JPS6021726Y2 - Evaporator - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to an evaporator, and particularly to an evaporator that prevents air leakage from a portion without fins in order to improve its heat exchange efficiency.

2. Description of the Related Art A conventional evaporator 1, as shown in FIG.
and fins 3 interposed between each straight pipe portion 2a of the flat pipe 2.
A wind shielding cover 4 that covers each bent portion 2b of the flat tube 2 and the gap therebetween is known.

The wind shield cover 4 is made of plating sheet, and is soldered to the front end of the top surface of the bent portion 2b of the flat tube 2 and the front end thereof.

Problems to be Solved by the Invention The evaporator 1 described above can prevent air from leaking from the part without fins 2, and is therefore effective in improving heat exchange efficiency. There is a problem.

That is, the problem is that the flat tube 2 may leak.

The mechanism by which leakage occurs in the flat tube 2 can be considered as follows.

Defects such as blowholes occur in the soldered joint between the flat tube 2 and the wind shielding cover 4.

On the other hand, if the evaporator is operated as a refrigeration cycle,
Due to its function, a large amount of condensed water is generated.

This dew condensation water penetrates into the defective part of the soldering and repeats freezing and melting, thereby creating holes and cracks in the tube from the defective part.

The object of this invention is to provide an evaporator that solves the above problems.

Means for Solving the Problems The evaporator according to this invention has a meandering flat tube consisting of a straight pipe section and a bent section, fins interposed between each straight section of the flat tube, and each bent section of the flat tube. In an evaporator, the wind blocking cover is comprised of a cover plate that is placed against the front end surface of each bent portion, and a cover plate that extends rearward from the upper edge of the cover plate in front of the top surface of each bent portion. The upper projecting edge hooked to the end, the lower projecting part extending rearward from the lower edge of the cover plate and inserted between adjacent straight pipe parts and deflected by the fins, and the rear edge of the upper projecting edge Of the flat tube, fins, and wind shield cover, only the fin is formed of a praising sheet, and the fin has a lower protrusion and an L-shaped protrusion that extends downward from the bottom end and has a fin. The lower end portions of the protrusions are each soldered.

The working windshield cover is soldered to the fins, but is not soldered to the flat tube even though it comes into contact with it.

Embodiments Hereinafter, embodiments of this invention will be described with reference to FIGS. 2 to 5.

The evaporator 11 according to this invention is similar to the conventional one described above, and includes a meandering flat tube 5 consisting of a straight tube section 5a and a bent section 5b, and fins 6 interposed between each straight tube section 5a of the flat tube 5. and a wind shielding cover 7 that covers each bent portion 5b of the flat tube 5 and the gap therebetween, but among the flat tube 5, fins 6, and wind shielding cover 7, only the fin 6 is made of plating sheet. It is very different from the conventional one in the way it is formed.

The wind shielding cover 7 is integrally formed from an aluminum alloy sheet material, and includes a cover plate 71 that is bent against the front end surface of each bent portion 5b, and a cover plate 71 that extends rearward from the upper edge of the cover plate 71 and extends rearwardly from the upper edge of the cover plate 71. The upper projecting edge 72 hooked on the front end of the top surface of the cover plate 71 and the adjacent straight pipe portion 5 extending rearward from the lower edge of the cover plate 71
It consists of a lower protrusion 73 that is inserted between the gaps 7a and 6, and an L-shaped protrusion 74 that extends downward from the rear edge of the upper projecting edge 72 and whose lower end is angled against the fins 6.

The cover plate 71 is formed into a substantially cut circular shape.

The cover plate 71 has a rearwardly formed substantially semicircular protrusion 71a that is fitted inside each bent portion 5b of the flat tube 5, and extends from the upper left side of the upper edge to the upper protrusion 72 to extend the refrigerant tube 8. A notch 7a is formed through which the hole is passed.

The upper projecting edge 72 is in contact with the top surface of the bent portion 5b of the flat tube 5,
A continuous wall surface is formed across each top surface.

The lower protrusion 73 exists discontinuously only in the inner side of each bent portion 5b of the flat tube 5.

The horizontal lower end 74a of the L-shaped protrusion 74 is tapered and inserted into the louver 6a of the fin 6.

Furthermore, a bead 74b is formed from the vertical portion of the L-shaped protrusion 74 to the upper protrusion 72.

The horizontal lower ends of the lower protrusion 73 and the L-shaped protrusion 74 of the wind shield cover 7 are in surface contact with the fins 6.

By soldering these contact surfaces, the wind shield cover 7 is integrated with the flat tube 5 and the fins 6.

Effects of the invention According to this invention, since the wind shield cover is not soldered to the flat tube, it is possible to prevent the flat tube from being destroyed due to defects such as blowholes occurring in the soldered portion.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional example. Figures 2 to 5 show an embodiment of the invention, with Figure 2 being a perspective view showing the main parts of the invention, Figure 3 being a front view of the same, Figure 4 being a flat view of the same, and Figure 5 being a flat view of the same. , is a cross-sectional view taken along the line ■-V in FIG. 3. 5... Flat pipe, 5a... Straight pipe part, 5b
...Bend portion, 6...Fin, 7...
... Wind shield cover 71 ... Cover plate, 72 ...
... Upper protrusion, 73 ... Lower protrusion, 74
・・・・・・L-shaped ridge.

Claims (1)

[Scope of utility model registration request] A meandering flat tube 5 consisting of a straight tube portion 5a and a bent portion 5b, fins 6 interposed between each straight tube portion 5a of the flat tube 5, and a shield covering each bent portion 5b of the flat tube 5 and the gap therebetween. In the evaporator comprising a wind cover 7, the wind shield cover 7 includes a cover plate 7 which is bent against the front end surface of each bent portion 5b;
The cover plate 71 extends rearward from the upper edge of the cover plate 71 and is placed against the front end surface of each bent portion 5b, and the cover plate 71 extends rearward from the upper edge of the cover plate 71 and is hooked onto the front end portion of the top surface of each bent portion 5b. The fin 6 extends rearward from the lower edge of the cover plate 71 and is inserted between the adjacent straight pipe portions 5a.
It consists of a lower protrusion 73 that is deflected by the fins 6, and an L-shaped protrusion 74 that extends downward from the rear edge of the upper protrusion 72 and has its lower end deflected by the fins 6, and is connected to the flat tube 5, the fins 6, and the wind shield cover. 7, only the fin 6 is formed of a plating sheet, and the lower ends of the lower protrusion 73 and the L-shaped protrusion 74 are soldered to the fin 6, respectively.