A flushing water tank device, and a flush toilet device equipped therewith.

Abstract

To provide a flush water tank device capable of sufficiently utilizing a volume in a flush water tank and a water head pressure of flush water in the flush water tank for toilet cleaning.SOLUTION: A flush water tank device (4) of the present invention comprises a flush water tank main body (12) provided with a first tank part (13) and a second tank part (15) for storing flush water, a rim water discharge switching mechanism (8) for switching discharge and stop of the flush water in the first tank part, and a jet water discharge drain valve (10) for switching discharge and stop of the flush water in the second tank part. The first tank part and the second tank part are configured to have different cross-sectional areas according to height, and a ratio of cross-sectional areas of the first tank part and the second tank part at a first height is different from a ratio of the cross-sectional areas at a second height lower than the first height.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a washing water tank device, and particularly to a washing water tank device attached to a flush toilet main body to supply washing water, and a flush toilet device provided with the same.

Background Art

[0002] Chinese Patent Application Publication No. CN103967088 (Patent Document 1) describes a toilet water tank device. In this toilet water tank device, a partition formed by a vertical wall surface is provided inside the water tank, and a first water tank and a second water tank are constituted by this partition. A first drain valve and a second drain valve are respectively provided in these first water tank and second water tank, and the washing water in the first water tank and the washing water in the second water tank are respectively configured to be supplied to the flush toilet.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the toilet water tank device described in Patent Document 1, when the first drain valve is opened, the washing water is discharged by the head pressure of the washing water in the first water tank, and when the second drain valve is opened, the washing water is discharged by the head pressure of the washing water in the second water tank. However, in the toilet water tank device described in Patent Document 1, since the water tank is simply partitioned into the first water tank and the second water tank, there is a problem that the volume of the water tank and the head pressure of the washing water in the water tank cannot be fully utilized for toilet washing.

[0005] Therefore, the present invention aims to provide a flushing water tank device that can fully utilize the volume of the flushing water tank and the hydrostatic pressure of the flushing water in the flushing water tank for flushing the toilet bowl, and a flushing toilet device equipped therewith. [Means for solving the problem]

[0006] To solve the above-mentioned problems, the present invention provides a flush water tank device that is attached to a flush toilet body for supplying flush water, comprising: a flush water tank body having a first tank section and a second tank section for storing flush water to be supplied to the flush toilet body; a rim discharge switching mechanism for switching the discharge and stopping of flush water in the first tank section so that the flush water in the first tank section is discharged from the rim discharge port of the flush toilet body; and a jet discharge drain valve for switching the discharge and stopping of flush water in the second tank section so that the flush water in the second tank section is discharged from the jet discharge port of the flush toilet body, wherein the first tank section and the second tank section are configured to have different cross-sectional areas according to their height, and the ratio of the cross-sectional areas of the first tank section and the second tank section at a first height is different from the ratio of the cross-sectional areas at a second height which is lower than the first height.

[0007] Thus, in the present invention, the first tank section and the second tank section are configured to have different cross-sectional areas depending on the height, and the ratio of the cross-sectional areas of the first tank section and the second tank section at the first height is different from the ratio of the cross-sectional areas at the second height, which is lower than the first height. With the present invention configured in this way, for example, if the cross-sectional area of ​​the second tank section is large at the first height and small at the second height, a large amount of flushing water can be discharged from the jet outlet with a high hydrostatic pressure in the initial stages of flushing. In other words, according to the present invention, it is possible to distribute the flushing water in the flushing water tank body to the rim outlet and jet outlet of the toilet body in accordance with the required amount of flushing water and water pressure. As a result, the volume in the flushing water tank body and the hydrostatic pressure of the flushing water in the flushing water tank body can be fully utilized for flushing the toilet.

[0008] In the present invention, preferably, the second tank section is configured to have a cross-sectional area at a first height that is greater than or equal to the cross-sectional area of ​​the first tank section.

[0009] With the present invention configured in this way, the second tank section is configured to have a cross-sectional area greater than or equal to the cross-sectional area of ​​the first tank section at the first height. Therefore, in the initial stages of flushing when the water level in the second tank section is high, the instantaneous flow rate of flushing water discharged from the jet nozzle of the toilet bowl can be increased, thereby enhancing the flushing effect.

[0010] In the present invention, preferably, the second tank section includes a stepped section provided at a height between the first height and the second height, and the second tank section is configured such that its cross-sectional area is reduced below the stepped section, while the first tank section is configured such that its cross-sectional area is increased below the stepped section.

[0011] With the present invention configured in this way, the second tank section is configured to have a reduced cross-sectional area below the stepped section, while the first tank section is configured to have a larger cross-sectional area below the stepped section. As a result, the instantaneous flow rate from the jet outlet can be increased in the initial stages of cleaning, and at the same time, sufficient volume can be secured in the first tank section below the height of the stepped section, allowing a sufficient amount of cleaning water to be allocated to the rim outlet.

[0012] In the present invention, preferably, an inner tank is arranged inside the washing water tank body, the second tank section is formed inside the inner tank, and the first tank section is formed inside the washing water tank body and outside the inner tank.

[0013] According to the present invention configured in this way, an inner tank is placed inside the washing water tank body, a second tank section is formed inside the inner tank, and a first tank section is formed inside the washing water tank body and outside the inner tank. Therefore, the cross-sectional area at each height of the first and second tank sections can be freely set, and the washing water volume and hydrostatic pressure can be freely set according to requirements.

[0014] In the present invention, preferably, the jet discharge drain valve is configured to discharge the cleaning water in the second tank so that the water level in the second tank drops from a predetermined initial water level to a predetermined jet dead water level, and the stepped portion is provided at a position lower than the jet dead water level.

[0015] With the present invention configured in this way, since the height of the step where the cross-sectional area of ​​the second tank section is reduced is set lower than the jet dead water level, the flow rate of the cleaning water discharged from the jet outlet can be maintained at a sufficiently high level until discharge is completed.

[0016] In the present invention, preferably, the rim water discharge switching mechanism is configured to discharge the cleaning water in the first tank so that the water level in the first tank decreases from a predetermined initial water level to a predetermined rim dead water level, and the stepped portion is provided at a position higher than the rim dead water level.

[0017] With the present invention configured in this way, since the stepped portion that enlarges the cross-sectional area of ​​the first tank is provided at a position higher than the rim dead water level, the cleaning water stored below the stepped portion of the first tank can be discharged from the rim outlet, and a sufficient amount of cleaning water can be discharged from the rim outlet.

[0018] In the present invention, preferably, the first tank section and the second tank section are configured such that the ratio of their cross-sectional areas is reversed at the first height and the second height.

[0019] With the present invention configured in this way, the ratio of the cross-sectional area of ​​the first tank section and the second tank section is reversed at the first height and the second height, so that the instantaneous flow rate of cleaning water discharged from either the jet outlet or the rim outlet can be increased while simultaneously ensuring a sufficient amount of cleaning water discharged from the other.

[0020] The present invention also relates to a flushing toilet device that is flushed with flushing water stored in a flushing water tank, and is characterized by comprising a flushing toilet main body provided with a bowl portion, a rim water outlet, and a jet water outlet, and a flushing water tank device of the present invention that supplies flushing water to the rim water outlet and the jet water outlet of the flushing toilet main body.

Effects of the Invention

[0021] According to the flushing water tank device of the present invention and the flushing toilet device provided with the same, the volume in the flushing water tank and the water head pressure of the flushing water in the flushing water tank can be fully utilized for toilet flushing.

Brief Description of the Drawings

[0022] [Figure 1] It is a block diagram showing the overall configuration of a flushing toilet device according to an embodiment of the present invention. [Figure 2] It is a top view showing the schematic configuration of a flushing toilet device according to an embodiment of the present invention. [Figure 3] It is a front sectional view showing the schematic configuration of a flushing water tank device provided in a flushing toilet device according to an embodiment of the present invention. [Figure 4] It is a sectional view showing the structure of a ball tap built in a flushing water tank device according to an embodiment of the present invention. [Figure 5] It is a sectional view showing the structure of a hydraulic drive mechanism built in a flushing water tank device according to an embodiment of the present invention. [Figure 6] It is a horizontal sectional view of a flushing water tank device according to an embodiment of the present invention at the height H1 in FIG. 3. [[ID=3I]] [Figure 7] It is a horizontal sectional view of a flushing water tank device according to an embodiment of the present invention at the height H2 in FIG. 3. <0000IOO>It is a time chart showing the operation of a flushing toilet device according to an embodiment of the present invention.

Modes for Carrying Out the Invention

[0023] <OOO0106>Next, with reference to the attached drawings, a flushing water tank device according to an embodiment of the present invention and a flush toilet device equipped therewith will be described. Figure 1 is a block diagram showing the overall configuration of a flush toilet device according to an embodiment of the present invention. Figure 2 is a top view showing the schematic configuration of a flush toilet device according to an embodiment of the present invention. Figure 3 is a front cross-sectional view showing the schematic configuration of a flush water tank device provided in a flush toilet device according to an embodiment of the present invention. Figure 4 is a cross-sectional view showing the structure of a ballcock built into the flush water tank device according to an embodiment of the present invention. Figure 5 is a cross-sectional view showing the structure of a water pressure drive mechanism built into the flush water tank device according to an embodiment of the present invention. Figure 6 is a horizontal cross-sectional view of the flush water tank device at height H1 in Figure 3. Figure 7 is a horizontal cross-sectional view of the flush water tank device at height H2 in Figure 3.

[0024] As shown in Figures 1 and 2, the flush toilet device 1 according to an embodiment of the present invention consists of a flush toilet body 2 and a flush water tank device 4 located at the rear of the flush toilet body 2. The flush toilet device 1 of this embodiment is configured so that after use, flushing is performed by operating a lever handle 4a provided on the flush water tank device 4.

[0025] 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).

[0026] The cleaning water tank device 4 is supplied with cleaning water from a water source 6, such as a water supply, and the supplied cleaning water is stored inside the cleaning water tank device 4. The cleaning water tank device 4 also incorporates a rim water discharge drain valve 8 and a jet water discharge drain valve 10, which are switching mechanisms for rim water discharge and are configured to open and close drain ports located at the bottom of the cleaning water tank device 4.

[0027] In this embodiment, by opening the rim water discharge valve 8, flushing water is discharged from the rim water outlet 2c through the rim water channel 2e formed inside the toilet bowl body 2. Also, by opening the jet water discharge valve 10, flushing water is discharged from the jet water outlet 2d through the jet water channel 2f formed inside the toilet bowl body 2.

[0028] Next, the internal structure of the cleaning water tank device 4 will be described with reference to Figures 2 and 3. As shown in Figures 2 and 3, the cleaning water tank device 4 includes a cleaning water tank body 12, an inner tank 14 located inside the cleaning water tank body, a rim discharge drain valve 8 located inside the cleaning water tank body 12, a jet discharge 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.

[0029] The flushing water tank body 12 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 12 is made of ceramic, and the inner tank 14, which is located inside the flushing water tank body 12, is made of resin. In this embodiment, the space inside the flushing water tank body 12 and outside the inner tank 14 constitutes the first tank section 13, and the space inside the inner tank 14 constitutes the second tank section 15. Therefore, in this embodiment, the flushing water tank body 12 is provided with a first tank section 13 and a second tank section 15 for storing flushing water to be supplied to the flush toilet body 2.

[0030] As shown in Figure 3, the bottom surface of the flushing water tank body 12 is provided with a first drain port 12a and a second drain port 12b, and in this embodiment, these drain ports are circular in shape. Here, the flushing water stored in the first tank section 13 (inside the flushing water tank body 12 and outside the inner tank 14) flows through the first drain port 12a into the rim water channel 2e of the flush toilet body 2 and is discharged from the rim water outlet 2c. The flushing water stored in the second tank section 15 (inside the inner tank 14) flows through the second drain port 12b into the jet water channel 2f of the flush toilet body 2 and is discharged from the jet water outlet 2d.

[0031] The inner tank 14 is positioned on the bottom surface of the flushing water tank body 12, and the lower part of the inner tank 14 is submerged in the flushing water stored in the flushing water tank body 12. 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 second drain outlet 12b provided in the flushing water tank body 12. That is, in this embodiment, the center of the circular second drain outlet 12b and the circular outlet 14a coincide when viewed from above. Therefore, the flushing water in the inner tank 14 flows into the jet water channel 2f of the flush toilet body 2 through the outlet 14a of the inner tank 14 and the second drain outlet 12b of the flushing water tank body 12.

[0032] Furthermore, as shown in Figure 3, 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 water discharge drain valve 10 is seated on this seat surface. Therefore, in this embodiment, the seat surface on which the jet water discharge drain valve 10 is seated is made of a separate component from the inner tank 14.

[0033] Furthermore, as shown in Figure 2, the flushing water tank body 12 of the flushing water tank device 4 is configured in a roughly rectangular shape when viewed from above, with the width direction (direction of arrow W in Figure 2) being longer and the depth direction (direction of arrow D in Figure 2) being shorter. In addition, the inner tank 14, which is located inside the flushing water tank body 12, is also configured in a way that the width direction is longer and the depth direction is shorter when viewed from above, and is also made to have an irregular shape to avoid the rim water discharge valve 8 and the ball tap 16.

[0034] Specifically, in this embodiment, a ball tap 16 is located at the front left end (lower left corner in Figure 2) of the cleaning water tank body 12, and a rim discharge drain valve 8 is located at the front right end (lower right corner in Figure 2). The inner tank 14 has notches 14c and 14d at both ends in the width direction when viewed from above, so as to avoid the ball tap 16 and the rim discharge drain valve 8. That is, a U-shaped notch 14c is provided in the inner tank 14 where the rim discharge drain valve 8 is located in the cleaning water tank body 12, and a notch 14d is provided where the ball tap 16 is located, so as not to interfere with the inner tank 14.

[0035] On the other hand, as shown in Figure 3, stepped portions 14e are formed on both sides of the inner tank 14 in the width direction, and the width below the stepped portions 14e is narrower. That is, the inner tank 14 is formed in a roughly T-shape when viewed from the front, and the horizontal cross-sectional area A2 (Figures 6 and 7) is configured to be constant above and below the stepped portions 14e, respectively. In other words, the second tank section 15, which is the space inside the inner tank 14, and the first tank section 13, which is the space outside, are configured to have different horizontal cross-sectional areas depending on their height. That is, the second tank section 15 is configured so that the horizontal cross-sectional area A2 decreases below the stepped portions 14e. On the other hand, the first tank section 13 is configured so that the horizontal cross-sectional area A1 increases below the stepped portions 14e.

[0036] As a result, in this embodiment, the ratio of the horizontal cross-sectional areas of the first tank section 13 and the second tank section 15 at a first height H1 above the stepped section 14e (A1 / A2 in Figure 6) is different from the ratio of the horizontal cross-sectional areas of the first tank section 13 and the second tank section 15 at a second height H2 below both the first height H1 and the stepped section 14e (A1 / A2 in Figure 7). In this embodiment, as shown in Figure 6, at the first height H1 above the stepped section 14e, the horizontal cross-sectional area A2 of the second tank section 15 is larger than the horizontal cross-sectional area A1 of the first tank section 13. On the other hand, as shown in Figure 7, at the second height H2 below the stepped section 14e, the horizontal cross-sectional area A1 of the first tank section 13 is larger than the horizontal cross-sectional area A2 of the second tank section 15. Therefore, in this embodiment, the ratio of the horizontal cross-sectional areas of the first tank section 13 and the second tank section 15 is reversed at the first height H1 and the second height H2.

[0037] Furthermore, during actual use of the cleaning water tank device 4, cleaning water is stored in the second tank section 15 up to above the stepped section 14e of the inner tank 14. Therefore, in this embodiment, the inner tank 14 is submerged in the cleaning water stored in the first tank section 13 up to above the stepped section 14e. In this embodiment, by making the upper part of the second tank section 15 large, a large amount of cleaning water with high potential energy is stored in the second tank section 15. This makes it possible to increase the hydrostatic pressure of the cleaning water discharged from the second tank section 15, and to increase the instantaneous flow rate of cleaning water discharged from the jet outlet 2d.

[0038] Furthermore, by constructing the inner tank 14 in an irregular shape using resin, sufficient volume is secured in the inner tank 14 while keeping the depth dimension of the washing water tank device 4 down. In addition, since the inner tank 14 made of resin can have thinner walls than when it is made of ceramic, the volume inside the washing water tank body 12 can be used effectively.

[0039] Next, the rim water discharge drain valve 8, which is a switching mechanism for rim water discharge, is a valve body positioned to open and close the first drain port 12a provided in the flush water tank body 12. When the rim water discharge drain valve 8 is pulled upward, the first drain port 12a is opened. As a result, the flush water in the first tank section 13 is discharged into the rim water channel 2e (Figure 1) of the toilet bowl body 2 and discharged from the rim water outlet 2c. Therefore, the rim water discharge drain valve 8, which is a switching mechanism for rim water discharge, switches between discharging the flush water stored in the first tank section 13 to the toilet bowl body 2 and stopping the discharge.

[0040] In this embodiment, the user rotates a lever handle 4a provided on the cleaning water tank device 4, which pulls the ball chain 8a (Figure 3) connected to the rim water discharge valve 8, thereby raising the rim water discharge valve 8. As a modification, the present invention can also be configured so that the rim water discharge 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).

[0041] Furthermore, in this embodiment, a drain valve 8 for rim water discharge is provided as a rim water discharge switching mechanism, but other components can be used as the rim water discharge switching mechanism. For example, a jet pump (not shown) that flows the flushing water stored in the first tank section 13 into the toilet bowl body can be used as the rim water discharge switching mechanism. In this case, the nozzle (not shown) of the jet pump is placed inside the first tank section 13, and a portion of the flushing water supplied via a water supply valve such as a ballcock 16 is ejected from this nozzle. By ejecting the flushing water from the nozzle inside the first tank section 13, the flushing water stored inside the first tank section 13 is drawn in, and the flushing water in the first tank section 13 can be made to flow into the toilet bowl body by the action of the jet pump. In addition to such a jet pump (not shown), any configuration that switches between discharging and stopping the flushing water to the toilet bowl body 2 can be used as the rim water discharge switching mechanism.

[0042] Next, the jet water discharge drain valve 10 is a valve body positioned to open and close the outlet 14a provided in the inner tank 14. By pulling the jet water discharge drain valve 10 upward, the jet water discharge drain valve 10 is separated from the seat surface of the outlet 14a, and the outlet 14a is opened. As a result, the flushing water in the second tank section 15 is discharged from the outlet 14a, passes through the second drain outlet 12b, flows into the jet water channel 2f (Figure 1) of the toilet body 2, and is discharged from the jet water outlet 2d. Therefore, the jet water discharge drain valve 10 switches between discharging and stopping the flushing water stored in the second tank section 15 to the toilet body 2.

[0043] Furthermore, in this embodiment, the jet water discharge drain valve 10 is configured to be pulled up from the outlet 14a by a hydraulic drive mechanism 18. That is, the jet water discharge 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 water discharge 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, but the present invention can also be applied to a washing water tank device that is not equipped with a hydraulic drive mechanism 18.

[0044] 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 first tank section 13 and the second tank section 15.

[0045] Next, the configuration of the ball tap 16 will be explained with reference to Figure 4. As shown in Figure 4, the ball tap 16 includes a main body 20 to which the inlet pipe 16a and outlet pipe 16b are connected, a main valve body 20a disposed within the main body 20, a valve seat 20b on which the main valve body 20a sits, an arm portion 24 rotated by a float 22, and a pilot valve 26 moved by the rotation of the arm portion 24. In other words, the ball tap 16 is equipped with a float 22 that operates in conjunction with the water level in the cleaning water tank device 4, and is configured to supply cleaning water to the hydraulic drive mechanism 18 when the float 22 drops to a predetermined position.

[0046] The main body 20 is a component with a connection part for the inlet pipe 16a at its lower end and a connection part for the outlet pipe 16b on one side. A valve seat 20b is formed inside the main body 20, and this valve seat 20b is configured to communicate with the outlet pipe 16b connected to the connection part. Furthermore, a main valve body 20a is positioned inside the main body 20 to open and close the valve seat 20b, and 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 a water pressure drive mechanism 18.

[0047] The main valve body 20a is a generally disc-shaped diaphragm-type valve body and is mounted inside the main body 20 so that it can seat on and off with respect to the valve seat 20b. A bleed hole 20c is also provided on the periphery of the main valve body 20a. Furthermore, a pressure chamber 20d is formed inside the main body 20 on the opposite side of the valve seat 20b (the left side in Figure 4) from the main valve body 20a. That is, the pressure chamber 20d is defined by the inner wall surface of the main body 20 and the main valve body 20a, and when the pressure inside this pressure chamber 20d increases, this pressure presses the main valve body 20a against the valve seat 20b, causing it to seat on the valve seat 20b.

[0048] Furthermore, a pressure passage 20e extends upward from a pressure chamber 20d located within the main body 20, communicating with it, and a pilot valve port 26a is provided at the upper end of this pressure passage 20e. This pilot valve port 26a opens upward and is configured to be opened and closed by a pilot valve 26.

[0049] On the other hand, the float 22 is supported by an arm portion 24, which is rotatably supported by a support shaft 24a. Furthermore, a pilot valve 26 is connected to the arm portion 24, and the pilot valve 26 is configured to move vertically as the arm portion 24 rotates. In this embodiment, the float 22 is placed in the second tank portion 15 and moves vertically according to the water level in the second tank portion 15. As a result, when the water level in the second tank portion 15 rises above a predetermined level, the float 22 is pushed upward, and the pilot valve 26 moves downward accordingly, seats in the pilot valve port 26a, and closes the valve. On the other hand, when the cleaning water in the second tank portion 15 is drained and the water level drops, the float 22 moves downward, the pilot valve 26 moves upward, and the pilot valve port 26a opens. Therefore, when the toilet is in standby mode and the water level in the flushing water tank body 12 is higher than a predetermined level, the pilot valve port 26a of the main body 20 is in a closed state.

[0050] Furthermore, tap water that flows into the main body 20 from the inlet pipe 16a flows into the annular space around the valve seat 20b, and from there flows into the pressure chamber 20d through the bleed hole 20c of the main valve body 20a. Here, when the pilot valve port 26a is closed by the pilot valve 26, there is no path for the tap water that has flowed into the pressure chamber 20d from the bleed hole 20c to flow out, and the pressure in the pressure chamber 20d rises. When the pressure in the pressure chamber 20d rises in this way, this pressure pushes the main valve body 20a toward the valve seat 20b (to the right in Figure 4), and the valve seat 20b is closed by the main valve body 20a.

[0051] On the other hand, when the rim discharge valve 8 is opened by the cleaning operation and the water level in the first tank section 13 falls below a predetermined level, the float 22 lowers, the pilot valve 26 moves upward, and the pilot valve port 26a opens. When the pilot valve port 26a opens, water in the pressure chamber 20d flows out through the pilot valve port 26a, and the pressure in the pressure chamber 20d decreases. As a result, the main valve body 20a moves away from the valve seat 20b (to the left in Figure 4), and the valve seat 20b opens. In this way, when the pilot valve port 26a is open, the pressure in the pressure chamber 20d does not rise, and the valve seat 20b remains open.

[0052] 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 water discharge drain valve 10 using the water supply pressure of the cleaning water supplied from the water tap to the cleaning water tank device 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 water discharge 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 water discharge drain valve 10.

[0053] 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.

[0054] 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.

[0055] The water supply pipe 32 is a pipe that extends downward from an outlet hole provided at the upper end of the cylinder 18a. The cleaning water that flows out from the cylinder 18a flows into the second tank section 15 from the water inlet 32a at the lower end of the water supply pipe 32. This water inlet 32a at the lower end of the water supply pipe 32 is located below the water level of the cleaning water in the second tank section 15 when it is in standby mode. Therefore, the ball tap 16 is configured to allow cleaning water to flow into the second tank section 15 from the water inlet 32a, which is located below the water level of the second tank section 15.

[0056] 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 water discharge 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 water discharge 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 water discharge drain valve 10 upward, and the jet water discharge drain valve 10 opens.

[0057] 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 flowing into the cylinder 18a flows out through this gap. The water that flows out through the gap flows into the second tank section 15. 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.

[0058] Furthermore, the clutch mechanism 30 detachably connects the rod 28 and the jet water discharge drain valve 10. When the jet water discharge 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 water discharge drain valve 10 from the rod 28. When the clutch mechanism 30 is disconnected, the jet water discharge drain valve 10 is no longer linked to the movement of the piston 18b and the rod 28, and the jet water discharge drain valve 10 descends along with the decrease in the water level in the second tank section 15, closing the outlet 14a of the inner tank 14.

[0059] Next, with reference to Figure 8, the operation of the flush toilet device 1 according to an embodiment of the present invention will be explained. Figure 8 is a time chart showing the operation of the flush toilet device 1 according to an embodiment of the present invention, and from top to bottom, it shows the state of jet water discharge, rim water discharge, and ballcock.

[0060] First, in the standby state for toilet flushing, the first drain port 12a of the flushing water tank body 12 and the discharge port 14a of the inner tank 14 are closed by the rim discharge drain valve 8 and the jet discharge drain valve 10, respectively. Also in the standby state, flushing water is stored in the first tank section 13 and the second tank section 15 up to a predetermined initial water level. In this embodiment, the initial water level of the first tank section 13 is set higher than the stepped section 14e of the inner tank 14. Thus, when the first tank section 13 is at the initial water level, the pilot valve port 26a of the main body 20 (Figure 4) of the ballcock 16 is closed, and the valve seat 20b is closed by the main valve body 20a. On the other hand, in this embodiment, the initial water level of the second tank section 15 is at approximately the same height as the upper edge of the inner tank 14, and is higher than the initial water level of the first tank section 13.

[0061] Next, at time t1 in Figure 8, when the user rotates the lever handle 4a (Figure 3) of the flushing water tank device 4 to flush the toilet, the ball chain 8a connected to it pulls up the rim water discharge valve 8. This separates the rim water discharge valve 8 from the first drain port 12a, and the first drain port 12a opens. When the first drain port 12a opens, the flushing water stored in the second tank section 15 flows from the first drain port 12a into the rim water channel 2e (Figure 2) 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.

[0062] As the cleaning water is discharged from the first drain port 12a, the water level in the second tank section 15 decreases. This causes the float 22 of the ball tap 16 to drop, opening the pilot valve 26 (Figure 4). This reduces the pressure in the pressure chamber 20d, opening the main valve body 20a, and allowing the cleaning water to be supplied to the hydraulic drive mechanism 18 through the outlet pipe 16b.

[0063] When cleaning water is supplied to the hydraulic drive mechanism 18, the cleaning water flowing into the cylinder 18a (Figure 5) 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 water discharge drain valve 10, opening the outlet 14a of the inner tank 14. In other words, the jet water discharge drain valve 10 is driven and opened by the water supply pressure of the tap water supplied via the ball tap 16.

[0064] As a result, at time t2 in Figure 8, the outlet 14a is opened, and the cleaning water stored in the second tank section 15 flows through the outlet 14a and the second drain outlet 12b into the jet water channel 2f (Figure 2), and is discharged from the jet outlet 2d. 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).

[0065] In this state, when the outlet 14a is closed, the inside of the jet water conduit 2f is filled with cleaning water up to the height of the water level in the bowl section 2a, and there is no cleaning water in the space above this water level. Therefore, before the jet water discharge valve 10 is opened, there is no cleaning water at the upstream end of the jet water conduit 2f.

[0066] When the jet discharge drain valve 10 is opened, the space in the jet water conduit 2f that does not contain cleaning water is filled with water in a short time, and cleaning water can be discharged from the jet outlet 2d at an early stage. In particular, in this embodiment, the cross-sectional area above the stepped portion 14e of the inner tank 14 (cross-sectional area A2 in Figure 6) is larger than the cross-sectional area below it (cross-sectional area A2 in Figure 7), so the second tank section 15 has a large volume at a high position. As a result, a large amount of cleaning water with high hydrostatic pressure can be introduced into the jet water conduit 2f, and the instantaneous flow rate of cleaning water discharged from the jet outlet 2d can be increased.

[0067] Meanwhile, when the jet discharge 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 discharge drain valve 10 from the rod 28. As a result, the jet discharge drain valve 10 descends towards the outlet 14a as the water level in the second tank section 15 decreases. Then, at time t3 in Figure 8, when the water level in the second tank section 15 drops to a predetermined jet dead water level JWL (Figure 3), the jet discharge drain valve 10 seats at the outlet 14a, and the outlet 14a is closed. As a result, the jet discharge from the jet outlet 2d stops.

[0068] Furthermore, in this embodiment, the jet dead water level JWL is set above the stepped portion 14e of the inner tank 14. Therefore, the cleaning water discharged from the jet outlet 2d is the cleaning water stored at a relatively high position in the second tank section 15. Consequently, a relatively high hydrostatic pressure acts on the cleaning water discharged from the jet outlet 2d, enabling a powerful, high-flow jet discharge. In addition, since the horizontal cross-sectional area A2 is large above the stepped portion 14e of the inner tank 14, a large amount of cleaning water can be secured for jet discharge.

[0069] 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 second tank section 15 through the water supply pipe 32 (Figure 5) connected to the cylinder 18a. Here, when the jet discharge drain valve 10 is open, the flow rate of cleaning water flowing out from the outlet 14a of the inner tank 14 is greater than the flow rate of cleaning water flowing into the second tank section 15 through the water inlet 32a of the water supply pipe 32, so the water level in the second tank section 15 decreases. Then, after the jet discharge is stopped at time t3 in Figure 8 (after the jet discharge drain valve 10 is closed), the water level in the second tank section 15 rises due to the cleaning water flowing in from the water supply pipe 32.

[0070] Meanwhile, since the rim discharge valve 8 remains open, the cleaning water in the first tank section 13 flows out from the first drain port 12a, and the water level in the first tank section 13 continues to decrease. Then, at time t4 in Figure 8, when the water level in the cleaning water tank body 12 drops to the predetermined rim dead water level RWL (Figure 3), the rim discharge valve 8 seats at the first drain port 12a, and the rim discharge valve 8 closes. As a result, the rim water discharge from the rim discharge port 2c stops.

[0071] Furthermore, in this embodiment, the rim dead water level RWL is set below the stepped portion 14e of the inner tank 14. Therefore, the water discharged from the rim outlet 2c uses cleaning water stored at a relatively low position in the first tank section 13. Consequently, the cleaning water discharged from the rim outlet 2c does not experience a very large hydrostatic pressure. However, since the rim outlet 2c, which opens above the water level in the bowl section 2a, is open to the atmosphere, water can be easily discharged even when the hydrostatic pressure of the cleaning water is low, and the bowl section 2a can be effectively cleaned. In addition, in this embodiment, the cleaning water used for rim discharge ranges from the initial water level above the stepped portion 14e to the rim dead water level RWL below the stepped portion 14e, which is stored in the first tank section 13. Therefore, a large amount of cleaning water can be secured for rim discharge.

[0072] Furthermore, even after the rim water discharge valve 8 is closed, the main valve body 20a of the ball tap 16 remains open, so that the cleaning water supplied from the water source 6 (water supply) flows into the second tank section 15 from the water inlet 32a of the water supply pipe 32 via the ball tap 16 and the water pressure drive mechanism 18.

[0073] As the cleaning water flows in, the water level in the second tank section 15 rises, and when the second tank section 15 is full at time t5 in Figure 8, the cleaning water begins to overflow from the inner tank 14 and flows into the first tank section 13.

[0074] Then, as cleaning water flows into the first tank section 13, the water level in the first tank section 13 begins to rise. Next, when the water level in the first tank section 13 rises to a predetermined initial level, the float 22 of the ball tap 16 rises, and the pilot valve 26 (Figure 4) closes. When the pilot valve 26 is closed in this way, the cleaning water that has flowed into the pressure chamber 20d from the bleed hole 20c provided in the main valve body 20a of the ball tap 16 cannot flow out, and the pressure in the pressure chamber 20d rises. Then, at time t6 in Figure 8, the main valve body 20a is pressed by the pressure in the pressure chamber 20d and seats on 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 is stopped, and the supply of cleaning water to the second tank section 15 is stopped.

[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 water discharge 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 flushing water tank device 4 of the embodiment of the present invention, the first tank section 13 and the second tank section 15 are configured such that their cross-sectional areas A1 and A2 differ depending on their height, and the ratio of the cross-sectional areas of the first tank section 13 and the second tank section 15 at a first height H1 (A1 / A2 in Figure 6) is different from the ratio of the cross-sectional areas at a second height H2 which is lower than the first height H1 (A1 / A2 in Figure 6). For example, as in the embodiment described above, if the cross-sectional area A2 of the second tank section 15 is large at the first height H1 and small at the second height H2, a large amount of flushing water can be discharged from the jet outlet 2d with a high water head pressure at the beginning of flushing. That is, the flushing water in the flushing water tank body 12 can be distributed to the rim outlet 2c and the jet outlet 2d of the flush toilet body 2 according to the required amount of flushing water and water pressure. This allows the volume within the flushing water tank body 12 and the hydrostatic pressure of the flushing water within the flushing water tank body 12 to be fully utilized for flushing the toilet.

[0077] Furthermore, according to the flushing water tank device 4 of this embodiment, the second tank section 15 is configured to have a cross-sectional area greater than or equal to the cross-sectional area A1 of the first tank section 13 at the first height H1. Therefore, in the initial stages of flushing when the water level in the second tank section 15 is high, the instantaneous flow rate of flushing water discharged from the jet outlet 2d of the toilet bowl body can be increased, thereby enhancing the flushing effect.

[0078] Furthermore, according to the cleaning water tank device 4 of this embodiment, the second tank section 15 is configured such that its cross-sectional area A2 decreases below the stepped section 14e, while the first tank section 13 is configured such that its cross-sectional area A1 increases below the stepped section 14e. As a result, the instantaneous flow rate from the jet outlet 2d can be increased in the initial stages of cleaning, and at the same time, sufficient volume can be secured in the first tank section 13 below the height of the stepped section 14e, allowing a sufficient amount of cleaning water to be allocated to the rim outlet 2c.

[0079] Furthermore, according to the cleaning water tank device 4 of this embodiment, an inner tank 14 is placed inside the cleaning water tank body 12, a second tank section 15 is formed inside the inner tank 14, and a first tank section 13 is formed inside the cleaning water tank body 12 and outside the inner tank 14. Therefore, the cross-sectional area at each height of the first tank section 13 and the second tank section 15 can be freely set, and the cleaning water volume and hydrostatic pressure can be freely set according to requirements.

[0080] Furthermore, according to the cleaning water tank device 4 of this embodiment, the height of the stepped portion 14e where the cross-sectional area A2 of the second tank portion 15 is reduced is set lower than the jet dead water level JWL, so the flow rate of cleaning water discharged from the jet outlet 2d can be maintained at a sufficiently high level until discharge is completed.

[0081] Furthermore, according to the cleaning water tank device 4 of this embodiment, the stepped portion 14e, which expands the cross-sectional area A1 of the first tank portion 13, is provided at a position higher than the rim dead water level RWL. Therefore, cleaning water stored below the stepped portion 14e of the first tank portion 13 can be discharged from the rim outlet 2c, and a sufficient amount of cleaning water can be discharged from the rim outlet 2c.

[0082] Furthermore, according to the cleaning water tank device 4 of this embodiment, the ratio of the cross-sectional areas (A1 / A2) of the first tank section 13 and the second tank section 15 is reversed at the first height H1 and the second height H2, so that the instantaneous flow rate of cleaning water discharged from the jet outlet 2d can be increased while simultaneously ensuring a sufficient amount of cleaning water discharged from the rim outlet 2c.

[0083] The flushing water tank device and the flush toilet device equipped therewith according to embodiments of the present invention have been described above, but various modifications can be made to the embodiments described above. In particular, in the embodiments described above, the first tank section and the second tank section were formed by arranging an inner tank inside the flushing water tank body, but the first tank section and the second tank section can also be formed by providing a partition wall inside the flushing water tank body.

[0084] Furthermore, in the above-described embodiment, the horizontal cross-sectional area of ​​the first tank section and the second tank section changes abruptly due to the stepped portion provided in the inner tank. However, the partition wall inside the washing water tank body or the inner tank can also be configured such that the horizontal cross-sectional area of ​​the first tank section and the second tank section changes gradually in accordance with the height.

[0085] Furthermore, in the embodiments described above, a ball tap was used as a water supply valve to switch the supply and stop of cleaning water to be stored in the cleaning water tank body and inner tank, but a water supply valve other than a ball tap can also be used. In addition, in the embodiments described above, the jet water discharge drain valve was driven by a hydraulic drive mechanism, but a hydraulic drive mechanism is not required. [Explanation of symbols]

[0086] 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 4. Washing water tank device 4a Lever handle 6 Water source 8. Drain valve for rim discharge (switching mechanism for rim discharge) 8a Jade chain 10. Drain valve for jet water discharge 10a valve stem 12 Washing water tank body 12a 1st drain 12b 2nd drain 13. Tank Section 1 14 Inner Tank 14a Outlet 14b Drain opening forming member 14c notch 14d notch 14e Stepped section 15. Second Tank Section 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 20c bleed hole 20d Pressure chamber 20e Pressure passage 22 Floats 24 Arm section 24a Support shaft 26 Pilot valve 26a Pilot valve port 28 rods 30 Clutch mechanism 32 Water supply pipe 32a Water inlet

Claims

1. A flushing water tank device that is attached to the main body of a flush toilet and used to supply flushing water, A flushing water tank body comprising a first tank section and a second tank section for storing flushing water supplied to the above-mentioned flush toilet body, A rim water discharge switching mechanism is provided to switch between discharging and stopping the flushing water in the first tank so that the flushing water in the first tank is discharged from the rim water outlet of the toilet body, A jet discharge valve is provided to switch between discharging and stopping the flushing water in the second tank so that the flushing water in the second tank is discharged from the jet outlet of the toilet body. It has, The first tank section and the second tank section are configured such that their cross-sectional areas differ according to their height, and the ratio of the cross-sectional areas of the first tank section and the second tank section at a first height is different from the ratio of the cross-sectional areas at a second height which is lower than the first height. The second tank section is configured to have a cross-sectional area greater than or equal to the cross-sectional area of ​​the first tank section at the first height. A washing water tank device characterized in that the second tank section has a third height between the first height and the second height, the second tank section is configured to have a reduced cross-sectional area below the third height, while the first tank section is configured to have a larger cross-sectional area below the third height.

2. The washing water tank device according to claim 1, wherein the second tank section is provided with a stepped portion at a height between the first height and the second height, and the second tank section is configured such that its cross-sectional area is reduced below the stepped portion, while the first tank section is configured such that its cross-sectional area is increased below the stepped portion.

3. The cleaning water tank device according to claim 1, wherein an inner tank is arranged inside the cleaning water tank body, the second tank section is formed inside the inner tank, and the first tank section is formed inside the cleaning water tank body and outside the inner tank.

4. The washing water tank device according to claim 2, wherein the above-mentioned jet discharge drain valve is configured to discharge the washing water from the second tank so that the water level in the second tank falls from a predetermined initial water level to a jet dead water level, which is the water level at which the discharge of water from the jet outlet stops, and the stepped portion is provided at a position lower than the jet dead water level.

5. The rim water discharge switching mechanism is configured to discharge the cleaning water from the first tank so that the water level in the first tank is lowered from a predetermined initial level to a rim dead water level, which is the water level at which water discharge from the rim outlet is stopped, and the stepped portion is provided at a position higher than the rim dead water level, as described in claim 2.

6. The washing water tank device according to any one of claims 1 to 5, wherein the first tank section and the second tank section are configured such that the relative size of the cross-sectional area of ​​the first tank section and the cross-sectional area of ​​the second tank section is reversed with respect to the first height and the second height.

7. A flush toilet device that is cleaned by flush water stored in a flush water tank, A toilet bowl body equipped with a bowl section, a rim spout, and a jet spout, A flushing water tank device according to any one of claims 1 to 5, which supplies flushing water to the rim outlet and the jet outlet of the flush toilet body, A flush toilet device characterized by having the following features.

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