JPS5846364Y2 - solar collector - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a solar collector.

The solar heat collector is a flat box with a medium (e.g. water) inside it.
There are two types: one that supplies and circulates the medium, and the other that inserts a small diameter steel tube to allow the medium to pass through a cylindrical vacuum glass tube. However, if you want to use solar heat to perform air conditioning and heating, you can use a vacuum glass tube. There is a problem in that the medium cannot be raised to the required temperature unless a method is used.

Therefore, vacuum glass tube solar collectors are expected to become more promising in the future, but these collectors have had various problems in terms of manufacturing and longevity.

This point will be explained with reference to a conventional vacuum glass tube type solar collector shown in FIGS. 1 and 2.

First, in FIGS. 1 and 2, 1 is an outer glass tube that serves as a transparent cover and a box.

Reference numeral 2 denotes a cylindrical fin having a selective absorption film applied to at least its outer surface, and is made by, for example, aluminum extrusion molding.

Reference numeral 3 denotes a heat collecting pipe which is made of a steel pipe or the like and which thermally adheres to the cylindrical fins 2 and serves as a passage for a heat medium heated by obtaining heat from the cylindrical fins 2 heated by solar heat.

4 is a seal plate at the end of the outer glass tube 1.

The seal plate 4 is made of iron, nickel, chromium alloy, etc., which has an expansion coefficient similar to that of glass, in order to be fixed to the outer glass tube 1. It is fused using bonding material 7.

Moreover, the heat collecting pipe 3 is brazed. In this way, the outer glass tube 1 and the seal plate 4 form a vacuum container.

5 is a space surrounded by the outer glass tube 1 and the seal plate 4, and a chip tube (not shown).

) is evacuated by a vacuum pump and the chip tube is sealed.

Reference numeral 6 denotes a spacer for holding the cylindrical fin 2 at a predetermined position inside the outer glass tube 1, and is made of, for example, ceramic.

In such a collector, the heat collection pipe 3 is located eccentrically from the center of the outer glass tube 1, so even if measures are taken to absorb the force caused by thermal expansion, the seal plate 4
The disadvantage is that the force is not applied uniformly, and the fused portion tends to be partially destroyed.

Therefore, when sealing the glass tube 1, it is necessary to match the thermal expansion coefficients of the glass tube 1, the sealing plate 4, and the sealing material 7 to make the sealed part strong. Kovar or the like is used for alloys and hard secondary glasses, and low melting point glasses with matching expansion coefficients are used as sealing materials.

However, metal materials such as 426 alloy and Kovar will rust and corrode if left in the atmosphere, so they are not suitable for being left outdoors like solar collectors.

Therefore, as a countermeasure against this problem, methods are used to treat the surfaces of these metals to prevent rust, such as by plating or applying rust preventive materials.

However, it is difficult to obtain long-term reliability with these treatments.

The present invention provides an extremely effective means to solve this problem, and its structure will be explained below with reference to FIG.

Note that the same parts as in FIG. 1 are denoted by the same reference numerals.

In FIG. 3, reference numeral 8 denotes a ring member having a U-shaped cross section and made of a metal material having a coefficient of thermal expansion similar to that of the glass tube 1 (for example, 426 alloy for soda glass). It is covered by.

Reference numeral 9 denotes a sealing member made of a metal material, which has a concave shape, and its peripheral edge 1
0 is welded to the tip 11 of the outer periphery of the ring member 8.

In addition, the heat collecting pipe 3 passing through this sealing device 9 and the sealing device 9
They are joined by welding or silver brazing.

Said ring member 8. Since the sealing tool 9 and the heat collecting pipe 3 are both made of metal, it is easy to seal them together (for example, by welding).
Therefore, it is not necessary to match each other's coefficients of thermal expansion.

Therefore, a corrosion-resistant metal material such as stainless steel or copper can be used as the sealing member 9, and there is no need to perform special anti-rust treatment as in the past.

Rust prevention treatment can be carried out extremely easily by requiring only the portion of the ring member 8 exposed to the outside air.

In addition, in FIG. 3, the tip end 11 of the ring member 8 is longer than the sealing material 7 and constitutes a free end, and the end of the sealing tool 9 is connected to this end, so that the sealing Changes due to thermal expansion of the tool 9 are not directly transmitted to the sealing material 7 and the glass tube 1,
The sealed portion is sufficiently protected.

As described above, according to the present invention, it is possible to obtain a solar collector whose sealed portion is robust and corrosion-resistant.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional solar heat collector, FIG. 2 is an enlarged sectional view of the main part thereof, and FIG. 3 is a sectional view of the main part of the solar heat collector of the present invention. Code: 1 glass tube, 7: sealing material, 8: ring member, 9
: Sealing tool.

Claims (1)

[Claims for Utility Model Registration] The open end of a cylindrical glass tube is sealed with a sealing tool, the inside of the glass tube is maintained in a vacuum state, a heat collecting pipe is provided inside this glass tube, and the heat collecting pipe is In a solar collector whose end portion is led out of the glass tube through the sealing member, a ring member having a U-shaped cross section and made of a metal material having a similar coefficient of thermal expansion to that of the glass tube is attached to the glass tube. A solar collector characterized in that a low melting point glass is adhered to the opening end, and a peripheral edge of a sealing member is bonded to the outer periphery of the ring member.