JPS6125570Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the structure of a solar heat collector in which a heat collecting tube heated by solar heat is disposed inside a vacuum glass tube.

The structures shown in Figures 1 and 2 are examples of solar heat collectors in which a heat collecting tube such as a heat pipe is placed inside a vacuum glass tube in order to heat water using the condensation heat of the working fluid vapor. The applications have been filed by the same applicant. In FIGS. 1 and 2, 1 is a translucent vacuum glass tube with one end closed, and the other end of which is a heat pipe 3 housed inside together with a heat collecting plate 2. One side of the heat pipe 3 protrudes through the shaft. . The other side of the closed heat pipe 3 is connected to the vacuum glass tube 1 by the support 4.
is supported by The closed side of the vacuum glass tube 1 is held by an end presser 6 and an end support 7 via an end bush 5, and the end support 7 is attached and fixed to a frame 8. Further, the heat pipe protruding side of the vacuum glass tube 1 is attached to a case 10 via a case-side bushing 9, and this case 10 is attached to a mount 8.
Fixed. The above-mentioned protruding heat pipe 3 is housed in the case 10, and this heat pipe 3
A plurality of (four in the drawing) are connected to the heat dissipation cylinder 11 in communication. Here, the height position of the heat radiation cylinder 11 is configured to be higher than the position of the heat pipe 3. A heat medium pipe 12 is housed inside the heat dissipation tube 11, and both ends of the heat transfer tube 12 protrude through shaft seals through end plates 13 that close both ends of the heat dissipation tube 11. Heat sink 1
A heat dissipation fin 14 is installed in the heat medium pipe 12 portion inside the heat transfer pipe 1.
An exhaust chip 15 provided on the heat radiation tube 11 evacuates the inside of the heat pipe 3 and the heat radiation tube 11 by evacuation, and then a working fluid 16 is sealed inside the heat pipe. Reference numeral 17 indicates a heat insulating material for thermally insulating the heat dissipation cylinder 11, and reference numeral 18 indicates a heat insulating material for thermally insulating the heat pipe 3 that protrudes from the vacuum glass tube 1. In this solar heat collector, heat is received by a heat collecting plate 2 that is irradiated with sunlight through a vacuum glass tube 1, and this heat is transferred to a heat pipe 3, which heats the working fluid 16 inside. Some of it evaporates. This evaporated gas moves to the heat sink 11, where it releases latent heat of vaporization and heats the heat medium in the heat medium pipe 12. The condensed and liquefied working fluid falls due to gravity, flows back into the heat pipe 3 from the heat sink 11, and is heated again by sunlight. In this way, the evaporation-condensation cycle of the working fluid is repeated to heat the heat medium.

There is no problem with the solar heat collector with this structure during normal operation, but when the heat medium does not flow through the heat medium pipe 12 for some reason and the heat pipe inside the heat pipe is receiving solar heat, the so-called "empty air" occurs. In the firing state, since the heat medium is not flowing through the heat medium pipe 12 in the heat radiation tube 11, the working fluid vapor is not condensed and the accompanying heat radiation is not performed, so the heat pipe 3
The internal working fluid continues to evaporate, which causes the internal pressure of the heat sink to rise excessively, and there is a risk of damaging the heat sink and the heat pipe. Since the inside of the heat sink and the heat pipe are under high pressure, if the breakage occurs, explosive destruction will occur, resulting in a very serious accident.

The purpose of this invention is to eliminate the above-mentioned dangers, and to provide a solar collector with a structure that will not cause an excessive increase in the internal pressure in the heat dissipation cylinder due to the abnormal temperature rise in the heat pipe, even when the heat pipe is not heated. It is about providing.

According to the present invention, the above objects are achieved as follows. That is, it has a heat pipe disposed inside a light-transmitting vacuum glass tube with one end protruding outside the vacuum glass tube, and a heat dissipation tube connected to the heat pipe and surrounding the outer periphery of the heat medium tube. In a solar heat collector in which a working fluid is sealed in a pipe: the heat radiating cylinder is equipped with a radiator connected via a connecting pipe, and the internal space of the radiator is filled with a non-condensable gas. achieved.

Examples of this invention will be described below based on the drawings. Fig. 3 is a side sectional view of a solar heat collector which is an embodiment of this invention, Fig. 4 is a YY vertical sectional view of a part of Fig. 3, and Figs. Components that are the same as those shown in are given the same reference numerals. The difference between FIGS. 3 and 4 from FIGS. 1 and 2 is that a radiator is added to the radiator tube. That is, in FIGS. 3 and 4, 20 indicates a heat radiator, and this heat radiator has heat radiating fins 2 on its outer periphery.
1, a non-condensable gas (for example, nitrogen gas) is sealed inside at room temperature and atmospheric pressure, and is installed at a position above the heat sink 11 (outside the case 10). The heat sink 20 is connected to the heat sink 11 via the connecting pipe 22.
It is connected to. 23 is a gasket provided at a place where the connecting pipe 22 passes through the case 10.

Even in the structure in which the radiator 20 is connected to the radiator tube 11 in this way, during normal operation (when the heat medium is flowing through the heat medium tube 12), the working fluid 16 is heated and evaporated gas is transferred to the radiator tube. 11 releases latent heat of vaporization,
The heat medium in the heat medium pipe 12 is heated. In this case, since the inside of the radiator is filled with non-condensable gas, no condensation action takes place, so there is no heat loss from the radiator 20 to the outside, and the working fluid evaporates in the radiator cylinder 11 in the normal mode. - Condensation takes place. During the dry firing state, the working fluid 16 inside the heat pipe 3 continues to evaporate, which causes the internal pressure of the heat sink 11 to rise excessively, but this internal pressure is transferred to the inside of the heat sink 20 that communicates with the heat sink 11. enters and compresses the non-condensable gas,
Since the radiator 20 functions to radiate heat to the outside, an abnormal temperature rise in the heat pipe 3 and an abnormal pressure rise in the heat radiator cylinder 11 are absorbed.

According to the present invention described above, the radiator is actively filled with non-condensable gas, and the so-called variable conductance is used so that the radiator function is activated and the heat radiating capacity is variable in the event of an abnormality such as when the heating is dry. The condenser configuration applies the principle of a shaped heat pipe, so
It has the advantage of being able to absorb the abnormal pressure rise in the heat dissipation tube due to the abnormal temperature rise of the heat pipe during dry firing, and preventing damage to the heat pipe even during dry firing.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of a conventional solar heat collector, Figure 2 is a sectional view taken along line X-X in Figure 1, and Figure 3 is a sectional view taken along line XX in Figure 1.
The figure is a side sectional view of a solar heat collector which is an embodiment of this invention, and FIG. 4 is a partial YY longitudinal sectional view of FIG. 3. 1...Vacuum glass tube, 3...Heat pipe, 1
1... Heat sink, 16... Working fluid, 20... Heat radiator, 22... Connecting pipe.

Claims (1)

[Scope of utility model registration request] It has a heat pipe disposed inside a transparent vacuum glass tube with one end protruding outside the vacuum glass tube, and a heat dissipation tube connected to the heat pipe and surrounding the outer periphery of the heat medium tube. In a solar heat collector in which a working fluid is sealed; the heat radiating cylinder is equipped with a heat exchanger connected via a connecting pipe, and the internal space of the heat radiator is filled with a non-condensable gas. solar heat collector.