JPH0249512Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention is used as an oil cooler, etc.
This invention relates to an improvement of the inner fin of a so-called multi-plate heat exchanger.

[Conventional technology]

This type of heat exchanger, for example, a plate type oil cooler, will be described with reference to FIGS. 4 and 5. An inner fin 4 is sealed in a plate tube 3 consisting of an upper plate 1 and a lower plate 2. Joint rings 5 are arranged to surround the inlet and outlet of the liquid to be cooled, and the joint rings 5 are stacked in parallel to each other at intervals, and flanges 6 and 7 are provided at both ends in the longitudinal direction to serve as inlets and outlets for the liquid to be cooled. It is designed to be cooled by a stream of air or a stream of liquid.

The welding points of the inner fin 4 and the joint ring 5 of both the upper and lower plates 1 and 2 are brazed to ensure complete sealing and efficient heat conduction.

In the oil cooler configured in this way, when lubricating oil is fed from the flange 6, for example, as shown in FIG. 5, the lubricating oil flows between the inner fins 4 in the plate tube 3 and is sent out from the flange 7. During this time, the heat of the lubricating oil is mainly transmitted to the plate tube 3 by the inner fin 4 and carried away by the cooling fluid or cooling air.

Therefore, the inner fins 4 must have a structure that efficiently absorbs the heat of the liquid to be cooled and transmits this heat well to the plate tube 3, and at the same time creates as little resistance as possible to the flow of the liquid to be cooled. This is desirable.

Conventionally, as shown in FIG. 6, the inner fin 4 has continuous peaks 4a and valleys 4b.
By shifting the rising portions 4c of the peaks 4a, the slits 4d are continuously opened at regular intervals to form the slit example 4e. It was common to have the structure shifted from that of 4e.

Then, the inner fin 4 configured in this way
A fin in which the slit row 4e is arranged at right angles to the streamline direction, that is, so that the liquid to be cooled flows from the X direction in the figure, is an H-type fin, and the slit row 4e is parallel to the streamline direction. In other words, Y
Those arranged so that the liquid to be cooled flows from the direction are V.
They were each called type fin.

In addition, the applicant previously disclosed in Japanese Utility Model Publication No. 56-46145 that, as shown in FIG. We are proposing a structure structured as follows.

[Problem that the invention attempts to solve]

However, in the above-mentioned H-type fin, as shown in FIG.
Since the inner fin passes through the inner fin in a curved manner, the fluid resistance increases, although the performance is good, and the V-shaped fin reduces the collision between the liquid to be cooled and the rising part 4c of the inner fin 4, as shown in (b) of the same figure. Since the fluid flows in a straight line, the fluid resistance is reduced, but there is a problem in that the performance also decreases in proportion to this.

[Means for solving problems]

In view of the above, the present invention not only can reliably improve heat conduction and heat transfer performance without significantly increasing fluid resistance, but also achieves
It is structurally different from the one described in Publication No. 56-46145, and was devised to provide a device with further improved performance. In a V-shaped fin in which a slit is formed in a rising part and a slit is provided in a rising part, a louver is provided in at least one of the peak part and the valley part, which is perpendicular to the streamline direction and whose rear part is bent inward. The inner fin for a heat exchanger is characterized by:

[Effect]

In addition to the conventional V-shaped fins that change the flow of the liquid to be cooled flowing inside the inner fin, the flow of the liquid to be cooled inside the inner fin is made to collide with a louver whose rear part is bent inward. The flow is also changed in the vertical direction, and turbulent flow is generated by this forced change in the flow on the plane and in the vertical direction.

〔Example〕

1 to 3 show an embodiment of the present invention, in which the inner fin 4 has a mountain portion parallel to the streamline direction, that is, the Y direction in which the liquid to be cooled flows, similar to the conventional V-type fin. 4a and troughs 4b are continuously formed, and by shifting the rising portions 4c of the peaks 4a in a direction perpendicular to the streamline direction Y, the slits 4d opening parallel to the streamline direction Y can be kept constant. Slit rows 4e are formed in succession with intervals, and the slits 4d in this slit row 4e are provided with their positions shifted from those in the adjacent slit rows 4e.

In addition to the above, the present invention has the following configurations. That is, an upper louver 4f is formed in the crest 4a by bending the rear part inward along the streamline direction, and an upper louver 4f is formed in the crest part 4b by bending the rear part inward in the streamline direction. lower louvers 4g are provided.

In this way, the upper and lower louvers 4f and 4g
By providing this, the flow of the liquid to be cooled is forcibly changed downward in the upper louver 4f and upward in the lower louver 4g, and this is combined with the change in the flow on the plane as the V-shaped fin. Then,
This aims to improve the heat conduction and heat transfer performance of the inner fin 4, and also prevents liquid resistance from increasing. Note that either one of the upper louver 4f and the lower louver 4g may be provided.

Then, the inner fin 4 configured as described above is attached to the upper plate 1 and the lower plate 2 in the same manner as described above.
The plate tubes 3 are sealed in a plate tube 3, which is stacked parallel to each other at intervals with a joint ring 5 placed so as to surround the inlet and outlet of the liquid to be cooled. The outside of these flanges 6, 7 is cooled by a flow of air or a flow of liquid.

[Effect of idea]

The inner fin according to the present invention is a V-shaped fin in which the peaks and valleys are continuously formed parallel to the streamline direction as described above, and a slit is provided in the rising part. Since the structure is provided with a graded paper bar in which at least one of the sections is perpendicular to the flow line direction and the rear part is bent inward, the flow of the liquid to be cooled is not only changed horizontally by the conventional V-shaped fins, but also by the louver. This is accompanied by a forced change in the vertical direction, and both changes work together to improve the performance of the inner fin in terms of heat conduction and heat transfer.

Moreover, since the direction in which the flow of the liquid to be cooled changes is distributed in two directions, there is an effect that the fluid resistance does not increase as much as compared to one direction.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention,
FIG. 1 is a perspective view, FIG. 2 is a front view, the right half of FIG. 4 is a front view, FIG. 5 is an enlarged sectional view of part A, FIGS. 6 and 7 are conventional examples, and FIG. 6 is a perspective view, and FIG. 7A and 7B are horizontal sectional views showing the flow of the liquid to be cooled and the direction of the slit rows, respectively, and FIG. 8 is a view corresponding to FIG. 7 showing another conventional example. 3...Plate tube, 4...Inner fin, 4a...Same peak, 4b...Same valley, 4c...
Same rising part, 4d... Same slit, 4e...
Same slit row, 4f, 4g...louver, 5...joint ring.

Claims (1)

[Scope of utility model registration request] A V with continuous peaks and troughs parallel to the streamline direction, and a slit in the rising part.
An inner fin for a heat exchanger, characterized in that the mold fin is provided with a louver that is perpendicular to the streamline direction and bent inward at the rear on at least one of the peaks and valleys.