JP3437720B2 - Rainwater storage device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with two water tanks, a main tank and an auxiliary tank, as a water tank for storing rainwater, and the rainwater that begins to fall is stored only in the auxiliary tank, and the auxiliary tank is full. Occasionally, it relates to a rainwater storage device that stores subsequent rainwater in a main tank.

[0002]

2. Description of the Related Art Conventionally, a rainwater storage device described in, for example, Japanese Utility Model Laid-Open No. 6-30256 is known. In this rainwater storage device 100, as shown in FIG. 14, the rainwater that begins to fall (initial rainfall) collected by a water collecting unit (not shown).
First flows down the inflow pipe 101 and the inflow pipe 101 a and flows into the auxiliary tank 102. This auxiliary tank 1
A float 103 that floats on the water storage surface is provided in 02, and this float 103 is provided with an inlet 102a of the auxiliary tank 102 when the auxiliary tank 102 is filled with water.
To stop the inflow of rainwater. After that, the rainwater flows into the main tank 104 via the inflow pipe 101 and the inflow pipe 101b and is stored therein. With this configuration, in the rainwater storage device 100, the initial rainfall that tends to be contaminated by dust in the atmosphere, dirt in the water collecting portion, etc. is stored only in the auxiliary tank 102, and when the inside of the auxiliary tank 102 becomes full, The subsequent rainfall, which is cleaner than the rainfall, is stored in the main tank 104.

Further, a faucet 104a is provided at the lower end of the main tank 104. By manually opening the faucet 104a, rainwater in the main tank 104 can be used as miscellaneous water. Further, an overflow port 104b is provided at the upper end of the main tank 104,
When the inside of the main tank 104 becomes full, excess rainwater is drained from the overflow port 104b. In addition, the initial rainfall with poor water quality stored in the auxiliary tank 102 is drained by manually opening the drain cock 102b.

[0004]

In the above-mentioned prior art, draining rainwater in the auxiliary tank 102 is manually performed, which is troublesome. Further, since the float 103 is used as a means for switching the flow path of the inflow pipe 101 from the side of the auxiliary tank 102 to the main tank 104, a large amount of rain continuously falls from the beginning of the rain, and the inside of the auxiliary tank 102 is filled with water at once. However, if the amount of rainfall per one time is small and the auxiliary tank 102 becomes full due to several rainfalls that are separated by a considerable amount of time, rainwater with poor water quality will be stored in the main tank 104. May be stored. For example,
If the auxiliary tank 102 is in a state just before full water due to the last rainfall, and if rainfall occurs in this state,
The auxiliary tank 102 may soon become full of water due to a very small amount of initial rainfall, the flow path of the inflow pipe 101 may switch to the main tank 104 side, and initial rainfall of poor water quality may flow into the main tank 104 side. In this case, the main tank 104
There is a problem that rainwater with poor water quality is stored therein and a large amount of sediment such as dust is accumulated on the bottom of the main tank 104, so that frequent maintenance is required and maintenance is very troublesome. Also, the main tank 10
Since the water quality of the rainwater in 4 is poor, there is a problem that the use is limited when the rainwater is used as miscellaneous water.

Further, from the overflow port 104b provided in the main tank 104, insects, dust, etc.
The water quality of the rainwater stored in the main tank 104 may deteriorate. Even if a wire mesh (not shown) is attached to the overflow port 104b,
Since small insects and dust may slip through the wire net, it is difficult to completely prevent deterioration of the quality of rainwater stored in the main tank 104.

The present invention has been made to solve the above problems, and it is possible to easily perform drainage of an auxiliary tank and maintenance of a main tank, and to store rainwater of relatively good quality in the main tank. The purpose is to provide a device.

[0007]

According to a first aspect of the present invention, there is provided a rainwater storage device comprising: a water collecting portion for collecting rainwater; a water pipe connected to the water collecting portion; and a water pipe through which the collected rainwater flows down. A main tank and an auxiliary tank that are connected to each other and store rainwater that flows down the water supply pipe, and an automatic switching valve that is provided in the water supply pipe and that switches the flow path of the water supply pipe to one of the auxiliary tank side and the main tank side, and the auxiliary tank An auxiliary tank sensor that is provided to detect whether the amount of water stored in the auxiliary tank is greater than or equal to a predetermined amount, a drain pipe that is provided at the lower end of the auxiliary tank to drain rainwater in the auxiliary tank, and a drainage An automatic drainage valve installed on the pipe to open and close the drainage pipe, and a rainfall detector to detect the presence or absence of rainfall.
By driving the automatic switching valve according to the detection signal from the rain sensor and the auxiliary tank sensor, when the amount of water stored in the auxiliary tank is less than the predetermined amount, the flow path of the water supply pipe is held on the auxiliary tank side, When the amount of water stored in the auxiliary tank reaches a predetermined amount, the flow path of the water supply pipe is switched to the main tank side, and when the amount of water stored in the auxiliary tank reaches a predetermined amount, the automatic drain valve is driven to open. Open the drain pipe and from the rainfall sensor
According to the detection signal of the
To close the drain pipe, and when there is no rainfall, drain it automatically.
A control device that opens the drain pipe by driving the water valve to open,
Equipped with a.

According to this rainwater storage device, first, the rainwater collected in the water collecting portion flows down the water supply pipe, and passes through the flow path of the water supply pipe switched to the auxiliary tank side by the automatic switching valve to assist the rainwater. Can be stored in the tank. The control device drives the automatic switching valve according to the detection signal of the auxiliary tank sensor provided in this auxiliary tank, and when the amount of water stored in the auxiliary tank is less than the predetermined amount, the flow path of the water supply pipe is set to the auxiliary tank side. And keep rainwater in the auxiliary tank. When the amount of water stored in the auxiliary tank reaches a predetermined amount, the automatic switching valve is driven to switch the flow path of the water supply pipe to the main tank side to store rainwater in the main tank and open the automatic drain valve. Drive to open the drain pipe and drain the rainwater stored in the auxiliary tank.
With this, the rainwater stored in the auxiliary tank can be automatically drained without the need for manpower, which facilitates draining of the auxiliary tank. In addition, the controller
Depending on the detection signal of the rain sensor, when it rains, the automatic drain valve
Close the drain pipe by driving it closed, and when there is no rainfall
Open the drain pipe by driving the automatic drain valve to open. did
Therefore, for example, the amount of rainfall per event is small and the time
If there are several separate rains, each
The automatic drain valve opens the drain pipe to the rainwater in the auxiliary tank.
Because it drains, it is possible that the auxiliary tank
The amount of stored water does not reach the specified amount,
Predetermined amount in the auxiliary tank only when it rains continuously
Rainwater is stored, and then the flow path of the water pipe is on the main tank side.
Can be switched to. As a result, the flow path of the water pipe is the main tank.
When switching to the black side, the initial rainfall is severe.
It will not flow into the main tank,
It is possible to store rainwater of relatively good quality without fail.
Moreover, maintenance of the main tank becomes easy. Also, the main
Since the water quality of rainwater inside the tank will be better than before,
When used as miscellaneous water, it has a wide range of uses.

[0009]

[0010]

Further, in the above, the rainwater storage device is further provided in the main tank, and further comprises a main tank sensor for detecting whether or not the amount of water stored in the main tank is a predetermined amount or more, and the control device is In response to the detection signal from the main tank sensor, when the amount of water stored in the main tank reaches a predetermined amount, the automatic switching valve is driven to switch the flow path of the water pipe to the auxiliary tank side, and the automatic drain valve is turned on. It is preferable to open the drain pipe by driving the opening.

According to this rainwater storage device, the control device drives the automatic switching valve to drive the flow of the water pipe when the stored water amount in the main tank reaches a predetermined amount in response to the detection signal from the main tank sensor. The drainage pipe is opened by switching the passage to the auxiliary tank side and opening and driving the automatic drain valve, so rainwater that does not exceed the specified amount does not flow into the main tank, and unnecessary rainwater that flows into the auxiliary tank However, it is automatically drained from the drain pipe. This eliminates the need to provide an overflow port in the main tank, unlike in the past, so that insects, dust, etc. do not enter the main tank through the overflow port and deteriorate the quality of rainwater in the main tank. , The water quality can be maintained. Maintaining such water quality further facilitates maintenance of the main tank.

[0013]

DETAILED DESCRIPTION OF THE INVENTION Referring to the accompanying drawings,
A rainwater storage device according to an embodiment of the present invention will be described. FIG. 1 is a schematic diagram showing the configuration of a rainwater storage device 1 of the present invention. As shown in the figure, the rainwater storage device 1 receives a rainfall from the roof R and collects water from the gutter 2 as a water collecting part.
And an auxiliary tank 3 and a main tank 4 for receiving and storing rainwater from the gutter 2, respectively. This gutter 2
A rainfall sensor SE1 for detecting the presence or absence of rainfall is provided inside the. This rain sensor SE1 changes its detection signal to ON / OFF depending on the presence or absence of rain. When there is no rain, the detection signal is in the OFF state, and when the rain is detected, the detection signal is OFF. The state changes to the ON state. The detection signal of the rainfall sensor SE1 is input to the control device 6 described later.

Further, a water pipe 5 through which the rainwater collected in the gutter 2 flows down is connected to the bottom of the gutter 2, and the water pipe 5 is connected via a three-way valve V1 as an automatic switching valve. 2 water supply pipes 5a, 5b, and the branched water supply pipes 5a, 5b
5b is connected to the auxiliary tank 3 and the main tank 4, respectively. The three-way valve V1 is, for example, an air-driven three-way valve that uses an electromagnetic valve and instrument air, which are not shown, and is driven by a drive signal from the control device 6 to be described later so as to open the flow path of the water supply pipe 5. , The auxiliary tank 3 side is switched to the main tank 4 side, and when there is no drive signal from the control device 6 even when the power is turned off, the flow path of the water supply pipe 5 is always communicated with the auxiliary tank 3 side. Has been done.

The auxiliary tank 3 is provided at a predetermined height position on the inner surface of the side wall thereof, and is provided at the bottom of the auxiliary tank 3 and an auxiliary tank sensor SE2 used for detecting the amount of water stored in the auxiliary tank 3. , A drain pipe 7 for draining rainwater in the auxiliary tank 3, and a drain pipe 7 provided in the drain pipe 7.
And an electromagnetic valve V2 as an automatic drain valve that opens and closes. The detection signal of the auxiliary tank sensor SE2 is turned on / off on condition that the amount of water stored in the auxiliary tank 3 is a predetermined amount (for example, the amount of water that fills the auxiliary tank 3).
When the amount of water stored in the auxiliary tank 3 is less than the predetermined amount, the detection signal is OFF, and when the amount of water stored in the auxiliary tank 3 reaches the predetermined amount, the detection signal is changed. Change from OFF state to ON state. The detection signal of the auxiliary tank sensor SE2 is input to the control device 6 described later.

The solenoid valve V2 is a normally-open solenoid valve, and when excited by a drive signal from the control device 6 which will be described later, the drain pipe 7 is closed and the control device 6 includes the time when the power is turned off. When there is no drive signal from the
Is opened to drain the rainwater in the auxiliary tank 3. Further, the drain pipe 7 extends to a drain groove (not shown), and drains rainwater to this drain groove.

The main tank 4 is provided at a predetermined height position on the inner surface of the side wall of the main tank 4, and a main tank sensor SE3 used to detect the amount of water stored in the main tank 4 and the main tank 4 are provided.
And a faucet V3 provided at the lower end of the main tank 4 for discharging rainwater in the main tank 4 by twisting a handle by an operator. The detection signal of the main tank sensor SE3 is ON / OFF on condition that the amount of water stored in the main tank 4 is a predetermined amount (for example, the amount of water that fills the main tank 4).
When the amount of water stored in the main tank 4 is less than the predetermined amount, the detection signal is OFF, and when the amount of water stored in the main tank 4 reaches the predetermined amount, the detection signal is changed. Change from OFF state to ON state. The detection signal of the main tank sensor SE3 is also input to the control device 6 described later.

Further, the control device 6, as shown in FIG.
C for executing the control program of FIGS. 5 to 13 described later
PU60 and ROM storing this control program
61, a RAM 62 for temporarily storing calculation data used when executing each control program, and a three-way valve V1
And an interface circuit 63 having a drive circuit for outputting a drive signal for driving the solenoid valve V2, an I / O port (not shown) for inputting detection signals of the sensors SE1, SE2, SE3, and the like, It is configured as a microcomputer provided with. This control device 6
Is based on the control program, sensors SE1, SE2,
A drive signal is output to the three-way valve V1 and the solenoid valve V2 via the interface circuit 63 according to the ON / OFF state of the detection signal input from SE3, thereby controlling the operation of the rainwater storage device 1.

The control operation of the control device 6 configured as described above will be described with reference to the flowcharts of FIGS. 5 to 13. FIG. 5 is a flowchart showing the main program of the control device 6. In this main program, first, when the rainwater storage device 1 is powered on, it is held in an initialization state in which drive signals to the three-way valve V1 and the solenoid valve V2 are not output. As a result, the three-way valve V1
Is held in a state where the flow path of the water supply pipe 5 is on the side of the auxiliary tank 3, and the solenoid valve V2 is held in a state where the drain pipe 7 is opened (steps S1 and S2). Next, in step S3, the detection signals input from the sensors SE1, SE2, SE3 to the control device 6 are changed from ON to OFF, or O
It is determined whether or not it has changed from FF to ON.

This determination is made based on the result of the "interrupt processing" routine shown in FIG. 6, which is executed by interrupting the processing of the main program at predetermined time intervals. In this interrupt processing routine, first, step S10
Then, it is determined whether or not the ON / OFF state of the detection signal of the rainfall sensor SE1 has changed.

In the "signal change determination of the sensor SE1" routine of this step S10, for example, at the time of execution at a certain time, it is detected that the detection signal of the rainfall sensor SE1 has changed from OFF to ON, for example. When the detection signals of the rainfall sensor SE1 are all in the ON state during the execution of this step S10 a predetermined number of times, it is determined that the detection signal of the rainfall sensor SE1 has changed from OFF to ON for the first time at that time. This means, for example, when it starts to rain
The output state of the detection signal of the rainfall sensor SE1 is not stable,
Since ON / OFF may be repeated, based on this detection signal, the three-way valve V1 and the solenoid valve V are
When 2 is driven, chattering etc. occurs and the 3-way valve V
This is to prevent this from shortening the life of the solenoid valve 1 and the solenoid valve V2.

Next, in step S11, step S10
Similarly, the detection signal of the auxiliary tank sensor SE2 is turned ON /
It is determined whether or not the OFF state has changed, and then, in step S12, similarly to step S10, it is detected whether or not the ON / OFF state of the detection signal of the main tank sensor SE3 has changed. In step S11, "Sensor S"
Also in the "E2 signal change determination" routine and the "Sensor SE3 signal change determination" routine in step S12,
For the same reason as described in step S10 above, a change in the ON / OFF state of the detection signal is detected at a certain point in time, and the state after the change in the detection signal is detected when the steps S11 and S12 are executed a predetermined number of times thereafter. Is maintained,
At that time, it is determined that the output state of the detection signal has changed.

According to such an "interrupt processing" routine, when the determination in step S3 of FIG. 5 is "YES", that is, the ON / OFF state of the detection signal is detected in at least one of the detection signals of the sensors SE1, SE2, SE3. If changed, the "valve drive" routine is executed in step S4, and if the determination is "NO", the process returns to step S3. This "valve drive" routine is shown in FIG.
First, in step S20, it is determined whether or not the detection signal of the rainfall sensor SE1 has changed from OFF to ON.

When the determination in step S20 is "YES", that is, the detection signal of the rainfall sensor SE1 is OFF.
If it changes from ON to ON, it is determined that rainfall has occurred, and the "SE1.ON valve drive" routine of step S21 is executed. In this "SE1 ON valve drive" routine, as shown in FIG.
As shown in step S210, the three-way valve V1 is set to the auxiliary tank 3 side in step S210, a drive signal is output to the electromagnetic valve V2 to close the electromagnetic valve V2 in step S211, and this routine ends. This three-way valve V1 is the auxiliary tank 3 side, and the solenoid valve V
By closing 2, the auxiliary tank 3 is ready to store water, and rainwater flows down from the roof R as shown in FIG.
It is collected in the gutter 2 and stored in the auxiliary tank 3.

When the determination in step S20 is "NO", that is, the detection signal of the rainfall sensor SE1 is OFF.
If it has not changed from ON to ON, the process proceeds to step S22, where the detection signal of the rainfall sensor SE1 changes from ON to OFF.
It is determined whether it has changed to. If the determination in step S22 is “YES”, that is, if the detection signal of the rainfall sensor SE1 changes from ON to OFF, it is determined that the rainfall has ended, and “SE1 · OFF” in step S23.
Run the "valve drive" routine. This "SE1 OFF
In the "valve drive" routine, as shown in FIG.
At 230, the three-way valve V1 is set to the auxiliary tank 3 side, and at step S231, the output of the drive signal to the solenoid valve V2 is stopped to open the solenoid valve V2, and this routine ends. In this way, by opening the solenoid valve V2 with the three-way valve V1 on the side of the auxiliary tank 3, the rainwater in the auxiliary tank 3 is drained. Therefore, when there is no rainfall, the auxiliary tank 3 is always kept empty. To be done. As a result, unlike the conventional rainwater storage device, a predetermined amount of rainwater is not stored in the auxiliary tank 3 due to several rainfalls over a period of time, and when rain continuously falls from the beginning of the rain. Only auxiliary tank 3
A certain amount of rainwater is stored inside.

If the determination in step S22 is "NO", that is, if the detection signal of the rainfall sensor SE1 has not changed from ON to OFF, the process proceeds to step S24 and the detection signal of the auxiliary tank sensor SE2 is changed. It is determined whether or not it has changed from OFF to ON. This step S24
If the determination is “YES”, that is, if the detection signal of the auxiliary tank sensor SE2 changes from OFF to ON, this means that a predetermined amount of rainwater has been stored in the auxiliary tank 3, and “ SE2 ON valve drive "routine is executed. In this "SE2.ON valve drive" routine, as shown in FIG.
A drive signal is output to the three-way valve V1 to set the three-way valve V1 to the main tank 4 side, and in step S251, the solenoid valve V2 is opened,
This routine ends. Thereby, as shown in FIG. 3, rainwater flows down to the main tank 4 side through the water supply pipe 5 and the three-way valve V1 and is stored in the main tank 4. At this time,
The dirty initial rainfall is already stored in the auxiliary tank 3, and the main tank 4 stores subsequent rainwater that is cleaner than the initial rainfall. Further, since the solenoid valve V2 is opened at this time, the dirty initial rainfall stored in the auxiliary tank 3 is automatically drained.

On the other hand, when the determination in step S24 is "NO", that is, the detection signal of the auxiliary tank sensor SE2 is
If it has not changed from OFF to ON, step S
26, the detection signal of the auxiliary tank sensor SE2 is turned on.
It is determined whether the change from OFF to OFF. If the determination in step S26 is "YES", that is, if the detection signal of the auxiliary tank sensor SE2 changes from ON to OFF, this indicates a state where drainage in the auxiliary tank 3 has started. Therefore, in step S27, “SE2O
The "FF valve drive" routine is executed. This "SE2 O
In the “FF valve drive” routine, as shown in FIG.
The states of the one-way valve V1 and the solenoid valve V2 are maintained as they are (steps S270 and 271), and this routine ends. Thereby, the drainage in the auxiliary tank 3 is continued.

When the determination in step S26 is "NO", that is, the detection signal of the auxiliary tank sensor SE2 is
If it has not changed from ON to OFF, step S
28, the detection signal of the main tank sensor SE3 is turned off
It is determined whether the change from ON to ON. This step S
If the determination in step 28 is “YES”, that is, if the detection signal of the main tank sensor SE3 changes from OFF to ON, this means that a predetermined amount of rainwater has been stored in the main tank 4, and the determination in step S29 is performed. Execute the "SE3 ON valve drive" routine. In step S29, "SE3.
In the "ON valve drive" routine, as shown in FIG. 12, the three-way valve V1 is switched to the auxiliary tank 3 side in step S290, the electromagnetic valve V2 is opened in step S291, and this routine ends. As a result, no more than a predetermined amount of rainwater is stored in the main tank 4, and unnecessary rainwater is drained from the drain pipe 7 of the auxiliary tank 3, so it is necessary to provide an overflow port in the main tank 4. Disappear.

When the determination in step S28 is "NO", that is, the detection signal of the main tank 4 changes from OFF to O.
If it has not changed to N, the process proceeds to step S30,
It is determined whether the detection signal of the main tank sensor SE3 has changed from ON to OFF. If the determination in step S30 is "YES", that is, if the detection signal of the main tank sensor SE3 changes from ON to OFF, this means that the rainwater in the main tank 4 has been used and the water level has dropped. As shown, the "SE3 OFF valve drive" routine of step S31 is executed. In this "SE3 / OFF valve drive" routine, as shown in FIG. 13, the states of the three-way valve V1 and the solenoid valve V2 are maintained as they are (step S
310, 311), this routine ends. If the determination in step S30 is "NO", that is, if the detection signal of the main tank sensor SE3 has not changed from ON to OFF, this routine is ended.

As described above, according to the rainwater storage device 1 of the present embodiment, when the rainfall stops (when step S22 is YES), steps S230 and S2 are performed.
As shown at 31, the inside of the auxiliary tank 3 is always kept empty. Then, when rainfall occurs (YES in step S20) and a predetermined amount of rainwater is stored in the auxiliary tank 3 (when YES in step S24), step S2
50, S251, the flow path of the water supply pipe 5 is set to the main tank 4 side, and the rainwater in the auxiliary tank 3 is drained. As a result, even if the amount of rainfall per one time is small and the rainfalls occur several times over time, the auxiliary tank 3 is always kept empty each time the rainfall stops. A certain amount of rainwater will not be stored in the auxiliary tank 3 due to heavy rainfall, and a certain amount of rainwater will be stored in the auxiliary tank 3 only when it continuously rains from the beginning. Rainwater is stored in the main tank 4 side. Therefore, unlike the conventional rainwater storage device, dirty initial rainfall is not stored in the main tank 4, so that the main tank 4
The water quality of the rainwater stored therein can be improved more than before, and the amount of dust and dirt accumulated in the main tank 4 is reduced as compared with the conventional case, so that maintenance of the main tank 4 is facilitated.

Furthermore, when a predetermined amount of rainwater is stored in the main tank 4 (when step S28 is YES), the flow path of the water supply pipe 5 is switched to the auxiliary tank 3 side (step S).
290), there is no need to provide an overflow port in the main tank 4. As a result, unlike the conventional method, insects and the like do not enter through the overflow port, so that the quality of rainwater stored in the main tank 4 can be maintained more than before, so that dust and dirt accumulate in the main tank 4. Is less than in the conventional case, and the maintenance of the main tank 4 becomes easy.

When the rain stops (step S22)
Is YES) or when a predetermined amount of rainwater is stored in the auxiliary tank 3 (YES in step S24), the solenoid valve V2 is opened (steps S231 and S251), and the water in the auxiliary tank 3 is automatically stored. Since it is drained in a manual manner, it is not necessary to manually drain the auxiliary tank 3 as in the conventional case, and it does not take time and effort. Furthermore, when the power is cut off, the three-way valve V1
The flow path of the water supply pipe 5 is on the side of the auxiliary tank 3, and the solenoid valve V2 is
Since the drain pipe 7 of the auxiliary tank 3 is opened, for example, it malfunctions at the time of a power failure and dirty rainwater is stored in the main tank 4, or the main tank 4, the auxiliary tank 3 and the water supply pipe 5 become full of water. Since rainwater does not overflow from the gutter 2, it is possible to provide a fail-safe configuration that does not burden the rainwater storage device 1.

In the above embodiment, the three-way valve V1 and the solenoid valve V2 are controlled by turning on / off the sensor outputs of the sensors SE1, SE2, SE3. Depending on the amount of rainfall and the amount of water stored in the auxiliary tank 3 and the main tank 4,
A sensor whose output changes linearly may be used to control the three-way valve V1 and the solenoid valve V2 by the sensor output.

[0034]

As described above, according to the rainwater storage device of the present invention, the rainwater stored in the auxiliary tank can be automatically drained without the need for manpower. Will be easier. Also, when the flow path of the water supply pipe is switched from the auxiliary tank side to the main tank side, initial rainfall with poor water quality will not flow into the main tank side, and rainwater with relatively good water quality will be stored in the main tank. It can be reliably stored and the main tank can be easily maintained. Furthermore, since the overflow port of the main tank is not required, insects and dust will not enter the main tank, the water quality can be maintained, and the main tank can be easily maintained.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a rainwater storage device according to an embodiment of the present invention.

FIG. 2 is a schematic view showing the operation of the rainwater storage device.

FIG. 3 is a schematic view showing the operation of the rainwater storage device.

FIG. 4 is a block diagram showing a configuration of a controller of the rainwater storage device.

FIG. 5 is a flowchart showing a main program relating to the operation of the control device.

FIG. 6 is a flowchart showing an “interrupt processing” routine of the control device.

FIG. 7 is a flowchart showing a “valve drive” routine of the control device.

FIG. 8 is a flowchart showing a “SE1 ON valve drive” routine of the control device.

FIG. 9 is a flowchart showing a “SE1 OFF valve driving” routine of the control device.

FIG. 10 is a flowchart showing a “SE2 ON valve drive” routine of the control device.

FIG. 11 is a flowchart showing a “SE2 • OFF valve drive” routine of the control device.

FIG. 12 is a flowchart showing a “SE3 ON valve drive” routine of the control device.

FIG. 13 is a flowchart showing a “SE3 / OFF valve drive” routine of the control device.

FIG. 14 is a schematic diagram showing a configuration of a conventional rainwater storage device.

[Explanation of symbols]

1 Rainwater storage device 2 water catchment 3 auxiliary tanks 4 main tanks 5,5a, 5b Water pipe 6 control device 7 drainage pipe SE1 rainfall sensor SE2 auxiliary tank sensor SE3 Main tank sensor V1 automatic switching valve V2 automatic drain valve

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E03B 3/03 E03B 3/02

Claims (2)

(57) [Claims] 1. A water collecting section for collecting rainwater, a water pipe connected to the water collecting section for flowing down the collected rainwater, and a rainwater flowing down the water pipe connected to the water pipe respectively. A main tank and an auxiliary tank that store the water, and an automatic switching valve that is provided in the water supply pipe and that switches the flow path of the water supply pipe to one of the auxiliary tank side and the main tank side; and the auxiliary tank provided in the auxiliary tank. An auxiliary tank sensor for detecting whether or not the amount of water stored in the tank is a predetermined amount or more, a drain pipe provided at the lower end of the auxiliary tank for draining rainwater in the auxiliary tank, and the drain pipe. An automatic drain valve for opening and closing the drain pipe, a rainfall sensor for detecting the presence or absence of rainfall, and a detection signal from the auxiliary tank sensor are driven to drive the automatic switching valve. Auxiliary When the amount of water stored in the tank is less than a predetermined amount, the flow path of the water pipe is held on the side of the auxiliary tank, and when the amount of water stored in the auxiliary tank reaches a predetermined amount, the flow path of the water pipe is While switching to the main tank side, when the amount of water stored in the auxiliary tank reaches a predetermined amount, the drain pipe is opened by driving the automatic drain valve to open , and in response to the detection signal from the rainfall sensor, during rain. Is the
Close the drain pipe by driving the dynamic drain valve to
When there is no rain, open the automatic drain valve to drive it.
Ri rainwater storage apparatus characterized by comprising a control device for opening the drain pipe. 2. The main tank provided in the main tank,
For detecting whether or not the amount of stored water in the
A main tank sensor is further provided, and the control device receives the detection signal from the main tank sensor.
Accordingly, when the amount of water stored in the main tank reaches a predetermined amount
Is the flow path of the water pipe by driving the automatic switching valve.
Is switched to the auxiliary tank side and the automatic drainage is performed.
The drain pipe is opened by driving the valve to open.
The rainwater storage device according to claim 1.