JPS629485Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a solar collector. More specifically, the present invention relates to a heat pipe type solar collector that uses a heat pipe as a heat collecting member and has improved safety in the event of a heat pipe abnormality.

Conventionally, heat pipe type solar collectors use one end (heat supply end) of the heat pipe as a heat exchange section. It is often a large shape. Normally, for this purpose, a separate heat supply end 2 that can fit into the container tube 3 of the heat pipe is processed, and each is joined and integrated by means such as brazing. Specifically, since the pipe diameters of the container pipe 3 and the heat supply end 2 are significantly different, a sleeve 6 is extended to one of the container pipe 3 and the heat supply end 2 as an extension pipe into which these can be fitted. It is a common practice to fit these together through the sleeve and then integrate them by brazing at the sleeve end 5'.

On the other hand, a working fluid such as water, Freon, or alcohol is hermetically injected into the heat pipe of a heat pipe type solar collector under vacuum, and it is activated when the heat receiving end 10 rises in temperature due to heat input from outside such as solar heat. The liquid evaporates and rises all at once to the heat supply end 2, gives heat to the heat medium such as water in contact with the heat supply end 2, liquefies itself on the inner wall surface of the heat supply end, and drips again to the heat reception end 10. We take a cycle of doing this. However, when an abnormally large heat input occurs, the amount of evaporation of the working fluid naturally becomes abnormal, and the pressure inside the heat pipe increases abnormally. This is the situation when dry firing under so-called abnormally high solar radiation, but if the wall thickness of the heat pipe container tube is insufficient or there is a partial defect in the material, the heat pipe will end up leaking from an unspecified part of the heat pipe. This can lead to rupture, which is very dangerous. For example, if a container pipe ruptures at the heat-receiving end, the shock could also damage the glass tube in the jacket, and there is a risk that these fragments could in turn damage the jackets of other adjacent solar collectors. It was hot.

This invention was made to solve these problems.

In view of the above points, the inventors of this device intentionally created partial defects in specific positions of the heat pipe container pipe system, especially in the mating parts.
We discovered the fact that a heat pipe type solar collector with improved safety can be obtained and arrived at this idea.

Thus, according to this invention, a fitting extension pipe is extended to either the heat supply end of the heat pipe and the container pipe, and the heat supply end and the container pipe are fitted together through the extension pipe. A heat pipe type solar collector comprising: a heat pipe type solar collector, characterized in that at least one crack is provided in a portion corresponding to the outer tube of the fitting portion between the heat supply end and the container tube in parallel to the tube axis direction. A heat pipe type solar collector is provided.

This invention will be explained in detail below with reference to the accompanying drawings. FIG. 4 is a perspective view showing a specific example of the heat pipe type solar collector of this invention, and FIG.
It is a partially enlarged perspective view mainly showing part A in the figure.
In FIG. 4, the solar collector of this invention consists of a heat-supplying end 2 and a container pipe 3 of a heat pipe that are fitted and integrated, and a glass tube jacket 9 that vacuum insulates the heat-receiving end 10 of the heat pipe. It is configured. Note that a heat collecting plate 8 is attached to the heat receiving end 10 for thermal conduction. As shown in FIG. 4, the heat supply end 2 and the container pipe 3 are connected parallel to the tube axis direction from the heat supply end 2 as a portion corresponding to the outer pipe of the fitting portion 4.
A sleeve 6 having two slits 7 is extended as shown in FIG. 6, and the container pipe 3 is fitted into the sleeve 6. By brazing the peripheral portion 5 of the sleeve 6 including the crack 7, the heat supply end 2 and the container pipe 3 are integrated.

In the above configuration, if an abnormal increase in pressure occurs inside the container tube of the heat pipe, the brazed part of the sleeve 6 at the crack 7 has the weakest mechanical strength, so it will tear from the crack 7 and the brazing will peel off, releasing the internal pressure to the outside. open to Normally, this part is housed in a protective box filled with heat insulating material, so there is no risk of the internal hydraulic fluid scattering and causing secondary damage, and of course there is no risk of damaging the glass outer cover 9. Nor.

In this invention, it is preferable to use the sleeve 6 extending from the heat supply end with a large diameter pipe as in the above-mentioned specific example as the fitting fitting pipe.
As long as the shape of the protruding tube can be fitted in any other shape, shapes with various diameters can be applied to the heat supply end portion or the container tube, regardless of whether it is for internal or external fitting. When a sleeve as shown in the specific example is provided at the heat supply end, it is preferable that the diameter of the sleeve is about half of the pipe diameter of the heat supply end. Note that various materials known in the art can be used for the material, thickness, etc. of the extension pipe.

In this invention, at least one cleft is provided in a portion corresponding to the outer tube of the fitting portion that is fitted via the extension tube. It is appropriate to create this fissure by cutting it out parallel to the tube axis, usually in a V-shape or U-shape. Further, the depth of this notch is usually approximately 3/4 of the length of the fitting portion in the axial direction. The number of cracks and their width are not particularly limited, as they vary depending on various conditions such as the inner diameter and thickness of the applied container pipe and the heat supply end. It is sufficient if one is provided.

The fitted heat supply end and container pipe are usually integrated by brazing or the like. In this case, it is preferable to braze the periphery and the crevice of the outer tube equivalent portion of the fitting portion to integrate them. If the entire contact surface of the fitting part is brazed, the joint strength of this part will increase too much, which is not preferable.

As mentioned above, the thus obtained heat pipe type solar collector of this invention has higher safety than conventional ones and can be suitably used in various solar heat utilization systems.

[Brief explanation of drawings]

1 and 2 are perspective views showing an example of a conventional heat pipe type solar collector, respectively, and FIG. 3 is a partially enlarged perspective view mainly showing part A in FIG. 1. FIG. 4 is a perspective view showing a specific example of the heat pipe type solar collector of this invention, FIG. 5 is a partially enlarged perspective view mainly showing part A in FIG. 4, and FIG. 5 is a view corresponding to FIG. 5 showing an example of the fitting outlet pipe of this invention. DESCRIPTION OF SYMBOLS 1, 1'... Heat pipe type solar collector, 2... Heat supply end, 3... Container pipe, 4... Fitting part, 5... Periphery of the portion corresponding to the outer tube, 6... Sleeve, 7... Crack, 8 …
Heat collecting plate, 9... Outer covering, 10... Heat receiving end, 11... Heat medium pipe.

Claims (1)

[Scope of utility model registration request] A heat pipe solar panel comprising a fitting fitting extension pipe extending from either the heat supply end of the heat pipe and the container pipe, and fitting and integrating the heat supply end and the container pipe through the extension pipe. A heat pipe type solar heat collector, characterized in that at least one crack is provided in a portion corresponding to the outer tube of the fitting portion between the heat supply end and the container tube in parallel to the tube axis direction. vessel.