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Heat exchanger having header tanks

Inactive Publication Date: 2005-03-10
CALSONIC KANSEI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] In the above-mentioned situation, it is an object of the present invention to provide a heat exchanger that can prevent the molten brazing filler metal from reaching the tip surfaces of the tubes in insertion into the insertion grooves of the inner member while assuring the brazing strength about the tubes.

Problems solved by technology

Consequently, due to the capillary phenomenon of the former clearance, the molten brazing filler metal further creeps in the back of the insertion groove and reaches the tip surface of the tube, so that an opening (communication part) at the tip of the tube may be clogged up with the molten brazing filler metal disadvantageously.

Method used

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  • Heat exchanger having header tanks
  • Heat exchanger having header tanks
  • Heat exchanger having header tanks

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0039] According to the invention, as shown in FIG. 3, each insertion groove 15 is provided with a broad portion 16 whose inside width W2 is larger than an inside width W1 of the insertion hole 14 in the plate 10 in order to suppress the capillary phenomenon of molten brazing filler metal R in respective clearances δ2 each between the tube 3 and the inner wall of the insertion groove 15.

[0040] Additionally, it is noted that the broad portion 16 is formed throughout the insertion groove 15.

[0041] With the above-mentioned structure, owing to the provision of the insertion groove 15 with the broad portion 16 having its inside width W2 larger than the inside width W1 of the insertion hole 14, when brazing the insertion hole 14 of the plate 10 to the tube 3 inserted thereinto, the molten brazing filler metal R stays in the broad portion 16 of the insertion groove 15 to form a fillet 17, so that it is possible to prevent the brazing filler metal R from reaching the tip surface of the tub...

second embodiment

[0044] According to the invention, the broad portion 16 of the block 11 is formed at a bottom part 15b of the insertion groove 15.

[0045] An inlet portion 15c of the insertion groove 15 is formed so that an inside width W3 is generally equal to the inside width W1 of the insertion hole 14 of the plate 10.

[0046] Thus, according to the second embodiment of the invention, since the end 3a of the tube 3 is positioned in the broad portion 16, it is possible to prevent the brazing filler metal R from reaching an opening at the tip of the tube 3, as similar to the first embodiment of the invention. Particularly, since it is possible to make the inside width W3 at the inlet portion 1c of the insertion groove 15 generally equal to the inside W1 of the insertion hole 15 of the plate 10, the brazing filler metal R molten in brazing reaches the inlet portion 15c of the insertion groove 15. Consequently, it is possible to fix the end 3a of the tube 3 with both of the insertion hole 14 and the in...

embodiment

3rd. Embodiment

[0050]FIG. 7 shows the third embodiment of the invention. In the third embodiment, elements identical to those of the previously-mentioned embodiments are indicated with the same reference numerals respectively and their overlapping descriptions are eliminated. FIG. 7 is an enlarged longitudinal sectional view of the substantial part of the header tank.

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PUM

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Abstract

A heat exchanger includes a pair of header tanks and a plurality of tubes. Each of the header tanks includes an outer member and an inner member, The outer member has insertion holes allowing insertion of the tubes, while the inner member has insertion grooves allowing insertion of respective ends of the tubes. The heat exchanger is provided by brazing the so-inserted tubes to the peripheries of the insertion holes of the outer member. In order to suppress capillary phenomenon of a molten brazing filler metal in a clearance between each insertion groove and the tube, a broad portion is formed in the insertion groove to have an inside width larger than an inside width of the insertion hole. When brazing the tube to the outer member and the inner member, the molten brazing filler metal does not reach the tip surface of the tube but remains in the broad portion while maintaining the brazing strength of the tube.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a heat exchanger having a pair of header tanks and a plurality of tubes inserted into the header tanks. More particularly, the invention relates to an attachment structure of the heat exchanger where the tubes are brazed to the header tanks. [0003] 2. Description of the Related Art [0004] In a heat exchanger, generally, a plurality of juxtaposed tubes are communicated with a pair of header tanks opposing to each other at an interval. Further, heat radiation fins are interposed between the adjoining tubes. In operation, heat exchange fluid flows from one header tank to the other header tank through the tubes. During this flowing of the heat exchange fluid, the beat exchanger carries out heat exchanging operation between the heat exchange fluid in the tubes and another heat exchange fluid passing through the fins. [0005] Meanwhile, when carbon dioxide gas as one supercritical fluid is ...

Claims

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Application Information

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IPC IPC(8): F28D1/053F28F9/02F28F9/18
CPCF28F9/18F28F9/0202F28D1/05375
Inventor HAKARIDANI, HIROYUKIYOMODA, MUTSUOKOIZUMI, HIROYASU
Owner CALSONIC KANSEI CORP