JP6916992B2 - Flush toilet - Google Patents

Description

The present invention relates to a flush toilet, and more particularly to a flush toilet that cleans the toilet with washing water supplied from a washing water source and discharges filth.

In recent years, the importance of effective use of water resources has increased, for example, in consideration of how to deal with droughts. On the other hand, clean water is mostly used as the washing water used for flush toilets. It can also be said that drinking water is used to transport filth.

It has also been proposed to reduce the use of clean water by using rainwater as part of the wash water used for flush toilets. Specifically, it has been proposed to use a rainwater storage tank that stores rainwater together.

However, if it does not rain or the flush toilet is used frequently, the amount of water in the rainwater storage tank becomes insufficient, and the amount of water required for cleaning the flush toilet and transporting filth cannot be secured. Problems such as poor cleaning of flush toilets will occur.

The configuration disclosed in Patent Document 1 has a water supply tank (tap water tank) and a rainwater tank (medium water tank) side by side in order to eliminate such a problem, and when the amount of water in the rainwater tank is insufficient. It adopts a configuration in which tap water is replenished from the tap water tank to the rainwater tank.

Japanese Unexamined Patent Publication No. 2016-79006

The present inventor enlarges the water supply tank to store not only the amount of water for cleaning but also the amount of water for replenishment when rainwater is insufficient, and when rainwater is insufficient, the water discharge tank for cleaning and rainwater are used. Focusing on the aspect of replenishing wastewater when there is a shortage, we have been diligently studying the degree of enlargement of the required water supply tank.

In the study, the inventor found that the enlargement of the water tank can be suppressed by using the water below the dead water level of the water tank, which cannot be used as washing water, for drainage replenishment. did.

The present invention has been made based on the above background. An object of the present invention is to provide a flush toilet that can effectively utilize rainwater, has a relatively simple structure, and can suppress an increase in the size of a clean water tank.

The present invention includes a toilet bowl having a bowl surface, a drainage pipe connected to the toilet bowl to discharge filth from the toilet bowl, and clean water for storing clean water supplied as wash water on the bowl surface of the toilet bowl. A water-washing toilet bowl including a tank, a rainwater storage tank for storing rainwater to be replenished in the toilet bowl or the drainage pipe, and a detection means for detecting the amount of water in the rainwater storage tank. To supply the clean water stored in the clean water tank to the bowl surface of the toilet bowl as wash water until the water level of the clean water tank reaches the dead water level at the time of washing the toilet bowl. When the amount of water detected by the detection means is equal to or greater than a predetermined amount, the rainwater stored in the rainwater storage tank is replenished to the toilet bowl or the drainage pipe at the time of cleaning the toilet bowl. When the amount of water detected by the detection means is less than a predetermined amount, the clean water below the dead water level stored in the clean water tank is sent to the toilet or the drain pipe at the time of cleaning the toilet. It is a water-washing toilet that is designed to be replenished.

According to the present invention, when the amount of water in the rainwater storage tank is equal to or more than a predetermined amount, the rainwater stored in the rainwater storage tank is replenished to the toilet bowl or the drain pipe when the toilet bowl is washed. As a result, rainwater can be effectively used and water resources can be effectively used. When the amount of water in the rainwater storage tank is less than a predetermined amount, the clean water stored in the clean water tank below the dead water level is replenished to the toilet bowl or the drainage pipe at the time of cleaning the toilet bowl. By adopting such a configuration, it is possible to effectively suppress the occurrence of problems when there is a shortage of rainwater. Then, the clean water until the water level of the clean water tank reaches the dead water level can be used as the washing water of the bowl surface, and the clean water below the dead water level of the clean water tank can be used for replenishment when rainwater is insufficient. Therefore, it is possible to avoid increasing the size of the water supply tank.

Generally, the toilet bowl has a spout where the clean water stored in the clean water tank is supplied onto the bowl surface as wash water. Then, preferably, when the amount of water detected by the detection means is less than a predetermined amount, the flush toilet bowl uses clean water below the dead water level stored in the clean water tank at the time of washing the toilet bowl. , The toilet bowl or the drain pipe is replenished from a position lower than the spout.

By replenishing the water below the dead water level stored in the clean water tank to the toilet bowl or drain pipe from a position lower than the spout, it is possible to effectively use the clean water below the dead water level with low head pressure. can.

Alternatively, when the amount of water detected by the detection means is less than a predetermined amount, the flush toilet uses a pump to pump clean water below the dead water level stored in the clean water tank at the time of washing the toilet. It is preferable that the toilet bowl or the drainage pipe is replenished after being urged.

By energizing the clean water below the dead water level stored in the clean water tank with a pump and then replenishing it to the toilet or drainage pipe, it is possible to effectively use the clean water below the dead water level with low head pressure. can. Specifically, the possibility that the instantaneous flow rate of the clean water to be replenished is insufficient and the waste discharge failure occurs can be remarkably suppressed.

Further, in the flush toilet, when the amount of water detected by the detection means is less than a predetermined amount, the rainwater is used to remove the clean water below the dead water level stored in the clean water tank at the time of washing the toilet. It is preferable that the toilet bowl or the drainage pipe is replenished via the storage tank.

In this case, the rainwater replenishment route from the rainwater storage tank can be shared for replenishment with clean water.

According to the present invention, when the amount of water in the rainwater storage tank is equal to or more than a predetermined amount, the rainwater stored in the rainwater storage tank is replenished to the toilet bowl or the drain pipe when the toilet bowl is washed. As a result, rainwater can be effectively used and water resources can be effectively used. When the amount of water in the rainwater storage tank is less than a predetermined amount, the clean water stored in the clean water tank below the dead water level is replenished to the toilet bowl or the drainage pipe at the time of cleaning the toilet bowl. By adopting such a configuration, it is possible to effectively suppress the occurrence of problems when there is a shortage of rainwater. Then, the clean water until the water level of the clean water tank reaches the dead water level can be used as the washing water of the bowl surface, and the clean water below the dead water level of the clean water tank can be used for replenishment when rainwater is insufficient. Therefore, it is possible to avoid increasing the size of the water supply tank.

It is the schematic sectional drawing of the flush toilet according to 1st Embodiment of this invention. It is a time chart which shows an example of the opening and closing operation of the drain valve and the three-way valve of the flush toilet of FIG. It is the schematic sectional drawing of the flush toilet according to the 2nd Embodiment of this invention. It is a time chart which shows an example of the opening / closing operation of the drain valve and the on-off valve of the flush toilet of FIG.

Next, a flush toilet according to the embodiment of the present invention will be described with reference to the accompanying drawings. In the present embodiment, a flush toilet is illustrated as a flush toilet, but the present invention is also applicable to a flush toilet.

FIG. 1 is a schematic cross-sectional view of a flush toilet according to the first embodiment of the present invention, and FIG. 2 is a time chart showing an example of opening and closing operations of the drain valve and the three-way valve of the flush toilet of FIG. be.

As shown in FIG. 1, the flush toilet 1 of the first embodiment includes a toilet 2 having a flush water supply path 2s, a spout 2a, a bowl surface 2b, and a trap drainage channel 2c, and a trap drainage channel of the toilet bowl 2. It is provided with a drain pipe 3 which is connected to 2c and discharges filth from the toilet bowl 2.

Further, the flush toilet 1 of the first embodiment includes a rainwater storage tank 11 for storing rainwater and a water amount detection sensor 12 for detecting the amount of water in the rainwater storage tank 11. The stormwater storage tank 11 is usually installed outdoors, but may be installed indoors. The water amount detection sensor 12 is, for example, a float sensor that detects the water level in the rainwater storage tank 11, but may be configured by any other water amount detection sensor.

The rainwater storage tank 11 is connected to a rainwater replenishment route 13 that supplies the rainwater stored in the rainwater storage tank 11 to the drainage pipe 3. Specifically, the rainwater replenishment path 13 extends to a three-way valve 14v provided at the upstream end of the drainage urging pump 14 for urging the replenished water. The drainage urging pump 14 is arranged behind the toilet bowl 2 (on the right side in FIG. 1). A common replenishment path 15 extending from the downstream end of the drainage urging pump 14 joins the drainage pipe 3 at the drainage socket 16 provided at the connection portion between the trap drainage channel 2c and the drainage pipe 3. As a result, the rainwater replenishment route 13 replenishes the rainwater stored in the rainwater storage tank 11 to the drainage pipe 3 via the drainage urging pump 14, the common replenishment route 15, and the drainage socket 16.

On the other hand, the flush toilet 1 of the first embodiment is provided with a clean water tank 21 for storing clean water, and the clean water tank 21 is drained from the clean water stored in the clean water tank 21. A clean water replenishment route 23 for replenishing water is connected. The clean water replenishment path 23 also extends to the three-way valve 14v provided at the upstream end of the drainage urging pump 14. As a result, the clean water replenishment route 23 replenishes the clean water to the drainage pipe 3 via the drainage urging pump 14, the common replenishment route 15, and the drainage socket 16.

Further, the clean water tank 21 is supplied with the clean water stored in the clean water tank 21 via the drain valve 21v to the bowl surface 2b via the wash water supply path 2s and the spout 2a of the toilet bowl 2. The clean water supply channel 26 is connected. In this specification, the term "supply" is used for toilet bowl wash water, and the term "replenishment" is used for rainwater or clean water for replenishing stormwater shortage, but this is merely for convenience of explanation. Each specific aspect may be the same.

In the example of FIG. 1, the clean water tank 21, the clean water replenishment path 23, the clean water supply path 26, the drainage urging pump 14, and the common replenishment path 15 are housed in a common housing 30.

At the time of cleaning the toilet bowl 2, the drain valve 21v uses the clean water stored in the clean water tank 21 as wash water on the bowl surface 2b of the toilet bowl 2 until the water level of the clean water tank 21 reaches the dead water level DWL. (For example, 3 L at the time of large washing, 1.6 L at the time of small washing).

As described above, a three-way valve 14v is provided on the upstream side of the drainage urging pump 14 in order to switch the communication state between the rainwater replenishment path 13 and the clean water replenishment path 23 and the common replenishment path 15. The three-way valve 14v is controlled according to the output of the water amount detection sensor 12.

Specifically, as shown in FIG. 2, when the amount of water detected by the water amount detection sensor 12 is equal to or greater than a predetermined amount (when the output is ON), the three-way valve 14v replenishes clean water when cleaning the toilet bowl 2. The route 23 and the common replenishment route 15 are not communicated with each other, but the rainwater replenishment route 13 and the common replenishment route 15 are communicated with each other. In this case, the flush toilet 1 of the first embodiment is adapted to replenish the drainage pipe 3 with the rainwater stored in the rainwater storage tank 11 (for example, 3 L at the time of large washing and 2 L at the time of small washing).

The timing at which the three-way valve 14v is opened with respect to the rainwater replenishment flow path 13 is a timing delayed by Δt after the drain valve 21v is opened. By positively adopting such a delay, the timing of replenishing the water from the common replenishment path 15 to the drainage pipe 3 is set to the drainage timing of the clean water (washing water) supplied onto the bowl surface 2b of the toilet bowl 2. Can be adapted to.

On the other hand, as shown in FIG. 2, when the amount of water detected by the water amount detection sensor 12 is less than a predetermined amount (when the output is OFF), the three-way valve 14v is common to the rainwater replenishment path 13 when cleaning the toilet bowl 2. The replenishment route 15 is not communicated with the clean water replenishment route 23 and the common replenishment route 15 is communicated with each other. In this case, the flush toilet 1 of the first embodiment does not use the rainwater stored in the rainwater storage tank 11, but replenishes the clean water stored in the clean water tank 21 to the drain pipe 3. (For example, 3L for large cleaning, 2L for small cleaning).

As shown in FIG. 2, the timing at which the three-way valve 14v is opened with respect to the clean water replenishment flow path 13 is also the timing delayed by Δt after the drain valve 21v is opened. By positively adopting such a delay, the timing of replenishing the water from the common replenishment path 15 to the drainage pipe 3 is set to the drainage timing of the clean water (washing water) supplied onto the bowl surface 2b of the toilet bowl 2. Can be adapted to.

However, the timing at which the three-way valve 14v is opened with respect to the clean water replenishment flow path 13 may be the timing at which the drain valve 21v is closed. In this case, the clean water until the water level of the clean water tank 21 reaches the dead water level is used as the washing water of the bowl surface 2b, and the clean water below the dead water level of the clean water tank 21 is used when the rainwater is insufficient. It can be used for replenishing wastewater, and it is possible to avoid increasing the size of the water supply tank 21.

According to the present embodiment as described above, when the amount of water in the rainwater storage tank 11 is equal to or more than a predetermined amount, the rainwater stored in the rainwater storage tank 11 is replenished to the drain pipe 3 when the toilet bowl 2 is washed. .. As a result, rainwater can be effectively used and water resources can be effectively used.

According to the present embodiment, when the amount of water in the rainwater storage tank 11 is less than a predetermined amount, the rainwater stored in the rainwater storage tank 11 is not used when the toilet bowl 2 is washed, and the clean water replenishment route 23 is used. The clean water stored in the clean water tank 21 is replenished to the drain pipe 3 (without passing through the rainwater storage tank 11). As a result, it is possible to effectively suppress the occurrence of problems when there is a shortage of rainwater, but since it is not necessary to move water between the two tanks, the structure is not complicated and the structure becomes large. Nor. Further, it is easy to arrange the rainwater storage tank 11 at a position away from the toilet bowl 2.

In particular, according to the present embodiment, the clean water until the water level of the clean water tank 21 reaches the dead water level is used as the washing water of the bowl surface 2b, and the clean water below the dead water level of the clean water tank 21 is used. It is possible to select the mode used for replenishing wastewater when there is a shortage of rainwater. In this case, it is possible to avoid increasing the size of the clean water tank 21.

Further, according to the present embodiment, the clean water is replenished from the three-way valve 14v located at a position lower than the spout 2a of the toilet bowl 2, and the clean water is replenished by being urged by the drainage urging pump 14. Therefore, clean water below the dead water level, which has a low head pressure, can be effectively used. Specifically, the possibility that the instantaneous flow rate of the clean water to be replenished is insufficient and the waste discharge failure occurs can be remarkably suppressed.

In the cleaning type toilet bowl 1 of the first embodiment, the common replenishment path 15 after merging at the three-way valve 14v is connected to the drainage pipe 3 at the drainage socket 16. Instead of or in addition to this, the common replenishment route after the rainwater replenishment route 13 and the clean water replenishment route 23 are merged by the three-way valve in substantially the same manner is the flush water supply route 2a of the toilet bowl 2, the toilet bowl. It may be connected to the bowl surface 2b of 2 and / or the trap drainage channel 2c of the toilet bowl 2.

Alternatively, the rainwater replenishment path 13 and the clean water replenishment path 23 are not merged by the three-way valve, but are located at different positions (for example, via an on-off valve that is controlled to open and close according to the output of the water amount detection sensor 12, etc.). The drainage pipe 3 (for example, the drainage socket 16), the wash water supply path 2a of the toilet bowl 2, the bowl surface 2b of the toilet bowl 2, the trap drainage channel 2c of the toilet bowl 2, etc. may be arranged so as to replenish the drainage.

Further, in the cleaning type toilet bowl 1 of the first embodiment described above, replenishment with clean water is performed without passing through the rainwater storage tank 11, but replenishment with clean water is performed via the rainwater storage tank 11. It may be done. The flush toilet 101 of the second embodiment is shown in FIG.

As shown in FIG. 3, in the flush toilet 101 of the second embodiment, the clean water replenishment path 123 for supplying clean water to the drainage pipe 3 is controlled to open and close according to the output of the water amount detection sensor 12 and the like. It is connected to the rainwater storage tank 11 via the first on-off valve 123v.

Further, on the upstream side of the drainage urging pump 14, instead of the three-way valve 14v, a second on-off valve 113v whose opening and closing is controlled according to the output of the water amount detection sensor 12 and the like is provided.

In the flush toilet 101 of the second embodiment, other configurations are substantially the same as those of the flush toilet 1 of the first embodiment described with reference to FIG. In FIG. 3, the same components as those of the flush toilet bowl 1 of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 4 is a time chart showing an example of the opening / closing operation of the drain valve and the on-off valve of the flush toilet of FIG. As shown in FIG. 4, when the amount of water detected by the water amount detection sensor 12 is equal to or greater than a predetermined amount (when the output is ON), the first on-off valve 123v is not opened and the second on-off valve 123v is not opened when the toilet bowl 2 is washed. The valve 113v communicates the rainwater replenishment path 13 with the common replenishment path 15. In this case, the flush toilet 101 of the second embodiment is adapted to replenish the drainage pipe 3 with the rainwater stored in the rainwater storage tank 11 (for example, 3 L at the time of large washing and 2 L at the time of small washing).

The timing at which the second on-off valve 113v is opened is a timing delayed by Δt after the drain valve 21v is opened. By positively adopting such a delay, the timing of replenishing the water from the common replenishment path 15 to the drainage pipe 3 is set to the drainage timing of the clean water (washing water) supplied onto the bowl surface 2b of the toilet bowl 2. Can be adapted to.

On the other hand, as shown in FIG. 4, when the amount of water detected by the water amount detection sensor 12 is less than a predetermined amount (when the output is OFF), the first on-off valve 123v and the second on-off valve 113v are used when cleaning the toilet bowl 2. And are released. In this case, the flush toilet 101 of the second embodiment is adapted to replenish the drainage pipe 3 with the clean water stored in the clean water tank 21 via the rainwater storage tank 11 (for example, large). 3L for cleaning, 2L for small cleaning).

As shown in FIG. 4, the timing at which the first on-off valve 123v and the second on-off valve 113v are opened is also a timing delayed by Δt after the drain valve 21v is opened. By positively adopting such a delay, the timing of replenishing the water from the common replenishment path 15 to the drainage pipe 3 is set to the drainage timing of the clean water (washing water) supplied onto the bowl surface 2b of the toilet bowl 2. Can be adapted to.

However, the timing at which the first on-off valve 123v and the second on-off valve 113v are opened may be the timing at which the drain valve 21v is closed. In this case, the clean water until the water level of the clean water tank 21 reaches the dead water level is used as the washing water of the bowl surface 2b, and the clean water below the dead water level of the clean water tank 21 is used when the rainwater is insufficient. It can be used for replenishing wastewater, and it is possible to avoid increasing the size of the water supply tank 21.

Even with the flush toilet 101 of the second embodiment as described above, when the amount of water in the rainwater storage tank 11 is equal to or more than a predetermined amount, the rainwater stored in the rainwater storage tank 11 is drained when the toilet bowl 2 is washed. The pipe 3 is replenished. As a result, rainwater can be effectively used and water resources can be effectively used.

Then, according to the second embodiment, when the amount of water in the rainwater storage tank 11 is less than a predetermined amount, the clean water stored in the clean water tank 21 passes through the rainwater storage tank 11 at the time of cleaning the toilet bowl 2. Is replenished to the drainage pipe 3. As a result, it is possible to effectively suppress the occurrence of problems when there is a shortage of rainwater. Further, for replenishment with clean water, the rainwater replenishment route 13 from the rainwater storage tank 11 can be shared.

Further, also in the second embodiment, the clean water until the water level of the clean water tank 21 reaches the dead water level is used as the washing water of the bowl surface 2b, and the clean water below the dead water level of the clean water tank 21 is used. It is possible to select the mode used for replenishing wastewater when there is a shortage of rainwater. In this case, it is possible to avoid increasing the size of the clean water tank 21.

Further, also in this embodiment, since the clean water is replenished by being urged by the drainage urging pump 14, it is possible to effectively use the clean water below the dead water level having a low head pressure. Specifically, the possibility that the instantaneous flow rate of the clean water to be replenished is insufficient and the waste discharge failure occurs can be remarkably suppressed.

1 Flush toilet 2 Toilet bowl 2s Washing water supply path 2a Spout 2b Bowl surface 2c Trap drainage channel 3 Drainage pipe 11 Rainwater storage tank 12 Water volume detection sensor 13 Rainwater replenishment route 14 Drainage urging pump 14v Three-way valve 15 Common replenishment route 16 Drain socket 21 Clean water tank 21v Drain valve 23 Clean water replenishment path 26 Clean water supply path 30 Housing 101 Flush toilet 113v 2nd on-off valve 123 Clean water replenishment path 123v 1st on-off valve

Claims (4)

Toilet bowl with bowl surface and
A drainage pipe that is connected to the toilet bowl and discharges filth from the toilet bowl,
A clean water tank for storing clean water supplied as wash water on the bowl surface of the toilet bowl, and a clean water tank.
A rainwater storage tank for storing rainwater to be replenished in the toilet bowl or the drainage pipe, and
A detection means for detecting the amount of water in the rainwater storage tank and
It is a flush toilet equipped with
The flush toilet is
At the time of washing the toilet bowl, the clean water stored in the clean water tank is supplied as washing water onto the bowl surface of the toilet bowl until the water level of the clean water tank reaches the dead water level. And
When the amount of water detected by the detection means is equal to or greater than a predetermined amount, the rainwater stored in the rainwater storage tank is replenished to the toilet bowl or the drainage pipe at the time of cleaning the toilet bowl.
When the amount of water detected by the detection means is less than a predetermined amount, the toilet bowl or the drain pipe is replenished with clean water below the dead water level stored in the clean water tank at the time of cleaning the toilet bowl. A flush toilet that is characterized by being The toilet bowl has a spout where the clean water stored in the clean water tank is supplied onto the bowl surface as wash water.
The flush toilet is
When the amount of water detected by the detection means is less than a predetermined amount, when the toilet bowl is washed, the clean water stored in the clean water tank below the dead water level is discharged from a position lower than the spout. Alternatively, the flush toilet according to claim 1, wherein the drainage pipe is replenished. The flush toilet is
When the amount of water detected by the detection means is less than a predetermined amount, the toilet bowl or the toilet bowl or the toilet bowl or The flush toilet according to claim 1 or 2, wherein the drainage pipe is replenished. The flush toilet is
When the amount of water detected by the detection means is less than a predetermined amount, at the time of cleaning the toilet bowl, the clean water below the dead water level stored in the clean water tank is supplied to the toilet bowl or the toilet bowl via the rainwater storage tank. The flush toilet according to any one of claims 1 to 3, wherein the drainage pipe is replenished.

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