Flush water tank device and flush toilet device provided with same

Abstract

The purpose of the present invention is to provide a flush water tank device which can be provided with a plurality of tanks for storing flush water and which can be reduced in profile. The present invention is a wash water tank device (4) characterized by comprising: an external water tank (12); an internal water tank (14) disposed inside the external water tank; a water supply valve (16); a first water discharge / stop switching mechanism (8) which is disposed in the external water tank and outside the internal water tank, and which switches the supply or stop of the supply of the flush water stored in the external water tank to the flush toilet main body; and a second water discharge / stop switching mechanism (10) that is disposed in the internal water tank and that switches between supply or stop of supply of the flush water stored in the internal water tank to the flush toilet main body, the water supply valve being configured so as to supply the flush water to the internal water tank, and the second water discharge / stop switching mechanism (10) being configured so as to discharge the flush water from the internal water tank. The wash water supplied into the internal water tank overflows from two or more edges of the internal water tank and flows into the external water tank.

Description

Technical Field

[0001] The present invention relates to a flush water tank device, and more particularly to a flush water tank device installed on a flush toilet body for use in supplying flush water, and a flush toilet device equipped with the flush water tank device. Background Art

[0002] Japanese Utility Model Application Gazette No. Hei 6-56183 (Patent Document 1) describes a toilet flushing water supply device. In this toilet flushing water supply device, a water tank for storing flushing water is divided into two by a partition plate, and a drain valve is provided in each of the divided water tanks. In addition, a float valve water supply tap is provided on one side of the water tank separated by the partition plate, and flushing water supplied from the water supply source flows into this side. Furthermore, if the water level of the water tank on the side where the float valve water supply tap is provided rises and exceeds the height of the partition plate, the flushing water overflows at the upper edge of the partition plate and flows into the side where the float valve water supply tap is not provided. In the toilet flushing water supply device described in Patent Document 1, flushing water is supplied to the water tanks on both sides separated by the partition plate through a single water supply valve (float valve water supply tap).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Utility Model Application No. Heisei 6-56183. Summary of the Invention

[0006] Problems to be solved by the invention

[0007] As shown in the toilet flush water supply device described in Patent Document 1, the structure of dividing the flush water tank and providing separate drain valves allows for accurate setting of the flush water volume supplied through each drain valve, effectively conserving water and improving flushing performance. However, the toilet flush water supply device described in Patent Document 1 faces the problem of difficulty in achieving a low-profile flush water tank, as the flush water supplied from the water supply valve overflows over the partition plate and flows into the other tank. Specifically, various mechanisms and electrical components, such as those for driving the drain valve, are typically located above the water surface in the flush water tank. If these components become wet, they can malfunction. However, if flush water overflows over the partition plate, it is necessary to ensure a specified space above the level of the overflowing flush water before installing the electrical components. Therefore, the toilet flush water supply device described in Patent Document 1 requires a large space above the upper edge of the partition plate, making it difficult to achieve a low-profile flush water tank.

[0008] Therefore, an object of the present invention is to provide a flush water tank device that can be provided with a plurality of tanks for storing flush water and can achieve a low profile, and a flush toilet device including the flush water tank device.

[0009] Means used to solve problems

[0010] In order to solve the above-mentioned problems, the present invention is a flush water tank device installed on a flush toilet body for use in supplying flush water, characterized in that it comprises: an external water tank that accumulates flush water for supply to the flush toilet body; an internal water tank made of resin, which is arranged inside the external water tank and accumulates flush water for supply to the flush toilet body; a water supply valve that switches the supply or stops the flush water to be accumulated in the external water tank and the internal water tank; a first water-discharging-stopping switching mechanism, which is arranged in the external water tank and outside the internal water tank, and is used to switch the supply or stops the supply of flush water accumulated in the external water tank to the flush toilet body; and a second water-discharging-stopping switching mechanism, which is arranged in the internal water tank, and is used to switch the supply or stops the supply of flush water accumulated in the internal water tank to the flush toilet body, and the water supply valve is configured to supply flush water to the internal water tank, and the flush water supplied to the internal water tank overflows from two or more edges of the internal water tank and flows into the external water tank.

[0011] According to the present invention thus constructed, the water supply valve is configured to supply flush water to the inner tank, and the flush water supplied to the inner tank overflows from two or more edges of the inner tank and flows into the outer tank. This allows the overflow edge of the flush water to be extended, thereby keeping the level of the flush water flowing through the edge of the inner tank low. Consequently, the space required above the inner tank can be reduced, allowing the flush water tank assembly to have a low profile.

[0012] In the present invention, preferably, the inner tank is configured such that the length of the outer periphery of the upper end thereof is equal to or greater than 1 / 2 of the length of the outer periphery of the upper end of the outer tank.

[0013] According to the present invention constructed in this manner, since the length of the outer periphery of the upper end of the inner water tank is constructed to be more than 1 / 2 of the length of the outer periphery of the upper end of the outer water tank, the edge of the inner water tank for overflow of the washing water can be set to be sufficiently long, thereby enabling the water level of the washing water flowing through the edge of the inner water tank to be suppressed to a lower level.

[0014] In the present invention, preferably, the internal tank is configured such that a cross-sectional area varies in a height direction, and the cross-sectional area of ​​an upper portion of the internal tank is configured to be larger than that of a lower portion.

[0015] According to the present invention constructed in this manner, since the cross-sectional area of ​​the upper portion of the internal water tank is larger than that of the lower portion, the rim of the internal water tank, through which the flush water overflows, can be made longer. As a result, the level of the flush water flowing through the rim of the internal water tank can be kept low. Furthermore, since the cross-sectional area of ​​the upper portion of the internal water tank is larger than that of the lower portion, a large amount of flush water with a high head pressure accumulates in the internal water tank. This increases the instantaneous flow rate of the flush water discharged from the internal water tank, allowing the flush water to effectively flush the toilet body.

[0016] In the present invention, preferably, the water supply valve is configured to allow flush water to flow into the inner tank from a water supply port provided below a water surface of the inner tank.

[0017] According to the present invention thus constructed, the water supply valve is configured to allow flush water to flow into the inner water tank from the water supply port located below the water surface of the inner water tank. This suppresses fluctuations in the flush water flowing from the water supply port into the inner water tank. Consequently, even when the space above the inner water tank is set low, the risk of equipment located above the inner water tank being wetted by water can be reduced, and the flush water tank assembly can be made low-profile.

[0018] In the present invention, preferably, the inner tank is configured such that the length of the outer periphery of the upper end thereof is longer than the length of the outer periphery of the upper end of the outer tank.

[0019] According to the present invention constructed in this manner, since the length of the outer periphery of the upper end of the inner water tank is longer than the length of the outer periphery of the upper end of the outer water tank, the edge of the inner water tank for overflow of the washing water can be set to be extremely long, thereby enabling the water level of the washing water flowing through the edge of the inner water tank to be suppressed to a sufficiently low level.

[0020] In addition, the present invention is a flush toilet device that performs cleaning by using flush water accumulated in a flush water tank, and is characterized in that it has: a flush toilet main body, which is provided with a bowl, an inner rim water spouting port, and a jet water spouting port; and the flush water tank device of the present invention, which supplies flush water to the inner rim water spouting port and the jet water spouting port of the flush toilet main body.

[0021] Effects of the Invention

[0022] According to the flush water tank device of the present invention and the flush toilet device equipped with the flush water tank device, a plurality of tanks for storing flush water can be provided while achieving a low profile. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a block diagram showing the overall structure of a flush toilet apparatus according to an embodiment of the present invention;

[0024] Figure 2 This is a plan view showing a schematic structure of a flush toilet apparatus according to an embodiment of the present invention;

[0025] Figure 3 This is a front sectional view showing a schematic structure of a flush water tank device included in a flush toilet device according to an embodiment of the present invention;

[0026] Figure 4 is a cross-sectional view showing the structure of a float valve built into the flush water tank device according to an embodiment of the present invention;

[0027] Figure 5 is a cross-sectional view showing the structure of a hydraulic drive mechanism built into the flush water tank device according to an embodiment of the present invention;

[0028] Figure 6 This is a timing chart showing the operation of the flush toilet apparatus according to the embodiment of the present invention. DETAILED DESCRIPTION

[0029] Next, a flush water tank assembly according to an embodiment of the present invention and a flush toilet assembly including the flush water tank assembly will be described with reference to the drawings.

[0030] Figure 1 It is a block diagram showing the overall structure of a flush toilet apparatus according to an embodiment of the present invention.

[0031] Figure 2 It is a plan view showing a schematic structure of a flush toilet apparatus according to an embodiment of the present invention. Figure 3 It is a front cross-sectional view showing a schematic structure of a flush water tank assembly included in the flush toilet apparatus according to the embodiment of the present invention. Figure 4 This is a cross-sectional view showing the structure of a float valve built into the flush water tank assembly according to the embodiment of the present invention. Figure 5 This is a cross-sectional view showing the structure of a hydraulic drive mechanism built into the flush water tank assembly according to the embodiment of the present invention.

[0032] like Figure 1 and Figure 2 As shown, a flush toilet apparatus 1 according to an embodiment of the present invention includes a flush toilet body 2 and a flush water tank assembly 4 disposed at the rear of the flush toilet body 2. The flush toilet apparatus 1 of this embodiment is configured so that after use, flushing is performed by operating a lever-type flush handle 4a provided on the flush water tank assembly 4.

[0033] The flush toilet body 2 includes a bowl 2a and a drain elbow conduit 2b extending from the lower portion of the bowl 2a. Furthermore, a rim spout 2c is provided at the upper edge of the bowl 2a, and a jet spout 2d is provided at the lower portion. When flushing the toilet, flush water is discharged from the rim spout 2c and jet spout 2d at predetermined times, thereby cleaning the waste-receiving surface of the bowl 2a. The waste and flush water within the bowl 2a are then discharged into the drain elbow conduit 2b. The waste and flush water discharged into the drain elbow conduit 2b are then discharged into a sewage pipe (not shown) through a drain socket (not shown).

[0034] Wash water is supplied from a water supply source 6 such as a tap water pipe to the wash water tank device 4, and the supplied wash water is accumulated in the wash water tank device 4. In addition, a first drain valve 8 serving as a first water discharge / stop switching mechanism and a second drain valve 10 serving as a second water discharge / stop switching mechanism are built into the wash water tank device 4, and are configured to open or close a drain port provided at the bottom of the wash water tank device 4, respectively.

[0035] In this embodiment, by opening the first drain valve 8, flush water flows through the rim conduit 2e formed inside the flush toilet body 2 and is discharged from the rim spout 2c. Furthermore, by opening the second drain valve 10, flush water flows through the jet conduit 2f formed inside the flush toilet body 2 and is discharged from the jet spout 2d.

[0036] Next, refer to Figure 2 and Figure 3 , the internal structure of the flush water tank device 4 is described.

[0037] like Figure 2 and Figure 3 As shown, the flush water tank device 4 has: an external water tank 12; an internal water tank 14, which is arranged inside the external water tank; a first drain valve 8, which is arranged in the external water tank 12; a second drain valve 10, which is arranged in the internal water tank 14; a float valve 16, which is a water supply valve; and a water pressure drive mechanism 18.

[0038] The external tank 12 and the internal tank 14 are containers configured to store flush water to be supplied to the flush toilet body 2. In this embodiment, the external tank 12 is made of ceramic, and the internal tank 14 disposed inside the external tank 12 is made of resin.

[0039] In addition, if Figure 3As shown, the bottom surface of the external water tank 12 is provided with a first drain port 12a and a second drain port 12b. In this embodiment, these drain ports are circular. The flush water accumulated in the external water tank 12 (and outside the internal water tank 14) flows through the first drain port 12a into the inner rim conduit 2e of the flush toilet body 2, while the flush water accumulated in the internal water tank 14 flows through the second drain port 12b into the jet conduit 2f of the flush toilet body 2.

[0040] The internal water tank 14 is arranged on the bottom surface of the external water tank 12, and the lower part of the internal water tank 14 is immersed in the flush water accumulated in the external water tank 12. In addition, a circular drain outlet 14a is formed on the bottom surface of the internal water tank 14. The drain outlet 14a of the internal water tank 14 is arranged in a concentric circle in a manner integrated with the second drain outlet 12b provided in the external water tank 12. That is, in this embodiment, the center of the circular second drain outlet 12b is aligned with the center of the circular drain outlet 14a when viewed from above. Therefore, the flush water in the internal water tank 14 flows into the jet water conduit 2f of the flush toilet body 2 through the drain outlet 14a of the internal water tank 14 and the second drain outlet 12b of the external water tank 12.

[0041] Furthermore, if Figure 3 As shown, in this embodiment, the drain outlet 14a of the internal water tank 14 is formed by a drain outlet-forming member 14b, which is formed separately from the main body of the internal water tank 14. This drain outlet-forming member 14b is a cylindrical member that is watertightly attached to the bottom surface of the internal water tank 14 and forms the drain outlet 14a on the inside. Furthermore, a seating surface is provided at the top end of the drain outlet-forming member 14b, upon which the second drain valve 10 seats, thereby closing the drain outlet 14a. Therefore, in this embodiment, the seating surface on which the second drain valve 10 seats is formed by a separate component from the internal water tank 14.

[0042] In addition, if Figure 2 As shown, the external water tank 12 of the flush water tank device 4 is configured such that, in a top view, the width direction of the flush toilet body 2 ( Figure 2 The arrow W direction in the figure is long and the depth direction ( Figure 2 Furthermore, the inner water tank 14 disposed within the outer water tank 12 is configured to be long in the width direction and short in the depth direction, also when viewed from above, and is formed into a special shape to avoid the first drain valve 8 and the float valve 16.

[0043] Specifically, in this embodiment, the front and left end portion ( Figure 2 The lower left corner of the figure) is provided with a float valve 16, and the front and right end ( Figure 2The first drain valve 8 is arranged in the lower right corner of the image. In the top view, the internal water tank 14 is provided with a cutout 14c and a cutout 14d at the front of both ends in the width direction to avoid the float valve 16 and the first drain valve 8.

[0044] That is, the upper portion of the inner water tank 14, when viewed from above, has substantially the same shape as the outer water tank 12. Furthermore, a U-shaped cutout 14c is provided in the portion of the inner water tank 14 where the first drain valve 8 is located, and a cutout 14d is provided in the portion where the float valve 16 is located, so as to prevent interference with the inner water tank 14.

[0045] Furthermore, in this embodiment, the upper end of the inner tank 14 is constructed to have a uniform height throughout its entire circumference. Therefore, when the wash water supplied to the inner tank 14 overflows and flows into the outer tank 12, the wash water flows over the entire circumference of the upper edge of the inner tank 14 and into the outer tank. This significantly extends the length of the overflow edge of the inner tank 14. Preferably, the inner tank 14 is constructed so that the wash water overflows from two or more edges of the inner tank 14 and flows into the outer tank 12.

[0046] Furthermore, if Figure 2 As shown, in this embodiment, the outer peripheral wall of the inner water tank 14 is formed to have a shape substantially identical to the inner peripheral wall of the outer water tank 12, and the gap between the outer peripheral wall of the inner water tank 14 and the inner peripheral wall of the outer water tank 12 is small. As a result, in this embodiment, the outer periphery of the upper end of the inner water tank 14 is longer than the outer periphery of the upper end of the outer water tank 12 (the outer periphery is longer due to the provision of notches 14c and 14d in the inner water tank 14). This allows the overflow edge of the inner water tank 14 to be extremely long when the wash water overflows and flows into the outer water tank. Preferably, the outer periphery of the upper end of the inner water tank 14 is at least half the length of the outer periphery of the upper end of the outer water tank 12.

[0047] On the other hand, Figure 3 As shown, steps are formed on both sides of the width direction of the internal water tank 14, and the width of the lower portion is narrower. In other words, the internal water tank 14 is constructed so as to be roughly T-shaped when viewed from the front, and at least the lower portion of the internal water tank 14 is immersed in the cleaning water stored in the external water tank 12. In other words, the internal water tank 14 is constructed so that the cross-sectional area changes in the height direction, and the horizontal cross-sectional area of ​​the upper portion of the internal water tank 14 is larger than the horizontal cross-sectional area of ​​the lower portion. In addition, by making the upper portion of the internal water tank 14 larger, a large amount of cleaning water with high potential energy is accumulated in the internal water tank 14. As a result, the head pressure of the cleaning water discharged from the internal water tank 14 can be increased, thereby increasing the instantaneous flow rate of the discharged cleaning water.

[0048] By forming the inner tank 14 into a special shape using resin in this manner, the depth dimension of the flush water tank assembly 4 is reduced while ensuring a sufficient volume for the inner tank 14. Furthermore, since the inner tank 14 made of resin can have thinner walls than when formed of ceramic, the volume within the outer tank 12 can be effectively utilized.

[0049] Next, the first drain valve 8, which serves as the first water discharge / stop switching mechanism, is a valve body configured to open or close the first drain port 12a provided in the external water tank 12. By pulling the first drain valve 8 upward, the first drain port 12a is opened. As a result, the flush water in the external water tank 12 is discharged to the inner rim water conduit 2e ( Figure 1 ) and spit out from the inner edge water spout 2c. Therefore, the first drain valve 8 as the first water spouting and stopping switching mechanism switches the supply or stop of the flush water accumulated in the external water tank 12 to the flush toilet body 2.

[0050] It should be noted that, in this embodiment, the user rotates the lever-type flush handle 4a provided on the flush water tank device 4, thereby pulling the ball chain 8a ( Figure 3 ), and then pull up the first drain valve 8. It should be noted that, as a modified example, the present invention can also be constructed in a manner such that the first drain valve 8 is pulled up based on a control signal from a remote control device (not shown) or a detection signal from a human body sensor (not shown) to perform cleaning.

[0051] Furthermore, in this embodiment, the first drain valve 8 is provided as the first water spouting / stopping switching mechanism. However, a structure other than the first drain valve 8 can also be used as the first water spouting / stopping switching mechanism. For example, a jet pump (not shown) can be used as the first water spouting / stopping switching mechanism, which causes flush water stored in the external tank 12 to flow into the flush toilet body. In this case, a nozzle (not shown) of the jet pump is disposed in the external tank 12, and a portion of the flush water supplied via a water supply valve such as the float valve 16 is ejected from the nozzle. By ejecting flush water from the nozzle in the external tank 12, flush water stored in the external tank 12 is drawn in, and the jet pump causes the flush water in the external tank 12 to flow into the flush toilet body. In addition to such a jet pump (not shown), any structure for switching the supply of flush water to the flush toilet body 2 or stopping the supply can be used as the first water spouting / stopping switching mechanism.

[0052] Next, the second drain valve 10, which serves as the second water discharge / stop switching mechanism, is a valve body configured to open or close the drain port 14a provided in the internal water tank 14. By pulling the second drain valve 10 upward, the second drain valve 10 is separated from the seat surface of the drain port 14a, thereby opening the drain port 14a. As a result, the flush water in the internal water tank 14 is discharged from the drain port 14a and flows into the jet water conduit 2f ( Figure 1 Therefore, the second drain valve 10 as the second water spouting / stopping switching mechanism switches the supply or stop of the flush water stored in the internal tank 14 to the flush toilet body 2.

[0053] Furthermore, in this embodiment, the second drain valve 10 is configured to be pulled up from the drain outlet 14a by a hydraulic drive mechanism 18. Specifically, the second drain valve 10 comprises a valve body having an upwardly extending valve shaft 10a, and the hydraulic drive mechanism 18 pulls up the valve shaft 10a. Furthermore, when the second drain valve 10 is pulled up to a predetermined height, it is disconnected from the hydraulic drive mechanism 18 and then slowly lowered to close the drain outlet 14a. It should be noted that the structure of the hydraulic drive mechanism 18 will be described later, but the present invention is also applicable to flush water tank devices that do not include the hydraulic drive mechanism 18.

[0054] Furthermore, in this embodiment, a second drain valve 10 is provided as the second water spouting / stopping switching mechanism. However, a structure other than the second drain valve 10 can also be used as the second water spouting / stopping switching mechanism. For example, a jet pump (not shown) can be used as the second water spouting / stopping switching mechanism, which causes flush water accumulated in the internal water tank 14 to flow into the flush toilet body. In this case, a nozzle (not shown) of the jet pump is disposed in the internal water tank 14, and a portion of the flush water supplied via a water supply valve such as a float valve 16 is ejected from the nozzle. By ejecting flush water from the nozzle within the internal water tank 14, flush water accumulated in the internal water tank 14 is drawn in, and the jet pump causes the flush water in the internal water tank 14 to flow into the flush toilet body. In addition to such a jet pump (not shown), any structure for switching the supply of flush water to the flush toilet body 2 or stopping the supply can be used as the second water spouting / stopping switching mechanism.

[0055] Furthermore, the float valve 16 as a water supply valve is configured to allow washing water supplied from the water supply source 6 to flow in through the inflow pipe 16 a and to switch supply or stop supply of washing water to be stored in the external tank 12 and the internal tank 14 .

[0056] Next, refer to Figure 4 , the structure of the float valve 16 will be described.

[0057] like Figure 4As shown, the float valve 16 includes a main body 20 connected to an inlet pipe 16a and an outlet pipe 16b; a main valve element 20a disposed within the main body 20; a valve seat 20b on which the main valve element 20a is seated; an arm 24 rotated by a float 22; and a pilot valve 26 moved by the rotation of the arm 24. Specifically, the float valve 16 is configured to include a float 22 that operates in conjunction with the water level within the flush water tank assembly 4. When the float 22 descends to a predetermined position, flush water is supplied to the hydraulic drive mechanism 18.

[0058] The main body 20 is a component with a connection to the inlet pipe 16a at its lower portion and a connection to the outlet pipe 16b on one side. A valve seat 20b is formed inside the main body 20, communicating with the outlet pipe 16b connected to the connection. Furthermore, a main valve body 20a is located inside the main body 20 to open and close the valve seat 20b. When opened, tap water flowing into the inlet pipe 16a passes through the valve seat 20b and flows out of the outlet pipe 16b. The outlet pipe 16b is connected to the hydraulic drive mechanism 18.

[0059] The main valve body 20a is a diaphragm valve body in a generally circular plate shape, and is mounted in the main body 20 so as to be seated and unseated relative to the valve seat 20b. In addition, a drain hole 20c is provided on the peripheral edge of the main valve body 20a. Furthermore, in the main body 20, a drain hole 20c is provided on the opposite side of the valve seat 20b relative to the main valve body 20a. Figure 4 A pressure chamber 20d is formed (left side in the center). Specifically, the pressure chamber 20d is defined by the inner wall surface of the main body 20 and the main valve body 20a. When the pressure in the pressure chamber 20d increases, the main valve body 20a is pressed toward the valve seat 20b by the pressure, and is seated on the valve seat 20b.

[0060] Furthermore, the pressure passage 20e extends upward so as to communicate with the pressure chamber 20d provided in the main body 20, and a pilot valve port 26a is provided at the upper end of the pressure passage 20e. The pilot valve port 26a is open upward and is opened or closed by the pilot valve 26.

[0061] Meanwhile, the float 22 is supported by an arm 24, which is rotatably supported by a support shaft 24a. Furthermore, the pilot valve 26 is connected to the arm 24 and moves vertically as the arm 24 rotates. In this embodiment, the float 22 is located in the external tank 12 and moves vertically according to the water level within the external tank 12. Therefore, when the water level within the external tank 12 rises above a predetermined level, the float 22 is pushed upward, causing the pilot valve 26 to move downward and seat on the pilot valve port 26a, closing it. On the other hand, when the flush water within the external tank 12 drains, lowering the water level, the float 22 moves downward, causing the pilot valve 26 to move upward, opening the pilot valve port 26a. Therefore, when the water level within the external tank 12 is higher than the predetermined level and the toilet is on standby for flushing, the pilot valve port 26a of the main body 20 is closed.

[0062] Furthermore, the tap water flowing 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 drain hole 20c of the main valve body 20a. However, when the pilot valve port 26a is closed by the pilot valve 26, the tap water flowing into the pressure chamber 20d from the drain hole 20c has no way to flow out, and the pressure in the pressure chamber 20d rises. In this way, when the pressure in the pressure chamber 20d rises, the main valve body 20a is pushed toward the valve seat 20b (towards the valve seat 20b) by the pressure. Figure 4 The valve seat 20b is pressed by the main valve body 20a.

[0063] On the other hand, when the first drain valve 8 is opened by the flushing operation and the water level in the external water tank 12 falls below the predetermined level, the float 22 drops, the pilot valve 26 moves upward, and the pilot valve port 26a opens. When the pilot valve port 26a opens, the water in the pressure chamber 20d flows out from the pilot valve port 26a, and the pressure in the pressure chamber 20d decreases. As a result, the main valve body 20a is separated from the valve seat 20b (towards the Figure 4 Like this, when the pilot valve port 26a is open, the pressure in the pressure chamber 20d does not rise, and therefore, the valve seat 20b becomes the open state.

[0064] Next, refer to Figure 5 , the structure of the water pressure drive mechanism 18 is explained.

[0065] The hydraulic drive mechanism 18 is configured to actuate the second drain valve 10 using the water pressure of the flush water supplied from the tap water pipe to the flush water tank assembly 4. Specifically, the hydraulic drive mechanism 18 comprises a cylinder 18a, into which water supplied from the float valve 16 flows; a piston 18b slidably disposed within the cylinder 18a; and a rod 28 protruding from the lower end of the cylinder 18a and used to actuate the second drain valve 10. Furthermore, a spring 18c is disposed within the cylinder 18a, biasing the piston 18b downward. A gasket is mounted on the piston 18b to ensure watertightness between the inner wall of the cylinder 18a and the piston 18b. Furthermore, a clutch mechanism 30 is provided at the lower end of the rod 28, which connects and disconnects the rod 28 from the valve shaft 10a of the second drain valve 10.

[0066] Cylinder 18a is a cylindrical component with its axis aligned vertically. It slidably houses piston 18b. Furthermore, the lower end of cylinder 18a is connected to an outflow tube 16b extending from float valve 16. Wash water flowing from float valve 16 flows into cylinder 18a. Consequently, the water flowing into cylinder 18a pushes piston 18b upward against the force of spring 18c.

[0067] Meanwhile, an outflow hole is provided at the top end of cylinder 18a, and water supply pipe 32 is connected to this outflow hole. Therefore, when water flows into cylinder 18a from outflow pipe 16b connected to the bottom of cylinder 18a, piston 18b is pushed upward from the bottom of cylinder 18a. Furthermore, when piston 18b is pushed above the outflow hole, the water flowing into cylinder 18a flows out of the outflow hole into water supply pipe 32.

[0068] The water supply pipe 32 is a pipe extending downward from an outflow hole provided at the upper end of the cylinder 18a. The washing water flowing out of the cylinder 18a flows into the internal water tank 14 from the water supply port 32a at the lower end of the water supply pipe 32. The water supply port 32a at the lower end of the water supply pipe 32 is located below the water surface of the washing water in the internal water tank 14 during standby operation. Therefore, the float valve 16 is configured to allow washing water to flow into the internal water tank 14 from the water supply port 32a provided below the water surface of the internal water tank 14. In this way, by supplying washing water into the internal water tank 14 from a position below the water surface of the accumulated washing water, fluctuations in the water surface of the washing water flowing into the internal water tank 14 can be suppressed.

[0069] The rod 28 is a rod-shaped member connected to the bottom of the piston 18b. It extends through a through-hole formed in the bottom surface of the cylinder 18a, projecting downward from the cylinder 18a. Furthermore, the lower end of the rod 28 is connected to the valve shaft 10a of the second drain valve 10 via a clutch mechanism 30. The rod 28 connects the piston 18b to the second drain valve 10. Therefore, when water flows into the cylinder 18a and the piston 18b is pushed upward, the rod 28 connected to the piston 18b lifts the second drain valve 10 upward, opening it.

[0070] Furthermore, a gap is provided between the rod 28 protruding from the bottom of the cylinder 18a and the inner wall of the through-hole of the cylinder 18a. Some of the water flowing into the cylinder 18a flows out through this gap. The water flowing out of the gap flows into the internal water tank 14. It should be noted that because this gap is narrow and the flow resistance is high, even when water is flowing out of the gap, the pressure in the cylinder 18a rises due to the water flowing into the cylinder 18a from the outflow pipe 16b, causing the piston 18b to be pushed upward against the force of the spring 18c.

[0071] Furthermore, the clutch mechanism 30 detachably couples the rod 28 to the second drain valve 10. When the second drain valve 10 and the rod 28 are raised to a predetermined distance, the clutch mechanism 30 disconnects the valve shaft 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. As the water level in the internal tank 14 decreases, the second drain valve 10 descends, closing the drain port 14a of the internal tank 14.

[0072] Next, the first reference Figure 6 , the function of the flush toilet device 1 according to the embodiment of the present invention will be described.

[0073] Figure 6 This is a timing chart showing the operation of the flush toilet apparatus 1 according to the embodiment of the present invention, and shows, from top to bottom, the jet water spouting state, the rim water spouting state, and the float valve state.

[0074] First, in the toilet flushing standby state, the first drain port 12a of the external tank 12 and the drain port 14a of the internal tank 14 are closed by the first drain valve 8 and the second drain valve 10, respectively. In addition, in the standby state, the flush water is accumulated in the external tank 12 and the internal tank 14 to the predetermined initial water level. The initial water level of the external tank 12 is higher than the predetermined water level, and thus the main body 20 ( Figure 4) is in a closed state, and the valve seat 20b is closed by the main valve body 20a. In addition, in this embodiment, the initial water level of the internal water tank 14 is located at a higher position than the initial water level of the external water tank 12, and the washing water accumulates in the internal water tank 14 to approximately the upper end.

[0075] Next, in Figure 6 At time t1, if the user presses the lever type flush handle 4a ( Figure 3 ) is rotated, the ball chain 8a connected thereto pulls up the first drain valve 8. As a result, the first drain valve 8 is separated from the first drain port 12a, and the first drain port 12a is opened. When the first drain port 12a is opened, the washing water accumulated in the external water tank 12 (outside the internal water tank 14) flows from the first drain port 12a into the inner rim water conduit 2e ( Figure 2 ) and spit out from the inner edge water spouting port 2c. The inner edge water spouting from the inner edge water spouting port 2c forms a swirling flow on the waste receiving surface of the bowl portion 2a, thereby cleaning the waste receiving surface.

[0076] The washing water is discharged from the first drain port 12a, and the water level in the external tank 12 is lowered. As a result, the float 22 of the float valve 16 is lowered, and the pilot valve 26 ( Figure 4 ) is opened. As a result, the pressure in the pressure chamber 20d decreases and the main valve body 20a opens, so that the washing water is supplied to the water pressure drive mechanism 18 through the outflow pipe 16b.

[0077] When washing water is supplied to the hydraulic drive mechanism 18, it flows into the cylinder 18a ( Figure 5 ) in the inner tank 14, pushing piston 18b upward against the force of spring 18c. This causes rod 28 connected to piston 18b to pull up valve shaft 10a of second drain valve 10, opening outlet 14a of internal tank 14. In other words, second drain valve 10 is driven and opened by the pressure of tap water supplied via float valve 16.

[0078] Therefore, in Figure 6 At time t2, the outlet 14a is opened, and the washing water accumulated in the internal water tank 14 flows into the jet water conduit 2f ( Figure 2 ) and is discharged from the jet water outlet 2d. The jet water from the jet water outlet 2d fills the drain trap conduit 2b with water, inducing a siphon effect. This siphon effect draws remaining water and waste within the bowl 2a into the drain trap conduit 2b and discharges it to the sewage pipe (not shown).

[0079] When drain port 14a is closed, the interior of jet water conduit 2f is filled with wash water up to the level of the accumulated water in bowl 2a, and no wash water is present above the accumulated water level. Therefore, before second drain valve 10 is opened, no wash water is present at the upstream end of jet water conduit 2f.

[0080] Opening the second drain valve 10 quickly fills the empty space within the jet conduit 2f with water, allowing the water to be quickly discharged from the jet spout 2d. In particular, in this embodiment, the upper cross-sectional area of ​​the internal tank 14 is larger than the lower cross-sectional area, resulting in a high volume at the higher position. Consequently, a large volume of water at a high head pressure can flow into the jet conduit 2f, increasing the instantaneous flow rate of the water discharged from the jet spout 2d.

[0081] On the other hand, when the second drain valve 10 is pulled up to a predetermined height together with the piston 18b of the hydraulic drive mechanism 18, the clutch mechanism 30 ( Figure 5 ), and the valve shaft 10a of the second drain valve 10 is disconnected from the rod 28. As a result, the second drain valve 10 descends toward the drain port 14a as the water level in the internal water tank 14 decreases. Figure 6 At time t3, the second drain valve 10 is seated on the discharge port 14a, and the discharge port 14a is closed. As a result, the jet water spouting from the jet water spouting port 2d is stopped.

[0082] When the main valve body 20a of the float valve 16 is open, the washing water supplied from the water supply source 6 (tap water pipe) is supplied to the hydraulic drive mechanism 18 through the float valve 16 and is supplied to the hydraulic drive mechanism 18 through the water supply pipe 32 ( Figure 5 ) and flows into the internal water tank 14. In the state where the second drain valve 10 is open, since the flow rate of the washing water flowing out of the discharge port 14a of the internal water tank 14 is greater than the flow rate of the washing water flowing into the internal water tank 14 through the water supply port 32a of the water supply pipe 32, the water level in the internal water tank 14 is lowered. Figure 6 At time t3 , after the jet water spouting stops (after the second drain valve 10 is closed), the water level in the internal tank 14 rises due to the flush water flowing in from the water supply pipe 32 .

[0083] On the other hand, since the first drain valve 8 is still open, the washing water in the external tank 12 flows out from the first drain port 12a, and the water level in the external tank 12 continues to decrease. Figure 6At time t4, when the water level in the external water tank 12 drops to the predetermined water stop level, the first drain valve 8 is seated on the first drain port 12a, thereby closing the first drain valve 8. This stops the rim water spouting from the rim water spouting port 2c.

[0084] Furthermore, since the main valve body 20a of the float valve 16 remains open even after the first drain valve 8 is closed, the wash water supplied from the water supply source 6 (tap water pipe) flows through the float valve 16 and the hydraulic drive mechanism 18 from the water supply port 32a of the water supply pipe 32 into the internal water tank 14. At this time, since the water supply port 32a of the water supply pipe 32 opens toward the lower portion of the internal water tank 14, it is located below the surface of the wash water accumulated in the internal water tank 14, and the wash water flows from the water into the internal water tank 14. As a result, splashing of the wash water and fluctuations in the water surface within the internal water tank 14 when the wash water flows from the water supply port 32a into the internal water tank 14 can be suppressed.

[0085] The water level in the internal water tank 14 rises due to the inflow of the washing water. Figure 6 At time t5, the inner tank 14 is filled with water, and the wash 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 throughout its entire circumference. Therefore, the wash water overflows from the entire circumference of the inner tank 14 and flows into the outer tank 12. In this embodiment, since the rim of the inner tank 14 through which the wash water overflows is constructed to be extremely long, the water level of the wash water flowing through the rim of the inner tank 14 can be kept low. In other words, the wash water overflowing from the inner tank 14 forms a thin film of water on the rim of the inner tank 14 while flowing over the rim of the inner tank 14 and into the outer tank 12. In other words, since the rim of the inner tank 14 is formed to be long, the wash water flowing in through the water supply port 32a can be allowed to flow out at a predetermined flow rate simply by forming a thin film of water on the rim.

[0086] Then, the water level in the external water tank 12 starts to rise as the washing water flows into the external water tank 12. Next, when the water level in the external water tank 12 rises to a predetermined level, the float 22 of the float valve 16 rises, and the pilot valve 26 ( Figure 4 ) is closed. In this way, if the pilot valve 26 is closed, the washing water flowing into the pressure chamber 20d from the discharge hole 20c of the main valve body 20a provided in the float valve 16 cannot flow out, and the pressure in the pressure chamber 20d rises. Figure 6 At time t6, the main valve body 20a is pressed by the pressure in the pressure chamber 20d and seats on the valve seat 20b, thereby closing the main valve body 20a. As a result, the water supply from the water supply source 6 to the hydraulic drive mechanism 18 via the float valve 16 is stopped, and the supply of washing water to the internal water tank 14 is stopped.

[0087] If the water supply to the hydraulic drive mechanism 18 is stopped, the piston 18b ( Figure 5 ) is pushed down by the force of spring 18c. Rod 28 attached to piston 18b also lowers accordingly. When rod 28 is lowered to a predetermined position, it is reconnected to valve shaft 10a of second drain valve 10 via clutch mechanism 30. As described above, a single toilet flush is completed, and flush toilet apparatus 1 returns to its toilet flush standby state.

[0088] According to the flush water tank assembly 4 of the embodiment of the present invention, the float valve 16 is configured to supply flush water to the inner tank 14. The flush water supplied to the inner tank 14 overflows from the entire circumference of the inner tank 14 and flows into the outer tank 12. This allows the overflow edge of the flush water to be extended, thereby keeping the level of the flush water flowing over the edge of the inner tank 14 low. As a result, the space above the inner tank 14 can be set lower, allowing the flush water tank assembly 4 to have a low profile.

[0089] In addition, according to the flush water tank device 4 of this embodiment, since the length of the outer periphery of the upper end of the internal water tank 14 is configured to be more than 1 / 2 of the length of the outer periphery of the upper end of the external water tank 12, the edge of the internal water tank 14 for overflow of flush water can be set to be sufficiently long, thereby enabling the water level of the flush water flowing through the edge of the internal water tank 14 to be suppressed to a lower level.

[0090] Furthermore, according to the flush water tank device 4 of this embodiment, since the cross-sectional area of ​​the upper portion of the internal tank 14 is larger than that of the lower portion, the edge of the internal tank 14, through which the flush water overflows, can be configured to be longer. As a result, the level of the flush water flowing through the edge of the internal tank 14 can be kept low. Furthermore, since the cross-sectional area of ​​the upper portion of the internal tank 14 is larger than that of the lower portion, a large amount of flush water with a high head pressure accumulates in the internal tank 14. Consequently, the instantaneous flow rate of flush water discharged from the internal tank 14 can be increased, allowing the flush water to effectively flush the toilet body 2.

[0091] Furthermore, according to the flush water tank assembly 4 of this embodiment, since the float valve 16 is configured to allow flush water to flow into the inner water tank 14 from the water supply port 32a, which is located below the water surface of the inner water tank 14, it is possible to suppress fluctuations in the flush water flowing from the water supply port 32a into the inner water tank 14. As a result, even when the space above the inner water tank 14 is set low, the risk of equipment arranged above the inner water tank 14 being wetted by water can be reduced, thereby enabling the flush water tank assembly 4 to have a low profile.

[0092] Furthermore, according to the flush water tank device 4 of this embodiment, since the length of the outer periphery of the upper end of the internal water tank 14 is configured to be longer than the length of the outer periphery of the upper end of the external water tank 12, the edge of the internal water tank 14 for overflow of flush water can be set to be extremely long, thereby enabling the water level of the flush water flowing through the edge of the internal water tank 14 to be suppressed to a sufficiently low level.

[0093] The above describes a flush water tank device according to an embodiment of the present invention, and a flush toilet device equipped with the flush water tank device. However, various modifications can be made to the above embodiment. In particular, in the above embodiment, flush water accumulated in the inner tank is discharged from the jet spouting port, and flush water accumulated in the outer tank is discharged from the inner rim spouting port. In contrast, as a modified example, the present invention can be constructed in such a manner that flush water from the inner tank is discharged from the inner rim spouting port, and flush water from the outer tank is discharged from the jet spouting port. Alternatively, the present invention can also be applied to a flush water tank device that supplies flush water to a flush toilet body having spouting ports other than the inner rim spouting port and the jet spouting port.

[0094] In addition, in the above embodiment, a float valve is used as the water supply valve for switching the supply or stopping of the washing water to be stored in the external water tank and the internal water tank, but a water supply valve other than a float valve can also be used. Furthermore, in the above embodiment, the second drain valve is driven by a hydraulic drive mechanism, but it is not necessary to have a hydraulic drive mechanism.

[0095] Explanation of symbols:

[0096] 1. Water-flushing toilet device

[0097] 2. Water-washing toilet body

[0098] 2a Pelvis

[0099] 2b drainage elbow pipeline

[0100] 2c inner edge water outlet

[0101] 2D jet water outlet

[0102] 2e inner edge waterway

[0103] 2f jet water channel

[0104] 4. Clean water tank device

[0105] 4a Lever flush handle

[0106] 6 Water supply source

[0107] 8. First drain valve (first water discharge and stop switching mechanism)

[0108] 8a spherical chain

[0109] 10 Second drain valve (second water discharge and stop switching mechanism)

[0110] 10a valve shaft

[0111] 12 external water tanks

[0112] 12a First drainage outlet

[0113] 12b Second drain outlet

[0114] 14 internal water tank

[0115] 14a Discharge outlet

[0116] 14b Drainage outlet forming component

[0117] 14c incision

[0118] 14d incision

[0119] 16 Float valve (water supply valve)

[0120] 16a Inflow pipe

[0121] 16b Outflow tube

[0122] 18. Hydraulic drive mechanism

[0123] 18a Cylinder

[0124] 18b piston

[0125] 18c spring

[0126] 20 Main body

[0127] 20a Main valve body

[0128] 20b valve seat

[0129] 20c drain hole

[0130] 20d pressure chamber

[0131] 20e pressure path

[0132] 22 buoys

[0133] 24 arms

[0134] 24a support shaft

[0135] 26 pilot valve

[0136] 26a pilot valve port

[0137] 28 strokes

[0138] 30 Clutch mechanism

[0139] 32 water supply pipe

[0140] 32a Water supply port.

Claims

1. A flush water tank device, which is installed on a flush toilet body to supply flush water, characterized in that: It has: an external water tank storing flush water for supplying to the flush toilet body; an inner water tank made of resin, which is arranged inside the outer water tank and stores flush water to be supplied to the flush toilet body; a water supply valve for switching on or off the supply of the flushing water to be stored in the external water tank and the internal water tank; a first water discharge / stop switching mechanism, which is disposed in the external water tank and outside the internal water tank, and is used to switch the supply or stop of flush water accumulated in the external water tank to the flush toilet body; and The second water discharge and stop switching mechanism is arranged in the internal water tank and is used to switch the supply or stop of the flush water accumulated in the internal water tank to the flush toilet body. The water supply valve is configured to supply flush water to the inner tank, and the flush water supplied to the inner tank overflows from two or more edges of the inner tank and flows into the outer tank.

2. The flush water tank device according to claim 1, wherein: The inner tank is configured such that the length of the outer periphery of the upper end thereof is equal to or greater than 1 / 2 of the length of the outer periphery of the upper end of the outer tank.

3. The flush water tank device according to claim 1, wherein: The inner tank is configured such that a cross-sectional area varies in a height direction, and an upper portion of the inner tank has a cross-sectional area larger than a lower portion.

4. The flush water tank device according to claim 1, wherein: The water supply valve is configured to allow flush water to flow into the inner tank from a water supply port provided below the water surface of the inner tank.

5. The flush water tank device according to claim 1, wherein: The inner tank is configured such that the length of the outer periphery of the upper end thereof is longer than the length of the outer periphery of the upper end of the outer tank.

6. A flush toilet device that performs flushing using flush water stored in a flush water tank, characterized in that: It has: A flush toilet body, which is provided with a bowl, an inner edge water spout, and a jet water spout; and The flush water tank device according to any one of claims 1 to 5 supplies flush water to the rim water spouting port and the jet water spouting port of the flush toilet body.

Images