Washing toilet

Abstract

A flush toilet according to the present invention is provided with: a water storage tank for storing flush water; a basin part; a rim spouting port for spouting wash water toward the bowl part; the drainage elbow pipeline is arranged at the bottom of the basin part; a spraying water outlet which is arranged at the bottom of the basin part and discharges washing water towards the inlet part of the drainage elbow pipeline; a jet water guide path that connects the jet spout port and the water storage tank and supplies the flush water from the water storage tank to the jet spout port; and a water discharge device that supplies or stops supplying the flush water stored in the water storage tank to the injection water conduit, the water discharge device being driven to cause the flush water in the water storage tank to flow into the injection water conduit, thereby discharging a first flow rate of flush water from the injection water discharge port, and after the completion of the discharge of the first flow rate, discharging the flush water in the water storage tank into the injection water conduit. The flush water retained in the injection water guide path flows toward the injection water discharge port, and a second flow rate of flush water is discharged from the injection water discharge port.

Description

Technical Field

[0001] The invention relates to a water-washing toilet, in particular to a jet siphon type water-washing toilet. Background Art

[0002] In the past, there is a known jet siphon flush toilet, which spouts flush water from a jet spouting port and discharges waste by generating a siphon effect in a drain elbow pipe. The jet siphon flush toilet has a low-profile toilet, which has a water storage tank for storing flush water, and the lower part of the water storage tank is arranged at a position lower than the upper surface of the inner edge (for example, Patent Document 1 and Patent Document 2). The advantage of the low-profile toilet is that the height of the water storage tank is low, and the appearance design of the entire toilet is good.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent document 1: Japanese Patent Publication No. 2010-531399;

[0006] Patent document 2: Japanese Patent Application Publication No. 2006-291451. Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, in the low-profile jet siphon flush toilet, a portion of the water tank is disposed at a position lower than the upper surface of the inner edge, and the jet conduit is disposed at a position lower than the top of the drainage elbow. Therefore, there is a problem that since sufficient head pressure cannot be applied to the flushing water flowing in the jet conduit, it is impossible to perform jet spouting sufficient to discharge waste, thereby reducing the sewage discharge performance.

[0009] Therefore, the present invention is proposed to solve the above-mentioned problems, and its purpose is to provide a water flush toilet, which is a jet siphon type water flush toilet that can spray water sufficient to discharge waste, thereby improving the sewage discharge performance.

[0010] Means used to solve problems

[0011] In order to achieve the above-mentioned purpose, the present invention is a jet siphon type flush toilet, characterized in that it has: a water storage tank for storing flush water; a bowl having a bowl-shaped dirt receiving surface and an inner edge formed at an upper edge; an inner edge water spouting port, which is provided at the inner edge and spouts flush water toward the bowl; a drainage elbow pipeline, which is provided at the bottom of the bowl and includes: an ascending pipeline extending upward; a descending pipeline extending downward from the ascending pipeline; and a top portion, which is located between the descending pipeline and the ascending pipeline and defines a water seal water level;

[0012] A jet water spouting port, which is arranged at the bottom of the bowl and spouts washing water toward the inlet of the drainage elbow pipe; a jet water conduit, which connects the jet water spouting port and the water storage tank and supplies washing water from the water storage tank to the jet water spouting port; and a drainage device, which supplies or stops supplying washing water stored in the water storage tank to the jet water conduit, the drainage device is driven to make the washing water in the water storage tank flow into the jet water conduit, thereby spouting a first flow rate of washing water from the jet water spouting port, and after the spouting of the first flow rate is completed, the washing water retained in the jet water conduit flows toward the jet water spouting port, thereby spouting a second flow rate of washing water from the jet water spouting port.

[0013] In the present invention thus constituted, the drainage device is driven to cause the washing water in the water storage tank to flow into the jet water conduit, thereby spouting the washing water of the first flow rate from the jet water spouting port. After the spouting of the first flow rate is completed, the washing water retained in the jet water conduit flows toward the jet water spouting port, thereby spouting the washing water of the second flow rate from the jet water spouting port. Therefore, the siphon effect can be generated at the first flow rate, and the siphon effect can be continued at the second flow rate. Thus, the siphon effect sufficient to discharge waste can be generated and continued, thereby improving the sewage discharge performance.

[0014] Furthermore, in the present invention, preferably, the maximum instantaneous flow rate of the second flow rate is set to be smaller than the maximum instantaneous flow rate of the first flow rate.

[0015] In the present invention thus constituted, since the maximum instantaneous flow rate of the second flow rate is set smaller than the maximum instantaneous flow rate of the first flow rate, the siphon effect can be continued by the second flow rate having a smaller maximum instantaneous flow rate, thereby achieving both improved sewage discharge performance and water conservation.

[0016] In the present invention, preferably, the instantaneous flow rate of the second flow rate is set to increase to the maximum instantaneous flow rate more slowly than the instantaneous flow rate of the first flow rate.

[0017] In the present invention thus constituted, since the instantaneous flow rate of the second flow rate is set to increase slowly to the maximum instantaneous flow rate compared to the instantaneous flow rate of the first flow rate, it is possible to suppress turbulence of the washing water ejected from the jet water spouting port compared to the case where the instantaneous flow rate is increased sharply. Thus, the washing water can flow smoothly into the drainage trap pipe and the siphon effect can be continued.

[0018] Furthermore, in the present invention, it is preferable to set the washing water volume for large washing or the washing water volume for small washing to be switched by adjusting the jet water discharge time at the first flow rate.

[0019] In the present invention thus constituted, since the flush water volume for large washing or small washing is switched by adjusting the jet water spouting time at the first flow rate, the flush water volume can be switched accurately.

[0020] In the present invention, preferably, after the drainage device stops, flush water is spouted at the second flow rate from the jet water spouting port.

[0021] In the present invention thus constituted, since flush water is spouted at the second flow rate from the jet water spouting port after the drainage device stops, flush water accumulated in the jet water conduit can be spouted at the second flow rate from the jet water spouting port.

[0022] Furthermore, in the present invention, preferably, the jet water conduit comprises: an upstream flow path extending forward from a water storage tank; a curved flow path curved from the upstream flow path; and a downstream flow path extending rearward from the curved flow path and connected to the jet water spouting port, the upstream flow path being arranged substantially parallel to the drainage bend pipe conduit, and the bottom surface of the downstream side of the upstream flow path being located below the upper end of the inlet portion of the drainage bend pipe conduit.

[0023] In the present invention thus constructed, since the upstream flow path is arranged roughly parallel to the drainage bend pipe, the bottom surface of the downstream side of the upstream flow path is located lower than the upper end of the inlet portion of the drainage bend pipe. Therefore, even if the water seal water level drops and the siphon effect is about to end, the siphon effect can be continued because the washing water continues to remain on the downstream side of the upstream flow path.

[0024] In the present invention, preferably, in a region on the front side of the top of the drainage trap conduit, the bottom surface of the upstream flow path is located below the upper end of the inlet portion of the drainage trap conduit.

[0025] In the present invention thus constructed, since the bottom surface of the upstream flow path is located below the upper end of the inlet portion of the drainage bend pipe in the area further forward than the top of the drainage bend pipe, even if the water seal water level drops and the siphon effect is about to end, the siphon effect can be continued because the washing water continues to remain in the upstream flow path.

[0026] Furthermore, in the present invention, preferably, the center of the jet water spouting port is arranged at the lowest position in the central axis of the jet water conduit.

[0027] In the present invention thus constituted, since the center of the jet water spouting port is arranged at the lowest position in the central axis of the jet water conduit, flush water can be spouted from the jet water spouting port for a long period of time.

[0028] In the present invention, preferably, the water tank is provided with an overflow pipe, and the overflow pipe discharges the water overflowing from the water tank, and the overflow pipe is arranged at the same position as the drainage device or further behind the drainage device.

[0029] In the present invention thus constructed, since the water tank is provided with an overflow pipe, the overflow pipe discharges the water overflowing from the water tank, and the overflow pipe is provided at the same position as the drainage device or further rearward than the drainage device, air replacement can be performed via the overflow pipe on the rear side of the jet water conduit, thereby preventing the flow of washing water to the jet water outlet from being obstructed by air replacement.

[0030] Furthermore, in the present invention, preferably, the jet water conduit has a volume of 1 / 3 or more of the water storage tank.

[0031] In the present invention thus constituted, since the jet water conduit has a volume of 1 / 3 or more of the water storage tank, a large amount of flush water can be retained in the jet water conduit. Thus, even if the water storage tank is miniaturized, jet water spouting sufficient to discharge waste can be performed.

[0032] In the present invention, preferably, the jet water conduit comprises: an upstream flow path extending forward from a water storage tank; a curved flow path curved from the upstream flow path; and a downstream flow path extending rearward from the curved flow path and connected to the jet water spouting port, the downstream flow path of the jet water conduit being formed with a curved portion, the curved portion being eccentric to the opposite side of the upstream flow path relative to the central axis of the jet water spouting port in a top view, and the curved portion being arranged in the water seal area in a top view.

[0033] In the present invention thus constituted, since the downstream flow path of the jet water conduit is formed with a curved portion, and the curved portion is eccentric to the opposite side of the upstream flow path relative to the central axis of the jet water spouting port, the flow velocity distribution of the washing water spouted from the jet water spouting port can be made substantially uniform. In addition, since the curved portion is arranged in the water seal area, the jet water conduit can be made compact. Thus, even if the jet water conduit is made compact, jet water spouting sufficient to discharge waste can be performed, thereby improving waste discharge performance.

[0034] Furthermore, in the present invention, preferably, the curved flow path is arranged within the water seal region in a plan view.

[0035] In the present invention thus constituted, since the curved flow path is arranged in the water seal area, the jet water conduit can be made compact. In addition, since the curved flow path is arranged in the water seal area, the curved flow path can be always kept full of water. Thus, air can be suppressed from being trapped in the curved flow path, so that the flow velocity distribution of the washing water ejected from the jet water spouting port is roughly uniform.

[0036] In the present invention, preferably, a flow straightening portion is formed in the downstream flow passage on the downstream side of the curved portion, and the flow straightening portion extends linearly toward the jet water spouting port.

[0037] In the present invention thus constructed, since a rectifying portion is formed in the downstream flow path further downstream than the curved portion, and the rectifying portion extends in a straight line toward the jet water spouting port, the cleaning water flowing through the curved portion can be rectified, thereby making the flow velocity distribution of the cleaning water ejected from the jet water spouting port roughly uniform.

[0038] In addition, in the present invention, preferably, there is also a buffer portion, which is arranged at the bottom of the basin portion and connects the jet water spouting port and the inlet portion of the drainage bend pipe. The jet water conduit has: an upstream side flow path, which extends forward from the water storage tank; a curved flow path, which bends from the upstream side flow path; and a downstream side flow path, which extends backward from the curved flow path and is connected to the jet water spouting port. The jet water conduit and / or the buffer portion are configured to allow the cleaning water ejected from the jet water spouting port to flow toward the center of the inlet portion of the drainage bend pipe.

[0039] In the present invention thus constituted, since the jet water conduit and / or the buffer portion are configured to allow the washing water ejected from the jet water spouting port to flow toward the center of the inlet portion of the drainage bend pipe, even if the jet water conduit is made compact, the washing water can be ejected from the jet water spouting port toward the center of the inlet portion of the drainage bend pipe. Thus, the jet water conduit can be made compact while jet water spouting sufficient to discharge waste can be performed, thereby improving waste discharge performance.

[0040] In the present invention, preferably, the inner peripheral surface of the curved flow path of the jet water conduit has a curvature radius smaller on the downstream side than on the upstream side in a plan view.

[0041] In the present invention thus constituted, the inner peripheral surface of the curved flow path of the jet water conduit has a smaller curvature radius on the downstream side than on the upstream side in a plan view, and the inner peripheral surface on the downstream side of the curved flow path, which is the portion where water accumulation occurs, is formed with a relatively small curvature radius. Therefore, it is possible to suppress energy loss while making the curved flow path compact.

[0042] Furthermore, in the present invention, preferably, the outer peripheral surface of the curved flow path of the jet water conduit has a curvature radius larger on the downstream side than on the upstream side in a plan view.

[0043] In the present invention thus constructed, the outer peripheral surface of the curved flow path of the jet water conduit has a larger curvature radius on the downstream side than on the upstream side when viewed from above. The outer peripheral surface on the downstream side of the curved flow path through which relatively more washing water flows is formed with a relatively large curvature radius. Therefore, while the flow velocity can be maintained, the separation of water flow from the outer peripheral surface of the curved flow path can be suppressed.

[0044] In the present invention, preferably, the bottom surface of the curved flow path of the jet water conduit is formed to be substantially horizontal, the upper surface of the curved flow path is inclined downward from the upstream side to the downstream side, and the height position of the upper surface of the curved flow path is higher on the outer peripheral side than on the inner peripheral side.

[0045] In the present invention thus constructed, the bottom surface of the curved flow path of the jet water conduit is formed approximately horizontally, and the upper surface of the curved flow path is inclined downward from the upstream side toward the downstream side. The height position of the upper surface of the curved flow path on the outer peripheral surface side is higher than the height position on the inner peripheral surface side. Therefore, in the flow cross-sectional area of ​​the curved flow path, the area on the outer peripheral surface side is set larger than the area on the inner peripheral surface side, thereby suppressing the separation of water flow on the outer peripheral surface side where relatively more washing water flows.

[0046] Furthermore, in the present invention, preferably, the jet water conduit comprises: an upstream flow path extending forward from a water storage tank; a curved flow path curved from the upstream flow path; and a downstream flow path extending rearward from the curved flow path and connected to the jet water spouting port, the downstream flow path of the jet water conduit being formed with a tightening portion having the smallest flow path cross-sectional area in the jet water conduit, and a cross-sectional area-fixed portion having a fixed flow path cross-sectional area being formed on the jet water conduit further upstream than the tightening portion.

[0047] In the present invention thus constituted, a constriction portion is formed on the downstream side of the jet water conduit, and the constriction portion has the smallest cross-sectional area of ​​the flow path in the jet water conduit, and a cross-sectional area fixing portion having a fixed cross-sectional area of ​​the flow path is formed on the jet water conduit on the upstream side of the constriction portion. Therefore, the cross-sectional area fixing portion can suppress the pressure loss caused by the narrowing of the flow path while guiding the washing water to the downstream side, and then the constriction portion increases the flow velocity, so that the washing water is spouted from the jet water spouting port. Thus, jet water spouting sufficient to discharge waste can be performed, and waste discharge performance can be improved.

[0048] In the present invention, preferably, the flow path cross-sectional area of ​​the constricted portion gradually decreases toward the jet water spouting port.

[0049] In the present invention thus constituted, since the flow path cross-sectional area of ​​the constricted portion gradually decreases toward the jet water spouting port, the flow velocity of the washing water passing through the constricted portion can gradually increase toward the jet water spouting port.

[0050] Furthermore, in the present invention, preferably, the cross-sectional area fixed portion is formed in the curved flow path.

[0051] In the present invention thus constituted, since the cross-sectional area constant portion is formed in the curved flow path, it is possible to avoid the simultaneous occurrence of pressure loss due to the curvature of the flow path and pressure loss due to the narrowing of the flow path in the curved flow path.

[0052] Effects of the Invention

[0053] According to the flush toilet of the present invention, there can be provided a flush toilet which is a jet siphon type flush toilet capable of performing jet spouting of water sufficient to discharge waste, thereby improving waste discharge performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 is a top view showing a flush toilet according to a first embodiment of the present invention;

[0055] Figure 2 is along Figure 1 A side cross-sectional view when observing along line II-II;

[0056] Figure 3 is a perspective view showing the entire jet water conduit according to the first embodiment of the present invention;

[0057] Figure 4 Yes Figure 2 A partially enlarged view of a jet water spouting port of a flush toilet according to the first embodiment shown in FIG.

[0058] Figure 5 yes Figure 1 A top cross-sectional view of a downstream portion of a jet conduit of a flush toilet according to a first embodiment of the present invention;

[0059] Figure 6 is along Figure 2 A top cross-sectional view when observing along line VI-VI;

[0060] Fig. 7A Yes means Figure 5 and Figure 6 A diagram showing a flow path cross section A of a jet conduit of a flush toilet according to the first embodiment;

[0061] Figure 7B Yes means Figure 5 and Figure 6 A diagram showing a flow path cross section B of a jet conduit of a flush toilet according to the first embodiment;

[0062] Figure 7C Yes means Figure 5 and Figure 6 A diagram showing a flow path cross section C of a jet water conduit of a flush toilet according to the first embodiment;

[0063] Fig.7D Yes means Figure 5 and Figure 6 A diagram showing a flow path cross section D of a jet conduit of a flush toilet according to the first embodiment;

[0064] Fig. 7E Yes means Figure 5 and Figure 6 A diagram showing a flow path cross section E of a jet water conduit of a flush toilet of the first embodiment shown;

[0065] Figure 7F Yes means Figure 5 and Figure 6 A diagram showing a flow path cross section F of a jet conduit of a flush toilet according to the first embodiment;

[0066] Figure 7G Yes means Figure 5 and Figure 6 A diagram showing a flow path cross section G of a jet water conduit of a flush toilet according to the first embodiment;

[0067] Fig. 8A It is a diagram for explaining the flushing action of the flush toilet according to the first embodiment of the present invention;

[0068] Figure 8B It is a diagram for explaining the flushing action of the flush toilet according to the first embodiment of the present invention;

[0069] Figure 8C It is a diagram for explaining the flushing action of the flush toilet according to the first embodiment of the present invention;

[0070] Fig.8D It is a diagram for explaining the flushing action of the flush toilet according to the first embodiment of the present invention;

[0071] Fig. 8E It is a diagram for explaining the flushing action of the flush toilet according to the first embodiment of the present invention;

[0072] Fig.8F It is a diagram for explaining the flushing action of the flush toilet according to the first embodiment of the present invention;

[0073] Fig.9A A line graph showing the instantaneous flow rate of flush water spouted from the jet spouting port and the instantaneous flow rate of flush water flowing into the inlet of the drainage trap pipe during a large flush of the flush toilet according to the first embodiment of the present invention;

[0074] Fig. 9B A line graph showing the instantaneous flow rate of flush water spouted from the jet spouting port and the instantaneous flow rate of flush water flowing into the inlet of the drainage trap pipe during a small flush of the flush toilet according to the first embodiment of the present invention;

[0075] Fig.10 is a side sectional view showing a flush toilet according to a second embodiment of the present invention;

[0076] Fig.11 Yes Fig.10 A partially enlarged view of a jet water spouting port of a flush toilet according to a second embodiment of the present invention;

[0077] Fig.12 is along Fig.10 A top cross-sectional view observed along the XII-XII line;

[0078] Fig.13 This is a graph comparing the amount of kinetic energy accumulated from the start of flushing to the start of siphon action of the flush toilet of the second embodiment of the present invention with that of a conventional product;

[0079] Fig.14 is a top view showing a flush toilet according to a third embodiment of the present invention;

[0080] Fig.15 is along Fig.14 A side cross-sectional view when observing along the XV-XV line;

[0081] Fig.16A 3. A perspective view showing a jet water conduit of a flush toilet according to a third embodiment of the present invention;

[0082] Fig. 16B This is a perspective view for explaining the positional relationship between the jet water conduit and the bowl of a flush toilet according to a third embodiment of the present invention;

[0083] Fig.17 yes Fig.14 A top cross-sectional view of a downstream portion of a jet conduit of a flush toilet according to a third embodiment of the present invention;

[0084] Fig.18A Yes means Fig.17 A diagram showing a flow path cross section A of a jet conduit of a flush toilet according to a third embodiment of the present invention;

[0085] Fig.18B Yes means Fig.17 A diagram showing a flow path cross section B of a jet water conduit of a flush toilet according to a third embodiment of the present invention;

[0086] Fig. 18C Yes means Fig.17 A diagram showing a flow path cross section C of a jet water conduit of a flush toilet according to a third embodiment of the present invention;

[0087] Fig.18D Yes means Fig.17 A diagram showing a flow path cross section D of a jet water conduit of a flush toilet according to a third embodiment of the present invention;

[0088] Fig.18EYes means Fig.17 A diagram showing a flow path cross section E of a jet water conduit of a flush toilet according to a third embodiment of the present invention;

[0089] Fig.18F Yes means Fig.17 A diagram showing a flow path cross section F of a jet conduit of a flush toilet according to a third embodiment of the present invention;

[0090] Figure 18G Yes means Fig.17 A diagram showing a flow path cross section G of a jet water conduit of a flush toilet according to a third embodiment of the present invention;

[0091] Fig.19A 1. is a perspective view showing a jet water conduit of a flush toilet according to a fourth embodiment of the present invention;

[0092] Fig.19B It is a perspective view for explaining the positional relationship between the jet water conduit and the bowl of the flush toilet according to the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0093] Hereinafter, a flush toilet 1 according to a first embodiment of the present invention will be described.

[0094] First, according to Figure 1 and Figure 2 , the basic structure of the flush toilet 1 according to the first embodiment will be described.

[0095] Figure 1 1 is a top view showing a flush toilet according to a first embodiment of the present invention. Figure 2 is along Figure 1 Side cross-sectional view when viewed along line II-II.

[0096] like Figure 1 and Figure 2 As shown, the jet siphon flush toilet 1 of the first embodiment comprises: a toilet body 2 made of ceramic; a toilet seat and toilet cover (not shown) made of resin, which are arranged on the upper surface of the toilet body 2; and a water storage tank 4, which is arranged on the rear upper part of the toilet body 2 and is covered by a resin cover (not shown).

[0097] The toilet body 2 is formed with: a bowl 6, which receives waste; a drainage elbow pipe 8, which is arranged at the bottom of the bowl 6 and is used to discharge waste by siphon action; an inner rim water spouting port 10, which performs inner rim water spouting; an inner rim water conduit 12, which supplies clean water to the inner rim water spouting port 10; a jet water spouting port 14, which performs jet water spouting; and a jet water conduit 16, which supplies clean water to the jet water spouting port 14.

[0098] The bowl portion 6 includes a bowl-shaped waste receiving surface 18, an inner edge portion 20 formed along the upper edge portion of the bowl portion 6, and a shelf portion 21 formed between the waste receiving surface 18 and the edge portion 20. In addition, the bowl portion 6 includes a pot portion 22 formed in a region below the waste receiving surface 18 and having a water surface W formed therein.

[0099] Furthermore, the bowl portion 6 includes a buffer portion 50 which is formed below the pot portion 22 (the bottom of the bowl portion 6 ) and connects the jet water spouting port 14 and the inlet portion 8 a of the drainage trap conduit 8 .

[0100] The buffer portion 50 is located below the pot portion 22 and is a region between the jet water spouting port 14 and the inlet portion 8 a of the drain trap conduit 8 .

[0101] The drainage trap pipe 8 includes an inlet 8a, an ascending pipe 8b extending upward from the inlet 8a, a descending pipe 8c extending downward from the ascending pipe 8b, and a top portion 8d located between the descending pipe 8c and the ascending pipe 8b and defining a water seal level.

[0102] At this time, the lower end of the descending conduit 8c of the drain trap conduit 8 is connected to a drain pipe (not shown) via a drain socket (not shown).

[0103] When the toilet body 2 is viewed from the front, the rim spout 10 is formed at the left rear of the rim portion 20. The rim spout 10 spouts flush water forward, and the flush water flows down toward the waste receiving surface 18 while swirling on the inner peripheral surface of the rim portion 20 and the ceiling surface of the ceiling portion 21.

[0104] The rim water conduit 12 is formed into a tapered shape in which the cross section of the flow path gradually decreases toward the rim water spout 10. A water supply hose 13 directly connected to the water pipe is connected to the upstream side of the rim water conduit 12. Wash water is supplied from the water pipe to the rim water conduit 12, and the wash water is spouted from the rim water spout 10 by the water supply pressure of the water pipe.

[0105] The jet water spouting port 14 is formed at the bottom of the bowl portion 6. The jet water spouting port 14 is arranged opposite to the inlet portion 8a of the drain trap pipe 8 and faces the inlet portion 8a of the drain trap pipe 8. The jet water spouting port 14 spouts washing water toward the inlet portion 8a of the drain trap pipe 8, and the washing water flows into the drain trap pipe 8 to activate the siphon action.

[0106] The jet water conduit 16 includes an upstream flow path 16a extending forward from the water storage tank 4, a curved flow path 16b curved from the upstream flow path 16a, and a downstream flow path 16c extending rearward from the curved flow path 16b and connected to the jet water spouting port 14. Wash water is supplied from the water storage tank 4 to the jet water conduit 16, and the wash water is spouted from the jet water spouting port 14 by the water head pressure of the wash water.

[0107] The water storage tank 4 is a gravity-fed water tank that stores flush water for jet spouting and supplies it to the jet spouting port 14. The water storage tank 4 is a small resin water tank having a capacity of about 3 liters. The amount of flush water discharged from the water storage tank 4 in one flushing is about 2 liters. The lower part of the water storage tank 4 is arranged below the upper surface of the inner edge 20 of the toilet body 2 and above the top 8d of the drainage trap pipe 8. As a result, the flush toilet 1 is formed into a low-profile toilet.

[0108] The flush water source for supplying flush water to the jet water spouting port 14 is not limited to the gravity-fed water storage tank shown in the present embodiment, and a water storage tank equipped with a pump such as a booster pump, a jet pump, or a pressure accumulator pump may be used.

[0109] The water storage tank 4 is provided with: a water supply device 24 that supplies washing water to the water storage tank 4; a drainage device 26 that supplies or stops supplying washing water stored in the water storage tank 4 to the jet water conduit 16; and a float switch 28 that detects a state in which the water level of washing water in the water storage tank 4 reaches a water stop level (full water level). In addition, the water storage tank 4 is provided with: a controller (not shown) that controls the water supply device 24 and the drainage device 26 to drive or stop them based on an operation signal of a user; and an operation unit (not shown) that sends an operation signal in response to an operation of the user.

[0110] The water supply device 24 includes a constant flow valve (not shown) connected to a water pipe, a rim-side electromagnetic valve 23 that supplies or stops supplying washing water to the rim water outlet 10, and a tank-side electromagnetic valve 27 that supplies or stops supplying washing water to a tank water supply port 25 disposed in the water storage tank 4. The rim-side electromagnetic valve 23 and the tank-side electromagnetic valve 27 are configured to be driven by a command of a controller based on an operation signal of a user and a water level detection signal of a float switch 28.

[0111] The drainage device 26 includes an overflow pipe 30 that discharges overflow water in the water storage tank 4 to the toilet body 2, a drain valve 32 that is fixed to the lower end of the overflow pipe 30, and a toilet flushing unit 36 ​​that opens or closes the drain valve 32 by moving the overflow pipe 30 up and down by electric driving force. In addition, a guide member 34 that guides the drain valve 32 to move up and down is installed around the drain port 4a of the water storage tank 4. The toilet flushing unit 36 ​​is configured to be driven by a command of a controller based on an operation signal of a user.

[0112] It should be noted that the drainage device is not limited to the drainage valve shown in this embodiment, and a pressure pump, a jet pump, a pressure accumulator pump, etc. may be used instead of the drainage valve.

[0113] The controller is electrically connected to the operation unit, the float switch 28, the rim side electromagnetic valve 23, the tank side electromagnetic valve 27, and the toilet flushing unit 36, and can receive or send various signals. The controller is configured to receive a cleaning start signal of a large cleaning or a small cleaning from the operation unit, and drive or stop the rim side electromagnetic valve 23, the tank side electromagnetic valve 27, and the toilet flushing unit 36 ​​based on the pre-stored cleaning sequence. In the large cleaning, the cleaning water volume is about 4.8 liters, and in the small cleaning, the cleaning water volume is about 3.8 liters.

[0114] Next, according to Figure 1 to Figure 4 , the jet water conduit 16 of the flush toilet of the first embodiment is described in detail.

[0115] Figure 3 is a perspective view showing the entire jet water conduit of the first embodiment, Figure 4 Yes Figure 2 This is a partially enlarged view of a jet water spouting port of the flush toilet according to the first embodiment.

[0116] First, if Figure 1 As shown, the jet conduit 16 is formed in a U-shape as a whole. One end of the jet conduit 16 is connected to the drain port 4a of the water storage tank 4 arranged on the right side, and the other end is connected to the jet water spout 14 arranged in the center in the left-right direction. The upstream side flow path 16a of the jet conduit 16 is roughly parallel to the drain elbow pipe 8 and extends forward from the drain port 4a of the water storage tank 4. In addition, the curved flow path 16b of the jet conduit 16 is bent backward from the downstream end of the upstream side flow path 16a (U-turn). Furthermore, the downstream side flow path 16c of the jet conduit 16 extends backward from the downstream end of the curved flow path 16b toward the inlet 8a of the drain elbow pipe 8.

[0117] Next, if Figure 2As shown in FIG. 1 , except for a portion of the upstream flow path 16a located directly below the water storage tank 4 (an area near the drain outlet 4a of the water storage tank 4), the jet conduit 16 is arranged below the top 8d of the drain elbow pipe 8, that is, below the water surface W. Figure 3 As shown in FIG. 1 , the vertical width and horizontal width of the flow path cross section of the jet conduit 16 are larger than those of the conventional product, thereby increasing the volume of the entire jet conduit. Specifically, the jet conduit 16 has a volume (about 1 liter) of more than 1 / 3 of the volume (about 3 liters) of the water storage tank 4. In addition, the jet conduit 16 has a volume (about 1 liter) of more than half the amount of water (about 2 liters) of the washing water discharged from the water storage tank 4 in one washing. As a result, more washing water can be retained in the jet conduit 16 than in the conventional product, and the jet water can be discharged by the water head pressure of the retained washing water.

[0118] It should be noted that the present invention is not limited to toilets in which the entire jet conduit 16 is arranged below the top 8d of the drainage trap pipe 8, and the present invention includes toilets in which a portion of the jet conduit 16 is arranged above the top 8d as in the present embodiment.

[0119] Furthermore, if Figure 4 As shown in FIG. 1 , the bottom surface 16d of the upstream flow path 16a on the downstream side is located below the upper end 8e of the inlet portion 8a of the drainage bend pipe 8. Furthermore, the bottom surface 16d is located on the front side of the top portion 8d of the drainage bend pipe 8 and below the upper end 8e of the inlet portion 8a of the drainage bend pipe 8 (see FIG. 1 ). Figure 2 Thus, even if the water seal water level drops and the siphon action is about to end, the washing water continues to stay on the downstream side of the upstream flow path 16a, so that the siphon action can be continued.

[0120] Next, the center O1 of the jet spout 14 is arranged at a height position substantially the same as the center O2 of the inlet 8a of the drain trap pipe 8. Thus, the washing water spouted from the jet spout 14 easily flows into the inlet 8a of the drain trap pipe 8. Furthermore, the center O1 of the jet spout 14 is located at the lowest position in the central axis X of the flow path cross section of the jet water conduit 16 (refer to Figure 2 Thus, since the center O1 of the jet water spouting port 14 is located at the lowest position, washing water can be spouted from the jet water spouting port 14 for a long time, thereby delaying the entry of air from the jet water spouting port 14 into the jet water conduit 16 .

[0121] Furthermore, the upper end 14a of the jet water spouting port 14 is arranged below the upper end 8e of the inlet portion 8a of the drain trap pipe 8. Thus, the flushing water is spouted from the jet water spouting port 14 for a long time, so that the siphon effect can be sustained. Figure 2 As shown in the figure, more than half of the jet conduit 16 is located above the upper end 8e of the inlet portion 8a of the drain trap pipe 8. As a result, almost all of the washing water in the jet conduit can be discharged before the siphon effect ends. In addition, the upper surfaces 16g, 16h, 16i and the bottom surface 16d of the jet conduit 16 are gradually inclined downward from the upstream side to the downstream side. As a result, the washing water easily flows to the jet spout 14.

[0122] Next, through Figure 1 , Figure 4 to Figure 7G , the downstream portion of the jet water conduit 16 of the flush toilet of the first embodiment will be described in detail.

[0123] Figure 5 yes Figure 1 1 is a top cross-sectional view of a downstream portion of a jet conduit of a flush toilet according to a first embodiment of the present invention, Figure 6 is along Figure 2 The top cross-sectional view when observing along the VI-VI line, Figure 7A to Figure 7G Yes means Figure 5 and Figure 6 FIG. 1 is a diagram showing flow path cross sections A to G of a jet conduit of a flush toilet according to the first embodiment.

[0124] First, if Figure 5 As shown in FIG. 1 , the downstream flow path 16c and the curved flow path 16b of the jet water conduit 16 are formed with a curved portion 40, which is eccentric to the opposite side of the upstream flow path 16a relative to the central axis of the jet water spout 14 (the center O1 of the jet water spout 14) in a plan view. The eccentric distance D between the center O1 of the jet water spout 14 and the center O3 of the flow path cross section at the downstream end of the curved flow path 16b is set to about 9 mm. In addition, as shown in FIG. Figure 6 As shown, the center O1 of the jet water spouting port 14 is set to be coaxial with the center O4 of the flow path cross section of the buffer portion 50 and the center O2 of the inlet portion 8a of the drainage trap pipe 8.

[0125] The flow velocity distribution of the washing water ejected from the jet water spouting port 14 is adjusted by the curved portion 40 so that the flow velocity distribution in the flow path cross section of the jet water spouting port 14 is substantially uniform. In addition, the flow velocity distribution of the washing water ejected from the jet water spouting port 14 is adjusted by the curved portion 40 so that the washing water ejected from the jet water spouting port 14 flows toward the center O2 of the inlet portion 8a of the drain trap pipe 8.

[0126] Next, if Figure 1As shown, in a top view, the curved portion 40 is arranged in the inner area of ​​the water surface W (in the water seal area), and the entire curved flow path 16b is also arranged in the inner area of ​​the water surface W. As a result, the curved portion 40 and the curved flow path 16b of the jet water conduit 16 are compactly formed. In addition, since the curved portion 40 and the curved flow path 16b are arranged in the inner area of ​​the water surface W, the curved portion 40 and the curved flow path 16b can be always in a full water state, and air can be suppressed from being retained in the curved portion 40 and the curved flow path 16b.

[0127] Furthermore, if Figure 5 As shown, a rectifying portion 42 is formed in the downstream flow path 16c on the downstream side of the curved portion 40, and the rectifying portion 42 extends rearward toward the jet water spouting port 14. The rectifying portion 42 extends approximately linearly with a length of about 25 mm toward the jet water spouting port 14. Thus, the washing water flowing through the curved portion 40 can be rectified.

[0128] Next, the inner peripheral surface of the curved flow path 16b is formed such that the radius of curvature on the upstream side is formed with r1, and the radius of curvature on the downstream side is formed with r2, and the radius of curvature r2 on the downstream side is smaller than the radius of curvature r1 on the upstream side. In addition, the outer peripheral surface of the curved flow path 16b is formed such that the radius of curvature on the upstream side is formed with R1, and the radius of curvature on the downstream side is formed with R2, and the radius of curvature R2 on the downstream side is larger than the radius of curvature R1 on the upstream side.

[0129] As a result, the washing water F1 flowing through the inner peripheral surface of the curved flow path 16b is separated from the inner peripheral surface by the centrifugal force, and water S is inevitably generated near the inner peripheral surface on the downstream side of the curved flow path 16b (see Figure 5 ). Therefore, even if the curvature radius of the inner peripheral surface on the downstream side of the curved flow path 16b is reduced, the influence of energy loss is small. Therefore, since the inner peripheral surface on the downstream side of the curved flow path 16b, which is the portion where the accumulated water S is generated, is formed with a relatively small curvature radius r2, it is possible to make the curved flow path 16b compact while suppressing energy loss of the washing water flowing in the curved flow path 16b.

[0130] In addition, the washing water F2 flowing through the outer peripheral surface of the curved flow path 16b is affected by the centrifugal force and has a relatively larger flow rate than the washing water F1. Since the outer peripheral surface of the downstream side of the curved flow path 16b through which relatively more washing water F2 flows is formed with a relatively large curvature radius R2, the washing water flows through the outer peripheral surface while maintaining the flow velocity, and the separation of the water flow on the outer peripheral surface of the curved flow path 16b can be suppressed.

[0131] Furthermore, the jet conduit 16 is formed by casting (secondary molding), wherein the space between the upstream flow path 16a and the rectifying portion 42 of the downstream flow path 16c is formed as a solid molded body. Thus, the space between the upstream flow path 16a and the rectifying portion 42 of the downstream flow path 16c can be made thinner, thereby making the jet conduit 16 compact.

[0132] like Figure 2 and Figure 7A to Figure 7G As shown, the bottom surface 16d of the upstream flow channel 16a of the jet water conduit 16 is formed to be inclined downward from the upstream side to the downstream side, and the bottom surface 16e of the curved flow channel 16b and the bottom surface 16f of the downstream flow channel 16c are formed to be substantially horizontal at substantially the same height position.

[0133] like Figure 2 As shown, the upper surface 16g of the upstream flow channel 16a of the jet conduit 16, the upper surface 16h of the curved flow channel 16b, and the upper surface 16i of the downstream flow channel 16c are formed to be inclined downward from the upstream side to the downstream side.

[0134] like Figure 7B to Figure 7D As shown in FIG. 1 , the upper surface 16h of the curved flow path 16b is higher on the outer peripheral side than on the inner peripheral side. As a result, in the flow path cross-sectional area of ​​the curved flow path 16b, the area on the outer peripheral side can be formed larger than the area on the inner peripheral side, thereby preventing the washing water F2 flowing through the outer peripheral surface of the curved flow path 16b from escaping from the outer peripheral surface of the curved flow path 16b. In addition, as shown in FIG. Figure 7F and Figure 7G As shown in FIG. 1 , the height dimension of the rectifying portion 42 of the downstream flow path 16 c is formed to be substantially the same on the inner peripheral surface side and the outer peripheral surface side. This can further rectify the flow of washing water.

[0135] like Figure 7B to Figure 7G As shown, the cross-section of the curved flow path 16b and the downstream flow path 16c gradually increases in horizontal width and decreases in vertical width from the upstream side to the downstream side. Thus, a large flow of water can be ejected from the jet spout 14 in a flat shape.

[0136] Next, through Figure 8A to Figure 8F , the flushing action of the flush toilet 1 according to the first embodiment of the present invention will be described.

[0137] Figure 8A to Figure 8F It is a diagram for explaining the flushing action of the flush toilet according to the first embodiment of the present invention.

[0138] Fig. 8AThe standby state is shown, and the washing water is accumulated in the bowl 6 to the water level of the water cover W, and the washing water is also accumulated in the jet water conduit 16 to the same height as the water cover W. At this time, air is retained in the area A of a part of the upstream flow path 16a located just below the water storage tank 4.

[0139] Next, if Figure 8B As shown, the water supply device is driven (the electromagnetic valve on the inner rim is opened), the inner rim starts to discharge water, and the water level of the washing water gradually rises in the bowl 6. As a result, the water level of the washing water in the jet water conduit 16 gradually rises, and the air retained in the area A of a part of the upstream side flow path 16a is discharged from the overflow pipe 30, and then the jet water conduit 16 reaches a full water state.

[0140] Afterwards, if Figure 8C As shown, during the process of the inner edge water spouting, the drainage device 26 is driven (the drainage valve 32 is opened) and the jet water spouting starts. At this time, the water head pressure of the washing water stored in the water storage tank 4 is applied to the washing water retained in the jet water conduit 16, so that the washing water of the first flow rate is spouted from the jet water spouting port 14. The first flow rate is a large flow rate, and the drainage elbow pipe 8 reaches a full water state through the jet water spouting of the first flow rate, so that the siphon effect is started. The jet water spouting of the first flow rate continues for a predetermined time, and the waste is discharged by the strong siphon effect.

[0141] Next, if Fig.8D As shown in FIG. 1 , during the process of the inner edge water spouting, the drain device 26 stops (the drain valve 32 is closed). Even if the drain device 26 stops, since the volume of the entire jet water conduit 16 is large, a large amount of washing water is retained in the jet water conduit 16, and flows in the jet water conduit 16 while receiving the head pressure of the accumulated washing water, so that the washing water of the second flow rate is spouted from the jet water spouting port 14. Although the second flow rate is smaller than the first flow rate, it is a flow rate sufficient to continue the siphon action. The jet water spouting of the second flow rate continues for a predetermined time, so that the siphon action continues.

[0142] Afterwards, if Fig. 8E As shown, the water seal is discharged together with the dirt by the siphon effect, so that the water level of the washing water in the bowl 6 drops, and air enters from the upper end of the inlet 8a of the drain elbow pipe 8, and the siphon effect ends. Among them, since the jet water conduit 16 is formed to allow the washing water to continue to be retained, the entry of air can be delayed, and the end of the siphon effect is further delayed. The inner edge water spouting continues, and when the washing water accumulates in the bowl 6 to the water level of the water surface W, the washing ends. At this time, the washing water is also accumulated in the jet water conduit 16 to the same height as the water surface W.

[0143] Next, if Fig.8FAs shown in FIG. 1 , the water supply device is driven (the electromagnetic valve on the water tank side is opened) to start water supply to the water tank. If the water level of the washing water in the water storage tank 4 rises and the float switch becomes the water stop level (full water level), the water supply device is stopped (the electromagnetic valve on the water tank side is closed). Next, as shown in FIG. Fig. 8A As shown, it becomes the original standby state.

[0144] Next, through Fig.9A and Fig. 9B , the details of the jet water spouting form of the flush toilet according to the first embodiment of the present invention are described.

[0145] Fig.9A The diagram is a diagram showing the instantaneous flow rate of flush water ejected from the jet spout and the instantaneous flow rate of flush water flowing into the inlet of the drainage trap pipe during the large flush of the flush toilet according to the first embodiment of the present invention. Fig. 9B It is a line graph showing the instantaneous flow rate of flush water spouted from the jet spouting port and the instantaneous flow rate of flush water flowing into the inlet portion of the drainage trap pipe during small flushing of the flush toilet according to the first embodiment of the present invention. Fig.9A and Fig. 9B The dotted line represents the instantaneous flow rate of the washing water ejected from the jet water spouting port 14. Fig.9A and Fig. 9B The solid line indicates the instantaneous flow rate of the washing water flowing into the inlet portion 8 a of the drainage trap pipe 8 .

[0146] In the present embodiment, the amount of washing water spouted from the jet water spouting port 14 is approximately 2 liters in the case of large washing and approximately 1.5 liters in the case of small washing.

[0147] In the Great Cleansing, Fig.9A As shown, first, if the drainage device 26 is driven, the jet water spouting starts, and the cleaning water of the first flow rate Q1 is spouted from the jet water spouting port 14. At this time, the instantaneous flow rate of the cleaning water spouted from the jet water spouting port 14 increases sharply (increase rate A) just after the start, and immediately reaches the maximum instantaneous flow rate Q1max. As a result, the siphon action is quickly started (time T1). After that, the instantaneous flow rate decreases slightly from the maximum instantaneous flow rate Q1max and then becomes approximately constant. In addition, since in addition to the cleaning water spouted from the jet water spouting port 14 and the inner edge water spouting port 10, the water seal is also sucked into the drainage bend pipe 8 by the siphon action, the instantaneous flow rate of the cleaning water flowing into the inlet 8a of the drainage bend pipe 8 increases sharply. As a result, a strong siphon action can be started and continued.

[0148] Next, if Fig.9AAs shown in FIG. 1 , after the drainage device 26 stops (at time T2), when the spouting of the first flow rate Q1 ends, the washing water of the second flow rate Q2 is spouted from the jet spouting port 14. At this time, the instantaneous flow rate of the washing water spouted from the jet spouting port 14 increases slowly (increase rate B) to the maximum instantaneous flow rate Q2max compared to the increase rate A of the first flow rate Q1. Thus, the turbulence of the washing water spouted from the jet spouting port 14 can be suppressed.

[0149] In addition, the maximum instantaneous flow rate Q2max of the second flow rate Q2 is set to be smaller than the maximum instantaneous flow rate Q1max of the first flow rate Q1. Thus, the siphon effect can be continued by the second flow rate Q2 which is smaller than the first flow rate Q1, and water saving can be achieved while improving the sewage discharge performance. In addition, since the water seal is also sucked into the drainage bend pipe 8 by the siphon effect in addition to the washing water spouted from the jet spouting port 14 and the inner edge spouting port 10, the instantaneous flow rate of the washing water flowing into the inlet portion 8a of the drainage bend pipe 8 can be maintained at a large instantaneous flow rate.

[0150] In the small wash, such as Fig. 9B As shown, first, if the drainage device 26 is driven, the jet water spouting starts, and the washing water of the first flow rate q1 is spouted from the jet water spouting port 14. At this time, the instantaneous flow rate of the washing water spouted from the jet water spouting port 14 increases sharply (increase rate a) just after the start, and immediately reaches the maximum instantaneous flow rate q1max. As a result, the siphon effect is quickly started (time t1). After that, the instantaneous flow rate decreases slightly from the maximum instantaneous flow rate q1max, and then, if the drainage device 26 is stopped (time t2), it decreases sharply. In addition, since in addition to the washing water spouted from the jet water spouting port 14 and the inner edge water spouting port 10, the water seal is also sucked into the drainage bend pipe 8 by the siphon effect, the instantaneous flow rate of the washing water flowing into the inlet 8a of the drainage bend pipe 8 increases sharply. As a result, a strong siphon effect can be started and continued.

[0151] Next, if Fig. 9B As shown in FIG. 1 , after the drainage device 26 stops (at time t2), the water spouting of the first flow rate q1 ends, and the washing water of the second flow rate q2 is spouted from the jet water spouting port 14. At this time, the instantaneous flow rate of the washing water spouted from the jet water spouting port 14 increases slowly (increase rate b) to the maximum instantaneous flow rate q2max compared to the increase rate a of the first flow rate q1. Thus, the turbulence of the washing water spouted from the jet water spouting port 14 can be suppressed.

[0152] In addition, the maximum instantaneous flow rate q2max of the second flow rate q2 is set to be smaller than the maximum instantaneous flow rate q1max of the first flow rate q1. Thus, the siphon effect can be continued by the second flow rate q2 which is smaller than the first flow rate q1, and water saving can be achieved while improving the sewage discharge performance. In addition, since the water seal is also sucked into the drainage bend pipe 8 by the siphon effect in addition to the washing water spouted from the jet spouting port 14 and the inner edge spouting port 10, the instantaneous flow rate of the washing water flowing into the inlet portion 8a of the drainage bend pipe 8 can be maintained at a large instantaneous flow rate.

[0153] If we compare the big wash and the small wash, then Fig.9A and Fig. 9B As shown, the flushing water volume of the big wash or the small wash is switched by adjusting the jetting time of the first flow rate Q1 of the big wash and the jetting time of the first flow rate q1 of the small wash.

[0154] Hereinafter, the effects of the above-mentioned first embodiment will be described.

[0155] In the flush toilet of the first embodiment of the present invention, the drainage device 26 is driven, and the flush water in the water storage tank 4 flows into the jet water conduit 16, so that the flush water of the first flow rate Q1, q1 is discharged from the jet water spouting port 14. After the spouting of the first flow rate Q1, q1 is completed, the flush water retained in the jet water conduit 16 flows toward the jet water spouting port 14, so that the flush water of the second flow rate Q2, q2 is discharged from the jet water spouting port 14. Therefore, the siphon effect can be generated by the first flow rate Q1, q1, and the siphon effect can be continued by the second flow rate Q2, q2. Therefore, even if the jet siphon type flush toilet 1 in which the jet water conduit 16 is arranged below the top 8d of the drainage bend pipe 8, the siphon effect sufficient to discharge waste can be generated and continued, thereby improving the sewage discharge performance.

[0156] In addition, in the flush toilet of the first embodiment of the present invention, the maximum instantaneous flow rates Q2max and q2max of the second flow rates Q2 and q2 are set to be smaller than the maximum instantaneous flow rates Q1max and q1max of the first flow rates Q1 and q1, so that the siphon effect can be continued by the second flow rates Q2 and q2 having smaller maximum instantaneous flow rates. Thus, it is possible to improve the sewage discharge performance while achieving water saving.

[0157] In the flush toilet of the first embodiment of the present invention, the instantaneous flow rate of the second flow rate Q2, q2 is set to increase slowly (increase rate B, b) to the maximum instantaneous flow rate Q2max, q2max compared with the instantaneous flow rate of the first flow rate Q1, q1, so that compared with the case where the instantaneous flow rate is increased sharply, it is possible to suppress the turbulence of the flush water spouted from the jet spouting port 14. As a result, the flush water can flow smoothly into the drainage bend pipe 8, so that the siphon effect can continue.

[0158] Furthermore, in the flush toilet according to the first embodiment of the present invention, the flush water volume for large flush and small flush is switched by adjusting the jet spouting time of the first flow rates Q1 and q1, so the flush water volume can be switched accurately.

[0159] In the flush toilet of the first embodiment of the present invention, after the drainage device 26 stops, the cleaning water of the second flow rate Q2, q2 is discharged from the jet water spouting port 14, so that the cleaning water retained in the jet water conduit 16 can be discharged from the jet water spouting port 14 at the second flow rate Q2, q2.

[0160] Furthermore, in the flush toilet of the first embodiment of the present invention, the upstream flow path 16a is arranged substantially parallel to the drainage bend pipe 8, and the bottom surface 16d on the downstream side of the upstream flow path 16a is located below the upper end 8e of the inlet portion 8a of the drainage bend pipe 8. Therefore, even if the water seal water level drops and the siphon effect is about to end, the siphon effect can be continued because the flush water continues to remain on the downstream side of the upstream flow path 16a.

[0161] In the flush toilet of the first embodiment of the present invention, in the area further forward than the top 8d of the drainage bend pipe 8, the bottom surface 16d of the upstream flow path 16a is located lower than the upper end 8e of the inlet portion 8a of the drainage bend pipe 8. Therefore, even if the water seal water level drops and the siphon effect is about to end, the siphon effect can be continued because the flush water continues to remain in the upstream flow path 16a.

[0162] In the flush toilet according to the first embodiment of the present invention, the center O1 of the jet spouting port 14 is located at the lowest position on the central axis X of the jet conduit 16 . Therefore, flush water can be spouted from the jet spouting port 14 for a long time.

[0163] In the flush toilet of the first embodiment of the present invention, since the water tank 4 is provided with an overflow pipe 30 for discharging water overflowing from the water tank 4, and the overflow pipe 30 is arranged at the same position as the drainage device 26 or further rearward than the drainage device 26, air replacement can be performed via the overflow pipe 30 on the rear side of the jet water conduit 16, and the flow of flush water toward the jet water outlet 14 can be prevented from being obstructed by air replacement.

[0164] In the flush toilet of the first embodiment of the present invention, the jet water conduit 16 has a volume of 1 / 3 or more of the water storage tank 4, so that a large amount of flush water can be retained in the jet water conduit 16. Thus, even if the water storage tank 4 is miniaturized, jet water spouting sufficient to discharge waste can be performed.

[0165] In the flush toilet of the first embodiment of the present invention, after the drainage device 26 stops, flush water is spouted from the inner rim water spouting port 10. Therefore, even if the drainage device 26 stops, the flush water from the inner rim water spouting port 10 will merge into the flush water spouted from the jet water spouting port 14, thereby further continuing the siphon action.

[0166] Furthermore, in the flush toilet of the first embodiment of the present invention, the downstream flow path 16c of the jet water conduit 16 is formed with a curved portion 40, and the curved portion 40 is eccentric to the opposite side of the upstream flow path with respect to the central axis of the jet water spouting port 14, so that the flow velocity distribution of the washing water spouted from the jet water spouting port 14 can be made substantially uniform. In addition, since the curved portion 40 is arranged in the water seal area, the jet water conduit 16 can be made compact. Thus, even if the jet water conduit 16 is made compact, jet water spouting sufficient to discharge waste can be performed, and waste discharge performance can be improved.

[0167] In the flush toilet of the first embodiment of the present invention, since the curved flow path 16b is arranged in the water seal area, the jet water conduit 16 can be made compact. In addition, since the curved flow path 16b is arranged in the water seal area, the curved flow path 16b can be always in a full water state. Thus, air can be suppressed from being trapped in the curved flow path 16b, and the flow velocity distribution of the flush water spouted from the jet water spouting port 14 can be made substantially uniform.

[0168] Furthermore, in the flush toilet of the first embodiment of the present invention, a rectifying portion 42 is formed in the downstream flow path 16c which is further downstream than the bend 40, and the rectifying portion 42 extends linearly toward the jet water spouting port 14, thereby rectifying the flush water flowing through the bend 40, and making the flow velocity distribution of the flush water spouted from the jet water spouting port 14 approximately uniform.

[0169] In the flush toilet of the first embodiment of the present invention, the jet water conduit 16 is formed by casting, wherein the rectifying portion 42 between the upstream side flow path 16a and the downstream side flow path 16c is formed as a solid molded body, thereby making it possible to make the rectifying portion 42 between the upstream side flow path 16a and the downstream side flow path 16c thinner, thereby making the jet water conduit 16 compact.

[0170] In addition, in the flush toilet of the first embodiment of the present invention, the bottom surface 16e of the curved flow path 16b is formed to be substantially horizontal, and the upper surface 16h of the curved flow path 16b is inclined downward from the upstream side to the downstream side, and the height position of the upper surface 16h of the curved flow path 16b on the outer peripheral side is higher than the height position on the inner peripheral side. Therefore, in the flow path cross-sectional area of ​​the curved flow path 16b, the area on the outer peripheral side can be made larger than the area on the inner peripheral side, thereby suppressing the separation of the water flow on the outer peripheral side where relatively more washing water flows. As a result, the flow velocity distribution of the washing water ejected from the jet spout 14 can be made substantially uniform.

[0171] In the flush toilet of the first embodiment of the present invention, the jet water conduit 16 and / or the buffer portion 50 are configured so that the flush water spouted from the jet water spouting port 14 flows toward the center O2 of the inlet portion 8a of the drainage bend pipe 8. Therefore, even if the jet water conduit 16 is made compact, flush water can be spouted from the jet water spouting port toward the center O2 of the inlet portion 8a of the drainage bend pipe 8. Therefore, while making the jet water conduit 16 compact, it is possible to perform jet water spouting sufficient to discharge waste, thereby improving waste discharge performance.

[0172] In addition, in the flush toilet of the first embodiment of the present invention, when viewed from a top view, the curvature radius r2 of the inner circumferential surface of the curved flow path 16b on the downstream side is smaller than the curvature radius r1 on the upstream side, and the inner circumferential surface of the downstream side of the curved flow path 16b, which is the part where water accumulates, is formed with a relatively small curvature radius r2. Therefore, it is possible to suppress the generation of energy loss and make the curved flow path 16b compact.

[0173] In the flush toilet of the first embodiment of the present invention, in a top view, the curvature radius R2 of the outer peripheral surface of the curved flow path 16b on the downstream side is larger than the curvature radius R1 on the upstream side. The outer peripheral surface on the downstream side of the curved flow path 16b, through which relatively more flush water flows, is formed with a relatively large curvature radius R2. Therefore, the flow velocity can be maintained and the separation of water flow on the outer peripheral surface of the curved flow path 16b can be suppressed.

[0174] In addition, in the flush toilet of the first embodiment of the present invention, the bottom surface 16e of the curved flow path 16b is formed to be approximately horizontal, and the upper surface 16h of the curved flow path 16b is inclined downward from the upstream side to the downstream side. The height position of the upper surface 16h of the curved flow path 16b on the outer peripheral surface side is higher than the height position on the inner peripheral surface side. Therefore, in the flow path cross-sectional area of ​​the curved flow path 16b, the area on the outer peripheral surface side can be made larger than the area on the inner peripheral surface side, thereby suppressing the separation of water flow on the outer peripheral surface side through which relatively more flush water flows.

[0175] In the flush toilet of the first embodiment of the present invention, since the curved flow path 16b is arranged in the water seal area, the jet water conduit 16 can be made compact. In addition, the curved flow path 16b can be always filled with water, thereby preventing air from stagnating in the curved flow path 16b.

[0176] Next, through Figure 10 to Figure 13 , a flush toilet 100 according to a second embodiment of the present invention will be described.

[0177] The basic structure is the same as that of the flush toilet 1 according to the first embodiment of the present invention described above, except for the shapes of the downstream side of the jet water conduit and the buffer portion.

[0178] Hereinafter, only the differences from the flush toilet 1 of the first embodiment will be described, and descriptions of the same structures, functions, and effects will be omitted.

[0179] Fig.10 2 is a side sectional view of a flush toilet according to a second embodiment of the present invention, which is different from the first embodiment. Figure 2 correspond. Fig.11 Yes Fig.10 The enlarged partial view of the jet water spouting port of the flush toilet according to the second embodiment of the present invention is shown in FIG. Fig.12 is along Fig.10 The top cross-sectional view when observing along the XII-XII line, Fig.13 This is a graph comparing the kinetic energy accumulation from the start of flushing to the start of siphon action of the second embodiment of the present invention with that of existing products. Figure 10 to Figure 13 In the flush toilet 100 according to the second embodiment of the present invention shown in the figure, the same reference numerals are used for the same parts as those of the flush toilet 1 according to the first embodiment of the present invention described above.

[0180] Fig.10 and Fig.11 As shown, the jet water spouting port 114 is arranged so that its lower end 114b is closer to the inlet portion 8a of the drain bend pipe 8 than the upper end 114a. The distance D1 in the front-to-back direction from the lower end 114b of the jet water spouting port 114 to the inlet portion 8a of the drain bend pipe 8 is shorter than the distance D2 in the front-to-back direction from the upper end 114a of the jet water spouting port 114 to the inlet portion 8a of the drain bend pipe 8. As such, the jet water spouting port 114 is inclined downward toward the inlet portion 8a of the drain bend pipe 8 in the side cross-sectional view. As a result, since the area where the buffer portion 150 is formed is reduced, the energy loss incurred when passing through the buffer portion 150 is reduced, and the washing water spouted from the jet water spouting port 114 flows strongly into the drain bend pipe 8.

[0181] like Fig.12 As shown, the jet water conduit 116 includes an upstream flow path 116a extending forward from the water storage tank 4, a curved flow path 116b curved from the upstream flow path 116a, and a downstream flow path 116c extending rearward from the curved flow path 116b and connected to the jet water spouting port 14. A buffer portion 150 is provided between the jet water spouting port 114 and the inlet portion 8a of the drain bend pipe 8, and the jet water conduit 116 communicates with the drain bend pipe 8 via the buffer portion 150.

[0182] like Fig.12 As shown in FIG. 1 , the center O101 of the jet spouting port 114 is arranged to be eccentric to the upstream flow path 116a side by an eccentric distance D3 relative to the center O104 of the flow path cross section of the buffer portion 150 and the center O2 of the inlet portion 8a of the drain bend pipe 8. The jet conduit 116 is set so that the position P of the main flow F3 of the washing water passing through the jet spouting port 114 is substantially coaxial with the center O104 of the flow path cross section of the buffer portion 150 and the center O2 of the inlet portion 8a of the drain bend pipe 8 in a top view. Thus, washing water is spouted from the jet spouting port 114 toward the center O2 of the inlet portion 8a of the drain bend pipe 8.

[0183] Next, the upstream end portion 150a located at the upstream end of the buffer portion 150 is formed such that, in a plan view, the curvature radius of the inner peripheral surface side is formed at r101, and the curvature radius of the outer peripheral surface side is formed at R101, and the curvature radius r101 of the inner peripheral surface side is smaller than the curvature radius R101 of the outer peripheral surface side. Thus, the washing water ejected from the jet water spouting port 114 flows close to the inner peripheral surface side having a relatively small curvature radius r101, and thus the washing water ejected from the jet water spouting port 114 flows toward the center O2 of the inlet portion 8a of the drainage trap pipe 8.

[0184] In addition, if Fig.12 As shown, the jet water conduit 116 is connected to the buffer 150 via a connection portion 152. In a plan view, the curvature radius of the inner peripheral surface side of the connection portion 152 is formed as r102, and the curvature radius of the outer peripheral surface side is formed as R102, and the curvature radius r102 of the inner peripheral surface side and the curvature radius R102 of the outer peripheral surface side are formed to be substantially the same size. In addition, in a plan view, the curvature radius r102 of the inner peripheral surface side of the connection portion 152 and the curvature radius R102 of the outer peripheral surface side are formed to be smaller than the curvature radius r101 of the inner peripheral surface side of the upstream end 150a of the buffer 150. As a result, it is possible to suppress the separation of the water flow when water is ejected from the jet water spouting port 114.

[0185] Next, through Fig.13 The kinetic energy of flush water spouted from the jet water spouting port 114 of the flush toilet 100 according to the second embodiment of the present invention when flowing into the drainage trap pipe 8 will be described.

[0186] Fig.13 This is a graph comparing the amount of kinetic energy accumulated from the start of flushing to the start of siphon action of the flush toilet 100 according to the second embodiment of the present invention with that of a conventional product. Fig.13 The kinetic energy of the washing water shown is measured by fluid analysis, and is shown in FIG. Fig.12 The accumulated kinetic energy of (1) the position of the jet water spouting port 114, (2) the middle position of the buffer portion 150 in the front-rear direction, and (3) the inlet portion 8a of the drainage trap pipe 8 are calculated.

[0187] like Fig.13 As shown, the kinetic energy of each part in the existing product is maximum at the position of the jet water spouting port 114, is smaller at the middle position of the buffer portion 150 than at the position of the jet water spouting port 114, and is smaller at the inlet portion 8a of the drainage bend pipe 8 than at the position of the jet water spouting port 114 and the middle position of the buffer portion 150.

[0188] like Fig.13 As shown, the kinetic energy of each part of the flush toilet 100 of the second embodiment of the present invention is smaller than that of the existing product at the position of the jet spout 114, but is larger than that of the existing product at the middle position of the buffer 150 and the inlet 8a of the drainage bend pipe 8. It can be seen that the flush toilet 100 of the second embodiment of the present invention suppresses the flush water spouted from the jet spout 114 from suffering energy loss and flows into the drainage bend pipe 8.

[0189] Hereinafter, the effects of the above-mentioned second embodiment will be described.

[0190] First, in the flush toilet of the second embodiment of the present invention, the jet water conduit 116 and / or the buffer portion 150 are configured so that the flush water ejected from the jet water spouting port 114 flows toward the center O2 of the inlet portion 8a of the drainage bend pipe 8. Therefore, even if the jet water conduit 116 is made compact, flush water can be ejected from the jet water spouting port toward the center O2 of the inlet portion 8a of the drainage bend pipe 8. Therefore, while making the jet water conduit 116 compact, it is possible to perform jet water spouting sufficient to discharge waste, thereby improving waste discharge performance.

[0191] In addition, in the flush toilet of the second embodiment of the present invention, the jet water conduit 116 is constructed so that, in a top view, the position P of the mainstream F3 of the flush water passing through the jet water spouting port 114 is approximately coaxial with the center O104 of the flow path cross section of the buffer section 150 and the center O2 of the drainage bend pipe 8, so that flush water can be ejected from the jet water spouting port 114 toward the center O2 of the inlet portion 8a of the drainage bend pipe 8.

[0192] In the flush toilet of the second embodiment of the present invention, when viewed from above, the curvature radius r101 of the inner circumferential surface side of the upstream end 150a of the buffer portion 150 is smaller than the curvature radius R101 of the outer circumferential surface side. Therefore, the cleaning water ejected from the jet water spouting port 114 flows close to the inner circumferential surface side with the relatively small curvature radius r101, thereby enabling the cleaning water ejected from the jet water spouting port 114 to flow toward the center O2 of the inlet portion 8a of the drainage bend pipe 8.

[0193] In addition, in the flush toilet of the second embodiment of the present invention, the curvature radius r102, R102 of the connecting portion 152 connecting the jet water conduit 116 and the buffer portion 150 is smaller than the curvature radius r101 of the inner circumferential side of the upstream end 150a of the buffer portion 150, thereby being able to suppress the separation of the water flow when water is sprayed from the jet water spouting port 114.

[0194] In the flush toilet of the second embodiment of the present invention, the distance D1 from the lower end 114b of the jet water spouting port 114 to the entrance portion 8a of the drainage bend pipe 8 is shorter than the distance D2 from the upper end 114a of the jet water spouting port 114 to the entrance portion 8a of the drainage bend pipe 8. Therefore, the area where the buffer portion 150 is formed can be reduced, thereby reducing the energy loss when water is spouted from the jet water spouting port 114.

[0195] Next, according to Figure 14 to Figure 16B , the jet water conduit 216 of the flush toilet 200 according to the third embodiment of the present invention will be described.

[0196] Fig.14 1 is a top view showing a flush toilet according to a third embodiment of the present invention. Fig.15 is along Fig.14 The side cross-sectional view observed along the XV-XV line, Fig.16A 1 is a perspective view showing a jet water conduit of a flush toilet according to a third embodiment of the present invention. Fig. 16B 1 is a perspective view for explaining the positional relationship between the jet water conduit and the bowl of the flush toilet according to the third embodiment of the present invention. Figure 14 to Figure 16B In the flush toilet 200 according to the third embodiment of the present invention shown in the figure, the same reference numerals are used for the same parts as those of the flush toilet 1 according to the first embodiment of the present invention described above.

[0197] First, if Fig.14As shown, the jet water conduit 216 is formed in a U-shape as a whole, and connects the drain port 4a of the water storage tank 4 and the jet water spouting port 214, wherein the drain port 4a of the water storage tank 4 is arranged on the right side when the toilet body 202 is viewed from the front, and the jet water spouting port 214 is arranged in the center in the left-right direction. The upstream side flow path 216a of the jet water conduit 216 is substantially parallel to the drain elbow pipe 8, and extends forward from the drain port 4a of the water storage tank 4. In addition, the curved flow path 216b of the jet water conduit 216 is curved backward from the downstream end of the upstream side flow path 216a (U-turn). Furthermore, the downstream side flow path 216c of the jet water conduit 216 extends backward from the downstream end of the curved flow path 216b toward the inlet portion 8a of the drain elbow pipe 8.

[0198] Next, if Fig.15 As shown, except for the area A of a portion of the upstream flow path 216a located directly below the water storage tank 4 (the area near the drain outlet 4a of the water storage tank 4), the jet water conduit 216 is arranged below the top 8d of the drain elbow pipe 8, that is, below the water surface W. Fig. 16B As shown in FIG. 1 , the vertical width and horizontal width of the flow path cross section of the jet conduit 216 are larger than those of the conventional product, thereby increasing the volume of the entire jet conduit. Specifically, the jet conduit 216 has a volume (about 1 liter) of more than 1 / 3 of the volume (about 3 liters) of the water storage tank 4. In addition, the jet conduit 216 has a volume (about 1 liter) of more than half the amount of water (about 2 liters) of the washing water discharged from the water storage tank 4 in one washing. As a result, more washing water can be retained in the jet conduit 216 than in the conventional product, and the jet water can be discharged by the water head pressure of the retained washing water.

[0199] like Fig.15 As shown, the bottom surface 216d of the upstream flow path 216a of the jet water conduit 216 is formed to be inclined downward from the upstream side to the downstream side, and the bottom surface 216e of the curved flow path 216b and the bottom surface 216f of the downstream flow path 216c are formed to be substantially horizontal at substantially the same height position. Fig.15 As shown, the upper surface 216g of the upstream flow channel 216a of the jet water conduit 216 is located at substantially the same height as the water surface W and is formed substantially horizontally. The upper surface 216h of the curved flow channel 216b and the upper surface 216i of the downstream flow channel 216c are formed to be inclined downward from the upstream side to the downstream side.

[0200] Next, if Fig.14As shown, in a top view, the curved flow path 216b is compactly formed by bending along the outer edge of the water surface W. In addition, since the curved flow path 216b is arranged near the water surface W, the curved flow path 216b can always be in a substantially full water state, and air can be prevented from being trapped in the curved flow path 216b.

[0201] Next, if Fig.14 and Fig.16A As shown, the upstream flow path 216a of the jet conduit 216 is provided with a first air retention portion 250, and the first air retention portion 250 extends to a position higher than the upper surface 216g of the upstream flow path 216a. Therefore, when the washing water flows through the jet conduit 216, the air retained in the jet conduit 216 or / and the air flowing into the jet conduit 216 from the overflow pipe 30 is pressed into the first air retention portion 250.

[0202] The first air retention portion 250 includes: an upstream wall surface 250a; a downstream wall surface 250b; and an upper end 250c, which is located between the upstream wall surface 250a and the downstream wall surface 250b, and the first air retention portion 250 is formed into a tapered shape toward the upper end 250c. Thus, the air flowing into the first air retention portion 250 can be concentrated at the top. In addition, the inclination angle of the upstream wall surface 250a relative to the vertical line passing through the upper end 250c is smaller than the inclination angle of the downstream wall surface 250b (close to the vertical state). Thus, it is possible to prevent the washing water flowing horizontally in the upstream side flow path 216a from flowing into the first air retention portion 250 too much, thereby hindering the flow of washing water to the jet water spouting port 214.

[0203] Next, if Fig.14 and Fig. 16B As shown, the first air retention portion 250 is formed along the bowl 6. Thus, the dead space on the inner side of the bowl 6 can be effectively utilized, and the entire toilet can be made compact. The upper end 250c of the first air retention portion 250 is located above the water surface W. Thus, air can be reliably retained in the first air retention portion 250.

[0204] like Fig.14 and Fig.16A As shown, the curved flow path 216b of the jet water conduit 216 is provided with a second air retention portion 252, and the second air retention portion 252 extends to a position higher than the upper surface 216h of the curved flow path 216b. Therefore, when the washing water flows through the jet water conduit 216, the air that is not pressed into the first air retention portion 250 or / and the air that flows out of the first air retention portion 250 is pressed into the second air retention portion 252.

[0205] The second air retention portion 252 includes: an upstream side wall surface 252a; a downstream side wall surface 252b; and an upper end 252c, which is located between the upstream side wall surface 252a and the downstream side wall surface 252b, and the second air retention portion 252 is formed in a tapered shape toward the upper end 252c. Thus, the air flowing into the second air retention portion 252 can be concentrated at the top. In addition, the inclination angle of the upstream side wall surface 252a relative to the vertical line passing through the upper end 252c is larger than the inclination angle of the downstream side wall surface 252b (close to the horizontal state). Thus, the air that is not pressed into the first air retention portion 250 or / and the air that flows out of the first air retention portion 250 can easily flow into the second air retention portion 252.

[0206] Next, if Fig.14 and Fig. 16B As shown, the second air retention portion 252 is formed along the bowl 6. Thus, the dead space on the inner side of the bowl 6 can be effectively utilized, and the entire toilet can be made compact. The upper end 252c of the second air retention portion 252 is located at approximately the same position as the water cover W. Thus, air can be reliably retained in the second air retention portion 252.

[0207] Next, through Fig.14 , Fig.17 , Figures 18A to 18G , the downstream portion of the jet water conduit 216 of the flush toilet 200 according to the third embodiment of the present invention will be described in detail.

[0208] Fig.17 yes Fig.14 1 is a top cross-sectional view of a downstream portion of a jet conduit of a flush toilet according to a third embodiment of the present invention, Figures 18A to 18G Yes means Fig.17 FIG. 2 shows flow path cross sections A to G of a jet conduit of a flush toilet according to a third embodiment of the present invention.

[0209] First, if Fig.17 and Figure 18E to Figure 18G As shown, the downstream flow path 216c of the jet water conduit 216 is formed with a constriction portion 244, which has the smallest flow path cross-sectional area in the jet water conduit 216. The flow path cross-sectional area of ​​the constriction portion 244 gradually decreases toward the jet water spout 214 (see Figure 18E to Figure 18G ). Thus, the flow velocity of the washing water passing through the constricted portion 244 can be gradually increased and the washing water can be ejected from the jet water spouting port 214 .

[0210] like Figure 18E to Figure 18GAs shown, the horizontal width 244a of the tightening portion 244 is substantially constant, and the vertical width 244b of the tightening portion 244 gradually decreases toward the jet water spouting port 214. In addition, the bottom surface 244c of the tightening portion 244 is formed substantially horizontally, and the upper surface 244d of the tightening portion 244 is inclined downward toward the jet water spouting port 214. Thus, the washing water can be guided downward while suppressing the pressure loss through the upper surface 244d.

[0211] Furthermore, the constricted portion 244 extends linearly toward the jet water spouting port 214. Thus, the washing water passing through the constricted portion 244 is rectified, and pressure loss due to the bend in the flow path can be suppressed.

[0212] Next, if Fig.17 and Figures 18B to 18D As shown, a cross-sectional area fixed portion 246 having a constant cross-sectional area of ​​the flow path is formed in the curved flow path 216b on the upstream side of the constricted portion 244. This can suppress the pressure loss caused by the narrowing of the flow path.

[0213] like Figures 18B to 18D As shown, the horizontal width 246a of the cross-sectional area fixed portion 246 gradually increases toward the jet water spouting port 214, and the vertical width 246b of the cross-sectional area fixed portion 246 gradually decreases toward the jet water spouting port 214. Thus, the washing water can be guided downward while suppressing the pressure loss caused by the narrowing of the flow path.

[0214] The bottom surface 246c of the cross-sectional area fixed portion 246 is formed substantially horizontally, and the upper surface 246d of the cross-sectional area fixed portion 246 is inclined downward toward the jet water spouting port 214. Thus, the upper surface 246d of the cross-sectional area fixed portion 246 can guide the washing water downward while suppressing pressure loss.

[0215] The cross-sectional area fixed portion 246 is formed from the bend start position (upstream end) of the curved flow path 216b to the bend end position (downstream end) of the curved flow path 216b. Thus, in the curved flow path 216b, it is possible to avoid both pressure loss due to the flow path bending and pressure loss due to the flow path narrowing.

[0216] It should be noted that in this embodiment, the cross-sectional area fixed portion 246 is formed from the upstream end to the downstream end of the curved flow path 216b, but is not limited to this. The cross-sectional area fixed portion 246 may be formed in a portion of the curved flow path 216b.

[0217] Next, if Fig.17As shown in FIG. 1 , the outer peripheral surface of the curved flow path 216b is formed such that, in a top view, the radius of curvature on the upstream side is formed as R201, and the radius of curvature on the downstream side is formed as R202, and the radius of curvature R201 on the upstream side is smaller than the radius of curvature R202 on the downstream side. Thus, the pressure loss caused by the curvature of the flow path occurs on the upstream side of the curved flow path 216b, and does not occur on the side of the tightening portion 244 (the downstream side of the curved flow path 216b) where the pressure loss occurs due to the narrowing of the flow path.

[0218] In addition, the inner peripheral surface of the curved flow path 216b is formed such that, in a top view, the radius of curvature on the upstream side is formed as r201, and the radius of curvature on the downstream side is formed as r202, and the radius of curvature r201 on the upstream side is smaller than the radius of curvature r202 on the downstream side. Thus, the pressure loss caused by the curvature of the flow path occurs on the upstream side of the curved flow path 216b, and does not occur on the side of the tightening portion 244 (the downstream side of the curved flow path 216b) where the pressure loss occurs due to the narrowing of the flow path.

[0219] Hereinafter, the effects of the third embodiment described above will be described.

[0220] In the flush toilet of the third embodiment of the present invention, the downstream flow path 216c of the jet water conduit 216 is formed with a tightening portion 244, and the tightening portion 244 has the smallest flow path cross-sectional area in the jet water conduit 216. The jet water conduit 216 on the upstream side of the tightening portion 244 is formed with a cross-sectional area fixed portion 246 having a fixed flow path cross-sectional area. Therefore, the pressure loss caused by the narrowing of the flow path can be suppressed by the cross-sectional area fixed portion 246 and the flush water can be guided to the downstream side. Thereafter, the flow velocity is increased by the tightening portion 244 and the flush water is spouted from the jet water spouting port 214. Thus, jet water spouting sufficient to discharge waste can be performed, and the sewage discharge performance can be improved.

[0221] In the flush toilet of the third embodiment of the present invention, since the flow path cross-sectional area of ​​the constriction portion 244 gradually decreases toward the jet water spouting port 214 , the flush water passing through the constriction portion 244 can gradually increase its flow velocity toward the jet water spouting port 214 .

[0222] In the flush toilet of the third embodiment of the present invention, the cross-sectional area fixed portion 246 is formed in the curved flow path 216b, thereby avoiding both pressure loss due to the bending of the flow path and pressure loss due to the narrowing of the flow path in the curved flow path 216b.

[0223] In addition, in the flush toilet of the third embodiment of the present invention, since the vertical width 246b of the cross-sectional area fixed portion 246 becomes smaller toward the jet water outlet 214 and the horizontal width 246a becomes larger, the pressure loss caused by the narrowing of the flow path can be suppressed and the flush water can be guided downward.

[0224] In the flush toilet of the third embodiment of the present invention, since the upper surface 246d of the cross-sectional area fixed portion 246 is inclined downward toward the jet water spouting port 214 and the bottom surface 246c is approximately horizontal, pressure loss can be suppressed and flush water can be guided downward through the upper surface 246d.

[0225] Furthermore, in the flush toilet of the third embodiment of the present invention, when viewed from above, the radius of curvature R1 of the outer peripheral surface of the curved flow path 216b on the upstream side is smaller than the radius of curvature R2 on the downstream side. Therefore, the pressure loss caused by the bending of the flow path can occur on the upstream side of the curved flow path 216b, rather than on the side of the tightening portion 244 (the lower side of the curved flow path 216b) where pressure loss occurs due to the contraction of the flow path.

[0226] Next, a flush toilet according to a fourth embodiment of the present invention will be described.

[0227] Fig.19A 1 is a perspective view showing a jet water conduit of a flush toilet according to a fourth embodiment of the present invention. Fig.19B It is a perspective view for explaining the positional relationship between the jet water conduit and the bowl of the flush toilet according to the fourth embodiment of the present invention.

[0228] The basic structure of the flush toilet of the fourth embodiment is the same as that of the third embodiment described above, and therefore, only the parts different from the third embodiment will be described below.

[0229] like Fig.19A and Fig.19B As shown, the upstream flow path 316a of the jet water conduit 316 is provided with a third air retention portion 354, and the third air retention portion 354 extends to a position higher than the upper surface 316g of the upstream flow path 316a. Therefore, when the washing water flows through the jet water conduit 316, the air retained in the jet water conduit 316 or / and the air flowing into the jet water conduit 316 from the overflow pipe 30 is pressed into the third air retention portion 354.

[0230] The third air retention portion 354 includes an upstream side wall surface 354a extending upward, an upper surface 354b extending forward from the upstream side wall surface 354a, and a downstream side wall surface 354c extending downward from the front end of the upper surface 354b, and the third air retention portion 354 is formed in a trapezoidal shape. Thus, the air flowing into the third air retention portion 354 can be concentrated upward, and more air can be retained. In addition, the upstream side wall surface 354a extends approximately vertically, and the downstream side wall surface 354c extends obliquely downward toward the front. Thus, it is possible to prevent the washing water flowing laterally in the upstream side flow path 316a from flowing into the third air retention portion 354 too much, thereby hindering the washing water from flowing toward the jet spouting port 314.

[0231] Next, if Fig.19B As shown, the third air retention portion 354 is formed along the bowl 306. Thus, the dead space on the inner side of the bowl 306 can be effectively utilized, and the entire toilet can be made compact. The upper surface 354b of the third air retention portion 354 is located at substantially the same position as the lower end of the edge 320. Thus, air can be reliably retained in the third air retention portion 354.

[0232] The present invention is not limited to the above-described embodiments, and various changes and modifications can be made within the scope of the technical concept described in the claims.

[0233] Explanation of symbols:

[0234] 1: Flush toilet according to the first embodiment

[0235] 2: Toilet body

[0236] 4: Water storage tank

[0237] 6: Pelvis

[0238] 8: Drainage elbow pipeline

[0239] 8a: Inlet of the drainage elbow pipe

[0240] 8b: Rising pipe of drainage elbow pipe

[0241] 8c: Downcomer pipe of drainage elbow pipe

[0242] 8d: Top of drain elbow pipe

[0243] 8e: Upper end of the inlet of the drainage elbow pipe

[0244] 10: Inner edge water spout

[0245] 14: Spouting water

[0246] 14a: Upper end of the jet water outlet

[0247] 16: Jet waterway

[0248] 16a: Upstream flow path of the jet water conduit

[0249] 16b: Curved flow path of the jet water channel

[0250] 16c: Downstream flow path of the jet water conduit

[0251] 16d: Bottom surface of the upstream flow channel of the jet water conduit

[0252] 16e: Bottom surface of the curved flow path of the jet water conduit

[0253] 16f: Bottom surface of the downstream flow channel of the jet water conduit

[0254] 16g: Upper surface of the upstream flow channel of the jet water conduit

[0255] 16h: Upper surface of the curved flow path of the jet water conduit

[0256] 16i: Upper surface of the downstream flow channel of the jet water conduit

[0257] 18: Dirt receiving surface

[0258] 20: Inner edge

[0259] 26: Drainage device

[0260] 30: Overflow pipe

[0261] 32: Drain valve

[0262] 40: Bend

[0263] 42: Rectification unit

[0264] D: Eccentric distance

[0265] F1: Clean water on the inner surface

[0266] F2: Clean water on the outer surface

[0267] O1: Center of the jet outlet

[0268] O2: Center of the inlet of the drain elbow pipe

[0269] O3: Center of the downstream end of the curved flow path

[0270] X: Center axis of the jet waterway

[0271] Q1, q1: first flow

[0272] Q1max, q1max: Maximum instantaneous flow of the first flow

[0273] A, a: Increase rate of the first flow

[0274] Q2, q2: Second flow

[0275] Q2max, q2max: Maximum instantaneous flow rate of the second flow rate

[0276] B, b: The increase rate of the second flow

[0277] R1: Curvature radius of the upstream side of the outer peripheral surface

[0278] R2: Curvature radius of the downstream side of the outer peripheral surface

[0279] r1: Curvature radius of the upstream side of the inner circumference

[0280] r2: Curvature radius of the inner surface on the downstream side

[0281] W :Water cover

[0282] 100: Flush toilet according to the second embodiment

[0283] 114: Water jet spout

[0284] 114a: Upper end of the jet water outlet

[0285] 114b: Lower end of the jet water outlet

[0286] 116: Jet waterway

[0287] 116a: Upstream flow path of the jet water conduit

[0288] 116b: Curved flow path of the jet water conduit

[0289] 116c: Downstream flow path of the jet water conduit

[0290] 150: Buffer

[0291] 150a : Upstream end of buffer section

[0292] 152: Connection

[0293] D1: Distance from the lower end of the jet water outlet to the inlet of the drainage elbow pipe

[0294] D2: Distance from the upper end of the jet water outlet to the inlet of the drainage elbow pipe

[0295] O101: Center of the jet outlet

[0296] O104: Center of the flow path cross section of the buffer section

[0297] R101: Curvature radius of the outer peripheral surface of the upstream end of the buffer portion

[0298] r101: The curvature radius of the inner peripheral surface of the upstream end of the buffer portion

[0299] R102: The curvature radius of the outer peripheral surface of the connection part

[0300] r102: The curvature radius of the inner surface of the connection part

[0301] 200: The third embodiment of the flush toilet

[0302] 214: Water jet

[0303] 216: Jet waterway

[0304] 216a: Upstream flow path of the jet water conduit

[0305] 216b: Curved flow path of the jet water conduit

[0306] 216c: Downstream flow path of the jet water conduit

[0307] 244: Tightening

[0308] 246: Cross-sectional area fixed part

[0309] 250: First air retention part

[0310] 252: Second air retention section

[0311] R201: Curvature radius of the upstream side of the outer peripheral surface

[0312] R202: Curvature radius of the downstream side of the outer peripheral surface

[0313] r201: Curvature radius of the upstream side of the inner circumference

[0314] r202: Curvature radius of the inner circumference on the downstream side.

Claims

1. A water-flushing toilet, which is a jet siphon type water-flushing toilet, characterized in that: It has: A water storage tank, which is used to store washing water; A bowl portion having a bowl-shaped dirt receiving surface and an inner edge portion formed at an upper edge portion; An inner edge water spout, which is disposed on the inner edge and spouts washing water toward the bowl; A drainage elbow pipeline is arranged at the bottom of the basin and includes: an ascending pipeline extending upward; a descending pipeline extending downward from the ascending pipeline; and a top portion located between the descending pipeline and the ascending pipeline and defining a water seal water level; a jet water spouting port, which is disposed at the bottom of the bowl and spouts washing water toward the inlet of the drain elbow pipe; a jet water conduit connecting the jet water spouting port and the water storage tank and supplying flushing water from the water storage tank to the jet water spouting port; and a drainage device for supplying or stopping the supply of the flushing water stored in the water storage tank to the jet water conduit; The drainage device is driven to make the cleaning water in the water storage tank flow into the jet water conduit, thereby spouting a first flow rate of cleaning water from the jet water spouting port. After the spouting of the first flow rate is completed, the cleaning water retained in the jet water conduit flows toward the jet water spouting port, thereby spouting a second flow rate of cleaning water from the jet water spouting port.

2. The flush toilet according to claim 1, wherein: The maximum instantaneous flow rate of the second flow rate is set to be smaller than the maximum instantaneous flow rate of the first flow rate.

3. The flush toilet according to claim 2, wherein: The instantaneous flow rate of the second flow rate is set to increase to a maximum instantaneous flow rate more slowly than the instantaneous flow rate of the first flow rate.

4. The flush toilet according to claim 1, wherein: The flush toilet is configured to switch between the flush water volume for large flushing and the flush water volume for small flushing by adjusting the jet water spouting time of the first flow rate.

5. The flush toilet according to claim 1, wherein: After the drainage device stops, washing water at the second flow rate is discharged from the jet water discharge port.

6. The flush toilet according to claim 1, wherein: The jet water conduit comprises: an upstream flow path extending forward from the water storage tank; a curved flow path curved from the upstream flow path; and a downstream flow path extending rearward from the curved flow path and connected to the jet water spouting port. The upstream flow passage is arranged substantially in parallel with the drainage trap pipe line, and a bottom surface on a downstream side of the upstream flow passage is located below an upper end of an inlet portion of the drainage trap pipe line.

7. The flush toilet according to claim 6, wherein: In a region on the front side of the top portion of the drainage trap conduit, the bottom surface of the upstream flow path is located below the upper end of the inlet portion of the drainage trap conduit.

8. The flush toilet according to claim 6, wherein: The center of the jet water spout is arranged at the lowest position on the central axis of the jet water conduit.

9. The flush toilet according to claim 1, wherein: The water storage tank is provided with an overflow pipe, and the overflow pipe discharges the water overflowing from the water storage tank. The overflow pipe is arranged at the same position as the drainage device or further behind the drainage device.

10. The flush toilet according to claim 1, wherein: The jet water conduit has a volume greater than 1 / 3 of the water storage tank.

11. The flush toilet according to claim 1, wherein: The jet water conduit comprises: an upstream flow path extending forward from the water storage tank; a curved flow path curved from the upstream flow path; and a downstream flow path extending rearward from the curved flow path and connected to the jet water spouting port. The downstream flow path of the jet water conduit is formed with a curved portion, and the curved portion is eccentric to the opposite side of the upstream flow path with respect to the central axis of the jet water spouting port in a plan view. The bent portion is disposed within the water seal area in a plan view.

12. The flush toilet according to claim 11, wherein: The curved flow path is arranged in the water seal area in a plan view.

13. The flush toilet according to claim 11, wherein: A flow straightening portion is formed in the downstream flow passage on the downstream side of the curved portion, and the flow straightening portion extends linearly toward the jet water spouting port.

14. The flush toilet according to claim 1, wherein: The flush toilet also has a buffer portion, which is arranged at the bottom of the bowl and communicates with the jet water spout and the inlet of the drainage elbow pipeline. The jet water conduit comprises: an upstream flow path extending forward from the water storage tank; a curved flow path curved from the upstream flow path; and a downstream flow path extending rearward from the curved flow path and connected to the jet water spouting port. The jet water conduit and / or the buffer portion is configured to allow the flush water ejected from the jet water spouting port to flow toward the center of the inlet portion of the drainage trap conduit.

15. The flush toilet according to claim 14, wherein: The inner peripheral surface of the curved flow channel of the jet water conduit has a curvature radius smaller on the downstream side than on the upstream side in a plan view.

16. The flush toilet according to claim 15, wherein: The outer peripheral surface of the curved flow channel of the jet water conduit has a curvature radius larger on the downstream side than on the upstream side in a plan view.

17. The flush toilet according to claim 16, wherein: The bottom surface of the curved flow path of the jet water conduit is formed to be substantially horizontal. The upper surface of the curved flow path is inclined downward from the upstream side toward the downstream side, and the height position of the upper surface of the curved flow path on the outer peripheral surface side is higher than the height position on the inner peripheral surface side.

18. The flush toilet according to claim 1, wherein: The jet water conduit comprises: an upstream flow path extending forward from the water storage tank; a curved flow path curved from the upstream flow path; and a downstream flow path extending rearward from the curved flow path and connected to the jet water spouting port. The downstream side flow path of the jet water conduit is formed with a constriction portion, and the constriction portion has the smallest flow path cross-sectional area in the jet water conduit. A cross-sectional area fixed portion having a constant flow path cross-sectional area is formed in the jet water conduit on the upstream side of the constricted portion.

19. The flush toilet according to claim 18, wherein: The flow path cross-sectional area of ​​the constricted portion gradually decreases toward the jet water spouting port.

20. The flush toilet according to claim 18, wherein: The cross-sectional area fixed portion is formed in the curved flow path.

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