JPS5941482Y2 - solar collector - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a solar heat collector (hereinafter referred to as a collector), and particularly relates to the configuration of a heat collecting section.

Recent evacuated glass tube type collectors are designed to improve heat collection efficiency by providing a reflective section at the lower part of the inner surface of the glass tube, as shown in FIGS. 1 and 2.

In the figure, 1 is an outer glass tube that serves as a transparent cover and a vacuum container.

2 is a heat collecting pipe, and its outer circumferential surface, which becomes the heat receiving part, has
A sunlight selective absorption film 3 is formed.

Note that this figure shows an example in which a heat pipe is used as the heat collecting pipe 2.

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

The sealing plate 4 is made of iron, nickel, etc. whose expansion coefficient is similar to that of glass in order to maintain a good fusion state with the outer glass tube 1.
It is made of a chromium alloy or the like, and is fused to the outer glass tube 1 using a sealing material 5 such as a low melting point glass slit.

Moreover, it is brazed to the heat collecting pipe 2.

6 is a space surrounded by the outer glass tube 1 and the seal plate 4;
This is a vacuum section formed by evacuating the tip tube 7 with a vacuum pump and sealing the tip tube.

Further, the heat collecting pipe 2 is installed at a predetermined position inside the outer glass tube 1 with a spacer (not shown).

Note that the end seal can be omitted by making the seal plate 4 made of glass and processing it integrally with the outer glass tube 1.

Reference numeral 8 denotes a reflecting mirror provided on the inner peripheral surface of the lower part of the outer glass tube 1, and is made by vacuum evaporation of aluminum or the like.

The heat collecting pipe 2 is thus heated by solar energy, either directly or via a reflector, and evaporates the heat pipe working fluid sealed within the pipe.

This vapor moves towards the condensing section 2'' and condenses there.

The latent heat of condensation at this time heats the medium to be heated, such as water, flowing inside the header 9.

Although such a collector certainly has good heat collection efficiency, the heat collection pipe 2 must be installed at a position eccentric from the center of the glass tube 1 as shown in the figure, and the sealing work of the heat collection pipe 2 to the glass tube 1 is difficult. In addition, the reflector 8 must be attached to the inner surface of the glass tube, which makes the collector manufacturing work very difficult.

Therefore, in order to facilitate the sealing work of the heat collecting pipe 2 to the glass tube 1, it is being considered to provide the heat collecting pipe 2 on the central axis of the glass tube 1, but in that case, the position of the reflector 8 would have to be changed. For example, since the condensing efficiency of the reflecting mirror 8 onto the pipe 2 is significantly reduced, the reflecting mirror 8 must be floated upward by approximately % of the diameter of the glass tube 1.

That is, in FIG. 3, if the glass tube 1 is a circle with a radius R and the center point O, the reflecting mirror 8 is located at the bottom of a circle t with a radius R, whose center P is located R/2 above the perpendicular line AB passing through the center O. It must be brought to a position corresponding to the arc.

In this case, the lowest point D of the reflecting mirror 8 is located above the lowest point of the glass tube 1 by R/2.

The positional relationship between the reflecting mirror 8 and the heat collecting pipe 2 is disclosed in, for example, Japanese Patent Laid-Open Publication No. 140932/1982.
There is no disclosure of any specific means for naturally arranging the above positional relationship.

Therefore, the present invention has a heat collecting pipe 2 and a reflector 8 inside the glass tube 1.
The object of the present invention is to provide a concrete means for easily installing the above-mentioned positional relationship.

Another object of the present invention is to facilitate the manufacture of the collector.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 4 is a sectional view of the solar heat collector of the present invention, whose glass tube 1 and heat collecting pipe 2 are the same as those shown in FIGS. 1-2.

In the figure, reference numeral 10 denotes a trough-like reflector plate disposed at the center of the glass tube 1, and its cross section forms an arc with a radius of curvature R as explained in FIG.

Since this reflecting plate 10 is for converging and reflecting sunlight to the heat collecting pipe 2, a metal plate, a mirror-treated mica plate having elasticity, or the like is used, for example.

Reference numeral 11 denotes a holding member that is fixed in the glass tube 1 and holds the heat collecting pipe 2 and the reflecting plate 10 in the positional relationship shown in FIG. 3, and is formed by welding a pair of clamping members 12 and 13. ing.

Each of the clamping members 12 and 13 is made by bending a single elastic metal plate into the shape shown in FIG.
15 is formed.

The radius of curvature of each of these elastic pieces 14 and 15 is 1
It is formed to be larger than the radius of curvature of the glass tube 1, and is rounded so that it is elastically pressed against the inner surface of the glass tube 1 when inserted into the glass tube 1.

Moreover, the flat support part 16 of this clamping member 12 has a semicircular shape having an inner diameter approximately equal to the outer diameter of the heat collecting pipe 2 at the center thereof, the vertical height of which is approximately equal to the diameter (2R) of the glass tube 1. The heat collecting pipe holding recess 17 is formed in a curved manner, and an arcuate reflecting plate holding recess 18 corresponding to the shape of the reflecting plate 1o is formed in a curved manner below R/2 of the recess 17.

Therefore, if two clamping members as shown in FIG. 5 are placed opposite each other with their supporting parts 16 as shown in FIG. 19. An arcuate reflector holding portion 20 is formed below which holds and holds the reflector 1o.

Therefore, when manufacturing a collector, first two clamping members 1 are
At step 2.13, the heat collecting pipe 2 and the reflecting plate 1o are sandwiched as shown in FIG. 4, and in this state, both supporting parts 16 are bonded together by spot welding, brazing, etc.

Then, these are press-fitted into the glass tube 1, and the opening of the glass tube is sealed with a sealing plate 4 as shown in FIG.

Note that when press-fitting, the elastic pieces 14 and 15 of the holding member 11
All you have to do is press it further with your fingers.

During press-fitting, the elastic pieces 14.15 slide on the inner surface of the glass tube 1, but the elastic pieces 14.15 are subjected to a so-called tumbler treatment so as not to damage the inner surface of the glass tube.

The holding member 11 installed inside the glass tube 1 has an elastic piece 1
4.15 on the inner surface of the glass tube, it is possible to slide in the axial direction, but it is held extremely stably in the radial direction.

However, since this holding member 11 has a width of 5 to 10m, two or more pieces are usually required to accurately hold the heat collecting pipe 2 and the reflecting plate 10 along the axial direction.
If the length of the wire is about 2 m, 3 to 4 pieces are required.

However, if the reflection plate holding part and the heat collecting pipe holding part are formed on the seal plate 4 itself shown in FIG.
Even one can hold a pipe and a reflector.

\[Other Examples] (1) The holding members 12 and 13 do not need to be particularly welded.

(2) The heat collecting pipe 2 may be welded to the holding member 11 to make the structure of the members inside the glass tube 1 more solid.

In this case, the reflecting plate 10 is preferably made slidable with respect to the holding member 11 (to prevent deformation due to thermal expansion).

Since the collector of the present invention is a stealth collector as mentioned above, simply inserting the holding member holding the heat collecting pipe and the reflecting plate into the transparent container will position the heat collecting pipe and the reflecting plate in the specified position relative to the transparent container. Not only can the collector be installed accurately, but also no special jig is required for press-fitting the holding member into the transparent container, which greatly simplifies the manufacturing process of the collector.

Moreover, when holding the heat collecting type and the reflecting plate, it is only necessary to hold them from both sides with the holding members, so the assembly work is extremely simple.

Further, since the holding member can be formed by simply bending a metal plate, it is easy to manufacture and costs can be reduced.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional collector, and Figure 2 is a-a.
The N-side view and FIG. 3 are explanatory diagrams for explaining the relationship between the heat collecting pipe and the reflecting plate, FIG. 4 is a sectional view of the collector of the present invention, and FIG. 5 is a perspective view of its clamping member. 10 is a heat collecting pipe 2 and a reflecting plate 11 (corresponding to the reflecting mirror 8)
This is a holding member that holds the parts in the positional relationship shown in FIG. Code, 1 glass tube, 2: heat collecting pipe, 10: reflector,
11: Holding member, 12.13: Clamping member, 14.15:
Elastic piece, 19: Heat collection pipe holding part, 20: Reflection plate holding part.

Claims (1)

[Scope of Claim for Utility Model Registration] ■ In a collector that includes a heat collecting pipe in a cylindrical transparent container and a reflector plate that collects sunlight on this heat collecting pipe, the heat collecting pipe is held in the central part of the transparent container. a heat collecting pipe holding part, a reflecting plate holding part located below the holding part and holding the reflecting plate, and a reflecting plate holding part inscribed in the transparent container to hold the heat collecting pipe holding part and the reflecting plate holding part in predetermined positions. A solar heat collector characterized by comprising a holding member having an elastic piece. 2. The solar collector according to claim 1, wherein a plurality of the holding members are arranged at predetermined intervals in the transparent container. 3. Utility model registration claim 1, characterized in that the holding member is divided into a pair of clamping members that form the heat collecting pipe holding part, the reflecting plate holding part, and the elastic piece by joining. The solar collector according to item 1 or 2.