Water closet

Abstract

To provide a water closet capable of suppressing the discharge of air with washing water from a jet water discharge port, powerfully discharging the washing water from the jet water discharge port, and thereby sufficiently discharging dirt.SOLUTION: A siphon jet type water closet includes a bowl part 6, a drain trap conduit 8, a jet discharge port 14, a jet water conduit 16 and a washing water tank 4. The jet water conduit 16 includes: a main water conduit 26 extending forward from the washing water tank 4; a first curved channel 28 or a second curved channel 30 extending forward while bending from the main water conduit 26; and an exit channel 32 extending rearward from the first curved channel 28 or the second curved channel 30 to connect to the jet discharge port 14. The first curved channel 28 or the second curved channel 30 is provided below a peak part 8d of the drain trap conduit 8 and is so constituted that the channel is completely filled in a waiting state before the start of washing of a toilet bowl.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Siphon jet flush toilets that use a jet of water to generate a siphon effect and discharge waste are known, as described in Patent Documents 1 and 2. Such flush toilets are equipped with a jet water outlet located at the bottom of the bowl, and a jet water conduit that directs flush water from a flush water tank to the jet water outlet. When toilet flushing begins and flush water from the flush water tank is supplied to the jet water conduit, flush water is discharged from the jet water outlet toward the inlet of the drain trap pipe. This fills the drain trap with water, causing the siphon effect to occur. Furthermore, in the flush toilets described in Patent Documents 1 and 2, the jet water conduit comprises a main water conduit that extends forward in a straight line from the drain outlet of the flush water tank, a curved flow path that bends from this main water conduit and extends forward, and an outlet flow path that extends rearward from this curved flow path and connects to the jet spout. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-274679 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-168994 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the flush toilets described in Patent Documents 1 and 2 mentioned above, the curved flow path of the jet water conduit is positioned above the seal water level, so air is present in the curved flow path when the toilet is in a standby state before flushing begins. The air present in the curved flow path has nowhere to escape when flush water is supplied to the curved flow path, so it is discharged from the jet water outlet together with the flush water. When air is discharged from the jet water outlet together with the flush water, the force of the flush water discharged from the jet water outlet weakens, which poses the problem of the possibility that waste may not be sufficiently discharged.

[0005] Therefore, the present invention aims to provide a flush toilet that suppresses air from being discharged from the jet spout together with the flush water, and that allows the flush water to be forcefully discharged from the jet spout, thereby enabling waste to be sufficiently discharged. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a siphon jet flush toilet, comprising a bowl portion having a bowl-shaped waste receiving surface, a rim portion formed above the waste receiving surface, and a basin portion formed below the waste receiving surface within which a water seal is formed, an ascending pipe provided below the bowl portion and extending upward, a descending pipe extending downward from the ascending pipe, and a drain trap pipe having a top portion located between the descending pipe and the ascending pipe and determining the water seal level, a rim spout provided in the rim portion that spouts flush water toward the bowl portion, and a rim spout provided below the bowl portion and directed toward the inlet of the drain trap pipe. a jet water outlet that discharges flush water, a rim water conduit that directs flush water to the rim water outlet, a jet water conduit that directs flush water to the jet water outlet, and a water supply source that is provided above the top of the drain trap pipe and supplies flush water to the jet water conduit, the jet water conduit having a main water conduit that extends forward from the water supply source, a bent flow path that bends from this main water conduit and extends forward, and an outlet flow path that extends rearward from this bent flow path and connects to the jet water outlet, the bent flow path being positioned below the top of the drain trap pipe and configured to be filled with water when in standby mode before the toilet flush begins.

[0007] According to the present invention configured in this way, the curved flow path is positioned below the top of the drain trap pipe and is configured to be full of water in the standby state before the toilet flushing starts, so that no air is present in the curved flow path in the standby state before the toilet flushing starts, and therefore air can be prevented from being discharged from the jet water outlet together with the flush water. This allows the flush water to be forcefully discharged from the jet water outlet, thereby allowing waste to be sufficiently discharged.

[0008] In the present invention, the bent flow path of the jet water conduit is preferably arranged in a region where a water seal is formed in a plan view.

[0009] According to the present invention configured in this manner, the curved flow path of the jet water conduit is positioned within the area where the water seal is formed when viewed in a plane, so that the curved flow path can be reliably filled with water when in the standby state before the toilet flushing begins.

[0010] In the present invention, the angle at which the top surface of the main channel slopes downward relative to the horizontal is preferably set to be greater than the angle at which the bottom surface of the main channel slopes downward relative to the horizontal.

[0011] According to the present invention configured in this way, the angle at which the top surface of the main conduit slopes downward relative to the horizontal is set to be greater than the angle at which the bottom surface of the main conduit slopes downward relative to the horizontal, so a space in which air can be retained can be formed within the main conduit. This allows air to be retained within the main conduit and prevents the air from being discharged from the jet spout together with the wash water.

[0012] In the present invention, the toilet is preferably configured so that the seal water level drops during toilet flushing and air flows in from the jet water outlet.

[0013] According to the present invention configured in this manner, the seal water level drops during toilet flushing and air flows in from the jet water outlet, so the air in the curved flow path can be replaced with air.

[0014] In the present invention, the upper surface of the curved flow path of the jet waterway is inclined downward from the upstream side to the downstream side.

[0015] According to the present invention configured in this way, the upper surface of the curved flow path of the jet water conduit is inclined downward from the upstream side to the downstream side, so that flush water flowing through the jet water conduit can be smoothly guided downstream. Also, air that flows in from the jet water spout can be smoothly guided upstream, preventing air from remaining in the curved flow path when in standby mode before the toilet flush begins.

[0016] In the present invention, the cross section of the curved channel of the jet water channel is preferably set so that the height dimension of the outer side surface is greater than the height dimension of the inner side surface in the vicinity of the main water channel.

[0017] According to the present invention configured in this manner, the flow path cross section of the curved flow path of the jet water conduit is set so that the height dimension of the outer side is larger than the height dimension of the inner side near the main water path, so that the flow path cross section area can be increased while avoiding interference with the drain trap pipe adjacent to the curved flow path, thereby suppressing pressure loss in the cleaning water flowing through the curved flow path.

[0018] In addition, in the present invention, the curved flow path has a first curved flow path that branches off from the main water path, bends to the left and extends forward, and a second curved flow path that branches off from the main water path, bends to the right and extends forward, and the first curved flow path and the second curved flow path join at their downstream ends and are connected to the outlet flow path.

[0019] According to the present invention configured in this manner, the curved flow path has a first curved flow path that branches off from the main water path, bends to the left and extends forward, and a second curved flow path that branches off from the main water path, bends to the right and extends forward, and the first curved flow path and the second curved flow path merge at their downstream ends and are connected to the outlet flow path, so that the wash water can be forcefully sprayed out from the jet water outlet.

[0020] In the present invention, the jet conduit and the rim conduit are formed separately.

[0021] According to the present invention configured in this manner, the jet water conduit and the rim water conduit are formed separately, so that the head pressure of the flush water stored in the flush water tank can be applied relatively early, causing the flush water to be forcefully discharged from the jet water outlet. [Effects of the Invention]

[0022] According to the flush toilet of the present invention, the present invention prevents air from being discharged from the jet spout together with the flush water, and allows the flush water to be forcefully discharged from the jet spout, thereby allowing waste to be sufficiently discharged. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a plan view of a flush toilet according to an embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 2 is a perspective view of a jet waterway of a flush toilet according to an embodiment of the present invention. [Figure 4] FIG. 2 is a left side view of a jet water channel of a flush toilet according to an embodiment of the present invention. [Figure 5] FIG. 2 is a plan view of a jet waterway of a flush toilet according to an embodiment of the present invention. [Figure 6A] FIG. 6 is a cross-sectional view taken along line VIA-VIA in FIG. 5. [Figure 6B] FIG. 6 is a cross-sectional view taken along line VIB-VIB in FIG. 5. [Figure 6C] FIG. 6 is a cross-sectional view taken along line VIC-VIC in FIG. 5. [Figure 6D] FIG. 6 is a cross-sectional view taken along the line VID-VID in FIG. 5. [Figure 6E] FIG. 6 is a cross-sectional view taken along the line VIE-VIE in FIG. 5. [Figure 6F] FIG. 6 is a cross-sectional view taken along the line VIF-VIF in FIG. 5. [Figure 6G] FIG. 6 is a cross-sectional view taken along the line VIG-VIG in FIG. 5. [Figure 6H] FIG. 6 is a cross-sectional view taken along the line VIH-VIH in FIG. 5. [Figure 6I] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 5. [Figure 7A] FIG. 2 is a schematic diagram showing the flow of flush water at the beginning of a flush in a flush toilet according to an embodiment of the present invention. [Figure 7B] FIG. 10 is a schematic diagram showing the flow of flush water in the middle of a flush in a flush toilet according to an embodiment of the present invention. [Figure 7C] FIG. 2 is a schematic diagram showing the flow of flush water at the end of a flush in a flush toilet according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0024] A flush toilet according to an embodiment of the present invention will now be described with reference to the drawings. First, the basic structure of a flush toilet 1 according to an embodiment of the present invention will be explained with reference to FIGS. Fig. 1 is a plan view of a flush toilet according to an embodiment of the present invention, and Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. In Fig. 1 and Fig. 2, dashed lines indicate the rim water conduit 12 and the jet water conduit 16, respectively. In this specification, when viewing a flush toilet from the front, the near side will be referred to as the front side, the far side as the rear side, the right side as the right side, and the left side as the left side; when viewing a flush toilet from above, the center side of the toilet will be referred to as the inside, and the outer casing side of the toilet will be referred to as the outside.

[0025] As shown in Figures 1 and 2, a flush toilet 1 according to an embodiment of the present invention is a siphon jet flush toilet that uses a jet of water to generate a siphon action to expel waste.

[0026] As shown in Figure 1, a flush toilet 1 comprises a toilet body 2 and a flush water tank 4 located at the upper rear of the toilet body 2. The toilet body 2 and flush water tank 4 are integrally formed from ceramic. A lever handle (not shown) is provided on the flush water tank 4, and the user operates the lever handle to flush the toilet.

[0027] The toilet body 2 is equipped with a bowl portion 6 that receives waste, a drain trap pipe 8 that is located at the bottom of the bowl portion 6 and that discharges waste by siphon action, a rim spout 10 that spouts water from the rim, a rim water conduit 12 that supplies flush water to the rim spout 10, a jet spout 14 that spouts water in a jet, and a jet water conduit 16 that supplies flush water to the jet spout 14. Note that in the flush toilet 1 according to the embodiment of the present invention, the rim water conduit 12 and the jet water conduit 16 are provided separately, but this is not the only embodiment, and the rim water conduit 12 and jet water conduit 16 may also be configured as a single water conduit.

[0028] Bowl portion 6 has a bowl-shaped waste receiving surface 18, a rim portion 20 that is formed along the upper edge of bowl portion 6 and forms an inner circumferential surface 20a that overhangs inward, and a shelf surface 22 formed between waste receiving surface 18 and rim portion 20. Bowl portion 6 also has a pot portion 24 that is formed in the area below waste receiving surface 18 and connected to drain trap pipe 8. A water seal W is formed inside pot portion 24.

[0029] The drain trap pipe 8 has an inlet 8a, an ascending pipe 8b extending upward from the inlet 8a, a descending pipe 8c extending downward from the ascending pipe 8b, and a top 8d located between the descending pipe 8c and the ascending pipe 8b and defining the seal water level WL0. 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).

[0030] The rim spout 10 is formed in the rim portion 20, and is positioned on the rear side of the bowl portion 6 and near the center in the left-right direction. Flush water is spouted from the rim spout 10 along the inner circumferential surface 20a of the rim portion 20, and swirls counterclockwise on the ledge surface 22 along the inner circumferential surface 20a of the rim portion 20. As the flush water swirls on the ledge surface 22 in this way, the flush water flows down from the ledge surface 22 onto the waste receiving surface 18, cleaning the waste receiving surface 18. Note that while the flush toilet 1 according to the embodiment of the present invention has been described as having only one rim spout 10, the present invention is not limited to this configuration and other configurations are also possible, for example, a configuration in which two or more rim spouts are provided.

[0031] One end of the rim conduit 12 is connected to the rim drain outlet 4b formed in the bottom surface 4a of the flush water tank 4, and the other end is connected to the rim spout 10. In a plan view, the rim conduit 12 is formed so that it extends forward from the rim drain outlet 4b of the flush water tank 4, bends gently to the right, and then bends at an almost right angle to the left (see Figure 1). Flush water is supplied to the rim conduit 12 from the flush water tank 4, and the head pressure of this flush water causes flush water to be spouted from the rim spout 10.

[0032] Jet water spout 14 is formed in the bottom of bowl portion 6. Jet water spout 14 is positioned opposite inlet 8a of drain trap pipe 8 and is directed toward inlet 8a of drain trap pipe 8. Flush water is spouted from jet water spout 14 toward inlet 8a of drain trap pipe 8, causing a siphon effect to occur in a relatively short time.

[0033] One end of the jet water conduit 16 is connected to a jet drain outlet 4c formed in the bottom surface 4a of the flush water tank 4, and the other end is connected to the jet spout 14. The jet water conduit 16 is equipped with a main water conduit 26 that extends forward from the jet drain outlet 4c of the flush water tank 4, a first bent flow path 28 that branches off from the downstream end of the main water conduit 26 and bends to the left before extending forward, a second bent flow path 30 that branches off from the downstream end of the main water conduit 26 and bends to the right before extending forward, and an outlet flow path 32 where the downstream ends of the first bent flow path 28 and the second bent flow path 30 join and extend rearward before connecting with the jet spout 14 (see Figure 1). Flush water is supplied to the jet water conduit 16 from the flush water tank 4, and the head pressure of this flush water causes flush water to be spouted from the jet spout 14.

[0034] The flush water tank 4 is a gravity-fed tank that stores flush water supplied from a water supply source (not shown), such as a tap, and supplies this stored flush water to the toilet body using gravity. A rim drain outlet 4b, which drains water into the rim water conduit 12, and a jet drain outlet 4c, which drains water into the jet water conduit 16, are formed in the bottom surface 4a of the flush water tank 4. The bottom surface 4a of the flush water tank 4 is positioned above the top 8d of the drain trap pipe 8, and is positioned at approximately the same height as the upper surface of the rim section 20 (see Figure 2). Furthermore, the rim drain outlet 4b is positioned in front of the jet drain outlet 4c (see Figure 1). A rim drain valve and a jet drain valve (not shown) are provided inside the flush water tank 4 to open and close the rim drain outlet 4b and jet drain outlet 4c, respectively. Furthermore, in the flush toilet 1 according to the embodiment of the present invention, an embodiment has been explained in which the flush water tank is a gravity-fed tank, but this is not limited to this embodiment, and other embodiments are possible, for example, the flush water tank may be a pressurized or accumulator tank. Also, in the flush toilet 1 according to the embodiment of the present invention, the rim drain outlet 4b and the jet drain outlet 4c are provided separately, but this is not limited to this embodiment, and there may also be an embodiment in which the rim drain outlet 4b and the jet drain outlet 4c are configured as a single drain outlet.

[0035] The flush water tank 4 is equipped with a water pressure drive mechanism (not shown) that is driven by the water supply pressure of flush water supplied from a water supply source, for example, and the water pressure drive mechanism is driven by the user operating a lever handle, causing the rim drain valve and jet drain valve to operate at different times. This causes the rim drain outlet 4b and the jet drain outlet 4c to open and close at different times, causing flush water to be discharged from the rim water spout 10 and the jet water spout 14 at different times. Specifically, after the toilet flush begins, flush water is first discharged from the rim water spout 10, then, while water is continuing to be discharged from the rim water spout 10, flush water is discharged from the jet water spout 14, and after water discharging from the jet water spout 14 stops, flush water from the rim water spout 10 returns the water seal W to its initial state.

[0036] Next, the jet water conduit 16 of a flush toilet 1 according to an embodiment of the present invention will be described in detail with reference to Figures 3 to 5. Figure 3 is a perspective view of the jet water conduit of a flush toilet according to an embodiment of the present invention, Figure 4 is a left side view of the jet water conduit of a flush toilet according to an embodiment of the present invention, and Figure 5 is a plan view of the jet water conduit of a flush toilet according to an embodiment of the present invention. Note that the left-right central axis CL of the jet water conduit 16 in Figure 5 coincides with the left-right central axis of the toilet body 2.

[0037] The jet water conduit 16 is formed by a water conduit separate from the rim water conduit 12, and is a water conduit for guiding flush water supplied from the jet drain outlet 4c of the flush water tank 4 to the jet water spout 14. As shown in Figures 3 to 5, the jet water conduit 16 comprises, from upstream to downstream, an inlet 16a, a main water conduit 26, a first bent flow path 28 and a second bent flow path 30, an outlet flow path 32, and the jet water spout 14.

[0038] First, the inlet 16a of the jet water conduit 16 opens upward, and the jet drain outlet 4c of the flush water tank 4 is connected to this inlet 16a. The inner diameter of the inlet 16a of the jet water conduit 16 is set to be the same size as the inner diameter of the jet drain outlet 4c of the flush water tank 4. The inlet 16a of the jet water conduit 16 is located in the left-right centre of the upper rear part of the toilet body 2, and is located at approximately the same height as the top surface of the toilet body 2. The cross-sectional area of ​​the opening of the inlet 16a of the jet water conduit 16 is set to be larger than the cross-sectional area of ​​the opening of the jet water spout 14.

[0039] Furthermore, the main conduit 26 of the jet conduit 16 extends in a straight line through the left-right centre of the toilet body 2, from the jet drain outlet 4c of the flush water tank 4 to near the rear wall 24a of the basin section 24 of the bowl section 6 (see Figure 1). As shown in Figures 3 and 4, the main conduit 26 is formed so as to slope downward towards the front. Specifically, the top surface 26a of the main conduit 26 extends in a substantially horizontal direction on the upstream side, and is formed so as to slope downward towards the front on the downstream side. The bottom surface 26b of the main conduit 26 is formed so as to slope downward towards the front on the upstream side, and slope downward towards the front on the downstream side at a greater angle than on the upstream side.

[0040] As shown in Figure 4, the angle of inclination α at which the upper surface 26a on the downstream side of the main channel 26 slopes downward with respect to the horizontal is set to be larger than the angle of inclination β at which the bottom surface 26b on the downstream side of the main channel slopes downward with respect to the horizontal. This allows a space S (the area surrounded by a dashed line in Figure 4) in which air stagnates to be formed downstream of the main channel 26. The space S in which air stagnates is formed near the outlet of the main channel 26, and the air in the main channel 26 is pushed by the wash water and collected in the space S.

[0041] The cross section of the main conduit 26 (cross section perpendicular to the flow direction of the flush water) is formed in a flat, generally rectangular shape with its width greater than its height. The width of the cross section of the main conduit 26 is set to be larger than the inner diameter of the inlet 16a (jet outlet 4c) of the jet conduit 16 (see Figure 5). The vertical width of the cross section of the main conduit 26 is set to be approximately the same as the vertical width of the cross sections of the first bent channel 28 and the second bent channel 30 on the upstream side, and is set to be larger than the vertical width of the cross sections of the first bent channel 28 and the second bent channel 30 on the downstream side (see Figure 4).

[0042] The first bent flow path 28 and the second bent flow path 30 branch off from the lower end of the main water passage 26 and bend along the side wall 24b of the basin portion 24 of the bowl portion 6 (see FIG. 1). In a plan view, the first bent flow path 28 and the second bent flow path 30 are formed symmetrically about the central axis CL of the jet water passage 16 in the left-right direction (see FIG. 5). The first bent flow path 28 and the second bent flow path 30 are located below the top 8d of the drain trap pipe 8 (see FIG. 2). In addition, in a plan view, the first bent flow path 28 and the second bent flow path 30 are located within the area where the seal water W is formed within the basin portion 24 (see FIG. 1). As a result, the first bent flow path 28 and the second bent flow path 30 are configured to be filled with water in the standby state before the toilet flush starts.

[0043] As shown in Figures 3 and 4, the top surface 28a of the first curved channel 28 and the top surface 30a of the second curved channel 30 are gradually inclined downward from the upstream side to the downstream side. The bottom surface 28b of the first curved channel 28 and the bottom surface 30b of the second curved channel 30 are gradually inclined downward from the upstream side to the downstream side. The vertical width of the cross-section of the first curved channel 28 and the second curved channel 30 is set to be approximately the same as the vertical width of the cross-section of the upstream side of the main channel 26 (see Figure 4). The horizontal width of the cross-section of the first curved channel 28 and the second curved channel 30 is set to be smaller than the horizontal width of the cross-section of the main channel 26 (see Figure 5). As a result, the first curved channel 28 and the second curved channel 30 are smaller in size than conventional products.

[0044] Furthermore, the outlet flow path 32 of the jet water conduit 16 extends linearly toward the jet water spout 14 along the left-right central axis CL of the jet water conduit 16 after the first bent flow path 28 and the second bent flow path 30 join (see FIG. 5). The flow path cross section of the outlet flow path 32 is formed in a roughly rectangular shape. The upper surface 32a of the outlet flow path 32 is formed so as to slope downward toward the front, and the bottom surface 32b of the outlet flow path 32 is formed so as to extend in a roughly horizontal direction (see FIG. 4). The flow path cross-sectional area of ​​the outlet flow path 32 is set so as to gradually decrease from the upstream side toward the downstream side.

[0045] As shown in Figure 1, the jet water spout 14 is located in the left-right center of the bowl portion 6. The upper end of the jet water spout 14 is located at a position higher than the lowest seal water level WL1 during flushing. The opening cross section of the jet water spout 14 is formed in a roughly rectangular shape. The opening cross section area of ​​the jet water spout 14 is set to be smaller than the flow path cross section area of ​​the outlet flow path 32.

[0046] Next, the first curved flow path 28 of the jet water conduit 16 of a flush toilet 1 according to an embodiment of the present invention will be described in detail with reference to Figures 6A to 6I. Figures 6A to 6I are cross-sectional views taken along lines VIA-VIA and VII-VII in Figure 5, respectively. Below, the first curved flow path 28 will be described, but as for the second curved flow path 30, as mentioned above, it is bilaterally symmetrical to the first curved flow path 28 with respect to the central axis CL, and therefore a description thereof will be omitted.

[0047] As shown in FIGS. 6B to 6E , the upper surface 28a of the first curved flow path 28 slopes upward from the inner periphery toward the outer periphery on the upstream side of the first curved flow path 28. In other words, the upper end of the outer side surface 28c is located higher than the upper end of the inner side surface 28d. Furthermore, the bottom surface 28b of the first curved flow path 28 extends substantially horizontally on the upstream side of the first curved flow path 28 (see FIGS. 6C to 6E ), but slopes downward from the inner periphery toward the outer periphery near the main channel 26 (see FIG. 6B ). In other words, the lower end of the outer side surface 28c is located lower than the lower end of the inner side surface 28d near the main channel 26. Thus, the cross section of the first curved flow path 28 is configured such that the height dimension of the outer side surface 28c is greater than the height dimension of the inner side surface 28d near the main channel 26.

[0048] 6F to 6H, the upper surface 28a of the first curved flow path 28 is inclined upward from the inner circumferential side toward the outer circumferential side on the downstream side of the first curved flow path 28. In other words, the upper end of the outer side surface 28c is located higher than the upper end of the inner side surface 28d. Furthermore, the bottom surface 28b of the first curved flow path 28 extends in a substantially horizontal direction on the downstream side of the first curved flow path 28.

[0049] As shown in FIGS. 6F to 6H, the flow path cross section of the first bent flow path 28 is formed into a vertically elongated shape in which the vertical width dimension H is longer than the horizontal width dimension W on the downstream side of the first bent flow path 28. The horizontal width dimension W of the first bent flow path 28 is set so that the horizontal width dimension W2 is smallest and the vertical width dimension H2 is largest in the region where the first bent flow path 28 makes a U-turn with the smallest radius of curvature (the position of the VIG cross section in FIG. 5). As shown in FIG. 6G, at the position where the horizontal width dimension W2 is smallest, the vertical width dimension H2 is set to be at least two times, preferably at least three times, larger than the horizontal width dimension W2. In addition, the flow path cross-sectional area of ​​the first bent flow path 28 is set to be approximately constant on the downstream side.

[0050] As shown in FIG. 6I, the flow path cross section of the outlet flow path 32 is set so that the horizontal width dimension W and the vertical width dimension H are approximately the same. The horizontal width dimension w1 of the outlet flow path 32 is set so as to be larger than the horizontal width dimensions W1 to W3 of the first bent flow path 28. Specifically, the horizontal width dimension w1 of the outlet flow path 32 is set so as to be equal to or larger than the sum of the horizontal width dimensions W2 of the first bent flow path 28 and the second bent flow path 30 at the position where the horizontal width dimension W is smallest (the position of the VIG cross section in FIG. 5). Furthermore, the vertical width dimension h1 of the outlet flow path 32 is set so as to be smaller than the vertical width dimensions H1 to H3 of the first bent flow path 28. The flow path cross-sectional area of ​​the outlet flow path 32 is set so as to be smaller than the sum of the flow path cross-sectional area of ​​the first bent flow path 28 and the flow path cross-sectional area of ​​the second bent flow path 30, which is positioned symmetrically to the first bent flow path 28 with respect to the central axis CL. Furthermore, the flow path cross-sectional area of ​​the outlet flow path 32 is set so as to gradually decrease from the upstream side to the downstream side. This allows the flow rate of the cleaning water to increase as it passes through the outlet flow path 32 .

[0051] 6A and 6B to 6H, the cross-sectional area of ​​each of the first bent channels 28 is set to be smaller than the cross-sectional area of ​​the main channel 26. Specifically, the cross-sectional area of ​​each of the first bent channels 28 is set to be half or less of the cross-sectional area of ​​the main channel 26. As a result, the first bent channels 28 are made smaller than conventional products.

[0052] Next, the flushing operation of the flush toilet 1 according to an embodiment of the present invention will be described with reference to Figures 2 and 7A to 7C. Figure 7A is a schematic diagram showing the flow of flush water in the early stages of flushing in a flush toilet according to an embodiment of the present invention, Figure 7B is a schematic diagram showing the flow of flush water in the middle stages of flushing in a flush toilet according to an embodiment of the present invention, and Figure 7C is a schematic diagram showing the flow of flush water in the final stages of flushing in a flush toilet according to an embodiment of the present invention.

[0053] First, as shown in Figure 2, in the standby state before the start of toilet flushing, seal water W has accumulated up to seal water level WL0 in the basin portion 24 of the bowl portion 6 and in the drain trap pipe 8. Flush water has also accumulated in the jet water conduit 16 up to seal water level WL0, and the first bent flow path 28 and second bent flow path 30 of the jet water conduit 16 are full. In other words, there is no air in the first bent flow path 28 and second bent flow path 30 of the jet water conduit 16. Furthermore, flush water has accumulated in the main water conduit 26 of the jet water conduit 16 up to seal water level WL0, and air is present above the flush water.

[0054] Next, when the user operates the lever handle, a rim drain valve (not shown) in the flush water tank 4 opens and flush water is discharged from the rim spout 10 into the bowl section 6. After a predetermined time has passed since the rim drain valve opened, a jet drain valve (not shown) in the flush water tank 4 opens.

[0055] As shown in Figure 7A, when the jet drain valve is opened, flush water in the flush water tank 4 is supplied from the jet drain outlet 4c into the jet water conduit 16. The flush water supplied from the flush water tank 4 collides with the bottom surface 26b of the main conduit 26, and then flows along the bottom surface 26b of the main conduit 26. Here, when the flush water supplied from the flush water tank 4 flows into the main conduit 26, the momentum of the flush water causes some of the air that was present in the main conduit 26 in the standby state to be discharged to the outside from the jet drain outlet 4c, through an overflow pipe (not shown) provided in the flush water tank 4.

[0056] As shown in Figure 7B, after a predetermined time has passed, flush water supplied to main conduit 26 washes away flush water that has accumulated in first bent flow path 28 and second bent flow path 30, and the flush water is discharged from jet spout 14. Also, while flush water is flowing through main conduit 26, air that was present within main conduit 26 in the standby state is collected and retained in space S (the area indicated by the dash-dotted line in Figure 7B) formed in main conduit 26. This separates the flush water flowing through main conduit 26 from the retained air, and prevents the air within main conduit 26 from being discharged from jet spout 14 together with the flush water. When flush water is discharged from jet spout 14 towards inlet 8a of drain trap pipe 8, drain trap pipe 8 becomes full, a siphon action occurs in a relatively short time, and waste is discharged.

[0057] As shown in Figure 7C, when siphon action occurs, the seal water W drops to seal water level WL1, the jet drain valve closes, and jet water spouting stops. At this time, air enters the jet water conduit 16 from the overflow pipe, and also enters the jet water conduit 16 from the jet water spout 14, which is open to the atmosphere. This replaces the air inside the first bent flow path 28 and the second bent flow path 30, and the full water state can be reset. Thereafter, flush water continues to be spouted from the rim spout 10 into the bowl section 6, returning the seal water W to its initial state, water is supplied to the flush water tank 4, and the toilet flush ends.

[0058] The effects of the first embodiment described above will be described below. First, according to the flush toilet 1 of this embodiment, the first bent flow path 28 and the second bent flow path 30 are positioned below the top 8d of the drain trap pipe 8 and are configured to be full with water in the standby state before the toilet flushing starts, so that in the standby state before the toilet flushing starts, there is no air in the first bent flow path 28 and the second bent flow path 30, and it is possible to prevent air from being discharged from the jet water spout 14 together with the flush water. This allows the flush water to be forcefully discharged from the jet water spout 14, thereby enabling waste to be sufficiently discharged.

[0059] Furthermore, according to the flush toilet 1 of this embodiment, the first bent flow path 28 and the second bent flow path 30 of the jet water conduit 16 are positioned within the area where the water seal W is formed in a plan view, so that the first bent flow path 28 and the second bent flow path 30 can be reliably filled with water in the standby state before the start of toilet flushing.

[0060] According to the flush toilet 1 of this embodiment, the angle of inclination α at which the top surface 26a of the main waterway 26 slopes downward relative to the horizontal is set to be greater than the angle of inclination β at which the bottom surface 26b of the main waterway 26 slopes downward relative to the horizontal, so it is possible to form a space S in which air can stagnate within the main waterway 26. This allows air to stagnate within the main waterway 26, preventing the air from being discharged from the jet spout 14 together with the flush water.

[0061] Furthermore, according to the flush toilet 1 of this embodiment, the seal water level WL1 drops during toilet flushing, and air flows in from the jet water outlet 14, so the air inside the first curved flow path 28 and the second curved flow path 30 can be replaced with air.

[0062] According to the flush toilet 1 of this embodiment, the upper surfaces 28a, 30a of the first bent flow path 28 and second bent flow path 30 of the jet water conduit 16 are inclined downward from the upstream side to the downstream side, so that flush water flowing through the jet water conduit 16 can be smoothly guided downstream. Additionally, air that flows in from the jet water spout 14 can be smoothly guided upstream, preventing air from remaining in the first bent flow path 28 and second bent flow path 30 during the standby state before the start of toilet flushing.

[0063] Furthermore, according to the flush toilet 1 of this embodiment, the flow path cross-sections of the first bent flow path 28 and the second bent flow path 30 of the jet water conduit 16 are set so that the height dimension of the outer side surface 28c is greater than the height dimension of the inner side surface 28d near the main waterway 26, so that the flow path cross-sectional area can be increased while avoiding interference with the drain trap pipe 8 adjacent to the first bent flow path 28 and the second bent flow path 30, thereby suppressing pressure loss in the flush water flowing through the first bent flow path 28 and the second bent flow path 30.

[0064] According to the flush toilet 1 of this embodiment, the curved flow path has a first curved flow path 28 that branches off from the main waterway 26, bends to the left and extends forward, and a second curved flow path 30 that branches off from the main waterway 26, bends to the right and extends forward, and the first curved flow path 28 and the second curved flow path 30 merge at their downstream ends and are connected to the outlet flow path, so that flush water can be forcefully sprayed from the jet water outlet 14.

[0065] Furthermore, with the flush toilet 1 of this embodiment, the jet water conduit 16 and the rim water conduit 12 are formed separately, so the head pressure of the flush water stored in the flush water tank 4 can be applied relatively early, causing the flush water to be forcefully discharged from the jet water outlet 14.

[0066] Although the embodiment of the present invention has been described above, various modifications can be made to the above-described embodiment. [Explanation of symbols]

[0067] 1: Flush toilet 4: Cleaning water tank 4c: Jet drain port of cleaning water tank 6: Bowl section 8: Drain trap pipe 8a: Inlet of drain trap pipe 8b: Drain trap pipe riser 8c: Downstream pipe of drain trap pipe 8d: Top of drain trap pipe 10: Rim spout 12: Rim waterway 14: Jet water outlet 16: Jet waterway 18: Waste receiving surface 20: Rim 24: Pressure points 24a: Back wall of the acupoint 24b: Side wall of the pot 26: Leading waterway 26a: Top of main channel 26b: Bottom of main channel 28: First bent channel 28a: Upper surface of the first curved flow path 28b: Bottom surface of the first bent flow path 28c: Outer side of the first bent channel 28d: Inner side of the first bent channel 30: Second bent channel 30a: Upper surface of the second curved flow path 30b: bottom surface of second curved flow path 32: Outlet channel 32a: Top surface of outlet channel 32b: Bottom surface of outlet channel

Claims

1. A siphon jet flush toilet, a bowl portion including a bowl-shaped waste receiving surface, a rim portion formed above the waste receiving surface, and a pot portion formed below the waste receiving surface and having a water seal formed therein; a drain trap pipe provided below the bowl portion and including an ascending pipe extending upward, a descending pipe extending downward from the ascending pipe, and a top portion located between the descending pipe and the ascending pipe and defining a seal water level; a rim spout provided in the rim portion for spouting flush water toward the bowl portion; a jet spout provided below the bowl portion and spouting flush water toward an inlet of the drain trap pipe; a rim waterway that guides flush water to the rim outlet; a jet waterway that guides wash water to the jet outlet; a water supply source provided above the top of the drain trap pipe and supplying wash water to the jet water conduit; and the jet water conduit has a main water conduit extending forward from the water supply source, a curved flow path bending from the main water conduit and extending forward, and an outlet flow path extending rearward from the curved flow path and connecting to the jet water outlet, A flush toilet characterized in that the curved flow path is positioned below the top of the drain trap pipe and is configured to be filled with water when in a standby state before the start of toilet flushing.

2. The flush toilet according to claim 1, wherein the curved flow path of the jet water conduit is disposed within an area where a water seal is formed in a plan view.

3. 3. The flush toilet according to claim 2, wherein the angle at which the top surface of the main waterway slopes downward relative to the horizontal is set to be greater than the angle at which the bottom surface of the main waterway slopes downward relative to the horizontal.

4. 4. The flush toilet according to claim 1, wherein the flush toilet is configured so that the seal water level drops during toilet flushing, allowing air to flow in through the jet water spout.

5. 2. The flush toilet according to claim 1, wherein the upper surface of the curved flow path of the jet water conduit slopes downward from the upstream side to the downstream side.

6. 2. The flush toilet according to claim 1, wherein the cross section of the curved flow path of the jet waterway is set so that the height dimension of the outer side surface is greater than the height dimension of the inner side surface near the main waterway.

7. 2. The flush toilet according to claim 1, wherein the curved flow path has a first curved flow path that branches off from the main waterway, bends to the left and extends forward, and a second curved flow path that branches off from the main waterway, bends to the right and extends forward, and the first curved flow path and the second curved flow path join at their downstream ends and are connected to the outlet flow path.

8. 2. The flush toilet according to claim 1, wherein the jet water channel and the rim water channel are formed separately.

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