JPH10300381A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the dispersion of heat exchange power accompanying the inferiority of the positional dislocation of a slit, by sliding a plurality of slits standing in a line in the direction of a ridge out of slits, in the direction of development. SOLUTION: At an inner fin 22, a plurality of slits 22b are made side by side in the development direction X of the inner fin 22 and in the direction Y of the ridge orthogonal to the direction of development. Moreover, a plurality of slits 22b standing in a row in the ridge direction Y out of the slits 22b are slid by specified quantities with one another in development direction X. This can prevent the positional slippage having occurred first from affecting in a chain all bent crests made after that. Accordingly, this can lessen the dispersion of the average quantity of positional slippage of the inner fin 22, so this can suppress the dispersion of the heat exchange power of an inter cooler effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for cooling a supercharged air heated by, for example, a supercharger by exchanging heat with cooling air or cooling water, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, as the demand for higher output of automobiles has increased, the number of automobiles equipped with a supercharger has increased, and a heat exchanger (hereinafter, referred to as an intercooler) for cooling a high-temperature supercharged air has been increased. The number of vehicles installed is increasing. Under such circumstances, demands for higher performance of the intercooler, that is, higher heat radiation and lower pressure loss have been increasing along with the performance improvement of the supercharger.

It is known that the performance of the intercooler can be improved by means such as increasing the heat transfer area by inner fins disposed in a tube through which the supercharged air flows. However, depending on the shape of the inner fin, an increase in pressure loss in the tube is caused, and the amount of intake air supplied to the combustion chamber of the engine is reduced, thereby deteriorating the performance of the engine. Would.

Therefore, as a means for solving this problem,
For example, JP-A-3-45891 and JP-A-3-8
In Japanese Patent No. 4396, an inner fin is formed with a slit cut from a part of a bent valley of a bent mountain part bent to a rectangular wave shape to a part of a vertex of the bent mountain part.

[0005]

SUMMARY OF THE INVENTION Incidentally, the inventors of the present invention have attempted to mass-produce the inner fins described in the above-mentioned publication, after forming a slit in a thin fin material,
Without aligning the slit with respect to the bent mountain,
We tried to bend the fin material into a rectangular wave shape using a high-speed press molding machine, but the slit position was misaligned (slit position variation), which caused the slit position to be significantly shifted from the bent peak. . Then, the slit position misalignment causes variation in the heat exchange capacity of the intercooler.

According to the detailed examination and research conducted by the inventors, the positional deviation of the slit has almost no effect on the heat transfer coefficient, but the ventilation resistance of the supercharged air when passing through the inner fin is reduced by up to 16 times. It has been confirmed that the percentage increases.
Therefore, the fin material having the slit is continuously bent into a rectangular wave shape using a roller forming machine having a gear-shaped roller, and one of the slits formed in the longitudinal direction of the fin material is formed. A pilot hole was used as a pilot hole, and a pilot pin provided on the outer periphery of the roller was fitted into the pilot hole to try to align the slit with the bent crest.

However, the thickness of the fin material is small (0.0
8 mm), the edge of the pilot hole was pulled by the pilot pin and a crack was formed around the pilot hole, so that the position of the slit could not be adjusted with respect to the bent crest. Incidentally, it is conceivable to adjust the position of the slit each time one bent mountain portion is formed in order to cope with these slit position shift defects. However, since this method significantly reduces the mass productivity, the production of the inner fin is difficult. The cost rises, which in turn causes an increase in the manufacturing cost of the intercooler.

In view of the above, the present invention improves the mass productivity of the inner fins by manufacturing the inner fins without adjusting the positions of the slits with respect to the bent ridges, and also improves the heat exchange due to the poor slit position misalignment. The purpose is to suppress variations in performance.

[0009]

The present invention uses the following technical means to achieve the above object. According to the first or second aspect of the present invention, among the slits (22b), the plurality of slits (22b) arranged in the ridge direction (Y) are:
It is characterized in that they are shifted from each other in the developing direction (X).

Thus, if one slit (22)
As described later, even if a positional shift occurs between the bent mountain part (22a) and the bent mountain part (22a), the bent mountain part (22a) excluding the bent mountain part (22a) where the positional shift has occurred occurs. It is possible to prevent the influence of the displacement from being chained. Therefore, the inner fin can be manufactured without performing alignment of the slit (22b) with respect to the bent crest (22a), and variation in the heat exchange capacity due to a poor slit position shift can be suppressed.

The amount of displacement between the plurality of slits (22b) arranged in the ridge direction (Y) is the same as in the second aspect of the invention.
And the other end side slit (22b)
It is desirable to set such that the dimension (b) is shifted by a dimension (D) parallel to the developing direction (X). In addition, the code | symbol in the parenthesis of each said means shows the correspondence with the concrete means of embodiment mentioned later.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; In this embodiment, the heat exchanger according to the present invention is applied to an intercooler, and FIG. 1 is a perspective view of the intercooler 1. Reference numeral 2 denotes a flat tube (hereinafter abbreviated as a tube) made of an aluminum alloy through which air pressurized by a compressor (not shown) (hereinafter, referred to as supercharged air) flows.
Is formed by brazing a plate (plate) 21 press-formed into a predetermined shape, as shown in FIG. As shown in FIGS. 1 and 2, heat between the air (second fluid) and the supercharged air (first fluid) flowing from a direction substantially perpendicular to the longitudinal direction of the tubes 2 is provided between the tubes 2. An aluminum outer fin 3 formed in a corrugated (corrugated) shape for facilitating replacement is provided, and the outer fin 3 is a plate 2 constituting the tube 2.
1 and brazed together.

On the other hand, as shown in FIG. 2, an inner fin 22 for promoting heat exchange of the supercharged air is provided in each tube 2, and this inner fin 22 is provided as shown in FIG. , A plurality of rectangular bent ridges (hereinafter abbreviated as bent ridges) 22a are formed in a rectangular corrugated shape. In the inner fin 22, a plurality of slits (notches) 22b penetrating in the thickness direction of the inner fin 22 are formed side by side in the developing direction X of the inner fin 22 and the ridge direction Y orthogonal to the developing direction. ing.

The plurality of slits 22b arranged in the ridge direction Y among the slits 22b are shifted from each other by a predetermined amount in the developing direction X. In the present embodiment, the deviation amount δ is such that, of the plurality of slits 22b arranged in the ridge direction Y, the slit 22b on one end side of the ridge direction Y and the slit 22b on the other end side have a substantially slit dimension D ( (See FIG. 4), a value obtained by dividing the slit dimension D by a value obtained by subtracting 1 from the number N of the slits 22b arranged in the ridge direction Y (δ = D /
(N-1)).

Here, as shown in FIG. 4, the slit dimension D refers to the dimension of the slit 22b that is parallel to the developing direction X. Incidentally, in the present embodiment, the slit dimension D is equal to the developed length L of the bent ridge 22a (the expanded dimension from the center of the valley 22c of the bent ridge 22a to the center of the adjacent valley 22c ((b in FIG. 3)). See))).

In FIG. 1, reference numeral 4 denotes an inlet into which the supercharged air flows, and reference numeral 5 denotes an outlet through which the supercharged air cooled by the intercooler 1 flows out. Reference numeral 6 denotes a distribution tank for distributing the supercharged air flowing from the inflow port 4 to each tube 2, and reference numeral 7 denotes a collecting tank for collecting the supercharged air flowing through each tube 2. Next, a method for manufacturing the inner fins 22 of the intercooler 1 according to the present embodiment will be described.

FIG. 5 is a schematic view of a fin manufacturing apparatus 100 for manufacturing the inner fin 22. The fin manufacturing apparatus 100 includes a press forming apparatus section 110 for performing a pressing process.
And a roller forming device section 120 that performs a roller forming step;
It is composed of a feeder unit 130 and a friction brake unit 140 that perform a contraction process. The press forming device 110 includes a movable mold 111 movable in a direction perpendicular to the longitudinal direction (feed direction) of the thin fin material 50, and a fixed mold 112 fixed to the press forming device 110. A plurality of slits 22b are simultaneously formed such that the plurality of slits 22b arranged in the ridge direction Y are shifted from each other by a predetermined amount in the developing direction X.

The roller forming device section 120 has a pair of gear-shaped rollers 121 and 122, and bends the fin material 50 having the slit 22b formed after the pressing step to form a rectangular corrugated shape. Feed unit 1
Reference numeral 30 denotes a pair of gear-shaped rollers 131 and 132. In the roller forming device section 120, no special means for adjusting the position of the slit 22b with respect to the bent ridge section 22a by means of a pilot pin or the like is employed, and the roller forming apparatus section 120 is linked to the feed speed of the feed device section 130. Thus, the bent mountain portion 22a is sequentially formed.

Further, the friction brake section 140 is sent out from the feeder section 130 after the roller forming step by pressing the metal brake member 141 to the vertex side of the bent ridge 22a by a spring means 142 or the like. By applying a braking force to the fin material 50, each bent mountain portion 22a
The fin material 50 is shrunk so that the distance between them becomes a predetermined value.

Next, the features of this embodiment will be described. By the way, temporarily, a plurality of slits 22b arranged in the ridge direction Y
However, when the positions are not shifted from each other in the developing direction X and are aligned on the same line, the position of the slit 22b with respect to the bent crest 22a formed first in the roller forming process is shifted from a predetermined position. The position shift that occurs first affects all bent ridges 22a formed thereafter.

On the other hand, in the present embodiment, as described above, the plurality of slits 22b arranged in the ridge direction Y
Since the slits 22b are formed so as to be displaced from each other in the developing direction X, it is possible to prevent the positional deviation that has occurred first from affecting the bent ridges 22a that are formed subsequently in a chained manner. be able to. In other words, even if a positional shift occurs with respect to the firstly formed bent ridge 22a, a predetermined period (a predetermined number of bent ridges 2a) is not applied.
For each 2a), it is possible to generate a state in which the slit 22b is at a predetermined position with respect to the bent crest 22a and has no positional deviation.

Accordingly, when observing the relationship between the individual bent ridges 22a and the slits 22b, different positional deviations have occurred, but a state where there is no positional deviation (a state where the positional deviation amounts are equal) is periodically changed. Can be generated. That is, variation in the average positional deviation amount of the inner fins 22 can be reduced, so that variation in the heat exchange capacity of the intercooler 1 can be effectively suppressed.

In the above-described embodiment, the slit dimension D is half of the developed length L of the bent crest 22a. However, the present invention is not limited to this. It may be a real number multiple of the length L. By the way,
FIG. 6 is a perspective view of the inner fin 22 when the slit dimension D is equal to the developed length L. Further, as shown in FIG. 7, two slits 22b shifted in a staggered manner may be set as one set, and the slits 22b may be shifted in the developing direction X. FIG. 8 shows the inner fin 22 shown in FIG.
FIG.

In the above embodiment, the slit 22
Although the shape of b is rectangular, it may be elliptical or elliptical. Further, the heat exchanger according to the present invention can be applied not only to an intercooler but also to other heat exchangers such as an oil cooler.

[Brief description of the drawings]

FIG. 1 is a perspective view of an intercooler.

FIG. 2 is a sectional view of a flat tube.

FIG. 3A is a perspective view of an inner fin,
(B) is a side view of the inner fin.

FIG. 4 is a development view of an inner fin (fin material).

FIG. 5 is a schematic diagram of a fin manufacturing apparatus.

FIG. 6 is a perspective view of an inner fin according to a modification of the present invention.

FIG. 7 is a perspective view of an inner fin according to a modification of the present invention.

8 is an inner fin (fin material) shown in FIG. 7;
FIG.

[Explanation of symbols]

2. Flat tube, 22 inner fin, 22a bent ridge, 22b slit.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hideyuki Ota 1-1-1, Showa-cho, Kariya-shi, Aichi Pref.

Claims (3)

[Claims] 1. A tube (2) through which a first fluid flows, and a corrugated inner fin (22) disposed in the tube (2) and having a plurality of bent ridges (22a) formed therein. A heat exchanger (1) for exchanging heat between the first fluid and a second fluid flowing outside the tube (2), wherein the inner fin (22) Are a plurality of slits (22) penetrating in the thickness direction of the inner fin (22).
b) are formed in a developing direction (X) of the inner fin (22) and a ridge direction (Y) orthogonal to the developing direction (X), and the ridge direction (Y) of the slit (22b) is formed. ), The plurality of slits (22b) arranged in the direction (X) are shifted from each other in the development direction (X). 2. A plurality of slits (22b) arranged in the ridge direction (Y), the slit (22b) on one end side and the slit (22b) on the other end side in the ridge direction (Y). 2. The heat exchanger according to claim 1, wherein the slits are shifted by a dimension (D) parallel to the development direction (X) among dimensions of the slit (22b). 3. 3. The method for producing an inner fin of a heat exchanger according to claim 1, wherein the plurality of slits (22b) are formed in a thin fin material.
And a roller forming step of continuously forming the bent ridges (22a) by inserting the thin plate after the pressing step between a pair of gear-shaped rollers. A method for producing an inner fin of a heat exchanger.