JPS5971948A - Solar heat collector - Google Patents

Abstract

PURPOSE:To obtain a solar heat collector which can be assembled and installed with ease, by making a heat collecting element having a tubular heating-medium passage through which a heating medium is passed to absorb solar heat and a frame surrounding the side portions of the solar heat collector in a unitary manner by use of a heat-resisting synthetic resin. CONSTITUTION:An upper plate 5 is forcedly fitted into and fixed dirmly in a groove 4 formed in a frame B of a heat collecting box consisting of a heat collecting element A, the frame B and a heat exchanger tube C while slightly expanding the frame B from upward. Further, after inserting a heat insulating member 8 from downward, a bottom plate 7 is forcedly fitted into a groove 6 and fixed firmly therein while slightly expanding the frame B from downward. Then, a heating medium is charged hermetically into a tubular heating-medium passage (a) of the heat collecting element A. By installing the solar heat collector such that the side where the heat exchanger tube C is disposed is higher than the other side of the solar heat collector, the heating medium heated while passing through the heat collecting element A flows upward through a heat-absorbing, ascending section (a1) by way of natural circulation and is carried to a heat exchanging section (a2). At the heat exchanging section (a2), the temperature of the heating medium is lowered by imparting heat to a low-temperature liquid to be heated that is passed through the inside of the heat exchanger tube C, and the heating medium thus cooled is carried to the lower end portion of the heat absorbing section (a1) via a descending return section (a3).

Description

[Detailed description of the invention] Technical fields> The present invention relates to a flat plate type solar heat collector.

Conventional technology A conventional flat-plate solar heat collector consists of a rectangular bottom plate made of an extruded product such as an aluminum alloy, and four vertical side plates on the four sides of the bottom plate, which are joined to form a top-open type heat collecting box. A metal heat medium distribution pipe that collects solar heat by distributing a heat medium while inserting a heat insulating material into the heat collection box;
A heat collector consisting of a solar heat absorbing metal heat collecting plate fitted and fixed to this distribution pipe is placed and fixed, and the top opening of the heat collecting box is sealed with a top cover made of a transparent glass plate. there were. Therefore, the work of assembling this flat solar heat collector is complicated and expensive. Furthermore, solar heat collectors are large and heavy, making them difficult to install on the roofs of houses.

<Objective> In order to eliminate the above-mentioned conventional drawbacks, the present invention aims to provide a small, lightweight, and inexpensive solar heat collector that is easy to assemble and install.

<Embodiments> Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 8. The present solar heat collector has a heat medium tubular passage a through which a heat medium flows so as to absorb solar heat. The body A and a frame B surrounding the sides of the heat medium tubular passage a are integrally formed of heat-resistant synthetic resin.

As the heat-resistant synthetic resin of the frame B, for example, black high-density polyethylene resin, polypropylene resin, etc. are used. The hollow structure B is formed by a known blowing process.The cross section of the heat collector A is flat and has a rough surface so that heat absorption is good. As shown in Fig. 4, the medium tubular passage a consists of a meandering heat absorption rising portion a1 that occupies most of the area, a heat exchange portion a2 continuously formed at the upper right end, and a heat absorption rising portion a1 from the left end.
1. It is composed of a return descending portion a3 that is continuously formed toward the lower left end of the ascending portion a1.

Further, C is a heat exchange cylinder made of metal and equipped with one spiral heat absorption fin and inserted into the heat exchange part a2. At that time, it is assembled into a mold in advance and integrally molded with the heat collector A and the frame B. The left end 1 opened on the outer surface of the frame B of the heat exchange cylinder C
b is the inlet of the liquid to be heated, and the right end 1c is the outlet thereof. 2,3
is a joint between heat collector A and frame B, which absorbs thermal expansion and contraction of heat collector A, and one joint 3 also has a heat insulating function due to the air layer inside. Reference numeral 4 denotes a top plate fitting groove formed on the upper part of the inner surface of the frame body B, into which a transparent heat-resistant synthetic resin face plate 5 (having a hollow structure) is fitted and fixed. With the bottom plate fitting groove formed at the bottom of the inner surface,
A synthetic resin bottom plate 6 is fitted and fixed to this, and this bottom plate 7
A heat insulating material 8 made of a low-expanded styrene resin is interposed between the heat collector A and the heat collector A, and mounting flanges 9 and 10 with a pair of upper and lower holes 8 are protruded from the left and right outer surfaces of the frame B, which has a hollow rectangular cross section. By vertically shifting the mounting collar 9 on the left and the mounting collar 10 on the right, adjacent solar heat collectors S
The mounting flanges 9 and 10 of the same type are configured to fit into each other. Note that the bottom plate 7 and the heat insulating material 8 may be integrally molded.

Next, to explain the assembly work of the above solar heat collector, firstly, the heat collection box (fourth to
With respect to the frame B (state shown in Fig. 7), spread it out a little from one side, push in the top plate 5, and fit and fix it into the groove 4. Next, the heat insulating material 8 is inserted into the frame B from below, the frame B is slightly expanded from below, the bottom plate 7 is pushed in, and the bottom plate 7 is fitted into the groove 6 and fixed.

Next, to explain the function of the solar heat collector, heat collector A
A heating medium is sealed in the heating medium tubular passage a by an appropriate method. If the solar heat collector is installed with the side where the heat exchange cylinder C is raised, the heat medium heated through the heat collector A will be absorbed by the heat of the heat collector A as shown by the arrow Y1 in Fig. 8. The heat-absorbing rising portion a1 of the medium tubular passage a rises through natural circulation to reach the heat exchange portion a2. Here, move inside the heat exchange cylinder C from arrow Z1 to arrow Z.
As shown in 2, the heating medium exchanges heat with the flowing low-temperature liquid to be heated and becomes low temperature. As shown by arrow Y2, the heating medium passes through the return descending section a3 and flows into the lower end of the endothermic rising section a1, where it is heated by solar heat again. The endothermic rising portion a1 is raised to the heat exchange portion a2.

As this process is repeated, the heated liquid in the heat exchange tube C gradually becomes hotter.

In addition, to explain the installation method, as shown in Figs. 9 and 10, the mounting flanges 9 and 10 on the left and right sides of the frame B at about side 11 of the solar heat collector S are connected to the mounting flanges of the adjacent solar heat collector S. In a mutually fitted state, each mounting collar is fixed to the pedestal 4-D using its hole 8 and screw E. By such a method, as shown in FIG. 11, a plurality of solar heat collectors S can be installed by connecting their heat exchange tubes C with piping F as necessary. In other words, the solar heat collectors S are arranged in two series and two parallel as shown in (a) of the same figure, the solar heat collectors S are arranged in two series and three parallel as shown in the figure (1)), and the solar heat collectors S are arranged in two series and three parallel as shown in the figure (C). The solar heat collectors S are arranged in four parallels as shown in the figure (d), the solar heat collectors S are arranged in six parallels as shown in the figure (e), and the solar heat collectors S are arranged in six parallels as shown in the figure (e). f
), nine solar heat collectors S are installed in parallel.

In addition, although the example using the heat exchange tube C was explained above,
The present invention can also be applied to a type without a heat exchange cylinder. For example, by continuously supplying the liquid to be heated to the lower part of the heat medium tubular passage a,
It can also be applied to a type in which the heated liquid is continuously discharged from the upper part of the heat medium tubular passage a.

<Effects> As is clear from the above description, the solar heat collector of the present invention includes a heat collector having a heat medium tubular passage through which a heat medium flows so as to absorb solar heat, and a heat medium on the side of the heat medium tubular passage. A frame body surrounding both sides is integrally formed of heat-resistant synthetic resin.

According to the present invention, it is possible to provide a small, lightweight, and inexpensive solar heat collector that does not require the assembly work of the heat collector and the frame, and has excellent assembly and installation workability.

Furthermore, if the present invention is configured such that the top plate and the bottom plate are fitted and fixed to the frame as in the illustrated embodiment, the entire assembly can be assembled without using fasteners such as screws, which improves workability. Tortures in one layer direction -1-.

[Brief explanation of the drawing]

The drawing shows an embodiment of the solar heat collector of the present invention.
The figure is a partially cutaway perspective view, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a sectional view taken along the line ■-■ in Figure 1.
Figure 4 is a cross-sectional plan view of the main part, Figure 5 is a cross-sectional view taken along the line ■-V in Figure 4, Figure 6 is a cross-sectional view taken along the line ■-■ in Figure 4, and Figure 7 is a cross-sectional view taken along the line ■--■ in Figure 4. Fig. 4 is a cross-sectional view taken along the line Cross-sectional view along
FIGS. 11(a) to 11(f) are plan views 7-7 for explaining the installation method. . A: heat collector, B: frame, C: heat exchange cylinder, a: heat medium tubular passage, al: heat absorption rising section, a2: heat exchange section, a3: return descending section, 2, 3: joint piece, 5 :Top plate, 4°6, :
Fitting groove, 7: Bottom plate. Applicant Sharp Co., Ltd. Agent Tsunehisa Nakamura-8 = JP-A-59-71948 (5)

Claims (1)

[Claims] A heat collector having a heat medium tubular passage through which the heat medium flows so as to absorb solar heat, and a frame body surrounding the sides of the heat medium tubular passage are integrally formed of a heat-resistant synthetic resin. Solar heat collector.