JPH042367Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a vacuum type solar heat collector, more specifically, a vacuum type solar heat collector having a water storage container that can heat a large amount of water at once inside a glass container. This relates to heat collectors.

[Prior art] Vacuum solar collectors, which use the thermal energy of sunlight as a heat source, have been used in various industrial fields, and one type of solar collector has traditionally been a transparent long glass whose interior is kept in a vacuum. A vacuum type solar heat collector has been proposed that includes a container, a cylindrical water storage container coaxially arranged inside the glass container, and a water supply pipe inserted to near the bottom of the water storage container. Vacuum solar heat collectors with this type of structure generally allow water to flow into the water storage container from the water supply pipe, leave it for a certain period of time to make hot water, and then re-fill the water from the water supply pipe into the water storage container. The inflow pushes the hot water toward the opening of the water storage container and causes it to flow out from the opening.

[Problems to be solved by the invention] However, the vacuum type solar collector having the above structure directs hot water in the water storage container toward the opening of the water storage container by flowing water into the water storage container from the water supply pipe. There was a problem in that when the hot water was pushed up to flow out from the opening, the water and hot water mixed in the water storage container, causing the temperature of the hot water to drop. The rate of mixing of this water and hot water increases as the flow rate of water passing through the water supply pipe increases, and the flow rate of water increases as the inner diameter of the water supply pipe decreases. Therefore, one way to suppress the mixing of water and hot water is to increase the inner diameter of the water supply pipe to slow the flow rate, but if the diameter of the water supply pipe is increased, it is naturally necessary to enlarge the opening of the glass container accordingly. As a result, the size of the sealing fitting for sealing the opening of the glass container becomes large, which is undesirable in terms of reliability of hermetic sealing and cost.

The purpose of this invention is to slow down the flow rate of water flowing into the water storage container from the opening of the water supply pipe by devising the shape of the tip of the water supply pipe without increasing the size of the sealing fitting. An object of the present invention is to provide a vacuum type solar heat collector that can suppress mixing with hot water.

[Means for solving the problem] In view of this purpose, this study considers a transparent long glass container whose interior is kept in a vacuum, and a cylindrical container coaxially arranged inside the glass container. In a vacuum solar collector equipped with a water storage container and a water supply pipe inserted to the vicinity of the bottom of the water storage container, a chamber with a partially enlarged pipe diameter near the tip of the water supply pipe and a flare continuing to the chamber. The present invention provides a vacuum type solar heat collector characterized by having a shaped opening.

[Function] In the present invention, the flow of water passing through the water supply pipe is disrupted once in a chamber with a partially enlarged pipe diameter provided near the tip of the water supply pipe, and then flows along the flare-shaped opening that continues into that chamber. Since the water flows into the water storage container, the flow rate of water when it exits from the opening is approximately the same as the flow rate when water is discharged from a thick water supply pipe with the same diameter as the flared opening, so it is difficult to compare with hot water. Mixing is suppressed.

In this invention, the chamber provided near the tip of the water supply pipe is important for temporarily disrupting the flow of water passing through the water supply pipe and allowing the water to pass along the flared opening. If a flare-shaped opening is simply provided without providing a water supply pipe, water passing through the water supply pipe will flow into the water storage container without following the flare-shaped opening while maintaining the flow determined by the water supply pipe diameter. As a result, the effect of making the opening into a flare shape is completely lost.

[Example] Fig. 1 is a schematic longitudinal cross-sectional view showing the overall structure of a vacuum type solar heat collector according to the present invention, and Fig. 2 is a longitudinal cross-sectional view showing the vicinity of the tip of a water supply pipe.

As shown in FIG. 1, the vacuum type solar heat collector of the present invention includes a transparent long glass container 1 whose interior is kept in a vacuum, and a cylindrical water storage container 2 placed inside the glass container 1. The glass container 1 is connected to a part of the sealing fitting 4, and the other end of the sealing fitting 4 is connected to a metal pipe 5. It is connected. A selective absorption membrane 6 is formed on the outer surface of the water storage container 2, and is held by a support 7 at a constant distance from the glass container 1.

Further, as shown in FIGS. 1 and 2, near the tip of the water supply pipe 3, a chamber 3a with a partially enlarged pipe diameter and a flared opening 3b continuing from the chamber 3a are provided.

In the vacuum type solar collector having the above structure, water flowing into the water storage container 2 from the water supply pipe 3 is
The hot water is left for a certain period of time to become hot water, and when new water flows into the water storage container 2 from the water supply pipe 3, this hot water is pushed up toward the opening of the water storage container 2 and flows out from the opening. In this case, water supply pipe 3
The flow of water passing through the tube is disrupted once in a chamber 3a with a partially enlarged pipe diameter provided near the tip, and then flows into the water storage container 2 along a flared opening 3b following this chamber 3a. Mixing with hot water is suppressed.

[Effects of the invention] As described above, the vacuum type solar heat collector of the invention has the following advantages:
A chamber with a partially enlarged pipe diameter and a flare-shaped opening are provided near the tip of the water supply pipe, which slows down the flow rate of water when it flows into the water storage container from the opening of the water supply pipe, preventing hot water from flowing into the water storage container. Mixing is suppressed and hot water can be extracted efficiently.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical cross-sectional view showing the overall structure of a vacuum type solar heat collector according to the present invention, and FIG. 2 is a vertical cross-sectional view showing the vicinity of the tip of a water supply pipe. 1... Glass container, 2... Water storage container, 3... Water supply pipe, 3a... Chamber, 3b... Flare-shaped opening.

Claims (1)

[Scope of utility model registration request] It comprises a transparent long glass container whose interior is kept in a vacuum, a cylindrical water storage container coaxially arranged inside this glass container, and a water supply pipe inserted to near the bottom of this water storage container. A vacuum type solar heat collector, characterized in that a chamber with a partially enlarged pipe diameter and a flare-shaped opening continuing to the chamber are provided near the tip of the water supply pipe.