JP4941889B2 - Flush toilet - Google Patents

Description

  The present invention relates to a flush toilet, and more particularly to a flush toilet that is washed with pressurized flush water.

  Japanese Patent No. 3542622 (Patent Document 1) describes a pump-operated sanitary instrument and toilet equipment. This flush toilet (sanitary instrument) includes a tank for storing wash water disposed at a position lower than the upper end surface of the bowl part at the rear of the bowl part, and a pump for pressurizing the wash water in the tank. Yes. This pump is operated at the time of cleaning the toilet bowl, and is configured to pressurize the wash water in the tank and discharge the water into the bowl to wash the toilet bowl. That is, in this flush toilet, since the wash water is pressurized by the pump and discharged into the bowl portion, the water head pressure for discharging the wash water is not required, and the tank can be disposed at a low position. . As a result, a flush toilet with a low overall height is realized while having a tank. Further, in this flush toilet, the overflow water from the tank is configured to flow into the bowl portion through an overflow water passage communicating with an opening formed in the wall surface of the bowl portion.

Japanese Patent No. 3542622

  However, in the flush toilet described in Japanese Patent No. 3542622, the overflow water channel communicates with the opening formed in the wall surface of the bowl portion, so that if the water level in the bowl portion rises for some reason, There is a problem that water may flow back into the tank through the overflow channel. Further, if the tank is disposed above the upper end surface of the bowl portion, although there is no risk of backflow, a flush toilet having a low overall height and a clean appearance cannot be formed.

  Therefore, in order to prevent backflow of the wash water in the bowl portion into the tank while keeping the overall height of the flush toilet low, a tank is disposed below the upper end surface of the bowl portion, and the overflow channel is the upper end surface of the bowl portion. It is conceivable to constitute the bowl part so as to extend beyond the above. However, if the overflow channel is formed so as to exceed the upper end surface of the bowl part, not only the appearance of the flush toilet is deteriorated, but also there is a problem that the outlet to the bowl part becomes dirty and unsanitary.

  Accordingly, an object of the present invention is to provide a flush toilet capable of overflowing wash water into the bowl portion while preventing backflow of the wash water in the bowl portion into the water storage tank.

  In order to solve the above-described problems, the present invention is a flush toilet flushed by pressurized flush water, a bowl portion in which a jet spout is formed, and a drain trap pipe extending from the bottom of the bowl portion. A flush toilet body provided with a passage, a pressure pump for pressurizing wash water for washing the bowl portion, a jet-side water supply passage for guiding the wash water pressurized by the pressurization pump to a jet spout, and the jet A jet breaker vacuum breaker provided in the middle of the side water supply channel, a water storage tank for storing cleaning water to be pressurized by a pressurizing pump, and when the water level of the cleaning water in the water storage tank rises above a predetermined level And a release water channel that causes the wash water overflowing from the water storage tank to flow down to the atmosphere opening portion of the jet water spouting vacuum breaker.

  In the present invention configured as described above, when the bowl portion is washed, the washing water in the water storage tank is pressurized by the pressure pump and discharged from the jet water outlet through the jet side water supply passage. A jet water breaker vacuum breaker is provided in the middle of the jet-side water supply channel. Further, the flush toilet of the present invention has a release water channel, and this release water channel jets the cleaning water when the water level of the cleaning water rises above a predetermined water level and the cleaning water overflows from the water storage tank. Flow down to the open part of the vacuum breaker. The overflow water that has flowed down to the atmosphere opening portion flows into the bowl portion through the jet-side water supply passage and the jet spout, and is discharged from the drain trap conduit.

  According to the present invention configured as described above, the wash water overflowed from the water storage tank is caused to flow down to the atmosphere opening portion of the jet water spouting vacuum breaker and discharged, so that the wash water in the bowl portion is supplied to the water storage tank. Backflow can be prevented.

  Further, the present invention is a flush toilet flushed with pressurized wash water, comprising a bowl portion in which a jet spout and a rim spout are formed, and a drain trap pipe extending from the bottom of the bowl portion. The flush toilet body, the rim-side water supply channel that guides the wash water to the rim spout, the pressurizing pump that pressurizes the wash water for cleaning the bowl and discharges the water from the jet spout, and pressurizes the pressurization pump. When the water level of the cleaning water in the storage tank rises above a predetermined water level higher than the upper end surface of the bowl portion, the cleaning water overflowed from the water storage tank is removed from the rim side water supply channel. And a release water channel that flows into the water.

  In the present invention configured as described above, when the bowl portion is washed, the washing water in the water storage tank is pressurized by the pressure pump and discharged from the jet water outlet through the jet side water supply passage. Further, when the bowl portion is washed, washing water is also discharged from the rim spout. Furthermore, the flush toilet of the present invention has a release water channel, and the water level of the wash water rises above a predetermined water level higher than the upper end surface of the bowl portion, and the wash water overflows from the water storage tank. In this case, the cleaning water is allowed to flow into the rim side water supply channel. The overflow water that has flowed into the rim-side water supply channel flows into the bowl portion through the rim-side water supply channel and the rim water discharge port, and is discharged from the drain trap pipe.

  According to the present invention configured as described above, since the wash water overflowed from the water storage tank is caused to flow into and discharge from the rim-side water supply channel, backflow of the wash water in the bowl portion to the water storage tank is prevented. Can do.

  Further, the present invention is a flush toilet flushed with pressurized washing water, which is formed in a bowl portion in which a water discharge port is formed, and on the rear upper end surface of the bowl portion, and allows overflow water to flow into the bowl portion. A flush toilet body provided with a drainage groove and a drain trap pipe extending from the bottom of the bowl, a pressurizing pump for pressurizing flushing water that is spouted from the spout and cleans the bowl, and this pressurizing pump When the water level in the storage tank rises above a predetermined water level higher than the upper end surface of the bowl, the water overflowing from the water storage tank is discharged into the drainage channel. And a release water channel that flows down.

  In this invention comprised in this way, when wash | cleaning a bowl part, the wash water of a water storage tank is pressurized with a pressurization pump, and is discharged from a spout. A drainage groove for allowing overflow water to flow into the bowl portion is formed on the rear upper end surface of the bowl portion of the flush toilet body. Further, the flush toilet of the present invention is provided with a release water channel, and this release water channel is removed from the water storage tank when the water level of the cleaning water in the water storage tank rises above a predetermined water level higher than the upper end surface of the bowl part. The overflowed washing water is allowed to flow down to the drainage channel. The overflow water flowing down to the drainage groove flows into the bowl portion and is discharged from the drain trap pipe.

  According to the present invention configured as described above, the wash water overflowed from the water storage tank flows down to the drain groove formed on the upper end surface of the bowl portion and is discharged, so the water storage tank for the wash water in the bowl portion is discharged. Backflow into the can be prevented.

In this invention, Preferably, a drainage groove is a groove | channel extended in the front-back direction of the flush toilet body in the center of the rear part of a bowl part.
According to the present invention thus configured, the drainage groove can be provided without impairing the appearance of the flush toilet. Furthermore, since the drainage groove is formed at a position where there is little possibility of entry of filth, it does not become unsanitary.

In the present invention, preferably, the water storage tank is disposed on the side of the drainage groove and the drainage trap pipe, and the release waterway is a wide waterway communicating with the side surface of the drainage groove.
According to the present invention configured as described above, since the release water channel communicating with the side surface of the drainage groove is configured to be wide, it is possible to secure a sufficient flow channel area while keeping the height of the release water channel low. .

  According to the flush toilet of the present invention, it is possible to provide a flush toilet capable of overflowing wash water into the bowl portion while preventing backflow of the wash water in the bowl portion to the water storage tank.

Next, a flush toilet according to an embodiment of the present invention will be described with reference to the accompanying drawings.
First, with reference to FIG. 1 thru | or FIG. 11, the flush toilet by 1st Embodiment of this invention is demonstrated. FIG. 1 is a right side view of a flush toilet according to the present embodiment. FIG. 2 is a top view of a flush toilet according to the present embodiment, and FIG. 3 is a left side view. FIG. 4 is a perspective view of the flush toilet according to the present embodiment as seen from the upper right rear side, and FIG. 5 is a perspective view seen from the upper left rear side. 6 is a cross-sectional view taken along the line VI-VI in FIG. FIG. 7 is a block diagram showing a water supply system for rim water discharge and jet water discharge. 2 to 6 show the flush toilet according to the present embodiment with the toilet seat, the cover, the local cleaning device, and the side panel removed.

  As shown in FIG. 1, the flush toilet 1 according to the first embodiment of the present invention is arranged so as to cover the flush toilet body 2, the toilet seat 4 disposed on the upper surface of the flush toilet body 2, and the toilet seat 4. And a local cleaning device 8 disposed in the upper rear part of the flush toilet main body 2. Moreover, the function part 10 is arrange | positioned at the back of the flush toilet main body 2, and this function part 10 is covered with the side panel 10a.

  The flush toilet main body 2 is made of earthenware, and includes a bowl portion 12 for receiving filth, a drain trap pipe 14 extending from the bottom of the bowl portion 12, a jet spout 16 for jet water discharge, and a rim spout for rim water discharge. A water port 18 is formed. The drain trap pipe 14 extends rearward and obliquely upward from the bottom of the bowl portion 12, and then extends downward to be connected to the drain pipe D. The jet spout 16 is formed at the bottom of the bowl portion 12 and is configured to discharge cleaning water toward the inlet of the drain trap conduit 14. The rim water spouting port 18 is formed at the upper left rear of the bowl portion 12 and is configured to discharge cleaning water along the edge of the bowl portion 12.

  The flush toilet 1 according to the first embodiment of the present invention is directly connected to a water supply that supplies cleaning water, and the cleaning water is discharged from the rim spout 18 by the water supply pressure of the water supply. In addition, the jet water spouting is configured such that the washing water stored in the water storage tank built in the function unit 10 is pressurized by a pressure pump and discharged from the jet water spouting port 16 at a large flow rate.

Next, the configuration of the functional unit 10 will be described with reference to FIGS.
As shown in FIGS. 2 to 7, the function unit 10 includes a constant flow valve 20, a rim water discharge electromagnetic valve 22, a rim water discharge vacuum breaker 24, and a rim water discharge flapper as a water supply system for rim water discharge. A valve 26 is incorporated. Further, the functional unit 10 includes a tank water supply electromagnetic valve 28, a tank water supply vacuum breaker 30, a water storage tank 32, a pressurizing pump 34, and a jet water discharge vacuum breaker 36 as a water supply system for jet water discharge. A jet water spouting flapper valve 38 is incorporated. Furthermore, the function unit 10 incorporates a controller 40 (FIG. 7) that is a cleaning control means for controlling the rim water discharge electromagnetic valve 22, the tank water supply electromagnetic valve 28, and the pressurizing pump 34.

  The constant flow valve 20 is configured to restrict the wash water flowing from the water inlet 20a through the stop cock 42a, the branch fitting 42b, and the strainer 42c (shown in FIG. 7) to a predetermined flow rate or less. Yes. In the present embodiment, the constant flow valve 20 is configured to limit the flow rate of the cleaning water to 16 liters / minute or less. The washing water that has passed through the constant flow valve 20 is branched into two, one connected to the rim water discharge electromagnetic valve 22 and the other connected to the tank water supply electromagnetic valve 28. In the present embodiment, the constant flow valve 20 is disposed on the left rear side of the flush toilet body 2.

  The electromagnetic valve 22 for rim water discharge is opened and closed by a control signal from the controller 40, and is configured to discharge and stop washing water from the rim water discharge port 18. In the present embodiment, the rim water spouting electromagnetic valve 22 is arranged on the rear left side of the flush toilet main body 2 in the same manner as the constant flow valve 20.

  The rim water discharge vacuum breaker 24 is disposed in the middle of the rim-side water supply path 18 a that guides the wash water that has passed through the rim water discharge electromagnetic valve 22 to the rim water discharge port 18, and prevents backflow of the wash water from the rim water discharge port 18. ing. Further, the rim water discharge vacuum breaker 24 is disposed about 25.4 mm (about 1 inch) above the upper end surface of the bowl portion 12 and reliably prevents backflow. In the present embodiment, the rim water spouting vacuum breaker 24 is disposed above the drain trap pipe 14 at the rear center of the flush toilet body 2.

  The rim water spouting flapper valve 26 is disposed in the rim-side water supply passage 18 a downstream of the rim water spouting vacuum breaker 24, and prevents backflow from the rim water spouting port 18 of the cleaning water. In the present embodiment, the rim water discharge vacuum breaker 24 and the rim water discharge flapper valve 26 are arranged in series in the rim side water supply path 18a, thereby preventing the backflow of the washing water more reliably. In the present embodiment, the rim water spouting flapper valve 26 is disposed above the jet water spouting flapper valve 38 on the rear left side of the flush toilet body 2.

  The tank water supply solenoid valve 28 is configured to be opened and closed by a control signal from the controller 40 to supply and stop the wash water to the water storage tank 32. In the present embodiment, the tank water supply electromagnetic valve 28 is arranged on the rear left side of the flush toilet main body 2, similarly to the constant flow valve 20.

  The tank water supply vacuum breaker 30 is disposed in the middle of the tank water supply path 32 a that guides the wash water that has passed through the tank water supply electromagnetic valve 28 to the water storage tank 32, and prevents backflow from the water storage tank 32 of the wash water. Further, the tank water supply vacuum breaker 30 is disposed about 25.4 mm (about 1 inch) above the overflow edge of the water storage tank 32, and reliably prevents backflow. In the present embodiment, the tank water supply vacuum breaker 30 is disposed above the drain trap pipe 14 at the rear center of the flush toilet body 2.

  The water storage tank 32 is configured to store cleaning water to be discharged from the jet water discharge port 16. In the present embodiment, as shown in FIG. 6, the water storage tank 32 is disposed so as to extend from the rear right side of the flush toilet main body 2 to the upper part of the drain trap pipe 14 at the center of the rear of the flush toilet main body 2. And has an internal volume of about 3 liters. A resin mounting frame 2a, which is a mounting portion, is fixed to the rear of the flush toilet main body 2. The mounting frame 2a is configured separately from the flush toilet main body 2, and includes a water storage tank 32. It is formed in a substantially rectangular shape so as to surround the periphery of. The water storage tank 32 is suspended from the mounting frame 2a by engaging the flange portion at the upper end with the mounting frame 2a.

  Furthermore, in this embodiment, the front end of the tank water supply channel 32a is opened near the bottom of the water storage tank 32, and water is supplied to the water storage tank 32 with the front end of the tank water supply channel 32a submerged. The noise at the time is reduced. In addition, a float switch 32b is disposed inside the water storage tank 32, and is configured to detect the water level in the water storage tank 32. The float switch 32b is turned on when the water level in the water storage tank 32 reaches a predetermined water storage water level, and the controller 40 is configured to detect this and close the tank water supply electromagnetic valve 28.

  In addition, a release water channel 32d is provided at the upper part of the side surface of the water storage tank 32 to allow the wash water to overflow when the water level in the water storage tank 32 rises abnormally. As shown in FIGS. 5 and 6, the release water channel 32 d is a tube having a substantially square cross section extending laterally from the side surface of the water storage tank 32, and the tip extends to the atmosphere opening portion of the jet water spouting vacuum breaker 36. . For this reason, when the water level in the water storage tank 32 becomes higher than the bottom surface of the release water channel 32d which is an overflow edge, the wash water in the water storage tank 32 flows out through the release water channel 32d, and the jet water spouting vacuum breaker 36 is opened to the atmosphere. Flow into the department. As a result, the cleaning water in the water storage tank 32 is prevented from overflowing the floor surface and the functional unit 10 being damaged by the overflowing cleaning water. In the present embodiment, the bottom surface of the release water channel 32d is positioned approximately 35 mm above the upper end surface of the bowl portion 12.

  The pressurizing pump 34 is configured to pressurize the wash water stored in the water storage tank 32 and discharge the pressurized water from the jet water outlet 16. In the present embodiment, the pressurizing pump 34 is disposed below the water storage tank 32, that is, on the right rear side of the flush toilet body 2 and on the side of the drain trap pipe 14. As shown in FIG. 4, two U-shaped metal plates 32c extending downward are attached to the bottom surface of the water storage tank 32, and the pressurizing pump 34 is connected to the water storage tank 32 by the metal plates 32c. It is hung downward.

  The pressurizing pump 34 includes an impeller 34a that pressurizes the cleaning water and a motor 34b (FIG. 7) that drives the impeller 34a. Furthermore, a drain faucet 34c (FIG. 7) is connected to the pressurizing pump 34. By opening the drain faucet 34c, the inside of the water storage tank 32 and the pressurizing pump 34 can be used during maintenance. The washing water can be discharged. A water receiving tray 2b is disposed below the pressurizing pump 34, and is configured to receive condensed water droplets and water leakage.

  Further, as shown in FIG. 4, the water storage tank 32 extends from the water storage tank 32 toward the front of the flush toilet main body 2 and then U-turns and pressurizes the pressure pump 34 via a U-shaped pipe 34d toward the rear. It is connected to the. Further, the wash water pressurized by the pressurization pump 34 flows into the jet water spouting vacuum breaker 36 through the transverse pipe 34e extending across the flush toilet body 2 at the rear side of the drain trap pipe 14. It is configured as follows. In the present embodiment, the pressurizing pump 34 is configured to pressurize the cleaning water in the water storage tank 32 and discharge the cleaning water from the jet water outlet 16 at a maximum flow rate of about 100 liters / minute. Yes.

  The jet water spouting vacuum breaker 36 is connected to the downstream side of the pressurizing pump 34 to prevent the water stored in the bowl portion 12 from flowing back to the water storage tank 32 side, and to perform edge cutting between them. It is configured. Thereby, the stored water level in the water storage tank 32 can be set higher than the stored water level in the bowl portion 12. Further, the wash water flowing out from the release water channel 32 d of the water storage tank 32 flows into the atmosphere opening portion of the jet water spouting vacuum breaker 36. The washing water that has flowed into the atmosphere opening portion is configured to flow into the bowl portion 12 from the jet water discharge port 16 through the jet water discharge flapper valve 38 and the jet side water supply passage 16a. In the present embodiment, the jet water spouting vacuum breaker 36 is disposed on the left side of the drain trap line 14 behind the flush toilet body 2.

  The jet water spouting flapper valve 38 is connected to the downstream side of the jet water spouting vacuum breaker 36 to prevent a backflow from the jet water spout 16 of the cleaning water. In this embodiment, the jet water spouting vacuum breaker 36 and the jet water spouting flapper valve 38 are arranged in series to prevent the backflow of cleaning water more reliably. The cleaning water that has passed through the jet water spouting flapper valve 38 is configured to be discharged from the jet water spouting port 16 through the jet side water supply passage 16a. In the present embodiment, the jet water spouting flapper valve 38 is disposed on the left side of the drain trap pipe 14 behind the flush toilet body 2. That is, the wash water stored in the water storage tank 32 arranged on the right side of the drain trap pipe 14 and pressurized by the pressurizing pump 34 passes through the transverse pipe 34e and is opposite to the drain trap pipe 14. The jet water spouting vacuum breaker 36, the jet water spouting flapper valve 38, and the jet side water supply passage 16a are discharged from the jet water spouting port 16 to the left side.

  In the present embodiment, the jet water spouting flapper valve 38 is disposed below the rim water spouting flapper valve 26 on the left rear side of the flush toilet body 2. Accordingly, the rim-side water supply path 18 a extending from the rim water spouting flapper valve 26 and reaching the rim water discharge port 18 is also disposed on the same side as the jet-side water supply path 16 a with respect to the drain trap pipe 14.

  The controller 40, which is a cleaning control means, sequentially operates the rim water spouting electromagnetic valve 22 and the pressurizing pump 34 by the operation of the toilet cleaning switch (not shown) by the user, and from the rim water spouting port 18 and the jet water spouting port 16. The bowl portion 12 is washed by sequentially starting water discharge. Further, after the cleaning is completed, the controller 40 opens the tank water supply solenoid valve 28 to replenish the water storage tank 32 with the cleaning water, and closes the tank water supply solenoid valve 28 when the float switch 32b detects the specified water storage amount. And is configured to stop water supply. Therefore, the tank water supply electromagnetic valve 28 functions as a washing water supply means.

  In addition, the controller 40 has a built-in time measuring means 40a for measuring the time until the float switch 32b detects a predetermined water storage level after the replenishment of the washing water to the water storage tank 32 is started. Furthermore, the controller 40 has a built-in water discharge time adjusting means 40b for adjusting the water discharge time of the wash water from the rim water discharge port 16 based on the time measured by the time measuring means 40a. In addition, the controller 40 performs a freeze prevention operation when there is a risk of freezing in the wash water in the flush toilet 1 and a temperature sensor 40c that is a temperature detection unit that measures the temperature of the room in which the flush toilet 1 is installed. The anti-freezing control means 40d to be executed and a timer 40e for counting the time interval of the anti-freezing operation are provided. Specifically, the controller 40 includes a CPU, a memory, and a program that operates them.

  Next, the configuration of the jet water spouting vacuum breaker 36 will be described with reference to FIG. FIG. 8 is a cross-sectional view of the jet water spouting vacuum breaker 36. As shown in FIG. 8, the jet water spouting vacuum breaker 36 includes a valve body 44 in which a water inlet 44 a and a water outlet 44 b are formed, and a vacuum breaker coma disposed so as to be movable in the vertical direction in the valve body 44. 46 and a vacuum breaker main body 48 attached to the valve main body 44 and formed with an air release portion 48a.

  The water inlet 44a of the valve main body 44 is opened vertically upward, and is connected so as to communicate with the transverse pipe 34e. The water outlet 44b is open in the horizontal direction and is connected to the inlet of the jet water spouting flapper valve 38.

  The vacuum breaker piece 46 has a generally disc-shaped valve body 46a and a shaft 46b extending vertically upward from the center of the valve body 46a. Further, a lower surface sealing material 46c for closing the water inlet 44a is attached to the lower surface of the valve body portion 46a, and an upper surface sealing material 46d for closing the atmosphere opening portion 48a is attached to the upper surface of the valve body portion 46a.

The vacuum breaker body 48 is a substantially cylindrical member, and an air release portion 48 a is formed at the lower end thereof, and the lower portion is fitted into the valve body 44. Further, on the central axis of the vacuum breaker main body 48, a guide portion 48b that slidably receives the shaft portion 46b of the vacuum breaker piece 46 is provided. When the shaft portion 46b is received by the guide portion 48b, the vacuum breaker piece 46 has a lower position where the lower surface sealing material 46c closes the water inlet 44a and an upper position where the upper surface sealing material 46d closes the air opening portion 48a. It is slidably supported between them.
Further, a notch is formed in the upper part of the vacuum breaker body 48, and the tip of the release water channel 32d of the water storage tank 32 is inserted into this notch. As a result, the wash water that has flowed out of the release water channel 32d flows into the vacuum breaker body 48, and flows out to the water outlet 44b through the atmosphere opening portion 48a.

  In use, when washing water flows in from the water inlet 44a, the vacuum breaker piece 46 is moved to the upper position by the water force, and the atmosphere opening portion 48a is closed. Thereby, the wash water flowing in from the water inlet 44a is discharged from the water outlet 44b. Further, when the inflow of washing water from the water inlet 44a is stopped, the vacuum breaker piece 46 is moved to a lower position by gravity, and the water inlet 44a is closed. Thereby, the reverse flow of the washing water from the water outlet 44b to the water inlet 44a is prevented. Further, since the water outlet 44b communicates with the air opening portion 48a, the water inlet 44a and the water outlet 44b are cut off, and the water level of the water storage tank 32 communicated with the water inlet 44a and the water level of the bowl portion 12 communicated with the water outlet 44b are interlocked. No longer. Further, when the cleaning water flows from the release water channel 32d into the atmosphere opening portion 48a, the cleaning water flows out from the water outlet 44b and flows into the bowl portion 12.

  In the present embodiment, the seat surface on which the vacuum breaker piece 46 closes the water inlet 44 a is positioned above the upper end surface of the bowl portion 12. For this reason, even when the water level of the cleaning water in the bowl portion 12 rises, the cleaning water in the bowl portion 12 does not flow backward to the jet water spouting vacuum breaker 36 and overflow from the atmosphere opening portion 48a. However, since the backflow of the washing water from the bowl portion 12 is also blocked by the jet water spouting flapper valve 38, the jet water spouting vacuum breaker 36 is placed in the bowl portion 12 as long as it is above the water level of the bowl portion 12. It can also be arranged at a position lower than the upper end surface of the.

  Here, the structure of the jet water discharge vacuum breaker 36 has been described, but the rim water discharge vacuum breaker 24 and the tank water supply vacuum breaker 30 also have the same structure. Further, the seat surface of the rim water spouting vacuum breaker 24 is disposed about 25.4 mm (about 1 inch) above the upper end surface of the bowl portion 12, and the tank water supply vacuum breaker 30 has a seat surface for storing water. It is disposed about 25.4 mm (about 1 inch) above the bottom surface of the release water channel 32 d extending from the tank 32, and reliably prevents the reverse flow of the cleaning water upstream.

Next, a procedure for removing the water storage tank 32 and the pressure pump 34 during maintenance will be described.
When removing the water storage tank 32 and the pressure pump 34, first, the toilet seat 4, the cover 6, and the local washing device 8 attached on the flush toilet main body 2 are removed, and the upper part of the functional unit 10 is exposed. Next, the side panels 10a attached to both sides of the functional unit 10 are removed. Next, the rim water discharge vacuum breaker 24, the tank water supply vacuum breaker 30, and the jet water discharge vacuum breaker 36, which are arranged above the water storage tank 32, and the pipes connected thereto are removed. Furthermore, the screw which fixes the flange part of the water storage tank 32 to the attachment frame 2a is removed.

  Next, the connecting portions 50a and 50b of the U-shaped pipe 34d connecting the water storage tank 32 and the pressure pump 34 are removed by inserting a hand from the side surface of the functional portion 10 exposed by removing the side panel 10a. Similarly, the connection part 50c of the pressurization pump 34 and the cross pipe 34e is removed. Further, an electrical connector (not shown) connected to the pressurizing pump 34 is also removed. Further, the water storage tank 32 suspended from the mounting frame 2a is pulled up and removed from the flush toilet body 2. Thereby, the pressurization pump 34 suspended from the water storage tank 32 by the metal plate 32c is also removed integrally.

  Next, with reference to FIG. 9 thru | or FIG. 11, the effect | action of the flush toilet 1 by 1st Embodiment of this invention is demonstrated. FIG. 9 is a graph showing the timing at which each part operates when the flush toilet 1 is washed. In order from the top, the rim water discharge electromagnetic valve 22, the tank water supply electromagnetic valve 28, the float switch 32b, and the pressure pump 34 are provided. The operation timing is shown. FIG. 10 is a flowchart showing the cleaning operation of the flush toilet 1.

  First, when a toilet flushing switch (not shown) is operated in the standby state (step S0 in FIG. 10), the process proceeds to step S1 and the first rim water discharge is started. That is, when the user operates a toilet flushing switch (not shown) at time t0 in FIG. 9, the controller 40 sends a signal to the rim water discharge electromagnetic valve 22 to open it, and the rim water discharge port 18 by the water supply pressure. The washing water is discharged from. When the rim water discharge electromagnetic valve 22 is opened, the wash water supplied from the water supply flows into the constant flow valve 20 from the water inlet 20a through the stop cock 42a, the branch fitting 42b, and the strainer 42c. In the constant flow valve 20, when the water supply pressure is high, the flow rate of the wash water that is passed is limited to a predetermined flow rate, and when the water supply pressure is low, the wash water is passed as it is without restricting the flow. The The washing water that has passed through the constant flow valve 20 further passes through the rim water discharge electromagnetic valve 22 disposed on the left side of the flush toilet body 2 and above the drain trap pipe 14 at the center of the flush toilet body 2 behind. The rim water spouting vacuum breaker 24 is reached.

  Further, the wash water that has passed through the rim water spouting vacuum breaker 24 flows into the rim water spouting flapper valve 26 disposed on the left rear side of the flush toilet main body 2 and then flows toward the front of the flush toilet main body 2. The water is discharged from a rim water spouting port 18 that is opened on the rear left side of the upper portion of the bowl portion 12 through the side water supply passage 18a. The washing water discharged from the rim water spouting port 18 flows downward while turning in the bowl portion 12, and the inner wall surface of the bowl portion 12 is washed.

  After a predetermined time has passed, the process proceeds to step S2 where jet water spouting is started. That is, the controller 40 sends a signal to the pressurizing pump 34 to activate it at time t1 in FIG. When the pressurization pump 34 is activated, the wash water stored in the water storage tank 32 is pressurized. The washing water pressurized by the pressure pump 34 disposed on the right rear side of the flush toilet main body 2 flows to the opposite side of the drain trap pipe 14 through the transverse pipe 34e, and then the right side of the drain trap pipe 14 To the jet water spouting vacuum breaker 36. The wash water that has passed through the jet water spouting vacuum breaker 36 flows into a jet water spouting flapper valve 38 disposed under the rim water spouting flapper valve 26 on the left side of the flush toilet main body 2. The washing water that has passed through the jet water spouting flapper valve 38 flows toward the front of the flush toilet main body 2, passes through the jet-side water supply passage 16a below the rim-side water supply passage 18a, and opens at the bottom of the bowl portion 12. It is discharged from the jet spout 16.

  The washing water discharged from the jet spout 16 flows into the drain trap pipe 14 and fills the drain trap pipe 14 to cause a siphon phenomenon. Due to this siphon phenomenon, the accumulated water and dirt in the bowl portion 12 are sucked into the drain trap pipe 14 and discharged from the drain pipe D. In the present embodiment, the wash water pressurized by the pressurizing pump 34 is discharged from the jet spout 16 at a large flow rate of about 100 liters / minute, so that the siphon phenomenon in the drain trap pipe 14 is rapidly caused. As a result, the accumulated water and dirt in the bowl portion 12 are quickly discharged. Preferably, the maximum flow rate of the cleaning water discharged from the jet spout 16 is about 75 to 110 liters / minute.

  After a predetermined time has elapsed, the controller 40 sends a signal to the rim water discharge electromagnetic valve 22 to close it at time t2 in FIG. 9 and stops water discharge from the rim water discharge port 18. That is, from time t1 to t2, water discharge from the jet water discharge port 16 and water discharge from the rim water discharge port 18 are simultaneously performed. When the pressurization pump 34 is activated during water discharge from the water discharge from the rim water discharge port 18 and the water discharge from the jet water discharge port 16 is started, the start-up sound of the pressure pump 34 is masked by the sound of the rim water discharge and is conspicuous Disappear.

  When the pressurization pump 34 is activated and the cleaning water in the water storage tank 32 is discharged from the jet water outlet 16, the water level in the water storage tank 32 is lowered. The float switch 32b disposed in the water storage tank 32 is turned off at time t3 in FIG. 9, and it is detected that the water level has decreased.

  Next, at time t4 in FIG. 9, the controller 40 sends a signal to the pressurizing pump 34 to start gradually decreasing the rotational speed of the motor 34b built in the pressurizing pump 34. Thereby, the water discharge flow rate from the jet water discharge port 16 is also gradually reduced substantially linearly with respect to time.

  Next, the process proceeds to step S3 in FIG. 10, and the second rim water discharge is started. That is, at time t <b> 5 in FIG. 9, the controller 40 sends a signal to the rim water discharge electromagnetic valve 22 to open it, and starts the second water discharge from the rim water discharge port 18. Thereby, the water discharge from the rim water discharge port 18 is superimposed on the water discharge from the jet water discharge port 16 where the water discharge flow rate is gradually decreasing. Here, while water discharge is performed at the maximum flow rate from the jet spout 16, the flow rate of the wash water discharged from the drain trap pipe 14 and the flow rate of the wash water flowing from the jet spout port 16 are substantially equal. Therefore, the siphon phenomenon in the drain trap pipe 14 is sustained and is not interrupted. Further, by gradually decreasing the water discharge flow rate from the jet water discharge port 16 from the maximum flow rate, it is possible to prevent the occurrence of a loud siphon breakage sound due to a sudden break in the siphon phenomenon. In addition, by superimposing water discharged from the rim water spouting port 18, the decrease in the water discharge flow rate becomes more gradual, and the sound when the siphon phenomenon is interrupted is further reduced.

  Next, the rotational speed of the gradually decreasing motor 34b becomes zero at time t6 in FIG. 9, and the pressurizing pump 34 stops. By operating the pressurizing pump 34 between times t1 and t6, a predetermined amount of jet water is discharged from the jet water outlet 16, and the amount of water stored in the water storage tank 32 becomes substantially zero. When the pressurizing pump 34 is stopped, water discharge from the jet water outlet 16 is stopped. As a result, the vacuum breaker piece 46 (FIG. 8) of the jet water spouting vacuum breaker 36 closes the water inlet 44a, and the stored water in the bowl portion 12 and the wash water in the water storage tank 32 are separated. In the present embodiment, the controller 40 controls the pressurization pump 34 so that the water discharge flow rate is gradually decreased after the water discharge from the jet water outlet 16 at the maximum flow rate for about 2 seconds, and the water discharge flow rate becomes zero in about 1 second. is doing. Preferably, after the water is discharged at the maximum flow rate for about 1.5 to 2 seconds, the water discharge flow rate is controlled to be zero in about 1 to 5 seconds.

  The water level in the bowl portion 12 rises due to the second water discharge from the rim water spouting port 18, and after the predetermined rim water discharge time elapses, the inside of the bowl portion 12 reaches a predetermined overflow water level. At time t <b> 7 in FIG. 9, the controller 40 sends a signal to the rim water discharge electromagnetic valve 22 to close it, and stops the second water discharge from the rim water discharge port 18. In the flowchart shown in FIG. 10, for the sake of simplicity, it is described that jet water discharge is started after the first rim water discharge, and the second rim water discharge is executed after the jet water discharge. In more detail, as shown in FIG. 9, there exists a period in which each water discharge is superimposed.

  Next, the process proceeds to step S4 in FIG. 10 and the replenishment of cleaning water to the water storage tank 32 is started, and the time measuring means 40a built in the controller 40 Start replenishment time measurement. That is, at the time t8 when a predetermined water supply waiting time has elapsed after the water discharge from the rim water discharge port 18 has stopped, the controller 40 sends a signal to the tank water supply electromagnetic valve 28 to open it. When the tank water supply electromagnetic valve 28 is opened, the washing water flowing in from the water inlet 20a passes through the tank water supply electromagnetic valve 28 and the tank water supply channel 32a arranged on the left rear side of the flush toilet body 2 to be washed with water. It flows into the tank water supply vacuum breaker 30 disposed above the drain trap pipe 14 at the center of the back of the toilet body 2. The wash water that has passed through the tank water supply vacuum breaker 30 flows to the right side of the drain trap pipe 14 and flows into the water storage tank 32 from the tip of the tank water supply path 32 a that extends to the vicinity of the bottom of the water storage tank 32. Since the front end of the tank water supply path 32a from which the cleaning water flows out is substantially submerged in the water storage tank 32, noise when the cleaning water flows into the water storage tank 32 is reduced.

  Next, in step S6 in FIG. 10, it is determined whether or not the float switch 32b in the OFF state is turned on. If the float switch 32b is in the OFF state, the process in step S6 is repeated. When the wash water flows into the water storage tank 32 and the water level in the water storage tank 32 reaches the specified water storage amount, the float switch 32b is turned on (time t9 in FIG. 9). When the float switch 32b is turned on, the process proceeds to step S7, and the tank water supply electromagnetic valve 28 is closed. That is, the controller 40 sends a signal to the tank water supply electromagnetic valve 28 to close it. Subsequently, it progresses to step S8 and the time measuring means 40a complete | finishes the measurement of water replenishment time.

  Next, in step S9, the second rim water discharge time (t5 to t7 in FIG. 9) when the toilet flushing is performed next is determined by the water discharge time adjusting means 40b built in the controller 40. First, the water discharge time adjusting means 40b calculates the moving average value of the past 50 times of the water replenishment time measured by the time measuring means 40a. That is, the average of the last 50 times of the water replenishment time Te-Ts, which is the elapsed time from the time Ts when the tank water supply electromagnetic valve 28 is opened (t8 in FIG. 9) to the time Te (t9 in FIG. 9) is closed. The value Tav is calculated. When the average value Tav is less than 5 seconds, the water discharge time adjusting means 40b determines that the flush toilet 1 is installed in an area of a water supply pressure of 0.07 MPa or more, which is a normal pressure. Moreover, when the average value Tav is 5 seconds or more and less than 7 seconds, the water discharge time adjusting means 40b determines that the flush toilet 1 is installed in an area where the water supply pressure is low. Furthermore, when the average value Tav is 7 seconds or more, the water discharge time adjusting means 40b determines that the flush toilet 1 is installed in an ultra-low pressure area where the water supply pressure is 0.03 MPa or less.

  Further, when it is determined that the flush toilet 1 is installed in an area of normal pressure, the water discharge time adjusting means 40b sets the second rim water discharge time at the next toilet flush to 3 seconds. Further, the water discharge time adjusting means 40b sets the second rim water discharge time to 4 seconds when it is determined to be a low pressure area, and to 5.5 seconds when it is determined to be an extremely low pressure area. As a result, in the area where the water supply pressure is high, the rim water is discharged for a long time, and the cleaning water is wasted, or in the area where the water supply pressure is low, the rim water is not discharged for a sufficient period of time. Can be prevented.

Further, as described above, the water discharge time adjusting means 40b sets the second rim water discharge time in the next cleaning based on the average value Tav of the latest 50 water supply times in the past, When the washing is less than 50 times, an average value Tav is calculated by averaging all the past water replenishment times. Furthermore, when the toilet bowl is washed for the first time after the flush toilet 1 is installed, the second rim water discharge time is set to 5.5 seconds so that the washing water does not run out.
In step S9, when the second rim water discharge time when the toilet flushing is performed next time is determined, the process returns to the standby state in step S0.

Next, an operation when water supply to the water storage tank 32 is not stopped due to problems such as the float switch 32b and the tank water supply electromagnetic valve 28 will be described.
If the tank water supply solenoid valve 28 is not closed even if the water tank 32 reaches the specified water level, the water level in the water tank 32 rises higher than the specified water level, and eventually the water tank 32 overflows. It reaches the height of the bottom surface of the release water channel 32d. When the water level of the water storage tank 32 becomes higher than the bottom surface of the release water channel 32d, the wash water in the water storage tank 32 flows out through the release water channel 32d and flows down to the atmosphere opening portion 48a of the jet water spouting vacuum breaker 36.

  During the water supply to the water storage tank 32, since the pressurization pump 34 is not operated, there is no flow of washing water from the pressurization pump 34 to the jet water spouting port 16. For this reason, the vacuum breaker piece 46 of the jet water spouting vacuum breaker 36 is at a lower position where the atmosphere opening portion 48a and the water outlet 44b communicate with each other. Therefore, the wash water flowing down from the release water channel 32d to the atmosphere opening portion 48a flows into the water outlet 44b, and flows into the bowl portion 12 through the jet side water supply channel 16a and the jet water outlet 16. Thereby, the wash water overflowing from the water storage tank 32 is discharged through the bowl portion 12 and the drain trap pipe 14.

  Next, with reference to FIG. 11, the operation of the freeze prevention control means 40c built in the controller 40 will be described. FIG. 11 is a flowchart showing the process of the freeze prevention operation of the flush toilet 1.

  First, in the flush toilet 1, the process of step S101 is executed following step S100, which is a standby state in which toilet cleaning is not executed. In step S101, it is determined whether or not the temperature in the toilet room measured by the temperature sensor 40c of the controller 40 is equal to or lower than a predetermined freeze prevention operating temperature. When the temperature in the toilet room is higher than the freeze prevention operation temperature, the freeze prevention operation after step S102 is not executed, and the process returns to step S100 and the process of step S101 is repeatedly executed. In this embodiment, the freeze prevention operating temperature is set to 5 ° C. The freeze prevention operation is also executed when the user sets the freeze prevention operation with an operation switch (not shown) provided in the flush toilet 1. In the present embodiment, the freeze prevention operation is configured to be set by a special operation of an operation switch (not shown). That is, the freeze prevention operation is set by simultaneously operating a plurality of operation switches (not shown) for executing other functions at the same time or by continuously pressing them for a predetermined time.

  Next, when the temperature in the toilet room is equal to or lower than the freeze prevention operation temperature, the process of step S102 is executed. In step S102, the freeze prevention control means 40c opens the rim water discharge electromagnetic valve 22. By opening the rim water discharge electromagnetic valve 22, the wash water supplied from the water supply is provided with a water stop cock 42 a, a branch fitting 42 b, a strainer 42 c, a constant flow valve 20, a rim water discharge electromagnetic valve 22, by the water supply pressure. Water is discharged from the rim water spouting port 18 into the bowl portion 12 at a flow rate of about 15 liters / minute through the rim water discharging vacuum breaker 24, the rim water discharging flapper valve 26, and the rim side water supply passage 18a. Thereby, the wash water staying in these water supply systems is moved, and the freezing thereof is prevented. After about 1 second, step S103 is executed, and the freeze prevention control means 40c closes the rim water discharge electromagnetic valve 22.

  Next, in step S104, the freeze prevention control means 40c rotates the pressure pump 34 at a low speed. When the pressurizing pump 34 is rotated, the wash water in the water storage tank 32 passes through the pressurizing pump 34, the jet water spouting vacuum breaker 36, the jet water spouting flapper valve 38, and the jet water supply passage 16a, and the jet water spouting port. 16 is discharged. Thereby, the wash water staying in these water supply systems is moved, and the freezing thereof is prevented. After about 20 seconds, which is a predetermined antifreezing pump operating time, step S105 is executed, and the antifreezing control means 40c stops the pressurizing pump 34. In the present embodiment, the pressurizing pump 34 is operated at the rotation speed at which the wash water is discharged from the jet water outlet 16 at a flow rate of about 0.7 liter / min. By discharging water from the jet water outlet 16 at such a low flow rate, the washing water staying in the water supply system can be moved without causing a siphon phenomenon in the drain trap pipe 14. As a result, noise due to the occurrence of the siphon phenomenon is prevented, and the waste of washing water is minimized.

  Next, in step S106, the state of the float switch 32b is determined. The amount of wash water stored in the water storage tank 32 is reduced by operating the pressure pump 34 for about 20 seconds. The float switch 32b provided in the water storage tank 32 is turned off when the amount of stored water is equal to or less than a predetermined amount of stored water. If the float switch 32b is OFF, the process proceeds to step S107, and in step S107, the freeze prevention control means 40d opens the tank water supply electromagnetic valve 28 and replenishes the wash water in the water storage tank 32. That is, the float switch 32b and the tank water supply solenoid valve 28 function as a water storage amount maintaining means. By opening the tank water supply electromagnetic valve 28, the wash water supplied from the water supply is the stop cock 42 a, the branch fitting 42 b, the strainer 42 c, the constant flow valve 20, the tank water supply electromagnetic valve 28, and the tank water supply vacuum. Water is supplied into the water storage tank 32 through the breaker 30. Thereby, the wash water staying in these water supply systems is moved, and the freezing thereof is prevented.

  When the amount of water stored in the water storage tank 32 increases to a predetermined water storage amount due to the supply of water into the water storage tank 32 and rises to a predetermined water level, it is detected in step S106 that the float switch 32b is turned on. If it is determined that the float switch 32b has been turned ON, the process proceeds to step S108, and in step S108, the freeze prevention control means 40d closes the tank water supply electromagnetic valve 28. Next, in step S109, the timer 40e built in the controller 40 starts measuring the time until the freeze prevention operation is next executed. In step S110, after the start of measurement by the timer 40e, it is determined whether or not a predetermined time interval of the freeze prevention operation has elapsed. In the present embodiment, 10 minutes is set as the time interval for the freeze prevention operation.

  The process in step S110 is repeatedly executed when 10 minutes as the time interval of the freeze prevention operation has not elapsed, and when 10 minutes have elapsed, the process returns to the standby state in step S100. When returning to the standby state of step S100, the process proceeds to step S101 again, and it is determined whether or not the temperature measured by the temperature sensor 40c has risen to a temperature higher than the freeze prevention operating temperature. If the temperature in the toilet room is still below the freeze prevention operating temperature, the process proceeds to step S102 and the above process is repeated. On the other hand, when the temperature in the toilet room has risen to a temperature higher than the freeze prevention operation temperature, the process returns to step S100, and the determination in step S101 is repeatedly executed.

  In addition, even when the flush toilet 1 is manually set to perform the freeze prevention operation, the freeze prevention operation after step S102 is executed. This freeze prevention operation is repeated until the user cancels the setting of the freeze prevention operation by an operation switch (not shown). As described above, when the temperature in the toilet room is lower than the freeze prevention operation temperature and when the freeze prevention operation is set by the user, the jet water outlet 16 and the rim outlet 18 Water discharge is executed intermittently at intervals of about 10 minutes. Thereby, the wash water staying in each part of the flush toilet 1 is moved, and its freezing is prevented.

  According to the flush toilet of the first embodiment of the present invention, the wash water overflowed from the water storage tank is caused to flow down and discharged to the atmosphere opening portion of the jet water spouting vacuum breaker. Back flow to the tank can be prevented.

  Further, according to the flush toilet of the present embodiment, overflow water is allowed to flow down to the atmosphere opening portion of the jet water spouting vacuum breaker, so even when the release water channel is disposed at a position lower than the upper end surface of the bowl portion. The backflow of the cleaning water in the bowl portion to the water storage tank can be prevented.

  Next, with reference to FIG.12 and FIG.13, the flush toilet by 2nd Embodiment of this invention is demonstrated. FIG. 12 is a perspective view of the flush toilet according to the present embodiment as viewed from the upper left oblique front, and FIG. 13 is a perspective view as viewed from the upper right rear oblique. The flush toilet of this embodiment is different from the first embodiment in the drainage path for overflowing the wash water in the water storage tank. Therefore, only the points different from the first embodiment of the flush toilet according to the present embodiment will be described here, and the same components are denoted by the same reference numerals and description thereof will be omitted.

  As shown in FIGS. 12 and 13, a flush toilet 100 according to the second embodiment of the present invention includes a flush toilet body 102, a toilet seat disposed on the upper surface of the flush toilet body 102, a cover, and local washing. And a device. A functional unit 110 is disposed behind the flush toilet main body 102, and the functional unit 110 is covered with a side panel. 12 and 13 show the flush toilet 100 with the toilet seat, cover, local cleaning device, and side panel removed.

  The flush toilet main body 102 is formed with a bowl portion 12, a drain trap pipe 14, a jet spout 16, and a rim spout 18. The flush toilet 100 according to the present embodiment is directly connected to a water supply system that supplies cleaning water. The cleaning water is discharged from the rim spout 18 by the water supply pressure and pressurized by a pressure pump. Is discharged from the jet water outlet 16.

  Further, a drain groove 102 c is formed at the rear of the bowl portion 12 of the flush toilet main body 102. The drain groove 102c is a recess having a substantially rectangular cross section formed in the center of the rear upper end surface of the bowl portion 12 so as to extend in the front-rear direction of the flush toilet 100. It is configured to flow down. In addition, the drain groove 102c is configured to accommodate a cleaning nozzle (not shown) of a local cleaning device (not shown in FIGS. 12 and 13) when the flush toilet 100 is used. Yes.

  As shown in FIGS. 12 and 13, the functional unit 110 includes a constant flow valve 20, a rim water discharge electromagnetic valve 22, a rim water discharge vacuum breaker 24, a rim water discharge flapper valve 26, and a tank water supply electromagnetic wave. A valve 28, a tank water supply vacuum breaker 30, a water storage tank 132, a pressurizing pump 34, a jet water spouting vacuum breaker 36, and a jet water spouting flapper valve 38 are incorporated. Further, the function unit 110 incorporates a controller (not shown) which is a cleaning control means for controlling the rim water discharge electromagnetic valve 22, the tank water supply electromagnetic valve 28, and the pressurizing pump 34.

  The water storage tank 132 is disposed on the side of the drainage groove 102c and the drainage trap pipe 14, and a release water channel 132d for overflowing the cleaning water in the water storage tank 132 is formed at the upper part thereof. The release water channel 132d is a wide water channel that extends obliquely forward from the water storage tank 132 to the flush toilet 100, and its tip communicates with the side surface of the drainage groove 102c. Further, the bottom surface of the release water channel 132d, which is the overflow edge of the water storage tank 132, is positioned at a position higher than the upper end surface of the bowl portion 12, and the overflow water flowing out from the release water channel 132d is from the upper end surface of the bowl portion 12. Falls into the lower drainage groove 102 c and flows into the bowl portion 12.

  Next, the operation of the flush toilet 100 according to the second embodiment of the present invention will be described. Since the toilet flushing action, the action of adjusting the water discharge time, and the freeze prevention operation of the flush toilet 100 according to this embodiment are the same as those in the first embodiment, the description thereof is omitted.

  Here, an operation when water supply to the water storage tank 132 is not stopped due to malfunctions of the float switch (not shown in FIGS. 12 and 3), the tank water supply electromagnetic valve 28, and the like will be described.

  If the tank water supply solenoid valve 28 is not closed even if the water tank 132 reaches the specified water level, the water level in the water tank 132 rises higher than the specified water level, and eventually overflows the water tank 132. It reaches the height of the bottom surface of the release water channel 132d. When the water level of the water storage tank 132 becomes higher than the bottom surface of the release water channel 132d, the wash water in the water storage tank 132 flows out through the release water channel 132d and flows down to the drainage groove 102c of the flush toilet main body 102. The overflow water that has flowed down into the drainage groove 102 c flows forward through the drainage groove 102 c and flows into the bowl portion 12. Thereby, the wash water overflowing from the water storage tank 132 is discharged through the bowl portion 12 and the drain trap pipe 14.

  According to the flush toilet of the second embodiment of the present invention, the wash water overflowed from the water storage tank is caused to flow down into the drainage groove formed on the upper end surface of the bowl portion and is discharged. Back flow to the water storage tank can be prevented.

  Further, according to the flush toilet of the present embodiment, the drainage groove is formed in the center of the rear part of the bowl portion so as to extend in the front-rear direction of the flush toilet body, so that the drainage groove is not impaired without deteriorating the appearance of the flush toilet. Can be provided. Furthermore, since the drainage groove is formed at a position where there is little possibility of entry of filth, it does not become unsanitary.

  Furthermore, according to the flush toilet of the present embodiment, since the water storage tank is disposed on the side of the drainage groove and the drainage trap pipe, the release waterway can connect the water storage tank and the drainage groove at the shortest distance. it can.

  Further, according to the flush toilet of the present embodiment, the release water channel communicates with the side surface of the drainage groove and is formed wide so that a sufficient flow area is ensured while keeping the height of the release water channel low. Can do.

  Next, a flush toilet according to a third embodiment of the present invention will be described with reference to FIGS. The flush toilet according to this embodiment is different from the first embodiment in the arrangement of a water storage tank, a pressure pump, a vacuum breaker, and the like. Therefore, only the parts different from the first embodiment of the flush toilet according to this embodiment will be described here. FIG. 14 is a perspective view of the flush toilet according to the present embodiment as seen from the upper left rear side. 15 is a top view of the flush toilet according to the present embodiment, FIG. 16 is a cross-sectional view taken along line XVI-XVI in FIG. 15, and FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG. 14 to 17 show the flush toilet according to the present embodiment with the toilet seat, the cover, the local cleaning device, and the side panel removed.

  As shown in FIGS. 14 to 17, a flush toilet 200 according to a third embodiment of the present invention includes a flush toilet body 202, a toilet seat (not shown), a cover (not shown), and a local washing device. (Not shown). A functional unit 210 is disposed behind the flush toilet main body 202, and the functional unit 210 is covered with a side panel (not shown).

  The flush toilet main body 202 is made of earthenware, and has a bowl portion 212, a drain trap conduit 214, a jet spout 216, and a spout 218. The drain trap pipe 214 extends rearward and obliquely upward from the bottom of the bowl portion 212, then extends downward, and is connected to the drain socket 215. The drain socket 215 is connected to a drain pipe (not shown) provided on the wall surface.

  Next, the configuration of the functional unit 210 will be described. As shown in FIGS. 14 to 17, the function unit 210 includes a constant flow valve (not shown), a rim water discharge electromagnetic valve 222, a rim water discharge vacuum breaker 224, as a water supply system for rim water discharge, A rim water spouting flapper valve 226 is incorporated. Further, the functional unit 210 includes a tank water supply electromagnetic valve 228, a water storage tank 232, a pressurizing pump 234, a jet water discharge vacuum breaker 236, and a jet water discharge flapper valve 238 as a water supply system for jet water discharge. Built in. Further, the function unit 210 incorporates a controller (not shown) which is a cleaning control means for controlling the rim water discharge electromagnetic valve 222, the tank water supply electromagnetic valve 228, and the pressurizing pump 234.

  In the present embodiment, the rim water spouting electromagnetic valve 222 is disposed substantially at the rear center of the flush toilet body 202. The rim water discharge vacuum breaker 224 is arranged in the middle of the rim side water supply path 218 a that guides the cleaning water that has passed through the rim water discharge electromagnetic valve 222 to the rim water discharge port 218. Further, the rim water discharge vacuum breaker 224 is disposed about 25.4 mm (about 1 inch) above the upper end surface of the bowl portion 212 to reliably prevent backflow. In the present embodiment, the rim water discharge vacuum breaker 224 is disposed above the drain trap conduit 14 at the substantially rear center of the flush toilet main body 202.

  The rim water spouting flapper valve 226 is disposed in the rim-side water supply passage 218a on the downstream side of the rim water spouting vacuum breaker 224, and prevents backflow from the rim water spouting port 218 of the cleaning water. In the present embodiment, the rim spouting flapper valve 226 is disposed on the rear left side of the flush toilet body 202.

  The tank water supply electromagnetic valve 228 is opened and closed by a control signal from the controller, and is configured to supply and stop the wash water to the water storage tank 232. In the present embodiment, the tank water supply solenoid valve 228 is disposed at the substantially rear center of the flush toilet body 202.

  The water storage tank 232 is configured to store cleaning water to be discharged from the jet water outlet 216. In this embodiment, as shown in FIG. 17, the water storage tank 232 has a large flushing capacity from the rear right side of the flush toilet body 202 over the drain trap conduit 214 at the center of the rear of the flush toilet body 202. It arrange | positions so that it may extend in reverse L shape to the back left side of the toilet bowl main body 202. FIG. An attachment frame 202a as an attachment portion is fixed to the rear of the flush toilet main body 202.

  Furthermore, in the present embodiment, the tip of the tank water supply path 232a is opened above the water storage tank 232, and an air gap is provided between the tank water supply path 232a and the wash water in the water storage tank 232. For this reason, since the washing water in the water storage tank 232 does not flow back into the tank water supply path 232a, the vacuum breaker for tank water supply is omitted.

  An overflow pipe 232d, which is a release water channel, is attached to the upper part of the water storage tank 232. The overflow pipe 232d is provided so that the position higher than the upper end surface of the bowl portion 212 above the water storage tank 232 communicates with the rim-side water supply path 218a. For this reason, when the water level in the water storage tank 232 rises to the height at which the overflow pipe 232d is connected, the wash water in the water storage tank 232 passes through the overflow pipe 232d and the rim side water supply path 218a, and reaches the rim. The water is discharged from the water outlet 218 into the bowl portion 212. Moreover, since the overflow pipe 232d is connected to a position higher than the upper end surface of the bowl 212 of the water storage tank 232, the wash water in the bowl 212 flows back to the water storage tank 232 through the overflow pipe 232d. There is no.

  The pressurizing pump 234 is configured to pressurize the wash water stored in the water storage tank 232 and discharge it from the jet water outlet 216. In the present embodiment, the pressurizing pump 234 is disposed under the inverted L-shaped horizontal portion of the water storage tank 232, that is, substantially at the rear center of the flush toilet body 202.

  As shown in FIG. 17, a suction nozzle 234 a extending downward in the water storage tank 232 is attached to the pressure pump 234. The suction nozzle 234a extends to the vicinity of the bottom of the water storage tank 232, and the wash water in the water storage tank 232 is sucked up by the pressure pump 234 through the suction nozzle 234a and pressurized. Further, the washing water pressurized by the pressurizing pump 234 flows into the jet water discharge vacuum breaker 236 and is discharged from the jet water discharge port 216 through the jet side water supply path 216a.

  The jet water spouting vacuum breaker 236 is connected to the downstream side of the pressurizing pump 234 so as to prevent the accumulated water in the bowl portion 212 from flowing back to the water storage tank 232 side and to perform edge cutting between them. It is configured. Thereby, the stored water level in the water storage tank 232 can be set higher than the stored water level in the bowl portion 212. In the present embodiment, the jet water spouting vacuum breaker 236 is disposed substantially at the rear center of the flush toilet main body 202.

  The jet water spouting flapper valve 238 is connected to the downstream side of the jet water spouting vacuum breaker 236 to prevent a reverse flow from the jet water spouting port 216 of the cleaning water. The cleaning water that has passed through the jet water spouting flapper valve 238 is configured to be discharged from the jet water spouting port 216 through the jet side water supply path 216a. In this embodiment, the jet water spouting flapper valve 238 is disposed above the drain trap pipe 214 behind the flush toilet body 202. That is, the wash water stored in the water storage tank 232 and pressurized by the pressure pump 234 is discharged from the jet water discharge port 216 through the jet water discharge vacuum breaker 236, the jet water discharge flapper valve 238, and the jet side water supply channel 216a. It is configured to be.

  In the present embodiment, the rim side water supply path 218a extending from the rim water spouting flapper valve 226 and reaching the rim water spouting port 218 is also arranged on the same side as the jet side water supply path 216a with respect to the drain trap pipe 214. Yes.

Next, the operation of the flush toilet 200 according to the third embodiment of the present invention will be described.
First, when a toilet flushing switch (not shown) is operated in the standby state, the first rim water discharge is started. That is, a controller (not shown) sends a signal to the rim water discharge electromagnetic valve 222 to open it, and discharges wash water from the rim water discharge port 218 by the water supply pressure. The washing water flowing in from the water inlet 220a passes through the rim water discharge electromagnetic valve 222 arranged at the rear center of the flush toilet body 202, and is arranged above the drain trap pipe 214 at the rear center of the flush toilet body 2. The rim water discharge vacuum breaker 224 is reached.

  Further, the washing water that has passed through the rim water spouting vacuum breaker 224 flows into the rim water spouting flapper valve 226 disposed on the rear left side of the flush toilet main body 202, and then flows toward the front of the flush toilet main body 202, The water is discharged from a rim spout 218 that opens to the rear left side of the upper portion of the bowl portion 212 through the side water supply passage 218a. The washing water discharged from the rim water spouting port 218 flows downward while turning in the bowl portion 212, and the inner wall surface of the bowl portion 212 is washed.

  After a predetermined time has elapsed, the controller starts jet water discharge. That is, the controller sends a signal to the rim water discharge electromagnetic valve 222 to close it, and sends a signal to the pressurizing pump 234 to activate it, and pressurizes the wash water stored in the water storage tank 232. . The washing water pressurized by the pressurizing pump 234 arranged at the rear center of the flush toilet main body 202 reaches the jet water spouting vacuum breaker 236 arranged above the drain trap pipe 214. The wash water that has passed through the jet water spouting vacuum breaker 236 flows into the jet water spouting flapper valve 238. The wash water that has passed through the jet water spouting flapper valve 238 flows toward the front of the flush toilet main body 202, and is discharged from the jet water discharge port 216 that opens to the bottom of the bowl portion 212 through the jet side water supply passage 216a.

  Wash water discharged from the jet spout 216 flows into the drain trap pipe 214 and fills the drain trap pipe 214 to cause a siphon phenomenon. Due to this siphon phenomenon, the accumulated water and dirt in the bowl portion 212 are sucked into the drain trap pipe 214 and discharged from the drain pipe D provided on the wall surface through the drain socket 215.

  Next, the second rim water discharge is started. That is, the controller sends a signal to the rim water discharge electromagnetic valve 222 to open it, and starts the second water discharge from the rim water discharge port 218. The water level in the bowl portion 212 rises due to the second water discharge from the rim water discharge port 218, and after the predetermined rim water discharge time elapses, the inside of the bowl portion 212 reaches a predetermined overflow water level. Further, the controller sends a signal to the rim water discharge electromagnetic valve 222 to close it, and stops the second water discharge from the rim water discharge port 218.

  Next, replenishment of cleaning water to the water storage tank 232 is started. That is, after water discharge from the rim water discharge port 218 has stopped, after a predetermined water supply waiting time has elapsed, the controller sends a signal to the tank water supply electromagnetic valve 228 to open it. When the tank water supply electromagnetic valve 228 is opened, the wash water flowing in from the water inlet 220 a passes through the tank water supply electromagnetic valve 228 and the tank water supply path 232 a and flows into the water storage tank 232. When the wash water flows into the water storage tank 232 and the water level in the water storage tank 232 reaches a specified water storage amount, the tank water supply electromagnetic valve 228 is closed, and one toilet flushing is completed.

  Further, when the water level in the water storage tank 232 rises above a predetermined water level higher than the upper end surface of the bowl portion 212 due to a failure of the water supply system to the water storage tank 232, the wash water in the water storage tank 232 is The water passes through the overflow pipe 232d and the rim side water supply path 218a, and is discharged from the rim spout 218 into the bowl portion 212. As a result, overflow of the wash water from the water storage tank 232 is prevented.

  Next, with reference to FIG.18 and FIG.19, the flush toilet by the modification of 3rd Embodiment of this invention is demonstrated. The flush toilet according to this modification is different from the above-described third embodiment in the drain socket connected to the drain trap conduit of the flush toilet body. 18 is a side sectional view of a flush toilet according to this modification, and FIG. 19 is a sectional view taken along the line XIX-XIX in FIG.

  As shown in FIGS. 18 and 19, in the flush toilet according to this modification, a drain socket 250 is connected to the lower end of a drain trap pipe 214 extending vertically downward. The drain socket 250 extends vertically downward from the inlet end connected to the drain trap pipe 214, and then bends at a right angle toward the front of the flush toilet main body 202, with the outlet end provided on the floor surface. Connected to D. The flush toilet main body used in this modification is the same as the flush toilet main body used in the third embodiment of the present invention, but the drain pipe provided on the wall surface by replacing the drain socket. It is possible to cope with so-called P-type piping connected to the pipe and so-called S-type piping connected to the drain pipe provided on the floor surface.

1 is a right side view of a flush toilet according to a first embodiment of the present invention. It is a top view of the flush toilet according to the first embodiment of the present invention. 1 is a left side view of a flush toilet according to a first embodiment of the present invention. It is the perspective view which looked at the flush toilet by 1st Embodiment of this invention from back right diagonally upward. It is the perspective view which looked at the flush toilet by 1st Embodiment of this invention from back left diagonally. It is sectional drawing which follows the VI-VI line of FIG. It is a block diagram which shows the rim water discharge and the water supply system of jet water discharge. It is sectional drawing of the vacuum breaker for jet water spouting. It is a graph which shows the timing which each part act | operates at the time of washing of a flush toilet. It is a flowchart which shows the washing | cleaning effect | action of a flush toilet. It is a flowchart which shows the process of the freeze prevention driving | operation of a flush toilet. It is the perspective view which looked at the flush toilet by 2nd Embodiment of this invention from the front left diagonal upper direction. It is the perspective view which looked at the flush toilet by 2nd Embodiment of this invention from back right diagonally. It is the perspective view which looked at the flush toilet by 3rd Embodiment of this invention from back left diagonally. It is a top view of a flush toilet according to a third embodiment of the present invention. It is sectional drawing which follows the XVI-XVI line of FIG. It is sectional drawing which follows the XVII-XVII line of FIG. It is side surface sectional drawing of the flush toilet bowl by the modification of 3rd Embodiment of this invention. It is sectional drawing which follows the XIX-XIX line | wire of FIG.

Explanation of symbols

D Drain pipe 1 Flush toilet 2 according to the first embodiment of the present invention 2 Flush toilet main body 2a Mounting frame 2b Water receiving tray 4 Toilet seat 6 Cover 8 Local cleaning device 10 Functional section 10a Side panel 12 Bowl section 14 Drain trap pipe 16 Jet water outlet 16a Jet side water supply path 18 Rim water outlet 18a Rim side water supply path 20 Constant flow valve 20a Water inlet 22 Rim water discharge electromagnetic valve 24 Rim water discharge vacuum breaker 26 Rim water discharge flapper valve 28 Tank water supply electromagnetic valve 30 Tank Vacuum breaker for water supply 32 Water storage tank 32a Tank water supply channel 32b Float switch 32c Metal plate 32d Release water channel 34 Pressure pump 34a Impeller 34b Motor 34c Drain tap 34d U-shaped pipe 34e Transverse pipe 36 Vacuum breaker for jet water discharge 38 Jet water spouting flapper valve 40 Controller 40a Timekeeping means 40b Water discharge time adjusting means 40c Temperature sensor 40d Freezing prevention control means 40e Timer 42a Water stop cock 42b Branch fitting 42c Strainer 44 Valve body 44a Water inlet 44b Water outlet 46 Vacuum breaker body valve 46a Part 46b Shaft part 46c Lower surface sealing material 46d Upper surface sealing material 48 Vacuum breaker body 48a Atmospheric release part 48b Guide part 50a, 50b, 50c Connection part 100 Flush toilet according to the second embodiment of the present invention 102 Flush toilet bowl main body 102c Drain groove DESCRIPTION OF SYMBOLS 110 Function part 132 Water storage tank 132d Release water channel 200 Flush toilet according to the third embodiment of the present invention 202 Flush toilet main body 210 Function part 212 Bowl part 214 Drain trap pipe 215 Drain Socket 216 Jet water outlet 216a Jet side water supply path 218 Rim water outlet 218a Rim side water supply path 222 Rim water discharge electromagnetic valve 224 Rim water discharge vacuum breaker 226 Rim water discharge flapper valve 228 Tank water supply electromagnetic valve 232 Water storage tank 232a Tank water supply path 232d Overflow pipe 234 Pressure pump 234a Suction nozzle 236 Vacuum breaker for jet water discharge 238 Flapper valve for jet water discharge 250 Drain socket

Claims (1)

A flush toilet flushed with pressurized flush water,
A flush toilet body provided with a bowl portion formed with a jet spout and a drain trap pipe extending from the bottom of the bowl portion;
A pressurizing pump for pressurizing cleaning water for cleaning the bowl part;
A jet-side water supply channel that guides wash water pressurized by the pressurization pump to the jet spout;
A jet water breaker vacuum breaker provided in the middle of this jet-side water supply path;
A water storage tank for storing cleaning water to be pressurized by the pressure pump;
A release water channel that causes the wash water that has overflowed from the water storage tank to flow down to the atmosphere opening portion of the jet water spouting vacuum breaker when the water level of the water in the water storage tank rises above a predetermined water level;
A flush toilet characterized by having.

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