JPS5930863Y2 - solar heat collector - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved structure of a solar heat collector that utilizes a so-called heat pipe effect.

A conventional solar heat collector of this type is disclosed in Japanese Patent Application Laid-Open No. 51-97839.
As disclosed in the above publication, a pipe exposed to sunlight and a heat radiating tube connected to at least one end of the pipe so as to be substantially orthogonal to the pipe and communicating with the inside of the pipe are provided, and the heat radiating tube is A liquid pipe passes through the pipe coaxially with the cylinder, reducing the pressure inside the pipe and the heat radiation cylinder, and sealing the working fluid, so if there is not enough space between the heat radiation cylinder and the liquid pipe, the surface tension Due to this action, the liquid phase heat medium remained attached between the heat radiating cylinder and the liquid tube, and the liquid phase heat medium could not be smoothly returned from the heat radiating section to the heat absorbing section.

This phenomenon is particularly noticeable when fins are attached to the outer periphery of the liquid pipe, and the heat collection efficiency decreases.

In view of the above-mentioned facts, this idea is designed to quickly return the working fluid that has changed from the gas phase to the liquid phase in the heat radiation part to the heat absorption part even if there is not enough space between the heat radiation tube and the liquid pipe.
The purpose is to improve heat collection efficiency.

In this device, the liquid pipe is inserted into the heat dissipation cylinder in the axial direction of the cylinder and eccentrically upward, thereby widening the gap between the lower part of the liquid pipe and the heat dissipation cylinder, and allowing the liquid to condense into a liquid phase. The liquid was made to be less susceptible to the effects of surface tension.

Hereinafter, one embodiment will be described with reference to the drawings. Reference numeral 1 is a pipe bent into a U-shape, and a heat collecting plate 2 is attached in a heat transfer manner to constitute a heat absorbing portion 1a exposed to sunlight.

Reference numeral 3 denotes a heat dissipation tube connected to both ends of the pipe 1 so as to be substantially orthogonal to the pipe so that the inside communicates with the inside of the pipe, and the pipe 1 is slightly bent so as to be at a position higher than the heat absorption section 1a.

Reference numeral 4 denotes a liquid pipe which penetrates the heat dissipation cylinder 3 in the axial direction and eccentrically upward, and uses a so-called low-fin pipe in which a large number of fins 4' are formed integrally with the liquid pipe in the circumferential direction.

The liquid pipe 4 and the heat dissipation tube 3 are narrowed down to both ends of the heat dissipation tube 3.
The fins 4' are brought into contact with each other, and the abutting portions are brazed 5.

Reference numeral 6 denotes an exhaust tip tube attached to the top of the heat dissipation tube 3, and the tip tube 6 is used to reduce the pressure inside the heat dissipation tube 3 and the pipe 1.
In addition, a working fluid such as Freon water or acetone is sealed.

Therefore, the heat radiation tube 3 and the pipe 1 have the function of a heat pipe, the pipe 1 of the heat collecting plate 2 portion serves as the heat absorption part 1a, and the heat radiation tube 3 serves as the heat radiation part.

When the heat absorption part 1a is heated by sunlight, the pipe 1
The liquid-phase working fluid inside evaporates and moves into the heat sink 3, and the liquid pipe 4
It is condensed into a liquid phase by a heating medium such as water flowing through it, and the heating medium is heated.

The liquid-phase working fluid falls along the fins 4' and moves to the heat absorbing section 1a, where it is heated by sunlight again, repeating the cycle to heat the heat medium.

When such a cycle is carried out in a short time, heat transfer is faster and heat collection efficiency is improved.

To achieve this, it is necessary to quickly return the working fluid that has changed from the gas phase to the liquid phase in the heat radiation part to the heat absorption part.

However, since the distance between the heat sink 3 and the liquid pipe 4 is only 1 to 2 mm, especially when the loaf-in 4' is attached, the liquid phase working fluid flows between the many fins and between the heat sink 3 and the liquid pipe 4. Due to the surface tension between them, they remain attached, and the flow back to the heat absorbing part 1a is not carried out smoothly.

In the present invention, as mentioned above, by making the liquid pipe 4 eccentric upward, the distance between the lower part of the liquid pipe 4 and the heat radiation tube 3, that is, the distance between the communicating portion 7 between the pipe 1 and the heat radiation tube 3, is widened, which prevents condensation. The working fluid that has become a liquid phase is not easily affected by surface tension and is immediately refluxed to the heat absorption part 1a, so the cycle of liquid phase - gas phase - liquid phase is carried out in a short time, and as a result, the heat collection efficiency is improved. will improve.

Particularly, when fins are provided on the outer periphery of the liquid pipe, a remarkable effect is produced.

[Brief explanation of the drawing]

The figures are all of the present invention; FIG. 1 is a perspective view, FIG. 2 is a sectional view of the main part, and FIG. 3 is an enlarged sectional view of the main part. 1... Pipe, 3... Heat sink, 4...
...liquid pipe, 4'...fin.

Claims (2)

[Scope of utility model registration request] (1) A pipe exposed to sunlight and a heat dissipation tube connected to at least one end of the pipe so as to be substantially perpendicular to the pipe so that the inside communicates with the inside of the pipe are provided, and the inside of the heat dissipation tube is disposed in the axial direction of the tube. A solar heat collector in which a liquid pipe is inserted eccentrically upward, the pressure inside the pipe and the heat radiation cylinder is reduced, and a working liquid is sealed. (2) The solar heat collector as described in the preceding item, which includes a large number of fins provided on the outer periphery of the liquid pipe.