Cleaning water supply device

Abstract

To prevent back flow and stagnation of washing water.SOLUTION: A washing water supply device comprises a tank, a vacuum breaker, a water discharge port, an introduction port, and washing water guide means. The tank stores washing water for a toilet bowl body. The vacuum breaker comprises: a water passage including a water inlet port and a water outlet port; an atmosphere introduction port making the water passage communicate with the outside; a valve body that makes the water inlet port communicate with the water outlet port at the time of water passing and makes the water passage communicate with the atmosphere introduction port at the time of non-water passing; and a water reception part for receiving washing water overflowing from the atmosphere introduction port. The water discharge port discharges washing water received by the water reception part. The introduction port introduces washing water into a discharge water tank for storing washing water from the water discharge port. The washing water guide means is provided between the water discharge port and the introduction port and guides washing water from the water discharge port to the introduction port. Washing water from the water discharge port is discharged to the washing water guide means via an atmosphere open space and washing water discharged to the washing water guide means is discharged to the introduction port via an atmosphere open space.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The disclosed embodiments relate to a wash water supply device. [Background technology]

[0002] Some flush water supply devices that supply flush water for flushing toilets are equipped with a vacuum breaker, and the vacuum breaker has a water receiving section that receives flush water that overflows from the atmospheric inlet to prevent water leakage outside the machine even if the atmospheric inlet cannot be blocked, and the flush water is discharged from the water receiving section into a drain tank.

[0003] Conventionally, in a flush water supply device, a structure is known in which a flow path from a water receiving part to a drainage tank is connected by a hose, which serves both to drain water from the water receiving part to the drainage tank and to draw in and exhaust air (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-190489 [Patent Document 2] Japanese Patent Application Publication No. 2018-109335 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional flush water supply device described above, the flush water is discharged after ensuring an intake and exhaust area within the hose, which increases the pressure loss when discharging, so the wall height of the water receiving section needs to be high enough to prevent water leakage, but from the perspective of miniaturization (low silhouette), the wall height of the water receiving section cannot be made high.

[0006] When downsizing the above-mentioned conventional flush water supply device, there is a possibility that flush water overflowing from the inlet of the drain tank will flow back. Also, if a large amount of flush water is discharged from the water receiving section, it may not be discharged from the drain outlet, and the flush water may stagnate.

[0007] One aspect of the embodiment aims to provide a flush water supply device that can prevent backflow and stagnation of flush water. [Means for solving the problem]

[0008] A flush water supply device according to one aspect of the embodiment comprises a tank for storing flush water to be supplied to a toilet body, a water passage having a water inlet on the upstream side and a water outlet on the downstream side, an air inlet that connects the water passage with the outside, a valve body provided inside the water passage and operated by the water pressure of the flush water to connect the water inlet with the water outlet when water is flowing and to connect the water passage with the air inlet when water is not flowing, and a vacuum breaker having a water receiving portion that receives flush water that overflows from the air inlet; The washing machine is provided with a drain outlet for discharging flushing water received in the water receiving section, and an inlet for introducing flushing water into the inside of a drain tank that stores the flushing water discharged from the drain outlet, and further includes flushing water guiding means that is provided between the drain outlet and the inlet and guides the flushing water discharged from the drain outlet to the inlet, and the flushing water discharged from the drain outlet is discharged to the flushing water guiding means via a space open to the atmosphere, and the flushing water discharged to the flushing water guiding means is discharged to the inlet via a space open to the atmosphere.

[0009] With this configuration, by discharging wash water from the drain outlet to the wash water guide means by spatial water discharge, and discharging wash water from the wash water guide means to the inlet by spatial water discharge, it is possible to prevent wash water from flowing back even if, for example, the drain tank becomes full and wash water overflows from the inlet, and it is also possible to prevent wash water from stagnating even if, for example, a large amount of wash water is discharged from the drain outlet.

[0010] In the above flush water supply device, the flush water guiding means has changing means for receiving flush water discharged from the drain outlet and changing the drainage center of the received flush water to the inlet.

[0011] With this configuration, by changing the center of drainage to the cleaning water inlet using the change means, splashing of cleaning water discharged from the drain outlet can be suppressed and backflow of cleaning water can be more reliably prevented.

[0012] In the flush water supply device, the changing means has a downwardly sloping surface along which flush water discharged from the drain outlet flows.

[0013] With this configuration, the flush water flows along the downward slope, which allows the center of drainage to the flush water inlet to be changed, thereby suppressing splashing of flush water discharged from the drain outlet and more reliably preventing backflow of flush water.

[0014] In the above-mentioned flush water supply device, the flush water guide means discharges the flush water from a position that is not directly above the inlet.

[0015] With this configuration, the flush water guide means discharges flush water from a position that is not directly above the inlet, so even if flush water overflows from the inlet, the overflowing flush water can be prevented from directly entering the flush water guide means.

[0016] The flush water supply device is provided with a drain pipe extending downward from the drain outlet, the drain pipe overlapping the flush water guide means.

[0017] With this configuration, the drain pipe extending downward from the drain outlet overlaps with the flush water guide means, which can suppress splashing of the flush water discharged from the drain outlet and more reliably prevent backflow of the flush water.

[0018] In the above-mentioned flushing water supply device, the flushing water guiding means has a change means for receiving flushing water discharged from the drain outlet and changing the drainage center of the received flushing water to the inlet, the change means having a first change section that becomes a downward sloping surface along which the flushing water discharged from the drain outlet flows, and the change means further has a second change section that extends above the inlet drainage pipe to the inlet and becomes a downward sloping surface in the inlet drainage pipe along which the flushing water from the first change section flows.

[0019] With this configuration, the change means has an offset structure having a first change section (downward inclined surface) and a second change section (downward inclined surface), which makes it possible to suppress splashing of cleaning water discharged from the drain outlet and more reliably prevent backflow of cleaning water.

[0020] The flush water supply device is provided with a drain pipe extending downward from the drain outlet, and the drain pipe has ribs provided on the inner peripheral surface of the drain pipe.

[0021] With this configuration, the ribs on the inner circumferential surface of the drainage pipe can regulate the flow of flush water discharged from the drainage pipe, thereby stabilizing the discharge of flush water from the drainage pipe, such as by preventing the flush water from spreading. [Effects of the Invention]

[0022] According to one aspect of the embodiment, backflow and stagnation of cleaning water can be prevented. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is an overall structural diagram showing a flush toilet equipped with a flush water supply device according to an embodiment. [Figure 2] FIG. 2 is a perspective view of the periphery of a vacuum breaker in the cleaning water supply device. [Figure 3] FIG. 3 is a plan view of the vicinity of a vacuum breaker in the cleaning water supply device. [Figure 4]FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is a schematic side cross-sectional view (part 1) of a tank joint. [Figure 6] FIG. 6 is a schematic side cross-sectional view (part 2) of the tank joint. [Figure 7] FIG. 7 is a perspective view showing a drainage pipe. [Figure 8] FIG. 8 is a diagram (part 1) showing the flow of flush water in the drainage pipe. [Figure 9] FIG. 9 is a diagram (part 2) showing the flow of flush water in the drainage pipe. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, with reference to the accompanying drawings, an embodiment of the flush water supply device disclosed in the present application will be described in detail. Note that the present invention is not limited to the embodiment shown below. It should be noted that the drawings are schematic, and the dimensional relationships and ratios of each element may differ from reality. The dimensional relationships and ratios may differ between the drawings.

[0025] <Flush water supply device and flush toilet> First, a flush water supplying apparatus 1 and a flush toilet 100 according to an embodiment will be described with reference to Figure 1. Figure 1 is an overall structural diagram showing a flush toilet 100 equipped with a flush water supplying apparatus 1 according to an embodiment.

[0026] As shown in Figure 1, a flush toilet 100 comprises, for example, a toilet body 200 that is placed on the floor of a toilet room, and a flush water supply device 1 that is positioned behind the toilet body 200 and supplies flush water to the toilet body 200.

[0027] The toilet body 200 comprises a bowl portion 210 that receives waste, and a drain trap pipe 220 that extends rearward from the bottom of the bowl portion 210. The bowl portion 210 is formed with a rim spout 212 that spouts water from the rim and a jet spout 214 that spouts water in a jet. The rim spout 212 is formed at the rear of the top of the bowl portion 210, and spouts flushing water along the upper edge of the bowl portion 210.

[0028] Jet water outlet 214 is formed at the bottom of bowl portion 210 and discharges flush water toward drain trap pipe 220. Discharge of flush water from jet water outlet 214 rapidly fills drain trap pipe 220 with flush water, allowing siphon action to occur early. Drain trap pipe 220 forms a water seal and is connected to sewer piping (not shown).

[0029] The cleaning water supply device 1 comprises a valve unit 600 controlled by a control unit not shown, a tank 800 located downstream of the valve unit 600 for storing cleaning water, and a pressure pump 900 located downstream within the tank 800 for pressurizing the cleaning water.

[0030] A water supply passage 310, which supplies flush water from a water supply source (not shown), is connected to the upstream side of the valve unit 600. In addition, a rim-side water supply passage 320, which supplies flush water to the rim spout 212, and a tank-side water supply passage 330, which supplies flush water to the tank 800, are connected to the downstream side of the valve unit 600.

[0031] The valve unit 600 includes a constant flow valve 620, a diaphragm-type water supply valve 640 located downstream of the constant flow valve 620, a switching valve 660 located downstream of the water supply valve 640, and a vacuum breaker 680 located downstream of the switching valve 660.

[0032] Constant flow valve 620 keeps the flow rate of flush water that flows into constant flow valve 620 from water supply passage 310 and flows downstream constant. Water supply valve 640 is configured, for example, to include a diaphragm, and by opening and closing this, it switches between spouting and stopping flush water at rim spout 212 and jet spout 214.

[0033] The switching valve 660 switches the supply destination of flush water from the water supply source, for example, between the rim spout 212 of the toilet body 200 and the tank 800. In other words, the switching valve 660 supplies flush water to either the rim-side water supply passage 320 or the tank-side water supply passage 330.

[0034] Vacuum breaker 680 prevents backflow of flush water. The specific configuration of vacuum breaker 680 will be described later. Note that in vacuum breaker 680, flush water may overflow into water receiving section 686 due to malfunction of valve body 683, but the flush water that overflows into water receiving section 686 is collected by water receiving section 686 and then discharged into tank 800 via drain outlet 687a of drain section 687 (see Figure 3). In other words, tank 800 also functions as a drain tank that stores flush water discharged from drain outlet 687a.

[0035] The tank 800 stores flush water to be supplied to the jet water outlet 214 of the toilet body 200. The pump-side water supply passage 340 is connected to the bottom of the tank 800, and the pressure pump 900 is connected to the downstream end of the pump-side water supply passage 340.

[0036] Additionally, an overflow flow path 342 is connected to the top of the tank 800. The overflow flow path 342 causes flush water to flow out into the toilet body 200 when, for example, flush water equal to or above the specified water level WL is supplied inside the tank 800. In particular, the overflow flow path 342 causes flush water that has reached the specified water level WL or above to flow out into the jet spout 214 of the toilet body 200 via the jet-side water supply path 350, without passing through the pressure pump 900.

[0037] The pressure pump 900 is connected to the jet water spouting port 214 by the jet-side water supply passage 350 , and pressurizes the flush water stored in the tank 800 and supplies it to the jet water spouting port 214 via the jet-side water supply passage 350 .

[0038] <Vacuum breaker> Next, the vacuum breaker 680 according to the embodiment will be described with reference to Figures 2 to 4. Figure 2 is a perspective view of the area around the vacuum breaker 680 in the wash water supplying apparatus 1. Figure 3 is a plan view of the area around the vacuum breaker 680 in the wash water supplying apparatus 1. Note that Figure 3 shows the vacuum breaker 680 with the cover 682 removed. Figure 4 is a cross-sectional view taken along line IV-IV in Figure 3.

[0039] Vacuum breaker 680 includes a main body 681, a cover 682, and a valve body 683. Main body 681 includes a water passage portion 685, a water receiving portion 686, a drainage portion 687, and a guide portion 688. Main body 681 is formed with first atmosphere inlet 690a and second atmosphere inlet 690b, which are atmosphere inlets.

[0040] A first water passage 691a and a second water passage 691b are formed in the water passage section 685. The first water passage 691a is a flow path that connects one outlet of the switching valve 660 and the tank-side water supply passage 330. Specifically, the first water passage 691a connects a water inlet (first water inlet) 692a, through which flush water flows in from one outlet of the switching valve 660, and a water outlet (first water outlet) 693a, through which flush water flows out into the tank-side water supply passage 330.

[0041] The second water passage 691b is a flow path that connects the other outlet of the switching valve 660 and the rim-side water supply passage 320. Specifically, the second water passage 691b connects a water inlet (second water inlet) 692b, into which flush water flows in from the other outlet of the switching valve 660, and a water outlet (second water outlet) 693b, through which flush water flows out into the rim-side water supply passage 320.

[0042] Water passage portion 685 is formed with a first hole 695a communicating with first water passage 691a and a second hole 695b communicating with second water passage 691b. First hole 695a and second hole 695b are formed above water passage portion 685. A first protrusion 696a of water receiving portion 686 is inserted into first hole 695a. A second protrusion 696b of water receiving portion 686 is inserted into second hole 695b.

[0043] Water receiving portion 686 is provided above water passage portion 685. The upper end of water receiving portion 686 is open, and cover 682 is attached thereto.

[0044] The water receiving portion 686 includes a first protrusion 696a and a second protrusion 696b. The first protrusion 696a protrudes downward from the bottom surface of the water receiving portion 686. A first atmosphere inlet 690a, which is an atmosphere inlet, is formed in the first protrusion 696a. The first atmosphere inlet 690a is formed to penetrate the first protrusion 696a in the vertical direction. In other words, the first atmosphere inlet 690a is formed to penetrate the bottom 697 of the water receiving portion 686 in the vertical direction. The first atmosphere inlet 690a communicates with a first water passage 691a.

[0045] The second protrusion 696b protrudes downward from the lower surface of the water receiving portion 686. A second atmosphere inlet 690b, which is an atmosphere inlet, is formed in the second protrusion 696b. The second atmosphere inlet 690b is formed to penetrate the second protrusion 696b in the vertical direction. In other words, the second atmosphere inlet 690b is formed to penetrate the bottom 697 of the water receiving portion 686 in the vertical direction. The second atmosphere inlet 690b communicates with the second water passage 691b.

[0046] The bottom 697 of the water receiving portion 686 includes a plurality of regions with different heights. Specifically, the bottom 697 of the water receiving portion 686 includes a first bottom portion 697a, a second bottom portion 697b, a third bottom portion 697c, and a fourth bottom portion 697d.

[0047] First bottom portion 697a has the highest bottom surface among bottom portions 697, and first atmosphere inlet port 690a is formed therein. The bottom surface of second bottom portion 697b is lower than the bottom surface of first bottom portion 697a. Second atmosphere inlet port 690b is formed in second bottom portion 697b. The bottom surface of third bottom portion 697c is lower than the bottom surface of second bottom portion 697b. The bottom surface of fourth bottom portion 697d is lower than third bottom portion 697c. In other words, the bottom surfaces of first bottom portion 697a, second bottom portion 697b, third bottom portion 697c, and fourth bottom portion 697d decrease in height in this order. A drainage portion 687 is provided in fourth bottom portion 697d. The bottom surface of third bottom portion 697c may be at the same height as the bottom surface of second bottom portion 697b.

[0048] Water receiving portion 686 receives the cleaning water that overflows from first atmosphere inlet 690a and second atmosphere inlet 690b. An outer peripheral wall portion 698 is formed on the periphery of water receiving portion 686.

[0049] Guide portion 688 guides wash water that overflows from first atmosphere inlet 690a to second atmosphere inlet 690b. Guide portion 688 is a wall portion that protrudes upward from the bottom surface of water receiving portion 686. Hereinafter, guide portion 688 will be referred to as "wall portion 688." Wall portion 688 is provided inside outer peripheral wall portion 698. Wall portion 688 guides wash water that overflows from first atmosphere inlet 690a to second atmosphere inlet 690b. Wall portion 688 is provided to surround first atmosphere inlet 690a. Wall portion 688 protrudes upward from the periphery of first bottom portion 697a.

[0050] Wall portion 688 includes a first wall portion 688a and a second wall portion 688b. Second wall portion 688b is shorter than first wall portion 688a. Second wall portion 688b is provided closer to drainage portion 687 than first wall portion 688a or closer to second atmosphere inlet port 690b than first wall portion 688a.

[0051] An opening 688c is formed in wall portion 688. Opening 688c is provided on the second atmosphere inlet port 690b side. Opening 688c is formed by wall portion 688 being discontinuous around second atmosphere inlet port 690b, and opens toward second atmosphere inlet port 690b. For example, opening 688c is formed by not connecting the end of first wall portion 688a on the second atmosphere inlet port 690b side and the end of second wall portion 688b on the second atmosphere inlet port 690b side.

[0052] The height of wall portion 688 is lower than the height of outer peripheral wall portion 698. Specifically, the height of wall portion 688 is lower than the height of outer peripheral wall portion 698 protruding upward from first bottom portion 697a, second bottom portion 697b, and third bottom portion 697c.

[0053] Drainage section 687 drains the flushing water in water receiving section 686. Drainage section 687 drains the flushing water in water receiving section 686 into tank 800. Drainage section 687 drains the flushing water in water receiving section 686 into tank 800 via tank joint 702. Tank joint 702 is provided above tank 800, and allows flushing water discharged from drainage port 687a to flow into tank 800.

[0054] Furthermore, the drainage portion 687 protrudes downward from the fourth bottom portion 697d of the water receiving portion 686. As described above, the drainage portion 687 is formed with the drainage opening 687a. The drainage opening 687a is formed along the up-down direction. The drainage opening 687a is formed to penetrate the fourth bottom portion 697d of the water receiving portion 686.

[0055] Valve element 683 switches between a communication state between first water passage 691a and the outside and a communication state between second water passage 691b and the outside by opening and closing first atmosphere inlet 690a and second atmosphere inlet 690b. Valve element 683 includes a first valve element 683a and a second valve element 683b.

[0056] First valve body 683a moves up and down due to the water pressure of flush water flowing through first water passage 691a. When flush water flows through first water passage 691a, i.e., tank-side water supply passage 330, and water is passing through (when water is passing through), first valve body 683a rises due to the water pressure of the flush water and seats on the lower end of first protrusion 696a. As a result, first valve body 683a blocks the lower end of first atmosphere inlet port 690a, closing first atmosphere inlet port 690a. When first water passage 691a is in a water passing state, first valve body 683a closes first atmosphere inlet port 690a, preventing communication between first water passage 691a and the outside.

[0057] Furthermore, when first water passage 691a is not flowing (in a non-flowing state), first valve body 683a descends under its own weight, moves away from the lower end of first protrusion 696a, and opens the lower end of first atmosphere inlet 690a, thereby opening first atmosphere inlet 690a. When first water passage 691a is not flowing, first valve body 683a opens first atmosphere inlet 690a, connecting first water passage 691a to the outside and allowing outside air to be introduced into first water passage 691a. This prevents negative pressure from building up inside first water passage 691a and prevents backflow of flush water in first water passage 691a, i.e., tank-side water supply passage 330.

[0058] The second valve body 683b moves up and down due to the water pressure of flush water flowing through the second water passage 691b. When flush water flows through the second water passage 691b, i.e., the rim-side water supply passage 320, and water is passing through (when water is passing through), the second valve body 683b rises due to the water pressure of the flush water and seats on the lower end of the second protrusion 696b. As a result, the second valve body 683b closes the lower end of the second atmosphere introduction port 690b, and closes the second atmosphere introduction port 690b. When the second water passage 691b is in a water passing state, the second valve body 683b closes the second atmosphere introduction port 690b, and does not communicate between the second water passage 691b and the outside.

[0059] Furthermore, when second water passage 691b is not passing water (in a non-water-passing state), second valve body 683b descends under its own weight, moves away from the lower end of second protrusion 696b, and opens the lower end of second atmosphere inlet port 690b, thereby opening second atmosphere inlet port 690b. When second water passage 691b is not passing water, second valve body 683b opens second atmosphere inlet port 690b, connecting second water passage 691b to the outside and allowing outside air to be introduced into second water passage 691b. This prevents negative pressure from building up inside second water passage 691b and prevents flush water from flowing back through second water passage 691b, i.e., rim-side water supply passage 320.

[0060] In vacuum breaker 680, first valve body 683a and second valve body 683b move up and down depending on the state of flush water in first water passage 691a and second water passage 691b. When flush water is flowing in each water passage, first atmosphere inlet port 690a and second atmosphere inlet port 690b are closed by first valve body 683a and second valve body 683b, respectively.

[0061] When first water passage 691a (tank-side water supply passage 330) is in a flowing state, for example, debris may become caught between first valve body 683a and the lower end of first protrusion 696a. In such a case, first valve body 683a may malfunction, and first valve body 683a may not be able to close first atmosphere inlet 690a. If first atmosphere inlet 690a cannot be closed, cleaning water flows from first water passage 691a to first atmosphere inlet 690a, and overflows from first atmosphere inlet 690a into water receiver 686.

[0062] For this reason, the wall height of water receiving portion 686 needs to be high enough to prevent water leakage, but from the viewpoint of miniaturization (low silhouette), the wall height of water receiving portion 686 cannot be made high.

[0063] In this embodiment, the tank joint 702 is provided with a flush water guide means 750 that guides flush water discharged from the drain outlet 687a to the inlet 801 of the tank 800, and the flush water W1 discharged from the drain outlet 687a is discharged to the flush water guide means 750 through a space S1 open to the atmosphere (see Figure 6), and the flush water W1 discharged to the flush water guide means 750 is discharged to the inlet 801 through a space S2 open to the atmosphere (see Figure 6), thereby enabling quick discharge from the water receiving section 686 to the tank 800 without increasing the wall height of the water receiving section 686, thereby improving drainage capacity.

[0064] <Wash water guide means> Next, with reference to Figures 5 and 6, we will explain the flush water guide means 750 provided in the tank joint 702. Figures 5 and 6 are schematic side cross-sectional views of the tank joint 702. In Figure 6, the flow of flush water W1, W2 is shown by arrows.

[0065] In order to achieve a smaller size (low silhouette) to improve the design of the flush toilet 100 (see Figure 1), in the flush water supply device 1 (see Figure 1), as shown in Figure 5, the rise in water level when negative pressure is applied must be limited to a certain extent to prevent overflow by the vertical distance D1 from the position L0 where the backflow prevention mechanism functions to the water surface in the water receiving section 686 above the overflow surface L2 (overflow level L1), and therefore the vertical distance D2 between the overflow level L1 and the overflow surface L2 must be reduced. Note that overflow level L1 indicates the water level at the maximum overflow amount from the tank 800 in the flush water supply device 1.

[0066] In this way, in order to reduce the size of the cleaning water supply device 1, it is necessary to lower the overflow level L1 as well as the position L0 at which the backflow prevention mechanism functions. However, in order to lower the overflow level L1, it is necessary to suppress the backflow of cleaning water W2 (see Figure 6) from the inlet 801 of the tank 800.

[0067] 5, tank joint 702 is disposed between drain outlet 687a and inlet 801 of tank 800. Drain outlet 687a discharges cleaning water W1 (see FIG. 6) received in water receiving section 686. Drain outlet 687a communicates with the interior of water receiving section 686.

[0068] Drain outlet 687a is provided with a drain pipe 760 that continues from drain outlet 687a and extends downward from the bottom surface of water receiving portion 686. Therefore, flush water W1 received in water receiving portion 686 is discharged from outlet 761 of drain pipe 760 via drain outlet 687a. Drain pipe 760 overlaps with changing means 751 (first changing portion 751a) of flush water guiding means 750, which will be described later. In other words, when viewed from above, outlet 761 of drain pipe 760 is located above changing means 751 (first changing portion 751a) of flush water guiding means 750.

[0069] Inlet 801 is an opening for introducing cleaning water W1 into the inside of tank 800, which functions as the drainage tank for storing cleaning water W1 discharged from drain outlet 687a. Inlet 801 is formed in the top of tank 800.

[0070] The flush water W1 discharged from the drain outlet 687a is discharged to the inlet 801 via the tank joint 702.

[0071] Flush water guiding means 750 is provided inside tank joint 702. That is, flush water guiding means 750 is provided between drain outlet 687a and inlet 801. Flush water guiding means 750 guides flush water W1 discharged from drain outlet 687a to inlet 801.

[0072] The flush water guiding means 750 receives flush water W1 discharged from the drain outlet 687a and has a changing means 751 that changes the drainage center O1 of the received flush water W1 to the inlet 801. Specifically, the flush water guiding means 750 changes the drainage center O1 of the flush water W1 to the inlet 801 to a drainage center O2. The changing means 751 also has a first changing section 751a and a second changing section 751b.

[0073] The first changing section 751a has a sloped downward inclined surface that allows the flush water W1 discharged from the drain outlet 687a to flow downward.

[0074] Similar to the first changing section 751a, the second changing section 751b has a sloped downward inclined surface. This downward inclined surface is an inclined surface that allows the flush water W1 discharged from the first changing section 751a to flow downward. The downward inclined surface of the second changing section 751b is formed so that the flush water W1 flows in a different direction from the first changing section 751a. The second changing section 751b slopes downward toward the first changing section 751a so that it forms a zigzag path together with the first changing section 751a in a side view.

[0075] Further, the second change portion 751b extends to above the inlet drainage pipe 802 leading to the inlet 801. That is, the second change portion 751b forms a downwardly inclined surface above the inlet drainage pipe 802.

[0076] In this way, the changing means 751 has an offset structure with respect to the check valve 803 of the tank 800 by the first changing portion 751a and the second changing portion 751b.

[0077] At the most downstream side of second changing section 751b, an outlet section 752 is provided which serves as an outlet for flush water W1 of tank joint 702 (flush water guiding means 750). Outlet section 752 is positioned away from directly above inlet 801. As a result, flush water guiding means 750 discharges flush water W1 from a position away from directly above inlet 801.

[0078] As shown in Figure 6, tank joint 702 discharges flush water W1 discharged from drain outlet 687a to flush water guiding means 750 (first change section 751a) via space S1 open to the atmosphere. Cleansing water guiding means 750 discharges flush water W1 from first change section 751a to second change section 751b. Furthermore, tank joint 702 discharges flush water W1 discharged to flush water guiding means 750 (second change section 751b) to inlet 801 via space S2 open to the atmosphere. Because spaces S1 and S2 open to the atmosphere are passed through, even if tank joint 702 is filled with flush water, it is possible to prevent the level of flush water W2 overflowing from tank 800 from rising due to capillary action.

[0079] With this configuration, flush water W1 is discharged from drain outlet 687a to flush water guiding means 750 by spatial spouting, and flush water W1 is also discharged from flush water guiding means 750 to inlet 801 by spatial spouting, thereby preventing flush water W2 from flowing back even if, for example, tank 800 becomes full and flush water W2 overflows from inlet 801. Furthermore, even if, for example, a large amount of flush water W1 is discharged from drain outlet 687a, flush water W1 can be prevented from stagnating.

[0080] In addition, by changing the drainage center O1 to the inlet 801 of the cleaning water W1 using the change means 751, splashing of the cleaning water W1 discharged from the drain outlet 687a can be suppressed and backflow of the cleaning water W2 can be more reliably prevented.

[0081] Furthermore, by causing flush water W1 to flow along the downwardly sloping surfaces of first changing section 751a and second changing section 751b, the drainage center O1 of flush water W1 to inlet 801 can be changed to drainage center O2. This makes it possible to suppress splashing of flush water W1 discharged from drain outlet 687a and more reliably prevent backflow of flush water W2.

[0082] Furthermore, since the cleaning water guide means 750 discharges the cleaning water W1 from a position that is not directly above the inlet 801, even if the cleaning water W2 overflows from the inlet 801, the overflowing cleaning water W2 can be prevented from directly penetrating into the cleaning water guide means 750.

[0083] In addition, since the drain pipe 760 extending downward from the drain outlet 687a overlaps with the flush water guide means 750, splashing of the flush water W1 discharged from the drain outlet 687a can be suppressed and backflow of the flush water W2 can be more reliably prevented.

[0084] In addition, by forming an offset structure between the downward sloping surface of the first change section 751a and the downward sloping surface of the second change section 751b, splashing of the cleaning water W1 discharged from the drain outlet 687a can be suppressed and backflow of the cleaning water W2 can be more reliably prevented.

[0085] <Drainage pipe> Next, the drain pipe 760 will be further described with reference to Figures 7 to 9. Figure 7 is a perspective view showing the drain pipe 760. Figures 8 and 9 are diagrams showing the flow of flush water W1 in the drain pipe 760. Note that Figure 8 shows an example of the flow when the flush water W1 is at a small flow rate, and Figure 9 shows an example of the flow when the flush water W1 is at a large flow rate.

[0086] As shown in Figure 9, the drain pipe 760 has a rib 770 provided on an inner circumferential surface 762 of the drain pipe 760. The rib 770 is formed in a rectangular plate shape and is arranged along the vertical direction on the inner circumferential surface 762 of the drain pipe 760. When viewed from above, the rib 770 extends from the inner circumferential surface 762 of the drain pipe 760 to near the center of the drain pipe 760. The rib 770 is provided on a center line that divides the drain pipe 760 in half.

[0087] As shown in Figure 8, when the cleaning water W1 discharged from the drain outlet 687a is at a small flow rate (for example, less than 0.2 L / min), the cleaning water W1 flows downward along the base end 771 of the rib 770 and the tip end 772 of the rib 770, and flows downward from the downwardly convex lower end 773 of the tip end 772 of the rib 770.

[0088] In this case, the outer peripheral surface 763 near the outlet 761 of the drainage pipe 760 is curved convexly from the outside to the inside, so that the so-called Coanda effect, in which the cleaning water W1 is attracted to the nearby inner peripheral surface 762 as shown by the dashed arrow in Figure 8, is suppressed, and the cleaning water W1 discharged from the drainage pipe 760 can be prevented from spreading.

[0089] As shown in Figure 9, when the cleaning water W1 discharged from the drain outlet 687a is at a high flow rate (for example, 0.2 L / min or more), the cleaning water W1 flows downward along the entire surface up to the tip 772 of the rib 770, and then flows downward along the lower end 773 of the rib 770.

[0090] It is preferable that outlet 761 of drain pipe 760 has a smaller diameter than drain port 687a. In this way, the smaller diameter of outlet 761 and rib 770 can further regulate the flow of cleaning water W1.

[0091] With this type of drain pipe 760, the flow of flush water W1 discharged from drain pipe 760 can be regulated by ribs 770 on the inner circumferential surface 762 of drain pipe 760. This makes it possible to stabilize the drainage from drain pipe 760, for example by preventing flush water W1 discharged from drain pipe 760 from spreading.

[0092] In the embodiment described above, the lower end 773 of the rib 770 is configured to have a downwardly convex shape, but the lower end 773 of the rib 770 may also be configured to be flat. With such a configuration, the flow of flush water W1 discharged from the drain pipe 760 can also be regulated.

[0093] Furthermore, in the above-described embodiment, the flow of cleaning water W1 discharged from drainage pipe 760 is regulated by providing ribs 770 on drainage pipe 760, but for example, a configuration may be adopted in which ribs 770 are not provided on drainage pipe 760 and outlet 761 of drainage pipe 760 is inclined like the tip of a syringe needle. With such a configuration, the flow of cleaning water W1 discharged from drainage pipe 760 can also be regulated.

[0094] Further advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. [Explanation of symbols]

[0095] 1 Cleaning water supply device 200 Toilet body 680 Vacuum Breaker 683 Valve body 683a First valve body 683b Second valve body 685 Water flow section 686 Water receiving part 687a Drain 690a First atmospheric inlet (opening to the atmosphere) 690b Second atmospheric inlet (opening to the atmosphere) 691a 1st waterway (waterway) 691b 2nd waterway (waterway) 692a First Water Inlet (Water Inlet) 692b 2nd water inlet (water inlet) 693a 1st water outlet (water outlet) 693b 2nd water outlet (water outlet) 750 Washing water guide means 751 Change Method 751a First Change 751b Second Change 760 Drain line 762 Inner surface 770 Ribs 800 Tank (Drainage Tank) 801 entrance 802 Introduction drainage pipe line O1 drainage center O2 drainage center S1 Open space S2 Open space W1 Cleaning water W2 cleaning water

Claims

1. a tank for storing flush water to be supplied to the toilet body; a water passage having a water inlet on the upstream side and a water outlet on the downstream side, an air inlet that connects the water passage with the outside, a valve body that is provided inside the water passage and operates by the water pressure of the flushing water to connect the water inlet with the water outlet when water is passing through and to connect the water passage with the air inlet when water is not passing through, and a vacuum breaker that has a water receiving portion that receives flushing water that overflows from the air inlet; a drain outlet located above the overflow surface of the tank and for discharging the flush water received in the water receiving portion; an inlet for introducing flush water into a drainage tank that stores flush water discharged from the drainage outlet; Equipped with The washing machine further comprises a flush water guide means provided between the drain outlet and the inlet for guiding flush water discharged from the drain outlet to the inlet, A flush water supply device in which flush water discharged from the drain outlet is discharged to the flush water guiding means through a first space open to the atmosphere and having a first opening different from the drain outlet, and flush water discharged to the flush water guiding means is discharged to the inlet through a second space open to the atmosphere, located below the first space and having a second opening different from the drain outlet and the first opening.

2. 2. The flush water supply device according to claim 1, wherein said flush water guide means has a change means for receiving flush water discharged from said drain outlet and for changing the drain center of said received flush water to said inlet.

3. 3. The flush water supply device according to claim 2, wherein the change means has a downwardly inclined surface along which flush water discharged from the drain outlet flows.

4. A cleaning water supply device as described in any one of claims 1 to 3, wherein the cleaning water guide means has an outlet portion that is positioned at a position offset from the inner circumferential surface of the inlet in a planar view, and by discharging cleaning water from the outlet portion, the cleaning water is discharged from a position offset from the inner circumferential surface of the inlet in a planar view.

5. a drainage pipe extending downward from the drain outlet; 5. The flush water supply device according to claim 1, wherein the drainage pipe overlaps with the flush water guide means.

6. The flush water guide means has a change means for receiving flush water discharged from the drain outlet and changing the drain center of the received flush water to the inlet, The change means has a first change portion that becomes a downwardly inclined surface along which flush water discharged from the drain outlet flows, A cleaning water supply device as described in any one of claims 1 to 5, wherein the change means extends above the inlet drainage pipe to the inlet, and further has a second change section in the inlet drainage pipe that forms a downwardly sloping surface through which cleaning water flows from the first change section.

7. a drainage pipe extending downward from the drain outlet; 7. The flush water supply device according to claim 1, wherein the drainage pipe has a rib extending in the vertical direction on the inner peripheral surface of the drainage pipe.

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