Flush toilet

Abstract

To provide a siphon jet flush toilet capable of improving waste discharge performance even when the pulling force to the drain trap pipe due to siphon action is small.SOLUTION: A siphon jet flush toilet includes: a bowl; a rim spout water port for spouting washing water to the bowl; a drain trap pipe 8 that is connected to the bowl below the same; a jet spout water port 14 that spouts the washing water toward the entrance of the drain trap pipe; and a water tank that supplies washing water to the jet spout water port. The flush toilet further has a water storage part 22 formed in a lower area of the bowl, and the water storage part includes: a first water level area 50 that is placed between the jet spout water port and the entrance of the drain trap pipe; a second water level area 52 having a concave-shaped shallower than the first water level area, which is formed above the upstream of the jet spout water port; and a third water level area 54 that is connected to the first water level area and the second water level area, spreads in the width direction of the water storage part and is placed above the first water level area and the second water level area. The second water level area is formed extending to the tip 22a of the water storage part.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a flush toilet, and more particularly to a siphon jet type flush toilet. [Background technology]

[0002] Conventionally, siphon jet flush toilets have been widely known in which flush water is discharged from a rim spout to flush the bowl, and flush water is discharged from a jet spout toward a drain trap pipe to induce a siphon, discharging waste by the siphon action. For example, JP 2018-100575 A describes a siphon jet flush toilet in which flush water stored in a tank is sent to a jet waterway by a pump, and high-speed flush water is sprayed from a jet nozzle into a piping trap pipe. The water storage section of this toilet is formed of a curved surface that continues from the waste receiving surface, so waste flows into the drain trap pipe all at once from the waste receiving surface of the bowl.

[0003] Patent Document 2 describes a flush toilet with a recess formed in the water collection area. However, this is a wash-down toilet (a toilet in which waste is flushed away by the running water action caused by the difference in the flush water level), and the waste discharge principle is different from that of a siphon jet toilet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-100575 A [Patent Document 2] JP 2023-50888 A Summary of the Invention [Problem to be solved by the invention]

[0005] The flush toilet in Patent Document 1 mentioned above is a siphon jet type flush toilet that uses a pump to pressurize flush water in a tank and spray it from a jet spout, generating a powerful siphon action to expel waste. On the other hand, when a pump is not used and the head pressure of the wash water in the tank is used to guide the wash water to the jet water outlet, or when an inexpensive, low-power pump is used, the force of pulling the wash water into the drain trap pipe due to the siphon effect is weak. When the pulling force due to the siphon effect is weak, the floating waste in the water reservoir flows into the drain trap pipe all at once, causing problems such as clogging of the pipe. In order to solve the various problems that arise when the pulling force due to the siphon effect is weak, the inventors have conducted extensive research and have come up with the present invention.

[0006] Therefore, the present invention has been made to solve the problems (issues) associated with the conventional technology, and has as its object to provide a siphon jet type flush toilet that can efficiently flow waste from the reservoir into the drain trap pipe, improving waste discharge performance, even when the force pulling the waste into the drain trap pipe due to the siphon action is small. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a siphon jet type flush toilet, comprising: a bowl portion having a waste receiving surface and a rim portion formed along the upper edge of the waste receiving surface; a rim spout formed in the rim portion for spouting flush water into the bowl portion; a drain trap pipe connected below the bowl portion, the drain trap pipe having an ascending pipe extending upward from below the bowl portion, a descending pipe extending downward from the ascending pipe, and a top portion located between the ascending pipe and the descending pipe; a jet spout formed below the bowl portion so as to spout flush water toward an inlet of the drain trap pipe; a flush water supply device for supplying flush water to the jet spout; and a flush water supply system for supplying flush water to the jet spout. The device has a jet water conduit that connects the device to the jet water outlet and guides wash water from the wash water supply device to the jet water outlet, and a water storage section is formed in the lower part of the bowl section, whose water level is determined by the top of the drain trap pipe, and this water storage section has a first water level area located between the jet water outlet and the inlet of the drain trap pipe, a concave second water level area formed above the upstream side of the jet water outlet and with a shallower water level than the first water level area, and a third water level area connected to the first water level area and the second water level area, extending in the width direction of the water storage section and located above the first water level area and the second water level area, and the second water level area is formed extending to the end of the water storage section on the opposite side in the front-to-rear direction to the inlet of the drain trap pipe. In a siphon jet type flush toilet, if the force pulling the waste through the siphon action is weak, the floating waste in the water reservoir will flow into the drain trap pipe all at once, clogging the drain trap pipe and reducing waste discharge performance. Therefore, in the present invention, the water storage section comprises a first water level area located between the jet water outlet and the inlet of the drain trap pipe, a concave-shaped second water level area formed above the upstream side of the jet water outlet and with a shallower water level than the first water level area, and a third water level area connected to the first water level area and the second water level area, extending in the width direction of the water storage section and located above the first water level area and the second water level area, and further, the second water level area is formed extending to the end of the water storage section on the opposite side in the front-to-back direction from the inlet of the drain trap pipe, so that when the discharged waste is discharged, the floating waste on the end side of the water storage surface first falls into the second water level area and flows into the drain trap pipe, and then the floating waste floating in the third water level area flows into the drain trap pipe. In this way, the floating waste can be discharged sequentially into the drain trap pipe, and when siphon action occurs, the floating waste in the reservoir section (especially the third water level area) can be prevented from flowing into the drain trap pipe all at once, thereby improving waste discharge performance.

[0008] In the present invention, the flush water supply device is preferably a water storage tank for storing flush water, the lower part of the water storage tank being located below the upper surface of the rim portion. In the present invention configured in this manner, it is a low-silhouette flush toilet that uses a water storage tank, and even if the head pressure of the flush water is small, it is possible to improve waste discharge performance as described above.

[0009] In the present invention, preferably, the second water level region is sandwiched between the third water level region, is connected to the first water level region with approximately the same width as the first water level region, and extends toward the inlet of the drain trap pipe line. According to the present invention configured in this manner, the second water level area is sandwiched between the third water level area and connected to the first water level area with approximately the same width as the first water level area, and extends toward the inlet of the drain trap pipe, so that floating waste that flows into the second water level area can be smoothly flowed through the first water level area into the drain trap pipe.

[0010] In the present invention, the second water level region preferably has a vertically elongated shape with its front-rear length being greater than its width length. According to the present invention configured in this manner, the second water level area has a vertically elongated shape with its front-to-back length greater than its width-wise length, so that the floating waste is folded vertically and collected, making it easier for it to flow into the entrance of the drain trap pipe.

[0011] In the present invention, the first water level region is preferably provided on the inlet side of the drain trap pipe of the water storage portion, and is arranged in a position collinear with the second water level region in the front-to-rear direction of the toilet in a plan view. According to the present invention configured in this manner, the first water level area is provided on the inlet side of the drain trap pipe of the water storage section, and is arranged in a position that is collinear with the second water level area in the fore-and-aft direction of the toilet when viewed in a plane, so that floating waste in the second water level area flows smoothly and reliably into the first water level area, and the floating waste can be effectively discharged.

[0012] In the present invention, the third water level area is preferably connected to the first water level area and the second water level area in an arc shape, and is formed so that the connection portion between the third water level area and the second water level area is longer than the connection portion between the third water level area and the first water level area. In the present invention configured in this manner, the third water level area is connected to the first water level area and the second water level area in an arc shape, and the connection portion between the third water level area and the second water level area is formed to be longer than the connection portion between the third water level area and the first water level area, so that floating waste can be discharged from the second water level area into the drain trap pipe with a time delay. Effect of the Invention

[0013] With the siphon jet type flush toilet of the present invention, even if the force pulling the waste material into the drain trap pipe due to the siphon action is small, the waste material in the reservoir section can be efficiently caused to flow into the drain trap pipe, improving waste discharge performance. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a plan view showing a flush toilet according to an embodiment of the present invention. [Diagram 2] 2 is a side cross-sectional view taken along line II-II in FIG. 1. [Diagram 3] FIG. 2 is an enlarged side cross-sectional view showing the pool section of the bowl part of a flush toilet according to an embodiment of the present invention. [Figure 4] FIG. 2 is an enlarged plan view showing the water collection section of the bowl part of the flush toilet according to an embodiment of the present invention. [Diagram 5] 5 is a cross-sectional view taken along line VV in FIG. 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] A flush toilet according to an embodiment of the present invention will be described below with reference to the drawings. First, the basic structure of a flush toilet according to this embodiment will be explained with reference to Figures 1 and 2. Figure 1 is a plan view showing a flush toilet according to an embodiment of the present invention, and Figure 2 is a side cross-sectional view taken along line II-II in Figure 1.

[0016] As shown in Figures 1 and 2, the flush toilet 1 of this embodiment is a siphon jet type flush toilet. This flush toilet 1 is equipped with a ceramic toilet body 2, a plastic toilet seat and toilet lid (not shown) placed on the top surface of this toilet body 2, and a water storage tank 4 placed at the upper rear of the toilet body 2 and covered by a plastic cover (not shown).

[0017] The toilet body 2 is formed with a bowl portion 6 for receiving waste, a drain trap pipe 8 provided at the bottom of the bowl portion 6 for discharging waste by siphon action, a rim water outlet 10 for rim water spouting, a rim water conduit 12 for guiding flushing water to the rim water outlet 10, a jet water outlet 14 for jet water spouting, and a jet water conduit 16 for guiding flushing water to the jet water outlet 14.

[0018] The bowl section 6 comprises a bowl-shaped waste receiving surface 18, a rim section 20 formed along the upper edge of the bowl section 6, and a shelf section 21 formed between the waste receiving surface 18 and the rim section 20. The bowl section 6 also comprises a pot section 21 formed in the area below the waste receiving surface 18 and connected to the drain trap pipe 16. A water storage section 22 is formed within this pot section 21, and the water level of this water storage section 22 forms the water sealing surface (water storage surface) W. The water level of this water storage section 22 is determined by the top 8c of the drain trap pipe 8, as described below. The lower part of the above-mentioned water storage tank 4 is located below the rim section 20, resulting in a flush toilet 1 with a low silhouette.

[0019] The drain trap pipeline 8 comprises an inlet portion 8a, an ascending pipeline 8b extending upward from the inlet portion 8a, a descending pipeline 8c extending downward from the ascending pipeline 8b, and a top portion 8d located between the descending pipeline 8c and the ascending pipeline 8b and determining the sealing water level (water level of the reservoir portion 22) of the sealing surface (reservoir surface) W. Here, the lower end of the descending pipe 8c of the drain trap pipe 8 is connected to a drain pipe (not shown) via a drain socket (not shown).

[0020] When looking at the toilet body 2 from the front, the rim spout 10 is formed on the rear left side of the rim portion 20. The rim spout 10 spouts flushing water forward, and this flushing water swirls around the inner circumferential surface of the rim portion 20 and the shelf surface of the shelf portion 21 before flowing down to the waste receiving surface 18 and cleaning the waste receiving surface 18.

[0021] The rim water conduit 12 is formed in a tapered shape with the flow path cross section gradually becoming smaller towards the rim water outlet 10. A water supply hose 23 that is directly connected to a water supply is connected to the upstream side of the rim water conduit 12. Flush water is supplied to the rim water conduit 12 from the water supply, and the flush water is discharged from the rim water outlet 10 by the water supply pressure of the water supply.

[0022] The jet water outlet 14 is formed in the bottom of the bowl portion 6. The jet water outlet 14 is disposed opposite the inlet 8a of the drain trap pipe 8 and is directed toward the inlet 8a of the drain trap pipe 8. The jet water outlet 14 ejects flush water toward the inlet 8a of the drain trap pipe 8, and this flush water flows into the drain trap pipe 8 to activate the siphon action.

[0023] The jet water conduit 16 comprises an upstream flow path 16a extending forward from the water storage tank 4, a curved flow path 16b bending from this upstream flow path, and a downstream flow path 16c extending rearward from this curved flow path and connecting to the jet water outlet 14. Flush water is supplied to the jet water conduit 16 from the water storage tank 4, and the flush water is spouted from the jet water outlet 14 by the head pressure of the flush water.

[0024] The water storage tank 4 is a gravity-fed tank that stores flush water used for jet spouting and supplies it to the jet spout 14. The water storage tank 4 is a small resin tank. The lower part of the water storage tank 4 is positioned below the upper surface of the rim part 20 of the toilet body 2, and above the top 8d of the drain trap pipe 8. This makes the flush toilet 1 a low-silhouette type toilet. In addition, as a wash water source (wash water supply device) that supplies wash water to the jet water outlet 14, in addition to using a gravity-fed water storage tank as shown in this embodiment, an inexpensive low-output pump may be used to supply wash water to the jet water outlet 14.

[0025] Provided within the water storage tank 4 are a water supply device 24 which supplies flush water into the water storage tank 4, a drainage device 26 which supplies or stops the flush water stored in the water storage tank 4 to the jet water conduit 16, and a float switch 28 which detects when the flush water level in the water storage tank 4 has reached the stop water level. Also provided outside the water storage tank 4 is a controller (not shown) which controls the water supply device 24 and drainage device 26 to operate or stop based on an operation signal from the user, and an operation unit (not shown) which transmits an operation signal in response to operation by the user.

[0026] The water supply device 24 comprises a constant flow valve (not shown) connected to a water supply, a rim-side solenoid valve 30 which supplies or stops flush water to the rim spout 10, and a tank-side solenoid valve 34 which supplies or stops flush water to a tank water supply port 32 arranged in the water storage tank 4. The rim-side solenoid valve 30 and the tank-side solenoid valve 34 are designed to be driven by commands from a controller based on operation signals from the user and water level detection signals from the float switch 28.

[0027] The drainage device 26 comprises an overflow pipe 36 that drains overflowing water from the water storage tank 4 into the toilet body, a drain valve 38 fixed to the lower end of the overflow pipe 36, and a toilet flushing unit 40 that opens and closes the drain valve 38 by moving the overflow pipe 36 up and down with an electric driving force. In addition, a guide member 42 that guides the up and down movement of the drain valve 38 is attached to the periphery of the drain outlet 4a of the water storage tank 4. The toilet flushing unit 40 is designed to be driven by commands from a controller based on an operation signal from the user. The drainage device is not limited to the drainage valve shown in this embodiment, and may be a pressure pump, a jet pump, a pressure accumulator pump, or the like instead of the drainage valve.

[0028] The controller is electrically connected to the operation unit, the float switch 28, the rim side solenoid valve 30, the tank side solenoid valve 34, and the toilet flushing unit 40, and is capable of sending and receiving various signals. The controller receives a flush start signal for a large flush or small flush from the operation unit, and drives or stops the rim side solenoid valve 30, the tank side solenoid valve 34, and the toilet flushing unit 40 based on a pre-stored flush sequence.

[0029] Next, the structure and function of the water pool section 22 of the flush toilet 1 according to this embodiment will be explained with reference to Figures 3 to 5. Figure 3 is an enlarged side cross-sectional view showing the water pool section of the bowl section of a flush toilet according to an embodiment of the present invention, Figure 4 is an enlarged plan view showing the water pool section of the bowl section of a flush toilet according to an embodiment of the present invention, and Figure 5 is a cross-sectional view taken along line VV in Figure 4.

[0030] As shown in Figures 3 to 5, the water storage section 22 of the flush toilet 1 has three water level regions formed in the vertical direction. That is, the water storage section 22 is equipped with a first water level region 50 located between the jet water spout 14 and the inlet 8a of the drain trap pipe 8, a second water level region 52 formed above the upstream side of the jet water spout 14 and having a concave shape (see Figure 5) with a shallower water level than the first water level region 50, and a third water level region 54 that is connected to the first water level region 50 and the second water level region 52, spreads in the width direction of the water storage section 22, and is located above the first water level region 50 and the second water level region 52.

[0031] The second water level region 52 extends to the inlet 8a of the drain trap pipe 8 and the tip 22a of the water storage section 22. As shown in Fig. 4, the second water level region 52 is sandwiched between the third water level region 54 and is connected to the first water level region 50 with a width W1 substantially the same as that of the first water level region 50, and extends toward the inlet 8a of the drain trap pipe 8. Furthermore, the second water level region 52 has a vertically elongated shape with its front-to-rear length L1 being greater than its widthwise length W1.

[0032] As shown in Figures 3 and 4, the first water level area 50 is provided on the inlet 8a side of the drain trap pipe 8 of the water storage section 22, and is arranged in a straight line in the front-to-back direction of the toilet bowl in a plan view with the second water level area 52.

[0033] 4 and 5, the third water level region 54 has a length L2 in the front-rear direction, and is connected to the first water level region 50 and the second water level region 52 in an arc shape (convex shape). Furthermore, the length L3 of the connection portion between the third water level region 54 and the second water level region 52 is formed to be longer than the length L4 of the connection portion between the third water level region and the first water level region.

[0034] As shown in FIG. 5, as described above, the second water level region 52 is formed in a concave shape, while the third water level region 54 located on both sides of the second water level region 52 is formed in a convex arc shape.

[0035] Next, the effects and advantages of the flush toilet 1 according to this embodiment will be explained. First, in a siphon jet type flush toilet, if the force pulling the waste through the siphon action is weak, the floating waste in the water collection section will flow into the drain trap pipe all at once, clogging the drain trap pipe and reducing waste discharge performance. Therefore, in the flush toilet 1 of this embodiment, the water storage section 22 is provided with a first water level region 50 located between the jet water outlet 14 and the inlet 8a of the drain trap pipe 8, a concave-shaped second water level region 52 formed above the upstream side of the jet water outlet 14 and with a shallower water level than the first water level region 50, and a third water level region 54 that is connected to the first water level region 50 and the second water level region 52, extends in the width direction of the water storage section 22 and is located above the first water level region 50 and the second water level region 52, and further, the second water level region 52 is formed to extend to the inlet 8a of the drain trap pipe 8 and the tip 22a of the water storage section 22, so that when waste is discharged, the floating waste at the tip side of the water storage surface first falls into the second water level region 52 and flows into the drain trap pipe 8, and then the floating waste floating in the third water level region 54 flows into the drain trap pipe 8. In this way, floating waste can be discharged sequentially into the drain trap pipe 8, and when siphon action occurs, the floating waste in the water storage section 22 (particularly the third water level region 54) can be prevented from flowing into the drain trap pipe 8 all at once, thereby improving waste discharge performance.

[0036] Secondly, the flush toilet 1 according to this embodiment is a low-silhouette flush toilet that uses a water tank 4, and even if the head pressure of the flush water in the water tank 4 is low, waste discharge performance can be improved.

[0037] Thirdly, in the flush toilet 1 of this embodiment, the second water level region 52 is sandwiched between the third water level region 54, and is connected to the first water level region 50 with approximately the same width W1 as the first water level region 50, and extends toward the inlet 8a of the drain trap pipe 8, so that floating waste that flows into the second water level region 52 can be smoothly passed through the first water level region 50 and flow into the drain trap pipe 8.

[0038] Fourthly, in the flush toilet 1 according to this embodiment, the second water level area 52 has an elongated shape with its fore-aft length L1 being greater than its widthwise length W1, so that the floating waste is folded vertically and collected, making it easier for it to flow into the inlet 8a of the drain trap pipe 8.

[0039] Fifth, in the flush toilet 1 of this embodiment, the first water level area 50 is provided on the inlet 8a side of the drain trap pipe 8 of the water storage section 22, and is arranged in a position that is collinear with the second water level area 52 in the fore-and-aft direction of the toilet when viewed in a plane, so that the floating waste in the second water level area 52 flows smoothly and reliably into the first water level area 50, allowing the floating waste to be effectively discharged.

[0040] Sixth, in the flush toilet 1 of this embodiment, the third water level region 54 (with a front-to-rear length of L2) is connected to the first water level region 50 and the second water level region 52 in an arc shape (convex shape), and is formed so that the length L3 of the connection portion between the third water level region 54 and the second water level region 52 is longer than the length L4 of the connection portion between the third water level region 54 and the first water level region 50, so that floating waste can be discharged from the second water level region 52 to the drain trap pipe 8 with a time lag. [Explanation of symbols]

[0041] 1 flush toilet 2 Toilet bowl body 4. Water tank 6 Bowl section 8 Drain trap line 8a Entrance 8b Ascending Pipe 8c descending pipe 8d top 10 Rim Spout 14 Jet outlet 16 Jet Waterway 18 Waste receiving surface 20 Rim section 22 Reservoir 22a Tip 26 Drainage system 50 1st water level area 52 2nd water level area 54 The third water level area W Water sealing surface (water sliding surface)

Claims

1. A siphon jet type flush toilet, a bowl portion having a waste receiving surface and a rim portion formed along an upper edge of the waste receiving surface; A rim spout formed in the rim portion for spouting flush water into the bowl portion; a drain trap pipe connected to a lower portion of the bowl portion, the drain trap pipe including an ascending pipe extending upward from a lower portion of the bowl portion, a descending pipe extending downward from the ascending pipe, and a top portion located between the ascending pipe and the descending pipe; A jet water outlet formed below the bowl portion so as to discharge flush water toward an inlet of the drain trap pipe; a wash water supply device for supplying wash water to the jet outlet; a jet water conduit that connects the flush water supply device and the jet water discharge section and guides flush water from the flush water supply device to the jet water discharge port, A water reservoir is formed below the bowl, the water level of which is determined by the top of the drain trap pipe line, The water storage section includes a first water level region located between the jet water outlet and the inlet of the drain trap pipe, a concave second water level region formed above the upstream side of the jet water outlet and having a shallower water level than the first water level region, and a third water level region connected to the first water level region and the second water level region, extending in the width direction of the water storage section and located above the first water level region and the second water level region, A flush toilet in which the second water level area is formed extending to an end of the water pool portion on the opposite side in the front-to-rear direction from the inlet of the drain trap pipe.

2. 2. The flush toilet according to claim 1, wherein the flush water supply device is a water storage tank that stores flush water, and the lower part of the water storage tank is located below the upper surface of the rim portion.

3. 2. The flush toilet according to claim 1, wherein the second water level region is sandwiched between the third water level region, is connected to the first water level region with approximately the same width as the first water level region, and extends toward the inlet of the drain trap pipe line.

4. 4. The flush toilet according to claim 3, wherein the second water level area has a vertically elongated shape with its front-to-rear length greater than its width length.

5. 2. The flush toilet according to claim 1, wherein the first water level area is provided on the inlet side of the drain trap pipe of the water storage section, and is positioned in the same straight line in the front-to-rear direction of the toilet as the second water level area when viewed in a plan view.

6. 2. The flush toilet of claim 1, wherein the third water level area is connected to the first water level area and the second water level area in an arc shape, and the connection portion between the third water level area and the second water level area is formed to be longer than the connection portion between the third water level area and the first water level area.

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