Vacuum Breaker

Abstract

To suppress occurrence of water leakage.SOLUTION: A vacuum breaker comprises: a body part including a first atmosphere introduction port communicating with a first water passage connecting a first water inlet port and a first water outlet port and a second atmosphere introduction port communicating with a second water passage connecting a second water inlet port and a second water outlet port; and a valve body for opening / closing the first atmosphere introduction port and the second atmosphere introduction port. The valve body closes the first atmosphere introduction port when the first water passage is a water passing state and opens the first atmosphere introduction port when the first water passage is a non-water passing state; and closes the second atmosphere introduction port when the second water passage is a water passing state and opens the second atmosphere introduction port when the second water passage is a non-water passing state. The body part comprises: a water reception part for receiving washing water overflowing from the first atmosphere introduction port and the second atmosphere introduction port; a discharge part for discharging washing water overflowing at the water reception part; and a guide part for guiding washing water overflowing from the first atmosphere introduction port to the second atmosphere introduction port.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The disclosed embodiments relate to a vacuum breaker. [Background technology]

[0002] Conventionally, a vacuum breaker having a water receiving section that receives cleaning water overflowing from an air inlet has been known (see, for example, Patent Document 1). The cleaning water overflowing into the water receiving section is discharged from the water receiving section through a drainage port into a water storage tank. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-190489 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when flush water overflowing into the water receiving portion is discharged from the discharge port, there is a risk that the flush water will overflow from the water receiving portion and leak.

[0005] One aspect of the embodiment aims to suppress the occurrence of water leakage. [Means for solving the problem]

[0006] A vacuum breaker according to one aspect of the embodiment includes a main body having a first atmosphere inlet communicating with a first water passage connecting a first water inlet and a first water outlet, and a second atmosphere inlet communicating with a second water passage connecting a second water inlet and a second water outlet, and a valve body for opening and closing the first atmosphere inlet and the second atmosphere inlet. The valve body closes the first atmosphere inlet when the first water passage is in a water-passing state, opens the first atmosphere inlet when the first water passage is in a water-blocking state, closes the second atmosphere inlet when the second water passage is in a water-passing state, and opens the second atmosphere inlet when the second water passage is in a water-blocking state. The main body includes a water receiving section for receiving cleaning water overflowing from the first atmosphere inlet and the second atmosphere inlet, a discharge section for discharging cleaning water overflowing from the water receiving section, and a guide section for guiding cleaning water overflowing from the first atmosphere inlet to the second atmosphere inlet.

[0007] This allows the vacuum breaker to discharge cleaning water overflowing from the first atmospheric inlet through the second atmospheric inlet, thus preventing cleaning water overflowing into the water receiving section from overflowing from the water receiving section, and thus preventing water leakage.

[0008] The valve body includes a first valve body that opens and closes the first atmosphere inlet port, and a second valve body that opens and closes the second atmosphere inlet port.

[0009] This allows the vacuum breaker to open and close the first atmosphere inlet and the second atmosphere inlet by means of each valve body.

[0010] The guide portion is a wall portion protruding from a bottom surface of the water receiving portion, The wall portion is provided so as to surround the first atmosphere inlet, and has an opening portion formed on the second atmosphere inlet side.

[0011] Thereby, the vacuum breaker can prevent the cleaning water overflowing from the first atmosphere inlet from flowing into the discharge section, and can guide the cleaning water overflowing from the first atmosphere inlet to the second atmosphere inlet.

[0012] The height of the wall portion is lower than the height of the outer peripheral wall portion of the water receiving portion.

[0013] As a result, when the flow rate per unit time of cleaning water overflowing from the first atmosphere inlet is high, the vacuum breaker can cause a portion of the cleaning water overflowing from the first atmosphere inlet to flow over the wall toward the discharge section and be discharged from the discharge section. Also, when cleaning water overflows from the first atmosphere inlet and the second atmosphere inlet, the vacuum breaker can discharge it from the discharge section's discharge section. Also, the vacuum breaker can, for example, prevent a cover attached to the top of the main body from being pushed up by cleaning water overflowing from the first atmosphere inlet, thereby preventing water leakage from the vacuum breaker.

[0014] The height of the bottom surface of the main body where the second atmosphere inlet is formed is lower than the height of the bottom surface of the main body where the first atmosphere inlet is formed.

[0015] Thereby, the vacuum breaker can prevent the cleaning water overflowing from the second atmosphere inlet from flowing toward the first atmosphere inlet.

[0016] The discharge section discharges flush water overflowing into the water receiving section into a flow path on the first water outlet side.

[0017] This allows the vacuum breaker to collect cleaning water that overflows into the water receiving section in the tank.

[0018] The discharge section discharges flush water overflowing into the water receiving section into a tank that stores flush water flowing out from the first water outlet.

[0019] This allows the vacuum breaker to collect cleaning water that overflows into the water receiving section in the tank.

[0020] The second water passage is connected to a rim-side water supply passage.

[0021] This allows the vacuum breaker to discharge the flushing water from the rim outlet into the bowl section when flushing water overflows from the first atmosphere inlet. Therefore, the vacuum breaker can prevent insufficient overflow in the tank and prevent the occurrence of leaks. Effect of the Invention

[0022] According to one aspect of the embodiment, the occurrence of water leakage can be suppressed. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is an overall configuration diagram showing a flush toilet equipped with a flush water supply device according to an embodiment. [Diagram 2] FIG. 2 is a perspective view of the periphery of a vacuum breaker in the cleaning water supplying device. [Diagram 3] FIG. 3 is a plan view of the periphery of a vacuum breaker in the cleaning water supplying device. [Figure 4] FIG. 4 is a schematic view of a cross section taken along line IV-IV of FIG. [Diagram 5] FIG. 5 is a diagram for explaining the flow of cleaning water overflowing from the first air inlet. [Figure 6] FIG. 6 is a diagram for explaining the flow of cleaning water overflowing from the second air inlet. [Figure 7] FIG. 7 is a diagram for explaining the flow of cleaning water when the flow rate of cleaning water overflowing from the first air inlet is high. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, with reference to the attached drawings, an embodiment of the vacuum breaker 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 of the elements, the ratios of the elements, and the like may differ from the reality. The drawings may also include parts in which the dimensional relationships and ratios of the elements differ from one another.

[0025] <Configuration of a flush toilet equipped with a flush water supply device> First, the configuration of a flush toilet 100 equipped with a flush water supplying device 1 will be explained with reference to Figure 1. Figure 1 is an overall configuration diagram showing a flush toilet 100 equipped with a flush water supplying device 1 according to an embodiment.

[0026] As shown in FIG. 1, a flush toilet 100 comprises a toilet body 200 that is placed, for example, 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. A rim water spout 212 that spouts rim water, and a jet water spout 214 that spouts jet water are formed in the bowl portion 210. The rim water 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.

[0028] The jet water outlet 214 is formed in the bottom of the bowl portion 210 and discharges flush water toward the drain trap pipe 220. Discharge of flush water from the jet water outlet 214 rapidly 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 a sewer pipe (not shown).

[0029] The cleaning water supplying 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 that 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 for supplying flush water to the rim spout 212 and a tank-side water supply passage 330 for supplying 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 provided downstream of the constant flow valve 620, a switching valve 660 provided downstream of the water supply valve 640, and a vacuum breaker 680 provided downstream of the switching valve 660.

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

[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 the rim-side water supply passage 320 or the tank-side water supply passage 330.

[0034] Vacuum breaker 680 prevents backflow of cleaning water. The specific configuration of vacuum breaker 680 will be described later. Note that in vacuum breaker 680, cleaning water may overflow into water receiving section 686 due to malfunction of valve body 683, but the cleaning water overflowing into water receiving section 686 is collected by water receiving section 686 and then discharged, for example, via discharge section 687 into tank 800. Discharge of cleaning water overflowing into water receiving section 686 will be described later.

[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 lower part of the tank 800, and a 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 to the toilet body 200 when, for example, flush water equal to or above the specified water level WL is supplied into 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 to the jet water outlet 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 outlet 214 by the jet side water supply passage 350 , and pressurizes the wash water stored in the tank 800 and supplies it to the jet water outlet 214 via the jet side water supply passage 350 .

[0038] <Vacuum breaker configuration> Next, a specific configuration of 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 vacuum breaker 680 and its periphery in the cleaning water supplying apparatus 1. Figure 3 is a plan view of the vacuum breaker 680 and its periphery in the cleaning water supplying apparatus 1. Figure 4 is a schematic view of the IV-IV cross section of Figure 3. Figure 3 shows the vacuum breaker 680 with the cover 682 removed.

[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 discharge portion 687, and a guide portion 688. Main body 681 is formed with a first atmosphere inlet 690a and a second atmosphere inlet 690b.

[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 of the outlets of the switching valve 660 and the tank side water supply passage 330. Specifically, the first water passage 691a connects a first water inlet 692a, into which flush water flows in from one of the outlets of the switching valve 660, and a first water outlet 693a, through which flush water flows out to 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 second water inlet 692b, into which flush water flows in from the other outlet of the switching valve 660, and a second water outlet 693b, through which flush water flows out to 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. First protrusion 696a of water receiving portion 686 is inserted into first hole 695a. Second protrusion 696b of water receiving portion 686 is inserted into second hole 695b.

[0043] Water receiving portion 686 is provided above water passing 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 protruding portion 696a and a second protruding portion 696b. The first protruding portion 696a protrudes downward from the lower surface of the water receiving portion 686. A first atmosphere inlet 690a is formed in the first protruding portion 696a. The first atmosphere inlet 690a is formed to penetrate the first protruding portion 696a in the vertical direction. That is, the first atmosphere inlet 690a is formed to penetrate the bottom portion 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 protruding portion 696b protrudes downward from the lower surface of the water receiving portion 686. A second atmosphere inlet 690b is formed in the second protruding portion 696b. The second atmosphere inlet 690b is formed so as to penetrate the second protruding portion 696b in the vertical direction. In other words, the second atmosphere inlet 690b is formed so as to penetrate the bottom portion 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 having 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] The first bottom 697a has the highest bottom height among the bottoms 697, and a first atmosphere inlet 690a is formed therein. The bottom of the second bottom 697b is lower than the bottom of the first bottom 697a. The second bottom 697b is formed with a second atmosphere inlet 690b. The bottom of the third bottom 697c is lower than the bottom of the second bottom 697b. The bottom of the fourth bottom 697d is lower than the third bottom 697c. In other words, the bottom heights of the first bottom 697a, the second bottom 697b, the third bottom 697c, and the fourth bottom 697d are lower in this order. The fourth bottom 697d is provided with an exhaust section 687. The bottom of the third bottom 697c may be at the same height as the bottom of the second bottom 697b.

[0048] The water receiving portion 686 receives the washing water overflowing from the first atmosphere inlet 690a and the second atmosphere inlet 690b.

[0049] The guide portion 688 guides the washing water overflowing 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 described as the "wall portion 688". The wall portion 688 is provided on the inside of the outer peripheral wall portion 698. The wall portion 688 guides the washing water overflowing from the first atmosphere inlet 690a to the second atmosphere inlet 690b. The wall portion 688 is provided so as to surround the first atmosphere inlet 690a. The wall portion 688 protrudes upward from the periphery of the first bottom portion 697a.

[0050] 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 provided closer to the exhaust portion 687 than the first wall portion 688a, or closer to the second atmosphere inlet port 690b than the first wall portion 688a.

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

[0052] 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 protruding upward from the first bottom portion 697a, the second bottom portion 697b, and the third bottom portion 697c.

[0053] The discharge portion 687 discharges the cleaning water that overflows into the water receiving portion 686. The discharge portion 687 discharges the cleaning water that overflows into the water receiving portion 686 to the tank 800. Specifically, the discharge portion 687 discharges the cleaning water that overflows into the water receiving portion 686 to the tank joint 702. The tank joint 702 is provided above the tank 800 and allows the cleaning water discharged from the water receiving portion 686 to flow into the tank 800.

[0054] The discharge portion 687 protrudes downward from the fourth bottom portion 697d of the water receiving portion 686. A discharge port 687a is formed in the discharge portion 687. The discharge port 687a is formed along the vertical direction. The discharge port 687a is formed so as to penetrate the fourth bottom portion 697d of the water receiving portion 686.

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

[0056] 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 the first valve body 683a is in a water-passing state, 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 introduction port 690a and closes the first atmosphere introduction port 690a. When the first water passage 691a is in a water-passing state, the first valve body 683a closes the first atmosphere introduction port 690a and does not communicate between the first water passage 691a and the outside.

[0057] When the first water passage 691a is in a non-water-passing state, the first valve body 683a descends by its own weight, moves away from the lower end of the first protruding portion 696a, opens the lower end of the first air inlet 690a, and opens the first air inlet 690a. When the first water passage 691a is in a non-water-passing state, the first valve body 683a opens the first air inlet 690a, connects the first water passage 691a to the outside, and introduces outside air into the first water passage 691a. This prevents the first water passage 691a from becoming negative pressure, and prevents backflow of flush water in the first water passage 691a, i.e., the tank-side water supply passage 330.

[0058] 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 the second valve body 683b is in a water-passing state, 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] When the second water passage 691b is in a non-water-passing state, the second valve body 683b descends by its own weight, moves away from the lower end of the second protrusion 696b, opens the lower end of the second air inlet 690b, and opens the second air inlet 690b. When the second water passage 691b is in a non-water-passing state, the second valve body 683b opens the second air inlet 690b, connects the second water passage 691b to the outside, and introduces outside air into the second water passage 691b. This prevents negative pressure in 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.

[0060] <Draining the washing water overflowing from the water receiving section> In vacuum breaker 680, first valve body 683a and second valve body 683b move up and down depending on the state of cleaning water in first water passage 691a and second water passage 691b. When cleaning water is flowing in each water passage, first atmosphere introduction port 690a and second atmosphere introduction port 690b are closed by first valve body 683a and second valve body 683b, respectively.

[0061] However, when the first water passage 691a (tank side water supply passage 330) is in a water flowing state, for example, dust may get caught 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, and the first valve body 683a may not be able to close the first atmosphere introduction port 690a.

[0062] In such a case, the wash water flows from the first water passage 691a to the first atmosphere inlet 690a, and overflows into the water receiving portion 686 from the first atmosphere inlet 690a.

[0063] As shown in Fig. 5, the wash water overflowing from first atmosphere inlet 690a into water receiving section 686 is guided toward second atmosphere inlet 690b by wall section 688. Fig. 5 is a diagram illustrating the flow of wash water overflowing from first atmosphere inlet 690a.

[0064] When the second water passage 691b is in a non-water-passing state, the second atmosphere inlet 690b is open, and therefore flush water that flows into the second atmosphere inlet 690b flows from the second atmosphere inlet 690b through the second water passage 691b into the rim-side water supply passage 320. The flush water that flows into the second atmosphere inlet 690b is then discharged from the rim water outlet 212 into the bowl portion 210.

[0065] For example, if flush water overflowing into the water receiving portion 686 is drained into the tank 800 while water is being supplied to the tank 800, there is a risk of an insufficient overflow in the tank 800, which could result in a leak. The vacuum breaker 680 discharges flush water overflowing from the first atmosphere inlet 690a, which communicates with the first water passage 691a (tank side water supply passage 330), from the second atmosphere inlet 690b through the rim water outlet 212 into the bowl portion 210.

[0066] As a result, when flush water overflows from the first atmosphere inlet 690a, the vacuum breaker 680 discharges the overflowing flush water from the rim water outlet 212 into the bowl portion 210, preventing insufficient overflow in the tank 800 and preventing the occurrence of leaks.

[0067] Furthermore, when second water passage 691b is in a water-passing state, for example, dust may become caught between second valve body 683b and the lower end of second protrusion 696b. In such a case, second valve body 683b may malfunction, and second valve body 683b may not be able to close second atmosphere introduction port 690b.

[0068] The cleaning water overflowing from second atmosphere inlet 690b into water receiving section 686 flows along second bottom 697b, third bottom 697c, and fourth bottom 697d toward outlet 687a of outlet section 687, as shown in Fig. 6. Then, the cleaning water overflowing from second atmosphere inlet 690b into water receiving section 686 is discharged from outlet 687a of outlet section 687 via tank joint 702 into tank 800, and is stored in tank 800. Fig. 6 is a diagram for explaining the flow of cleaning water overflowing from second atmosphere inlet 690b.

[0069] When the flow rate of flush water overflowing from first atmosphere inlet 690a into water receiving section 686 per unit time is high, some of the flush water flows toward second atmosphere inlet 690b, as shown in Fig. 7. A portion of the flush water that has flowed to the periphery of second atmosphere inlet 690b flows from second atmosphere inlet 690b into second water passage 691b and is discharged from rim spout 212 into bowl section 210. Fig. 7 is a diagram explaining the flow of flush water when the flow rate of flush water overflowing from first atmosphere inlet 690a is high.

[0070] When the flow rate of the cleaning water overflowing from the first atmosphere inlet 690a to the water receiving portion 686 per unit time is large, a part of the cleaning water that has flowed to the periphery of the second atmosphere inlet 690b cannot flow into the second atmosphere inlet 690b. The cleaning water that does not flow into the second atmosphere inlet 690b is discharged from the outlet 687a of the discharge portion 687 along the second bottom 697b, the third bottom 697c, and the fourth bottom 697d to the tank 800 via the tank joint 702. Furthermore, a part of the cleaning water overflowing from the first atmosphere inlet 690a flows over the second wall portion 688b toward the fourth bottom 697d, and is discharged from the outlet 687a of the discharge portion 687 to the tank 800 via the tank joint 702.

[0071] When the cleaning water overflows from the first atmosphere inlet 690a and the second atmosphere inlet 690b, the cleaning water overflowing from the first atmosphere inlet 690a flows toward the second atmosphere inlet 690b. The cleaning water overflowing from the first atmosphere inlet 690a is discharged from the outlet 687a of the discharge section 687 to the tank 800 via the tank joint 702 together with the cleaning water overflowing from the second atmosphere inlet 690b. When the flow rate of the cleaning water overflowing from the first atmosphere inlet 690a to the water receiving section 686 per unit time is large, a part of the cleaning water overflowing from the first atmosphere inlet 690a goes over the second wall section 688b and flows toward the fourth bottom section 697d. A part of the cleaning water overflowing from the first atmosphere inlet 690a is discharged from the outlet 687a of the discharge section 687 to the tank 800 via the tank joint 702.

[0072] The supply destination of flush water from the water supply source is switched by the switching valve 660 to the rim side water supply passage 320 or the tank side water supply passage 330, but immediately after switching by the switching valve 660, the rim side water supply passage 320 and the tank side water supply passage 330 may be in a water-passing state. In such a case, flush water may overflow from the first atmosphere inlet 690a and the second atmosphere inlet 690b as described above. Even in such a case, the vacuum breaker 680 can discharge flush water overflowing from the first atmosphere inlet 690a and the second atmosphere inlet 690b from the outlet 687a via the tank joint 702 to the tank 800.

[0073] <Effects> The vacuum breaker 680 includes a main body 681 and a valve body 683. The main body 681 has a first atmosphere inlet 690a and a second atmosphere inlet 690b. The first atmosphere inlet 690a communicates with a first water passage 691a that connects a first water inlet 692a and a first water outlet 693a. The second atmosphere inlet 690b communicates with a second water passage 691b that connects a second water inlet 692b and a second water outlet 693b. The valve body 683 opens and closes the first atmosphere inlet 690a and the second atmosphere inlet 690b. The valve body 683 closes the first atmosphere inlet 690a when the first water passage 691a is in a water-passing state, and opens the first atmosphere inlet 690a when the first water passage 691a is in a water-non-passing state. The valve body 683 closes the second atmosphere inlet 690b when the second water passage 691b is in a water-passing state, and opens the second atmosphere inlet 690b when the second water passage 691b is in a water-non-passing state. The main body 681 includes a water receiving portion 686, a discharge portion 687, and a guide portion 688. The water receiving portion 686 receives wash water overflowing from the first atmosphere inlet 690a and the second atmosphere inlet 690b. The discharge portion 687 discharges wash water overflowing into the water receiving portion 686. The guide portion 688 guides wash water overflowing from the first atmosphere inlet 690a to the second atmosphere inlet 690b.

[0074] This allows the vacuum breaker 680 to discharge the cleaning water overflowing from the first atmosphere inlet 690a through the second atmosphere inlet 690b. Therefore, the vacuum breaker 680 can prevent the cleaning water overflowing into the water receiving section 686 from overflowing from the water receiving section 686, and can prevent the occurrence of water leakage.

[0075] The valve body 683 includes a first valve body 683a and a second valve body 683b. The first valve body 683a opens and closes a first atmosphere introduction port 690a. The second valve body 683b opens and closes a second atmosphere introduction port 690b.

[0076] Thus, the vacuum breaker 680 can open and close the first atmosphere introduction port 690a and the second atmosphere introduction port 690b by using the valve bodies 683, respectively.

[0077] The guide portion 688 is a wall portion 688 protruding from the bottom surface of the water receiving portion 686. The wall portion 688 is provided so as to surround the first atmosphere inlet 690a, and has an opening portion 688c formed on the second atmosphere inlet 690b side.

[0078] As a result, the vacuum breaker 680 can prevent the cleaning water overflowing from the first atmosphere inlet 690a from flowing into the discharge section 687, and can guide the cleaning water overflowing from the first atmosphere inlet 690a to the second atmosphere inlet 690b.

[0079] The height of the wall portion 688 is lower than the height of an outer peripheral wall portion 698 of the water receiving portion 686 .

[0080] As a result, when the flow rate per unit time of the cleaning water overflowing from the first atmosphere inlet 690a is high, the vacuum breaker 680 can make a part of the cleaning water overflowing from the first atmosphere inlet 690a flow over the wall portion 688 toward the discharge portion 687 and discharge it from the discharge port 687a of the discharge portion 687. Also, when the cleaning water overflows from the first atmosphere inlet 690a and the second atmosphere inlet 690b, the vacuum breaker 680 can discharge it from the discharge port 687a of the discharge portion 687. Also, the vacuum breaker 680 can suppress the cover 682 from being pushed up by the cleaning water overflowing from the first atmosphere inlet 690a, for example, and suppress the occurrence of water leakage from the vacuum breaker 680.

[0081] The height of the bottom surface of the main body 681 where the second atmosphere inlet port 690b is formed is lower than the height of the bottom surface of the main body 681 where the first atmosphere inlet port 690a is formed.

[0082] This allows the vacuum breaker 680 to prevent the cleaning water overflowing from the second atmosphere inlet 690b from flowing toward the first atmosphere inlet 690a.

[0083] The second water passage 691b is connected to the rim side water supply passage 320.

[0084] As a result, when flush water overflows from the first atmosphere inlet 690a, the vacuum breaker 680 can discharge the overflowing flush water from the rim water outlet 212 into the bowl portion 210. Therefore, the vacuum breaker 680 can suppress insufficient overflow in the tank 800, and suppress the occurrence of leaks.

[0085] <Modification> In a modified example, the vacuum breaker 680 may have a first bottom 697a of the water receiving portion 686 inclined as a guide portion 688 for guiding the cleaning water overflowing from the first atmosphere inlet 690a to the second atmosphere inlet 690b. In this case, the first bottom 697a of the water receiving portion 686 is inclined so that the height decreases toward the second atmosphere inlet 690b. The guide portion 688 may also be a groove formed in the first bottom 697a. The groove is formed so as to flow the cleaning water overflowing from the first atmosphere inlet 690a toward the second atmosphere inlet 690b. The guide portion 688 may be a combination of two or more of the wall portion 688, the inclination of the first bottom 697a, and the groove formed in the first bottom 697a.

[0086] In the vacuum breaker 680 according to the modified example, the first bottom 697a of the water receiving portion 686 and the second bottom 697b of the water receiving portion 686 may be at the same height. This allows the vacuum breaker 680 to flow a part of the cleaning water overflowing from the second atmosphere inlet 690b to the tank side water supply passage 330 via the first atmosphere inlet 690a. Therefore, for example, when the flow rate per unit time of the cleaning water overflowing from the second atmosphere inlet 690b is high, a part of the cleaning water overflowing from the second atmosphere inlet 690b can be discharged from the first atmosphere inlet 690a. Therefore, when the flow rate per unit time of the cleaning water overflowing from the second atmosphere inlet 690b is high, the vacuum breaker 680 can increase the amount of water discharged from the water receiving portion 686, and for example, can suppress the overflow of the cleaning water from between the main body portion 681 and the cover 682.

[0087] Vacuum breaker 680 according to the modified example may discharge flush water that overflows into water receiving section 686 into a flow path on the first water outlet 693a side, for example, into tank side water supply path 330. This allows vacuum breaker 680 to collect flush water that overflows into water receiving section 686 in tank 800.

[0088] Further advantages and modifications may readily occur to those skilled in the art. Thus, 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 equivalents thereof. [Explanation of symbols]

[0089] 1 Cleaning water supply device 210 Bowl section 320 Rim side water supply channel 330 Tank side water supply channel 600 Valve Unit 660 Switching valve 680 Vacuum Breaker 681 Main body 682 Cover 683 Valve body 683a First valve body 683b Second valve body 685 Water flow section 686 Water receiving part 687 Discharge section 687a Outlet 688 Guidance section (wall) 690a First Atmospheric Inlet 690b Second Atmospheric Inlet 691a First Waterway 691b Second Waterway 692a First Entrance 692b 2nd water inlet 693a 1st water outlet 693b 2nd outlet 697 Bottom 697a 1st bottom 697b 2nd bottom 697c 3rd bottom 697d 4th bottom 698 Outer wall 702 Tank joint 800 Tank

Claims

1. a main body having a first atmosphere inlet communicating with a first water passage connecting the first water inlet and the first water outlet, and a second atmosphere inlet communicating with a second water passage connecting the second water inlet and the second water outlet; a valve body that opens and closes the first atmosphere inlet and the second atmosphere inlet; Equipped with The valve body is closing the first atmosphere inlet when the first water passage is in a water-passing state, and opening the first atmosphere inlet when the first water passage is in a water-non-passing state; closing the second atmosphere inlet when the second water passage is in a water-passing state, and opening the second atmosphere inlet when the second water passage is in a water-non-passing state; The main body portion is a water receiving portion for receiving cleaning water overflowing from the first atmosphere inlet and the second atmosphere inlet; A drainage section for draining washing water overflowing from the water receiving section; a guide portion that guides the cleaning water overflowing from the first air inlet to the second air inlet; Equipped with The guide portion is a wall portion protruding from a bottom surface of the water receiving portion, The wall portion is provided so as to surround the first atmosphere inlet, and an opening is formed on the second atmosphere inlet side.

2. The valve body is a first valve body that opens and closes the first atmosphere introduction port; 2. The vacuum breaker according to claim 1, further comprising a second valve body that opens and closes said second atmosphere inlet.

3. 3. The vacuum breaker according to claim 1, wherein the wall portion has a height lower than a height of an outer peripheral wall portion of the water receiving portion.

4. 4. A vacuum breaker according to claim 1, wherein the height of the bottom surface of the main body portion in which the second atmospheric inlet is formed is lower than the height of the bottom surface of the main body portion in which the first atmospheric inlet is formed.

5. The vacuum breaker according to any one of claims 1 to 4, wherein the discharge section discharges flush water overflowing into the water receiving section into a flow path on the first water outlet side.

6. 6. The vacuum breaker according to claim 1, wherein the discharge section discharges flush water overflowing into the water receiving section into a tank that stores flush water flowing out from the first water outlet.

7. The vacuum breaker according to any one of claims 1 to 6, wherein the second water passage is connected to a rim-side water supply passage.

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