JP2010156201A - Flush toilet bowl - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flush toilet bowl hardly influenced by the pressure of tap water, reducing noise generated at the end of siphon action and satisfying a request for water saving. <P>SOLUTION: The flush toilet bowl has: a toilet bowl body 2 including a bowl 12, a rim water discharge port 18, a jet water discharge port 16 and drain tap pipeline 14; a water storage tank 120; a pressurizing pump 122 pressurizing flush water in the water storage tank; a rim water discharge supply means 138 supplying the pressurized flush water to the rim water discharge port 18; a jet water discharge supply means 146 supplying the pressurized flush water to the jet water discharge port 16; and a control means 40 controlling the rim water discharge supply means, the pressurizing pump and the jet water discharge supply means to discharge the flush water to the bowl. The control means controls the rim water discharge supply means, the pressurizing pump and the jet water discharge supply means to first discharge the flush water from the rim water discharge port and then to discharge the quantity of flow to generate siphon action from the jet water discharge port in the continuous state of the discharge of flush water from the rim water discharge port. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

Conventionally, as described in Patent Document 1, a rim water spouting port directly connected to tap water without using a tank and provided in the rim of the bowl portion of the toilet bowl by the pressure of the tap water, and the bottom portion of the bowl portion There is known a flush toilet in which a bowl portion is washed by supplying wash water from a jet spout that is provided in the water and discharges water toward a drain trap pipe.
Further, as described in Patent Document 2, rim water spouting directly supplies tap water from a rim water spouting port, while jet water spouting pressurizes washing water stored in a tank with a pump, A flush toilet in which the bowl portion is washed by discharging the washed water from a jet spout is also known.

  On the other hand, in the flush toilet of Patent Document 2, first, wash water is discharged from the rim spout (pre-rim cleaning), and after the water discharge from the rim spout is completed, the wash water is discharged from the jet spout. Furthermore, after the water discharge from the jet water outlet is completed, the cleaning water is discharged from the rim water outlet again (rear rim cleaning).

Japanese Patent No. 2953002 (Japanese Patent Laid-Open No. 2-229446) JP 2005-264469 A

  However, since the flush toilet described in Patent Document 1 supplies wash water only to the tap water pressure to the bowl portion of the toilet bowl, in areas where the water pressure is low or in buildings where the water pressure is low There is a problem that it cannot be used in low water pressure areas and places like the second and third floors. Also, in this flush toilet, after the siphon action occurs, a relatively large volume of air is sucked from the inlet of the trap pipe and the siphon action is terminated. It was.

Moreover, in the flush toilet described in Patent Document 2, since the wash water stored in the tank is pressurized by the pump and discharged from the jet spout, there is a problem that it cannot be used in low water pressure areas or places. Although it has been solved, the problem of noise is still not solved.
Further, flush toilets have conventionally been requested to save water, and water-saving flush toilets are desired.

  On the other hand, as described above, the flush toilet of Patent Document 2 discharges the wash water from the jet spout after the discharge of the wash water from the rim spout ends, but the amount of jet spout is small. , The time until the occurrence of siphon phenomenon (siphon activation) became longer, and the amount of washing water increased accordingly, which did not meet the demand for water saving.

  Furthermore, as described above, in the flush toilet of Patent Document 1, both the rim water spouting port and the jet water spouting port are directly connected to the water supply. Therefore, in this flush toilet, when the wash water is spouted from the jet spout into the spout from the rim spout (see FIG. 29 of Patent Document 1), the amount of wash water supplied from the water supply is constant. Therefore, the rim water discharge amount must be reduced and the wash water must be discharged from the jet water discharge port. Therefore, the jet water discharge amount is reduced, and as a result, as in Patent Document 2, the siphon phenomenon occurs (siphon activation). It took a long time, and the amount of washing water increased accordingly, which did not satisfy the demand for water saving.

  Accordingly, an object of the present invention is to provide a flush toilet that is less susceptible to the influence of tap water pressure, reduces siphoning noise (noise) generated at the end of siphon action, and can satisfy water saving requirements. Yes.

  Another object of the present invention is to provide a flush toilet capable of shortening the time until the occurrence of siphon action and satisfying the demand for water saving in washing water.

In order to achieve the above-described object, the present invention is a flush toilet that is washed with pressurized wash water, a bowl portion, a rim spout and a jet spout for discharging wash water, and a drain trap pipe. A toilet body provided with a road, a water storage tank for storing cleaning water, a pressure pump for pressurizing the cleaning water stored in the water storage tank, and the cleaning water pressurized by the pressure pump at a predetermined timing Rim water spouting means for supplying to the rim water spouting port, jet water spouting supply means for supplying the cleaning water pressurized by the pressure pump to the jet water spouting port at a predetermined timing, rim water spouting supply means, pressure pump, and Control means for controlling the jet water supply means to discharge cleaning water to the bowl portion of the toilet body. The control means first discharges the cleaning water from the rim water outlet, and then the rim water outlet. Wash water from Water discharge while continuing from the jet water spouting port, a first flow rate for generating a siphon action so that water discharge is characterized by controlling the rim spout water supply means, the pressurizing pump and the jet water spouting supply means.
In the present invention configured as described above, at the time of jet water discharge, a first flow rate for generating a siphon action is discharged from the jet water outlet while the water discharge from the rim water outlet is continued. As a result, by performing jet water discharge while the water level in the bowl and drain trap pipe is raised by rim water discharge, the siphon action is activated in a short time, and a strong siphon action is generated. be able to. Thereby, since the amount of washing water of jet water for starting siphon action can be reduced, water saving can be achieved. Further, in the present invention, the wash water stored in the water storage tank is pressurized by the pressurizing pump and discharged from the rim spout and the jet spout. Will not be affected.

  According to the flush toilet of the present invention, it is difficult to be affected by the pressure of tap water, and siphon-cutting sound (noise) generated at the end of the siphon action can be reduced to meet the demand for water saving.

  Further, according to the flush toilet of the present invention, it is possible to shorten the time until the siphon action occurs and satisfy the demand for water saving of the washing water.

It is a side view which shows the flush toilet bowl by 1st Embodiment of this invention. FIG. 1 is a plan view of a flush toilet. 1 is an overall configuration diagram showing a flush toilet according to a first embodiment of the present invention. It is a time chart which shows the basic operation | movement of the flush toilet by 1st Embodiment of this invention. It is a figure for demonstrating the siphon effect | action and extrusion effect | action by the flush toilet by 1st Embodiment of this invention. FIG. 6 is an enlarged view of FIG. It is a whole block diagram which shows the flush toilet bowl by 2nd Embodiment of this invention. Examples of timing of rim water discharge (front rim cleaning and rear rim cleaning), jet water discharge (jet cleaning), and tank water supply applicable to the first embodiment and / or the second embodiment of the present invention (from the first example) It is a time chart which shows a 5th example. It is a time chart which shows the basic operation | movement of the flush toilet by 3rd Embodiment of this invention. It is a figure for demonstrating the siphon effect | action and the extrusion effect | action by the flush toilet by 3rd Embodiment of this invention. It is a figure for demonstrating the siphon effect | action and the extrusion effect | action by the flush toilet by 3rd Embodiment of this invention. It is a time chart which shows the change of the rotation speed of the pressurization pump in the flush toilet by 4th Embodiment of this invention. It is a whole block diagram which shows the flush toilet bowl by 5th Embodiment of this invention. It is a time chart which shows the basic operation | movement of the flush toilet by 5th Embodiment of this invention.

Next, a flush toilet according to an embodiment of the present invention will be described with reference to the accompanying drawings.
First, the structure of the flush toilet according to the first embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a side view showing a flush toilet according to the first embodiment of the present invention, FIG. 2 is a plan view of the flush toilet shown in FIG. 1, and FIG. 3 is a first embodiment of the present invention. It is a whole block diagram which shows the flush toilet bowl by a form.

  As shown in FIGS. 1 and 2, the flush toilet 1 according to the first embodiment of the present invention is disposed so as to cover the toilet body 2, the toilet seat 4 disposed on the upper surface of the toilet body 2, and the toilet seat 4. And a local cleaning device 8 disposed on the rear upper part of the toilet body 2. Furthermore, a functional unit 10 is disposed behind the toilet body 2, and the functional unit 10 is covered with a side panel 10a.

The toilet body 2 is made of earthenware. The toilet body 2 includes a bowl portion 12 for receiving filth, a drain trap pipe 14 extending from the bottom of the bowl portion 12, a jet water outlet 16 for jet water discharge, and a rim water discharge. A rim water spouting port 18 is formed.
The jet spout 16 is formed at the bottom of the bowl portion 12, is disposed substantially horizontally toward the inlet of the drain trap pipe 14, and discharges wash water toward the drain trap pipe 14. ing.
The rim water spouting port 18 is formed at the upper left rear of the bowl portion 12 and discharges cleaning water along the edge of the bowl portion 12.

  The drain trap pipe 14 includes an inlet 14a, a trap ascending pipe 14b that rises from the inlet 14a, and a trap descending pipe 14c that descends from the trap ascending pipe 14b. The trap ascending pipe 14b and the trap descending pipe 14c 14d is the top portion 14d.

  The flush toilet 1 according to the first embodiment 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. As for the jet water spouting, as will be described later, the washing water stored in the water storage tank 32 built in the functional unit 10 is pressurized by the pressurizing pump 34 and discharged from the jet water spouting port 16 at a large flow rate. It has become.

Next, the functional unit 10 of the flush toilet 1 according to the first embodiment will be described in detail with reference to FIG.
As shown in FIG. 3, the functional unit 10 is provided with a constant flow valve 20, an electromagnetic valve 22, a rim water discharge vacuum breaker 24, and a rim water discharge flapper valve 26. Further, the water supply channel 19 includes a switching valve 28 for switching between water supply to the tank and rim water discharge, a water storage tank 32, a pressure pump 34, a jet water discharge vacuum breaker 36, a jet water discharge flapper valve 38, water A stopper 39 is incorporated. The function unit 10 also includes a controller 40 that controls the opening / closing operation of the electromagnetic valve 22, the switching operation of the switching valve 28, and the rotation speed and operating time of the pressurizing pump 34.

  The constant flow valve 20 is for restricting the wash water flowing from the water inlet 20a through the stop cock 42a, the strainer 42b, and the branch fitting 42c to a predetermined flow rate or less. 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. Further, the wash water that has passed through the constant flow valve 20 flows into the electromagnetic valve 22, and the wash water that has passed through the electromagnetic valve 22 is supplied to the rim water spouting port 18 or the water storage tank 32 by the switching valve 28. ing. This switching valve 28 can supply cleaning water to both the rim-side water supply path 18a which is the rim side and the tank-side water supply path 32a which is the tank side at the same timing, and the water supply amount to the rim side and the tank side This is a switching valve that can arbitrarily change the ratio.

The electromagnetic valve 22 is opened and closed by a control signal from the controller 40 so that the supplied wash water flows into the switching valve 28 or is stopped.
The switching valve 28 is switched by a control signal from the controller 40, and the wash water that has flowed in via the electromagnetic valve 22 is discharged from the rim spout 18 or flows into the water storage tank 32.

  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 switching valve 28 to the rim water discharge port 18, and prevents backflow from the rim water discharge port 18 of the wash water. Further, the rim water spouting vacuum breaker 24 is disposed above the upper end surface of the bowl portion 12, thereby reliably preventing backflow. Further, the washing water overflowing from the air release portion of the rim water spouting vacuum breaker 24 flows into the water storage tank 32 through the return conduit 24a.

  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.

  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, the water storage tank 32 has an internal volume of about 2.5 liters.

  Furthermore, in this embodiment, the front-end | tip (lower end) of the tank water supply path 32a is opened to the position above the water storage tank 32, and the backflow from the water storage tank 32 to the tank water supply path 32a is prevented. Further, an upper end float switch 32b and a lower end float switch 32c are disposed inside the water storage tank 32 so that the water level in the water storage tank 32 can be detected. The upper end float switch 32b is turned on when the water level in the water storage tank 32 reaches a predetermined water storage level, and the controller 40 detects this and closes the electromagnetic valve 22. On the other hand, the lower end float switch 32c is turned on when the water level in the water storage tank 32 falls to a predetermined water level, and the controller 40 detects this and stops the pressurizing pump 34.

  A lid 32d is attached to the upper portion of the water storage tank 32 so as to cover the opening at the upper end thereof, and the outer periphery of the lid 32d and the inner wall surface of the upper portion of the water storage tank 32 are joined in a watertight manner. Yes. Furthermore, the lid 32d is provided with a circular hole, and a cylindrical body 32e is attached so as to extend upward so as to surround the hole.

The wall surface 32g of the water storage tank 32 extends upward from the lid body 32d, and the wash water overflowing from the cylinder 32e of the water storage tank 32 is accumulated on the lid body 32d.
Furthermore, a drainage passage 32f is connected to the wall surface 32g above the lid 32d of the water storage tank 32 so that the cleaning water accumulated on the lid 32d can be discharged to the bowl portion 12.

The pressurizing pump 34 pressurizes the wash water stored in the water storage tank 32 and discharges it from the jet water outlet 16. The pressurizing pump 34 is connected by a cleaning water pipe 34 a extending from the lower portion of the water storage tank 32, and pressurizes the cleaning water stored in the water storage tank 32.
In the present embodiment, the pressurizing pump 34 pressurizes the cleaning water in the water storage tank 32 and discharges the cleaning water from the jet water outlet 16 at a maximum flow rate of about 120 liters / minute. .

  Further, a jet water spouting flapper valve 38 and a water drain plug 39, which are check valves, are provided in the middle of the washing water pipe 34a. The jet water spouting flapper valve 38 and the water drain plug 39 are disposed at a height near the lower end of the water storage tank 32 below the pressurizing pump 34. For this reason, by opening the water drain plug 39, the cleaning water in the water storage tank 32 and the pressure pump 34 can be discharged during maintenance or the like. Further, by disposing a jet water spouting flapper valve 38 between the water storage tank 32 and the pressurizing pump 34, when the water level in the water storage tank 32 becomes lower than the height of the pressurizing pump 34, washing water is added. Backflow from the pressure pump 34 to the water storage tank 32 prevents the wash water in the pressure pump 34 from escaping.

  On the other hand, the outlet of the pressurizing pump 34 is connected to the jet water spouting port 16 at the bottom of the bowl portion 12 through a washing water conduit 34b. In the middle of the washing water pipe 34 b, a convex shape is formed upward, and the washing water pipe top 44, which is the highest part of the convex part, is a washing water pipe extending from the water storage tank 32 to the jet spout 16. It is the highest part of the road.

The jet water spouting vacuum breaker 36 is connected to the branch pipe 36a branched from the downstream side of the pressurizing pump 34 and the washing water pipe top 44, and the stored water in the bowl 12 flows backward to the storage tank 32 side. In addition to preventing this, a edging between them is performed.
Further, the washing water overflowing from the air release portion of the jet water spouting vacuum breaker 36 flows into the water storage tank 32 through the return pipe 36b.

  The controller 40 sequentially operates the electromagnetic valve 22, the switching valve 28, and the pressurization pump 34 by the operation of the toilet flushing switch (not shown) by the user, and sequentially discharges water from the rim water outlet 18 and the jet water outlet 16. Start and wash the bowl 12. Further, after the cleaning is completed, the controller 40 opens the electromagnetic valve 22, switches the switching valve 28 to the water storage tank 32 side, and replenishes the water storage tank 32 with cleaning water. When the water level in the water storage tank 32 rises and the upper end float switch 32b detects the specified water storage amount, the controller 40 closes the electromagnetic valve 22 and stops water supply.

Next, the operation (operation) of the flush toilet 1 according to the first embodiment of the present invention will be described.
First, the basic operation of the flush toilet 1 will be described with reference to FIG.
As shown in FIG. 4, when a toilet flushing switch (not shown) is operated in the standby state (time t0 to t1), the first rim water discharge (pre-rim washing) is started (time t1). That is, when the user operates a toilet flushing switch (not shown), the controller 40 sends a signal to the electromagnetic valve 22 to open it, and also switches the switching valve 28 to the rim water spouting port 18 side by the water supply pressure. Wash water is discharged from the rim spout 18. When the 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 strainer 42b, and the branch fitting 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 wash water that has passed through the constant flow valve 20 passes through the electromagnetic valve 22 and the switching valve 28, passes through the rim water discharge vacuum breaker 24, the rim water discharge flapper valve 26, and the rim-side water supply path 18 a, and reaches the upper part of the bowl portion 12. It is discharged from the rim spout 18 that opens to the rear left side. 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.

Thereafter (time t2), jet water discharge is started, and at the same time, supply of washing water to the water storage tank 32 is also started.
First, the controller 40 sends a signal to the pressurizing pump 34 to activate it, and keeps the pump speed at N1. When the pressurizing pump 34 is activated, the wash water stored in the water storage tank 32 flows into the pressurizing pump 34 through the jet water spouting flapper valve 38 and the drain plug 39 and is pressurized. The washing water pressurized by the pressurizing pump 34 passes through the washing water pipe top 44 of the washing water pipe 34b and is discharged from the jet water outlet 16 opened at the bottom of the bowl part 12.
At this time, the air staying in the vicinity of the washing water pipe top portion 44 of the washing water pipe 34b reaches the jet water spouting vacuum breaker 36 through the branch pipe 36a and is released from the atmosphere opening portion.

  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. Here, in the present embodiment, since the pressurizing pump 34 first rotates at the pump rotation speed N1 (time t2 to t3), the pressurizing force increases, and the washing water is supplied from 75 liters / minute to 120 liters / minute. Can be discharged from the jet spout 16 at a large flow rate, whereby the siphon phenomenon in the drain trap pipe 14 is rapidly caused, and the accumulated water and filth in the bowl portion 12 are quickly discharged.

Thereafter (time t3), the pressure is slightly reduced by lowering the rotational speed of the pump to N2, and the washing water is supplied at a large flow rate of 60 liters / minute to less than 120 liters / minute (in a third embodiment described later). This corresponds to the “first pattern” based on the “second flow rate.”) And is continuously discharged from the jet water outlet 16. As a result, the siphon action caused by the large amount of washing water discharged at the pump rotation speed N2 can be further continued by the “push-out action” described later, and the floating filth remaining in the bowl portion can be quickly discharged. be able to.
Further, the rotational speed N2 of the pump is a value such that the jet water discharge has a flow velocity (3.0 meters / second to 6.2 meters / second) necessary for transporting the filth to the top 14d of the drain trap pipe 14. It is.

  In the present embodiment, as indicated by a broken line in FIG. 4, the pump rotation speed may be maintained as N1 without being reduced to N2 (time t3 to t4).

Furthermore, in this embodiment, at the end of the jet water discharge at the pump rotation speed N2 (time t4 to t5), the rotation speed of the pressure pump is controlled so that the water discharged from the jet water discharge port gradually decreases. Yes.
Thereby, generation | occurrence | production of the big siphon interruption sound which arises when a siphon effect | action interrupts suddenly can be prevented.

  Thus, by operating the pressurizing pump 34 for a predetermined time (time t2 to t5), the wash water is discharged from the jet water outlet 16, and the amount of water stored in the water storage tank 32 becomes substantially zero. By stopping the pressurizing pump 34, water discharge from the jet water discharge port 16 is stopped (time t5). As a result, air is introduced from the jet water spouting vacuum breaker 36 into the cleaning water conduit, and the stored water in the bowl portion 12 and the cleaning water in the water storage tank 32 are separated.

  In the first embodiment, cleaning water is supplied to the water storage tank 32 at the same time during jet water discharge (time t2 to t5). At this time, the controller 40 sends a signal to the switching valve 28 while switching the solenoid valve 22 to the tank side while keeping the electromagnetic valve 22 open. Since the electromagnetic valve 22 is opened, the wash water flowing in from the water inlet 20a passes through the constant flow valve 20, the electromagnetic valve 22, the switching valve 28, and the tank water supply path 32a, and stores water from the tip of the tank water supply path 32a. It flows into the tank 32.

  Next, when the jet water discharge is completed (time t5), the controller 40 sends a signal to the electromagnetic valve 22 to open it again, and starts the second water discharge (rear rim cleaning) from the rim water discharge port 18. Let The water level in the bowl portion 12 rises due to the second water discharge from the rim water discharge port 18, and after the predetermined rim water discharge time has elapsed (time t6), the inside of the bowl portion 12 reaches the predetermined water level.

After completion of the second rim water discharge (time t6), the washing water in the water storage tank 32 is supplied again.
At this time, as described above, the controller 40 sends a signal to the switching valve 28 in a state where the electromagnetic valve 22 is kept open, switches it to the tank side, and flows into the water storage tank 32.

When washing water is replenished in the water storage tank 32 and the water level in the water storage tank 32 reaches a specified water storage level, the float switch 32b is turned on. When the float switch 32b is turned on, the controller 40 sends a signal to the electromagnetic valve 22 to close it.
Here, the values of the times t1 to t7 shown in FIG. 4 are t1 = 0 seconds, t1 to t2 = 8 seconds, t2 to t5 = 2.9 seconds, as shown in FIG. It is preferable that t5 to t6 = 5.5 seconds and t6 to t7 = 13.1 seconds.

Next, the siphon action and the push-out action in the flush toilet according to the present embodiment will be described in detail with reference to FIGS. FIG. 5 is a view for explaining a cleaning mechanism during jet water discharge, that is, siphon action and push-out action, and FIG. 6 is an enlarged view of FIG.
FIG. 5A shows a standby state (time t0 to t1 in FIG. 4), in which water is stored in the bowl portion. Next, as shown in FIG. 5 (b) after passing through the rim water discharge, when the water discharge is started (time t2 in FIG. 4), the pump rotates at the rotation speed N1, and the drain trap is caused by the jet flow with a large flow rate. The pipeline is full of water. Next, as shown in FIG. 5 (c), air is sucked from the inlet portion of the drain trap pipe, and the siphon action ends (time t3 to t4 in FIG. 4).

  However, in this embodiment, since a large amount of jet water is continuously supplied thereafter (from t3 to t4 in FIG. 4), as shown in FIG. 5 (d), suction is performed from the inlet portion of the drain trap pipe. The amount of air that is done is small. Furthermore, even after air is sucked into the drain trap pipe, a large flow of jet water is continuously supplied (time t3 to t4 in FIG. 4), so that FIG. 5 (e) and FIG. As shown, the jet water spouting the lower wall surface of the inlet portion 14a of the drain trap pipe 14 generates a swirling flow in the trap rising pipe 14b, and the swirling flow causes the cross section of the inlet portion 14a to be sealed. In addition, the inlet portion 14a and the trap ascending pipe 14b are almost full. As a result, the siphon action is sustained. That is, in the state shown in FIG. 5 (e) and FIG. 6 (time t3 to t4 in FIG. 4), while the previously generated siphon action is maintained, Extrusion is occurring. By this pushing action, the dirt floating in the bowl portion is quickly discharged from the drain trap pipe.

  In this embodiment, as shown in FIG. 6, the cross section of the inlet portion 14a of the drain trap pipe 14 is sealed, but the cross section of any other part of the drain trap pipe 14 is The siphon action may be maintained by sealing so that the inside of the drain trap pipe is almost full.

Thereafter, as shown in FIG. 5 (f), the amount of washing water of the jet water is gradually reduced (t4 to t5 in FIG. 4), thereby preventing the generation of siphoning noise, and the waste discharging operation is completed gently. To do.
Next, as shown in FIG. 5 (g), rim water discharge (rear rim cleaning) is started (time t5 in FIG. 4), and then the original standby state is entered as shown in FIG. 5 (h). (After time t6 in FIG. 4).

  As described above, in the first embodiment of the present invention, the jet water outlet 16 is arranged substantially horizontally toward the inlet of the drain trap pipe 14. In the case of jet water discharge, first, the siphon phenomenon (action) is rapidly caused by rotating the pressurizing pump 34 at the rotation speed N1 and supplying a large flow rate of jet water discharge to the pipe trap pipe. The accumulated water and filth in the bowl part 12 are quickly discharged. Next, the pressurization pump 34 is rotated at the rotation speed N2 to continuously supply a large amount of jet water spouting. At this time, the jet water spouting collides with the lower wall surface of the inlet portion 14a of the drain trap pipe 14 to raise the trap. A swirling flow is generated in the pipe 14b, whereby the inlet 14a and the trap ascending pipe 14b are almost filled with water, and the cross section of any part thereof is sealed (extrusion action). In this way, the siphon phenomenon (action) can be maintained by rotating the pressurizing pump 34 at the rotation speed N2 and continuously supplying a large amount of jet water discharge (extrusion action). The dirt floating in the bowl portion can be quickly discharged from the drain trap pipe 14.

  As a result, according to the first embodiment of the present invention, since jet water is discharged using the pressurizing pump 34, it is difficult to be influenced by the pressure of tap water, and a large flow rate (N1 and N2 rotational speed pressurization). Since the siphon action is generated abruptly by performing jet water discharge at a flow rate of the pump, the amount of washing water of the jet water is reduced, the water saving requirement is satisfied, and the siphon action is continued by the push action. When the accumulated water in the bowl portion 12 is discharged by the initial siphon action, the siphoning sound at the end of the siphon action caused by sucking a large amount of air from the inlet portion 14a of the drain trap pipe 14 can be eliminated. In addition, the push-out action results in a weaker siphon action than the initial siphon. At the end of this weak siphon, only a weak siphon sound is generated. Fried, it is possible to reduce the siphon cutoff sound.

  Next, a flush toilet according to a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, only parts different from the first embodiment will be described. As shown in FIG. 7, in the second embodiment, a rim water discharge electromagnetic valve 23 and a tank water supply electromagnetic valve 25 are provided in place of the electromagnetic valve 22 and the switching valve 28 of the first embodiment. Specifically, the rim water discharge electromagnetic valve 23 is provided on the downstream side of the constant flow valve 20, and is connected to the rim side water supply path 18a. The tank water supply solenoid valve 25 is provided on the downstream side of the constant flow valve 20 and is connected to the tank water supply path 32a.

The opening / closing operation (ON and OFF operation) of the rim water discharge electromagnetic valve 23 and the tank water supply electromagnetic valve 25 is performed by a control signal from the controller 40.
In the flush toilet according to the second embodiment, the rim water discharge electromagnetic valve 23 and the tank water supply electromagnetic valve 25 can be opened and closed independently, so that the rim water discharge and the tank water supply will be described later. Can be performed at the same timing.

Next, referring to FIG. 8, the timing of rim water discharge (front rim cleaning and rear rim cleaning), jet water discharge (jet cleaning), and tank water supply applicable to the first embodiment and / or the second embodiment of the present invention. Examples (first to fifth examples) will be described.
8A shows a first example, FIG. 8B shows a second example, FIG. 8C shows a third example, FIG. 8D shows a fourth example, and FIG. The fifth example is shown in FIG.

First, the first example of FIG. 8A is the same as that shown in FIG. In this first example, first, the front rim cleaning is performed for 8 seconds, then the jet cleaning is performed for 2.9 seconds, and at the same time, the tank water supply is performed for 2.9 seconds. Thereafter, post-rim cleaning is performed for 5.5 seconds. Finally, tank water supply is performed for 13.1 seconds.
According to the first example, since the tank water supply (chasing water is added) while the pressurizing pump is driven, the flow rate of the jet water discharge can be maximized. Further, since the rear rim cleaning and the tank water supply are performed independently, the cleaning water can go around the bowl portion in the rear rim cleaning, and the cleaning effect can be enhanced.

Next, in the second example of FIG. 8B, first, after the front rim cleaning is performed for 8 seconds, the rear rim cleaning is continuously performed for 5.5 seconds. Also, just before the front rim cleaning is completed, the jet cleaning is performed for 2.9 seconds and the tank water supply is performed for 2.9 seconds. Then, after cleaning the rear rim, tank water supply is performed for 13.1 seconds.
According to the second example, since the rear rim cleaning is performed continuously after the front rim cleaning, the rim cleaning can be easily controlled. Further, since the tank water supply (chasing water is added) while the pressurizing pump is driven, the flow rate of the jet water discharge can be maximized.

Next, in the third example of FIG. 8C, first, after the front rim cleaning is performed for 8 seconds, the rear rim cleaning is continuously performed for 24 seconds. Also, jet cleaning is performed for 2.9 seconds immediately before the end of the front rim cleaning.
Thereafter, after the start of the rear rim cleaning, the tank water supply is performed for 21 seconds, and the rear rim cleaning and the tank water supply are completed simultaneously.
According to the third example, since the rear rim cleaning and the tank water supply are completed at the same time, it can be recognized that the tank water supply is performed during the refilling of the cleaning water into the bowl portion.

Next, in the fourth example of FIG. 8D, first, the front rim cleaning is performed for 8 seconds, then the jet cleaning is performed for 2.9 seconds, and then the rear rim cleaning is performed for 24 seconds. On the other hand, the tank water supply starts at the same time as the jet cleaning, is performed for 21 seconds, and ends earlier than the rear rim cleaning.
According to the fourth example, the tank water supply is given priority over the rear rim cleaning, so that the tank water supply can be reliably performed.

Next, in the fifth example of FIG. 8E, first, after the front rim cleaning is performed for 8 seconds, the rear rim cleaning is continuously performed for 24 seconds. Moreover, jet cleaning is performed for 2 seconds immediately before the end of the front rim cleaning, and then tank water supply is performed for 21 seconds immediately thereafter.
According to the third example, since the rear rim cleaning is continuously performed after the front rim cleaning, the rim cleaning can be easily controlled. Since the tank water supply is prioritized over the rear rim cleaning, the tank water supply can be reliably performed.

Next, a flush toilet according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 9 is a time chart showing the basic operation of the flush toilet according to the third embodiment of the present invention. FIGS. 10 and 11 show the siphon action and the jet water discharge state by the flush toilet according to the third embodiment of the present invention. It is a figure for demonstrating.
Since the structure of the flush toilet in the third embodiment is the same as that of the flush toilet shown in FIGS. 3 and 7, the basic operation of the flush toilet having the structure of FIG. Will be described.

As shown in FIG. 9, first, in the standby state (time t0 to t1), the switching valve 28 is in a neutral position communicating with both the rim side water supply path 18a and the tank side water supply path 32a. Next, when a toilet flushing switch (not shown) is operated (time t1) in this standby state (time t0 to t1), front rim water discharge (time t1 to t11) is started. At this time, first, the switching valve 28 is in a fully open state (tank side fully open position) in the tank side water supply channel 32a between times t2 and t3.
At the same time (time t <b> 2), the electromagnetic valve 22 is turned on, and the cleaning water flows into the water supply channel 19. Thereby, the air remaining in the water supply channel 19 on the upstream side of the switching valve 28 can be discharged into the water storage tank 32. As a result, it is possible to prevent the generation of air discharge sound from the rim water spouting port 18 that occurs when the switching valve 28 is suddenly switched to the rim-side water supply path 18a that is the rim side.

  Next, during time t3 to t4, the switching valve 28 is switched from the tank side fully open position to the rim side fully open position, the cleaning water is supplied to the rim water spouting port 18, and the cleaning water is discharged from the rim water spouting port 18.

  Next, after a predetermined time (for example, 5 seconds) has elapsed from time t2, between time t5 and t11, in order to perform jet water discharge, the pressure pump 34 is turned on, and the pressure pump 34 is stored in the water storage tank 32. The cleaning water is supplied to the jet water outlet 16 and the cleaning water is discharged from the jet water outlet 16.

  Here, at the time t5, when the jet water discharge is started by the pressurizing pump 34, the rim water discharge is continuously performed. Furthermore, this rim water discharge is continuously performed without interruption from the start to the end of the jet water discharge (between times t5 and t11).

  In the present embodiment, when the jet water discharge is started, the rim water discharge is continuously performed, that is, the jet water in the state where the accumulated water level in the bowl portion 12 and the drain trap conduit 14 is raised by the rim water discharge. Since water is discharged, the siphon action can be activated in a short time, and a strong siphon action can be generated. As a result, it is possible to reduce the amount of jet water discharged for starting siphon action, so that water saving can be achieved.

  In the present embodiment, since the rim water discharge is continuously performed without interruption from the start to the end of the jet water discharge (between times t5 and t11), air is thereby introduced into the inlet portion of the drain trap pipe. It becomes difficult to flow in, and siphon sound can be suppressed. Further, by discharging water while collecting floating filth at the center of the stored water, it is possible to prevent the floating filth from sticking to the bowl surface, and the floating filth can be discharged reliably.

Next, at the time of jet water discharge, the controller 40 controls the rotation speed of the pressurizing pump 34 as follows.
First, the pressurizing pump 34 is held at a relatively low speed (for example, 1000 rpm) from time t6 to t7, and thereby, in the vicinity of the top portion 44 of the cleaning water pipe 34b (that is, above the water surface of the bowl portion 12). The air staying in the (positioned portion) is slowly discharged from the jet spout 16. As a result, it is possible to prevent the generation of the sound of discharging air from the jet water spouting port 16 that occurs when the pressurizing pump 34 is suddenly started at a high speed.

  Next, at time t8 to t9, the pressurizing pump 34 is rotated at a high speed (for example, 3500 rpm). As a result, the pressure applied by the pressurizing pump 34 is increased, and a large amount of washing water is discharged from the jet water outlet 16. At this time, since the rim water spouting is continuously performed from the rim water spouting port 18, the flow rate of the cleaning water discharged from the rim water spouting port 18 is added, and the large amount of the washing water flows into the inlet portion 14 a of the drain trap pipe 14. The siphon phenomenon is rapidly caused, and the accumulated water and dirt in the bowl portion 12 are quickly discharged. At this time, the flow rate flowing into the inlet portion 14a of the drain trap pipe 14 is 75 liters in total of the flow rate due to rim water discharge (10 liters / minute to 15 liters / minute) and the flow rate due to jet water discharge (first flow rate). / Minute to less than 120 liters / minute, which is a larger flow rate than in the past.

  Next, at time t9 to t11, in order to set the flow rate (second flow rate) of the cleaning water flowing into the inlet 14a of the drain trap pipe 14 to be smaller than the above flow rate (first flow rate). The rotational speed of the pressure pump 34 is slightly reduced. In the example of FIG. 9, the rotational speed of the pressurizing pump 34 is decelerated in two stages (for example, 3300 rpm and 3200 rpm) in order to allow the second flow rate to flow into the inlet portion 14 a of the drain trap pipe 14. ing. At this time, the rotation speed of the pressurizing pump 34 may be one stage without being changed, or may be decelerated to three stages or more.

  Thus, in this embodiment, immediately before the siphon phenomenon generated by the first flow rate ends (time t9), the second flow rate that is less than the first flow rate at the inlet portion 14a of the drain trap pipe 14 is obtained. Of washing water.

  In the third embodiment, the second flow rate is a flow rate necessary to generate a flow velocity at which at least the filth in the bowl portion 12 can be carried over the top portion 14d of the drain trap pipe 14, and the bowl portion 12 The flow rate can be adjusted within the range in which filth can be carried out from By making the second flow rate smaller than the first flow rate, the filth floating in the bowl portion 12 is discharged with a small flow rate, so that water can be saved and water discharged from the jet spout 16 is discharged. There is also an effect that the sound can be reduced by lowering the sound. Furthermore, the inertial force of the pressurizing pump 34 is reduced by lowering the pump rotation speed of the pressurizing pump 34, and less washing water is sucked from the water storage tank 32 by the inertial force of the pressurizing pump 34. Even if the water storage tank 32 is downsized, it is possible to prevent the pressurizing pump 34 from sucking air and performing a so-called air biting operation.

  In the third embodiment, the first pattern, the second pattern, and / or the third pattern can be executed by adjusting the second flow rate to various values.

  That is, first, the first pattern is in the same state as in FIG. 5E and FIG. 6 shown in the first embodiment described above, and the flow rate (second flow rate) of the wash water flowing to the drain trap pipe 14. Creates a flow rate at which waste can be conveyed and seals the cross section of any part of the drain trap pipe 14 so that the drain trap pipe 14 is almost full so that the siphon action can be continued. It has become. At this time, the rotation speed of the pressurizing pump 34 for generating the second flow rate at time t9 to t11 in FIG. 9 is one stage of 3300 rpm (time t9 to t11). As shown in FIG. 9, at time t9 to T11, two stages of 3300 rpm (time t9 to t10) (corresponding to the state of the first pattern) and 3200 rpm (time t10 to t11) (second pattern to be described later) It is also possible to correspond.

  Next, in the second pattern, the state becomes as shown in FIG. 10E described later, and the flow rate (second flow rate) of the wash water flowing into the drain trap pipe 14 generates a flow rate at which the filth can be conveyed, and Although the siphon action has disappeared, the cross section of any part of the drain trap pipe 14 can be sealed. At this time, the rotation speed of the pressurizing pump 34 for generating the second flow rate at time t9 to t11 in FIG. 9 is one stage of 2800 rpm (time t9 to t11). As shown in FIG. 9, at time t9 to T11, two-stage 2800 rpm (time t9 to t10) (corresponding to the state of the second pattern) and 2600 rpm (time t10 to t11) (third pattern to be described later) It is also possible to correspond.

  In the second pattern, at times t8 to t9 in FIG. 9, the number of rotations of the pressurizing pump 34 for generating the first flow rate for causing the siphon phenomenon is lowered to, for example, 2800 rpm, and the cleaning water used. The amount of can also be reduced. In this case, after time t9, the flow rate (second pattern) is such that the cross section of any part of the drain trap pipe 14 is sealed. Even at such a low rotational speed, a siphon phenomenon can be caused. However, since the pulling power of filth by siphon is weak, it is preferable to use it corresponding to cleaning after small use.

  Further, in the third pattern, a state shown in FIG. 11E described later is obtained, and the flow rate of the cleaning water (second flow rate) flowing into the drain trap pipe 14 generates a flow rate at which filth can be conveyed and drained. The cross section of the trap pipe 14 is not sealed. At this time, the rotation speed of the pressurizing pump 34 for generating the second flow rate at time t9 to t11 in FIG. 9 is one stage of 2600 rpm (time t9 to t11).

  Next, when the water level of the washing water in the water storage tank 32 decreases and the lower end float switch 32c is turned on at time t11, the operation of the pressurizing pump 34 is stopped. At this time, the rotation speed of the pressurizing pump 34 is slowly reduced from time t11 to time t12 so that water discharged from the jet water outlet 16 gradually decreases. As a result, it is possible to prevent the occurrence of a siphon-breaking sound that occurs due to a sudden interruption of the siphon action (particularly, the first pattern).

At time t11, jet water spouting is completed, but at this time, rim water spouting is still continued, and rim water spouting (rear rim water spouting) is continued for a predetermined time (for example, 4 seconds) from time t11 to time t13. .
Thereafter, at time t13 to t14, the switching valve 28 is switched from the rim side full open to the tank side full open. As a result, the wash water is stored in the water storage tank 32.
Next, at time t15, when the water level in the water storage tank 32 rises, the upper end float switch 32b is turned on, whereby the electromagnetic valve 22 is turned off (closed operation), and the washing water enters the water storage tank 32. Inflow is stopped.

  Next, at time t16, the switching valve 28 returns to the neutral position communicating with both the rim side and the tank side, and returns to the standby state (the same state as time t0).

Next, the second pattern when the second flow rate described above is caused to flow into the inlet portion 14a of the drain trap pipe 14 will be described with reference to FIG.
In this second pattern, the number of rotations of the pressurizing pump 34 during the time t9 to t11 in FIG. 9 is reduced as compared with the first pattern, and the washing water is jetted from the jet spout 16 and the rim is removed. A flow rate due to water discharge is added, and the second flow rate is caused to flow into the inlet portion 14a of the drain trap pipe 14.

Of the states of FIGS. 10A to 10H in the second pattern, only the states of FIGS. 10E and 10F are the states of FIGS. 5E and 5F in the first pattern. Unlike others, the others are the same.
That is, in the second pattern, at time t9 to t10 in FIG. 9, even if air is sucked into the drain trap pipe 14 as shown in FIG. Since the cleaning water of a flow rate is continuously discharged, the jet water discharge seals the cross section of the inlet portion 14 a of the drain trap pipe 14. In the second pattern, since the supply flow rate is slightly reduced compared to the first pattern, air enters the drain trap pipe 14 from the drain pipe D side, and at this time, the siphon action ends.

  In this way, in the second pattern, since any part (inlet part 14a or the like) of the drain trap pipe 14 is sealed, the inlet part of the drain trap pipe 14 is terminated even if the siphon action is finished. As a result, a large amount of air is not sucked in from the block 14a, and as a result, when the accumulated water in the bowl portion 12 is discharged by siphon action, a large amount of air is sucked from the inlet portion 14a of the drain trap pipe 14 The generated siphon sound at the end of the siphon action can be suppressed, and the odor return from the drain pipe D can be prevented. Further, since a relatively large amount of jet water is discharged from the jet water outlet 16, the washing water can get over the top 14 d of the drain trap pipe 14, and as a result, the filth floating in the bowl portion is drained. It can be discharged from the trap line 14.

Next, a third pattern in the case where the second flow rate described above is caused to flow into the inlet portion 14a of the drain trap pipe 14 will be described with reference to FIG.
In the third pattern, the number of rotations of the pressurizing pump 34 during the time t9 to t11 in FIG. 9 is further reduced as compared with the second pattern, and cleaning water is jetted from the jet spouting port 16. The flow rate by the rim water discharge is added, and the second flow rate is caused to flow into the inlet portion 14 a of the drain trap pipe 14.

  Among the states of FIGS. 11A to 11H in the third pattern, only the states of FIGS. 11E and 11F are the states of FIGS. 5E and 5F in the first pattern. The other is the same.

  That is, in the third pattern, as shown in FIG. 11 (d), air is sucked into the drain trap pipe at time t9 to t10 in FIG. Since a relatively large flow of washing water is discharged from the water port 16, the opening area of the inlet portion 14a of the drain trap pipe 14 can be reduced by the flow of the washing water, and a large amount of air is sucked from there. As a result, when the accumulated water in the bowl part 12 is discharged by the siphoning action, the siphoning sound at the end of the siphoning action caused by sucking a large amount of air from the inlet part 14a of the drain trap pipe 14 is suppressed. Moreover, the return of odor from the drain pipe D to the inlet portion 14a of the drain trap pipe 14 can be suppressed. Further, the washing water can get over the top 14 d of the drain trap pipe 14, and as a result, the filth floating in the bowl part can be discharged from the drain trap pipe 14.

  Next, referring to FIG. 12, a flush toilet according to a fourth embodiment of the present invention will be described. FIG. 12 is a time chart showing changes in the rotation speed of the pressurizing pump in the flush toilet according to the fourth embodiment of the present invention. In this 4th Embodiment, only the rotation speed of the pressurization pump 34 in t9-t11 of FIG. 9 regarding the 3rd Embodiment mentioned above differs, and the other part is the same as 3rd Embodiment. .

  In the fourth embodiment, as shown in FIG. 12, at the time t7, the rotation speed of the pressurizing pump 34 is increased to 3500 rpm, and the siphon action is suddenly generated. Next, at the time t9, the pressurization is performed. The number of rotations of the pump 34 is reduced from 3500 rpm to 2600 rpm (the jet water discharge state at times t9 to t10 is the same as the third pattern described above). By reducing the rotational speed in this way, it is possible to save water by reducing the instantaneous water discharge amount. Then, at time t10, the rotation speed of the pressurizing pump 34 is increased to 3300 rpm (the jet water discharge state at times t10 to t101 is the same as the first pattern described above). In this way, by increasing the jet water discharge amount to a strong blow area, the filth (especially the filth that has floated in the remaining water after the occurrence of the siphon) is discharged from the trap ascending pipe 14b, thereby improving the cleaning ability. Can do.

  In the above-described embodiment, the pressurizing pump 34 that adjusts the flow rate by changing the number of rotations thereof is used. It can also be used in combination. In this example, the water storage tank is constituted by a pressure accumulating tank, and the flow rate of the wash water pressurized and supplied by the pressure accumulating tank can be controlled by a proportional solenoid valve type flow control valve to discharge water from the jet water outlet.

Next, referring to FIGS. 13 and 14, a flush toilet according to a fifth embodiment of the present invention will be described.
FIG. 13 is an overall configuration diagram showing a flush toilet according to the fifth embodiment of the present invention, and FIG. 14 is a time chart showing a basic operation of the flush toilet according to the fifth embodiment of the present invention.
In addition, since the basic structure of the flush toilet of 5th Embodiment is the same as what is shown in FIG.1 and FIG.3, the description is abbreviate | omitted.

Here, the functional unit 10 of the flush toilet 1 according to the present embodiment will be described in detail with reference to FIG.
As shown in FIG. 13, the functional unit 10 is provided with a water supply channel 124 to which cleaning water is supplied from the water supply. A constant flow valve 132 and a diaphragm type electromagnetic on-off valve 134 are provided.

The constant flow valve 132, the electromagnetic on-off valve 134, and vacuum breakers 142 and 148 described later are integrally assembled as a valve unit 137 as described later.
Further, the downstream side 124 a of the water supply channel 124 is connected to the water storage tank 120 so as to supply cleaning water to the water storage tank 120.

  Here, the constant flow valve 132 is for restricting the wash water flowing in through the stop cock 126, the strainer 128, and the branch fitting 130 to a predetermined flow rate or less. The wash water that has passed through the constant flow valve 132 flows into the electromagnetic on-off valve 134, and the wash water that has passed through the electromagnetic on-off valve 134 is supplied to the water storage tank 120 through the water supply passage 124.

  A pump-side water supply path 145 is connected to the lower part of the water storage tank 120, and a pressure pump 122 having a pump chamber 122 a is connected to the downstream end of the pump-side water supply path 145. Further, the pressurization pump 122 and the jet spout 16 are connected by a jet-side water supply path 146 so that the pressurization pump 122 pressurizes the cleaning water stored in the water storage tank 120 and supplies it to the jet spout 116. It has become.

  As shown in FIG. 3, the jet-side water supply channel 146 is formed in a convex shape upward, and the top portion 146a of the convex portion is at the highest position.

  A water supply path switching valve 136 is attached to the jet side water supply path 146. Further, the water supply channel switching valve 136 is provided with a rim-side water supply channel 138 for supplying cleaning water to the rim water spouting port 18 so as to branch from the jet-side water supply channel 146. This water supply path switching valve 136 can supply cleaning water to both the rim side water supply path 138 and the jet side water supply path 146 at the same timing, and can arbitrarily change the ratio of the water supply amount to the rim side and the tank side. It is a switching valve.

  Next, a rim water discharge vacuum breaker 148 is provided in the rim-side water supply path 138 described above, and when negative pressure is generated upstream of the water supply path switching valve 136, the reverse flow of the cleaning water from the rim water discharge port 18 is achieved. Is preventing. Further, as shown in FIG. 3, the rim water discharge vacuum breaker 148 is disposed above the upper end surface of the bowl portion 12, thereby reliably preventing backflow. Further, the wash water overflowing from the air release portion of the rim water discharge vacuum breaker 148 flows into the water storage tank 120 through the return pipe 150.

  The water supply passage 124 is also provided with a vacuum breaker 142 as a check valve to prevent the backflow of the wash water from the water storage tank 120.

  Here, the water storage tank 120 is a sealed type water storage tank, and a ball type check valve 143 is provided at a connection portion between the downstream side 24 a of the water supply path 24 and the water storage tank 120. The ball type check valve 143 causes the ball 143a to float up and connect the connection to the water supply channel 24 even when the water storage tank 120 is filled with water after exceeding the position of the upper end 170a of the overflow channel 170 described later. Since it is closed, the washing water does not flow back to the water supply channel 24.

  Similarly, a ball type check valve 144 is similarly provided at the connection portion between the return pipe 150 and the water storage tank 120, and the water storage tank 120 extends beyond the position of the upper end 170 a of the overflow channel 170 described later. Even when the water is full, the washing water does not flow back to the return pipe 150.

  Further, the pump-side water supply path 145 is provided with a jet water spouting flapper valve 156 and a water drain plug 158 which are check valves. The jet water spouting flapper valve 156 and the water drain plug 158 are disposed below the pressurizing pump 122 and at a height near the lower end of the water storage tank 120. For this reason, by opening the water drain plug 158, the cleaning water in the water storage tank 120 and the pressure pump 122 can be discharged during maintenance or the like. Further, by disposing the jet water spouting flapper valve 156 between the water storage tank 120 and the pressurizing pump 122, when the water level in the water storage tank 120 becomes lower than the height of the pressurizing pump 122, the washing water is added. The pressure pump 122 flows back to the water storage tank 120 to prevent the washing water in the pressure pump 122 from escaping and the pressure pump 122 from idling. Further, a water receiving tray 160 is disposed below the pressurizing pump 122 so as to receive condensed water droplets and water leakage.

  The function unit 10 includes a controller 162 that controls the opening / closing operation of the electromagnetic opening / closing valve 134, the switching operation of the water supply channel switching valve 136, and the rotation speed and operating time of the pressurizing pump 122.

Inside the water storage tank 120, an upper end float switch 164a and a lower end float switch 164b are arranged.
The upper end float switch 164a is turned on when the water level in the water storage tank 120 reaches a predetermined position L2 that is slightly lower than the highest water level L1 during normal use, and the controller 162 detects this and closes the electromagnetic on-off valve 134. .

  The lower end float switch 164b is turned on when the water level in the water storage tank 120 falls to a predetermined water level L3 that is slightly higher than the lowest water level L4 during normal use, and the controller 162 detects this and stops the pressurizing pump 122. Let

  Furthermore, an overflow channel 170 is provided, and an upper end 170 a of the overflow channel 170 opens into the water storage tank 120, and a lower end 170 b of the overflow channel 170 is connected to the jet-side water supply channel 146.

  A flapper valve 172 as a check valve is attached to the overflow channel 170. The overflow flow path 170 and the flapper valve 172 prevent back flow from the jet water outlet 16 of the washing water, and can perform edge cutting between them.

  The controller 162 sequentially operates the electromagnetic on-off valve 134, the pressurizing pump 22, and the water supply path switching valve 136 by turning on a cleaning switch (not shown) by the user, and first discharges water from the rim water spouting port 18. While continuing the water discharge, the water discharge from the jet water discharge port 16 is then started to wash the bowl portion 12. Further, the controller 162 continues to open the electromagnetic on-off valve 134 even after the end of cleaning, and replenishes the storage tank 120 with cleaning water. When the water level in the water storage tank 120 rises and the upper end float switch 164a detects the specified water storage amount, the controller 62 closes the electromagnetic on-off valve 34 and stops water supply.

Next, the basic operation of the flush toilet of the fifth embodiment will be described with reference to FIG.
As shown in FIG. 14, first, in the standby state (time t0 to t1), the water supply path switching valve 136 is in a fully open position on the rim side that communicates only with the rim side water supply path 138 (100% on the rim side and 0% on the jet side). Position). Next, in this standby state (time t0 to t1), when the toilet flushing switch (not shown) is turned on (time t1), the electromagnetic on / off valve 134 is opened (ON) to wash water into the storage tank 120. And the pressurizing pump 122 is started (turned ON) to increase the rotational speed to a low speed of 1000 rpm. At the same time, the water supply path switching valve 136 is switched from the fully open position on the rim side to the fully open position on the jet side (0% on the rim side and 100% on the jet side).

Next, during time t2 to t3, the water supply path switching valve 136 is held at the jet side fully open position, and thereafter, gradually between time t3 and t4, the water supply switching valve 136 is gradually opened from the jet side fully opened position. The position is switched to the position, and washing water is discharged from the rim water spouting port 18.
Thus, since the water supply path switching valve 136 is switched from the rim fully open position to the one end jet side fully open position and then switched to the rim fully open position, the air remaining in the tank side water supply path 145 16 can be discharged. As a result, it is possible to prevent the generation of discharge sound generated at the rim water spouting port 18 when the air in the tank side water supply channel 145 is suddenly discharged from the rim side.

  In this way, rim cleaning is performed between time t1 and time t5 (for example, for 5 seconds). Next, between time t5 and time t6, the water supply path switching valve 136 is gradually switched from the fully open position on the rim side to the open position on both sides communicating with both the rim side and the jet side. Thereafter, at time t6, the pressure pump 122 is rotated at a high speed (for example, 3500 rpm), and jet water spouting is started.

  Here, at the time t6, when the jet water discharge is started by the pressurizing pump 122, the rim water discharge is continuously performed. Furthermore, this rim water discharge is continuously performed without interruption from the start to the end of the jet water discharge (between times t5 and t10).

  In the present embodiment, when the jet water discharge is started, the rim water discharge is continuously performed, that is, the jet water in the state where the accumulated water level in the bowl portion 12 and the drain trap conduit 14 is raised by the rim water discharge. Since water is discharged, the siphon action can be activated in a short time, and a strong siphon action can be generated. As a result, it is possible to reduce the amount of jet water discharged to activate the siphon action, thereby achieving water saving.

  Further, in the present embodiment, since the rim water discharge is continuously performed without interruption from the start to the end of the jet water discharge (between times t6 and t10), air is thereby introduced to the inlet portion of the drain trap pipe. It becomes difficult to flow in, and siphon sound can be suppressed. Further, by discharging water while collecting floating filth at the center of the stored water, it is possible to prevent the floating filth from sticking to the bowl surface, and the floating filth can be discharged reliably.

Next, at the time of jet water discharge, the controller 162 controls the rotation speed of the pressurizing pump 122 as follows.
First, during the time t5 to t6 before jet water discharge, when the water supply path switching valve 136 switches from the rim-side fully open position to the both-side open position, the pressure pump 122 is held at a relatively low speed (for example, 1000 rpm). Thereby, the air staying in the vicinity of the top portion 146a of the jet-side water supply channel 146 (that is, the portion located above the water storage surface of the bowl portion 12) is slowly discharged from the jet water outlet 16. As a result, it is possible to prevent the generation of air discharge sound from the jet water spouting port 16 that is generated when the pressurizing pump 122 is suddenly started at a high speed.

  Next, at time t7 to t8, the pressurizing pump 122 is rotated at a high speed (for example, 3500 rpm). Thereby, the pressurizing force by the pressurizing pump 122 is increased, and a large amount of washing water is discharged from the jet water discharge port 16. At this time, since the rim water spouting is continuously performed from the rim water spouting port 18, the flow rate of the cleaning water discharged from the rim water spouting port 18 is added, and the large amount of the washing water flows into the inlet portion 14 a of the drain trap pipe 14. The siphon phenomenon is rapidly caused, and the accumulated water and dirt in the bowl portion 12 are quickly discharged. At this time, the flow rate (first flow rate) flowing into the inlet portion 14a of the drain trap pipe 14 is 75 liters / minute to 120 liters / minute, which is the sum of the flow rate due to the rim water discharge and the flow rate due to the jet water discharge. The flow rate is larger than that.

  Next, in order to set the flow rate (second flow rate) of the cleaning water flowing into the inlet portion 14a of the drain trap pipe 14 at time t8 to t9 to be smaller than the above flow rate (first flow rate). The rotational speed of the pressure pump 34 is slightly reduced. In the example of FIG. 14, the rotational speed of the pressurizing pump 122 is decelerated in two stages (for example, 3300 rpm and 3200 rpm) in order to allow the second flow rate to flow into the inlet portion 14 a of the drain trap pipe 14. ing. At this time, the rotation speed of the pressurizing pump 122 may be one stage without being changed, or may be decelerated to three stages or more.

  Thus, in this embodiment, immediately before the siphon phenomenon generated by the first flow rate ends (time t8), the second flow rate that is smaller than the first flow rate at the inlet portion 14a of the drain trap pipe 14 is obtained. Of washing water.

  Also in the fifth embodiment, the second flow rate is a flow rate necessary to generate a flow velocity at which at least the filth in the bowl portion 12 can be carried out beyond the top portion 14d of the drain trap pipe 14, and the third flow rate described above. Similar to the embodiment, the flow rate can be adjusted within a range in which the filth can be carried out from the bowl portion 12. By making the second flow rate smaller than the first flow rate, the filth floating in the bowl portion 12 is discharged with a small flow rate, so that water can be saved and water discharged from the jet spout 16 is discharged. There is also an effect that the sound can be reduced by lowering the sound. Furthermore, since the inertial force of the pressurizing pump 122 is reduced by lowering the pump rotation speed of the pressurizing pump 122, less washing water is sucked from the water storage tank 120 by the inertial force of the pressurizing pump 122. Even if the water storage tank 120 is downsized, it is possible to prevent the pressurizing pump 122 from sucking air and performing a so-called air biting operation.

  In the fifth embodiment, similar to the above-described third embodiment, the same first pattern, second pattern, and / or third pattern can be obtained by adjusting the second flow rate to various values. Can be executed.

  Next, at time t10 when a predetermined time (for example, 3 seconds) has elapsed from time t5, the pressure pump 122 is rotated at a low speed (for example, 1000 rpm). At the same time, the water supply channel switching valve 139 is switched from the open position on both sides to the fully open position on the rim side. The number of rotations of the pressurizing pump 122 is slowly decreased from time t10 to time t11 so that water discharged from the jet water discharge port 16 gradually decreases. As a result, it is possible to prevent the occurrence of a siphon-breaking sound that occurs due to a sudden interruption of the siphon action (particularly, the first pattern).

At time t <b> 11, the jet water discharge is finished, but at this time, the rim water discharge is still continued.
Next, when the water level of the wash water in the water storage tank 120 drops to the water level L3 at time t12 and the lower end float switch 164b is turned on, the operation of the pressurizing pump 122 is stopped.
After this time t12, the pressurizing pump 122 is in a stopped state, but the electromagnetic on-off valve 134 is still open, so that the washing water is replenished into the water storage tank 120 after the time t12 (tank water supply). It has become.

  Next, when the water level in the water storage tank 120 rises at time t14, the upper end float switch 164a is turned ON, and at time t15, the electromagnetic on-off valve 134 is turned OFF (closing operation) and the water tank for washing water is stored. Inflow into 32 is stopped.

  At this time t15, the water supply channel switching valve 136 is in the fully open position on the rim side, and returns to the standby state (the same state as the time t0).

DESCRIPTION OF SYMBOLS 1 Flush toilet 2 Toilet bowl main body 10 Function part 12 Bowl part 14 Drain trap pipe 14a Inlet part 14b Trap rise pipe 14c Trap down pipe 14d Top part 16 Jet water outlet 18 Rim water outlet 18a, 138 Rim side water supply path 20,132 Flow valve 22,134 Solenoid valve (electromagnetic on-off valve)
23 Solenoid valve for rim water discharge 25 Solenoid valve for tank water supply 28,136 Switching valve (Water supply path switching valve)
32, 120 Water storage tank 32a Tank water supply path 32b, 164a Upper end float switch 32c, 164b Lower end float switch 34, 122 Pressure pump 34a, 145 Washing water pipe (pump side water supply path)
34b, 146 Washing water pipeline (jet side water supply channel)
40,162 controller

Claims (1)

A flush toilet flushed with pressurized flush water,
A toilet body including a bowl portion, a rim spout and a jet spout for discharging washing water, and a drain trap conduit;
A water storage tank for storing cleaning water;
A pressurizing pump for pressurizing the wash water stored in the water storage tank;
A rim water spouting supply means for supplying the cleaning water pressurized by the pressure pump to the rim water spouting port at a predetermined timing;
Jet water supply means for supplying the cleaning water pressurized by the pressure pump to the jet water outlet at a predetermined timing;
Control means for controlling the rim water spouting supply means, the pressure pump and the jet water spouting supply means to discharge the wash water to the bowl portion of the toilet body,
The control means first discharges wash water from the rim spout, and then continues the discharge of the wash water from the rim spout while the first flow rate causing the siphon action to be generated from the jet spout. A flush toilet characterized by controlling the rim water spouting means, the pressurizing pump and the jet water spouting means to discharge water.

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