Cleaning water tank device

Abstract

To provide a cleaning water tank device in which a water feeding pipe does not deform at a folding part which has large curvature and is liable to receive resistance of the cleaning water in the water feeding pipe and which can reduce the number of times when a flow direction of the cleaning water in the water feeding pipe changes sharply.SOLUTION: A water feeding pipe of a cleaning water tank device is constituted by a folding part having the largest curvature and a hose part other than the folding part, and hardness of the folding part is larger than hardness of the hose part.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a flush water tank apparatus, and more particularly to a flush toilet apparatus that uses a jet pump action to supply flush water to the toilet body for flushing. [Background technology]

[0002] 2. Description of the Related Art Conventionally, as described in Patent Document 1, for example, flush toilet apparatuses are known that use a jet pump unit to continuously supply a large flow rate of flush water to the toilet body.

[0003] This toilet discharges flushing water from a nozzle directly connected to a water pipe, drawing in the water from the tank into the throat and supplying a large flow of flushing water to the toilet.

[0004] The throat pipe is divided into an upflow pipe that guides the flush water coming in from the jet nozzle diagonally upwards, and a downflow pipe that guides the raised flush water to the drain, and has an upwardly convex L-shape. Because it is upflowing L-shaped with its tip facing downwards, even if the user starts the flushing action and the flush water in the tank decreases and the part connecting the upflow pipe and the downflow pipe emerges from the flush water in the tank, a large flow of flush water can be supplied to the toilet body until the throat pipe is completely exposed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP2002-58609A Summary of the Invention [Problem to be solved by the invention]

[0006] Because the throat pipe is an upward-convex L-shape, the wash water flowing into the uprising pipe must be discharged diagonally upward from the jet nozzle. Therefore, the water supply pipe that leads the wash water to the jet nozzle must have a turning point to change the flow of the wash water coming downward from the top of the tank to an upward direction.

[0007] In recent years, the thickness of tanks in the front-to-back or left-to-right directions has been designed to be small from the perspective of design and nursing care, so if the water supply pipe is to have a bend, the curvature of the water supply pipe inevitably becomes larger.

[0008] If the curvature is large, resistance from the cleaning water will be large, and parts will be easily deformed at points with large curvatures, and if the hardness is low, such as in the case of a hose, the hose will bend every time cleaning water passes through it. When bending occurs, the number of times the direction of the cleaning water in the water supply pipe changes suddenly increases, the water pressure in the water supply pipe decreases, and the water pressure of the cleaning water sprayed from the jet nozzle toward the throat pipe also weakens, so the amount of cleaning water that can be drawn in when the water enters the throat pipe decreases. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, the present invention provides a flush toilet device that flushes by supplying flushing water to a toilet body by means of a jet pump action, the flush toilet device comprising: a toilet body having a bowl portion for receiving waste and a water conduit for guiding flushing water to the bowl portion; a water storage tank for storing flushing water to be supplied to the toilet body; and a jet pump unit arranged with at least a portion of it submerged in the water storage tank and supplying the flushing water in the water storage tank to the toilet body, the jet pump unit comprising a throat pipe with a riser pipe extending diagonally upward from a suction port formed below it, a jet nozzle that sprays flushing water toward the suction port of the throat pipe to induce a jet pump action, a water supply valve that starts and stops the supply of flushing water from a water supply source to the jet nozzle, and a water supply pipe connecting the water supply valve and the jet nozzle, the water supply pipe being composed of a folded portion connected to the jet nozzle with the largest curvature, and a hose portion excluding the folded portion, the folded portion being less flexible than the hose portion. In the present invention configured in this way, the supply water pipe does not deform at the turning points with large curvatures that are more susceptible to resistance from flush water, and the number of times that the flush water in the supply water pipe suddenly changes direction can be reduced. This makes it possible to suppress a decrease in the water force in the supply water pipe, and in turn a decrease in the water force of the flush water sprayed from the jet nozzle toward the throat pipe, so it is possible to ensure the amount of flush water that can be drawn in when water enters the throat pipe.

[0010] In the present invention, the folded portion is preferably configured to have a constant curvature. In the present invention configured in this way, the constant curvature causes the water flowing through the water supply pipe to change direction regularly, maintaining the flow straightness within the flow path and reducing water pressure loss. Therefore, by discharging water from the jet nozzle into the throat pipe at a high flow rate, the instantaneous flow rate of flush water discharged from the drain can be increased by discharging water into the throat pipe while entraining more water, which in turn improves the cleaning performance of the bowl section and reduces the amount of residual dirt.

[0011] In the present invention, preferably, the large curvature portion is composed of an upper surface portion constituting the ceiling surface of the large curvature portion and a bottom surface portion constituting the bottom surface, and the upper surface portion and the bottom surface portion are welded. In the present invention configured in this way, even if the flow rate of the cleaning water flowing through the large curvature portion increases due to the effect of reducing the pressure loss of water, and a large force is applied to the large curvature portion, the upper surface portion and the bottom surface portion are welded with high adhesive strength, so that the upper surface portion and the bottom surface portion can be prevented from coming off. In addition, for example, if a hose is used for the folded portion, a portion of the flow path may be crushed when bent beyond a certain level, causing the flow path to differ. However, in this configuration formed by welding the upper surface portion and the bottom surface portion, although it cannot be bent when installed like a hose, crushing does not occur even if the curvature of the folded portion is increased, so that the flow path is prevented from differing depending on the location and is easy to handle. Effect of the Invention

[0012] According to the flush water tank device of the present invention, the supply water pipe does not deform at turning points with large curvatures that are susceptible to resistance from flush water, and the number of times that the flow direction of flush water in the supply water pipe changes suddenly can be reduced. This makes it possible to suppress a decrease in the water force in the supply water pipe, and in turn a decrease in the water force of the flush water sprayed from the jet nozzle towards the throat pipe, so it is possible to ensure the amount of flush water that can be drawn in when water enters the throat pipe. [Brief description of the drawings]

[0013] [Figure 1] 1 is a plan view showing a flush toilet equipped with a flush water tank apparatus according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] 1 is a block diagram showing the basic configuration of a flush water tank assembly according to a first embodiment of the present invention. [Figure 4] 1 is a schematic front cross-sectional view of a water storage tank main body and a small tank, illustrating the basic configuration of a flush water tank apparatus according to a first embodiment of the present invention. [Diagram 5]1 is a plan view showing the internal structure of the water storage tank body of a flush water tank apparatus according to a first embodiment of the present invention. FIG. [Figure 6] FIG. 2 is a top view of the outer tank body of a flush water tank apparatus according to a first embodiment of the present invention. [Figure 7] FIG. 1 is a perspective view from below of a flush water tank apparatus for a toilet body according to a first embodiment of the present invention. [Figure 8] FIG. 1 is an exploded perspective view of a toilet body and flush water tank apparatus according to a first embodiment of the present invention. [Figure 9] 4 is a perspective view showing the position of a folded-back portion in a second water supply pipe according to the first embodiment of the present invention. FIG. [Figure 10] 3 is an exploded perspective view of a folded-back portion of a second water supply pipe according to the first embodiment of the present invention; FIG. [Figure 11] 4 is a front cross-sectional view of a folded-back portion of a second water supply pipe according to the first embodiment of the present invention. FIG. [Figure 12] FIG. 2 is a cross-sectional view showing the relationship between a throat pipe, a branch pipe, and a jet nozzle according to the first embodiment of the present invention. [Figure 13] FIG. 2 is an assembly diagram showing the relationship between a throat pipe, a branch pipe, and a jet nozzle according to the first embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] A flush toilet equipped with a flush water tank apparatus according to a first embodiment of the present invention will be described below with reference to the accompanying drawings. First, the basic structure of a flush toilet equipped with a flush water tank apparatus according to a first embodiment of the present invention will be explained with reference to Figs. FIG. 1 is a plan view showing a flush toilet equipped with a flush water tank apparatus according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II in FIG.

[0015] First, as shown in Figures 1 and 2, a flush toilet 2 equipped with a flush water tank apparatus 1 according to a first embodiment of the present invention is equipped with a toilet body 4. Located on the upper surface at the rear side of this toilet body 4 is the flush water tank apparatus 1 of this embodiment, details of which will be described later. Next, as shown in Figures 1 and 2, the toilet body 4 has a bowl portion 6 provided on its front side, a rim portion 8 formed on the upper edge of the bowl portion 6, and a shelf portion 10 formed on the inner circumference of the rim portion 8. Additionally, an inlet 12a of a trap drainage channel 12 opens at the bottom of the bowl portion 6 of the toilet body 4, and this trap drainage channel 12 is equipped with a trap ascending pipe 12b extending upward and a trap descending pipe 12c extending downward. As can be seen from the shape of this trap drainage channel 12, the flush toilet 2 according to this embodiment is a wash-down toilet that discharges waste by a vertical drop. In this embodiment, a form applied to a wash-down toilet will be described, however, the present invention is not limited to this form and can also be applied to other types of flush toilets, such as a so-called siphon type toilet, which uses the siphon action to suck up waste in the bowl and discharge it to the outside all at once through the drain trap pipe.

[0016] Next, the toilet body 4 is equipped with a water conduit 16 into which flushing water discharged from the drain outlet 14 of the flushing water tank device 1 flows, a first rim spout 18 formed in the center of the left side when viewed from the front of the shelf portion 10, and a second rim spout 20 formed in the rear right side when viewed from the front. In addition, the water conduit 16 branches downstream into a first water conduit 16a and a second water conduit 16b, and the flushing water in the water conduit 16 reaches the first rim outlet 18 via the first water conduit 16a, while reaching the second rim outlet 20 via the second water conduit 16b. The flushing water is discharged from the first rim outlet 18 and the second rim outlet 20, respectively, to wash the bowl portion 6 and discharge waste matter from the trap drain 12.

[0017] Next, the flush water tank apparatus 1 of the present embodiment will be explained in detail with reference to Figs. First, Fig. 3 is a block diagram showing the basic configuration of a flush water tank apparatus according to a first embodiment of the present invention. Also, Fig. 4 is a schematic front cross-sectional view of the storage tank main body and small tank showing the basic configuration of a flush water tank apparatus according to the first embodiment of the present invention. Furthermore, Fig. 5 is a plan view showing the internal structure of the storage tank main body of the flush water tank apparatus according to the first embodiment of the present invention. In addition, in the flush water tank apparatus 1 shown in Figure 3, for convenience, the entire internal structure of the water storage tank main body 22 has been diagrammatically simplified, and therefore the structural arrangement of the flush water tank apparatus 1 shown in Figures 4 and 5 is different. Also, in the flush water tank apparatus 1 shown in FIG. 4, some of the structure has been simplified. Furthermore, with regard to the left-right direction of the flush water tank device 1 shown in Figures 1 to 8, the left side in the left-right direction when viewed from the front side (user's side) of the toilet body 4 of the flush toilet 2 is defined as the "left side," and the right side in the left-right direction when viewed from the front side of the toilet body 4 is defined as the "right side."

[0018] First, as shown in Figures 3 to 5, the flush water tank device 1 comprises a resin outer tank T, a water storage tank main body 22 which is an inner tank housed within this outer tank T, and a first water supply pipe 24 connected to a water supply source (not shown) such as a water line. In the water storage tank body 22 , a portion of the flush water supplied via a water supply pipe 24 is stored, and can be supplied to the water channel 16 of the toilet body 4 . Also, as shown in FIG. 4, the water storage tank body 22 is positioned at a relatively low position on the rear side of the toilet body 4, and the upper end height position of the water storage tank body 22 is low, so it is a so-called low silhouette type tank, and as shown in FIG. 5, it is formed in a flat shape that is long in the left-right direction when viewed in a plane.

[0019] 6, in order to prevent the humidity in the exterior tank T and the water storage tank body 22 from increasing, causing water leakage from the exterior tank T, and to prevent electronic components in the water storage tank body 22 from being exposed to high humidity, an air intake section 21 is formed in the lower part of the water storage tank body 22, on the left rear side of the first water supply pipe, to exchange the air in the water storage tank body 22 with the outside air and to prevent an increase in humidity inside the water storage tank body 22. In addition, a connecting section 23 is provided between the air intake section 21 and the discharge port 50b. As a result, even if condensation water accumulates in the lower part of the water storage tank body 22, the condensation water is blocked near the air intake part by the connecting part 23, and ventilation is performed in a nearby area, so that the condensation water is likely to dry out.

[0020] Next, as shown in Figures 7 and 8, in the structure for fixing the exterior tank T to the toilet body 4, tank legs 25 for fixing the exterior tank T to the toilet body 4 are provided at four locations on the exterior tank T. Note that, although the number of tank legs 25 provided is two in this embodiment, the number is not limited to this. The exterior tank T has tank-side bolt holes 27 for mounting, one on each side of the drain outlet, and the toilet body also has toilet-side bolt holes 29, one on each side, spaced at the same intervals. The two tank legs 25 are provided near the tank-side bolt holes 27. The exterior tank T and the toilet body 4 are attached by passing the mounting bolts 33 through the metal plate 31, the tank-side bolt holes 27 of the exterior tank T, and the toilet-side bolt holes 29 of the toilet body 4 in that order from above. With this configuration, the tank legs 25 protrude from the resin exterior tank T, and since molding using resin as a material allows for smaller tolerances than molding using ceramic as a material, no local stress is generated even if the exterior tank T comes into contact with the top surface of the toilet body 4, and therefore damage to the exterior tank T can be prevented. For example, if the legs protrude from the toilet body 4, the toilet body 4 is often made of ceramic, and in the worst case scenario, the difference between the legs could be as much as 3 mm in height.

[0021] Next, as shown in FIGS. 3 to 5, a water supply valve device 28 that stops the supply of flush water supplied from the first water supply pipe 24 via the constant flow valve 26 is provided inside the water storage tank body 22. The water supply valve device 28 includes a main valve 30 which is a water supply valve that opens and closes the water supply passage downstream of the constant flow valve 26 . Furthermore, the flush water tank apparatus 1 is equipped with an operating device 32 (operating lever 32a, drive rotation shaft 32b) which is an operating section for operating the water supply valve apparatus 28 when starting a toilet flush.

[0022] Next, the internal structure and operating mechanism of the water supply valve device 28 will be described in detail with reference to Figs. First, the water supply valve device 28 further includes a poppet valve 34, a float 36, a float-side pilot valve 38, and a float height adjustment mechanism M1. The poppet valve 34 is an operating side pilot valve that opens and closes the main valve 30 by rotating the operating lever 32a and the drive shaft 32b of the operating device 32. The float 36 moves up and down by buoyancy according to the water level WL in the water storage tank body 22. The float side pilot valve 38 opens and closes the main valve 30 by the up and down movement of the float 36. The float height adjustment mechanism M1, the details of which will be described later, is a mechanism for adjusting the height position of the float 36 in the up-down direction.

[0023] Next, the main structure of the main valve 30 portion of the water supply valve device 28 includes a main valve body 30a, which is a pilot-type diaphragm valve, a main valve seat 30b on which the main valve body 30a sits, and a pressure chamber 30c in which internal pressure moves the main valve body 30a relative to the main valve seat 30b. As a result, the water supply valve device 28 can be switched to either a water stopping state in which the main valve body 30a is seated on the main valve seat 30b to stop water flow, or a water supply state in which the main valve body 30a is separated from the main valve seat 30b to supply water. The pressure chamber 30c is provided with a poppet hole 34a and a float-side pilot hole 38a for releasing the pressure in the pressure chamber 30c. Furthermore, a poppet valve 34 is provided in a poppet hole 34a of the pressure chamber 30c so as to be able to open and close. This poppet valve 34 is connected to a driving rotation shaft 32b that connects the operating lever 32a and the water supply valve device 28. This driving rotation shaft 32b is rotatable about its axis in conjunction with manual operation of the operating lever 32a by the user, and forms part of an operating section for operating the water supply valve device 28. Furthermore, a float-side pilot hole 38a of the pressure chamber 30c is provided with a float-side pilot valve 38. This float-side pilot valve 38 can be opened and closed by the float 36 moving up and down according to the water level WL of the flush water in the water storage tank body 22.

[0024] In addition, a bleed hole (not shown) is provided in the main valve body 30a, and when the water flow is stopped, the bleed hole (not shown) connects the primary side flow path A of the first water supply pipe 24 to the inside of the pressure chamber 30c. Here, the poppet hole 34a is formed so that its opening area is larger than the opening area of ​​the float-side pilot hole 38a. Moreover, the poppet hole 34a is formed at a higher position than the float-side pilot hole 38a, as shown in FIG.

[0025] Furthermore, as shown in Figure 4, the water supply valve device 28 is normally in a water-stopped state, in which the poppet hole 34a and the float side pilot hole 38a are both closed, and the primary side flow path A of the first water supply pipe 24 is connected to the pressure chamber 30c through a bleed hole (not shown). As a result, the water pressure in the primary side flow path A of the first water supply pipe 24 and the pressure chamber 30c is the same water pressure (primary side flow path pressure α), and the secondary side flow path B of the first water supply pipe 24 is open to the atmosphere.Since the area on which the water pressure acts on the main valve body 30a is larger than the area of ​​the primary side flow path A, the main valve body 30a is pressed against the main valve seat 30b and is in a closed state.

[0026] Next, in the water supply valve device 28, when the poppet hole 34a is opened by the poppet valve 34 and / or the float side pilot hole 38a is opened by the float side pilot valve 38, cleaning water flows out of the pressure chamber 30c and the pressure in the pressure chamber 30c decreases. As a result, the main valve body 30a moves away from the main valve seat 30b to open the valve and enter a water discharge state.

[0027] In addition, in the water supply valve device 28, when the poppet hole 34a is closed by the poppet valve 34 and the float side pilot hole 38a is closed by the float side pilot valve 38, the pressure in the pressure chamber 30c again becomes the primary side flow path pressure α, the main valve body 30a moves toward the main valve seat 30b, and finally the valve is closed (water stop state). At this time, the cleaning water in the primary side flow path A is injected little by little into the pressure chamber 30c through the bleed hole, so that the main valve body 30a is closed (water-stopped state) a predetermined time later after the poppet hole 34a and the float side pilot hole 38a are closed. In addition, a jet pump unit 42 (details of which will be described later) connected via a vacuum breaker valve 40 is provided in the water supply passage downstream of the water supply valve device 28.

[0028] Next, the jet pump unit 42 will be described in detail with reference to FIGS. First, as shown in Figures 3 to 5, the jet pump unit 42 is provided downstream of the second water supply pipe 44 extending from the vacuum breaker valve 40, and includes, from upstream to downstream, a jet nozzle 46, a flow path switching valve 48, and a throat pipe 50. The second water supply pipe 44 is formed by a highly flexible hose 44a on the upstream side and a less flexible folded-back portion 45 on the downstream side. Flexibility here refers to the property that an object is soft and can be bent. In other words, the higher the flexibility, the easier it is for the material to undergo elastic deformation. In addition, each of the jet nozzle 46, the flow path switching valve 48, and the suction port 50a of the throat pipe 50 are arranged within a jet nozzle accommodating section H that protrudes downward from one of the left and right sides of the water storage tank body 22 (the right side when looking at the water storage tank body 22 from the front side in Figure 3).

[0029] As shown in Figures 3 to 5, the jet nozzle 46 of the jet pump unit 42 is positioned at least partially submerged inside the water storage tank body 22, and sprays cleaning water supplied from a second water supply pipe 44 extending from the vacuum breaker valve 40. The vacuum breaker valve 40 is provided to draw in air from the outside and prevent the inside of the second water supply pipe 44 from the vacuum breaker valve 40 to the jet nozzle 46 from becoming negative pressure.

[0030] Next, as shown in Figures 3 to 5, the flow path switching valve 48 of the jet pump unit 42 is provided near the downstream side of the jet nozzle 46, and is capable of switching the flow path of the cleaning water sprayed from the jet nozzle 46 depending on the water level WL in the water storage tank main body 22. 3 to 5, the throat pipe 50 of the jet pump unit 42 is provided in the vicinity of the downstream side of the flow path switching valve 48. A suction port 50a is formed at one end (upstream end) of the throat pipe 50, while a discharge port 50b for discharging the wash water is formed at the other end (downstream end) of the throat pipe 50. 4, the throat pipe 50 is divided into a throat ascending pipe 50c that guides flush water flowing in from the intake port 50a diagonally upward, and a throat downcomer pipe 50d that guides the raised flush water to the exhaust port 50b, and the pipe shape is, for example, an inverted U-shape (or, in other words, an inverted J-shape, or a gooseneck shape). As a result, even if the user starts the flushing operation, the flush water in the water storage tank body 22 decreases, and the part connecting the throat ascending pipe 50c and the throat downcomer pipe 50d rises above the flush water in the water storage tank body 22, flush water can be supplied to the toilet body. In addition, because the throat pipe 50 has an upwardly convex inverted U-shape, the flush water flowing into the suction port 50a must be discharged diagonally upward from the jet nozzle 46. Therefore, the second water supply pipe 44, which leads the flush water to the jet nozzle 46, has a turning section 45 which changes the flow of the flush water coming downward from the vacuum breaker valve 40 installed above the water storage tank body 22 to an upward direction.

[0031] Next, the folded portion 45 shown in Figs. 6 to 8 is made of PBT, which is a crystalline resin, and more specifically, a material that does not contain a highly sliding fluororesin is used (the second water supply pipe 44, excluding the folded portion 45, is made of EPDM, which has a lower hardness than PBT). With this configuration, the second water supply pipe 44 does not deform due to the high hardness of the folded portion 45, which has a large curvature and is more susceptible to resistance from the cleaning water, and the number of times the flow direction of the cleaning water in the second water supply pipe 44 changes suddenly can be reduced. This can suppress the decrease in the water force of the cleaning water in the second water supply pipe 44, and therefore the decrease in the water force of the cleaning water sprayed from the jet nozzle 46 toward the throat pipe 50, so it is possible to ensure the amount of cleaning water that can be drawn in when the water enters the throat pipe 50. Conventionally, the folded portion 45 was made of EPDM, so that when the cleaning water passed through the folded portion 45, the second water supply pipe 44 moved in a bending manner, which caused the water force in the second water supply pipe 44 to weaken.

[0032] 7, folded portion 45 is joined by ultrasonic welding of two parts, folded top surface portion 45a which is connected to jet nozzle 46 and forms the upper region of folded portion 45, and folded bottom surface portion 45b which forms the lower region. As a result, even if the flow rate of cleaning water flowing through folded portion 45 increases due to the effect of reducing water pressure loss and a large force is applied to folded portion 45, it is possible to prevent the folded top surface portion 45a and folded bottom surface portion 45b from coming apart because the folded top surface portion 45a and folded bottom surface portion 45b are welded with high adhesive strength. Here, the jet nozzle 46 is disposed so as to face the suction port 50a of the throat pipe 50. The suction port 50a of the throat pipe 50 and the jet nozzle 46 are always submerged in the water storage tank body 22.

[0033] 8, the turning portion 45 has a constant curvature, and the water flowing through the second water supply pipe 44 changes according to a rule, so that the flow in the flow path is kept straight and the water pressure loss can be reduced. Specifically, the turning portion 45 has a semicircular shape in a plan view and a constant flow diameter.

[0034] Also, as shown in Figures 3 and 4, the flow path switching valve 48 is capable of switching the flow path of the jetted flushing water to either a toilet flushing flow path 52 that communicates with the toilet body 4 side, or a tank water storage flow path 54 that communicates with the water storage tank body 22 side, depending on the water level WL in the water storage tank body 22. Specifically, the toilet flushing flow path 52 is a flow path that, when flushing the bowl portion 6 of the toilet body 4, the suction port 50a of the throat pipe 50 is opened by the flow path switching valve 48, and flush water jetted from the jet nozzle 46 flows into the suction port 50a of the throat pipe 50. Due to this flow path, the flush water that flows into the throat pipe 50 flows out the discharge port 50b of the throat pipe 50, and is discharged from the drain port 14 of the flush water tank device 1 to the water conduit 16 side of the toilet body 4. On the other hand, the tank water storage flow path 54 is a flow path in which, when water is stored in the water storage tank main body 22, the suction port 50a of the throat pipe 50 is closed by the flow path switching valve 48, and the cleaning water jetted from the jet nozzle 46 is directed into the water storage tank main body 22 outside the throat pipe 50 without flowing into the throat pipe 50.

[0035] Incidentally, when the flow path switching valve 48 is set to the toilet flushing flow path 52, the jet nozzle 46 jets flush water from the suction port 50a of the throat pipe 50 toward the inside, thereby inducing a so-called "jet pump effect" in which the flow rate of flush water flowing through the throat pipe 50 is increased beyond the flow rate of flush water jetted from the jet nozzle 46. As a result, flush water at an increased flow rate is supplied from the discharge port 50b of the throat pipe 50 through the drain port 14 toward the water conduit 16 of the toilet body 4. In addition, the term "jet pump action" used in this specification means that the forceful flow of flushing water sprayed from the jet nozzle 46 toward the suction port 50a of the throat pipe 50 creates a negative pressure that directly draws in the surrounding flushing water, such as near the suction port 50a of the throat pipe 50, without relying on other mechanical elements such as a pump, and uses this negative pressure to transport the flushing water in the water storage tank body 22 that has been sucked into the throat pipe 50 toward the toilet body 4.

[0036] 4 and 5, an overflow pipe 56 extending in the vertical direction is provided in the water storage tank body 22. This overflow pipe 56 is provided adjacent to the downcomer pipe portion 38b extending in the vertical direction of the throat pipe 50 of the jet pump unit 42, and its lower end is connected to the drain outlet 14. As a result, when the water level WL in the water storage tank body 22 rises above the stop water level WL0 and exceeds the position of the overflow outlet 56a of the overflow pipe 56, the flushing water flows into the overflow pipe 56 and is supplied as make-up water to the water conduit 16 of the toilet body 4 from the drain outlet 14. Furthermore, as shown in Figs. 3 to 5, a branch pipe 58 is provided inside the water storage tank body 22, connecting a part of the tank water storage flow path 54 to the overflow port 56a. As a result, a portion of the flush water in the tank water storage flow path 54 flows into the overflow pipe 56 via the branch pipe 58, and is supplied to the water conduit 16 of the toilet body 4 from the drain outlet 14, and is ultimately used as make-up water to form a seal in the toilet body 4.

[0037] 9 and 10, the branch pipe 58 is fixed together with the throat pipe 50 and the jet nozzle 46 by a screw 59. The branch pipe 58 has a rotation stopper protrusion 58a, and the jet nozzle 46 has a rotation stopper recess 46b, which are fitted together to provide a fitting means in addition to the screw fastening. Normally, since it is fixed with three parts, the amount of deformation would increase due to stress relaxation of the resin, resulting in the screw loosening and changing the relative position of the jet nozzle 46 and the throat pipe 50, which would have an adverse effect on the jet pump performance. However, by providing another fitting means in addition to the screw fastening, it is possible to suppress the screw loosening, and thereby reduce the adverse effect on the jet pump performance.

[0038] In addition, branch pipe 58 is provided with a snap fit 61 for fixing to jet nozzle 46 during assembly. Since snap fit 61 and jet nozzle 46 are designed to have a small gap after fixing, the force of cleaning water received by branch pipe 58 is not transmitted to snap fit 61. When branch pipe 58 rotates due to the force of cleaning water, it tries to rotate in rotation direction e around rotation center O, so contact point P becomes the contact point between branch pipe 58 and jet nozzle 46.

[0039] Next, as shown in Figures 4 and 5, the flush water tank device 1 is equipped with a large / small flush switching device 60 provided within the water storage tank main body 22, and this large / small flush switching device 60 makes it possible to switch between either the large flush mode or the small flush mode. The large / small flush switching device 60 also includes a small tank 62 for switching between large and small flushes, which is provided within the water storage tank body 22 , and a large / small flush switching valve device 64 provided in this small tank 62 . As shown in FIG. 4, when the large / small flush switching device 60 is switched to the large flush mode, the switching valve body 64a of the large / small flush switching valve device 64 is in an open state, thereby opening the switching opening 62a of the small tank 62. On the other hand, when the large / small flush switching device 60 is switched to the small flush mode, the switching valve body 64a of the large / small flush switching valve device 64 is in a closed state, thereby closing the switching opening 62a of the small tank 62. [Explanation of symbols]

[0040] 1 Flush water tank apparatus according to a first embodiment of the present invention 2 Flush toilet 4. Toilet body 6 Bowl section 8 Rim 10 Shelf 12 Trap drain 12a Trap drain inlet 12b Trap riser 12c Trap Downcomer 14 Drain 16 Water channel of the toilet body 16a First Waterway 16b Second Waterway 18 First rim outlet 20 Second rim outlet 21 Intake section 22 Water tank body 23 Sekibe 24 First water supply pipe 25 Tank legs 26 Constant flow valve 27 Tank side bolt hole 28 Water supply valve device 28a Main body of water supply valve device 28b Hinge part 29 Toilet side bolt hole 30 Main valve (water supply valve) 30a Main valve body 30b Main valve seat 30c Pressure chamber 31 Gold plate 32 Operation device (operation unit) 32a Operating lever (operating part) 32b Drive shaft (operation part) 33 Mounting bolt 34 Poppet valve 34a Poppet hole 36 Float 36a Float body 36b Float shaft 36c Male thread groove (male thread) 36d Vertical recess for restricting float shaft rotation (float shaft rotation restricting portion, fitting recess) 36e Short side of float body 36f Long side of float body 38 Float side pilot valve 38a Float side pilot hole 40 Vacuum breaker valve 42 Jet pump unit 44 Second water supply pipe 44a Hose part 46 Jet Nozzle 46a Rotation stop recess 45 Folded part 45a Folded top part 45b Folded bottom part 48 Flow path switching valve 50 Throat tube 50a Suction port 50b outlet 50c throat riser 50d throat downcomer 52 Toilet flushing channel 54 Tank water storage channel 56 Overflow pipe 56a Overflow port 58 Branch Pipe 58a Rotation stopper protrusion 59 Screw 60 Large and small cleaning switch device 61 Snap Fit 62 Small tank for switching between large and small cleaning 62a Switching opening 64 Large / small flushing switching valve device (large / small flushing switching valve) 64a Switching valve body A Primary flow path of water supply pipe B Secondary flow path of water supply pipe T Exterior tank O Rotation Center e Rotation direction P Contact Point WL Water Level WL0 Water stop level

Claims

1. A flush toilet device that uses a jet pump action to supply flush water to the toilet body to flush the toilet, A toilet body having a bowl portion for receiving waste and a water channel for directing flushing water to the bowl portion; a water storage tank body that stores flush water to be supplied to the toilet body; a jet pump unit disposed at least partially submerged within the water storage tank body and supplying flush water within the water storage tank body to the toilet body; The water storage tank body has a discharge port connected to the water channel, The jet pump unit includes an ascending pipe extending obliquely upward from a suction port formed below the jet pump unit, and a throat pipe including a descending pipe connected to the ascending pipe and extending downward toward a discharge port; a jet nozzle for injecting cleaning water toward a suction port of the throat pipe to induce a jet pump action; a water supply valve for turning on and off the supply of cleaning water from a water source to the jet nozzle; a water supply pipe connecting the water supply valve and the jet nozzle; Equipped with The water supply pipe is composed of a folded portion connected to a jet nozzle and having the largest curvature, and a hose portion excluding the folded portion, and the folded portion is less flexible than the hose portion, A flush water tank apparatus characterized in that the folded portion is composed of a folded upper surface portion that forms the ceiling surface and a folded bottom surface portion that forms the bottom surface, and the folded upper surface portion and the folded bottom surface portion are fitted together by welding.

2. 2. A flush water tank apparatus according to claim 1, wherein said folded portion has a constant curvature.

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