JPS58221346A - Manufacture of solar heat collector - Google Patents

Abstract

PURPOSE:To shorten a time necessary for manufacturing and increase the mass-productivity of the collector by a method wherein a non-crystalline glass layer is molten by heating the abutting part of a sealing plate against a glass tube to joint the opening end of the glass tube and, thereafter, the glass tube and the vicinity of the joining part of the sealing plate are heated to apply thermal strain removing treatment. CONSTITUTION:The surfaces of frusto-conically slanted abutting part 1a and a flange 1b are heated to obtain oxide films and paste-like non-crystalline lead glass powder is coated on the oxide films, thereafter, they are heated to calcine them. When the non- crystalline glass layer 8 begins to be softened by the heating, the glass tube 3 and the sealing plate 1 are collided and pressurized to joint them while the vicinity of the jointing part of the glass tube 3 and the sealing plate 1 is heated to remove the strain and solidify them by natural cooling. A line contact between the corner of an end 3a and the abutting part 1a is effected and the non-crystalline glass is induced into the vicinity due to capillarity, therefore, a perfect air-tightness may be achieved. The glass layer 8 is molten at a low temperature and the sealing plate 1 is heated locally, therefore, the non-crystalline glass layer 8 may be brought into a molten condition in a short period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a solar heat collector comprising a heat collecting element which is disposed in a solar heat collector and whose end portion penetrates a sealing plate and protrudes to an external force.

Conventional collection of seeds lv! The method of manufacturing the Il container will be explained with reference to FIG.
Crystalline lead powder glass is injected into 1, and the glass tube (3) is heated in an electric furnace (not shown) to melt the lead powder glass in a state where the glass tube (3) is erected in the groove (2), and then cooled. Sealing plate (11
and the glass tube (31) are firmly fixed to the crystalline glass layer.

However, according to the conventional calligraphy, it is necessary to melt and condense the lead powder glass in an electric furnace, and the glass tube must be heat treated in the same way, and heating and cooling suitable for the glass tube must be done. If this is not done, thermal distortion will occur in the glass tube, leading to damage. A heat cycle suitable for glass traps, for example, as shown in Figure 2, requires a very long time for one cycle, and the entire heat collector must be heated and cooled, which has been a bottleneck in mass production.

The present invention addresses the above-mentioned problems, and aims to provide a method for manufacturing a solar heat collector that can be mass-produced and reduce costs, and also aims to achieve an airtight connection between the sealing plate and the glass tube. do.

The configuration of the present specific invention includes a transparent male glass tube with an open end, a sealing plate that closes the opening, and a heat collecting element that is disposed inside the glass tube and whose end penetrates the sealing plate and projects to an external force. A method for manufacturing a solar heat collector comprising: heating a glass front contact portion of a sealing plate coated with an amorphous glass layer to melt the amorphous glass layer; The configuration of the dependent invention is further characterized in that the glass front abutting portion of the sealing plate is inclined to widen toward the end.

According to the configuration of the specific invention, there is no need to heat the glass tube for a long time when melting the amorphous glass layer, and it is only necessary to heat the glass tube for a long time, so that damage due to thermal distortion of the glass tube can be reduced compared to conventional methods. This eliminates the need for long heating and cooling times, allowing mass production of heat collectors and reducing costs. Furthermore, according to the dependent invention, since the sealing plate and the amorphous glass are drawn in along the annular contact portion by capillary action, a complete airtightness can be achieved, and excess amorphous glass is released from the blue light of the glass onto its surface. Since the bonding agent is attached to the glass tube, the stress distribution generated between the glass tube and the amorphous glass is equalized, and the strength of the bonded portion is as good as that using a bonding agent for crystallized glass.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 5. Figure 5 shows the main parts of the heat collector in its completed state. A material with a modulus (e.g. saw tube (6)
'7) is a heat collecting cord provided within the glass tube (3) so as to protrude outward through the glass tube (3). As shown in Fig. 5, the Moeki seal signboard 11) has an outer diameter larger than the outer diameter of the glass tube (3), and a glass tube contact point (6a) that the 41st part (6a) of the glass tube (3) comes into contact with.
1a) so as to widen towards the end (the direction of inclination may be either direction), and then horizontally 7
It forms a lunge (Ib).

To explain the manufacturing method of the heat collector having the configuration E below, first, in the previous step, the outer edge of the sealing plate +1) having the configuration shown in FIG. 6,
That is, an oxide film is formed on the surfaces of the contact portion (1a) and the 7th flange (1b), and amorphous powder lead glass t+4=+L<
After applying a paste-like liquid by adding a binder, it is naturally dried (for example, left at room temperature for about 20 hours), and then heated and fired in an electric furnace to form an amorphous glass layer (8). . The thermal history of this firing depends on the properties of the amorphous glass, but for example, it takes about 40 minutes to raise the temperature to about 460°C, about 15 minutes to heat at this temperature, and about 60 minutes to cool it down. It will be of a certain extent. Although it takes a long time to dry naturally and bake, the sealing plate (1) itself is small, so
Since a large amount can be processed in bulk before the main process described later, it does not become a bottleneck in mass production.

Next, in this step, a sealing plate (1) is attached as shown in FIG.
There is a high-frequency induction heating block coil (9) as a heating means near the
), and when the amorphous glass layer (8) begins to soften due to conductive heating by supplying power to it, immediately pressurize the glass tube +81 by colliding with the sealing plate (1) as shown by arrow A. As in the fifth factor, when bonding is achieved and the temperature of the bonded portion of the glass tube (3) rises and becomes compatible with the amorphous glass layer (8), power supply to the rear wheel (9) is stopped.

In addition, if the end of the glass tube (3) is heated for a short time using a burner or the like to raise the temperature before colliding with the glass tube (8), K will be more compatible with the amorphous glass layer (8). Therefore, preheated power is preferable. Further, as a means for locally heating the sealing plate (1), a wire ring (slKN) is not specified.

Thereafter, the vicinity of the joint between the glass tube (3) and the sealing plate +1) is heated with a heating means (not shown) such as a gas flame or an electric heater to remove thermal strain and solidify by natural cooling.

In the above process, the glass tube +B) and the sealing plate f1> and 5
When performing collision angle pressure welding, the corner of the end (6a) of the glass tube (3) and the front glass abutment part (1a) of the sealing plate (ill) come into annular line contact, and the vicinity thereof is non-contact due to capillary action. The crystalline glass is retracted in a circular manner to ensure complete airtightness. Since the excess amorphous glass clings to the end of the glass tube (3) and its surface, the stress distribution generated between the glass tube (3) and the amorphous glass is equalized, and the strength of the joint is lower than that of the crystalline glass. It is as good as that using as a bonding agent.

In addition, according to the above-mentioned method of writing examples, the amorphous glass layer (8) is easily melted at a relatively low temperature, and the sealing plate 11) is locally heated during this melting and heating, so that The amorphous glass layer (8) can be melted down, and then the glass tube (3) can be melted down.
) and the sealing plate (1) and perform the above-mentioned thermal strain removal treatment, the time required for this process is, for example, 5 to 7 minutes, which can significantly shorten the time required for manufacturing, and Cost reduction is possible.

6 to 8 are other embodiments of the present invention, which differ from the above-mentioned top embodiment in that they have an annular groove (
1C), and as a result, the amorphous glass adheres to the outer peripheral edge of the glass tube (3), making it possible to obtain an even stronger bond. In FIGS. 6 to 8, the same elements as in FIGS.

Note that the present invention is not limited to the embodiment described in E, but includes a sealing plate (1),
Various materials can be used for the amorphous glass layer (8) and the glass tube (3). For example, if the vitreous tube (3) is made of hard glass,
The sealing plate (1) is made of copal, which has a similar coefficient of thermal expansion.

An iron alloy may be used, and an amorphous hard glass layer may be formed on the surface of the sealing plate (1).

[Brief explanation of the drawing]

：＠、、Figure 1 is a cross-sectional view of the main parts of a heat collector manufactured according to the conventional example, Figure 2 is a time-heating temperature characteristic diagram of the heat collector according to the conventional example, and Figure 3 is a diagram according to an embodiment of the present invention. Component diagrams of the heat collector to be manufactured, (a) is a cross-sectional view, (b) is a perspective view, FIG. 4 is a cross-sectional view of main parts explaining the manufacturing method of the same embodiment, and FIG. 5 is the same example. Figures 6(b)(b), 7(b), and 8(b) show other embodiments of the present invention; This is a diagram corresponding to FIGS. 4 and 5. 1+1+...Sealing plate, (1a)...
- Contact portion, (3)...glass tube, (8)...amorphous glass layer.

Claims (1)

[Scope of Claims] il) A transparent glass tube with a closed end, a sealing plate that closes the opening, and a collector disposed inside the glass tube, the end of which protrudes from the sealing plate to an external force. In the manufacturing method of a solar heat collector comprising a thermal element, the glass front contact portion of the sealing plate coated with the amorphous glass layer is heated to melt the amorphous quality glass layer, and the amorphous glass layer is melted. A method for manufacturing a solar heat collector characterized by: (2) A method for manufacturing a solar heat collector according to Item 1, characterized in that the glass front abutting portion of the sealing plate is inclined in a widening-toward-downward manner.