Water-washable toilet

Abstract

The present invention aims to provide a flush toilet that can suppress abnormal noises when air is discharged from the water outlet, using a simple structure. [Solution] The present invention comprises a bowl portion 4 having a waste receiving surface 8 for receiving waste, a rim portion 10 formed above the waste receiving surface 8, and a pot portion 12 formed below the waste receiving surface 8 with a water reservoir WL formed inside; a drain trap pipe 6 connected below the bowl portion 4 for discharging waste; a jet outlet 16 provided in the bowl portion 4 for discharging cleaning water; and a jet water conduit 30, at least a portion of which is positioned above the water reservoir WL, for guiding cleaning water supplied from a water source to the outlet. An air retention portion S1 is formed in the jet water conduit 30 where air accumulates, and this air retention portion S1 is located at the downstream end 30a of the jet water conduit 30.

Description

Technical Field

[0001] The present invention relates to a flush toilet, and particularly to a flush toilet that cleans with flushing water to discharge filth.

Background Art

[0002] Conventionally, as described in Patent Document 1, there has been known a flush toilet comprising: a jet spout that discharges flushing water toward an inlet of a drainage trap conduit; and a jet water guide channel for guiding flushing water supplied from a water supply source to the jet spout. In such a flush toilet, before flushing is started, air is present in the jet water guide channel above the stored water surface. When flushing is started and flushing water is supplied into the jet water guide channel, the air in the jet water guide channel is pushed by the flushing water and discharged from the jet spout. At this time, since the compressed air is discharged from the jet spout, an abnormal gurgling noise is generated. In order to suppress this abnormal noise, in the flush toilet described in Patent Document 1, an expanded portion where the flow channel is enlarged is provided in the middle of the jet water guide channel. Accordingly, when flushing water flows into the jet water guide channel, air stays in the expanded portion and is not discharged from the jet spout, so that abnormal noise generated when air is discharged from the jet spout is suppressed.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] However, in the flush toilet described in Patent Document 1, the expansion section where air accumulates is provided in the middle of the jet water channel, which complicates the structure of the jet water channel. Specifically, when the expansion section is provided in the middle of the jet water channel, the expansion section must be made of a separate component from the jet water channel, which complicates the structure of the jet water channel. A more complex structure for the jet water channel increases the manufacturing cost of the jet water channel and makes it difficult to house the jet water channel inside the toilet bowl body.

[0005] Therefore, the present invention was made to solve the above-mentioned conventional problems, and aims to provide a flush toilet that can suppress abnormal noise when air is discharged from the water outlet with a simple structure. [Means for solving the problem]

[0006] To achieve the above-mentioned objectives, the present invention provides a flush toilet that washes and discharges waste with flushing water, comprising: a bowl portion having a waste receiving surface for receiving waste, a rim portion formed above the waste receiving surface, and a pot portion formed below the waste receiving surface with a water reservoir inside; a drain trap pipe connected below the bowl portion for discharging waste; a water outlet provided in the bowl portion for discharging flushing water; and a water conduit, at least a portion of which is positioned above the water reservoir, for guiding flushing water supplied from a water source to the water outlet, wherein an air reservoir is formed in the water conduit, and this air reservoir is located at the downstream end of the water conduit.

[0007] In the present invention configured in this way, an air retention section is formed in the water conduit, and since this air retention section is located at the downstream end of the water conduit, the water conduit can be constructed more simply compared to the conventional case where the air retention section is provided in the middle of the water conduit. As a result, abnormal noise when air is discharged from the water outlet can be suppressed with a simple structure.

[0008] In the present invention, preferably, the discharge port is formed on the downstream end face of the downstream end of the water conduit, and the discharge port is formed such that its opening area is smaller than the surface area of ​​the downstream end face. In the present invention configured as described above, the discharge port is formed on the downstream end surface of the downstream end of the water conduit, and the discharge port is formed such that its opening area is smaller than the surface area of ​​the downstream end surface. This allows air to be retained by the downstream end surface of the water conduit. As a result, it is possible to suppress abnormal noise when air is discharged from the discharge port with a simple structure.

[0009] Furthermore, in the present invention, preferably, the water outlet is positioned below the vertical center of the downstream end face. In the present invention configured in this way, the water outlet is positioned below the vertical center of the downstream end face, allowing air to be retained in the upper region of the downstream end of the water conduit, thus enabling the retention of more air.

[0010] In the present invention, preferably, the downstream end of the water conduit is formed to extend in a straight line. In the present invention configured in this way, the downstream end of the water conduit is formed to extend in a straight line, so that the cleaning water flows in the axial direction of the water conduit and can push the air upward.

[0011] Furthermore, in the present invention, preferably, a flush toilet that washes with flushing water to discharge waste, comprising: a bowl portion having a waste receiving surface for receiving waste, a rim portion formed above the waste receiving surface, and a pot portion formed below the waste receiving surface with a water reservoir surface formed inside; a drain trap pipe connected below the bowl portion for discharging waste; a jet outlet provided below the bowl portion for discharging flushing water toward the inlet of the drain trap pipe; and a jet water channel, at least a portion of which is positioned above the water reservoir surface, for guiding flushing water supplied from a water source to the jet outlet, wherein an air retention section is formed in the jet water channel where air accumulates, and this air retention section is located at the downstream end of the jet water channel. In the present invention configured as described above, an air retention section is formed in the jet water channel, and since this air retention section is located at the downstream end of the jet water channel, the jet water channel can be constructed more simply compared to the conventional case where the air retention section is located in the middle of the jet water channel. As a result, abnormal noise when air is discharged from the jet outlet can be suppressed with a simple structure.

[0012] Preferably, the present invention provides a flush toilet that washes with flushing water to discharge waste, comprising: a bowl portion having a waste receiving surface for receiving waste, a rim portion formed above the waste receiving surface, and a pot portion formed below the waste receiving surface with a water reservoir inside; a drain trap pipe connected below the bowl portion for discharging waste; a rim outlet provided in the rim portion for discharging flushing water along the inner circumferential surface of the rim portion; and a rim water channel, at least a portion of which is positioned above the water reservoir, for guiding flushing water supplied from a water source to the rim outlet, wherein an air reservoir is formed in the rim water channel where air accumulates, and this air reservoir is located at the downstream end of the rim water channel. In the present invention configured in this way, an air retention section is formed in the rim water channel, and since this air retention section is located at the downstream end of the rim water channel, the rim water channel can be constructed more simply compared to the conventional case where the air retention section is provided in the middle of the rim water channel. As a result, abnormal noise when air is discharged from the rim outlet can be suppressed with a simple structure. [Effects of the Invention]

[0013] According to the flush toilet of the present invention, a simple structure can suppress abnormal noise when air is discharged from the water outlet. [Brief explanation of the drawing]

[0014] [Figure 1] This is an overall diagram of a flush toilet according to the first embodiment of the present invention. [Figure 2] Figure 1 is a magnified view of a portion of the area around the jet nozzle. [Figure 3] It is a cross-sectional view taken along line III-III in FIG. 2 [Figure 4] It is a schematic diagram showing the flow of flushing water and air in the jet water conduit of the flush toilet according to the first embodiment of the present invention [Figure 5] It is a partial enlarged view of the vicinity of the rim outlet of the flush toilet according to the second embodiment of the present invention DESCRIPTION OF EMBODIMENTS

[0015] Hereinafter, a flush toilet according to a first embodiment of the present invention will be described with reference to the accompanying drawings First, the overall configuration of the flush toilet according to the first embodiment of the present invention will be described with reference to FIG. 1 FIG. 1 is an overall configuration diagram of a flush toilet according to a first embodiment of the present invention

[0016] As shown in FIG. 1, the flush toilet 1 according to the present embodiment is a siphon jet type toilet that discharges filth by generating a siphon action with flushing water discharged from a jet outlet. The flush toilet 1 includes a ceramic toilet body 2 and a flushing water supply device 3 for supplying flushing water to the toilet body 2

[0017] The toilet body 2 is formed with a bowl-shaped bowl portion 4 and a drainage trap pipe 6 connected below the bowl portion 4 for discharging filth. The bowl portion 4 includes a filth receiving surface 8 for receiving filth, a rim portion 10 formed above the filth receiving surface 8, and a trap portion 12 formed below the filth receiving surface with a water storage level WL formed therein

[0018] The rim portion 10 is provided with a rim water outlet 14 for discharging flushing water. When the flush toilet 1 is viewed from the front, the rim water outlet 14 is disposed on the right front side of the bowl portion 4. The rim water outlet 14 opens toward the rear, and is configured such that flushing water discharged from the rim water outlet 14 swirls along the inner peripheral surface 10a of the rim portion 10

[0019] Below the bowl portion 4, a jet water spout 16 for discharging flush water is formed. The jet water spout 16 is arranged at a position facing the inlet 6a of the drain trap pipe line 6. The jet water spout 16 opens toward the inlet 6a of the drain trap pipe line 6, and is configured such that the flush water discharged from the jet water spout 16 flows into the drain trap pipe line 6 to generate a siphon action at an early stage.

[0020] The drain trap pipe line 6 comprises an inlet 6a, an ascending pipe line 6b ascending from the inlet 6a, and a descending pipe line 6c descending from the ascending pipe line 6b, with a top portion 6d formed between the ascending pipe line 6b and the descending pipe line 6c. A drain socket 18 is connected to the lower end of the descending pipe line 6c of the drain trap pipe line 6, and is connected to a drain pipe (not shown) provided on a floor surface.

[0021] Further, the flush water supply device 3 is connected via a stop valve 19 to a water pipe 20 serving as a water supply source, and is configured to discharge flush water from the rim water spout 14 and the jet water spout 16 by the water supply pressure of the tap water. The flush water supply device 3 is provided with a constant flow valve 22, a solenoid on-off valve 24, and a water supply channel switching valve 26 respectively from the upstream side. Further, on the downstream side of the water supply channel switching valve 26, a rim water guide channel 28 for supplying flush water to the rim water spout 14 and a jet water guide channel 30 for supplying flush water to the jet water spout 16 are connected.

[0022] The constant flow valve 22 is configured to throttle the flush water flowing in from the water pipe 20 to a predetermined flow rate or less. The solenoid on-off valve 24 is a diaphragm-type solenoid on-off valve, and is configured to open and allow water to flow when a user presses a toilet flush switch (not shown), and close and stop water supply when a predetermined time elapses.

[0023] The water supply channel switching valve 26 is capable of supplying cleaning water to either or both of the rim water channel 28 and the jet water channel 30, and is configured to arbitrarily change the ratio of the amount and flow rate of cleaning water discharged from the rim discharge port 14 and the jet discharge port 16. The water supply channel switching valve 26 is equipped with a control unit (not shown) for controlling the flow rate of cleaning water supplied to the water supply channel switching valve 26, and is configured to operate mechanically in response to fluctuations in flow rate to change the ratio of the amount and flow rate of water discharged from the rim and the jet. In this embodiment, the water supply channel switching valve is configured to operate in response to flow rate control from the water source, but a pressurizing pump may be provided upstream of the water supply channel switching valve and it may be configured to operate mechanically in response to changes in the water pressure of the cleaning water supplied from the pressurizing pump, or the water supply channel switching valve may be configured to be electrically driven by a rotor and motor, or it may be configured to operate mechanically in response to a decrease in water level.

[0024] The rim water channel 28 and the jet water channel 30 are made of cylindrical pipes made of resin. The upstream end of the rim water channel 28 is connected to the water supply channel switching valve 26, and the downstream end is connected to the rim outlet 14. The upstream end of the jet water channel 30 is connected to the water supply channel switching valve 26, and the downstream end is connected to the jet outlet 16. At least a portion of the rim water channel 28 and the jet water channel 30 are located above the water level WL. In this embodiment of the flush toilet 1, the rim water channel 28 and the jet water channel 30 are made of resin pipes, but are not limited to this, and may be made of flexible rubber tubing or integrally formed with the toilet body 2 from ceramic.

[0025] The rim water channel 28 and the jet water channel 30 are each provided with vacuum breakers 32 and 34, respectively, located above the water level WL, to draw air into each water channel from the outside. The vacuum breakers 32 and 34 are check valves that open and close intake holes (not shown), and are configured to close the intake holes when flushing water is flowing through the water channel and to open the intake holes when flushing water is not flowing through the water channel. In this embodiment of the flush toilet 1, vacuum breakers are used, but the invention is not limited to this, and other configurations are possible as long as air can be drawn into the water channel.

[0026] Next, the jet water channel 30 and jet outlet 16 of the flush toilet 1 according to this embodiment will be described in detail with reference to Figures 2 and 3. Figure 2 is a magnified view of a portion of the area around the jet outlet in Figure 1, and Figure 3 is a cross-sectional view along line III-III in Figure 2.

[0027] The jet conduit 30 is configured such that the cross-sectional area and shape of the flow channel cross-section (a cross-section perpendicular to the flow direction of the cleaning water) are substantially the same from the upstream end to the downstream end. The cross-sectional shape of the jet conduit 30 is formed in a perfectly circular shape. A downstream end 30a extending almost horizontally in a straight line is provided on the downstream side of the jet conduit 30 (near the jet outlet 16). The jet outlet 16 is formed on the downstream end face 30b of the downstream end 30a. The downstream end face 30b is the surface that forms the furthest downstream end of the jet conduit 30. As shown in Figure 2, in a side view, the center line CL1 extending axially by bisecting the jet outlet 16 vertically is set to be substantially parallel to the center line CL2 extending axially by bisecting the flow channel cross-section of the downstream end 30a vertically.

[0028] As shown in Figure 2, the downstream end face 30b of the downstream end 30a extends almost vertically so as to be perpendicular to the axial direction of the jet water conduit 30, and intersects at a right angle with the upper surface 30c and the bottom surface 30d of the downstream end 30a. Also, as shown in Figure 3, the jet outlet 16 is formed such that its opening area is smaller than the surface area of ​​the downstream end face 30b. Furthermore, as shown in Figure 3, in a front view, the jet outlet 16 is positioned below the center line CL3 that bisects the downstream end face 30b vertically and extends horizontally. As a result, the air flowing through the jet water conduit 30 along with the cleaning water is blocked by the upper portion A of the downstream end face 30b of the downstream end 30a, forming an air retention area S1 within the downstream end 30a where air accumulates (see Figure 2). Also, as shown in Figure 3, the jet outlet 16 is formed in a flattened shape that is elongated in the horizontal direction.

[0029] Next, with reference to Figure 4, the flow (operation) of flushing water and air in the jet water channel of the flush toilet according to this embodiment will be explained. Figure 4 is a schematic diagram showing the flow of flushing water and air in the jet water channel of a flush toilet according to the first embodiment of the present invention. In Figure 4, "a" represents air and "w" represents flushing water.

[0030] First, when the user presses the toilet flushing switch, the electromagnetic valve 24 opens and the water supply channel switching valve 26 is activated, supplying flushing water to the rim water channel 28. As a result, flushing water is discharged from the rim outlet 14, and the waste receiving surface 8 of the bowl section 4 is cleaned.

[0031] Next, after a predetermined time has elapsed, the water supply channel switching valve 26 is activated, and cleaning water is supplied to the jet water channel 30. As a result, cleaning water is discharged from the jet outlet 16, the drain trap pipe 6 quickly fills up, a siphon effect occurs, and waste is discharged. Here, before the start of cleaning, air is present in the jet water channel 30 in the portion above the water level WL (the portion X in Figure 1). When cleaning water is supplied to the jet water channel 30, the cleaning water flows through the jet water channel 30, pushing the air along with it.

[0032] As shown in Figure 4, an air retention section S1 is formed at the downstream end 30a of the jet water conduit 30. As a result, most of the air pushed by the cleaning water remains in the air retention section S1 instead of being discharged from the jet outlet 16. Specifically, most of the air pushed by the cleaning water flows along the downstream end 30a, which extends almost horizontally in a straight line, and flows upward along the downstream end 30a. The air flowing in the upper region of the downstream end 30a is then blocked by the downstream end face 30b and remains in the air retention section S1 instead of being discharged from the jet outlet 16. This makes it possible to suppress abnormal noise when water is discharged from the jet outlet 16.

[0033] Furthermore, after a predetermined time has elapsed, the water supply channel switching valve 26 is activated, and flushing water is supplied to the rim water channel 28. As a result, flushing water is discharged from the rim outlet 14, water is collected in the bowl section 4, and the toilet flushing is completed.

[0034] In the flush toilet 1 according to this embodiment, an air retention section S1 where air accumulates is formed in the jet water channel 30, and since this air retention section S1 is located at the downstream end 30a of the jet water channel 30, the jet water channel 30 can be constructed more simply compared to the conventional case where the air retention section is provided in the middle of the jet water channel. As a result, abnormal noise when air is discharged from the jet outlet 16 can be suppressed with a simple structure.

[0035] Furthermore, in the flush toilet 1 according to this embodiment, the jet outlet 16 is formed on the downstream end surface 30b of the downstream end 30a of the jet water channel 30, and the jet outlet 16 is formed such that its opening area is smaller than the surface area of ​​the downstream end surface 30b. This allows air to be retained by the downstream end surface 30b of the downstream end 30a of the jet water channel 30. As a result, abnormal noise when air is discharged from the jet outlet 16 can be suppressed with a simple structure.

[0036] In the flush toilet 1 according to this embodiment, the jet outlet 16 is positioned below the vertical center of the downstream end face 30b, so that air can be retained in the upper region of the downstream end 30a of the jet water channel 30, allowing for the retention of more air.

[0037] Furthermore, in the flush toilet 1 according to this embodiment, the downstream end 30a of the jet water channel 30 is formed to extend in a straight line, so that the flushing water flows in the axial direction of the jet water channel 30 and can push the air upward.

[0038] Next, a flush toilet according to a second embodiment of the present invention will be described with reference to Figure 5. Figure 5 is a partially enlarged view of the area near the rim spout of a flush toilet according to a second embodiment of the present invention. Since the basic configuration of the flush toilet according to the second embodiment is the same as that of the first embodiment described above, only the parts that differ from the first embodiment will be described below.

[0039] First, the second embodiment differs from the first embodiment in that an air retention section S2 is provided in the rim water conduit 38. The rim water conduit 38 is configured such that the cross-sectional area and shape of the flow channel cross-section (a cross-section perpendicular to the flow direction of the washing water) are substantially the same from the upstream end to the downstream end. The cross-sectional shape of the rim water conduit 38 is formed in a perfectly circular shape. A downstream end 38a is provided on the downstream side of the rim water conduit 38 (near the rim discharge port 40), extending in a straight line in a substantially horizontal direction. The rim discharge port 40 is formed on the downstream end face 38b of the downstream end 38a. The downstream end face 38b is the surface that forms the furthest downstream end of the rim water conduit 38. As shown in Figure 5, in a side view, the center line CL4 extending axially by bisecting the rim discharge port 40 vertically is set to be substantially parallel to the center line CL5 extending axially by bisecting the flow channel cross-section of the downstream end 38a vertically.

[0040] As shown in Figure 5, the downstream end face 38b of the downstream end 38a extends almost vertically so as to be perpendicular to the axial direction of the rim water channel 38, and intersects at a right angle with the upper surface 38c and bottom surface 38d of the downstream end 38a. Also, as shown in Figure 5, the rim outlet 40 is formed such that its opening area is smaller than the surface area of ​​the downstream end face 38b. Furthermore, the rim outlet 40 is positioned below the center line that bisects the downstream end face 38b vertically and extends horizontally. As a result, the air flowing through the rim water channel 38 along with the cleaning water is blocked by the upper portion of the downstream end face 38b of the downstream end 38a, forming an air retention area S2 within the downstream end 38a where air accumulates (see Figure 5).

[0041] In the flush toilet 1 according to this embodiment, an air retention section S2 is formed in the rim water channel 38, and since this air retention section S2 is located at the downstream end 38a of the rim water channel 38, the rim water channel 38 can be constructed more simply compared to the conventional case where the air retention section is provided in the middle of the rim water channel. As a result, abnormal noise when air is discharged from the rim outlet 40 can be suppressed with a simple structure.

[0042] In this embodiment, an example of applying the present invention to a siphon-jet type toilet has been described, but the invention is not limited to this, and can also be applied to siphon-type toilets that do not have a jet nozzle, and to wash-down type toilets that discharge waste by the action of flowing water. Furthermore, in this embodiment, an example of using a water pipe as the water source has been described, but the water source may be a tank that stores flushing water or a pressure pump.In addition, in this embodiment, an example of applying the present invention to a direct-pressure type toilet that supplies flushing water by water pressure has been described, but the invention is not limited to this, and can also be applied to tank-type toilets and pump-type toilets that supply flushing water by a pressure pump.

[0043] The present invention is not limited to the embodiments described above, and various modifications and variations are possible within the scope of the technical idea described in the claims. [Explanation of symbols]

[0044] 1: Flush toilet 2: Toilet bowl 3: Washing water supply device 4: Bowl section 6: Drain trap pipe 6a: Inlet of drain trap pipe 8: Waste receiving surface 10: Rim section 14: Rim spout 16: Jet nozzle 28: Rim water conduit 30: Jet water conduit 30a: Downstream end of the jet conduit 30b: Downstream end face of the jet conduit 30c: Top surface of the jet conduit 30d: Bottom surface of the jet conduit 32: Vacuum breaker 34: Vacuum breaker 38: Rim water conduit 38a: Downstream end of the rim conduit 38b: Downstream end face of the rim water channel 38c: Upper surface of the rim water channel 38d: Bottom surface of the rim water channel 40: Rim spout S1: Air retention area S2: Air retention area WL: Reservoir surface

Claims

1. A flush toilet that uses flushing water to wash away waste, A bowl portion comprising a waste receiving surface for receiving waste, a rim portion formed above the waste receiving surface, and a pot portion formed below the waste receiving surface with a water reservoir inside, A drain trap pipe for discharging waste is connected to the bottom of this bowl section, The bowl section is provided with a spout for discharging cleaning water, At least a portion of it is located above the surface of the accumulated water, and includes a water conduit for guiding the cleaning water supplied from the water source to the outlet, It has, The above-mentioned water conduit has an air retention section where air accumulates. A flush toilet characterized by having an air retention section located at the downstream end of the above-mentioned water conduit.

2. The above-mentioned discharge port is formed on the downstream end face of the downstream end of the above-mentioned water conduit, The flush toilet according to claim 1, wherein the water outlet is formed such that its opening area is smaller than the surface area of ​​the downstream end face.

3. The flush toilet according to claim 2, wherein the water outlet is positioned below the vertical center of the downstream end face.

4. The flush toilet according to any one of claims 1 to 3, wherein the downstream end of the above-mentioned water conduit is formed to extend in a straight line.

5. A flush toilet that uses flushing water to wash away waste, A bowl portion comprising a waste receiving surface for receiving waste, a rim portion formed above the waste receiving surface, and a pot portion formed below the waste receiving surface with a water reservoir inside, A drain trap pipe for discharging waste is connected to the bottom of this bowl section, A jet nozzle is provided below the bowl section and discharges cleaning water toward the entrance of the drain trap pipe, At least a portion of the jet conduit is located above the surface of the accumulated water, and guides the cleaning water supplied from the water source to the jet outlet. It has, The above-mentioned jet water channel has an air retention section where air accumulates. This flush toilet is characterized by having an air retention section located at the downstream end of the jet water channel.

6. A flush toilet that uses flushing water to wash away waste, A bowl portion comprising a waste receiving surface for receiving waste, a rim portion formed above the waste receiving surface, and a pot portion formed below the waste receiving surface with a water reservoir inside, A drain trap pipe for discharging waste is connected to the bottom of this bowl section, A rim outlet is provided on the rim portion and discharges cleaning water along the inner circumferential surface of the rim portion, At least a portion of it is located above the water surface, and includes a rim water channel for guiding the cleaning water supplied from the water source to the rim outlet, It has, An air retention section is formed in the above-mentioned rim water channel, where air accumulates. This flush toilet is characterized by having an air retention section located at the downstream end of the rim water channel.

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