Flush toilet bowl device

Abstract

To provide a flush toilet bowl device capable of suppressing occurrence of noise between a seal member and an inner wall surface of a cylinder.SOLUTION: The invention is a flush toilet bowl device 1 that washes a toilet bowl with washing water fed from a water supply source and discharges dirt, and has a toilet bowl body 2 and a water pressure drive mechanism 16 to discharge the washing water from a water discharge port provided on a bowl part 2a using a feed water pressure of the washing water from the water supply source 6. The water pressure drive mechanism 16 comprises: a cylinder 16a into which the washing water from the water supply source 6 flows; a piston 16b that is disposed in the cylinder 16a and moved by a feed water pressure of the washing water flowed into the cylinder 16a; and a seal member 16d that is disposed on the piston 16b and seals between the piston 16b and an inner wall surface 16e of the cylinder 16a. Noise suppressing means for suppressing noise occurring between the seal member 16d and the inner wall surface 16e of the cylinder 16 is provided on the water pressure drive mechanism 16.SELECTED DRAWING: Figure 4A

Description

[Technical Field]

[0001] The present invention relates to a flush toilet apparatus, and more particularly to a flush toilet apparatus that flushes a toilet bowl with flush water supplied from a water supply source and expels waste. [Background technology]

[0002] Conventionally, there has been known a flush toilet device equipped with a water pressure drive mechanism that uses the water supply pressure of flush water supplied from the water mains to open the drain valve, as described in Patent Document 1. The water pressure drive mechanism comprises a cylinder, a piston that is placed inside the cylinder and moves in conjunction with the drain valve, and a sealing member that is attached to the piston and seals the gap between the piston and the inner wall surface of the cylinder. In such a flush toilet device, when flush water flows into the cylinder from the water mains, the water supply pressure of the flush water acts on the piston, causing the piston to move together with the drain valve, opening the drain valve. [Prior art documents] [Patent documents]

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

[0004] However, in the flush toilet device described in Patent Document 1, when the piston moves inside the cylinder, stick-slip can occur between the sealing member and the inner wall surface of the cylinder, causing an abnormal squeaking noise. Stick-slip occurs when the sealing member repeatedly adheres to and slides against the inner wall surface of the cylinder as the piston moves inside the cylinder. This phenomenon is particularly noticeable when the inner wall surface of the cylinder applies a large sliding resistance to the movement of the piston.

[0005] Therefore, an object of the present invention is to provide a flush toilet apparatus that can suppress the generation of abnormal noise between the seal member and the inner wall surface of the cylinder. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a flush toilet device that flushes the toilet bowl with flush water supplied from a water supply source and discharges waste, and comprises a toilet body having a bowl portion and a drain trap pipe extending from the bottom of the bowl portion, and a water pressure drive mechanism that uses the water supply pressure of the flush water from the water supply source to discharge flush water from a spout provided in the bowl portion, the water pressure drive mechanism having a cylinder into which flush water from the water supply source flows, a piston that is placed within the cylinder and moves due to the water supply pressure, and a sealing member that is attached to the piston and seals between the piston and the inner wall surface of the cylinder, and the water pressure drive mechanism is characterized in that it is provided with noise suppression means for suppressing noise that occurs between the sealing member and the inner wall surface of the cylinder.

[0007] According to the present invention configured in this manner, the water hydraulic drive mechanism is provided with a noise suppression means for suppressing abnormal noise generated between the sealing member and the inner wall surface of the cylinder, thereby making it possible to suppress abnormal noise generated between the sealing member and the inner wall surface of the cylinder.

[0008] In the present invention, the surface roughness of the inner wall of the cylinder of the water hydraulic drive mechanism is preferably set to be equal to or greater than the surface roughness of the seal member.

[0009] According to the present invention configured in this manner, the surface roughness of the inner wall of the cylinder is set to be the same as or greater than the surface roughness of the sealing member, thereby reducing the area of ​​contact between the sealing member and the inner wall surface of the cylinder and suppressing the generation of abnormal noise due to the stick-slip phenomenon between the sealing member and the inner wall surface of the cylinder.

[0010] In addition, in the present invention, the sealing member is preferably configured to form a gap with the inner wall surface of the cylinder when no water supply pressure is acting within the cylinder, and to contact the inner wall surface of the cylinder when water supply pressure is acting within the cylinder.

[0011] According to the present invention configured in this manner, the seal member is configured to form a gap between itself and the inner wall surface of the cylinder when no water supply pressure is acting inside the cylinder, so that when wash water flows into the cylinder, the wash water flows into the gap, making the seal member more likely to slide against the inner wall surface of the cylinder, thereby suppressing the generation of abnormal noise due to the stick-slip phenomenon. On the other hand, the seal member is configured to come into contact with the inner wall surface of the cylinder when water supply pressure is acting inside the cylinder, ensuring watertightness between the piston and the cylinder.

[0012] In the present invention, the inner wall of the cylinder is preferably formed so as to be linear in the direction of movement of the piston.

[0013] According to the present invention configured in this manner, the inner wall of the cylinder is formed so as to be linear in the direction of piston movement, so that the frictional force generated between the sealing member and the inner wall surface of the cylinder is approximately constant, making it possible to suppress the generation of abnormal noise due to the stick-slip phenomenon.

[0014] In the present invention, the sealing member is preferably a U-packing.

[0015] According to the present invention configured as described above, the sealing member is a U-packing, and therefore, it is possible to suppress the generation of abnormal noise due to the stick-slip phenomenon in the U-packing.

[0016] In the present invention, preferably, the toilet further comprises a flush water tank having a water hydraulic drive mechanism disposed therein and storing flush water to be supplied to the toilet body, and a drain valve that moves in conjunction with the piston and opens and closes a drain outlet provided in the flush water tank.

[0017] According to the present invention configured in this manner, the toilet further comprises a flush water tank that stores flush water to be supplied to the toilet body and has a water pressure drive mechanism disposed inside, and a drain valve that moves in conjunction with the piston to open and close the drain outlet provided in the flush water tank, thereby making it possible to suppress the generation of abnormal noises when the drain outlet is opened and closed by the drain valve. [Effects of the Invention]

[0018] According to the flush toilet apparatus of the present invention, it is possible to prevent abnormal noise from occurring between the seal member and the inner wall surface of the cylinder. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a block diagram showing a flush toilet apparatus according to a first embodiment of the present invention. [Figure 2] FIG. 1 is a cross-sectional view showing the general configuration of a flush water tank provided in a flush toilet apparatus according to a first embodiment of the present invention. [Figure 3] FIG. 1 is a cross-sectional view showing the structure of a water pressure drive mechanism built into the flush water tank in a flush toilet apparatus according to a first embodiment of the present invention. [Figure 4A] FIG. 1 is a cross-sectional view showing the water pressure drive mechanism in the initial state in a flush toilet apparatus according to a first embodiment of the present invention. [Figure 4B] FIG. 1 is a cross-sectional view showing the water pressure drive mechanism in a flush toilet apparatus according to a first embodiment of the present invention, with flush water pressure acting inside the cylinder and the piston stationary. [Figure 5] FIG. 3 is a schematic diagram for explaining the operation of the water pressure drive mechanism of the flush toilet apparatus according to the first embodiment of the present invention. [Figure 6A] FIG. 10 is a cross-sectional view showing the water pressure drive mechanism in the initial state in a flush toilet apparatus according to a second embodiment of the present invention. [Figure 6B]FIG. 10 is a cross-sectional view showing the water pressure drive mechanism in a flush toilet apparatus according to a second embodiment of the present invention, with flush water pressure acting inside the cylinder and the piston moving. [Figure 6C] FIG. 10 is a cross-sectional view showing the water pressure drive mechanism in a flush toilet apparatus according to a second embodiment of the present invention, with flush water pressure acting inside the cylinder and the piston stopped. DETAILED DESCRIPTION OF THE INVENTION

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

[0021] As shown in Figure 1, a flush toilet apparatus 1 according to an embodiment of the present invention is made up of a toilet body 2, which is a flush toilet, and a flush water tank 4 located at the rear of this toilet body 2. The flush toilet apparatus 1 of this embodiment is configured so that flushing is performed by operating a lever handle 4a provided on the flush water tank 4.

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

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

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

[0025] Next, the internal structure of the flush water tank 4 will be described with reference to FIG. As shown in Figure 2, the flush water tank 4 has a first drain valve 10 that opens and closes the first drain outlet 4b, a second drain valve 12 that opens and closes the second drain outlet 4c, a ball tap 14, and a water hydraulic drive mechanism 16.

[0026] The flush water tank 4 is a tank configured to store flush water to be supplied to the toilet body 2, and has a first drain outlet 4b and a second drain outlet 4c formed at the bottom for discharging the stored flush water into the toilet body 2.

[0027] The first drain valve 10 is a valve body arranged to open and close the first drain outlet 4b, and the first drain outlet 4b is opened when the first drain valve 10 is pulled upward. This causes flush water in the flush water tank 4 to be discharged into the rim water conduit 2f of the toilet body 2 and then ejected from the rim spout 2d.

[0028] In this embodiment, when the user rotates the lever handle 4a provided on the flush water tank 4, a ball chain 10a (schematically shown in Figure 2) connected to the first drain valve 10 is pulled, and the first drain valve 10 is pulled up. In this embodiment, the first drain valve 10 is a valve body equipped with a float 10b, and after being pulled up from the first drain port 4b and opened, it gradually drops as the water level in the flush water tank 4 drops, and is configured to close when the water level drops to a predetermined level.

[0029] The second drain valve 12 is a valve body arranged to open and close the second drain outlet 4c, and the second drain outlet 4c is opened by pulling the second drain valve 12 upward. This causes flush water in the flush water tank 4 to be discharged into the jet water conduit 2g of the toilet body 2 and sprayed from the jet water outlet 2e.

[0030] In this embodiment, the second drain valve 12 is configured to be pulled up from the second drain port 4c by the water hydraulic drive mechanism 16. The second drain valve 12 is a valve body that includes a valve stem 12a that extends upward and a float ball 12b, and the valve stem 12a is pulled up by the water hydraulic drive mechanism 16. Then, when it has been pulled up to a predetermined height, it is disconnected from the water hydraulic drive mechanism 16 and gently descends as the water level in the flush water tank 4 drops, closing the second drain port 4c.

[0031] Furthermore, in this embodiment, float ball 12b of second drain valve 12 is attached at a higher position than float ball 10b of first drain valve 10, so it sits on second drain outlet 4c and closes it when the water level in flush water tank 4 is relatively high. In other words, when first drain valve 10 and second drain valve 12 move down as the water level in flush water tank 4 drops, second drain valve 12 sits on second drain outlet 4c first and is closed.

[0032] The ball tap 14 is configured so that cleaning water supplied from the water source 6 flows in through the inlet pipe 14a, and in this embodiment, due to the action of this ball tap 14, the second drain valve 12 opens later than the first drain valve 10.

[0033] Ball tap 14 has a main body to which inlet pipe 14a and outlet pipe 14b are connected, a diaphragm-type main valve element 20 arranged within this main body, a valve seat 22 on which this main valve element 20 sits, an arm element 26 that is rotated by a float 24, and a pilot valve 28 that is moved by the rotation of this arm element 26. In other words, ball tap 14 is equipped with float 24 that operates in conjunction with the water level in flush water tank 4, and is configured to supply flush water to water pressure drive mechanism 16 when float 24 drops to a predetermined position.

[0034] Next, the configuration of the water pressure drive mechanism 16 of the flush toilet apparatus 1 according to the first embodiment of the present invention will be explained with reference to FIG. Water pressure drive mechanism 16 is configured to drive second drain valve 12 using the water supply pressure of flush water supplied from the water main to flush water tank 4. Specifically, water pressure drive mechanism 16 has a cylinder 16a into which water supplied from ball tap 14 flows, a piston 16b movably disposed within cylinder 16a, and a piston shaft 30 that protrudes from the lower end of cylinder 16a and drives second drain valve 12. Furthermore, spring 16c is disposed inside cylinder 16a and urges piston 16b downward, and a seal member 16d is attached to piston 16b to ensure watertightness between cylinder 16a and piston 16b. Furthermore, a clutch mechanism 32 is provided at the lower end of piston shaft 30, and this clutch mechanism 32 connects and disconnects piston shaft 30 and valve shaft 12a of second drain valve 12.

[0035] Cylinder 16a is a cylindrical member whose axis is aligned vertically, and into which piston 16b is movably inserted. An inner wall surface 16e of cylinder 16a extends linearly in the direction of movement of piston 16b. Outlet pipe 14b extending from ball tap 14 is connected to the lower end of cylinder 16a, and flush water flowing out of ball tap 14 flows into cylinder 16a through inlet hole 16f. Therefore, piston 16b in cylinder 16a is pushed up against the biasing force of spring 16c by flush water flowing into cylinder 16a.

[0036] Meanwhile, an outlet hole 16g is provided at the upper end of cylinder 16a, and water supply pipe 34 communicates with the interior of cylinder 16a via this outlet hole 16g. Therefore, when flush water flows into cylinder 16a from inlet hole 16f provided at the lower end of cylinder 16a, piston 16b is pushed upward from below cylinder 16a. Then, when piston 16b is pushed up to a position above outlet hole 16g, flush water that has flowed into cylinder 16a flows out from outlet hole 16g into water supply pipe 34. Also, flush water that has flowed into water supply pipe 34 falls into flush water tank 4, and supplies flush water to flush water tank 4.

[0037] The piston shaft 30 is a rod-shaped member connected to the underside of the piston 16b, and extends through a through-hole 16h formed in the bottom surface of the cylinder 16a so as to protrude downward from within the cylinder 16a. In addition, the valve shaft 12a of the second drain valve 12 is connected to the lower end of the piston shaft 30 via a clutch mechanism 32, and the piston shaft 30 connects the piston 16b and the second drain valve 12. Therefore, when flush water flows into the cylinder 16a and pushes up the piston 16b, the piston shaft 30 connected to the piston 16b lifts up the second drain valve 12, and the second drain valve 12 opens.

[0038] Furthermore, a gap is provided between the shaft portion 30 of the piston that protrudes from below the cylinder 16a and the inner wall surface of the through-hole 16h of the cylinder 16a, and some of the flush water that flows into the cylinder 16a flows out from this gap. The flush water that flows out from the gap flows into the flush water tank 4. Note that this gap is relatively narrow and has high flow resistance, so even if flush water flows out from the gap, the pressure inside the cylinder 16a increases due to the flush water flowing into the cylinder 16a from the outflow pipe 14b, and the piston 16b is pushed up against the biasing force of the spring 16c.

[0039] Furthermore, a clutch mechanism 32 detachably connects the piston shaft 30 and the second drain valve 12. When the second drain valve 12 is lifted a predetermined distance together with the piston shaft 30, the clutch mechanism 32 is configured to disconnect the valve shaft 12a of the second drain valve 12 from the piston shaft 30. With the clutch mechanism 32 in a disengaged state, the second drain valve 12 is no longer linked to the movement of the piston 16b and the upper part of the piston shaft 30, and the second drain valve 12 descends as the water level in the flush water tank 4 drops.

[0040] Next, with new reference to Figures 4A and 4B, the configuration of the water pressure drive mechanism 16 of the flush toilet apparatus 1 according to the first embodiment of the present invention will be explained in detail. Figure 4A is a cross-sectional view showing the water pressure drive mechanism 16 in its initial state in a flush toilet apparatus 1 according to the first embodiment of the present invention, and Figure 4B is a cross-sectional view showing the water pressure drive mechanism 16 in a state in which flush water pressure is acting inside the cylinder 16a and the piston 16b is stationary in a flush toilet apparatus 1 according to the first embodiment of the present invention. In Figures 4A and 4B, the flow of flush water is indicated by arrows.

[0041] The seal member 16d is a rubber U-packing having a surface roughness (Ra) of 0.45 μm. In this embodiment, a U-packing is used as the seal member 16d, but an O-ring or the like may be used instead.

[0042] 4A, sealing member 16d is configured to create a gap S between it and inner wall surface 16e of cylinder 16a when no wash water pressure is acting inside cylinder 16a. As a result, when wash water flows into cylinder 16a, some of the wash water flows into gap S, making it easier for seal member 16d to slide against inner wall surface 16e of cylinder 16a.

[0043] 4B, seal member 16d is configured to expand radially when the pressure of cleaning water is acting inside cylinder 16a. As a result, when a predetermined time has passed since cleaning water flowed into cylinder 16a, seal member 16d expands radially due to the pressure of the cleaning water and comes into contact with inner wall surface 16e, thereby ensuring watertightness between piston 16b and cylinder 16a.

[0044] The cylinder 16a is formed from a composite material that combines a resin material and other materials. The static friction coefficient of the cylinder 16a is set to be greater than 0.2, preferably 0.35. The cylinder 16a has a relatively large static friction coefficient, and is set to have a larger static friction coefficient than if it were formed from a resin material alone. In this way, the cylinder 16a applies a relatively large sliding resistance to the seal member 16d compared to if it were formed from a resin material alone.

[0045] The surface roughness (Ra) of the cylinder 16a is 0.45 μm. In this way, the surface roughness of the cylinder 16a is set to be the same as the surface roughness of the seal member 16d. This prevents the stick-slip phenomenon from occurring between the seal member 16d and the inner wall surface 16e of the cylinder 16a. In this embodiment, the surface roughness of the cylinder 16a is set to be the same as the surface roughness of the seal member 16d, but it may also be set to be larger than the surface roughness of the seal member 16d.

[0046] The inner wall surface 16e of the cylinder 16a does not have a draft angle formed during manufacturing, and the inner wall surface 16e extends linearly, so that when the piston 16b moves inside the cylinder 16a, the friction force generated between the seal member 16d and the inner wall surface 16e of the cylinder 16a is almost constant.

[0047] When flush water from outlet pipe 14b connected to a water supply flows into cylinder 16a through inlet hole 16f (Fig. 4A), piston 16b inside cylinder 16a is pushed up by the flush water against the biasing force of spring 16c. When piston 16b is pushed up to a position above first outlet hole 16g (Fig. 4B), the flush water that has flowed into cylinder 16a flows out from first outlet hole 16g into water supply pipe 34. Furthermore, when the inflow of flush water from inlet hole 16f stops, piston 16b inside cylinder 16a, which had been pushed up by the water supply, is pushed down by the biasing force of spring 16c (Fig. 4A).

[0048] Next, with new reference to FIG. 5, the operation of the water pressure drive mechanism 16 of the flush toilet apparatus 1 according to the first embodiment of the present invention will be explained. Figure 5 is a schematic diagram for explaining the operation of the water pressure drive mechanism 16 of a flush toilet apparatus 1 according to a first embodiment of the present invention. Figure 5(a) shows a conventional cylinder 50a and seal member 50d, while Figure 5(b) shows the cylinder 16a and seal member 16d according to an embodiment of the present invention. Furthermore, the left figures of Figures 5(a) and (b) show the state before use, and the right figures show the state after use for a predetermined period of time.

[0049] First, referring to the left diagram of FIG. 5(a), in the prior art, before use, the surface roughness (Ra) of the cylinder 50a was 0.04 μm, and the surface roughness of the seal member 50d was 0.45 μm. As such, there was a relatively large difference (0.41 μm) between the surface roughness of the cylinder 50a and the surface roughness of the seal member 50d, and the surface roughness of the cylinder 50a was significantly smaller than the surface roughness of the seal member 50d. This resulted in a relatively large contact area between the seal member 50d and the cylinder 50a, which could cause a stick-slip phenomenon between the seal member 50d and the cylinder 50a.

[0050] Furthermore, referring to the right diagram of FIG. 5(a), after a predetermined period of use, the surface roughness (Ra) of the cylinder 50a is 0.04 μm, while the surface roughness of the seal member 50d has been worn down by friction to 0.16 μm. As such, there is a relatively large difference (0.12 μm) between the surface roughness of the cylinder 50a and the surface roughness of the seal member 50d, and the surface roughness of the cylinder 50a is smaller than the surface roughness of the seal member 50d. As a result, the contact area between the seal member 50d and the cylinder 50a is relatively large, which may cause a stick-slip phenomenon between the seal member 50d and the cylinder 50a.

[0051] Next, in this embodiment, referring to the left diagram of FIG. 5(b), before use, the surface roughness (Ra) of the cylinder 16a is 0.45 μm, and the surface roughness of the seal member 16d is 0.45 μm. In this way, the surface roughness of the cylinder 16a and the surface roughness of the seal member 16d are the same. This makes the contact area between the seal member 16d and the cylinder 16a relatively small, preventing stick-slip from occurring between the seal member 16d and the cylinder 50a.

[0052] Furthermore, referring to the right diagram of FIG. 5(b), after a predetermined period of use, the surface roughness (Ra) of the cylinder 16a is 0.45 μm, while the surface roughness of the seal member 16d has been worn down by friction to 0.16 μm. As such, there is a relatively large difference (0.29 μm) between the surface roughness of the cylinder 16a and the surface roughness of the seal member 16d. However, the surface roughness of the cylinder 16a is greater than the surface roughness of the seal member 16d. This results in a relatively small contact area between the seal member 16d and the cylinder 16a, preventing stick-slip from occurring between the seal member 50d and the cylinder 50a.

[0053] According to the flush toilet apparatus 1 of the first embodiment of the present invention, the water pressure drive mechanism 16 is provided with noise suppression means for suppressing noise generated between the seal member 16d and the inner wall surface 16e of the cylinder 16a. Specifically, the surface roughness of the inner wall of the cylinder 16a is set to be the same as or greater than the surface roughness of the seal member 16d. This reduces the area of ​​contact between the seal member 16d and the inner wall surface 16e of the cylinder 16a, making it possible to suppress the generation of noise due to the stick-slip phenomenon between the seal member 16d and the inner wall surface 16e of the cylinder 16a.

[0054] Furthermore, according to the flush toilet apparatus 1 of the first embodiment of the present invention, the sealing member 16d is configured to form a gap between itself and the inner wall surface 16e of the cylinder 16a when no flush water supply pressure is acting inside the cylinder 16a, so when flush water flows into the cylinder 16a, the flush water flows into this gap, making the sealing member 16d more likely to slide against the inner wall surface 16e of the cylinder 16a, and preventing noise from being generated by stick-slip.On the other hand, because the sealing member 16d is configured to come into contact with the inner wall surface 16e of the cylinder 16a when flush water supply pressure is acting inside the cylinder 16a, watertightness between the piston 16b and the cylinder 16a can be ensured.

[0055] According to the flush toilet device 1 of the first embodiment of the present invention, the inner wall of the cylinder 16a is formed so that it is linear in the direction of movement of the piston 16b, so the frictional force generated between the sealing member 16d and the inner wall surface 16e of the cylinder 16a is roughly constant, making it possible to suppress the generation of abnormal noise due to the stick-slip phenomenon.

[0056] Furthermore, according to the flush toilet apparatus 1 of the first embodiment of the present invention, the seal member 16d is a U-packing, which makes it possible to prevent the generation of abnormal noise caused by the stick-slip phenomenon in the U-packing.

[0057] The flush toilet device 1 of the first embodiment of the present invention further comprises a flush water tank 4 that stores flush water to be supplied to the toilet body 2 and has a water pressure drive mechanism 16 disposed therein, and a second drain valve 12 that moves in conjunction with the piston 16b to open and close the second drain outlet 4c provided in the flush water tank 4, thereby making it possible to prevent abnormal noises from being generated when the second drain outlet 4c is opened and closed by the second drain valve 12.

[0058] Next, a water pressure drive mechanism 116 for a flush toilet apparatus according to a second embodiment of the present invention will be described with reference to Figures 6A to 6C. The flush toilet apparatus of this embodiment differs from the first embodiment described above in that the water pressure drive mechanism 116 is provided at the branch point of the rim water channel 102f and the jet water channel 102g.

[0059] Figure 6A is a cross-sectional view showing water pressure drive mechanism 116 in its initial state in a flush toilet system according to the second embodiment of the present invention, Figure 6B is a cross-sectional view showing water pressure drive mechanism 116 in a state in which flush water pressure is acting on cylinder 116a and piston 116b is moving in a flush toilet system according to the second embodiment of the present invention, and Figure 6C is a cross-sectional view showing water pressure drive mechanism 116 in a state in which flush water pressure is acting on cylinder 116a and piston 116b is stationary in a flush toilet system according to the second embodiment of the present invention. In Figures 6A to 6C, the flow of flush water is indicated by arrows.

[0060] The flush toilet apparatus of this embodiment is not equipped with a flush water tank, and is configured so that flush water from a water supply source such as a water main is supplied directly to the rim water main 102f and jet water main 102g, and is then discharged from the rim water outlet and jet water outlet. At the branch point of this rim water main 102f and jet water main 102g, there is provided a water pressure drive mechanism 116 configured to switch the flow path using the water supply pressure of the flush water supplied from the water main.

[0061] The water hydraulic drive mechanism 116 has a cylinder 116a into which flush water supplied from the water line flows, a piston 116b movably arranged within this cylinder 116a, and a spring 116c arranged inside the cylinder 116a and biasing the piston 116b toward the inlet hole 116f. Furthermore, a seal member 116d is attached to the piston 116b to ensure watertightness between the cylinder 116a and the piston 116b.

[0062] When flush water from outflow pipe 114b, which is connected to a water supply, flows into cylinder 116a through inflow hole 116f (FIG. 6A), the flush water pushes piston 116b in cylinder 116a up against the biasing force of spring 116c. When piston 116b is pushed up to a position above first outflow hole 116g (FIG. 6B), the flush water that has flowed into cylinder 116a flows out from first outflow hole 116g into rim water conduit 102f. When piston 116b is further pushed up to a position above second outflow hole 116h (FIG. 6C), the flush water that has flowed into cylinder 116a flows out from first outflow hole 116g to the rim water conduit and from second outflow hole 116h into jet water conduit 102g.

[0063] The seal member 116d is a rubber U-packing with a surface roughness (Ra) of 0.45 μm, as in the first embodiment. The cylinder 116a has a surface roughness of 0.45 μm, as in the first embodiment, and is set to have the same surface roughness as the seal member 116d. This prevents stick-slip from occurring between the seal member 116d and the cylinder 116a.

[0064] According to the flush toilet apparatus of the second embodiment of the present invention, water pressure drive mechanism 116 is provided with noise suppression means for suppressing noise generated between seal member 116d and inner wall surface 116e of cylinder 116a. Specifically, the surface roughness of the inner wall of cylinder 116a is set to be the same as or greater than the surface roughness of seal member 116d. This reduces the area of ​​contact between seal member 116d and inner wall surface 116e of cylinder 116a, making it possible to suppress the generation of noise due to the stick-slip phenomenon between seal member 116d and inner wall surface 116e of cylinder 116a.

[0065] Although the embodiments of the present invention have been described above, various modifications can be made to the above-described embodiments. In particular, the first embodiment described above shows an example in which the present invention is applied to a water hydraulic drive mechanism that drives a drain valve, and the second embodiment described above shows an example in which the present invention is applied to a water hydraulic drive mechanism that switches flow paths, but the present invention is not limited to these and can be applied to other water hydraulic drive mechanisms. [Explanation of symbols]

[0066] 1. Flush toilet apparatus according to a first embodiment of the present invention 2 Toilet body 2a Bowl section 2c Drain trap pipe 2D Rim Spout 2e Jet spout 2F Rim Waterway 2g Jet Waterway 4 Cleaning water tank 4a Lever handle 4b First drain 4c Second drain 6 Water source 8 Stop valve 10. First drain valve 12 Second drain valve 14 Ball Tap 14a Inflow pipe 14b Outflow pipe 16 Water Hydraulic Drive Mechanism 16a cylinder 16b piston 16c spring 16d Sealing material 16e Inner wall surface of cylinder 16f Inflow hole 16g outflow hole 16h through hole S: Gap between the seal and the inner wall of the cylinder 166 Water pressure drive mechanism of a flush toilet apparatus according to a second embodiment of the present invention

Claims

1. A flush toilet device that flushes a toilet bowl with flush water supplied from a water supply source and discharges waste, a toilet body having a bowl portion and a drain trap pipe extending from a lower portion of the bowl portion; a water pressure drive mechanism that uses the water supply pressure of flush water from the water supply source to discharge flush water from a water discharge port provided in the bowl portion; Equipped with the water pressure drive mechanism has a cylinder into which flush water from the water supply source flows, a piston that is disposed within the cylinder and moves due to the water supply pressure, and a seal member that is disposed on the piston and seals the gap between the piston and the inner wall surface of the cylinder; A flush toilet apparatus characterized in that the water pressure drive mechanism is provided with noise suppression means for suppressing noise generated between the seal member and the inner wall surface of the cylinder.

2. 2. The flush toilet apparatus according to claim 1, wherein the surface roughness of the inner wall of the cylinder is set to be the same as or greater than the surface roughness of the sealing member.

3. The flush toilet apparatus according to claim 1, wherein the sealing member is configured to form a gap with the inner wall surface of the cylinder when the water supply pressure is not acting within the cylinder, and to come into contact with the inner wall surface of the cylinder when the water supply pressure is acting within the cylinder.

4. 4. The flush toilet apparatus according to claim 1, wherein the inner wall of the cylinder is formed so as to be linear in the direction of movement of the piston.

5. The flush toilet apparatus according to claim 1, wherein the sealing member is a U-packing.

6. a flush water tank in which the water pressure drive mechanism is disposed and which stores flush water to be supplied to the toilet body; a drain valve that moves in conjunction with the piston and opens and closes a drain port provided in the flush water tank; The flush toilet system of claim 1 further comprising:

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