JP2003213734A - Rainwater utilization device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rainwater utilization device collecting rainwater by utilizing a narrow space and generating even required power by solar cells by utilizing the installation space of a water storage tank. <P>SOLUTION: The rainwater utilization device has the water storage tank 14, in which rainwater 11 is stored and in which an overflow pipe 13 is installed to the upper section of a side wall, water-collecting members 15 and 16 being arranged under the state in which the upper section of the tank 14 is covered, covering the upper section of the tank 14 in a plan view and being extended up to the outside of the tank 14, a rainwater guide section 17a introducing rainwater collected by the members 15 and 16 to the tank 14, the solar cells 17 arranged and disposed on the members 15 and 16, a pump 20 pumping out water from the tank 14 and a controller 18 having a battery, in which power generated by the solar cells 17 is stored, and driving the pump 20 by power generated by the solar cells 17. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainwater utilization apparatus in which rainwater is stored in a water tank and is pumped by electric power generated by a solar cell.

[0002]

2. Description of the Related Art Conventionally, as a device for using rainwater for car washing and watering plants, for example, a rainwater utilization system disclosed in Japanese Patent Laid-Open No. 10-317435 has been proposed. This rainwater utilization system collects rainwater that has rained on the top surface of buildings such as roofs, roofs, balconies, etc. in a water tank through a water collection pipe,
If necessary, the rainwater collected by pumping up is used for flush toilets, cleaning and car washing.

[0003]

However, the rainwater utilization system described in the above publication has a problem that it cannot be used for irrigation of fields, for example, because of the existence of buildings. In addition, a large vacant space was needed to increase the capacity of one water tank. Also, in that case, a large space is occupied only by the water tank,
There was a problem that the space was not effectively used. Further, the rainwater utilization system described in the above publication has a problem that a commercial power source is required, and for example, the commercial power source needs to be pulled in a remote place. The present invention has been made in view of the above circumstances, and provides a rainwater utilization device that effectively utilizes a narrow space to collect rainwater and further utilizes a space for installing a water tank to generate necessary power by a solar cell. With the goal.

[0004]

According to a first aspect of the present invention, there is provided a rainwater utilization device for storing rainwater, a water tank having an overflow pipe provided on an upper side wall thereof, and a water tank provided on the water tank. A water collecting member that is arranged in a covered state and covers the upper portion of the water storage tank in a plan view, a rainwater guide portion that guides rainwater collected by the water collecting member to the water storage tank, and is arranged side by side on the water collecting member. A solar cell, a pump for pumping water from the water tank, a storage battery for storing electric power generated by the solar cell, and a control device for driving the pump by the electric power generated by the solar cell. . In the rainwater utilization device according to the first aspect of the invention, since the solar cell is arranged above the water storage tank via the water collecting member, the rainwater that falls on the water storage tank flows over the solar cell, It is introduced into the water tank via the guide. As a result, in one place, a water tank installation space, rainwater collection space,
The installation space for the solar cell can be obtained.

The rainwater utilizing apparatus according to the second invention is
In the rainwater utilization apparatus according to the first aspect of the present invention, the water collecting member includes a plurality of water collecting plates, and each of the water collecting plates has a downward slope toward the inside of the water storage tank, It is extended to the outside, and the end of the descending slope serves as the rainwater guide portion. . As a result, rainwater that has fallen on the solar cells and the water collecting member automatically flows into the water tank. Furthermore,
Since each water collecting plate extends to the outside of the water tank, a wider range of rain water can be collected. A rainwater utilization apparatus according to a third aspect of the present invention is the rainwater utilization apparatus according to the first and second aspects of the present invention, wherein the rainwater guide portion has a rainwater guide pipe, and a lower end portion thereof extends to a lower position of the water tank. A check valve is provided at the lower end of the overflow pipe of the water storage tank.
Further, a ventilation port is provided above the water storage tank so as to be shielded from the outside by a filter material. This prevents mosquitoes from entering the water tank.

A rainwater utilizing apparatus according to a fourth aspect of the present invention is
In the rainwater utilization apparatus according to a third aspect of the present invention, the water storage tank is provided with one or more extension tanks connected to each other by connecting pipes at the same height position, and the connecting pipes are the water storage tanks and A stop valve is provided in a connecting pipe connecting the lower position and the upper position of the additional tank and connecting the lower position. In addition, if the lower connecting pipe is always closed by a stop valve, overflow water of the water storage tank will be temporarily transferred to the extension tank side downstream,
The water level in the water tank can be set to the highest level first. As a result, the water tank can be preferentially configured to be a system suitable for natural watering by utilizing the head of the water tank. on the other hand,
By opening the stop valve of the connecting pipe, the water tank and all additional tanks can be integrated, and the substantial volume of the water tank can be increased. A rainwater utilization device according to a fifth aspect of the present invention is the first to fourth aspects.
In the rainwater utilizing apparatus according to the invention, a heat insulating material is arranged inside or on the lower surface side of the water collecting member. And the rainwater utilization apparatus which concerns on 6th invention is a rainwater utilization apparatus which concerns on 1st-5th invention, Comprising: The said water collecting member protrudes from the side wall of the said water storage tank, and it is the sun between 0-3 o'clock in the daytime of midsummer. Is a sunshade that substantially prevents the light from striking the reservoir. According to the fifth and sixth inventions, it is possible to prevent the temperature of the water accumulated in the water storage tank from rising in the summer, and immediately use the accumulated water as irrigation water for fields or the like. A rainwater utilization apparatus according to a seventh aspect of the present invention is the rainwater utilization apparatus according to the first aspect of the present invention, further comprising: a solar water heater disposed on the water collecting member; Pump for supplying water to the vessel, an auxiliary tank provided at a position lower than the water storage tank to store overflow water from the water storage tank by the overflow pipe, and pumped water for pumping water accumulated in the auxiliary tank to the water storage tank. And a pump. And the rainwater utilization apparatus which concerns on 8th invention is 7th.
In the rainwater utilizing apparatus according to the invention, electric power generated by the solar cell is used as a power source for the water supply pump and the pumping pump.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention. Here, FIG. 1 is an explanatory view of a rainwater utilization apparatus according to a first embodiment of the present invention, FIG. 2 is a partial perspective view of a rainwater utilization apparatus according to a second embodiment of the present invention, and FIG.
Is an explanatory view of a rainwater utilization device according to a third embodiment of the present invention, FIG. 4 is an explanatory view of a rainwater utilization device according to a fourth embodiment of the present invention, and FIG. 5 is a fifth embodiment of the present invention. It is explanatory drawing of the rainwater utilization apparatus which concerns on the form.

As shown in FIG. 1, a rainwater utilizing apparatus 10 according to a first embodiment of the present invention stores rainwater 11 and a water tank 14 in which an overflow pipe 13 is provided above a side wall 12 thereof. have. On the water tank 14, a water collecting plate 1 which is an example of a water collecting member in a state of covering the water tank 14.
5, 16 are arranged. The water collecting plates 15 and 16 are
As shown in FIG. 2, the modification completely covers the water storage tank 14 and further extends to the outer side in a direction crossing the water storage tank 14 (south-north direction). It is preferable that the extension lengths D1 and D2 are as long as possible in terms of water collection efficiency. However, the extension lengths D1 and D2 are normally about 0.2 to 0.5 times the height H of the water storage tank 14, and the awning of the sidewall 12 ). In addition, in this embodiment, the water collecting plates 15 and 16 extend only in the north-south direction, but may extend in the east-west direction or both east-west north-south directions. The two water collecting plates 15 and 16 incline downward toward the central side of the water storage tank 14, and further, each of the water collecting plates 1
A rainwater guide portion 17a constituted by a gap C of about 10 to 20 mm is provided at the lowermost ends of the water collecting plates 1 and 5.
Rainwater collected on 5th and 16th, collected rainwater 1
1 is prevented from evaporating.

Solar cells 17 are arranged side by side on the water collecting plates 15 and 16. The electric power generated by the solar cell 17 is sent to the control device 18. Control device 1
A storage battery, a charge control unit, and a pump control unit (not shown) are provided in each of the units 8. The electric power generated by the solar battery 17 charges the storage battery via the charge control unit and is required by operating the operation panel switch 19. In this case, the storage battery is used as a power source to supply power to the pump 20 by the pump control unit. A sprinkler 21 is connected to the pump 20 via a stop valve 20a and a hose 22 so that water can be sprinkled on the flowerbed 23 or the like if necessary, and can be used for car washing or the like. The water suction pipe 2 of the pump 20
The tip of 4 is arranged in the vicinity of the inner bottom of the water storage tank 14 and has a structure capable of draining all the water in the water storage tank. A container) may be provided and the end portion of the water absorption pipe 24 may be arranged therein. The water inlet of the overflow pipe 13 is provided in the upper portion of the side wall 12 and has a structure for draining the overflowed water from the lower portion into the drain groove 25.

Therefore, in the rainwater utilizing apparatus 10, rainwater that falls on the water collecting plates 15 and 16 (directly on the solar cells 17) is caused by the downward inclination (gradient) of the water collecting plates 15 and 16. It flows downward, flows into the water tank 14 from the rainwater guide portion 17a, and accumulates in the water tank 14. When a large amount of rainwater flows in, it is drained to the outside through an overflow pipe 13 provided on the upper portion of the side wall 12. Rainwater guide 1
7a prevents the water accumulated inside from evaporating. You can use a net or screen to prevent insects from entering the rainwater guide. The water collecting plates 15 and 16 prevent the water accumulated inside from evaporating, further prevent the direct sunlight from hitting the water tank 14, and convert the direct sunlight into electric power by the solar cell 17 on the upper surface thereof. This considerably reduces the heating of the water in the water tank 14, but if necessary, a heat insulating material may be provided inside or on the back surface of the water collecting plates 15 and 16 (in the following embodiments). The same). And
Since the water collecting plates 15 and 16 extend to the outside of the water storage tank 14, the side walls 12 of the water storage tank 14 are not exposed to the water during the daytime.
You can mitigate direct sunlight from around 3:00.

Next, a rainwater utilizing apparatus 26 according to a second embodiment of the present invention shown in FIG. 2 will be described. The same components as those in the above-mentioned embodiment are designated by the same reference numerals and will be described. It is omitted (same in the following embodiments). In this rainwater utilization device 26, the rainwater guide portion 17a of the rainwater utilization device 10 according to the first embodiment is further improved, and the rainwater guide portion 27 is constituted by a vertical pipe, and the lower end portion which serves as a drainage port thereof. To the lower position of the water tank 14. As a result, it is possible to prevent the water accumulated in the water storage tank 14 from directly contacting the outside air, and it is possible to effectively prevent the evaporation from being suppressed. In this embodiment, side plates 28 and 29 are provided on both sides (east-west direction) of the water collecting plate 15 whose front end is located below the water collecting plate 16 to prevent rainwater from flowing down to the side. ing. Further, a vertical plate 30 is provided at the tip of the water collecting plate 15 to eliminate a gap between the water collecting plate 16 and the water collecting plate 16 placed thereon, and guide the rainwater to the rainwater guiding portion 27. Therefore, in the rainwater utilization device 26, the water collecting plates 15, 1
The rain that has fallen on 6 flows along with the downward slope and flows into the rainwater guide portion 27 which is a vertical pipe. When water accumulates in the water tank 14, only the water surface of the rainwater guide portion 27 comes into contact with the atmosphere,
Since the water in the water storage tank 14 does not come into direct contact with the atmosphere, the water that has accumulated is prevented from evaporating.

Next, a rainwater utilizing apparatus 32 according to a third embodiment of the present invention shown in FIG. 3 will be described. The rainwater utilization device 32 is the rainwater utilization device 1 according to the above embodiment.
It is a further development of 0 and 26, and the water tank 14 is a pedestal 3
It is placed on top of No. 3 and has a certain drop from the ground. As a result, water can be sprinkled by the hose 35 or the like provided on the bottom of the water storage tank 14 via the faucet 34. In addition, 35a shows a sprinkler. Also, the water tank 1
4, the first and second additional tanks 36 and 37 are provided at the same height position, and these are connected by upper and lower connecting pipes 38 to 41. The lower connecting pipes 39, 41 are provided with stop valves 42, 43 which are normally closed. Faucets 44 and 45 are provided at the bottoms of the respective additional tanks 36 and 37, and the overflow pipe 13 is further provided to the lowest additional tank 37. The overflow pipe 13 may be attached to any of the water storage tank 14 and the first and second expansion tanks 36 and 37 as long as it is located at a position slightly higher than the positions of the connecting pipes 38 and 40.

The first and second additional tanks 36 and 37 are provided on pedestals 46 and 47, the pump 20 is placed on an auxiliary pedestal 48, and a control device 18 is provided in the vicinity thereof. The higher the height of the mounts 33, 46, 47 is, the larger the head is, but economically, it is preferably about 1 to 10 m. Since the equipment cannot be operated when the mount is raised, the auxiliary mount 48 is provided at a lower position of the mount 33, and the faucet 34, the first,
The faucets 44 and 45 attached to the bottoms of the second expansion tanks 36 and 37 need to be arranged at positions where workers can reach them by piping or the like. A ball valve is used so that the stop valves 42 and 43 can be operated from the ground, and a string or the like is attached to the operation handle so that the stop valve can be operated from the ground. The first and second expansion tanks 36 and 37 may be placed outdoors, but may be placed indoors. This rainwater utilization device 32 is
Rainwater is collected by the water collecting plates 15 and 16 and stored in the water storage tank 14, and the rainwater overflowing the water storage tank 14 is sequentially connected to the first and second expansion tanks 36 and 37 by connecting pipes 38 and 40.
Is stored via. The additional tank does not need to be installed in the vicinity of the water tank 14, and if it is installed in a remote place, rainwater can be used at the same time in a remote place. Water tank 1 when pressured water is needed like car wash
When the water of No. 4 is used and the water in the water tank 14 is used up, the stop valves 42 and 43 are opened and the rainwater in the first and second expansion tanks 36 and 37 is replenished. In addition, when the rainwater in the first and second expansion tanks 36, 37 runs out during use, rainwater can be replenished from the water tank 14 or another expansion tank by opening the stop valve 42 or 43. it can.

Next, referring to FIG. 4, the fourth embodiment of the present invention will be described.
The rainwater utilization device 52 according to the embodiment will be described. In this rainwater utilization device 52, a water collecting plate 53, which is an example of a water collecting member provided on the water storage tank 14, has five sides on one side.
The slope is 30 degrees. The solar cell 17 is placed on the water collecting plate 53, and the generated electric power is sent to the control device 18 having a storage battery. A water collecting gutter 5 is provided at the downstream end of the water collecting plate 53.
4 is provided to send rainwater to the bottom of the water tank 14 via the rainwater guide pipe 55. A rainwater guide portion 56 is configured by including the water collecting trough 54 and the rainwater guide pipe 55. Although one rainwater guide tube 55 may be provided, a plurality of rainwater guide tubes 55 may be provided at appropriate intervals. A heat insulating material 57 is provided below the water collecting plate 53 to block the heat transmitted through the water collecting plate 53. The water collecting plate 53 is a plan view of the four side walls 1 of the water tank 14.
2 to the outer side of about 0.2 to 0.8 m. In particular, in this embodiment, the downward direction of the water collecting plate 53 is the south side so that the solar cells 17 are effectively exposed to sunlight. Although the projecting length of the water collecting plate 53 is about 0.1 to 0.5 times the height H of the water storage tank 14 as described above, the water collecting plate 53 particularly in the south direction becomes longer, Water tank 14
It also plays a role as an awning that substantially prevents the sunlight from hitting the side wall 12 on the south side of the sun during the daytime 0 to 3 o'clock in midsummer.

An overflow pipe 13 is provided above the side wall 12 of the water storage tank 14 so that the overflow water is drained from the lower portion to the drainage groove 58. Backflow is prevented at the lower end of the overflow pipe 13. The valve 13a is connected. The overflow pipe may be extended to the inside of a water collecting pit (an example of a water container) provided in the drainage groove, whereby the outlet side of the overflow pipe may be water-sealed. Further, a vent 58a is provided above the side wall 12 of the water storage tank 14, and the vent 58a is provided with a filter member for preventing invasion of insects such as mosquitoes. Therefore, in the rainwater utilization device 52, the rainwater that has fallen on the water collecting plate 53 flows along the downward slope, and the rainwater guiding pipe 55 is drawn from the water collecting trough 54.
And flows into the water tank 14. At this time, the water tank 1
The air in the chamber 4 goes out through the vent 58a. Water tank 14
Rainwater that overflows through the overflow pipe 13 is discharged to the outside. When a little water collects in the water tank 14, the end of the rainwater guide pipe 55 is water-sealed, and further, the backflow prevention valve 13a is connected to the end of the overflow pipe 13, and the vent 58a is protected from insects. Since the filter member is provided, there is no concern that mosquitoes, etc. will enter the water storage tank 14 and generate a bow hula. In order to completely prevent invasion of mosquitoes, it is preferable to dispose a filter member also at the inlet of the rainwater guide pipe 55. The ceiling of the water tank 14 is also covered with the water collecting plate 53, and the water collecting plate 53 is provided with the heat insulating material 57, so that the rainwater 11 accumulated in the water tank 14 is prevented from evaporating. Also, the temperature rise of the rainwater 11 in the water tank 14 is prevented. An additional tank can be further provided in the water tank 14 of the rainwater utilizing device 52, and the connecting pipe 39 and the stop valve 42 are used.

Next, a rainwater utilizing apparatus 60 according to a fifth embodiment of the present invention shown in FIGS. 5A to 5C will be described. As shown in FIG. 5A, the water tank 14 is a building 61.
Water collecting plate 6 which is arranged on the upper surface and is an example of one of the water collecting members
A solar water heater 63 is arranged on the second side. In addition, an auxiliary tank 64, which is larger than the water storage tank 14 and has a large capacity, is provided underground, and overflow water from the water storage tank 14 flows into the auxiliary tank 64 through an overflow pipe 65. On the upper side of the auxiliary tank 64, an overflow port 66 for discharging the overflow portion to the outside (for example, a drain groove) is provided. A pumping pump 67 is provided in the auxiliary tank 64 and automatically pumps water when the water level in the water storage tank 14 is lowered to fill the water in the water storage tank 14 as much as possible. Reference numerals 68 and 69 denote level sensors in the water tank 14, and when the lower level sensor 68 is activated, the pump of the pump 67 is turned on,
When the upper level sensor 69 operates, the pumping pump 67 stops. The auxiliary tank 6
Another level sensor 70 is provided at the bottom of the pump 4, and when the water in the auxiliary tank 64 is insufficient, the pump 6
7 is not allowed to drive.

A water supply pump 71 is provided in the lower portion of the water storage tank 14 described above, and a pressure sensor detects when the pressure of the solar water heater system drops, such as when the hot water of the solar water heater 63 is used. The water supply pump 71 operates,
The water in the water tank 14 is automatically supplied to the solar water heater 63. When the lower level sensor 68 operates, the water supply pump 71 does not operate,
As shown in FIG. 5 (B) and FIG. 5 (C), the electric three-way valve 71a provided in the water supply pipe is switched to the city water (that is, tap water) direction, and the city water is supplied to the solar water heater 63. It is designed to prevent hot water from becoming unavailable due to lack of stored rainwater. In FIG. 5, 71b is a check valve, 71c is a purification filter, and 71d is a pressure sensor. The water pipe 72 pumped from the water pump 67 is provided with a stop valve 73, a faucet 74, and a manual switch (not shown) for the water pump 67 in the middle.
The rainwater in the auxiliary tank 64 can be used anytime. As a power source for the pumping pump 67 and the water supply pump 71, it is preferable to use the electric power generated by the solar cell 17 by accumulating it in a storage battery. However, in addition to the electric power from the solar cell 17, an auxiliary commercial power source may be used. it can.

The present invention is not limited to the above-mentioned embodiments, and for example, rainwater utilization devices 10 according to the first to fifth embodiments, without departing from the scope of the invention.
The present invention is also applicable to the case where a part of 26, 32, 52, 60 is replaced or used in combination. Furthermore, although the embodiments of the present invention have been described using specific numbers, the present invention is not limited to these numbers.

[0019]

As is apparent from the above description, the rainwater utilization apparatus according to the first to eighth aspects of the invention has the water collecting member disposed above the water tank, so that the evaporation of water in the water tank is prevented. It can prevent and store water. Since the solar cell is provided on the water collecting member, the installation space can be effectively used. Further, the electric power of the solar cell can be used as a power source for a pump that draws water from the water storage tank. For example, this rainwater utilization device can be installed in a field or grassland in the suburbs where there is no power source for irrigation. Particularly, in the rainwater utilization apparatus according to the second aspect, the water collecting member is composed of a plurality of water collecting plates, is inclined toward the inside of the water storage tank, and a part of the water collection member is extended from the water storage tank. Therefore, water collection is performed efficiently.

In the rainwater utilizing apparatus according to claim 3,
The rainwater guide part consists of a rainwater guide pipe, the lower end of which extends to the lower position of the water storage tank, the check valve is connected to the lower end of the overflow pipe of the water storage tank, and the filter material is attached to the upper part of the water storage tank. A ventilation port is provided so as to be shielded from the outside. Therefore, ventilation can be secured in the water tank by the ventilation port, and the other portions are water-sealed, so that insects and the like can be prevented from flying and entering the inside. In the rainwater utilization apparatus according to claim 4, one large-capacity tank is installed in the water tank by providing one or two or more additional tanks, which are connected by connecting pipes, at the same height position. Even if there is no gathered space, small tanks can be arranged in a vacant space so that a large amount of rainwater can be stored. Moreover, the connecting pipe connects the lower position and the upper position of the water storage tank and the additional tank, and a stop valve is provided in the connecting pipe in the lower position. It can be a system of preferential use of water tank.
On the other hand, if the stop valve is opened, all the water tanks are integrated, and the substantial volume of the water tank can be increased.

In the rainwater utilization apparatus according to claim 5,
Since the heat insulating material is arranged inside or on the lower surface side of the water collecting plate, rainwater in the water storage tank is rarely heated by direct sunlight in summer, and does not become hot water. Further, in the rainwater utilizing apparatus according to claim 6, since the water collecting member is an awning which substantially prevents the sunlight from hitting the side wall of the water tank during the daytime 0 to 3 o'clock in midsummer, Further, it is possible to prevent the temperature rise in the water storage tank.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a rainwater utilization device according to a first embodiment of the present invention.

FIG. 2 is a partial perspective view of a rainwater utilization device according to a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of a rainwater utilization device according to a third embodiment of the present invention.

FIG. 4 is an explanatory diagram of a rainwater utilization device according to a fourth embodiment of the present invention.

FIG. 5 is an explanatory diagram of a rainwater utilization device according to a fifth embodiment of the present invention.

[Explanation of symbols]

10: rainwater utilization device, 11: rainwater, 12: side wall, 13:
Overflow pipe, 13a: check valve, 14: water tank, 15, 16: water collecting plate, 17: solar cell, 17a: rainwater guide, 18: control device, 19: operation panel switch, 2
0: Pump, 20a: Stop valve, 21: Sprinkler, 2
2: Hose, 23: Flower bed, 24: Water absorption pipe, 25: Drain, 26: Rainwater utilization device, 27: Rainwater guide, 28, 2
9: Side plate, 30: Vertical plate, 32: Rainwater utilization device, 33: Stand, 34: Faucet, 35: Hose, 35a: Sprinkler, 3
6, 37: Expansion tank, 38-41 connecting pipe, 42, 4
3: Stop valve, 44, 45: Faucet, 46, 47 mount,
48: auxiliary mount, 52: rainwater utilization device, 53: water collecting plate,
54: water collecting gutter, 55: rainwater guide pipe, 56: rainwater guide section,
57: heat insulating material, 58: drainage groove, 58a: vent hole, 60:
Rainwater utilization device, 61: building, 62: water collecting plate, 63: solar water heater, 64: auxiliary tank, 65: overflow pipe, 66: overflow port, 67: pumping pump, 68
-70: Level sensor, 71: Water supply pump, 71a:
Electric 3-way valve, 71b: check valve, 71c: purification filter, 71d: pressure sensor, 72: water pipe, 73: stop valve, 74: faucet

Claims (8)

[Claims] 1. A water tank which stores rainwater and is provided with an overflow pipe at an upper portion of a side wall thereof and a water tank which is arranged so as to cover the water tank and covers the upper portion of the water tank in plan view. A member, a rainwater guide portion for guiding the rainwater collected by the water collecting member to the water tank, a solar cell arranged side by side on the water collecting member, a pump for pumping water from the water tank, A rainwater utilization apparatus comprising: a storage battery that stores electric power generated by a solar cell, and a control device that drives the pump by the electric power generated by the solar cell. 2. The rainwater utilization apparatus according to claim 1,
The water collecting member is composed of a plurality of water collecting plates, and each water collecting plate has a downward slope toward the inside of the water storage tank, extends to the outside of the water storage tank, and has an end of the downward slope. A rainwater utilization device, characterized in that the part is the rainwater guide part. 3. The rainwater utilization device according to claim 1 or 2, wherein the rainwater guide portion includes a rainwater guide pipe, and a lower end portion of the rainwater guide pipe is extended to a lower position of the water storage tank, and the overflow pipe of the water storage tank is provided. A rainwater utilization device, characterized in that a backflow prevention valve is connected to a lower end portion thereof, and further, a ventilation port, which is cut off from the outside by a filter material, is provided above the water storage tank. 4. The rainwater utilization apparatus according to claim 1, wherein the water tank has one or more extension tanks connected at the same height position by connecting pipes. Further, the connecting pipe connects the lower position and the upper position of the water storage tank and the additional tank,
Moreover, the rainwater utilization device is characterized in that a stop valve is provided in the connecting pipe connecting the lower positions. 5. The rainwater utilizing device according to claim 1, wherein a heat insulating material is arranged inside or on the lower surface side of the water collecting member. 6. The rainwater utilization apparatus according to claim 1, wherein the water collecting member projects from a side wall of the water storage tank, and the sunlight shines during the daytime 0 to 3 o'clock in midsummer. A rainwater utilization device, which is a sunshade that substantially prevents it from hitting a water tank. 7. The rainwater utilization device according to claim 1,
Further, a solar water heater arranged on the water collecting member, a water supply pump for supplying the water in the water tank to the solar water heater, and a water supply pump provided at a position lower than the water tank, from the water tank. A rainwater utilization device comprising: an auxiliary tank for collecting overflow water by the overflow pipe; and a pump for pumping water collected in the auxiliary tank to the water storage tank. 8. The rainwater utilization apparatus according to claim 7,
A rainwater utilization device, wherein electric power generated by the solar cell is used for power sources of the water supply pump and the pumping pump.