JPS6240628B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solar collector that prevents damage to heat pipes due to overheating.

A vacuum tube type solar collector has a high heat collection efficiency, in which a heat collecting part of a heat pipe is housed in a vacuum tube made of a transparent material to collect solar radiation heat and heat a liquid to be heated with the heat radiating part of the heat pipe. There is. However, in such solar collectors, if the heat pipe is left without sufficient supply of heated liquid to the heat dissipation part, the heat pipe will overheat, causing deterioration of the working fluid sealed inside and damage to the pipe itself. There is a risk that the function as a solar collector may be lost due to damage to the solar heat collector.

The present invention, which was made in view of the above, provides a heat dissipation section of a vacuum tube type solar collector using a heat pipe.
The main purpose is to prevent or control the boiling of the heated liquid and to suppress the decomposition of the working fluid sealed in the heat pipe, and will be explained below with reference to the drawings.

1 is a heat pipe which has a heat collecting part 1a and a heat radiating part 1b and has a working fluid (for example, fluorocarbon) sealed inside. The heat collected by the heat pump is given to supply heat to a hot water supply or an air conditioning load 3. 4 is a circulation pump for the liquid to be heated, 5 is a heat storage tank, and 6 is a casing.

The heat collecting section 1a of the heat pipe 1 has a heat collecting plate 7 with a selective absorption film formed on its surface, and a vacuum tube 8 made of a transparent material such as glass that allows sunlight to pass through. On the other hand, the heat dissipating section 1b protrudes through a metal end plate 10 sealed with a fritted glass 9 at the opening of the vacuum tube 8, and is inserted into the casing 6. Heat dissipation plates 11 and 12 are fixed.
Reference numeral 13 denotes a flexible portion provided in the vicinity of the heat radiating portion 1b of the heat pipe 1, and the heat pipe itself can be bent at the flexible portion 13, thereby making the heat radiating portion 1b movable. 1
Reference numerals 4 and 15 denote a pair of heat transfer plates placed opposite each other in the casing 6 with the heat pipe heat dissipation section 1b in between, and a liquid pipe 2 is brazed to the back surface of one of the heat transfer plates 15. The other heat transfer plate 14 has an inclined lower surface to facilitate surface contact with the upper heat dissipation plate 11 of the heat pipe 1, and has an upper surface protruding outside the casing 6 to form a heat dissipation member 1 consisting of a large number of heat dissipation fins.
6 is installed. 17 has one end fixed to the end plate 10 of the vacuum tube 8 and the other end fixed to the heat radiating part 1b, thereby forming the heat radiating part 1.
This is a thermally responsive element made of a bimetallic plate that is deformed by the heat of b. Due to the thermal deformation of this element 17, the heat dissipation part 1b of the heat pipe moves between the pair of heat transfer plates 14 and 15 around the flexible part 13. It can be freely attached and detached.

Normally, the liquid to be heated flows through the liquid pipe 2 by the circulation pump 4, and the thermally responsive element 17 moves the heat radiating part 1b of the heat pipe when the heat radiating part 1b is at normal temperature.
is brought into contact with the heat transfer plate 15 on the liquid tube 2 side. (See Figure 3) Therefore, when the heat collecting part 1a is heated by sunlight, the working fluid evaporates and is moved to the heat radiating part 1b, where latent heat is released and the lower heat radiating plate 12 and the heat transfer plate 15 are heated. The liquid to be heated is heated through the liquid.

On the other hand, if the liquid to be heated is not circulated due to a power outage or some kind of failure, the heat dissipation section 1b of the heat pipe 1 will be in an unloaded state and overheat. Then, the thermally responsive element 17 senses the heat of the heat radiation part 1b and deforms. With this deformation, the heat dissipation part is bent around the flexible part 13, and the upper heat dissipation plate 11 attached to the heat dissipation part 1b comes into contact with the upper heat transfer plate 14, so that the heat of the heat pipe heat dissipation part is transferred. Heat dissipation member 16 via plate 14
is dissipated into the atmosphere, preventing abnormal heating of the heat pipe.

As described above, the present invention can prevent the reduction in the transmission effect of the heat pipe due to overheating of the heat pipe and the accompanying decomposition and deterioration of the working fluid.

[Brief explanation of the drawing]

The figures are all of the present invention; Figure 1 is a perspective view;
FIG. 2 is an exploded perspective view of essential parts, and FIGS. 3 and 4 are sectional views showing different aspects. 1a...Heat collection part, 1b...Heat radiation part, 1...Heat pipe, 8...Vacuum tube, 2...Liquid pipe, 14,1
5... Heat transfer plate, 13... Flexible part, 17... Thermal response element.

Claims (1)

[Claims] 1. A heat pipe has a heat collecting part and a heat radiating part, and has a working fluid sealed inside. The heat collecting part of the heat pipe is housed in a vacuum tube made of a transparent material, and the liquid to be heated is heated by the heat radiating part. In this system, a pair of heat transfer plates are placed opposite each other with the heat dissipation part of the heat pipe in between, and one heat transfer plate has a liquid pipe attached to it, and the other heat transfer plate has a heat dissipation member that dissipates heat to the atmosphere. At the same time, a flexible part is provided near the heat dissipation part of the heat pipe so that the heat pipe itself can bend freely, and the heat dissipation part is connected to and separated from the pair of heat transfer plates by a thermally responsive element that is deformed by the heat of the heat dissipation part. A solar collector that is characterized by being flexible.