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

Abstract

To provide a washing water tank device capable of keeping low profile despite having a plurality of tanks for storing washing water.SOLUTION: A washing water tank device (4) of the invention comprises: an outer tank (12); an inner tank (14) disposed in the outer tank; a feed water valve (16); a first water discharge / stop switching mechanism (8) that is disposed in the outer tank and outside the inner tank and switches between supply and stop of the washing water stored in the outer tank to a flush toilet bowl body; and a second water discharge / stop switching mechanism (10) that is disposed in the inner tank and switches between supply and stop of the washing water stored in the inner tank to the flush toilet bowl body. The feed water valve is constituted so as to feed the washing water into the inner tank. The washing water fed into the inner tank overflows from two or more sides of the inner tank and flows into the outer tank.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a flush water tank apparatus, and more particularly, to a flush water tank apparatus that is used by being attached to a flush toilet main body so as to supply flush water, and a flush toilet apparatus provided with the same.

Background Art

[0002] Japanese Utility Model Application Laid-Open No. 6-56183 (Patent Document 1) describes a water supply apparatus for toilet flushing. In this water supply apparatus for toilet flushing, a tank for storing flush water is divided into two parts by a partition plate, and a drain valve is provided in each of the divided tanks. In addition, a ball tap water faucet is provided on one side of the tank partitioned by the partition plate, and flush water supplied from a water supply source flows therein. Then, when the water level in the tank on the side where the ball tap water faucet is provided rises and exceeds the height of the partition plate, the flush water overflows the upper edge of the partition plate and flows into the side where no ball tap water faucet is provided. In the water supply apparatus for toilet flushing described in Patent Document 1, flush water is supplied to both tanks partitioned by the partition plate by one water supply valve (ball tap water faucet) in this manner.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As described in Patent Document 1, a toilet flushing water supply device that divides the flushing water tank and provides a drain valve for each section is effective for water conservation and improving flushing performance because the amount of flushing water supplied through each drain valve can be precisely set. However, in the toilet flushing water supply device described in Patent Document 1, the flushing water supplied from the water supply valve overflows over a partition plate and flows into the other tank, which presents a problem in that it is difficult to make the flushing water tank low profile. In other words, various mechanisms and electrical components, such as devices for driving the drain valve, are generally located above the water surface of the flushing water tank, and if these are exposed to water, it will cause malfunctions. However, when flushing water flows over the partition plate, it is necessary to secure a certain amount of space above the height of the overflowing flushing water before arranging the electrical components, etc. For this reason, in the toilet flushing water supply device described in Patent Document 1, it is necessary to secure a large space above the upper edge of the partition plate, making it difficult to make the flushing water tank low profile.

[0005] Therefore, the present invention aims to provide a flushing water tank device that can achieve a low profile while having multiple tanks for storing flushing water, and a flush 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: an outer tank for storing flush water to be supplied to the flush toilet body; a resin inner tank disposed inside the outer tank for storing flush water to be supplied to the flush toilet body; a water supply valve for switching the supply and stopping of flush water to be stored in the outer tank and the inner tank; a first discharge / stop switching mechanism disposed inside the outer tank and outside the inner tank for switching the supply and stopping of flush water stored in the outer tank to the flush toilet body; and a second discharge / stop switching mechanism disposed inside the inner tank for switching the supply and stopping of flush water stored in the inner tank to the flush toilet body, wherein the water supply valve is configured to supply flush water into the inner tank, and the flush water supplied into the inner tank overflows from two or more sides of the inner tank and flows into the outer tank.

[0007] According to the present invention configured in this way, the water supply valve is configured to supply cleaning water into the inner tank, and the cleaning water supplied into the inner tank overflows from two or more sides of the inner tank and flows into the outer tank. This allows the overflow edge of the cleaning water to be made longer, and the water level of the cleaning water flowing over the edge of the inner tank can be kept low. As a result, it becomes possible to set a lower space above the inner tank, and the cleaning water tank device can be made to have a low profile.

[0008] In the present invention, preferably, the inner tank is configured such that the length of the outer circumference of its upper end is 1 / 2 or more of the length of the outer circumference of the upper end of the outer tank.

[0009] With the present invention configured in this way, since the length of the outer circumference of the upper end of the inner tank is set to be at least half the length of the outer circumference of the upper end of the outer tank, the rim of the inner tank overflowing with cleaning water can be set to be sufficiently long, and the water level of the cleaning water flowing over the rim of the inner tank can be kept low.

[0010] In the present invention, preferably, the inner tank is configured such that its cross-sectional area changes in the height direction, and the upper cross-sectional area of ​​the inner tank is larger than the lower cross-sectional area.

[0011] With the present invention configured in this way, the upper cross-sectional area of ​​the inner tank is larger than the lower cross-sectional area, making it possible to create a longer rim over which the flushing water overflows the inner tank. As a result, the water level of the flushing water flowing over the rim of the inner tank can be kept low. Furthermore, because the upper cross-sectional area of ​​the inner tank is larger than the lower cross-sectional area, a large amount of flushing water with high head pressure is stored inside the inner tank. Therefore, the instantaneous flow rate of flushing water discharged from the inner tank can be increased, and the toilet bowl can be effectively cleaned.

[0012] In the present invention, preferably, the water supply valve is configured to allow cleaning water to flow into the inner tank from a water inlet located below the water level in the inner tank.

[0013] With the present invention configured in this way, the water supply valve is configured to allow cleaning water to flow into the inner tank from a water inlet located below the water level in the inner tank, thus suppressing the turbulence of the cleaning water flowing into the inner tank from the water inlet. As a result, even if the space above the inner tank is set low, the risk of equipment positioned above the inner tank being submerged in water can be reduced, and the cleaning water tank device can be made to have a low profile.

[0014] In the present invention, preferably, the inner tank is configured such that the length of the outer circumference of its upper end is longer than the length of the outer circumference of the upper end of the outer tank.

[0015] With the present invention configured in this way, since the length of the outer circumference of the upper end of the inner tank is longer than the length of the outer circumference of the upper end of the outer tank, the rim of the inner tank overflowing with cleaning water can be set to be extremely long, and the water level of the cleaning water flowing over the rim of the inner tank can be kept sufficiently low.

[0016] Furthermore, the present invention is a flush toilet device that is cleaned by flush water stored in a flush water tank, and is characterized by comprising a flush toilet body provided with a bowl section, a rim spout, and a jet spout, and a flush water tank device of the present invention that supplies flush water to the rim spout and the jet spout of the flush toilet body. [Effects of the Invention]

[0017] According to the present invention, the flushing water tank device and the flush toilet device equipped therewith, it is possible to achieve a low profile while providing multiple tanks for storing flushing water. [Brief explanation of the drawing]

[0018] [Figure 1] This is a block diagram showing the overall configuration of a flush toilet device according to an embodiment of the present invention. [Figure 2] This is a top view showing a schematic configuration of a flush toilet device according to an embodiment of the present invention. [Figure 3] This is a front cross-sectional view showing the schematic configuration of a flushing water tank device provided in a flush toilet device according to an embodiment of the present invention. [Figure 4] This is a cross-sectional view showing the structure of a ball tap built into a cleaning water tank device according to an embodiment of the present invention. [Figure 5] This is a cross-sectional view showing the structure of a hydraulic drive mechanism built into a washing water tank device according to an embodiment of the present invention. [Figure 6] This is a time chart showing the operation of a flush toilet device according to an embodiment of the present invention. [Modes for carrying out the invention]

[0019] Next, with reference to the attached drawings, a flush water tank apparatus according to an embodiment of the present invention, and a flush toilet apparatus equipped with the same will be described. Figure 1 is a block diagram showing the overall configuration of a flush toilet apparatus according to an embodiment of the present invention. Figure 2 is a top view showing the schematic configuration of the flush toilet apparatus according to the embodiment of the present invention. Figure 3 is a front cross-sectional view showing the schematic configuration of the flush water tank apparatus provided in the flush toilet apparatus according to the embodiment of the present invention. Figure 4 is a cross-sectional view showing the structure of a ball tap built into the flush water tank apparatus according to the 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 apparatus according to the embodiment of the present invention.

[0020] As shown in Figure 1 and Figure 2, the flush toilet apparatus 1 according to the embodiment of the present invention is composed of a flush toilet main body 2, and a flush water tank apparatus 4 arranged at the rear part of the flush toilet main body 2. The flush toilet apparatus 1 of the present embodiment is configured such that flushing is performed by operating a lever handle 4a provided on the flush water tank apparatus 4 after use.

[0021] The flush toilet main body 2 includes a bowl portion 2a, and a drainage trap pipe line 2b extending from the lower part of the bowl portion 2a. Further, a rim water discharge port 2c is provided at the upper edge of the bowl portion 2a, and a jet water discharge port 2d is provided at the lower part of the bowl portion 2a. At the time of toilet flushing, flush water is discharged respectively from these rim water discharge port 2c and jet water discharge port 2d at a predetermined timing, the filth receiving surface of the bowl portion 2a is flushed, and the filth and flush water in the bowl portion 2a are discharged to the drainage trap pipe line 2b. The filth and flush water discharged to the drainage trap pipe line 2b are discharged through a drainage socket (not shown) to a sewage pipe (not shown).

[0022] 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 first drain valve 8, which is a first water discharge / stop switching mechanism, and a second drain valve 10, which is a second water discharge / stop switching mechanism, and is configured to open and close the drain port located at the bottom of the cleaning water tank device 4, respectively.

[0023] In this embodiment, by opening the first drain valve 8, flushing water is discharged from the rim outlet 2c through the rim water channel 2e formed inside the toilet bowl body 2. Also, by opening the second drain valve 10, flushing water is discharged from the jet outlet 2d through the jet water channel 2f formed inside the toilet bowl body 2.

[0024] 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 an outer tank 12, an inner tank 14 located inside the outer tank, a first drain valve 8 located inside the outer tank 12, a second 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.

[0025] The outer tank 12 and the inner tank 14 are containers configured to store flushing water to be supplied to the toilet bowl body 2. In this embodiment, the outer tank 12 is made of ceramic, and the inner tank 14, which is located inside the outer tank 12, is made of resin.

[0026] Furthermore, as shown in Figure 3, a first drain port 12a and a second drain port 12b are provided on the bottom surface of the outer tank 12, and in this embodiment, these drain ports are circular in shape. Here, the flushing water stored in the outer tank 12 (and outside the inner tank 14) flows through the first drain port 12a into the rim water channel 2e of the toilet bowl body 2, and the flushing water stored in the inner tank 14 flows through the second drain port 12b into the jet water channel 2f of the toilet bowl body 2.

[0027] The inner tank 14 is positioned on the bottom surface of the outer tank 12, and the lower part of the inner tank 14 is submerged in the flushing water stored in the outer tank 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 outer tank 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 toilet body 2 through the outlet 14a of the inner tank 14 and the second drain outlet 12b of the outer tank 12.

[0028] 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 second drain valve 10 is seated on this seat surface. Therefore, in this embodiment, the seat surface on which the second drain valve 10 is seated is made of a separate component from the inner tank 14.

[0029] Furthermore, as shown in Figure 2, the outer tank 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. The inner tank 14, which is located inside the outer tank 12, is also configured in a way that the width direction is longer and the depth direction is shorter when viewed from above, and it is also made to have an irregular shape to avoid the first drain valve 8 and the ballcock 16.

[0030] Specifically, in this embodiment, a ball tap 16 is located at the front left end (lower left corner in Figure 2) of the outer tank 12, and a first 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 the front of both ends in the width direction when viewed from above, so as to avoid the ball tap 16 and the first drain valve 8.

[0031] In other words, the upper part of the inner tank 14 has almost the same external shape as the outer tank 12 when viewed from above. Furthermore, a U-shaped notch 14c is provided in the inner tank 14 where the first drain valve 8 is located, and a notch 14d is provided in the part where the ball tap 16 is located, so as not to interfere with the inner tank 14.

[0032] Furthermore, in this embodiment, the upper end of the inner tank 14 is configured to be at the same height all around. Therefore, when the cleaning water supplied to the inner tank 14 overflows and flows into the outer tank 12, the cleaning water flows over the entire circumference of the upper edge of the inner tank 14 into the outer tank. This makes it possible to sufficiently increase the length of the edge over which the cleaning water in the inner tank 14 overflows. Preferably, the inner tank 14 is configured such that the cleaning water in the inner tank 14 overflows from two or more sides of the inner tank 14 and flows into the outer tank 12.

[0033] Furthermore, as shown in Figure 2, in this embodiment, the outer peripheral wall of the inner tank 14 is configured to be substantially the same shape as the inner peripheral wall of the outer tank 12, and the gap between the outer peripheral wall of the inner tank 14 and the inner peripheral wall of the outer tank 12 is configured to be small. As a result, in this embodiment, the length of the outer circumference of the upper end of the inner tank 14 is longer than the length of the outer circumference of the upper end of the outer tank 12 (the length of the outer circumference is increased by providing notches 14c and 14d in the inner tank 14). This makes it possible to make the length of the edge over which the cleaning water flows when the cleaning water supplied into the inner tank 14 overflows and flows into the outer tank extremely long. Preferably, the length of the outer circumference of the upper end of the inner tank 14 is configured to be 1 / 2 or more of the length of the outer circumference of the upper end of the outer tank 12.

[0034] On the other hand, as shown in Figure 3, stepped sections are formed on both sides of the inner tank 14 in the width direction, and the lower part is configured to be narrower. That is, the inner tank 14 is formed in a roughly T-shape when viewed from the front, and at least the lower part of the inner tank 14 is submerged in the cleaning water stored in the outer tank 12. In other words, the inner tank 14 is configured so that its cross-sectional area changes in the height direction, and the horizontal cross-sectional area at the top of the inner tank 14 is larger than the horizontal cross-sectional area at the bottom. By making the upper part of the inner tank 14 larger, a large amount of cleaning water with high potential energy is stored in the inner tank 14. This makes it possible to increase the hydrostatic pressure of the cleaning water discharged from the inner tank 14, and to increase the instantaneous flow rate of the discharged cleaning water.

[0035] In this way, 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. Furthermore, since the inner tank 14 made of resin can have thinner walls than when it is made of ceramic, the volume inside the outer tank 12 can be used effectively.

[0036] Next, the first drain valve 8, which is the first water discharge / stop switching mechanism, is a valve body positioned to open and close the first drain port 12a provided in the outer tank 12. When the first drain valve 8 is pulled upward, the first drain port 12a is opened. As a result, the flushing water in the outer tank 12 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 first drain valve 8, which is the first water discharge / stop switching mechanism, switches the supply of flushing water stored in the outer tank 12 to the toilet bowl body 2 and stops it.

[0037] 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 first drain valve 8, thereby raising the first drain valve 8. As a modification, the present invention can also be configured so that the first 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).

[0038] Furthermore, in this embodiment, a first drain valve 8 is provided as the first discharge / stop switching mechanism, but a configuration other than the first drain valve 8 can be used as the first discharge / stop switching mechanism. For example, a jet pump (not shown) that flows the flushing water stored in the outer tank 12 into the toilet bowl body can be used as the first discharge / stop switching mechanism. In this case, the nozzle (not shown) of the jet pump is placed inside the outer tank 12, and a portion of the flushing water supplied via a water supply valve such as a ballcock 16 is sprayed from this nozzle. By spraying flushing water from the nozzle inside the outer tank 12, the flushing water stored in the outer tank 12 is drawn in, and the flushing water in the outer tank 12 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 the supply and stop of flushing water to the toilet bowl body 2 can be used as the first discharge / stop switching mechanism.

[0039] Next, the second drain valve 10, which is the second water discharge / stop switching mechanism, is a valve body positioned to open and close the outlet 14a provided in the inner tank 14. By pulling the second drain valve 10 upward, the second drain valve 10 separates from the seat surface of the outlet 14a, and the outlet 14a opens. As a result, the flushing water in the inner tank 14 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 bowl body 2, and is discharged from the jet water outlet 2d. Therefore, the second drain valve 10, which is the second water discharge / stop switching mechanism, switches the supply of flushing water stored in the inner tank 14 to the toilet bowl body 2 and stops it.

[0040] Furthermore, in this embodiment, the second drain valve 10 is configured to be pulled up from the outlet 14a by a hydraulic drive mechanism 18. That is, the second drain valve 10 is a valve body with a valve stem 10a extending upward, and the valve stem 10a is pulled up by the hydraulic drive mechanism 18. When the second 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.

[0041] Furthermore, in this embodiment, a second drain valve 10 is provided as the second water discharge / stop switching mechanism, but other components can be used as the second water discharge / stop switching mechanism. For example, a jet pump (not shown) that flows the flushing water stored in the inner tank 14 into the toilet bowl body can be used as the second water discharge / stop switching mechanism. In this case, the nozzle (not shown) of the jet pump is placed inside the inner tank 14, and a portion of the flushing water supplied via a water supply valve such as a ballcock 16 is sprayed from this nozzle. By spraying flushing water from the nozzle inside the inner tank 14, the flushing water stored in the inner tank 14 is drawn in, and the flushing water in the inner tank 14 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 the supply and stop of flushing water to the toilet bowl body 2 can be used as the second water discharge / stop switching mechanism.

[0042] 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 outer tank 12 and the inner tank 14.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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 located inside the outer tank 12 and moves vertically according to the water level inside the outer tank 12. As a result, when the water level inside the outer tank 12 rises above a predetermined level, the float 22 is pushed upward, and the pilot valve 26 moves downward, seats in the pilot valve port 26a, and closes it. On the other hand, when the flushing water inside the outer tank 12 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. For this reason, when the toilet is waiting to be flushed and the water level inside the outer tank 12 is higher than a predetermined level, the pilot valve port 26a of the main body 20 is in a closed state.

[0048] 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.

[0049] On the other hand, when the first drain valve 8 is opened by the cleaning operation and the water level in the outer tank 12 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.

[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 second 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 second 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 second 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.

[0053] 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 inner tank 14 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 inner tank 14 when it is in standby mode. Therefore, the ball tap 16 is configured to allow cleaning water to flow into the inner tank 14 from the water inlet 32a, which is located below the water level of the inner tank 14. By supplying cleaning water into the inner tank 14 from below the water level of the stored cleaning water in this way, it is possible to suppress the turbulence of the water surface of the cleaning water that flows into the inner tank 14.

[0054] 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 second 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 second 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 second drain valve 10 upward, and the second drain valve 10 opens.

[0055] 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.

[0056] Furthermore, the clutch mechanism 30 detachably connects the rod 28 and the second drain valve 10. When the second 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 second drain valve 10 from the rod 28. When the clutch mechanism 30 is disconnected, the second drain valve 10 is no longer linked to the movement of the piston 18b and the rod 28, and the second 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.

[0057] Next, with reference to Figure 6, 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, and from top to bottom, it shows the state of jet water discharge, rim water discharge, and ballcock.

[0058] First, in the standby state for toilet flushing, the first drain port 12a of the outer tank 12 and the discharge port 14a of the inner tank 14 are closed by the first drain valve 8 and the second drain valve 10, respectively. Also in the standby state, flushing water is stored in the outer tank 12 and the inner tank 14 up to a predetermined initial water level. The initial water level of the outer tank 12 is higher than the predetermined water level, so 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. In this embodiment, the initial water level of the inner tank 14 is higher than the initial water level of the outer tank 12, and flushing water is stored in the inner tank 14 almost to its upper end.

[0059] Next, at time t1 in Figure 6, 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 first drain valve 8. This separates the first drain valve 8 from the first drain port 12a, opening the first drain port 12a. When the first drain port 12a is opened, the flushing water stored in the outer tank 12 (outside the inner tank 14) flows from the first drain port 12a into the rim water channel 2e (Figure 2) and is discharged from the rim outlet 2c. The water discharged from the rim outlet 2c creates a swirling flow on the waste receiving surface of the bowl section 2a, cleaning the waste receiving surface.

[0060] As the cleaning water is discharged from the first drain port 12a, the water level in the outer tank 12 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.

[0061] 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 second drain valve 10, opening the outlet 14a of the inner tank 14. In other words, the second drain valve 10 is driven and opened by the water supply pressure of the tap water supplied via the ball tap 16.

[0062] 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 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).

[0063] In this state, when the outlet 14a is closed, the inside of the jet water channel 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 second drain valve 10 is opened, there is no cleaning water at the upstream end of the jet water channel 2f.

[0064] When the second drain valve 10 is opened, the empty space in the jet water channel 2f is quickly filled with water, allowing the cleaning water to be discharged from the jet outlet 2d at an early stage. In particular, in this embodiment, the upper cross-sectional area of ​​the inner tank 14 is larger than the lower cross-sectional area, so the inner tank 14 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 channel 2f, and the instantaneous flow rate of cleaning water discharged from the jet outlet 2d can be increased.

[0065] Meanwhile, when the second 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 second drain valve 10 from the rod 28. As a result, the second 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 second drain valve 10 seats toward the outlet 14a, and the outlet 14a is closed. This stops the jet discharge from the jet outlet 2d.

[0066] 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. Here, when the second drain valve 10 is open, the flow rate of cleaning water flowing out of the outlet 14a of the inner tank 14 is greater than the flow rate of cleaning water flowing into the inner tank 14 through the water inlet 32a of the water supply pipe 32, so the water level in the inner tank 14 decreases. Then, after the jet discharge is stopped at time t3 in Figure 6 (after the second drain valve 10 is closed), the water level in the inner tank 14 rises due to the cleaning water flowing in from the water supply pipe 32.

[0067] Meanwhile, since the first drain valve 8 remains open, the cleaning water in the outer tank 12 flows out from the first drain port 12a, and the water level in the outer tank 12 continues to decrease. Then, at time t4 in Figure 6, when the water level in the outer tank 12 drops to a predetermined dead water level, the first drain valve 8 seats on the first drain port 12a, and the first drain valve 8 closes. As a result, the discharge of water from the rim discharge port 2c stops.

[0068] Furthermore, even after the first drain 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 inner tank 14 from the water inlet 32a of the water supply pipe 32 via the ball tap 16 and the water pressure drive mechanism 18. At this time, since the water inlet 32a of the water supply pipe 32 opens at the bottom of the inner tank 14, the water inlet 32a is located below the water surface of the cleaning water stored in the inner tank 14, and the cleaning water flows into the inner tank 14 from underwater. As a result, splashing of the cleaning water and ripples on the water surface inside the inner tank 14 are suppressed when the cleaning water flows into the inner tank 14 from the water inlet 32a.

[0069] As the cleaning water flows in, the water level in the inner tank 14 rises, and when the inner tank 14 is full at time t5 in Figure 6, the cleaning water begins to overflow from the inner tank 14. In this embodiment, the upper end of the inner tank 14 is formed at the same height all around, so the cleaning water overflows from all around the inner tank 14 and flows into the outer tank 12. Here, in this embodiment, the rim of the inner tank 14 over which the cleaning water flows is configured to be extremely long, so the water level of the cleaning water flowing over the rim of the inner tank 14 can be kept low. That is, the cleaning water overflowing from the inner tank 14 forms a thin film of water on the rim of the inner tank 14 as it flows over the rim and into the outer tank 12. In other words, because the rim of the inner tank 14 is formed to be long, a predetermined flow rate of cleaning water flowing in from the water inlet 32a can be discharged by simply forming a thin film of water on the rim. Furthermore, the present invention can also be configured such that the cleaning water supplied into the inner tank 14 overflows from two or more sides of the inner tank 14 and flows into the outer tank 12.

[0070] As cleaning water flows into the outer tank 12, the water level inside the outer tank 12 begins to rise. When the water level inside the outer tank 12 rises to a predetermined 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 inside the pressure chamber 20d rises. Then, at time t6 in Figure 6, the main valve body 20a is pressed by the pressure inside 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 into the inner tank 14 is stopped.

[0071] 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 stem 10a of the second drain valve 10. With this, one toilet flush is completed, and the flush toilet device 1 returns to the toilet flush standby state.

[0072] According to the cleaning water tank device 4 of the embodiment of the present invention, the ball tap 16 is configured to supply cleaning water into the inner tank 14, and the cleaning water supplied into the inner tank 14 overflows from the entire circumference of the inner tank 14 and flows into the outer tank 12. As a result, the rim over which the cleaning water overflows can be made longer, and the water level of the cleaning water flowing over the rim of the inner tank 14 can be kept low. As a result, it becomes possible to set a lower space to be provided above the inner tank 14, and the cleaning water tank device 4 can be made to have a low profile.

[0073] Furthermore, according to the cleaning water tank device 4 of this embodiment, since the length of the outer circumference of the upper end of the inner tank 14 is set to be at least half the length of the outer circumference of the upper end of the outer tank 12, the edge of the inner tank 14 overflowing with cleaning water can be set to be sufficiently long, and the water level of the cleaning water flowing over the edge of the inner tank 14 can be kept low.

[0074] Furthermore, according to the flushing water tank device 4 of this embodiment, the upper cross-sectional area of ​​the inner tank 14 is larger than the lower cross-sectional area, making it possible to create a longer rim of the inner tank 14 over which the flushing water overflows. As a result, the water level of the flushing water flowing over the rim of the inner tank 14 can be kept low. Also, because the upper cross-sectional area of ​​the inner tank 14 is larger than the lower cross-sectional area, a large amount of flushing water with high head pressure is stored in the inner tank 14. Therefore, the instantaneous flow rate of flushing water discharged from the inner tank 14 can be increased, and the toilet bowl body 2 can be effectively flushed.

[0075] Furthermore, according to the cleaning water tank device 4 of this embodiment, the ball tap 16 is configured to allow cleaning water to flow into the inner tank 14 from a water inlet 32a located below the water surface of the inner tank 14. This suppresses the turbulence of the cleaning water flowing into the inner tank 14 from the water inlet 32a. As a result, even if the space above the inner tank 14 is set low, the risk of equipment positioned above the inner tank 14 being submerged in water can be reduced, and the cleaning water tank device 4 can be made to have a low profile.

[0076] Furthermore, according to the cleaning water tank device 4 of this embodiment, since the length of the outer circumference of the upper end of the inner tank 14 is longer than the length of the outer circumference of the upper end of the outer tank 12, the edge of the inner tank 14 overflowing with cleaning water can be set to be extremely long, and the water level of the cleaning water flowing over the edge of the inner tank 14 can be kept sufficiently low.

[0077] 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 flushing water stored in the inner tank was discharged from the jet outlet, and the flushing water stored in the outer tank was discharged from the rim outlet. In contrast, as a modification, the present invention can be configured such that the flushing water from the inner tank is discharged from the rim outlet, and the flushing water from the outer tank is discharged from the jet outlet. Alternatively, the present invention can be applied to a flushing water tank device that supplies flushing water to a flush toilet body having outlets other than the rim outlet and the jet outlet.

[0078] Furthermore, in the above-described embodiment, a ball tap was used as a water supply valve to switch the supply and stop of the cleaning water to be stored in the outer tank and inner tank, but a water supply valve other than a ball tap can also be used. In addition, in the above-described embodiment, the second drain valve was driven by a hydraulic drive mechanism, but a hydraulic drive mechanism is not required. [Explanation of symbols]

[0079] 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. First drain valve (first discharge shut-off switching mechanism) 8a Jade chain 10. Second drain valve (second discharge shut-off switching mechanism) 10a valve stem 12 Outer Tank 12a 1st drain 12b 2nd drain 14 Inner Tank 14a Outlet 14b Drain opening forming member 14c notch 14d notch 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, An outer tank for storing flushing water to be supplied to the above-mentioned flush toilet unit, Inside this outer tank is a resin inner tank that stores flushing water to be supplied to the toilet bowl body, A water supply valve that switches between supplying and stopping the cleaning water to be stored in the outer tank and the inner tank, A first water discharge / stop switching mechanism is located inside the outer tank and outside the inner tank, and switches the supply of flushing water stored in the outer tank to the toilet bowl body on and off. A second water discharge / stop switching mechanism is located inside the inner tank and switches the supply of flushing water stored in the inner tank to the toilet bowl body on and off. It has, The above-mentioned water supply valve is configured to supply cleaning water into the inner tank, and the cleaning water supplied into the inner tank overflows from the entire circumference of the upper edge of the inner tank and flows into the outer tank, characterized in that the cleaning water tank device is configured such that the water supply valve is configured to supply cleaning water into the inner tank, and the cleaning water supplied into the inner tank overflows from the entire circumference of the upper edge of the inner tank and flows into the outer tank.

2. The washing water tank device according to claim 1, wherein the length of the outer circumference of the upper end of the inner tank is configured to be 1 / 2 or more of the length of the outer circumference of the upper end of the outer tank.

3. The washing water tank device according to claim 1, wherein the inner tank is configured such that its cross-sectional area changes in the height direction, and the upper cross-sectional area of ​​the inner tank is larger than the lower cross-sectional area.

4. The flushing water tank device according to claim 1, wherein the water supply valve is configured to allow flushing water to flow into the inner tank from a water inlet located below the water level in the inner tank when the toilet is in standby mode.

5. The washing water tank device according to claim 1, wherein the length of the outer circumference of the upper end of the inner tank is longer than the length of the outer circumference of the upper end of the outer tank.

6. 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 claim 1 that 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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