JP2015151844A - Water closet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water closet capable of making both compatible in water conservation and washability of a bowl part.SOLUTION: A water closet 1 of the present invention comprises a water supply device 4 for continuously supplying wash water of a constant large flow rate to a toilet bowl body for a predetermined time, a bowl part 8 having a bowl-shaped dirt receiving surface 16 and a rim part 18 positioned on an upper edge and having an inner peripheral surface and a first rim water discharge port 24 for forming a swirling flow by discharging the wash water supplied from the water supply device in a substantially horizontal direction along the inner peripheral surface of the rim part, and the rim part is formed in an overhang shape, and a water communication passage of the wash water is formed by the overhang shape of this inner peripheral surface, and the bowl part is formed so that a cross-sectional area D2 of a cross section surrounded by a straight line L1 of lowering downward in a vertical direction from the innermost peripheral end of the rim part in a front end area of a minimum radius of curvature R in a plan view of the bowl part and an inner peripheral surface of the bowl part positioned outside of this straight line, becomes larger than the cross-sectional area D1 of the first rim water discharge port 24.

Description

  The present invention relates to a flush toilet, and more particularly to a flush toilet in which flush water having a constant large flow rate is continuously supplied to a toilet body for a predetermined time.

  Conventionally, in order to improve the cleanability of the toilet bowl, in the bowl part of the toilet bowl, the rim part is formed with an overhang shape that protrudes upward into the inner space of the bowl part, and the washing water is horizontally directed from the rim spout A flush toilet is known in which water is discharged into the bowl and the washing water swirls around the inner peripheral surface of the rim portion to flow down to the bowl surface of the bowl portion for washing.

  In the flush toilet having such a structure, since the rim portion of the bowl portion is formed in an overhang shape, “water jumping out by centrifugal force” is a problem. This “jumping out of water by centrifugal force” means that the bowl part of the toilet bowl has an oval shape with the smallest radius of curvature on the front side, so that the washing swivels along the inner peripheral surface of the rim part. When water passes through the inner peripheral surface of the rim portion on the front side, it refers to the phenomenon of being influenced by centrifugal force and jumping out of the bowl portion along the inner peripheral surface. In order to suppress such “spouting of water due to centrifugal force”, for example, as described in Patent Document 1, the degree of overhang of the rim portion on the front side of the bowl portion is increased. Are known.

  In addition, in a flush toilet with an overhanged rim, a jet pump mechanism (for example, patents) that can continuously supply strong water to the bowl surface of the toilet in order to meet the demand for water saving recently. Application of (Ref. 2) has been studied to achieve both water saving and ensuring the washability of the bowl.

JP2013-44182A JP 2004-156382 A

  However, for example, when washing water is supplied to the toilet body by the above-described jet pump mechanism or the like, strong water is continuously supplied to the toilet body for a long time, whereby a large flow rate discharged from the rim spout This cleaning water continuously swivels around the inner peripheral surface of the rim portion. Thereby, in the second half of the cleaning, a new problem occurs that the cleaning water overflows out of the toilet body on the front side where the radius of curvature of the bowl portion is small. This phenomenon is different from the phenomenon of “water jumping out by centrifugal force” generated by the centrifugal force of the washing water described above.

The inventors of the present invention have conducted intensive research and found a “water overflow phenomenon” that occurs when strong water is continuously supplied to the toilet body for a long time.
This “water overflow phenomenon” will be described with reference to FIGS. 17 and 18. FIG. 17 is a partially developed front view showing a front end region of the rim portion of the bowl portion as viewed from the inner space of the bowl portion, and FIG. 18 is a partial plan view showing the front end of the rim portion of the bowl portion. .

  As shown in FIGS. 17 and 18, at the front end 100a of the rim portion 100, the inner peripheral surface 102 of the rim portion 100 is formed in an overhang shape, and a water passage is formed from the lower end 102a to the upper end 102b. A large amount of flush water is continuously discharged from. The description will be made by dividing the wash water continuously spouted at every predetermined elapsed time. When the wash water M1 spouted from the rim spout is turned on the front side of the bowl portion, the front side has a small curvature. Due to the bowl shape of the radius, the pressure loss is received and the flow velocity is reduced. The wash water M2 discharged later catches up with the slowed wash water M1, and the wash waters M1 and M2 stay on the front side of the bowl. The accumulated water M1 and M2 continue to increase with the accumulated water M1, M2, M3, and M4 with the passage of time (the second half of the washing), and the volume thereof increases. The stagnant water M1, M2, M3, and M4 with large volumes collide with the swirling washing water M5 with a small volume discharged later, and ride on the stagnant water or push out part of the stagnant water. It overflows upward and outward due to the centrifugal force.

  In particular, if the wash water is discharged from the rim spout only (no jet spout, etc.), the amount of wash water from the rim spout is large, so the “water overflow phenomenon” from the rim to the toilet body is Become prominent. This “water overflow phenomenon” is an important issue that must be solved in order to continuously supply strong water to the bowl of the toilet body to achieve water saving.

Thus, the inventors of the present invention have made an extensive study to solve the “water overflow phenomenon” that they found and completed the flush toilet according to the present invention.
Thus, an object of the present invention is to provide a flush toilet that can achieve both water saving and washability of the bowl portion.

In order to achieve the above-described object, the present invention is a flush toilet that supplies and flushes flush water to a toilet body, and is connected to the toilet body, and a constant large flow of flush water is continued for a predetermined time. A bowl having a bowl-shaped filth receiving surface, a rim having an inner peripheral surface located on the upper edge, and the rinsing water supplied from the water feeder. A rim water spouting portion that forms a swirling flow by discharging water substantially horizontally along the inner peripheral surface of the rim portion from the water discharge port, and the rim portion has its inner peripheral surface exposed to the inner space of the bowl portion, and It is formed in an overhang shape that extends upward toward the inner space, and this overhang shape on the inner peripheral surface forms a water passage for the wash water, and the rim portion has the smallest radius in the region of the radius of curvature in plan view of the bowl portion. A straight line drawn vertically downward from the inner periphery, The bowl portion is formed so that the cross-sectional area of the cross section surrounded by the inner peripheral surface of the bowl portion located outside the straight line is larger than the cross-sectional area of the water discharge port of the rim water discharge portion. Yes.
In the present invention configured as described above, even when a large amount of flush water is continuously supplied to the toilet body for a predetermined time by the water supply device, the region having the smallest radius of curvature in plan view of the bowl portion. , The cross-sectional area surrounded by the straight line that extends downward in the vertical direction from the innermost peripheral edge of the rim part and the inner peripheral surface of the bowl part located outside this straight line is from the cross-sectional area of the water outlet of the rim water spouting part Since the bowl portion is formed so as to be larger, even if the cleaning water discharged from the rim water discharge portion stays in the region of the minimum curvature radius, it can be received by the overhang-shaped water passage in the rim portion. . As a result, according to the present invention, it is possible to reliably prevent water overflow from the rim portion to the outside of the toilet body. Furthermore, it is possible to achieve both water saving and washability of the bowl portion while maintaining the cleanability by the overhang shape at the rim portion.

In the present invention, preferably, the rim portion is formed so that the vicinity of the innermost peripheral end of the inner peripheral surface thereof is substantially horizontal in the region of the minimum curvature radius in plan view of the bowl portion.
In the present invention configured as described above, the rim portion is formed so that the innermost peripheral end portion of the inner peripheral surface thereof is substantially horizontal in the region of the minimum curvature radius in plan view of the bowl portion. Therefore, even if washing water stays in the water passage on the inner peripheral surface of the rim and overflows, the washing water that is about to overflow can be bounced back into the bowl, preventing overflow from occurring outside the toilet body. it can.

In the present invention, the bottom surface of the cross section surrounded by the straight line and the inner peripheral surface of the bowl portion is preferably formed so as to be inclined downward toward the center of the bowl portion.
In the present invention configured as described above, the bottom surface of the cross section surrounded by the straight line and the inner peripheral surface of the bowl portion is formed so as to be inclined downward toward the center of the bowl portion. Even if it stays in the region of the minimum radius of curvature, the staying wash water falls to the bowl part due to its own weight, so that it is possible to prevent the overflow of the water outside the toilet body.

In the present invention, it is preferable that a small radius of curvature is provided on the downstream side of the region of the minimum radius of curvature from the position where the radius of curvature is smaller than the maximum radius of curvature on the upstream side of the region of the minimum radius of curvature in plan view of the bowl portion. In the region up to the position where the radius of curvature becomes the maximum, the cross-section of the section surrounded by the straight line drawn downward from the innermost peripheral edge of the rim part in the vertical direction and the inner peripheral surface of the bowl part located outside the straight line. The bowl portion is formed so that the area is larger than the cross-sectional area of the water discharge port of the rim water discharge portion.
In the present invention configured as described above, even when a large amount of flush water is continuously supplied to the toilet body for a predetermined time by the water supply device, the region having the smallest radius of curvature in plan view of the bowl portion. The innermost peripheral edge of the rim in the region from the position of the smallest curvature radius to the position of the smallest curvature radius downstream from the position of the smallest curvature radius to the position of the smallest curvature radius on the upstream side The bowl part is formed so that the cross-sectional area surrounded by the straight line drawn downward from the vertical direction and the inner peripheral surface of the bowl part located outside the straight line is larger than the cross-sectional area of the water outlet of the rim water spouting part Therefore, even if the wash water discharged from the rim water discharge part stays in the above-mentioned region, it can be received by the overhang-shaped water passage in the rim part, and the occurrence of overflow of water outside the toilet body can be prevented. It can be stopped.

In the present invention, preferably, the bowl portion is formed such that a region of the front end thereof has a minimum radius of curvature in a plan view, and the rim water spouting portion is disposed in a side region of the bowl portion and washed water forward. In the region from the small curvature radius on the downstream side to the position where the maximum curvature radius is reached from the front end of the bowl part, a straight line that is lowered vertically from the innermost peripheral edge of the rim part and outside this straight line The bowl portion is formed so that the cross-sectional area of the cross section surrounded by the inner peripheral surface of the positioned bowl portion is larger than the cross-sectional area of the water discharge port of the rim water discharge portion.
In the present invention configured as described above, in the region from the front end of the bowl part where the flow velocity of the swirling washing water is most decelerated to the position where the maximum curvature radius is reached from the small curvature radius on the downstream side, the straight line and the bowl part Since the bowl portion is formed so that the cross-sectional area of the cross section surrounded by the inner peripheral surface is larger than the cross-sectional area of the rim water spouting port, the above-described region where the cleaning water discharged from the rim water spouting port has a small curvature radius Even if the stagnation occurs, it can be reliably received by the overhang-shaped water passage in the rim portion, and the occurrence of overflow of water outside the toilet body can be prevented.

In the present invention, preferably, the water supply apparatus includes a water storage tank for storing the wash water, and a jet pump unit disposed in a state where at least a part thereof is submerged in the water storage tank.
In the present invention configured as described above, even when a large amount of washing water is supplied to the toilet body continuously for a predetermined time by the jet pump unit, water is discharged from the rim water discharger and has a small radius of curvature. The wash water staying in the region can be received by the overhang-shaped water passage in the rim portion, and the occurrence of water overflow outside the toilet body can be prevented.

In the present invention, preferably, the jet pump unit of the water supply device has one end connected to the inlet of the water conduit of the toilet body, and the other end formed with a suction port, and the suction port is located at a lower portion in the water storage tank. And a jet nozzle that injects cleaning water toward the suction port of the throat pipe to induce a jet pump action.
In the present invention configured as described above, even when a large amount of washing water is supplied to the toilet body continuously for a predetermined time by the jet pump unit, water is discharged from the rim water discharger and has a small radius of curvature. The washing water staying in the region can be received by the overhanging water passage in the rim portion, and the occurrence of water overflow outside the toilet body can be prevented.

  According to the flush toilet of the present invention, both water saving and washability of the bowl part can be achieved.

It is a top view which shows the flush toilet bowl by embodiment of this invention. It is sectional drawing seen along the II-II line of FIG. It is sectional drawing seen along the III-III line of FIG. It is sectional drawing seen along the IV-IV line of FIG. It is sectional drawing seen along the VV line of FIG. It is sectional drawing seen along the VI-VI line of FIG. It is a top view which shows the water supply apparatus of the flush toilet bowl by embodiment of this invention. FIG. 8 is a front view of FIG. 7. It is a schematic front view which shows the water supply apparatus of FIG. It is a diagram which shows the relationship between the instantaneous flow volume of the wash water supplied with the water supply apparatus of FIG. 7, and time. It is a top view which shows the toilet bowl main body of the flush toilet bowl by embodiment of this invention. It is sectional drawing seen along the XII-XII line | wire of FIG. It is sectional drawing seen along the XIII-XIII line | wire of FIG. It is sectional drawing seen along the XIV-XIV line | wire of FIG. It is a partial front view which shows the 1st rim spout of the flush toilet bowl by embodiment of this invention. It is a fragmentary sectional view which shows the area | region of the front end of the bowl part of the flush toilet bowl by embodiment of this invention. It is the partial front expanded view which expand | deployed and showed the area | region of the front end of the rim | limb part of the bowl part seen from the inner side space of the bowl part for demonstrating a water overflow phenomenon. It is a fragmentary top view which shows the front end of the rim | limb part of a bowl part for demonstrating a water overflow phenomenon.

  Next, a flush toilet according to an embodiment of the present invention will be described with reference to the accompanying drawings. First, the basic structure of a flush toilet according to an embodiment of the present invention will be described with reference to FIGS. 1 is a plan view showing a flush toilet according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is taken along line III-III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 1, and FIG. 5 is a cross-sectional view taken along line V-V in FIG. 6 is a sectional view taken along line VI-VI in FIG.

The flush toilet 1 according to the embodiment of the present invention is a floor drainage type flush flush toilet in which a drain trap pipe, which will be described later, is connected to a drain pipe (not shown) installed on the floor.
As shown in FIGS. 1 and 2, the flush toilet 1 includes a toilet body 2 and a water supply device 4 that supplies cleaning water to the toilet body 2. The toilet body 2 is made of earthenware with a glaze layer formed on the surface, a skirt portion 7 is formed in the lower portion, a bowl portion 8 is formed in the front portion of the upper half, and an upstream end is a water supply device in the upper rear portion. 4 is formed, and a drainage pipe 12 for discharging filth is formed in the lower rear part.

  The water supply device 4 described above includes a water storage tank 5 and a jet pump unit 6 described later. Note that. The present invention can also be applied to a direct pressure flush toilet that does not have a water storage tank and is supplied with wash water directly from the water supply, or a flush toilet that is supplied with wash water by a flush valve.

  The bowl portion 8 includes a bowl-shaped filth receiving surface 16, a rim portion 18 located at the upper edge, and a recess 20 formed below the filth receiving surface 16. Here, the inner peripheral surface 22 of the rim portion 18 is exposed to the inner space of the bowl portion 8 and extends upward toward the inner space, specifically, as shown in FIG. It is formed in an overhanging shape.

  A first rim spout 24 for discharging washing water is formed slightly rearward of the central portion on the left side when viewed from the front of the inner peripheral surface 22 of the rim portion 18 of the bowl portion 8. A second rim spout 26 is formed. The first rim water spouting port 24 and the second rim water spouting port 26 are swirled in the same direction (counterclockwise direction in FIG. 1) to form a swirling flow.

Moreover, the common water flow path 10 formed in the rear upper part of the flush toilet 1 mentioned above is branched into the 1st water flow path 28 and the 2nd water flow path 30 toward the toilet front. The first water passage 28 is for supplying cleaning water to the first rim water outlet 24, and the second water passage 30 is for supplying cleaning water to the second rim water outlet 26.
In the flush toilet 1 described above, the first rim spout 24, the first water passage 28, the second rim spout 26, and the second water passage 30 are formed integrally with the ceramic toilet body 2. The flush toilet according to the present embodiment is not limited to this form, and the first rim water outlet, the first water passage, the second rim water outlet, and the second water passage are separated from the toilet body by a distributor or the like. You may make it form.

  Here, as shown in FIGS. 3 to 6, the region from the first rim water spouting port 24 to the second rim water spouting port 26 of the rim portion 18 is a water passage through which the cleaning water flows along the inner peripheral surface 22. As described above, it is formed in a shape that overhangs inward.

Further, the drainage pipe 12 is connected to the bottom surface of the recess 20 and has substantially the same diameter (substantially the same cross-sectional shape) and extends rearward and downward, and drainage connected to the water conduit 32 and extending upward. A trap conduit 34. The water conduit 32 has substantially the same diameter (substantially the same cross-sectional shape) except for the inlet 32a, and the inside of the pipe has the same cross-sectional area. The drain trap pipe 34 is composed of an ascending path 34a and a descending path 34b.
The water conduit 32 is connected to the bottom surface of the recess 20 as a smooth continuous curved surface, so that the cleaning water flowing from the recess 20 into the introduction conduit 32 flows smoothly through the introduction conduit 32.

  Next, the water supply device 4 of the flush toilet 1 according to the embodiment of the present invention will be described with reference to FIGS. 7 is a plan view showing a water supply device for a flush toilet according to an embodiment of the present invention, FIG. 8 is a front view of FIG. 7, and FIG. 9 is a schematic front view showing the water supply device of FIG. 10 is a diagram showing the relationship between the instantaneous flow rate of cleaning water supplied by the water supply apparatus of FIG. 7 and time. In FIG. 9, for convenience, the arrangement of the jet nozzle and the throat pipe is depicted in a different arrangement from that shown in FIGS.

  The water supply device 4 of the flush toilet 1 includes a water storage tank 5, a water supply pipe 36 for supplying cleaning water to the water storage tank 5, a water supply valve device 38 provided in the water supply pipe 36, and this water supply pipe 36 is provided with a jet pump unit 6 provided at the downstream end of 36 for supplying wash water to the toilet body 2 and a manual lever 40 for the user to supply wash water by manual operation.

  At the upstream end of the water supply pipe 36, a water stop cock 41 is provided for stopping the wash water supplied from an external water supply source. The stop cock 41 is kept open during normal use.

  The jet pump unit 6 includes an inverted V-shaped throat pipe 42 and a jet nozzle 44. Specifically, the downstream end of the throat pipe 42 is connected to a drain port 45 communicating with the common water passage 10 of the toilet body 2, and a suction port 42 a is formed at the upstream end thereof, and this suction port 42 a serves as the water storage tank 5. It is located at the bottom inside. Further, the jet nozzle 44 is disposed so as to face the suction port 42 a of the throat pipe 42, and the suction port 42 a and the jet nozzle 44 of the throat pipe 42 are always submerged in the water storage tank 5.

  The jet pump 6 injects high-speed washing water from the jet nozzle 44 toward the suction port 42a of the throat pipe 42. At this time, the space near the suction port 42a in the throat pipe 42 near the jet nozzle 44 becomes negative pressure. By inducing the jet pump action (ejector effect) by this negative pressure, the washing water in the vicinity of the water storage tank 5 is sucked, and the washing water and the washing water ejected from the jet nozzle 44 are combined. It flows through the throat pipe 42 and is supplied to the common water passage 10 of the toilet body 2 via the drainage port 45.

  In addition to the water supply valve device 38 described above, the water supply line 36 is provided with a constant flow valve 46 on the upstream side of the water supply valve device 38 and a vacuum breaker valve 48 on the downstream side. This constant flow valve 46 is for making the washing water supplied to the water supply valve device 38 have a constant flow rate. The vacuum breaker valve 48 sucks air from the outside and from the vacuum breaker valve 48 to the jet nozzle 44. This is to prevent negative pressure in the pipe.

  The water supply valve device 38 is a pilot-type diaphragm valve, and switches between a main valve seat 50, a water stop state where the water is stopped by sitting on the main valve seat 50, and a water supply state where water is supplied away from the main valve seat 50. The main valve body 52 which is a diaphragm valve, and the pressure chamber 54 which moves the main valve body 52 with respect to the main valve seat 50 with the pressure inside are provided. The pressure chamber 54 includes a first hole 56 and a second hole 58 that release the pressure of the pressure chamber 54, and a first pilot that opens and closes the first hole 56 in conjunction with the manual operation of the user in the manual lever 40 described above. There are provided a valve 60, a float 62 that moves up and down with the level of the washing water in the water storage tank 5, and a second pilot valve 64 that opens and closes the second hole 58 by the vertical movement of the float 62.

  Further, the main valve body 52 is provided with a bleed hole (not shown), and when the water is stopped, the primary side flow path A of the water supply pipe line 32 communicates with the inside of the pressure chamber 54 by the bleed hole. It is supposed to be. Here, the opening area of the first hole 56 is larger than the opening area of the second hole 58. The first hole 56 is formed at an upper position than the second hole 58 as shown in FIG.

  The first pilot valve 60 is connected to the manual lever 40 by a drive shaft 65 and opens and closes the first hole 56 by a manual operation of the manual lever 40 by the user. Here, in FIG. 8, the manual lever 40 is largely washed when rotated to the near side (one direction), and small washed when rotated to the far side (the other direction). It has been made.

  The water supply valve device 38 is normally in a water stop state. In the water stop state, both the first hole 56 and the second hole 58 are closed, and the primary flow path A of the water supply pipe line 36 is Since the pressure chamber 54 communicates with the bleed hole, the water pressure in the primary channel A and the pressure chamber 54 is the same water pressure (= primary channel pressure α), and the secondary channel B is open to the atmosphere. Since the area where water pressure acts on the valve body 52 is larger than the area of the primary side flow path A, the main valve body 52 is pressed against the main valve seat 52 and closed.

  In the water supply valve device 38, when the first hole 56 and / or the second hole 58 are opened by the first pilot valve 60 and / or the second pilot valve 64, the washing water flows out from the pressure chamber 54, and the pressure chamber 54 The internal pressure decreases, the main valve body 52 moves away from the main valve seat 50, opens, and enters a water discharge state.

  In the water supply valve device 38, when the first hole 56 and the second hole 58 are closed by the first pilot valve 60 and the second pilot valve 64, the pressure in the pressure chamber 54 becomes the primary side passage pressure again, and the main valve body 52. Moves toward the main valve seat 50 and finally enters a closed state (water stoppage state). At this time, since the cleaning water of the primary side flow path A is gradually injected into the pressure chamber 54 from the bleed hole, the main hole 56 and the second hole 58 are blocked, and the main water is delayed by a predetermined time. The valve body 52 becomes a valve closing state (water stop state).

  Next, as shown in FIG. 9, near the lower end of the throat pipe 42, a switching valve 66 for switching between jet water discharge and tank water storage and a float 68 attached to the switching valve 66 are provided. Since the float 68 moves up and down depending on the water level in the water storage tank 5, the float 68 also descends when the water level becomes low, so that the switching valve 66 blocks the flow path in the throat pipe 42. ing. In a state where the flow path in the throat pipe 42 is blocked, the wash water sprayed from the jet nozzle 44 collides with the switching valve 66 and flows into the water storage tank 5 without flowing through the throat pipe 42, Water is stored in the tank 5. Further, when the predetermined water level is reached and the water storage is completed, the float 68 is also raised, so that the switching valve 66 opens the flow path in the throat pipe 42. In a state where the flow path in the throat pipe 42 is opened, the washing water sprayed from the jet nozzle 44 flows through the throat pipe 42 and is supplied to the toilet body 2.

  Furthermore, a large / small washing switching mechanism 70 is provided in the water storage tank 5 for switching the amount of washing water required for large washing and small washing. The large / small washing switching mechanism 70 divides the interior of the water storage tank 5 into a space surrounding the jet nozzle 44 and the suction port 42a of the throat pipe 42 and another space, and a partition wall 72 opened above the partition wall 72. And an opening / closing valve 76 attached to the partition wall 72 to open and close the opening 74.

  The on / off valve 76 of the large / small cleaning switching mechanism 70 is connected to the drive shaft 65 by a chain 78. When the manual lever 40 is rotated in the other direction by the user for small cleaning, the on / off valve is operated by the chain 78. 76 is pulled up, and the opening / closing valve 76 closes the opening 74.

  Next, a makeup water supply pipe 82 is provided in the water storage tank 5 to supply makeup water to the toilet body 2 after washing the toilet body 2. A lower end 82a of the makeup water supply pipe 82 communicates with a downstream end of the throat pipe 42, and a makeup water supply port 84 is formed at the upper end 82b.

  As shown in FIG. 9, the water level WL in the water storage tank 5 is as follows. The water level WL1 is the lower end position of the opening 74 of the partition wall 72 and indicates the water level when the large cleaning is completed, the water level WL2 is the upper end position of the partition wall 72 and indicates the water level when the small cleaning is completed, and the water level WL3 is The normal water level before or after use of the flush toilet 1 is indicated, and the water level WL4 is supplied immediately after the washing water is supplied into the water storage tank 30 by the water supply valve device 38 after the large washing or the small washing (and the washing is stopped). It is a water level indicating a water stop state before water supply).

  As shown in FIG. 10, the water supply device 4 provided with the jet pump unit 6 can continuously supply a large amount of flush water to the toilet body 2 for a predetermined time. Specifically, for example, the water supply device 4 is configured to supply flush water of 85 L / min to the toilet body 2 continuously for 4 seconds. The instantaneous flow rate by the water supply device 4 is preferably a large flow rate in the range of about 65 L / min to about 85 L / min, and is preferably continuously supplied for about 3 seconds to about 7 seconds.

  Next, the structure of the rim portion 18 of the bowl portion 8 of the flush toilet 1 according to the present embodiment will be described in detail with reference to FIGS. 11 is a plan view showing a toilet body of a flush toilet according to an embodiment of the present invention, FIG. 12 is a sectional view taken along line XII-XII in FIG. 11, and FIG. 13 is XIII- in FIG. FIG. 14 is a sectional view taken along line XIII, FIG. 14 is a sectional view taken along line XIV-XIV in FIG. 11, and FIG. 15 shows a rim spout of a flush toilet according to an embodiment of the present invention. FIG. 16 is a partial front view, and FIG. 16 is a partial cross-sectional view showing a region at the front end of the bowl portion of the flush toilet according to the embodiment of the present invention.

  First, as shown in FIG. 15, the first rim water discharge port 24 has a rectangular cross section, and the area of the water discharge port is an area D1.

  Next, as shown in FIGS. 11, 12, and 16, in the bowl portion 8 of the toilet body 2, the front end 8 a is formed with the minimum curvature radius R <b> 1 in plan view. In the region of the front end 8a of the bowl portion 8, a straight line L1 that is lowered in the vertical direction from the innermost peripheral end of the rim portion 18, and the bottom surface 8b of the bowl portion 8 that is located outside the straight line L1 and the inner periphery of the rim portion 18. The area of the cross section surrounded by the surface 22 is an area D2.

In the rim portion 18 at the front end 8a of the bowl portion 8, as shown in FIGS. 12 and 16, the inner peripheral surface 22 of the rim portion 18 is formed so that the vicinity of the innermost peripheral end is substantially horizontal. . Further, the bottom surface 8b of the bowl portion 8 outside the straight line L1 (the outer peripheral surface of the filth receiving surface 16) is formed so as to be inclined downward toward the center of the bowl portion 8.
In the flush toilet 1 according to the present embodiment, a straight line L1 that is lowered in the vertical direction from the innermost peripheral end of the rim part 18, the bottom surface 8b of the bowl part 8 located outside the straight line L1, and the inner periphery of the rim part 18. A cross section surrounded by the surface 22 (part of the area D2) functions as the flush water flow path 80.

  In the flush toilet 1 according to the embodiment of the present invention, the cross-sectional area D2 (water channel) surrounded by the straight line L1, the bottom surface 8b of the bowl portion 8 located outside the straight line L1, and the inner peripheral surface 22 of the rim portion 18. 80 cross section) is formed to be larger than the cross section D1 of the water discharge port of the first rim water discharge port 24.

  Next, as shown in FIG. 11, the front portion of the bowl portion 8 is formed with the minimum curvature radius R1 at the tip, and the rear side of the curvature radius R1 is a curvature radius R2 (> R1) larger than the curvature radius R1. A further rear side of the curvature radius R2 is formed by the maximum curvature radius R3 (> R2).

  In the flush toilet 1 according to the present embodiment, the maximum radius of curvature R3 from the radius of curvature R2 through the position P2 of the front end 8a of the bowl portion 8 from the position P1 where the radius of curvature R3 of the bowl portion 8 becomes the radius of curvature R2. In a region S1 up to the position P3, the area of the cross section surrounded by the straight line drawn downward downward in the vertical direction from the innermost peripheral edge of the rim part 18 and the inner peripheral surface of the bowl part located outside the straight line (water channel) The bowl portion 8 is formed such that the area of the cross section 80) is larger than the cross-sectional area D1 of the water outlet of the first rim water outlet 24.

  Further, in the flush toilet 1 according to the present embodiment, as a modification, in the region S2 from the position P2 of the front end 8a of the bowl portion 8 to the position P3 where the curvature radius R2 is the maximum curvature radius R31, the rim portion 18 The area of the cross section (area of the cross section of the water passage 80) surrounded by the straight line drawn downward from the innermost peripheral edge in the vertical direction and the inner peripheral surface of the bowl portion located outside the straight line is the first rim spout. The bowl portion 8 is formed so as to be larger than the cross-sectional area D1 of 24 water outlets.

  Next, the effect by the flush toilet 1 by embodiment of this invention mentioned above is demonstrated. First, when the user operates the manual lever 40 of the water supply device 4, the cleaning water supplied from the external water supply source by the water supply valve device 38 reaches the jet nozzle 44, and the cleaning water flows from the jet nozzle 44 to the throat pipe 42. Injected toward the suction port 42a. At this time, since the vicinity of the suction port 42a of the throat pipe 412 has a negative pressure, the wash water stored in the water storage tank 5 is also sucked into the throat pipe 42 and the wash water and water supplied from the outside by the water supply device 4 are stored. Wash water together with the tank 5 flows through the throat pipe 42 and is supplied to the toilet body 1 to start cleaning the bowl portion 8. At this time, as shown in FIG. 10, a constant large flow rate of wash water is supplied from the water supply device 4 to the toilet body 2 continuously for a predetermined time.

  In the toilet body 1, the first rim spout 24 discharges the cleaning water forward in a substantially horizontal direction, and the second rim spout 26 discharges the cleaning water rearward in a substantially horizontal direction, A swirl flow swirling in the same direction (counterclockwise) is formed.

  When the wash water spouted forward from the first rim spout 24 swivels at the front end 8a of the bowl portion 8, it receives a pressure loss due to the minimum curvature radius R1 and the flow velocity is reduced. The wash water discharged later catches up with the slowed wash water, and the wash water stays in the region of the front end 8a of the bowl portion 8. However, in the flush toilet 1 of the present embodiment, the cross-sectional area D2 of the water passage 80 formed by the inner peripheral surface 22 of the rim portion 18 described above is formed larger than the cross-sectional area D1 of the cross section of the first rim spout 24. Therefore, even if the cleaning water further flows into and collides with the cleaning water staying in the region of the front end 8a of the bowl portion 8, the cleaning water will be passed over the inner peripheral surface 22 of the overhang shape of the rim portion 18 (through Since it can be received by the water channel 80), it is possible to prevent the occurrence of a water overflow phenomenon that overflows to the outside of the toilet body 2.

(Note: Paragraph numbers will be changed to serial numbers at the time of application.)
Next, by forming the cross-sectional area D2 of the water passage 80 larger than the cross-sectional area D1 of the cross section of the first rim spout 24, it is possible to prevent the occurrence of a water overflow phenomenon that overflows to the outside of the toilet body 2. Will be described in detail.

  The wash water discharged from the first rim water spouting port 24 formed slightly rearward of the central portion on the left side when viewed from the front of the inner peripheral surface 22 of the rim portion 18 of the bowl portion 8 is substantially horizontally discharged forward. While swirling on the bottom surface 8b of the bowl part 8 toward the front end 8a of the bowl part 8, a part of the swirling washing water flows down to the dirt receiving surface 16 of the bowl part 8 by its own weight. The surface 16 is cleaned. The amount of wash water flowing down is the “position”, “opening area”, “shape” of the first rim spout 24, “an angle inclined downward toward the center of the bowl portion on the bottom surface”, “width of the bottom surface” “Amount of change in the radius of curvature between the maximum radius of curvature R3 of the bowl portion and a radius of curvature R2 that is large and the minimum radius of curvature R1”, “Instantaneous flow rate of cleaning water discharged from the first rim spout 24” Etc. For example, the first rim water spouting port 24 is provided near the center of the bowl portion 8, and the cleaning water from the first rim water spouting port 24 has an instantaneous flow rate of about 40 to about 72 L / min and a curvature radius R 3 of about 310 mm. To about 390 mm, R2 is changed from about 230 mm to about 290 mm, R1 is changed from about 100 mm to about 120 mm, and the bottom surface is inclined downward by about 70 to about 90 degrees, and water is discharged in a substantially horizontal direction forward. Then, part of the cleaning water in the swirling washing water flows down to the filth receiving surface 16 of the bowl portion 8 by its own weight, so that the washing water that reaches the downstream side of the front end 8a of the bowl portion 8 and swirls. Is less than the flow rate discharged from the first rim water discharge port 24. For this reason, even if the cleaning water further flows into and collides with the cleaning water staying in the region of the front end 8a of the bowl portion 8, the cross-sectional area of the water passage 80 formed by the inner peripheral surface 22 of the rim portion 18. If D2 is formed larger than the cross-sectional area D1 of the cross section of the first rim spout 24, it can be received by the overhang-shaped inner peripheral surface 22 (water passage 80) of the rim portion 18.

  The washing water staying in the region of the front end 8a of the bowl portion 8 increases as the amount of change when changing from the large curvature radius R2 to the minimum curvature radius R1 increases, and decreases as it decreases. Further, the larger the instantaneous flow rate of the cleaning water discharged from the first rim water spouting port 24, the larger the flow rate becomes, and the smaller the smaller the smaller the smaller the instantaneous flow rate of cleaning water. The smaller the angle that is inclined downward toward the center of the bowl part on the bottom surface between the first rim water spouting port 24 and the region of the front end 8a of the bowl part 8, the smaller the smaller the angle.

  In particular, in the flush toilet 1 according to the present embodiment, a constant large flow of flush water is continuously supplied to the toilet body 2 by the water supply device 4 for a predetermined time, and a water overflow phenomenon is likely to occur. However, since the cross-sectional area D2 of the water passage 80 is formed larger than the cross-sectional area D1 of the cross section of the first rim spout 24, the flushing phenomenon prevents the wash water from overflowing outside the toilet body 2. it can.

  As described above, in the flush toilet 1 according to the present embodiment, even when the constant amount of flush water is continuously supplied to the toilet body 2 by the water supply device 4 for a predetermined time, In a region of the front end 8a having the smallest radius of curvature R1 in plan view, a straight line L1 lowered downward from the innermost peripheral end of the rim portion 18 in the vertical direction, and an inner peripheral surface of the bowl portion 8 positioned outside the straight line L1 Since the bowl portion 8 is formed so that the cross-sectional area D2 surrounded by is larger than the cross-sectional area D1 of the first rim spout 24, the wash water discharged from the first rim spout 24 is the bowl portion 8 Even if it stays in the region of the front end of the minimum curvature radius R 1, it can be received by the overhanging water passage 80 of the rim portion 18. As a result, according to the flush toilet 1 according to the present embodiment, it is possible to reliably prevent water overflow from the rim portion 18 to the outside of the toilet body 2. Furthermore, it is possible to achieve both water saving and cleanability of the bowl portion 8 while maintaining the cleanability due to the overhang shape in the rim portion 18.

  Further, since the rim portion 18 is formed so that the vicinity of the innermost peripheral end of the inner peripheral surface thereof is substantially horizontal in the region of the front end 8a having the minimum curvature radius R1 in plan view of the bowl portion 8. Even if the washing water stays in the water passage 80 on the inner peripheral surface of the portion 8 and overflows, the washing water that is about to overflow can be bounced back into the bowl portion 8, and from the rim portion 8 to the outside of the toilet body 2. It is possible to prevent the overflow of water.

  In addition, the bottom surface 8b (the outer peripheral surface of the filth receiving surface 16) surrounded by the straight line L1 and the inner peripheral surface of the bowl portion 8 is formed so as to incline downward toward the center of the bowl portion 8. Therefore, even if the washing water stays in the region of the front end 8a having the minimum curvature radius R1, the staying washing water falls to the bowl portion 8 due to its own weight, so that overflow of water can be prevented. it can.

  Further, in the flush toilet 1 according to the present embodiment, the maximum curvature radius from the curvature radius R2 through the position P1 of the front end 8a of the bowl portion 8 from the position P1 from the maximum curvature radius R3 of the bowl portion 8 to the curvature radius R2. In a region S1 up to a position P3 that becomes R3, an area of a cross section surrounded by a straight line drawn downward from the innermost peripheral edge of the rim portion 18 in the vertical direction and an inner peripheral surface of the bowl portion located outside the straight line ( The bowl portion 8 is formed such that the cross-sectional area of the water passage 80 is larger than the cross-sectional area D1 of the water outlet of the first rim water outlet 24.

  As a result, in the flush toilet 1 according to the present embodiment, even when the constant amount of flush water is continuously supplied to the toilet body 2 by the water supply device 4 for a predetermined period of time, in the region S1 described above, Since the area of the cross section of the water channel 80 is formed to be larger than the cross section D1 of the water discharge port of the first rim water discharge port 24, the wash water discharged from the first rim water discharge port 24 stays in the region S1. Even so, since it can be received by the overhang-shaped inner peripheral surface 22 (water flow path 80) of the rim portion 18, the above-described "water overflow phenomenon" can be reliably prevented. .

  Further, in the flush toilet 1 according to the present embodiment, as a modification, in the region S2 from the position P2 of the front end 8a of the bowl portion 8 to the position P3 where the curvature radius R2 is the maximum curvature radius R31, the rim portion 18 The area of the cross section (area of the cross section of the water passage 80) surrounded by the straight line drawn downward from the innermost peripheral edge in the vertical direction and the inner peripheral surface of the bowl portion located outside the straight line is the first rim spout. The bowl portion 8 is formed so as to be larger than the cross-sectional area D1 of 24 water outlets.

  Thereby, in the flush toilet 1 by the modification of this embodiment, even if it is a case where the washing water of a fixed large flow volume is continuously supplied to the toilet body 2 for a predetermined time by the water supply device 4, the above-described region S2 , The area of the cross section of the water passage 80 is formed so as to be larger than the cross section D1 of the water discharge port of the first rim water discharge port 24, so that the wash water discharged from the first rim water discharge port 24 is a region. Even if it stays in S1, it can be received by the overhang-shaped inner peripheral surface 22 (water passage 80) of the rim portion 18, so that the above-mentioned "water overflow phenomenon" can be reliably prevented. It has become.

DESCRIPTION OF SYMBOLS 1 Flush toilet 2 Toilet body 4 Water supply device 5 Water storage tank 6 Jet pump unit 8 Bowl part 16 Soil receiving surface 18 Rim part 22 Inner peripheral surface 24 First rim water outlet 26 Second rim water outlet 80 Water passage D1 Cross-sectional area D2 of the first rim spout Cross-sectional area of the water passage on the inner peripheral surface of the rim part

Claims (7)

A flush toilet that supplies washing water to the toilet body for washing,
A water supply device connected to the toilet body and supplying a constant large flow of flush water to the toilet body continuously for a predetermined time;
A bowl portion comprising a bowl-shaped filth receiving surface, and a rim portion located on the upper edge and having an inner peripheral surface;
A rim water spouting part that spouts the wash water supplied from the water supply device in a substantially horizontal direction from the rim water spout along the inner peripheral surface of the rim part to form a swirling flow;
The rim portion is formed in an overhang shape whose inner peripheral surface is exposed in the inner space of the bowl portion and extends upward toward the inner space. Formed,
In the region of the smallest radius of curvature in plan view of the bowl portion, it is surrounded by a straight line drawn downward from the innermost peripheral end of the rim portion in the vertical direction and the inner peripheral surface of the bowl portion located outside the straight line. A flush toilet, wherein the bowl portion is formed so that a cross-sectional area of a cross-section is larger than a cross-sectional area of a water discharge port of the rim water discharge portion.   2. The flush toilet according to claim 1, wherein the rim portion is formed so that the vicinity of the innermost peripheral end of the inner peripheral surface thereof is substantially horizontal in a region having a minimum curvature radius in plan view of the bowl portion. .   The flush toilet according to claim 1 or 2, wherein a bottom surface of a cross section surrounded by the straight line and an inner peripheral surface of the bowl portion is formed to be inclined downward toward the center of the bowl portion.   In the plan view of the bowl part, a small curvature radius becomes the maximum curvature radius on the downstream side of the region of the minimum curvature radius from the position where the curvature radius is smaller than the maximum curvature radius on the upstream side of the region of the minimum curvature radius. In the region up to the position, the cross-sectional area of the cross section surrounded by the straight line that is lowered vertically from the innermost peripheral edge of the rim portion and the inner peripheral surface of the bowl portion that is located outside the straight line is the rim portion. The flush toilet according to any one of claims 1 to 3, wherein the bowl portion is formed so as to be larger than a cross-sectional area of a water discharge port of the water discharge portion. The bowl portion is formed so that the front end region has a minimum radius of curvature in plan view, the rim water spouting portion is disposed in a side region of the bowl portion and spouts washing water forward,
In the region from the small curvature radius on the downstream side to the position where the maximum curvature radius is reached from the front end of the bowl part, the straight line is vertically lowered from the innermost peripheral end of the rim part, and is located outside the straight line. The said bowl part is any one of the Claims 1 thru | or 3 formed so that the cross-sectional area of the cross section enclosed with the internal peripheral surface of the said bowl part might become larger than the cross-sectional area of the water discharge port of the said rim water discharge part. The flush toilet according to Item.   The said water supply apparatus is provided with the water storage tank which stores wash water, and the jet pump unit arrange | positioned in the state which at least one part was submerged in the said water storage tank. Flush toilet.   The jet pump unit of the water supply device is arranged so that one end thereof is connected to the inlet of the water conduit of the toilet body, and the other end is formed with a suction port, and the suction port is located at the lower part in the water storage tank. The flush toilet according to claim 6, further comprising: a throat pipe formed, and a jet nozzle that injects wash water toward a suction port of the throat pipe to induce a jet pump action.

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