JPS5977256A - Solar heat collector - Google Patents

Abstract

PURPOSE:To heighten the productivity and improve the corrosion resistance by a method wherein the open angle of a V-shape gap formed by the parts lying between flow passage grooves of a pair of metal plates is widened. CONSTITUTION:Two sheets of metal plates 8 and 9, having a plurality of strips of parallel groove parts 7, which serve as flow passages 6, are superposed in such a manner that the groove parts 7 face opposite to each other. The metal plates 8 and 9 are joined together with each other by welding together parts 8a and 9a lying between the groove parts 7 by roll-spot welding or the like. After that, gaps 11 made between the parts 8a and 9a of the metal plates 8 and 9 are deformed plastically in a state open in a figure V by increasing the pitches P between joints 10 and applying pressure from the inner part of the flow passages 6. An open angle alpha of the gap obtained after said plastic deformation is 3.6 deg. and more. Local corrosion can be reduced and prevented, because the widening of the open angle alpha of the gap 11 can be performed only by applying pressure. Consequently, the manufacturing work is simplified and furthermore no extra raw material is required.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application in Industry This invention is made by joining metal plates by welding or the like, and injecting an anticorrosive liquid into the flow path of the machine. First, it is a solar heating system that uses city water or household water directly.

The conventional example of tln T8'y, and its review, the city water and well water in the Ichikaigan area, etc., have a high chlorine content and a high degree of publicity, making it easy to corrode metals. . 7) Conventional method 1/)I for ensuring the corrosion resistance of 4-1S glaze in the 411 section will be explained based on the drawing.

As shown in FIG. 1.FJ I+
As the gap filling method of item 4, a method is used in which the groove-shaped resin inside the container is pumped, held for a certain period of time, and then discharged and dried. However, not only does it take a long time, about 30 minutes per heating device, but the tt'4 fat 4 penetrates into the gaps! Completely seals the gap due to the pores that occur in the small resin ++r't. 1. It is difficult to close the seals 1' and 1', and it is also very difficult to connect the seals 1' and 1' to the test tube. Bud, resin 4, seven gold rhinoceros board 3
Although long-term adhesion is required, P of the gold trit plate 3
Le'tI Zhang.

There is an rHT vri that when peeling due to deterioration in followability to shrinkage, cracking due to deterioration due to shrinkage, etc. occur, the area becomes a gap, which becomes a cause of corrosion.

As another conventional example, as shown in Tr 2 +r4, a metal with a stainless steel mark, such as aluminum or magnesium, is inserted into the joint part 2 of the stainless gold 17N plate 3' having a difficult path l', and the sacrificial anode 5 is inserted. There is a method that attempts to protect the crevices that are prone to corrosion due to stiffness. However, in this method, the stainless metal plate 3' is welded through aluminum or magnesium, which narrows the range of appropriate welding conditions and requires temporary fixing of the sacrificial anode metal, making it difficult to manage the welding schedule. Than! II L
＜、■J title that the industry will also increase. Additionally, once the sacrificial rays are no longer eluted, corrosion begins at that location.

Furthermore, these conventional methods require a resin material for filling, a sacrificial anode metal, etc., and have problems such as high cost.

purpose of invention This invention has good productivity and low manufacturing cost.

The purpose of the present invention is to provide solar parts with improved corrosion resistance.

Structure of the Invention The present invention is such that the V-shaped gap between the channel grooves of a pair of metal plates has an opening angle of 3.6° or more. . By widening the opening angle of the gap in this way, corrosion N1 is reduced.

DESCRIPTION OF THE EMBODIMENTS One embodiment of the present invention is shown in FIGS. 3 and 4. To explain the manufacturing method, two metal plates 8.9 each having a plurality of parallel grooves 7 forming the flow passages 6 are stacked one on top of the other with the grooves 7 facing each other. The metal plates 8.9 are joined to each other at the center of the portions 8R and 911 between the 1M portions 7 by roll spot q contact or the like. Then, the pitch P between the joints 10 is increased, internal pressure is applied from the inner surface of the flow path 6, and the gap 11 between the portions 83°9a of the metal plates 8 and 9 is made into a V-shaped state. This plastic deformation makes μ[1 mr!Fα 3.6° or more.

FIG. 4 shows the results of a corrosion test run fTfx of the structure thus constructed and the structure with an opening angle of -28 degrees. The test method is chloride ion (CI) 1200p
This is a method in which the heat collector is immersed in a corrosive solution containing 20 ppm of copper ions and 20 ppm of copper ions (Cu''-+).
, that is, the use of corrosion resistance due to corrosion weight loss, the striking angle α = 3,6° compared to the case where the striking angle α = 2.8°.
As shown in Figure 4, the corrosion weight loss was approximately 172°.

In this way, by simply widening the angle α of the gap 11 by applying pressure, it is possible to reduce and prevent the corrosion f in the area H1. Therefore, there is no need for resin materials or sacrificial μ71 poles than in the past, and #I! ! Construction ('P Haya is Menton, and there is no need for extra materials and the material cost is 1
The number can be reduced.

Effects of the Invention The present invention has the advantage that it not only improves corrosion resistance, but also improves productivity and reduces material costs.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional example, and Figure 2 is a sectional view of another conventional example.
Figure i and Figure 3 are cross-sectional views of one embodiment of the present invention, and Figure 4 is a graph showing the results of corrosion testing of the same embodiment and a comparative example. 6... Channel, 7... Groove, 8.9... Metal plate, 8
a. 9a...Part between grooves, IQ...Joint part, 11.
...Gap, α...Open A angle figure 2 figure 3 figure 4

Claims (1)

[Claims] i'IIi: Negative 2 of the parallel dances of several stripes of the collar
174 pieces of gold plate) 111 are placed one on top of the other with the grooves facing each other, and along the center of the part between the grooves, the two metal plates 1,
The plates are joined, and a V-shaped gap is provided between the grooves of both fully bent plates from the joint part to the groove 11j (+111), and the opening angle of this gap is 1 total 3.6° or more. A mature sun or vessel.