JPS6028906Y2 - solar heat collector - Google Patents

Description

[Detailed explanation of the invention] This invention houses a heating medium tube inside a translucent vacuum glass tube.
The present invention relates to a solar heat collector in which the heat medium tube is supported on the inner wall of the glass tube via a support, and particularly to the support structure.

As a solar heat collector, a heat medium tube through which a heat medium passes is housed coaxially within a glass tube, and a vacuum layer is formed around the heat medium tube to prevent heat loss due to convection and conduction, resulting in high heat collection efficiency. Vacuum glass tube type solar collectors designed to obtain the following are known.

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

In the figure, 1 is a long translucent glass tube with a length of, for example, 2 to 3 rrL, and 2 is a heat medium tube housed inside the glass tube 1. This heat medium tube 2 is made of, for example, a double layer made of copper. The pipe structure is formed by forming an outward path and a return path for the heat medium in the tube, and is sealed to the glass tube 1 at the open end surface of the glass tube 1 via a cylindrical connecting tube 3 and a funnel-shaped connecting fitting 4. .

A heat medium pipe that passes through the funnel-shaped retaining fitting 4 and projects outward is connected to a heat medium circulation system (not shown).

The other free end of the heat medium tube 2 is supported by a support 5 on the inner wall of the glass tube on the closed side of the glass tube 1.

The inside of the glass tube 1 is vacuum sealed to form a vacuum layer 6.

By the way, when assembling and configuring the vacuum glass tube type solar heat collector, the heat medium tube 2 is held in a coaxial position within the glass tube 1 over its entire length, also from the viewpoint of heat collection efficiency. It is necessary.

Therefore, as mentioned above, one side of the heat medium tube 2 is fixedly supported by the connecting fitting, and the other side is connected to the glass tube 1 through the support.
In this case, what must be considered for the support is the heat transfer between the heat medium tube 2 and the glass tube 1.

That is, even if a vacuum layer 6 is formed around the heat medium tube 2 in the glass tube 1 to block heat, there is a heat transfer path between the heat medium tube 1 and the glass tube 1 that allows heat to easily escape due to the support of the heat medium tube. If it is formed, heat loss will be large.

Next, when the heat transfer tube is supported on the inner wall of the glass tube by a support, it must be supported in a fixed manner in the radial direction, but it must be supported in a slidable manner in the tube axis direction. Must be.

This is because the heat medium tube expands and contracts due to thermal expansion when it is exposed to sunlight and receives heat and when it does not receive heat from sunlight, such as at night.

The present invention was devised in view of the above points, and its purpose is to provide a solar collector with improved heat collection efficiency by improving the support performance and heat conductivity of the support.

In order to achieve the above objective, the heat medium tubes were supported as follows.

That is, an elastic band-like member with low thermal conductivity is bent to form a small-diameter arcuate portion on the inside and a large-diameter curved portion on the outside, and the outer circumferential surface of the heat medium tube is fitted into the small-diameter arcuate portion. It was supported on the inner wall of the glass tube at four locations: the tip of the large-diameter curved portion and projections provided on both sides.

Examples of this invention will be described below based on the drawings.

Figure 2 is a cross-sectional view of the vacuum glass tube of the solar heat collector of this invention, Figure 3 is a cross-sectional view of the support used in the solar collector, and Figure 4 is a side view of the support. .

The support 15 that is inside the vacuum glass tube 1 of this solar heat collector and supports the heat medium tube 2 has relatively low heat conductivity and is made of a thin strip of stainless steel, for example, which has good spring characteristics and is bent. A small-diameter arcuate portion 15a is formed on the inside, a large-diameter curved portion 15b is formed on the outside, and a protrusion 15c is formed on the side surface of the large-diameter curved portion 15b.
will be established.

In order to support the heat medium tube 2 with this support body 15, the small diameter arcuate portion 15a is fitted into the outer periphery of the heat medium tube 2, and the glass tube 1 is connected to the image tip 15d of the large diameter curved portion 15b and the circumferential protrusion 15c. It was made to make line contact with the inner wall of the glass tube at four locations.

The support structure according to the present invention described above is bent and formed using an elastic band-like member with low thermal conductivity, and has a shape that minimizes the contact area with the inner wall of the glass tube, so heat loss due to thermal conduction is minimized. Moreover, the heat medium tube can be supported almost at the center of the glass tube, improving heat collection efficiency.

Furthermore, expansion and contraction due to thermal expansion in the axial direction of the heat medium tube was completely absorbed by allowing the support to freely slide on the inner surface of the glass tube.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing the basic structure of the vacuum glass tube section of a solar heat collector, Fig. 2 is a cross-sectional view of the vacuum glass tube section of a solar heat collector that is an embodiment of this invention, and Fig. 3 4 is a cross-sectional view of a support used in the above heat collector, and FIG. 4 is a side view of the same support. 1: Vacuum glass tube, 2: Heat medium tube, 15: Support, 15a
: Small diameter arcuate portion, 15b: Large diameter curved portion, 15c: Projection, 1
5d: Tip.

Claims (1)

[Scope of utility model registration request] A heat transfer tube is housed coaxially inside a transparent vacuum glass tube.
One side of the heat medium tube is fixedly supported by the glass tube via a connecting fitting, and the other free end of the heat medium tube is supported by a support on the inner wall of the glass tube; the support A small diameter arc part is placed inside the elastic band material.
It is constructed by bending it to form a large diameter curved part on the outside,
The small diameter arcuate portion is fitted onto the outer circumferential surface of the heat medium tube, and the tip of the large diameter curved portion and projections provided on both sides thereof are brought into contact with the inner wall of the glass tube to support the heat medium tube. A solar heat collector characterized by: