Water-washing toilet device

Abstract

To provide a water closet device capable of actualizing water saving while effectively utilizing washing water stored in a washing water tank for sufficiently securing a rim water discharge time.SOLUTION: A water closet (1) includes a water closet body (2) including a bowl part (2a), and a drain trap pipeline (2b), a washing water tank body (4), a rim drain valve (8) for controlling the discharge and stop of the washing water from a rim water discharge port (2c), a jet drain valve (10) for controlling the discharge and stop of the washing water from a jet water discharge port (2d), a rim water channel (2e) for guiding the washing water drained via the rim drain valve to the rim water discharge port, and a jet water channel (2f) for guiding the washing water drained via the jet drain valve to the jet water discharge port. The cross section area of the rim water discharge port is smaller than the cross section area of the jet water discharge port.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a flushing toilet device, and particularly to a flushing toilet device that performs cleaning with the cleaning water stored in a cleaning water tank.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2015-168994 (Patent Document 1) describes a flushing toilet. In this flushing toilet, by opening the drain valve provided in the water storage tank device, cleaning water is discharged from two rim nozzles and a jet nozzle provided in the flushing toilet, and the bowl part is cleaned. Further, in this flushing toilet, the cleaning water discharged from the water storage tank device first flows into a single water conduit, and this water conduit is branched, and the cleaning water is discharged from two rim nozzles and a jet nozzle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the flushing toilet described in Patent Document 1, the instantaneous flow rate of the cleaning water discharged from the two rim nozzles and the jet nozzle changes as shown in FIG. 8, and the cleaning water stored in the water storage tank device is not fully utilized for toilet cleaning. FIG. 8 is a graph showing, as a comparative example, an example of the instantaneous flow rate of the cleaning water in a flushing toilet of a type in which the cleaning water flowing into a single water conduit is branched and discharged from the rim nozzle and the jet nozzle as described in Patent Document 1.

[0005] In other words, in this type of flush toilet, a large flow of flushing water is discharged from the jet nozzle immediately after the drain valve opens, and then the instantaneous flow rate of flushing water discharged from the two rim nozzles gradually increases. When the drain valve closes, the flushing water discharged from the two rim nozzles stops immediately, while the discharge from the jet nozzle continues for a predetermined time even after the valve is closed. This is because the rim nozzles are located at a high position, so the discharge stops immediately when the drain valve is closed, whereas the jet nozzles are located at a low position, so the flushing water remaining in the water channel is discharged even after the drain valve is closed. Thus, in the flush toilet described in Patent Document 1, the duration of rim discharge is short, and there is a possibility that the bowl surface cannot be sufficiently cleaned. Furthermore, if the duration of rim discharge is increased in order to sufficiently clean the bowl surface, the total amount of flushing water increases significantly, making it impossible to achieve water conservation.

[0006] Therefore, the present invention aims to provide a flush toilet device that uses flush water stored in a flush water tank to ensure sufficient rim water discharge time while also achieving water conservation. [Means for solving the problem]

[0007] To solve the above-mentioned problems, the present invention provides a flush toilet device that performs flushing with flushing water stored in a flushing water tank, comprising: a flush toilet body equipped with a bowl portion and a drain trap pipe extending from the lower part of the bowl portion; a flushing water tank body for storing flushing water for flushing the bowl portion of the flush toilet body; a rim drain valve provided in the flushing water tank body for controlling the discharge and stopping of flushing water from one or more rim outlets provided in the flush toilet body; a jet drain valve provided in the flushing water tank body for controlling the discharge and stopping of flushing water from a jet outlet provided in the flush toilet body; a rim water channel provided in the flush toilet body for guiding the flushing water discharged via the rim drain valve to one or more rim outlets; and a jet water channel provided in the flush toilet body for guiding the flushing water discharged via the jet drain valve to a jet outlet, characterized in that the total cross-sectional area of ​​one or more rim outlets is smaller than the cross-sectional area of ​​the jet outlets.

[0008] With the present invention configured as described above, the cleaning water from the cleaning water tank body is discharged from the rim outlet via the rim drain valve and rim water channel, and the cleaning water is discharged from the jet outlet via the jet drain valve and jet water channel. Therefore, the amount of cleaning water discharged from the rim outlet and the amount of cleaning water discharged from the jet outlet can be controlled independently, ensuring a sufficient amount of water is discharged from the rim and thoroughly cleaning the bowl. Furthermore, since the combined cross-sectional area of ​​the rim outlets is smaller than the cross-sectional area of ​​the jet outlets, even if sufficient time is ensured for water discharge from the rim outlets, the amount of cleaning water used does not increase significantly, thus achieving water conservation.

[0009] In the present invention, preferably, the rim water channel is a path from the rim drain valve to one or more rim outlets, in which one or more rim outlets are all located at the lowest position.

[0010] According to the present invention configured in this way, in the path from the rim drain valve to one or more rim discharge ports, the rim water conduit is such that one or more rim discharge ports are all located at the lowest position. Therefore, the cleaning water discharged via the rim drain valve is discharged from the rim discharge ports without taking a roundabout route. As a result, the instantaneous flow rate of the cleaning water discharged from the rim discharge ports rises quickly, and a sufficient cleaning effect can be obtained even if the discharge time is reduced.

[0011] In the present invention, preferably, the jet drain valve is opened after a predetermined time has elapsed after the rim drain valve has opened, and the discharge of cleaning water from one or more rim outlets continues even after the jet drain valve has closed.

[0012] With the present invention configured in this way, the jet drain valve opens after a predetermined time has elapsed after the rim drain valve has opened. As a result, the bowl is cleaned by the rim discharge, and then the siphon action is activated by the jet discharge, allowing the cleaning water to be efficiently distributed for cleaning the bowl surface and for discharging waste. Furthermore, since the discharge of cleaning water from the rim outlet continues even after the jet drain valve has closed, the water discharged from the rim outlet can be used to refill the bowl.

[0013] In the present invention, preferably, the instantaneous flow rate of the cleaning water discharged from one or more rim outlets is highest at the start of discharge and then gradually decreases.

[0014] According to the present invention configured in this way, the instantaneous flow rate of the cleaning water discharged from the rim outlet is highest at the start of discharge and then gradually decreases. Therefore, after the siphon action is activated by the jet discharge, the instantaneous flow rate of the cleaning water from the rim outlet has decreased. As a result, the siphon breaks down more quickly after the waste is discharged by the siphon action, which suppresses the unnecessary discharge of cleaning water into the drain trap pipe and allows for efficient use of the cleaning water.

[0015] In the present invention, preferably, the toilet bowl body is equipped with one rim spout.

[0016] According to the present invention configured in this way, since the toilet bowl body is equipped with one rim outlet, the total cross-sectional area of ​​the rim outlet can be easily set to be small, and the amount of flushing water used can be reduced while the discharge time of flushing water from the rim outlet can be extended.

[0017] In the present invention, preferably, the rim drain valve is located further outward in the width direction from the toilet bowl body than the jet drain valve, and the rim water channel extends from the toilet bowl body to the rim outlet, passing further outward in the width direction from the seat hole provided on the upper surface of the toilet bowl body.

[0018] According to the present invention configured in this way, the rim drain valve is located further outward in the width direction of the toilet bowl body than the jet drain valve, and the rim water channel extends from the seat hole provided on the upper surface of the toilet bowl body to the rim outlet, passing further outward in the width direction of the toilet bowl body. As a result, while securing sufficient space for the jet water channel within the toilet bowl body, the rim water channel connecting the rim drain valve and the rim outlet can be made shorter, allowing rim water discharge to start earlier. [Effects of the Invention]

[0019] According to the flush toilet device of the present invention, it is possible to save water while ensuring sufficient rim water discharge time by using the flush water stored in the flush water tank. [Brief explanation of the drawing]

[0020] [Figure 1] This is a top view showing a schematic configuration of a flush toilet device according to an embodiment of the present invention. [Figure 2] This is a side cross-sectional view showing the schematic configuration of a flush toilet device according to an embodiment of the present invention. [Figure 3] This is a cross-sectional view of the flush toilet body of a flush toilet device according to an embodiment of the present invention, taken along the line III-III in Figure 1. [Figure 4]It is a block diagram showing a cleaning water supply system in a flush toilet device according to an embodiment of the present invention. [Figure 5] It is a front cross-sectional view showing the internal structure of a cleaning water tank body provided in a flush toilet device according to an embodiment of the present invention. [Figure 6] It is a time chart showing the operation of a flush toilet device according to an embodiment of the present invention. [Figure 7] It is a diagram showing an example of the instantaneous flow rate of the cleaning water discharged from the rim water outlet and the jet water outlet respectively in the flush toilet device of the present embodiment. [Figure 8] As a comparative example, it is a graph showing an example of the instantaneous flow rate of the cleaning water in a flush toilet of a type in which the cleaning water flowing into a single water conduit is branched and discharged from the rim water outlet and the jet water outlet.

Embodiments for Carrying Out the Invention

[0021] Next, a flush toilet device according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a top view showing the schematic configuration of a flush toilet device according to an embodiment of the present invention. FIG. 2 is a side cross-sectional view showing the schematic configuration of a flush toilet device according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of the flush toilet body of the flush toilet device according to an embodiment of the present invention, cut along line III-III of FIG. 1. FIG. 4 is a block diagram showing a cleaning water supply system in a flush toilet device according to an embodiment of the present invention. FIG. 5 is a front cross-sectional view showing the internal structure of a cleaning water tank body provided in a flush toilet device according to an embodiment of the present invention.

[0022] As shown in FIGS. 1 and 2, the flush toilet device 1 according to an embodiment of the present invention is composed of a flush toilet body 2 and a cleaning water tank body 4 arranged at the rear of the flush toilet body 2. The flush toilet device 1 of the present embodiment is configured to be cleaned by operating a lever handle 4a provided on the cleaning water tank body 4 after use. In FIGS. 1 and 2, the drain valve etc. provided in the cleaning water tank body 4 are not shown.

[0023] The flush toilet body 2 comprises a bowl section 2a and a drain trap pipe 2b extending from the lower part of the bowl section 2a. A rim outlet 2c is provided on the upper edge of the bowl section 2a, and a jet outlet 2d is provided on the lower part of the bowl section 2a. When the toilet is flushed, flushing water is discharged from these rim outlets 2c and jet outlets 2d at predetermined timings, cleaning the waste receiving surface of the bowl section 2a, and the waste and flushing water in the bowl section 2a are discharged into the drain trap pipe 2b. The waste and flushing water discharged into the drain trap pipe 2b are then discharged into the sewer pipe (not shown) through a drain socket (not shown).

[0024] Furthermore, two seat holes 2g are provided on the upper surface of the flush toilet body 2, behind the bowl portion 2a and in front of the flush water tank body 4. These seat holes 2g are circular cross-section holes provided on the upper surface of the flush toilet body 2 for fixing a toilet seat (not shown), and are provided symmetrically on both sides of the center line in the width direction of the flush toilet body 2.

[0025] As shown in Figure 4, cleaning water is supplied to the cleaning water tank body 4 from a water supply source 6 such as a water tap, and the supplied cleaning water is stored inside the cleaning water tank body 4. The cleaning water tank body 4 also has a rim drain valve 8 and a jet drain valve 10 built into it, and is configured to discharge or stop the cleaning water from a drain port provided at the bottom of the cleaning water tank body 4.

[0026] In this embodiment, by opening the rim drain valve 8, flushing water is discharged from the rim water discharge outlet 4b (Figure 1) of the flushing water tank body 4, and is discharged from the rim water outlet 2c through the rim water channel 2e formed inside the flush toilet body 2. Also, by opening the jet drain valve 10, flushing water is discharged from the jet water discharge outlet 4c (Figure 1) of the flushing water tank body 4, and the discharged flushing water is discharged from the jet water outlet 2d through the jet water channel 2f formed inside the flush toilet body 2.

[0027] As shown in Figures 1 and 2, the jet water outlet 4c is located in the center of the width direction of the toilet bowl body 2. The jet water channel 2f connected to this jet water outlet 4c extends diagonally downward and forward of the toilet bowl body 2, then splits into two branches that pass through both sides of the bottom of the bowl portion 2a, and then rejoins at the front of the bowl portion before being connected to the jet water outlet 2d.

[0028] On the other hand, as shown in Figure 1, the rim water outlet 4b is located further outward in the width direction than the jet water outlet 4c, and the rim drain valve 8 and the jet drain valve 10 are positioned directly above the rim water outlet 4b and the jet water outlet 4c, respectively. Therefore, the rim drain valve 8 is located further outward in the width direction than the jet drain valve 10. The rim water channel 2e extending from the rim water outlet 4b extends to the rim water outlet 2c, passing further outward in the width direction than the seat hole 2g provided on the upper surface of the toilet body 2.

[0029] Furthermore, in this embodiment, the rim water conduit 2e has the cross-sectional shape shown in Figure 3. Figure 3 is a diagram showing a cross-section of the rim water conduit 2e cut along its length (along the line III-III in Figure 1). As shown in Figure 3, the rim water conduit 2e extends from the rim water discharge outlet 4b, which opens upward, to the rim water outlet 2c. The rim water outlet 2c is located at the lowest position in the path from the rim drain valve 8 to the rim water outlet 2c. In other words, as shown in Figure 3, the bottom surface of the rim water conduit 2e is lowest at the rim water outlet 2c. Therefore, the cleaning water discharged through the rim drain valve 8 is discharged from the rim water outlet 2c without taking a roundabout route, the instantaneous flow rate of the cleaning water discharged from the rim water outlet 2c rises quickly, and a sufficient cleaning effect can be obtained even if the water discharge time is reduced.

[0030] In this embodiment, one rim outlet 2c is provided near the center in the width direction at the rear of the bowl portion 2a. Also in this embodiment, the cross-sectional area of ​​the rim outlet 2c is smaller than the cross-sectional area of ​​the jet outlet 2d. When multiple rim outlets 2c are provided, it is preferable that the sum of the cross-sectional areas of each rim outlet 2c is smaller than the cross-sectional area of ​​the jet outlet 2d. Furthermore, when multiple rim outlets 2c are provided, it is preferable that the bottom surfaces of each rim outlet 2c be arranged to be at the same height, and that the height of their bottom surfaces be the lowest in the path of the rim water conduit 2e from the rim drain valve 8 to the rim outlet 2c.

[0031] Next, the internal structure of the cleaning water tank body 4 will be described with reference to Figures 4 and 5. As shown in Figures 4 and 5, an inner tank 14 is located inside the cleaning water tank body 4. The cleaning water tank body 4 also contains a rim drain valve 8 located outside the inner tank 14 and inside the cleaning water tank body 4, a jet drain valve 10 located inside the inner tank 14, a ball tap 16 which is a water supply valve, and a water pressure drive mechanism 18.

[0032] The flushing water tank body 4 and the inner tank 14 are containers configured to store flushing water to be supplied to the flush toilet body 2. In this embodiment, the flushing water tank body 4 is made of ceramic, and the inner tank 14, which is located inside the flushing water tank body 4, is made of resin. In this specification, "flushing water stored in the flushing water tank body 4" includes not only the flushing water stored inside the flushing water tank body 4 (outside the inner tank 14), but also the flushing water stored in the inner tank 14.

[0033] Furthermore, as shown in Figures 1 and 5, the bottom surface of the cleaning water tank body 4 is provided with a drain port 4b for rim discharge and a drain port 4c for jet discharge, and in this embodiment, these drain ports are circular in shape. As shown in Figure 2, in this embodiment, the drain port 4b for rim discharge and the drain port 4c for jet discharge (only the drain port 4c for jet discharge is shown in Figure 2) are formed at the same height as the upper end surface of the bowl portion 2a, while the rim discharge port 2c is formed below the upper end surface of the bowl portion 2a. Therefore, in this embodiment, both the drain port 4b for rim discharge and the drain port 4c for jet discharge are located higher than the lower end of the rim discharge port 2c.

[0034] Furthermore, in this embodiment, the flushing water stored in the flushing water tank body 4 (and outside the inner tank 14) flows into the rim water channel 2e of the toilet bowl body 2 through the rim water discharge outlet 4b, and the flushing water stored in the inner tank 14 flows into the jet water channel 2f of the toilet bowl body 2 through the jet water discharge outlet 4c. However, the inner tank 14 can be omitted, in which case the flushing water stored in a single (undivided) space within the flushing water tank body 4 is supplied to the toilet bowl body 2 through the rim water discharge outlet 4b and the jet water discharge outlet 4c, respectively.

[0035] As shown in Figure 5, the inner tank 14 is positioned on the bottom surface of the flushing water tank body 4, and a circular outlet 14a is formed on the bottom surface of the inner tank 14. This outlet 14a of the inner tank 14 is arranged concentrically with the jet water discharge outlet 4c provided in the flushing water tank body 4. That is, in this embodiment, the center of the circular jet water discharge outlet 4c and the circular outlet 14a coincide in a top view. Therefore, the flushing water in the inner tank 14 is discharged through the outlet 14a of the inner tank 14 and the jet water discharge outlet 4c of the flushing water tank body 4 and flows into the jet water channel 2f of the flush toilet body 2.

[0036] Furthermore, in this embodiment, the outlet 14a of the inner tank 14 is formed by a drain outlet forming member 14b, which is a separate component from the main body of the inner tank 14. This drain outlet forming member 14b is a cylindrical member that is watertightly attached to the bottom surface of the inner tank 14 and forms the outlet 14a on its inside. In addition, a seat surface is provided at the upper end of the drain outlet forming member 14b, and the outlet 14a is closed when the jet drain valve 10 is seated on this seat surface. Therefore, in this embodiment, the seat surface on which the jet drain valve 10 is seated is made of a separate component from the inner tank 14.

[0037] Furthermore, an overflow pipe 15, which serves as an exhaust path, is attached to the side of the drain outlet forming member 14b. This overflow pipe 15 is an L-shaped pipe that extends from the side of the drain outlet forming member 14b and opens upward above the upper end of the inner tank 14. As a result, the space inside the drain outlet forming member 14b and the outside air above the water surface in the inner tank 14 are connected by the overflow pipe 15. When the water level of the cleaning water in the cleaning water tank body 4 exceeds the height of the overflow pipe 15, the cleaning water flows into the overflow pipe 15 and is discharged through the drain outlet forming member 14b into the jet water channel 2f.

[0038] Next, as shown in Figure 5, the rim drain valve 8 is a valve body positioned to open and close the rim water discharge outlet 4b provided in the flush water tank body 4. When the rim drain valve 8 is pulled upward, the rim water discharge outlet 4b is opened. As a result, the flush water in the flush water tank body 4 is discharged into the rim water channel 2e (Figure 1) of the flush toilet body 2 and discharged from the rim water outlet 2c. Therefore, the rim drain valve 8 is provided in the flush water tank body 4 and controls the discharge and stopping of flush water from the rim water outlet 2c provided in the flush toilet body 2.

[0039] In this embodiment, the user rotates a lever handle 4a provided on the cleaning water tank body 4, which pulls the ball chain 8a (Figure 5) connected to the rim drain valve 8, thereby raising the rim drain valve 8. As a modification, the present invention can also be configured so that the rim drain valve 8 is raised and cleaning is performed based on a control signal from a remote control device (not shown) or a detection signal from a human presence sensor (not shown).

[0040] The jet drain valve 10 is installed at the jet discharge outlet 4c of the cleaning water tank body 4 and is a valve body positioned to open and close the outlet 14a provided in the inner tank 14. By pulling the jet drain valve 10 upward, the jet drain valve 10 is separated from the seat surface of the outlet 14a, and the outlet 14a is opened. As a result, the cleaning water in the inner tank 14 flows into the jet water channel 2f (Figure 1) through the outlet 14a and the jet discharge outlet 4c of the cleaning water tank body 4.

[0041] In this way, by pulling up the jet drain valve 10, the flushing water in the inner tank 14 is discharged from the outlet 14a, flows through the jet water discharge outlet 4c into the jet water channel 2f (Figure 1) of the toilet bowl body 2, and is discharged from the jet water outlet 2d. Therefore, the jet drain valve 10 is installed in the flushing water tank body 4 and controls the discharge and stopping of flushing water from the jet water outlet 2d provided in the toilet bowl body 2. If the inner tank 14 is omitted, the jet drain valve 10 directly opens and closes the jet water discharge outlet 4c, and the flushing water in the flushing water tank body 4 is discharged.

[0042] Furthermore, as shown in Figure 5, in this embodiment, the jet drain valve 10 is configured to be pulled up from the outlet 14a by a hydraulic drive mechanism 18. That is, the jet drain valve 10 is a valve body with a valve shaft 10a extending upward, and the valve shaft 10a is pulled up by the hydraulic drive mechanism 18. When the jet drain valve 10 is pulled up to a predetermined height, it is detached from the hydraulic drive mechanism 18 and slowly descends to close the outlet 14a. The configuration of the hydraulic drive mechanism 18 will be described later.

[0043] Furthermore, the ball tap 16, which is a water supply valve, is configured to allow the cleaning water supplied from the water source 6 to flow in through the inlet pipe 16a and to switch the supply and stop of cleaning water to be stored in the cleaning water tank body 4 and the inner tank 14.

[0044] As shown in Figure 5, the ball tap 16 is connected to an inlet pipe 16a and an outlet pipe 16b, and the valve seat 20b is opened and closed by a built-in main valve body 20a. The ball tap 16 also includes a float 22 and an arm portion 24 that is rotated by the float 22. The float 22 in the ball tap 16 operates in conjunction with the water level in the cleaning water tank body 4, and when the float 22 drops to a predetermined position, the built-in main valve body 20a opens, and cleaning water is supplied to the water pressure drive mechanism 18.

[0045] Specifically, a main valve body 20a is positioned inside the ball tap 16 to open and close the valve seat 20b. When the valve is open, tap water flowing in from the inlet pipe 16a flows through the valve seat 20b and out into the outlet pipe 16b. The outlet pipe 16b is connected to the water pressure drive mechanism 18.

[0046] The main valve body 20a is a generally disc-shaped diaphragm-type valve body and is mounted inside the ball tap 16 so as to be able to seat and separate from the valve seat 20b. Inside the ball tap 16, a pressure chamber 20c is formed on the opposite side of the valve seat 20b from the main valve body 20a. The ball tap 16 is provided with a pilot valve port (not shown) that communicates with the inside of this pressure chamber 20c. When this pilot valve port (not shown) is closed and the pressure inside the pressure chamber 20c increases, this pressure presses the main valve body 20a against the valve seat 20b, causing it to seat on the valve seat 20b.

[0047] On the other hand, the float 22 is supported by an arm portion 24, to which a pilot valve (not shown) is connected, and the pilot valve is configured to move as the arm portion 24 rotates. In this embodiment, the float 22 is located inside the flush water tank body 4 and moves up and down according to the water level inside the flush water tank body 4. As a result, when the water level inside the flush water tank body 4 rises above a predetermined level, the float 22 is pushed upward, and the pilot valve (not shown) moves accordingly, closing the pilot valve port (not shown) provided on the ballcock 16. On the other hand, when the flush water inside the flush water tank body 4 is drained and the water level drops, the float 22 moves downward, and the pilot valve port (not shown) opens. For this reason, when the toilet is waiting to be flushed and the water level inside the flush water tank body 4 is higher than a predetermined level, the pilot valve port (not shown) of the ballcock 16 is closed.

[0048] Furthermore, the tap water that flows into the ball tap 16 from the inlet pipe 16a flows into the pressure chamber 20c. When the pilot valve port (not shown) is closed, the pressure in the pressure chamber 20c increases. When the pressure in the pressure chamber 20c increases in this way, the main valve body 20a is pressed toward the valve seat 20b by this pressure, and the valve seat 20b is closed by the main valve body 20a.

[0049] On the other hand, when the rim drain valve 8 is opened by the cleaning operation and the water level in the cleaning water tank body 4 falls below a predetermined level, the float 22 lowers, the pilot valve (not shown) moves, and the pilot valve port (not shown) opens. When the pilot valve port (not shown) opens, the pressure in the pressure chamber 20c decreases. As a result, the main valve body 20a moves so as to be pulled away from the valve seat 20b, and the valve seat 20b opens. In this way, when the pilot valve port (not shown) is open, the pressure in the pressure chamber 20c does not increase, and the valve seat 20b remains in an open state.

[0050] Next, the configuration of the hydraulic drive mechanism 18 will be described with reference to Figure 5. The hydraulic drive mechanism 18 is configured to drive the jet drain valve 10 using the water supply pressure of the cleaning water supplied from the water tap to the cleaning water tank body 4. Specifically, the hydraulic drive mechanism 18 includes a cylinder 18a into which water supplied from the ball tap 16 flows, a piston 18b slidably disposed within the cylinder 18a, and a rod 28 protruding from the lower end of the cylinder 18a to drive the jet drain valve 10. Furthermore, a spring 18c is placed inside the cylinder 18a to bias the piston 18b downward, and a packing is attached to the piston 18b to ensure watertightness between the inner wall surface of the cylinder 18a and the piston 18b. In addition, a clutch mechanism 30 is provided at the lower end of the rod 28, and this clutch mechanism 30 connects / disconnects the rod 28 and the valve stem 10a of the jet drain valve 10.

[0051] The cylinder 18a is a cylindrical component positioned with its axis oriented vertically, and it slidably houses a piston 18b inside. An outlet pipe 16b extending from the ball tap 16 is connected to the lower end of the cylinder 18a, allowing the cleaning water flowing out of the ball tap 16 to enter the cylinder 18a. As a result, the piston 18b inside the cylinder 18a is pushed up against the biasing force of the spring 18c by the water flowing into the cylinder 18a.

[0052] On the other hand, an outlet hole is provided at the upper end of the cylinder 18a, and a water supply pipe 32 is connected to this outlet hole. Therefore, when water flows into the cylinder 18a from the outlet pipe 16b connected to the lower part of the cylinder 18a, the piston 18b is pushed upward from the lower part of the cylinder 18a. When the piston 18b is pushed up to a position above the outlet hole, the water that has flowed into the cylinder 18a flows out through the outlet hole into the water supply pipe 32. The cleaning water that flows into the water supply pipe 32 then flows into the inner tank 14.

[0053] The rod 28 is a rod-shaped member connected to the lower surface of the piston 18b, and extends downward from inside the cylinder 18a through a through hole formed in the bottom surface of the cylinder 18a. The valve stem 10a of the jet drain valve 10 is connected to the lower end of the rod 28 via a clutch mechanism 30, and the rod 28 connects the piston 18b and the jet drain valve 10. Therefore, when water flows into the cylinder 18a and pushes the piston 18b upward, the rod 28 connected to the piston 18b lifts the jet drain valve 10 upward, and the jet drain valve 10 opens.

[0054] Furthermore, a gap is provided between the rod 28 protruding from below the cylinder 18a and the inner wall of the through-hole of the cylinder 18a, and some of the water that flows into the cylinder 18a flows out through this gap. The water that flows out through the gap flows into the inner tank 14. However, since this gap is relatively narrow and has high flow resistance, even when water flows out through the gap, the water flowing into the cylinder 18a from the outlet pipe 16b increases the pressure inside the cylinder 18a, pushing up the piston 18b against the biasing force of the spring 18c.

[0055] Furthermore, the clutch mechanism 30 detachably connects the rod 28 and the jet drain valve 10. When the jet drain valve 10 is lifted a predetermined distance together with the rod 28, the clutch mechanism 30 is configured to disconnect the valve stem 10a of the jet drain valve 10 from the rod 28. When the clutch mechanism 30 is disconnected, the jet drain valve 10 is no longer linked to the movement of the piston 18b and the rod 28, and the jet drain valve 10 descends along with the decrease in the water level in the inner tank 14, closing the outlet 14a of the inner tank 14.

[0056] Next, with further reference to Figures 6 and 7, the operation of the flush toilet device 1 according to an embodiment of the present invention will be explained. Figure 6 is a time chart showing the operation of the flush toilet device 1 according to an embodiment of the present invention, showing the state of jet water discharge, rim water discharge, and ballcock in order from top to bottom. Figure 7 is a diagram showing an example of the instantaneous flow rate of flushing water discharged from the rim water outlet 2c and the jet water outlet 2d, respectively, in the flush toilet device 1 of this embodiment.

[0057] First, in the standby state for toilet flushing, the rim water discharge outlet 4b of the flushing water tank body 4 and the outlet 14a of the inner tank 14 are closed by the rim drain valve 8 and the jet drain valve 10, respectively. Also, in the standby state, the initial water level in the flushing water tank body 4 is higher than the predetermined water level, which causes the pilot valve port (not shown) of the ballcock 16 (Figure 5) to be closed, and the valve seat 20b is closed by the main valve body 20a.

[0058] Next, at time t1 in Figure 6, when the user rotates the lever handle 4a (Figure 5) of the flushing water tank body 4 to flush the toilet, the ball chain 8a connected to it pulls up the rim drain valve 8. This separates the rim drain valve 8 from the rim water outlet 4b, and the rim water outlet 4b opens. When the rim water outlet 4b opens, the flushing water stored inside the flushing water tank body 4 (outside the inner tank 14) flows from the rim water outlet 4b into the rim water channel 2e (Figure 1) and is discharged from the rim water outlet 2c. The water discharged from the rim water outlet 2c creates a swirling flow on the waste receiving surface of the bowl section 2a, cleaning the waste receiving surface. The discharge of cleaning water from the rim outlet 2c creates a swirling flow on the inner wall surface of the bowl section 2a. This swirling flow circulates within the bowl section 2a at least once, thoroughly cleaning the entire bowl section 2a.

[0059] As shown in Figure 7, in the flush toilet device 1 of this embodiment, the instantaneous flow rate of flushing water discharged from the rim outlet 2c rises quickly when the rim drain valve 8 is opened. On the other hand, in a flush toilet of the type in which flushing water flowing into a single water conduit is branched and discharged, as shown in the comparative example in Figure 8, the instantaneous flow rate of flushing water discharged from each rim outlet takes time to rise after the drain valve is opened. This is because, in the flush toilet device 1 of this embodiment, the rim outlet 2c is located at the lowest position along the entire path of the rim water conduit 2e from the rim water discharge drain outlet 4b to the rim outlet 2c (Figure 3).

[0060] In contrast, in the comparative example flush toilet device shown in Figure 8, the flushing water discharged from the flushing water tank passes through a water conduit leading to the jet outlet. Therefore, the flushing water reaches the rim outlet via a water conduit located lower than the rim outlet. Thus, in the comparative example flush toilet device shown in Figure 8, the flushing water to the rim outlet is discharged via a roundabout route, which means that it takes time for the instantaneous flow rate of the flushing water to increase after the drain valve is opened.

[0061] Next, as the cleaning water is discharged from the rim discharge outlet 4b, the water level in the cleaning water tank body 4 decreases. This causes the float 22 of the ball tap 16 (Figure 5) to drop, and the pilot valve port (not shown) opens. As a result, the pressure in the pressure chamber 20c decreases, the main valve body 20a opens, and cleaning water is supplied to the hydraulic drive mechanism 18 (Figure 5) through the outlet pipe 16b.

[0062] When cleaning water is supplied to the hydraulic drive mechanism 18, the cleaning water flowing into the cylinder 18a pushes up the piston 18b against the biasing force of the spring 18c. This causes the rod 28 connected to the piston 18b to pull up the valve stem 10a of the jet drain valve 10, opening the outlet 14a of the inner tank 14. In other words, the jet drain valve 10 is driven and opened by the water pressure of the tap water supplied via the ball tap 16.

[0063] As a result, at time t2 in Figure 6, the outlet 14a is opened, and the cleaning water stored in the inner tank 14 flows through the outlet 14a and the jet discharge outlet 4c into the jet water conduit 2f (Figure 2), and is discharged from the jet discharge port 2d. Here, the jet discharge port 2d has a larger cross-sectional area than the rim discharge port 2c, and the hydrostatic pressure of the cleaning water in the inner tank 14 is higher than the hydrostatic pressure of the cleaning water in the cleaning water tank body 4. Therefore, as shown in Figure 7, the instantaneous flow rate of the jet discharge is greater than the instantaneous flow rate of the rim discharge.

[0064] Furthermore, the jet discharge from the jet outlet 2d fills the drain trap pipe 2b with water, inducing a siphon effect. Due to the siphon effect, the water and waste in the bowl section 2a are drawn into the drain trap pipe 2b and discharged into the sewer pipe (not shown). Thus, in this embodiment, the jet drain valve 10 is opened after a predetermined time has elapsed after the rim drain valve 8 has opened. That is, while the discharge of cleaning water from the rim outlet 2c continues, the discharge of cleaning water from the jet outlet 2d is started, and the siphon effect is activated in the drain trap pipe 2b.

[0065] Thus, in the flush toilet device 1 of this embodiment, a siphon effect can be generated in the drain trap pipe 2b soon after the jet drain valve 10 is opened. In particular, the flushing water initially discharged from the jet water outlet 4c (discharge port 14a) has a high hydrostatic pressure because the water level in the inner tank 14 is high. As a result, the flushing water with high hydrostatic pressure can be effectively utilized for flushing the toilet, and the instantaneous flow rate of the flushing water discharged from the jet water outlet 2d can be increased.

[0066] Meanwhile, when the jet drain valve 10 is raised to a predetermined height along with the piston 18b of the hydraulic drive mechanism 18, the clutch mechanism 30 (Figure 5) disengages the valve stem 10a of the jet drain valve 10 from the rod 28. As a result, the jet drain valve 10 descends toward the outlet 14a as the water level in the inner tank 14 decreases. Then, at time t3 in Figure 6, the jet drain valve 10 seats toward the outlet 14a, and the outlet 14a is closed.

[0067] As shown in Figure 7, when the jet drain valve 10 is closed, the instantaneous flow rate of the cleaning water discharged from the jet outlet 2d decreases. Note that in Figure 7, the jet discharge continues even after the jet drain valve 10 is closed because the cleaning water remaining in the jet conduit 2f falls due to gravity and is discharged from the jet outlet 2d. In addition, the instantaneous flow rate of the cleaning water discharged from the rim outlet 2c is lower than at the start of discharge. Therefore, the siphon action stops (siphon break) earlier after the accumulated water and waste in the bowl section 2a are discharged into the drain trap pipe 2b by the siphon action, and it is possible to suppress the excessive discharge of cleaning water from the drain trap pipe 2b.

[0068] On the other hand, in the comparative example flush toilet device shown in Figure 8, when the drain valve is closed, the instantaneous flow rate of the jet discharge immediately decreases, and even after the drain valve is closed, the flushing water remaining in the water conduit is discharged from the jet outlet. Also, in the comparative example flush toilet device shown in Figure 8, when the drain valve is closed, the instantaneous flow rate of water discharged from the rim outlet also decreases rapidly and thereafter becomes almost zero. This is because the rim outlet is located at a higher position than the jet outlet, so after the drain valve is closed, most of the flushing water remaining in the water conduit goes to the jet outlet. Thus, in the comparative example flush toilet device shown in Figure 8, the rim discharge stops almost simultaneously with the closing of the drain valve.

[0069] At time t3 in Figure 6, when the jet drain valve 10 is closed and the jet discharge stops, the siphon action in the drain trap pipe 2b stops, and the cleaning water in the bowl section 2a is no longer drawn into the drain trap pipe 2b. On the other hand, water discharge from the rim outlet 2c continues, and rim water discharge continues even after the jet drain valve 10 is closed. In this way, after the siphon action stops, the cleaning water discharged from the rim outlet 2c is not discharged into the drain trap pipe 2b, and is used to refill the water accumulated in the bowl section 2a.

[0070] When the main valve body 20a of the ball tap 16 is open, the cleaning water supplied from the water source 6 (water supply) is supplied to the hydraulic drive mechanism 18 via the ball tap 16 and flows into the inner tank 14 through the water supply pipe 32 (Figure 5) connected to the cylinder 18a. Therefore, after the jet discharge stops at time t3 in Figure 6, the water level in the inner tank 14 rises due to the cleaning water flowing in from the water supply pipe 32.

[0071] Meanwhile, since the rim drain valve 8 remains open, the cleaning water in the cleaning water tank body 4 flows out from the rim discharge outlet 4b, and the water level in the cleaning water tank body 4 continues to decrease. Then, at time t4 in Figure 6, when the water level in the cleaning water tank body 4 drops to a predetermined dead water level, the rim drain valve 8 seats onto the rim discharge outlet 4b, and the rim drain valve 8 closes. As a result, the discharge of rim water from the rim discharge outlet 2c stops. Also, at time t4 when the rim discharge stops, the water level W in the bowl section 2a returns to the water level in the standby state.

[0072] Furthermore, in this embodiment, water discharge from the rim outlet 2c is continuously performed by the hydrostatic pressure of the flushing water in the flushing water tank body 4, from the opening of the rim drain valve 8 (time t1 in Figure 6) to its closing (time t4 in Figure 6). Therefore, the instantaneous flow rate of the flushing water discharged from the rim outlet 2c decreases as the water level in the flushing water tank body 4 decreases, so it is highest at the start of discharge and then gradually decreases. In the flush toilet device 1 of this embodiment, the instantaneous flow rate at the start of rim discharge is approximately 11 [L / min], and the instantaneous flow rate at the end of rim discharge is approximately 8 [L / min]. Thus, in the flush toilet device 1 of this embodiment, rim discharge at an appropriate instantaneous flow rate is maintained for a long period of time. In addition, in the flush toilet device 1 of this embodiment, the total amount of flushing water discharged from the rim outlet 2c and the jet outlet 2d is approximately 3.8 [L].

[0073] Furthermore, even after the rim drain valve 8 is closed, the main valve body 20a of the ball tap 16 remains open, so the cleaning water supplied from the water source 6 (water supply) flows into the inner tank 14 from the water supply pipe 32 via the ball tap 16 and the hydraulic drive mechanism 18. As a result, the water level in the inner tank 14 rises. Then, at time t5 in Figure 6, when the inner tank 14 is full, the cleaning water that has flowed into the inner tank 14 from the water supply pipe 32 overflows and flows into the cleaning water tank body 4. As a result, the water level in the cleaning water tank body 4 begins to rise.

[0074] Next, when the water level in the cleaning water tank body 4 rises to a predetermined level, the float 22 of the ball tap 16 rises, and the pilot valve (not shown) closes. When the pilot valve closes in this way, the pressure in the pressure chamber 20d increases. Then, at time t6 in Figure 6, the pressure in the pressure chamber 20d presses the main valve body 20a against the valve seat 20b, and the main valve body 20a closes. As a result, the water supply from the water source 6 to the hydraulic drive mechanism 18 via the ball tap 16 stops, and the supply of cleaning water to the inner tank 14 stops.

[0075] When the water supply to the hydraulic drive mechanism 18 is stopped, the piston 18b (Figure 5) inside the cylinder 18a, which had been pushed up by the water supply, is pushed down by the biasing force of the spring 18c. Consequently, the rod 28 attached to the piston 18b also lowers. When the rod 28 has lowered to a predetermined position, the clutch mechanism 30 reconnects the rod 28 to the valve shaft 10a of the jet drain valve 10. With this, one toilet flush is completed, and the flush toilet device 1 returns to the toilet flush standby state.

[0076] In the flush toilet device 1 of the embodiment of the present invention, flushing water from the flushing water tank body 4 is discharged from the rim outlet 2c via the rim drain valve 8 and the rim water conduit 2e, and flushing water is discharged from the jet outlet 2d via the jet drain valve 10 and the jet water conduit 2f. Therefore, the amount of flushing water discharged from the rim outlet 2c and the amount of flushing water discharged from the jet outlet 2d can be controlled independently, ensuring a sufficient amount of water discharged from the rim and thoroughly cleaning the bowl portion 2a. Furthermore, since the cross-sectional area of ​​the rim outlet 2c is smaller than the cross-sectional area of ​​the jet outlet 2d, even if sufficient water discharge time from the rim outlet 2c is ensured, the amount of flushing water used does not increase significantly, thus achieving water conservation.

[0077] Furthermore, in the flush toilet device 1 of this embodiment, the rim water channel 2e is configured such that the rim outlet 2c is at the lowest position in the path from the rim drain valve 8 to the rim outlet 2c (Figure 3). As a result, the flushing water discharged via the rim drain valve 8 is discharged from the rim outlet 2c without taking a roundabout route. Consequently, the instantaneous flow rate of the flushing water discharged from the rim outlet 2c rises quickly, and a sufficient flushing effect can be obtained even if the discharge time is reduced.

[0078] Furthermore, according to the flush toilet device 1 of this embodiment, the jet drain valve 10 is opened after a predetermined time has elapsed after the rim drain valve 8 is opened (time t2 in Figure 6). As a result, after the bowl section 2a is cleaned by the rim discharge, the siphon action is activated by the jet discharge, allowing the flushing water to be efficiently distributed for cleaning the bowl surface and for the discharge of waste. In addition, since the discharge of flushing water from the rim outlet 2c continues even after the jet drain valve 10 is closed (times t3-t4 in Figure 6), the water discharged from the rim outlet 2c can be used to refill the bowl section 2a.

[0079] Furthermore, according to the flush toilet device 1 of this embodiment, the instantaneous flow rate of the flushing water discharged from the rim outlet 2c is highest at the start of discharge and then gradually decreases (Figure 7). Therefore, after the siphon action is activated by the jet discharge, the instantaneous flow rate of the flushing water from the rim outlet 2c has decreased. As a result, the siphon effect is shortened after the waste is discharged by the siphon action, which suppresses the unnecessary discharge of flushing water into the drain trap pipe 2b and allows for efficient use of the flushing water.

[0080] Furthermore, according to the flush toilet device 1 of this embodiment, since the flush toilet body 2 is equipped with one rim outlet 2c, the total cross-sectional area of ​​the rim outlet 2c can be easily set to be small, and the amount of flushing water used can be reduced while the discharge time of flushing water from the rim outlet 2c can be extended.

[0081] Furthermore, according to the flush toilet device 1 of this embodiment, the rim drain valve 8 is located further outward in the width direction of the flush toilet body 2 than the jet drain valve 10, and the rim water channel 2e extends to the rim outlet 2c, passing further outward in the width direction of the flush toilet body 2 than the seat hole 2g provided on the upper surface of the flush toilet body 2 (Figure 1). As a result, while securing sufficient space for the jet water channel 2f within the flush toilet body 2, the rim water channel 2e connecting the rim drain valve 8 and the rim outlet 2c can be made shorter, allowing rim water discharge to start earlier.

[0082] The flush toilet device according to an embodiment of the present invention has been described above, but various modifications can be made to the above-described embodiment. In particular, in the above-described embodiment, the jet drain valve 10 was opened after the rim drain valve 8 was opened by using the water pressure drive mechanism 18 to open the jet drain valve 10. In contrast, as a modification, the rim drain valve 8 and / or the jet drain valve 10 may be configured to be opened using the power of a motor (not shown), and the motor may be operated so that the jet drain valve 10 opens with a delay. Alternatively, the rim drain valve 8 and the jet drain valve 10 may be configured to be lifted by a ball chain or the like connected to the lever handle 4a, and the ball chain or the like attached to the jet drain valve 10 may be made longer so that the jet drain valve 10 opens after the rim drain valve 8 is opened. [Explanation of Symbols]

[0083] 1 Flush toilet device 2 Flush toilet body 2a Bowl section 2b Drain trap pipe 2c Rim spout 2D Jet Spout 2e Rim water conduit 2F Jet Waterway 2g sheet hole 4. Washing water tank body 4a Lever handle 4b Rim drain outlet for water discharge 4c Drain outlet for jet water discharge 6 Water source 8. Drain valve for rim 8a Jade chain 10. Drain valve for jet 10a valve stem 14 Inner Tank 14a Outlet 14b Drain opening forming member 15. Overflow pipe (exhaust path) 16. Ball tap (water supply valve) 16a Inlet pipe 16b Outflow pipe 18 Hydraulic drive mechanism 18a Cylinder 18b Piston 18c spring 20 Main body 20a Main valve body 20b Valve seat 20°C pressure chamber 22 Floats 24 Arm section 28 rods 30 Clutch mechanism 32 Water supply pipe

Claims

1. A flush toilet device that performs flushing using flushing water stored in a flushing water tank, A flush toilet body comprising a bowl section and a drain trap pipe extending from the lower part of the bowl section, This flush toilet unit includes a flush water tank that stores flush water for cleaning the bowl portion, A rim drain valve is provided in the flushing water tank body and controls the discharge and stopping of flushing water stored in the flushing water tank body from one or more rim outlets provided in the flushing toilet body, A jet drain valve is provided in the flushing water tank body and controls the discharge and stopping of flushing water stored in the flushing water tank body from the jet outlet provided in the flush toilet body, A rim water channel is provided in the toilet bowl body described above, which guides the flushing water discharged via the rim drain valve to one or more rim outlets, A jet water channel is provided in the toilet bowl body described above, which guides the flushing water discharged via the jet drain valve to the jet outlet, It has, The sum of the cross-sectional areas of one or more of the above-mentioned rim outlets is smaller than the cross-sectional area of ​​the above-mentioned jet outlet. A flush toilet device characterized in that the jet drain valve is opened after a predetermined time has elapsed after the rim drain valve is opened, and the discharge of flushing water from one or more rim outlets continues even after the jet drain valve is closed.

2. The flush toilet device according to claim 1, wherein the rim water channel is a path from the rim drain valve to the one or more rim outlets, and the one or more rim outlets are all located at the lowest position.

3. The flush toilet device according to claim 1, wherein the instantaneous flow rate of the flushing water discharged from one or more rim outlets is greatest at the start of discharge and then gradually decreases.

4. The flush toilet device according to claim 1, wherein the flush toilet body is equipped with one rim spout.

5. The flush toilet device according to claim 4, wherein the rim drain valve is located further outward in the width direction than the jet drain valve, and the rim water channel extends to the rim water outlet, passing further outward in the width direction than the seat hole provided on the upper surface of the flush toilet body.

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