JPS62276367A - Vacuum type solar heat collector - Google Patents

Abstract

PURPOSE:To make it possible to warm a large quantity of water and to improve the heat collection efficiency by providing a cylindrical metal water storage vessel, a first long tube inserted up to the vicinity of a sealed end of the water storage vessel, and a second short tube connected to an opening end thereof, in the interior of a glass tube one end of which is hermetically sealed. CONSTITUTION:A cylindrical water storage vessel 8 provided at its opening part of a small diameter with a second short tube 5 and made of a metal coated with a selective absorbing film 7, is inserted into a glass vessel 3. A first long tube 13 extends to the vicinity of a hermetically sealed end 8' of the water storage vessel 8 via the inside of a second tube 5 and is inserted thereinto, and a space between the glass vessel 3 and the water storage vessel 8 is evacuated to a specific vacuum degree. The cylinder axis is slopped with respect to the horizontal surface and the glass vessel is installed on the roof of a building. Water fed through a header tube 14 flows into the water storage vessel 8 and is left until it is warmed, and then is derived as warm water from the first tube 13. it is possible to use a natural circulation system or a forced circulation system.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention The present invention relates to a vacuum type solar heat collecting device in which a cylindrical water storage container is arranged inside a glass container.

Vacuum solar heat collectors, which have been commonly used in the past, have a structure in which a thin heat collecting tube with a heat collecting plate is placed inside a transparent outer tube that is kept in a vacuum. A concave recess is provided in the center of the plate, and a heat collection tube, which serves as a passage for a medium such as water, is fitted and attached to this recess.

Solar heat collectors with the above-mentioned conventional structure, which is 8H (7゛L), are susceptible to heat conduction loss from the heat collection plate to the heat collection tubes, especially when relative movement or separation between the two occurs. Thermal conduction loss increases; when sunlight enters the heat collector plate obliquely, the amount of light is lost and the incident energy decreases; and the heat collector tube is thin, so it can be heated all at once. Since the amount of medium is limited, it is necessary to use a separate hot water storage tank, making the hot water supply equipment expensive and requiring a lot of effort to install.

That is, the conventional hot water supply equipment described above requires a circulation pump or the like to circulate water between the hot water storage tank and the heat collection pipe to raise the temperature of the hot water in the hot water storage tank. It is necessary to adopt a dedicated insulation structure to reduce heat dissipation.

In addition, conventional hot water supply equipment had the problem that when new water was added to the heat collection pipes, it immediately mixed with the hot water in the heat collection pipes and lowered the water temperature. The present invention was made in view of the above-mentioned problems, and consists of a transparent elongated cylindrical glass container whose one end is sealed and whose other end is narrowed and opened to a small diameter; a cylindrical metal water storage container having a narrow opening with a small diameter, disposed coaxially inside the glass container via a support, and having a selective absorption membrane coated on the outer surface; A long first pipe penetrates the open end of the water storage container and is inserted into the water storage container near the sealed end, and a short second pipe passes through the open end of the glass container and is connected to the open end of the water storage container. tube and
a sealing fitting for sealing a small-diameter opening of the glass container, and a vacuum is created between the glass container and the water storage container, and a sealing fitting is provided for sealing the small-diameter opening of the glass container. Water is supplied into the water storage container through a pipe, the water is stored and heat is collected in the water storage container, and then the water is taken out as hot water.

In the present invention, the open end of the glass container and the water storage container is arranged lower than the sealed end, and water is supplied into the water storage container from the second pipe, and hot water is taken out from the water storage container through the first pipe.
In one case, the open end is placed higher than the sealed end, water is supplied into the water storage container from the first pipe, and hot water is taken out from the water storage container through the second pipe. This includes cases where the process is performed from the beginning.

The present invention also provides that the second tube has a larger diameter than the first tube.
This also includes a case where the first tube and the second tube are arranged coaxially with a gap provided around the outer periphery of the tube, and a case where the first tube and the second tube are arranged in parallel.

Further, the water storage container of the present invention has a small-diameter outer circumferential portion at both ends and at a suitable location in the middle, and is coaxially arranged inside the glass container via a support attached to these small-diameter outer circumferential portions.

Further, the water storage container of the present invention includes a metal cylindrical body having openings at both ends and having a uniform diameter except for the intermediate support mounting portion, and a metal cap body joined to both ends of the cylindrical body. It includes the configuration that it has.

Furthermore, in the present invention, a plurality of glass containers each having a water storage container therein are used, and are connected in parallel to the first header pipe and the second header pipe via the first pipe and the second pipe, respectively. This includes the configuration that will be used.

Furthermore, the present invention has a configuration in which the header pipe on the water supply side is directly connected to a water supply pressure source such as a water supply via a pressure reducing check valve, and the header pipe on the side for taking out hot water is connected to a hot water supply pipe having a hot water tap. It also includes.

Sakuri In the vacuum type solar heat collector of the present invention, the cylindrical metal water storage container disposed inside the glass container has an outer diameter close to the inner diameter of the glass container, and has an outer diameter of at least 60% of the inner volume of the glass container. It is large enough to occupy more than 10% of the volume, and a large amount of water can be stored in it. The solar heat that has passed through the transparent glass container is collected into the metal water storage container via the selective absorption membrane. The heat collected in the gold mud water storage container is prevented from escaping by heat conduction to the outside due to the vacuum insulation effect, thereby warming the water in the water storage container. The water in the water storage container is warmed by solar heat and the part whose specific gravity is lower moves to the upper part of the water storage container, so that natural circulation occurs in the water storage container and the temperature of the entire water storage container is increased.

In each water storage container, the first and second header pipes, and the hot water supply pipe, water pressure from a water supply pressure source such as a water supply is reduced to an appropriate pressure via a pressure reducing check valve and acts on the water supply pipe. When the hot water tap connected to the hot water tap is opened, the hot water in each water storage container is taken out, and the same amount of water is supplied into each water storage container from a water supply pressure source such as a tap.

When the vacuum type solar heat collector of the present invention is installed on the roof of a building or the like with the open end of the glass container and water storage container placed lower than the sealed end, the vacuum type solar heat collector of the present invention is applied to Water is supplied into the water storage container via the second pipe from the second header pipe, which is directly connected via the stop valve. In this case, the air in the water storage container is replaced with the supplied water by passing through the first pipe and the first ladder pipe, and an automatic air vent valve or the like attached to the end of the first ladder pipe. go outside through The water level of the water storage volume in the water storage container is determined by the insertion length of the first tube, such that the first pipe is inserted as close as one sealed end of the water storage container, thereby increasing the water level of the water storage volume. This is taken into consideration.

Hot water in the water storage container is taken out from the first pipe through a first header pipe and a hot water pipe connected thereto. In this case, if hot water is supplied from the bottom of the water storage container through the second header pipe placed on the lower side of the slope without stirring, the hot water will flow to the top due to the difference in specific gravity between cold water and hot water. Since it is pushed up, only hot water can be efficiently taken out, and the same amount of water as the amount of hot water taken out is supplied from the second ladder pipe through the second pipe.

Hot water can also be removed in other ways. That is the method of taking out from the second pipe via the second header pipe. In this case, one end of the second ladder pipe is connected to the water supply source via an automatic or manual opening/closing valve, and the other end is connected to the hot water supply pipe, or the second ladder pipe is connected to the water supply source via a three-way switching cock. The hedder pipe is switchably connected to the water supply pipe and the hot water supply pipe. In this case, the first pipe and the first header pipe function as an inlet and outlet for air in the water storage container, a drain in the event of an overflow, and a relief port for increased internal pressure.

Next, if the open end of the glass container or water storage container is placed higher than the sealed end and is installed on the roof of a building, etc., the first Water is supplied from the header pipe into the water storage container via the first pipe. In this case, the water level in the water storage container will fill the water storage container regardless of the insertion length of the first pipe, and an increase in the amount of water storage can be expected. In this case, the second pipe and the second hefter pipe serve as a hot water outlet, and also function as an air inlet/outlet, a relief outlet for increased pressure, and a discharge outlet for the increased volume due to the increase in temperature of the hot water. ,for that,
Hot water pipes, safety valves, automatic air vent valves, etc. will be connected.

The insertion end of the first pipe is placed close to the sealed end of the water storage container to suppress stirring and mixing of the hot water. If a large chamber or diffuser section is formed for quiet conversion, it will be more efficient (only hot water can be taken out).

Embodiments of the present invention will be described based on the drawings. FIG. 1 is a longitudinal sectional view showing a first embodiment of the vacuum type solar heat collector of the present invention.

Glass cap with pre-shaped opening (1) (
2) A long cylindrical glass tube (3) with a transparent end (2゛)
a) to form a glass container (3). The glass material for the glass cap (2) is a glass tube (3).
Any material may be used as long as it is the same as a) or can be welded to the glass tube (3a) without any problem. The glass cap (2) can be made by heating and softening one end of the glass tube (3a) and shaping it into a vacuum-resistant shape as shown in Fig. 1, or by blow-rolling it into the shape from the beginning. In this way, a glass container (3) in which the opening (1) is formed to have a smaller diameter than the main body of the glass tube (3a) is obtained.

On the other hand, if the glass sealing fitting can be well sealed with the glass container (3), for example, if the glass container (3) is made of soda lime glass, 42% N! -6% Crl, in the case of borosilicate glass, a cylindrical glass sealing fitting (4) made of Kovar alloy, etc.
At one end, attach an intermediate sealing fitting (6) made of the same metal as the second metal pipe (5), or a metal with approximately the same coefficient of thermal expansion and excellent corrosion resistance to the glass sealing fitting (4). The other end (4゛) of the sealing fitting (4) is attached to the glass container (3) by gluing (welding or brazing) over the outer circumference of the glass container (3).
The opening (1) is sealed. Naturally, distortions in the sealed and welded parts are sufficiently removed.

Next, a short second pipe (5) is attached to the small-diameter opening of a cylindrical water storage container (8) made of metal such as copper, stainless steel, or iron whose outer surface is coated with a selective absorption membrane (7). into the glass container (3) from one end (3') of the glass container (3), and connect the end (5') of the second tube (5) with the intermediate sealing fitting (
The second pipe (5) and the intermediate sealing fitting (6) are welded or brazed to each other by protruding to the outside of the support fitting (9).
) fixes and supports the water storage container (8) coaxially within the glass container (3). The water storage container (8) is a glass container (
3) a gold HM cylinder (8a) having an outer diameter close to the inner diameter of the glass container (3), having a volume so large that it occupies at least 60% of the internal volume of the glass container (3), and having openings at both ends;
It is composed of metal cap bodies (8b) (8c) joined to both ends of the cylindrical body 8a), and the outer surface of the cylindrical body (8a) or the outer surface including the cap bodies (8b) (8c). is coated with a selective absorption membrane (7). The cap body (8b) on the sealed end side is in the shape of a blind lid, and is fitted onto one end of the cylindrical body (8a) and welded or brazed all the way around.

The cap body (8c) on the open end side has a cap shape with a small diameter opening (8c') formed in the center, and is fitted into the other end of the cylindrical body (8a) and joined in the same manner as above. 0 cylindrical body (8a) and cab body (8b) (8c)
These may be made of the same material, or may be dissimilar metals with the same or similar thermal expansion coefficients, as long as they do not interfere with joining.

The cap body (8c) on the open end side has a short metal second
pipe (5) is joined. That is, the second pipe (5) has one end inserted and fitted into the annular flange formed in the small-diameter opening (8c') of the cap body (8c), and is welded or brazed on the entire circumference. ing.

The cap bodies (8b) (8c) at both ends of the water storage container (8) and the central part of the cylindrical body (8a) are provided with a small diameter outer peripheral part (8d).
(8e) (8f) are formed, and a support (9) is attached to this portion.

The supports (9) coaxially support the water storage container (8) within the glass container (3) while allowing thermal expansion and contraction, and are elastic like the supports (9) at both ends shown in Figure 2. 2 (11
You can use it symmetrically to make contact at four points to avoid damaging the inner surface of the glass container (3), or you can split the elastic metal wire into a ring as shown in the middle support (9) shown in Figure 3. The outer circumferential contour shape is curved in a wave shape in the radial direction and outward, and the part protruding outward in the radial direction is a glass container (3).
The radially inwardly recessed portion is in point contact with the outer surface of the water reservoir 3 (8) and supported.

In addition, small diameter outer peripheral portions (
8d) (Be) Providing (8f) ensures stable support of the water storage container (8) inside the glass container (3) by the support (9), and also ensures that the support (9) is not attached to the support (9). This is useful for increasing the water storage capacity of the water storage container (8) in the section.

Furthermore, water storage capacity! By configuring (8) separately into the cylindrical body (8a) and the cap bodies (8b) and (8c) at both ends, manufacturing becomes easy and costs can be reduced.

Furthermore, the end (10") of the glass cap (10) and the end of the glass container (3) are separately molded from glass having the same composition as the glass container (3) or a glass material that can be welded to the glass container (3) without any problems. (3) is integrally formed with the glass cap (10), and after welding the glass cap (10) to the glass container (3), the exhaust pipe (11) is welded to the glass cap (10). 11) Exhaust the air from the glass container (
3) and the water storage container (8) to a predetermined degree of vacuum [
For example, the exhaust pipe (11) is closed by forming a vacuum heat insulating layer (10' Torr). Note that (11a'') is a rubber cap that protects the exhaust pipe (11).

Next, the branch pipe end (12') of the first header pipe (12)
) is the long first tube (13) attached to the second tube (5)
The end (5°) of the second pipe (5) is inserted into the water storage container (8) so that the end (5°) of the second header pipe (14) is inserted through the inside of the water storage container (8). Branch pipe end (14”)
Connect to.

The connection between the first pipe (13) and the first ladder pipe (12) and the connection between the second pipe (5) and the second header pipe (14) can be made by brazing, insertion, or using a connecting tool. This is done interchangeably using the .

The glass container (3) and water storage container (8) having the above structure are usually installed on the roof of a building or the like with the cylindrical axis inclined at a predetermined angle with respect to the horizontal plane. As shown in the figure, the open ends of the glass container (3) and the water storage container (8) are arranged lower than the sealed end, and the water storage container (8)
Water is supplied into the interior via the second header pipe (14) and the second pipe (5). That is, the second header pipe (
14) The water supplied from the second pipe (5) and the first pipe (13) flows into the water storage container (8),
After the water is left to warm up for a certain period of time, the first pipe (13
) through the first header pipe (12) as hot water. Then, the same amount of water as the hot water taken out is supplied into the water storage container (8) from the second header pipe (14) via the second pipe (5). In addition to this, the hot water can also be taken out from the gap between the second pipe (5) and the first pipe (13) via the second ladder pipe (14). The first pipe (13) functions not only as an outlet for hot water but also as an inlet and outlet for air and an outlet for overflow.

Further, in the above explanation, an example was explained in which water is pumped and stored for a certain period of time until it warms up in the water storage container (8), but the present invention is not limited to this, and it may be carried out by a natural circulation method or a forced circulation method. It is possible.

FIG. 4 shows a modification of the first embodiment of the present invention, in which the first embodiment has a second pipe (5) with a larger diameter than the first pipe (13). 13) are arranged coaxially with an annular gap provided on the outer periphery, whereas in this modification,
The only difference is that the first tube (13) and the second tube (5) are arranged in parallel. The other configurations and operations are the same as those in the first embodiment, so their explanation will be omitted.

FIG. 5 is a longitudinal sectional view of a vacuum type solar heat collector showing a second embodiment of the present invention.

The second embodiment is a case where the first embodiment is installed upside down, and the same members as those in the first embodiment are denoted by the same reference numerals.

In the second embodiment, the open ends of the glass container (3) and the water storage container (8) are arranged higher than the sealed ends, and water is supplied into the water storage container (8) through the first pipe (13). ), and hot water is taken out from the water storage container (8) through the second pipe (5). That is, the first
Water supplied from the header pipe (12) of the first pipe (
13) into the vicinity of the bottom of the water storage container (8), and after being pumped into the water storage container (8) for a certain period of time until it warms up,
It is taken out from the second pipe (5) via the second header pipe (14). Then, the same amount of water as the amount of hot water taken out is supplied from the first header pipe (12) to the water storage container (8) via the first pipe (13). The second pipe (5) and the second tube (14) serve not only as an outlet for hot water but also as an inlet and outlet for air and a drain in case of overflow.

Although the above explanation is for a pumping system, it is clear that it can be used for a natural circulation system and a forced circulation system.

Next, Figure 6 shows the vacuum type solar heating system of the present invention described above! FIG. 2 is a schematic perspective view showing an embodiment of a hot water supply system in which a set of five I heat devices constitutes an I unit, two of which are connected and installed on the roof (15) of a building.

In FIG. 6, (16) indicates a vacuum type solar heat collector.

Each vacuum solar heat collector (16) has a water storage container (
8) and a first tube (13) and a second tube (5), each first tube (13) having a first tube (13) and a second tube (5).
are connected in parallel to the header pipes (12) of each second pipe (
5) are connected in parallel to the second header pipe (14).

The vacuum type solar heat collector (16) is made up of 5 pieces as a unit, including both hemlock tubes (12) (14), and sealing fittings (4) (6) on the open end side of each glass container (3). ), the outer ends of the first tube (13) and the second tube (5) are housed in a supporting frame with the outer ends covered and protected with a suitable insulating material.

The first header pipe (12) is connected to a water supply pressure source such as a water supply via a water supply pipe (19) having a pressure reducing check valve (17) and a water supply valve (18). By keeping it open, water pressure from a water supply pressure source such as water supply is reduced to an appropriate pressure through the pressure reducing check valve (17) and is applied to the entire hot water supply equipment. For example, water pressure in Japan is maintained at a predetermined value (e.g. 3 kg/cnl), and this is adjusted to an appropriate pressure (e.g. 0.6 kg/cnl) using a pressure reducing check valve (17) before use. be done.

The pressure reducing check valve (17) also prevents hot water from flowing back from the hot water supply equipment side of the present invention to a water supply pressure source such as a water supply.

The second header pipe (14) is connected to a hot water pipe (21) having a hot water tap (20), and hot water can be taken out at any time by opening the hot water tap (20).

The hot water tap (20) can be used, for example, in a bathroom (22) or a kitchen (2).
3) and so on.

Figure 6 shows a case in which 2 units of 5 vacuum solar heat collectors (16) are connected in series, but the number of vacuum solar heat collectors (16) is The number of units used can be freely increased or decreased, and is not limited to what is shown in the drawings.

In Figure 6, (24) is an automatic air vent valve, (25) is a safety valve, and these are shown in the case where they are installed in the first header pipe (12), but they are installed in the second header pipe (14). It is also possible to provide the Furthermore, in Figure 6, (26
) is a drain pipe, and (27) is a drain valve, which is provided in a part of the water supply pipe (19).

The hot water supply equipment shown in FIG. 6 has the above-mentioned configuration, and how to use it will be explained next.

First, the drain valve (27) is initially closed and the water supply valve (18) is opened. As a result, water passes through the pressure reducing check valve (17) due to the water pressure from the water supply pressure source such as water supply, and flows from the water supply pipe (19) to the first ladder pipe (12) of the unit on the right side of Figure 6. , this header pipe (12
) to each first pipe (13) and each water storage container (8
). The air in each water storage container (8) is passed from the first pipe (13) or the second pipe (5) through the first header pipe (12) or the second header pipe (14) to an automatic air vent valve. (24). At this time,
If the hot water tap (20) is left open, the air will be expelled more quickly. As a result, each water storage container (8) of the unit on the right side of FIG. 6 is filled with water, and then from the second header pipe (14) of the unit on the right side of FIG. 6 to the unit on the left side of FIG. Water is supplied to the first header pipe (12) of the
Each water storage container (8) of the unit on the left side of the figure is similarly filled with water, and the hot water supply pipe (21) is also filled with water.

In this case, the pressure in the hot water supply equipment shown in Figure 6 is determined by the pressure reducing check valve (
The pressure is maintained at the predetermined pressure set in step 17). Leave it in this state for a while and wait for the water in the water storage container (8) to be warmed by solar heat. The water in each water storage container (8) is heated by solar heat passing through the glass container (3) and heating the water storage container (8) via the selective absorption membrane (7), and is naturally circulated inside. . In this way, when the water is sufficiently hot, the hot water tap (20) is opened and the hot water in each water storage container (8) is taken out. Then, the same amount of water as the amount of hot water taken out is supplied into each water storage container (8) from a water supply pressure source such as a water supply. Although FIG. 6 illustrates a series connection system in which hot water heated by the right unit is sent to the left unit and heated again, it is also possible to connect both units in parallel.

Furthermore, in the vacuum type solar heat collector of the present invention, in addition to connecting the first header pipe and the second ladder pipe in parallel via the first pipe and the second pipe, the header pipe can be connected in parallel to the first header pipe and the second ladder pipe. The second part of the vacuum type solar heat collector in the previous stage adjacent to each other without being used
It is also possible to directly connect the tubes in series to the first tube of the vacuum □ type solar heat collector at the subsequent stage.

In addition, the hot water supply equipment shown in Figure 6 includes each vacuum type solar heat collector (
16) may be used upside down and used in the manner shown in FIG.

According to the vacuum type solar heat collection device of the present invention, a large amount of water can be heated at once, and when used as a pumping method, the water storage container can be used as a hot water storage tank, so the hot water storage tank can be used. There is no need for a separate device, and the initial cost of this type of device can be reduced.

Moreover, by making the water storage container a metal part, damage due to thermal shock can be eliminated, and the required pressure resistance can be maintained while being lightweight.

In addition, by narrowing the opening end side of the glass container and gold mud water storage container to a small diameter, the sealing surface roughness caused by the sealing fittings at the opening end of the glass container is reduced, and the probability of internal vacuum leaking is greatly reduced. can be reduced to In addition, it is possible to reduce the diameter of the expensive glass sealing metal odor, and by reducing the diameter of the metal part, which has higher thermal conductivity than glass, it is possible to reduce heat loss from the sealing fittings, and the transparent glass part is larger. As a result, the lighting area becomes wider and the heat collection efficiency improves.

In addition, since the open end of the glass container and water storage container can be used upside down, parts can be shared between systems where the open end of the glass container and water storage container is placed lower than the sealed end and systems where the open end is placed higher than the sealed end. Therefore, it is advantageous in terms of production and inventory management.

In addition, the water supply pipe is directly connected to a water supply pressure source such as a water supply via a pressure reducing check valve, and the hot water extraction pipe is connected to a hot water pipe with a hot water tap, so all you have to do is open the hot water tap. Since hot water can be taken out at the same time and at the same time the same amount of water as the hot water taken out is supplied into the well water container, there is no need for a special water supply control device. Furthermore, not only can backflow of hot water be prevented, but the pressure within the hot water supply equipment can be maintained at a predetermined value, and the pressure resistance of the water storage container, piping connections, etc. will not be adversely affected.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a vacuum solar heat collector showing the first embodiment of the present invention, and FIGS. 2 and 3 are cross-sectional views taken from the ■-shore line and DI-11I line in FIG. 1. FIG. 4 is a vertical cross-sectional view of a vacuum type solar heat collector showing a modification of the first embodiment,
Fig. 5 is a longitudinal cross-sectional view of a vacuum type solar heat collector according to the second embodiment of the present invention, and Fig. 6 is an example of a hot water supply equipment using the vacuum type solar heat collector as a unit according to the present invention. It is a schematic perspective view showing an example. (3) - Glass container, (4) -Glass sealing fitting,
(5) - Second pipe, (6) - Intermediate sealing fitting,
(7)--Selective absorption membrane, (8)--Water storage container, (9
')--Support, (12)--First Hefter tube, (13)--First tube, (14)--Second Hesogoo tube, (16)--Vacuum type solar heat collector,

Claims (9)

[Claims] (1) A transparent long cylindrical glass container with one end sealed and the other end narrowed to a small diameter;
a cylindrical metal water storage container, the other end of which is narrowed to a small diameter opening, which is coaxially arranged inside the glass container via a support, and whose outer surface is coated with a selective absorption membrane; a long first tube that passes through the open end of the container and the water storage container and is inserted into the water storage container near the sealed end; and a short first tube that passes through the open end of the glass container and is connected to the open end of the water storage container. 2, and a sealing fitting for sealing the small-diameter opening of the glass container, creating a vacuum between the glass container and the water storage container, and
A vacuum type solar heat collector characterized in that water is supplied into a water storage container through either one of the pipe and the second pipe, the water is stored and heat is collected in the water storage container, and the water is taken out as hot water. thermal equipment. (2) The open end of the glass container and the water storage container is arranged lower than the sealed end, and water is supplied into the water storage container from the second pipe, and hot water is taken out from the water storage container through the first pipe or the water storage container. 2. The vacuum solar heat collector according to claim 1, wherein the vacuum solar heat collector is constructed from two tubes. (3) The open end of the glass container and the water storage container is placed higher than the sealed end, and water is supplied into the water storage container from the first pipe, and hot water is taken out from the water storage container from the second pipe. The vacuum type solar heat collecting device according to claim 1, characterized in that: (4) Any one of claims 1 to 3, characterized in that the second pipe has a larger diameter than the first pipe and is arranged coaxially with a gap provided around the outer periphery of the first pipe. The vacuum type solar heat collecting device described in the above. (5) The vacuum type solar heat collecting device according to any one of claims 1 to 3, characterized in that the first tube and the second tube are arranged in parallel. (6) A patent claim characterized in that the water storage container has small-diameter outer circumferential parts at both ends and at appropriate places along the way, and is coaxially arranged inside the glass container via supports attached to these small-diameter outer circumferential parts. The vacuum solar heat collector according to any one of items 1 to 5. (7) The water storage container includes a metal cylindrical body having openings at both ends and a uniform diameter except for an intermediate support attachment part, and a metal cap body joined to both ends of the cylindrical body. A vacuum type solar heat collector according to any one of claims 1 to 6, characterized in that: (8) A plurality of glass containers having water storage containers inside are used, and are connected in parallel to the first header pipe and the second header pipe via the first pipe and the second pipe, respectively. A vacuum type solar heat collector according to any one of claims 1 to 7. (9) The header pipe on the water supply side is directly connected to a water supply pressure source such as a water supply via a pressure reducing check valve, and the header pipe on the hot water extraction side is connected to a hot water supply pipe having a hot water tap. A vacuum solar heat collector according to claim 8.