JPS608273Y2 - solar collector - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a solar collector using a gravity heat pipe.

The conventional solar collector of this kind is Utility Model No. 127741 (1977).
As disclosed in the publication, a plurality of flat pipes are provided between two parallel pipes and communicate with the two parallel pipes,
The inside of this pipe is depressurized and the working fluid is sealed in the heat pipe.A heat-radiating part is formed by providing a pipe body for heat-absorbing medium to flow through one of the parallel pipes, and a heat-receiving plate is attached to the flat pipe to form the heat-receiving part. Formed objects, JP-A-52-1409
As disclosed in Publication No. 31, it consists of a U-shaped heat collection pipe that is heated by solar heat and a heat storage tank that is installed above the heat collection pipe and is hermetically connected to it, and a heat medium is sealed after deaeration. The heating medium in the heat collection pipe is heated by solar heat and rises to the heat storage tank in a boiling state, and the solar heat stored in the heat storage tank is heated. It is known to heat water flowing through heat exchange pipes.

However, these solar collectors have a heat absorption section consisting of multiple pipes with heat pipes arranged on a common heat receiving plate (heat collecting plate), and a tube body (heat exchange pipe) through which the heat absorbing medium flows. Since each heat radiating part forms a single sealed circuit, if the heat collector is installed off-centered to one side so as to have a drainage slope, the liquefied heat medium in the heat radiating part will absorb heat. There was a problem in that the heat absorption part was not properly refluxed to the heat absorbing part and dry heating was performed in the endothermic part.

In addition, since the heat pipe forms a single sealed circuit, if a leak failure occurs in either the heat absorbing section or the heat dissipating section, the entire heat pipe will lose its function and no heat can be collected. there were.

The present invention was developed in view of the above-mentioned conventional technology, and even when the heat pipe is installed on one side, it allows the heat pipe working fluid to flow smoothly from the heat radiating part to the heat absorbing part, thereby preventing dry firing in the heat absorbing part. At the same time, it is an object of the present invention to prevent the heat collection performance from being extremely degraded even if a leakage failure occurs in a part of the heat pipe circuit.

In order to achieve this purpose, the solar collector of the present invention is equipped with a plurality of heat dissipation tubes spaced apart from each other on the outside of the liquid tube, and U-shaped U-shaped heat absorption sections are provided on both sides of each heat dissipation tube. It has a structure in which both ends of a pipe are connected in communication, the pressure inside the pipe and the heat radiation cylinder is reduced, and a working fluid is sealed.

According to this structure, even if the heat collector is installed off to one side, the working fluid liquefied in the heat radiation cylinder will always flow back to the heat absorption part through one of the passages of the U-shaped pipe. , dry heating in the heat absorption section is prevented.

In addition, multiple heat pipes are attached to the liquid pipes, and a U-shaped pipe is connected to each heat pipe, and the heat pipe circuit is divided into multiple parts. However, other heat pipe circuits operate to prevent the heat collection performance from being extremely degraded.

Referring to the drawings below, reference numeral 1 denotes a pair of liquid tubes arranged in the front-rear direction and having connecting joints 2 attached to both ends of each tube through which a heat medium such as water flows, and using loaf-in tubes.

Reference numeral 3 denotes a plurality of heat radiation tubes installed at intervals on the outside of each liquid tube 1, with both ends squeezed and brazed 4 to the loaf-in portion 1' of the liquid tube 1 to make the inside airtight.

Reference numeral 5 denotes a U-shaped pipe connected to both sides of each heat sink 3, and each pipe 5 is attached to a heat collecting plate 6 in a heat-immersed manner.

Reference numeral 7 indicates an upwardly extending exhaust tip pipe attached to the top of each heat sink 3, which is used to reduce the pressure inside the heat sink 3 and the pipe 5, and to seal in a working fluid such as water or Freon. This is where the non-condensable gas of the working fluid accumulates.

Therefore, the heat radiation tube 3 and the pipe 5 have the function of a heat pipe, the heat collecting plate 6 portion serves as the heat absorption part of the heat pipe, and the heat radiation tube 3 serves as the heat radiation part of the heat pipe.

8 is an exterior body that houses the heat sink 3, the pipe 5, the heat collector plate 6, etc., and the upper part of the heat sink 6 is covered with a transparent plate 9 made of glass or the like, and the heat sink 3 part is covered with a heat insulating material. Filled.

When the heat collecting plate 6, which is a heat absorbing part, is heated by sunlight, the working fluid in the pipe 5 evaporates and moves into the heat radiating tube 3, where it radiates heat to the heat medium flowing through the liquid pipe 1. As it heats up, the working fluid is liquefied, moved by gravity to the heat absorbing section, where it is heated and evaporated again by sunlight, repeating the cycle to heat the heat medium.

Since the heat collector of the present invention is as described above, even if the heat collector is installed biased to one side, the liquefied working fluid inside the heat sink 3 will not leak out and will flow through either passage of the U-shaped pipe. Since the heat can be refluxed to the heat absorbing part, dry heating in the heat absorbing part can be prevented.

That is, since the U-shaped pipes 5 are connected to both sides of the heat sink 3, even if the working fluid is biased toward one side of the heat sink, it can be returned through one pipe.

Furthermore, by attaching a plurality of heat radiation tubes 3 to the liquid pipe 1 and connecting pipes to each heat radiation tube to divide the heat pipe circuit, even if a certain heat pipe circuit were to malfunction due to a leak or the like and lose its heat pipe function. Since other heat pipe circuits are also operating, the heat collection performance does not drop significantly.

Further, by using a loaf-in tube for the liquid tube 1 as in the above embodiment, the heat dissipation area is increased, the heat collection efficiency is improved, and manufacturing is inexpensive.

Furthermore, since the exhaust tip pipe 7 is provided above the heat radiation cylinder 3, the non-condensable gas mixed in the working fluid can be collected in this chip pipe, so that the efficiency of the heat pipe is not reduced.

On the other hand, in order to increase the heat collecting capacity, the connecting pieces 10 provided on the exterior bodies 8 of the heat collectors H are fixed to each other, and the liquid pipes are connected with the joints 2, and the final heat collector A U-bend 12 connects the pair of liquid pipes via an air vent valve 11 to allow the flow of the heat medium.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a plurality of adjacent heat collectors of the present invention, FIG. 2 is an enlarged view of the same main part, and FIG. 3 and FIG. 4 are enlarged sectional views of the same main part. 1...liquid pipe, 3...heat sink, 5...
···pipe.

Claims (3)

[Scope of utility model registration request] (1) A plurality of heat radiating cylinders are installed at intervals on the outside of the liquid pipe, and both ends of a U-shaped pipe serving as a heat absorption part are connected to both sides of each heat radiating cylinder, and the pipes and A solar collector made by reducing the pressure inside the heat radiation cylinder and filling it with working fluid. (2) The solar collector described in the preceding paragraph using a loaf-in tube as the liquid pipe. (3) The solar collector according to item 1, wherein an exhaust tip pipe is attached to the upper part of the heat radiation tube to reduce the pressure inside the heat radiation tube and the pipe and to seal in a working fluid.