Water-washable toilet

Abstract

The present invention aims to provide a flush toilet that can suppress the impact noise and energy loss that occur when the flushing water discharged from the jet nozzle collides with the bottom surface of the rising pipe, thereby achieving quieter operation and improving the waste discharge performance. [Solution] The present invention relates to a siphon jet type flush toilet, comprising a bowl section 15, a drain trap pipe 16, a jet outlet 24a, and a jet water channel 22. A flow straightening section 22a is provided downstream of the jet water channel 22 to straighten the direction of the flushing water flow. A first imaginary line L1 extending from the jet outlet 24a along the central axis of this flow straightening section 22a is set to intersect the bottom surface 16e of the rising pipe 16b at an intersection angle α1 of less than 30 degrees.

Description

Technical Field

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

Background Art

[0002] Conventionally, as described in Patent Documents 1 and 2, there is known a siphon jet type flush toilet that generates a siphon action at an early stage and flushes out dirt with the washing water discharged from the jet water outlet. In such a flush toilet, the jet water outlet is provided at a position facing the inlet of the drain trap pipe, and the washing water is discharged from the jet water outlet toward the inlet of the drain trap pipe. The washing water flowing into the drain trap pipe collides with the bottom surface of the rising pipe of the drain trap pipe, and then flows along the bottom surface of the rising pipe.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the flush toilets described in Patent Documents 1 and 2, since the washing water discharged from the jet water outlet collides with the bottom surface of the rising pipe of the drain trap pipe at a large collision angle, there is a problem that a collision sound occurs when the washing water collides with the bottom surface of the rising pipe. In particular, when the accumulated water level in the bowl portion is lowered, a large collision sound occurs when the washing water discharged from the jet water outlet collides with the bottom surface of the rising pipe. Furthermore, if the cleaning water discharged from the jet nozzle collides with the bottom of the rising pipe at a large collision angle, a significant energy loss occurs, weakening the force of the cleaning water and consequently reducing the efficiency of waste discharge.

[0005] Therefore, the present invention has been made to solve the above-mentioned problems of the conventional invention, and aims to provide a flush toilet that can suppress the collision noise and energy loss that occurs when the flushing water discharged from the jet nozzle collides with the bottom surface of the rising pipe, thereby achieving quieter operation and improving the waste discharge performance. [Means for solving the problem]

[0006] To achieve the above-mentioned objectives, the present invention provides a siphon jet type flush toilet comprising: a bowl portion having a waste receiving surface for receiving waste and a rim portion formed above the waste receiving surface; a drain trap pipe comprising an upward-extending upward-extending upward-extending upward-extending upward-extending upward-extending upward-extending downward

[0007] In the present invention configured as described above, a flow straightening section is provided downstream of the jet water conduit to adjust the direction of the flow of the cleaning water. The central axis of this flow straightening section is set to intersect the bottom surface of the riser pipe at an angle of less than 30 degrees with respect to the bottom surface of the riser pipe. As a result, the main stream of cleaning water discharged from the jet outlet collides with the bottom surface of the riser pipe at a small collision angle, thereby suppressing the collision noise and energy loss that occur when the cleaning water discharged from the jet outlet collides with the bottom surface of the riser pipe. This makes it possible to achieve quieter operation and improve the performance of waste discharge.

[0008] In the present invention, preferably, the second imaginary line extending from the jet outlet to the upper surface of the rectifier section is set to intersect the bottom surface of the riser pipeline at an intersection angle of less than 30 degrees. In the present invention configured as described above, the second imaginary line extending from the jet outlet to the upper surface of the flow straightening section is set to intersect the bottom surface of the rising pipeline at an intersection angle of less than 30 degrees. This allows the main stream of cleaning water discharged from the jet outlet to collide with the bottom surface of the rising pipeline at a small collision angle.

[0009] Furthermore, in the present invention, preferably, the intersection point where the first imaginary line crosses the bottom surface of the riser pipeline is located downstream of the lowest end of the bottom surface of the riser pipeline. In the present invention configured in this way, the intersection point where the first imaginary line crosses the bottom surface of the riser pipe is located downstream of the lowest end of the bottom surface of the riser pipe. Therefore, the collision point where the main stream of flushing water discharged from the jet outlet collides with the bottom surface of the riser pipe can be located further inside the drain trap pipe than the entrance, thus suppressing the leakage of collision noise to the outside of the toilet bowl.

[0010] In the present invention, preferably, the lowest end of the bottom surface of the riser pipe is located downstream of the lowest end of the top surface of the riser pipe. In the present invention configured in this way, the lowest end of the bottom surface of the riser pipe is located downstream of the lowest end of the top surface of the riser pipe. Therefore, the point where the main stream of flushing water discharged from the jet outlet collides with the bottom surface of the riser pipe can be made further back than the entrance to the drain trap pipe, thus suppressing the leakage of collision noise to the outside of the toilet bowl.

[0011] Furthermore, in the present invention, preferably, the central axis of the riser conduit is curved so as to be concave downwards. In the present invention configured in this way, the central axis of the riser pipe is curved so as to be concave downwards, which makes it possible to reduce the collision angle at which the main stream of cleaning water discharged from the jet outlet collides with the bottom surface of the riser pipe.

[0012] In the present invention, preferably, the bottom surface of the riser conduit has a curved surface that curves downwards. In the present invention configured in this way, the bottom surface of the riser pipe has a curved surface that curves downward, so that the collision angle at which the main stream of cleaning water discharged from the jet outlet collides with the bottom surface of the riser pipe can be made smaller. [Effects of the Invention]

[0013] According to the flush toilet of the present invention, the collision noise and energy loss that occur when the flushing water discharged from the jet nozzle collides with the bottom surface of the rising pipe can be suppressed, thereby achieving quieter operation and improving the waste discharge performance. [Brief explanation of the drawing]

[0014] [Figure 1] This is a perspective view of a flush toilet according to an embodiment of the present invention. [Figure 2] This is an overall diagram of a flush toilet according to an embodiment of the present invention. [Figure 3] This is a block diagram showing the configuration related to the control unit of a flush toilet according to an embodiment of the present invention. [Figure 4]It is a side cross-sectional view of a water-washing toilet according to an embodiment of the present invention. [Figure 5] It is a partially enlarged view near the drain trap pipeline of FIG. 4. [Figure 6A] It is a cross-sectional view taken along line A-A of FIG. 4. [Figure 6B] It is a cross-sectional view taken along line B-B of FIG. 4. [Figure 6C] It is a cross-sectional view taken along line C-C of FIG. 4. [Figure 6D] It is a cross-sectional view taken along line D-D of FIG. 4. [Figure 7] It is a view showing how the washing water discharged from the jet water outlet of the water-washing toilet according to the embodiment of the present invention flows through the drain trap pipeline.

Embodiments for Carrying out the Invention

[0015] Hereinafter, a water-washing toilet according to an embodiment of the present invention will be described with reference to the accompanying drawings. First, the overall configuration of the water-washing toilet according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view of a water-washing toilet according to an embodiment of the present invention, FIG. 2 is an overall configuration diagram of a water-washing toilet according to an embodiment of the present invention, and FIG. 3 is a block diagram showing a configuration related to the control unit of a water-washing toilet according to an embodiment of the present invention.

[0016] As shown in FIGS. 1 and 2, the water-washing toilet 1 according to the embodiment of the present invention is a siphon jet type toilet, and includes a ceramic toilet body 2, a local cleaning device 4 disposed on the upper surface of the toilet body 2, a valve unit 6 for supplying washing water to the toilet body 2, a water storage tank 8 for storing washing water, and a pressure pump 10 for supplying the washing water stored in the water storage tank 8 to the toilet body 2.

[0017] The toilet bowl body 2 has a bowl section 15 comprising a bowl-shaped waste receiving surface 12 for receiving waste and a rim section 14 formed above the waste receiving surface 12, and a drain trap pipe 16 connected to the bottom of the bowl section 15 for discharging waste. A rim water channel 18 is formed inside the rim section 14, and a rim water outlet 20a is formed at the downstream end of the rim water channel 18, which is the rim water outlet section 20 for discharging water from the rim. The rim water outlet 20a is formed on the right front of the bowl section 15 when viewed from the front of the flush toilet 1, and is designed to discharge flushing water backward, forming a swirling flow along the inner circumferential surface of the rim section 14.

[0018] Furthermore, a jet water channel 22 is formed below the toilet bowl body 2, and a jet outlet 24a is formed at the jet water discharge section 24, which is the downstream end of this jet water channel 22, to discharge water in a jet. The jet outlet 24a is located below the bowl section 15 and is positioned facing the inlet 16a of the drain trap pipe 16, so as to discharge flushing water toward the inlet 16a of the drain trap pipe 16.

[0019] The drain trap pipe 16 consists of an inlet 16a, an ascending pipe 16b that rises from the inlet 16a, and a descending pipe 16c that descends from the ascending pipe 16b, with the top 16d located between the ascending pipe 16b and the descending pipe 16c. A drain socket 26 is connected to the lower end of the descending pipe 16c of the drain trap pipe 16.

[0020] As shown in Figure 1, the local cleaning device 4 comprises a main body 4a, a cleaning nozzle 4b that is movable forward and backward from the main body 4a, a toilet seat 4c that is rotatably attached to the main body 4a, and a toilet lid 4d that is rotatably attached to the main body 4a so as to cover the toilet seat 4c.

[0021] As shown in Figure 2, the valve unit 6 is equipped with a main water supply channel 30 from which flushing water is supplied from the water pipe 28, which is the source of flushing water. This main water supply channel 30 is equipped with a constant flow valve 38, a diaphragm-type solenoid valve 40, and a water supply channel switching valve 42, from the upstream side. Furthermore, the main water supply channel 30 upstream of the valve unit 6 is equipped with a stopcock 32, a strainer 34, and a branch fitting 36, from the upstream side. The main water supply channel 30 consists of a water supply hose that connects to the water pipe 28 outside the toilet.

[0022] Furthermore, a rim-side water supply channel 44 for supplying cleaning water to the rim outlet 20a and a tank-side water supply channel 46 for supplying cleaning water to the water storage tank 8 are connected to the downstream side of the water supply channel switching valve 42. A rim water conduit 18 is connected to the downstream end of the rim-side water supply channel 44, so that cleaning water is supplied to the rim outlet 20a by the water supply pressure of the waterworks.

[0023] The constant flow valve 38 is used to restrict the flow rate of the cleaning water that flows in via the stopcock 32, strainer 34, and branch fitting 36 to below a predetermined flow rate. The cleaning water that has passed through the constant flow valve 38 flows into the electromagnetic valve 40, and the cleaning water that has passed through the electromagnetic valve 40 is supplied by the water supply channel switching valve 42 to the rim outlet 20a from the rim-side water supply channel 44, which is on the rim side, or to the water storage tank 8 from the tank-side water supply channel 46, which is on the tank side.

[0024] The water supply channel switching valve 42 is a switching valve that can supply cleaning water to both the rim-side water supply channel 44 and the tank-side water supply channel 46 at the same time, and can arbitrarily change the ratio of the amount and flow rate of water supplied to the rim side and the tank side. The water supply channel switching valve 42 is equipped with a rotor (not shown) for changing the ratio of the amount and flow rate of water supplied to the rim side and the tank side, and this rotor is driven to a desired position by a motor (not shown).

[0025] A pump-side water supply channel 48 is connected to the lower part of the water storage tank 8, and a pressurizing pump 10 equipped with a pump chamber is connected to the downstream end of this pump-side water supply channel 48. Furthermore, the pressurizing pump 10 and the jet water conduit 22 are connected by a jet-side water supply channel 50, and the pressurizing pump 10 pressurizes the cleaning water stored in the water storage tank 8 and supplies it to the jet outlet 24a.

[0026] The pressurizing pump 10 is configured to pressurize the cleaning water stored in the water storage tank 8 and discharge it from the jet outlet 24a at a predetermined flow rate. The pressurizing pump 10 is connected to the pump-side water supply channel 48 on its upstream side and to the jet-side water supply channel 50 on its downstream side. The pressurizing pump 10 comprises a casing 10a, an impeller 10b which is a vane that is rotatable in both forward and reverse directions within the casing, and a motor 10c which rotates the impeller 10b. It is a centrifugal pump that uses the centrifugal force generated by the rotation of the impeller 10b to pressurize the cleaning water in the water storage tank 8.

[0027] A vacuum breaker 52, which acts as a check valve, is provided in the rim-side water supply channel 44, and a vacuum breaker 54, which acts as a check valve, is also provided in the tank-side water supply channel 46. These vacuum breakers prevent backflow from the rim outlet 20a and the water storage tank 8. Furthermore, the wash water that overflows from the atmospheric vent of the vacuum breaker 52 in the rim-side water supply channel 44 flows into the water storage tank 8 through the return pipe 55.

[0028] The water storage tank 8 is a sealed type water storage tank, and a ball-type check valve 56 is provided at the connection between the tank-side water supply channel 46 and the water storage tank 8, and a ball-type check valve 58 is also provided at the connection between the return pipe 55 and the water storage tank 8. These ball-type check valves prevent backflow of the cleaning water even when the water storage tank 8 is full, exceeding the upper limit of the overflow channel.

[0029] A drain valve 62 is provided at the bottom of the water storage tank 8. This drain valve 62 is located below the pressure pump 10, and by opening the drain valve 62 during maintenance, the cleaning water inside the water storage tank 8 and the pressure pump 10 can be drained.

[0030] An upper float switch 64 and a lower float switch 66 are located inside the water storage tank 8. The upper float switch 64 switches to the ON state when the water level in the water storage tank 8 reaches a predetermined position L2 that is slightly lower than the maximum water level L3 during normal use, and the control unit 74 detects this and closes the electromagnetic valve 40. The lower float switch 66 switches to the ON state when the water level in the water storage tank 8 drops to the minimum water level L1 during normal use, and the control unit 74 detects this and stops the pressurizing pump 10.

[0031] Furthermore, an overflow channel 60 for draining excess cleaning water is provided inside the water storage tank 8. The upper end of this overflow channel 60 opens into the water storage tank 8, and its lower end is connected to the jet-side water supply channel 50. A flapper valve 67, which is a check valve, is installed in this overflow channel 60 to prevent backflow from the jet outlet 24a.

[0032] As shown in Figures 1 and 2, the flush toilet 1 includes a seating sensor 68 for detecting the user's sitting motion, a line sensor 70 for detecting the type and amount of waste after the user's excretion, and a control unit 74 that controls the pressurizing pump 10 based on the detection results detected by the line sensor 70.

[0033] The seating sensor 68 is located on the underside of the left rear of the toilet seat 4c of the local washing device 4. The seating sensor 68 is a load sensor that detects the user's weight. The seating sensor 68 is configured to detect changes in weight when the user is seated on the toilet seat 4c, and to detect the start and end of defecation by the user.

[0034] The line sensor 70 is mounted on the main body 4a of the local cleaning device 4, facing into the bowl section 15, and is configured to detect the type and amount of waste that falls into the bowl section 15. The line sensor 70 consists of multiple light-receiving elements arranged in a straight line, and is configured to acquire one-dimensional data (linear still images) over time at predetermined time intervals. The acquired one-dimensional data is arranged in a time series by the control unit 74 to generate a single two-dimensional image, which is used to determine the type and amount of waste.

[0035] As shown in Figure 3, the control unit 74 is electrically connected to the upper float switch 64, the lower float switch 66, the seat sensor 68, the line sensor 70, the toilet flush switch 76, the electromagnetic switch 40, the water supply channel switching valve 42, and the pressure pump 10, and is configured to communicate with various devices. When the toilet flush switch 76 is pressed, the control unit 74 sequentially operates the electromagnetic switch 40, the water supply channel switching valve 42, and the pressure pump 10, so that flushing water is first discharged from the rim outlet 20a, then flushing water is discharged from the jet outlet 24a while flushing water is being discharged from the rim outlet 20a, and finally flushing water is discharged from the rim outlet 20a.

[0036] The control unit 74 is configured to generate a single two-dimensional image by arranging multiple one-dimensional data acquired from the line sensor 70 in a time series, and to determine the type and amount of waste that has fallen into the bowl section 15. Furthermore, for each toilet flush, the control unit 74 is configured to control the pressurizing pump 10 based on the determination result of the type and amount of waste, and to change the instantaneous flow rate and discharge time of the flushing water discharged from the jet nozzle 24a.

[0037] Next, the drain trap pipe 16 of the flush toilet 1 according to an embodiment of the present invention will be described in detail with reference to Figures 4, 5, and 6A to 6D. Figure 4 is a side cross-sectional view of a flush toilet according to an embodiment of the present invention, Figure 5 is a partially enlarged view of the area near the drain trap pipe in Figure 4, and Figures 6A to 6D are cross-sectional views taken along lines AA to DD in Figure 4.

[0038] As shown in Figures 4 and 5, a flow straightening section 22a is provided downstream of the jet water conduit 22 to adjust the direction of the flow of the cleaning water. The flow straightening section 22a has a substantially constant flow path cross-sectional area and extends in a straight line. The flow straightening section 22a is inclined downward toward the inlet 16a of the drain trap pipe 16.

[0039] As shown in Figure 5, the first imaginary line L1, which extends from the jet outlet 24a along the central axis of the flow straightening section 22a, is set to intersect with the bottom surface 16e of the riser pipe 16b of the drain trap pipe 16. The intersection angle α1 (the smaller angle between the first imaginary line L1 and the bottom surface 16e of the riser pipe 16b) where the first imaginary line L1 intersects with the bottom surface 16e of the riser pipe 16b is set to approximately 15 degrees. This allows the main stream (a bundle of flow) of the flushing water discharged from the jet outlet 24a to collide with the bottom surface 16e of the riser pipe 16b at a small collision angle, thereby suppressing the collision noise and energy loss that occur when the flushing water discharged from the jet outlet 24a collides with the bottom surface 16e of the riser pipe 16b, compared to conventional flush toilets.

[0040] In this embodiment, the intersection angle α1 is set to approximately 15 degrees, but if the intersection angle α1 is set to less than 30 degrees, collision noise and energy loss can be suppressed as described above. Note that if the intersection angle α1 is 0 degrees, the force that washes away dirt by the washing water discharged from the jet nozzle 24a weakens, so it is preferable to set the intersection angle α1 to a value greater than 0 degrees.

[0041] As shown in Figure 5, a second imaginary line L2 extending from the jet outlet 24a along the upper surface of the rectifier section 22a is set to intersect with the bottom surface 16e of the riser pipe 16b of the drain trap pipe 16. The intersection angle α2 (the smaller angle between the second imaginary line L2 and the bottom surface 16e of the riser pipe 16b) where the second imaginary line L2 intersects with the bottom surface 16e of the riser pipe 16b is set to approximately 18 degrees. This allows the main stream of cleaning water discharged from the jet outlet 24a to collide with the bottom surface 16e of the riser pipe 16b at a small collision angle. In this embodiment, the intersection angle α2 is set to approximately 18 degrees, but if it is set to less than 30 degrees, the main stream of cleaning water discharged from the jet outlet 24a can also collide with the bottom surface 16e of the riser pipe 16b at a small collision angle.

[0042] As shown in Figure 5, the bottom surface 16e of the riser pipe 16b has a curved surface 16f that curves downward in a side cross-sectional view. The curved surface 16f is formed to form a circular arc with a relatively large radius of curvature. The curved surface 16f is formed from near the inlet 16a of the drain trap pipe 16 to near the middle of the riser pipe 16b. As shown in Figures 6A to 6D, the curved surface 16f is formed to curve downward in a front cross-sectional view and is formed to form a circular arc. Because the curved surface 16f is formed on the bottom surface 16e of the riser pipe 16b, the central axis CL of the riser pipe 16b is curved downward in a recess (see Figure 5).

[0043] As shown in Figure 5, the intersection point P1 where the first imaginary line L1 intersects the bottom surface 16e of the riser pipe 16b is located downstream of the lowest end 16g of the bottom surface 16e of the riser pipe 16b. Similarly, the intersection point P2 where the second imaginary line L2 intersects the bottom surface 16e of the riser pipe 16b is located downstream of the lowest end 16g of the bottom surface 16e of the riser pipe 16b. Furthermore, the lowest end 16g of the bottom surface 16e of the riser pipe 16b is located downstream of the lowest end 16i of the top surface 16h of the riser pipe 16b. As a result, the cleaning water discharged from the jet outlet 24a collides with the bottom surface 16e of the riser pipe 16b further inside the drain trap pipe 16 than the inlet 16a.

[0044] Next, with reference to Figure 7, the flow (operation) of the flushing water discharged from the jet nozzle in a flush toilet according to an embodiment of the present invention will be explained. Figure 7 shows how flushing water discharged from the jet nozzle of a flush toilet according to an embodiment of the present invention flows through the drain trap pipe.

[0045] First, when the toilet flushing switch 76 is pressed by the user, the pressure pump 10 is activated, and flushing water stored in the water storage tank 8 is supplied to the jet water supply channel 22 via the jet side water supply channel 50. The flushing water supplied to the jet water supply channel 22 passes through the flow straightening section 22a located downstream of the jet water supply channel 22 and is discharged from the jet outlet 24a. At this time, as the flushing water passes through the flow straightening section 22a, a main flow (a bundled flow) is formed in which the direction of the flushing water flow is straightened.

[0046] The main stream F1 of the cleaning water discharged from the jet outlet 24a collides with the bottom surface 16e of the rising pipe 16b of the drain trap pipe 16 at the collision position P1 (intersection P1). At this time, the main stream F1 of the cleaning water discharged from the jet outlet 24a collides with the bottom surface 16e of the rising pipe 16b at a small collision angle β1 of less than 30 degrees. Therefore, the collision noise and energy loss that occur when the cleaning water discharged from the jet outlet 24a collides with the bottom surface 16e of the rising pipe 16b can be suppressed.

[0047] Next, the main flow F1 collides with the bottom surface 16e of the rising pipe 16b and then flows along the bottom surface of the rising pipe 16b (main flow F2). Subsequently, the main flow F2 flows over the top surface 16d of the drain trap pipe 16 and is discharged from the descending pipe 16c.

[0048] Next, the effects and advantages of the flush toilet 1 according to the embodiment of the present invention described above will be explained. First, in the flush toilet 1 according to an embodiment of the present invention, a flow straightening section 22a is provided downstream of the jet water conduit 22 to straighten the direction of the flow of flushing water. The central axis of this flow straightening section 22a is set to intersect the bottom surface 16e of the riser pipe 16b at an intersection angle α1 of less than 30 degrees. As a result, the main stream F1 of the flushing water discharged from the jet water conduit 24a collides with the bottom surface 16e of the riser pipe 16b at a small collision angle β1. This suppresses the collision noise and energy loss that occur when the flushing water discharged from the jet water conduit 24a collides with the bottom surface 16e of the riser pipe 16b. This makes it possible to achieve quieter operation and improve the waste discharge performance.

[0049] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the second imaginary line L2 extending from the jet outlet to the upper surface of the rectifier section 22a is set to intersect the bottom surface 16e of the riser pipe 16b at an intersection angle α2 of less than 30 degrees. This allows the main stream F1 of the flushing water discharged from the jet outlet 24a to collide with the bottom surface 16e of the riser pipe 16b at a small collision angle β1.

[0050] In the flush toilet 1 according to an embodiment of the present invention, the intersection point P1 where the first imaginary line L1 intersects the bottom surface 16e of the riser pipe 16b is located downstream of the lowest end 16g of the bottom surface 16e of the riser pipe 16b. Therefore, the collision position P1 where the main stream F1 of the flushing water discharged from the jet outlet 24a collides with the bottom surface 16e of the riser pipe 16b can be located further inside the drain trap pipe 16 than the inlet 16a, thereby suppressing the leakage of collision noise to the outside of the toilet body 2.

[0051] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the lowest end 16g of the bottom surface 16e of the riser pipe 16b is located downstream of the lowest end 16i of the top surface 16h of the riser pipe 16b. Therefore, the collision position P1 where the main stream F1 of the flushing water discharged from the jet outlet 24a collides with the bottom surface 16e of the riser pipe 16b can be made further back than the inlet 16a in the drain trap pipe 16, thereby suppressing the leakage of collision noise to the outside of the toilet body 2.

[0052] In the flush toilet 1 according to an embodiment of the present invention, the central axis CL of the riser pipe 16b is curved so as to be concave downwards, which makes it possible to reduce the collision angle β1 at which the main stream F1 of the flushing water discharged from the jet outlet 24a collides with the bottom surface 16e of the riser pipe 16b.

[0053] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the bottom surface 16e of the riser pipe 16b has a curved surface 16f that curves downward, so that the collision angle β1 at which the main stream F1 of the flushing water discharged from the jet outlet 24a collides with the bottom surface 16e of the riser pipe 16b can be made smaller.

[0054] The present invention is not limited to the embodiments described above, and various modifications and variations are possible within the scope of the technical idea described in the claims. [Explanation of Symbols]

[0055] 1: Flush toilet 12: Waste receiving surface 14: Rim section 15: Bowl Section 16: Drain trap pipe 16a: Inlet of drain trap pipe 16b: Rising pipe for drain trap piping 16c: Downward pipe for drain traps 16d: Top of the drain trap pipe 16e: Bottom of the rising pipeline 16f: Curved surface at the bottom of the rising pipeline 16g: The lowest point at the bottom of the rising pipe. 16h: Top surface of the rising pipeline 16i: The lowest point on the upper surface of the rising pipeline. 22: Jet water conduit 22a: Rectifier section 24a: Jet nozzle CL: Central axis of the ascending pipeline L1: First virtual line L2: Second virtual line P1: Intersection (collision position) P2: Intersection α1: Angle of intersection between the first virtual line and the bottom surface of the ascending pipe. α2: Angle of intersection between the second virtual line and the bottom surface of the ascending pipe. β1: Collision angle

Claims

1. It is a siphon jet type flush toilet, A bowl portion comprising a waste receiving surface for receiving waste, and a rim portion formed above the waste receiving surface, A drain trap pipe includes a rising pipe located below the bowl section and extending upward, a descending pipe extending downward from the rising pipe, and a top section located between the descending pipe and the rising pipe. A jet outlet is provided below the bowl section and discharges cleaning water toward the entrance of the drain trap pipe, A jet water channel that guides the cleaning water to the above-mentioned jet outlet, It has, Downstream of the above-mentioned jet water channel, a flow straightening section is provided to adjust the direction of the flow of the cleaning water. A flush toilet characterized in that the first imaginary line, which extends from the jet outlet to the central axis of the rectifier section, is set to intersect the bottom surface of the riser pipe at an angle of less than 30 degrees.

2. The flush toilet according to claim 1, wherein a second imaginary line extending from the jet outlet to the upper surface of the rectifier section is set to intersect the bottom surface of the riser pipe at an angle of less than 30 degrees.

3. The flush toilet according to claim 1 or 2, wherein the intersection point where the first imaginary line intersects the bottom surface of the riser pipe is located downstream of the lowest end of the bottom surface of the riser pipe.

4. The flush toilet according to claim 3, wherein the lowest end of the bottom surface of the riser pipe is located downstream of the lowest end of the top surface of the riser pipe.

5. The flush toilet according to claim 1, wherein the central axis of the above-mentioned rising pipe is curved so as to be concave downwards.

6. The flush toilet according to claim 5, wherein the bottom surface of the above-mentioned rising pipe has a curved surface that curves downward.

Images