Flush toilet
The flushing toilet design addresses the challenge of preventing odor and foreign substance intrusion into the water storage tank by using a constant water level in the storage portion and a linked overflow passage, ensuring effective drainage and a compact, low-sill design.
Patent Information
- Application Number
- JP2022210446
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2022-12-27
- Publication Date
- 2025-06-26
- Estimated Expiration
- 2042-12-27
AI Technical Summary
Conventional flushing toilets face challenges in preventing the intrusion of odors and foreign substances from the overflow passage into the water storage tank, while also ensuring drainage performance and achieving a low-sill design.
The flushing toilet design includes a water storage tank with a storage portion that constantly stores washing water, connected to an overflow passage that links to a drainage passage downstream of a bent pipe with a water seal. This configuration ensures that odors and foreign matters are blocked by the water seal and the constant water level in the storage portion, while maintaining drainage performance.
This design effectively prevents the entry of odors and foreign substances into the water storage tank, ensures reliable drainage performance, and allows for a compact, low-sill toilet design by eliminating the need for additional channels and simplifying the overflow passage.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention relates to a flushing toilet, and more particularly to a flushing toilet that is washed with washing water and discharges dirt.
Background Art
[0002] Conventionally, as a flushing toilet that is washed with washing water and discharges dirt, for example, as described in Patent Documents 1 to 3, there are known ones including a water storage tank for storing washing water, a washing water supply flow path extending from this water storage tank to the toilet body, and an overflow flow path for overflowing the washing water when the washing water in the water storage tank exceeds a specified water level. First, in the conventional flushing toilet described in Patent Document 1 mentioned above, it includes a main water storage tank (lower tank) of the water storage tank, a water receiving part provided above this lower tank (upper part of the water storage tank), an overflow flow path (overflow pipe) connected to this water receiving part, and a storage part (trap) provided in this overflow pipe that can store a certain amount. Also, the washing water that overflows from the water receiving part of the water storage tank to the overflow flow path becomes full in the storage part to form water sealing, and the water sealing of this storage part blocks the flow path in the overflow flow path. As a result, odors and foreign matters (such as insects) that enter from the downstream side of the overflow pipe cannot enter the water storage tank. Next, in the conventional flushing toilet described in Patent Document 2 mentioned above, an overflow flow path (overflow bypass flow path) extending from the upper part of the water storage tank for storing washing water is connected to a drainage flow path on the downstream side of the part where water sealing is formed in the drainage trap pipe. This overflow flow path is provided with an odor backflow suppression part for suppressing the backflow of odors and the intrusion of pests, and by this odor backflow suppression part, the odor in the drainage flow path on the downstream side of the water sealing of the drainage trap pipe is suppressed from entering the water storage tank side through the overflow flow path. In addition, in the conventional flushing toilet described in Patent Document 3 mentioned above, the toilet body is provided with a sludge discharge passage for discharging uncured clay downward during its casting molding. This sludge discharge passage connects a water passage provided upstream of the water discharge hole of the toilet body and the water seal of the trap part for discharging dirt in the toilet bowl part, and the water seal of the trap part can prevent the backflow of odors from its downstream side.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Patent Document 2
Patent Document 3
Summary of the Invention
Problems to be Solved by the Invention
[0004] However, in the conventional flushing toilet described in Patent Document 1 mentioned above, since the storage part of the overflow flow path connected to the water receiving part of the water storage tank is provided above the lower tank that is constantly stored regardless of toilet flushing, there is a risk that the storage part of the overflow flow path will run dry (run out of water) unless the washing water in the water receiving part of the water storage tank overflows into the overflow flow path. Therefore, there is a problem that the water seal function of blocking the intrusion of odors and foreign substances from the downstream side in the overflow flow path may not be fulfilled. In recent years, there has been an increasing need for what is known as "low-sill toilets," in which the upper height position of the entire flushing toilet is set relatively low in order to improve design and usability for caregiving. However, in the conventional flushing toilet described in Patent Document 1 mentioned above, since the storage part of the overflow passage is connected to the water receiving part provided at the upper part of the water storage tank, it is provided above the flushing toilet and outside the water storage tank. Therefore, the upper height of the entire flushing toilet is set at a relatively high position, making it difficult to achieve a low-sill toilet and resulting in an increase in the overall size of the toilet. Furthermore, if the upper height position of the water storage tank is also set low in order to achieve a low-sill toilet for the entire flushing toilet, the height difference between the upper height of the water storage tank and the upper surface of the rim of the toilet body, the rim water outlet, etc. becomes smaller. Therefore, accordingly, the height difference between the water supply part (water supply port) for supplying washing water into the water storage tank and the overflow port of the water storage tank for overflowing the washing water in the water storage tank into the overflow passage also becomes smaller. As a result, there is a problem that it is difficult to secure a water supply space for supplying water into the water storage tank from the water supply port and a water discharge space for overflowing from the overflow port of the water storage tank. Also, in the conventional flushing toilet described in Patent Document 1 mentioned above, since a installation space for the storage part itself must be secured, the overflow passage becomes more complex accordingly, resulting in a problem of lower production yield. Next, in the conventional flushing toilet described in Patent Document 2 mentioned above, since the overflow passage is connected to the drainage passage on the downstream side of the part where the water seal is formed in the drainage trap pipe, depending on the connection location, there is a problem that the presence of the overflow passage may cause a decrease in the drainage performance of the drainage passage. Similarly, in the conventional flushing toilet described in Patent Document 3 mentioned above, depending on the connection location between the sludge discharge passage in the toilet body and the water seal of the trap part, there is a problem that the presence of the sludge discharge passage may cause a decrease in the drainage performance of the drainage passage.
[0005] Therefore, the present invention has been made to solve the above-described problems of the prior art, and an object thereof is to provide a flushing toilet that can reliably prevent the intrusion of odors, foreign substances, etc. from the overflow passage into the water storage tank while ensuring the drainage performance of the toilet.
Means for Solving the Problems
[0006] In order to solve the above-described problems, the present invention is a flushing toilet that is washed with washing water to discharge dirt, and includes a water storage tank that stores washing water, a bowl portion that receives dirt, a water discharge port that discharges washing water into the bowl portion, and a drainage trap portion that is connected to an inlet portion below the bowl portion and forms a part of a drainage passage that discharges dirt in the bowl portion. A toilet body, a washing water supply passage extending from the water storage tank to the toilet body, and an overflow passage that overflows the washing water when the washing water in the water storage tank exceeds a specified water level. The drainage trap portion includes a bent pipe passage that forms a drainage passage that descends to the lowermost end portion behind and below the inlet portion and then rises to the top portion behind and above it, and a descending pipe passage that forms a drainage passage that descends from the top portion of the bent pipe passage behind and below. The bent pipe passage on the upstream side of the top portion has a water seal formed therein. The overflow passage is provided so as to connect the water storage tank and a drainage passage on the downstream side of the bent pipe passage where the water seal is formed. The water storage tank is characterized by including a storage portion provided in a part thereof and storing washing water constantly regardless of toilet washing, and a connection passage provided on the upstream side of the overflow passage and connecting the storage portion and the overflow passage. In the present invention configured as described above, since the overflow passage is provided so as to connect the water storage tank and a drainage passage on the downstream side of the bent pipe passage where the water seal of the drainage trap portion is formed, odors, foreign substances, etc. may enter the overflow passage from the drainage passage on the downstream side of the bent pipe passage of the drainage trap portion. However, according to the present invention, when cleaning water is supplied into the water storage tank every time the toilet is cleaned, the cleaning water is also replenished in the storage part which is a part of the water storage tank. Therefore, in the storage part, the cleaning water is always stored (in a state where it does not run dry) regardless of the toilet cleaning. Therefore, even when odors or foreign matters in the drainage channel attempt to enter the storage part through the connection channel of the upstream water storage tank from the overflow channel, the cleaning water in the storage part can surely prevent the entry of odors or foreign matters. In addition, since the storage part is provided as a part of the water storage tank, it is not necessary to provide the storage part in the overflow channel, and the complication of the overflow channel can be suppressed. Also, since it is not necessary to provide a channel for supplying cleaning water to the storage part at a location related to drainage performance (such as a drainage trap part), the drainage performance can be ensured. Thus, for a storage part that does not run dry and can suppress odors or foreign matters flowing upstream from the drainage trap part, it can be provided while securing a water discharge space for cleaning water to cause an overflow from the water storage tank without providing an extra channel for supplying cleaning water at a location related to drainage capacity. Furthermore, since the storage part where cleaning water is always stored regardless of toilet cleaning is provided as a part of the water storage tank, compared to the case where the storage part is provided separately from the water storage tank, the occupied space of the entire water storage tank can be suppressed, and the toilet can be made more compact. As a result, while ensuring the drainage performance of the toilet, it is possible to surely prevent the entry of odors or foreign matters from the overflow channel into the water storage tank.
[0007] In the present invention, preferably, the water storage tank further includes a water storage tank main body provided therein with the storage portion. The storage portion is partitioned by a partition wall into an inner region of the storage portion where washing water is always stored regardless of the toilet washing state and an outer region of the storage portion outside thereof. The storage portion also includes a side wall that forms a part of the inner region of the storage portion and has an outlet for allowing the washing water in the inner region of the storage portion to flow out into the connection flow path. The outer region of the storage portion is connected to the washing water supply flow path. The upper end of the partition wall is located below the water stop level in the water storage tank main body before the start of toilet washing and above the upper end of the outlet. In the present invention configured as described above, since the upper end of the partition wall in the storage portion of the water storage tank is located below the water stop level in the water storage tank main body before the start of toilet washing and above the upper end of the outlet of the side wall of the storage portion, when the toilet washing is started, the water level of the washing water in the water storage tank main body drops from the water stop level to the height position of the upper end of the partition wall. Then, when the toilet washing continues further, only the washing water in the outer region of the storage portion of the water storage tank flows out from the washing water supply flow path to the toilet main body side, so the water level of the washing water in the outer region of the storage portion drops until the toilet washing ends. On the other hand, regarding the washing water in the storage portion of the water storage tank connected to the connection flow path on the upstream side of the overflow flow path, since the upper end of the partition wall of the storage portion is located above the upper end of the outlet of the side wall, the stored state (a state where water does not run out) is maintained regardless of the toilet washing. Thereby, while ensuring the toilet washing performance, it is possible to reliably prevent odors, foreign matters, etc. that attempt to mix into the storage portion from the overflow flow path through the connection flow path of the water storage tank on its upstream side.
[0008] In the present invention, preferably, the overflow flow path is provided with a check valve for preventing the backflow of washing water from the overflow flow path into the connection flow path, the mixing of odors, or the intrusion of foreign matters such as insects. In the present invention configured as described above, by providing a check valve in the overflow flow path, this check valve can surely prevent the backflow of cleaning water from the drainage flow path into the overflow flow path, the mixing of odors, or the intrusion of foreign matters such as insects. Therefore, it is possible to prevent the cleaning water in the water storage tank on the upstream side of the overflow flow path from being contaminated. Also, by simply providing a check valve in the overflow flow path, the complication of the overflow flow path can be suppressed.
[0009] In the present invention, preferably, further, it has a drain socket that forms a drainage flow path on the downstream side of the descending pipe of the above drainage trap, and this drain socket is provided with a drainage unit to which the above overflow flow path is connected, and this drainage unit forms a part of the above overflow flow path and is provided with the above check valve inside. In the present invention configured as described above, by connecting the overflow flow path to the drainage unit of the drain socket that is easy to handle outside the toilet body, the upper end height of the entire flush toilet can be suppressed, so that a low-sill toilet can be realized. Also, by connecting the overflow flow path to the drain socket on the downstream side of the drainage trap portion of the toilet body, the cleaning water from the overflow flow path can be made to flow out into the downstream drainage flow path that has relatively little influence on the drainage performance, so that the drainage performance can be ensured.
[0010] In the present invention, preferably, the above drainage unit is arranged above the center position of the flow path cross-section of the above drainage flow path formed by the above drain socket, and is provided with a connection portion that connects the above overflow flow path and the above connection flow path, and this connection portion is arranged above the water stop level in the above water storage tank. In the present invention configured as described above, the drainage unit is disposed above the central position of the flow path cross-section of the drainage flow path formed by the drainage socket, and the connection portion connecting the overflow flow path in the drainage unit and the connection flow path of the water storage tank is disposed above the water stop level in the water storage tank. As a result, the drainage unit can be disposed at a location in the drainage socket where it is difficult for the washing water to pass through, so that the drainage performance can be ensured.
[0011] In the present invention, preferably, the check valve has a float structure that moves up and down according to the water level in the drainage unit. In the present invention configured as described above, since the check valve has a float structure that moves up and down according to the water level in the drainage unit, it is not necessary to electrically control the opening and closing operation of the check valve, etc. Even when the washing water overflows from the overflow flow path during a power outage, the check valve with the float structure can be surely operated. Therefore, the overflowed washing water can be surely discharged from the drainage flow path. Also, due to the float structure of the check valve, the entire check valve can have a simple structure and the occupied space can be suppressed, so that the storage space for the peripheral devices of the drainage unit can be ensured.
[0012] In the present invention, preferably, the drainage socket has a fixing portion that fixes the drainage socket so as not to rotate with respect to the toilet body in the circumferential direction around the center of the flow path cross-section of the drainage flow path. In the present invention configured as described above, the fixing portion of the drainage socket can surely fix the drainage socket so as not to rotate with respect to the toilet body in the circumferential direction around the center of the flow path cross-section of the drainage flow path. Therefore, an appropriate operation of the float structure of the check valve in the drainage unit of the drainage socket can be realized.
[0013] In the present invention, preferably, the flushing toilet is a wall-mounted flushing toilet in which the toilet body is fixed to a wall or a cabinet located behind it. In the present invention configured as described above, even in the case of a wall-mounted flush toilet where it is difficult to engage with the wall behind the toilet body or the fixing means between the cabinet and the toilet body, it is possible to achieve a low siphon of the toilet while ensuring the overflow performance of the washing water from the overflow channel.
Effect of the Invention
[0014] According to the flush toilet of the present invention, while ensuring the drainage performance of the toilet, it is possible to reliably prevent the entry of odors or foreign substances from the overflow channel into the water storage tank.
Brief Description of the Drawings
[0015]
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Embodiments for Carrying Out the Invention
[0016] Hereinafter, a flush toilet according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an overall configuration diagram of a flush toilet according to an embodiment of the present invention. First, as shown in FIG. 1, a flush toilet 1 according to an embodiment of the present invention is a so-called "wall-mounted flush toilet" in which the rear part of its toilet body 2 is fixed to the wall W of the toilet room T (or the front wall W of the cabinet C). Further, as shown in FIG. 1, the wall-mounted flushing toilet 1 of the present embodiment includes a toilet bowl body 2 made of pottery, a tank device 6 having a water storage tank 4 for storing the flushing water supplied to the toilet bowl body 2, and a pump device 8 provided on the downstream side of the tank device 6 and pressurizing the flushing water supplied from the water storage tank 4 to supply it to the toilet bowl body 2.
[0017] Next, FIG. 2 is a plan view of a flushing toilet according to an embodiment of the present invention. Further, FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2. As shown in FIGS. 1 to 3, the water storage tank 4 of the tank device 6 includes a main tank 4a incorporated below the toilet bowl body 2, an auxiliary tank 4b incorporated behind and above the toilet bowl body 2, and a connecting pipe 4c extending in the vertical direction and connecting the main tank 4a and the auxiliary tank 4b. These main tank 4a and auxiliary tank 4b communicate with each other in the vertical direction through the connecting pipe 4c. Furthermore, the pump device 8 is incorporated inside the toilet bowl body 2 and communicates with the main tank 4a of the water storage tank 4.
[0018] Next, as shown in FIGS. 1 to 3, the toilet bowl body 2 specifically includes a bowl portion 14 including a waste receiving surface 10 for receiving waste and a rim portion 12 formed at the upper edge of the waste receiving surface 10. The toilet bowl body 2 also includes a drain trap portion 16 forming a drain flow path for discharging the waste in the bowl portion 14, and a skirt portion 18 formed so as to surround the bowl portion 14 and the drain trap portion 16 from the outside. Here, the skirt portion 18 is not limited to a ceramic skirt portion formed integrally with the toilet bowl body 2, and also includes a panel member or the like provided separately from the toilet bowl body 2 and removably attached so as to cover the toilet bowl body 2 from the outside.
[0019] Next, as shown in FIGS. 1 to 3, the drain trap portion 16 more specifically includes a bent pipe line 16a and a descending pipe line 16b from the upstream side to the downstream side. First, in the bent pipe 16a of the drain trap section 16, the inlet section 16c is connected below the bowl section 14, and forms a drain channel that extends from this inlet section 16c to the lowermost end section 16d at the rear and below, and then rises to the top section 16e at the rear and above. Next, the flushing toilet 1 of the present embodiment includes a drain socket 20 connected to the downstream side (rear side) of the drain trap section 16. The descending pipe 16b of the drain trap section 16 forms a drain channel that descends from the top section 16e of the bent pipe 16a to the rear and below, and then is connected to the drain socket 20 on the rear side (downstream side).
[0020] Here, as shown in FIG. 1, a water seal (water seal surface WL0) is formed in the region on the upstream side (front side) of the top section 16e in the bent pipe 16a of the drain trap section 16. Furthermore, as shown in FIG. 1, a drain pipe 22 is installed on the back side (or inside the cabinet C) of the wall W behind the toilet body 2. This drain pipe 22 extends upward from below the floor surface F and then is directed toward the toilet body 2 side (front side), and the inlet section 22a located at the front end (upstream end) thereof is connected to the outlet section 16f at the rear end (downstream end) of the drain trap section 16 via the drain socket 20.
[0021] Next, as shown in FIGS. 1 to 3, the tank device 6 includes a water supply pipe 24 connected to the upstream side of the auxiliary tank 4b of the water storage tank 4. The most upstream side of this water supply pipe 24 is connected to an external water supply source 26 such as a water supply (see FIG. 1). Also, as shown in FIG. 1, in the water supply pipe 24, a stop valve 28 and a valve unit 30 are respectively provided from the water supply source 26 side (upstream side) toward the downstream side. Although a specific description of this valve unit 30 is omitted, it includes a constant flow valve (not shown), a diaphragm valve (not shown) which is an on-off valve provided on the downstream side of this constant flow valve (not shown), and a solenoid valve (not shown) for opening and closing this on-off valve (diaphragm valve), etc. Furthermore, as shown in FIGS. 1 to 3, a water supply nozzle 24a is provided at the downstream end of the water supply pipe 24. This water supply nozzle 24a is directed downward toward the inside of the auxiliary tank 4b of the water storage tank 4, and serves as a water supply section for supplying the cleaning water in the water supply pipe 24 into the water storage tank 4. For example, when a diaphragm valve (not shown) is opened by the operation of a solenoid valve (not shown) of the valve unit 30, the cleaning water supplied into the water supply pipe 24 at the water supply pressure from a water supply source 26 such as a water supply passes through a constant flow rate valve (not shown) of the valve unit 30 from the stop valve 28, and then the flow rate is adjusted to be constant and passes through the diaphragm valve (not shown). Then, the cleaning water that has passed through the valve unit 30 is supplied into the auxiliary tank 4b of the water storage tank 4 from the water supply nozzle 24a, and then is supplied into the main tank 4a through the connecting pipe 4c.
[0022] Incidentally, the cleaning water supplied into the main tank 4a is supplied to the toilet body 2 side when the pump device 8 operates. More specifically, as shown in FIGS. 1 and 2, the toilet body 2 is provided with two rim water discharge ports 2a and 2b (the first rim water discharge port 2a and the second rim water discharge port 2b) provided on the left and right rim portions 12 thereof, respectively, and water discharge (rim water discharge) is performed from each of the rim water discharge ports 2a and 2b into the bowl portion 14. Also, as shown in FIGS. 1 to 3, a discharge pipe 32 is connected to the downstream side of the pump device 8, and the downstream end of this discharge pipe 32 is connected to the inlet 2d of the main water passage 2c of the toilet body 2. Furthermore, the main water passage 2c of the toilet body 2 is provided with two rim water passages 2e and 2f (the first rim water passage 2e and the second rim water passage 2f) whose downstream sides are branched left and right, and the downstream sides of each of the rim water passages 2e and 2f are connected to the first rim water discharge port 2a and the second rim water discharge port 2b, respectively. As shown in FIGS. 1 and 2, in the flushing toilet 1 of the present embodiment, for each of the flow path F1 extending from the first outlet 4e of the side wall 4d in the main tank 4a of the water storage tank 4 of the tank device 6 to the pump device 8, and the flow path F2 extending from this pump device 8 through the discharge pipe 32 to the inlet 2d of the main water conduit 2c of the toilet body 2, it is a cleaning water supply flow path for supplying the cleaning water W1 for toilet flushing to the toilet body 2.
[0023] Next, as shown in FIGS. 1 to 3, the water storage tank 4 further includes a second outlet 4f provided separately from the first outlet 4e in a part of the side wall 4d on the rear side of the main tank 4a, and a connection flow path 4g extending downstream from this second outlet 4f and connected to a drainage unit 36 (details will be described later) of an overflow flow path 34 (details will be described later). Details of the internal structure of the main tank 4a to which the connection flow path 4g of the water storage tank 4 is connected will be described later. Regarding the overflow flow path 34, in the event of an abnormality such as a malfunction of the tank device 6 or a stop due to a power failure, when the cleaning water in the main tank 4a of the water storage tank 4 exceeds a specified water level (overflow water level WL1), the cleaning water W2 flowing out from the second outlet 4f of the side wall 4d on the rear side of the main tank 4a through the connection flow path 4g into the overflow flow path 34 is directly passed (overflowed) from the drainage unit 36 to the drainage flow path F3 in the drainage socket 20. It is a flow path for this purpose.
[0024] Next, the flushing toilet 1 of the present embodiment includes a controller (not shown) that controls the operation of the pump device 8, and this controller (not shown) is arranged in a part of the toilet body 2. The tank device 6 also includes a float switch (not shown) for detecting the water level inside the main tank 4a. Here, the opening and closing operation of the solenoid valve (not shown) of the valve unit 30 is controlled by the controller (not shown) based on the water level inside the main tank 4a detected by the float switch (not shown). Also, the operation of the pump device 8 is also controlled by a controller (not shown) based on the water level in the main tank 4a detected by a float switch (not shown). For example, when the water level in the main tank 4a detected by the float switch (not shown) is below a predetermined level, the solenoid valve (not shown) of the valve unit 30 opens and the diaphragm valve (not shown) of the valve unit 30 opens, thereby opening the water supply pipe 24 and supplying water from the water supply nozzle 24a to the auxiliary tank 4b of the water storage tank 4. The cleaning water in this auxiliary tank 4b is stored in the main tank 4a through the connecting pipe 4c. At the same time, the pump device 8 operates, and the cleaning water in the main tank 4a is pumped from the pump device 8 through the discharge pipe 32 to the main water passage 2c of the toilet body 2, and then supplied from each rim water passage 2e, 2f to each rim discharge port 2a, 2b. As a result, toilet cleaning is performed by the rim discharge water discharged from each rim discharge port 2a, that is, so-called "toilet cleaning by 100% rim discharge". When the water level in the main tank 4a reaches a predetermined level, the solenoid valve (not shown) of the valve unit 30 closes and the diaphragm valve (not shown) closes, thereby closing the water supply pipe 24 and stopping the pump device 8.
[0025] Next, with reference to FIGS. 1 to 6, the internal structure of the main tank 4a to which the connection flow path 4g in the water storage tank 4 of the flush toilet 1 of the present embodiment is connected, and the details of the internal structure of the overflow flow path 34 and its drainage unit 36 will be described. FIGS. 4 and 5 respectively show a cross-sectional view taken along line IV-IV of FIG. 3 and a cross-sectional view taken along line V-V of FIG. 3. FIG. 6 is a schematic cross-sectional perspective view schematically showing the inside of the drainage unit of the drainage socket of the flush toilet according to an embodiment of the present invention. First, as shown in FIGS. 1 to 5, the main tank 4a of the water storage tank 4 further includes a water storage tank body 38 that forms its main body, and a storage portion 40 provided in a part of the water storage tank body 38 where washing water is constantly stored regardless of toilet bowl washing. Also, the storage portion 40 includes a partition wall 42 provided so as to extend upward from the bottom surface in the water storage tank body 38. This partition wall 42 serves as a partition wall that divides the inner region A1 of the storage portion where washing water is constantly stored regardless of the toilet bowl washing state and the outer region A2 of the storage portion outside thereof. Further, as shown in FIG. 1, the first outlet 4e of the main tank 4a is provided on the side wall 4d that forms the outer region A2 of the storage portion in the water storage tank body 38. Thereby, the outer region A2 of the storage portion communicates with a washing water supply flow path (flow path F1) extending from the first outlet 4e to the pump device 8. Here, the upper end 42a of the partition wall 42 in the storage portion 40 provided in the water storage tank body 38 is set below the water stop level WL2 before the start of toilet bowl washing, which is lower than the overflow water level WL1 in the water storage tank body 38, and is set at a height above the upper end of the second outlet 4f of the main tank 4a.
[0026] Next, as shown in FIGS. 1 to 5, the connection flow path 4g of the water storage tank 4 extends rearward from the second outlet 4f provided on the side wall 4d on the rear side of the main tank 4a, and then bends upward and extends to the upper drainage unit 36. Also, the drainage unit 36 of the overflow flow path 34 is provided above the overflow water level WL1 of the main tank 4a and above the upper end of the water storage tank body 38. Further, the inside of the drainage unit 36 forms a part of the overflow flow path 34, and the upper end (downstream end) of the connection flow path 4g of the water storage tank 4 connected to this drainage unit 36 serves as the overflow port 4h. Here, the drainage unit 36 of the overflow flow path 34 includes a connection portion 36a that connects the overflow flow path 34 and the connection flow path 4g, and this connection portion 36a is arranged above the water stop level WL2 in the main tank 4a of the water storage tank 4. As a result, the upstream end of the overflow channel 34 is connected to the downstream end (overflow port 4h) of the connection channel 4g of the water storage tank 4 as the connection portion 36a of the drainage unit 36. On the other hand, the downstream end of the overflow channel 34 is connected to the drainage channel F3 in the drainage socket 20 on the downstream side of the bent pipe 16a and the descending pipe 16b of the drainage trap portion 16 where the water seal (water seal surface WL0) is formed.
[0027] Next, as shown in FIG. 3, the drainage socket 20 is provided with a fixing portion 20a that fixes it so as not to rotate in the circumferential direction with respect to the toilet body 2 around the center O of the cross-section of its drainage channel F3. This fixing portion 20a forms a pair of left and right protrusions that protrude downward from the lower end of the drainage socket 20, and sandwiches the engagement protrusion 2g that is integrally provided on a part of the rear side of the toilet body 2 and extends in the vertical direction from both the left and right sides. As a result, the drainage socket 20 is fixed so as not to rotate with respect to the toilet body 2.
[0028] Further, the drainage unit 36 of the overflow channel 34 is fixed to the drainage socket 20, forms a part of the drainage socket 20, and is disposed above the center O of the cross-section of the drainage channel F3 that extends in the front-rear direction in the drainage socket 20 (see FIG. 3) and the central axis C1 of the drainage channel F3 passing through this center O (see FIG. 5). Furthermore, as shown in FIGS. 1, 3, and 5, the drainage unit 36 of the overflow channel 34 is provided with a check valve 44 inside it. By this check valve 44, it is possible to prevent the backflow of the washing water from the overflow channel 34 side to the connection channel 4g of the water storage tank 4, as well as the mixing of odors and the intrusion of foreign matters such as insects.
[0029] FIG. 6 is a schematic cross-sectional perspective view schematically showing the inside of the drainage unit of the drainage socket of the flush toilet according to an embodiment of the present invention. As shown in FIGS. 3, 5, and 6, the check valve 44 provided inside the drain unit 36 includes a guide wall portion 44a that extends downward from the top surface inside the drain unit 36, and a valve body 44b that is attached so as to be slidable in the vertical direction with respect to the guide wall portion 44a and moves up and down according to the water level WL3 inside the drain unit 36. Further, the valve body 44b of the check valve 44 has a generally cup shape with an open upper end portion, and has a float structure that moves up and down according to the water level WL3 inside the drain unit 36. Accordingly, during normal toilet flushing (when there is no overflow), the flushing water inside the drain unit 36 is empty, and since no buoyancy acts on the valve body 44b of the check valve 44, the overflow port 4h is closed with the valve body 44b lowered to the lowest position. On the other hand, in the event of an abnormality such as a malfunction of the tank device 6 or a stop due to a power failure, when the flushing water in the main tank 4a of the water storage tank 4 exceeds a specified water level (overflow water level WL1), the flushing water W2 in the storage portion 40 of the water storage tank main body 38 flows out from the second outlet 4f of the main tank 4a, passes through the connection flow path 4g, and flows into the drain unit 36 of the overflow flow path 34 as overflow flushing water W2 from the overflow port 4h. As a result, for the valve body 44b of the check valve 44 inside the drain unit 36, buoyancy f due to the overflow flushing water W2 inside the drain unit 36 is generated, so that the valve body 44b rises along the guide wall portion 44a, and the overflow port 4h is opened. Therefore, the connection flow path 4g of the water storage tank 4 communicates with the overflow flow path 34 on the downstream side of the valve body 44b of the check valve 44, and the overflow flushing water W2 that has flowed into the drain unit 36 from the overflow port 4h is discharged from the overflow flow path 34 into the drain flow path F3 inside the drain socket 20.
[0030] Next, with reference to FIGS. 1 to 6, the operation of the flush toilet 1 according to the above-described embodiment of the present invention will be described. First, according to the flushing toilet 1 according to an embodiment of the present invention, the overflow channel 34 is provided so as to connect the water storage tank 4 and the drainage channel F3 in the drainage socket 20 on the downstream side of the bent pipe 16a and the downward pipe 16b where the water seal (water seal surface WL0) of the drainage trap portion 16 is formed. As a result, foreign matters such as odors and insects may enter the overflow channel 34 from the drainage channel F3 in the drainage socket 20 on the downstream side of the bent pipe 16a and the downward pipe 16b of the drainage trap portion 16. However, according to the present embodiment, when washing water is supplied into the water storage tank 4 every time the toilet is washed, the washing water is also replenished in the storage portion 40 of the main tank 4a which is a part of the water storage tank 4. Therefore, in the storage portion 40, the washing water is always stored regardless of the toilet washing (the state where the water does not run out). Therefore, even when odors and foreign matters in the drainage channel F3 in the drainage socket 20 try to enter the storage portion 40 from the overflow channel 34 through the connection channel 4g of the water storage tank 4 on its upstream side, the washing water in the storage portion 40 can surely prevent the entry of odors and foreign matters. In addition, since the storage portion 40 is provided as a part of the main tank 4a of the water storage tank 4, it is not necessary to provide the storage portion 40 in the overflow channel 34, and the complication of the overflow channel 34 can be suppressed. At the same time, since it is not necessary to provide a channel for supplying washing water to the storage portion 40 at a location related to the drainage performance (such as the drainage trap portion 16), the drainage performance can be ensured. Thus, for the storage portion 40 that can suppress odors and foreign matters flowing upstream from the drainage trap portion 16 and does not run out of water, without providing an extra channel for supplying washing water at a location related to the drainage capacity (such as the drainage trap portion 16), it is possible to provide while securing a water discharge space for washing water (space required for the overflow channel 34, the drainage unit 36, etc.) for causing an overflow from the water storage tank 4. Furthermore, since the storage section 40 in which the washing water is constantly stored regardless of toilet bowl washing is provided in a part of the main tank 4a of the water storage tank 4, the occupied space of the entire water storage tank 4 can be suppressed compared to the case where the storage section 40 is provided separately from the main tank 4a of the water storage tank 4, and the low silhouette of the washlet toilet 1 can be realized. As a result, while ensuring the drainage performance of the washlet toilet 1, it is possible to reliably prevent the intrusion of odors, foreign matters, etc. from the overflow passage 34 into the water storage tank 4.
[0031] Also, according to the washlet toilet 1 according to the present embodiment, the upper end 42a of the partition wall 42 in the storage section 40 of the main tank 4a of the water storage tank 4 is located below the water stop level WL2 in the water storage tank main body 38 before the start of toilet bowl washing, and is located above the upper end of the second outlet 4f of the side wall 4d of the storage section 40. Therefore, when the toilet bowl washing is started, the water level of the washing water in the water storage tank main body 38 drops from the water stop level WL2 to the height position of the upper end 42a of the partition wall 42. Then, when the toilet bowl washing is further continued, only the washing water in the outer region A2 of the storage section of the main tank 4a of the water storage tank 4 flows out from the first outlet 4e to the toilet bowl main body 2 side through the washing water supply passages F1 and F2. Therefore, the water level of the washing water in the outer region A2 of the storage section drops until the toilet bowl washing is completed. On the other hand, regarding the washing water in the storage section 40 connected to the connection passage 4g of the water storage tank 4 on the upstream side of the overflow passage 34, since the upper end 42a of the partition wall 42 of the storage section 40 is located above the upper end of the second outlet 4f of the side wall 4d, the stored state (a state where water does not run out) is maintained regardless of toilet bowl washing. Thus, while ensuring the toilet bowl washing performance, it is possible to reliably prevent odors, foreign matters, etc. that attempt to enter the storage section 40 from the overflow passage 34 through the connection passage 4g of the water storage tank 4 on the upstream side thereof.
[0032] Furthermore, according to the flushing toilet 1 of the present embodiment, by providing the check valve 44 in the overflow passage 34, the check valve 44 can surely prevent the backflow of the washing water from the drainage passage F3 in the drainage socket 20 into the overflow passage 34, the intrusion of odors, and the intrusion of foreign matters such as insects. Therefore, it is possible to prevent the washing water in the water storage tank 4 on the upstream side of the overflow passage 34 from being contaminated. In addition, by simply providing the check valve 44 in the overflow passage 34, the complication of the overflow passage 34 can be suppressed.
[0033] Moreover, according to the flushing toilet 1 of the present embodiment, by connecting the overflow passage 34 to the drainage unit 36 of the drainage socket 20 that is easily accessible outside the toilet body 2, the overall upper end height of the flushing toilet 1 can be suppressed, so that a low-sill toilet can be realized. In addition, by connecting the overflow passage 34 to the drainage socket 20 on the downstream side of the drainage trap portion 16 of the toilet body 2, the washing water W3 from the overflow passage 34 can be made to flow out into the drainage passage F3 in the drainage socket 20 on the downstream side, which has relatively little influence on the drainage performance, so that the drainage performance can be ensured.
[0034] Furthermore, according to the flushing toilet 1 of the present embodiment, the drainage unit 36 is arranged above the position of the center O of the cross-sectional area of the drainage passage F3 formed by the drainage socket 29, and the connecting portion 36a connecting the overflow passage 34 and the connecting passage 4g of the water storage tank 4 in the drainage unit 36 is arranged above the water stop level WL2 in the main tank 4a of the water storage tank 4. By doing so, the drainage unit 36 can be arranged at a location in the drainage socket 20 where the washing water hardly passes, so that the drainage performance of the flushing toilet 1 can be ensured.
[0035] In addition, according to the flush toilet 1 of the present embodiment, since the check valve 44 has a float structure that moves up and down according to the water level WL3 in the drainage unit 36, it is not necessary to electrically control the opening and closing operation of the check valve 44, etc. Even when the washing water overflows from the overflow channel 34 during a power outage, the check valve 44 with the float structure can be surely operated. Therefore, the overflowed washing water W2 can be surely discharged from the drainage channel F3 in the drainage socket 20. In addition, due to the float structure of the check valve 44, the entire check valve 44 can have a simple structure and the occupied space can be suppressed, so that the storage space for the peripheral devices of the drainage unit 36 can be secured.
[0036] Furthermore, according to the flush toilet 1 of the present embodiment, the fixing portion 20a of the drainage socket 20 can surely fix the drainage socket 20 so as not to rotate with respect to the toilet body 2 in the circumferential direction about the center O of the flow path cross section of its drainage channel F3. Therefore, the proper operation of the float structure of the check valve 44 in the drainage unit 36 of the drainage socket 20 can be realized.
[0037] In addition, according to the flush toilet 1 of the present embodiment, even in the case of a wall-mounted flush toilet 1 where it is difficult to engage with the wall W behind the toilet body 2 or the cabinet C and the toilet body 2 by fixing means or the like, while achieving the low siphon of the flush toilet 1, the overflow performance of the washing water W2 from the overflow channel 34 can be ensured.
[0038] In the flush toilet 1 according to the above-described embodiment of the present invention, the form of a so-called "wall-mounted flush toilet" in which the rear part of the toilet body 2 is fixed to the wall W (or the front wall W of the cabinet C) of the toilet room T and is disposed above the floor surface F has been described. However, the present invention is not limited to such a form, and the present invention is also applicable to a form of a so-called "floor-mounted flush toilet" in which the toilet body 2 is disposed on the floor surface F. In addition, in the flushing toilet 1 according to one embodiment of the present invention described above, the so-called "toilet bowl cleaning by 100% rim water discharge" is executed only by the rim water discharge from each rim water discharge port 2a, 2b of the toilet bowl main body 2. However, the so-called "toilet bowl cleaning by rim-jet cleaning", which combines the rim water discharge from the rim water discharge port of the toilet bowl main body 2 and the water discharge (jet water discharge) that jets the cleaning water from the jet water discharge port provided below and in front of the bowl portion 14 toward the inlet portion 16c of the rear drain trap portion 16, is also applicable. Furthermore, in the flushing toilet 1 according to one embodiment of the present invention described above, by providing a storage portion 40 in a part of the main tank 4a of the water storage tank 4 where the cleaning water is constantly stored regardless of toilet bowl cleaning, even when odors, foreign matters, etc. in the drain flow path F3 in the drain socket 20 try to mix into the storage portion 40 through the connection flow path 4g of the water storage tank 4 on the upstream side from the overflow flow path 34, the cleaning water in the storage portion 40 can surely prevent the mixing of odors, foreign matters, etc. However, a check valve or the like may be provided instead of the storage portion 40.
Explanation of Signs
[0039] 1 Flushing toilet according to one embodiment of the present invention 2 Toilet bowl main body 2a First rim water discharge port 2b Second rim water discharge port 2c Main water conduit 2d Inlet of the main water conduit 2e First rim water conduit 2f Second rim water conduit 2g Engagement protrusion 4 Water storage tank 4a Main tank 4b Auxiliary tank 4c Connecting pipe 4d Side wall of the main tank, side wall on the rear side of the main tank 4e First outlet 4f Second outlet 4g Connecting flow path 4h Upper end of the connecting flow path, downstream end of the connecting flow path, overflow port 6 Tank device 8 Pump device 10 Dirt receiving surface 12 Rim part 12a Upper surface of the rim part 14 Bowl part 14a Rear wall of the bowl part 14b Outlet part of the bowl part 16 Drain trap part (drainage channel) 16a Bent pipe section of the drain trap part 16b Downward pipe section of the drain trap part 16c Inlet part of the bent pipe section of the drain trap part 16d Lowest end part of the bent pipe section of the drain trap part 16e Top part of the bent pipe section of the drain trap part 16f Outlet part of the drain trap part 18 Skirt part 20 Drain socket 20a Fixed part 22 Drain pipe 22a Inlet part of the drain pipe 24 Water supply pipe 24a Water supply nozzle 26 Water supply source 28 Stopcock 30 Valve unit 32 Discharge pipe 34 Overflow channel 36 Drain unit 36a Connection part between the drain unit and the connection channel of the water storage tank 38 Water storage tank body 40 Storage part 42 Partition wall 42a Upper end of the partition wall 44 Check valve 44a Guide wall part 44b Valve body A1 Inner region of the storage part A2 Outer region of the storage part C Cabinet C1 Central axis line of the drainage channel extending in the front - rear direction inside the drain socket F Floor surface A flow path (cleaning water supply flow path) extending from the first outlet of the side wall in the main tank of the water storage tank 4 of the F1 tank device to the pump device A flow path (cleaning water supply flow path) extending from the pump device through the discharge pipe to the inlet of the main water passage of the toilet body The drainage flow path in the drainage socket f Buoyancy O The center of the cross-section of the drainage flow path in the drainage socket T Toilet compartment W The wall of the toilet compartment or the front wall of the cabinet W1 Cleaning water for toilet cleaning W2 Overflow cleaning water WL0 Sealing water level WL1 Overflow water level of the main tank WL2 Water stop level of the main tank before starting toilet cleaning WL3 Water level in the drainage unit
Claims
1. A flushing toilet that is washed with flushing water to discharge dirt, a water storage tank for storing flushing water, a bowl part for receiving dirt, a water discharge port for discharging flushing water into the bowl part, and a drainage trap part that is connected to an inlet part below the bowl part and forms a part of a drainage channel for discharging the dirt in the bowl part, and a toilet body provided with the same, a flushing water supply channel extending from the water storage tank to the toilet body, an overflow channel for overflowing the flushing water when the flushing water in the water storage tank exceeds a specified water level, the drainage trap part includes a bent pipe channel that forms a drainage channel that descends to the lowermost end part behind and below the inlet part and then rises to the top part behind and above it, and a descending pipe channel that forms a drainage channel that descends from the top part of the bent pipe channel behind and below, and a water seal is formed in the bent pipe channel on the upstream side of the top part, the overflow channel is provided so as to connect the water storage tank and a drainage channel on the downstream side of the bent pipe channel where the water seal is formed, the water storage tank is provided with a storage part provided in a part thereof for storing flushing water from before the start of toilet flushing until after toilet flushing is performed and then returning to the state before the start of toilet flushing again, and a connection channel provided on the upstream side of the overflow channel for connecting the storage part and the overflow channel, and an outlet provided at the upstream end of the connection channel connected to the storage part is provided at a position lower than the water surface of the storage part, and the overflow channel located on the downstream side of the connection channel includes a part higher than the water stop level in the water storage tank before the start of toilet flushing. A flushing toilet characterized by this.
2. The water storage tank further includes a water storage tank body in which the storage part is provided, and the storage part is provided in the water storage tank body and is partitioned into a storage part inner region where flushing water is always stored regardless of the toilet flushing state and a storage part outer region outside thereof by a partition wall, and a side wall that forms a part of the storage part inner region and includes an outlet for flowing the flushing water in the storage part inner region into the connection channel, and the storage part outer region is connected to the flushing water supply channel, and the upper end of the partition wall is located below the water stop level in the water storage tank body before the start of toilet flushing and above the upper end of the outlet. The flushing toilet according to Claim 1.
3. The flush toilet with water washing according to claim 1, wherein the overflow channel is provided with a check valve configured to prevent backflow of washing water from the overflow channel into the connection channel, intrusion of odors, or entry of foreign matters such as insects.
4. Furthermore, it has a drain socket that forms a drain channel on the downstream side of the descending pipe of the drain trap section. This drain socket is connected to a drain unit via the overflow channel. This drain unit is connected to the water storage tank via the connection channel and is provided with the check valve inside. The flush toilet with water washing according to claim 3.
5. The drain unit is arranged above the center position of the cross-section of the drain channel where the drain socket extends tubularly in the front-rear direction, and is provided with a connection part that connects the overflow channel and the connection channel. This connection part is arranged above the water stop level in the water storage tank. The flush toilet with water washing according to claim 4.
6. The check valve is provided in the connection part and has a float structure that moves up and down according to the water level in the drain unit. This float structure is provided with a valve body arranged in the drain unit so as to open and close an overflow port that is the downstream end of the connection channel. This valve body rises due to the buoyancy of the washing water that has flowed into the drain unit from the overflow port through the connection channel after flowing out from the storage section, and is provided so as to open the overflow port and communicate the connection channel and the overflow channel. The flush toilet with water washing according to claim 5.
7. The drain socket is provided with a fixing part that fixes it to the toilet body without rotating in the circumferential direction around the center of the cross-section of the drain channel. The flush toilet with water washing according to claim 6.
8. The flush toilet with water washing is a wall-mounted flush toilet with water washing in which the toilet body is fixed to a wall or a cabinet located behind it. The flush toilet with water washing according to any one of claims 1 to 7.
Citation Information
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