Water-washable toilet

Abstract

The present invention aims to provide a flush toilet that can reliably discharge flushing water from the outlet and ensure the removal of waste. [Solution] The present invention provides a toilet bowl body 2 comprising a bowl portion 6 for receiving waste, a jet outlet 14 for discharging flushing water, a jet water channel 16 for guiding flushing water to the jet outlet 14, and a drain trap pipe for discharging waste; a flushing water tank 4 having a drain port 4c formed therein for discharging the stored flushing water to the toilet bowl body 2; and a drain valve device 33 for opening and closing the drain port 4c of the flushing water tank 4. The present invention also provides a main ventilation passage 40 provided in the jet water channel 16 for discharging air from the jet water channel 16 to the outside of the jet water channel 16, and an auxiliary ventilation passage 42 having an air inlet 42a with a smaller opening cross-sectional area than the air inlet 40a of the main ventilation passage 40 for discharging air from the jet water channel 16 after the main ventilation passage 40 has been sealed with flushing water.

Description

TECHNICAL FIELD

[0001] The present invention relates to a flush toilet, and more particularly to a flush toilet that discharges waste by washing with flush water. BACKGROUND ART

[0002] Conventionally, as described in Patent Document 1, a flush toilet is known that is provided with a jet spout that discharges flush water toward the inlet of a drain trap pipeline, and a jet water conduit for guiding the flush water from a flush water tank to the jet spout. In such a flush toilet, air remains in the jet water conduit in a standby state before the start of flushing. When flushing is started, flush water is supplied into the jet water conduit, and the air that has accumulated at that time is discharged from the jet spout together with the flush water. PRIOR ART DOCUMENTS PATENT DOCUMENTS

[0003] PATENT DOCUMENT 1 International Publication No. 2005 / 085538 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0004] However, in the flush toilet described in the aforementioned Patent Document 1, when flush water flows through the jet water conduit, the flow of the flush water is obstructed by the air accumulated in the entire flow path inside the jet water conduit. This causes a problem that the instantaneous flow rate of the flush water discharged from the jet spout decreases, and there is a possibility that waste cannot be sufficiently discharged. To solve this problem, it is conceivable to install a resin water guide member within the jet water channel. This water guide member extends downward from the drain port of the cleaning water tank. When cleaning water flows from the cleaning water tank into the water guide member, the cleaning water passes through the water guide member and is discharged into the jet water channel from the discharge opening. At this time, the discharge opening of the water guide member is sealed with cleaning water, trapping air within the jet water channel, causing it to move upward and accumulate. This separates the cleaning water flowing below the water channel from the air accumulated above the water channel, thereby preventing the accumulated air from obstructing the flow of cleaning water. However, if the flow rate of cleaning water flowing from the cleaning water tank into the water guide member increases, the discharge opening of the water guide member is sealed with cleaning water extremely quickly. As a result, an excessive amount of air accumulates within the jet water channel. This excess air creates flow resistance as the cleaning water flows through the jet water channel, reducing the instantaneous flow rate of cleaning water discharged from the jet outlet. This presents a problem: waste may not be adequately discharged.

[0005] Therefore, the present invention aims to provide a flush toilet that can reliably discharge flushing water from the outlet and ensure the removal of waste. [Means for solving the problem]

[0006] To solve the above-mentioned problems, the present invention provides a flush toilet that washes with flushing water and discharges waste, comprising: a toilet body comprising: a bowl portion for receiving waste; a water outlet provided in the bowl portion for discharging flushing water; a water channel for guiding flushing water to the water outlet; and a drain trap pipe connected to the lower part of the bowl portion for discharging waste; a flushing water tank for storing flushing water supplied to the toilet body and having a drain port formed therein for discharging the stored flushing water to the toilet body; and a drain valve device for opening and closing the drain port of the flushing water tank, wherein the present invention provides a main ventilation passage provided in the water channel for discharging air from the water channel to the outside of the water channel; and an auxiliary ventilation passage having an air inlet with a smaller opening cross-sectional area than the air inlet of the main ventilation passage for discharging air from the water channel after the main ventilation passage has been sealed with flushing water.

[0007] According to the present invention configured in this way, a main vent passage is provided within the water conduit for discharging air from the water conduit to the outside, and an auxiliary vent passage is provided, which has an air inlet with a smaller opening cross-sectional area than the air inlet of the main vent passage, for discharging air from the water conduit after the main vent passage has been sealed with cleaning water. As a result, the amount of air remaining in the water conduit after the main vent passage has been sealed with cleaning water can be adjusted by the auxiliary vent passage. This prevents an excessive amount of air from remaining in the water conduit, which would reduce the instantaneous flow rate of cleaning water discharged from the outlet. Therefore, cleaning water can be discharged stably from the outlet, and waste can be reliably discharged.

[0008] In the present invention, preferably, the auxiliary ventilation channel is in communication with the atmosphere.

[0009] According to the present invention configured in this manner, since the auxiliary ventilation passage is in communication with the atmosphere, even if the main ventilation passage is sealed with cleaning water quickly, the air remaining in the water conduit can be effectively discharged from the auxiliary ventilation passage.

[0010] Furthermore, in the present invention, preferably, a water guide member is provided that extends from the drain port of the cleaning water tank into the water guide channel and has a discharge opening formed therein for discharging cleaning water toward the water guide channel, a main ventilation channel is provided inside the water guide member and an auxiliary ventilation channel is provided outside the water guide member, and the air inlet of the auxiliary ventilation channel is positioned above the discharge opening of the water guide member.

[0011] According to the present invention configured as described above, a water guide member is provided that extends from the drain port of the cleaning water tank into the water guide channel and has a discharge opening formed therein for discharging cleaning water towards the water guide channel. A main ventilation passage is provided inside the water guide member, and an auxiliary ventilation passage is provided outside the water guide member. The air inlet of the auxiliary ventilation passage is positioned above the discharge opening of the water guide member. Therefore, by sealing the discharge opening of the water guide member with cleaning water, air can be retained in the water guide channel. Furthermore, after the discharge opening of the water guide member is sealed with cleaning water, the amount of air retained in the water guide channel can be adjusted from the auxiliary ventilation passage.

[0012] In the present invention, preferably, the main ventilation passage and the auxiliary ventilation passage are composed of water guiding members.

[0013] According to the present invention configured in this manner, the main ventilation passage and the auxiliary ventilation passage are composed of water-conducting members, so the main ventilation passage and the auxiliary ventilation passage can be constructed using water-conducting members without adding any new members.

[0014] Furthermore, in this invention, the air inlet of the auxiliary ventilation passage is located in a region other than the direction in which the cleaning water is discharged from the water discharge opening.

[0015] According to the present invention configured in this manner, the air inlet of the auxiliary ventilation passage is located in a region other than the direction in which the cleaning water is discharged from the water discharge opening. Therefore, it is possible to suppress obstruction of the flow of cleaning water discharged from the water discharge opening by the auxiliary ventilation passage.

[0016] In this invention, the air inlet of the auxiliary ventilation passage opens downward.

[0017] According to the present invention configured as described above, since the air inlet of the auxiliary ventilation passage opens downward, the amount of air retained in the water conduit can be freely adjusted by changing the size of the air inlet of the auxiliary ventilation passage.

[0018] Further, in the present invention, a sealing member for watertightly sealing between the drain valve device and the toilet body is provided, and the auxiliary ventilation passage is arranged inside the sealing member in a plan view.

[0019] According to the present invention configured as described above, the sealing member for watertightly sealing between the drain valve device and the toilet body is provided, and the auxiliary ventilation passage is arranged inside the sealing member in a plan view, so that flushing water can be prevented from leaking from the auxiliary ventilation passage.

[0020] In the present invention, an overflow pipe for draining flushing water overflowing from the flushing water tank to the toilet body is provided, and the auxiliary ventilation passage communicates with the overflow pipe.

[0021] According to the present invention configured as described above, the overflow pipe for draining flushing water overflowing from the flushing water tank to the toilet body is provided, and the auxiliary ventilation passage communicates with the overflow pipe, so that the air flowing into the auxiliary ventilation passage can be discharged using the overflow pipe without adding new members. Effects of the Invention

[0022] According to the flush toilet of the present invention, the present invention can stably discharge flushing water from the water discharge port to reliably discharge waste. Brief Description of the Drawings

[0023] [Figure 1] It is a plan view of the flush toilet according to the embodiment of the present invention. [Figure 2] It is a cross-sectional view taken along line II-II in Fig. 1. [Figure 3]This is an exploded perspective view of a flush water tank for a flush toilet according to an embodiment of the present invention. [Figure 4] This is a perspective view of the flush water tank for a flush toilet according to an embodiment of the present invention, viewed from above on the front side. [Figure 5] This is a partially enlarged view enlarging the vicinity of the water guide member of the flush toilet according to the embodiment of the present invention shown in Fig. 2. [Figure 6] This is a cross-sectional view taken along the line VI-VI in Fig. 5. [Figure 7] This is a cross-sectional view taken along the line VII-VII in Fig. 5. [Figure 8A] This is a cross-sectional view taken along the line VIIIA-VIIIA in Fig. 5. [Figure 8B] This is a cross-sectional view taken along the line VIIIB-VIIIB in Fig. 5. [Figure 8C] This is a cross-sectional view taken along the line VIIIC-VIIIC in Fig. 5. [Figure 8D] This is a cross-sectional view taken along the line VIIID-VIIID in Fig. 5. [Figure 9] This is a cross-sectional perspective view of the auxiliary ventilation passage of the flush toilet according to the embodiment of the present invention, viewed from the lower right side. [Figure 10A] This is a schematic diagram showing the flow of flush water at the initial stage of flushing of the flush toilet according to the embodiment of the present invention. [Figure 10B] This is a schematic diagram showing the flow of flush water at the middle stage of flushing of the flush toilet according to the embodiment of the present invention. [Figure 10C] This is a schematic diagram showing the flow of flush water at the final stage of flushing of the flush toilet according to the embodiment of the present invention. [Modes for Carrying Out the Invention]

[0024] Hereinafter, the flush toilet according to the embodiment of the present invention will be described with reference to the drawings. First, the basic structure of the flush toilet 1 according to the embodiment of the present invention will be described with reference to Fig. 1 to Fig. 4. Figure 1 is a plan view of a flush toilet according to an embodiment of the present invention, Figure 2 is a cross-sectional view along line II-II in Figure 1, Figure 3 is an exploded perspective view of a flush toilet according to an embodiment of the present invention, and Figure 4 is a perspective view of the flush water tank of a flush toilet according to an embodiment of the present invention, viewed from the front and above. In Figures 1 and 2, the rim water channel and the jet water channel are indicated by dashed lines, respectively. In this specification, when viewing a flush toilet from the front, the front side is referred to as the front, the back side as the rear, the right side as the right, and the left side as the left. When viewing a flush toilet from above, the center side of the toilet is referred to as the inside, and the outer casing side of the toilet is referred to as the outside.

[0025] As shown in Figures 1 and 2, the flush toilet 1 according to the embodiment of the present invention is a siphon jet type flush toilet that discharges waste by generating a siphon action through a jet of water.

[0026] As shown in Figure 1, the flush toilet 1 comprises a toilet bowl body 2 and a flush water tank 4 located at the rear upper part of the toilet bowl body 2. The toilet bowl body 2 and the flush water tank 4 are integrally formed from ceramic. The flush water tank 4 is provided with a lever handle (not shown), and the toilet is flushed when the user operates the lever handle.

[0027] The toilet bowl body 2 comprises a bowl portion 6 for receiving waste, a drain trap pipe 8 provided at the bottom of the bowl portion 6 for discharging waste by siphon action, a rim spout 10 for rim water discharge, a rim water channel 12 for supplying flushing water to the rim spout 10, a jet spout 14 for jet water discharge, and a jet water channel 16 for supplying flushing water to the jet spout 14. The rim water channel 12 and the jet water channel 16 are provided independently of each other. In the flush toilet bowl 1 according to the embodiment of the present invention, the rim water channel 12 and the jet water channel 16 are provided independently of each other, but they may be configured with a single common water channel.

[0028] The bowl portion 6 comprises a bowl-shaped waste receiving surface 18, a rim portion 20 formed along the upper edge of the bowl portion 6 and having an inner circumferential surface 20a that overhangs toward the interior of the bowl portion 6, a shelf surface 22 formed between the waste receiving surface 18 and the rim portion 20, and a pot portion 24 formed below the waste receiving surface 18, in which accumulated water W is formed. The water level of the accumulated water W is at the initial water level WL0 in the standby state before the start of washing.

[0029] The drain trap pipe 8 comprises an inlet 8a, an upward pipe 8b extending upward from the inlet 8a, a downward pipe 8c extending downward from the upward pipe 8b, and a top 8d located between the downward pipe 8c and the upward pipe 8b that defines the initial water level WL0 of the accumulated water W. The lower end of the downward pipe 8c of the drain trap pipe 8 is connected to a drain pipe (not shown) on the building side via a drain socket (not shown).

[0030] The rim spout 10 is formed in the rim portion 20, positioned on the right side of the bowl portion 6 and near the center in the front-to-back direction, and is formed to open forward. The flushing water discharged from the rim spout 10 swirls clockwise on the shelf surface 22 along the inner circumferential surface 20a of the rim portion 20. In this way, the flushing water swirls on the shelf surface 22, causing the flushing water to flow down from the shelf surface 22 to the waste receiving surface 18, thereby cleaning the waste receiving surface 18. In the flush toilet 1 according to the embodiment of the present invention, only one rim spout 10 is provided, but two or more rim spouts may be provided.

[0031] The rim water channel 12 has its upstream end connected to a rim drain port 4b formed in the bottom surface 4a of the flushing water tank 4, and its downstream end connected to the rim discharge port 10. In a plan view, the rim water channel 12 extends almost in a straight line forward from the rim drain port 4b of the flushing water tank 4 (see Figure 1). Flushing water is supplied to the rim water channel 12 from the flushing water tank 4, and the flushing water is discharged from the rim discharge port 10 by the head pressure of the flushing water stored in the flushing water tank 4. In the flush toilet 1 according to the embodiment of the present invention, flushing water is supplied to the rim water channel 12 from the flushing water tank 4, but the rim water channel 12 may be directly connected to a water source such as a water supply, and flushing water from a water supply source such as a water supply may be directly supplied to the rim water channel 12.

[0032] The jet outlet 14 is formed at the bottom of the bowl section 6. The jet outlet 14 is positioned opposite the inlet 8a of the drain trap pipe 8 and directed toward the inlet 8a of the drain trap pipe 8. The cleaning water is discharged from the jet outlet 14 toward the inlet 8a of the drain trap pipe 8, thereby promptly inducing a siphon effect.

[0033] The jet conduit 16 has its upstream end connected to a jet drain port 4c formed in the bottom surface 4a of the cleaning water tank 4, and its downstream end connected to a jet outlet 14. The jet conduit 16 includes a main channel 16a that extends straight forward from the jet drain port 4c of the cleaning water tank 4, a left-side bend channel 16b that branches off from the downstream end of the main channel 16a and extends forward after bending to the left, a right-side bend channel 16c that branches off from the downstream end of the main channel 16a and extends forward after bending to the right, and an outlet channel 16d where the downstream ends of the left-side bend channel 16b and the right-side bend channel 16c merge and extend straight backward to connect to the jet outlet 14 (see Figure 1). Cleaning water is supplied to the jet conduit 16 from the cleaning water tank 4, and the cleaning water is discharged from the jet outlet 14 by the head pressure of the cleaning water stored in the cleaning water tank 4. In the flush toilet 1 according to the embodiment of the present invention, flushing water from the flushing water tank 4 is supplied to the jet water channel 16. However, the jet water channel 16 may be directly connected to a water source such as a water supply, and flushing water from the water source such as a water supply may be directly supplied to the jet water channel 16.

[0034] The flushing water tank 4 is a tank that stores flushing water supplied from a water source (not shown), such as a water tap. The flushing water tank 4 is a gravity-fed tank that uses gravity to supply the stored flushing water to the toilet bowl body 2. The flushing water tank 4 comprises a ceramic outer tank 26 and a resin inner tank 28 placed inside the outer tank 26. The bottom surface 26a of the outer tank 26 is provided with a jet drain port 26b and a rim drain port 26c. The bottom surface 28a of the inner tank 28 is also provided with a jet drain port 28b. Furthermore, the inner tank 28 is equipped with fixing screws and fixing brackets (not shown) on its bottom surface 28a, and the inner tank 28 is fixed to the toilet bowl body 2 by being sandwiched between the bottom surface 26a of the outer tank 26 and the bottom surface 28a of the inner tank 28 and the fixing brackets. In the flush toilet 1 according to the embodiment of the present invention, the flush water tank 4 includes an outer tank 26 and an inner tank 28, but it may also include only the outer tank 26 without the inner tank 28, or it may include only the inner tank 28 without the outer tank 26.

[0035] The flushing water stored in the outer tank 26 (and outside the inner tank 28) flows into the rim water channel 12 through the rim drain port 26c of the outer tank 26. The flushing water stored in the inner tank 28 flows into the jet water channel 16 through the jet drain port 28b of the inner tank 28 and the jet drain port 26b of the outer tank 26. In the embodiment of the present invention, the flush toilet 1 has separate rim drain ports 4b and jet drain ports 4c, but the rim drain port 4b and jet drain port 4c may be configured as a single drain port.

[0036] An outer wall portion 30 is formed on the bottom surface 28a of the inner tank 28, extending vertically upward from the outer circumference of the jet drain port 28b. The water guide member 34 is made of resin material and is integrally formed with the inner tank 28 (see Figure 3). The outer wall portion 30 is integrally formed with the inner tank 28. The outer wall portion 30 is formed in a cylindrical shape and is arranged to surround the jet drain port 28b. An overflow pipe 32 is integrally formed on the right front outer wall portion 30. The overflow pipe 32 extends horizontally from the outer wall portion 30, then bends at a right angle and extends vertically upward. The upper end of the overflow pipe 32 is open to the atmosphere inside the flushing water tank 4 and is configured to drain the overflowing flushing water from the flushing water tank 4 into the toilet bowl body 2. In addition, an overflow cap 31 is attached to the upper end of the overflow pipe 32 to prevent foreign objects from flowing into the overflow pipe 32.

[0037] The bottom surface 28a of the inner tank 28 is provided with a water guide member 34 that extends vertically downward from the jet drain port 28b. When the inner tank 28 is attached to the outer tank 26, the water guide member 34 is positioned within the jet water channel 16. Furthermore, a drainage channel is configured within the water guide member 34 to guide the flushing water that flows into the water guide member 34 to the jet water channel 16 (see Figure 5). In the flush toilet 1 of this embodiment of the present invention, the water guide member 34 is integrated with the inner tank 28, but the water guide member 34 may be a separate component from the inner tank 28.

[0038] A sealing member 35 is provided between the drain valve device 33 and the toilet bowl body 2 to create a watertight seal between them. Specifically, the sealing member 35 is provided on the outer circumferential surface of the jet drain port 28b of the inner tank 28, creating a watertight seal between the inner tank 28 and the toilet bowl body 2. The sealing member 35 is a ring-shaped rubber packing. In this embodiment of the present invention, the sealing member 35 is provided on the outer circumferential surface of the jet drain port 28b of the inner tank 28, but it may also be provided on the drain valve device 33 or on the water guide member 34.

[0039] A jet drain valve device 33 is provided at the jet drain port 28b of the inner tank 28. The jet drain valve device 33 comprises a drain channel member 36 that forms a drain channel, a valve body (not shown) that opens and closes the drain port 36a of the drain channel member 36, and a drive mechanism (not shown) that drives the valve body by the operation of a lever handle by the user.

[0040] The drainage channel member 36 is made of a resin material and includes an inner wall portion 36b that forms a drainage channel, a valve seat 36c that protrudes upward from the upper surface of the inner wall portion 36b and on which a valve body sits or detaches, and a communication port 36d for allowing cleaning water from the inner tank 28 to flow into the drainage channel of the inner wall portion 36b. The inner wall portion 36b of the drainage channel member 36 is formed in a cylindrical shape and extends vertically downward through the jet drain port 28b and the water guide member 34.

[0041] The valve body of the jet drain valve device 33 is configured to move vertically up and down to open and close the drain port 36a of the drain channel member 36. The drive mechanism is, for example, a hydraulic drive mechanism driven by the water pressure of the cleaning water supplied from the water source. The drive mechanism is configured such that when the user operates the lever handle, the water pressure of the cleaning water is applied, raising the valve body of the jet drain valve device 33, and after a predetermined time has elapsed, the water pressure of the cleaning water is no longer applied, causing the valve body of the jet drain valve device 33 to lower.

[0042] A rim drain valve device (not shown) is provided at the rim drain port 26c of the outer tank 26. The rim drain valve device is positioned above the rim drain port 26c and is configured to open and close the rim drain port 4b by moving its valve body vertically up and down in response to the user's operation of a lever handle.

[0043] A water supply valve device (not shown) for supplying cleaning water is provided inside the outer tank 26 (and outside the inner tank 28). The water supply valve device is configured to switch the supply of cleaning water to the outer tank 26 and the inner tank 28 on and off. The water supply valve device is equipped with a float (not shown) that opens and closes a valve body in conjunction with the water level in the outer tank 26. The valve body is opened when the water level in the outer tank 26 falls below the full water level, and the valve body is closed when the water level in the outer tank 26 reaches the full water level.

[0044] Next, with reference to Figure 5, the water supply member 34 of the flush toilet 1 according to an embodiment of the present invention will be described in detail. Figure 5 is a magnified partial view of the area around the water guide member of a flush toilet according to the embodiment of the present invention shown in Figure 2.

[0045] As shown in Figure 5, the water guide member 34 is a component that guides the cleaning water discharged from the jet drain port 4c of the cleaning water tank 4 to the jet water channel 16, and also retains air within the jet water channel 16. The water guide member 34 is made of a resin material and extends from the jet drain port 4c of the cleaning water tank 4 into the jet water channel 16. This prevents the cleaning water discharged from the jet drain port 4c of the cleaning water tank 4 from colliding with the bottom surface 16e of the jet water channel 16 and generating turbulence, allowing the cleaning water to flow in a straightened manner.

[0046] The water guiding member 34 includes, from the upstream side, a hanging wall portion 34a extending vertically downward from the jet drain port 28b of the inner tank 28, a water discharge opening 34b formed in the front hanging wall portion 34a, and a receiving surface portion 34c that bends and extends forward from the lower end of the rear hanging wall portion 34a. Furthermore, the rear receiving surface portion 34c is provided with an inclined surface portion 34d, which is set to have a larger angle of inclination downward with respect to the horizontal direction compared to the front receiving surface portion 34c.

[0047] The hanging wall portion 34a of the water guiding member 34 is formed in a cylindrical shape and penetrates through the jet drain port 26b of the outer tank 26, and is inserted into the jet water channel 16. The lower end of the hanging wall portion 34a is located below the upper surface portion 16f of the jet water channel 16.

[0048] The discharge opening 34b of the water guide member 34 opens laterally toward the front. Furthermore, the discharge opening 34b is formed to open in the direction of the flow of cleaning water within the jet water guide channel 16. In addition, in a front view, the discharge opening 34b is formed in a generally rectangular shape that is elongated laterally and flattened (see Figure 4). The opening cross-sectional area of ​​the discharge opening 34b is set to be smaller than the opening cross-sectional area of ​​the drain port 36a of the drainage channel member 36. Also, the cross-sectional area of ​​the flow path cross-section within the water guide member 34 (the cross-section perpendicular to the flow direction of cleaning water) is set to gradually decrease toward the downstream side. The upper end of the discharge opening 34b is located below the upper surface portion 16f of the jet water guide channel 16, and the lower end of the discharge opening 34b is located above the bottom surface portion 16e of the jet water guide channel 16. The cleaning water flowing into the water guide member 34 is discharged from the discharge opening 34b into the jet water guide channel 16.

[0049] The receiving surface 34c of the water guide member 34 is inclined downward toward the front at a gentle angle and extends in a generally straight line. The receiving surface 34c is also positioned over the entire area obtained by projecting the drain port 36a of the drain channel member 36 vertically downward. In other words, the receiving surface 34c of the water guide member 34 is configured to receive all of the cleaning water discharged from the drain port 36a of the drain channel member 36. The receiving surface 34c is positioned to form a gap with respect to the bottom surface 16e of the jet water guide channel 16 and is positioned so as not to come into contact with the bottom surface 16e of the jet water guide channel 16. The receiving surface 34c is formed to be approximately parallel to the bottom surface 16e of the jet water guide channel 16. Furthermore, in a side cross-sectional view, the receiving surface 34c is inclined along the bottom surface 16e of the jet water guide channel 16 (see Figure 5). Furthermore, in a front cross-sectional view, the receiving surface portion 34c is formed along the bottom surface portion 16e of the jet water conduit 16, and is formed in a V-shape such that the left and right ends are higher and the center is the lowest (see Figure 6). The front end of the receiving surface portion 34c is positioned behind and above the upper end of the drain trap pipe 8.

[0050] The inclined surface portion 34d of the water guiding member 34 is inclined downward toward the front at a steep angle and extends in a generally straight line. The inclined surface portion 34d of the water guiding member 34 is located behind the center of the receiving surface portion 34c in the front-rear direction. The inclined surface portion 34d is located within the area obtained by projecting the drain port 36a of the drainage channel member 36 vertically downward. The angle of inclination of the inclined surface portion 34d toward the horizontal is set to be greater than that of the receiving surface portion 34c on the front side.

[0051] In a plan view, the water guide member 34 is positioned inside the opening edge of the jet drain port 26b of the outer tank 26. That is, when the inner tank 28 is attached to the outer tank 26, the water guide member 34, which is integrally formed with the inner tank 28, passes through the jet drain port 26b of the outer tank 26 (see Figure 3).

[0052] Next, with reference to Figures 5, 6, and 8A to 8D, the main ventilation passage 40 of the flush toilet 1 according to an embodiment of the present invention will be described in detail. Figure 6 is a cross-sectional view along the line VI-VI in Figure 5, and Figures 8A to 8D are cross-sectional views along the lines VIIIA-VIIIA to VIIID-VIIID in Figure 5. In Figure 6, the airflow is indicated by arrows.

[0053] As shown in Figures 5 and 6, a main vent passage 40 is provided inside the water guide member 34, through which air flows in communication with the atmosphere inside the cleaning water tank 4. The main vent passage 40 is configured to discharge the air inside the water guide member 34 to the outside of the jet water guide passage 16. The main vent passage 40 extends from the air inlet 40a of the main vent passage 40 to the opening 31a of the overflow cap 31. Air from the jet water guide passage 16 that flows in from the discharge opening 34b flows into the main vent passage 40 from the air inlet 40a and is discharged to the outside of the jet water guide passage 16 from the opening 31a of the overflow cap 31.

[0054] Furthermore, the cleaning water that flows from the cleaning water tank 4 into the water guide member 34 is discharged from the discharge opening 34b. When the flow rate of cleaning water passing through the discharge opening 34b increases, the discharge opening 34b is sealed with cleaning water. When the discharge opening 34b is sealed with cleaning water, air cannot enter or exit through the discharge opening 34b, and the air that had been stagnating in the jet water guide 16 is trapped inside the jet water guide 16.

[0055] As shown in Figure 6, the main ventilation passage 40 comprises an upstream ventilation passage 40b and a downstream ventilation passage 40c. The upstream ventilation passage 40b is constructed by incorporating a drainage channel member 36 inside a water guide member 34. The fitting portion between the drainage channel member 36 and the water guide member 34 is positioned above the upper end of the water discharge opening 34b. Therefore, the water guide member 34 is formed so that there is no gap due to fitting below the upper end of the water discharge opening 34b. This prevents air from leaking through the gap and allows it to be defined as a sealing surface that seals the upper end of the water discharge opening 34b with cleaning water.

[0056] The upstream ventilation passage 40b is formed between the inner wall portion 36b of the drainage channel member 36, which forms the drainage channel A through which the cleaning water flows, and the hanging wall portion 34a of the water guide member 34. The upstream ventilation passage 40b extends vertically upward from the air inlet 40a, bends at a right angle, and connects to the overflow pipe 32. The downstream ventilation passage 40c is composed of the overflow pipe 32. In other words, the overflow pipe 32 also serves as the downstream ventilation passage 40c. The downstream ventilation passage 40c extends vertically upward and connects to the opening 31a of the overflow cap.

[0057] As shown in Figures 5 and 8A, the water discharge opening 34b and the air inlet 40a of the main ventilation passage 40 are located on the front side of the water guide member 34. The air inlet 40a of the main ventilation passage 40 is located near the water discharge opening 34b, above its upper end. The air inlet 40a of the main ventilation passage 40 opens downwards. Furthermore, in a bottom view, the air inlet 40a of the main ventilation passage 40 is formed in a semi-circular shape along the hanging wall portion 34a of the water guide member 34 (see Figure 8A). In addition, in a bottom view, the air inlet 40a of the main ventilation passage 40 is located in a region forward of the center in the front-to-back direction of the water guide member 34. Furthermore, in a bottom view, the width W1 of the water discharge opening 34b in the left-to-right direction is set to be greater than the width W2 of the air inlet 40a of the main ventilation passage 40 in the left-to-right direction (see Figure 8A). The opening cross-sectional area of ​​the air inlet 40a of the main ventilation passage 40 is set to be the largest among the flow path cross-sections of the ventilation passage 40. In addition, the opening cross-sectional area of ​​the water discharge opening 34b is set to be larger than the opening cross-sectional area of ​​the air inlet 40a.

[0058] As shown in Figures 5, 6, 8B, and 8C, the upstream ventilation passage 40b is provided on the front side of the water guide member 34. In a bottom view, the upstream ventilation passage 40b is formed in a semi-circular shape along the hanging wall portion 34a of the water guide member 34 (see Figures 8B and 8C). In a bottom view, the upstream ventilation passage 40b is located in a region forward of the center in the front-to-back direction of the water guide member 34. Furthermore, the upstream ventilation passage 40b is provided on the outer peripheral surface of the inner wall portion 36b of the drainage channel member 36, which forms the drainage channel A through which the cleaning water flowing in from the jet drain port 4c flows. In a side view, the upstream ventilation passage 40b extends vertically along the inner wall portion 36b of the drainage channel member 36 and the hanging wall portion 34a of the water guide member 34.

[0059] As shown in Figures 5, 6, and 8D, the upstream ventilation passage 40b is connected at its upper end to the overflow pipe 32 that constitutes the downstream ventilation passage 40c. The inlet 32a to the overflow pipe 32 is formed in a horizontally elongated, flattened shape. Air flowing through the upstream ventilation passage 40b flows into the downstream ventilation passage 40c from the inlet 32a of the overflow pipe 32. Air flowing through the downstream ventilation passage 40c is discharged from the opening 31a of the overflow cap 31.

[0060] Next, with reference to Figures 5, 7, 8A to 8D, and 9, the auxiliary ventilation passage 42 of the flush toilet 1 according to an embodiment of the present invention will be described in detail. Figure 7 is a cross-sectional view along the line VII-VII in Figure 5, and Figure 9 is a cross-sectional perspective view of the auxiliary ventilation passage of a flush toilet according to an embodiment of the present invention, viewed from the lower right. In Figure 7, the airflow is indicated by arrows.

[0061] As shown in Figure 7, an auxiliary ventilation passage 42 is provided outside the water guide member 34, through which air flows in communication with the atmosphere inside the cleaning water tank 4. The auxiliary ventilation passage 42 is configured to discharge air from the jet water guide 16 after the water discharge opening 34b of the water guide member 34 and the air inlet 40a of the main ventilation passage 40 are sealed with cleaning water. The air in the jet water guide 16 around the water guide member 34 flows into the auxiliary ventilation passage 42 from the air inlet 42a and is discharged outside the jet water guide 16 from the opening 31a of the overflow cap 31.

[0062] As shown in Figure 7, the auxiliary ventilation passage 42 is constructed by incorporating the drainage channel member 36 inside the water guide member 34. The auxiliary ventilation passage 42 is formed between the inner wall portion 36b of the drainage channel member 36 and the hanging wall portion 34a of the water guide member 34. The auxiliary ventilation passage 42 extends vertically upward from the air inlet 40a and connects to the main ventilation passage 40. That is, the auxiliary ventilation passage 42 communicates with the overflow pipe 32 via the main ventilation passage 40. In plan view, the auxiliary ventilation passage 42 is located inside the seal member 35.

[0063] As shown in Figures 7 and 9, the air inlet 42a of the auxiliary ventilation passage 42 is formed on the outside of the hanging wall portion 34a of the water guide member 34. The air inlet 42a of the auxiliary ventilation passage 42 is positioned above the upper end of the discharge opening 34b of the water guide member 34. That is, the air inlet 42a of the auxiliary ventilation passage 42 is positioned above the sealing surface of the cleaning water defined by the upper end of the discharge opening 34b of the water guide member 31. Furthermore, the air inlet 42a of the auxiliary ventilation passage 42 is positioned below the upper surface portion 16f of the jet water guide 16. In addition, the air inlet 42a of the auxiliary ventilation passage 42 is positioned approximately midway between the upper end of the discharge opening 34b of the water guide member 34 and the upper surface portion 16f of the jet water guide 16 in the vertical direction. Moreover, the air inlet 42a of the auxiliary ventilation passage 42 is positioned below the air inlet 40a of the main ventilation passage 40.

[0064] Furthermore, the air inlet 42a of the auxiliary ventilation passage 42 is located in a region other than the direction in which the cleaning water is discharged from the water discharge opening 34b (the direction in which the water discharge opening 34b points). Specifically, the air inlet 42a of the auxiliary ventilation passage 42 is located on the rear side to the right rear of the water discharge opening 34b (see Figure 8A). In addition, the hanging wall portion 34a of the water guide member 34 is provided with a recess 34 formed to be recessed toward the interior of the water guide member 34, and the air inlet 42a of the auxiliary ventilation passage 42 is located within this recess 34 (see Figure 9). This prevents the flow of cleaning water discharged from the water discharge opening 34b from being obstructed by the auxiliary ventilation passage 42.

[0065] The air inlet 42a of the auxiliary ventilation passage 42 opens downwards. The opening cross-sectional area of ​​the air inlet 42a of the auxiliary ventilation passage 42 is set to be smaller than the opening cross-sectional area of ​​the air inlet 40a of the main ventilation passage 40. The air inlet 42a of the auxiliary ventilation passage 42 is formed in a perfect circle shape. The amount of air that remains in the jet water conduit 16 is regulated by the size and height of the air inlet 42a of the auxiliary ventilation passage 42. Specifically, if the size of the auxiliary ventilation passage 42 increases, the amount of air that remains in the jet water conduit 16 decreases, and if it decreases, it increases. Also, if the height of the auxiliary ventilation passage 42 increases, the amount of air that remains in the jet water conduit 16 decreases, and if it decreases, it increases. In this way, the size and height of the air inlet 42a of the auxiliary ventilation passage 42 can be freely adjusted so that an appropriate amount of air accumulates in the jet water conduit 16.

[0066] Next, the flushing operation of the flush toilet 1 according to an embodiment of the present invention will be described with reference to Figures 2, 10A to 10C. Figure 10A is a schematic diagram showing the flow of flushing water during the initial stage of flushing a toilet according to an embodiment of the present invention, Figure 10B is a schematic diagram showing the flow of flushing water during the middle stage of flushing a toilet according to an embodiment of the present invention, and Figure 10C is a schematic diagram showing the flow of flushing water during the final stage of flushing a toilet according to an embodiment of the present invention.

[0067] First, as shown in Figure 2, in the standby state before cleaning begins, the water W in the bowl section 24 and drain trap pipe 8 of the bowl section 6 has accumulated up to the initial water level WL0. Also, cleaning water has accumulated up to the initial water level WL0 in the jet water channel 16. Air has accumulated above the water W in the main channel 16a of the jet water channel 16.

[0068] Next, when the user operates the lever handle, the rim drain valve device (not shown) opens, and the cleaning water inside the outer tank 26 (and outside the inner tank 28) is discharged from the rim discharge port 10. After that, the jet drain valve device 33 opens, and the cleaning water inside the inner tank 28 is discharged from the jet discharge port 14.

[0069] As shown in Figure 10A, when the cleaning water in the inner tank 28 is discharged from the drain port 36a of the drain channel member 36, it passes through the drain channel A formed in the inner wall portion 36b of the drain channel member 36 and flows into the water guide member 34. At this time, some of the air that was stagnant in the jet water guide channel 16 flows into the water guide member 34 from the discharge opening 34b of the water guide member 34 and into the main ventilation channel 40 from the air inlet 40a of the main ventilation channel 40 (see f1 in Figure 10A). The air that has flowed into the main ventilation channel 40 rises up the overflow pipe 32 and is discharged from the opening 31a of the overflow cap 31 (see f2 in Figure 10A). As a result, the amount of air stagnant in the jet water guide channel 16 is reduced, and the obstruction of the flow of cleaning water by the stagnant air can be suppressed.

[0070] Furthermore, the cleaning water that flows into the water guide member 34 flows along the inclined surface portion 34d and the receiving surface portion 34c of the water guide member 34, and is discharged into the jet water guide channel 16 from the discharge opening 34b.

[0071] As shown in Figure 10B, after a predetermined time has elapsed, the flow rate of cleaning water passing through the discharge opening 34b increases, and the discharge opening 34b is sealed with cleaning water. In other words, air is unable to enter or exit through the discharge opening 34b. As a result, the air that was stagnant in the main channel 16a of the jet water conduit 16 is trapped within the jet water conduit 16 and remains in the air stagnation space S (the dashed line portion in Figure 10B) located above the main channel 16a of the jet water conduit 16. This separates the cleaning water and air within the main channel 16a of the jet water conduit 16, preventing the flow of cleaning water from being obstructed by the stagnant air as the cleaning water flows through the jet water conduit, and also preventing air from being discharged from the jet discharge port 14 together with the cleaning water. When cleaning water is discharged from the jet discharge port 14 toward the inlet 8a of the drain trap pipe 8, the drain trap pipe 8 becomes full, a siphon effect occurs, and waste is discharged.

[0072] Furthermore, if the discharge opening 34b of the water guide member 34 is sealed with cleaning water extremely quickly, an excessive amount of air may accumulate in the air retention space S. An excess of air is undesirable because it creates flow resistance when the cleaning water flows through the jet water guide. Since the air inlet 42a of the auxiliary ventilation passage 42 is positioned above the sealing surface at the upper end of the discharge opening 34b, the excess air can be discharged after the discharge opening 34b has been sealed with cleaning water. Specifically, the air accumulated in the air retention space S flows into the ventilation passage 42 from the air inlet 42a of the auxiliary ventilation passage 42, passes through the main ventilation passage 40, rises up the overflow pipe 32, and is discharged from the opening 31a of the overflow cap 31 (see f3 in Figure 10B). In this way, the amount of air accumulated in the air retention space S is adjusted to an appropriate level so as not to create flow resistance, thereby preventing the flow of cleaning water from being obstructed by the accumulated air.

[0073] As shown in Figure 10C, when the accumulated water W drops to the lowest water level WL1 and the siphon action ends, the jet drain valve device 33 closes and the jet discharge stops. Subsequently, flushing water continues to be discharged from the rim outlet 10, and the accumulated water W rises to the initial water level WL0. After that, the rim drain valve device closes, water is supplied from the water supply valve device to the flushing water tank 4, and the toilet flushing is completed.

[0074] The effects and benefits of the embodiments of the present invention described above will be explained below. First, according to the flush toilet 1 of the embodiment of the present invention, a main ventilation passage 40 is provided within the jet water channel 16 for discharging air from the jet water channel 16 to the outside of the jet water channel 16, and an auxiliary ventilation passage 42 is provided, which has an air inlet 42a with a smaller opening cross-sectional area than the air inlet 40a of the main ventilation passage 40 for discharging air from the jet water channel 16 after the main ventilation passage is sealed with flushing water. As a result, the amount of air remaining in the jet water channel 16 after the main ventilation passage 40 is sealed with flushing water can be adjusted by the auxiliary ventilation passage 42. This prevents an excessive amount of air from remaining in the jet water channel 16, which would reduce the instantaneous flow rate of flushing water discharged from the jet outlet 14. Therefore, flushing water can be discharged stably from the jet outlet 14, and waste can be reliably discharged.

[0075] Furthermore, according to the flush toilet 1 embodiment of the present invention, since the auxiliary ventilation passage 42 is in communication with the atmosphere, even if the main ventilation passage 40 is sealed with flushing water quickly, the air remaining in the jet water channel 16 can be effectively discharged from the auxiliary ventilation passage 42.

[0076] According to the flush toilet 1 of the embodiment of the present invention, a water guide member 34 is provided that extends from the drain port of the flush water tank 4 into the jet water guide channel 16 and has a discharge opening 34b formed therein that discharges flush water toward the jet water guide channel 16. A main ventilation passage 40 is provided inside the water guide member 34, and an auxiliary ventilation passage 42 is provided outside the water guide member 34. The air inlet 42a of the auxiliary ventilation passage 42 is positioned above the discharge opening 34b of the water guide member 34. Therefore, by sealing the discharge opening 34b of the water guide member 34 with flush water, air can be retained in the jet water guide channel 16. Furthermore, after the discharge opening 34b of the water guide member 34 is sealed with flush water, the amount of air retained in the jet water guide channel 16 can be adjusted from the auxiliary ventilation passage 42.

[0077] Furthermore, according to the flush toilet 1 embodiment of the present invention, the main ventilation passage 40 and the auxiliary ventilation passage 42 are composed of water guiding members 34, so the main ventilation passage 40 and the auxiliary ventilation passage 42 can be constructed using the water guiding members 34 without adding any new members.

[0078] According to the flush toilet 1 of the embodiment of the present invention, the air inlet 42a of the auxiliary ventilation passage 42 is located in a region other than the direction in which flushing water is discharged from the water discharge opening 34b, so that the flow of flushing water discharged from the water discharge opening 34b is not obstructed by the auxiliary ventilation passage 42.

[0079] Furthermore, according to the flush toilet 1 embodiment of the present invention, since the air inlet 42a of the auxiliary ventilation passage 42 is open downwards, the amount of air stagnating in the jet water channel 16 can be freely adjusted by changing the size of the air inlet 42a of the auxiliary ventilation passage 42.

[0080] According to the water-flushing toilet 1 of the embodiment of the present invention, a sealing member 35 is provided to watertightly seal the space between the drain valve device 33 and the toilet body 2, and the auxiliary ventilation passage 42 is located inside the sealing member 35 in a plan view, so that it is possible to prevent water from leaking from the auxiliary ventilation passage 42.

[0081] Furthermore, according to the flush toilet 1 of the embodiment of the present invention, an overflow pipe 32 is provided for draining the overflowing flush water in the flush water tank 4 into the toilet bowl body 2, and the auxiliary ventilation passage 42 is in communication with the overflow pipe 32, so that air flowing into the auxiliary ventilation passage 42 can be discharged using the overflow pipe 32 without adding any new components.

[0082] In the embodiment of the present invention, the flush toilet 1 is shown as an example in which the water guide member 34, the main ventilation passage 40, and the auxiliary ventilation passage 42 are provided in the jet water guide passage 16. However, the water guide member 34, the main ventilation passage 40, and the auxiliary ventilation passage 42 may also be provided in the rim water guide passage 12.

[0083] Although embodiments of the present invention have been described above, various modifications can be made to the embodiments described above. [Explanation of Symbols]

[0084] 1: Flush toilet 2: Toilet bowl 4: Washing water tank 4a: Bottom of the washing water tank 4b: Drain for rim 4c: Drain outlet for jet 6: Bowl section 8: Drain trap pipe 8a: Inlet of drain trap pipe 10: Rim spout 12: Rim water conduit 14: Jet nozzle 16: Jet water conduit 26: Outer Tank 26a: Bottom of the outer tank 26b: Outer tank jet drain port 26c: Drainage port for the rim of the outer tank 28: Inner Tank 28a: Bottom of the inner tank 28b: Drain port for jets in the inner tank 31: Overflow cap 31a: Opening of the overflow cap 32: Overflow pipe 33: Drain valve device for jets 34: Water guiding member 34a: Hanging wall portion of the water guiding member 34b: Discharge opening of water guide member 34c: Receiving surface of the water guiding member 34d: Inclined surface of the water guiding member 36: Drainage channel component 36a: Drain outlet of drainage channel member 36b: Inner wall portion of drainage channel member 36c: Valve seat of drainage channel component 36d: Communication opening for drainage channel member 40: Main ventilation channel 40a: Air inlet of the main ventilation channel 40b: Upstream ventilation channel of the main ventilation channel 40c: Downstream ventilation channel of the main ventilation channel 42: Auxiliary ventilation channel 42a: Air inlet for auxiliary ventilation channel A: Drainage channel for washing water S: Air stagnation space W:Retained water WL0: Initial water level of the reservoir WL1: Minimum water level of the reservoir

Claims

1. A flush toilet that uses flushing water to wash away waste, A toilet bowl body comprising a bowl section for receiving waste, a spout provided in the bowl section for discharging flushing water, a water channel for guiding the flushing water to the spout, and a drain trap pipe connected to the bottom of the bowl section for discharging waste, A flushing water tank is provided for storing the flushing water supplied to the toilet bowl, and a drain is provided for discharging the stored flushing water into the toilet bowl. A drain valve device that opens and closes the drain port of the above-mentioned cleaning water tank, It has, A main ventilation passage is provided within the above-mentioned water conduit for discharging air from within the water conduit to the outside of the water conduit, An air inlet with a smaller opening cross-sectional area than the air inlet of the main ventilation passage is formed, and an auxiliary ventilation passage is provided for discharging air from the water conduit after the main ventilation passage has been sealed with cleaning water. A flush toilet characterized by having the following features.

2. The above-mentioned auxiliary ventilation passage is in communication with the atmosphere, as described in claim 1.

3. The water guide member extends from the drain port of the above-mentioned cleaning water tank into the above-mentioned water guide channel and has a discharge opening formed therein for discharging cleaning water toward the above-mentioned water guide channel, The main ventilation passage is provided inside the water guiding member, and the auxiliary ventilation passage is provided outside the water guiding member. The flush toilet according to claim 1 or 2, wherein the air inlet of the auxiliary ventilation passage is positioned above the water discharge opening of the water guide member.

4. The flush toilet according to claim 3, wherein the main ventilation passage and the auxiliary ventilation passage are composed of the water guiding member.

5. The flush toilet according to claim 4, wherein the air inlet of the auxiliary ventilation passage is located in a region other than the direction in which flushing water is discharged from the water discharge opening.

6. The flush toilet according to claim 5, wherein the air inlet of the above-mentioned auxiliary ventilation passage is open downward.

7. The above drain valve device and the above toilet bowl body are provided with a sealing member for watertight sealing, The flush toilet according to claim 1 or 2, wherein the auxiliary ventilation passage is located inside the sealing member in a plan view.

8. The toilet is equipped with an overflow pipe for draining the overflowing flushing water from the flushing water tank into the toilet bowl body. The above-mentioned auxiliary ventilation passage is in communication with the above-mentioned overflow pipe, as described in claim 1.

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