Water-washable toilet

Abstract

To certainly and early cause siphonage to occur.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, serves as a channel for washing water discharged from the drain trap part, and has an upper drain socket extending downward from the drain trap part and a rear R part that is connected the upper drain socket so as to change a channel so that the washing water from above flows forward and a rear R part extending forward from the rear R part. The rear R part and the rear R part have a water reservoir part to store a portion of the washing water. The water reservoir part is disposed below a rear lower end of the drain trap 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] Here, the swing-back drain socket has the advantage of easily generating a siphoning effect because the portion of the flow path where the flush water flowing from above is bent so that it flows forward is filled with flush water. On the other hand, the swing-back drain socket makes little contribution to starting the siphoning effect because flush water discharged from near the rear lower end of the outlet of the drain trap section connected to the upstream side of the swing-back drain socket flows downstream quickly, which may result in the siphoning effect not occurring or the timing of the siphoning effect being delayed. As such, the prior art left room for improvement in terms of ensuring that the siphoning effect occurs quickly.

[0005] An object of one aspect of the embodiment is to provide a flush toilet that can reliably and quickly generate a siphon action. [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 flushing water into the bowl portion, a drain trap portion connected to the bottom of the bowl portion and discharging waste within the bowl portion, and a drain socket connected on its upstream side to the drain trap portion and connected on its downstream side to a drain outlet on the floor surface, which serves as a flow path for flushing water discharged from the drain trap portion, the drain socket having an upper drain socket extending downward from the drain trap portion, a rear R portion connected to the upper drain socket and which changes the flow path so that flushing water flowing from above flows forward, and a horizontal pull-out pipe extending forward from the rear R portion, the rear R portion and the horizontal pull-out pipe having a water reservoir portion for storing some of the flushing water, the water reservoir portion being located below the rear lower end of the drain trap portion.

[0007] With this configuration, some of the flush water discharged from the drain trap section flows directly into the water reservoir without hitting the inner wall of the drain socket, so the flush water that has accumulated in the water reservoir can be used early on to create a full water flow path near the rear end of the water reservoir in the drain socket.This allows the siphon action to occur reliably and early on, and can also occur reliably and early on in situations such as low-volume flushes and tornado flushes using rim water discharge, which are popular in water-saving applications in recent years.

[0008] Furthermore, in the flush toilet described above, the upper drain socket has an inclined portion that slopes downward toward the rear from upstream to downstream, and the rear end of the water reservoir is located near an extension line from the lower end of the inclined portion.

[0009] With this configuration, flush water that is discharged from near the rear lower end of the drain trap and flows directly into the water reservoir, as well as flush water that is discharged from near the front lower end of the drain trap, hits the sloped portion, flows along the front side (slope) of the sloped portion, and then flows downward, flows into the water reservoir early on. This makes it possible to use the flush water that has accumulated in the water reservoir to fill the flow path near the rear end of the water reservoir in the drain socket, allowing the siphon action to occur even earlier.

[0010] Furthermore, in the flush toilet described above, the upper drain socket has an inclined portion that slopes downward toward the rear from upstream to downstream, and when viewed from the side, an extension line extending downward from the rear lower end of the drain trap portion and an extension line extending downward from the lower end of the inclined portion along the slope of the inclined portion intersect above the water reservoir portion.

[0011] With this configuration, flush water discharged from near the rear lower end of the drain trap section and flush water discharged from near the front lower end of the drain trap section, hitting the sloped section and flowing along the front side (slope) of the sloped section, and then shooting out diagonally rearward from the lower end of the sloped section while maintaining its water force, meet above the water reservoir. As a result, flush water that has accumulated in the water reservoir (reserved water) can be used early on, while creating a pool of flush water near the rear end of the water reservoir, quickly creating a full water state for the flow path inside the drain socket. This ensures that siphon action occurs reliably and quickly, even in situations such as low-volume flushes and tornado flushes using the rim spout that are popular in recent water-saving applications.

[0012] Furthermore, in the flush toilet described above, the upper drain socket has an inclined portion that slopes downward toward the rear from upstream to downstream, and when viewed from the side, the intersection of an extension line extending downward from the rear lower end of the drain trap portion and an extension line extending downward from the lower end of the inclined portion along the slope of the inclined portion is positioned below the upper end of the horizontal pull-out pipe.

[0013] With this configuration, the flush water (reserved water) accumulated in the water reservoir can be used to quickly fill the flow path in the drain socket, so the siphon activation position (the part of the flush water flow path that is narrow and creates resistance, for example) for generating the siphon action can be set at a low position.This increases the drop from the water surface in the bowl, making it possible to generate large potential energy when the siphon action is activated. [Effects of the Invention]

[0014] According to one aspect of the embodiment, the siphoning action can be generated reliably and quickly. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a side cross-sectional view showing a flush toilet according to an embodiment. [Figure 2] Figure 2 is an enlarged cross-sectional view (part 1) of the drain socket. [Figure 3] Figure 3 is an enlarged cross-sectional view (part 2) of the drain socket. [Figure 4] FIG. 4 is an explanatory diagram of the siphon activation position. DETAILED DESCRIPTION OF THE INVENTION

[0016] 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.

[0017] (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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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, Tfunctions as a water seal, preventing odors and the like from flowing back into the bowl portion 2 from the drainage pipe 61 described later.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] <Drainage socket configuration (part 1)> 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] <Drainage socket configuration (part 2)> Next, the drain socket 5 will be described in more detail with reference to Figures 3 and 4. Figure 3 is an enlarged cross-sectional view of the drain socket 5. As shown in Figure 3, the drain socket 5 includes an upper drain socket (vertical pipe) 51 through which flush water discharged from the descending pipe 43 of the drain trap section 4 flows downward, and a rear R section 52 that is connected to this vertical pipe 51 and through which flush water flowing from above turns and flows forward.

[0042] As shown in Figure 3, the vertical pipe 51 forms a flow path for flush water to flow downward. The rear curved portion 52 forms a flow path for flush water to flow from rear to front. The horizontal pipe 53 forms a flow path for flush water to flow from rear to front.

[0043] Water pool 55 has an inclined surface 551 on the bottom surface on the downstream side that slopes upward toward front end 553. 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 55 gradually increases toward front end 553.

[0044] In this way, the angle of inclination of the water pool section 55 gradually increases toward the front end section 553, so that even when large pieces of waste flow downstream from the water pool section 55, stagnation of the waste due to a sudden change in the angle of inclination is suppressed.

[0045] In addition, in the water pooling portion 55, the front end portion 553 and the rear end portion 554 are defined by the front and rear ends of the stored water Wa, and are also portions that can change depending on the amount of stored water Wa.

[0046] Furthermore, the water reservoir 55 is disposed on the upstream side below the rear lower end 432 of the drain trap section 4 (downcoming pipe line 43). In this way, by disposing the water reservoir 55 below the rear lower end 432 of the drain trap section 4 (downcoming pipe line 43), a portion of the flush water discharged from the drain trap section 4 flows directly into the water reservoir 55 without colliding with the inner wall of the drain socket 5 (specifically, the inner wall of the vertical pipe 51 or the rear R section 52), and therefore the flush water (reserved water W a In this way, flush water can be used without loss to create a full water state in the flow path near the rear end 554 of the water reservoir 55 in the drain socket 5, which accelerates the timing of starting the siphon action.

[0047] The vertical pipe 51 has an inclined portion 514 that slopes downward from the upstream to the downstream. The water reservoir 55 is formed along an extension line L from a lower end 514a of the inclined portion 514. E1 In this way, the water reservoir 55 is disposed on the extension line L from the lower end 514a of the inclined portion 514. E1 By being placed above, flush water W1 that is discharged from near the front lower end 431 of the drain trap section (downcoming pipe 43) together with flush water W2 that is discharged from near the rear lower end 432 of the drain trap section 4 (downcoming pipe 43), collides with the inclined section 514, flows along the front side (inclined surface) of the inclined section 514, and then flows down, also flows into the water pool section 55 early. a ) can be used early to create a full water state in the flow path near the rear end 554 of the water reservoir 55 in the drain socket 5, thereby hastening the start of the siphon action.

[0048] Further, above the water reservoir portion 55, in a side view, an extension line L extending downward from the rear lower end portion of the drain trap portion (downward pipe 43) is formed. E2 and an extension line L extending downward from the lower end 514a of the inclined portion 514 along the inclination of the front side surface (inclined surface) of the inclined portion 514. E1 Intersection point P I will be placed.

[0049] In this way, two extension lines L E1 ,extension line L E2 Intersection point P I By arranging the drain trap section 4 (downcoming pipe line 43), flush water W1 discharged from near the rear lower end 432 of the drain trap section 4 (downcoming pipe line 43) and flush water W1 discharged from near the front lower end 431 of the drain trap section 4 (downcoming pipe line 43), colliding with the inclined section 514, flowing along the front side surface (inclined surface), and splashing out diagonally rearward from the lower end 514a of the inclined section 514 while maintaining the water force, intersect above the water pool section 55. a ) can be utilized from an early stage, and flush water W1, W2 can be accumulated near rear end 554 of water reservoir 55, so that the flow path in drain socket 5 can be quickly filled with water.

[0050] Here, the siphon activation position will be explained with reference to Figure 4. Figure 4 is an explanatory diagram of the siphon activation position. Note that Figure 4 shows a partial cross section of the flush toilet 1 (see Figure 1) including the drain socket 5. As shown in Figure 4, below the upper end 53d of the horizontal pipe 53, two extension lines L E1 ,L E2 Intersection point P I will be placed.

[0051] In this way, two extension lines L are formed below the upper end 53d of the horizontal pipe 53. E1 ,L E2 Intersection point P I is placed, and the intersection point P I At the intersection P ISince the amount of water increases, the flow path can be quickly filled with water in the drain socket 5.

[0052] In addition, the siphon action is activated when any part of the flow path of the drain socket 5 is filled with flush water, but two extension lines L E1 ,L E2 Intersection point P I By arranging the drain socket 5, the siphon activation position (the position where the drain socket 5 is first filled up) can be set to a position close to the floor F. T The head H from the top surface (water surface) of the pump increases, and when the siphon action occurs, a large amount of potential energy can be generated. In this way, the increase in potential energy strengthens the pulling force caused by the siphon action.

[0053] In addition, the accumulated water W of the waste receiving surface 21 T The head H from the upper surface (reserved water surface) of the waste receiving surface 21 is increased, so that, 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 pulling force due to the siphon action will be maintained.

[0054] As explained above, according to the above-described embodiment, some of the flush water discharged from the drain trap section 4 (downcoming pipe 43) flows directly into the water pool section 55 without colliding with the inner wall of the drain socket 5, and therefore the flush water that has collected in the water pool section 55 can be used early on to create a full water state in the flow path near the rear end 554 of the water pool section 55 inside the drain socket 5. This allows the siphon action to occur reliably and early on, and also allows the siphon action to occur reliably and early on even in situations such as low-volume flushes and tornado flushes using rim water discharge that are popular in recent water-saving applications.

[0055] In addition, together with flush water W2 that is discharged from near the rear lower end 432 of the drain trap section 4 (downcoming pipe 43) and flows directly into the water pool section 55, flush water W1 that is discharged from near the front lower end 431 of the drain trap section 4 (downcoming pipe 43), collides with the inclined section 514, flows along the front side (inclined surface) of the inclined section 514, and then flows down also flows into the water pool section 55 early. a ) can be used to create a full water state in the flow path near the rear end 554 of the water reservoir 55 in the drain socket 5.

[0056] Furthermore, flush water W2 discharged from near the rear lower end 432 of the drain trap section 4 (downcoming pipe 43) and flush water W1 discharged from near the front lower end 431 of the drain trap section 4 (downcoming pipe 43), colliding with the inclined section 514 and flowing along the front side (inclined surface) of the inclined section 514, and then flying out diagonally rearward from the lower end 514a of the inclined section 514 while maintaining its water force, intersect above the water pooling section 55. a ) from an early stage, flush water W1, W2 can be accumulated near the rear end 554 of the water pool 55, and the flow path can be quickly filled with water within the drain socket 5. This allows the siphon action to occur reliably and early, for example, even in situations such as low-volume flushes that are popular in recent years for water conservation, or tornado flushes using rim water discharge.

[0057] In addition, the cleaning water (reserved water W a ) can be used to quickly create a full water state in the flow path in the drain socket 5, so the siphon activation position can be set to a low position. T The head H from the upper surface (reserved water surface) of the waste receiving surface 21 becomes large, and when the siphon action occurs, it is possible to generate a large potential energy. T When the range of water accumulation W is expanded T Even if the height of the upper surface (reservoir surface) of the pump is low, the siphon action can be reliably generated.

[0058] In the above embodiment, the rear end 554 of the water reservoir 55 is aligned with the extension line L E1 By arranging the drain trap section 4 (downward pipe 43) in the vicinity of the upper (slightly forward) position, flush water W1 discharged from the vicinity of the front lower end 431 of the drain trap section 4 (downward pipe 43) is used to quickly start the siphon action. For example, the rear end 554 of the water reservoir section 55 is located on the extension line L E1 This allows for more efficient use of the wash water W1 due to early activation of the siphon action.

[0059] 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]

[0060] 1 flush toilet 2 Bowl section 3. Water outlet 4 Drain trap section 5 drain socket 21 Waste receiving surface 22 Rim 53d Upper end 51 Upper drain socket (vertical pipe) 52 Rear R section 54 Front R section 55 Water reservoir 56 Constriction section 62 Drain port 431 Lower front end 432 Lower rear end 514 Slope 514a Lower end 551 Slope 552 recess 553 Front end 554 Rear end F Floor L E1 extension line L E2 extension line W1 Cleaning water W2 cleaning water P I intersection W a Stored water W T standing water

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 serves as a flow path for flush water discharged from the drain trap section, the drain socket having an upper drain socket extending downward from the drain trap section, a rear R section connected to the upper drain socket and changing the flow path so that flush water flowing from above flows forward, and a horizontal pipe extending forward from the rear R section; Equipped with The rear R portion and the horizontal pipe are A water reservoir for storing a portion of the cleaning water is provided. The water reservoir portion is The drain trap portion is disposed below a rear lower end portion of a lower end portion of a descending pipe, which is a pipe connected to the drain socket in the drain trap portion, the rear end portion being a rear end side in the front-to-rear direction of the descending pipe, The upper drain socket is It has an inclined portion that slopes downward toward the rear from upstream to downstream, In a side view, an intersection of an extension line extending downward from the rear lower end of the drain trap portion and an extension line extending downward from the lower end of the inclined portion along the inclination of the inclined portion is located below an upper end of the horizontal pipe and above the lower end of the horizontal pipe. A flush toilet characterized by:

2. The upper drain socket is It has an inclined portion that slopes downward toward the rear from upstream to downstream, The water reservoir portion is The rear end is located near an extension line from the lower end of the inclined portion.

2. The flush toilet according to claim 1.

3. The upper drain socket is It has an inclined portion that slopes downward toward the rear from upstream to downstream, In a side view, an extension line extending downward from the rear lower end of the drain trap portion and an extension line extending downward from the lower end of the inclined portion along the inclination of the inclined portion intersect above the water reservoir portion.

3. The flush toilet according to claim 1 or 2.

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