JPH0769116B2 - Fin for heat exchanger and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger fin and a method for manufacturing the same, and more particularly, to a plurality of through holes formed in a row at a constant interval in the longitudinal direction of an elongated metal plate. The heat exchange is formed by forming one or more rows of through holes in the width direction of the metal body, and each of the through holes is a colored through hole whose peripheral edge is substantially surrounded by a collar of a predetermined height. TECHNICAL FIELD The present invention relates to a dexterous fin and a manufacturing method thereof.

[0002]

2. Description of the Related Art In a heat radiating portion of a heat exchanger such as an automobile cooler or a room cooler, a plurality of through holes with collars having predetermined heights are provided on a metal plate body such as an elongated rectangular aluminum thin plate. Fins are used. In the heat radiating portion of the heat exchanger composed of such cooling fins, a plurality of cooling fins are polymerized by matching each of the colored through holes of each cooling fin, and the thermal conductivity of copper or the like is spread across these through holes. A conduit of tall metal is inserted and integrated. Such heat exchanger fins, drawing method, or JP-B-54
Manufactured by ironing method proposed in over 31,754 and JP 3 over 128,131 discloses the like.

As shown in FIG. 3 (A), a drawing method is as follows. First, a truncated cone or columnar shallow container having a bottom surface having a diameter larger than the opening diameter of the through hole with collar formed in the metal plate body 100. After forming the portion 106 [(b) step], the drawing process is performed to gradually increase the diameter of the shallow container section 106 while reducing the diameter [(b) (c) (d) step]. Next, the container portion 109 having a predetermined height is subjected to a drilling process and a burring process (step (e)), and further the tip of the collar 104 is bent to form the collar 105 (step (f)). .

In the ironing method, as shown in FIG. 3 (B), first, the metal plate body 100 is perforated and burred, and the perforated hole 101 is surrounded by the projecting piece 102. Is formed [step (a)], and then the projecting piece is extended while "ironing" while enlarging the hole diameter of the drilled hole 101, and ironing is performed to form the collar 104 of a predetermined height [(b ) (C) Step]. After that, the collar 104 having a predetermined height is bent at its tip to form the collar 105 [step (d)].

Since such drawing or ironing is usually performed on a wide elongated metal plate, a plurality of through holes with collars are formed on the elongated metal plate after processing. A plurality of rows of through holes with collars, which are arranged in a row at regular intervals in the longitudinal direction of the body, are formed in the width direction of the elongated metal plate body. For this reason, the wide elongated metal plate body after processing is cut between the through-hole rows with collars so that the through-hole rows with collars are arranged in one or more rows in the width direction so as to fit the heat exchanger to be manufactured. It is cut into an elongated rectangular metal plate body.

[0005]

The above-mentioned drawing method is
Processing strain is easily accumulated in the metal plate body because the metal plate body is subjected to drawing processing several times, and when the long metal plate body is cut into an elongated rectangular shape after the processing, the processing strain appears. A corrugation phenomenon in which a slender rectangular metal plate body corrugates in an uneven shape is likely to occur. A heat exchanger using fins for a heat exchanger made of a metal plate body in which such a wavy phenomenon is generated has a heat exchange rate higher than that of a heat exchanger using fins for a heat exchanger made of a flat metal plate body. Efficiency may be reduced. Therefore, the heat exchange efficiency of the heat exchanger may be lower than the designed heat exchange efficiency. On the other hand, in the ironing method, since the protruding pieces of the small holes that have been drilled are ironed, the processing strain accumulated in the metal plate body is greater than the drawing process in which the metal plate body is drawn several times. Can be reduced.

However, in recent years, from the viewpoint of reducing the weight of the heat exchanger and the like, the thinning of the metal plate body forming the cooling fins is progressing, so that the strength of the metal plate body is becoming a problem. Therefore, if the hardness of the metal plate body is increased in order to reinforce the strength of the metal plate body, the workability also deteriorates in the drawing method and the ironing method. In particular, in the ironing method, the maximum ironing amount decreases as the hardness of the metal plate body increases, so in order to produce a collar of a predetermined height, under the processing conditions where the ironing amount near the maximum ironing amount is obtained. Ironing is required, and the workability is significantly reduced. Furthermore,
Recently, in order to improve heat exchange performance, slits, louvers, etc. are formed by pressing in the gaps between the through holes with collars. It has started to accumulate.
Then, the objective of this invention is the fin for heat exchangers which can absorb the processing strain accumulate | stored in a metal plate body, and can hold | maintain the strength of a metal plate body, without making a metal plate high hardness, and its manufacturing method. To provide.

[0007]

Means for Solving the Problems As a result of repeated studies to achieve the above object, the present inventor has obtained an elongated rectangular metal plate obtained by cutting between the through-hole rows with collars of a long metal plate. The grooves are intermittently pressed between the through holes with collars of the elongated metal plate so that the grooves are formed intermittently along the through holes with collars near both ends of the body. The present invention has been found to be able to sufficiently absorb the processing strain accumulated in the metal plate body, and to improve the strength of the elongated rectangular metal plate body when it is formed.

That is , according to the present invention, an elongated metal plate body is drilled.
The perimeter of the through hole provided is substantially made up of a collar of a predetermined height.
A plurality of colored through holes surrounded by
In the heat exchanger fins arranged at regular intervals in the hand direction, in the vicinity of each edge along the longitudinal direction of the metal plate body
In addition, the heat exchanger fin is characterized in that the groove and / or the projection is formed intermittently in the longitudinal direction of the metal plate body .

Further, according to the present invention, a long metal plate body is drawn.
The perimeter of the perforated hole that has been drilled or ironed is predetermined
Colored through hole substantially surrounded by height collar
Place a plurality of the metal strips at regular intervals in the longitudinal direction of the long metal plate.
The elongated through holes with colored holes arranged in a line
After forming a plurality of rows in the width direction of the body with a predetermined interval,
Long metal obtained by cutting a long metal plate to a predetermined width
The through holes with collars are arranged in the longitudinal direction of the plate body.
When manufacturing fins for heat exchangers ,
Between the formed through-hole rows with collars, the through-hole rows with collars
After intermittently forming grooves and / or ridges along the
A slender metal plate that is cut near the groove and / or the ridge
Grooves and / or ridges are formed near each edge along the longitudinal direction of the body.
Portions are formed intermittently in the longitudinal direction of the elongated metal plate body.
It is also a method of manufacturing a fin for a heat exchanger, characterized in that a fin for a heat exchanger is obtained . In the present invention, the " periphery of the through hole is substantially surrounded by a collar having a predetermined height.
The term " collared through hole " means not only a colored through hole in which the entire peripheral edge of the through hole is surrounded by a collar, but also a colored through hole in which a notch is provided in a part of the collar surrounding the peripheral edge. Is also included.

[0010]

According to the present invention, a long metal plate is provided with a collar.
Processing strain accumulated in the metal plate due to the formation of through holes
The groove and / or ridge between the colored through-hole rows.
Suction is performed by forming intermittently along the row of through holes
Can be stored. Further, the obtained heat exchanger fins are formed.
An elongated metal plate is provided near each edge along the longitudinal direction.
Grooves formed intermittently in the longitudinal direction of the metal plate and / or
The convex portion can also reinforce the strength of the metal plate body . For this reason, the long metal plate is thinned and the hardness is increased.
Even if the workability deteriorates, the processing conditions can be relaxed and avoided.
It Moreover, relaxation of processing conditions and absorption of processing strain are combined.
A groove and / or a ridge formed on the elongated metal plate.
Cut the vicinity of the and attach a collar in the longitudinal direction of the elongated metal plate
Through holes are arranged, and along the longitudinal direction of the elongated metal plate.
A metal plate whose groove and / or ridge is elongated near each edge
A heat exchanger fin formed intermittently in the longitudinal direction of the body;
Even if the processing strain is released, the metal plate body
Waving to the current can be prevented the phenomenon, it is possible to obtain a flat have elongated metal plate body.

[0011]

The present invention will be described in more detail with reference to the drawings. FIG. 1 is a partial plan view showing an embodiment of a heat exchanger fin of the present invention. In this heat exchanger fin, a plurality of collared through holes 12 are formed in a row in the longitudinal direction of the elongated metal plate body 10 at regular intervals. In order to improve the heat exchange efficiency, as shown in FIG. 2 which is a sectional view taken along the line AA of FIG. ... are formed. In addition, in the through hole 12 with a collar, a collar 17 surrounding the periphery of the circular through hole 16 is formed perpendicularly to the metal plate body 10.
A flange-shaped flange portion 14 is formed at the tip of 7.
In the fin for heat exchanger of this embodiment, the metal plate body 10 is used.
The groove portions 20 ... Are intermittently formed near the both side ends of the metal plate body 10.
Is formed in the longitudinal direction.

The heat exchanger fin of this embodiment shown in FIGS. 1 and 2 is formed by the ironing method described in JP-A-3-128131, and is a wide elongated metal plate. A plurality of colored through-hole rows, each of which includes a plurality of colored through-holes 12 formed in a row with a predetermined gap in the longitudinal direction of the body, are formed in the width direction of the elongated metal body. This ironing method is a long metal plate body,
After forming a small hole having a diameter smaller than that of the through hole 12 with a collar to be formed, a punch having an outer diameter equal to the opening diameter of the through hole 12 with a collar and an inner diameter equal to the outer diameter of the collar 17 of the through hole 12 are formed. A die is used to expand the diameter of the small holes and subject the protruding pieces at the peripheral edge of the small holes to ironing to form a collar having a predetermined height. Further, in this embodiment, slits 18, 18 ... Which are vertically raised or lowered are formed in the gaps between the through holes 12 with collars. After that, when the elongated metal plate body is cut between the rows of through holes with collars to form the elongated metal plate body 10, a cross-sectional shape is formed in the vicinity of both side ends of the metal plate body 10 that sandwiches the slits 18, 18 ... Are formed along the longitudinal direction of the metal plate body 10, so that the groove portions 20 ... Are formed between the rows of through holes with collars of the elongated metal plate body by press working. To do.

Since the groove portions 20 ... Are intermittently formed along the row of through holes with collars, the groove portions 20.
.. Since the peripheral edge portion of .. is drawn in the direction of the groove portion 20 ..
When forming, the processing strain accumulated in the metal plate body 10 can be absorbed. Also, the groove portion 20
.. can reinforce the strength of the elongated metal plate body 10. Therefore, even if the metal plate body 10 is thinned,
The strength can be increased without increasing the hardness of the metal plate body 10.

By the way, if the groove portion is a continuous groove portion formed continuously along the row of through holes with collars, the strength of the metal plate member 10 can be reinforced, but the processing strain can be sufficiently absorbed. However, when the elongated metal plate body 10 is cut from the long metal plate body, a corrugation phenomenon appears.
The reason is that when forming the continuous groove portion, it is possible to absorb the processing strain in the direction perpendicular to the continuous groove portion, but it is not possible to absorb the processing strain in the direction parallel to the continuous groove portion. It is presumed that.

In the embodiment described above, the slits 18, 18, ... Are provided in the gaps between the through holes 12 with collars.
Is formed, but a louver may be formed, or a structure such as a slit or a louver for improving heat exchange performance may not be formed. Further, in the present embodiment, the groove portions 20 ... Are intermittently formed near the side end portion of the metal plate body 10, but the ridge portions may be intermittently formed, or slits, louvers, or the like. In order to efficiently flow the air, the metal plate body 10
The groove portion may be formed intermittently on one side of the side end portion, and the ridge portion may be formed intermittently on the other side end portion. Further, in the present embodiment, the row of through holes with collars formed in the elongated metal plate body 10 is one row, but a plurality of rows of through holes with collars are formed in the width direction of the metal plate body 10. Good. In this case, grooves and / or ridges may be formed intermittently on both sides of each colored through hole array, or the elongated metal plate 1
The groove portions and / or the ridge portions may be intermittently formed only in the vicinity of both side end portions of 0. In addition, the through holes with collars in this embodiment are formed by ironing.
It may be formed by the drawing process shown in (A).

[0016]

According to the present invention, even if the metal plate body is thinned, the flat heat exchange fins can be easily manufactured by drawing or ironing. For this reason, it has become possible to meet the demands for weight reduction of the heat exchanger such as a room cooler finally obtained and ensuring design heat exchange efficiency.

[Brief description of drawings]

FIG. 1 is a partial plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is an explanatory diagram illustrating a drawing process and an ironing process.

[Explanation of symbols]

 10 Metal Plate 12 Through Hole with Collar 16 Through Hole 17 Color 20 Groove

Claims (2)

[Claims] 1. A peripheral edge of a through hole formed in an elongated metal plate body.
Is a color that is substantially surrounded by a collar of a certain height.
A plurality of through holes with holes are spaced at regular intervals in the longitudinal direction of the metal plate.
A fin for a heat exchanger arranged with a groove portion and / or a groove portion near each edge along the longitudinal direction of the metal plate body.
Alternatively, the fin for heat exchanger is characterized in that the ridges are formed intermittently in the longitudinal direction of the metal plate body . 2. A long metal plate is drawn or ironed.
By applying the work, the perimeter of the drilled through hole becomes a collar with a predetermined height.
Therefore, a plurality of colored through holes that are substantially surrounded are elongated.
The metal plates are arranged in a row at regular intervals in the longitudinal direction.
A row of through holes with collars in the width direction of the long metal plate.
After forming a plurality of rows at regular intervals, the elongated metal plate body is cut into a predetermined width to obtain a long thin strip.
The through holes with collars are arranged in the longitudinal direction of the metal plate.
When manufacturing the heat exchanger fins consisting of, between the row of through holes with collars formed in the elongated metal plate,
Intermittent grooves and / or ridges along the row of through holes with collars
Of the elongated metal after cutting the groove and / or the ridge near the groove.
Grooves and / or protrusions near each edge along the longitudinal direction of the plate.
Striations are formed intermittently in the longitudinal direction of the elongated metal plate body.
A method for manufacturing a fin for a heat exchanger, characterized in that a fin for a heat exchanger is obtained .