Water-washable toilet

Abstract

To provide a flush toilet capable of improving the waste discharge performance by providing enough jet spout water to drain waste with a compact jet waterway.SOLUTION: A siphon jet flush toilet 1 includes: a bowl 6; a rim spout water port 20; a drain trap pipe 8; a jet spout water port 14; a washing water source; a jet waterway 16; and a buffer portion 50. The jet waterway 16 includes: an upstream flow path 16a extending forward from the washing water source; a curved flow path 16b curved from the upstream flow path 16a; and a downstream flow path 16c that extends backward from the curved flow path 16b and is connected to the jet spout water port 14. The jet waterway 16 and / or the buffer portion 50 is configured so that the washing water spout from the jet spout water port 14 flows toward the center of the inlet 8a of the drain trap pipe 8.SELECTED DRAWING: Figure 5

Description

Technical Field

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

Background Art

[0002] Conventionally, as described in Patent Document 1, there is known a siphon jet type flushing toilet that discharges washing water from a jet outlet and generates a siphon action in a drain trap pipe to discharge dirt. In this flushing toilet, the jet water conduit extends forward from the drain outlet of the water storage tank, then bends and extends backward toward the jet outlet. Further, the jet water conduit is largely eccentric with respect to the central axis of the jet outlet in order to make the flow velocity distribution of the washing water discharged from the jet outlet uniform, and bends at a sharp angle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, a flushing toilet such as that of Patent Document 1 has a problem that since the jet water conduit is largely eccentric, a large space is required to install the jet water conduit, and the entire toilet becomes large. Further, since the jet water conduit bends at a sharp angle, the washing water flowing through the jet water conduit is subject to a large energy loss. For this reason, sufficient jet water discharge for discharging dirt cannot be performed, and as a result, there is a problem that the dirt discharge performance deteriorates.

[0005] Therefore, the present invention has been made to solve the above-mentioned problems, and aims to provide a flush toilet that can make the jet water channel compact, produce a jet of water sufficient to discharge waste, and improve waste discharge performance. [Means for solving the problem]

[0006] To achieve the above objective, the present invention provides a siphon jet type flush toilet comprising: a bowl portion having a bowl-shaped waste receiving surface and a rim portion formed on its upper edge; a rim outlet provided on the rim portion for discharging flushing water toward the bowl portion; a drain trap pipe provided at the bottom of the bowl portion and including an upward-extending upward-extending upward-extending upward-extending upward-extending downward-extending downward-extending upward-extending downward-extending downward-extending downward-extending downward-extending downward-extending upward The system comprises a water purification source, a jet water channel connecting the washing water source and the jet outlet to supply washing water from the washing water source to the jet outlet, and a buffer section provided at the bottom of the bowl section that connects the jet outlet to the inlet of the drain trap pipe. The jet water channel has an upstream channel extending forward from the washing water source, a bent channel bending from this upstream channel, and a downstream channel extending backward from this bent channel and connecting to the jet outlet. The jet water channel and / or buffer section are configured such that the washing water discharged from the jet outlet flows toward the center of the inlet of the drain trap pipe. In the present invention configured as described above, the jet water conduit and / or buffer section is configured such that the cleaning water discharged from the jet outlet flows toward the center of the inlet of the drain trap pipe. Therefore, even if the jet water conduit is made compact, cleaning water can be discharged from the jet outlet toward the center of the inlet of the drain trap pipe. Thus, the jet water conduit can be made compact while providing sufficient jet discharge to remove waste, thereby improving waste discharge performance.

[0007] In the present invention, preferably, in a top view, the inner circumferential surface of the bent channel of the jet water conduit has a smaller radius of curvature on the downstream side than on the upstream side. In the present invention configured in this way, when viewed from above, the inner circumferential surface of the bent channel of the jet water conduit has a smaller radius of curvature on the downstream side than on the upstream side. Since the inner circumferential surface on the downstream side of the bent channel, where stagnation occurs, is formed with a relatively small radius of curvature, the bent channel can be made compact while suppressing energy loss.

[0008] Furthermore, in the present invention, preferably, the outer surface of the bent channel of the jet water conduit has a radius of curvature on the downstream side that is larger than the radius of curvature on the upstream side when viewed from above. In the present invention configured in this way, when viewed from above, the outer surface of the bent channel of the jet water conduit has a larger radius of curvature on the downstream side than on the upstream side. Since the outer surface of the downstream side of the bent channel, through which a relatively large amount of cleaning water flows, is formed with a relatively large radius of curvature, it is possible to maintain the flow velocity while flowing, and the occurrence of flow separation on the outer surface of the bent channel can be suppressed.

[0009] In the present invention, preferably, the bottom surface of the bent channel of the jet water conduit is formed to be substantially horizontal, the upper surface of the bent channel slopes downward from the upstream side to the downstream side, and the height of the upper surface of the bent channel is higher on the outer surface side than on the inner surface side. In the present invention configured as described above, the bottom surface of the bent channel of the jet water conduit is formed almost horizontally, the top surface of the bent channel slopes downward from the upstream side to the downstream side, and the height of the top surface of the bent channel is higher on the outer surface side than on the inner surface side. As a result, the cross-sectional area of ​​the channel of the bent channel is made larger on the outer surface side than on the inner surface side, and flow separation can be suppressed on the outer surface side where a relatively large amount of cleaning water flows.

[0010] Furthermore, in the present invention, preferably, the jet water channel is configured such that, in a top view, the position of the main stream of cleaning water passing through the jet outlet is substantially coaxial with the center of the buffer section and the center of the drain trap pipe. In the present invention configured as described above, the jet water channel is configured such that, in a top view, the position of the main stream of cleaning water passing through the jet outlet is approximately coaxial with the center of the buffer section and the center of the drain trap pipe. Therefore, cleaning water can be discharged from the jet outlet toward the center of the inlet of the drain trap pipe.

[0011] In the present invention, preferably, in a top view, the radius of curvature on the inner circumferential surface side of the upstream end of the buffer portion is smaller than the radius of curvature on the outer circumferential surface side. In the present invention configured as described above, in a top view, the radius of curvature on the inner circumferential surface of the upstream end of the buffer section is smaller than the radius of curvature on the outer circumferential surface. Therefore, the cleaning water discharged from the jet outlet is attracted to the inner circumferential surface with the relatively smaller radius of curvature and flows towards the center of the inlet of the drain trap pipe.

[0012] Furthermore, in the present invention, preferably, the radius of curvature of the connecting portion that connects the jet water conduit and the buffer portion is smaller than the radius of curvature of the inner circumference of the upstream end of the buffer portion. In the present invention configured in this way, the radius of curvature of the connecting portion that connects the jet water channel and the buffer portion is smaller than the radius of curvature of the inner circumference of the upstream end of the buffer portion, so that flow separation can be suppressed when water is discharged from the jet outlet.

[0013] In the present invention, preferably, the distance from the lower end of the jet outlet to the inlet of the drain trap pipe is shorter than the distance from the upper end of the jet outlet to the inlet of the drain trap pipe. In the present invention configured as described above, the distance from the lower end of the jet outlet to the inlet of the drain trap pipe is shorter than the distance from the upper end of the jet outlet to the inlet of the drain trap pipe. Therefore, the area where the buffer portion is formed can be reduced, and the energy loss that the washing water discharged from the jet outlet receives when passing through the buffer portion can be reduced.

[0014] Also, in the present invention, preferably, the bent flow path is arranged within the water-sealing region in a top view. In the present invention configured as described above, since the bent flow path is arranged within the water-sealing region, the jet water conduit can be made compact. Also, the bent flow path can always be in a full-water state, and the retention of air within the bent flow path can be suppressed.

Effects of the Invention

[0015] According to the water-washing toilet of the present invention, it is possible to provide a water-washing toilet that can make the jet water conduit compact, perform jet water discharge sufficient for discharging dirt, and improve the discharge performance of dirt.

Brief Description of the Drawings

[0016] [Figure 1] It is a plan view showing a water-washing toilet according to a first embodiment of the present invention. [Figure 2] It is a side cross-sectional view taken along the line II-II of FIG. 1. [Figure 3] It is a perspective view showing the entire jet water conduit according to a first embodiment of the present invention. [Figure 4] It is a partially enlarged view of the jet outlet portion of the water-washing toilet according to a first embodiment of the present invention shown in FIG. 2. [Figure 5] It is a plan cross-sectional view taken along the line V-V of FIG. 2. [Figure 6A] It is a view showing the flow path cross-section A of the jet water conduit of the water-washing toilet according to a first embodiment of the present invention shown in FIG. 5. [Figure 6B]It is a diagram showing the flow path cross-section B of the jet water guide path of the flushing toilet according to the first embodiment of the present invention shown in FIG. 5. [Figure 6C] It is a diagram showing the flow path cross-section C of the jet water guide path of the flushing toilet according to the first embodiment of the present invention shown in FIG. 5. [Figure 6D] It is a diagram showing the flow path cross-section D of the jet water guide path of the flushing toilet according to the first embodiment of the present invention shown in FIG. 5. [Figure 6E] It is a diagram showing the flow path cross-section E of the jet water guide path of the flushing toilet according to the first embodiment of the present invention shown in FIG. 5. [Figure 6F] It is a diagram showing the flow path cross-section F of the jet water guide path of the flushing toilet according to the first embodiment of the present invention shown in FIG. 5. [Figure 6G] It is a diagram showing the flow path cross-section G of the jet water guide path of the flushing toilet according to the first embodiment of the present invention shown in FIG. 5. [Figure 7] It is a diagram for explaining the flushing operation of the flushing toilet according to the first embodiment of the present invention. [Figure 8A] It is a diagram showing the instantaneous flow rate of the flushing water discharged from the jet water outlet in the large flushing of the flushing toilet according to the first embodiment of the present invention and the instantaneous flow rate of the flushing water flowing into the inlet of the drain trap pipe. [Figure 8B] It is a diagram showing the instantaneous flow rate of the flushing water discharged from the jet water outlet in the small flushing of the flushing toilet according to the first embodiment of the present invention and the instantaneous flow rate of the flushing water flowing into the inlet of the drain trap pipe. [Figure 9] It is a side cross-sectional view showing the flushing toilet according to the second embodiment of the present invention. [Figure 10] It is a partial enlarged view of the jet water outlet part of the flushing toilet according to the second embodiment of the present invention shown in FIG. 9. [Figure 11] It is a plan cross-sectional view seen along the line XI-XI of FIG. 9. [Figure 12] It is a diagram comparing the accumulated amount of kinetic energy from the start of flushing to the activation of the siphon action of the flushing toilet according to the second embodiment of the present invention with that of the conventional product.

Embodiments for Carrying Out the Invention

[0017] The following describes a flush toilet 1 according to the first embodiment of the present invention. First, the basic structure of the flush toilet 1 according to the first embodiment will be explained with reference to Figures 1 and 2. Figure 1 is a plan view showing a flush toilet according to a first embodiment of the present invention, and Figure 2 is a side cross-sectional view taken along the line II-II in Figure 1.

[0018] As shown in Figures 1 and 2, the siphon jet type flush toilet 1 according to the first embodiment comprises a ceramic toilet bowl body 2, a resin toilet seat and toilet lid (not shown) positioned on the upper surface of the toilet bowl body 2, and a water storage tank 4 positioned at the rear upper part of the toilet bowl body 2 and covered by a resin cover (not shown).

[0019] The toilet bowl body 2 includes a bowl section 6 for receiving waste, a drain trap pipe 8 provided at the bottom of the bowl section 6 for discharging waste by siphon action, a rim spout 10 for discharging water from the rim, a rim water channel 12 for supplying flushing water to the rim spout 10, a jet spout 14 for discharging water in a jet stream, and a jet water channel 16 for supplying flushing water to the jet spout 14.

[0020] The bowl portion 6 comprises a bowl-shaped waste receiving surface 18, a rim portion 20 formed along the upper edge of the bowl portion 6, and a shelf portion 21 formed between the waste receiving surface 18 and the rim portion 20. The bowl portion 6 also includes a pot portion 22 formed below the waste receiving surface 18, with a water seal surface W formed inside. Furthermore, the bowl portion 6 includes a buffer portion 50 formed below the pot portion 22 (at the bottom of the bowl portion 6), which connects the jet outlet 14 and the inlet 8a of the drain trap pipe 8. The buffer portion 50 is located below the pot portion 22 and between the jet outlet 14 and the inlet 8a of the drain trap pipe 8.

[0021] The drain trap pipe 8 comprises an inlet 8a, an upward pipe 8b extending upward from the inlet 8a, a downward pipe 8c extending downward from the upward pipe 8b, and a top 8d located between the downward pipe 8c and the upward pipe 8b, which defines the water seal level. 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).

[0022] The rim spout 10 is formed on the left rear side of the rim portion 20 when the toilet bowl body 2 is viewed from the front. The rim spout 10 discharges flushing water forward, and this flushing water flows down to the waste receiving surface 18 while swirling on the inner circumferential surface of the rim portion 20 and the shelf surface of the shelf portion 21.

[0023] The rim water channel 12 is formed in a tapered shape, with the cross-sectional area of ​​the channel gradually decreasing towards the rim outlet 10. A water supply hose 13, which is directly connected to the water supply, is connected to the upstream side of the rim water channel 12. Cleaning water is supplied to the rim water channel 12 from the water supply, and the cleaning water is discharged from the rim outlet 10 due to the water supply pressure from the water supply.

[0024] The jet outlet 14 is formed at the bottom of the bowl section 6. The jet outlet 14 is positioned 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 outlet 14 discharges cleaning water toward the inlet 8a of the drain trap pipe 8, and this cleaning water flows into the drain trap pipe 8 to activate the siphon effect.

[0025] The jet water conduit 16 comprises an upstream channel 16a extending forward from the water storage tank 4, a bent channel 16b branching off from the upstream channel 16a, and a downstream channel 16c extending backward from the bent channel 16b and connecting to the jet discharge port 14. Cleaning water is supplied to the jet water conduit 16 from the water storage tank 4, and the cleaning water is discharged from the jet discharge port 14 due to the head pressure of this cleaning water.

[0026] The water storage tank 4 is a gravity-fed tank that stores the flushing water used for jet discharge and supplies it to the jet outlet 14. The water storage tank 4 is a small resin tank with a volume of approximately 3 liters. Approximately 2 liters of flushing water are discharged from the water storage tank 4 during one flush. The lower part of the water storage tank 4 is positioned below the upper surface of the rim portion 20 of the toilet bowl body 2, and above the top 8d of the drain trap pipe 8. As a result, the flush toilet 1 is a low-profile type toilet. The water source for supplying cleaning water to the jet outlet 14 is not limited to the gravity-fed water storage tank shown in this embodiment; a water storage tank equipped with a pump such as a pressure pump, jet pump, or accumulator pump may also be used.

[0027] Inside the water storage tank 4, there is a water supply device 24 that supplies cleaning water to the water storage tank 4, a drainage device 26 that supplies or stops the cleaning water stored in the water storage tank 4 to the jet water conduit 16, and a float switch 28 that detects when the water level of the cleaning water in the water storage tank 4 reaches the shut-off level (full water level). Outside the water storage tank 4, there is a controller (not shown) that controls the operation of the water supply device 24 and the drainage device 26 to be driven or stopped based on the user's operation signals, and an operation unit (not shown) that transmits operation signals in response to the user's operation.

[0028] The water supply device 24 includes a constant flow valve (not shown) connected to the water supply, a rim-side solenoid valve 23 that supplies or stops the flow of cleaning water to the rim outlet 10, and a tank-side solenoid valve 27 that supplies or stops the flow of cleaning water to the tank inlet 25 located inside the water storage tank 4. The rim-side solenoid valve 23 and the tank-side solenoid valve 27 are driven by a controller command based on user operation signals or water level detection signals from the float switch 28.

[0029] The drainage device 26 includes an overflow pipe 30 for draining overflow water from the water storage tank 4 into the toilet bowl body 2, a drain valve 32 fixed to the lower end of the overflow pipe 30, and a toilet flushing unit 36 ​​that opens and closes the drain valve 32 by moving the overflow pipe 30 up and down using an electric drive. In addition, a guide member 34 is attached around the drain port 4a of the water storage tank 4 to guide the up and down movement of the drain valve 32. The toilet flushing unit 36 ​​is driven by a controller command based on the user's operation signal. The drainage device is not limited to the drain valve shown in this embodiment; a pressure pump, jet pump, accumulator pump, etc., may be used instead of the drain valve.

[0030] The controller is electrically connected to the control unit, float switch 28, rim-side solenoid valve 23, tank-side solenoid valve 27, and toilet flushing unit 36, and is capable of sending and receiving various signals. The controller receives a flush start signal for a full or partial flush from the control unit and drives or stops the rim-side solenoid valve 23, tank-side solenoid valve 27, and toilet flushing unit 36 ​​based on a pre-stored flushing sequence. The amount of water used for flushing is approximately 4.8 liters for a full flush and approximately 3.8 liters for a partial flush.

[0031] Next, the jet water conduit 16 of the flush toilet according to the first embodiment will be described in detail with reference to Figures 1 to 4. Figure 3 is a perspective view showing the entire jet water conduit according to the first embodiment, and Figure 4 is a magnified view of the jet outlet portion of the flush toilet according to the first embodiment shown in Figure 2.

[0032] First, as shown in Figure 1, the jet water channel 16 is formed in a U-shape overall. One end of the jet water channel 16 is connected to the drain port 4a of the water storage tank 4, which is located on the right side when viewing the toilet bowl body 2 from the front, and the other end is connected to the jet outlet 14, which is located in the center in the left-right direction. The upstream channel 16a of the jet water channel 16 extends forward from the drain port 4a of the water storage tank 4, almost parallel to the drain trap pipe 8. The bent channel 16b of the jet water channel 16 bends (turns U-turn) towards the rear from the downstream end of the upstream channel 16a. Furthermore, the downstream channel 16c of the jet water channel 16 extends backward from the downstream end of the bent channel 16b towards the inlet 8a of the drain trap pipe 8.

[0033] Next, as shown in Figure 2, the jet water channel 16 is positioned below the top 8d of the drain trap pipe 8, i.e., below the water seal surface W, except for a portion of area A of the upstream channel 16a located directly below the water storage tank 4 (the area near the drain outlet 4a of the water storage tank 4). Furthermore, as shown in Figure 3, the jet water channel 16 has a larger vertical and horizontal cross-section compared to conventional products, thereby increasing the overall volume of the jet water channel. Specifically, the jet water channel 16 has a volume (approximately 1 liter) that is more than 1 / 3 of the volume of the water storage tank 4 (approximately 3 liters). In addition, the jet water channel 16 has a volume (approximately 1 liter) that is more than half of the amount of cleaning water (approximately 2 liters) discharged from the water storage tank 4 in one cleaning cycle. As a result, more cleaning water remains in the jet water channel 16 compared to conventional products, and the head pressure of the retained cleaning water enables jet discharge. It should be noted that the present invention is not limited to toilets in which all of the jet water channels 16 are located below the top 8d of the drain trap pipe 8, but also includes toilets in which a portion of the jet water channels 16 is located above the top 8d, as in this embodiment.

[0034] Furthermore, as shown in Figure 4, the bottom surface 16d on the downstream side of the upstream channel 16a is located below the upper end 8e of the inlet 8a of the drain trap pipe 8. Moreover, this bottom surface 16d is located in front of the top 8d of the drain trap pipe 8, below the upper end 8e of the inlet 8a of the drain trap pipe 8 (see Figure 2). As a result, even when the water seal level drops and the siphon action is about to end, the washing water continues to accumulate on the downstream side of the upstream channel 16a, thus allowing the siphon action to continue.

[0035] Next, the center O1 of the jet outlet 14 is positioned at approximately the same height as the center O2 of the inlet 8a of the drain trap pipe 8. This makes it easier for the cleaning water discharged from the jet outlet 14 to flow into the inlet 8a of the drain trap pipe 8. Furthermore, the center O1 of the jet outlet 14 is located at the lowest point of the central axis X of the flow path cross-section of the jet water conduit 16 (see Figure 2). As a result, because the center O1 of the jet outlet 14 is located at the lowest point, cleaning water can be discharged from the jet outlet 14 for a long period of time, thereby delaying the entry of air into the jet water conduit 16 from the jet outlet 14.

[0036] Furthermore, the upper end 14a of the jet outlet 14 is positioned below the upper end 8e of the inlet 8a of the drain trap pipe 8. This allows cleaning water to be discharged from the jet outlet 14 for a long period of time, thus maintaining the siphon effect. As shown in Figure 2, more than half of the jet conduit 16 is located above the upper end 8e of the inlet 8a of the drain trap pipe 8. This allows almost all of the cleaning water in the jet conduit to be discharged before the siphon effect ends. In addition, the upper surfaces 16g, 16h, 16i and the bottom surface 16d of the jet conduit 16 are gradually sloped downward from the upstream side to the downstream side. This makes it easier for the cleaning water to flow towards the jet outlet 14.

[0037] Next, the downstream portion of the jet water channel 16 of the flush toilet according to the first embodiment will be described in detail with reference to Figures 1, 4 to 6G. Figure 5 is a plan cross-sectional view along the VV line in Figure 2, and Figures 6A to 6G show cross-sectional views A to G of the water flow channel of the jet water conduit of the flush toilet according to the first embodiment of the present invention shown in Figure 5.

[0038] First, as shown in Figure 5, the downstream channel 16c and the bent channel 16b of the jet water conduit 16 have a curved section 40 formed in a top view, which is eccentric to the opposite side of the upstream channel 16a from the center O1 of the jet outlet 14. The eccentricity distance D between the center O1 of the jet outlet 14 and the center O3 of the channel cross-section at the downstream end of the bent channel 16b is set to approximately 9 mm. Furthermore, the center O1 of the jet outlet 14 is set to be coaxial with the center O4 of the channel cross-section of the buffer section 50 and the center O2 of the inlet 8a of the drain trap pipe 8. This curved section 40 adjusts the flow velocity distribution of the cleaning water discharged from the jet outlet 14, so that the cleaning water discharged from the jet outlet 14 flows toward the inlet 8a of the drain trap pipe 8.

[0039] Next, as shown in Figure 1, the curved section 40 is positioned in the inner region (within the water-sealing region) of the water-sealing surface W when viewed from above, and the entire bent channel 16b is also positioned in the inner region of the water-sealing surface W. As a result, the curved section 40 and the bent channel 16b of the jet water conduit 16 are compactly formed. Furthermore, since the curved section 40 and the bent channel 16b are positioned in the inner region of the water-sealing surface W, the curved section 40 and the bent channel 16b can always be kept full of water, thereby suppressing the accumulation of air within the curved section 40 and the bent channel 16b.

[0040] Furthermore, as shown in Figure 5, a flow straightening section 42 is formed in the downstream flow path 16c on the downstream side of the curved section 40, extending backward toward the jet outlet 14. The flow straightening section 42 extends almost in a straight line for a length of approximately 25 mm toward the jet outlet 14. This allows the cleaning water to be straightened after flowing through the curved section 40.

[0041] Next, the inner surface of the bent channel 16b is formed such that the radius of curvature on the upstream side is r1 and the radius of curvature on the downstream side is r2, with the downstream radius of curvature r2 being smaller than the upstream radius of curvature r1. Furthermore, the outer surface of the bent channel 16b is formed such that the radius of curvature on the upstream side is R1 and the radius of curvature on the downstream side is R2, with the downstream radius of curvature R2 being larger than the upstream radius of curvature R1.

[0042] Here, the cleaning water F1 flowing along the inner surface of the bent channel 16b is affected by centrifugal force and separates from the inner surface, and stagnation S is always generated near the inner surface on the downstream side of the bent channel 16b (see Figure 5). For this reason, even if the radius of curvature of the inner surface on the downstream side of the bent channel 16b is reduced, the effect of energy loss is small. Therefore, since the inner surface on the downstream side of the bent channel 16b, where stagnation S occurs, has a relatively small radius of curvature r2, it is possible to make the bent channel 16b compact while suppressing energy loss in the cleaning water flowing through the bent channel 16b.

[0043] Furthermore, the cleaning water F2 flowing along the outer surface of the bent channel 16b is affected by centrifugal force, resulting in a relatively larger flow rate compared to the cleaning water F1. Since the outer surface of the downstream side of the bent channel 16b, through which a relatively large amount of cleaning water F2 flows, has a relatively large radius of curvature R2, the cleaning water flows along the outer surface while maintaining its flow velocity, thereby suppressing the occurrence of flow separation on the outer surface of the bent channel 16b.

[0044] Furthermore, the jet conduit 16 is formed by a pour molding (double molding) method, which creates a solid molded body between the upstream channel 16a and the flow straightening section 42 of the downstream channel 16c. This makes the space between the upstream channel 16a and the flow straightening section 42 of the downstream channel 16c thinner, allowing the jet conduit 16 to be made more compact.

[0045] As shown in Figures 2 and 6A to 6G, the bottom surface 16d of the upstream channel 16a of the jet conduit 16 is formed to slope downward from the upstream side to the downstream side, while the bottom surface 16e of the bent channel 16b and the bottom surface 16f of the downstream channel 16c are formed to be at approximately the same height and are almost horizontal.

[0046] As shown in Figure 2, the upper surface 16g of the upstream channel 16a, the upper surface 16h of the bent channel 16b, and the upper surface 16i of the downstream channel 16c of the jet water conduit 16 are formed to be inclined downward from the upstream side to the downstream side.

[0047] As shown in Figures 6B to 6D, the height of the upper surface 16h of the bent channel 16b is higher on the outer surface side than on the inner surface side. This allows the cross-sectional area of ​​the bent channel 16b to be larger on the outer surface side than on the inner surface side, thereby suppressing the separation of the cleaning water F2 flowing on the outer surface of the bent channel 16b from the outer surface of the bent channel 16b. Furthermore, as shown in Figures 6F and 6G, the height of the flow straightening section 42 of the downstream channel 16c is formed so that the inner surface side and the outer surface side are at approximately the same height. This allows for better straightening of the cleaning water flow.

[0048] As shown in Figures 6B to 6G, the cross-sections of the bent channel 16b and the downstream channel 16c gradually increase in width and decrease in height from the upstream side to the downstream side. This allows a flattened, high-flow stream to be discharged from the jet outlet 14.

[0049] Next, the flushing operation of the flush toilet 1 according to the first embodiment of the present invention will be explained with reference to Figure 7. Figure 7 is a diagram illustrating the flushing operation of a flush toilet according to the first embodiment of the present invention.

[0050] Figure 7(a) shows the standby state, where cleaning water has accumulated in the bowl section 6 up to the water seal level, and cleaning water has also accumulated in the jet conduit 16 up to the same height as the water seal surface W. At this time, air is stagnating in a portion of area A of the upstream channel 16a located directly below the water storage tank 4.

[0051] Next, as shown in Figure 7(b), the water supply device is activated (the rim-side solenoid valve opens), and rim water discharge begins, causing the water level in the bowl section 6 to gradually rise. Consequently, the water level in the jet water channel 16 also gradually rises, and the air that had been stagnating in a portion of area A of the upstream flow path 16a is discharged from the overflow pipe 30, causing the jet water channel 16 to become full of water.

[0052] Subsequently, as shown in Figure 7(c), while the rim discharge continues, the drainage device 26 is activated (the drain valve 32 opens) and jet discharge begins. At this time, the wash water remaining in the jet water channel 16 is subjected to the head pressure of the wash water stored in the storage tank 4, and a first flow rate is discharged from the jet outlet 14. The first flow rate is a large flow rate, and the jet discharge of the first flow rate fills the drain trap pipe 8, activating the siphon action. The jet discharge of the first flow rate continues for a predetermined time, and the sewage is discharged by the powerful siphon action.

[0053] Next, as shown in Figure 7(d), the drainage device 26 stops (the drain valve 32 closes) while the rim discharge continues. Even though the drainage device 26 stops, because the overall volume of the jet conduit 16 is large, a large amount of cleaning water remains in the jet conduit 16, and a second flow rate is discharged from the jet outlet 14 as the water flows through the jet conduit 16 under the head pressure of the stored cleaning water. The second flow rate is smaller than the first flow rate, but it is sufficient to continue the siphon effect. The jet discharge of the second flow rate continues for a predetermined time, and the siphon effect continues.

[0054] Subsequently, as shown in Figure 7(e), the siphon action causes the seal water to be discharged along with the waste, lowering the water level of the cleaning water in the bowl section 6. Air then enters from the upper end of the inlet 8a of the drain trap pipe 8, ending the siphon action. Here, the jet water channel 16 is formed so that the cleaning water continues to stagnate, delaying the entry of air and thus delaying the end of the siphon action. Rim discharge continues, and cleaning ends when the cleaning water in the bowl section 6 reaches the seal water level. At this time, the cleaning water in the jet water channel 16 also reaches the same height as the seal water surface.

[0055] Next, as shown in Figure 7(f), the water supply device is activated (the tank-side solenoid valve opens) and water supply to the tank begins. When the water level of the cleaning water in the storage tank 4 rises and the float switch detects that the water level has reached the shut-off level (full water level), the water supply device stops (the tank-side solenoid valve closes), and then returns to the original standby state as shown in Figure 7(a).

[0056] Next, the details of the jet water discharge pattern of the flush toilet according to the first embodiment of the present invention will be described with reference to Figures 8A and 8B. Figure 8A is a diagram showing the instantaneous flow rate of flushing water discharged from the jet nozzle and the instantaneous flow rate of flushing water flowing into the inlet of the drain trap pipe during a full flush of a flush toilet according to the first embodiment of the present invention. Figure 8B is a diagram showing the instantaneous flow rate of flushing water discharged from the jet nozzle and the instantaneous flow rate of flushing water flowing into the inlet of the drain trap pipe during a small flush of a flush toilet according to the first embodiment of the present invention. The dashed lines in Figures 8A and 8B indicate the instantaneous flow rate of flushing water discharged from the jet nozzle 14, and the solid lines in Figures 8A and 8B indicate the instantaneous flow rate of flushing water flowing into the inlet 8a of the drain trap pipe 8.

[0057] In this embodiment, the amount of cleaning water discharged from the jet nozzle 14 is approximately 2 liters for a full wash and approximately 1.5 liters for a light wash.

[0058] During a major flush, as shown in Figure 8A, when the drainage device 26 is activated, jet discharge begins, and a first flow rate Q1 is discharged from the jet outlet 14. At this time, the instantaneous flow rate of the cleaning water discharged from the jet outlet 14 increases rapidly immediately after the start (increase rate A), and immediately reaches the maximum instantaneous flow rate Q1max. This rapidly activates the siphon effect (time T1). After this, the instantaneous flow rate decreases slightly from the maximum instantaneous flow rate Q1max and becomes almost constant. In addition, the instantaneous flow rate of the cleaning water flowing into the inlet 8a of the drain trap pipe 8 increases rapidly because, in addition to the cleaning water discharged from the jet outlet 14 and the rim outlet 10, the seal water is drawn into the drain trap pipe 8 by the siphon effect. This activates and maintains a powerful siphon effect.

[0059] Next, as shown in Figure 8A, after the drainage device 26 stops (time T2) and the discharge of the first flow rate Q1 ends, the second flow rate Q2 is discharged from the jet outlet 14. At this time, the instantaneous flow rate of the cleaning water discharged from the jet outlet 14 increases more gradually than the increase rate A of the first flow rate Q1 (increase rate B), reaching the maximum instantaneous flow rate Q2max. This suppresses turbulence in the cleaning water discharged from the jet outlet 14. Furthermore, the maximum instantaneous flow rate Q2max of the second flow rate Q2 is set to be smaller than the maximum instantaneous flow rate Q1max of the first flow rate Q1. This allows the siphon action to be maintained with the second flow rate Q2, which is smaller than the first flow rate Q1, thus achieving both improved waste discharge performance and water conservation. In addition, the instantaneous flow rate of the cleaning water flowing into the inlet 8a of the drain trap pipe 8 is maintained at a high instantaneous flow rate because, in addition to the cleaning water discharged from the jet outlet 14 and the rim outlet 10, the seal water is drawn into the drain trap pipe 8 by the siphon action.

[0060] In a small flush, as shown in Figure 8B, when the drainage device 26 is activated, jet discharge begins, and a first flow rate q1 is discharged from the jet outlet 14. At this time, the instantaneous flow rate of the cleaning water discharged from the jet outlet 14 increases rapidly immediately after the start (increase rate a), and immediately reaches the maximum instantaneous flow rate q1max. This rapidly activates the siphon effect (time t1). After this, the instantaneous flow rate decreases slightly from the maximum instantaneous flow rate q1max, and then decreases rapidly when the drainage device 26 stops (time t2). In addition, the instantaneous flow rate of the cleaning water flowing into the inlet 8a of the drain trap pipe 8 increases rapidly because, in addition to the cleaning water discharged from the jet outlet 14 and the rim outlet 10, the seal water is drawn into the drain trap pipe 8 by the siphon effect. This activates and maintains a powerful siphon effect.

[0061] Next, as shown in Figure 8B, after the drainage device 26 stops (time t2) and the discharge of the first flow rate q1 ends, the second flow rate q2 is discharged from the jet outlet 14. At this time, the instantaneous flow rate of the cleaning water discharged from the jet outlet 14 increases more gradually than the increase rate a of the first flow rate q1 (increase rate b), reaching the maximum instantaneous flow rate q2max. This suppresses turbulence in the cleaning water discharged from the jet outlet 14. Furthermore, the maximum instantaneous flow rate q2max of the second flow rate q2 is set to be smaller than the maximum instantaneous flow rate q1max of the first flow rate q1. This allows the siphon action to be maintained with the second flow rate q2, which is smaller than the first flow rate q1, thus achieving both improved waste discharge performance and water conservation. In addition, the instantaneous flow rate of the cleaning water flowing into the inlet 8a of the drain trap pipe 8 is maintained at a high instantaneous flow rate because, in addition to the cleaning water discharged from the jet outlet 14 and the rim outlet 10, the seal water is drawn into the drain trap pipe 8 by the siphon action.

[0062] Comparing the large and small flushes, as shown in Figures 8A and 8B, the amount of water used for the large or small flush is switched by adjusting the jet discharge time based on the first flow rate Q1 of the large flush and the first flow rate q1 of the small flush. This allows for precise switching of the amount of water used for the flush.

[0063] The effects and benefits of the first embodiment described above will be explained below. First, in the flush toilet 1 according to the first embodiment of the present invention, the jet water channel 16 and / or buffer section 50 are configured such that the flushing water discharged from the jet outlet 14 flows toward the center of the inlet 8a of the drain trap pipe 8. Specifically, in a top view, the inner circumferential surface of the bent channel 16b has a smaller radius of curvature r2 on the downstream side than the radius of curvature r1 on the upstream side. Since the inner circumferential surface on the downstream side of the bent channel 16b, which is the part where stagnation occurs, has a relatively small radius of curvature r2, the bent channel 16b can be made compact while suppressing energy loss. Therefore, the jet water channel 16 can be made compact, and sufficient jet water discharge for waste can be performed, thereby improving waste discharge performance.

[0064] Furthermore, in the flush toilet 1 according to the first embodiment of the present invention, when viewed from above, the outer surface of the curved channel 16b has a larger radius of curvature R2 on the downstream side than the radius of curvature R1 on the upstream side. Since the outer surface of the downstream side of the curved channel 16b, through which a relatively large amount of flushing water flows, has a relatively large radius of curvature R2, it is possible to maintain the flow velocity while simultaneously suppressing the occurrence of flow separation on the outer surface of the curved channel 16b.

[0065] In the flush toilet 1 according to the first embodiment of the present invention, the bottom surface 16e of the curved flow channel 16b is formed almost horizontally, the upper surface 16h of the curved flow channel 16b slopes downward from the upstream side to the downstream side, and the height of the upper surface 16h of the curved flow channel 16b is higher on the outer surface side than on the inner surface side. Therefore, the flow channel cross-sectional area of ​​the curved flow channel 16b is made larger on the outer surface side than on the inner surface side, and flow separation can be suppressed on the outer surface side where a relatively large amount of flushing water flows.

[0066] Furthermore, in the flush toilet 1 according to the first embodiment of the present invention, since the bent channel 16b is located within the water seal area, the jet water channel 16 can be made more compact. In addition, the bent channel 16b can always be kept full of water, and the accumulation of air within the bent channel 16b can be suppressed.

[0067] Next, a flush toilet 100 according to a second embodiment of the present invention will be described with reference to Figures 9 to 12. Except for the shape of the downstream side of the jet water conduit and the buffer section, the basic configuration is the same as that of the flush toilet 1 according to the first embodiment of the present invention described above. Hereinafter, only the differences from the flush toilet 1 according to the first embodiment will be described, and similar configurations, operations, and effects will not be explained.

[0068] Figure 9 is a side cross-sectional view showing a flush toilet according to the second embodiment of the present invention, corresponding to Figure 2 of the first embodiment. Figure 10 is a magnified view of the jet outlet portion of the flush toilet according to the second embodiment of the present invention shown in Figure 9, Figure 11 is a plan cross-sectional view along line XI-XI in Figure 9, and Figure 12 is a diagram comparing the integrated kinetic energy from the start of flushing to the activation of the siphon action of the flush toilet according to the second embodiment of the present invention with that of a conventional product. Note that in the flush toilet 100 according to the second embodiment of the present invention shown in Figures 9 to 12, the same reference numerals are used for the same parts as in the flush toilet 1 according to the first embodiment of the present invention described above.

[0069] As shown in Figures 9 and 10, the lower end 114b of the jet outlet 114 is positioned closer to the inlet 8a of the drain trap pipe 8 than the upper end 114a. The distance D1 in the front-rear direction from the lower end 114b of the jet outlet 114 to the inlet 8a of the drain trap pipe 8 is shorter than the distance D2 in the front-rear direction from the upper end 114a of the jet outlet 114 to the inlet 8a of the drain trap pipe 8. Thus, in a side cross-section, the jet outlet 114 is inclined downward toward the inlet 8a of the drain trap pipe 8. As a result, the area in which the buffer portion 150 is formed is reduced, the energy loss received when passing through the buffer portion 150 is reduced, and the cleaning water discharged from the jet outlet 114 flows forcefully into the drain trap pipe 8.

[0070] As shown in Figure 11, the jet water channel 116 comprises an upstream channel 116a extending forward from the water storage tank 4, a bent channel 116b that bends from the upstream channel 116a, and a downstream channel 116c that extends backward from the bent channel 116b and connects to the jet outlet 114. A buffer section 150 is provided between the jet outlet 114 and the inlet 8a of the drain trap pipe 8, and the jet water channel 116 communicates with the drain trap pipe 8 via this buffer section 150.

[0071] As shown in Figure 11, the center O101 of the jet outlet 114 is positioned eccentrically towards the upstream flow path 116a by an eccentric distance D3 with respect to the center O104 of the flow path cross-section of the buffer section 150 and the center O2 of the inlet 8a of the drain trap pipe 8. In a top view, the jet water conduit 116 is set so that the position P of the main stream F3 of the cleaning water passing through the jet outlet 114 is approximately coaxial with the center O104 of the flow path cross-section of the buffer section 150 and the center O2 of the inlet 8a of the drain trap pipe 8. As a result, cleaning water is discharged from the jet outlet 114 toward the center O2 of the inlet 8a of the drain trap pipe 8.

[0072] Next, the upstream end 150a, located at the upstream end of the buffer section 150, is formed such that, in a top view, the radius of curvature on the inner circumferential surface side is r101 and the radius of curvature on the outer circumferential surface side is R101, with the radius of curvature on the inner circumferential surface side r101 being smaller than the radius of curvature on the outer circumferential surface side R101. As a result, the cleaning water discharged from the jet outlet 114 is attracted to the inner circumferential surface side with the relatively smaller radius of curvature r101 and flows toward the center O2 of the inlet 8a of the drain trap pipe 8.

[0073] Furthermore, as shown in Figure 11, the jet water channel 116 and the buffer section 150 are connected via a connecting section 152. In a top view, the connecting section 152 has an inner circumferential radius of curvature of r102 and an outer circumferential radius of curvature of R102, with the inner circumferential radius r102 and the outer circumferential radius R102 being approximately the same size. In addition, the inner circumferential radius r102 and the outer circumferential radius R102 of the connecting section 152 are formed to be smaller than the inner circumferential radius r101 of the upstream end 150a of the buffer section 150 in a top view. This makes it possible to suppress flow separation when water is discharged from the jet outlet 114.

[0074] Next, with reference to Figure 12, the kinetic energy of the flushing water discharged from the jet outlet 114 of the flush toilet 100 according to the second embodiment of the present invention as it flows into the drain trap pipe 8 will be explained. Figure 12 is a diagram comparing the integrated kinetic energy of a flush toilet 100 according to the second embodiment of the present invention from the start of flushing until the siphon action is activated with that of a conventional product. The kinetic energy of the flushing water shown in Figure 12 was measured using fluid analysis, and it shows the integrated kinetic energy at (1) the position of the jet outlet 114, (2) the intermediate position in the front-rear direction of the buffer section 150, and (3) the position of the inlet 8a of the drain trap pipe 8, respectively.

[0075] As shown in Figure 12, in the conventional product, the kinetic energy of each part is greatest at the jet outlet 114, then becomes smaller at the intermediate position of the buffer section 150 than at the jet outlet 114, and at the inlet 8a of the drain trap pipe 8, it is smaller than at both the jet outlet 114 and the intermediate position of the buffer section 150.

[0076] As shown in Figure 12, the kinetic energy of each part of the flush toilet according to the second embodiment of the present invention is lower at the jet outlet 114 than in the conventional product, but higher at the intermediate position of the buffer section 150 and the inlet 8a of the drain trap pipe 8 than in the conventional product. Thus, it can be seen that in the flush toilet 100 according to the second embodiment of the present invention, the energy loss of the flushing water discharged from the jet outlet 114 is suppressed and the water flows into the drain trap pipe 8.

[0077] The effects and benefits of the second embodiment described above will be explained below. First, in the flush toilet 100 according to the second embodiment of the present invention, the jet water conduit 16 and / or buffer section 50 are configured such that the flushing water discharged from the jet outlet 14 flows toward the center of the inlet 8a of the drain trap pipe 8. Specifically, the jet water conduit 116 is configured such that, in a top view, the position of the main stream of flushing water passing through the jet outlet 114 is approximately coaxial with the center O104 of the flow path cross-section of the buffer section 150 and the center O2 of the drain trap pipe 8. Therefore, flushing water can be discharged from the jet outlet 114 toward the center of the inlet 8a of the drain trap pipe 8. Thus, even if the jet water conduit 16 is made compact, sufficient jet discharge for waste can be achieved, and the waste discharge performance can be improved.

[0078] Furthermore, in the flush toilet 100 according to the second embodiment of the present invention, in a top view, the radius of curvature r101 on the inner circumferential surface side of the upstream end 150a of the buffer section 150 is smaller than the radius of curvature R101 on the outer circumferential surface side. Therefore, the flushing water discharged from the jet outlet 114 is attracted to the inner circumferential surface side with the relatively smaller radius of curvature r101 and flows towards the center O2 of the inlet 8a of the drain trap pipe 8.

[0079] In the flush toilet 100 according to the second embodiment of the present invention, the connection portion 152 connecting the jet water channel 116 and the buffer portion 150 has a radius of curvature r102,R102 smaller than the radius of curvature r101 on the inner circumference side of the upstream end 150a of the buffer portion 150, so that flow separation can be suppressed when water is discharged from the jet outlet 114.

[0080] Furthermore, in the flush toilet 100 according to the second embodiment of the present invention, the distance D1 from the lower end 114b of the jet outlet 114 to the inlet 8a of the drain trap pipe 8 is shorter than the distance D2 from the upper end 114a of the jet outlet 114 to the inlet 8a of the drain trap pipe 8. This reduces the area in which the buffer portion 150 is formed, thereby reducing the energy loss received when water is discharged from the jet outlet 114.

[0081] 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]

[0082] 1: Flush toilet 2: Toilet bowl 4: Water storage tank 6: Bowl section 8: Drain trap pipe 8a: Inlet of drain trap pipe 8b: Rising pipe for drain trap piping 8c: Downward pipe for drain traps 8d: Top of the drain trap pipe 8e: Upper end of the inlet of the drain trap pipe. 10: Rim spout 14: Jet nozzle 14a: Upper end of the jet nozzle 16: Jet water conduit 16a: Upstream channel of the jet conduit 16b: Bent channel of a jet conduit 16c: Downstream channel of the jet conduit 16d: Bottom surface of the upstream channel of the jet conduit 16e: Bottom surface of the bent channel of the jet conduit 16f: Bottom surface of the downstream channel of the jet conduit 16g: Upper surface of the upstream channel of the jet conduit. 16h: Upper surface of the bent channel of the jet water conduit 16i: Upper surface of the downstream channel of the jet conduit 18: Waste receiving surface 20: Rim section 26: Drainage device 30: Overflow pipe 32: Drain valve 40: Curved section 42: Rectifier D: Eccentricity distance F1: Cleaning water for the inner circumferential surface F2: Cleaning water for the outer surface O1: Center of the jet nozzle O2: Center of the inlet of the drain trap pipe. O3: Center of the downstream end of the bend in the channel. X: Central axis of the jet conduit Q1, q1: First flow rate Q1max, q1max: Maximum instantaneous flow rate of the first flow rate A,a: Increase rate of the first flow rate Q2, q2: Second flow rate Q2max, q2max: Maximum instantaneous flow rate of the second flow rate. B,b: Second rate of increase in flow rate R1: Radius of curvature on the upstream side of the outer surface R2: Radius of curvature on the downstream side of the outer surface r1: Radius of curvature on the upstream side of the inner surface r2: Radius of curvature on the downstream side of the inner surface W: Water sealing surface 100: Flush toilet 114: Jet spout 114a: Upper end of the jet nozzle 114b: Lower end of the jet nozzle 116: Jet water conduit 116a: Upstream channel of the jet conduit 116b: Bent channel of a jet conduit 116c: Downstream channel of the jet conduit 150: Buffer section 150a: Upstream end of buffer section 152: Connection part D1: Distance from the lower end of the jet outlet to the inlet of the drain trap pipe. D2: Distance from the top of the jet outlet to the inlet of the drain trap pipe. O101: Center of the jet nozzle O104: Center of the flow channel cross-section of the buffer section R101: Radius of curvature of the outer surface of the upstream end of the buffer section. r101: Radius of curvature on the inner surface side of the upstream end of the buffer section R102: Radius of curvature on the outer surface of the connection part r102: Radius of curvature on the inner surface side of the connection part

Claims

1. It is a siphon jet type flush toilet, A bowl-shaped waste receiving surface and a rim formed on the upper edge, A rim outlet is provided on the rim portion and discharges cleaning water toward the bowl portion, A drain trap pipe comprising a rising pipe extending upward from the bottom of the bowl section, a descending pipe extending downward from the rising pipe, and a top section located between the descending pipe and the rising pipe that defines the water seal level, A jet outlet provided at the bottom of the bowl section for discharging cleaning water toward the inlet of the drain trap pipe, and a cleaning water source for supplying cleaning water to this jet outlet, A jet water channel connects the above-mentioned cleaning water source and the above-mentioned jet outlet, and supplies cleaning water from the above-mentioned cleaning water source to the above-mentioned jet outlet. A buffer section is provided at the bottom of the bowl section and connects the jet outlet and the inlet of the drain trap pipe, It has, The above-mentioned jet water channel has an upstream channel extending forward from the above-mentioned washing water source, a bent channel that bends from this upstream channel, and a downstream channel that extends backward from this bent channel and connects to the above-mentioned jet discharge port. The jet water channel and / or buffer section described above are configured such that the cleaning water discharged from the jet outlet flows toward the center of the inlet of the drain trap pipe. A flush toilet in which, in a top view, the downstream channel of the jet water channel has a curved section formed on its inner and outer surfaces that are eccentric to the opposite side of the upstream channel from the central axis of the jet outlet.

2. The flush toilet according to claim 1, wherein, in a top view, the inner circumferential surface of the bent channel of the jet water conduit has a smaller radius of curvature on the downstream side than on the upstream side.

3. The flush toilet according to claim 2, wherein, in a top view, the outer surface of the curved channel of the jet water conduit has a larger radius of curvature on the downstream side than on the upstream side.

4. The bottom surface of the curved channel of the above-mentioned jet water conduit is formed almost horizontally. The flush toilet according to claim 3, wherein the upper surface of the curved channel is inclined downward from the upstream side to the downstream side, and the height of the upper surface of the curved channel is higher on the outer surface side than on the inner surface side.

5. The flush toilet according to claim 1, wherein the jet water channel is configured such that, in a top view, the position of the main stream of flushing water passing through the jet outlet is substantially coaxial with the center of the buffer section and the center of the drain trap pipe.

6. The buffer portion is formed at the bottom of the bowl portion, located between the jet outlet and the inlet of the drain trap pipe, and in a top view, the width of the flow path widens downstream from the jet outlet, and then forms a flow path that extends toward the inlet of the drain trap pipe, and the center of the flow path cross-section of the buffer portion is configured to be coaxial with the center of the inlet of the drain trap pipe, The flush toilet according to claim 1, wherein the upstream end of the buffer portion is curved in an arc shape so as to protrude outward from the flow path of the buffer portion when viewed from above, and the radius of curvature on the inner circumferential surface side of the upstream end is smaller than the radius of curvature on the outer circumferential surface side.

7. A connecting portion is provided between the jet outlet and the buffer portion, connecting the jet water channel and the buffer portion. The flush toilet according to claim 6, wherein the above-mentioned connection portion is curved in an arc shape so as to protrude inward toward the flow path of the connection portion when viewed from above, and the radius of curvature of the connection portion is smaller than the radius of curvature of the inner circumference of the upstream end of the buffer portion.

8. The flush toilet according to claim 6 or 7, wherein the distance from the lower end of the jet nozzle to the inlet of the drain trap pipe is shorter than the distance from the upper end of the jet nozzle to the inlet of the drain trap pipe.

9. The flush toilet according to claim 1, wherein the curved channel is located within the water seal area when viewed from above.

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