JPS6251382B2 - - Google Patents

Description

[Detailed description of the invention] A heat pipe is installed in a glass outer tube whose inside is evacuated, an end plate with a support tube is attached to the open end of the outer tube, and the heat pipe is protruded from the support tube. In a solar heat collector in which a support tube and a heat pipe are welded together, metal and glass are available as materials for the end plates. The metal one is sealed with fritted glass to the open end of the glass outer tube, making it easy to work with, but it also has good heat dissipation, so the heat from the heat pipe is transmitted through the support tube and dissipated from the end plate. It is disadvantageous.

On the other hand, glass end plates are advantageous in terms of performance because they do not radiate heat, but they have the disadvantage that the support tube is easily deformed during manufacturing. That is, to explain the conventional manufacturing method based on FIGS. 1 to 4, a thin wall-shaped proximal end 3a of a metal support tube 3 made of copper or the like is attached in advance to the periphery of the central hole 2 of the glass end plate 1. At the same time as embedding and fixing, an exhaust tip tube 5 for creating a vacuum inside the outer tube 4 is welded to the attachment hole 3b of the support tube 3. Then, the heat pipe 7 with the heat collecting plate 6 attached thereto is inserted into the support tube 3, the tip of the support tube and the heat pipe 7 are welded 8, and then the heat pipe 7 is heated inside the bottomed glass outer tube 4. After the pipe 7 is housed and the glass end plate 1 is positioned at the open end of the outer tube 4, heating of the open end portion of the outer tube is started from the outer periphery with the flame F of the burner 9. (Figure 2) When a plurality of burners 9 are used and the burners themselves are rotated, or when the outer tube 4 side is rotated and heated evenly, the open end of the outer tube 4 begins to melt and curves inward, causing the end plate to melt. 1 begins to be fused to the outer periphery. (Fig. 3) However, since the entire outer periphery of the end plate 1 is not fused to the outer tube 4 at the same time, the heat of the burner is transferred to the support tube 3 during further heating with the burner, especially at the base end of the thin part. 3a, the end plate 1 is softened and deformed, and the end plate 1 is inclined as shown in FIG. 4, and the end plate 1 and the outer tube 4 are fused together with the heat pipe 7 in contact with the central hole 2 of the end plate 1. produce defects.

The present invention has been made in view of the above points, and is described below in Section 5.
This will be explained based on FIGS. 8 to 8. Components that are the same as the conventional structure are designated by the same symbols.

The structure is the same, in which the heat pipe 7 with the heat collecting plate 6 is inserted in advance into the support tube 3 of the glass end plate 1 and the tip of the support tube 3 and the heat pipe 7 are welded 8.

The present invention is characterized by the structure of the exhaust tip tube 5 for evacuating the inside of the outer tube 4. That is, the tip opening surface is cut to become an inclined surface 5a, and a guide groove 10 made of brazing material is formed on the outer periphery of the tip tube 5 toward the tip of the inclined surface 5a. 3 through the mounting hole 3b and the tip of the inclined surface 5a is brought into contact with the heat pipe 7. After that, when the brazing material is poured through the guide groove 10, the heat pipe 7 and the tip of the inclined surface 5a of the exhaust chip pipe 5 are fused. At the same time, the peripheral edge of the mounting hole 3b and the exhaust tip pipe 5 are welded 12. The guide groove 10 extends slightly above the outer circumferential surface of the support tube 3 to facilitate the inflow of the brazing material.

Then, as in the conventional case, the end plate 1 is heated with a burner 9.
The outer periphery and the open inner end of the outer tube 4 are fused together, but in the present invention, the support tube 3 is attached to the tip and the exhaust tip tube 5.
Since the heat pipe 7 is welded to the heat pipe 8 and 11 at two locations, even if the support tube is softened by the burner, there is no risk of deformation as in the conventional case.

Thereafter, the inside of the outer tube 4 is evacuated using the exhaust tip tube 5, and the tip tube is cut by pressure to complete the solar heat collector.

Since the opening surface of the exhaust chip tube 5 is an inclined surface, even if it is welded to a heat pipe, it will not be blocked by the brazing material, so that the function of creating a vacuum will not be impaired.

The present invention can provide a solar heat collector with a simple structure that suppresses deformation of the support tube, facilitates manufacturing, and has stable quality.

[Brief explanation of the drawing]

Figures 1 to 4 illustrate the conventional structure, with Figure 1 being an exploded perspective view, Figures 2 to 4 being sectional views of main parts shown in the order of manufacturing steps, and Figures 5 and onwards showing the structure of the present invention. 5 is a perspective view, FIG. 6 is an exploded perspective view of the main part, and FIGS. 7 and 8 are sectional views of the main part showing the order of manufacturing steps. 4... Glass outer tube, 7... Heat pipe, 1... End plate, 3... Support cylinder, 5... Exhaust chip pipe, 5a... Inclined surface.

Claims (1)

[Scope of Claims] 1. A translucent glass outer tube, a glass end plate fused to one open end of the outer tube, a metal support cylinder bonded to the periphery of the central hole of the end plate, and installed in the outer tube. and a heat pipe having one end protruding from the support tube and welded to the tip of the support tube, the opening surface of the one end being an inclined surface,
A solar heat collector comprising: an exhaust chip tube which is inserted through a mounting hole provided in a support cylinder, and the tip of the inclined surface is brought into contact with the heat pipe and welded to create a vacuum inside the outer tube. 2. The solar heat collector according to claim 1, wherein a brazing material guide groove is formed on the outer periphery of the exhaust tip pipe toward the tip of the inclined surface.