JPS6022275Y2 - solar heat collector - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a solar heat collection device used in a solar heat utilization system.

This type of solar heat collector has a heat collecting pipe equipped with a heat collecting plate placed inside a glass container with the end of a glass tube hermetically closed with an end cap. The solar heat obtained by the plate is conducted to the heat medium flowing into the heat collecting pipe, thereby heating the heat medium.

However, in a device having such a configuration, the end cap has a flat plate shape and is formed with a thin wall in order to reduce weight. When an external force is applied, the end cap is likely to be deformed by this external force, and in some cases may be damaged by this external force.

This idea was devised in response to these circumstances, and its purpose is to make the end cap strong against not only the external force in the axial direction but also the external force in the radial direction perpendicular to the axial direction. It is an object of the present invention to provide a solar heat collecting device configured so as to prevent deformation and damage of the end cap.

An embodiment of this invention will be described below with reference to FIGS. 1 to 3.

In the figure, 1 is a glass tube made of borosilicate glass, for example, and both ends of the glass tube 1 have end caps 2.
A and 2b are airtightly closed.

These end caps 2a, 2b are composed of, for example, a thin conical peripheral cap 3 and a central cap 4, which are assembled in opposite directions in the axial direction of the glass tube 1.

That is, the outer edge of the peripheral edge cap 3 is airtightly glass-bonded to the end of the glass tube 1, and the inner edge is recessed toward the inside of the glass tube 1, and the outer edge of the center cap 4 is Above peripheral cap 3
The inner edge of the glass tube 1 is overlapped with the inner edge of the glass tube 1 to be airtightly joined, and the inner edge of the glass tube 1 protrudes outward from the glass tube 1.

A heat collecting pipe 5 is passed through the glass tube 1 at a position substantially on the tube axis.

This heat collecting pipe 5 constitutes a heat medium passage,
It is made of copper pipes with excellent thermal conductivity.

The heat collecting pipe 5 passes through the end cap 2aw2b in an airtight manner, but it passes through the end cap 2a in an airtight manner via a telescopic vibro, as shown in FIG. .

This telescopic vibro has an exhaust space 7 between it and the heat collecting pipe 5.
It has a double pipe structure, one end of which overlaps and is airtightly joined to the inner edge of the central cap 4, and the other end is hermetically joined to the outer surface of the heat collecting pipe 5.

Further, this extensible vibro is constituted by, for example, a bellows 8, and the thermal expansion and contraction of the heat collecting pipe 5 can be absorbed by the bellows 8.

Further, an exhaust pipe 9 is connected to this telescopic vibro.

This exhaust pipe 9 is connected to a vacuum pump when evacuating the inside of the glass tube 1, and is sealed when a predetermined exhaustion is completed.

The heat collecting pipe 5 passes through the other end cap 2b by airtightly joining the inner edge of the center cap 4 to the outer surface of the heat collecting pipe 5.

A heat collecting plate 10 is housed within the glass tube 1.

The heat collecting plate 10 is formed of, for example, a plate with excellent thermal conductivity, and is closely bonded to the outer surface of the heat collecting vibro.

Further, a selective absorption film (not shown) is provided on the surface facing the heat collecting plate 10 and the sun.

) is formed, and this selective absorption film improves the absorption of solar heat from sunlight.

Therefore, mainly the heat obtained by absorbing sunlight with this selective absorption film is thermally conducted to the heat medium flowing into the heat collecting pipe 5 via the heat collecting plate 10 and the heat collecting pipe 5. , it is possible to heat this heat medium.

Furthermore, since this device can evacuate the inside of the glass tube 1 to create a high vacuum, a heat insulating layer is formed by the vacuum space inside the glass tube 1 to prevent heat dissipation from the heat collecting plate 10. As a result, the heat obtained by the heat collecting plate 10 is well conducted to the heat medium, and the heat collecting efficiency is improved.

Note that 11 is a support for holding the heat collecting plate 10 on the tube axis of the glass tube 1.

According to the above-described embodiment having such a configuration, the end caps 2a and 2b are provided with a peripheral edge cap 3 having a conical shape.
and a center cap 4, and these end caps 2aw2b are combined in opposite directions with respect to the axial direction of the glass tube 1, so these end caps 2aw2b are the second
As shown in the figure and FIG. 3, the cross-sectional shape becomes a truss-like structure.

Therefore, even if these end caps 2a, 2b are formed thin, they can be made strong against external forces along the axial direction.

Furthermore, since the peripheral cap 3 and the central cap 4 are joined by overlapping and joining their inner and outer edges, the thickness of this joint is doubled and these ends are joined together. A thick annular rib is formed on the caps 2a and 2b.

Therefore, the end caps 2a, 2b can be made strong by the joints even against external forces perpendicular to the axial direction.

Therefore, by configuring these end caps 2a, 2b to be strong against the above-mentioned external forces, it is possible to prevent the end caps 2a, 2b from being deformed and damaged by these external forces.

Note that this invention is not limited to the above embodiment.

For example, the peripheral cap and the center cap constituting the end cap are not necessarily conical with a straight cross-sectional shape, but are also conical with a curved cross-sectional shape as shown in FIGS. 4 and 5. shaped end cap 12.
13 or, as shown in FIG. 6, a similar effect can be obtained even by using an end cap 15 having a flat portion 14 in part.

As explained above, this invention has a conical peripheral edge cap whose outer edge is hermetically glass-bonded to the end of the glass tube and whose inner edge is recessed toward the inside of the glass tube. and a central cap, which is also conical in shape and whose outer edge overlaps with the cone of the peripheral cap and is airtightly joined to it, and whose inner edge protrudes outward from the glass tube and is airtightly joined to the heat collecting pipe side. It is characterized by having been configured.

Therefore, the end cap is constructed by assembling these conical peripheral caps and central caps in opposite directions in the axial direction of the glass tube and overlapping and joining them. The end cap is not only subjected to external forces along the axial direction of the glass tube, but also
It is also strong against external forces in the radial direction perpendicular to the axial direction, and can prevent deformation and damage of the end cap due to the external forces.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of this invention.
The figure is an overall view of the device, FIGS. 2 and 3 are cross-sectional views showing the ends of the device, and FIGS. 4 to 6 are perspective views of end caps showing other modifications of this invention, respectively. be. 1------Glass tube, 2at 2bt
12t 13.15... End cap, 3.
...Peripheral cap, 4...Central cap, 5... Heat collection pipe, 10... Heat collection plate.

Claims (1)

[Scope of utility model registration request] a glass tube; an end cap that airtightly closes an end of the glass tube; a heat collection pipe that is disposed within the glass tube to airtightly penetrate the end cap and constitute a heat medium passage; A heat collecting plate is arranged in a glass tube in connection with the heat collecting pipe, and heats the heat medium by conducting the heat obtained by absorbing sunlight to the heat medium flowing into the heat collecting pipe. In the solar heat collector, the end cap has an outer edge hermetically glass-bonded to the end of the glass tube, and a peripheral edge cap having a conical shape with an inner edge concave toward the inside of the glass tube; It is composed of a conical center cap that is overlapped with the inner edge of the peripheral cap to be airtightly joined, and the inner edge is protruded outward from the glass tube to be airtightly joined to the heat collecting pipe side. A solar heat collecting device characterized by: