JP6112347B2 - Flush toilet equipment - Google Patents

Description

  The present invention relates to a flush toilet apparatus that discharges filth to a drain pipe with washing water.

  As a method for supplying cleaning water to the bowl part of flush toilet equipment, water is supplied from a high pressure in the water pipe (direct pressure type) or water is supplied from a tank placed at a high place. A method (tank type) is known.

  Since the direct pressure flush toilet apparatus supplies water in the water pipe directly to the bowl portion, it is possible to perform continuous washing. However, when installed in an environment where the water pressure in the water pipe is low, the flow rate of the supplied water is lowered, and there is a problem that the cleaning performance is lowered.

  The tank-type flush toilet device uses the potential energy of the water stored in the tank to supply water to the bowl part, so that a large flow of flush water without being affected by the water pressure in the water pipe Can be supplied. However, since it is necessary to inject water into the tank after washing, it is difficult to perform continuous washing, and there is a problem that the flush toilet apparatus is not suitable for a situation where it is frequently used.

  In addition to these, in recent years, a flush toilet apparatus has been proposed in which washing water is supplied to the bowl portion by a jet pump. For example, a flush toilet apparatus described in Patent Document 1 below includes a tank that stores water, and a jet pump unit is disposed inside the tank while being submerged. The jet pump unit has a throat pipe. One end of the throat pipe is connected to a flow path toward the bowl portion, and an opening is formed at the other end. When water is sprayed from the spray nozzle to the inside of the throat pipe through the opening, a jet pump action is induced, so that a large flow of water flows toward the bowl portion inside the throat pipe. Since not only water jetted from the jet nozzle but also water stored in the tank is drawn and flows through the throat pipe, a large amount of water is supplied to the bowl portion.

  As described above, the flush toilet apparatus of the type that supplies the wash water by the jet pump supplies a large flow of water to the bowl portion by the action of the jet pump, and thus is installed in an environment where the water pressure in the water pipe is low. In this case, it is possible to suppress a decrease in cleaning performance. Further, the total amount of cleaning water supplied to the bowl portion is approximately equal to the amount of water stored in the tank plus the amount of water jetted from the nozzle. For this reason, the amount of water that needs to be stored in the tank is smaller than that of the conventional tank type. Although it is necessary to inject water into the tank after the bowl part has been cleaned, the time required for water injection is shorter than that of the tank type, so the flush toilet device is frequently used. Can be continuously washed.

  Patent Document 2 listed below is a flush toilet apparatus that uses a jet pump to supply cleaning water, and sprays water into the throat pipe (supply of cleaning water to the bowl) and water injection into the tank. And a switching mechanism for switching between the nozzle and the throat pipe, that is, between the nozzle and the throat pipe. The switching mechanism has a sphere that moves up and down according to the level of water stored in the tank. When the water level is high, the sphere moves away from the inlet of the throat pipe due to buoyancy, and the water sprayed from the nozzle flows toward the inside of the throat pipe with almost no resistance. On the other hand, when the water level becomes low, the sphere moves downward and stays between the nozzle and the throat pipe, and water is prevented from entering the throat pipe. As a result, most of the water sprayed from the nozzle is poured into the tank and stored.

Japanese Patent No. 3312625 Japanese Patent No. 4713575

  The flush toilet apparatus described in the above-mentioned Patent Document 1 has a complicated structure composed of a ball tap, a branch pipe, and the like in order to switch from a state in which washing water is supplied toward the bowl portion to a state in which water is poured into the tank. A configuration switching mechanism is arranged in the tank. As a result, despite the fact that the amount of water stored in the tank is less than in the case of the tank type, the tank has become larger due to the arrangement of the switching mechanism, and the design of the flush toilet device has deteriorated. Yes. In addition, since the switching mechanism is arranged on the upstream side of the nozzle outlet, the flow rate of water sprayed from the nozzle is reduced due to the pressure loss in the switching mechanism, and the flow rate of cleaning water supplied to the bowl portion There is a possibility of lowering.

  As described above, the flush toilet apparatus described in Patent Document 2 has a switching mechanism disposed downstream of the nozzle injection port. Furthermore, when supplying the cleaning water to the bowl portion, the water sprayed from the nozzle is sprayed into the throat pipe with almost no resistance. For this reason, there is a low possibility that the flow rate of the cleaning water supplied to the bowl portion will decrease due to the effect of pressure loss. However, since the switching mechanism having a configuration in which the sphere moves up and down is arranged, the tank is still enlarged, and the design of the flush toilet device is deteriorated.

  The present invention has been made in view of such problems, and the purpose thereof is a flush toilet with high design that suppresses an increase in the size of a tank while adopting a method of supplying wash water to a bowl portion by a jet pump. To provide an apparatus.

  In order to solve the above-mentioned problems, a flush toilet apparatus according to the present invention is a flush toilet apparatus that discharges filth to a drain pipe with washing water, and has a bowl portion for receiving the filth, as washing water A toilet body with a water conduit for guiding the water to be supplied to the bowl portion formed therein, and water stored therein, so that the water can be supplied to the inlet of the water conduit And a jet pump unit disposed in a state where at least part of the tank is submerged inside the tank, the jet pump unit having one end connected to the inlet of the water conduit and the other end Is a tube in which a suction port is formed, and a throat tube arranged so that the suction port is located in the lower part of the inside of the tank, and from the suction port toward the inside of the throat tube A nozzle that induces a jet pump action by injecting high-speed water, wherein one of the throat pipe or the nozzle is capable of moving inside the tank; It can take a state stopped at one position and a state stopped at a second position, and the first position is injected when water is injected from the nozzle in a state stopped at the position. Water is supplied to the inside of the throat pipe from the suction port, and when the water is jetted from the nozzle while the second position is stopped at the position, the jetted water Among them, at least a part is a position where the suction port is removed and the tank is supplied to the inside of the tank.

  The flush toilet apparatus according to the present invention includes a tank and a jet pump unit as a mechanism for supplying flush water to the bowl portion of the toilet body.

  The tank stores water therein and is arranged so that the water can be supplied to the inlet of the water conduit. The water guide channel is a water channel formed inside the toilet body, and is formed so that water supplied from the inlet is guided to the bowl portion as wash water.

  The jet pump unit is disposed in a state where at least a part is submerged inside the tank, and includes a throat pipe and a nozzle.

  The throat pipe is a pipe having one end connected to the inlet of the water conduit and a suction port formed at the other end. As will be described later, the suction port is an opening that serves as an inlet when water stored in the tank is sucked into the throat pipe by the action of a jet pump, and is arranged at the lower part of the inside of the tank. Yes. The water stored in the tank flows from the suction port through the throat pipe, flows into the water conduit, and is guided to the bowl portion.

  The nozzle induces a jet pump action by jetting high-speed water from the suction port toward the inside of the throat pipe. When high-speed water is jetted from the nozzle toward the inside of the throat pipe, the water stored in the tank is drawn into the throat pipe by the water flow. As a result, the flow rate of water flowing in the throat pipe toward the water conduit is larger than the flow rate of water ejected from the nozzle.

  Further, in the flush toilet apparatus according to the present invention, one of the throat pipe and the nozzle can move inside the tank, and the movement is stopped at the first position and at the second position. It can be in a stopped state.

  The first position is a position such that when water is jetted from the nozzle in a state where the throat pipe or the nozzle is stopped at the position, the jetted water is supplied from the suction port to the inside of the throat pipe. That is, it is a position where the jet pump action as described above occurs and the cleaning water is supplied to the bowl portion.

  In the second position, when water is injected from the nozzle in a state where the throat pipe or the nozzle is stopped at the position, at least part of the injected water is removed from the suction port and supplied to the inside of the tank. It is such a position. That is, it is a position where water is poured into the tank.

  Thus, in the flush toilet apparatus according to the present invention, by moving one of the throat pipe or the nozzle inside the tank, the state in which the wash water is supplied to the bowl portion and the water injection to the tank is performed. Switching to the state to be performed (hereinafter also referred to as “flow path switching”) can be performed. The flow path switching as described above is performed only by changing the positional relationship between the minimum necessary members such as the throat pipe and the nozzle, without arranging a mechanical part such as a valve for switching the flow path in the tank. Can do. As a result, an increase in the size of the tank can be suppressed and a flush toilet device with high design can be obtained.

  In the flush toilet apparatus according to the present invention, the throat pipe includes a first throat portion that is a portion on the suction port side and a second throat portion that is a portion on the inlet side of the water conduit. It is also preferable that the first throat portion moves with respect to the second throat portion so that the state stopped at the first position and the state stopped at the second position can be taken. .

  In this preferred embodiment, the throat pipe has a first throat portion that is a portion on the suction port side and a second throat portion that is a portion on the inlet side of the water conduit. Of these, the first throat portion moves relative to the second throat portion, so that the state stopped at the first position as described above and the state stopped at the second position as described above can be taken. It has become a structure. The flow path is switched by moving a part of the throat part (first throat part on the suction port side) instead of moving the nozzle.

  When water is ejected from the nozzle, a large reaction force due to the water flow is applied to the nozzle. For this reason, when it is set as the structure which switches a flow path by moving a nozzle, possibility that the powerful actuator which can endure the reaction force will be high is high. Also, considering that it is necessary to accurately stop the nozzle at the first position or the second position, it is considered that a powerful actuator is still necessary.

  On the other hand, in this preferable mode, the flow path switching is performed by moving a part of the throat portion (first throat portion on the suction port side) instead of moving the nozzle as described above. Since a force such as a large reaction force caused by jetting water does not act on the throat, the throat can be moved stably by applying a relatively small force. For this reason, even if it is a case where the actuator for moving a 1st throat part is mounted, the small actuator which is not strong can be used. Further, for example, by using a buoyancy force, gravity, or the like applied to the throat, an electric actuator can be made unnecessary. Thus, according to this preferred embodiment, it is possible to simplify the mechanism for switching the flow path.

  Moreover, in the flush toilet apparatus according to the present invention, the jet pump unit further includes a float that moves the first throat portion according to a change in the water level of water stored in the tank, It is also preferable that the first throat portion is configured to move from the first position to the second position as the level of water stored in the tank decreases.

  In this preferable aspect, the jet pump unit further includes a float that moves the first throat portion in accordance with a change in the level of water stored in the tank. In other words, the position of the first throat portion is changed in accordance with the level of water stored in the tank.

  Specifically, the first throat portion is configured to move from the first position to the second position as the water level stored in the tank decreases.

  Thus, in this preferred embodiment, since the flow path is switched by the movement of the float without using an electric actuator, the structure of the jet pump unit becomes simpler, and the size of the tank is further increased. It is suppressed. In addition, since the flow path can be switched at an accurate timing according to the water level of the water stored in the tank, fluctuations in the amount of cleaning water supplied to the bowl portion are suppressed. As a result, the operation stability of the jet pump unit can be improved.

  Further, in the flush toilet apparatus according to the present invention, the first throat portion has a guide member, and the water jetted from the nozzle is in a state where the first throat portion is stopped at the second position. It is also preferable that the first throat portion is held at the second position by directly contacting the guide member.

  As described above, the first throat portion changes its position in accordance with the water level (water surface height) stored in the tank.

  By the way, in a state where the first throat portion is stopped at the second position, that is, in a state where water is poured into the tank, the surface of the water stored in the tank by the flow of water injected from the nozzle Will wave. As a result, the first throat portion is affected by fluctuations in the height of the water surface, and its position may fluctuate and deviate from the second position.

  When the position of the first throat part fluctuates and the first throat part moves out of the second position, the water sprayed from the nozzle is supplied again to the inside of the throat pipe, and the supply of cleaning water to the bowl part is resumed. Will end up. For this reason, when the first throat portion is stopped at the second position and water is being poured into the tank, it is desirable to apply a force that holds the first throat portion at the second position.

  So, in this preferable aspect, it is set as the structure which hold | maintains a 1st throat part in a 2nd position by utilizing the flow of the water injected from the nozzle. Specifically, the first throat portion has a guide member, and when the first throat portion is stopped at the second position, the water sprayed from the nozzle directly hits the guide member. ing. At this time, the first throat portion is held at the second position by the force received by the guide member from the jetted water flow.

  As described above, in this preferred embodiment, the first throat portion has a guide member so that the first throat portion can be prevented from changing, and the water can be stably poured into the tank after the flow path is switched. Making it possible.

  In the flush toilet apparatus according to the present invention, it is also preferable that the guide member is at least a part of the float.

  In this preferred embodiment, the guide member is at least a part of the float. Part or all of the float also functions as a guide member for suppressing fluctuations in the first throat portion. Since the float also serves as a guide member, the number of parts arranged inside the tank is reduced, and the tank can be further miniaturized.

  In the flush toilet apparatus according to the present invention, the first throat portion is connected to the second throat portion via a swing shaft so that the first throat portion moves along a vertical plane. In addition, it is preferable that the swing shaft is disposed on the lower surface side of the first throat portion and the second throat portion.

  In this preferred embodiment, the first throat portion is connected to the second throat portion via the swing shaft. Specifically, the throat pipe is divided into a first throat portion and a second throat portion, and both are connected via a swing shaft. In this preferred embodiment, the swing shaft is further disposed on the lower surface side of the first throat portion and the second throat portion so that the first throat portion moves along the vertical plane.

  As a result, the direction in which the first throat portion moves is along the direction of gravity (vertically downward) acting on the first throat portion. For this reason, when the float moves, gravity having a stable size can be efficiently used as a force for moving the first throat portion. As a result, even when the water level stored in the tank is undulating, the flow path can be switched stably, and the amount of cleaning water supplied to the bowl portion varies. Can be suppressed.

  Further, in the flush toilet apparatus according to the present invention, in the state where the first throat portion is stopped at the first position, the traveling direction of the water sprayed from the nozzle is relative to the central axis of the first throat portion. And non-parallel.

  In a state where the first throat portion is stopped at the first position and water is being jetted from the nozzle, the first throat portion is subjected to force by the jetted water flow. For example, when the sprayed water is directed to the upper wall surface in the first throat portion, the first throat portion receives an upward force. On the other hand, when the jetted water goes to the lower wall surface in the first throat portion, the first throat portion receives a downward force.

  In this preferable aspect, in a state where the first throat portion is stopped at the first position, the traveling direction of the water sprayed from the nozzle is configured to be non-parallel to the central axis of the first throat portion. . As a result, the first throat portion receives a force caused by the water sprayed from the nozzle toward the inner wall surface, so that the force is used as a force for holding the first throat portion in the first position, for example. Is possible.

  By the way, in the state where the first throat portion is stopped at the first position, the design is such that the traveling direction of the water sprayed from the nozzle is parallel to the central axis of the first throat portion. The jetted water does not go to the inner wall surface, and such a force should not occur. However, even with such a design, the traveling direction of the water sprayed from the nozzle is actually relative to the central axis of the first throat part due to errors in part shapes and errors that occur during assembly. There is a possibility of becoming non-parallel.

  In this case, the direction in which the error occurs (the direction in which the traveling direction of the water sprayed from the nozzle is inclined with respect to the central axis of the first throat portion) is random. Accordingly, for example, there may be a force that holds the first throat portion in the first position, or a force that biases the first throat portion toward the second position. There is also. As a result, there is a possibility that the timing at which the flow path is switched varies greatly from product to product.

  On the other hand, in this preferable aspect, in the state where the first throat portion is stopped at the first position, the traveling direction of the water sprayed from the nozzle is not parallel to the central axis of the first throat portion. It has a configuration (design). That is, the traveling direction of the water sprayed from the nozzle is not parallel to the central axis of the first throat portion, but is intentionally inclined toward a predetermined direction. For this reason, although the magnitude of the force acting on the first throat portion may fluctuate due to an error in part shape or an error that occurs during assembly, the direction of the force (with the center axis of the first throat portion sandwiched) ) There will be no inversion. As a result, it is possible to prevent the timing at which the flow path is switched from changing greatly due to an error for each product.

  Further, in the flush toilet apparatus according to the present invention, a plane including both the central axis of the first throat portion at the first position and the central axis of the first throat portion at the second position. When defined as a moving surface, in the state where the first throat portion is stopped at the first position, the traveling direction of water sprayed from the nozzle is not parallel to the central axis of the first throat portion. It is also preferable that the plane is parallel to the moving surface.

  In this preferred embodiment, in the state where the first throat portion is stopped at the first position, the traveling direction of the water sprayed from the nozzle is non-parallel to the central axis of the first throat portion and is on the moving surface. It is comprised so that it may become parallel with respect to. The moving surface is a plane including both the central axis of the first throat portion at the first position and the central axis of the first throat portion at the second position. In other words, when the first throat portion moves between the first position and the second position, the plane includes a trajectory through which the central axis of the first throat portion passes.

  By adopting such a configuration, in a state where the first throat portion is stopped at the first position, the first throat portion is a force in a direction from the first position toward the second position, or from the second position to the first position. One of the forces in the direction toward the position is received by the flow of water ejected from the nozzle. For this reason, the above-described force received by the first throat portion can be efficiently and stably used as a force for holding the first throat portion at the first position or the second position.

  Further, in the flush toilet apparatus according to the present invention, the first throat portion is configured to move along a vertical plane, and the nozzle in a state where the first throat portion is stopped at the first position. It is also preferable that the traveling direction of the water jetted from is a direction that suppresses the movement of the first throat portion from the first position to the second position.

  In this preferred embodiment, the first throat portion is configured to move along a vertical plane. The traveling direction of the water sprayed from the nozzle in a state where the first throat portion is stopped at the first position is a direction that suppresses the movement of the first throat portion from the first position to the second position. is there. When the water sprayed from the nozzle heads toward the inner wall surface of the first throat portion, the first throat portion receives a force in a direction that suppresses movement from the first position to the second position.

  With such a configuration, when the first throat portion is stopped at the first position, the first throat portion receives a force that is held at the first position by the flow of water ejected from the nozzle. Even if the buoyancy acting on the first throat portion fluctuates due to undulation of the water surface stored in the tank, the first throat portion is stably held at the first position. The Rukoto.

  Further, in the flush toilet apparatus according to the present invention, the amount of change in the magnitude of buoyancy that the float receives from the water stored in the tank with respect to the amount of change in the water level stored in the tank. When the absolute value of the ratio is defined as the buoyancy change rate, the buoyancy change rate when the first throat portion moves from the first position to the second position is the first throat portion It is also preferable that the rate of change in buoyancy when stopping at a position is larger.

  In this preferable aspect, the buoyancy change rate when the first throat portion moves from the first position to the second position is larger than the buoyancy change rate when the first throat portion stops at the first position. The rate of change in buoyancy is the absolute value of the ratio of the amount of change in the size of buoyancy received by the float to the amount of change in the level of water stored in the tank. That is, the absolute value of a value obtained by dividing the amount of change in the buoyancy received by the float by the amount of change in the water level stored in the tank.

  With such a configuration, the flow path switching is ensured by adopting a configuration in which the magnitude of the buoyancy received by the float is suddenly changed at the timing when the first throat portion should be moved from the first position to the second position. Can be performed.

  ADVANTAGE OF THE INVENTION According to this invention, the flush toilet apparatus with the high design property which suppressed the enlargement of a tank can be provided, setting it as the system which supplies a wash water to a bowl part with a jet pump.

It is sectional drawing which shows the flush toilet apparatus which concerns on 1st embodiment of this invention. It is a top view of the flush toilet apparatus shown in FIG. It is a figure which shows the inside of the tank of the flush toilet apparatus shown in FIG. It is a figure which shows the inside of the tank of the flush toilet apparatus shown in FIG. It is a disassembled perspective view which shows the specific structure of the throat pipe | tube arrange | positioned inside the tank shown in FIG. It is a figure for demonstrating operation | movement of the throat pipe | tube shown in FIG. It is a figure which shows the structure in the inside of the tank of the flush toilet apparatus shown in FIG. It is a figure for demonstrating supply of the water by a jet pump effect | action. It is a figure for demonstrating supply of the water by a jet pump effect | action. It is a graph which shows a mode that the water level of the water stored in the tank changes with progress of time. It is a figure which shows typically the state inside a tank. It is a figure which shows typically the state inside a tank. It is a figure which shows typically the state inside a tank. It is a figure which shows typically the state inside a tank. It is a figure which shows typically the state inside a tank. It is a figure which shows typically the state inside a tank. It is a figure which shows typically the state inside a tank. It is a graph which shows a mode that the water level etc. of the water currently stored by the tank change with progress of time. It is a figure which shows typically the state inside a tank. It is a figure which shows typically the state inside a tank. It is a figure which shows typically the state inside a tank. It is a figure which shows typically the state inside a tank. It is a figure which shows typically the state inside a tank. It is a figure which shows typically the state inside a tank. It is a figure which shows typically a mode that the water sprayed from the nozzle hits a part of float. It is a graph which shows the change of the flow volume of the water supplied to a rim | limb part from a tank. It is a figure for demonstrating the water surface fall which arises in the water surface of a tank. It is a figure for demonstrating the water surface fall which arises in the water surface of a tank. It is a figure for demonstrating the water surface fall which arises in the water surface of a tank. It is a top view which shows the positional relationship of the suction opening of a throat pipe, and the toilet bowl main body. It is a figure for demonstrating the shape of a throat pipe | tube in the flush toilet device which concerns on 2nd embodiment of this invention. It is a figure which shows typically the shape of a throat pipe | tube in the flush toilet apparatus which concerns on 3rd embodiment of this invention. It is a figure for demonstrating the motion of a throat pipe | tube in the flush toilet apparatus which concerns on 4th embodiment of this invention. It is a figure for demonstrating the shape of the tank in the flush toilet apparatus which concerns on 5th embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  A flush toilet apparatus according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view of the flush toilet apparatus FT, showing a cross section when the flush toilet apparatus FT is cut along a plane perpendicular to the left-right direction. FIG. 2 is a top view of the flush toilet apparatus FT. In FIG. 2, in order to show the internal structure of the tank 20 described later, a state in which the upper cover 201 of the tank 20 is removed is illustrated.

  As shown in FIGS. 1 and 2, the flush toilet apparatus FT includes a toilet body 10 and an upper surface 101 of the toilet body 10 on the rear side (right side in FIG. 1, upper side in FIG. 2) of the toilet body 10. And a tank 20 installed in the vehicle. The flush toilet device FT is a device that receives filth by the toilet body 10 and discharges the filth to the drain pipe SW with water (wash water) supplied from the tank 20.

  In the following description, the right side (left side in FIG. 2) viewed from the user seated on the toilet body 10 is referred to as the “right side” and is seated on the toilet body 10 unless otherwise specified. The left side when viewed from the state user is referred to as the “left side” (right side in FIG. 2). Further, the front side (left side in FIG. 1, lower side in FIG. 2) viewed from the user seated on the toilet body 10 is referred to as “front side” or “front side” and is seated on the toilet body 10. The rear side (the right side in FIG. 1 and the upper side in FIG. 2) viewed from the user in this state is referred to as “rear side” or “rear side”.

  The toilet body 10 includes a bowl portion 110, a rim portion 120, a water conduit 130, and a drain trap conduit 140. The bowl part 110 is a part that temporarily receives the filth falling from above. The rim portion 120 is formed on the upper edge portion of the bowl portion 110 and has a shape in which a part of the inner side surface of the bowl portion 110 is retreated toward the outer peripheral side as shown in FIG. Yes. As will be described later, the rim 120 is a flow path in which water supplied toward the bowl 110 is swirled. The rim part 120 is formed as a substantially circular (top view) flow path that goes around the upper edge of the bowl part 110.

  The water conduit 130 is a channel formed inside the toilet body 10 in order to guide the water supplied from the tank 20 to the bowl portion 110. One end of the water conduit 130 opens on the upper surface 101 of the toilet body 10, and serves as an inlet 131 for water supplied from the tank 20. The position where the inlet 131 is formed is a rear portion of the upper surface 101 of the toilet body 10 and a central portion in the left-right direction.

  The water conduit 130 is branched into two flow paths (a first water conduit 132 and a second water conduit 134) on the downstream side thereof. The downstream end of the first water conduit 132 that is one of the channels opens at the right side of the rim portion 120, and the opening serves as the water outlet 133. When water is supplied from the tank 20 to the inlet 131, a part of the water passes through the inside of the first water conduit 132 and is ejected from the outlet 133 and supplied to the rim portion 120.

  The second water conduit 134, which is the other channel, is open at the downstream end of the rim portion 120 on the left side and the rear side, and the opening serves as the water outlet 135. When water is supplied from the tank 20 to the inlet 131, a part of the water passes through the inside of the second water conduit 134 and is ejected from the outlet 135 and supplied to the rim portion 120.

  The direction in which water is ejected from the outlet 133 is a direction along the circumference of the rim portion 120 formed as a substantially circular flow path, and is a counterclockwise direction when viewed from above. The direction in which water is ejected from the outlet 135 is also a direction along the circumference of the rim portion 120 formed as a substantially circular flow path, and is also a counterclockwise direction when viewed from above. For this reason, water spouted from the outlet 133 and the outlet 135 to the rim portion 120 flows down from the entire rim portion 120 toward the bowl portion 110 while swirling counterclockwise along the rim portion 120 and flowing. .

  The drain trap pipe 140 is a flow path that connects the lower end of the bowl part 110 and the drain pipe SW. The drain trap pipe 140 has an ascending channel 141 formed so as to rise upward along the direction from the lower end of the bowl portion 110 toward the downstream, and along the direction from the upper end of the ascending channel 141 toward the downstream. And a descending flow path 142 formed to have a downward slope. With such a configuration, water can be stored in a portion extending from the lower portion of the bowl portion 110 to the lower portion of the ascending flow path 141, and the sealed water WT is formed by the stored water. A drain pipe SW is connected to the lower end of the descending flow path 142. The drain pipe SW is a pipe arranged inside the building, and its downstream end is connected to the sewer pipe.

  When water is supplied from the tank 20 toward the bowl portion 110, the water flows down from the entire rim portion 120 toward the bowl portion 110 while swirling and flowing through the rim portion 120 as described above. Water is added to the bowl part 110 from above, and is discharged from the lower end part through the ascending channel 141 and the descending channel 142. As a result, a downward flow occurs in the water (sealed water WT) stored in the bowl portion 110.

  The filth that has been temporarily received in the bowl portion 110 is pushed downward by the water supplied from the upper rim portion 120 and moves toward the lower end of the bowl portion 110. Thereafter, the filth passes through the ascending channel 141 and reaches the descending channel 142 by the water flow, and falls together with the water toward the drain pipe SW.

  As apparent from the above description, the flush toilet apparatus FT is a so-called “wash-out” flush toilet apparatus. In other words, the flush toilet apparatus FT is not of a type in which siphon action is induced in the bowl portion 110 and the flow path on the downstream side thereof, and the filth is directed to the drain pipe SW by the water supplied from the tank 20. Extruding method.

  The tank 20 is a container in which water is stored, and supplies the water to the inlet 131 of the water conduit 130. The tank 20 includes a first tank part 210 and a second tank part 220 formed so as to extend a part of the bottom wall 211 of the first tank part 210 downward. The first tank part 210 and the second tank part 220 are both substantially rectangular parallelepiped containers, and their internal spaces communicate with each other. The second tank portion 220 is connected to a rear portion of the bottom wall 211 of the first tank portion 210.

  The bottom wall 211 of the first tank part 210 (the part on the front side of the second tank part 220) is in a state of being close to the part on the rear side of the upper surface 101 of the toilet body 10 from above. Specifically, an inlet 131 is formed in a rear side portion of the upper surface 101 of the toilet body 10, but the bottom wall 211 of the first tank unit 210 covers the periphery of the inlet 131 from above. The upper surface 101 of the toilet body 10 is close to the upper surface 101 from above. In addition, an opening 212 having substantially the same shape as the inlet 131 is formed in the bottom wall 211, and the opening 212 and the inlet 131 overlap in a top view. For this reason, the water stored in the tank 20 can flow into the water conduit 130 through the opening 212 and the inlet 131 and flow toward the bowl portion 110.

  As a result of arranging the first tank part 210 as described above, the second tank part 220 is located behind the toilet body 10. That is, it is in a state of being located further rearward than the rear end of the toilet body 10. Further, the bottom wall 221 of the second tank unit 220 is disposed at a position lower than the upper surface 101 of the toilet body 10.

  By arranging the tank 20 as described above, the front end portion of the tank 20 is positioned in front of the rear end portion of the toilet body, and the lower end portion of the tank is more than the upper surface of the toilet body. Is also located on the lower side. As a result, the dimension in the front-rear direction and the dimension in the vertical direction of the entire flush toilet apparatus FT are both small, and the design of the flush toilet apparatus FT is improved.

  Moreover, since only the 2nd tank part 220 is installed in the downward side rather than the upper surface of the toilet bowl main body among the tanks 20, the water head stored in the tank 20 is maintained. As a result, while the downsizing of the flush toilet apparatus FT as described above is realized, the performance of the jet pump unit 300 described later (performance of supplying a predetermined amount and a predetermined flow of water toward the rim portion 120). Is maintained.

  Next, the internal configuration of the tank 20 will be described. FIG. 3 is a rear view showing the inside of the tank 20 when the flush toilet apparatus FT is viewed from the rear side. FIG. 4 is a perspective view showing the inside of the tank 20 when the flush toilet apparatus FT is viewed from the rear side. As shown in FIGS. 3 and 4, a water supply pipe 231, a main valve 233, a pilot valve 234, and a jet pump unit 300 are disposed inside the tank 20.

  The water supply pipe 231 is a pipe for supplying water toward the main valve 233, and is arranged to extend vertically upward from the bottom wall 221 of the second tank portion 220. One end of the water supply pipe 231 is connected to a water pipe (not shown) outside the tank 20. The other end (upper end) of the water supply pipe 231 is connected to the main valve 233 from below in the tank 20. The water supply pipe 231 is disposed in the tank 20 at a position on the left side of the center in the left-right direction.

  In the middle of the water supply pipe 231 (between the water pipe and the main valve 233), a constant flow valve 232 (not shown in FIGS. 3 and 4) is arranged. When the main valve 233 is opened, the flow rate of water flowing into the main valve 233 is constant by the constant flow valve 232, and does not vary with the water pressure of the water pipe.

  The main valve 233 is an open / close valve that opens and closes the water flow path from the water supply pipe 231 to the jet pump unit 300. A vacuum breaker 235 is provided between the main valve 233 and the jet pump unit 300, and the upstream side of the vacuum breaker 235 is prevented from being negatively pressured to prevent water from flowing backward. As described above, the water supply pipe 231 extends upward, and the main valve 233 and the vacuum breaker 235 are arranged at a high position in the tank 20. Therefore, even when the tank 20 is full, the vacuum breaker 235 will not be submerged.

  The main valve 233 is provided with a pilot valve 234, and the operation of the pilot valve 234 is configured to switch between opening and closing of the main valve 233. A manual lever 236 disposed outside the tank 20 is connected to the pilot valve 234 via a transmission mechanism 237 disposed inside the tank 20. Further, a float 238 disposed inside the tank 20 is further connected to the pilot valve 234.

  When the manual lever 236 is operated by the user of the flush toilet apparatus FT, the operation is transmitted to the pilot valve 234 via the transmission mechanism 237, and the pilot valve 234 is opened. As a result, the main valve 233 is opened, and water flows from the water supply pipe 231 toward the jet pump unit 300. As will be described later, the water flowing toward the jet pump unit 300 is supplied to the water conduit 130 as cleaning water together with the water stored in the tank 20. For this reason, the water level inside the tank 20 gradually decreases.

  Even after the cleaning of the bowl part 110 is completed, the main valve 233 is not closed, and water continues to flow from the water supply pipe 231 toward the jet pump unit 300. The water that flows toward the jet pump unit 300 is supplied into the tank 20 and stored for the next cleaning. When water is supplied to the inside of the tank 20 (water injection into the tank 20), the water level inside the tank 20 gradually rises. The float 238 connected to the pilot valve 234 inside the tank 20 rises as the water level rises, whereby the pilot valve 234 is closed. That is, when the water level in the tank 20 rises, the pilot valve 234 is closed by a change in buoyancy that the float 238 receives. When the pilot valve 234 is closed, the main valve 233 is closed, and the supply of water from the water supply pipe 231 to the jet pump unit 300 is stopped. At this time, the arrangement of the float 238 is adjusted so that the amount of water stored in the tank 20 becomes a necessary amount for the next cleaning (so as to reach a predetermined full water level). .

  The jet pump unit 300 is for inducing a jet pump action by the water supplied from the water supply pipe 231 and thereby supplying water toward the water conduit 130. The jet pump unit 300 includes a nozzle 310 and a throat pipe 320.

  The nozzle 310 is a tube having one end connected to the vacuum breaker 235 via a connecting tube 239 and the other end formed with an injection port 311. The nozzle 310 is disposed in the vicinity of the bottom wall 221 of the second tank unit 220. When the main valve 233 is opened, the water supplied from the water supply pipe 231 flows through the connection pipe 239, reaches the nozzle 310, and is injected from the injection port 311 as a high-speed water flow. The nozzle 310 is disposed at the rear side and right corner (corner in top view) of the second tank portion 220. As shown in FIGS. 3 and 4, the nozzle 310 is U-shaped, and its downstream side is folded from the corner. In the state shown in FIGS. 3 and 4, the injection direction of the injection port 311 is directed to the inside of the throat pipe 320.

  The throat pipe 320 is a pipe having a circular cross section, and is disposed inside the tank 20 in a state of passing through an opening 212 formed in the bottom wall 211. One end of the throat pipe 320 is connected to the inlet 131 of the water conduit 130, and a suction port 331 that is an opening is formed at the other end. In the throat pipe 320, a portion on the inlet 131 side of the water conduit 130 is along the vertical direction, and a portion on the suction port 331 side is inclined with respect to the horizontal plane. For this reason, the whole becomes an inverted U shape. As shown in FIG. 2, the throat pipe 320 is disposed inside the tank 20 in a state inclined with respect to the front-rear direction in a top view.

  A specific configuration of the throat pipe 320 will be described with reference to FIG. FIG. 5 is an exploded perspective view of the throat pipe. As shown in FIG. 5, the throat pipe 320 has a configuration in which two pipes (first throat pipe 330 and second throat pipe 350) are connected in series to form a single pipe.

  The first throat pipe 330 is a part of the throat pipe 320 on the suction port 331 side, and is a part arranged in an inclined state with respect to the horizontal plane as described above. The first throat pipe 330 is a cylindrical pipe whose diameter is uniform throughout. The suction port 331 is formed at the lower end of the first throat pipe 330. The suction port 331 is formed so that the entire edge thereof is along a surface inclined with respect to the central axis of the first throat pipe 330. In the state shown in FIGS. The edge is along a horizontal plane. That is, the edge of the suction port 331 is parallel to the water surface in the tank. On the other hand, the opening 332 formed at the upper end of the first throat pipe 330 has an edge along a plane perpendicular to the central axis of the first throat pipe 330. A float 380 is fixed to the lower end portion of the first throat pipe 330 with a bolt B so as to surround the periphery (side surface) of the suction port 331.

  The second throat pipe 350 is a portion of the throat pipe 320 on the water conduit 130 side. The second throat pipe 350 has a vertical portion 351 extending vertically upward from the inlet 131 of the water conduit 130 and a bent portion 352 bent from the upper end of the vertical portion 351 toward the first throat pipe 330. Yes. An opening 353 is formed at the end of the bent portion 352 on the first throat pipe 330 side. The edge of the opening 353 is along a plane perpendicular to the flow path direction of the bent portion 352 in the portion.

  The vertical portion 351 is a cylindrical tube whose tube diameter is uniform throughout. The pipe diameter of the vertical portion 351 is larger than the pipe diameter of the first throat pipe 330. The tube diameter of the bent portion 352 on the vertical portion 351 side is equal to the tube diameter of the vertical portion 351. Further, the diameter of the bent portion 352 on the first throat pipe 330 side is equal to the diameter of the first throat pipe 330. For this reason, it can be said that the vertical part 351 and the first throat pipe 330 having different pipe diameters are smoothly connected by the bent part 352.

  The first throat pipe 330 and the second throat pipe 350 are connected via a rod-shaped shaft 341 with the opening 332 and the opening 353 aligned with each other. The shaft 341 is disposed below the opening 332 and the opening 353. Further, the shaft 341 is arranged so that the central axis thereof is horizontal and perpendicular to the central axis of the first throat pipe 330. The first throat pipe 330 can move so as to rotate with respect to the second throat pipe 350 about the shaft 341 as a rotation axis. The throat pipe 320 has a state in which the opening 332 and the opening 353 are in contact with each other without a gap and a gap is formed between the opening 332 and the opening 353 as the first throat pipe 330 moves as described above. And can take.

  On the lower surface side of the first throat pipe 330 and in the vicinity of the opening 332, a protrusion 333 protruding downward is formed. A plate-like stopper 354 extending toward the lower side of the protrusion 333 is formed on the lower surface side of the second throat pipe 350 and in the vicinity of the opening 353. When the opening 332 and the opening 353 are in contact with each other without a gap, the tip of the protrusion 333 and the stopper 354 are separated from each other. On the other hand, when the first throat pipe 330 rotates about the shaft 341 as the rotation axis and the gap formed between the opening 332 and the opening 353 becomes larger, the tip of the protrusion 333 hits the upper surface of the stopper 354, The throat tube 330 can no longer rotate.

  The operation of the first throat pipe 330 will be further described with reference to FIG. FIG. 6A shows a state where the opening 332 and the opening 353 are in contact with each other without a gap. The position of the first throat pipe 330 in this state is also referred to as “first position” below.

  As shown in FIG. 6A, when water is ejected from the ejection port 311 of the nozzle 310 in a state where the first throat pipe 330 is in the first position, the ejected high-speed water is the first throat pipe 330. It flows toward the inside. The lower part of the first throat pipe 330 and the nozzle 310 are submerged in the water stored in the tank 20. For this reason, a part of the water stored in the tank 20 is drawn into the first throat pipe 330 by the high-speed water flow injected from the injection port 311 and flows toward the water conduit 130. As a result of inducing such a jet pump action, not only water jetted from the jet port 311 of the nozzle 310 but also water drawn from around the suction port 331 flows inside the first throat pipe 330. These flow through the water conduit 130 as cleaning water and are supplied to the rim portion 120.

  As described above, in the flush toilet apparatus FT, the flow rate of water supplied to the rim portion 120 is larger than the flow rate of water injected from the injection port 311 of the nozzle 310. In other words, even when the flow rate of water ejected from the ejection port 311 of the nozzle 310 is small, water having a sufficient flow rate as cleaning water is supplied to the rim portion 120. For this reason, even if the flush toilet apparatus FT is installed in a low environment where the water pressure of the water pipe is small, sufficient washing performance can be exhibited.

  Further, the total amount of water supplied to the rim portion 120 (and the bowl portion 110) as cleaning water is the amount of water previously stored in the tank 20 and the amount of water injected from the injection port 311 of the nozzle 310. The amount is added. Since it is not necessary to store all the wash water inside the tank 20, the tank 20 is downsized and its design is improved.

  By the way, of the water stored in the tank 20, the water present in the portion below the suction port 331 is not supplied from the suction port 331 to the inside of the first throat pipe 330. As a result, it remains as residual water in the tank 20. However, as shown in FIG. 3 and the like, both the nozzle 310 and the suction port 331 are disposed inside the (narrow) second tank portion 220. For this reason, the amount of residual water remaining in the portion below the suction port 331 is relatively small.

  With such a configuration, the flush toilet apparatus FT reduces the amount of residual water at the time when the supply of water to the rim portion 120 is completed. As a result, most of the internal space of the tank 20 can be used as a space for storing water supplied to the rim portion 120 (water that does not become residual water). The increase in size is suppressed.

  FIG. 6B shows a state in which the first throat pipe 330 rotates around the shaft 341 as the rotation axis from the state of FIG. 6A and the tip of the protrusion 333 hits the upper surface of the stopper 354. In other words, the state where the gap formed between the opening 332 and the opening 353 is the largest is shown. The position of the first throat pipe 330 in this state is also referred to as “second position” below.

  As shown in FIG. 6B, when water is ejected from the ejection port 311 of the nozzle 310 in a state where the first throat pipe 330 is in the second position, the ejected high-speed water comes off the suction port 331. Therefore, it is not supplied into the first throat pipe 330. The water injected from the injection port 311 is supplied to the inside of the tank 20 (around the first throat pipe 330) and stored in the tank 20.

  When the position of the first throat pipe 330 is switched from the first position to the second position while water is being injected from the injection port 311 of the nozzle 310, the supply of water to the rim portion 120 is stopped, and the tank Water injection to 20 is started. As described above, in the flush toilet apparatus FT, by moving a part of the throat pipe 320 inside the tank 20, the water is supplied to the rim portion 120 (the bowl portion 110), and the tank 20 is moved. It is possible to switch to a state where water injection is performed (hereinafter also referred to as “flow channel switching”). In other words, the throat pipe 320 functions as a flow path switching valve that switches a supply destination of water ejected from the ejection port 311 of the nozzle 310. Since it is not necessary to separately arrange a mechanical component such as a valve for switching the flow path inside the tank 20, an increase in the size of the tank 20 is suppressed.

  The force for holding the first throat pipe 330 in the first position, the force for switching the first throat pipe 330 from the first position to the second position, and the like will be described in detail later.

  The other configuration inside the tank 20 will be described with reference to FIG. 4 again. As shown in FIG. 4, a partition wall 240 is disposed inside the tank 20 so as to surround the vertical portion 351 of the throat pipe 320. The partition wall 240 is formed to extend upward from the bottom wall 211. A part of the internal space of the tank 20 is partitioned by the partition wall 240, the front side wall surface 213 of the tank 20, the left side wall surface 214, and the bottom wall 211 of the first tank portion 210, thereby forming a small tank 260. The small tank 260 is a container having an upper portion opened to the inside of the tank 20, and is disposed in the front and left corner of the first tank unit 210. In the throat pipe 320, the lower end portion of the vertical portion 351 is disposed inside the small tank 260. Further, the suction port 331 is disposed outside the small tank 260.

  An opening / closing window 241 is provided in the vicinity of the lower end of the partition wall 240. The opening / closing window 241 is normally open, and the inside and outside of the small tank 260 communicate with the outside (the space behind the partition wall 240) through the opening / closing window 241. For this reason, in a state where the bowl part 110 is not washed (standby state), the water level stored in the tank 20 and the water level stored in the small tank 260 are equal.

  The manual lever 236 can be operated in two directions (large direction and small direction). When the manual lever 236 is operated in a large direction, the pilot valve 234 and the main valve 233 are opened while the open / close window 241 is opened. The water stored in the small tank 260 passes through the opening / closing window 241, flows out into the second tank unit 220, and reaches the suction port 331. For this reason, most of the water stored in the tank 20, including the amount stored in the small tank 260, is drawn into the throat pipe 320 and supplied to the rim portion 120.

  On the other hand, when the manual lever 236 is operated in the small direction, the open / close window 241 is closed and the pilot valve 234 and the main valve 233 are opened simultaneously. For this reason, the water stored in the small tank 260 out of the water stored in the tank 20 cannot pass through the opening / closing window 241 and remains in the small tank 260. As a result, the amount of water supplied to the rim portion 120 as cleaning water is small.

  In the following description, “the water level stored in the tank 20” or “the water level in the tank 20” indicates the water level outside the small tank 260. That is, the water level stored in the space in which the suction port 331 is arranged in the space divided into two by the partition wall 240 is shown. The water level stored in the small tank 260 is not considered in the following description.

  FIG. 7 schematically shows a configuration inside the tank 20. As already described, the water supply pipe 231, the main valve 233, the pilot valve 234, the small tank 260, and the jet pump unit 300 are arranged inside the tank 20.

  In a state where the bowl portion 110 is not cleaned (standby state), the water level of the tank 20 is full, and the first throat pipe 330 is in the first position. When the manual lever 236 is operated by the user of the flush toilet apparatus FT, the main valve 233 is opened as described above, and water is injected from the injection port 311 of the nozzle 310 (arrow in FIG. 7). AR1). The water stored in the tank 20 is drawn into the throat pipe 320 (arrow AR2 in FIG. 7) and supplied to the rim portion 120 as the cleaning water (arrow AR3 in FIG. 7).

  When the supply of water to the rim portion 120 is completed, the position of the first throat pipe 330 is switched from the first position to the second position, and water injection into the tank 20 is started (arrow AR4 in FIG. 7). The water level in the tank 20 gradually rises, and the pilot valve 234 is closed by the float 238 when the water level becomes full. At the same time, the main valve 233 is closed, whereby the water injection into the tank 20 is completed and the standby state is restored.

  The relationship between the flow rate of water ejected from the ejection port 311 of the nozzle 310 and the flow rate of water supplied to the rim portion 120 will be described with reference to FIGS. 8 and 9. FIG. 8 is a diagram for explaining the supply of water by the action of the jet pump, and the flow rate of water supplied from the outside (water supply pipe 231) toward the tank 20 and from the tank 20 toward the toilet body 10. The relationship with the flow rate of the supplied water is schematically depicted.

  As already described, in the flush toilet apparatus FT, since the jet pump action is induced by the jet pump unit 300, the flow rate of water supplied from the water supply pipe 231 and injected from the injection port 311 of the nozzle 310 (arrow AR5 ), The flow rate of water supplied to the rim portion 120 through the throat pipe 320 (arrow AR6) is larger. The tank 20 is installed at a position higher than the inlet 131 of the water conduit 130. For this reason, the flow rate of the water supplied to the rim portion 120 is further increased by the potential energy of the water stored in the tank 20. In other words, the water stored in the tank 20 may have a flow that is supplied to the water conduit 130 by a jet pump action and a flow that is supplied to the water conduit 130 by the head (potential energy). It has become.

  When water is ejected from the ejection port 311 of the nozzle 310, the flow rate is amplified, so that a large flow rate of water is supplied from the tank 20 toward the toilet body 10 (rim portion 120). In the present embodiment, the amount of water ejected from the ejection port 311 is 20 liters / minute. On the other hand, the amount of water supplied from the tank 20 through the throat pipe 320 to the toilet body 10 is 80 liters / minute. That is, the amplification factor is four times.

  FIG. 9 is a diagram for explaining the supply of water by the action of the jet pump, in which the flow rate of the water supplied to the toilet body 10 changes with time (graph G1) and from the injection port 311 to the tank 20. The time change (graph G2) of the flow rate when water injection is performed is shown. When the manual lever 236 is operated at time t0 and thereby water starts to be injected from the injection port 311 of the nozzle 310, water is supplied to the toilet body 10 at a flow rate of 80 liters / minute. In the present embodiment, the toilet main body 10 needs to supply 3.6 liters of water as washing water. Accordingly, water is supplied to the toilet body 10 for 2.7 seconds. When 2.7 seconds have elapsed from time t0 (time t100), the position of the first throat pipe 330 is switched from the first position to the second position. The supply of water to the toilet body 10 is stopped, and water injection to the tank 20 is started almost simultaneously.

  The water that is poured into the tank 20 and stored after the time t100 is the water that is supplied to the toilet body 10 at the next cleaning. As described above, it is necessary to supply 3.6 liters of water as flush water to the toilet body 10. Further, the toilet body 10 is supplied with four times as much water as the water jetted from the jet port 311. Therefore, after time t100, 2.7 liters (3/4 of 3.6 liters) of water needs to be stored in the tank 20.

  Even after time t100, the amount of water jetted from the jet nozzle 311 continues to be 20 liters / min. Therefore, in order to store 2.7 liters of water in the tank 20, it is necessary to inject water into the tank 20 for 8.1 seconds. In the present embodiment, the arrangement of the float 238 is adjusted so that the main valve 233 and the pilot valve 234 are closed when 8.1 seconds elapse from the time t100 (time t200).

  As described above, it takes 10.8 seconds (2.7 seconds + 8.1 seconds) from the start of water supply to the toilet body 10 to the end of water injection into the tank 20. It has become. Therefore, if the time until the cleaning is started again for the next user after the cleaning of the flush toilet apparatus FT is 10.8 seconds or longer, the water injection into the tank 20 is There is no hindrance to continuous use. Actually, the possibility that the cleaning of the toilet main body 10 is repeated in such a short time is extremely low.

  Thus, in flush toilet apparatus FT concerning this embodiment, since it is the composition which supplies water to toilet bowl main part 10 using a jet pump action, tank 20 is miniaturized. As a result, the time required for water injection into the tank 20 is short, and continuous cleaning is substantially possible.

  Next, the force acting on the first throat pipe 330 and the specific movement of the first throat pipe 330 due to this will be described. FIG. 10 is a graph showing how the water level stored in the tank 20 changes over time. Hereinafter, the state of water flowing through the throat pipe 320 at each time point, the state of the first throat pipe 330, and the like will be described with reference to FIGS. FIGS. 11 to 17 are diagrams schematically showing the internal state of the tank 20.

  As shown in FIG. 10, in the standby state before time t0 when the manual lever 236 is operated, the water level in the tank 20 is the full water level LVF. FIG. 11 schematically shows the internal state of the tank 20 at this time. As shown in FIG. 11, in the standby state, almost the entire first throat pipe 330 is submerged. No water is injected from the injection port 311 of the nozzle 310, and the water surface WS in the tank 20 is hardly waved.

  Gravity is acting on the first throat pipe 330. For this reason, a rotational force in a direction from the first position toward the second position acts on the first throat pipe 330. The entire float 380 fixed to the lower end of the first throat pipe 330 is submerged and receives buoyancy. Due to this buoyancy, a rotational force in the direction from the second position toward the first position is also acting on the first throat pipe 330. In this embodiment, it is comprised so that the rotational force by a buoyancy may become larger than the rotational force by gravity. Therefore, in the standby state shown in FIG. 11, the first throat pipe 330 is held at the first position by the buoyancy that the float 380 receives.

  When the manual lever 236 is operated at time t0, high-speed water is ejected from the ejection port 311 of the nozzle 310. FIG. 12 schematically shows the internal state of the tank 20 at this time. As shown in FIG. 12, since the first throat pipe 330 is held at the first position, the water jetted from the jet port 311 flows from the suction port 331 toward the inside of the first throat pipe 330. The water surface WS in the tank 20 is in a wavy state due to the influence of such a water flow.

  At this time, water stored in the tank 20 (water existing around the suction port 331) is discharged from the suction port 331 to the first throat pipe 330 by the flow of water sprayed from the injection port 311. It is drawn inside. Thereafter, the water rises inside the first throat pipe 330 together with the water jetted from the jet port 311 and flows toward the second throat pipe 350. As described above, the jet pump action is induced inside the first throat pipe 330, whereby water having a flow rate larger than the flow rate of the water jetted from the jet port 311 flows.

  First throat pipe 330 receives frictional force FF from a large flow of water flowing along the inner wall surface thereof. The frictional force FF is a force in a direction from the suction port 331 toward the bent portion 352 along the flow path direction of the first throat pipe 330. Further, the frictional force FF is applied substantially uniformly to the entire inner wall surface of the first throat pipe 330.

  As already described, the first throat pipe 330 is rotatable about a shaft 341 which is the upper end portion and disposed on the lower surface side as a central axis. When the friction force FF as described above is applied to the first throat pipe 330, the friction force FF acts as a rotational force that moves the first throat pipe 330 from the second position to the first position. It becomes. As a result, the rotational force due to the frictional force FF is added to the rotational force due to the buoyancy, so that the force to hold the first throat pipe 330 in the first position increases after time t0.

  Here, a state in which the water first rises in the first throat pipe 330 immediately after water starts to be ejected from the ejection port 311 will be described with reference to FIG. FIG. 13 schematically shows an internal state of the tank 20 immediately after water starts to be injected from the injection port 311. FIG. 13 shows a state in which the position and shape of the water surface (IS1 to IS6) existing in the throat pipe 320 change with time.

  When water begins to be ejected from the ejection port 311 at time t 0, the water due to the jet pump action moves inside the first throat pipe 330 at a high speed and moves toward the bent portion 352 of the second throat pipe 350. When the water reaches the bent portion 352, the surface of the water existing inside the throat pipe 320 moves toward the water conduit 130 while changing its position and shape in the order of IS1, IS2,... IS6 in FIG. Moving.

  As already described, in the bent portion 352, the flow path cross section becomes larger toward the downstream side, and the flow path direction is also changed. For this reason, the water that first reaches the bent portion 352 flows while decelerating while spreading along the cross section of the flow path when passing through the bent portion 352. As a result, as shown in IS1 to IS6 in FIG. 13, the water surface (also referred to as a gas-liquid interface) existing in the throat pipe 320 is downstream while always maintaining a substantially vertical state with respect to the flow path direction. Move to the side.

  For this reason, it is suppressed that the air which existed in the downstream rather than the water surface is caught in the upstream rather than the water surface. The water that has reached the bent part 352 from the first throat pipe 330 reaches the vertical part 351 and falls downward while moving as one water mass in the throat pipe 320. As a result, the siphon action is surely induced from the beginning inside the throat pipe 320, and a flow caused by the head of water stored in the tank 20 (flow using potential energy) is generated.

  Further, in the present embodiment, when viewed from a direction perpendicular to the central axis of the first throat pipe 330 and the central axis of the second throat pipe 350 (direction perpendicular to the paper surface of FIG. 13). , The curvature radius on the upper surface side of the bent portion 352 is larger than the curvature radius on the lower surface side of the bent portion 352. Since the bent portion 352 has such a shape, the water flowing upward through the first throat pipe 330 reaches the bent portion 352 and then smoothly flows along the upper surface side of the bent portion 352. Change direction. As a result, the water surface (gas-liquid interface) at the downstream end of the water flowing through the throat pipe 320 tends to be substantially perpendicular to the flow path direction. For this reason, it is possible to induce the siphon action more reliably.

  Thus, in this embodiment, the shape of the throat pipe 320 is devised to make good use of the flow velocity of water flowing by the jet pump action, and the siphon action starts immediately after water starts to be injected from the injection port 311. It is possible to trigger reliably. When the siphon action is induced, the water stored in the tank 20 is drawn into the first throat pipe 330 from the suction port 331 by both the jet pump action and the siphon action, and flows toward the rim portion 120. . Since both the jet pump action and the siphon action occur, water having a flow rate necessary for discharging the waste is supplied to the rim portion 120 (bowl portion 110).

  Returning to FIG. After time t0, the water stored in the tank 20 is drawn into the first throat pipe 330 and supplied to the rim portion 120 as described above. For this reason, the water level inside the tank 20 gradually decreases. FIG. 14 schematically shows a state inside the tank 20 when the water level inside the tank 20 gradually decreases (time t10 in FIG. 10).

  The water stored in the tank 20 is drawn into the first throat pipe 330 from the suction port 331 by both the jet pump action and the siphon action, and flows toward the rim portion 120. The water surface WS in the tank 20 is in a wavy state due to the influence of such a water flow. Even at time t10, the entire float 380 fixed to the lower end of the first throat pipe 330 is submerged. Therefore, the force applied to the first throat pipe 330 at time t10 is almost the same as the force applied in FIG. The first throat pipe 330 is held at the first position by the rotational force due to buoyancy and the rotational force due to the frictional force FF.

  By the way, the first throat pipe 330 is inclined with respect to the front-rear direction in the top view, and is also inclined with respect to the horizontal plane in the rear view. For this reason, in the limited space of the tank 20, the flow path length of the first throat pipe 330 is secured as long as possible. In other words, a straight flow path (a flow path on the upstream side of the bent portion 352) that is an upstream portion of the throat pipe 320 is secured as long as possible.

  For this reason, the flow of the water flowing in the first throat pipe 330 toward the second throat pipe 350 is made uniform in the flow velocity distribution in the cross section of the flow path until reaching the bent portion 352. As a result, when water reaches the bent portion 352, a flow that separates from the wall surface of the flow path or a vortex inside the bent portion 352 is suppressed. A decrease in jet pump performance due to the shape of the throat pipe 320 is suppressed, and a smooth water flow inside the throat pipe 320 is ensured.

  Returning to FIG. When the time further elapses from time t10 and the water level in the tank 20 falls, a part of the float 380 fixed to the lower end of the first throat pipe 330 appears on the water surface. Since the size of the buoyancy received by the float 380 is proportional to the volume of the submerged portion of the float 380, when a portion of the float 380 appears on the water surface, the size of the buoyancy decreases rapidly thereafter. Will be.

  When the magnitude of the buoyancy received by the float 380 is reduced, the force for holding the first throat pipe 330 in the first position is reduced, and is balanced with the rotational force due to gravity. For this reason, as the water level in the tank 20 decreases, the first throat pipe 330 moves by gravity from the first position to the second position (rotates about the shaft 341 as the rotation axis).

  When the first throat pipe 330 starts to move from the first position, the opening 332 and the opening 353 are separated from each other on the upper surface side of the throat pipe 320, and the first throat pipe 330 is located between the first throat pipe 330 and the second throat pipe 350. A gap is formed. That is, a gap is formed at a position higher than the suction port 331, and air is introduced into the throat pipe 320 from the gap. As a result, the water mass existing inside the throat pipe 320 is divided by the air, and the siphon action is stopped in a short time (may be almost simultaneous).

  FIG. 15 schematically shows an internal state of the tank 20 when the first throat pipe 330 moves to the second position (time t100 in FIG. 10). Even after the first throat pipe 330 moves to the second position, 20 liters / minute of water is continuously ejected from the ejection port 311 of the nozzle 310. As already described with reference to FIG. 6B, the water jetted in this state is not supplied to the inside of the first throat pipe 330 because the water jetted out from the suction port 331. For this reason, the jet pump action also stops at this point. Water ejected from the ejection port 311 is directed upward from the suction port 331 and supplied into the tank 20.

  An inclined surface 381 formed so as to rise from the upper surface of the first throat pipe 330 is formed in a portion of the float 380 located on the upper surface side of the first throat pipe 330 (see FIGS. 15 and 5). The inclined surface 381 is an inclined surface with respect to the central axis of the first throat pipe 330, and its width is slightly larger than the inner diameter of the injection port 311. As shown in FIG. 15, after the first throat pipe 330 has moved to the second position, the water injected from the injection port 311 hits the inclined surface 381 and changes its flow direction upward. The water hitting the inclined surface 381 falls after being directed upward, and is stored in the tank 20. The water surface WS in the tank 20 is in a wavy state due to the influence of such a drop of water. The water level in the tank 20 is the lowest at time t100, and thereafter rises.

  The inclined surface 381 of the float 380 receives a downward force when the water jetted from the jet port 311 hits it. In other words, the inclined surface 381 receives a downward force as a reaction caused by changing the flow direction of the water injected from the injection port 311 upward. As a result, a rotational force in a direction from the first position toward the second position is applied to the first throat pipe 330.

  The water level in the tank 20 at this time (time t100) will be described. The lower limit water level LV1 shown in FIG. 10 is a water level substantially the same as the height of the suction port 331 when the first throat pipe 330 is in the first position. In other words, the water level may cause air to flow from the suction port 331 into the first throat pipe 330.

  As shown in FIG. 10, when the position of the first throat pipe 330 is switched from the first position to the second position (time t100), the water level in the tank 20 is higher than the lower limit water level LV1 as described above. . It is configured such that a part of the float 380 appears on the water surface and the first throat pipe 330 moves to the second position before the water level in the tank 20 decreases and reaches the lower limit water level LV1. Has been.

  The jet pump action is stopped by the movement of the first throat pipe 330. Further, the siphon action is also stopped by introducing air from the gap between the first throat pipe 330 and the second throat pipe 350. For this reason, the water level in the tank 20 does not further decrease and reaches the lower limit water level LV1, and air does not flow in from the suction port 331. In this way, it is possible to prevent air from flowing in from the suction port 331 and generating noise from the tank 20 while the jet pump action and siphon action are occurring.

  FIG. 16 is a cross-sectional view showing the internal state of the tank 20 at time t100, and shows a cross section when the tank 20 is cut from a plane perpendicular to the left-right direction and viewed from the left side. As shown in FIG. 16, at time t <b> 100, the water in the tank 20 is stored only in the second tank unit 220. For this reason, the surface area of the water surface WS is smaller than when the water level is the full water level LVF. In other words, the shape of the tank 20 is such that the surface area of the water surface WS is reduced when the water level of the stored water is lowered to such a level that the jet pump operation is stopped and water injection into the tank 20 is started. It can be said that the shape is.

  When the surface area of the water surface WS is small, the amplitude of the wave generated on the water surface WS is small. For this reason, it is prevented that the height of the water surface WS fluctuates due to waves and air flows into the first throat pipe 330 from the suction port 331. In addition, since the magnitude of the buoyancy received by the float 380 is suppressed from being changed by waves, the timing at which the first throat pipe 330 moves from the first position to the second position changes as will be described later. It is suppressed.

  Returning to FIG. After time t100, water injected from the injection port 311 is stored in the tank 20, so that the water level in the tank 20 rises. FIG. 17 schematically shows the state inside the tank 20 when the water level inside the tank 20 is rising (time t110 in FIG. 10).

  As shown in FIG. 17, the entire float 380 fixed to the lower end of the first throat pipe 330 is submerged again. Since the float 380 receives the same buoyancy as that in the standby state shown in FIG. 11, the rotational force due to the buoyancy (force from the second position toward the first position) becomes the rotational force due to gravity (from the first position). It is larger than the force toward the second position.

  However, the water sprayed from the injection port 311 continues to hit the inclined surface 381, and the inclined surface 381 receives a downward force. For this reason, of the forces applied to the first throat pipe 330, the rotational force in the direction from the first position to the second position (the rotational force due to gravity and the force received by the inclined surface 381) is the second. It is larger than the rotational force in the direction from the position toward the first position (rotational force due to buoyancy). As a result, even after the entire float 380 is submerged, the first throat pipe 330 remains held at the second position.

  In this way, the water injected from the injection port 311 continues to be supplied into the tank 20 while the first throat pipe 330 is held at the second position. When the water level in the tank 20 rises and reaches the full water level LVF (time t200), the pilot valve 234 and the main valve 233 are closed as described above, and the jet pump unit 300 is connected from the water supply pipe 231. Water supply to is stopped. The injection of water from the injection port 311 is stopped, and the flush toilet apparatus FT enters a standby state.

  As described above, in the flush toilet apparatus FT according to the present embodiment, the first throat pipe 330 moves inside the tank 20, so that the supply destination of the water injected from the injection port 311 is from the water conduit 130. It is configured to be switched to the tank 20. That is, the throat pipe 320 itself functions as a movable valve for switching the flow path, and the first throat pipe 330 can be said to be a movable portion of the movable valve. A float 380 is connected to the first throat pipe 330, and the buoyancy received by the float 380 is used as part of the force for moving the movable part.

  As described above, in the flush toilet apparatus FT, the mechanical parts such as a valve for switching the water supply destination are not separately provided in the tank 20, and the water is discharged only by the minimum necessary members such as the throat pipe 320 and the nozzle 310. The supply destination is switched. For this reason, the tank 20 is further miniaturized. Further, by utilizing the buoyancy that the float 380 receives, an electric actuator is not necessary, and the configuration inside the tank 20 is further simplified.

  Subsequently, the balance of the force applied to the first throat pipe 330, the timing of the change, and the like will be described in more detail. FIG. 18 is a graph showing how the water level and the like of water stored in the tank 20 changes over time in a short period P (see FIG. 10) including the time t100. Of the plurality of graphs illustrated in FIG. 18, the graph G <b> 3 is a graph illustrating a change in the water level in the tank 20. Therefore, the graph G3 is an enlarged view of the portion in the period P in the graph shown in FIG.

  Graph G4 shows the magnitude of the rotational force (hereinafter also referred to as “first force”) in the direction of moving first throat pipe 330 from the second position to the first position among the forces applied to first throat pipe 330. It is a graph which shows the change of height. The first force can also be referred to as a force that holds the first throat pipe 330 in the first position.

  Graph G5 shows the magnitude of the rotational force (hereinafter also referred to as “second force”) in the direction of moving the first throat pipe 330 from the first position to the second position among the forces applied to the first throat pipe 330. It is a graph which shows the change of height. The second force can also be referred to as a force that holds the first throat pipe 330 in the second position.

  A waveform GW shown in FIG. 18 schematically shows how the amplitude and frequency of a wave generated on the water surface WS in the tank 20 change. For example, after time t100, the amplitude of the wave is larger than before that, indicating that the frequency is smaller.

  Hereinafter, the water level in the tank 20 at each time point, the change in the force applied to the first throat pipe 330, and the like will be described with reference to FIGS. FIGS. 19 to 24 are diagrams schematically showing the internal state of the tank 20.

  In the initial period (period before time t20 in FIG. 18) of the period P, the first throat pipe 330 is held at the first position. The water jetted from the jet port 311 of the nozzle 310 flows from the suction port 331 toward the inside of the first throat pipe 330. The water in the tank 20 is stored over both the first tank part 210 and the second tank part 220. For this reason, the surface area of the water surface WS is larger than that in the state shown in FIG. The entire float 380 fixed to the lower end of the first throat pipe 330 is submerged.

  Thereafter, when the water level in the tank 20 is further lowered to the water level LV2, the height of the water surface WS becomes equal to the height of the upper end of the float 380. This time is time t20. FIG. 19 schematically shows the internal state of the tank 20 at time t20. In FIG. 19, the second throat pipe 350 is not shown, and the shape and the like of the float 380 are also simplified. The same applies to FIGS.

  After time t20, as the water level in the tank 20 decreases, a part of the float 380 begins to appear on the water surface, and the magnitude of buoyancy received by the float 380 decreases. For this reason, as shown in FIG. 18, the first force (graph G4) is constant until time t20, but decreases after time t20.

  FIG. 20 schematically shows an internal state of the tank 20 when a little time has elapsed from the time t20 (a time point between the time t20 and the time t30). In the state illustrated in FIG. 20, the first force is still greater than the second force, although the first force is also decreasing as the buoyancy experienced by the float 380 is decreased. For this reason, the first throat pipe 330 remains held at the first position.

  When the water level in the tank 20 is further lowered and the first force is further lowered, the first force is balanced with the second force. Specifically, the first force obtained by adding the rotational force due to the frictional force FF to the rotational force due to the buoyancy received by the float 380 is balanced with the second force that is the rotational force due to gravity received by the first throat pipe 330. It becomes the state. The time at this time is set as time t30.

  At time t30, the force for holding the first throat pipe 330 in the first position (the force by which the opening 332 and the opening 353 are pressed against each other) is 0, and the first throat pipe 330 is in the float 380. Therefore, it is in an unstable state just floating on the water surface WS. That is, the position of the first throat pipe 330 is determined only by the height of the water surface WS.

  For this reason, after time t30, as the water level in the tank 20 decreases, the first throat pipe 330 also moves toward the second position. FIG. 21 schematically shows the internal state of the tank 20 when a little time has elapsed from time t30 (time point between time t30 and time t40). As shown in FIG. 21, the first throat pipe 330 has started to move toward the second position, and the upper inner wall surface of the first throat pipe 330 has a flow of water injected from the injection port 311 (hereinafter, “ It is also called "jet FL".

  When the upper inner wall surface of the first throat pipe 330 approaches the jet FL, a negative pressure is generated between them. The first throat pipe 330 receives a force directed to the second position by the negative pressure. Further, the magnitude of the negative pressure increases as the upper inner wall surface of the first throat pipe 330 approaches the jet FL. For this reason, as shown in FIG. 18, after time t30, the second force (graph G5) increases with time.

  In addition, since the opening 332 and the opening 353 start to be separated from each other after time t30, a gap is formed between the first throat pipe 330 and the second throat pipe 350, and the throat pipe 320 is inserted from the gap. Air is introduced. The flow caused by the siphon action that has occurred inside the throat pipe 320 suddenly decreases from time t30 and stops completely within a short period thereafter. After the time when the siphon action is stopped (time t40), the interior of the first throat pipe 330 is filled with air.

  In this way, the introduction of air into the throat pipe 320 is started at a time before the supply destination of the water injected from the injection port 311 is switched to the inside of the tank 20 (time t100). . The timing at which the siphon action actually stops (time t40) is later than the timing at which water injection into the tank 20 is started (time t100), and the water supplied to the tank 20 flows into the throat pipe 320 by the siphon action. It prevents the phenomenon of being sucked inside.

  After time t30, the rotational force due to the frictional force FF decreases as the flow rate of the water flowing through the first throat pipe 330 decreases as described above. Accordingly, the first force (graph G4) also decreases.

  Thus, at time t30, the second force (graph G5) increases and the first force (graph G4) decreases. Therefore, the first throat pipe 330 changes its position while accelerating toward the second position.

  In the middle of the movement of the first throat pipe 330 toward the second position, a part of the first throat pipe 330 (the edge of the suction port 331) hits the jet FL. In the present embodiment, the time at this time coincides with the time t40 when the siphon action stops. FIG. 22 schematically shows the internal state of the tank 20 at time t40. In the state shown in FIG. 22, since the jet flow FL hits the edge of the suction port 331, that is, the end surface of the first throat pipe 330 from below, the rotational force in the direction toward the first position is applied to the first throat pipe 330. Is added. In other words, a force that impedes the movement of the first throat pipe 330 trying to move to the second position is applied.

  However, immediately before time t40, the first throat pipe 330 has changed its position while accelerating toward the second position, and therefore continues to move toward the second position due to inertia even after time t40. As a result, the first throat pipe 330 immediately overcomes the state shown in FIG. 22 and shifts to a state where the upper surface of the first throat pipe 330 is positioned below the jet FL.

  FIG. 23 is an enlarged view of the vicinity of the suction port 331 in FIG. As shown in FIG. 23 and FIG. 5, a portion on the upper surface side of the first throat pipe 330 in the vicinity of the suction port 331 is cut obliquely with respect to the central axis of the first throat pipe 330. An inclined surface 335 is formed. By forming such an inclined surface 335, the width of the end surface of the first throat pipe 330 is narrowed on the upper surface side.

  Therefore, the force (the force that hinders the movement of the first throat pipe 330) caused by the jet FL hitting the end surface of the first throat pipe 330 from below is small. Further, after a little time has elapsed from the state shown in FIGS. 22 and 23, the jet FL hits the inclined surface 335, so that the first throat pipe 330 has a force in the direction from the first position to the second position. Will be added. That is, the second force increases. As a result, the first throat pipe 330 can more easily get over the state shown in FIG. 22, and the upper surface of the first throat pipe 330 is surely shifted to a state below the jet FL.

  As the jet FL hits the inclined surface 335 and the inclined surface 381, the second force (graph G5) increases rapidly immediately after time t40. On the other hand, since the water flow due to the siphon action is completely stopped at time t40, the rotational force due to the frictional force FF becomes zero. For this reason, as shown in FIG. 18, the first force (graph G4) decreases at time t40.

  As described above, after time t40, the second force (graph G5) increases rapidly, and the first force (graph G4) decreases. Accordingly, the first throat pipe 330 changes its position while further accelerating toward the second position, and reaches the second position in a short time (time t100). The state at this time is shown in FIG. FIG. 24 schematically shows the internal state of the tank 20 at time t100. As already described with reference to FIG. 15, the first throat pipe 330 is held at the second position by the jet FL hitting the inclined surface 381 of the float 380. In this state, water injected from the injection port 311 is supplied into the tank 20 and the water level in the tank 20 rises.

  As the water level rises, the buoyancy that the float 380 receives increases, so the first force also increases. Thereafter, the entire first float 380 is submerged in a short time, so that the first force is also constant. The time when the entire float 380 is submerged is defined as time t105. As shown in FIG. 18, after time t105, the second force (graph G5) is also constant, but the magnitude is larger than the first force (graph G4). For this reason, the first throat pipe 330 continues to be held at the second position until the water level in the tank 20 reaches the full water level LVF.

  As described above, in the flush toilet apparatus FT, as the water level in the tank 20 changes, the balance of the force applied to the first throat pipe 330 is changed well so that an appropriate and constant value can be obtained. The first throat pipe 330 is moved to the second position at the timing.

  Supplementing with reference to FIG. 18 again, when the water level in the tank 20 decreases to the water level LV2 at time t20, the rate of decrease of the first force (graph G4) thereafter increases. Specifically, the first force is constant until time t20, but rapidly decreases after time t20. For this reason, it immediately shifts to an unstable state in which the first force and the second force are balanced (time t30). After time t30, the movement toward the second position is induced by the vibration of the water surface WS in the tank 20 and the first throat pipe 330 is moved to the second position as a trigger. It is possible to make it.

  It is also conceivable that the first force is not reduced rapidly as described above, but slowly (for example, at a constant reduction rate) as the water level in the tank 20 decreases. However, in such a case, since the force for holding the first throat pipe 330 in the first position remains in the middle, it may happen that the first throat pipe 330 returns to the first position again. As a result, the supply destination of the water injected from the injection port 311 cannot be switched at an appropriate timing, so that excessive cleaning water is supplied to the rim portion 120 or air flows from the suction port 331. There is a possibility of noise.

  On the other hand, in the flush toilet apparatus FT, the first throat pipe 330 is returned to the first position as described above by increasing the decrease rate of the first force at time t20 and decreasing it at once. It is preventing that. As a result, it does not involve a state change that causes air to flow into the throat pipe 320, and does not use such a state change, and is appropriate based on only a change in the water level in the tank 20. At the timing, the water supply destination can be switched to the tank 20 side.

  Further, in the flush toilet apparatus FT, the first time from the time when the water level in the tank 20 drops to the water level LV2 (time t20) to the time when the first throat pipe 330 moves to the second position (time t100). The amount of decrease in the power is larger than the amount of decrease in the first force (in this embodiment, 0) while the water level in the tank 20 decreases from the full water level LVF to the water level LV2.

  When the water level in the tank 20 is lowered to the water level LV2, the first force is suddenly and greatly reduced, so that an unstable state in which the first force and the second force are balanced can be achieved in a short time. Transition. As a result, switching of the water supply destination at an appropriate timing (movement of the first throat pipe 330 to the second position) is more reliably performed.

  Further, in the flush toilet apparatus FT, in the period from the time when the water level in the tank 20 drops to the water level LV2 (time t20) to the time when the first throat pipe 330 moves to the second position (time t100), The first force decreasing rate in the initial period (period up to time t30) of the period is larger than the first force decreasing speed in the end period (period after time t30). By providing a period during which the first force is greatly reduced and then gradually reduced, vibration (hunting) is prevented from occurring in the movement of the first throat pipe 330. As a result, the movement of the first throat pipe 330 is performed at a more accurate timing.

  Here, the absolute value of the ratio of the change amount of the buoyancy received by the float 380 to the change amount of the water level stored in the tank 20 is defined as “buoyancy change rate”. In other words, the absolute value of the value obtained by dividing the amount of change in the buoyancy received by the float by the amount of change in the water level stored in the tank is defined as the “buoyancy change rate”.

  In the flush toilet apparatus FT, the buoyancy change rate after time t20 is larger than the buoyancy change rate before time t20 (which is 0 in this embodiment). In other words, the buoyancy change rate when the first throat pipe 330 is moved from the first position using the change in buoyancy is larger than the buoyancy change rate until then. Since the magnitude of the buoyancy received by the float 380 is abruptly changed at an appropriate timing at which the first throat pipe 330 should be moved from the first position to the second position, the first throat pipe 330 is further reliably moved. .

  Further, in the flush toilet apparatus FT, when the water level in the tank 20 drops to the water level LV2 and a part of the float 380 begins to appear on the water surface (time t20), the water in the tank 20 becomes the second tank. It is comprised so that it may be in the state currently stored only in the part 220. FIG. For this reason, as shown in the graph G3 of FIG. 18, after the time t20, the decreasing speed of the water surface becomes large. As a result, the decrease rate of the first force after time t20 is further increased, and the first throat pipe 330 is moved more smoothly and reliably.

  In the flush toilet apparatus FT, the float 380 and the first throat pipe 330 are moved by the change of the water level in the tank 20. For this reason, when the water level fluctuates due to undulation of the water surface WS, the timing at which the first throat pipe 330 moves from the first position to the second position fluctuates. In particular, the timing (time t30) at which the first throat pipe 330 is in an unstable state that only floats on the water surface WS due to the float 380 is likely to fluctuate, and this changes the timing at which the first throat pipe 330 moves. It is possible to end up.

  However, in the flush toilet apparatus FT, when a part of the float 380 begins to appear on the water surface (time t20), the water in the tank 20 is stored only in the second tank unit 220, and the water surface WS Is configured to have a small surface area. With such a configuration, after time t20, the amplitude of the wave generated on the water surface WS becomes small, so the buoyancy received by the float 380 is stabilized. Further, since the frequency of the wave generated on the water surface WS is increased, the float 380 and the first throat pipe 330 cannot move following it. As a result, fluctuations in the position of the first throat pipe 330 are further suppressed, and fluctuations in the timing at which the first throat pipe 330 moves are also suppressed.

  Further, as shown in FIGS. 4 and 5, the float 380 is disposed so as to surround the suction port 331. For this reason, the amplitude of the wave generated on the water surface WS in the tank 20 is reduced by hitting the float 380. As a result, fluctuations in the position of the first throat pipe 330 are further suppressed.

  In FIG. 18, since fluctuations in timing appearing at times t <b> 30, t <b> 40, t <b> 100 are suppressed, the amount of water supplied to the rim 120 is fluctuated and the water level in the tank 20 is excessively lowered. As a result, the generation of noise due to the suction of air from the suction port 331 is suppressed.

  In the flush toilet apparatus FT, various devices are made in order to suppress waves generated particularly in the vicinity of the suction port 331 in the water surface WS in the tank 20.

  As shown in FIG. 2, the suction port 331 is disposed in the vicinity of the rear side and the right side corner (the corner in the top view) of the second tank unit 220. A suction port 331 is disposed in the vicinity of the corner, which is the portion where waves are most easily attenuated, near the rear and right wall surfaces.

  A part of the nozzle 310 is disposed between the rear side wall surface 216 of the second tank portion 220 and the suction port 331, and the float 380 is disposed between the right side wall surface 215 of the second tank portion 220 and the suction port 331. A part of is arranged. With such a configuration, the wave generated inside the second tank unit 220 is further attenuated by the float 380 or the nozzle 310 before reaching the suction port 331.

  With the above-described devices, waves generated in the vicinity of the suction port 331 are suppressed. For this reason, even if the tank 20 is downsized and the water level after time t30 is close to (slightly above) the suction port 331, the water surface WS undulates and air flows from the suction port 331 to the first throat. It is prevented that it flows into the pipe 330.

  Further, in the state where the first throat pipe 330 is in the first position, the suction port 331 is formed so that the entire edge thereof is along the horizontal plane. By forming the suction port 331 in this way, the water level stored in the tank 20 is changed in the vicinity of the suction port 331 while preventing air from flowing into the throat pipe 320 from the suction port 331. It is possible to reduce it to. Since the water stored in the tank 20 is used without waste, the tank 20 can be further downsized.

  FIG. 25 is a diagram schematically illustrating a state in which water jetted from the nozzle 310 hits a part (the inclined surface 381) of the float 380 at time t100. At time t100, the first throat pipe 330 has just moved to the second position, and the water level in the tank 20 is in the lowest state. At this time, the water jetted from the nozzle 310 hits the inclined surface 381 of the float 380 and scatters while spreading upward as indicated by the arrow AR7. The scattered water does not concentrate in the vicinity of the suction port 331 and falls, but falls on the entire water surface in the tank 20. As a result, the water surface in the vicinity of the suction port 331 is not greatly undulated, and the inflow of air from the suction port 331 into the throat pipe 320 is further suppressed.

  By the way, in the state shown in FIG. 14, that is, in the state where the first throat pipe 330 is in the first position, the traveling direction of the water jetted from the nozzle 310 is the same as the direction of the central axis of the first throat pipe 330. I'm doing it. For this reason, since the jetted water should flow along the inner wall surface of the first throat pipe 330, the first throat pipe 330 is not subjected to a force due to the water jetted from the nozzle 310 hitting the inner wall surface. There should be no.

  However, even in the case of such a design, the traveling direction of the water jetted from the nozzle 310 is in fact centered on the central axis of the first throat pipe 330 due to an error in the part shape or an error generated during assembly. On the other hand, it may become non-parallel.

  In this case, the direction in which the error occurs (the direction in which the traveling direction of the water jetted from the nozzle 310 is inclined with respect to the central axis of the first throat pipe 330) is random. Therefore, for example, there may be a force that holds the first throat pipe 330 in the first position, or a force that biases the first throat portion toward the second position. In some cases. As a result, there is a possibility that the timing at which the flow path is switched varies greatly from product to product.

  In order to prevent this, in the state where the first throat pipe 330 is stopped at the first position, the traveling direction of the water jetted from the nozzle 310 is not parallel to the central axis of the first throat pipe 330. It is good also as a structure (design) which becomes. That is, the traveling direction of the water sprayed from the nozzle 310 may be configured to intentionally incline toward a predetermined direction instead of being parallel to the central axis of the first throat pipe 330. For this reason, although the magnitude of the force acting on the first throat pipe 330 may fluctuate due to an error in part shape or an error generated during assembly, the direction of the force (the central axis of the first throat pipe 330 is changed). There is no such thing as flipping. As a result, it is possible to prevent the timing at which the flow path is switched from changing greatly due to an error for each product.

  Further, in the state where the first throat pipe 330 is stopped at the first position, the traveling direction of the water sprayed from the nozzle 310 is non-parallel to the central axis of the first throat pipe 330 and is on the moving surface. You may comprise so that it may become parallel with respect to. The moving surface is a plane including both the central axis of the first throat pipe 330 at the first position and the central axis of the first throat pipe 330 at the second position. In other words, when the first throat pipe 330 moves between the first position and the second position, the plane includes a trajectory through which the central axis of the first throat pipe 330 passes.

  With such a configuration, when the first throat pipe 330 is stopped at the first position, the first throat pipe 330 has a force in a direction from the first position toward the second position, or from the second position to the second position. One of the forces in the direction toward one position is received by the flow of water ejected from the nozzle 310. Therefore, the force received by the first throat pipe 330 can be efficiently and stably used as a force for holding the first throat pipe 330 at the first position or the second position. Become.

  Further, in a state where the first throat pipe 330 is stopped at the first position, the traveling direction of the water sprayed from the nozzle 310 is prevented from moving from the first position to the second position. It may be a different direction. The force in such a direction as to suppress the first throat pipe 330 from moving from the first position to the second position when the water jetted from the nozzle 310 moves toward the inner wall surface on the upper side of the first throat pipe 330. Receive.

  With such a configuration, when the first throat pipe 330 is stopped at the first position, the first throat pipe 330 is forced to be held at the first position by the flow of water jetted from the nozzle 310. receive. Even if the buoyancy acting on the first throat pipe 330 fluctuates due to the undulation of the water surface of the water stored in the tank, the first throat pipe 330 is stably placed at the first position. Will be held.

  Next, the flow rate of water supplied to the rim portion 120 through the water conduit 130 will be described in detail. The flush toilet apparatus FT causes water to flow down from the entire rim portion 120 toward the bowl portion 110 while flowing water so as to turn along the rim portion 120. Therefore, if the flow rate of the water supplied to the rim portion 120 becomes small, the supplied water flows down to the bowl portion 110 before the entire rim portion 120 can be swung, and the bowl portion 110 May not be cleaned.

  Further, the flush toilet apparatus FT is of a type (washing-out type) in which filth is pushed out toward the drain pipe SW with water supplied from the tank 20. Accordingly, if the flow rate of water becomes too small or too large, the filth may not be discharged to the drain pipe SW or it may take time to be discharged. For this reason, it is necessary to supply water to the rim part 120 (bowl part 110) at a constant and appropriate flow rate.

  Considering the above points, the flush toilet apparatus FT is configured such that the flow rate of water supplied as flush water to the toilet body 10 is 80 liters / minute (see FIG. 9). However, as in the flush toilet apparatus FT, the flow of the water stored in the tank 20 due to the head of the water (flow using potential energy, which is generated by the siphon action in this embodiment) is used. In a flush toilet apparatus, it is actually not easy to supply water at a constant flow rate as shown by the graph G1 in FIG.

  Immediately after time t0, since the water level in the tank 20 is close to the full water level LVF, the water head is in the highest state, and the flow rate of water supplied to the rim portion 120 tends to increase due to siphon action. On the other hand, when the water level in the tank 20 decreases with time, the water head is in a low state, and the flow rate of water supplied to the rim portion 120 by the siphon action tends to be small.

  Therefore, in the flush toilet apparatus FT, the amount of water supplied as washing water to the rim portion 120 (the bowl portion 110) is reduced by appropriately generating the flow of water due to the jet pump action together with the flow of water due to the siphon action. Constant and appropriate.

  FIG. 26 is a graph showing a change in the flow rate of water supplied from the tank 20 to the rim portion 120, and a period during which 80 liters / minute of water is supplied to the rim portion 120 (from immediately after time t0). , A change in flow rate during a period until time t40). Of the plurality of graphs shown in FIG. 26, a graph G6 shows a change in the flow rate of the whole water supplied to the rim portion 120 through the water conduit 130. A graph G7 shows a change in the flow rate of water ejected from the ejection port 311 of the nozzle 310. The graph G8 is a flow by the head of water stored in the tank 20 among the water supplied to the rim portion 120 through the water conduit 130 (flow using potential energy, and in the present embodiment, by siphon action). It shows the change in flow rate). Graph G9 shows a change in the flow rate of the flow due to the jet pump action in the water supplied to the rim portion 120 through the water conduit 130.

  As described with reference to FIG. 13, when injection of water from the injection port 311 is started at time t <b> 0, the siphon action is induced almost simultaneously with the jet pump action being induced. For this reason, a flow due to the jet pump action (hereinafter also referred to as “JP flow”) and a flow due to the head of water stored in the tank 20 (hereinafter also referred to as “water head flow”) occur almost simultaneously.

  Since the water head is high immediately after time t0, the flow rate of the water head flow (graph G8) is large as shown in FIG. On the other hand, at this time, water is jetted from the jet port 311 toward the suction port 331, but the JP flow is suppressed by the large flow head flow, and the flow rate is smaller than the head flow. That is, immediately after time t0, the head flow is more dominant than the JP flow.

  Thereafter, the water level in the tank 20 decreases with the passage of time, and the water head also decreases. As a result, the water head flow rate gradually decreases. When the flow rate of the water head flow decreases, the flow rate of the JP flow that has been suppressed by this gradually increases. The flow rate of the JP flow and the flow rate of the head flow are substantially equal to each other at time t1, and thereafter the JP flow shifts to a more dominant state. Time t1 is a time approximately halfway between time t0 and time t40.

  As described above, the head flow decreases with the passage of time, but the JP flow increases so as to compensate for it. For this reason, in the whole period when water is supplied to the rim part 120, the flow rate of the whole water supplied to the rim part 120 through the water conduit 130 is substantially constant (80 liters / minute). .

  As described above, in the flush toilet apparatus FT, the flow rate of water supplied to the rim portion 120 is changed by switching from the state where the head flow is more dominant to the state where the JP flow is more dominant. It is comprised so that it may become substantially constant. For this reason, in the flush toilet bowl device FT, the flow rate of the wash water supplied to the bowl portion 110 can be set to a constant and appropriate flow rate, and filth can be reliably discharged to the drain pipe SW. It has become.

  Moreover, since the siphon action has been generated from the beginning, the interior of the throat pipe 320 is filled with water at time t1. For this reason, when shifting to a state in which the JP flow is more dominant in the period after time t1, the transition is performed continuously and stably. As a result, even when shifting to a state where the JP flow is more dominant, the flow rate of the cleaning water supplied to the bowl portion 110 is maintained at a constant and appropriate flow rate.

  Further, since the siphon action is induced immediately after water starts to be ejected from the nozzle at time t0, water at a constant and appropriate flow rate is made into the bowl portion 110 almost simultaneously. Since the siphon action is induced by the water ejected from the ejection port 311, a special mechanism for generating the siphon action is not required. Furthermore, the flow rate of water ejected from the ejection port 311 is always 20 liters / minute and is constant. For this reason, when it transfers to the state where the direction of JP flow is dominant, it is suppressed that the flow volume of the water supplied to the bowl part 110 changes discontinuously.

  Further, the flow rate of the JP flow is configured to gradually (continuously) increase with time. For this reason, it is possible to make the flow rate of the water supplied to the rim part 120 through the water conduit 130 substantially constant throughout the period from immediately after time t0 to time t40. In other words, it is possible to reliably prevent the flow rate of water turning around the rim portion 120 from becoming too large or too small over the entire period.

  By the way, of the water flow supplied from the tank 20 to the water conduit 130, the water flow (JP flow) supplied to the water conduit 130 by the action of the jet pump is relatively turbulent by the injection from the injection port 311. It has become a flow. For this reason, when turning and flowing along the rim part 120, water may be scattered around the flush toilet apparatus FT due to the disturbance. On the other hand, since the water flow (water head flow) supplied to the water guide channel 130 by the water head stored in the tank 20 is a relatively small flow, the water flows when swirling along the rim 120. The possibility of splattering is small.

  Therefore, in the flush toilet apparatus FT, the head flow is dominant in the first half of the period (a period from time t0 to time t1) in which the water head flow with less turbulence can be used effectively. It is configured. With such a configuration, the phenomenon that water scatters around the flush toilet apparatus FT is reliably prevented.

  For the purpose of making the flow rate of water supplied to the rim portion 120 closer to a constant value, a mechanism for changing the flow rate of water injected from the injection port 311 of the nozzle 310 may be further provided. For example, as such a mechanism, an electric flow rate adjusting valve is provided between the main valve 233 and the vacuum breaker 235, and is electrically controlled so that the flow rate of water supplied to the nozzle 310 gradually increases. It is good also as such a structure. By providing such a mechanism, it is possible to more appropriately adjust the JP flow in a period from immediately after time t0 to time t40.

  Further, for the purpose of making the flow rate of the water supplied to the rim portion 120 closer to a constant value, a mechanism for changing the water flow resistance received by the water jetted from the jet port 311 of the nozzle 310 may be further provided. . For example, as such a mechanism, an electric baffle plate is disposed on the downstream side of the ejection port 311 (between the ejection port 311 and the suction port 331), and the water directly hits the baffle plate among the ejected water. It is good also as a structure which controls the position, angle, etc. of a baffle plate so that the amount of water may decrease gradually (water flow resistance decreases gradually). By providing such a mechanism, it is possible to more appropriately adjust the JP flow in a period from immediately after time t0 to time t40.

  The other structure of the flush toilet apparatus FT is demonstrated. As shown in FIG. 4, in the present embodiment, the bottom wall 211 of the first tank portion 210 (the portion on the front side of the second tank portion 220) is horizontal. It may replace with such an aspect and may incline so that the bottom wall 211 (upper surface) may go down toward a 2nd tank part. In this case, in the process in which the water level stored in the tank 20 is decreasing, the water existing in the first tank part 210 flows into the second tank part 220 smoothly and reliably. It will be. Since water stays on the upper surface of the bottom wall 211 and the water surface WS is prevented from lowering below the suction port 331, air flows into the throat pipe 320 from the suction port 331. It is possible to further suppress the generation of noise due to.

  When water intrudes between the first throat pipe 330 and the second throat pipe 350 and they are in close contact with each other, the first throat pipe 330 is held at the first position by the surface tension of the water. there is a possibility. In this case, the first throat pipe 330 may not move at an appropriate timing. Therefore, in order to prevent such a phenomenon, at least one of the end surface on the opening 332 side of the first throat pipe 330 and the end surface on the opening 353 side of the second throat pipe 350 is roughened. It may be left.

  Next, a phenomenon called “water surface fall” that occurs on the water surface WS in the tank 20 will be described. FIG. 27 is a diagram for explaining a water surface fall, and is a diagram schematically showing a state in the tank 20 when the water surface WS is lowered to the vicinity of the suction port 331. In the state shown in FIG. 27, the first throat pipe 330 is in the first position, and the water in the tank 20 is sucked into the first throat pipe 330.

  When water is sucked into the first throat pipe 330, the water stored in the tank 20 flows from the surroundings in the vicinity of the suction port 331 so as to supplement the sucked water. However, in a state where the water surface WS is lowered to the vicinity of the suction port 331, the inflow of water from the vicinity toward the vicinity of the suction port 331 may be insufficient. In particular, in a portion where the wall W of the tank 20 and the first throat pipe 330 are close to each other (portion indicated by reference numeral CS), the inflow of water is likely to be insufficient. In this case, as shown in FIG. 27, the portion of the water surface WS in the vicinity of the suction port is locally lower than the other portions and falls. Hereinafter, such a phenomenon is referred to as “water surface fall”.

  When the water level falls, air flows into the suction port 331 at a time when the (total) water level in the tank 20 is higher than the suction port 331, and the performance of the jet pump may be deteriorated. In other words, part of the water stored in the tank 20 may not be effectively used as cleaning water. In the flush toilet apparatus FT that reduces the size of the tank 20 to save water and performs cleaning with a minimum amount of water, when such a performance deterioration of the jet pump occurs, the cleaning performance is insufficient and the waste cannot be discharged. May end up.

  FIG. 28 shows a part of the tank 20 (in the vicinity of the suction port 331) in a top view, and the first throat pipe 330 is arranged such that its central axis CA is along the front-rear direction (tank 20 shows a part in the tank 20 in the case where the first throat pipe 330 is arranged so that the central axis CA is perpendicular to the 20 walls W.

  In order to efficiently generate the jet pump action, it is preferable to secure a long flow path length in the upstream portion of the throat pipe 320, that is, in a substantially linear portion including the first throat pipe 330. For this reason, when the first throat pipe 330 is arranged as shown in FIG. 28 while securing the flow path length long, the suction port 331 and the wall W (rear side wall surface 216) of the tank 20 are arranged. The distance becomes smaller. As a result, a region RW1 is formed between the suction port 331 and the wall W of the tank 20 in the water surface WS in the tank, where water does not easily flow from the surroundings and the water surface is liable to fall.

  Such a region RW1 is a relatively wide range extending in the left-right direction. Further, when the water surface WS undulates, the range of the region RW1 also varies due to the influence. In order to prevent the water surface from falling, it is conceivable to take measures such as promoting the inflow of water toward the region RW1. However, when the range of the position where the water surface can fall is wide and fluctuates as described above, a measure for preventing the water surface from falling is unavoidable. As a result, the tank 20 is increased in size.

  In contrast, in the flush toilet apparatus FT according to the present embodiment, the central axis CA of the first throat pipe 330 is inclined with respect to the front-rear direction in a top view. FIG. 29 is a view for explaining a water surface fall that occurs on the water surface WS of the tank 20, and schematically shows the arrangement of the throat pipe 320 inside the tank 20 in a top view.

  As shown in FIG. 29, the suction port 331 that is the end of the throat pipe 320 is disposed in the vicinity of the first corner C <b> 1 that is a portion that becomes a rear corner in the top view of the inside of the tank 20. Yes. That is, the suction port 331 is disposed at a position in the tank 20 so as to be close to both the rear wall surface 216 and the right wall surface 215.

  By arranging the suction port 331 at such a position, portions of the water surface WS in the tank 20 in the vicinity of the first corner C1 are the rear side wall surface 216, the right side wall surface 215, and the throat pipe 320 of the tank 20. Surrounded by For this reason, it is relatively difficult for water to flow into the first corner C1, and the water surface is likely to fall. In other words, the flush toilet apparatus FT has a configuration in which the range in which the water level can fall is limited to a relatively narrow range (region RW2) in the vicinity of the first corner C1 and a small fluctuation in the water surface WS. It has become.

  Further, in the flush toilet apparatus FT, the portion of the throat pipe 320 on the suction port 331 side is disposed inside the tank 20 in an inclined state in both a top view and a side view. Specifically, in a side view, the portion is inclined so as to descend toward the suction port 331. Further, in a top view, the portion is inclined with respect to the front-rear direction.

  Since the throat pipe 320 is arranged in the tank 20 in such a state, the water flowing toward the throat pipe 320 when the water level in the tank 20 decreases, as indicated by the arrow AR8, the throat pipe 320. Will flow toward the region RW2 while being guided along the outer surface of the. Moreover, the water that has run on the upper surface of the first throat pipe 330 also flows into the region RW2 along the inclined upper surface. As a result, since a sufficient amount of water flows from the periphery toward the region RW2, which is a region where the water surface can fall, the occurrence of the water surface falling is suppressed.

  As described above, in the flush toilet apparatus FT, the range in which the water surface can fall is limited to the relatively narrow area RW2 near the first corner C1, and water flows into the area RW2. By adopting an easy-to-use structure, the occurrence of water surface fall is suppressed. As a result, while the tank 20 is downsized, the performance of the jet pump unit 300 is prevented from being deteriorated due to the water surface falling.

  Since the deterioration of the performance of the jet pump unit 300 is prevented as described above, substantially the entire water stored in the tank 20 can be effectively used as cleaning water. As a result, there is no need to secure a space for storing useless water inside the tank 20, and the tank 20 is further downsized.

  By the way, in the water stored inside the tank 20, the region 280 that is a portion on the front side (right side) of the central axis CA of the first throat pipe 330 in the top view and the first throat pipe 330 in the top view. There is a region 290 which is a portion on the rear side (left side) with respect to the central axis CA. Of these, the region 280 is a relatively narrow region, and is also a region where the water depth is relatively shallow, as is apparent from FIG. On the other hand, the region 290 is a relatively wide region, and is also a region where the water depth is relatively deep as apparent from FIG.

  For this reason, water tends to flow from the region 290 toward the first corner C1, whereas water hardly flows from the region 280 toward the first corner C1. As a result, the flow of water toward the first corner C1 may be biased, which may cause a water surface fall in the vicinity of the suction port 331 (region RW2).

  Therefore, in the flush toilet apparatus FT, the flow of water toward the first corner C1 is made uniform by devising the angle of the central axis CA with respect to the wall surface of the tank. Specifically, when viewed from above, the angle θ2 formed by the center axis CA with respect to the right wall surface 215 is larger than the angle θ1 formed by the center axis CA with respect to the rear side wall surface 216. . With such an arrangement, the flow of water in the region 290 on the rear side (left side) of the throat pipe 320 toward the first corner C1 is suppressed, while the region on the front side (right side) of the throat pipe 320 is suppressed. The flow of water present at 280 toward the first corner C1 is promoted. As a result, the flow of water toward the first corner C1 is made uniform throughout the tank 20, and the occurrence of a water surface fall is further suppressed.

  The normal line of the plane (virtual plane) along which the edge of the suction port 331 extends is inclined with respect to the central axis CA. In other words, the first throat pipe 330 has a shape that is cut obliquely with respect to the central axis CA, and a portion corresponding to the cut surface is the suction port 331. As a result, as shown in FIG. 4 and the like, the first throat pipe 330 has a length on the upper surface side along the direction of the central axis CA rather than a length on the lower surface side along the direction of the central axis CA. Is long. For this reason, compared with the case where the normal line of the plane along which the edge of the suction port 331 extends is parallel to the central axis CA, the angle formed by the plane along the edge of the suction port 331 with respect to the horizontal plane is small. Such a shape of the first throat pipe 330 can be said to be a shape in which a portion on the first corner C1 side of the edge of the suction port 331 is extended downward (along the central axis CA). .

  As a result, air does not enter the throat pipe 320 from the suction port 331 to the extent that a small water surface fall has occurred in the region RW2. In this way, the deterioration of the performance of the jet pump unit 300 due to the water surface fall is further suppressed with a simple configuration.

  As described with reference to FIG. 5 and the like, the float 380 is fixed to the lower end portion of the first throat pipe 330 with the bolt B so as to surround the periphery (side surface) of the suction port 331 (in FIG. 29). Not shown). Due to the presence of the float 380 around the suction port 331, the water flowing along the arrow AR 8 when the water level in the tank 20 is lowered is guided along the outer surface of the first throat pipe 330, and the float 380. The air flows toward the region RW2 while being guided by the surface. Specifically, the water flows along the outer surface of the first throat pipe 330 toward the first corner C1, and then flows along the upper surface of the float 380 to reach the region RW2. That is, it flows near the water surface WS and reaches the region RW2. As a result, more water flows into the region RW2 from the surroundings (concentration), so that the occurrence of a water surface fall is further suppressed.

  As shown in FIG. 4, the float 238 connected to the small tank 260, the water supply pipe 231, and the pilot valve 234 are all arranged in a portion on the left side of the inside of the tank 20. In other words, the inside of the tank is disposed at a portion on the opposite side to the side (right side) where the suction port 331 is disposed in the left-right direction. Therefore, the flow of water toward the suction port 331 is not hindered by these, and water smoothly flows from the surroundings into the region RW2. As a result, the occurrence of a water surface fall when the water level in the tank 20 decreases is further suppressed.

  Next, various ideas for realizing the miniaturization of the tank 20 will be described. In the flush toilet apparatus FT, a portion of the throat pipe 320 on the suction port 331 side (first throat pipe 330) is disposed inside the tank 20 in an inclined state in both a top view and a side view. Specifically, in a side view, the portion is inclined so as to descend toward the suction port 331. Further, in a top view, the portion is inclined with respect to the front-rear direction.

  By arranging the throat pipe 320 in the tank in such a state, a (substantially linear) flow path length necessary to efficiently generate the jet pump action is ensured without increasing the size of the tank 20. doing. Thus, in flush toilet apparatus FT, the tank is miniaturized without sacrificing the performance of jet pump unit 300 by devising the arrangement of throat pipe 320.

  FIG. 30 is a top view showing the positional relationship between the suction port 331 and the toilet body 10, and schematically shows the arrangement of the throat pipe 320 inside the tank 20 in a top view. In FIG. 30, a group of devices including a water supply pipe 231, a constant flow valve 232, a main valve 233, a pilot valve 234, and a vacuum breaker 235 are indicated by reference numeral VU. Below, these are demonstrated as the valve unit VU.

  As illustrated in FIG. 30, the suction port 331 is disposed at a position that does not overlap with the toilet body 10 in a top view. The nozzle 310 (not shown in FIG. 30) and the bottom wall 221 of the second tank part 220 exist below the suction port 331, but the toilet main body 10 does not exist further below. For this reason, the shape of the lower part of the nozzle in the bottom wall 221 is not restricted for the toilet body 10, and it is possible to obtain an appropriate shape for arranging the nozzle 310. For example, in the present embodiment, a part of the tank 20 is extended downward so that the bottom wall 221 is positioned lower than the upper surface 101 of the toilet body 10. In this way, the nozzle 310 is arranged with a wide space between the suction port 331 and the bottom wall 221 without increasing the upper end position of the tank 20. As a result, the enlargement of the tank 20 is suppressed. Further, the flow path length of the first throat pipe 330 is ensured by arranging the lower end (suction port 331) of the first throat pipe 330 inside the second tank portion 220. Such a configuration also improves the performance of the jet pump unit 300.

  As shown in FIG. 30, the valve unit VU includes a space on the opposite side (left side) to the side (right side) where the suction port 331 is arranged in the left-right direction in the tank 20, and the second throat pipe 350. It is arrange | positioned over the space of the back side. In other words, the throat pipe 320 is arranged so as to be inclined when viewed from above, and the space that is widely vacant (the space on the rear side of the second throat pipe 350) is effectively used, and at a position that does not interfere with the suction port 331. A valve unit VU is arranged. For this reason, the enlargement of the tank 20 is suppressed while the valve unit VU is disposed in the tank 20.

  As described with reference to FIG. 4, the small tank 260 is arranged at the front and left corner of the first tank unit 210. In other words, the inside of the tank 20 is arranged at a portion on the opposite side (left side) to the side (right side) where the suction port 331 is arranged in the left-right direction. Further, the small tank 260 and the valve unit VU (the main valve 233 and the like) are arranged along the front-rear direction. The small tank 260 and the valve unit VU are arranged while effectively using the space in the tank 20 other than the portion occupied by the throat pipe 320. For this reason, the enlargement of the tank 20 is suppressed while arranging these in the tank.

  As described with reference to FIG. 4, the transmission mechanism 237 is disposed inside the tank 20. The transmission mechanism 237 is disposed above the first throat pipe 330 in the tank 20. In other words, the space formed by arranging the first throat pipe 330 in an inclined state with respect to the horizontal plane is effectively used as a space for arranging the transmission mechanism 237. For this reason, while the transmission mechanism 237 is disposed in the tank 20, an increase in size of the tank 20 due to this is suppressed.

  Subsequently, a flush toilet apparatus FTa according to a second embodiment of the present invention will be described. The flush toilet apparatus FTa differs from the flush toilet apparatus FT in the shape of the throat pipe 320. FIG. 31 is a diagram for explaining the shape of the throat pipe 320a, and schematically shows the arrangement of the throat pipe 320a inside the tank 20 in a top view.

  As shown in FIG. 31, the throat pipe 320a has a shape in which its central axis is smoothly curved in a top view so as to ensure a wide space in which the valve unit VU is arranged. Specifically, when viewed from above, the angle formed between the central axis of the throat pipe 320a and the left-right direction gradually decreases from the suction port 331a side to the second throat pipe 350a side. .

  Compared to the case where the central axis of the throat pipe 320a is linear in a top view, a space in which the valve unit VU is disposed (a space behind the second throat pipe 350a) is secured. For this reason, it is not necessary to downsize the valve unit VU, and the cost for downsizing can be suppressed. Further, as apparent from a comparison between FIG. 30 and FIG. 31, the valve unit VU can be arranged on the center side in the left-right direction by curving the throat pipe 320a. For this reason, the tank 20 can be further reduced in size by reducing the size of the tank 20 in the left-right direction.

  It should be noted that the curvature of the curved throat pipe 320a is sufficient to ensure a space in which the valve unit VU is disposed. For this reason, the jet pump performance does not deteriorate due to the shape of the throat pipe 320a.

  Subsequently, a flush toilet apparatus FTb according to a third embodiment of the present invention will be described. The flush toilet apparatus FTb differs from the flush toilet apparatus FT in the shape of the throat pipe 320. FIG. 32 is a view for explaining the shape of the throat pipe 320b, and schematically shows the arrangement of the throat pipe 320b inside the tank 20 in a top view.

  As shown in FIG. 32, when viewed from above, the angle formed by the central axis of the throat pipe 320b and the left-right direction is arranged to be smaller than the angle formed by the central axis of the throat pipe 320 and the left-right direction. ing. As a result, the throat is such that the position (P1) of the front end of the suction port 331b is on the front side (lower side in FIG. 32) than the position (P2) of the rear end of the inlet 131 of the water conduit 130. A tube 320b is disposed. Such an arrangement can be said to be partially overlapped with the position of the inlet 131 and the position of the suction port 331b when viewed from the side. By arranging the throat pipe 320b in this way, the dimension of the throat pipe 320b along the front-rear direction in the tank 20 can be reduced. As a result, the size of the tank 20 along the front-rear direction can be further reduced without sacrificing the performance of the jet pump.

  In addition, you may arrange | position the throat pipe | tube 320a which concerns on 2nd embodiment as mentioned above. That is, the throat pipe 320a may be arranged so that the position of the front end of the suction port 331a is on the front side of the position of the rear end of the inlet 131 of the water conduit 130.

  Subsequently, a flush toilet apparatus FTc according to a fourth embodiment of the present invention will be described. The flush toilet apparatus FTc differs from the flush toilet apparatus FT in the direction in which the first throat pipe 330c moves. FIG. 33 is a view for explaining the movement of the first throat pipe 330c in the flush toilet apparatus FTc.

  As described with reference to FIG. 6 and the like, the first throat pipe 330 of the flush toilet apparatus FT has a shaft 341 disposed so that the central axis is horizontal with respect to the second throat pipe 350 as a rotation axis. It was possible to move to rotate. That is, it was possible to move along the vertical plane.

  On the other hand, in the flush toilet apparatus FTc, the shaft 341c is disposed in a state where the central axis thereof is inclined with respect to the horizontal plane. Further, the shaft 341c is disposed so that its central axis is perpendicular to the central axis of the first throat pipe 330c. For this reason, the first throat pipe 330c can move along the plane inclined with respect to the vertical plane (in the direction indicated by the arrow AR9).

  In such a configuration, even if the vertical dimension of the tank 20 is small, the movable range of the first throat pipe 330c can be secured in the tank 20. What is necessary is just to set suitably the angle which the direction which the 1st throat pipe | tube 330c moves and the perpendicular direction makes in the range which can maintain the state which can move the 1st throat pipe | tube 330c at an appropriate and fixed timing.

  Subsequently, a flush toilet apparatus FTd according to a fifth embodiment of the present invention will be described. The flush toilet apparatus FTd is different from the flush toilet apparatus FT in the shape of the tank 20d. FIG. 34 is a diagram for explaining the shape of the tank 20d, and schematically shows the arrangement of the throat pipe 320 and the like inside the tank 20d in a top view.

  As shown in FIG. 34, in the tank 20d, the front wall 223 of the second tank portion 220d has a curved shape so as to protrude toward the rear side when viewed from above. Since the wall 223d of the second tank portion 220d has such a shape, the wave generated inside the second tank portion 220d is attenuated when it hits the wall 223. Further, the internal space of the second tank portion 220d has a narrow width in the front-rear direction at a part thereof (in the present embodiment, the central portion in the left-right direction). Therefore, since the wave generated inside the second tank portion 220d is prevented from propagating to the entire second tank portion 220d, it is further easily attenuated. As a result, generation of noise due to air flowing into the throat pipe 320 from the suction port 331 is suppressed.

  Further, in the tank 20d, a suction port 331 formed at the end of the throat pipe 320 is disposed in the vicinity of the right side wall surface 215 of the second tank portion 220d. That is, it is arranged at a position that avoids the narrowed portion (the central portion in the left-right direction) of the internal space of the second tank portion 220d as described above. As a result, the internal space of the second tank portion 220d is effectively used, and the enlargement of the tank 20d is further suppressed.

  Further, the front wall 223d of the second tank portion 220d is curved as described above, so that the front and outer wall surfaces of the second tank portion 220d (the rear side end of the toilet main body 10). The wall surface facing the portion is shaped so that a part of the wall recedes toward the rear side. As a part of the second tank portion 220d is retracted, a concave space SP is formed on the front side and the outside of the second tank portion 220d. The rear side end portion of the toilet body 10 is accommodated in the space SP. With such a configuration, the size of the entire flush toilet apparatus FTd in the front-rear direction is further reduced.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above and their arrangement, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, but can be changed as appropriate. Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

10: Toilet bowl main body 101: Upper surface 110: Bowl part 120: Rim part 130: Water conduit 131: Inlet 132: First water conduit 133: Outlet 134: Second water conduit 135: Outlet 140: Drain trap pipe 141: Ascending Channel 142: Downstream channel 20, 20d: Tank 201: Upper lid 210: First tank part 211: Bottom wall 212: Opening 213: Front side wall surface 214: Left side wall surface 215: Right side wall surface 216: Rear side wall surface 220, 220d: No. Two tank parts 221: Bottom wall 223, 223d: Wall 231: Water supply pipe 232: Constant flow valve 233: Main valve 234: Pilot valve 235: Vacuum breaker 236: Manual lever 237: Transmission mechanism 238: Float 239: Connection pipe 240: Partition 241: Open / close window 260: Small tank 300: Jet pump unit 310: Noz 311: Injection port 320, 320a, 320b: Throat tube 330, 330c: First throat tube 331, 331a, 331b: Suction port 332: Opening 333: Projection 335: Inclined surface 341, 341c: Shaft 350, 350a: Second throat Pipe 351: Vertical portion 352: Bending portion 353: Opening 354: Stopper 380: Float 381: Inclined surface B: Bolt C1: First corner CA: Center axis FF: Friction force FL: Jet FT, FTa, FTb, FTc, FTd: flush toilet equipment SP: space SW: drain pipe VU: valve unit WS: water surface WT: sealed water

Claims (10)

A flush toilet device that discharges filth to a drain pipe with washing water,
A toilet body having a bowl portion for receiving filth, and a water conduit for guiding water supplied as washing water to the bowl portion;
A tank that stores water therein and is arranged so that the water can be supplied to the inlet of the water conduit;
A jet pump unit disposed in a state where at least a part of the tank is submerged in water,
The jet pump unit is
A throat pipe having one end connected to the inlet of the water conduit and a suction port formed at the other end, the suction port being located at the lower part of the inside of the tank; ,
A nozzle that induces a jet pump action by spraying high-speed water from the suction port toward the inside of the throat pipe, and
One of the throat pipe or the nozzle can move inside the tank, and can take a state stopped at the first position and a state stopped at the second position,
The first position is a position such that when water is jetted from the nozzle in a state stopped at the position, the jetted water is supplied from the suction port to the inside of the throat pipe.
In the second position, when water is ejected from the nozzle while stopped at the position, at least a part of the ejected water is supplied to the inside of the tank outside the suction port. A flush toilet device characterized by being in position. The throat pipe has a first throat portion that is a portion on the suction port side and a second throat portion that is a portion on the inlet side of the water conduit,
When the first throat portion moves with respect to the second throat portion, the state stopped at the first position and the state stopped at the second position can be taken. The flush toilet apparatus according to claim 1. The jet pump unit further includes a float that moves the first throat portion in accordance with a change in the level of water stored in the tank.
The first throat portion is configured to move from the first position to the second position as the water level stored in the tank decreases. The flush toilet apparatus according to claim 2. The first throat portion has a guide member,
In a state in which the first throat portion is stopped at the second position, the first throat portion is held at the second position by the water sprayed from the nozzle directly hitting the guide member. The flush toilet apparatus according to claim 3, characterized in that   The flush toilet apparatus according to claim 4, wherein the guide member is at least a part of the float. The first throat portion is connected to the second throat portion via a swing shaft,
The swing shaft is arranged on the lower surface side of the first throat portion and the second throat portion so that the first throat portion moves along a vertical plane. The flush toilet device according to 1. In a state where the first throat portion is stopped at the first position,
The flush toilet apparatus according to claim 3, wherein the traveling direction of the water jetted from the nozzle is non-parallel to the central axis of the first throat portion. When a plane that includes both the central axis of the first throat portion at the first position and the central axis of the first throat portion at the second position is defined as a moving surface,
In a state where the first throat portion is stopped at the first position,
The traveling direction of the water sprayed from the nozzle is not parallel to the central axis of the first throat part and parallel to the moving surface. Flush toilet equipment. The first throat portion is configured to move along a vertical plane,
The traveling direction of the water sprayed from the nozzle in a state where the first throat portion is stopped at the first position prevents the first throat portion from moving from the first position to the second position. 9. The flush toilet apparatus according to claim 8, wherein the flush toilet apparatus is in such a direction. The absolute value of the ratio of the amount of change in the size of buoyancy received by the float from the water stored in the tank to the amount of change in the water level of the water stored in the tank was defined as the buoyancy change rate. sometimes,
The buoyancy change rate when the first throat portion moves from the first position to the second position is greater than the buoyancy change rate when the first throat portion stops at the first position. The flush toilet apparatus according to claim 3, wherein: