JP7782169B2 - Cleaning water supply device - Google Patents

Description

The disclosed embodiment relates to a cleaning water supply device.

Some flush water supply devices that supply flush water for flushing toilets are equipped with a vacuum breaker, which has a water receiver that catches flush water that overflows from the air inlet to prevent water leakage outside the machine even if the air inlet cannot be blocked, and the flush water is discharged from the water receiver into a drain tank.

In a conventional flush water supply device, a hose is used to connect the flow path from the water receiving section to the drainage tank, allowing for both drainage from the water receiving section to the drainage tank and intake and exhaust (see, for example, Patent Documents 1 and 2).

JP 2014-190489 A Japanese Patent Application Laid-Open No. 2018-109335

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

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. Furthermore, if a large amount of flush water is discharged from the water receiving section, it may not be discharged from the drain outlet, causing flush water to stagnate.

One aspect of this embodiment aims to provide a flush water supply device that can prevent backflow and stagnation of flush water.

A flush water supply device according to one embodiment comprises 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 to the outside; a valve body provided inside the water passage that operates by the water pressure of the flush water to connect the water inlet and the water outlet when water is flowing and to connect the water passage to the air inlet when water is not flowing; and a vacuum breaker having a water receiver that receives flush water that overflows from the air inlet. The washing machine is equipped with a drain outlet for discharging flush water received in the water receiving section, and an inlet for introducing flush water into the interior of a drain tank that stores flush water discharged from the drain outlet, and further equipped with a flush water guiding means that is provided between the drain outlet and the inlet and guides flush water discharged from the drain outlet to the inlet, and discharges flush water discharged from the drain outlet to the flush water guiding means via a space open to the atmosphere, and discharges flush water discharged to the flush water guiding means to the inlet via a space open to the atmosphere.

With this configuration, flush water is discharged from the drain outlet to the flush water guide means by spatial discharge, and from the flush water guide means to the inlet by spatial discharge. This prevents flush water from flowing back even if, for example, the drain tank becomes full and flush water overflows from the inlet. It also prevents flush water from stagnating even if, for example, a large amount of flush water is discharged from the drain outlet.

In the above-mentioned flush water supply device, the flush water guide means has a change means for receiving flush water discharged from the drain outlet and changing the drainage center of the received flush water to the inlet.

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

In the above-mentioned flush water supply device, the changing means has a downwardly sloping surface along which flush water discharged from the drain outlet flows.

With this configuration, the flush water flows along the downward slope, allowing the center of drainage to the flush water inlet to be changed. This reduces splashing of flush water discharged from the drain outlet and more reliably prevents backflow of flush water.

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

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.

The flush water supply device is provided with a drainage pipe extending downward from the drain outlet, and the drainage pipe overlaps with the flush water guide means.

With this configuration, the drain pipe extending downward from the drain outlet overlaps with the flush water guide means, which reduces splashing of flush water discharged from the drain outlet and more reliably prevents backflow of flush water.

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

With this configuration, the change means has an offset structure with a first change section (downward sloping surface) and a second change section (downward sloping surface), which can reduce splashing of flush water discharged from the drain outlet and more reliably prevent backflow of flush water.

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

With this configuration, the ribs provided on the inner surface of the drainage pipe can regulate the flow of flush water discharged from the drainage pipe. This can stabilize the drainage from the drainage pipe, such as by preventing the flush water from spreading.

According to one aspect of the embodiment, backflow and stagnation of cleaning water can be prevented.

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

Embodiments of the flush water supply device disclosed in this application will be described in detail below with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments shown below. It should also 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.

<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.

As shown in Figure 1, the 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.

The toilet body 200 comprises a bowl portion 210 for receiving waste, and a drain trap pipe 220 extending rearward from the bottom of the bowl portion 210. The bowl portion 210 is formed with a rim spout 212 for rim spouting and a jet spout 214 for jet spouting. The rim spout 212 is formed at the rear of the upper part of the bowl portion 210, and spouts flushing water along the upper edge of the bowl portion 210.

The jet water outlet 214 is formed at the bottom of the bowl portion 210 and discharges flush water toward the drain trap pipe 220. The discharge of flush water from the jet water outlet 214 quickly fills the drain trap pipe 220 with flush water, allowing the siphoning action to occur early. The drain trap pipe 220 forms a water seal and is connected to the sewer pipe (not shown).

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 and storing cleaning water, and a pressure pump 900 located downstream within the tank 800 and pressurizing the cleaning water.

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. Furthermore, 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.

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.

The constant flow valve 620 maintains a constant flow rate of flush water flowing from the water supply passage 310 into the constant flow valve 620 and downstream. The water supply valve 640 is configured, for example, to include a diaphragm, and by opening and closing it switches between discharging and stopping flush water at the rim spout 212 and jet spout 214.

The switching valve 660 switches the 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 channel 320 or the tank-side water supply channel 330.

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

The tank 800 stores flush water that is supplied to the jet spout 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.

An overflow path 342 is also connected to the top of the tank 800. The overflow path 342 allows flush water to flow into the toilet body 200 when flush water equal to or above the specified water level WL is supplied inside the tank 800. In particular, the overflow path 342 allows flush water that has reached the specified water level WL or above to flow through the jet-side water supply path 350 to the jet spout 214 of the toilet body 200, without passing through the pressure pump 900.

The pressure pump 900 is connected to the jet water outlet 214 via the jet-side water supply passage 350, and pressurizes the cleaning water stored in the tank 800 and supplies it to the jet water outlet 214 via the jet-side water supply passage 350.

<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 flush water supplying apparatus 1. Figure 3 is a plan view of the area around the vacuum breaker 680 in the flush 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.

The vacuum breaker 680 comprises a main body 681, a cover 682, and a valve body 683. The main body 681 comprises a water passage 685, a water receiving portion 686, a drainage portion 687, and a guide portion 688. The main body 681 is formed with two atmospheric air inlets: a first atmospheric air inlet 690a and a second atmospheric air inlet 690b.

The water passage section 685 is formed with a first water passage 691a and a second water passage 691b. The first water passage 691a is a flow path that connects one outlet of the switching valve 660 to 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.

The second water passage 691b is a flow path that connects the other outlet of the switching valve 660 to the rim-side water supply passage 320. Specifically, the second water passage 691b connects a water inlet (second water inlet) 692b, through 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.

The water passage portion 685 is formed with a first hole 695a that communicates with the first water passage 691a and a second hole 695b that communicates with the second water passage 691b. The first hole 695a and the second hole 695b are formed above the water passage portion 685. The first protrusion 696a of the water receiving portion 686 is inserted into the first hole 695a. The second protrusion 696b of the water receiving portion 686 is inserted into the second hole 695b.

The water receiving section 686 is provided above the water passage section 685. The upper end of the water receiving section 686 is open, and a cover 682 is attached to it.

The water receiving portion 686 has a first protrusion 696a and a second protrusion 696b. The first protrusion 696a protrudes downward from the underside of the water receiving portion 686. A first air inlet 690a, which is an air inlet, is formed in the first protrusion 696a. The first air inlet 690a is formed to penetrate the first protrusion 696a in the vertical direction. In other words, the first air inlet 690a is formed to penetrate the bottom 697 of the water receiving portion 686 in the vertical direction. The first air inlet 690a is connected to the first water passage 691a.

The second protrusion 696b protrudes downward from the underside of the water receiving portion 686. A second air inlet 690b, which is an air inlet, is formed in the second protrusion 696b. The second air inlet 690b is formed to penetrate the second protrusion 696b in the vertical direction. In other words, the second air inlet 690b is formed to penetrate the bottom 697 of the water receiving portion 686 in the vertical direction. The second air inlet 690b is connected to the second water passage 691b.

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

The first bottom portion 697a has the highest bottom surface among the bottom portions 697, and is formed with a first atmospheric air inlet 690a. The bottom surface of the second bottom portion 697b is lower than the bottom surface of the first bottom portion 697a. A second atmospheric air inlet 690b is formed in the second bottom portion 697b. The bottom surface of the third bottom portion 697c is lower than the bottom surface of the second bottom portion 697b. The bottom surface of the fourth bottom portion 697d is lower than the third bottom portion 697c. In other words, the bottom surfaces decrease in height in the order of the first bottom portion 697a, the second bottom portion 697b, the third bottom portion 697c, and the fourth bottom portion 697d. A drainage portion 687 is provided in the fourth bottom portion 697d. The bottom surface of the third bottom portion 697c may be at the same height as the bottom surface of the second bottom portion 697b.

The water receiving portion 686 receives the cleaning water that overflows from the first air inlet 690a and the second air inlet 690b. An outer peripheral wall portion 698 is formed around the periphery of the water receiving portion 686.

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

The wall portion 688 includes a first wall portion 688a and a second wall portion 688b. The second wall portion 688b is shorter in height than the first wall portion 688a. The second wall portion 688b is located closer to the drainage portion 687 than the first wall portion 688a or closer to the second air inlet 690b than the first wall portion 688a.

An opening 688c is formed in the wall portion 688. The opening 688c is provided on the second atmosphere inlet 690b side. The opening 688c is formed by discontinuing the wall portion 688 around the second atmosphere inlet 690b, and opens toward the second atmosphere inlet 690b side. For example, the opening 688c is formed by not connecting the end of the first wall portion 688a on the second atmosphere inlet 690b side and the end of the second wall portion 688b on the second atmosphere inlet 690b side.

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

The drain section 687 drains the cleaning water from the water receiving section 686. The drain section 687 drains the cleaning water from the water receiving section 686 into the tank 800. The drain section 687 drains the cleaning water from the water receiving section 686 into the tank 800 via the tank joint 702. The tank joint 702 is located above the tank 800 and allows the cleaning water discharged from the drain outlet 687a to flow into the tank 800.

The drain portion 687 also protrudes downward from the fourth bottom portion 697d of the water receiving portion 686. As described above, the drain portion 687 is formed with a drain outlet 687a. The drain outlet 687a is formed in the vertical direction. The drain outlet 687a is formed to penetrate the fourth bottom portion 697d of the water receiving portion 686.

The valve body 683 switches between a communication state between the first water passage 691a and the outside and a communication state between the second water passage 691b and the outside by opening and closing the first atmosphere inlet 690a and the second atmosphere inlet 690b. The valve body 683 includes a first valve body 683a and a second valve body 683b.

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

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

The second valve body 683b moves up and down due to the water pressure of the 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 blocks the lower end of the second atmosphere inlet port 690b, closing the second atmosphere inlet port 690b. When the second water passage 691b is passing water through, the second valve body 683b closes the second atmosphere inlet port 690b, preventing communication between the second water passage 691b and the outside.

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

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

When water is flowing through the first water passage 691a (tank-side water supply passage 330), debris may become trapped between the first valve body 683a and the lower end of the first protrusion 696a. In such a case, the first valve body 683a may malfunction, preventing the first valve body 683a from closing the first atmosphere inlet 690a. If the first atmosphere inlet 690a cannot be closed, cleaning water will flow from the first water passage 691a to the first atmosphere inlet 690a, causing the cleaning water to overflow from the first atmosphere inlet 690a into the water receiver 686.

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

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. The flush water W1 discharged from the drain outlet 687a is discharged to the flush water guide means 750 via the 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 via the space S2 open to the atmosphere (see Figure 6). This enables quick discharge from the water receiving section 686 to the tank 800 without increasing the wall height of the water receiving section 686, improving drainage capacity.

<Flushing 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.

In order to achieve a more compact size (low silhouette) and 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 some 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). Therefore, the vertical distance D2 between the overflow level L1 and the overflow surface L2 must be limited. 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.

As such, in order to reduce the size of the flush 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 flush water W2 (see Figure 6) from the inlet 801 of the tank 800.

As shown in FIG. 5, a tank joint 702 is disposed between the drain outlet 687a and the inlet 801 of the tank 800. The drain outlet 687a discharges the cleaning water W1 (see FIG. 6) received in the water receiving portion 686. The drain outlet 687a is connected to the interior of the water receiving portion 686.

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

The inlet 801 is an opening for introducing cleaning water W1 into the tank 800, which functions as the drainage tank for storing cleaning water W1 discharged from the drainage port 687a. The inlet 801 is formed in the top of the tank 800.

The cleaning water W1 discharged from the drain outlet 687a is discharged to the inlet 801 via the tank joint 702.

A flush water guide means 750 is provided inside the tank joint 702. That is, the flush water guide means 750 is provided between the drain outlet 687a and the inlet 801. The flush water guide means 750 guides the flush water W1 discharged from the drain outlet 687a to the inlet 801.

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

The first change section 751a has a sloped downward inclined surface. This downward inclined surface is an inclined surface that allows the flush water W1 discharged from the drain outlet 687a to flow downward.

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

The second change section 751b also extends above the inlet/outlet pipe 802 leading to the inlet 801. In other words, the second change section 751b forms a downwardly sloping surface above the inlet/outlet pipe 802.

In this way, the change means 751 has an offset structure with respect to the check valve 803 of the tank 800 due to the first change portion 751a and the second change portion 751b.

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

As shown in FIG. 6, the tank joint 702 discharges the flush water W1 discharged from the drain port 687a to the flush water guiding means 750 (first change section 751a) via the space S1 open to the atmosphere. The flush water guiding means 750 discharges the flush water W1 from the first change section 751a to the second change section 751b. The tank joint 702 also discharges the flush water W1 discharged to the flush water guiding means 750 (second change section 751b) to the inlet 801 via the space S2 open to the atmosphere. Because the discharge passes through the spaces S1 and S2 open to the atmosphere, even if the tank joint 702 is filled with flush water, the level of the flush water W2 that has overflowed from the tank 800 can be prevented from rising due to capillary action.

With this configuration, flush water W1 is discharged from the drain outlet 687a to the flush water guide means 750 by spatial discharge, and flush water W1 is also discharged from the flush water guide means 750 to the inlet 801 by spatial discharge. This prevents flush water W2 from flowing back even if, for example, the tank 800 becomes full and flush water W2 overflows from the inlet 801. Furthermore, even if, for example, a large amount of flush water W1 is discharged from the drain outlet 687a, it is possible to prevent flush water W1 from stagnating.

Furthermore, by changing the drainage center O1 of the cleaning water W1 to the inlet 801 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.

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

In addition, because the wash water guide means 750 discharges the wash water W1 from a position that is not directly above the inlet 801, even if the wash water W2 overflows from the inlet 801, the overflowing wash water W2 can be prevented from directly entering the wash water guide means 750.

In addition, the drain pipe 760 extending downward from the drain outlet 687a overlaps with the flush water guide means 750, which reduces splashing of the flush water W1 discharged from the drain outlet 687a and more reliably prevents backflow of the flush water W2.

In addition, the downward sloping surface of the first change section 751a and the downward sloping surface of the second change section 751b are offset, which can suppress splashing of the cleaning water W1 discharged from the drain outlet 687a and more reliably prevent backflow of the cleaning water W2.

<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.

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

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

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, which suppresses the so-called Coanda effect, in which the cleaning water W1 is drawn to the nearby inner peripheral surface 762, as shown by the dashed arrow in Figure 8, and prevents the cleaning water W1 discharged from the drainage pipe 760 from spreading.

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 of the rib 770 up to the tip 772, and then flows downward along the lower end 773 of the rib 770.

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

With this type of drainage pipe 760, the ribs 770 on the inner surface 762 of the drainage pipe 760 can regulate the flow of cleaning water W1 discharged from the drainage pipe 760. This can stabilize the drainage from the drainage pipe 760, such as by preventing the cleaning water W1 discharged from the drainage pipe 760 from spreading.

In the above embodiment, 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. This configuration also makes it possible to regulate the flow of flush water W1 discharged from the drainage pipe 760.

In addition, in the above-described embodiment, the flow of cleaning water W1 discharged from the drainage pipe 760 is regulated by providing a rib 770 on the drainage pipe 760. However, for example, the drainage pipe 760 may not be provided with a rib 770, and the outlet 761 of the drainage pipe 760 may be configured to be inclined like the tip of a syringe needle. With such a configuration, the flow of cleaning water W1 discharged from the drainage pipe 760 can also be regulated.

Further advantages and modifications may 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.

1 Flush water supply device 200 Toilet body 680 Vacuum breaker 683 Valve body 683a First valve body 683b Second valve body 685 Water passage part 686 Water receiving part 687a Drain port 690a First atmosphere inlet (open-to-atmosphere port)
690b Second atmosphere inlet (opening to the atmosphere)
691a First waterway (waterway)
691b Second 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: flush water guiding means 751: change means 751a: first change portion 751b: second change portion 760: drain pipe 762: inner peripheral surface 770: rib 800: tank (drain tank)
801 Inlet port 802 Inlet drain pipe O1 Drain center O2 Drain center S1 Space open to the atmosphere S2 Space open to the atmosphere W1 Cleaning water W2 Cleaning water

Claims (7)

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