Heat exchanger

Abstract

A heat exchanger, in which louver wall surfaces (3c) are twisted at a predetermined angle (θ1) with respect to a plurality of flat portions (3a) of fins (3) and an inter-louver path (5) is formed between the adjacent louver wall surfaces (3c), is disclosed. The center points (3d) of some louver wall surfaces (31c) are displaced from the center points (3d) of the other louver wall surfaces (32c) along the cooling water flow direction (X1). As a result, the real louver pitch height (HLP) is increased beyond the louver pitch heights (HLP1, HLP2) of the louver wall surfaces (31c, 32c), respectively. Even in the case where the louver width (L) is reduced, therefore, the cooling air can be caught by the louver wall surfaces (3c).

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to a heat exchanger effectively applicable to a radiator for exchanging heat between the cooling water of an internal combustion engine and the air. [0003] 2. Description of the Related Art [0004] In a conventional heat exchanger, the fins have louver wall surfaces of which the forward end effectively improves the heat transfer rate. By tilting the louver wall surfaces, at a predetermined angle to flat portions, the cooling air flow is changed and introduced to a path between adjacent louver wall surfaces (inter-louver path), thereby improving the heat transfer rate of the fins (Japanese Unexamined Patent Publication No. 2003-83690). SUMMARY OF THE INVENTION [0005] In the conventional heat exchanger described above, shortening of the louver width to improve the performance reduces the louver pitch height (the size of the louver wall surface in the cooling water flow direction X1), and therefor...

AI Technical Summary

Benefits of technology

[0006] In view of the above-mentioned fact, the object of this invention is to provide a heat exchanger in which the cooling air can be easily caught by the louver wall surfaces even with a shorter louver width.

[0008] With this configuration, the louver pitch height HLP in real terms is increased and, even when the louver width is shortened, the cooling air can be caught by the louver wall surfaces. Therefore, the cooling air can be positively introduced to the inter-louver path, and the heat transfer rate of the fins can be improved.

[0011] With this configuration, the real louver pitch height HLP is increased, and even when the louver width is shortened, the cooling air can be caught by the louver wall surfaces. Thus, the cooling air can be positively introduced to the inter-louver path for an improved heat transfer rate of the fins.

[0014] With this configuration, the real louver pitch height HLP is increased and, even when the louver width is shortened, the cooling air can be caught by the louver wall surfaces. Thus, the cooling air can be positively introduced to the inter-louver path for an improved heat transfer rate of the fins.

Problems solved by technology

In the conventional heat exchanger described above, shortening of the louver width to improve the performance reduces the louver pitch height (the size of the louver wall surface in the cooling water flow direction X1), and therefore the cooling air cannot be easily caught by the louver wall surfaces.

As a result, the cooling air cannot be introduced to the inter-louver path.

In spite of an improved effect at the forward end, the heat transfer rate of the fins cannot be improved.

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