FIG. 2 is an explanatory view showing a step in the method for manufacturing the fin coil heat exchanger according to the present invention, showing a state in which the aluminum plate fins shown in FIG. 1 are vertically stacked.

FIG. 3 is an explanatory view showing another step in the method for manufacturing the fin coil heat exchanger according to the present invention, in which the heat transfer tubes are inserted into the respective assembly holes of the aluminum plate fins stacked on each other. Is shown.

FIG. 4 is an explanatory view showing still another step in the method for manufacturing the fin coil heat exchanger according to the present invention, in order to expand the heat transfer tube inserted into each assembly hole of the aluminum plate fin. , Shows a state in which a plug is pushed into the heat transfer tube.

FIG. 5 is a view corresponding to FIG. 1, showing another example of the aluminum plate fins used in manufacturing the fin-coil heat exchanger according to the present invention.

FIG. 6 is a partial explanatory view corresponding to FIG. 4 showing another method of manufacturing a fin coil type heat exchanger according to the present invention, in which (a) shows a case where the aluminum plate fin shown in FIG. 1 is used. 5B shows the case where the aluminum plate fin shown in FIG. 5 is used.

FIG. 7 is an enlarged cross-sectional explanatory view of a main part showing a state in which aluminum plate fins having different arrangement positions are arranged in a conventional fin coil heat exchanger,
(A) shows a state in which the fin pitch is normal, (b) shows a state in which the fin pitch is disturbed, and (c) shows that the fin pitch is normal, but This indicates a state in which an abnormality has occurred in the deformation direction.

[Explanation of symbols]

10, 30, 34 Aluminum plate fin 12 Plate fin body 14 Assembly hole 16 Heat transfer tube 18 Fin collar 20 Flare portion 22 Tapered portion 26 Insertion hole 28 Plug

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Takeshima 5-11-3 Shimbashi, Minato-ku, Tokyo Sumitomo Light Metal Industry Co., Ltd.

Claims (5)

[Claims] 1. A cylindrical fin collar is integrally provided around each of the assembly holes formed in the plate fin main body so as to extend integrally from the same side of the plate fin main body. Using a plurality of aluminum plate fins provided with a flare portion that is bent or curved outward in the radial direction, the plurality of assembling holes correspond to each other and the fin collars are the same. After stacking the plurality of aluminum plate fins so that they are located on the side, the heat transfer tube is inserted coaxially with the fin collar into the plurality of assembly holes, and then the plug is pushed into the heat transfer tube. By moving the heat transfer tube in the tube axis direction to expand the heat transfer tube, the heat transfer tube is integrated with the plurality of aluminum plate fins. When the fin-coil heat exchanger is manufactured by assembling the fin-coil heat exchanger, a part of the plate fin main body around the assembling hole is moved in a direction opposite to the fin collar forming side from the diameter of the assembling hole. An aluminum plate fin having a tapered portion having a gradually increasing diameter, an inclined surface or a curved surface is used, and a plurality of them are stacked on each other, and a tapered portion of the plate fin main body in one of the stacked ones, The fin collar of the other one is disposed so as to come into contact with the flare portion of the fin collar, and the plug is pushed into the heat transfer tube that is coaxially inserted into the fin collar to push the shaft of the heat transfer tube. A method for manufacturing a fin coil type heat exchanger, characterized in that the heat exchanger is moved in a direction. 2. When the plurality of aluminum plate fins are stacked on each other, a normal line at a contact point between one of the stacked plate fin main body taper portions and the other one of the fin collar flare portions, The angle formed with the central axis of the fin collar is 0
The method for manufacturing a finned coil heat exchanger according to claim 1, wherein an aluminum plate fin having the tapered portion is used so as to exceed 45 degrees and 45 degrees or less. 3. The plug according to claim 1, wherein the plug is pushed into the heat transfer tube inserted coaxially with the fin collar from the flare portion forming side of the fin collar. 2. The method for manufacturing the find coil heat exchanger according to 2. 4. The plug is pushed into a heat transfer tube inserted coaxially with the fin collar from a side opposite to the flare forming side of the fin collar. The method for manufacturing the fin coil type heat exchanger according to claim 1 or 2. 5. An aluminum plate fin used for a fin coil type heat exchanger, wherein a plurality of assembly holes are formed in the plate fin body,
Cylindrical fin collars are provided so as to extend integrally from the same surface side of the plate fin body, and are bent or curved outward in the radial direction at the tip end portions of the fin collars. A flare portion is further provided, and the peripheral portion of the assembly hole of the plate fin body is gradually inclined toward the direction opposite to the fin collar forming side to have a diameter larger than the diameter of the assembly hole. An aluminum plate fin configured as a tapered portion having a surface or curved surface form.