Flush toilet bowl device

Abstract

To provide a flush toilet bowl device that prevents flush water from continuing to be discharged from a flush water tank for a long period of time, thereby suppressing wasted water.SOLUTION: A flush toilet bowl device 1 that flushes using flush water stored in a flush water tank 4 comprises a toilet body 2, a flush water tank 4 that stores flush water, a water supply valve 14 that supplies flush water into this flush water tank 4, a first drain valve 10 that opens and closes the first drain outlet 4b, a second drain valve 12 that opens and closes the second drain outlet 4c, and a lever handle 4a that pulls up either the first drain valve 10 or the second drain valve 12. The supply flow rate of flush water that is supplied from the water supply valve 14 into the flush water tank 4 is set to be different from each of the first drain flow rate of flush water discharged out of the flush water tank 4 from the first drain valve 10, and the second drain flow rate of flush water discharged from the second drain valve 12.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a flush toilet apparatus, and more particularly to a flush toilet apparatus that flushes with flush water stored in a flush water tank. [Background technology]

[0002] As described in Patent Document 1, a known flush toilet apparatus has been provided in a flush water tank with a water pressure drive mechanism that is driven by the water supply pressure of flush water supplied from a water line, and a drain valve that opens in conjunction with the drive of the water pressure drive mechanism. The water pressure drive mechanism comprises a cylinder and a piston that is located within the cylinder and moves in conjunction with the drain valve. The drain valve also comprises a clutch mechanism for connecting and disconnecting from the piston. With this configuration, when flush water is supplied to the water pressure drive mechanism, the flush water that flows into the cylinder pushes up the piston, lifting the drain valve. Furthermore, in a flush toilet apparatus, when the drain valve is raised to a predetermined height, the clutch mechanism disconnects the drain valve from the piston, allowing the drain valve to descend. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-193256 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in the flush toilet apparatus described in Patent Document 1 mentioned above, it is conceivable to provide a drain valve for rim spouting and a drain valve for jet spouting inside the flush water tank. The flow rate of flush water discharged from each of the drain valve for rim spouting and the drain valve for jet water spouting is set to be relatively small compared to when there is a single drain valve in the past. For this reason, when only one of the drain valves is raised, there are cases where the supply flow rate of flush water supplied from the water supply valve into the flush water tank and the drain flow rate of flush water discharged from the drain valve out of the flush water tank become equal (balanced). When the supply flow rate and the drain flow rate become equal, the drain valve does not close and flush water continues to be discharged from the flush water tank for a long period of time, posing the problem of wasted water.

[0005] Therefore, an object of the present invention is to provide a flush toilet apparatus that can prevent flush water from being continuously discharged from the flush water tank over an extended period of time, resulting in wasted water. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a flush toilet device that flushes using flush water stored in a flush water tank, comprising a toilet body with a bowl section and a drain trap pipe extending from below this bowl section, a flush water tank that is positioned behind this toilet body and stores flush water for flushing the bowl section of the toilet body, a water supply valve that supplies flush water into this flush water tank, and a first drain valve that opens and closes a first drain outlet provided in this flush water tank to switch between discharging and stopping flush water from a first spout provided in the bowl section. The flushing water dispenser has a water valve, a second drain valve that switches between discharging and stopping flushing water from a second water outlet provided in the bowl section by opening and closing a second drain outlet provided in the flushing water tank, and an operating section for pulling up either the first drain valve or the second drain valve, and is characterized in that the supply flow rate of flushing water supplied into the flushing water tank from the water supply valve is set to be different from each of the first drain flow rate of flushing water discharged out of the flushing water tank from the first drain valve and the second drain flow rate of flushing water discharged out of the flushing water tank 4 from the second drain valve.

[0007] According to the present invention configured in this manner, the supply flow rate of cleaning water supplied from the water supply valve into the cleaning water tank is set to be different from the first drain flow rate of cleaning water discharged out of the cleaning water tank from the first drain valve and the second drain flow rate of cleaning water discharged out of the cleaning water tank 4 from the second drain valve.Therefore, even if only one of the first or second drain valves is raised, the supply flow rate of cleaning water supplied from the water supply valve into the cleaning water tank and the drain flow rate of cleaning water discharged out of the cleaning water tank from the drain valve will not be equal (unbalanced), so cleaning water will continue to be discharged from the cleaning water tank for a long period of time, preventing the generation of wasted water.

[0008] In the present invention, the water supply flow rate is preferably set to be smaller than both the first drainage flow rate and the second drainage flow rate.

[0009] According to the present invention configured in this manner, the water supply flow rate is set to be smaller than both the first drainage flow rate and the second drainage flow rate, thereby preventing flush water from being continuously discharged from the flush water tank for a long period of time.

[0010] In the present invention, the difference between the water supply flow rate and each of the first and second drainage flow rates is preferably set to be 4 L / min or more.

[0011] According to the present invention configured in this manner, the difference between the water supply flow rate and each of the first and second drainage flow rates is set to be 4 L / min or more, so that the water supply flow rate of cleaning water supplied from the water supply valve into the cleaning water tank and the drainage flow rate of cleaning water discharged from the drain valve out of the cleaning water tank are not equal, thereby preventing cleaning water from being continuously discharged from the cleaning water tank for long periods of time.

[0012] In the present invention, the water supply valve preferably includes a constant flow valve that determines the water supply flow rate.

[0013] According to the present invention configured in this manner, the water supply valve is equipped with a constant flow valve that determines the water supply flow rate, so that the constant flow valve can adjust the water supply flow rate of the cleaning water supplied from the water supply valve into the cleaning water tank.

[0014] Also, in the present invention, the flush water tank preferably includes a partition wall that separates a first tank portion provided with a first drain outlet from a second tank portion provided with a second drain outlet.

[0015] According to the present invention configured in this manner, the flush water tank is provided with a partition wall that separates the first tank section, which has the first drain outlet, from the second tank section, which has the second drain outlet, thereby suppressing variations in the drainage flow rate of the flush water discharged out of the flush water tank from each drain outlet.

[0016] In the present invention, preferably, at least one of the first drain valve and the second drain valve includes a clutch mechanism that lifts the drain valve in response to operation of the operating portion and lowers the drain valve at a predetermined timing.

[0017] According to the present invention configured in this manner, at least one of the first drain valve and the second drain valve is equipped with a clutch mechanism that raises the drain valve in accordance with the operation of the operating part and lowers the drain valve at a predetermined timing, so that the drain valve can be lowered at a predetermined timing, thereby suppressing variations in the drainage flow rate of the cleaning water discharged from the drain outlet out of the cleaning water tank. [Effects of the Invention]

[0018] According to the flush toilet apparatus of the present invention, flush water continues to be discharged from the flush water tank over an extended period of time, thereby preventing the generation of wasted water. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a block diagram showing a flush toilet apparatus according to an embodiment of the present invention. [Figure 2]FIG. 1 is a cross-sectional view showing the general configuration of a flush water tank provided in a flush toilet apparatus according to an embodiment of the present invention. [Figure 3] FIG. 2 is a cross-sectional view showing the structure of a water pressure drive mechanism built into the flush water tank in a flush toilet apparatus according to an embodiment of the present invention. [Figure 4] FIG. 2 is a schematic diagram for explaining the operation of a flush toilet apparatus according to an embodiment of the present invention. [Figure 5] FIG. 2 is a schematic diagram for explaining the operation of a flush toilet apparatus according to an embodiment of the present invention. [Figure 6] FIG. 2 is a schematic diagram for explaining the operation of a flush toilet apparatus according to an embodiment of the present invention. [Figure 7] FIG. 2 is a schematic diagram for explaining the operation of a flush toilet apparatus according to an embodiment of the present invention. [Figure 8] FIG. 2 is a schematic diagram for explaining the operation of a flush toilet apparatus according to an embodiment of the present invention. [Figure 9] FIG. 2 is a schematic diagram for explaining the operation of a flush toilet apparatus according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] Next, a flush toilet apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a flush toilet apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the general configuration of a flush water tank provided in a flush toilet apparatus according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view showing the structure of a water pressure drive mechanism built into the flush water tank in a flush toilet apparatus according to an embodiment of the present invention.

[0021] As shown in Figure 1, a flush toilet apparatus 1 according to an embodiment of the present invention is made up of a toilet body 2, which is a flush toilet, and a flush water tank 4 located at the rear of this toilet body 2. The flush toilet apparatus 1 of this embodiment is configured so that flushing is performed by operating a lever handle 4a (operating part) provided on the flush water tank 4. As a modified example, the present invention can be configured so that cleaning is performed based on a control signal from an operation button on a remote control device (not shown) or a detection signal from a human presence sensor (not shown).

[0022] The toilet body 2 comprises a bowl portion 2a and a drain trap pipe 2c extending from the bottom of the bowl portion 2a. A rim water outlet 2d (first water outlet) is provided at the upper edge of the bowl portion 2a, and a jet water outlet 2e (second water outlet) is provided at the bottom of the bowl portion 2a. When flushing the toilet, flush water is discharged from the rim water outlet 2d and the jet water outlet 2e at a predetermined timing, cleaning the waste receiving surface of the bowl portion 2a and discharging the waste and flush water from within the bowl portion 2a into the drain trap pipe 2c. The waste and flush water discharged into the drain trap pipe 2c pass through a drain socket (not shown) and are discharged into the sewer pipe (not shown).

[0023] Flush water is supplied to the flush water tank 4 from a water supply source 6 such as a tap via a stop valve 8, and the supplied flush water is stored in the flush water tank 4 up to a predetermined water level. Stop valve 8 is provided to stop the supply of flush water to the flush water tank 4 during maintenance etc., and is normally left in the "open" position. In addition, first drain valve 10 and second drain valve 12 are built into the flush water tank 4, and are configured to open and close first drain outlet 4b and second drain outlet 4c, respectively, which are provided at the bottom of the flush water tank 4.

[0024] Flush water that flows out from the first drain outlet 4b passes through the rim water conduit 2f formed inside the toilet body 2, and is discharged from the rim water spout 2d. Therefore, the first drain valve 10 switches between turning on and off the discharge of flush water from the rim water spout 2d by opening and closing the first drain outlet 4b provided in the flush water tank 4. Also, flush water that flows out from the second drain outlet 4c passes through the jet water conduit 2g formed inside the toilet body 2, and is discharged from the jet water spout 2e. Therefore, the second drain valve 12 switches between turning on and off the discharge of flush water from the jet water spout 2e by opening and closing the second drain outlet 4c provided in the flush water tank 4.

[0025] In a flush toilet apparatus 1 according to an embodiment of the present invention, flush water flows out of the first drain outlet 4b at a drainage flow rate (first drainage flow rate) of approximately 10.5 to 12 L / min, preferably approximately 10 L / min. Furthermore, flush water discharged from the second drain outlet 4c flows out at a drainage flow rate (second drainage flow rate) of approximately 80 L / min. Therefore, the drainage flow rate of flush water flowing out of the flush water tank 4 from the first drain outlet 4b is relatively small compared to the drainage flow rate of flush water discharged out of the flush water tank 4 from the second drain outlet 4c.

[0026] Next, the internal structure of the flush water tank 4 will be described with reference to FIG. As shown in Figure 2, the flush water tank 4 has a first drain valve 10 that opens and closes the first drain outlet 4b, a second drain valve 12 that opens and closes the second drain outlet 4c, a water supply valve 14, and a water hydraulic drive mechanism 16.

[0027] The flush water tank 4 is a tank configured to store flush water to be supplied to the toilet body 2, and is formed at its bottom with a first drain outlet 4b and a second drain outlet 4c for discharging the stored flush water into the toilet body 2 and out of the flush water tank 4. Furthermore, a partition wall 5 is provided inside the flush water tank 4, which separates the flush water tank 4 into a first tank section 5a with the first drain outlet 4b, and a second tank section 5b with the first drain outlet 4b. Furthermore, a small hole 5c is provided at a predetermined height position in the partition wall 5, and this small hole 5c connects the first tank section 5a and the second tank section 5b at a predetermined water level.

[0028] The first drain valve 10 is a valve body arranged to open and close the first drain outlet 4b, and the first drain outlet 4b is opened when the first drain valve 10 is pulled upward. This causes flush water in the first tank section 5a of the flush water tank 4 to be discharged into the rim water conduit 2f of the toilet body 2 and then ejected from the rim spout 2d.

[0029] In this embodiment, when the user rotates lever handle 4a provided on flush water tank 4 in one direction, ball chain 10a connected to first drain valve 10 is pulled, and first drain valve 10 is pulled up. In this embodiment, first drain valve 10 is a valve body equipped with float ball 10b, and after being pulled up from first drain port 4b and opened, it gradually drops as the water level in first tank section 5a drops, and is configured to close when the water level drops to a predetermined level.

[0030] The second drain valve 12 is a valve body arranged to open and close the second drain outlet 4c, and the second drain outlet 4c is opened by pulling the second drain valve 12 upward. This causes flush water in the second tank section 5b of the flush water tank 4 to be discharged into the jet water conduit 2g of the toilet body 2 and sprayed from the jet water outlet 2e.

[0031] In this embodiment, the second drain valve 12 is configured to be pulled up from the second drain port 4c by the water hydraulic drive mechanism 16. The second drain valve 12 is a valve body including a valve stem 12a extending upward and a float ball 12b, and the valve stem 12a is pulled up by the water hydraulic drive mechanism 16. Then, when the second drain valve 12 is pulled up to a predetermined height, it is disconnected from the water hydraulic drive mechanism 16 and gently descends as the water level in the second tank portion 5b drops, closing the second drain port 4c.

[0032] In addition, in this embodiment, the float ball 12b of the second drain valve 12 is attached at a higher position than the float ball 10b of the first drain valve 10, so it seats on the second drain outlet 4c and closes it when the water level in the second tank portion 5b is relatively high. In other words, even if the water levels in the first tank portion 5a and the second tank portion 5b drop while maintaining the same water level, the second drain valve 12 seats on the second drain outlet 4c and closes it before the first drain valve 10.

[0033] In this embodiment, when the user rotates the lever handle 4a in one direction, the first drain valve 10 is pulled up, and the second drain valve 12 is pulled up by the hydraulic drive mechanism 16. However, without providing the hydraulic drive mechanism 16, it is also possible to configure the system so that when the user rotates the lever handle in one direction, one drain valve is pulled up, and when the user rotates the lever handle in the other direction, the other drain valve is pulled up.

[0034] The water supply valve 14 is configured so that cleaning water supplied from the water supply source 6 flows in through the inlet pipe 14a, and in this embodiment, due to the action of this water supply valve 14, the second drain valve 12 opens later than the first drain valve 10.

[0035] The water supply valve 14 has a main body 18 to which the inlet pipe 14a and outlet pipe 14b are connected, a diaphragm-type main valve element 20 arranged within this main body 18, a valve seat 22 on which this main valve element 20 sits, an arm 26 that is rotated by a float 24, and a pilot valve 28 that is moved by the rotation of this arm 26. In other words, the water supply valve 14 is equipped with a float 24 that operates in conjunction with the water level in the flush water tank 4, and is configured to supply flush water to the water pressure drive mechanism 16 when the float 24 drops to a predetermined position.

[0036] A constant flow valve 14c is provided upstream of inflow pipe 14a to determine the flow rate of flush water supplied from water supply valve 14 into flush water tank 4. Constant flow valve 14c is designed to adjust the flow rate of flush water passing through the pipe. Constant flow valve 14c sets the flow rate of flush water supplied from water supply valve 14 into flush water tank 4 to approximately 5 to 7 L / min.

[0037] Next, the configuration of the water hydraulic drive mechanism 16 will be described with reference to FIG. The water hydraulic drive mechanism 16 is configured to drive the second drain valve 12 using the water supply pressure of flush water supplied from the water main to the flush water tank. Specifically, the water hydraulic drive mechanism 16 has a cylinder 16a into which water supplied from the water supply valve 14 flows, a piston 16b slidably disposed within the cylinder 16a, and a piston shaft 30 that protrudes from the bottom end of the cylinder 16a and drives the second drain valve 12. Furthermore, a spring 16c is disposed inside the cylinder 16a and urges the piston 16b downward, and a packing is attached to the piston 16b to ensure watertightness between the inner wall surface of the cylinder 16a and the piston 16b. Furthermore, a clutch mechanism 32 is provided at the bottom end of the piston shaft 30, and this clutch mechanism 32 connects and disconnects the piston shaft 30 and the valve shaft 12a of the second drain valve 12.

[0038] Cylinder 16a is a cylindrical member that is positioned with its axis oriented vertically and that slidably receives piston 16b inside. Furthermore, an outlet pipe 14b extending from water supply valve 14 is connected to the lower end of cylinder 16a, allowing flush water that flows out from water supply valve 14 to flow into cylinder 16a. As a result, piston 16b inside cylinder 16a is pushed up against the biasing force of spring 16c by the water that flows into cylinder 16a.

[0039] Meanwhile, an outflow hole is provided at the upper end of cylinder 16a, and water supply pipe 34 communicates with the interior of cylinder 16a via this outflow hole. Therefore, when water flows into cylinder 16a from outflow pipe 14b connected to the bottom of cylinder 16a, piston 16b is pushed upward from the bottom of cylinder 16a. Then, when piston 16b is pushed up to a position above the outflow hole, the water that has flowed into cylinder 16a flows out from the outflow hole into water supply pipe 34. Also, flush water that has flowed into water supply pipe 34 drops into second tank section 5b of flush water tank 4, supplying flush water to flush water tank 4.

[0040] The piston shaft 30 is a rod-shaped member connected to the underside of the piston 16b, and extends through a through-hole formed in the bottom surface of the cylinder 16a so as to protrude downward from within the cylinder 16a. The valve shaft 12a of the second drain valve 12 is connected to the lower end of the piston shaft 30 via a clutch mechanism 32, and the piston shaft 30 connects the piston 16b and the second drain valve 12. Therefore, when water flows into the cylinder 16a and pushes up the piston 16b, the piston shaft 30 connected to the piston 16b lifts up the second drain valve 12, and the second drain valve 12 opens.

[0041] Furthermore, a gap is provided between the piston shaft 30 protruding from below the cylinder 16a and the inner wall of the through-hole of the cylinder 16a, and some of the water that flows into the cylinder 16a flows out through this gap. The water that flows out through the gap flows into the second tank portion 5b. Note that because this gap is relatively narrow and has a large flow resistance, even if water flows out through the gap, the water flowing into the cylinder 16a from the outflow pipe 14b increases the pressure inside the cylinder 16a, and the piston 16b is pushed up against the biasing force of the spring 16c.

[0042] Furthermore, a clutch mechanism 32 detachably connects the piston shaft 30 and the second drain valve 12. When the second drain valve 12 is lifted up a predetermined distance together with the piston shaft 30, the clutch mechanism 32 is configured to disconnect the valve shaft 12a of the second drain valve 12 from the piston shaft 30. With the clutch mechanism 32 in a disengaged state, the second drain valve 12 is no longer linked to the movement of the piston 16b and the upper part of the piston shaft 30, and the second drain valve 12 descends as the water level in the second tank portion 5b of the flush water tank 4 drops.

[0043] Next, with new reference to Figures 4 to 9, the operation of the flush toilet apparatus 1 according to an embodiment of the present invention will be explained. 4 to 9 are schematic diagrams for explaining the operation of a flush toilet apparatus 1 according to an embodiment of the present invention.

[0044] First, in the initial state of toilet flushing as described above, as shown in Figure 2, the first drain outlet 4b and second drain outlet 4c of the flush water tank 4 are closed by the first drain valve 10 and second drain valve 12, respectively. Also, because the first tank section 5a and second tank section 5b of the flush water tank 4 are connected by the small hole 5c in the partition wall 5, in the initial state the water levels in the first tank section 5a and second tank section 5b are at the same initial water level L2.

[0045] Next, when the user rotates the lever handle 4a of the flush water tank 4 in one direction to flush the toilet, the connected ball chain 10a pulls up the first drain valve 10. This pulls the first drain valve 10 away from the first drain outlet 4b, opening the first drain outlet 4b, as shown in FIG. 4. When the first drain outlet 4b is opened, flush water that had been stored in the first tank portion 5a of the flush water tank 4 flows from the first drain outlet 4b into the rim water conduit 2f and is discharged from the rim spout 2d. The rim spouting from the rim spout 2d creates a swirling flow on the waste receiving surface of the bowl portion 2a, cleaning the waste receiving surface. Furthermore, when the water level in the first tank portion 5a becomes higher than the water level in the second tank portion 5b due to the discharge of flush water, the flush water in the second tank portion 5b flows little by little into the first tank portion 5a through the small holes 5c in the partition wall 5.

[0046] As flush water is discharged from the first drain port 4b, the water level in the first tank portion 5a drops. Then, when the water level in the first tank portion 5a falls below the set water level L1, the float 24 of the water supply valve 14 drops, opening the pilot valve 28. This reduces the pressure in the pressure chamber 18a, opening the main valve body 20, and starting the supply of water to the water pressure drive mechanism 16, as shown in Figure 5.

[0047] When flush water is supplied to the water pressure drive mechanism 16, the flush water that flows into the cylinder 16a pushes up the piston 16b against the biasing force of the spring 16c. As a result, the piston shaft 30 connected to the piston 16b pulls up the valve shaft 12a of the second drain valve 12, opening the second drain port 4c. In other words, the second drain valve 12 is driven and opened by the water supply pressure of the tap water supplied via the water supply valve 14.

[0048] When second drain outlet 4c is opened, flush water that had been stored in second tank section 5b of flush water tank 4 flows from second drain outlet 4c into jet water conduit 2g and is discharged from jet water outlet 2e. The jet water discharge from jet water outlet 2e fills drain trap pipe 2c and induces siphon action. Due to the occurrence of siphon action, accumulated water and waste in bowl section 2a are sucked into drain trap pipe 2c and discharged into the sewer pipe (not shown).

[0049] When the second drain valve 12 is raised to a predetermined height together with the piston 16b of the water hydraulic drive mechanism 16, the valve stem 12a of the second drain valve 12 is separated from the piston stem 30 by the clutch mechanism 32. As a result, the second drain valve 12 descends toward the second drain outlet 4c. Then, as shown in FIG. 6, the second drain valve 12 seats on the second drain outlet 4c, which is then closed. This stops the jet spouting of water from the jet water spouting port 2e. As mentioned above, because the float ball 12b of the second drain valve 12 is attached at a relatively high position, the second drain valve 12 seats on the second drain outlet 4c earlier than the first drain valve 10, even if the water levels in the first tank portion 5a and the second tank portion 5b are approximately the same.

[0050] In the state shown in Figure 6, the main valve body 20 of the water supply valve 14 is open, so flush water supplied from the water supply source 6 (tap water) is supplied to the water pressure drive mechanism 16 via the water supply valve 14 and flows into the second tank portion 5b from the water supply pipe 34 connected to the cylinder 16a. Meanwhile, the first drain valve 10 is still open, so the flush water in the first tank portion 5a flows out from the first drain outlet 4b and is discharged from the rim water spout 2d. After the jet water spouting has stopped, the flush water discharged from the rim water spout 2d is used as refill water to return the water level in the bowl portion 2a to the accumulated water level in the initial state.

[0051] Here, the flow rate of flush water flowing from second tank portion 5b into first tank portion 5a through small hole 5c in partition wall 5 is relatively small, so even if water is being supplied into second tank portion 5b from water supply pipe 34, the water level in first tank portion 5a will drop, and along with this, first drain valve 10 will also drop. Then, when the water level in flush water tank 4 drops to dead water level DWL, as shown in Figure 7, first drain valve 10 will seat on first drain outlet 4b and first drain valve 10 will close. This will stop rim spouting from rim spout outlet 2d.

[0052] Furthermore, even after first drain valve 10 is closed, main valve element 20 of water supply valve 14 remains open, so flush water supplied from water supply source 6 (tap water) flows from water supply pipe 34 via water supply valve 14 and water pressure drive mechanism 16 into second tank portion 5b of flush water tank 4. Then, when the water level in second tank portion 5b rises above the position of small hole 5c in partition wall 5, flush water flows from second tank portion 5b through small hole 5c into first tank portion 5a. Furthermore, when the water level in second tank portion 5b rises further, flush water flows from second tank portion 5b over partition wall 5 into first tank portion 5a. This causes the water level in first tank portion 5a to rise. Then, as shown in FIG. 8, when the water level in first tank portion 5a rises to set water level L1, float 24 of water supply valve 14 rises and pilot valve 28 closes.

[0053] In this way, when pilot valve 28 is closed, flush water that has flowed into pressure chamber 18a from bleed hole 20a provided in main valve element 20 of water supply valve 14 cannot flow out, and the pressure inside pressure chamber 18a rises. Then, the pressure inside pressure chamber 18a presses main valve element 20, causing it to seat on valve seat 22 and close main valve element 20. This stops the supply of water from water supply source 6 to water hydraulic drive mechanism 16 via water supply valve 14, and stops the supply of flush water into flush water tank 4.

[0054] When the water supply to the water hydraulic drive mechanism 16 is stopped, the flush water that has been supplied from the water hydraulic drive mechanism 16 into the second tank portion 5b causes the water level in the second tank portion 5b to be higher than the water level in the first tank portion 5a, as shown in Figure 8. As a result, the flush water in the second tank portion 5b flows into the first tank portion 5a through the small holes 5c in the partition wall 5. Therefore, the water level in the second tank portion 5b becomes lower than the height of the partition wall 5, and the water level in the first tank portion 5a becomes higher than the set water level L1. Then, the water levels in the first tank portion 5a and the second tank portion 5b become the same and return to the initial water level L2 (Figure 2).

[0055] Meanwhile, when the water supply to the water hydraulic drive mechanism 16 is stopped, the piston 16b inside the cylinder 16a, which had been pushed up by the water supply, is pushed down by the biasing force of the spring 16c. As a result, the piston shaft 30 attached to the piston 16b also drops. When the piston shaft 30 drops to a predetermined position, the clutch mechanism 32 reconnects the piston shaft 30 to the valve shaft 12a of the second drain valve 12. This completes one toilet flush, and the flush toilet device 1 returns to the initial state of the toilet flush, as shown in Figure 2.

[0056] 9, if the user rotates the lever handle 4a in one direction to flush the toilet again while flush water is being supplied from the water supply valve 14 into the flush water tank 4, the clutch mechanism 32 is disengaged, so the second drain valve 12 is not pulled up and the first drain valve 10 is pulled up. When the first drain valve 10 is pulled up, flush water in the first tank portion 5a is drained from the first drain valve 10 through the first drain port 4b. Furthermore, because flush water is being supplied from the water supply valve 14 to the second tank portion 5b via the water supply pipe 34, flush water flows over the partition wall 5 from the second tank portion 5b into the first tank portion 5a, and also flows from the second tank portion 5b into the first tank portion 5a through the small hole 5c.

[0057] The drainage flow rate (first drainage flow rate) of flush water discharged from first drain valve 10 through first drain outlet 4b is set to be greater than the feed flow rate of flush water supplied from water supply valve 14 through water supply pipe 34. Specifically, the drainage flow rate of flush water discharged from first drain valve 10 through first drain outlet 4b is set to about 10.5 to 12 L / min, preferably about 10 L / min, a value that enables the flush water discharged from rim spout 2d to adequately clean the waste receiving surface. The drainage flow rate is determined by the opening diameter of first drain outlet 4b, and by changing this opening diameter, the drainage flow rate of flush water discharged from first drain outlet 4b can be adjusted.

[0058] Furthermore, the supply flow rate of flush water supplied from water supply valve 14 via water supply pipe 34 is set to be smaller than the drainage flow rate of flush water discharged from first drain valve 10 via first drain port 4b. Specifically, the supply flow rate of flush water supplied from water supply valve 14 via water supply pipe 34 is set to approximately 5 to 7 L / min, a rate that enables the flush water that flows into cylinder 16a to push up piston 16b. The supply flow rate is determined by constant flow valve 14c arranged in inlet pipe 14a, and by changing this constant flow valve 14c, it is possible to adjust the supply flow rate of flush water supplied from water supply pipe 34 into flush water tank 4. Furthermore, the difference between the supply flow rate of flush water supplied from water supply valve 14 and the drainage flow rate of flush water discharged from first drain valve 10 is set to be approximately 4 L / min or more. In this way, the water supply flow rate and the drainage flow rate of the first tank section 50a are set to be unequal, thereby preventing the first drainage valve 10 from being open for a long period of time and causing cleaning water to continue to be drained.

[0059] In an embodiment of the present invention, the supply flow rate of flush water supplied from the water supply valve into the flush water tank is determined by a constant flow valve, but instead of this constant flow valve, an orifice may be provided and the supply flow rate of flush water supplied from the water supply valve into the flush water tank may be determined by the orifice.

[0060] According to the flush toilet device 1 of the embodiment of the present invention, the supply flow rate of flush water supplied from the water supply valve 14 into the flush water tank 4 is set to be different from the first drain flow rate of flush water discharged out of the flush water tank 4 from the first drain valve 10 and the second drain flow rate of flush water discharged out of the flush water tank 4 from the second drain valve 12, so even if only one of the first drain valve 10 or the second drain valve 12 is raised, the supply flow rate of flush water supplied from the water supply valve 14 into the flush water tank 4 and the drain flow rate of flush water discharged out of the flush water tank 4 from the first drain valve 10 and the second drain valve 12 will not be equal, and so flush water will continue to be discharged from the flush water tank 4 for a long period of time, preventing the generation of wasted water.

[0061] Furthermore, according to the flush toilet device 1 of this embodiment, the water supply flow rate is set to be smaller than both the first drainage flow rate and the second drainage flow rate, so flush water can be prevented from being continuously discharged from the flush water tank 4 for an extended period of time.

[0062] According to the flush toilet device 1 of this embodiment, the difference between the water supply flow rate and each of the first and second drainage flow rates is set to be 4 L / min or more, so that the water supply flow rate of flush water supplied from the water supply valve 14 into the flush water tank 4 and the drainage flow rate of flush water discharged out of the flush water tank 4 from the first drain valve 10 and the second drain valve 12 are not equal, making it possible to prevent flush water from being continuously discharged from the flush water tank for long periods of time.

[0063] Furthermore, according to the flush toilet device 1 of this embodiment, the water supply valve 14 is equipped with a constant flow valve 14c that determines the water supply flow rate, and the constant flow valve 14c can be used to adjust the water supply flow rate of flush water supplied from the water supply valve 14 into the flush water tank 4.

[0064] According to the flush toilet device 1 of this embodiment, the flush water tank is provided with a partition wall 5 that separates the first tank section 5a, which is provided with the first drain outlet 4b, from the second tank section 5b, which is provided with the second drain outlet 4c, making it possible to reduce variations in the drainage flow rate of the flush water discharged from each drain outlet out of the flush water tank 4.

[0065] Furthermore, according to the flush toilet device 1 of this embodiment, at least one of the first drain valve 10 and the second drain valve 12 is equipped with a clutch mechanism 32 that raises at least one of the first drain valve 10 and the second drain valve 12 in accordance with the operation of the lever handle 4a, and lowers at least one of the first drain valve 10 and the second drain valve 12 at a predetermined timing, so that the second drain valve 12 can be lowered at a predetermined timing, and variation in the drainage flow rate of flush water discharged from the drain outlet to the flush water tank 4 can be suppressed.

[0066] Although the embodiment of the present invention has been described above, various modifications can be made to the above-described embodiment. [Explanation of symbols]

[0067] 1 Flush toilet device 2 Toilet body 2a Bowl section 2c Drain trap pipe 2D Rim Spout 2e Jet spout 2F Rim Waterway 2g Jet Waterway 4 Cleaning water tank 4a Lever handle 4b First drain 4c Second drain 5 Partition wall 5a First tank section 5b Second tank section 5c small hole 6 Water source 8 Stop valve 10. First drain valve 10a ball chain 10b Floating ball 12 Second drain valve 12a Valve stem 12b Floating ball 14 Water supply valve 14a Inflow pipe 14b Outflow pipe 14c Constant flow valve 16 Water Hydraulic Drive Mechanism 16a cylinder 16b piston 16c spring 18 Main body 18a Pressure chamber 20 Main valve body 20a bleed hole 22 Valve seat 24 Float 26 Arm section 26a Support shaft 28 Pilot valve 28a Pilot valve port 30 rods 32 Clutch mechanism 34 Water supply pipe

Claims

1. A flush toilet device that flushes using flush water stored in a flush water tank, a toilet body having a bowl portion and a drain trap pipe extending from below the bowl portion; a flush water tank disposed behind the toilet body and configured to store flush water for flushing the bowl portion of the toilet body; a water supply valve for supplying flush water into the flush water tank; a first drain valve that switches between discharging and stopping flush water from a first water outlet provided in the bowl portion by opening and closing a first drain outlet provided in the flush water tank; a second drain valve that switches between discharging and stopping flush water from a second water outlet provided in the bowl portion by opening and closing a second drain outlet provided in the flush water tank; an operating portion for pulling up either the first drain valve or the second drain valve; and A flush toilet apparatus characterized in that the supply flow rate of flush water supplied from the water supply valve into the flush water tank is set to be different from each of a first drain flow rate of flush water discharged from the first drain valve to the outside of the flush water tank, and a second drain flow rate of flush water discharged from the second drain valve to the outside of the flush water tank.

2. 2. The flush toilet apparatus according to claim 1, wherein the water supply flow rate is set to be smaller than both the first drainage flow rate and the second drainage flow rate.

3. 3. The flush toilet apparatus according to claim 1 or 2, wherein the difference between the water supply flow rate and each of the first and second drainage flow rates is set to be 4 L / min or more.

4. 3. The flush toilet apparatus according to claim 1, wherein the water supply valve comprises a constant flow valve that determines the water supply flow rate.

5. 2. The flush toilet apparatus according to claim 1, wherein the flush water tank is provided with a partition wall that separates a first tank portion in which the first drain outlet is provided, and a second tank portion in which the second drain outlet is provided.

6. The flush toilet apparatus according to claim 1, wherein at least one of the first drain valve and the second drain valve is equipped with a clutch mechanism that raises the drain valve in accordance with the operation of the operating part and lowers the drain valve at a predetermined timing.

Images