JPH0345037Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Technical field of the invention The present invention relates to a heat exchanger. More specifically, the present invention relates to improving the heat exchange performance of a heat exchanger having a core consisting of multiple layers of plate fins and round tubes passing through each plate fin.

(b) Background of the Technology In a heat exchanger equipped with a core consisting of multiple layers of fins and tubes passing through each fin, there is a correlation between the air passing through the core and the heat exchange performance.

That is, FIG. 5 shows a radiator that cools the cooling water of the internal combustion engine as a heat exchanger, and this radiator has multiple layers of fins 1a and each fin 1a.
It has a structure in which a pair of tanks 2 and 3 are provided above and below a core 1 consisting of a tube 1b passing through the core 1.
The cooling water W flowing into the upper tank 2 flows into the tube 1.
b and reaches the tank 3 at the bottom, heat is radiated via the tube 1b and the fin 1a, and the passing wind C of the core 1 promotes this heat radiation, and the heat is transferred to the radiator It is removed outside.

However, as shown in FIG. 6, in the case of a core 1 having a structure in which the fins 1a are plate fins and a round tube-shaped tube 1b is penetrated through a through hole 1c drilled in the fin 1a, the air passing through the tube 1b is Kalmar vortex etc. occur on the downstream side of C, and the passing wind C
A stagnation part P is generated, and heat exchange with the fin 1a and tube 1b in this stagnation part P is impaired. In addition, this stagnation part P acts as a resistance to the passing wind C passing around it, and thus affects the passing wind C as a whole and obstructs the passing of the passing wind C, thereby degrading the heat exchange performance.

Therefore, the development of a heat exchanger equipped with a core 1 in which the stagnation part P of the passing air C does not occur is expected.

(c) Prior art and problems In this technical background, the stagnation part P
Means have been provided to reduce the

7 and 8 show a conventional means known as a heat exchanger core disclosed in Japanese Utility Model Application Publication No. 57-178984.
b is approximately egg-shaped with respect to the passing wind C, and by making the tube 1b approximately diamond-shaped in FIG. 8, the passing wind C is actively guided to the downstream side of the tube 1b to reduce the stagnation part P. That is.

However, according to this conventional example, tube 1
In order to make b approximately egg-shaped and approximately diamond-shaped, tube 1b
There is a problem that the manufacturing of the fin 1 is complicated and the manufacturing cost increases.
Tightly press tube 1b to the burring part of a.
It is difficult to transfer the heat to the fins without resistance and ensure a sufficient amount of heat dissipation.
There are problems such as the need to change the specifications.

(d) Purpose of the invention The present invention was made in view of the problems of the conventional method, and its purpose is to reduce the stagnation part of the passing air without modifying the round tube, and improve heat exchange. The aim is to improve the heat exchange performance of the vessel.

(e) Structure of the invention In order to achieve this object, the heat exchanger according to the invention is a heat exchanger equipped with a core consisting of multiple layers of plate fins and round tubes penetrating each plate fin. A through hole is provided in each plate fin to allow the tube to pass therethrough, using a perforating means such as a burring or the like in which a cut-out portion is formed;
The part surrounded by the incision of the through hole,
With respect to the passing wind of the core, the radius of the through hole is long in the downward direction of the passing wind, and the upstream side is a large circular part and the downstream side is tapered. This is where the tube is located.

(f) Examples of the invention Hereinafter, examples of the heat exchanger according to the invention will be described based on the drawings.

Fig. 1 shows a cross section along the plane of the plate fin 1a of the heat exchanger according to the present invention, and the radius is long in the downward direction of the passing wind C, and the upstream side is a large circular part 1c'. The round tube 1b is shown passing through the large circular portion 1c' of the through hole 1c, which is approximately egg-shaped and tapered on the downstream side. Therefore, the small circular portion 1c'' of the through hole 1c other than the large circular portion 1c' through which the round tube 1b passes is a gap.

This approximately egg-shaped through hole 1c has a second
As shown in FIGS. 3 and 3, a cut-and-raised portion S is formed by a drilling means such as a burring, and the area surrounded by this cut-and-raised portion S is the through-hole 1c. They are the same.

The fact that the cut and raised part 7 is approximately egg-shaped means that, as in the conventional example described above, the passing wind C is actively guided to the downstream side of the through hole 1c, and the stagnation part P is reduced. become.

Figures 2 and 3 explain the relationship between the back surface of the cut and raised part S and the fin pitch. Even if the height of the cut and raised portion S is lower than the fin pitch, the stagnation portion P can be reduced. That is, by making the through hole 1c approximately egg-shaped, the perforation area is expanded compared to, for example, a circular shape, and thereby the height of the cut portion S can be increased. Therefore, by making the height of the cut-and-raised portion S the same as the fin pitch, the cut-and-raised portion S can be used as a substitute for the pico that defines the fin pitch, and the laminated state of the plate fins 1a as shown in FIG. 2 is obtained. For example, with respect to the passing wind C, the structure is similar to that in the case where the tube 1b is approximately egg-shaped in the conventional example. Further, as shown in Fig. 3, if the height of the cut and raised part S is lower than the fin pitch, the part of the round pipe tube 1b that is not surrounded by the cut and raised part S will stagnate on the downstream side of the round pipe tube 1b. However, since the small circular part 1c'' of the insertion hole 1c is a gap, a downward flow (or an upward flow) along the round tube tube 1b is generated as shown in the figure. The stagnation part P on the downstream side of the round pipe tube 1b is reduced.Furthermore, since such a downward flow also occurs on the downstream side of the cut and raised part S, the stagnation part P on the downstream side of the through hole 1c is reduced. will be promoted.

Fig. 4 shows an embodiment in which a rectifier plate 4 is provided around the cut and raised part S of the through hole 1c, and the passing air C' that passes while contacting the cut and raised part S and the other passing air C' are shown. This prevents the loss of the passing energy of the passing wind C by separating the flow from the passing wind C. According to this embodiment, the cutout portion S has resistance even if it is streamlined.
There is an advantage that the overall flow of the passing wind C of the core 1 can be made smooth by separating the flow of the passing wind C' which passes through in contact with the core 1 from the other passing wind C'. The current plate 4 is preferably formed by cutting and raising the plate fins 1a.The cutting and raising means allows formation even in the case of a narrow fin pitch, and the weight does not increase compared to fixing a separate member. There are advantages.

(g) Effects of the invention As described above, the heat exchanger according to the invention can use the round tube as is, and only requires modifying the through hole through which the round tube is inserted, making it easy to manufacture and reducing manufacturing costs. First, there is also an effect that can be implemented by modifying existing plate fins.
Furthermore, even by simply modifying the through holes, the stagnation portion of the passing air is reduced and the heat exchange performance is improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the main parts of an embodiment of the heat exchanger according to the present invention, FIGS. 2 and 3 are central longitudinal sectional views of FIG. 1, and FIG. 5 is a side view of an example of a heat exchanger showing the technical background of the present invention; FIG. 6 is an enlarged sectional view of the same essential parts;
FIGS. 7 and 8 are cross-sectional views showing conventional examples. 1...Core, 1a...Plate fin (fin), 1b...Round tube tube (tube), 1c...
...Through hole, C, C'... Passing wind, S... Cutting part.

Claims (1)

[Scope of utility model registration request] In a heat exchanger equipped with a core consisting of multiple layers of plate fins and round tube tubes that pass through each plate fin, the through holes drilled in each plate fin to insert the round tube tubes are cut by burring, etc. The radius of the through hole is long in the downward direction of the wind passing through the core, and the upstream side is a large circle. 1. A heat exchanger characterized in that the heat exchanger is approximately egg-shaped with a tapered downstream side, and a round tube is located in the large circular portion of the egg-shape.