Water-washable toilet

Abstract

To provide a flush toilet that allows for greater design freedom while suppressing a decrease in yield. [Solution] The present invention relates to a flush toilet (1) that performs flushing using flushing water stored in a flushing water tank, comprising a bowl portion (4), a drain trap pipe (6) communicating with the lower part of the bowl portion, and a rim water channel (8) that guides the flushing water stored in the flushing water tank (2) to a rim outlet (4a) formed on the upper edge of the bowl portion, wherein the rim water channel is composed of a single component and consists of an integrated component (8b) into which flushing water flows from the flushing water tank, and a composite component (8c) made up of multiple components that extends from the downstream end of the integrated component to the rim outlet.

Description

Technical Field

[0001] The present invention relates to a flush toilet, and more particularly to a flush toilet that performs flushing using flushing water stored in a flushing water tank.

Background Art

[0002] Japanese Laid-Open Patent Publication No. 2018-80504 (Patent Document 1) describes a flush toilet. This flush toilet is configured by joining a body part and a rim part, and a bowl part, a drain trap pipeline, a rim water passage, and the like are formed by these components. The rim water passage is entirely configured between the body part and the rim part that are joined to each other. That is, the inner wall surface constituting the rim water passage is composed of a part of the upper surface of the body part and a part of the lower surface of the rim part, and by joining the rim part onto the body part, the rim water passage is formed as a space between these members.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, as in the flush toilet described in Patent Document 1, if the entire long rim water passage extending from the rear to the front is configured by bonding the body part and the rim part, the bonding surface becomes long, which causes a problem of reduced manufacturing yield.

[0005] Furthermore, if the lower inner wall surface of the rim water passage is to be formed as part of the body, it is necessary to support this inner wall surface from below the body. For this reason, if the lower inner wall surface of the rim water passage is to be provided in a portion that extends behind the bowl, it is necessary to specially provide a support wall or the like below the rim water passage to support it. Such a support wall is undesirable in terms of the appearance of the flush toilet, and in order to maintain a good appearance, the flush toilet needs to be made into a full-skirt type so that the support wall is hidden. For this reason, if the rim water passage is configured as in the flush toilet described in Patent Document 1, there is a problem that design constraints arise.

[0006] Therefore, the present invention aims to provide a flush toilet that can expand design freedom while suppressing a decrease in yield. [Means for solving the problem]

[0007] To solve the above-mentioned problems, the present invention provides a flush toilet that performs flushing using flushing water stored in a flushing water tank, comprising a bowl section, a drain trap pipe communicating with the lower part of the bowl section, and a rim water channel that guides the flushing water stored in the flushing water tank to a rim outlet formed on the upper edge of the bowl section, wherein the rim water channel is composed of a single component and is characterized by comprising an integrated component into which flushing water flows from the flushing water tank, and a composite component made up of multiple components that extends from the downstream end of the integrated component to the rim outlet.

[0008] According to the present invention configured in this way, the rim water channel that guides the flushing water stored in the flushing water tank to the rim outlet is composed of an integrated component made from a single part and a composite component made from multiple parts downstream of the integrated component. This allows for a reduction in the bonding surface required to form the rim water channel, thereby improving the yield when manufacturing flush toilets. Furthermore, since the upstream side of the rim water channel is an integrated component made from a single part, it becomes possible to omit support walls and the like to support the integrated component, thereby increasing design flexibility.

[0009] In the present invention, preferably, the joint surface between the integral component and the composite component is located lower than the bottom surface of the downstream end of the integral component.

[0010] According to the present invention configured in this way, since the joint surface between the integrated component and the composite component is located lower than the bottom surface of the downstream end of the integrated component, a drop is created between the bottom surface of the downstream end of the integrated component and the bottom surface of the composite component. As a result, kinetic energy is imparted to the cleaning water as it falls down the drop, increasing the flow velocity of the cleaning water discharged from the rim outlet.

[0011] In the present invention, preferably, the bottom surface of the rim outlet is located lower than the bottom surface of the downstream end of the integrated component.

[0012] According to the present invention configured in this way, since the bottom surface of the rim outlet is lower than the bottom surface of the downstream end of the integrated component, even if there is a step between the integrated component and the composite component, the cleaning water inside the composite component can be discharged from the rim outlet, preventing cleaning water from remaining inside the composite component.

[0013] In the present invention, preferably, the flow channel cross-sectional area of ​​the rim outlet is configured to be smaller than the flow channel cross-sectional area at the downstream end of the integrated component.

[0014] With the present invention configured in this way, the flow path cross-sectional area of ​​the rim outlet is smaller than the flow path cross-sectional area at the downstream end of the integrated component, so that the flow path cross-sectional area can be narrowed within the composite component of the rim water channel, and the flow velocity of the cleaning water discharged from the rim outlet can be increased.

[0015] In the present invention, preferably, the rim water channel extends in the front-to-back direction of the flush toilet from the flush water tank located behind the bowl to the rim water outlet, and the downstream end of the integrated component is located behind the center point of the rim water channel in the front-to-back direction.

[0016] With the present invention configured in this way, the downstream end of the integrated component is located behind the center point in the front-rear direction of the rim water channel, so the rim water channel can be formed smoothly using the integrated component and the composite component.

[0017] Preferably, the present invention further includes a skirt portion that covers the periphery of the bowl portion, and the downstream end of the integrated component is located in front of the rear end of the skirt portion.

[0018] According to the present invention configured in this way, since the downstream end of the integrated component is located in front of the rear end of the skirt component, the composite component connected to the front of the integrated component is provided in front of the rear end of the skirt component. For this reason, even if a support wall or the like is provided to support the composite component of the rim water channel, the support wall or the like is covered and hidden by the skirt component, and a good appearance can be maintained.

[0019] In the present invention, preferably, there is further a jet water channel that guides the flushing water to the jet outlet, and this jet water channel is provided closer to the center in the width direction of the toilet bowl than the rim water channel and is composed of multiple parts.

[0020] According to the present invention configured in this way, a flush toilet is provided with a rim water channel and a jet water channel located closer to the center in the width direction than the rim water channel. When two water channels are provided side by side in the width direction of a flush toilet, the mold for forming them tends to become complicated. However, by constructing the jet water channel from multiple parts and the rim water channel from an integrated part and a composite part, it is possible to simplify the structure of the mold and make molding easier. [Effects of the Invention]

[0021] According to the flush toilet of the present invention, it is possible to suppress a decrease in yield while expanding the degree of design freedom. [Brief explanation of the drawing]

[0022] [Figure 1]FIG. 1 is a side cross-sectional view of a flush toilet according to an embodiment of the present invention. [Figure 2] FIG. 2 is a top view of the flush toilet according to the embodiment of the present invention. [Figure 3] FIG. 3 is an enlarged cross-sectional view showing a rim water guide passage formed inside the flush toilet according to the embodiment of the present invention. [Figure 4] FIG. 4 is a perspective view of a rim portion constituting the flush toilet according to the embodiment of the present invention, viewed from obliquely below. [Figure 5] FIG. 5 is a perspective view of a body portion constituting the flush toilet according to the embodiment of the present invention, viewed from obliquely above. [Mode for Carrying Out the Invention]

[0023] Next, the flush toilet according to the embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side cross-sectional view of the flush toilet according to the embodiment of the present invention. FIG. 2 is a top view of the flush toilet according to the embodiment of the present invention.

[0024] As shown in FIG. 1 and FIG. 2, the flush toilet 1 according to the embodiment of the present invention includes a flush water tank 2 storing flush water, a bowl portion 4, and a drain trap pipe line 6 communicating with a lower portion of the bowl portion 4. The downstream end of the drain trap pipe line 6 is connected via a drain socket to a drain pipe (all not shown) provided on the floor surface of a toilet room.

[0025] A single rim water discharge port 4a is provided at the upper edge of the bowl portion 4, and a jet water discharge port 4b is provided at the lower portion of the bowl portion 4. In the present embodiment, only one rim water discharge port 4a is provided on the upper end and right side surface of the bowl portion 4, and opens toward the front. In the present embodiment, the jet water discharge port 4b opens at the bottom of the bowl portion 4 so as to face the inlet of the drain trap pipe line 6. Further, a shelf surface 4c is provided on the entire circumference of the upper edge of the bowl portion 4, and the shelf surface 4c has a gentler slope (closer to horizontal) than the surface of the bowl portion 4 inside the shelf surface 4c.

[0026] During toilet flushing, flushing water stored in the flushing water tank 2 is discharged from the rim outlet 4a and the jet outlet 4b, flushing the bowl section 4. Specifically, the flushing water discharged from the rim outlet 4a flows onto the shelf surface 4c and swirls clockwise within the bowl section 4. The flushing water on the shelf surface 4c flows inward along the surface of the bowl section 4 while swirling, forming a swirling flow within the bowl section 4. The flushing water discharged from the jet outlet 4b flows into the drain trap pipe 6, which is located opposite it. As flushing water flows in from the rim outlet 4a and the jet outlet 4b, the flushing water in the bowl section 4 overflows the top 6a of the drain trap pipe 6 and flows out from the downstream end 6b of the drain trap pipe 6.

[0027] The flushing water flowing out from the downstream end 6b of the drain trap pipe 6 flows into the drain socket (not shown), where a siphon effect is induced. Due to the siphon effect, the flushing water and waste in the bowl 4 are drawn into the drain trap pipe 6, and the flushing water and waste in the bowl 4 flow out into the drain socket. The flushing water and waste that flow into the drain socket are discharged through the pipe inside the drain socket to the drain piping (not shown) on the floor of the toilet room. When the toilet is waiting to be flushed, water is stored in the bowl 4, and the water level W of this stored water is determined by the height of the top 6a of the drain trap pipe 6.

[0028] Furthermore, as shown in Figure 2, a rim drain valve 2a and a jet drain valve 2b are located inside the cleaning water tank 2, respectively. By opening these drain valves, cleaning water is discharged from the rim outlet 4a and the jet outlet 4b of the bowl section 4, respectively.

[0029] Specifically, a rim drain (not shown) is provided on the bottom of the flushing water tank 2, and this rim drain is connected to the rim outlet 4a via a rim water channel 8 formed inside the flush toilet 1. By opening the rim drain valve 2a, the flushing water in the flushing water tank 2 is discharged through the rim drain (not shown) and discharged from the rim outlet 4a. In this embodiment, the rim drain (not shown) and the rim drain valve 2a on the bottom of the flushing water tank 2 are positioned eccentrically to the right of the center in the width direction of the flush toilet 1 when viewed from above. The specific configuration of the rim water channel 8 will be described later.

[0030] Similarly, a jet drain (not shown) is provided on the bottom of the flushing water tank 2, and this jet drain is connected to the jet outlet 4b via a jet water channel 10 formed inside the flush toilet 1. By opening the jet drain valve 2b, the flushing water in the flushing water tank 2 is discharged through the jet drain (not shown) and discharged from the jet outlet 4b.

[0031] In this embodiment, the jet drain valve 2b and the jet drain outlet (not shown) are located in the center of the width direction of the flush toilet 1 when viewed from above. The jet water channel 10 extends from the jet drain outlet (not shown) towards the front of the flush toilet 1 along the center of the width direction of the flush toilet 1, then branches into two, passes through both sides of the drain trap pipe 6, and rejoins at the front of the bowl section 4, where it is connected to the jet outlet 4b.

[0032] Next, the structure of the rim water channel 8 will be described with reference to Figures 3 to 5. Figure 3 is an enlarged cross-sectional view showing the rim water channel 8 formed inside the flush toilet 1. Figure 4 is a perspective view of the rim, one of the components of the flush toilet 1, seen from diagonally below. Figure 5 is a perspective view of the body, another component of the flush toilet 1, seen from diagonally above.

[0033] As shown in Figure 3, the rim water channel 8 extends in the front-to-back direction of the flush toilet 1 as a whole, connecting the rim water inlet 8a and the rim water outlet 4a. The rim water inlet 8a is the inlet for flushing water located at the upstream end of the rim water channel 8. Specifically, the rim water inlet 8a is a circular opening located directly below the rim drain valve 2a and the rim drain outlet (not shown) in the flushing water tank 2, and is configured to allow flushing water discharged from the rim drain outlet to flow in. In this embodiment, the rim water inlet 8a is located eccentrically to the right of the center in the width direction of the flush toilet 1, and the rim water outlet 4a is located on the right side of the bowl portion 4.

[0034] Furthermore, as shown in Figure 3, the rim water channel 8 is composed of an integrated component 8b located on the upstream side and a composite component 8c extending from the downstream end of the integrated component 8b to the rim discharge port 4a. The integrated component 8b consists of a single part that forms part of the flush toilet 1, and is configured to receive flushing water from the flushing water tank 2. The composite component 8c consists of multiple parts that form part of the flush toilet 1, and is connected to the downstream end of the integrated component 8b.

[0035] Next, the structure of the integrated component 8b and the composite component 8c of the rim water conduit 8 will be described with reference to Figures 4 and 5. First, the flush toilet 1 of this embodiment consists of a rim portion 1a shown in Figure 4, a body portion 1b shown in Figure 5, and a tank portion (not shown). That is, in the flush toilet 1 of this embodiment, the rim portion 1a, body portion 1b, and tank portion, which are parts that make up a part of the flush toilet 1, are formed by molding a slurry using a mold. Next, after bonding these rim portion 1a, body portion 1b, and tank portion together, firing completes a one-piece ceramic flush toilet 1.

[0036] As shown in Figure 4, the rim portion 1a is a component that makes up the upper part of the flush toilet 1 and is a plate-shaped member as a whole. At the front of the rim portion 1a, an elliptical bowl opening 12a is formed, which makes up the opening above the bowl portion 4. At the rear of the rim portion 1a, a circular jet drain port 12b is formed, which is a jet drain port that allows flushing water from the flushing water tank 2 to flow into the jet water channel 10.

[0037] Furthermore, a jet recess 12c is provided on the lower surface of the rim portion 1a, surrounding the jet drain port 12b. This jet recess 12c is formed in the center of the width direction of the rim portion 1a so as to extend forward from the jet drain port 12b. When the rim portion 1a and the body portion 1b are joined, the jet recess 12c constitutes a part of the jet water channel 10. That is, the inner surface of the jet recess 12c constitutes the upper part of the ceiling surface and side wall surface of the jet water channel 10 when the rim portion 1a and the body portion 1b are bonded together.

[0038] Furthermore, an integrated component 8b of the rim water channel 8 and a recess 13 for the rim are provided on the lower side of the rim portion 1a, extending in the front-rear direction of the flush toilet 1. The integrated component 8b is a hollow tubular portion provided on the lower surface of the rim portion 1a and communicates with the rim water inlet 8a (Figure 3) which opens on the upper surface of the rim portion 1a. The integrated component 8b extends forward from the rim water inlet 8a at the rear of the flush toilet 1. In other words, the integrated component 8b is a flow path integrally formed inside the rim portion 1a, which is a single component, and constitutes a part of the rim water channel 8.

[0039] Furthermore, as shown in Figure 4, the jet recess 12c (jet water channel 10) is located in the center of the width direction of the rim portion 1a (flush toilet 1), and the integrated component 8b (rim water channel 8) is located on the side of the rim portion 1a (flush toilet 1). In other words, the jet water channel 10 is located closer to the center of the width direction of the flush toilet 1 than the rim water channel 8.

[0040] The rim recess 13 is provided on the lower surface of the rim portion 1a and is an elongated recess that extends in the front-rear direction of the flush toilet 1 so as to communicate with the front end of the integrated component 8b, and extends to the rim outlet 4a at the front end. The width of the rim recess 13 is set to be approximately the same as the width of the water passage formed inside the integrated component 8b at the rear end (upstream end). The width of the rim recess 13 is set to be wider at the rear end (upstream end) and narrower towards the front end (downstream end), being narrowest at the rim outlet 4a. Furthermore, the depth of the rim recess 13 is set to be deeper at the rear end (upstream end) and shallower towards the front end (downstream end), being shallowest at the rim outlet 4a.

[0041] The rim recess 13 forms a composite component 8c, which is part of the rim water channel 8, when the rim portion 1a and the body portion 1b are joined, and the front end of the rim recess 13 forms part of the rim outlet 4a. That is, the inner surface of the rim recess 13 forms the upper part of the ceiling surface and side wall surface of the composite component 8c when the rim portion 1a and the body portion 1b are joined. In addition, the front end of the rim recess 13 forms the upper part of the top edge and side edge of the rim outlet 4a.

[0042] Furthermore, an outer peripheral bonding surface 12d is provided on the periphery of the lower surface of the rim portion 1a, and a bowl bonding surface 12e is provided around the bowl opening 12a. When bonding the rim portion 1a and the body portion 1b, these outer peripheral bonding surfaces 12d, bowl bonding surfaces 12e, etc. are bonded to the body portion 1b and integrated together.

[0043] On the other hand, as shown in Figure 5, the body portion 1b is a component that forms the main body of the flush toilet 1. A bowl portion 4 is formed on the front side of the body portion 1b so as to open upward, and a drain trap pipe 6 and a jet water channel 10 are formed inside the body portion 1b.

[0044] Furthermore, a jet recess 14a is provided on the upper surface of the body portion 1b at a position corresponding to the jet recess 12c (Figure 4) of the rim portion 1a. This jet recess 14a is formed in the center of the width direction of the body portion 1b and extends forward from the rear end of the body portion 1b. The jet recess 14a is also in communication with a jet water channel 10 (Figures 1 and 2) provided inside the body portion 1b, and the jet water channel 10 extends to the jet outlet 4b which opens at the bottom of the bowl portion 4.

[0045] Furthermore, when the rim portion 1a and the body portion 1b are joined, the jet recess 14a, together with the jet recess 12c of the rim portion 1a, forms a hollow conduit and constitutes the upstream portion of the jet water conduit 10. That is, the jet water conduit 10 is composed of multiple parts, the rim portion 1a and the body portion 1b, and the inner surface of the jet recess 14a constitutes the lower part of the floor surface and side wall surface of the jet water conduit 10 when the rim portion 1a and the body portion 1b are joined.

[0046] Furthermore, a support wall 14b is provided below the rear end of the jet recess 14a to support the jet recess 14a. The support wall 14b is a vertical wall provided on the underside of the jet recess 14a to support the jet recess 14a from below, and extends in the front-rear direction through the center of the width direction of the flush toilet 1. By providing this support wall 14b, it is prevented that the jet recess 14a will bend downward under its own weight when the body portion 1b is formed from slurry. Thus, the rear part of the jet water channel 10 is supported by the support wall 14b, while the rear part (upstream side) of the rim water channel 8 is provided integrally with the rim portion 1a as an integral component 8b. For this reason, in the flush toilet 1 of this embodiment, no special support wall or the like is provided to support the rim water channel 8.

[0047] Furthermore, a rim recess 16 is provided on the upper side of the body portion 1b at a position corresponding to the rim recess 13 (Figure 4) of the rim portion 1a. This rim recess 16 is configured to extend in the front-rear direction of the body portion 1b on one side of the body portion 1b. Moreover, when the rim portion 1a and the body portion 1b are joined, the rim recess 16, together with the rim recess 13 of the rim portion 1a, forms a hollow pipe with a substantially rectangular cross-section, constituting the downstream portion of the rim water conduit 8. That is, the rim recess 13 of the rim portion 1a and the rim recess 16 of the body portion 1b are joined together to form a composite component 8c of the rim water conduit 8, and the front end of the rim recess 16 constitutes a part of the rim outlet 4a.

[0048] Thus, the composite component 8c of the rim water channel 8 is composed of multiple parts (rim portion 1a and body portion 1b) by combining the rim recess 13 of the rim portion 1a and the rim recess 16 of the body portion 1b. The inner surface of the rim recess 16 forms the lower part of the floor surface and side wall surface of the composite component 8c of the rim water channel 8 when the rim portion 1a and body portion 1b are joined together. The front end of the rim recess 16 forms the lower part of the lower edge and side edge of the rim outlet 4a.

[0049] Furthermore, the bottom surface of the rim recess 16 is sloped downwards toward the front of the flush toilet 1 (Figure 3), and is lowest at the rim outlet 4a at its front end. In addition, the width of the rim recess 16 is wider at the rear end (upstream end) and narrows toward the front end (downstream end), and is narrowest at the rim outlet 4a.

[0050] Furthermore, a raised portion 16a is provided at the rear end of the rim recess 16, and this raised portion 16a protrudes upward from the rim recess 16. Therefore, when the rim portion 1a and the body portion 1b are bonded together, the raised portion 16a is inserted into the rim recess 13 of the rim portion 1a (Figure 3). The upper surface of the raised portion 16a is highest at the rear end (upstream end) and slopes downward towards the front end (downstream end). The front end of the raised portion 16a smoothly connects with the bottom surface of the rim recess 16. That is, the depth of the rim recess 16 becomes shallower towards the rear, and the depth of the rim recess 16 becomes zero at the rear end. At the rear end of the rim recess 16, a raised portion 16a is formed that protrudes upward from the rim recess 16 and is continuous with its bottom surface. The upper surface of the raised portion 16a constitutes part of the floor surface of the rim water channel 8.

[0051] On the other hand, the body portion 1b is provided with a skirt portion 14c that covers the perimeter of the bowl portion 4. This skirt portion 14c is a curved wall surface that extends in a U-shape when viewed from above, and extends from the front end to the rear end of the flush toilet 1.

[0052] Furthermore, an outer peripheral bonding surface 14d is provided on the periphery of the upper end of the body portion 1b (skirt portion 14c), and a bowl bonding surface 14e is provided around the bowl portion 4. When bonding the rim portion 1a and the body portion 1b, these outer peripheral bonding surfaces 14d and bowl bonding surfaces 14e are bonded to the outer peripheral bonding surface 12d and bowl bonding surface 12e (Figure 4) of the rim portion 1a, respectively, and integrated.

[0053] Next, referring again to Figure 3, the structure of the rim water channel 8 will be described in detail. As shown in Figure 3, the rim water channel 8 extends in the front-rear direction of the flush toilet 1 from the flush water tank 2 located behind the bowl section 4 to the rim outlet 4a. The rim water channel 8 is composed of an integrated component 8b provided on the upstream side and a composite component extending from the downstream end of this integrated component 8b to the rim outlet 4a. Also, as shown in Figure 3, the downstream end of the integrated component 8b is located behind the center point C in the front-rear direction of the rim water channel 8 in a side view.

[0054] Furthermore, the downstream end of this integrated component 8b is located in front of the rear end of the skirt portion 14c (Figure 5) that surrounds the bowl portion 4 when viewed from the side. Therefore, the composite component 8c connected to the front of the integrated component 8b is provided in front of the rear end of the skirt portion 14c. As a result, even if a support wall or the like is provided to support the composite component 8c of the rim water channel 8, the support wall or the like is covered by the skirt portion 14c, and a good appearance can be maintained.

[0055] Furthermore, the ceiling surface of the rim water channel 8 extends substantially horizontally across the entire integrated component 8b and at the upstream end of the composite component 8c, and is configured to become lower toward the rim outlet 4a in the downstream portion of the composite component 8c. That is, in the integrated component 8b of the rim water channel 8, the ceiling surface extends substantially horizontally, and in the composite component 8c, the ceiling surface extends substantially horizontally at the upstream end (above the raised portion 16a), and becomes lower toward the downstream side. The ceiling surface of the rim water channel 8 is lowest at the rim outlet 4a.

[0056] On the other hand, the bottom surface of the rim water channel 8 is formed to be highest near the downstream end of the integrated component 8b and near the upstream end of the composite component 8c, and lower on both sides. The upper surface of the raised portion 16a that constitutes the bottom surface at the upstream end of the composite component 8c is at approximately the same height as the bottom surface 13a at the downstream end of the integrated component 8b. Furthermore, a small gap is provided between the rear end (upstream end) of the raised portion 16a of the composite component 8c and the front end (downstream end) of the bottom surface 13a of the integrated component 8b. This ensures that the integrated component 8b and the composite component 8c of the rim water channel 8 can be reliably connected even if there are dimensional errors in the separately molded rim portion 1a and body portion 1b.

[0057] This configuration allows flushing water to remain in the portion of the rim water channel 8 upstream of the downstream end of the integrated component 8b, even when the toilet is in standby mode. Specifically, a deeper water reservoir 13d is formed in the portion of the rim water channel 8 upstream of the rim water inlet 8a. On the other hand, the bottom surface of the composite component 8c of the rim water channel 8 slopes down monotonically from the upstream end of the raised portion 16a downstream to the rim water outlet 4a, and is lowest at the rim water outlet 4a.

[0058] As described above, the bottom surface 13a at the downstream end of the integrated component 8b is at approximately the same height as the top surface at the upstream end of the raised portion 16a. Therefore, the bottom surface of the rim outlet 4a is lower than the bottom surface 13a at the downstream end of the integrated component 8b. Consequently, the flushing water downstream of the upstream end of the raised portion 16a (the downstream end of the integrated component 8b) flows out from the lower-positioned rim outlet 4a, and no flushing water remains after the toilet is flushed.

[0059] Furthermore, a stepped portion 16b (Figure 5) is provided behind the raised portion 16a at the same height as the upper edge of the rim recess 16. On the other hand, as shown in Figure 3, a vertical wall 13b extending downward is provided at the downstream end of the integrated component 8b. The lower end surface 13c (Figure 4) of this vertical wall 13b abuts against the stepped portion 16b behind the raised portion 16a when the rim portion 1a and the body portion 1b are combined, and they are bonded together. Therefore, the lower end surface 13c of the vertical wall 13b and the stepped portion 16b constitute the joint surface between the integrated component 8b and the composite component 8c of the rim water channel 8. Consequently, the joint surface between the integrated component 8b and the composite component 8c is located lower than the bottom surface 13a at the downstream end of the integrated component 8b. Note that, as shown in Figure 4, the lower end surface 13c of the vertical wall 13b is at the same height as the edge of the rim recess 13.

[0060] Furthermore, as described above, the width of the water channel at the downstream end of the integrated component 8b is configured to be approximately the same as the width at the upstream end of the composite component 8c (rim recesses 13 and 16). The width of the composite component 8c (rim recesses 13 and 16) is wider at the upstream end and narrows towards the downstream end, becoming narrowest at the rim outlet 4a. As a result, the cross-sectional area of ​​the flow path at the rim outlet 4a is smaller than the cross-sectional area of ​​the flow path at the downstream end of the integrated component 8b.

[0061] Next, the operation of the flush toilet 1 according to an embodiment of the present invention will be described. First, when a user of the flush toilet 1 operates the control unit (not shown) to flush the toilet, the rim drain valve 2a (Figure 2) located in the flush water tank 2 opens. As a result, the flush water stored in the flush water tank 2 flows into the integrated component 8b of the rim water channel 8 through the rim drain port (not shown) and the rim water inlet 8a (Figure 3). Here, the integrated component 8b of the rim water channel 8 is provided with a water reservoir 13d, and since flush water is retained in this water reservoir 13d, the air layer inside the rim water channel 8 is kept relatively small.

[0062] Therefore, once cleaning water begins to flow into the rim water inlet 8a, the integrated component 8b of the rim water channel 8 becomes full relatively quickly. As a result, the cleaning water discharged from the cleaning water tank 2 is less likely to be wasted in filling the space within the rim water channel 8, and the energy based on the water head of the cleaning water in the cleaning water tank 2 can be effectively utilized to forcefully discharge the cleaning water from the rim water outlet 4a. In addition, since the water reservoir 13d of the rim water channel 8 is configured to be deep, a large flow path cross-sectional area is secured in the integrated component 8b of the rim water channel 8, and energy loss of cleaning water due to flow resistance can be suppressed.

[0063] The cleaning water that flows from the cleaning water tank 2 into the integrated component 8b of the rim water conduit 8 passes through the composite component 8c located downstream thereof and is discharged from the rim outlet 4a. The cleaning water discharged from the rim outlet 4a flows onto the shelf surface 4c of the bowl section 4, which is formed to be connected to the floor surface of the rim outlet 4a, and flows in a swirling manner within the bowl section 4, guided by the shelf surface 4c. That is, the cleaning water that flows onto the shelf surface 4c flows slowly downward towards the center of the bowl section 4, swirling on the shelf surface 4c and the surface of the bowl section 4, thereby cleaning the bowl section 4.

[0064] On the other hand, after the user operates the control unit (not shown) and the rim drain valve 2a is opened, the jet drain valve 2b (Figure 2) in the cleaning water tank 2 is opened after a predetermined time has elapsed. As a result, the cleaning water in the cleaning water tank 2 flows into the jet water channel 10 (Figure 2) and is discharged from the jet outlet 4b located at the bottom of the bowl section 4.

[0065] When cleaning water is discharged from the jet outlet 4b, the waste and cleaning water in the bowl section 4 flow over the top 6a of the drain trap pipe 6 and into the drain socket (not shown) from the downstream end 6b of the drain trap pipe 6. When the area around the drain socket is filled with the incoming cleaning water, a siphon effect is induced. As a result, the waste and cleaning water in the bowl section 4 are drawn into the drain trap pipe 6 and discharged through the drain trap pipe 6 and drain socket into the drain piping (not shown).

[0066] In the flush toilet 1 embodiment of the present invention, the rim water channel 8 that guides the flush water stored in the flush water tank 2 to the rim outlet 4a is composed of an integrated component 8b made from a single part and a composite component 8c made from multiple parts downstream of the integrated component 8b. This allows for a reduction in the bonding surface required to form the rim water channel 8, thereby improving the yield when manufacturing the flush toilet 1. Furthermore, since the upstream side of the rim water channel 8 is an integrated component 8b made from a single part, it becomes possible to omit support walls and the like to support the integrated component 8b, thereby increasing design flexibility.

[0067] Furthermore, in the flush toilet 1 of this embodiment, the joint surfaces of the integrated component 8b and the composite component 8c (the lower end surface 13c of the vertical wall 13b and the stepped portion 16b) are located lower than the bottom surface 13a of the downstream end of the integrated component 8b. As a result, a drop is created between the bottom surface 13a of the downstream end of the integrated component 8b and the bottom surface of the composite component 8c. This imparts kinetic energy to the flushing water as it falls down the drop, increasing the flow velocity of the flushing water discharged from the rim outlet 4a.

[0068] Furthermore, according to the flush toilet 1 of this embodiment, since the bottom surface of the rim outlet 4a is lower than the bottom surface 13a of the downstream end of the integrated component 8b, even if there is a step between the integrated component 8b and the composite component 8c, the flushing water in the composite component 8c can be discharged from the rim outlet 4a, preventing flushing water from remaining in the composite component 8c.

[0069] Furthermore, according to the flush toilet 1 of this embodiment, the flow path cross-sectional area of ​​the rim outlet 4a is configured to be smaller than the flow path cross-sectional area at the downstream end of the integrated component 8b, so the flow path cross-sectional area can be narrowed within the composite component 8c of the rim water channel 8, and the flow velocity of the flushing water discharged from the rim outlet 4a can be increased.

[0070] Furthermore, according to the flush toilet 1 of this embodiment, since the downstream end of the integrated component 8b is located behind the center point C in the front-rear direction of the rim water channel 8, the rim water channel 8 can be formed smoothly by the integrated component 8b and the composite component 8c.

[0071] Furthermore, in the flush toilet 1 of this embodiment, the downstream end of the integrated component 8b is located in front of the rear end of the skirt portion 14c, so the composite component 8c connected to the front of the integrated component 8b is provided in front of the rear end of the skirt portion 14c. For this reason, even if a support wall or the like is provided to support the composite component 8c of the rim water channel 8, the support wall or the like is covered by the skirt portion 14c, and a good appearance can be maintained.

[0072] Furthermore, the flush toilet 1 of this embodiment is provided with a rim water channel 8 and a jet water channel 10 located closer to the center in the width direction than the rim water channel 8. When two water channels are provided side by side in the width direction of the flush toilet 1 in this way, the mold for forming them tends to become complicated. However, by constructing the jet water channel 10 from multiple parts and the rim water channel 8 from an integrated component 8b and a composite component 8c, it is possible to simplify the structure of the mold and make molding easier.

[0073] Although embodiments of the present invention have been described above, various modifications can be made to the embodiments described above. In particular, in the embodiments described above, the flush toilet was equipped with a jet nozzle, but the present invention can also be applied to flush toilets that are not equipped with a jet nozzle. Furthermore, in the embodiments described above, the composite component of the rim water channel was composed of two parts, but the composite component can be composed of any three or more parts. [Explanation of Symbols]

[0074] 1 flush toilet 1a Rim section 1b Torso 2. Washing water tank 2a Drain valve for rim 2b Drain valve for jet 4 Bowl section 4a Rim outlet 4b Jet nozzle 4c shelf surface 6. Drain trap pipe 6a Top 6b Downstream end 8 Rim waterway 8a Rim water inlet 8b Integral component 8c Composite component 10. Jet water conduit 12a Bowl opening 12b Drain outlet for jet 12c jet recess 12d Outer adhesive surface 12e Bowl bonding surface 13 Recess for rim 13a Bottom surface of the downstream end 13b Vertical wall 13c Lower end surface (joint surface) 13d Water reservoir 14a Recess for jet 14b Supporting wall 14c Skirt section 14d Outer adhesive surface 14e Bowl bonding surface 16 Recess for rim 16a Ridge 16b Step part (joint surface)

Claims

1. A flush toilet that performs flushing using flushing water stored in a flushing water tank, The bowl part, A drain trap pipe is connected to the bottom of this bowl section, A rim water channel guides the cleaning water stored in the cleaning water tank to the rim outlet formed on the upper edge of the bowl section, It has, The above-mentioned rim water channel is composed of a single component and is characterized by comprising an integrated component into which flushing water flows from the flushing water tank, and a composite component made up of multiple components that extends from the downstream end of the integrated component to the rim water outlet.

2. The flush toilet according to claim 1, wherein the joint surface between the integrated component and the composite component is located lower than the bottom surface of the downstream end of the integrated component.

3. The flush toilet according to claim 1, wherein the bottom surface of the rim outlet is lower than the bottom surface of the downstream end of the integrated component.

4. The flush toilet according to claim 1, wherein the cross-sectional area of ​​the flow path of the rim outlet is configured to be smaller than the cross-sectional area of ​​the flow path at the downstream end of the integrated component.

5. The flush toilet according to claim 1, wherein the rim water channel extends in the front-rear direction of the flush toilet from the flush water tank located behind the bowl portion to the rim water outlet, and the downstream end of the integrated component is located behind the center point of the rim water channel in the front-rear direction.

6. Furthermore, the flush toilet according to claim 1, which has a skirt portion that covers the periphery of the bowl portion, and the downstream end of the integrated component is located in front of the rear end of the skirt portion.

7. Furthermore, the flush toilet according to claim 1 has a jet water channel that guides flushing water to the jet outlet, the jet water channel is provided closer to the center in the width direction of the flush toilet than the rim water channel, and is composed of a plurality of parts.

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