JP2009030863A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of ensuring a radiation effect by reducing a pressure loss regardless of an operation status, that is, regardless of a low speed and a high speed. <P>SOLUTION: In this heat exchanger 1 where tubes 2 are put on a face surrounded by an outer frame member, a fin 3 for improving heat diffusing performance is disposed between the tubes 2 in zigzag, and a plurality of louvers 4 are formed in a cut and raised state along the width direction of the fins 3 between the tubes 2, the louvers 4 having widths narrower than those of the louvers 4 formed at other parts are formed in proper parts out of the louvers 4 forming the front side and the back side of an airflow flowing in the width direction of the fin 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat exchanger that reduces pressure loss and secures a heat dissipation effect regardless of operating conditions, that is, at low speeds and high speeds.

Conventionally, as a heat exchanger, the core of the radiator has a tube surrounded by an outer frame member, and a tube through which cooling water heated by the engine flows is stretched to improve heat dissipation on the outer periphery of the tube. There is a so-called corrugated fin type in which fins are arranged in a meandering manner.
A large number of louvers having a predetermined width are cut and formed on the surfaces of these fins in the air flow direction, and an air flow is passed between the louvers so as to ensure a heat radiation effect.

However, this heat dissipation effect attenuates from the inflow side to the outflow side of the airflow.
For example, in a thick radiator, the rear air temperature rises greatly in the air flow direction, and the temperature difference between the air and the fin is reduced. Therefore, the rear louver does not contribute to the heat dissipation effect.
On the other hand, in thin radiators, the heat dissipation effect can be enhanced by densifying the louver. However, in the thick radiator described above, the increase in heat dissipation is small, but the pressure loss increases when air passes through. It is difficult to improve the actual vehicle performance Qv.

  In order to increase the heat dissipation effect of the radiator as described above, as shown in Patent Document 1, the pitch (width dimension) of the rear louver is increased (larger) in order to reduce the pressure loss in the rear louver. Alternatively, measures such as laying down the angle (cutting and raising the angle) are taken to improve the actual vehicle performance Qv.

JP 2003-83690 A

However, the benchmark result of the product by this method was able to see the improvement of the actual vehicle performance Qv, which was the initial target in the low speed condition. However, in the high speed condition, the heat radiation amount was reduced and the actual vehicle performance Qv was reduced. A decrease was seen.
The present invention has been proposed to improve the above problems, and proposes a heat exchanger that reduces pressure loss and secures a heat dissipation effect regardless of operating conditions, that is, at low speed and high speed. The purpose is to do.

In order to improve the above-mentioned problem, the invention described in claim 1 is characterized in that fins (3) for improving heat dissipation are arranged in a meandering manner between tubes (2) stretched over one surface. In the heat exchanger (1) formed by cutting and forming a plurality of louvers (4) along the fin (3) width direction,
Of the louvers (4) in the fin (3), a louver (4) having a narrower width than that of the louvers (4) formed in other portions is formed at an appropriate position.
By making the width dimension of the louver (4) narrower than the predetermined value, air flows between the louvers (4) at high speed, and both heat dissipation and pressure loss increase, but at low speed. Then, air does not flow between the louvers (4), and both heat radiation performance and pressure loss are reduced.
By utilizing such characteristics, the heat dissipation effect is secured at both low speed and high speed, and the actual vehicle performance is improved.

Further, in the invention according to claim 2, in the fins (3) adjacent to each other among the fins (3), the louver (4) formed on the rear side in the width direction of one fin (3) is provided in another part. Compared to the louver (4) formed in the above, the louver (4) has a narrower width.
Thereby, at low speed, air does not pass between narrow louvers (4) on the rear side of one fin (3), and pressure loss is reduced.
On the other hand, at the time of high speed, air flows between such narrow louvers (4), thereby ensuring a heat dissipation effect.

In the invention according to claim 3, the louver (4) formed on the rear side in the width direction of the fin (3) of the fin (3) is partly formed in the louver (4) formed in another part. In comparison, a narrow louver (4) is used.
Thereby, at low speed, air does not pass between narrow louvers (4) on the rear side of the fin (3), and pressure loss is reduced.
On the other hand, at the time of high speed, air flows between such narrow louvers (4), thereby ensuring a heat dissipation effect.

According to a fourth aspect of the present invention, in the fins (3) adjacent to each other among the fins (3), the louver (4) formed on one fin (3) is formed on the other fin (3). Compared to the louver (4), the louver (4) has a narrower width.
Thereby, at the time of low speed, the fin (3) which formed the narrow louver (4) does not pass air, and pressure loss is reduced.
On the other hand, at the time of high speed, the heat dissipation effect can be ensured by air flowing over the entire fin (3) in which such a narrow louver (4) is formed.

Further, in the invention according to claim 5, the louver (4) formed on the rear side of the fin (3) is narrower than the louver (4) formed on the front side. It is the structure which forms.
Thereby, at the time of low speed, the fin (3) in which the narrow louver (4) is formed, the air does not pass through the rear side, and the pressure loss is reduced.
On the other hand, at the time of high speed, a heat radiation effect can be ensured by air flowing also on the rear side where such a narrow louver (4) is formed.

  In addition, the code | symbol in the bracket | parenthesis of each said means is an example which shows a corresponding relationship with the specific means of embodiment mentioned later.

FIG. 1 schematically shows a main part of a heat exchanger 1 according to the present invention. The heat exchanger 1 is a radiator mounted on a vehicle, and the overall configuration is such that a plurality of tubes 2 (not shown) are stretched around one surface surrounded by an outer frame member, and the heat dissipating property is provided between these tubes 2. The fins 3 are arranged in a meandering manner for improving the above. In FIG. 1, only a part thereof is shown in an enlarged manner.
In this case, the heat exchanger 1 (hereinafter referred to as the radiator 1) includes fins 3 arranged in a meandering manner between the tubes 2 through which the fluid to be cooled from the vehicle flows, and a plurality of fins 3 are arranged along the fin 3 width direction. The louver 4 is cut and formed.
With such a configuration, the air introduced by the vehicle travels along the fin 3 width direction between the tubes 2 as indicated by the arrows, so that the louvers 4 formed along the fin 3 width direction. To improve heat dissipation.

Therefore, the louver 4 formed along the fin 3 width direction will be described in more detail.
A plurality of louvers 4 are formed along the width direction of the fin 3 by cutting and raising a predetermined width (referred to as a louver pitch Lp) and an appropriate angle. For example, the front side in the width direction of the fin 3 into which the air flows is cut and raised with an appropriate elevation angle so that the air can easily enter. And the width direction rear side of the fin 3 is cut and raised so as to form a depression angle toward the front side with the width direction middle of the fin 3 as a boundary.
Note that the effective flow of air between the louvers 4 is an important factor for effective thermal diffusion. Therefore, if the louver 4 has a constant cut-up angle, the inflowing air And the louver pitch Lp.
That is, here, by making the width dimension of the louver 4 narrower than a predetermined value, air flows between the louvers 4 at high speed, and both heat dissipation and pressure loss increase, but at low speed. In addition, air does not flow between the louvers 4, and both heat dissipation performance and pressure loss are reduced.
By utilizing such characteristics, the heat dissipation effect is ensured at both low speed and high speed, and the actual vehicle performance is improved.

  Therefore, in the present invention, the louver 4 is cut and raised as follows. Here, it is assumed that the velocity condition of the inflowing air is given. As the air speed conditions in this case, for example, a case is assumed where 4 m / s and 40 L / min are given under the low speed condition, and 8 m / s and 100 L / min are given under the high speed condition.

(First embodiment)
For example, in FIG. 2, in the fins 3 adjacent to each other among the fins 3, the louver 4n formed on the rear side of one fin 3 is narrower than the louver 4w formed on the other part. The configuration is as follows.
In this case, for example, a louver pitch Lp = 0.7 is used for the louver 4w in the width direction front side of the fin 3, that is, the left half louver 4w in the figure. As the louver 4n on the side, for example, a louver pitch Lp = 0.5 is used.

  In the radiator 1 having such a configuration, as shown in the drawing, at low speeds (for example, 4 m / s, 40 L / min), the louver 4w (Lp = 0.7) group on the front side of the fin 3 passes between the groups, On the rear side of the fin 3, air does not pass between the narrow louvers 4n (Lp = 0.5). Therefore, as shown by the dotted line, air flows and the pressure loss is reduced.

  On the other hand, at high speeds (for example, 8 m / s, 100 L / min), not only between the wider louver 4w (Lp = 0.7) group but also between the narrower louvers 4n (Lp = 0.5). When the air flows, the air flows through a route as shown by a solid line, and a heat dissipation effect can be secured.

(Second Embodiment)
In the radiator 1 of the present invention, the arrangement configuration of the louvers 4 in the fins 3 can be as shown in FIG.
In the arrangement configuration of the louver 4 in this case, the louver 4 formed on the rear side of the fin 3 out of the fins 3 is partially compared with the louver 4w (for example, Lp = 0.7) formed in another part. The narrow louver 4n (for example, Lp = 0.5).

  With such a configuration, as shown in the drawing, at the time of low speed, the louver 4w (Lp = 0.7) group on the front side of the fin 3 passes, and the rear side of the fin 3 has a narrow louver 4n ( Passing between the wide louver 4w (Lp = 0.7) groups, avoiding between Lp = 0.5). Therefore, as shown by the dotted line, air flows and the pressure loss is reduced.

  On the other hand, at high speed, air flows not only between the wider louver 4w (Lp = 0.7) group but also between the narrower louvers 4n (Lp = 0.5) on the rear side of the fin 3. The air flows through a route as shown by the solid line, and the heat dissipation effect can be secured.

(Third embodiment)
In the radiator 1 of the present invention, the arrangement configuration of the louvers 4 in the fins 3 can be as shown in FIG.
In the arrangement configuration of the louvers 4 in this case, in the fins 3 adjacent to each other, the louver 4 formed on one fin 3 is compared with the louver 4w (for example, Lp = 0.7) formed on the other fin 3. A narrow louver 4n (for example, Lp = 0.5) can be used.

  With such a configuration, as shown in the drawing, at low speed, the louver 4w having a wide width (Lp = 0.7) is passed between the louver 4 groups on the front side and the rear side of the fin 3, and the width of the louver 4w is increased. The narrow louver 4n (Lp = 0.5) is formed, the fin 3 side does not pass, air flows as shown by the dotted line, and the pressure loss is reduced.

  On the other hand, at high speed, air flows not only between the wider louver 4w (Lp = 0.7) group but also on the fin 3 side where the narrow louver 4n (Lp = 0.5) is formed. The air flows through a route as shown in FIG.

(Fourth embodiment)
Furthermore, in the radiator 1 of the present invention, the arrangement configuration of the louvers 4 in the fins 3 can be as shown in FIG.
In this case, the louver 4 formed on the rear side of the fin 3 is formed with a louver 4n (Lp = 0.5) that is narrower than the louver 4w (Lp = 0.7) formed on the front side. It is configured to do.

By adopting such a configuration, at the time of low speed, air does not pass through the rear side of the fin 3 forming the narrow louver 4n, as indicated by a dotted line, and pressure loss is reduced.
On the other hand, at the time of high speed, air also flows through the rear portion side where such a narrow louver 4n is formed, so that air flows through a route as shown by a solid line and a heat dissipation effect can be ensured.

As described above, in the present invention, by making the width dimension of the louver 4 narrower than a predetermined value, air flows between the louvers 4 at high speed, and air flows between the louvers 4 at low speed. As a result, in consideration of pressure loss and the like, it is possible to secure a heat dissipation effect at both low speed and high speed and to improve actual vehicle performance.
Here, comparing the effects of the heat dissipation amount Qw, pressure loss Dpa, and actual vehicle performance Qv according to the first to fourth embodiments described above, as shown in FIG. 6, the heat dissipation effect is generally secured at both low speed and high speed. In addition, the actual vehicle performance can be improved, and it can be said that the first and second embodiments exhibit particularly preferable effects.

It is a typical perspective view of the principal part of the heat exchanger concerning this invention. FIG. 2 is a cross-sectional view taken along line AA of the fin in the first embodiment of the heat exchanger shown in FIG. 1. It is a cut sectional view which cut along the AA line of the fin in a 2nd embodiment of a heat exchanger shown in Drawing 1. It is a cut sectional view which cut along the AA line of the fin in a 3rd embodiment of the heat exchanger shown in Drawing 1. It is a cut sectional view which cut along the AA line of the fin in a 4th embodiment of the heat exchanger shown in FIG. It is the table | surface which showed the parameter | index of the thermal radiation amount by the 1st-4th embodiment of a heat exchanger concerning this invention, a pressure loss, and a real vehicle performance.

Explanation of symbols

1 heat exchanger 2 tube 3 fin 4 louver

Claims (5)

Fins (3) for improving heat dissipation are arranged in a meandering manner between the tubes (2) stretched over the entire surface, and a plurality of louvers (4) are cut along the fin (3) width direction. In the raised heat exchanger (1),
Heat exchange, characterized in that, among the louvers (4) in the fins (3), a louver (4) having a narrower width than that of the louvers (4) formed in other portions is formed at appropriate positions. vessel.   Among the fins (3) adjacent to each other, the louver (4) formed on the rear side in the width direction of one fin (3) is compared with the louver (4) formed on the other part. The heat exchanger according to claim 1, wherein the louver has a narrow width.   Of the fins (3), the louver (4) formed on the rear side in the width direction of the fin (3) is partially narrower than the louver (4) formed in another part. The heat exchanger according to claim 1, wherein the heat exchanger is configured as follows.   Among the fins (3) adjacent to each other, in the fins (3) adjacent to each other, the louver (4) formed on one fin (3) is compared with the louver (4) formed on the other fin (3), The heat exchanger according to claim 1, characterized in that the louver (4) has a narrow width.   Of the fins (3), the louver (4) formed on the rear side is configured to form a narrower louver (4) than the louver (4) formed on the front side. The heat exchanger according to claim 1.

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