Water closet

Abstract

To provide a water closet capable of preventing odor from a drain pipe from leaking into a toilet space due to a loss of water seal.SOLUTION: A water closet according to an embodiment comprises a changeover section. The changeover section has at least a first washing state in which a first changeover valve body is opened and a second changeover valve body is closed, and a second washing state in which the first changeover valve body is closed and the second changeover valve body is opened. When an abnormality detection section detects an abnormality while a pressure pump maintains a rotation number for implementing the first washing state, the pressure pump increases the rotation number to transition to the second washing state. When the abnormality detection section detects an abnormality while the pressure pump maintains a rotation number for implementing the second washing state, the pressure pump decreases the rotation number to transition to the first washing state.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The disclosed embodiments relate to a flush toilet. [Background technology]

[0002] Conventionally, a toilet seat apparatus has been disclosed that mechanically switches between rim cleaning and jet cleaning (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-87481 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional technology, the switching valve body is provided separately on the rim water outlet side and the jet water outlet side. The switching valve body is configured so that the switching valve body on the rim water outlet side opens the water supply path on the rim water outlet side during rim flushing, and the switching valve body on the jet water outlet side opens the water supply path on the jet water outlet side during jet flushing. In this configuration, if the switching valve body does not operate as expected due to a malfunction of the switching valve body, a state may occur in which flush water is not discharged from either the rim water outlet or the jet water outlet. If flush water is not discharged from either the rim water outlet or the jet water outlet, there is a risk that the seal will break and odors will leak from the drain pipe into the toilet space.

[0005] One aspect of the embodiment has been made in view of the above, and aims to provide a flush toilet that can prevent odors from leaking from the drain pipe into the toilet space due to a water seal failure. [Means for solving the problem]

[0006] A flush toilet according to one aspect of an embodiment is a flush toilet that is flushed with flush water pressurized by a pressure pump, and comprises a toilet body having a water storage tank that stores flush water, a bowl portion, a rim spout and a jet spout that spout flush water, and a drain trap portion, a water supply passage that enables flush water to be supplied from the water storage tank to each of the rim spout and the jet spout, a switching portion that is provided in the water supply passage and switches the water supply path that supplies flush water to each of the rim spout and the jet spout, and an abnormality detection portion that detects a state in which flush water is not being spouted to the bowl portion when the pressure pump is operating as an abnormality, the switching portion having a first switching valve body for adjusting the amount of flush water from the rim spout and a second switching valve body for adjusting the amount of flush water from the jet spout, and the first switching valve body and the second switching valve body are pressurized by the pressure pump. The pressure switch valve is mechanically operated by receiving the water pressure of the wash water, and the first switching valve body closes the rim water outlet when the water pressure of the wash water is greater than a predetermined water pressure, and the second switching valve body opens the jet water outlet when the water pressure of the wash water is greater than the predetermined water pressure. The switching unit has at least a first flushing state in which the first switching valve body is open and the second switching valve body is closed, and a second flushing state in which the first switching valve body is closed and the second switching valve body is open. If the abnormality detection unit detects an abnormality while the pressurizing pump is maintaining a rotation speed for implementing the first flushing state, the pressurizing pump increases its rotation speed to transition to the second flushing state, and if the abnormality detection unit detects an abnormality while the pressurizing pump is maintaining a rotation speed for implementing the second flushing state, the pressurizing pump reduces its rotation speed to transition to the first flushing state.

[0007] Even if a malfunction occurs in the first or second switching valve body and flush water is not supplied to the bowl portion, the flush toilet responds to the malfunction by switching the flush state so that flush water is supplied to the bowl portion. In other words, the flush toilet can prevent a situation where flush water is not discharged from either the rim spout or the jet spout. This allows the flush toilet to prevent odors from leaking from the drain pipe into the toilet space due to a water seal failure.

[0008] In addition, the second cleaning state has a second cleaning state under abnormal conditions in which the opening degree of the second switching valve body is smaller than under normal conditions, and if the abnormality detection unit detects an abnormality while the pressurizing pump is maintaining the rotation speed for implementing the first cleaning state, the pressurizing pump increases its rotation speed to transition to the second cleaning state under abnormal conditions.

[0009] Even if a malfunction occurs in the first switching valve body during rim flushing and flush water is not supplied to the bowl, the flush toilet will discharge flush water from the jet spout with a weaker water force than normal. This allows the flush toilet to form a water seal with the flush water discharged from the jet spout, preventing odors from leaking from the drain pipe into the toilet space due to a broken water seal.

[0010] Furthermore, the rate at which the rotation speed of the pressurizing pump decreases during a valve closing operation of the second switching valve body fluctuates more slowly than the rate at which the rotation speed of the pressurizing pump increases during a valve opening operation of the second switching valve body.

[0011] By suppressing pulsation caused by vibration when the second switching valve closes, the flush toilet can prevent the first switching valve body from sliding properly in the operating direction and failing to open. This makes it possible for the flush toilet to prevent odors from leaking from the drain pipe into the toilet space due to a water seal failure.

[0012] Further, a flow straightening member that straightens the wash water flowing toward the first switching valve body is provided upstream of the first switching valve body.

[0013] In a flush toilet, for example, when the second switching valve body closes forcefully, the flush toilet can prevent the first switching valve body from sliding properly in the operating direction and failing to open by suppressing pulsation caused by vibrations during the second switching valve closing operation. This makes it possible for the flush toilet to prevent odors from leaking from the drain pipe into the toilet space due to a water seal failure.

[0014] The flow straightening member is a flow straightening fin having a curved shape that is convex inward in the flow path direction of the cleaning water.

[0015] The flush toilet can guide flush water that gathers in the center of the flow path outward in the flow path. Therefore, the flush toilet can prevent the first switching valve body from sliding properly in the operating direction and failing to open due to pulsation caused by, for example, the second switching valve body closing forcefully. This allows the flush toilet to prevent odors from leaking from the drain pipe into the toilet space due to a water seal failure.

[0016] Moreover, the first switching valve element opens or closes as a result of the first switching valve element moving in an actuation direction, and the first switching valve element is provided with a guide member that restricts movement of the first switching valve element in the actuation direction.

[0017] The flush toilet can suppress uneven contact of the first switching valve body with the valve seat when the first switching valve body closes, and deviations in the closing time due to unstable operation of the first switching valve body, etc. This allows the flush toilet to more appropriately switch flushing states. Effect of the Invention

[0018] According to one aspect of the embodiment, a water seal break can prevent odors from the drain pipe from leaking into the toilet space. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a schematic diagram illustrating the overall configuration of a flush toilet according to an embodiment. [Diagram 2]FIG. 2 is a vertical cross-sectional view of the switching valve device of the flush toilet according to the embodiment, showing the open state of the switching valve device in the first flush process. [Diagram 3] 3 is a cross-sectional view of the support member and the guide member taken along line III-III in FIG. 2. [Figure 4] FIG. 2 is a vertical cross-sectional view of the switching valve device of the flush toilet according to the embodiment, showing the open state of the switching valve device in the second flush process. [Diagram 5] FIG. 2 is a vertical cross-sectional view of the switching valve device of the flush toilet according to the embodiment, showing the open state of the switching valve device in the third flush step. [Figure 6] 4 is a time chart showing the basic operation of the flush toilet according to the embodiment. [Figure 7] FIG. 2 is a vertical cross-sectional view of a switching valve device of a flush toilet according to an embodiment, showing the open state of the switching valve device when a malfunction occurs. [Figure 8] 13 is a time chart showing the operation of a flush toilet according to an embodiment when an abnormality is detected in the first flush state. [Figure 9] 13 is a time chart showing the operation of a flush toilet according to an embodiment when an abnormality is detected in the first flush state. [Figure 10] 13 is a time chart showing the operation of a flush toilet according to an embodiment when an abnormality is detected in the second flush state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0021] First, the configuration of a flush toilet according to an embodiment will be explained with reference to Figure 1. Figure 1 is a schematic diagram of the overall configuration of a flush toilet 1 according to an embodiment.

[0022] As shown in FIG. 1, the flush toilet 1 comprises a toilet body 2 made of ceramic or the like, and a functional part 4 located at the rear of the toilet body 2.

[0023] The toilet body 2 has a bowl portion 6, a rim water supply passage 8 including a rim water spout 8a, a jet water supply passage 10 including a jet water spout 10a, and a drain trap pipe line 12 (drain trap portion).

[0024] The functional section 4 has, from the upstream side to the downstream side, a water supply pipe 14, an electromagnetic valve 16, a water storage tank 18, a pressure pump 20, and a switching valve device 22. The functional section 4 also has an abnormality detection device 23 connected to the pressure pump, for example. Here, the description will be given assuming that the water supply side, which is the water supply source, is the upstream side in the direction in which the flush water flows, and the bowl section 6 side is the downstream side.

[0025] The upstream side of the water supply pipe 14 is directly connected to a water main. The downstream side of the water supply pipe 14 is connected to a water storage tank 18. The solenoid valve 16 is provided midway through the water supply pipe 14 and is opened and closed under the control of a controller 24. As a result, the functional unit 4 is configured to supply or stop the flush water in the water supply pipe 14 to the water storage tank 18.

[0026] The booster pump 20 is provided in a water supply passage 26 extending downstream from the water storage tank 18. The booster pump 20 is a so-called "axial flow pump" suitable for a large flow rate with a low head, but the details of its structure are well known and will not be described here. The rotation speed N [rpm] of the impeller (not shown) of the booster pump 20 can be adjusted by the control of the controller 24.

[0027] The switching valve device 22 is provided in the water supply passage 26 downstream of the pressure pump 20, and although its detailed structure will be described later, it opens and closes in response to the water pressure of flush water pressurized by the pressure pump 20. In this way, the switching valve device 22 functions as a switching section that switches the water supply path that supplies flush water to each of the rim water spout 8a of the toilet body 2 and the jet water spout 10a.

[0028] The abnormality detection device 23 measures the value of the current flowing through the pressure pump 20. If the current value measured by the abnormality detection device 23 is smaller than a predetermined value when the pressure pump 20 is operating, the control unit 60 determines that flush water is not being discharged into the bowl portion 6. In this way, the abnormality detection device 23 functions as an abnormality detection unit that detects, as an abnormality, a state in which flush water is not being discharged into the bowl portion 6 when the pressure pump 20 is operating. The abnormality detection device 23 may be, for example, a device provided in the water supply path 26 that detects whether flush water is flowing or not.

[0029] Next, the switching valve device 22 will be described in detail with reference to Figs. 1 to 4. Fig. 2 is a vertical cross-sectional view of the switching valve device 22 of the flush toilet 1 according to the embodiment, showing the open state of the switching valve device 22 in the first flushing process. Fig. 3 is a cross-sectional view along line III-III of the first support part 38 and guide member 47 in Fig. 2. Fig. 4 is a vertical cross-sectional view of the switching valve device 22 of the flush toilet 1 according to the embodiment, showing the open state of the switching valve device 22 in the second flushing process.

[0030] As shown in FIGS. 1 and 2, the switching valve device 22 has an upstream water supply passage 28, a rim water supply passage 30, a jet water supply passage 32, a first switching valve body 33, and a second switching valve body 39.

[0031] The upstream side of the upstream water supply passage 28 is connected to the water supply passage 26 extending from the pressure pump 20. The upstream side water supply passage 28 branches off from its upstream side, with one downstream side of the branch connected to the rim water supply passage 30 and the other downstream side of the branch connected to the jet water supply passage 32. The downstream side of the rim water supply passage 30 is connected to the rim water supply passage 8 upstream of the rim water spout 8a of the toilet body 2. The downstream side of the jet water supply passage 32 is connected to the jet water supply passage 10 upstream of the jet water spout 10a of the toilet body 2.

[0032] Incidentally, a constant flow valve 35 is provided midway through the rim water supply passage 8 of the toilet body 2. This makes it possible to prevent water from leaking outside the machine, such as when the rim spout water that passes through the rim water supply passage 8 of the toilet body 2 and is spouted from the rim spout 8a into the bowl section 6 splashes out. Note that, although the constant flow valve 35 is provided in the rim water supply passage 8 in this embodiment, a constant flow function may also be imparted to the switching valve device 22.

[0033] The first switching valve body 33 is provided so as to be able to open and close at the upstream end of the rim water supply passage 30. In this way, the first switching valve body 33 opens and closes the rim water supply passage 30.

[0034] The second switching valve body 39 is provided so as to be able to open and close at the upstream end of the jet water supply passage 32. In this way, the second switching valve body 39 opens and closes the jet water supply passage 32.

[0035] 1 and 2, when the first switching valve body 33 is open and the second switching valve body 39 is closed, flush water in the upstream water supply passage 28 is supplied to the rim water outlet 8a via the rim water supply passage 30 and the rim water supply passage 8 on the toilet body 2 side. In this way, the state in which the first switching valve body 33 is open and the second switching valve body 39 is closed is called the first flush state.

[0036] On the other hand, as shown in Figure 4, when the first switching valve body 33 is closed and the second switching valve body 39 is open, flush water in the upstream water supply passage 28 is supplied to the jet water spout 10a via the jet water supply passage 32 and the jet water supply passage 10 on the toilet body 2 side. In this way, the state in which the first switching valve body 33 is closed and the second switching valve body 39 is open is called the second flush state.

[0037] The first switching valve body 33 has a first valve body portion 33a and a first valve shaft portion 33b. The switching valve device 22 has a first valve seat portion 36, a first spring portion 37, and a first support portion 38. The first valve body portion 33a can approach and separate from the upstream side of the first valve seat portion 36 by the operation of the first valve body portion 33a and the first valve shaft portion 33b. The first valve shaft portion 33b extends in the direction of an axis C1 perpendicular to the first valve seat portion 36 (operation direction). One end of the first spring portion 37 is supported by the first valve body portion 33a, and the other end is supported by the first support portion 38, and is elastically deformable in the operation direction. As a result, the first spring portion 37 applies a biasing force F1 to the first valve body portion 33a in a direction to open the valve in accordance with the amount of bending of the compressed portion.

[0038] Here, when the upstream surface of the first valve body portion 33a (hereinafter referred to as the "pressure-receiving surface") receives water pressure equal to or greater than a predetermined water pressure of flush water pressurized by the pressure pump 20, the first spring portion 37 elastically deforms, causing the first valve body portion 33a and the first valve shaft portion 33b to mechanically operate in the same direction as the flow path direction of the rim water supply passage 30 (axis C1 direction, operating direction), and the first valve body portion 33a closes the rim water supply passage 30. This makes it possible for the rim water supply passage 30 to be opened and closed by the first valve body portion 33a in response to the water pressure.

[0039] The second switching valve body 39 has a second valve body portion 39a and a second valve shaft portion 39b. The switching valve device 22 has a second valve seat portion 42, a second spring portion 43, and a second support portion 44. The second valve body portion 39a can approach and separate from the downstream side of the second valve seat portion 42 by the operation of the second valve body portion 39a and the second valve shaft portion 39b. The second valve shaft portion 39b extends in the direction of an axis C2 perpendicular to the second valve seat portion 42 (operation direction). One end of the second spring portion 43 is supported by the second valve body portion 39a, and the other end is supported by the second support portion 44, and is elastically deformable in the operation direction. As a result, the second spring portion 43 applies a biasing force F2 to the second valve body portion 39a in a direction to open the valve in accordance with the amount of bending of the compressed portion.

[0040] Here, when the upstream surface of the second valve body 39a (hereinafter referred to as the "pressure-receiving surface") receives water pressure equal to or greater than a predetermined water pressure of wash water pressurized by the pressure pump 20, the second spring portion 43 elastically deforms, causing the second valve body 39a and the second valve shaft portion 39b to mechanically operate in the same direction as the flow path direction (axis C2 direction, operating direction) of the jet water supply passage 32, and the second valve body portion 39a opens the jet water supply passage 32. This allows the jet water supply passage 32 to be opened and closed by the second valve body portion 39a in response to the water pressure.

[0041] In this embodiment, "the first switching valve body 33 and the second switching valve body 39 are mechanically operated" means that the first switching valve body 33 and the second switching valve body 39 are different from electrical valve bodies that are electrically operated (electrically opened and closed) by control of an electrical signal or electromagnetic force, etc., and means that the first switching valve body 33 and the second switching valve body 39 are mechanical valve bodies that are mechanically operated (mechanically opened and closed) by being pressed by the direct action of water pressure, etc. when opening and closing.

[0042] Next, as shown in FIGS. 2 and 3, the valve switching device 22 further includes a flow rectifying member 45 and a guide member 47.

[0043] As shown in FIG. 2, the straightening member 45 is, for example, a straightening fin 46. The straightening fin 46 has a curved shape that is convex toward the inside in the flow path direction of the flush water. In other words, the straightening fin 46 has a curved shape that protrudes toward the center side in the radial direction of the upstream water supply path 28. The straightening fin 46 is attached to the inner circumferential surface of the upstream water supply path 28 on the upstream side of the first switching valve body 33. As a result, the straightening fin 46 reduces the flow velocity distribution and straightens the flow of the flush water by changing a state in which the flush water in the center of the flow path direction flows more easily than the flush water on the outside of the flow path direction to a state in which the flush water on the outside of the flow path direction and the center of the flow path direction flows more easily evenly. Note that the straightening member 45 is not limited to the straightening fin 46, and may be, for example, a straightening plate or the like.

[0044] As shown in Figs. 2 and 3, the guide member 47 is composed of, for example, a recess 38a of the first support portion 38 and a protrusion 33c of the first valve shaft portion 33b. Two recesses 38a are formed so as to face each other across the central axis of the cylindrical first support portion 38. Two protrusions 33c are formed on the outer circumferential surface of the first valve shaft portion 33b so as to be engageable with the recesses 38a. The first valve shaft portion 33b is slidably supported by the support member 40 with the protrusions 33c engaging with the recesses 38a of the first support portion 38. As a result, the guide member 47 restricts the movement of the first switching valve body 33 so as to operate in the axial C1 direction (operation direction).

[0045] Next, the operation of the flush toilet 1 according to the embodiment will be explained with reference to Figures 1 to 6. Figure 6 is a time chart showing the basic operation of the flush toilet 1 according to the embodiment.

[0046] First, as shown in Fig. 6, at time t1 after the standby state at time t0, when the toilet flush switch (not shown) is operated, the power supply to the solenoid valve 16 and the pressurizing pump 20 is changed from an OFF state to an ON state under the control of the controller 24. This causes the pressurizing pump 20 to operate, and the rotation speed N [rpm] of the pressurizing pump 20 increases to a rotation speed N1 [rpm]. By operating this pressurizing pump 20, as shown in Fig. 1, flush water in the water storage tank 18 is supplied to the upstream water supply line 28 of the switching valve device 22 via the water supply line 26.

[0047] 2, in the first switching valve body 33 of the switching valve device 22, the biasing force F1 acting on the first valve body portion 33a by the first spring portion 37 exceeds the fluid force acting on the pressure-receiving surface of the first valve body portion 33a by the water pressure (dynamic pressure) P1 in the upstream water supply passage 28 of the switching valve device 22. As a result, the first valve body portion 33a is in a state in which it opens the rim water supply passage 30 (open valve state).

[0048] Meanwhile, in the second switching valve body 39 of the switching valve device 22, the biasing force F2 acting on the second valve body portion 39a by the second spring portion 43 exceeds the fluid force acting on the pressure-receiving surface of the second valve body portion 39a by the water pressure (static pressure) P2 in the upstream water supply passage 28 of the switching valve device 22. As a result, the second valve body portion 39a is in a state in which it closes the jet water supply passage 32 (closed valve state). That is, the switching valve device 22 is in a first flushing state in which the first switching valve body 33 is open and the second switching valve body 39 is closed.

[0049] Therefore, flush water W1 supplied to the upstream water supply passage 28 of the switching valve device 22 from the pressure pump 20 shown in Figure 1 at a rotation speed N1 [rpm] is supplied only from the upstream water supply passage 28 to the rim water supply passage 30, and is not supplied to the jet water supply passage 32. The flush water in this rim water supply passage 30 then passes through the constant flow valve 35 and is spouted from the rim water outlet 8a of the rim water supply passage 8 of the toilet body 2 into the bowl section 6. As a result, in the period from time t1 to time t2 shown in Figure 6, a first rim spouting is performed from the rim water outlet 8a, and a first rim flush is performed as the first flush process.

[0050] 6, at time t2, the rotation speed N [rpm] of the pressure pump 20 starts to increase from the rotation speed N1 [rpm] to the rotation speed N2 [rpm] (N2>N1). After the rotation speed N [rpm] of the pressure pump 20 increases at a constant speed, it is maintained at the constant rotation speed N2 [rpm] until time t3.

[0051] At this time, in the first switching valve body 33 of the switching valve device 22, the fluid force acting on the pressure-receiving surface of the first valve body portion 33a due to the water pressure (dynamic pressure) P1 in the upstream water supply passage 28 of the switching valve device 22 exceeds the biasing force F1 acting on the first valve body portion 33a by the first spring portion 37 shown in Fig. 2. As a result, the first valve body portion 33a is in a state in which it closes the rim water supply passage 8 (closed valve state).

[0052] Furthermore, as shown in FIG. 4, a water pressure (static pressure) P3 acts on the pressure-receiving surface of the first valve body portion 33a in the closed state, and the fluid force equivalent to this water pressure (static pressure) P3 also exceeds the biasing force F3 of the first spring portion 37, so that the closed state of the first switching valve body 33 is maintained.

[0053] On the other hand, in the second switching valve body 39 of the switching valve device 22, the fluid force acting on the pressure-receiving surface of the second valve body portion 39a due to the water pressure (static pressure) P2 in the upstream water supply passage 28 of the switching valve device 22 exceeds the biasing force F2 acting on the second valve body portion 39a by the second spring portion 43 shown in Fig. 2. As a result, the second valve body portion 39a is in a state in which it opens the jet water supply passage 32 (open valve state).

[0054] 4, a water pressure (dynamic pressure) P4 acts on the pressure-receiving surface of the second valve body portion 39a in the open state, and the fluid force equivalent to this water pressure (dynamic pressure) P4 also exceeds the biasing force F4 by the second spring portion 43, so the second switching valve body 39 is maintained in the closed state. That is, the switching valve device 22 is in the second flushing state in which the first switching valve body 33 is closed and the second switching valve body 39 is open.

[0055] 1 into the upstream water supply passage 28 of the switching valve device 22 at a rotation speed N2 [rpm] is supplied only from the upstream water supply passage 28 to the jet water supply passage 32, and is not supplied to the rim water supply passage 30. The flush water in this jet water supply passage 32 is then spouted from the jet water spouting outlet 10a of the jet water supply passage 10 of the toilet body 2 into the bowl section 6. As a result, jet spouting is performed during the period from time t2 to time t3 shown in Figure 6, and jet flushing is performed as the second flushing process.

[0056] Next, as shown in Fig. 6, at time t3, the rotation speed N [rpm] of the pressurizing pump 20 starts to decrease from the rotation speed N2 [rpm] to the same rotation speed N1 [rpm] as in the first cleaning step. From time t3 to time t4, the speed fluctuates more slowly and the rotation speed N [rpm] decreases than when the rotation speed N [rpm] of the pressurizing pump 20 increases to the rotation speed N2 from time t2 to time t3. For example, as time passes from time t3, the fluctuation in the speed of the rotation speed N [rpm] of the pressurizing pump 20 gradually increases. As time approaches time t4, the fluctuation in the speed of the rotation speed N [rpm] of the pressurizing pump 20 gradually decreases.

[0057] From time t3 to time t4, the water pressure in the upstream water supply passage 28 of the switching valve device 22 from time t3 to time t4 decreases by an amount corresponding to the decrease in the rotation speed N [rpm] of the pressure pump 20. However, as shown in Fig. 4, the fluid force acting on the pressure-receiving surface of the first valve body portion 33a due to the water pressure (static pressure) P3 in the upstream water supply passage 28 of the switching valve device 22 exceeds the biasing force F3 acting on the first valve body portion 33a by the first spring portion 37, so the first switching valve body 33 is maintained in a closed state.

[0058] On the other hand, the biasing force F4 acting on the second valve body portion 39a by the second spring portion 43 gradually exceeds the fluid force acting on the pressure-receiving surface of the second valve body portion 39a due to the water pressure (dynamic pressure) P4 in the upstream water supply passage 28 of the switching valve device 22, so that the second switching valve body 39 operates in the operating direction to close the valve at a slower speed than during the valve opening operation.

[0059] As a result, jet water spouting is performed from the jet water spouting port 10a during the period from time t2 to time t4, and jet cleaning is performed as the second cleaning process.

[0060] 6, at time t4, the rotation speed N [rpm] of the pressure pump 20 decreases to the same rotation speed N1 [rpm] as in the first cleaning step, and then, from time t4 to time t5, the rotation speed N [rpm] of the pressure pump 20 is maintained at a constant rotation speed N1 [rpm].

[0061] 5, in the first switching valve body 33 of the switching valve device 22, the biasing force F1 acting on the first valve body portion 33a by the first spring portion 37 exceeds the fluid force acting on the pressure-receiving surface of the first valve body portion 33a by the water pressure (dynamic pressure) P1 in the upstream water supply passage 28 of the switching valve device 22. As a result, the first valve body portion 33a is in a state in which it opens the rim water supply passage 30 again (open valve state).

[0062] On the other hand, in the second switching valve body 39 of the switching valve device 22, the biasing force F2 acting on the second valve body portion 39a by the second spring portion 43 exceeds the fluid force acting on the pressure-receiving surface of the second valve body portion 39a by the water pressure (static pressure) P2 in the upstream water supply passage 28 of the switching valve device 22. As a result, the second valve body portion 39a is in a state in which it closes the jet water supply passage 32 again (closed valve state).

[0063] Therefore, flush water W1 supplied to the upstream water supply passage 28 of the switching valve device 22 from the pressure pump 20 shown in Figure 1 at rotation speed N1 [rpm] is supplied only from the upstream water supply passage 28 to the rim water supply passage 30, and is not supplied to the jet water supply passage 32. The flush water in this rim water supply passage 30 then passes through the constant flow valve 35 and is spouted from the rim water outlet 8a of the rim water supply passage 8 of the toilet body 2 into the bowl section 6. As a result, a second rim spouting from the rim water outlet 8a is carried out from time t4 to time t5 shown in Figure 6, and a second rim flush is carried out as the third flush process.

[0064] Incidentally, as shown in FIG. 1, water is supplied from the water supply pipe 14 to the water storage tank 18 by controlling the opening and closing of the solenoid valve 16 by the controller 24, and as shown in FIG. 6, from time t1 to time t6, the solenoid valve 16 is in the open state and water is supplied to the water storage tank 18.

[0065] Next, operation when an abnormality is detected in the first flush step will be explained with reference to Figures 7 and 8. Figure 7 is a vertical cross-sectional view of the switching valve device 22 of the flush toilet 1 according to the embodiment, and shows the open state of the switching valve device 22 when a malfunction occurs. Figures 8 and 9 are time charts showing operation when an abnormality is detected in the first flush state of the flush toilet 1 according to the embodiment.

[0066] In the following, the same processing as the basic operation described above will not be described. Also, when the abnormality detection device 23 detects an abnormality in the third cleaning process, the same processing as when the abnormality detection device 23 detects an abnormality in the first cleaning process can be performed, so the description thereof will be omitted.

[0067] 7, when the first valve body 33a closes the rim water supply passage 30 and the second valve body 39a closes the jet water supply passage 32, flush water is not discharged into the bowl portion 6 even when the pressure pump 20 is operating. At this time, the current flowing through the pressure pump 20 decreases, and the abnormality detection device 23 detects an abnormality. For example, when the timing of opening and closing of the first valve body 33a and the second valve body 37b is shifted due to trapped dirt or pulsation of flush water, both the first valve body 33a and the second valve body 39a are in the closed state as described above.

[0068] As shown in Figure 8, when the first rim cleaning is performed as the first cleaning process from time t1, at time t7, a malfunction occurs in the first valve body portion 33a, causing it to close the rim water supply passage 30 (closed valve state), and the abnormality detection device 23 detects an abnormality.

[0069] At time t7, the rotation speed N [rpm] of the pressurizing pump 20 starts to increase from the rotation speed N1 [rpm] to the rotation speed N2 [rpm]. After the rotation speed N [rpm] of the pressurizing pump 20 increases, it is maintained at a substantially constant rotation speed N2 [rpm] until time t5.

[0070] When the rotation speed N [rpm] of the pressurizing pump 20 reaches the rotation speed N2 [rpm], the second valve body portion 39a opens the jet water supply passage 32 (valve open state), as in the process from time t2 to time t3 described above, and thereafter, the valve closed state of the second switching valve body 39 is maintained. Therefore, flush water W1 supplied from the pressurizing pump 20 shown in FIG. 1 at the rotation speed N2 into the upstream water supply passage 28 of the switching valve device 22 is supplied from the upstream water supply passage 28 to the jet water supply passage 32. Then, flush water in this jet water supply passage 32 is spouted from the jet water spouting port 10a of the jet water supply passage 10 of the toilet body 2 into the bowl portion 6. As a result, jet spouting is performed during the period from time t7 to time t5 shown in FIG. 8, and jet flushing is performed as the second flushing process.

[0071] As shown in FIG. 9, at time t7, when the first valve body 33a closes the rim water supply passage 30 (closed valve state) due to a malfunction and the abnormality detection device 23 detects an abnormality, the rotation speed N [rpm] of the pressurizing pump 20 may be increased to the rotation speed N3 [rpm] as the second abnormality flush state in which the opening degree of the second switching valve body 39 is smaller than that in normal times. The rotation speed N3 [rpm] of the pressurizing pump 20 is smaller than the rotation speed N2 [rpm] (N2>N3>N1). For example, at time t7, the rotation speed N [rpm] of the pressurizing pump 20 starts to increase from the rotation speed N1 [rpm] to the rotation speed N3 [rpm]. After the rotation speed N [rpm] of the pressurizing pump 20 increases, it is maintained at a substantially constant rotation speed N3 [rpm] until time t5. As a result, water is supplied to the bowl section 6 from the jet water discharge port 10a, and the bowl section 6 can be prevented from running out of water seal.

[0072] Next, operation when an abnormality is detected in the second flushing state will be described with reference to Figure 10. Figure 10 is a time chart showing operation when an abnormality is detected in the second flushing state of the flush toilet 1 according to the embodiment.

[0073] As shown in FIG. 10, when jet cleaning is performed as the second cleaning process from time t2, at time t8, a malfunction occurs in the first valve body portion 33a, causing it to close the jet water supply passage 32 (closed valve state), and the abnormality detection device 23 detects the abnormality.

[0074] At time t9, the rotation speed N [rpm] of the pressure pump 20 is reduced to the same rotation speed N1 [rpm] as in the first cleaning step. After the rotation speed N [rpm] of the pressure pump 20 is reduced, it is maintained at a constant rotation speed N1 [rpm] until time t5.

[0075] As at time t4 above, the first valve body portion 33a is in a state in which it opens the rim water supply passage 30 (valve open state), and thereafter the open state of the first valve body portion 33a is maintained. Therefore, flush water W1 supplied from the pressure pump 20 shown in FIG. 1 at rotation speed N1 into the upstream water supply passage 28 of the switching valve device 22 is supplied from the upstream water supply passage 28 to the rim water supply passage 30. Then, flush water in this rim water supply passage 30 passes through the constant flow valve 35 and is spouted from the rim water outlet 8a of the rim water supply passage 8 of the toilet body 2 into the bowl portion 6. As a result, in the period from time t9 to time t5 shown in FIG. 10, a second rim spouting is performed from the rim water outlet 8a, and a second rim flush is performed as the third flushing process.

[0076] As described above, the flush toilet 1 according to the embodiment is a flush toilet 1 that is flushed with flush water pressurized by a pressure pump 20, and comprises a toilet body 2 equipped with a water storage tank 18 that stores flush water, a bowl portion 6, a rim spout 8a and a jet spout 10a that spout flush water, and a drain trap pipe 12, a water supply passage 26 that enables flush water to be supplied from the water storage tank 18 to each of the rim spout 8a and the jet spout 10a, and a drain trap pipe 12 that is provided in the water supply passage 26 to supply flush water to the rim spout 8a and the jet The flush water dispenser includes a switching valve device 22 that switches water supply paths (rim water supply path 30, jet water supply path 32) that supply flush water to each of the rim water outlets 8a and the jet water outlets 10a, and an abnormality detection device 23 that detects a state in which flush water is not being discharged into the bowl section 6 when the pressure pump 20 is operating as an abnormality. The switching valve device 22 has a first switching valve body 33 for adjusting the amount of flush water from the rim water outlet 8a, and a second switching valve body 39 for adjusting the amount of flush water from the jet water outlet 10a. 9 is mechanically operated by the water pressure of flush water pressurized by the pressure pump 20, the first switching valve body 33 closes the rim water outlet 8a when the water pressure of the flush water is greater than a predetermined water pressure, and the second switching valve body 39 opens the jet water outlet 10a when the water pressure of the flush water is greater than a predetermined water pressure, and the switching valve device 22 is switched between a first flushing state in which the first switching valve body 33 is open and the second switching valve body 39 is closed, and a second flushing state in which the first switching valve body 33 is closed and the second switching valve body 39 is open. and if the abnormality detection device 23 detects an abnormality while the pressure pump 20 is maintaining the rotation speed N1 [rpm] for performing the first cleaning state, the pressure pump 20 increases the rotation speed N [rpm] to transition to the second cleaning state, and if the abnormality detection device 23 detects an abnormality while the pressure pump 20 is maintaining the rotation speed N2 [rpm] for performing the second cleaning state, the pressure pump 20 decreases the rotation speed N [rpm] to transition to the first cleaning state.

[0077] Even if a malfunction occurs in the first switching valve body 33 or the second switching valve body 39 and flush water is not supplied to the bowl portion 6, the flush toilet 1 responds to the malfunction by switching the flush state so that flush water is supplied to the bowl portion 6. In other words, the flush toilet 1 can prevent a state in which flush water is not discharged from either the rim spout 8a or the jet spout 10a. This allows the flush toilet 1 to prevent odors from leaking into the toilet space from the drain trap pipe 12 due to a water seal failure.

[0078] In addition, the second cleaning state has a second cleaning state under abnormal conditions in which the opening degree of the second switching valve body 39 is smaller than under normal conditions, and if the abnormality detection device 23 detects an abnormality while the pressure pump 20 is maintaining the rotation speed N1 [rpm] for performing the first cleaning state, the pressure pump 20 increases the rotation speed N [rpm] to transition to the second cleaning state under abnormal conditions.

[0079] Even if a malfunction occurs in the first switching valve body 33 during rim flushing and flush water is not supplied to the bowl section 6, the flush toilet 1 discharges flush water from the jet spout 10a with a weaker water force than normal. This allows the flush toilet 1 to prevent odors from the drain trap pipe 12 from leaking into the toilet space due to a broken water seal.

[0080] In addition, the rate at which the rotation speed N [rpm] of the pressurizing pump 20 decreases when the second switching valve body 39 is closing varies more slowly than the rate at which the rotation speed N [rpm] of the pressurizing pump 20 increases when the second switching valve body 39 is opening.

[0081] By suppressing pulsation caused by vibration when the second switching valve closes, the flush toilet 1 can prevent the first switching valve body 33 from sliding properly in the operating direction and failing to open. This allows the flush toilet 1 to prevent odors from leaking into the toilet space from the drain trap pipe 12 due to a water seal failure.

[0082] Furthermore, on the upstream side of the first switching valve body 33, a flow straightening member 45 that straightens the wash water flowing toward the first switching valve body 33 is provided.

[0083] For example, when the second switching valve body 39 closes forcefully, the flush toilet 1 can prevent the first switching valve body 33 from not sliding properly in the operating direction and not opening by suppressing pulsation caused by vibration during the second switching valve closing operation. This allows the flush toilet 1 to prevent odors from leaking from the drain trap pipe 12 into the toilet space due to a water seal failure.

[0084] The flow straightening member 45 is a flow straightening fin 46 having a shape that is curved so as to be convex inward in the flow path direction of the cleaning water.

[0085] The flush toilet 1 can guide flush water that gathers in the center of the flow path outward in the flow path direction. Therefore, the flush toilet 1 can prevent the first switching valve body 33 from sliding properly in the operating direction and not opening due to pulsation caused by, for example, the second switching valve body 39 closing forcefully. This allows the flush toilet 1 to prevent odors from leaking from the drain trap pipe 12 into the toilet space due to a water seal failure.

[0086] Furthermore, the first switching valve element 33 opens or closes as the first switching valve element 33 moves in the operating direction, and the first switching valve element 33 is provided with a guide member 47 that restricts movement of the first switching valve element 33 in the operating direction.

[0087] The flush toilet 1 can prevent uneven contact of the first switching valve body 33 with the first valve seat portion 36 when the first switching valve body 33 closes, and deviations in the closing time due to unstable operation of the first switching valve body 33. This allows the flush toilet 1 to more appropriately switch flush states.

[0088] Furthermore, times t0 to t9 and the rotation speeds N1 to N3 of the pressure pump 20 shown in FIG. 4 can be changed appropriately depending on the specifications of the flush toilet 1, and are not limited to these.

[0089] Note that, in the flush toilet 1 according to one embodiment of the present invention described above, a form in which only jet water spouting is performed in the second flushing process (jet flushing process) shown in FIG. 6 has been described as an example, but the present invention is not limited to this form, and both rim water spouting and jet water spouting may be performed in the second flushing process.

[0090] Further advantages and modifications may readily occur to those skilled in the art. Thus, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof.

[0091] <Additional Notes> (1) A flush toilet that is flushed with flush water pressurized by a pressure pump, A water storage tank for storing cleaning water; A bowl portion, a rim spout and a jet spout for spouting flush water, and a drain trap portion, A toilet body having the a water supply passage that enables flush water to be supplied from the water storage tank to each of the rim water outlet and the jet water outlet; A switching unit that is provided in the water supply passage and switches a water supply path that supplies flush water to each of the rim water outlet and the jet water outlet; an abnormality detection unit that detects a state in which flush water is not discharged to the bowl portion when the pressure pump is operating, The switching unit has a first switching valve body for adjusting the amount of flush water from the rim water spouting port, and a second switching valve body for adjusting the amount of flush water from the jet water spouting port, The first switching valve body and the second switching valve body are mechanically operated by receiving the water pressure of the wash water pressurized by the pressure pump, and the first switching valve body is in a state where it closes the rim water outlet when the water pressure of the wash water is greater than a predetermined water pressure, and the second switching valve body is in a state where it opens the jet water outlet when the water pressure of the wash water is greater than the predetermined water pressure, the switching unit has at least a first flushing state in which the first switching valve element is open and the second switching valve element is closed, and a second flushing state in which the first switching valve element is closed and the second switching valve element is open, When the abnormality detection unit detects an abnormality while the pressure pump maintains the rotation speed for performing the first cleaning state, the pressure pump increases the rotation speed to transition to the second cleaning state, a flush toilet in which, if the abnormality detection unit detects an abnormality while the pressure pump is maintaining the rotation speed for implementing the second flush state, the pressure pump reduces the rotation speed to transition to the first flush state. (2) The second cleaning state includes an abnormality second cleaning state in which an opening degree of the second switching valve body is smaller than that of a normal state, The flush toilet according to (1), wherein if the abnormality detection unit detects an abnormality while the pressure pump is maintaining the rotation speed for implementing the first flush state, the pressure pump increases its rotation speed to transition to the second flush state upon abnormality. (3) The flush toilet recited in (1) or (2), wherein the rate at which the rotation speed of the pressurizing pump decreases when the second switching valve body is performing a valve closing operation fluctuates more gradually than the rate at which the rotation speed of the pressurizing pump increases when the second switching valve body is performing a valve opening operation. (4) A flush toilet as recited in any one of (1) to (3), wherein a straightening member that straightens the flush water flowing toward the first switching valve body is provided upstream of the first switching valve body. (5) The flush toilet according to (4), wherein the flow straightening member is a flow straightening fin having a shape that is curved so as to be convex inward in the direction of the flow path of the flush water. (6) When the first switching valve element moves in an actuation direction, the first switching valve element opens or closes, The flush toilet according to any one of (1) to (5), wherein the first switching valve body is provided with a guide member that restricts movement so as to move in the operating direction. [Explanation of symbols]

[0092] 1 flush toilet 2 Toilet bowl body 6 Bowl section 8a Rim Spout 10a Jet outlet 12 Drain trap pipe (drain trap section) 18 Water Tank 20 Pressure Pump 23 Anomaly detection device (anomaly detection section) 26 Water supply channel 30 Rim water supply channel (water supply route) 32 Jet water supply line (water supply route) 33 First switching valve body 39 Second switching valve body 45 Straightening member 46 Straightening fin 47 Guide member C1 axis (operating direction) N Number of revolutions N1 Rotational Speed N2 Rotational Speed N3 Rotational Speed W1 Cleaning water

Claims

1. A flush toilet that is flushed with flush water pressurized by a pressure pump, A water storage tank for storing cleaning water; A bowl portion, a rim spout and a jet spout for spouting flush water, and a drain trap portion, A toilet body having the a water supply passage that enables flush water to be supplied from the water storage tank to each of the rim water outlet and the jet water outlet; A switching unit that is provided in the water supply passage and switches a water supply path that supplies flush water to each of the rim water outlet and the jet water outlet; an abnormality detection unit that detects a state in which flush water is not discharged to the bowl portion when the pressure pump is operating, The switching unit has a first switching valve body for adjusting the amount of flush water from the rim water spouting port, and a second switching valve body for adjusting the amount of flush water from the jet water spouting port, The first switching valve body and the second switching valve body are mechanically operated by receiving the water pressure of the wash water pressurized by the pressure pump, the first switching valve body closes the rim water outlet when the water pressure of the wash water is greater than a predetermined water pressure, and the second switching valve body opens the jet water outlet when the water pressure of the wash water is greater than the predetermined water pressure, the switching unit has at least a first cleaning state in which the first switching valve element is open and the second switching valve element is closed, and a second cleaning state in which the first switching valve element is closed and the second switching valve element is open, When the abnormality detection unit detects an abnormality while the pressure pump is maintaining the rotation speed for performing the first cleaning state, the pressure pump increases the rotation speed to transition to the second cleaning state, a flush toilet in which, if the abnormality detection unit detects an abnormality while the pressure pump is maintaining the rotation speed for implementing the second flush state, the pressure pump reduces the rotation speed to transition to the first flush state.

2. The second cleaning state includes an abnormality second cleaning state in which an opening degree of the second switching valve body is smaller than that in a normal state, 2. The flush toilet according to claim 1, wherein if the abnormality detection unit detects an abnormality while the pressure pump is maintaining the rotation speed for implementing the first flush state, the pressure pump increases its rotation speed to transition to the second flush state under abnormality.

3. 2. The flush toilet according to claim 1, wherein the rate at which the rotation speed of the pressurizing pump decreases when the second switching valve body is performing a valve closing operation fluctuates more gradually than the rate at which the rotation speed of the pressurizing pump increases when the second switching valve body is performing a valve opening operation.

4. The flush toilet according to claim 1, wherein a flow straightening member that straightens the flush water flowing toward the first switching valve body is provided upstream of the first switching valve body.

5. 5. The flush toilet according to claim 4, wherein the flow straightening member is a flow straightening fin having a shape that is curved so as to be convex inward in the direction of the flow path of the flush water.

6. When the first switching valve element moves in an actuation direction, the first switching valve element opens or closes, 2. The flush toilet according to claim 1, wherein the first switching valve body is provided with a guide member that restricts movement of the first switching valve body in the operating direction.

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