JPH0413573Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the improvement of solar water heating equipment, and more specifically, to prevent the formation of air pockets in the outgoing piping that sends heat medium from the hot water storage tank to the collector. This relates to a solar water heating system.

[Prior art and its problems] Conventionally, the collector of this type of solar water heating system is generally installed on the sloping roof of a house, etc. in order to receive solar heat and effectively heat the heating medium. It is true. For this reason, when using a liquid as a heat medium, bubbles present in the heat medium or gas dissolved in the heat medium may accumulate or stagnate above the heat collector by going against the flow of the heat medium. This has caused a problem in that the smooth flow of the heat medium is obstructed or the flow is completely blocked. Furthermore, there has been a problem in that the stagnation of air causes corrosion on the walls inside the pipes.

Therefore, as shown in FIG. 2, an air venting means 3, which is an air venting valve, is provided in the circulation pipe 2 connected to the top of the heat collector 1 to bleed out the air accumulated above the heat collector 1.

However, in the case of such a structure, the inner diameter B of the circulation piping 2 is normally set to prevent heat radiation.
is made smaller to increase the flow velocity of the heating medium.
The inner diameter A is made larger than the inner diameter B to reduce the flow velocity of the heating medium. For this reason, problems such as air being trapped in the connecting pipe 4 and corrosion occurring on the wall inside the pipe cannot be eliminated.

In addition, recently, a solar water heating system that uses solar cells as the power source for the circulation pump has been proposed, and its practical application is being considered, but the capacity of solar cell-powered pumps is lower than that of conventional commercially powered pumps. Therefore, the resistance caused by the air pocket becomes a major obstacle to forcibly circulating the heating medium using a solar-powered pump. Therefore, unless the above problems are solved, a practical solar water heating system cannot be provided.

[Purpose of the invention] Therefore, the present invention solves the above-mentioned problems and improves the structure of the outgoing pipe that connects to the heat collector side to prevent air pockets from forming in the connection pipe of the heat collector. The present invention also aims to provide a solar water heating device that realizes smooth circulation of a heating medium.

[Structure of the invention] In order to achieve the above object, the present invention consists of a first pipe communicating with the hot water storage tank side and a second pipe communicating with the heat collector side, and the second pipe line communicates with the heat collector side. A part of the heat collector is placed at a higher position than the heat collector, and an air venting means is provided in the second pipe line at this position, and the inner diameter of the second pipe line is larger than the inner diameter of the first pipe line, and The inner diameters of both tubes at the connection portion between the conduit and the connection tube of the heat collector were made to be approximately the same.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

The solar water heating system of the present invention is equipped with an outgoing pipe that sends the heat medium from the hot water storage tank to the heat collector, and a return pipe that returns the heat medium from the heat collector to the hot water storage tank. It is a solar water heating system placed in a high position.

FIG. 1 is a partial cross-sectional view showing the connecting portion between the heat collector 1 and the outgoing pipe 5. FIG. Note that the arrow in the figure indicates the direction in which the heat medium flows. The outgoing pipe 5 has a first pipe line 5a with an inner diameter C through which a fast-flowing heat medium passes, and an inner diameter B' that is larger than the inner diameter C and is made to approximately match the inner diameter A of the connecting pipe 4 of the heat collector 1. The second conduit 5b has a larger inner diameter.

That is, the relationship between the sizes of each inner diameter is as follows.

C<B', B'≒A Here, in this example, the inner diameters A and B' are respectively
24.5mm, and the inner diameter C was 15mm.

Note that a pump (not shown) for forcibly sending the heat medium from the hot water storage tank to the heat collector 1 is attached to the first pipe line 5a.

Air venting means 3' is provided at the upper part of the second conduit 5b at a position higher than the heat collector 1, that is, near the transition between the first conduit 5a and the second conduit 5b.
Here, the air vent means 3' is a valve body such as a spherical floating body provided in an air vent pipe communicating with the outgoing pipe 5.
Normally, this is an air vent valve that allows accumulated air to escape into the atmosphere, and can be closed with a valve body to prevent the heat medium from leaking outside even if it is filled with heat medium. Note that this air venting means may be just an air venting pipe without a valve body.

Next, the operation of the present invention will be explained. In this embodiment, when the heat medium flowing into the outgoing pipe 5 flows from the first pipe line 5a having an inner diameter C to the second pipe line 5b having an inner diameter B', the heat medium flows from the inner diameter C to the inner diameter
B', the flow rate decreases, and the air in the heat medium accumulates in the second pipe line 5b, creating a so-called air pocket. At this time, this air pocket is
Air is vented as appropriate by air venting means 3' provided at the upper part of the conduit 5b. Furthermore, since the inner diameter of the second pipe line 5b and the inner diameter of the connecting pipe 4 of the heat collector 1 are almost the same, the flow rate of the heat medium does not suddenly change in this connection part, and the flow rate of the heat medium does not change suddenly. In this way, air will not accumulate in the connecting pipe 4 and corrosion will not occur on the wall inside this pipe.

[Effects of the invention] As explained above, the present invention provides that the outgoing pipe that sends the heat medium from the hot water storage tank to the heat collector is connected to the first pipe that communicates with the hot water storage tank side.
Consists of a pipe line and a second pipe line communicating with the heat collector side,
A part of the second pipe line is placed at a higher position than the heat collector, and an air venting means is provided in the second pipe line at this position, the inner diameter of the second pipe line is larger than the inner diameter of the first pipe line, and It is characterized in that the inner diameters of the two pipes and the connecting pipe of the heat collector are made almost the same at the connecting part of the two pipes.

As a result, with an extremely simple configuration, the generation of air pockets in the connection pipe of the heat collector is prevented as much as possible, and problems such as suppression of the circulation of the heating medium and corrosion of the pipe line do not occur.

In addition, since sufficient air is removed, the resistance to the flow of the heating medium that occurs in the past is eliminated, and the heating medium is circulated smoothly. If used, the heat medium can be efficiently circulated by the above-mentioned simple means even if the pump capacity is limited, and a practical and simple solar water heating device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view showing a connection between a heat collector and circulation piping according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view showing a conventional piping connection. 1... Heat collector, 2... Outgoing piping, 3, 3'...
Air venting means, 5a...first pipe line, 5b...second
conduit.

Claims (1)

[Scope of Claim for Utility Model Registration] A heat collector that heats a heat medium by receiving solar heat and a hot water storage tank that stores the heat medium are provided, and are provided at the heat medium outlet of the hot water storage tank and the heat medium inlet of the heat collector. In a solar water heating system in which a connecting pipe is connected to a connecting pipe by an outgoing pipe, the outgoing pipe is composed of a first pipe line communicating with the hot water storage tank side and a second pipe line communicating with the heat collector side;
A part of the pipe line is placed at a higher position than the heat collector, and an air venting means is provided in the second pipe line at this position,
The inner diameter of the second pipe line is larger than the inner diameter of the first pipe line, and the inner diameters of both pipes at the connection part between the second pipe line and the connecting pipe of the heat collector are made to be approximately the same. Features of solar water heating equipment.