Water-washable toilet

Abstract

The present invention aims to provide a flush toilet that can stably discharge flushing water from the outlet and reliably remove waste. [Solution] The present invention provides a toilet bowl 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 outlet, and a drain trap pipe 8 for discharging waste; a flushing water tank 4 having a jet drain outlet 4c formed therein for discharging the stored flushing water to the toilet bowl; and a jet drain valve device 33 for opening and closing the drain outlet 4c. The present invention also provides a water guide member 34 that extends from the jet drain outlet 4c into the jet water channel 16 and has a discharge opening 34b formed therein for discharging flushing water toward the jet water channel 16, the lower end of which is located below the upper surface portion 16f of the jet water channel 16.

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 includes 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 washing is started. When washing 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

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0004] However, in the flush toilet described in the above-mentioned Patent Document 1, when the flush water flows through the jet water conduit, the flow of the flush water is obstructed by the air remaining in the entire flow path inside the jet water conduit. As a result, the instantaneous flow rate of the flush water discharged from the jet spout decreases, which causes a problem that waste may not be sufficiently discharged.

[0005] Accordingly, an object of the present invention is to provide a flush toilet that can stably discharge flush water from a spout and reliably discharge waste.

MEANS FOR SOLVING THE PROBLEMS

[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 below the bowl portion for discharging waste; a flushing water tank for storing flushing water supplied to the toilet body and having a drain port 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 water guide member that extends from the drain port of the flushing water tank into the water channel and has a water outlet opening for discharging flushing water toward the water channel, and the lower end of the water guide member is located below the upper surface of the water channel.

[0007] According to the present invention configured in this manner, 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 into the water guide channel. Since the lower end of this water guide member is located below the upper surface of the water guide channel, air moves and accumulates above the water guide channel, and the cleaning water flowing below the water guide channel can be separated from the air accumulated above the water guide channel. As a result, it is possible to suppress the obstruction of the flow of cleaning water by the accumulated air as the cleaning water flows through the water guide channel. Consequently, cleaning water can be discharged stably from the discharge port, and waste can be reliably discharged.

[0008] In the present invention, preferably, a ventilation passage for discharging air from the water conduit to the outside of the water conduit is provided inside the water conduit member.

[0009] According to the present invention configured in this manner, a ventilation passage for discharging air from the water conduit to the outside of the water conduit is provided inside the water conduit member. This allows for the discharge of air from the water conduit member and prevents obstruction of the flow of cleaning water by air.

[0010] Furthermore, in the present invention, preferably, the air inlet of the ventilation passage is provided near the water discharge opening.

[0011] With the present invention configured in this way, since the air inlet of the ventilation passage is provided near the water discharge opening, air that has flowed into the water guide member from the water discharge opening can be efficiently flowed into the air inlet of the ventilation passage and discharged.

[0012] In the present invention, preferably, a drainage channel is formed inside the water guiding member through which the cleaning water flowing in from the drain port of the cleaning water tank flows, and the ventilation channel is provided outside the drainage channel.

[0013] According to the present invention configured in this manner, a drainage channel is formed inside the water guiding member through which the cleaning water flowing in from the drain port of the cleaning water tank flows, and the ventilation channel is provided outside the drainage channel. Therefore, a ventilation channel can be provided inside the water guiding member without obstructing the flow of cleaning water through the drainage channel inside the water guiding member.

[0014] Furthermore, the present invention includes an overflow pipe for draining excess flushing water from the flushing water tank into the toilet bowl, and the overflow pipe also serves as part of the ventilation passage.

[0015] According to the present invention configured in this way, an overflow pipe is provided for draining the overflowing flushing water from the flushing water tank into the toilet bowl body, and since the overflow pipe also serves as part of the ventilation passage, the ventilation passage can be constructed using the overflow pipe without adding any new components.

[0016] In this invention, the opening cross-sectional area of ​​the air inlet of the ventilation passage is set to be the largest among the flow path cross-sections of the ventilation passage.

[0017] According to the present invention configured in this way, the opening cross-sectional area of ​​the air inlet of the ventilation passage is set to be the largest among the flow path cross-sections of the ventilation passage, so that a large amount of air can be taken into the ventilation passage.

[0018] Further, in the present invention, a drainage flow path member incorporated inside the water guide member to form a drainage flow path through which flush water flowing in from a drain port of a flush water tank flows is provided, and a ventilation path is formed between the drainage flow path member and the water guide member.

[0019] According to the present invention configured as described above, the drainage flow path member incorporated inside the water guide member to form the drainage flow path through which the flush water flowing in from the drain port of the flush water tank flows is provided, and the ventilation path is formed between the drainage flow path member and the water guide member, so that the ventilation path can be provided inside the water guide member without hindering the flow of the flush water flowing through the drainage flow path in the water guide member.

[0020] In the present invention, the lateral width of the water discharge opening is set to be larger than the lateral width of the air inflow port of the ventilation path.

[0021] According to the present invention configured as described above, since the lateral width of the water discharge opening is set to be larger than the lateral width of the air inflow port of the ventilation path, the flush water can be stably discharged from the water discharge opening, and an appropriate amount of air can be stably retained above the water guide path.

[0022] Further, in the present invention, the fitting portion of the water guide member is disposed above the upper end of the water discharge opening.

[0023] According to the present invention configured as described above, since the fitting portion of the water guide member is disposed above the water discharge opening, air leakage from the gap can be prevented, and the upper end of the water discharge opening can be used as a sealing surface that is sealed with the flush water. Effects of the Invention

[0024] According to the flush toilet of the present invention, the present invention can stably discharge flush water from the water discharge port and reliably discharge waste. Brief Description of the Drawings

[0025] [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 Figure 1. [Figure 3] It is an exploded perspective view of a flush water tank for a flush toilet according to an embodiment of the present invention. [Figure 4] It is a perspective view of the flush water tank for a flush toilet according to an embodiment of the present invention, viewed from the upper front side. [Figure 5] It 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 Figure 2. [Figure 6] It is a cross-sectional view taken along line VI-VI in Figure 5. [Figure 7A] It is a cross-sectional view taken along line VIIA-VIIA in Figure 5. [Figure 7B] It is a cross-sectional view taken along line VIIB-VIIB in Figure 5. [Figure 7C] It is a cross-sectional view taken along line VIIC-VIIC in Figure 5. [Figure 7D] It is a cross-sectional view taken along line VIID-VIID in Figure 5. [Figure 8] It is a perspective view of the flush water tank for a flush toilet according to an embodiment of the present invention, viewed from the upper left side. [Figure 9A] It is a schematic diagram showing the flow of flush water at the initial stage of flushing of a flush toilet according to an embodiment of the present invention. [Figure 9B] It is a schematic diagram showing the flow of flush water at the middle stage of flushing of a flush toilet according to an embodiment of the present invention. [Figure 9C] It is a schematic diagram showing the flow of flush water at the final stage of flushing of a flush toilet according to an embodiment of the present invention. [Modes for Carrying Out the Invention]

[0026] Hereinafter, a flush toilet according to an 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 Figures 1 to 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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).

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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 supplied directly to the jet water channel 16.

[0036] 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 flushing 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.

[0037] 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.

[0038] 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 outer wall portion 30 is formed integrally 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.

[0039] 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. The water guide member 34 is made of a resin material and is integrally formed with the inner tank 28 (see Figure 3). When the inner tank 28 is attached to the outer tank 26, the water guide member 34 is positioned within the jet water guide 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 guide 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 unit from the inner tank 28.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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. Cleaning water flowing into the water guide member 34 is discharged from the discharge opening 34b into the jet water guide channel 16.

[0051] 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.

[0052] 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.

[0053] 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).

[0054] Next, with reference to Figures 5, 6, 7A to 7D, and 8, the 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, Figures 7A to 7D are cross-sectional views along the lines VIIA-VIIA to VIID-VIID in Figure 5, and Figure 8 is a perspective view of the flushing water tank of a flush toilet according to an embodiment of the present invention, viewed from the upper left. In Figure 6, the airflow is indicated by arrows.

[0055] As shown in Figures 5 and 6, a ventilation 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 ventilation passage 40 is configured to discharge the air inside the water guide member 34 to the outside of the jet water guide 16. The ventilation passage 40 extends from the air inlet 40a of the ventilation passage 40 to the opening 31a of the overflow cap 31. Air from the jet water guide 16 that flows in from the discharge opening 34b flows into the ventilation passage 40 from the air inlet 40a and is discharged to the outside of the jet water guide 16 from the opening 31a of the overflow cap 31.

[0056] 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.

[0057] As shown in Figure 6, the 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.

[0058] 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.

[0059] As shown in Figures 5 and 7A, the water discharge opening 34b and the air inlet 40a of the ventilation passage 40 are located on the front side of the water guide member 34. The air inlet 40a of the ventilation passage 40 is located near the water discharge opening 34b, above the upper end of the water discharge opening 34b. The air inlet 40a of the ventilation passage 40 opens downwards. Furthermore, in a bottom view, the air inlet 40a of the ventilation passage 40 is formed in a semi-circular shape along the hanging wall portion 34a of the water guide member 34 (see Figure 7A). Also, in a bottom view, the air inlet 40a of the 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 ventilation passage 40 in the left-to-right direction (see Figure 7A). The opening cross-sectional area of ​​the air inlet 40a of the 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.

[0060] As shown in Figures 5, 6, 7B, and 7C, 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 7B and 7C). 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.

[0061] As shown in Figures 5, 6, and 7D, the upstream ventilation passage 40b is connected at its upper end to the overflow pipe 32 that constitutes the downstream ventilation passage 40c. As shown in Figure 8, 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.

[0062] 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, 9A to 9C. Figure 9A 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 9B 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 9C 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.

[0063] 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.

[0064] 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.

[0065] As shown in Figure 9A, 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 ventilation channel 40 from the air inlet 40a of the ventilation channel 40 (see f1 in Figure 9A). The air that has flowed into the 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 9A). 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.

[0066] 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.

[0067] As shown in Figure 9B, 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 9B) 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.

[0068] As shown in Figure 9C, 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.

[0069] 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 water guide member 34 is provided that extends from the jet drain port 4c 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. The lower end of this water guide member 34 is located below the upper surface portion 16f of the jet water guide channel 16, so that air moves and accumulates above the jet water guide channel 16, and the flush water flowing below the jet water guide channel 16 and the air accumulated above the jet water guide channel 16 can be separated. As a result, when the flush water flows through the jet water guide channel 16, the obstruction of the flow of flush water by the accumulated air can be suppressed. As a result, flush water can be discharged stably from the jet discharge port 14 at an appropriate instantaneous flow rate and timing, and waste can be reliably discharged. Furthermore, by retaining the air that accumulates above the jet water channel 16, the jet water channel 16 can be filled with water more quickly, and the head pressure of the cleaning water stored in the cleaning water tank 4 can be applied more quickly. This makes it possible to suppress the loss of head pressure of the cleaning water stored in the cleaning water tank 4.

[0070] Furthermore, according to the flush toilet 1 of the embodiment of the present invention, a ventilation passage 40 for discharging air from the jet water channel 16 to the outside of the jet water channel 16 is provided inside the water guide member 34, so that air inside the water guide member 34 can be discharged and the obstruction of the flow of flushing water by air can be suppressed.

[0071] According to the flush toilet 1 embodiment of the present invention, the air inlet 40a of the ventilation passage 40 is provided near the water discharge opening 34b, so that air flowing into the water guide member 34 from the water discharge opening 34b can be efficiently flowed into the air inlet 40a of the ventilation passage 40 and discharged.

[0072] Furthermore, according to the flush toilet 1 embodiment of the present invention, a drainage channel A is formed inside the water guide member 34 through which flushing water flowing in from the jet drain port 4c of the flushing water tank 4 flows, and the ventilation channel 40 is provided outside the drainage channel A. Therefore, the ventilation channel 40 can be provided inside the water guide member 34 without obstructing the flow of flushing water through the drainage channel A inside the water guide member 34.

[0073] 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 from the flush water tank 4 into the toilet bowl body 2, and since the overflow pipe 32 also serves as part of the ventilation passage 40, the ventilation passage 40 can be constructed using the overflow pipe 32 without adding any new components.

[0074] Furthermore, according to the flush toilet 1 embodiment of the present invention, the opening cross-sectional area of ​​the air inlet 40a of the ventilation passage 40 is set to be the largest among the flow path cross-sections of the ventilation passage 40, so that a large amount of air can be taken into the ventilation passage 40.

[0075] According to the flush toilet 1 of the embodiment of the present invention, a drainage channel member 36 is incorporated inside the water guide member 34 and forms a drainage channel A through which flushing water flowing in from the jet drain port 4c of the flushing water tank 4 flows. Since a ventilation passage 40 is formed between the drainage channel member 36 and the water guide member 34, the ventilation passage 40 can be provided inside the water guide member 34 without obstructing the flow of flushing water through the drainage channel A inside the water guide member 34.

[0076] Furthermore, according to the flush toilet 1 embodiment of the present invention, the width W1 in the left-right direction of the water discharge opening 34b is set to be larger than the width W2 in the left-right direction of the air inlet 40a of the ventilation passage 40, so that flushing water can be discharged stably from the water discharge opening 34b and an appropriate amount of air can be stably retained above the jet water guide 16.

[0077] According to the flush toilet 1 embodiment of the present invention, the fitting portion of the water guide member 34 is positioned above the upper end of the water discharge opening 34b, thereby preventing air from leaking from the fitting portion and creating a sealing surface that seals the upper end of the water discharge opening 34b with flushing water.

[0078] In the embodiment of the present invention, the flush toilet 1 is shown as an example in which the water guide member 34 and the ventilation passage 40 are provided in the jet water guide passage 16, but the water guide member 34 and the ventilation passage 40 may also be provided in the rim water guide passage 12.

[0079] Although embodiments of the present invention have been described above, various modifications can be made to the embodiments described above. [Explanation of Symbols]

[0080] 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: Ventilation channel 40a: Air inlet of the ventilation channel 40b: Upstream ventilation channel of the ventilation channel 40c: Downstream ventilation channel of the ventilation channel A: Drainage channel for wash 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, 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, A flush toilet characterized in that the lower end of the water guiding member is located below the upper surface of the water guiding channel.

2. A flush toilet according to claim 1, wherein a ventilation passage is provided inside the water guiding member for discharging the air inside the water guiding channel to the outside of the water guiding channel.

3. The flush toilet according to claim 2, wherein the air inlet of the ventilation passage is provided near the water discharge opening.

4. The flush toilet according to claim 2, wherein a drainage channel is formed inside the water guiding member through which the flushing water flowing in from the drain port of the flushing water tank flows, and the ventilation channel is provided outside the drainage channel.

5. 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 flush toilet according to claim 3 or 4, wherein the overflow pipe also serves as part of the ventilation passage.

6. The flush toilet according to claim 5, wherein the opening cross-sectional area of ​​the air inlet of the ventilation passage is set to be the largest among the flow path cross-sections of the ventilation passage.

7. The above-mentioned water guiding member is incorporated inside the above-mentioned water guiding member and includes a drainage channel member that forms a drainage channel through which the cleaning water flowing in from the drain port of the above-mentioned cleaning water tank flows, The flush toilet according to claim 3 or 4, wherein the above-mentioned ventilation passage is formed between the above-mentioned drainage channel member and the above-mentioned water guiding member.

8. The flush toilet according to claim 3 or 4, wherein the width of the water discharge opening in the left-right direction is set to be greater than the width of the air inlet of the ventilation passage in the left-right direction.

9. The flush toilet according to claim 1, wherein the fitting portion of the water guiding member is positioned above the upper end of the water discharge opening.

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