Water-washable toilet

Abstract

To certainly cause siphonage to occur while suppressing dirt clogging.SOLUTION: A water closet according to an embodiment has a bowl part, a water discharge part, a drain trap part, and a drain socket. The bowl part has a dirt receiving surface and a rim part. The water discharge part discharges washing water into the bowl part. The drain trap part is connected to a bottom of the bowl part and discharges the dirt in the bowl part. The drain socket is connected to the drain trap part on an upstream side and an exhaust port on a floor surface on a downstream side and has a rear R part to change a channel so that the washing water from above flows forward, a front R part that is disposed downstream of the rear R part and changes the channel so that the washing water from backward flows downward, and a water reservoir part to store a portion of the washing water at the channel from the rear R part to the front R part. The drain socket has a narrow part having the minimum cross-sectional area at the rear R part at an area excluding the uppermost stream end and the lowermost stream end of the rear R part.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] SUMMARY OF THE INVENTION The disclosed embodiments relate to a flush toilet. [Background technology]

[0002] Conventionally, flush toilets are equipped with a drain socket that connects a drain trap, which discharges waste from the bowl, to a drain outlet on the floor. There are several types of drain sockets depending on the shape of the piping, and one known example is a so-called rear-swing drain socket, in which the upstream side is connected to the drain trap, and the downstream side is swung (extended) to the rear of the toilet bowl before extending toward the front and connecting to the drain outlet (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Patent No. 8,011,029 Summary of the Invention [Problem to be solved by the invention]

[0004] However, a swing-back drain socket has the advantage that the siphoning action is more likely to occur because the part of the flow path where the flush water flowing from above is bent so that it flows backward is filled with flush water. On the other hand, because the flow path of a swing-back drain socket is complicated, even if the siphoning action occurs, the water force is weak and it is more likely to become clogged with waste. As such, the conventional technology has room for improvement in terms of achieving both a reliable siphoning action and preventing waste from clogging.

[0005] An object of one aspect of the embodiment is to provide a flush toilet that can reliably generate siphon action while suppressing clogging with waste. [Means for solving the problem]

[0006] A flush toilet according to one aspect of the embodiment comprises a bowl portion having a bowl-shaped waste receiving surface and a rim portion formed above the waste receiving surface, a water discharge portion provided on the rim portion and discharging flush water into the bowl portion, a drain trap portion connected to the bottom of the bowl portion and discharging waste within the bowl portion, a drain socket connected on its upstream side to the drain trap portion and connected on its downstream side to a drain outlet in the floor surface and serving as a flow path for flush water discharged from the drain trap portion, the drain socket having a rear R portion that changes the flow path so that flush water flowing from above is directed forward, a front R portion that is provided downstream of the rear R portion and changes the flow path so that flush water flowing from the rear is directed downward, and a water reservoir portion that stores some of the flush water in the flow path from the rear R portion to the front R portion, the drain socket having a narrow portion in which the cross-sectional area of ​​the rear R portion is smallest in the area excluding the most upstream and most downstream ends of the rear R portion.

[0007] With this configuration, at a predetermined position downstream of the narrow portion and upstream of the flow path (horizontal pipe) through which flush water flows forward, waste that has passed through the narrow portion is able to flow easily without clogging at the predetermined position where the flow path diameter is larger than the narrow portion. This reduces clogging by waste. Meanwhile, since this predetermined position is located in a water reservoir where flush water has accumulated, filling the predetermined position with water is achieved by filling the water reservoir from the top surface (the surface of the stored water) to the top of the flow path. Therefore, the area filled with water at the predetermined position is smaller than the area filled with water in the narrow portion. This ensures that the siphon action occurs reliably. In other words, with this configuration, the siphon action can be reliably generated while preventing clogging by waste.

[0008] Furthermore, in the flush toilet described above, the flow path diameter of the rear R-portion decreases from the most upstream end to the narrow portion, and the narrow portion is located in the basin.

[0009] This configuration allows the siphon activation position to be set close to the floor, i.e., at a low position, and increases the height of the waste receiving surface from the water surface, thereby increasing potential energy. This strengthens the drawing force of the siphon action and prevents poor drainage, such as waste and flush water remaining in the flow path instead of flowing away completely.

[0010] Furthermore, in the flush toilet described above, the basin has an inclined surface that slopes upward toward the front R portion, and the inclined surface forms a recess that is recessed downward.

[0011] With this configuration, the angle of inclination from the water pool to the front curved section gradually increases due to the inclined surface, so even if large pieces of waste flow from the water pool to the front curved section, the waste can be prevented from stagnating due to a sudden change in the angle of inclination. This prevents poor drainage, such as waste remaining in the flow path instead of flowing completely.

[0012] Furthermore, the flush toilet described above is provided with a horizontal pipe connected to the rear R portion, and the horizontal pipe is rounded at least on the edge exposed in the flush water flow path.

[0013] With this configuration, the exposed edge of the horizontal pipe is rounded, which prevents waste from getting caught on the edge of the horizontal pipe and reduces clogging.

[0014] Furthermore, the flush toilet described above is equipped with a horizontal pull-out pipe connected to the rear R portion, and in the vicinity of the connection between the rear R portion and the horizontal pull-out pipe, at least one of the rear R portion and the horizontal pull-out pipe has a plurality of recesses arranged at predetermined intervals along the circumferential direction of the flow path.

[0015] With this configuration, the flush water that bounces off the recesses formed in at least one of the rear curved section and the horizontal pipe creates turbulence, allowing the flow path to fill up quickly. This allows the siphon action to be activated earlier, preventing poor drainage, such as waste and flush water remaining in the flow path.

[0016] Furthermore, in the flush toilet described above, the multiple recesses are formed at positions excluding the center of the rear curved portion and the horizontal pipe in the flow path direction.

[0017] With this configuration, the multiple recesses can accelerate the timing of siphon action activation, while preventing the recesses from clogging with dirt at the center position in the flow path direction, where dirt flowing from the upstream side is likely to fall. [Effects of the Invention]

[0018] According to one aspect of the embodiment, the siphon action can be reliably generated while preventing clogging with waste. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a side cross-sectional view showing a flush toilet according to an embodiment. [Figure 2] FIG. 2 is an enlarged cross-sectional view of the drain socket. [Figure 3] FIG. 3 is an explanatory diagram (part 1) of the change in cross-sectional area in the rear R portion. [Figure 4] FIG. 4 is an explanatory diagram (part 2) of the change in cross-sectional area in the rear R portion. [Figure 5] FIG. 5 is an explanatory diagram of the siphon activation position. [Figure 6] FIG. 6 is an enlarged cross-sectional view of the water reservoir. [Figure 7] FIG. 7 is a perspective view showing the connection between the rear R portion and the horizontal pipe. DETAILED DESCRIPTION OF THE INVENTION

[0020] Embodiments of the flush toilet disclosed in this application will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below.

[0021] (Embodiment) <Overall configuration of a flush toilet> First, the overall structure of a flush toilet 1 according to an embodiment will be explained with reference to Figure 1. Figure 1 is a side cross-sectional view showing a flush toilet 1 according to an embodiment. Note that, to make the explanation easier to understand, Figure 1 illustrates a three-dimensional Cartesian coordinate system including a Z-axis with the positive direction being the upward vertical direction. This Cartesian coordinate system may also be illustrated in other figures.

[0022] In the following description, the positive X-axis direction in the Cartesian coordinate system may be referred to as "rightward," the negative X-axis direction as "leftward," the positive Y-axis direction as "forward," the negative Y-axis direction as "backward," the positive Z-axis direction as "upward," and the negative Z-axis direction as "downward." Note that all of the figures shown in Figure 1 and Figure 2 onwards are schematic diagrams.

[0023] As shown in Figure 1, flush toilet 1 comprises a bowl section 2, a spout section 3, a drain trap section 4, and a drain socket 5. Furthermore, flush toilet 1 is a floor-standing flush toilet. The toilet body including bowl section 2 etc. is made of ceramic, for example, but is not limited to this and could be made of resin, for example, or a combination of ceramic and resin.

[0024] Bowl portion 2 includes waste receiving surface 21 and rim portion 22. Waste receiving surface 21 is formed in a bowl shape capable of receiving waste. Rim portion 22 is formed above waste receiving surface 21 and is formed to form the upper edge of bowl portion 2. Note that in Figure 1, for the sake of simplicity, some components such as the toilet seat provided on top of bowl portion 2 and the cover that covers the toilet seat are not shown.

[0025] The water discharger 3 discharges flush water into the bowl section 2. For example, the water discharger 3 is provided on the rim section 22, and discharges flush water supplied from a water storage tank (not shown) into the bowl section 2 through a water discharge port. Note that in Figure 1, for simplicity of illustration, the water discharger 3 (water discharge port) is shown schematically by a two-dot chain line.

[0026] Flush water discharged from the water discharge section 3 generates a swirling flow, for example, on the waste receiving surface 21 of the bowl section 2, thereby cleaning the bowl section 2. After flushing the toilet, the flush water supplied to the bowl section 2 is stored in the bowl section 2 and the drain trap section 4. In FIG. 1, the flush water stored in the bowl section 2 and the drain trap section 4 is shown by a two-dot chain line, and hereinafter this flush water will be referred to as stored water W T In this way, the drain trap part 4 etc. T By filling it with water, T functions as a water seal, preventing odors and the like from flowing back into the bowl portion 2 from the drainage pipe 61 described later.

[0027] The configuration of the drain trap section 4 will be described. The drain trap section 4 is connected to the bottom 2a of the bowl section 2, and discharges waste together with flush water from within the bowl section 2. More specifically, the drain trap section 4 includes an inlet section 41, an ascending pipe line 42, and a descending pipe line 43.

[0028] The inlet portion 41 is connected to and continues below the waste receiving surface 21 of the bowl portion 2, and allows flush water and waste from the bowl portion 2 to flow into the drain trap portion 4. The rising pipe 42 is connected to the inlet portion 41 and is formed to extend diagonally rearward and upward from the downstream end of the inlet portion 41. The descending pipe 43 is connected to the rising pipe 42 and is formed to extend downward from the downstream end of the rising pipe 42. Furthermore, the drain socket 5 is connected to the downstream end of the descending pipe 43.

[0029] Therefore, in the drain trap section 4, when the toilet is flushed, flush water and waste in the bowl section 2 are discharged into the drain socket 5 through the inlet section 41, the ascending pipe line 42 and the descending pipe line 43.

[0030] <Drainage socket configuration> Next, we will explain the drain socket 5. The drain socket 5 discharges flush water and waste from the drain trap section 4 into the drain pipe 61. For example, the upstream side of the drain socket 5 is connected to the drain trap section 4 (more precisely, the descending pipe 43 of the drain trap section 4) and the downstream side is connected to the drain outlet 62 in the floor surface F, and therefore forms a flow path that discharges flush water and the like from the drain trap section 4 into the drain pipe 61.

[0031] Furthermore, as described above, the drain socket 5 is a so-called rear-swing drain socket, in which the upstream side is connected to the drain trap section 4, and the downstream side is once swung toward the rear of the toilet bowl (negative direction of the Y axis) and then extends toward the front of the toilet bowl (positive direction of the Y axis) to connect to the drain outlet 62.

[0032] Incidentally, in the flush toilet 1 described above, when the toilet is flushed, for example, the drain socket 5 is filled with flush water, causing a siphoning action that expels waste. However, if the drain socket 5 is, for example, a swing-back drain socket, the length of the drain flow path of the drain socket 5 (for example, the length L of the drain flow path in the front-to-back direction (Y-axis direction) shown in Figure 1) tends to be relatively long. As a result, in the flush toilet 1, the siphoning action is unlikely to continue downstream of the drain socket 5, and as a result, discharge performance may decline. Note that the phenomenon of the siphoning action being unlikely to continue downstream of the drain socket 5 described above can occur in other cases as well.

[0033] Therefore, in this embodiment, a configuration is adopted that can improve the waste discharge performance. This configuration will be specifically described below with reference to Figure 2. Figure 2 is an enlarged cross-sectional view of the drain socket 5.

[0034] 1 and 2, the drain socket 5 includes an upper drain socket (vertical pipe) 51, a rear R portion 52, a front drain socket (horizontal pipe) 53, a front R portion 54, a water reservoir portion 55, and a throttle portion 56. The drain socket 5 is made of resin, but is not limited to this.

[0035] The vertical pipe 51 is a pipe that extends vertically (in the Z-axis direction) and allows flush water that has flowed in from above to flow downward. For example, as shown in FIG. 2, the vertical pipe 51 has an upstream end 51a connected to the drain trap section 4 (more precisely, the descending pipe 43 of the drain trap section 4) and a downstream end 51b connected to the rear curved section 52.

[0036] An intermediate portion 51c is formed between the upstream end 51a and the downstream end 51b. This intermediate portion 51c is formed so as to bend rearward (in the negative direction of the Y-axis), which causes the flow path in the vertical pipe 51 to swing rearward. This makes it easier for flush water to fill the area near the bent part of the vertical pipe 51 in the drain socket 5, thereby making it easier to generate a siphon effect.

[0037] The rear curved section 52 is a pipe that is located at the rear of the flush toilet 1 and changes the flow path so that flush water flowing from above is directed forward. For example, the upstream end 52a of the rear curved section 52 is connected to the vertical pipe 51 (more precisely, the downstream end 51b of the vertical pipe 51), and the downstream end 52b is connected to the horizontal pipe 53.

[0038] A curved portion 52c is formed between the upstream end 52a and the downstream end 52b. The curved portion 52c is formed to bend forward, thereby changing the flow path of the cleaning water flowing from above into a flow path going forward.

[0039] The horizontal pipe 53 is a pipe that extends in the front-to-rear direction (Y-axis direction) and directs flush water flowing from the rear to the front. For example, the upstream end 53a of the horizontal pipe 53 is connected to the rear curved portion 52 (more precisely, the downstream end 52b of the rear curved portion 52), and the downstream end 53b is connected to the front curved portion 54.

[0040] An intermediate portion 53c is formed between the upstream end portion 53a and the downstream end portion 53b. The intermediate portion 53c is formed to extend in the front-to-rear direction, and therefore flush water flowing from the rear is directed forward.

[0041] The front curved section 54 is provided downstream of the rear curved section 52, and is a pipe that changes the flow path so that flush water flowing from the rear flows downward. For example, the front curved section 54 has an upstream end 54a connected to the horizontal drawing pipe 53 (more precisely, a downstream end 53b of the horizontal drawing pipe 53), and a downstream end 54b connected to a drain outlet 62 of the drain pipe 61 via a narrowed section 56.

[0042] An ascending portion 54c and a descending portion 54d are formed between the upstream end 54a and the downstream end 54b. The ascending portion 54c is connected to the upstream end 54a and is formed to extend obliquely upward and forward from the upstream end 54a. The descending portion 54d is connected to the ascending portion 54c and is formed to extend downward from the downstream side of the ascending portion 54c. In this way, by forming the ascending portion 54c and the descending portion 54d to be curved, the front curved portion 54 changes the flow path of flush water flowing from the rear into a downward flow path.

[0043] Furthermore, in the drain socket 5, the front curved portion 54 has an ascending portion 54c formed so as to extend obliquely forward and upward, so that a water reservoir 55 is formed in the flow path from the rear curved portion 52 to the front curved portion 54. In FIG. 2, the flush water stored in the water reservoir 55 is indicated by a two-dot chain line, and such flush water will be referred to below as stored water W a It may be written as follows.

[0044] In this way, in the drain socket 5, the stored water W a For example, when flushing the toilet, the stored water W a By using this, the inside of the pipe can be filled with a relatively small amount of flushing water, thereby enabling the siphoning action to occur early.

[0045] In addition, stored water W a In order to fill the inside of the piping with a relatively small amount of flushing water by utilizing the above, a narrowed portion 521 is further provided in the rear curved portion.

[0046] <Configuration of rear R section> Next, referring to FIGS. 3 to 5, the configuration of the rear R portion 52 will be further described. FIGS. 3 and 4 are explanatory diagrams of the change in the cross-sectional area S in the rear R portion 52. In FIG. 3, using the cross-sectional perspective of the rear R portion 52, the aspect of the cross-sectional area S at each position from the upstream to the downstream in the rear R portion 52 is shown. Also, in FIG. 4, the change in the cross-sectional area S in the rear R portion 52 is shown graphically. FIG. 5 is an explanatory diagram of the arrangement of the siphon starting position P S is. In FIG. 5, a side cross-section of the flush toilet 1 including the drain socket 5 is shown.

[0047] As shown in FIG. 3, a narrow portion 521 is provided at a predetermined position of the curved portion 52c, that is, in a region excluding the most upstream end (the upstream end of the upstream side end portion 52a) and the most downstream end (the downstream end of the downstream side end portion 52b) of the rear R portion 52. The narrow portion 521 is a portion where the cross-sectional area S is minimized in the rear R portion 52.

[0048] Note that, as shown in FIG. 3, the cross-sectional area S of the rear R portion 52 is the sum of the air cross-sectional area S A in the flow path of the rear R portion 52 and the water cross-sectional area (the cross-sectional area of the stored water W a stored in the water storage portion 55) S W . In FIG. 3, the cross-sectional areas S of the flow path cross-sections A (the cross-section of the upstream side end portion 52a), A1, A2, B (the cross-section of the narrow portion 521), and C (the cross-section of the downstream side end portion 52b) are shown from the upstream side. The narrow portion 521 where the cross-sectional area S is minimized in the rear R portion 52 is arranged in the water storage portion 55.

[0049] As shown in FIG. 4, the flow path length of the rear R portion 52, that is, the cross-sectional area S of the flow path cross-section gradually decreases from the most upstream end (the upstream side end portion 52a) to the narrow portion 521. Also, the flow path length of the rear R portion 52, that is, the cross-sectional area S of the flow path cross-section gradually increases from the narrow portion 521 to the most downstream end (the downstream side end portion 52b). Thus, the cross-sectional area S has the relationship of A > B, B < C, and the narrow portion 521 has the minimum cross-sectional area S in the rear R portion 52.

[0050] On the other hand, the air cross-sectional area S in the flow path of the rear R portion 52 AThe air cross-sectional area S in the flow path of the rear curved portion 52 gradually decreases from the most upstream end (upstream end portion 52a) and continues to decrease even after passing the narrow portion 521 downstream. A gradually decreases from the most upstream end (upstream end 52a) to the most downstream end (downstream end 52b).

[0051] Furthermore, since the narrow portion 521 is inserted into the water reservoir portion 55, as shown in FIG. 5, it is a portion in the flow path of the cleaning water that is narrow and generates resistance, and the flow path is filled with cleaning water, so that the siphon action occurs at the siphon activation position P S (the position of the narrow portion 521) is set to a position close to the floor surface F. In this case, the accumulated water W T The drop H from the top surface (water surface) of the tank increases, increasing the potential energy and strengthening the pulling force due to the siphon action.

[0052] In addition, the accumulated water W of the waste receiving surface 21 T By ensuring a head H from the upper surface (reserved water surface) of the waste receiving surface 21, for example, the retained water W T When the range of water accumulation W is expanded T Even if the height of the top surface (water surface) of the tank becomes lower, the head H can be sufficiently secured and the potential energy will not decrease, so the drawing force due to the siphon action can be strengthened.

[0053] <Configuration of the water reservoir> Next, the configuration of the water reservoir 55 will be further described with reference to Fig. 6. Fig. 6 is an enlarged cross-sectional view of the water reservoir 55.

[0054] 6, water pool section 55 has, on its downstream bottom surface, an inclined surface 551 that slopes upward toward front curved section 54. Sloped surface 551 forms recess 552, where the bottom surface is recessed downward. Due to inclined surface 551, the angle of inclination of water pool section 55 gradually increases toward front curved section 54.

[0055] In this way, the angle of inclination in the water pooling section 55 gradually increases toward the front R section 54, so that even when large waste flows from the water pooling section 55 into the front R section 54, stagnation of the waste due to a sudden change in the angle of inclination is suppressed.

[0056] <Configuration of front drain socket (horizontal pipe)> Next, the configuration of the front drain socket (horizontal pipe) 53 will be further described with reference to Fig. 7. Fig. 7 shows the connection part P between the rear R portion 52 and the horizontal pipe 53. J FIG.

[0057] As shown in Figure 7, the upstream end of horizontal pipe 53, which is the front drain socket, is connected to rear curved section 52. Horizontal pipe 53 is a cylindrical pipe, and of the edge portion on the side (upstream side) connected to rear curved section 52, at least inner edge portion 531 exposed in the flow path of the cleaning water is rounded. In other words, inner edge portion 531 exposed in the flow path has a smooth corner without any edges.

[0058] In addition, at least one of the rear R portion 52 and the horizontal pipe 53 has a connection portion P between the rear R portion 52 and the horizontal pipe 53. J 7, the plurality of recesses 57 are formed on the rear curved portion 52 side. The plurality of recesses 57 are formed at the center (center line L) of the rear curved portion 52 and the horizontal pipe 53 in the flow path direction D1. D ) is formed in a position other than the

[0059] The recesses 57 are arranged at predetermined intervals along the circumferential direction D2 of the flow path of the rear curved portion 52 or the flow path of the horizontal pipe 53.

[0060] It is preferable that the peripheral edges exposed in the flow path of the plurality of recesses 57 are also rounded, so that the peripheral edges exposed in the flow path of the plurality of recesses 57 have smooth corners without edges.

[0061] As explained above, according to the above-mentioned embodiment, at a predetermined position downstream of the narrow section 521 and upstream of the flow path (horizontal pipe 53) through which the forward-flowing flush water flows, the waste that has passed through the narrow section 521 does not get clogged at the predetermined position where the flow path diameter is larger than that of the narrow section 521, and flows easily. This makes it possible to prevent waste from getting clogged. On the other hand, since this predetermined position is located in the water reservoir section 55 where flush water has accumulated, in order to fill the predetermined position with water, it is necessary to use the upper surface of the water reservoir section 55 (reserved water W a The area from the upper surface of the narrow portion 521 to the upper part of the flow path can be filled with water. Therefore, the area filled with water at the predetermined position is smaller than the area filled with water in the narrow portion 521. This ensures that the siphon action occurs. In other words, the siphon action can be ensured while preventing clogging with waste.

[0062] Also, the siphon start position P S (the narrow portion in the flow path of the flushing water where resistance occurs) can be set near the floor surface F, that is, at a low position, and the accumulated water W T The potential energy can be increased because the difference in height H from the top surface (reservoir surface) of the pump increases. This increases the drawing force due to the siphon effect, and prevents poor drainage, such as waste and cleaning water remaining in the flow path without being completely flushed away.

[0063] Furthermore, because the angle of inclination from water pooling section 55 to front curved section 54 gradually increases due to inclined surface 551, even when large pieces of waste flow from water pooling section 55 to front curved section 54, the waste can be prevented from stagnating due to a sudden change in the angle of inclination. This makes it possible to prevent poor drainage, such as waste not flowing away completely and remaining in the flow path.

[0064] Furthermore, the exposed edge 531 of the horizontal pipe 53 is rounded to prevent waste from getting caught on the edge 531 of the horizontal pipe 53, thereby reducing clogging with waste.

[0065] Furthermore, the flush water that bounces off the recesses 57 formed in at least one of the rear curved portion 52 and the horizontal pipe 53 creates turbulence, allowing the flow path to be filled with water quickly. This allows the siphon action to be activated earlier, preventing poor drainage such as waste and flush water remaining in the flow path without being completely flushed away.

[0066] Furthermore, the plurality of recesses 57 accelerates the timing of starting the siphon action, while also positioning the center of the flow direction D (center line L D ) position, clogging of the recess 57 with dirt can be prevented.

[0067] In the above-described embodiment, among the edge portions on the side (upstream side) connected to the rear R portion 52, at least the inner edge portion 531 exposed in the flow path of the cleaning water is subjected to R processing, but for example, R processing may be applied to all of the edge portions on the upstream side of the horizontal pipe 53.

[0068] In the above-described embodiment, a plurality of recesses 57 are formed in at least one of the rear R portion 52 and the horizontal pipe 53. However, for example, only one recess 57 may be formed in at least one of the rear R portion 52 and the horizontal pipe 53. In this case, too, the recess 57 is formed at the center (center line L) of the rear R portion 52 and the horizontal pipe 53 in the flow path direction D1. D ) is formed in a position other than the

[0069] Further advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. [Explanation of symbols]

[0070] 1 flush toilet 2 Bowl section 3. Water outlet 4 Drain trap section 5 drain socket 21 Waste receiving surface 22 Rim 51 Upper drain socket (vertical pipe) 52 Rear R section 52a Most upstream end (upstream end) 52b Most downstream end (downstream end) 53 Front drain socket (horizontal pipe) 54 Front R section 55 Water reservoir 57 Recess 62 Drain port 521 Narrow part 531 Edge 551 Slope 552 recess F Floor P J Connection P S Siphon activation position D1 Flow direction D2 Circumferential direction W a Stored water W T standing water L length L D center line S cross-sectional area S A Air Cross Section Area S W water cross section

Claims

1. a bowl portion having a bowl-shaped waste receiving surface and a rim portion formed above the waste receiving surface; a water discharge portion provided in the rim portion and discharging flush water into the bowl portion; a drain trap portion connected to the bottom of the bowl portion and configured to discharge waste from the bowl portion; a drain socket whose upstream side is connected to the drain trap section and whose downstream side is connected to a drain outlet on the floor surface, and which serves as a flow path for flush water discharged from the drain trap section, the drain socket having a rear R section that changes the flow path so that flush water flowing from above heads forward, a front R section that is provided downstream of the rear R section and changes the flow path so that flush water flowing from behind heads downward, and a water reservoir section that stores a portion of the flush water in the flow path from the rear R section to the front R section; Equipped with The drain socket is a narrow portion in which the cross-sectional area of ​​the rear R portion is minimum in a region excluding the most upstream end and the most downstream end of the rear R portion; The rear R portion is The flow path diameter becomes smaller from the most upstream end to the narrow portion, The narrow portion is Located in the water reservoir, The water reservoir portion is a recessed portion that is recessed downward by sloping upward toward the front R portion, and has an inclined surface that rises continuously from a flat bottom surface of the recessed portion in a side view and continues toward the front R portion, Horizontal pipe connected to the rear R portion Equipped with The horizontal pipe is At least the edge exposed in the flow path of the cleaning water is rounded. A flush toilet characterized by:

2. Horizontal pipe connected to the rear R portion Equipped with A plurality of recesses are formed in at least one of the rear R portion and the horizontal pipe near a connection portion between the rear R portion and the horizontal pipe, the recesses being arranged at predetermined intervals along the circumferential direction of the flow path.

2. The flush toilet according to claim 1.

3. The plurality of recesses are The rear R portion and the horizontal pipe are formed at positions other than the center in the flow path direction.

3. The flush toilet according to claim 2.

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