JPS608602Y2 - solar heat collector - Google Patents

Description

[Detailed description of the invention] This invention is a solar heat collector that houses a heat collecting tube in which a heat collecting plate for collecting solar heat is bonded to a translucent vacuum glass tube. It relates to a device that performs stopping.

As a solar heat collector, a heat collection tube through which water passes and a heat collection plate are integrally joined and housed in a glass tube, and a vacuum layer is formed by drawing a vacuum inside the glass tube to prevent heat loss due to convection and conduction. Vacuum glass tube solar heat collectors are known that are designed to achieve high heat collection efficiency.

The basic structure of such a vacuum glass tube solar heat collector is shown in FIG.

In the figure, 1 is a long translucent glass outer tube with a length of, for example, 2 to 3 rrL, 2 is a copper heat collecting tube housed inside the glass outer tube, and 3 is integrated into the heat collecting tube 2 for good heat conduction. The heat collecting plate 3 is made of bonded aluminum and is caulked so as to surround the heat collecting pipe 2.

4 is a support for supporting the heat collecting tube 2 coaxially with the glass outer tube 1; 5 is an end plate that closes the open end surface of the glass outer tube 1; the inside of the glass outer tube 1 is evacuated.

When such a solar heat collector is dry-fired (heated by the sun with no heat medium flowing through the heat collecting tubes), there is no copper between the copper heat collecting tubes 2 and the aluminum heat collecting plates 3. Since aluminum has a larger coefficient of thermal expansion, the following problems arise.

In other words, 1) the joint between the heat collecting tube 2 and the heat collecting plate 3 may become loose and the heat collecting plate 3 may freely rotate around the heat collecting tube 2, and 2) heat may be collected in the tube axis direction. Plate 3 stretches by the difference in thermal expansion, but it does not necessarily stretch equally on the left and right, and in some cases, it stretches in only one direction, and due to repeated cycles of dry firing - normal temperature - empty firing - normal temperature, the position of the heat collecting plate becomes wider than its original position. A problem arises in that there is a possibility of deviation.

In order to prevent the above-mentioned problem, conventionally, two metal fittings 6 were used to attach the heat collecting plate 3 in the shape shown in the perspective view of FIG. 1 at both ends of the heat collecting plate 3 as shown in FIG.

The details of this attachment are shown in FIGS. 3 and 4, where FIG. 3 is a sectional view taken along the P arrow in FIG. 1, and FIG. 4 is a sectional view taken along the Q arrow in FIG.

In this installation, the metal fitting 6 is mounted so that the heat collecting pipe 2 is sandwiched between the metal fitting 6 and the heat collecting plate 3, and a distance l is maintained between the bent part 6a of the metal fitting 6 and the end surface of the heat collecting plate 3. The heat collecting tube 2 is brazed to the heat collecting tube 2 at a point 6b on the opposite side using a solder 7.

In this mounting, the metal fittings 6 are effective in preventing the heat collecting plate 3 from rotating by sandwiching the heat collecting tubes 2, but the effect of preventing slippage is small.

That is, since the fittings 6 are attached to the ends of the heat collecting plate 3, the fittings 6 also move due to thermal expansion of the heat collecting plate 3.

The object of this invention is to eliminate the above-mentioned drawbacks, to provide a device that can reliably prevent rotation and slippage and has a simple structure.

According to the present invention, this purpose is to straddle adjacent heat collecting plates, and the mounting which is disposed with the heat collecting pipe sandwiched between the heat collecting plates has metal fittings, and the fittings are connected to the heat collecting pipes respectively. This is achieved by configuring it to be joined to a heat collecting plate.

Next, an embodiment of this invention will be described in detail based on the drawings.

Fig. 5 is a sectional view showing the basic structure of a solar heat collector which is an embodiment of this invention, Fig. 6 is a perspective view of the mounting bracket which is the main part of this invention, and Fig. 7 is the same as that shown in Fig. 5. The mounting seen from the bottom is shown in the figure, and FIG. 8 is a side view of FIG. 7 seen from the side.

In FIG. 5, the same parts as in FIG. 1 are given the same reference numerals, and the difference in FIG. 5 from FIG.
The metal fittings 16 are used to straddle the parts.

For this installation, the metal fitting 16 has a slight depression 1 in the center of the rectangular flat plate to match the outer periphery of the heat collecting tube, as shown in the enlarged view in Fig. 6.
6a, and a plurality of rivet holes 16b.

In this installation, the installation position of the metal fitting 16 is a portion spanning the adjacent heat collecting plates 13, as shown in FIG. 5, and one metal fitting is installed at that location.

As shown in FIGS. 7 and 8, the connection to the heat collecting tube 12 is brazed with solder 17, and the connection to the heat collecting plate 13 is caulked with rivets 18.

According to the above-mentioned structure of the present invention, it is only necessary to use a metal fitting at one location approximately in the center across adjacent heat collecting plates, and the heat collecting plate is connected to the metal fittings by sandwiching the heat collecting pipes. Therefore, it has the effect of preventing rotation, and since the thermal expansion of the heat collecting plate is fixed at the center, the direction of expansion is constant, which is effective in preventing displacement, and has the advantage that it can be simplified.

In this way, the heat collector plates expand due to expansion, but since the center is fixed with a metal fitting, the heat collectors expand symmetrically, and when multiple heat collectors are placed in parallel, it is difficult to align the positions of the heat collector plates. It also has the advantage of being able to be used without damaging the aesthetic appearance.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional solar heat collector, Fig. 2 is a perspective view of the mounting fittings shown in Fig. 1, Fig. 3 is a sectional view taken along the P arrow in Fig. 1, and Fig. 4 1 is a sectional view taken in the direction of the Q arrow in FIG. 1, FIG. 7 is a diagram showing the attachment of the metal fittings as seen from the back side of FIG. 5, and FIG. 8 is a side view of FIG. 7 as seen from the side. 1 glass outer tube, 12: heat collection tube, 13: heat collection plate, 16:
Installation is with metal fittings, 17: wax, 18: rivets.

Claims (1)

[Scope of utility model registration request] A heat collecting tube is housed coaxially within a translucent glass outer tube, and a heat collecting plate is bonded to the heat collecting tube, and the heat collecting tube is sandwiched between the heat collecting plate and the adjacent heat collecting plate. A solar heat collector characterized in that the mountings arranged in the solar heat collector have metal fittings, and the metal fittings are joined to the heat collecting pipe and the heat collecting plate, respectively.