Washing toilet

Abstract

A siphon jet-type flush toilet according to the present invention is provided with: a bowl part; a rim spout port for supplying washing water to the bowl part; the drainage elbow pipeline is provided with an ascending pipeline, a descending pipeline and a top part; a spraying water outlet for discharging cleaning water toward the inlet of the drainage elbow pipeline; a water storage tank which is provided with a water discharge valve for injection and stores the washing water supplied to the injection water discharge port; the spraying water guide path guides the cleaning water in the water storage tank to the spraying water outlet through the water head pressure of the cleaning water in the water storage tank; and a controller that controls spouted water discharged from the spouted water port and spouted water discharged from the spouted water port, the water discharge valve for spraying is provided with a valve body that is disposed at a position lower than the upper surface of the bowl part and higher than the water level of the sealing water, and the water discharge valve for spraying is configured so that the spouted water discharged from the spouted water port and the spouted water discharged from the spouted water port are opened before the water discharge valve for spraying is opened. The cleaning water is supplied to the injection water guide path, so that the air between the valve body of the drainage valve for injection and the water surface of the injection water guide path is reduced.

Description

Technical Field

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

[0002] In the past, for example, as described in Patent Document 1, there is a known siphon jet type flush toilet that directly supplies water from a tap water pipe to the inner rim water spouting port, and guides the cleaning water from a water storage tank at a relatively low height to the jet water spouting port by head pressure. In addition, as described in Patent Document 2, there is also a known siphon jet type flush toilet that is configured to continuously perform front inner rim water spouting, middle inner rim water spouting, and rear inner rim water spouting, and performs jet water spouting (sequential control) when spouting water from the middle inner rim.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application No. 5180295

[0006] Patent Document 2: Japanese Patent Application Publication No. 2023-32964

[0007] In the flush toilet of the above-mentioned patent document 1, it is configured that the box is configured with a low profile, and the jet water is guided to the jet water conduit by the water head pressure of the cleaning water in the box. Therefore, there is a space between the valve body of the drain valve and the water level of the jet water conduit (=sealing water level). For the air in this space, when the drain valve of the box is opened to supply cleaning water to the jet water conduit, the air flows out from the jet water spouting port, thereby causing pressure loss.

[0008] Also, in the flush toilet of Patent Document 2, similarly to the flush toilet of Patent Document 1, pressure loss occurs due to the outflow of air from the jet water spouting port. Summary of the invention

[0009] Therefore, the present invention is completed to solve the problems (topics) of the prior art, and its purpose is to provide a siphon jet type flush toilet that can reduce the pressure loss caused by the air between the jet drain valve and the jet water conduit flowing out from the jet water outlet.

[0010] In order to achieve the above-mentioned purpose, the present invention is a siphon-jet type flush toilet, comprising: a bowl portion, having a waste receiving surface and an inner edge portion formed along the upper edge portion of the waste receiving surface; an inner edge water spouting port, formed at the inner edge portion, spouting cleaning water into the bowl portion; a drainage bend pipe pipeline, connected to the bottom of the bowl portion, having an ascending pipe extending from the bottom of the bowl portion to the top, a descending pipe extending from the ascending pipe to the bottom, and a top portion located between these ascending pipes and the descending pipes and defining a sealing water level; a jet water spouting port, arranged at the bottom of the bowl portion in a manner of spouting cleaning water toward the inlet of the drainage bend pipe pipeline; a water storage tank, having a drainage bend pipe for spraying A water valve stores cleaning water supplied to the jet water spouting port; a jet water conduit connects the water storage tank with the jet water spouting port, and guides the cleaning water in the water storage tank to the jet water spouting port through the water head pressure of the cleaning water in the water storage tank; and a control device controls the inner rim water spouted from the inner rim water spouting port and the jet water spouted from the jet water spouting port. The jet drain valve has a valve body, which is arranged at a position lower than the upper surface of the bowl and higher than the sealing water level. The water flushing toilet is configured to supply cleaning water to the jet water conduit before opening the jet drain valve, so as to reduce the air present between the valve body of the jet drain valve and the water surface of the jet water conduit.

[0011] According to the present invention thus constructed, it is provided that: before opening the jet drain valve, cleaning water is supplied to the jet water conduit, so that the air existing between the jet drain valve and the upper part of the jet water conduit is reduced, thereby reducing the pressure loss caused by the air flowing out from the jet water outlet when the cleaning water is supplied from the water storage tank to the jet water conduit.

[0012] In the present invention, it is preferred that the control device continuously spouts cleaning water from the inner edge water spouting port in sequence as "front inner edge water spouting", "middle inner edge water spouting" and "rear inner edge water spouting", and controls the spouting in a "jet water spouting" manner from the jet water spouting port when performing "middle inner edge water spouting".

[0013] In the present invention thus constituted, since the washing water is sequentially spouted out from the rim spouting port as "front rim spouting", "middle rim spouting", and "rear rim spouting", and the "jet spouting" is performed from the jet spouting port in sequence, the washing water supplied to the bowl by the front rim spouting and the accumulated water remaining in the bowl by the rear rim spouting during the previous washing are combined with the washing water spouted by the jet spouting, a large flow of washing water flows into the drainage bend pipe, thereby generating a siphon effect, and the washing water spouted by the jet spouting and the washing water spouted by the middle rim spouting are continued. As a result, according to the present invention, even if the washing water is supplied to the jet conduit with the water head pressure of the washing water passing through the water storage tank with a low profile, the waste can be reliably discharged by the strong siphon effect, and water saving can also be achieved.

[0014] In the present invention, it is preferable that the jet drain valve is opened after washing water is supplied to the jet conduit and the water level of the jet conduit rises to the vicinity of the jet drain valve to discharge air.

[0015] According to the present invention thus constituted, after the water level in the jet water conduit rises to the vicinity of the jet water drain valve to discharge air, the jet water drain valve is opened, thereby reducing pressure loss caused by air when the washing water is spouted from the jet water spouting port.

[0016] In the present invention, it is preferred that the water jetting time of the front inner edge water jetting is shorter than the water jetting time of the rear inner edge water jetting.

[0017] According to the present invention thus constituted, the bowl can be cleaned by the front rim spouting water having a smaller amount of cleaning water than that spouted by the rear rim spouting water, and a siphon effect can be generated by the cleaning water.

[0018] In the present invention, preferably, the control device performs water supply operation to the water tank or opening operation of the jet drain valve so that the tank water level in the water storage tank is higher than the water level of the water surface of the bowl during the washing operation.

[0019] According to the present invention thus constructed, the control device performs water supply operation to the water tank or opening operation of the jet drain valve in such a manner that the tank water level is always higher than the water level of the water surface in the bowl during the cleaning operation even if the water level in the water tank is blocked by dirt, thereby preventing sewage from flowing back from the bowl side to the tank side.

[0020] In the present invention, it is preferable that the control device opens the jet drain valve so as to reduce the flow rate of the washing water discharged from the water storage tank when the water level in the bowl rises.

[0021] According to the present invention thus constructed, when the water level in the bowl rises due to clogging by dirt, etc., the jet drain valve is opened in such a manner as to reduce the flow rate of cleaning water discharged from the water storage tank. Therefore, the water level in the water storage tank is not easy to drop, so the water level in the tank is higher than the water level in the bowl, thereby preventing backflow.

[0022] In the present invention, preferably, the flush toilet further includes an exhaust pipe extending from below the valve body of the jet drain valve to above the water stop level in the water storage tank.

[0023] According to the present invention thus constructed, the air remaining between the jet drain valve and the water surface of the jet water conduit can be effectively discharged through the exhaust pipe. Moreover, the air is discharged from the exhaust pipe into the water storage tank, so the air that flows out to the water sealing surface (water accumulation surface) of the bowl in the form of bubbles can be reduced, so that the cleaning is not adversely affected by the bubbles.

[0024] In the present invention, it is preferred that, before the jet drain valve of the water storage tank is opened, washing water is spouted from the rim spouting port to raise the water level in the bowl, thereby supplying washing water to the jet water conduit.

[0025] According to the present invention thus constituted, before the jetting drain valve of the water storage tank is opened, washing water is spouted from the inner edge spouting port to raise the water level of the bowl, thereby supplying washing water to the jetting water conduit. Therefore, the bowl can be cleaned by the washing water spouted from the inner edge spouting port, and the water level of the bowl is raised by the washing water after the washing, and the washing water is supplied to the jetting water conduit. Moreover, the washing water of the bowl can be used, so water is saved. In addition, since washing water is supplied from the bowl to the jetting water conduit, air easily escapes from the exhaust pipe, and as a result, the number of bubbles discharged to the bowl is reduced, and it is difficult for the user to recognize the bubbles.

[0026] In the present invention, it is preferable that the total jetting time of the front inner edge jetting and the middle inner edge jetting is shorter than the jetting time of the rear inner edge jetting.

[0027] According to the present invention thus constituted, the front rim spouting water and the middle rim spouting water, which have a smaller amount of cleaning water than the rear rim spouting water, can generate and continue the siphon action together with the jet spouting water.

[0028] In the present invention, it is preferable that the water stop level of the wash water in the water storage tank is set higher than the upper surface of the bowl.

[0029] According to the present invention thus constituted, the water stop level (WL0) of the flush water in the water storage tank is set higher than the upper surface of the bowl, so that a large water head pressure can be obtained.

[0030] In the present invention, it is preferable that the water stop level of the wash water in the water storage tank is set to be lower than the upper surface of the bowl.

[0031] According to the present invention thus constituted, the water stop level (WL0) of the flush water in the water storage tank is set lower than the upper surface of the bowl, so that the height of the water storage tank can be reduced, and a further low profile can be achieved.

[0032] In the present invention, it is preferable that the specific gravity of the jet drain valve is within a range of 1.2 to 1.4.

[0033] According to the present invention thus constructed, the specific gravity of the jet drain valve is within the range of 1.2 to 1.4, which is greater than 1, which is the specific gravity of water. Therefore, even if the water level in the bowl rises and the water level in the tank becomes nearly balanced with the water level in the bowl, the jet drain valve will be closed due to its own weight, thereby preventing sewage from flowing back from the bowl into the water storage tank.

[0034] In the present invention, it is preferable that the water level of the flush water in the water storage tank during standby is set above the upper surface of the bowl.

[0035] According to the present invention thus constituted, the water level of the flushing water in the water storage tank during standby is set above the upper surface of the bowl. Therefore, the water level of the bowl during standby does not exceed the water level of the flushing water in the water storage tank, thereby preventing backflow.

[0036] In the present invention, it is preferable that the instantaneous flow rate of the washing water discharged from the water storage tank be reduced by setting the pull-up time of the jet drain valve to a predetermined fixed value.

[0037] According to the present invention thus constructed, by setting the lifting time of the jet drain valve to a predetermined fixed value, when the water level difference between the bowl and the water level of the water tank becomes smaller, the instantaneous flow rate of the cleaning water discharged from the water tank is reduced. Therefore, the water level in the water tank is not easy to decrease, and the water level in the water tank is higher than the water level in the bowl, which can prevent sewage from flowing back from the bowl to the water tank.

[0038] In the present invention, it is preferred that a water seal having a specified water level is formed at the lower portion of the bowl, the flush toilet further comprises a detection unit for detecting the water seal position, the jet water outlet is located within the water seal, and the flush toilet is configured such that: when the water seal position is lower than the specified water seal level, cleaning water is supplied to the bowl to raise the water seal position, and jet water is discharged in this state.

[0039] For example, when a large amount of dirt is blocked and discharged at the same time, and the siphon effect is interrupted after the washing water is replenished to the water storage tank, the water sealing position may be lowered. When the water sealing position is lowered, when the jet flows out from the jet spouting port, the air accumulated in the jet water conduit is ejected from the jet spouting port, squeezing out the washing water and causing water splashing.

[0040] According to the present invention, it is set that: when the sealing water position is lower than the specified sealing water level, cleaning water (sealing water) is supplied to the bowl to raise the sealing water position, and jet water is spouted in this state. Therefore, it is possible to prevent the air accumulated in the jet water conduit from being ejected from the jet water spouting port, squeezing out the cleaning water and causing water splashing.

[0041] In the present invention, preferably, the detection unit for detecting the water sealing position is a tank water level detection unit for detecting the water level of a water storage tank, and the water sealing position is estimated based on the value of the dead water level, the value of the stop water level, or the water supply time required to supply water to the water storage tank to the stop water level detected by the tank water level detection unit.

[0042] According to the present invention thus constituted, the water sealing position is estimated using the already provided tank water level detection means, and therefore, there is no need to newly provide a detection sensor or the like.

[0043] In the present invention, it is preferable that the tank water level detection unit is a float switch that detects a stop water level of the water storage tank.

[0044] According to the present invention thus constituted, since the sealed water position is estimated using the already installed float switch, there is no need to newly install a detection sensor or the like.

[0045] In the present invention, it is preferable that the sealing water is replenished by performing rim water spouting before performing jet water spouting.

[0046] According to the present invention thus constituted, the bowl portion can be cleaned by performing rim water spouting before jet water spouting, and the cleaning water spouted by the rim water spouting can be used as a replenishment of the sealing water.

[0047] In the present invention, it is preferred that an overflow pipe is also provided in the water tank, and the overflow pipe discharges the cleaning water in the water tank to the jet water conduit when the water level in the water tank rises to the water stop level and the water supply time to the water tank becomes longer, and the flush toilet replenishes the cleaning water in the water tank, and the cleaning water is made to flow out from the overflow pipe to the jet water conduit to replenish the sealing water.

[0048] According to the present invention thus constituted, the sealing water can be replenished using the already provided overflow pipe, so the mechanism for replenishing the sealing water can be simplified.

[0049] Effects of the Invention

[0050] According to the siphon jet type flush toilet of the present invention, it is possible to reduce the pressure loss caused by the air existing between the jet drain valve and the jet water conduit flowing out from the jet water spouting port. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a top view showing a flush toilet according to an embodiment of the present invention.

[0052] Figure 2 is along Figure 1 Side cross-sectional view observed along line II-II.

[0053] Figure 3It is a time chart showing "rim water spouting", "tank water supply", "jet water spouting" and "tank water level" in the flush toilet according to the embodiment of the present invention.

[0054] Figure 4A It is a graph showing the water spouting time and water spouting amount of "front inner rim water spouting", "middle inner rim water spouting", "rear inner rim water spouting" and "jet water spouting" in the large cleaning of the flush toilet according to an embodiment of the present invention.

[0055] Figure 4B It is a graph showing the water spouting time and water spouting amount of "front inner rim water spouting", "middle inner rim water spouting", "rear inner rim water spouting" and "jet water spouting" in small cleaning of a flush toilet according to an embodiment of the present invention.

[0056] Figure 5 This is a side cross-sectional view of the flush toilet for explaining the presence of air between the jet drain valve and the jet water conduit in the flush toilet according to the embodiment of the present invention.

[0057] Figure 6 This is a timing chart showing another example of extracting the air existing between the jet drain valve and the jet water conduit.

[0058] Figure 7 This is a partial plan view showing another example of the arrangement of the jet drain valve and the overflow pipe (exhaust pipe) of the flush toilet according to the embodiment of the present invention.

[0059] Figure 8 It is a side sectional view of the flush toilet showing a state in which the sealing water position in the flush toilet has dropped below a prescribed sealing water level.

[0060] Fig. 9 This is a graph obtained through experiments and shows the relationship between the water sealing position (water sealing depth) and the average number of water drops (water splashing) when the water sealing position drops below a predetermined water sealing water level.

[0061] Fig. 10A It is a diagram for explaining the cleaning action of the flush toilet according to the embodiment of the present invention.

[0062] Fig. 10B It is a diagram for explaining the cleaning action of the flush toilet according to the embodiment of the present invention.

[0063] Fig. 10C It is a diagram for explaining the cleaning action of the flush toilet according to the embodiment of the present invention.

[0064] Fig. 10D It is a diagram for explaining the cleaning action of the flush toilet according to the embodiment of the present invention.

[0065] Fig. 10E It is a diagram for explaining the cleaning action of the flush toilet according to the embodiment of the present invention.

[0066] Fig.10F It is a diagram for explaining the cleaning action of the flush toilet according to the embodiment of the present invention.

[0067] Fig.11A It is a line graph showing the instantaneous flow rate of cleaning water spouted from the inner rim water spouting port, the instantaneous flow rate of cleaning water spouted from the jet water spouting port, and the instantaneous flow rate of cleaning water flowing into the inlet of the drainage bend pipe during large cleaning of a flush toilet according to an embodiment of the present invention.

[0068] Fig. 11B It is a line graph showing the instantaneous flow rate of cleaning water spouted from the inner rim water spouting port, the instantaneous flow rate of cleaning water spouted from the jet water spouting port, and the instantaneous flow rate of cleaning water flowing into the inlet of the drainage bend pipe during small flushing of a flush toilet according to an embodiment of the present invention.

[0069] Fig. 12A 1 is a side cross-sectional view showing a water level difference ΔH1 between a stop water level WL0 and a dead water level DWL of flush water in a water storage tank when the flush toilet according to the embodiment of the present invention is on standby.

[0070] Fig. 12B It is a side cross-sectional view showing the water head difference ΔH2 between the dead water level DWL of the flush water in the water storage tank and the water storage surface W when reaching DWL in the flush toilet according to the embodiment of the present invention.

[0071] Fig. 12C 4 is a side cross-sectional view showing a water level difference ΔH3 between a stop water level WL0 and a dead water level DWL of flush water in a water storage tank during tank water supply of a flush toilet according to an embodiment of the present invention.

[0072] Fig.13A 4 is a side cross-sectional view showing a water level difference ΔH4 between a stop water level WL0 of flush water in a water storage tank and a water storage surface W when the flush toilet according to the embodiment of the present invention is on standby when the toilet is clogged.

[0073] Fig. 13B It is a side cross-sectional view showing a water level difference ΔH5 between a dead water level DWL of flush water in a water storage tank and a water storage surface W when the flush toilet reaches DWL when the toilet is clogged according to the embodiment of the present invention.

[0074] Fig. 13C4 is a side cross-sectional view showing a water level difference ΔH6 between a stop water level WL0 of flush water in a water storage tank and a water storage surface W when the tank is supplied with water when the flush toilet according to the embodiment of the present invention is clogged.

[0075] Fig.14 This is a block diagram showing the control contents performed by the controller of the flush toilet according to the embodiment of the present invention.

[0076] Description of reference numerals:

[0077] 1: flush toilet;

[0078] 2: Toilet body;

[0079] 4: Water storage tank;

[0080] 6: pelvic region;

[0081] 8: Drainage elbow pipeline;

[0082] 8a: Entrance;

[0083] 8b: rising pipeline;

[0084] 8c: Downcomer pipe;

[0085] 8d: top;

[0086] 10: Water spout on inner edge;

[0087] 14: Spray water outlet;

[0088] 16: Jet water channel;

[0089] 18: Dirt receiving surface;

[0090] 20: inner edge;

[0091] 24: Water supply device;

[0092] 26: Drainage device;

[0093] 28: Float switch;

[0094] 29, 62: controller;

[0095] 30: Inner edge side solenoid valve;

[0096] 32: water supply port of the tank;

[0097] 34: box side solenoid valve;

[0098] 36, 52: overflow pipe (exhaust pipe);

[0099] 38, 50: Drain valve for jetting;

[0100] 40: Toilet cleaning components;

[0101] 46: water level sensor;

[0102] 60: Operation unit;

[0103] W: water sealing surface (water accumulation surface);

[0104] W1: water sealing position;

[0105] WL0: water stop level;

[0106] DWL: Dead Water Level;

[0107] A: Air. DETAILED DESCRIPTION

[0108] Hereinafter, a flush toilet according to an embodiment of the present invention will be described with reference to the drawings.

[0109] First, through Figure 1 and Figure 2 , the basic structure of the flush toilet according to this embodiment is explained. Figure 1 is a top view showing a flush toilet according to an embodiment of the present invention, Figure 2 is along Figure 1 Side cross-sectional view observed along line II-II.

[0110] like Figure 1 and Figure 2 As shown, the flush toilet 1 according to the present embodiment is a siphon jet flush toilet. The flush toilet 1 comprises: a toilet body 2 made of ceramic; a toilet seat and toilet cover (not shown) made of resin, arranged on the upper surface of the toilet body 2; and a water storage tank 4, arranged at the upper rear part of the toilet body 2 and covered by a resin cover (not shown).

[0111] The toilet body 2 is provided with: a bowl 6 for receiving waste; a drainage elbow pipe 8 provided at the bottom of the bowl 6 for discharging waste by siphoning; an inner edge water spouting port 10 for inner edge water spouting; an inner edge water guide path 12 for guiding cleaning water to the inner edge water spouting port 10; a jet water spouting port 14 for jet water spouting; and a jet water guide path 16 for guiding cleaning water to the jet water spouting port 14.

[0112] 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 platform portion 21 formed between the waste receiving surface 18 and the inner edge portion 20. In addition, the bowl portion 6 includes a pot portion 22, which is formed in the area below the waste receiving surface 18 and is connected to the drainage elbow pipe 8. A sealing surface (water accumulation surface) W is formed inside the pot portion 22.

[0113] The drainage bend pipe 8 comprises: 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 8d located between the descending pipe 8c and the ascending pipe 8b to define the sealing water level of the sealing surface W.

[0114] Here, the lower end of the downcomer pipe 8c of the drain elbow pipe 8 is connected to a drain pipe (not shown) installed on the ground or the wall via a drain socket (not shown).

[0115] The rim water spout 10 is formed at the left rear of the rim portion 20 when the toilet body 2 is viewed from the front. The rim water spout 10 spouts the cleaning water forward, and the cleaning water flows down to the waste receiving surface 18 while rotating on the inner peripheral surface of the rim portion 20 and the table surface of the table portion 21, thereby cleaning the waste receiving surface 18.

[0116] The rim water conduit 12 is formed into a tapered shape in which the flow path cross section gradually decreases toward the rim water spout 10. A water supply hose 23 directly connected to a water pipe is connected to the upstream side of the rim water conduit 12. Washing water is supplied to the rim water conduit 12 from the water pipe, and the washing water is spouted from the rim water spout 10 by the water supply pressure of the water pipe.

[0117] The jet water spouting port 14 is formed at the bottom of the bowl portion 6. The jet water spouting port 14 is disposed opposite to the inlet 8a of the drain trap pipe 8 and faces the inlet 8a of the drain trap pipe 8. The jet water spouting port 14 spouts the washing water toward the inlet 8a of the drain trap pipe 8, and the washing water flows into the drain trap pipe 8 to activate the siphon action.

[0118] 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, and a downstream flow path 16c extending rearward from the curved flow path 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.

[0119] The water storage tank 4 is a gravity-fed tank that stores flushing water for jet spouting and supplies it to the jet spouting port 14. In the water storage tank 4, flushing water is stored up to the water stop level (WL0), and flushing water from the water stop level to the dead water level (DWL) is used for jet spouting. The water storage tank 4 is a small resin tank. 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 bend pipe 8. As a result, the flush toilet 1 is a low-profile toilet.

[0120] The water storage tank 4 is provided with a water supply device 24 for supplying washing water into the water storage tank 4, a drainage device 26 for supplying or stopping the washing water stored in the water storage tank 4 to the injection water conduit 16, and a float switch 28 for sensing the state in which the water level of the washing water in the water storage tank 4 reaches the water stop level (WLO). In addition, the water storage tank 4 is provided with a controller 29 for controlling the water supply device 24 and the drainage device 26 to be driven or stopped based on the operation signal of the user, and an operation unit (not shown) for sending an operation signal according to the operation of the user.

[0121] The water supply device 24 includes: a constant flow valve (not shown) connected to the water pipe; an inner rim side electromagnetic valve 30 for supplying or stopping the washing water to the inner rim water outlet 10; and a tank side electromagnetic valve 34 for supplying or stopping the washing water to the tank water supply port 32 arranged in the water storage tank 4. The inner rim side electromagnetic valve 30 and the tank side electromagnetic valve 34 are driven by the command of the controller 29 based on the user's operation signal and the water level sensing signal of the float switch 28.

[0122] The drainage device 26 includes an overflow pipe 36 for discharging overflow water in the water storage tank 4 to the toilet body, a jet drainage valve 38 fixed to the lower end of the overflow pipe 36, and a toilet cleaning assembly 40 for opening and closing the jet drainage valve 38 by moving the overflow pipe 36 up and down by electric driving force. The upper and lower ends of the overflow pipe 36 are opened, and the overflow water in the water storage tank 4 is discharged to the jet water conduit 16. A guide member 42 for guiding the up and down movement of the jet drainage valve 38 is installed around the drainage port 4a of the water storage tank 4. The toilet cleaning assembly 40 is driven by the command of the controller 29 based on the user's operation signal.

[0123] As described above, the flush toilet 1 is a low-profile toilet, but more specifically, Figure 2 As shown, the valve body 38a of the jet drain valve 38 is arranged at a position lower than the upper surface of the bowl portion 6 (the upper surface of the inner edge portion 20) and higher than the sealing water level.

[0124] In addition, if Figure 2 As shown, the water stop level (WL0) of the water storage tank 4 is set higher than the upper surface of the inner edge 20 of the bowl 6. It should be noted that, as a modified example, the water stop level may be set lower than the upper surface of the inner edge 20 of the bowl 6.

[0125] The controller 29 is electrically connected to the operating unit, the float switch 28, the inner edge side electromagnetic valve 30, the tank side electromagnetic valve 34 and the toilet cleaning assembly 40, and can send and receive various signals. The controller 29 receives a cleaning start signal of a large cleaning or a small cleaning from the operating unit, and drives or stops the inner edge side electromagnetic valve 30, the tank side electromagnetic valve 34 and the toilet cleaning assembly 40 based on a pre-stored cleaning sequence.

[0126] Next, through Figure 3 , the “rim water spouting”, “tank water supply”, “jet water spouting” and “tank water level” in the flush toilet 1 according to the present embodiment are explained. Figure 3 It is a time chart showing "rim water spouting", "tank water supply", "jet water spouting" and "tank water level" in the flush toilet according to the embodiment of the present invention.

[0127] Here, “rim water spouting” refers to the spouting of cleaning water from the rim water spouting port 10 , “tank water supply” refers to the supply of water to the water storage tank 4 , “jet water spouting” refers to the spouting of cleaning water from the jet water spouting port 14 , and “tank water level” refers to the water level of the cleaning water in the water storage tank 4 .

[0128] like Figure 3 As shown, during the large-scale flushing of the flush toilet 1, first, when the user operates the operating unit after the standby state at time t0, the rim-side electromagnetic valve 30 is turned on at time t1, and the water supply to the rim water conduit 12 and the rim spouting of the flushing water from the rim spouting port 10 are started. The rim spouting continues until time t5.

[0129] Next, at time t2, the jet drain valve 38 is opened, and the washing water in the water storage tank 4 starts to be ejected from the jet spouting port 14 through the jet water conduit 16. The jet spouting ends at time t4. When the jet spouting is performed from time t2 to time t4, the inner edge spouting is also performed simultaneously.

[0130] Here, from Figure 3 It can be seen that, for convenience, the inner edge water spouting during the period from the time t1 when the inner edge water spouting starts to the time t2 when the jet water spouting starts is called "front inner edge water spouting", the inner edge water spouting during the period from the time t2 when the jet water spouting is performed to the time t4 is called "middle inner edge water spouting", and the inner edge water spouting during the period from the time t4 when the jet water spouting ends to the time t5 when the inner edge water spouting ends is called "rear inner edge water spouting". In addition, as described above, "jet water spouting" is performed during the period from the time t2 to the time t4.

[0131] Then, if Figure 3 As shown, at time t2 when the water jetting starts, the water level of the washing water in the water storage tank 4 is at the water cut-off level, so the float switch 28 is turned on, but at time t3 thereafter, the water level of the washing water in the water storage tank 4 drops below the water cut-off level, so the float switch 28 is turned off. The closed state of the float switch 28 continues until time t7.

[0132] Furthermore, at time t6, the tank-side electromagnetic valve 34 is opened to start water supply to the water storage tank 4, and the tank water supply ends at time t8. By starting the tank water supply at time t6, the water level of the washing water in the water storage tank 4 rises, and thus, the water level of the washing water in the water storage tank 4 rises to the water stop level to become full water, and the float switch 28 returns to the open state at time t7.

[0133] pass Figure 3 The case of large cleaning is explained, and it is also applied in the case of small cleaning. Figure 3 It should be noted that, as described later, the water discharge time and water discharge amount are different during large cleaning and small cleaning.

[0134] Next, through Figure 4A and Figure 4B The water spouting time and water spouting amount of the inner edge water spouting and the jet water spouting in the large cleaning and small cleaning are explained. Figure 4A The present invention is a graph showing the water spouting time and water spouting amount of "front inner rim water spouting", "middle inner rim water spouting", "rear inner rim water spouting" and "jet water spouting" in the large cleaning of the flush toilet according to an embodiment of the present invention. Figure 4B It is a graph showing the water spouting time and water spouting amount of "front inner rim water spouting", "middle inner rim water spouting", "rear inner rim water spouting" and "jet water spouting" in small cleaning of a flush toilet according to an embodiment of the present invention.

[0135] like Figure 4A As shown, in the case of large cleaning, the water spouting time of the front inner edge is 1.9 seconds (s), the water spouting volume is 0.41 liters (L), the water spouting time of the middle inner edge is 2.4 seconds (s), the water spouting volume is 0.52 liters (L), and the water spouting time of the rear inner edge is 6.1 seconds (s), and the water spouting volume is 1.32 liters (L). In addition, the water spouting time of the jet spout is 2.4 seconds (s), and the water spouting volume is 2.31 liters (L).

[0136] from Figure 4A It can be seen that in the case of large cleaning, the spouting time of the front inner edge spouting (1.9 seconds) is shorter than the spouting time of the rear inner edge spouting (6.1 seconds). In addition, the total spouting time of the front inner edge spouting and the middle inner edge spouting (1.9 seconds + 2.4 seconds) is shorter than the spouting time of the rear inner edge spouting (6.1 seconds).

[0137] Likewise, if Figure 4BAs shown, in the case of small washing, the water spouting time of the front inner edge is 1.4 seconds (s), the water spouting volume is 0.31 liters (L), the water spouting time of the middle inner edge is 1.7 seconds (s), the water spouting volume is 0.37 liters (L), and the water spouting time of the rear inner edge is 7.6 seconds (s), and the water spouting volume is 1.64 liters (L). In addition, the water spouting time of the jet spout is 1.7 seconds (s), and the water spouting volume is 1.50 liters (L).

[0138] from Figure 4B It can be seen that in the case of small cleaning, similar to the above-mentioned large cleaning, the spouting time of the front inner edge spouting (1.4 seconds) is shorter than the spouting time of the rear inner edge spouting (7.6 seconds). In addition, the total spouting time of the front inner edge spouting and the middle inner edge spouting (1.4 seconds + 1.7 seconds) is shorter than the spouting time of the rear inner edge spouting (7.6 seconds).

[0139] Next, through Figure 5 , the existence of air between the jet drain valve and the jet water conduit in the flush toilet 1 according to the present embodiment will be described. Figure 5 This is a side cross-sectional view of the flush toilet for explaining the presence of air between the jet drain valve and the jet water conduit in the flush toilet according to the embodiment of the present invention.

[0140] like Figure 5 As shown, in the flush toilet 1 in the standby state, the cleaning water spouted by the above-mentioned rear inner edge spouting is stored as sealing water (accumulated water) in the lower part of the bowl 6. As a result, in the jet water conduit 16, the cleaning water is filled to a height position corresponding to the sealing water level. On the other hand, the valve body 38a of the jet drain valve 38 is arranged above the sealing water level, so that air A remains between the valve body 38a of the jet drain valve 38 and the upper part of the jet water conduit 16. When the jet water is spouted, when the jet drain valve 38 is opened and the cleaning water in the water storage tank 4 flows out to the jet water conduit 16 and is spouted from the jet water spouting port 14, the air A is mixed in the jet water spouting, resulting in a cracking sound and a pressure loss.

[0141] In the present embodiment, in order to reduce the pressure loss caused by the air A, it is set that before the jet drain valve 38 is opened, as shown in the first and second examples described below, the air A remaining between the valve body 38a of the jet drain valve 38 and the upper part of the jet water conduit 16 is discharged to the outside.

[0142] First, refer to Figure 3 The first example is explained below. Figure 3As shown, after the standby state, at time t1, the inner rim side electromagnetic valve 30 is opened, and the cleaning water is discharged from the inner rim water spouting port 10 (that is, the above-mentioned front inner rim water spouting is performed), and the cleaning water is supplied to the bowl 6, and the sealing water surface (water accumulation surface) W rises from the sealing water level, and the water surface of the bowl 6 is at a position higher than the sealing water level. At this time, the cleaning water of the bowl 6 is supplied from the jet water spouting port 14 to the jet water conduit 16, thereby, the water surface of the jet water conduit 16 rises to the vicinity of the valve body 38a of the jet drainage valve 38. In this way, the amount of cleaning water discharged from the inner rim water spouting port 10 is preferably an amount that can make the water surface of the jet water conduit 16 rise to the vicinity of the valve body 38a of the jet drainage valve 38. At this time, the overflow pipe 36 is arranged to extend from below the valve body 38a of the jet drain valve 38 to above the water stop level, so that the water level of the jet water conduit 16 rises and the air A passes through the inside of the overflow pipe 36 and is discharged to the space above the water storage tank 4. At this time, the overflow pipe 36 functions as an exhaust pipe.

[0143] In this first example, at time t1, after the cleaning water is ejected from the inner edge water outlet 10, the jet drain valve 38 is opened at time t2, so that the cleaning water flowing out to the jet water conduit 16 does not contain air. Even if air is contained, the amount is very small, so that the pressure loss can be reduced when the cleaning water is ejected from the jet water outlet 14.

[0144] In the first example described above, the inner edge side electromagnetic valve 30 is opened, and the cleaning water is discharged from the inner edge water discharge port 10, thereby raising the water sealing surface W from the water sealing position. Instead of the first example, the following modified example may be used. That is, an inner edge drain valve (not shown) may be provided in the water storage tank 4 together with the jet drain valve 38, and the position of the water sealing surface W may be raised by opening the inner edge drain valve.

[0145] Next, through Figure 6 The second example will be described. Figure 6 This is a timing chart showing another example (second example) for extracting the air existing between the jet drain valve and the jet water conduit.

[0146] like Figure 6 As shown, after the standby state, during the period from time t11 to time t12, the tank-side electromagnetic valve 34 is opened to supply washing water to the water storage tank 4. At this time, the water level of the water storage tank 4 is the water stop level, so when the water level of the water storage tank 4 rises from the water stop level to the upper end of the overflow pipe 36 by the water supply, the washing water flows into the overflow pipe 36 from the upper end opening of the overflow pipe 36 and is supplied to the jet water conduit 16. As a result, the water surface of the jet water conduit 16 rises to the vicinity of the valve body 38a of the jet drain valve 38. As a result, the air A passes through the inside of the overflow pipe (exhaust pipe) 36 and is discharged to the upper space of the water storage tank 4.

[0147] In this second example, after time t12 when the supply of cleaning water to the water storage tank 4 ends, the jet drain valve 38 is opened at time t2, so that the cleaning water flowing out to the jet water conduit 16 does not contain air. Even if air is contained, the amount is very small, so that the pressure loss can be reduced when the cleaning water is ejected from the jet water outlet 14.

[0148] Next, through Figure 7 Another example of the arrangement of the jet drain valve and the overflow pipe will be described. Figure 7 This is a partial plan view showing another example of the arrangement of the jet drain valve and the overflow pipe (exhaust pipe) of the flush toilet according to the embodiment of the present invention.

[0149] like Figure 7 As shown, in this example, the jet drain valve 50 does not include an overflow pipe, and only opens and closes the drain port of the water storage tank 4. In addition, the overflow pipe 52 is arranged on the rear side of the jet drain valve 50.

[0150] Next, through Figure 8 The following describes a situation in which the sealing water position in a flush toilet drops below a prescribed sealing water level. Figure 8 It is a side sectional view of the flush toilet showing a state in which the sealing water position in the flush toilet has dropped below a prescribed sealing water level.

[0151] In the flush toilet 1, the sealing water level is set based on the inlet 8a of the drainage trap pipe 8 and is usually maintained at a predetermined sealing water level ( Figure 2 The position of the sealing water surface W).

[0152] In the flush toilet 1, the water sealing position is usually maintained at a predetermined water sealing level (the position W of the water sealing surface). However, in the following situation, the water sealing position W1 may be changed. Figure 8 As shown, it is lowered to below the sealing water level.

[0153] For example, when the toilet is being constructed and the power is turned on, sometimes the wash water is not supplied to the bowl, in which case the water seal position is lowered. In addition, when dirt is blocked in the water distribution pipe or the drainage elbow pipe, the water seal position is also lowered when the suction of the wash water is prolonged due to the siphon effect. In addition, when the power is turned on after the blockage caused by the dirt is eliminated, the water seal position is sometimes lowered. In the case where the amount of wash water supplied (replenished) to the bowl is small, the water seal position is also lowered.

[0154] Thus, the present inventors found that when the water sealing position is lowered below a predetermined water sealing level and washing water is discharged from the jet water spouting port 14, the air accumulated in the jet water conduit 16 is ejected from the jet water spouting port 14, squeezing out the washing water and causing water splashing.

[0155] Therefore, the present inventors conducted experiments to verify under what water sealing positions water splashing would often occur.

[0156] Fig. 9 This is a line graph obtained through experiments, showing the relationship between the water sealing position (water sealing depth) and the average number of water droplets (water splashing) when the water sealing position drops below the specified water sealing level. Fig. 9 In the figure, the water sealing position (water sealing depth) is based on the upper end 8e of the inlet 8a of the drainage trap pipe 8.

[0157] From this Fig. 9 It is found that the largest number of water droplets are splashed when the water sealing position (water sealing depth) is near the upper end of the jet water spouting port 14 .

[0158] Next, a method for sensing that the sealing water position has dropped below a predetermined sealing water level is described. First, a water level sensor 46 (see FIG. 1 ) for detecting the sealing water position is provided at one or more locations in the jet water conduit 16. Figure 8 ), the water level sensor 46 senses that the sealing water position drops below the specified sealing water level.

[0159] Next, as described above, the water storage tank 4 is provided with a float switch 28 for sensing the water stop level (WL0). The float switch 28 can indirectly sense the lowering of the water stop level according to the change in the water supply time to the water storage tank 4.

[0160] That is, when the sealing position is at the prescribed sealing level, after the jetting of water, the water level in the water storage tank 4 is lowered to the prescribed dead water level (DWL). However, for example, when dirt is clogged in the drain pipe or the drain elbow pipe 8 and the sealing position is lowered to below the prescribed sealing level, the head pressure between the water level of the washing water in the water storage tank and the sealing position becomes larger, and more washing water is discharged from the water storage tank during washing, so the water level is lowered to below the prescribed dead water level (DWL). When water is supplied to the water storage tank 4 from this state, the time from the dead water level (DWL) to the water stop level (WL0) sensed by the float switch 28 is extended, resulting in a deviation from the normal water supply time. The reduction of the sealing position can be sensed based on the deviation of the water supply time (the water supply time becomes longer).

[0161] It should be noted that a float switch for detecting a dead water level (DWL) may be provided, and the float switch may detect that the dead water level drops below a predetermined dead water level, thereby sensing a decrease in the sealing water position.

[0162] In addition, as another example of sensing the lowering of the sealing water position, the change in the inflow amount from the water source is predicted based on the time required for the water level of the water storage tank 4 to rise from the dead water level (DWL) to the stop water level (WL0). In the case where the water level rise takes longer than usual, in other words, when the water supply time is longer than usual, the inflow amount from the water source may have decreased. In such a case, the sealing water position is lowered due to insufficient replenishment by the rear inner edge water discharge described later. Therefore, the lowering of the sealing water position can be sensed based on the time taken for the water level in the water storage tank to rise.

[0163] In the flush toilet 1 according to the present embodiment, when it is sensed that the sealing water position has dropped below a predetermined sealing water level, before jetting water, the bowl 6 is replenished with clean water, and when the sealing water position has returned to the predetermined sealing water position, the bowl 6 is jetted with clean water. The replenishment of clean water to the bowl 6 is performed by the first and second examples described below.

[0164] In the first example, Figure 3 The time from time t1 to time t2 as the front inner edge water spouting time is longer than the normal case (when the water sealing position is at the specified water sealing level) (time t1 is advanced), and due to this extended time, the supply of washing water to the bowl 6 is increased than the normal case, and the lowered water sealing position is returned to the specified water sealing level. Thereafter, the water spouting starts at time t2.

[0165] In the second example, starting at time t2 Figure 3 Before the jet water spouting shown in the figure, the tank side electromagnetic valve 34 is opened to supply washing water to the water storage tank 4, so that the water level in the water storage tank 4 rises to a level higher than the upper end of the overflow pipe 36. As a result, the washing water flows from the upper end into the overflow pipe 36, passes through the jet water conduit 16, and the washing water is replenished into the bowl 6, and the sealing position returns to the specified sealing water level. After that, the jet water spouting starts.

[0166] Next, through Figures 10A to 10F The cleaning operation of the flush toilet according to the embodiment of the present invention will be described. Figures 10A to 10F It is a diagram for explaining the cleaning action of the flush toilet according to the embodiment of the present invention.

[0167] Fig. 10AIn the standby state, the washing water is accumulated in the bowl 6 to the sealing water level W, and the washing water is also accumulated to the same height as the sealing water level in the jet water conduit 16. At this time, as described above, the air A is accumulated between the valve body 38a of the jet drain valve 38 of the water storage tank 4 and the upper part of the jet water conduit 16.

[0168] Then, if Fig. 10B As shown, the inner rim side electromagnetic valve 30 is opened to start the inner rim water discharge, and the water level of the washing water gradually rises in the bowl 6. Along with this, the water level of the washing water in the jet water conduit 16 also gradually rises, and the accumulated air A is discharged from the overflow pipe 36, and the jet water conduit 16 is filled with water (refer to the first example mentioned above).

[0169] Afterwards, if Fig. 10C As shown, the jet drain valve 38 is opened during the process of the inner rim spouting, and the jet spouting starts. At this time, the accumulated water (sealed water) remaining in the bowl 6 and the cleaning water spouted by the inner rim spouting and the cleaning water spouted by the jet spouting are combined, and a large flow of cleaning water flows into the drain elbow pipe 8, thereby generating a strong siphon effect to discharge waste.

[0170] Then, if Fig. 10D As shown, the jet drain valve 38 is closed during the rim water spouting process. Even if the drain valve 38 is closed, the rim water spouting and the jet water spouting flow into the drain trap pipe 8, so the siphon effect can continue.

[0171] Afterwards, if Fig. 10E As shown in the figure, the accumulated water is discharged by the siphon effect, thereby the water level of the washing water in the bowl 6 is lowered, and air enters from the upper part of the inlet 8a of the drainage bend pipe 8, and the siphon effect ends. After the siphon effect ends, the inner edge water spouting continues, and ends when the washing water in the bowl 6 accumulates to the sealing water level. At this time, the washing water in the jet water conduit 16 also accumulates to the same height as the sealing water level.

[0172] Then, if Fig.10F As shown, the tank side electromagnetic valve 34 is opened to start water supply to the tank. When the water level of the cleaning water in the water storage tank 4 rises, when the float switch 28 senses that it is at the water stop level, the tank side electromagnetic valve 34 is closed. Then, as shown in FIG. Fig. 10A As shown, it returns to the original standby state.

[0173] Next, through Fig.11A and Fig. 11B , in a water-washing toilet according to an embodiment of the present invention, the instantaneous flow rate of washing water spouted from the inner edge water spouting port in large and small washings, the instantaneous flow rate of washing water spouted from the jet water spouting port, and the instantaneous flow rate of washing water flowing into the inlet of the drainage bend pipe are described. Fig.11AThe diagram is a line graph showing the instantaneous flow rate of the washing water spouted from the inner rim water spouting port, the instantaneous flow rate of the washing water spouted from the jet water spouting port, and the instantaneous flow rate of the washing water flowing into the inlet of the drainage bend pipe during the large flushing of the flush toilet according to an embodiment of the present invention. Fig. 11B It is a line graph showing the instantaneous flow rate of cleaning water spouted from the inner rim water spouting port, the instantaneous flow rate of cleaning water spouted from the jet water spouting port, and the instantaneous flow rate of cleaning water flowing into the inlet of the drainage bend pipe during small flushing of a flush toilet according to an embodiment of the present invention.

[0174] exist Fig.11A and Fig. 11B In the figure, the dotted line represents the instantaneous flow rate of the cleaning water ejected from the jet water spouting port 14, the single-dot chain line represents the instantaneous flow rate of the cleaning water ejected from the inner edge water spouting port 10, and the solid line represents the instantaneous flow rate of the cleaning water flowing into the inlet 8a of the drainage bend pipe 8.

[0175] like Fig.11A As shown in FIG. 1 , during the large wash, at time t2, the jet drain valve 38 is opened, and the wash water in the water storage tank 4 is discharged from the jet water spouting port 14 through the jet water conduit 16. The instantaneous flow rate of the jet water spouting indicated by the dotted line increases sharply immediately after the start, and then remains substantially constant. At time t4, the jet drain valve 38 is closed, thereby also reducing the instantaneous flow rate of the jet water spouting.

[0176] The instantaneous flow rate of the rim water spouting indicated by the one-dot chain line is constant, and the rim water spouting is also performed during the period from time t2 to time t4 when the jet water spouting is performed.

[0177] Furthermore, the washing water ejected by the rear rim spouting during the previous washing remains in the bowl portion 6 as accumulated water.

[0178] Therefore, during the period from time t2 to time t4, the cleaning water spouted by the inner rim spouting and the accumulated water remaining in the bowl 6 due to the rear inner rim spouting during the previous cleaning are combined with the cleaning water spouted by the jet spouting, and a large flow of cleaning water flows into the inlet 8a of the drainage bend pipe 8 as shown by the solid line.

[0179] As a result, in the present embodiment, even if cleaning water is supplied to the jet water conduit 16 by the head pressure of the cleaning water from the low-profile water storage tank (although it is not easy to produce a siphon effect only by the jet water spouting), the cleaning water spouted by the inner edge water spouting and the accumulated water also flow into the inlet 8a of the drainage bend pipe 8 together, so that the dirt can be reliably discharged by the strong siphon effect.

[0180] After the jet drain valve 38 is closed at time t4, the instantaneous flow rate of jet spouting water decreases but the rim spouting water continues at the same instantaneous flow rate. Therefore, the instantaneous flow rate of the washing water spouted by the jet spouting water and the rim spouting water decreases, but the siphon effect can be continued.

[0181] In this way, even if the water storage amount of the water storage tank 4 is not increased, a strong siphon effect can be generated and the siphon effect can be continued, so water saving can be achieved.

[0182] Then, if Fig. 11B As shown in FIG. 1 , during small washing, at time t2, the jet drain valve 38 is opened, and the washing water in the water storage tank 4 passes through the jet water conduit 16 and is discharged from the jet water spouting port 14. The instantaneous flow rate of the jet water spouting shown by the dotted line increases sharply immediately after the start, and then remains substantially constant. At time t4, the jet drain valve 38 is closed, thereby reducing the instantaneous flow rate of the jet water spouting.

[0183] The instantaneous flow rate of the rim water spouting indicated by the one-dot chain line is constant, and the rim water spouting is also performed during the period from time t2 to time t4 when the jet water spouting is performed.

[0184] Furthermore, the washing water ejected by the rear rim spouting during the previous washing remains in the bowl portion 6 as accumulated water.

[0185] Therefore, during the period from time t2 to time t4, the washing water spouted by the jet spouting and the rim spouting flows into the inlet 8a of the drain trap conduit 8. However, after time t4, the washing water spouted by the rim spouting and the accumulated water remaining in the bowl 6 are combined with the washing water spouted by the jet spouting, and a large flow of washing water flows into the inlet 8a of the drain trap conduit 8 as shown by the solid line.

[0186] As a result, in the present embodiment, even in the case of small cleaning, even if cleaning water is supplied to the jet water conduit 16 by the head pressure of the cleaning water from the low-profile water storage tank (although it is not easy to produce a siphon effect only by the jet water spouting), the cleaning water spouted by the inner edge water spouting and the accumulated water also flow into the inlet 8a of the drainage bend pipe 8 together, so that the dirt can be reliably discharged through the strong siphon effect.

[0187] Furthermore, after a strong siphon effect is generated, the instantaneous flow rate of the washing water spouted by the jet spouting and the rim spouting decreases, but the siphon effect can be continued.

[0188] Thus, even if the water storage amount of the water storage tank 4 is not increased during small washing, a strong siphon effect can be generated, and the siphon effect can be continued, so that water saving can be achieved.

[0189] Next, through FIG. 12A to FIG. 12CThe following describes the water level difference between the water level of the flush water in the water storage tank and the water level of the water storage surface in the normal state (when the toilet is not clogged) of the flush toilet 1 according to the present embodiment. Fig. 12A is a side cross-sectional view showing a water level difference ΔH1 between a stop water level WL0 and a dead water level DWL of the flush water in the water storage tank when the flush toilet according to the embodiment of the present invention is on standby. Fig. 12B 1 is a side cross-sectional view showing the water level difference ΔH2 between the dead water level DWL of the flush water in the water storage tank and the water surface W when the flush water reaches DWL. Fig. 12C It is a side cross-sectional view showing a water level difference ΔH3 between a stop water level WL0 and a dead water level DWL of the flush water in the water storage tank during tank water supply.

[0190] First, if Fig. 12A As shown, during standby, there is a water level difference of ΔH1 between the stop water level WL0 of the water storage tank 4 and the dead water level DWL, and the dead water level DWL is higher than the water level of the water accumulation surface W. Therefore, even if the jet drain valve 38 is opened after standby, the accumulated water on the water accumulation surface W will not flow back to the water storage tank 4.

[0191] Then, if Fig. 12B As shown in FIG. 1 , when reaching DWL, the water level W rises to a level higher than the standby level described above. However, there is a water level difference of ΔH2 (<ΔH1) between the dead water level DWL of the water storage tank 4 and the water level W. Therefore, even when the front and rear jet drain valves 38 are opened and the water storage tank 4 is connected to the water level W when reaching DWL, there is a water level difference of ΔH2 (<ΔH1) between the dead water level DWL and the water level W. Fig. 12B As shown, there is a sufficient water level difference, so the accumulated water on the water accumulation surface W will not flow back to the water storage tank 4.

[0192] Then, if Fig. 12C As shown, when the water is supplied from the tank, as in the standby state described above, there is a water level difference of ΔH3 (= ΔH1) between the stop water level WL0 of the water storage tank 4 and the dead water level DWL, and the dead water level DWL is higher than the water level of the water accumulation surface W. Therefore, in this state, even if the jet drain valve 38 is opened to connect the water accumulation surface W and the water storage tank, the accumulated water on the water accumulation surface W will not flow back to the water storage tank 4.

[0193] Next, through FIG. 13A to FIG. 13C The following describes the difference between the water level of the flush water in the water storage tank and the water surface when the flush toilet 1 according to the present embodiment is clogged. Fig.13A 4 is a side cross-sectional view showing a water level difference ΔH4 between a stop water level WL0 of flush water in a water storage tank and a water storage surface W when the flush toilet according to an embodiment of the present invention is on standby when a toilet is clogged. Fig. 13B1 is a side cross-sectional view showing the water level difference ΔH5 between the dead water level DWL of the flush water in the water storage tank and the water storage surface W when the flush water reaches DWL. Fig. 13C It is a side cross-sectional view showing a water level difference ΔH6 between a stop water level WL0 of flush water in the water storage tank and a water storage surface W during tank water supply.

[0194] First, a method for sensing the rise of the water level W to a position higher than the normal position (sealing position) is described. When the toilet is clogged and the water level W rises to a position higher than the normal position, the head pressure between the water level of the washing water in the water storage tank 4 and the water level becomes smaller, and the amount of washing water discharged from the water storage tank 4 during washing is less than the normal amount. Therefore, the water level in the water storage tank 4 is at a position higher than the normal dead water level (DWL). When water is supplied to the water storage tank 4 from this state, the time from the dead water level at the upper position to the water stop level (WL0) sensed by the float switch 28 becomes shorter, resulting in a deviation from the normal water supply time. The rise of the water level W can be sensed based on the deviation of the water supply time (the water supply time becomes shorter).

[0195] First, if Fig.13A As shown in FIG. 1 , when the toilet is clogged, the water surface W rises to a higher position than the normal position during standby. Therefore, the water level difference between the stop water level WL0 of the water storage tank 4 and the water surface W is ΔH4, and the water level difference becomes smaller than that in normal times. However, the stop water level WL0 is located above the upper surface of the bowl, so even if the jet drain valve 38 is opened in this state, the water on the water surface W will not flow back to the water storage tank 4.

[0196] Then, if Fig. 13B As shown in FIG. 1 , when the dead water level (DWL) is reached, the water surface W rises further than the standby state described above. At this time, as described above, the dead water level is at a position that rises to a position higher than the normal dead water level. Therefore, the water level difference between the dead water level DWL of the washing water in the water storage tank 4 and the water surface W is ΔH5, which is a small value, and the two are in a balanced state. However, as described later, the specific gravity of the jet drain valve 38 is about 1.3, so even if it is in a balanced state, the jet drain valve 38 will be closed due to its own weight, so the accumulated water on the water surface W will not flow back to the water storage tank 4.

[0197] Then, if Fig. 13C As shown in FIG. 1 , when water is supplied from the tank, the water surface W also rises to a considerable extent. However, the water level of the water storage tank 4 becomes the water stop level WL0 due to the water supply from the tank, and the water stop level WL0 is located above the upper surface of the bowl. Therefore, even if the jet drain valve 38 is opened in this state, the water on the water surface W will not flow back to the water storage tank 4.

[0198] Next, through Fig.14The following describes the control contents for supplying water to the water storage tank and draining water from the water storage tank in the flush toilet according to the present embodiment. Fig.14 This is a block diagram showing the control contents performed by the controller of the flush toilet according to the present embodiment.

[0199] like Fig.14 As shown, when the user operates the operating unit 60, the operating signal is sent to the controller 62. If the operating signal is a signal related to starting or stopping the inner edge water spouting, the inner edge side electromagnetic valve 30 is opened or closed to start or stop the inner edge water spouting.

[0200] If the operation signal is a signal related to the water supply to the water storage tank, the tank-side electromagnetic valve 34 is opened or closed to supply or stop water to the water storage tank 4 .

[0201] If the operation signal is a signal related to the opening operation or the closing operation of the jet drain valve 38 , the opening operation or the closing operation of the jet drain valve 38 is performed by the toilet cleaning assembly 40 .

[0202] Next, the effects of the flush toilet according to the above-mentioned embodiment of the present invention will be described.

[0203] According to the flush toilet 1 based on the present embodiment, it is configured that: before opening the jet drain valve 38, cleaning water is supplied to the jet water conduit 16, so that the air A existing between the jet drain valve 38 and the upper part of the jet water conduit 16 is reduced, thereby reducing the pressure loss caused by the air flowing out from the jet water outlet 14 when cleaning water is supplied from the water storage tank 4 to the jet water conduit 16.

[0204] In the flush toilet 1 according to the present embodiment, since the flush water is sequentially spouted from the rim spouting port 10 as "front rim spouting", "middle rim spouting", and "rear rim spouting", and the "jet spouting" is performed from the jet spouting port 14 during the "middle rim spouting", the flush water supplied to the bowl 6 by the front rim spouting and the accumulated water remaining in the bowl 6 by the rear rim spouting during the previous washing are combined with the flush water spouted by the jet spouting, a large flow of flush water flows into the drainage bend pipe 8, thereby generating a siphon effect, and the siphon effect is continued by the flush water spouted by the jet spouting and the flush water spouted by the middle rim spouting. As a result, according to the present embodiment, even if flush water is supplied to the jet conduit 16 by the water head pressure of the flush water of the water storage tank 4 with a low profile and a limited volume, waste can be reliably discharged by a strong siphon effect, and water saving can also be achieved.

[0205] According to the flush toilet 1 based on the present embodiment, after the water level in the jet water conduit 16 rises to the vicinity of the jet drain valve 38 and the air A is discharged, the jet drain valve 38 is opened, thereby reducing the pressure loss caused by the air when the cleaning water is ejected from the jet water spout 14.

[0206] According to the flush toilet 1 based on the present embodiment, the water spouting time of the front inner edge is shorter than the water spouting time of the rear inner edge. Therefore, the bowl 6 can be cleaned by the front inner edge water spouting which is less than the amount of cleaning water spouted by the rear inner edge water spouting, and a siphon effect can be generated by the cleaning water.

[0207] In the flush toilet 1 according to the present embodiment, the water supply to the water tank 4 by the tank side solenoid valve 34 or the opening operation of the jet drain valve 38 by the toilet cleaning component 40 is performed by the controller 62 in such a way that the tank water level in the water tank 4 is at a position higher than the water level of the water accumulation surface W of the bowl 6 during the cleaning operation.

[0208] Therefore, according to the flush toilet 1 based on this embodiment, during the cleaning operation, even if waste is blocked in the drainage bend pipe 8 and the tank water level is in equilibrium with the water level of the rising water surface W, sewage can be prevented from flowing back from the bowl 6 to the water storage tank 4.

[0209] In the flush toilet 1 according to the present embodiment, when the water level in the bowl 6 rises due to clogging of dirt, etc., the controller 62 reduces the flow rate of the cleaning water discharged from the water tank 4, that is, shortens the opening time of the jet drain valve 38, thereby making it difficult for the water level in the water tank 4 to drop and making the water level in the water tank 4 higher than the water level in the bowl 6, thereby preventing backflow.

[0210] According to the flush toilet 1 based on this embodiment, the air A remaining between the jet drain valve 38 and the water surface of the jet water conduit 16 can be effectively discharged through the overflow pipe (exhaust pipe) 36. In addition, the air A is discharged from the overflow pipe 36 into the water storage tank 4, so that the air that flows out to the water sealing surface (water accumulation surface) W of the bowl 6 in the form of bubbles can be reduced, and therefore, the cleaning will not be adversely affected by the bubbles.

[0211] According to the flush toilet 1 according to the present embodiment, before the jetting drain valve 38 of the water storage tank 4 is opened, the water level of the bowl 6 is raised by spouting the washing water from the inner rim spouting port 10, thereby supplying the washing water to the jetting water conduit 16. Therefore, the bowl 6 can be cleaned by the washing water spouted from the inner rim spouting port 10, and the water level of the bowl 6 is raised by the washing water after the washing, and the washing water is supplied to the jetting water conduit 16. Moreover, the washing water of the bowl 6 can be used, so water is also saved. In addition, since the washing water is supplied from the bowl 6 to the jetting water conduit 16, the air A easily escapes from the overflow pipe 36, and as a result, the number of bubbles discharged to the bowl 6 is also reduced, and it is difficult for the user to recognize the bubbles.

[0212] According to the flush toilet 1 based on the present embodiment, the total water spouting time of the front inner edge water spouting and the middle inner edge water spouting is shorter than the water spouting time of the rear inner edge water spouting. Therefore, the front inner edge water spouting and the middle inner edge water spouting, which have a less amount of cleaning water than the cleaning water spouted by the rear inner edge water spouting, can generate a siphon effect together with the jet water spouting, and the siphon effect can be continued.

[0213] According to the flush toilet 1 according to the present embodiment, the water stop level (WL0) of the flush water in the water storage tank 4 is set higher than the upper surface of the bowl 6, so that a large water head pressure can be obtained.

[0214] According to the flush toilet 1 according to this embodiment, the water stop level (WL0) of the flush water in the water storage tank is set lower than the upper surface of the bowl, so the height of the water storage tank 4 can be reduced, and a further low profile can be achieved.

[0215] In the flush toilet 1 according to the present embodiment, the specific gravity of the jet drain valve 38 is set to about 1.3. In addition, the specific gravity of the jet drain valve 38 is preferably within a range of 1.2 to 1.4.

[0216] In this way, by setting the specific gravity of the jet drain valve to a range of 1.2 to 1.4 (including 1.3), even if the water level in the bowl 6 rises and the water level in the water tank 4 becomes close to the equilibrium state with the water level in the bowl 6, the jet drain valve 38 will be closed due to its own weight, thereby preventing sewage from flowing back from the bowl 6 to the water tank 4.

[0217] In the flush toilet 1 according to the present embodiment, the water level of the flush water in the water tank during standby is set above the upper surface of the bowl 6. Therefore, the water level of the bowl during standby will not be higher than the water level of the flush water in the water tank, thereby preventing backflow.

[0218] In the flush toilet 1 according to the present embodiment, by setting the lifting time of the jet drain valve 38 to a predetermined fixed value, the instantaneous flow rate of the cleaning water discharged from the water tank 4 is reduced when the water level difference between the bowl 6 and the water tank 4 is reduced. Therefore, the water level in the water tank 4 is not easy to decrease, and the water level in the water tank 4 is higher than the water level in the bowl 6, which can prevent sewage from flowing back from the bowl 6 to the water tank 4.

[0219] For example, when a large amount of dirt is blocked and discharged at the same time, and the siphon effect is interrupted after the washing water is replenished to the water storage tank 4, the water sealing position may be lowered. When the jet flows out from the jet spouting port 14 when the water sealing position is lowered, the air accumulated in the jet water conduit 16 is ejected from the jet spouting port 14, squeezing out the washing water and causing water splashing.

[0220] According to the flush toilet 1 based on the present embodiment, it is configured that: when the sealing water position is lower than the prescribed sealing water level, cleaning water (sealing water) is supplied to the bowl 6 to raise the sealing water position, or to raise it to near the prescribed sealing water level, and jet water is spouted in this state, thereby preventing the air accumulated in the jet water conduit 16 from being ejected from the jet water spouting port 14, squeezing out the cleaning water and causing water splashing.

[0221] According to the flush toilet 1 according to the present embodiment, the water sealing position is estimated using the tank water level detection means such as the already provided float switch 28, and therefore, there is no need to newly provide a detection sensor or the like.

[0222] According to the flush toilet 1 according to this embodiment, the bowl of the bowl 6 can be cleaned by performing rim water spouting before jet water spouting, and the cleansing water spouted by the rim water spouting can be used as a replenishment of sealing water.

[0223] According to the flush toilet 1 according to the present embodiment, since the sealing water can be replenished using the already provided overflow pipe 36, the mechanism for replenishing the sealing water can be simplified.

Claims

1. A siphon jet type water flushing toilet, comprising: A bowl portion having a waste receiving surface and an inner edge portion formed along an upper edge portion of the waste receiving surface; An inner edge water spout is formed at the inner edge portion and spouts washing water toward the basin portion; The drainage elbow pipeline is connected to the bottom of the basin, and comprises an ascending pipeline extending upward from the bottom of the basin, a descending pipeline extending downward from the ascending pipeline, and a top portion located between the ascending pipeline and the descending pipeline and defining a sealing water level; A water jet spout is arranged below the bowl portion in a manner of spouting cleaning water toward the inlet of the drain elbow pipe; a water storage tank having a jetting drain valve and storing the cleaning water supplied to the jetting water spout; A jet water conduit connects the water storage tank to the jet water spouting port, and guides the cleaning water in the water storage tank to the jet water spouting port by the water head pressure of the cleaning water in the water storage tank; as well as a control device for controlling the inner edge water spouting from the inner edge water spouting port and the jet water spouting from the jet water spouting port, The jet drain valve includes a valve body, which is arranged at a position lower than the upper surface of the bowl and higher than the sealing water level. The water-washing toilet is configured as follows: Before the jet drain valve is opened, washing water is supplied to the jet conduit to reduce air existing between a valve body of the jet drain valve and a water surface of the jet conduit.

2. The flush toilet according to claim 1, wherein: The water-washing toilet is configured as follows: The control device controls the cleaning water to be continuously ejected from the inner edge water spouting port in sequence as "front inner edge water spouting", "middle inner edge water spouting" and "rear inner edge water spouting", and to perform "jet water spouting" from the jet water spouting port when performing "middle inner edge water spouting".

3. The flush toilet according to claim 1, wherein: After washing water is supplied to the jet water conduit and the water level of the jet water conduit rises to the vicinity of the jet water drain valve to discharge air, the jet water drain valve is opened.

4. The flush toilet according to claim 2, wherein: The water spouting time of the front inner edge water spouting is shorter than the water spouting time of the rear inner edge water spouting.

5. The flush toilet according to claim 1, wherein: The control device performs water supply operation to the water storage tank or opens the jet drainage valve so that the tank water level in the water storage tank is higher than the water level of the water accumulation surface of the bowl during the washing operation.

6. The flush toilet according to claim 5, wherein: When the water level in the bowl rises, the control device opens the jet drain valve so as to reduce the flow rate of the washing water discharged from the water storage tank.

7. The flush toilet according to claim 1, wherein: The flush toilet further includes an exhaust pipe extending from below the valve body of the jet drain valve to above the water stop level in the water storage tank.

8. The flush toilet according to claim 3, wherein: Before the jet drain valve of the water storage tank is opened, the washing water is spouted from the rim water spouting port to raise the water level in the bowl, thereby supplying the washing water to the jet water conduit.

9. The flush toilet according to claim 2, wherein: The total water spouting time of the front inner edge water spouting and the middle inner edge water spouting is shorter than the water spouting time of the rear inner edge water spouting.

10. The flush toilet according to claim 2, wherein: The water stop level of the washing water in the water storage tank is set higher than the upper surface of the bowl.

11. The flush toilet according to claim 2, wherein: The water stop level of the washing water in the water storage tank is set to be lower than the upper surface of the bowl.

12. The flush toilet according to claim 5, wherein: The specific gravity of the jet drain valve is in the range of 1.2 to 1.

4.

13. The flush toilet according to claim 5, wherein: The water level of the washing water in the water storage tank during standby is set above the upper surface of the bowl.

14. The flush toilet according to claim 6, wherein: By setting the pull-up time of the jet drain valve to a predetermined fixed value, the instantaneous flow rate of the washing water discharged from the water storage tank is reduced.

15. The flush toilet according to claim 1, wherein: A water seal having a predetermined water seal level is formed at the lower part of the basin. The water-washing toilet also has a detection unit for detecting the water sealing position. The water jet outlet is located in the sealed water. The water-washing toilet is configured as follows: When the sealing water position is lower than the predetermined sealing water level, washing water is supplied to the bowl to raise the sealing water position, and jet water spouting is performed in this state.

16. The flush toilet according to claim 15, wherein: The detection unit for detecting the water sealing position is a tank water level detection unit for detecting the water level of the water storage tank. The water sealing position is estimated based on the value of the dead water level, the value of the stop water level, or the water supply time required to supply water to the water storage tank to the stop water level detected by the tank water level detection unit.

17. The flush toilet according to claim 16, wherein: The tank water level detection unit is a float switch for detecting the stop water level of the water storage tank.

18. The flush toilet according to claim 15, wherein: The sealing water is replenished by performing the inner edge water spouting before performing the jet water spouting.

19. The flush toilet according to claim 15, wherein: The water tank is also provided with an overflow pipe, which discharges the cleaning water in the water tank to the jet water conduit when the water level in the water tank rises to the water stop level and the water supply time to the water tank becomes longer. The flush toilet replenishes cleaning water in the water tank, and makes the cleaning water flow out from the overflow pipe to the jet water conduit to replenish the sealing water.

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