Water-washable toilet

Abstract

The present invention aims to provide a siphon-jet type flush toilet in which the jet water channel is positioned below the top of the drain trap pipe, which can produce a sufficient jet of water to discharge waste and improve waste discharge performance. [Solution] The present invention comprises a water storage tank 4, a bowl section 6, a rim outlet 20, a drain trap pipe 8, a jet outlet 14, a jet water channel 16, and a drainage device 26. When the drainage device 26 is driven, the cleaning water in the water storage tank 4 flows into the jet water channel 16, causing a first flow rate Q1,q1 to be discharged from the jet outlet 14. After the discharge of this first flow rate Q1,q1 is completed, the cleaning water remaining in the jet water channel 16 flows towards the jet outlet 14, causing a second flow rate Q2,q2 to be discharged from the jet outlet 14.

Description

Technical Field

[0001] The present invention relates to a flushing toilet, and particularly to a siphon jet flushing toilet in which a jet water guide passage is disposed below the top of a drain trap pipe.

Background Art

[0002] Conventionally, a siphon jet flushing toilet that discharges washing water from a jet water outlet and generates a siphon action in a drain trap pipe to discharge dirt is known. There is a low siphon type toilet that includes a water storage tank for storing washing water, and the lower part of this water storage tank is disposed at a position lower than the upper surface of the rim part (for example, Patent Documents 1 and 2). The low siphon type toilet has an advantage that the height of the water storage tank is low and the overall appearance design of the toilet is excellent.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in a low siphon type siphon jet flushing toilet, a part of the water storage tank is disposed at a position lower than the upper surface of the rim part, and the jet water guide passage is disposed at a position lower than the top of the drain trap. Therefore, sufficient head pressure cannot be applied to the washing water flowing through the jet water guide passage, so sufficient jet water discharge for discharging dirt cannot be performed, and as a result, there is a problem that the dirt discharge performance deteriorates.

[0005] Therefore, the present invention has been made to solve the above-mentioned problems, and aims to provide a siphon jet type flush toilet in which the jet water channel is located below the top of the drain trap pipe, which can produce a sufficient jet of water to discharge waste and improve waste discharge performance. [Means for solving the problem]

[0006] To achieve the above objective, the present invention provides a siphon jet type flush toilet in which the jet water channel is located below the top of the drain trap pipe, comprising: a water storage tank for storing flushing water; a bowl portion having a bowl-shaped waste receiving surface and a rim portion formed on the upper edge; a rim outlet provided on the rim portion for discharging flushing water toward the bowl portion; a drain trap pipe comprising an upward-extending upward-extending upward-extending upward-extending upward-extending upward-extending upward-extending upward-extending upward-extending downward The device comprises a jet nozzle that discharges cleaning water toward the inlet, a jet conduit that connects the jet nozzle to a water storage tank and supplies cleaning water from the water storage tank to the jet nozzle, and a drainage device that supplies or stops the cleaning water stored in the water storage tank to the jet conduit. The drainage device is driven to cause cleaning water from the water storage tank to flow into the jet conduit, resulting in a first flow rate being discharged from the jet nozzle. After the discharge of this first flow rate is completed, the cleaning water remaining in the jet conduit flows toward the jet nozzle, resulting in a second flow rate being discharged from the jet nozzle. In the present invention configured as described above, the drainage device is activated, causing the cleaning water in the water storage tank to flow into the jet conduit, thereby discharging a first flow rate from the jet outlet. After the discharge of this first flow rate is completed, the cleaning water remaining in the jet conduit flows towards the jet outlet, discharging a second flow rate from the jet outlet. This allows the first flow rate to generate a siphon effect, and the second flow rate to continue the siphon effect. As a result, even in a siphon-jet type flush toilet where the jet conduit is located below the top of the drain trap pipe, a sufficient siphon effect for discharging waste can be generated and continued, thereby improving the waste discharge performance.

[0007] Furthermore, in the present invention, preferably, the maximum instantaneous flow rate of the second flow rate is set to be smaller than the maximum instantaneous flow rate of the first flow rate. In the present invention configured in this way, the maximum instantaneous flow rate of the second flow rate is set to be smaller than the maximum instantaneous flow rate of the first flow rate, so that the siphon action can be continued with the second flow rate which has a smaller maximum instantaneous flow rate. This makes it possible to achieve both improved waste discharge performance and water conservation.

[0008] In the present invention, preferably, the instantaneous flow rate of the second flow rate is set to increase more gradually than the instantaneous flow rate of the first flow rate until it reaches a maximum instantaneous flow rate. In the present invention configured as described above, the instantaneous flow rate of the second flow rate is set to increase gradually compared to the instantaneous flow rate of the first flow rate until it reaches the maximum instantaneous flow rate. Therefore, compared to the case where the instantaneous flow rate is increased rapidly, it is possible to suppress turbulence in the cleaning water discharged from the jet outlet. As a result, the cleaning water flows smoothly into the drain trap pipe and the siphon action can be continued.

[0009] Furthermore, in the present invention, preferably, the amount of water used for a large or small wash is switched by adjusting the jet discharge time at the first flow rate. In the present invention configured in this way, the amount of water used for a large or small wash can be switched by adjusting the jet discharge time at the first flow rate, thus enabling precise switching of the amount of water used for a wash.

[0010] In the present invention, preferably, after the drainage device has stopped, a second flow rate is discharged from the jet outlet. In the present invention configured in this way, after the drainage device stops, a second flow rate is discharged from the jet outlet, so the second flow rate can be discharged from the jet outlet using the cleaning water that remains in the jet conduit.

[0011] Furthermore, in the present invention, preferably, the jet water channel has an upstream channel extending forward from the water storage tank, a bent channel bending from the upstream channel, and a downstream channel extending backward from the bent channel and connected to the jet outlet, wherein the upstream channel is arranged substantially parallel to the drain trap pipe, and the bottom surface on the downstream side of the upstream channel is located below the upper end of the inlet of the drain trap pipe. In the present invention configured as described above, the upstream channel is arranged almost parallel to the drain trap pipe, and the bottom surface on the downstream side of the upstream channel is located below the upper end of the inlet of the drain trap pipe. Therefore, even when the water seal level drops and the siphon action is about to end, the washing water continues to accumulate on the downstream side of the upstream channel, thus allowing the siphon action to continue.

[0012] In the present invention, preferably, in the region forward of the top of the drain trap pipe, the bottom surface of the upstream channel is located below the upper end of the inlet of the drain trap pipe. In the present invention configured as described above, in the region forward of the top of the drain trap pipe, the bottom surface of the upstream channel is located below the upper end of the inlet of the drain trap pipe. Therefore, even when the water seal level drops and the siphon action is about to end, the washing water continues to remain in the upstream channel, thus allowing the siphon action to continue.

[0013] Furthermore, in the present invention, preferably, the center of the jet outlet is located at the lowest point on the central axis of the jet water conduit. In the present invention configured in this way, the center of the jet outlet is located at the lowest point of the central axis of the jet water conduit, so that cleaning water can be discharged from the jet outlet for a long period of time.

[0014] In the present invention, preferably, the water storage tank is provided with an overflow pipe for draining the water that overflows from the water storage tank, and this overflow pipe is provided at the same position as the drainage device or behind the drainage device. In the present invention configured as described above, the water storage tank is provided with an overflow pipe for draining the water that overflows from the water storage tank. Since this overflow pipe is located at the same position as the drainage device or behind the drainage device, air can be replaced through the overflow pipe on the rear side of the jet water conduit, preventing the flow toward the jet outlet from being obstructed by air replacement.

[0015] Furthermore, in the present invention, preferably, the jet conduit has a volume of 1 / 3 or more of the storage tank. In the present invention configured in this way, the jet water channel has a volume of at least one-third of the storage tank, so a large amount of cleaning water can be retained within the jet water channel. As a result, even if the storage tank is made smaller, sufficient jet water can be discharged to remove waste.

[0016] In the present invention, preferably, cleaning water is discharged from the rim outlet after the drainage device has been stopped. In the present invention configured in this way, since cleaning water is discharged from the rim outlet after the drainage device is stopped, even if the drainage device is stopped, the cleaning water from the rim outlet is added to the cleaning water discharged from the jet outlet, thus allowing the siphon effect to be continued for a longer period. [Effects of the Invention]

[0017] According to the flushing toilet of the present invention, it is a siphon jet type flushing toilet in which the jet water guide passage is arranged below the top of the drainage trap pipe, and it is possible to perform jet water discharge sufficient to discharge dirt, and it is possible to provide a flushing toilet capable of improving the dirt discharge performance.

Brief Description of the Drawings

[0018] [Figure 1] It is a plan view showing a flushing toilet according to an embodiment of the present invention. [Figure 2] It is a side sectional view seen along the line II-II of FIG. 1. [Figure 3] It is a perspective view showing the entire jet water guide passage according to an embodiment of the present invention. [Figure 4] It is a partial enlarged view of the jet water discharge port portion of the flushing toilet according to an embodiment of the present invention shown in FIG. 2. [Figure 5] [[ID=2O]]It is a plan sectional view of the downstream portion of the jet water guide passage of the flushing toilet according to an embodiment of the present invention shown in FIG. 1. [Figure 6A] It is a view showing the flow path cross section A of the jet water guide passage of the flushing toilet according to an embodiment of the present invention shown in FIG. 5. [Figure 6B] It is a view showing the flow path cross section B of the jet water guide passage of the flushing toilet according to an embodiment of the present invention shown in FIG. 5. [Figure 6C] It is a view showing the flow path cross section C of the jet water guide passage of the flushing toilet according to an embodiment of the present invention shown in FIG. 5. [Figure 6D] It is a view showing the flow path cross section D of the jet water guide passage of the flushing toilet according to an embodiment of the present invention shown in FIG. 5. [Figure 6E] It is a view showing the flow path cross section E of the jet water guide passage of the flushing toilet according to an embodiment of the present invention shown in FIG. 5. [Figure 6F] It is a view showing the flow path cross section F of the jet water guide passage of the flushing toilet according to an embodiment of the present invention shown in FIG. 5. [Figure 6G] It is a view showing the flow path cross section G of the jet water guide passage of the flushing toilet according to an embodiment of the present invention shown in FIG. 5. [Figure 7]This is a diagram illustrating the flushing operation of a flush toilet according to an embodiment of the present invention. [Figure 8A] This diagram shows the instantaneous flow rate of flushing water discharged from the jet nozzle and the instantaneous flow rate of flushing water flowing into the inlet of the drain trap pipe during a full flush of a flush toilet according to an embodiment of the present invention. [Figure 8B] This diagram shows the instantaneous flow rate of flushing water discharged from the jet nozzle and the instantaneous flow rate of flushing water flowing into the inlet of the drain trap pipe during a small flush of a flush toilet according to an embodiment of the present invention. [Modes for carrying out the invention]

[0019] The following describes a flush toilet 1 according to the first embodiment of the present invention. First, the basic structure of the flush toilet 1 according to the first embodiment will be explained with reference to Figures 1 and 2. Figure 1 is a plan view showing a flush toilet according to a first embodiment of the present invention, and Figure 2 is a side cross-sectional view taken along the line II-II in Figure 1.

[0020] As shown in Figures 1 and 2, the siphon jet type flush toilet 1 according to the first embodiment comprises a ceramic toilet bowl body 2, a resin toilet seat and toilet lid (not shown) positioned on the upper surface of the toilet bowl body 2, and a water storage tank 4 positioned at the rear upper part of the toilet bowl body 2 and covered by a resin cover (not shown).

[0021] The toilet bowl body 2 includes a bowl section 6 for receiving waste, a drain trap pipe 8 provided at the bottom of the bowl section 6 for discharging waste by siphon action, a rim spout 10 for discharging water from the rim, a rim water channel 12 for supplying flushing water to the rim spout 10, a jet spout 14 for discharging water in a jet stream, and a jet water channel 16 for supplying flushing water to the jet spout 14.

[0022] The bowl portion 6 comprises a bowl-shaped waste receiving surface 18, a rim portion 20 formed along the upper edge of the bowl portion 6, and a shelf portion 21 formed between the waste receiving surface 18 and the rim portion 20. The bowl portion 6 also includes a pot portion 22 formed in the area below the waste receiving surface 18 and connected to the drain trap pipe 8. A water seal surface W is formed inside this pot portion 22.

[0023] The drain trap pipe 8 comprises an inlet 8a, an upward pipe 8b extending upward from the inlet 8a, a downward pipe 8c extending downward from the upward pipe 8b, and a top 8d located between the downward pipe 8c and the upward pipe 8b, which defines the water seal level. Here, the lower end of the descending pipe 8c of the drain trap pipe 8 is connected to a drain pipe (not shown) via a drain socket (not shown).

[0024] The rim spout 10 is formed on the left rear side of the rim portion 20 when the toilet bowl body 2 is viewed from the front. The rim spout 10 discharges flushing water forward, and this flushing water flows down to the waste receiving surface 18 while swirling on the inner circumferential surface of the rim portion 20 and the shelf surface of the shelf portion 21.

[0025] The rim water channel 12 is formed in a tapered shape, with the cross-sectional area of ​​the channel gradually decreasing towards the rim outlet 10. A water supply hose 13, which is directly connected to the water supply, is connected to the upstream side of the rim water channel 12. Cleaning water is supplied to the rim water channel 12 from the water supply, and the cleaning water is discharged from the rim outlet 10 due to the water supply pressure from the water supply.

[0026] The jet outlet 14 is formed at the bottom of the bowl section 6. The jet outlet 14 is positioned opposite the inlet 8a of the drain trap pipe 8 and is directed toward the inlet 8a of the drain trap pipe 8. The jet outlet 14 discharges cleaning water toward the inlet 8a of the drain trap pipe 8, and this cleaning water flows into the drain trap pipe 8 to activate the siphon effect.

[0027] The jet water conduit 16 comprises an upstream channel 16a extending forward from the water storage tank 4, a bent channel 16b branching off from the upstream channel 16a, and a downstream channel 16c extending backward from the bent channel 16b and connecting to the jet discharge port 14. Cleaning water is supplied to the jet water conduit 16 from the water storage tank 4, and the cleaning water is discharged from the jet discharge port 14 due to the head pressure of this cleaning water.

[0028] The water storage tank 4 is a gravity-fed tank that stores the flushing water used for jet discharge and supplies it to the jet outlet 14. The water storage tank 4 is a small resin tank with a volume of approximately 3 liters. Approximately 2 liters of flushing water are discharged from the water storage tank 4 during one flush. The lower part of the water storage tank 4 is positioned below the upper surface of the rim portion 20 of the toilet bowl body 2, and above the top 8d of the drain trap pipe 8. As a result, the flush toilet 1 is a low-profile type toilet. The water source for supplying cleaning water to the jet outlet 14 is not limited to the gravity-fed water storage tank shown in this embodiment; a water storage tank equipped with a pump such as a pressure pump, jet pump, or accumulator pump may also be used.

[0029] Inside the water storage tank 4, there is a water supply device 24 that supplies cleaning water to the water storage tank 4, a drainage device 26 that supplies or stops the cleaning water stored in the water storage tank 4 to the jet water conduit 16, and a float switch 28 that detects when the water level of the cleaning water in the water storage tank 4 reaches the shut-off level (full water level). Outside the water storage tank 4, there is a controller (not shown) that controls the operation of the water supply device 24 and the drainage device 26 to be driven or stopped based on the user's operation signals, and an operation unit (not shown) that transmits operation signals in response to the user's operation.

[0030] The water supply device 24 includes a constant flow valve (not shown) connected to the water supply, a rim-side solenoid valve 23 that supplies or stops the flow of cleaning water to the rim outlet 10, and a tank-side solenoid valve 27 that supplies or stops the flow of cleaning water to the tank inlet 25 located inside the water storage tank 4. The rim-side solenoid valve 23 and the tank-side solenoid valve 27 are driven by a controller command based on user operation signals or water level detection signals from the float switch 28.

[0031] The drainage device 26 includes an overflow pipe 30 for draining overflow water from the water storage tank 4 into the toilet bowl body 2, a drain valve 32 fixed to the lower end of the overflow pipe 30, and a toilet flushing unit 36 ​​that opens and closes the drain valve 32 by moving the overflow pipe 30 up and down using an electric drive. In addition, a guide member 34 is attached around the drain port 4a of the water storage tank 4 to guide the up and down movement of the drain valve 32. The toilet flushing unit 36 ​​is driven by a controller command based on the user's operation signal. The drainage device is not limited to the drain valve shown in this embodiment; a pressure pump, jet pump, accumulator pump, etc., may be used instead of the drain valve.

[0032] The controller is electrically connected to the control unit, float switch 28, rim-side solenoid valve 23, tank-side solenoid valve 27, and toilet flushing unit 36, and is capable of sending and receiving various signals. The controller receives a flush start signal for a full or partial flush from the control unit and drives or stops the rim-side solenoid valve 23, tank-side solenoid valve 27, and toilet flushing unit 36 ​​based on a pre-stored flushing sequence. The amount of water used for flushing is approximately 4.8 liters for a full flush and approximately 3.8 liters for a partial flush.

[0033] Next, the jet water conduit 16 of the flush toilet according to this embodiment will be described in detail with reference to Figures 1 to 4. Figure 3 is a perspective view showing the entire jet water conduit according to this embodiment, and Figure 4 is a magnified view of the jet outlet portion of the flush toilet according to this embodiment shown in Figure 2.

[0034] First, as shown in Figure 1, the jet water channel 16 is formed in a U-shape overall and connects the drain port 4a of the water storage tank 4, which is located on the right side when viewing the toilet bowl body 2 from the front, to the jet outlet 14, which is located in the center in the left-right direction. The upstream channel 16a of the jet water channel 16 extends forward from the drain port 4a of the water storage tank 4, almost parallel to the drain trap pipe 8. The bent channel 16b of the jet water channel 16 bends (turns U-turn) towards the rear from the downstream end of the upstream channel 16a. Furthermore, the downstream channel 16c of the jet water channel 16 extends backward from the downstream end of the bent channel 16b towards the inlet 8a of the drain trap pipe 8.

[0035] Next, as shown in Figure 2, the jet water channel 16 is positioned below the top 8d of the drain trap pipe 8, i.e., below the water level W, except for a portion of area A of the upstream channel 16a located directly below the water storage tank 4 (the area near the drain outlet 4a of the water storage tank 4). Furthermore, as shown in Figure 3, the jet water channel 16 has a larger vertical and horizontal cross-section compared to conventional products, thereby increasing the overall volume of the jet water channel. Specifically, the jet water channel 16 has a volume (approximately 1 liter) that is more than 1 / 3 of the volume of the water storage tank 4 (approximately 3 liters). In addition, the jet water channel 16 has a volume (approximately 1 liter) that is more than half of the amount of cleaning water (approximately 2 liters) discharged from the water storage tank 4 in one cleaning cycle. As a result, more cleaning water remains in the jet water channel 16 compared to conventional products, and the head pressure of the retained cleaning water enables jet discharge. Furthermore, the present invention is not limited to toilets in which all of the jet water channels 16 are located below the top 8a of the drain trap pipe 8, but also includes toilets in which a portion of the jet water channels 16 is located above the top 8a, as in this embodiment.

[0036] Furthermore, as shown in Figure 4, the bottom surface 16d on the downstream side of the upstream channel 16a is located below the upper end 8e of the inlet 8a of the drain trap pipe 8. Moreover, this bottom surface 16d is located in front of the top 8d of the drain trap pipe 8, below the upper end 8e of the inlet 8a of the drain trap pipe 8 (see Figure 2). As a result, even when the water seal level drops and the siphon action is about to end, the washing water continues to accumulate on the downstream side of the upstream channel 16a, thus allowing the siphon action to continue.

[0037] Next, the center O1 of the jet outlet 14 is positioned at approximately the same height as the center O2 of the inlet 8a of the drain trap pipe 8. This makes it easier for the cleaning water discharged from the jet outlet 14 to flow into the inlet 8a of the drain trap pipe 8. Furthermore, the center O1 of the jet outlet 14 is located at the lowest point of the central axis X of the jet water conduit 16 (see Figure 2). As a result, because the center O1 of the jet outlet 14 is located at the lowest point, cleaning water can be discharged from the jet outlet 14 for a long period of time, thereby delaying the entry of air into the jet water conduit 16 from the jet outlet 14.

[0038] Furthermore, the upper end 14a of the jet outlet 14 is positioned below the upper end 8e of the inlet 8a of the drain trap pipe 8. This allows cleaning water to be discharged from the jet outlet 14 for a long period of time, thus maintaining the siphon effect. As shown in Figure 2, more than half of the jet conduit 16 is located above the upper end 8e of the inlet 8a of the drain trap pipe 8. This allows almost all of the cleaning water in the jet conduit to be discharged before the siphon effect ends. In addition, the upper surfaces 16g, 16h, 16i and the bottom surface 16d of the jet conduit 16 are gradually sloped downward from the upstream side to the downstream side. This makes it easier for the cleaning water to flow towards the jet outlet 14.

[0039] Next, the downstream portion of the jet water channel 16 of the flush toilet according to this embodiment will be described in detail with reference to Figures 1, 4 to 6G. Figure 5 is a plan cross-sectional view of the downstream portion of the jet water channel of a flush toilet according to the embodiment of the present invention shown in Figure 1, and Figures 6A to 6G show cross-sectional views A to G of the flow path of the jet water channel of a flush toilet according to the embodiment of the present invention shown in Figure 5.

[0040] First, as shown in Figure 5, the downstream channel 16c and the bent channel 16b of the jet water conduit 16 have curved sections 40 formed in a top view, which are eccentric to the opposite side of the upstream channel 16a from the central axis O1 of the jet outlet 14. The eccentricity distance D between the central axis O1 of the jet outlet 14 and the central axis O3 of the downstream end of the bent channel 16b is set to approximately 9 mm. This curved section 40 adjusts the flow velocity distribution of the cleaning water discharged from the jet outlet 14, so that the flow velocity distribution in the cross-section of the jet outlet 14 becomes almost uniform.

[0041] Next, as shown in Figure 1, the curved section 40 is positioned in the inner region (within the water-sealing region) of the water-sealing surface W when viewed from above, and the entire bent channel 16b is also positioned in the inner region of the water-sealing surface W. As a result, the curved section 40 and the bent channel 16b of the jet water conduit 16 are compactly formed. Furthermore, since the curved section 40 and the bent channel 16b are positioned in the inner region of the water-sealing surface W, the curved section 40 and the bent channel 16b can always be kept full of water, thereby suppressing the accumulation of air within the curved section 40 and the bent channel 16b.

[0042] Furthermore, as shown in Figure 5, a flow straightening section 42 is formed in the downstream flow path 16c on the downstream side of the curved section 40, extending backward toward the jet outlet 14. The flow straightening section 42 extends almost in a straight line for a length of approximately 25 mm toward the jet outlet 14. This allows the cleaning water to be straightened after flowing through the curved section 40.

[0043] Next, the inner surface of the bent channel 16b is formed such that the radius of curvature on the upstream side is r1 and the radius of curvature on the downstream side is r2, with the downstream radius of curvature r2 being smaller than the upstream radius of curvature r1. Furthermore, the outer surface of the bent channel 16b is formed such that the radius of curvature on the upstream side is R1 and the radius of curvature on the downstream side is R2, with the downstream radius of curvature R2 being larger than the upstream radius of curvature R1.

[0044] Here, the cleaning water F1 flowing along the inner surface of the bent channel 16b is affected by centrifugal force and separates from the inner surface, and stagnation S is always generated near the inner surface on the downstream side of the bent channel 16b (see Figure 5). For this reason, even if the radius of curvature of the inner surface on the downstream side of the bent channel 16b is reduced, the effect of energy loss is small. Therefore, since the inner surface on the downstream side of the bent channel 16b, where stagnation S occurs, has a relatively small radius of curvature r2, it is possible to make the bent channel 16b compact while suppressing energy loss in the cleaning water flowing through the bent channel 16b.

[0045] Furthermore, the washing water F2 flowing along the outer surface of the bent channel 16b is affected by centrifugal force, resulting in a relatively larger flow rate compared to the washing water F1. Since the outer surface of the downstream side of the bent channel 16b, through which a relatively large amount of washing water F2 flows, has a relatively large radius of curvature R2, it is possible to maintain the flow velocity while simultaneously suppressing flow separation on the outer surface of the bent channel 16b.

[0046] Furthermore, the jet conduit 16 is formed by a pour molding (double molding) method, which creates a solid molded body between the upstream channel 16a and the flow straightening section 42 of the downstream channel 16c. This makes the space between the upstream channel 16a and the flow straightening section 42 of the downstream channel 16c thinner, allowing the jet conduit 16 to be made more compact.

[0047] As shown in Figures 2 and 6A to 6G, the bottom surface 16d of the upstream channel 16a of the jet conduit 16 is formed to slope downward from the upstream side to the downstream side, while the bottom surface 16e of the bent channel 16b and the bottom surface 16f of the downstream channel 16c are formed to be at approximately the same height and are almost horizontal.

[0048] As shown in Figure 2, the upper surface 16g of the upstream channel 16a, the upper surface 16h of the bent channel 16b, and the upper surface 16i of the downstream channel 16c of the jet water conduit 16 are formed to be inclined downward from the upstream side to the downstream side.

[0049] As shown in Figures 6B to 6D, the height of the upper surface 16h of the bent channel 16b is higher on the outer surface side than on the inner surface side. This allows the cross-sectional area of ​​the bent channel 16b to be larger on the outer surface side than on the inner surface side, thereby suppressing the separation of the cleaning water F2 flowing on the outer surface of the bent channel 16b from the outer surface of the bent channel 16b. Furthermore, as shown in Figures 6F and 6G, the height of the flow straightening section 42 of the downstream channel 16c is formed so that the inner surface side and the outer surface side are at approximately the same height. This allows for better straightening of the cleaning water flow.

[0050] As shown in Figures 6B to 6G, the cross-sections of the bent channel 16b and the downstream channel 16c gradually increase in width and decrease in height from the upstream side to the downstream side. This allows a flattened, high-flow stream to be discharged from the jet outlet 14.

[0051] Next, the flushing operation of the flush toilet 1 according to the first embodiment of the present invention will be explained with reference to Figure 7. Figure 7 is a diagram illustrating the flushing operation of a flush toilet according to the first embodiment of the present invention.

[0052] Figure 7(a) shows the standby state, where cleaning water has accumulated in the bowl section 6 up to the water seal level, and cleaning water has also accumulated in the jet conduit 16 up to the same height as the water seal surface W. At this time, air is stagnating in a portion of area A of the upstream channel 16a located directly below the water storage tank 4.

[0053] Next, as shown in Figure 7(b), the water supply device is activated (the rim-side solenoid valve opens), and rim water discharge begins, causing the water level in the bowl section 6 to gradually rise. Consequently, the water level in the jet water channel 16 also gradually rises, and the air that had been stagnating in a portion of area A of the upstream flow path 16a is discharged from the overflow pipe 30, causing the jet water channel 16 to become full of water.

[0054] Subsequently, as shown in Figure 7(c), while the rim discharge continues, the drainage device 26 is activated (the drain valve 32 opens) and jet discharge begins. At this time, the wash water remaining in the jet water channel 16 is subjected to the head pressure of the wash water stored in the storage tank 4, and a first flow rate is discharged from the jet outlet 14. The first flow rate is a large flow rate, and the jet discharge of the first flow rate fills the drain trap pipe 8, activating the siphon action. The jet discharge of the first flow rate continues for a predetermined time, and the sewage is discharged by the powerful siphon action.

[0055] Next, as shown in Figure 7(d), the drainage device 26 stops (the drain valve 32 closes) while the rim discharge continues. Even though the drainage device 26 stops, because the overall volume of the jet conduit 16 is large, a large amount of cleaning water remains in the jet conduit 16, and a second flow rate is discharged from the jet outlet 14 as the water flows through the jet conduit 16 under the head pressure of the stored cleaning water. The second flow rate is smaller than the first flow rate, but it is sufficient to continue the siphon effect. The jet discharge of the second flow rate continues for a predetermined time, and the siphon effect continues.

[0056] Subsequently, as shown in Figure 7(e), the siphon action causes the seal water to be discharged along with the waste, lowering the water level of the cleaning water in the bowl section 6. Air then enters from the upper end of the inlet 8a of the drain trap pipe 8, ending the siphon action. Here, the jet water channel 16 is formed so that the cleaning water continues to stagnate, delaying the entry of air and thus delaying the end of the siphon action. Rim discharge continues, and cleaning ends when the cleaning water in the bowl section 6 reaches the seal water level. At this time, the cleaning water in the jet water channel 16 also reaches the same height as the seal water surface.

[0057] Next, as shown in Figure 7(f), the water supply device is activated (the tank-side solenoid valve opens) and water supply to the tank begins. When the water level of the cleaning water in the storage tank 4 rises and the float switch detects that the water level has reached the shut-off level (full water level), the water supply device stops (the tank-side solenoid valve closes), and then returns to the original standby state as shown in Figure 7(a).

[0058] Next, Figures 8A and 8B will be used to describe in detail the jet water discharge pattern of the flush toilet according to the embodiment of the present invention. Figure 8A is a diagram showing the instantaneous flow rate of flushing water discharged from the jet nozzle and the instantaneous flow rate of flushing water flowing into the inlet of the drain trap pipe during a full flush of a flush toilet according to an embodiment of the present invention, and Figure 8B is a diagram showing the instantaneous flow rate of flushing water discharged from the jet nozzle and the instantaneous flow rate of flushing water flowing into the inlet of the drain trap pipe during a small flush of a flush toilet according to an embodiment of the present invention. The dashed lines in Figures 8A and 8B indicate the instantaneous flow rate of flushing water discharged from the jet nozzle 14, and the solid lines in Figures 8A and 8B indicate the instantaneous flow rate of flushing water flowing into the inlet 8a of the drain trap pipe 8.

[0059] In this embodiment, the amount of cleaning water discharged from the jet nozzle 14 is approximately 2 liters for a full wash and approximately 1.5 liters for a light wash.

[0060] During a major flush, as shown in Figure 8A, when the drainage device 26 is activated, jet discharge begins, and a first flow rate Q1 is discharged from the jet outlet 14. At this time, the instantaneous flow rate of the cleaning water discharged from the jet outlet 14 increases rapidly immediately after the start (increase rate A), and immediately reaches the maximum instantaneous flow rate Q1max. This rapidly activates the siphon effect (time T1). After this, the instantaneous flow rate decreases slightly from the maximum instantaneous flow rate Q1max and becomes almost constant. In addition, the instantaneous flow rate of the cleaning water flowing into the inlet 8a of the drain trap pipe 8 increases rapidly because, in addition to the cleaning water discharged from the jet outlet 14 and the rim outlet 10, the seal water is drawn into the drain trap pipe 8 by the siphon effect. This activates and maintains a powerful siphon effect.

[0061] Next, as shown in Figure 8A, after the drainage device 26 stops (time T2) and the discharge of the first flow rate Q1 ends, the second flow rate Q2 is discharged from the jet outlet 14. At this time, the instantaneous flow rate of the cleaning water discharged from the jet outlet 14 increases more gradually than the increase rate A of the first flow rate Q1 (increase rate B), reaching the maximum instantaneous flow rate Q2max. This suppresses turbulence in the cleaning water discharged from the jet outlet 14. Furthermore, the maximum instantaneous flow rate Q2max of the second flow rate Q2 is set to be smaller than the maximum instantaneous flow rate Q1max of the first flow rate Q1. This allows the siphon action to be maintained with the second flow rate Q2, which is smaller than the first flow rate Q1, thus achieving both improved waste discharge performance and water conservation. In addition, the instantaneous flow rate of the cleaning water flowing into the inlet 8a of the drain trap pipe 8 is maintained at a high instantaneous flow rate because, in addition to the cleaning water discharged from the jet outlet 14 and the rim outlet 10, the seal water is drawn into the drain trap pipe 8 by the siphon action.

[0062] In a small flush, as shown in Figure 8B, when the drainage device 26 is activated, jet discharge begins, and a first flow rate q1 is discharged from the jet outlet 14. At this time, the instantaneous flow rate of the cleaning water discharged from the jet outlet 14 increases rapidly immediately after the start (increase rate a), and immediately reaches the maximum instantaneous flow rate q1max. This rapidly activates the siphon effect (time t1). After this, the instantaneous flow rate decreases slightly from the maximum instantaneous flow rate q1max, and then decreases rapidly when the drainage device 26 stops (time t2). In addition, the instantaneous flow rate of the cleaning water flowing into the inlet 8a of the drain trap pipe 8 increases rapidly because, in addition to the cleaning water discharged from the jet outlet 14 and the rim outlet 10, the seal water is drawn into the drain trap pipe 8 by the siphon effect. This activates and maintains a powerful siphon effect.

[0063] Next, as shown in Figure 8B, after the drainage device 26 stops (time t2) and the discharge of the first flow rate q1 ends, the second flow rate q2 is discharged from the jet outlet 14. At this time, the instantaneous flow rate of the cleaning water discharged from the jet outlet 14 increases more gradually than the increase rate a of the first flow rate q1 (increase rate b), reaching the maximum instantaneous flow rate q2max. This suppresses turbulence in the cleaning water discharged from the jet outlet 14. Furthermore, the maximum instantaneous flow rate q2max of the second flow rate q2 is set to be smaller than the maximum instantaneous flow rate q1max of the first flow rate q1. This allows the siphon action to be maintained with the second flow rate q2, which is smaller than the first flow rate q1, thus achieving both improved waste discharge performance and water conservation. In addition, the instantaneous flow rate of the cleaning water flowing into the inlet 8a of the drain trap pipe 8 is maintained at a high instantaneous flow rate because, in addition to the cleaning water discharged from the jet outlet 14 and the rim outlet 10, the seal water is drawn into the drain trap pipe 8 by the siphon action.

[0064] Comparing the large and small flushes, as shown in Figures 8A and 8B, the amount of water used for the large or small flush is switched by adjusting the jet discharge time based on the first flow rate Q1 of the large flush and the first flow rate q1 of the small flush. This allows for precise switching of the amount of water used for the flush.

[0065] The effects and benefits of the above-described embodiment will be explained below. In the flush toilet 1 according to an embodiment of the present invention, the drainage device 26 is driven so that flushing water in the water storage tank 4 flows into the jet water channel 16, causing a first flow rate Q1,q1 to be discharged from the jet outlet 14. After the discharge of the first flow rate Q1,q1 is completed, the flushing water remaining in the jet water channel 16 flows towards the jet outlet 14, causing a second flow rate Q2,q2 to be discharged from the jet outlet 14. Thus, the first flow rate Q1,q1 generates a siphon effect, and the second flow rate Q2,q2 continues the siphon effect. As a result, even in a siphon jet type flush toilet 1 where the jet water channel 16 is located below the top 8d of the drain trap pipe 8, a sufficient siphon effect to discharge waste can be generated and continued, thereby improving the waste discharge performance.

[0066] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the maximum instantaneous flow rates Q2max, q2max of the second flow rates Q2, q2 are set to be smaller than the maximum instantaneous flow rates Q1max, q1max of the first flow rates Q1, q1. Therefore, the siphon action can be continued by the second flow rates Q2, q2, which have smaller maximum instantaneous flow rates. This makes it possible to achieve both improved waste discharge performance and water conservation.

[0067] In the flush toilet 1 according to an embodiment of the present invention, the instantaneous flow rates of the second flow rates Q2,q2 are set to increase gradually (increase rate b) compared to the instantaneous flow rates of the first flow rates Q1,q1, until they reach the maximum instantaneous flow rates Q2max,q2max. Therefore, compared to the case where the instantaneous flow rates are increased rapidly, it is possible to suppress turbulence in the flushing water discharged from the jet outlet 14. As a result, the flushing water flows smoothly into the drain trap pipe 8, and the siphon action can be continued.

[0068] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the amount of water used for a full flush or a partial flush is switched by adjusting the jet discharge time with the first flow rates Q1, q1, so that the amount of water used for flushing can be switched accurately.

[0069] In the flush toilet 1 according to an embodiment of the present invention, after the drainage device 26 stops, the second flow rates Q2,q2 are discharged from the jet outlet 14, so the flushing water retained in the jet conduit 16 can discharge the second flow rates Q2,q2 from the jet outlet 14.

[0070] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the upstream flow path 16a is arranged almost parallel to the drain trap pipe 8, and the bottom surface 16d on the downstream side of the upstream flow path 16a is located below the upper end 8e of the inlet 8a of the drain trap pipe 8. Therefore, even when the water seal level drops and the siphon action is about to end, flushing water continues to accumulate on the downstream side of the upstream flow path 16a, thus allowing the siphon action to continue.

[0071] In the flush toilet 1 according to an embodiment of the present invention, in the region forward of the top 8d of the drain trap pipe 8, the bottom surface 16d of the upstream channel 16a is located below the upper end 8e of the inlet 8a of the drain trap pipe 8. Therefore, even when the water seal level drops and the siphon action is about to end, flushing water continues to remain in the upstream channel 16a, thus allowing the siphon action to continue.

[0072] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the center O1 of the jet outlet 14 is located at the lowest point of the central axis X of the jet water channel 16, so that flushing water can be discharged from the jet outlet 14 for a long period of time.

[0073] In the flush toilet 1 according to an embodiment of the present invention, the water storage tank 4 is provided with an overflow pipe 30 for draining the water that overflows from the water storage tank 4. Since this overflow pipe 30 is located at the same position as the drainage device 26 or behind the drainage device 26, air can be replaced via the overflow pipe 30 on the rear side of the jet water conduit 16, preventing the flow toward the jet outlet 14 from being obstructed by air replacement.

[0074] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the jet water channel 16 has a volume of 1 / 3 or more of the water storage tank 4, so that a large amount of flushing water can be retained in the jet water channel 16. As a result, even if the water storage tank 4 is made smaller, sufficient jet water can be discharged to remove waste.

[0075] In the flush toilet 1 according to an embodiment of the present invention, flushing water is discharged from the rim outlet 10 after the drainage device 26 is stopped. Therefore, even if the drainage device 26 is stopped, the flushing water from the rim outlet 10 is added to the flushing water discharged from the jet outlet 14, thus allowing the siphon effect to be continued for a longer period.

[0076] The present invention is not limited to the embodiments described above, and various modifications and variations are possible within the scope of the technical idea described in the claims. [Explanation of symbols]

[0077] 1: Flush toilet 2: Toilet bowl 4: Water storage tank 6: Bowl section 8: Drain trap pipe 8a: Inlet of drain trap pipe 8b: Rising pipe for drain trap piping 8c: Downward pipe for drain traps 8d: Top of the drain trap pipe 8e: Upper end of the inlet of the drain trap pipe. 10: Rim spout 14: Jet nozzle 14a: Upper end of the jet nozzle 16: Jet water conduit 16a: Upstream channel of the jet conduit 16b: Bent channel of a jet conduit 16c: Downstream channel of the jet conduit 16d: Bottom surface of the upstream channel of the jet conduit 16e: Bottom surface of the bent channel of the jet conduit 16f: Bottom surface of the downstream channel of the jet conduit 16g: Upper surface of the upstream channel of the jet conduit. 16h: Upper surface of the bent channel of the jet water conduit 16i: Upper surface of the downstream channel of the jet conduit 18: Waste receiving surface 20: Rim section 26: Drainage device 30: Overflow pipe 32: Drain valve 40: Curved section 42: Rectifier D: Eccentricity distance F1: Cleaning water for the inner circumferential surface F2: Cleaning water for the outer surface O1: Center of the jet nozzle O2: Center of the inlet of the drain trap pipe. O3: Center of the downstream end of the bend in the channel. X: Central axis of the jet conduit Q1, q1: First flow rate Q1max, q1max: Maximum instantaneous flow rate of the first flow rate A,a: Increase rate of the first flow rate Q2, q2: Second flow rate Q2max, q2max: Maximum instantaneous flow rate of the second flow rate. B,b: Second rate of increase in flow rate R1: Radius of curvature on the upstream side of the outer surface R2: Radius of curvature on the downstream side of the outer surface r1: Radius of curvature on the upstream side of the inner surface r2: Radius of curvature on the downstream side of the inner surface W: Water sealing surface

Claims

1. A siphon jet type flush toilet in which the jet water channel is located below the top of the drain trap pipe, A water storage tank for storing cleaning water, A bowl-shaped waste receiving surface and a rim formed on the upper edge, A rim outlet is provided on the rim portion and discharges cleaning water toward the bowl portion, A drain trap pipe comprising a rising pipe extending upward from the bottom of the bowl section, a descending pipe extending downward from the rising pipe, and a top section located between the descending pipe and the rising pipe that defines the water seal level, A jet nozzle is provided at the bottom of the bowl section above and discharges cleaning water toward the inlet of the drain trap pipe, A jet water channel connects the above-mentioned jet outlet and the above-mentioned water storage tank, and supplies cleaning water from the above-mentioned water storage tank to the above-mentioned jet outlet, A drainage device that supplies or stops the flow of cleaning water stored in the above-mentioned water storage tank to the above-mentioned jet water channel, It has, A flush toilet characterized in that the above-mentioned drainage device is driven so that the flushing water in the water storage tank flows into the jet water channel, causing a first flow rate to be discharged from the jet outlet, and after the discharge of this first flow rate is finished, the flushing water remaining in the jet water channel flows toward the jet outlet, causing a second flow rate to be discharged from the jet outlet.

2. The flush toilet according to claim 1, wherein the maximum instantaneous flow rate of the second flow rate is set to be smaller than the maximum instantaneous flow rate of the first flow rate.

3. The flush toilet according to claim 1 or 2, wherein the instantaneous flow rate of the second flow rate is set to increase gradually compared to the instantaneous flow rate of the first flow rate to reach a maximum instantaneous flow rate.

4. The flush toilet according to claim 1, wherein the amount of water used for a full flush or a partial flush is switched by adjusting the jet discharge time according to the first flow rate described above.

5. The flush toilet according to claim 1, wherein the second flow rate is discharged from the jet outlet after the drainage device has stopped.

6. The jet conduit described above has an upstream channel extending forward from the water storage tank, a bent channel that curves from this upstream channel, and a downstream channel that extends backward from this bent channel and connects to the jet outlet. The flush toilet according to claim 1, wherein the upstream flow path is arranged substantially parallel to the drain trap pipe, and the bottom surface on the downstream side of the upstream flow path is located below the upper end of the inlet of the drain trap pipe.

7. The flush toilet according to claim 6, wherein in the region forward of the top of the drain trap pipe, the bottom surface of the upstream flow path is located below the upper end of the inlet of the drain trap pipe.

8. The flush toilet according to claim 6 or 7, wherein the center of the jet outlet is located at the lowest point on the central axis of the jet water channel.

9. The flush toilet according to claim 1, wherein the water storage tank is provided with an overflow pipe for draining water that overflows from the water storage tank, and this overflow pipe is provided at the same position as the drainage device or behind the drainage device.

10. The flush toilet according to claim 1, wherein the jet water channel has a volume of 1 / 3 or more of the water storage tank.

11. A flush toilet according to claim 1, wherein flushing water is discharged from the rim outlet after the drainage device is stopped.

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