Vacuum Breaker

Abstract

To restrain water leakage from occurring.SOLUTION: A vacuum breaker according to an embodiment comprises a main body part, and a valve element. The main body part has an atmospheric air introduction port communicating with a water conduit connecting a water inlet and a water outlet. The valve element closes the atmospheric air introduction port when the water conduit is in a water passage state, and opens the atmospheric air introduction port when the water conduit is not in the water passage state. The main body part comprises a water receiving part, a cover, a first discharge part, and a second discharge part. The water receiving part receives washing water overflowing from the atmospheric air introduction port. The cover covers an upper side of the water receiving part. In the first discharge part, a discharge port for discharging washing water overflowing into the receiving part, from the water receiving part is formed. The second discharge part discharges washing water leaking from between the water receiving part and the cover.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] Conventionally, there is known a vacuum breaker having a water receiving section that receives cleaning water overflowing from an air inlet (for example, see Patent Document 1). A cover is attached above the water receiving section to prevent the cleaning water overflowing into the water receiving section from splashing out of the water receiving section. [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, with the above-mentioned vacuum breaker, if the overflow exceeds the capacity of the drain outlet, cleaning water may leak out from between the water receiving portion and the cover, resulting in water leakage.

[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 an embodiment includes a main body having an air inlet communicating with a water passage connecting a water inlet and an outlet, and a valve body that closes the air inlet when the water passage is in a water-passing state and opens the air inlet when the water passage is in a water-non-passing state. The main body includes a water receiving portion that receives wash water overflowing from the air inlet, a cover that covers the upper side of the water receiving portion, a first discharge portion in which a discharge port is formed for discharging wash water overflowing into the water receiving portion from the water receiving portion, and a second discharge portion that discharges wash water leaking from between the water receiving portion and the cover.

[0007] As a result, even if the amount of water overflowing from the first discharge section is greater than the amount that can be drained, the vacuum breaker can use the second discharge section to discharge cleaning water leaking from between the water receiving section and the cover. Therefore, the vacuum breaker can suppress the occurrence of water leakage.

[0008] The second discharge portion is formed with a discharge passage that extends along the outer wall of the outer circumferential wall portion of the water receiving portion to the vicinity of the first discharge portion.

[0009] As a result, the vacuum breaker can guide the cleaning water discharged by the second discharge section to the first discharge section, thereby discharging the cleaning water discharged via the first discharge section and the second discharge section all at once. Therefore, the vacuum breaker can prevent the discharge path of the cleaning water overflowing into the water receiving section from becoming complicated.

[0010] The water receiving portion is formed with a notch in which a mounting arm of the cover is disposed. The mounting arm is provided above the discharge passage and straddles the discharge passage.

[0011] This allows the vacuum breaker to use the second drain to drain cleaning water leaking from between the notch and the mounting arm, thereby preventing water leakage. By using a connection structure between the notch and the mounting arm, the cover can be placed low, making it possible to reduce the overall size of the vacuum breaker.

[0012] The cutout portion is provided between the air inlet and the exhaust port.

[0013] As a result, the vacuum breaker provides a notch at the location where cleaning water overflows from the air inlet and collects and discharges cleaning water leaking from the notch using the second discharge section. Therefore, the vacuum breaker can prevent cleaning water from leaking from locations other than where the notch is provided, and can discharge cleaning water leaking from the notch using the second discharge section. Therefore, the vacuum breaker makes it easy to take measures against leakage while suppressing the occurrence of leakage.

[0014] The cutout portion includes a first cutout portion formed in the vicinity of the air inlet port, and a second cutout portion formed in the vicinity of the curved wall portion of the outer circumferential wall portion of the water receiving portion.

[0015] As a result, the vacuum breaker is provided with a first notch and a second notch in the water receiving section at a location where cleaning water is likely to leak, and cleaning water leaking from each notch can be discharged by the second discharge section. Therefore, the vacuum breaker makes it easy to take measures against water leakage while suppressing the occurrence of water leakage.

[0016] The discharge path has an open end on the first discharge portion side and a closed end on the opposite side to the first discharge portion side.

[0017] As a result, the vacuum breaker discharges flush water that has flowed into the discharge path from the end on the first discharge part side, making it possible for the vacuum breaker to suppress the occurrence of water leakage.

[0018] The discharge passage is open at the top.

[0019] This enables the vacuum breaker to discharge cleaning water leaking from places other than the notch by the second discharge portion.

[0020] The end of the discharge passage on the first discharge portion side is provided above a tank joint through which flush water is discharged from the first discharge portion.

[0021] As a result, the vacuum breaker can guide the cleaning water discharged from the discharge path to the first discharge section, and can prevent the cleaning water discharged from the discharge path from splashing.

[0022] The second discharge portion includes a connection member that connects an end portion on the first discharge portion side and an outer wall of the first discharge portion.

[0023] This allows the vacuum breaker to guide the cleaning water discharged from the discharge passage to the first discharge section via the connection member. Therefore, the vacuum breaker can prevent the cleaning water discharged from the discharge passage from splashing. In addition, the vacuum breaker supports the end of the second discharge section on the first discharge section side with the connection member, thereby increasing the strength of the end of the second discharge section on the first discharge section side. Effect of the Invention

[0024] According to one aspect of the embodiment, the occurrence of water leakage can be suppressed. [Brief description of the drawings]

[0025] [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 plan view of the vacuum breaker and its surroundings with the cover removed. [Diagram 5] FIG. 5 is a cross-sectional view taken along line VV of FIG. [Figure 6] FIG. 6 is a diagram showing the flow of cleaning water leaking between the mounting arm and the notch. [Figure 7] FIG. 7 is a diagram for explaining the flow of cleaning water discharged from the discharge passage. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] 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.

[0027] <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.

[0028] 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.

[0029] 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.

[0030] 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).

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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 first discharge section 687 into tank 800. Discharge of cleaning water overflowing into water receiving section 686 will be described later.

[0037] 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.

[0038] 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.

[0039] 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 .

[0040] <Vacuum breaker configuration> Next, a specific configuration of the vacuum breaker 680 according to the embodiment will be described with reference to Fig. 2 to Fig. 5. Fig. 2 is a perspective view of the vacuum breaker 680 and its surroundings in the cleaning water supplying apparatus 1. Fig. 3 is a plan view of the vacuum breaker 680 and its surroundings in the cleaning water supplying apparatus 1. Fig. 4 is a plan view of the vacuum breaker 680 and its surroundings with the cover 682 removed. Fig. 5 is a VV cross-sectional view of Fig. 4.

[0041] 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 first discharge portion 687, a guide portion 688, and a second discharge portion 689. Main body 681 is formed with a first atmosphere inlet 690a and a second atmosphere inlet 690b.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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 so as to penetrate the first protruding portion 696a in the vertical direction. That is, the first atmosphere inlet 690a is formed so as 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.

[0047] 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.

[0048] 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.

[0049] 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 a first exhaust section 687. The bottom of the third bottom 697c may be at the same height as the bottom of the second bottom 697b.

[0050] The water receiving portion 686 receives the washing water overflowing from the first atmosphere inlet 690a and the second atmosphere inlet 690b.

[0051] A cutout portion 700 is formed in outer peripheral wall portion 698. Cutout portion 700 is formed so as to be recessed downward from the upper end surface of outer peripheral wall portion 698. Cutout portion 700 is provided between second atmosphere inlet port 690b and exhaust port 687a in plan view. Specifically, cutout portion 700 is provided on the exhaust port 687a side relative to second atmosphere inlet port 690b in plan view.

[0052] A plurality of cutout portions 700 are formed. Specifically, the cutout portions 700 include a first cutout portion 700a and a second cutout portion 700b. The mounting arm 705 of the cover 682 is disposed in the cutout portions 700. Note that the number of cutout portions 700 is not limited to two. The number of cutout portions 700 may be one, or three or more.

[0053] The first cutout portion 700a and the second cutout portion 700b are formed in the first outer peripheral wall portion 698a of the outer peripheral wall portion 698 on the second atmosphere introduction port 690b side.

[0054] The second cutout portion 700b is formed closer to the second outer peripheral wall portion 698b than the first cutout portion 700a. The second outer peripheral wall portion 698b is an outer peripheral wall portion that is connected to the end portion of the first outer peripheral wall portion 698a on the first discharge portion 687 side via the curved wall portion 698c. The second cutout portion 700b is formed near the curved wall portion 698c that connects the first outer peripheral wall portion 698a and the second outer peripheral wall portion 698b.

[0055] 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.

[0056] An opening 688a is formed in the wall portion 688. The opening 688a is provided on the second atmosphere inlet port 690b side. Specifically, the opening 688a is formed by the wall portion 688 being discontinuous around the second atmosphere inlet port 690b, and opens toward the second atmosphere inlet port 690b side.

[0057] 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.

[0058] First discharge portion 687 discharges cleaning water overflowing into water receiving portion 686. First discharge portion 687 discharges cleaning water overflowing into water receiving portion 686 into tank 800. Specifically, first discharge portion 687 discharges cleaning water overflowing into water receiving portion 686 into tank joint 702. Tank joint 702 is provided above tank 800, and allows cleaning water discharged from water receiving portion 686 to flow into tank 800.

[0059] The first discharge portion 687 protrudes downward from the fourth bottom portion 697d of the water receiving portion 686. An outlet 687a is formed in the first discharge portion 687. The outlet 687a is formed along the up-down direction. The outlet 687a is formed to penetrate the fourth bottom portion 697d of the water receiving portion 686.

[0060] The second discharge portion 689 discharges wash water leaking from between the water receiving portion 686 and the cover 682. The second discharge portion 689 is formed along the outer wall of the outer peripheral wall portion 698 of the water receiving portion 686 up to the vicinity of the first discharge portion 687. Specifically, the second discharge portion 689 is formed on the outer wall of the first outer peripheral wall portion 698a, the outer wall of the curved wall portion 698c, and the outer wall of the second outer peripheral wall portion 698b. The second discharge portion 689 is formed in a substantially L-shape in a plan view.

[0061] A discharge passage 689a is formed in the second discharge portion 689. The discharge passage 689a is formed along the outer wall of the outer peripheral wall portion 698 (the first outer peripheral wall portion 698a, the curved wall portion 698c, and the second outer peripheral wall portion 698b) of the water receiving portion 686 up to the vicinity of the first discharge portion 687. The discharge passage 689a is formed in a range including below the first mounting arm 705a and the second mounting arm 705b described later. The discharge passage 689a is formed along the outer wall of the outer peripheral wall portion 698, passing below the first mounting arm 705a and below the second mounting arm 705b, up to the vicinity of the first discharge portion 687. An end of the discharge passage 689a on the first discharge portion 687 side is provided above the tank joint 702. The discharge passage 689a is formed in a substantially L-shape in a plan view.

[0062] Discharge path 689a is formed so that its height decreases toward the end on the first discharge portion 687 side. Discharge path 689a is open at the end on the first discharge portion 687 side, and is closed at the end on the opposite side to first discharge portion 687. Discharge path 689a is open at the top. Discharge path 689a is formed so that its height is highest at the end on the opposite side to first discharge portion 687.

[0063] The second discharge portion 689 includes a connection member 689b. The connection member 689b connects the end of the second discharge portion 689 on the first discharge portion 687 side to the outer wall of the first discharge portion 687. The connection member 689b is a rib that connects the lower end of the end on the first discharge portion 687 side to the outer wall of the first discharge portion 687. The connection member 689b extends downward from the lower end of the end on the first discharge portion 687 side. The connection member 689b may be formed so as to be inclined from the lower end of the end on the first discharge portion 687 side. In addition, the connection member 689b is provided with a rib so as to extend in the up-down direction from the center of the front-rear direction of the first discharge portion 687. Since the rib is provided up to the center of the front-rear direction of the first discharge portion 687, the washing water discharged from the first discharge portion 687 and the washing water discharged from the discharge path 689a are easily merged, and the washing water discharged from the discharge path 689a is smoothly discharged.

[0064] The cover 682 includes a cover body 704 and an attachment arm 705. The cover body 704 is provided so as to cover the upper side of the water receiving portion 686. The cover body 704 is attached to the water receiving portion 686 by the attachment arm 705. The attachment arm 705 includes a first attachment arm 705a and a second attachment arm 705b. It should be noted that the number of attachment arms 705 is not limited to two. The number of attachment arms 705 may be one, or three or more.

[0065] The first mounting arm 705a protrudes from the cover body 704. The first mounting arm 705a is provided so as to protrude horizontally from the cover body 704 and then bend downward. The first mounting arm 705a is formed in a substantially L-shape. The first mounting arm 705a is disposed in the first cutout portion 700a and is provided so as to straddle the upper part of the discharge passage 689a.

[0066] A first engagement portion 705c is provided at the lower end of the first attachment arm 705a. The first engagement portion 705c engages with a first engagement claw 707a provided below the second ejection portion 689.

[0067] The second mounting arm 705b is provided closer to the second outer circumferential wall portion 698b than the first mounting arm 705a. The second mounting arm 705b protrudes from the cover body 704. The second mounting arm 705b is provided so as to protrude horizontally from the cover body 704 and then bend downward. The first mounting arm 705a is formed in a substantially L-shape. The second mounting arm 705b is disposed in the second cutout portion 700b and is provided so as to straddle the upper part of the discharge passage 689a.

[0068] A second engagement portion 705d is provided at the lower end of the second mounting arm 705b. The second engagement portion 705d engages with a second engagement claw 707b provided below the second ejection portion 689. Each engagement portion of the mounting arms 705a and 705b may be an engagement claw.

[0069] 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 port 690a and the second atmosphere inlet port 690b. The valve body 683 includes a first valve body 683a and a second valve body 683b.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] <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.

[0075] However, for example, when the first water passage 691a (tank side water supply passage 330) is in a water flow state, dust may be 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. Similarly, for example, dust may be caught between the second valve body 683b and the lower end of the second protrusion 696b, and the second valve body 683b may malfunction, and the first valve body 683a may not be able to close the first atmosphere introduction port 690a.

[0076] In such a case, water overflows from the first atmosphere inlet 690a or the second atmosphere inlet 690b into the water receiver 686. The cleaning water overflowing into the water receiver 686 is discharged into the tank joint 702 via the outlet 687a of the first discharge part 687. The cleaning water discharged into the tank joint 702 flows into the tank 800.

[0077] The water receiving portion 686 is formed with a wall portion 688 that guides the water overflowing from the first atmosphere inlet 690a to the second atmosphere inlet 690b. Therefore, a portion of the wash water overflowing from the first atmosphere inlet 690a can be discharged from the second atmosphere inlet 690b to the rim side water supply passage 320.

[0078] The cleaning water overflowing into the water receiving portion 686 may leak from between the cover 682 and the water receiving portion 686. For example, when the cleaning water overflows beyond the drainage capacity of the first discharge portion 687 or the second air inlet 690b, the cleaning water may leak from between the cover 682 and the water receiving portion 686. Such leakage of the cleaning water is likely to occur from a gap formed between the cover 682 and the water receiving portion 686. In the vacuum breaker 680, the cleaning water may leak from between the mounting arm 705 of the cover 682 and the notch 700 of the water receiving portion 686.

[0079] Mounting arm 705 is disposed in cutout 700 formed in outer peripheral wall 698 of water receiving portion 686. As a result, a gap is formed at a position lower than the upper end surface of outer peripheral wall 698, and cleaning water is likely to leak from the gap. In other words, the location where cutout 700 is formed is a weak portion through which cleaning water is likely to leak.

[0080] Cleansing water leaking from between mounting arm 705 and cutout 700 flows into discharge path 689a of second discharge portion 689, as shown by arrows A and B in Fig. 6. The cleansing water that flows into discharge path 689a flows toward first discharge portion 687. Fig. 6 is a diagram showing the flow of cleaning water leaking from between mounting arm 705 and cutout 700.

[0081] The cleaning water that flows into the discharge path 689a is discharged from the end of the discharge path 689a on the first discharge portion 687 side to the tank joint 702. For example, as shown in Fig. 7, the cleaning water discharged from the discharge path 689a flows along the outer wall of the first discharge portion 687 along the connecting member 689b, and is discharged along the outer wall of the first discharge portion 687 to the tank joint 702. Fig. 7 is a diagram explaining the flow of the cleaning water discharged from the discharge path 689a.

[0082] Discharge path 689a of second discharge portion 689 is formed so that mounting arm 705 straddles the upper part. Therefore, cleaning water leaking from the gap between mounting arm 705 and cutout portion 700 flows into discharge path 689a without leaking from second discharge portion 689. In addition, discharge path 689a is open at the top. Therefore, discharge path 689a collects and discharges cleaning water leaking from first outer circumferential wall portion 698a and second outer circumferential wall portion 698b.

[0083] Furthermore, the end of discharge path 689a opposite to first discharge portion 687 is closed. Therefore, the cleaning water in discharge path 689a flows toward first discharge portion 687 without leaking from the end of discharge path 689a opposite to first discharge portion 687.

[0084] In addition, by providing the notch 700 in the water receiving portion 686 at a portion where the cleaning water is likely to leak, the occurrence of leakage of the cleaning water from other portions is suppressed. For example, in the water receiving portion 686, the cleaning water overflowing from the first atmosphere inlet 690a is guided to the second atmosphere inlet 690b by the wall portion 688. Moreover, the cleaning water overflowing into the second atmosphere inlet 690b flows toward the first discharge portion 687. Therefore, the cleaning water is likely to leak near the second atmosphere inlet 690b. Moreover, the flow direction of the cleaning water flowing from the second atmosphere inlet 690b side toward the first discharge portion 687 is largely changed at the curved wall portion 698c that connects the first outer peripheral wall portion 698a and the second outer peripheral wall portion 698b. Therefore, the cleaning water is likely to leak near the curved wall portion 698c.

[0085] When measures are taken to prevent cleaning water from leaking from places where cleaning water is likely to leak, it can be difficult to predict the places where cleaning water will leak. By providing first cutout portion 700a near second atmosphere inlet 690b and second cutout portion 700b near curved wall portion 698c, leakage from other places is suppressed, making it easier to take measures against leakage.

[0086] <Effects> The vacuum breaker 680 includes a main body 681 and a valve body 683. The main body 681 has air inlets 690a and 690b that communicate with water passages 691a and 691b that connect water inlets 692a and 692b and water outlets 693a and 693b. The valve body 683 closes the air inlets 690a and 690b when the water passages 691a and 691b are in a water-passing state, and opens the air inlets 690a and 690b when the water passages 691a and 691b are in a water-blocking state. The main body 681 includes a water receiver 686, a cover 682, a first discharge portion 687, and a second discharge portion 689. The water receiver 686 receives the cleaning water overflowing from the air inlets 690a and 690b. Cover 682 covers the upper side of water receiving portion 686. First discharge portion 687 is formed with discharge port 687a for discharging cleaning water overflowing into water receiving portion 686 from water receiving portion 686. Second discharge portion 689 discharges cleaning water leaking from between water receiving portion 686 and cover 682.

[0087] As a result, even if an amount of water that cannot be drained overflows from first discharge portion 687, vacuum breaker 680 can discharge cleaning water leaking from between water receiving portion 686 and cover 682 by second discharge portion 689. Therefore, vacuum breaker 680 can suppress the occurrence of water leakage.

[0088] In the second discharge portion 689, a discharge passage 689a is formed which extends along the outer wall of the outer peripheral wall portion 698 of the water receiving portion 686 to the vicinity of the first discharge portion 687.

[0089] As a result, vacuum breaker 680 can guide the cleaning water discharged by second discharge portion 689 to first discharge portion 687, and thereby discharge the cleaning water discharged via first discharge portion 687 and second discharge portion 689 together. Therefore, vacuum breaker 680 can prevent the discharge path of cleaning water overflowing into water receiving portion 686 from becoming complicated.

[0090] A cutout 700 is formed in the water receiving portion 686, in which an attachment arm 705 of the cover 682 is disposed. The attachment arm 705 is provided above and straddling the discharge path 689a.

[0091] As a result, vacuum breaker 680 can discharge cleaning water leaking from between cutout 700 and mounting arm 705 by second discharge portion 689, thereby suppressing the occurrence of water leakage. By using a connection structure between cutout 700 and mounting arm 705, cover 682 can be provided low, and the overall size of vacuum breaker 680 can be reduced.

[0092] The cutout portion 700 is provided between the second atmosphere inlet 690b and the exhaust port 687a.

[0093] As a result, vacuum breaker 680 provides cutout 700 at a location where cleaning water overflows from second atmosphere inlet 690b flows, and collects and discharges cleaning water leaking from cutout 700 using second discharge section 689. Therefore, vacuum breaker 680 can prevent cleaning water from leaking from a location other than where cutout 700 is provided, and can discharge cleaning water leaking from cutout 700 using second discharge section 689. Therefore, vacuum breaker 680 makes it easy to take measures against water leakage while preventing the occurrence of water leakage.

[0094] The cutout portion 700 includes a first cutout portion 700a and a second cutout portion 700b. The first cutout portion 700a is formed in the vicinity of the second air inlet port 690b. The second cutout portion 700b is formed in the vicinity of the curved wall portion 698c of the outer peripheral wall portion 698 of the water receiving portion 686.

[0095] As a result, the vacuum breaker 680 is provided with the first notch 700a and the second notch 700b at a location in the water receiving portion 686 where cleaning water is likely to leak, and cleaning water leaking from each notch 700 can be discharged by the second discharge portion 689. Therefore, the vacuum breaker 680 makes it easy to take measures against water leakage while suppressing the occurrence of water leakage. The first notch 700 is provided in the middle of the discharge path 689a, and is disposed with a space provided up to the end of the discharge path 689a opposite the first discharge portion 687, so that the cleaning water discharged from the first notch 700 can be properly discharged to the discharge path 689a.

[0096] The discharge path 689a has an open end on the first discharge portion 687 side, and a closed end on the opposite side to the end on the first discharge portion 687 side.

[0097] As a result, vacuum breaker 680 discharges cleaning water that has flowed into discharge path 689a from the end on the side of first discharge portion 687. Therefore, vacuum breaker 680 can suppress the occurrence of water leakage.

[0098] The discharge passage 689a opens upward.

[0099] This allows the vacuum breaker 680 to discharge cleaning water leaking from places other than the notch 700 via the second discharge portion 689.

[0100] The second discharge portion 689 includes a connection member 689b that connects an end portion on the first discharge portion 687 side and an outer wall of the first discharge portion 687.

[0101] As a result, the vacuum breaker 680 can guide the cleaning water discharged from the discharge passage 689a to the first discharge portion 687 via the connection member 689b. Therefore, the vacuum breaker 680 can prevent the cleaning water discharged from the discharge passage 689a from splashing. In addition, the vacuum breaker 680 supports the end of the second discharge portion 689 on the first discharge portion 687 side by the connection member 689b, and can increase the strength of the end of the second discharge portion 689 on the first discharge portion 687 side.

[0102] The end of discharge path 689a on the first discharge portion 687 side is provided above tank joint 702 through which cleaning water is discharged from first discharge portion 687.

[0103] As a result, vacuum breaker 680 can guide the cleaning water discharged from discharge path 689a to first discharge portion 687, and can prevent the cleaning water discharged from discharge path 689a from splashing.

[0104] <Modification> In a modified example, the vacuum breaker 680 may be provided upstream of the switching valve 660. A vacuum breaker 680 according to a modified example may be provided in a valve unit 600 of a flush toilet 100 that has a single water outlet that discharges flush water into the bowl portion 210.

[0105] 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]

[0106] 1 Cleaning water supply device 600 Valve Unit 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 1st discharge section 687a Outlet 689 2nd discharge section 689a Exhaust channel 689b Connection parts 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 698 Outer wall 698a 1st outer peripheral wall 698b Second outer peripheral wall 698c Curved wall 700 Notch 702 Tank joint 700a First notch 700b Second notch 705 Mounting Arm 705a First mounting arm 705b Second mounting arm 800 Tank

Claims

1. a main body having an air inlet communicating with a water passage connecting the water inlet and the water outlet; a valve body that closes the air inlet port when the water passage is in a water-passing state and opens the air inlet port when the water passage is in a water-non-passing state; Equipped with The main body portion is a water receiving portion for receiving cleaning water overflowing from the air inlet; A cover for covering an upper side of the water receiving portion; a first discharge portion in which a discharge port is formed to discharge cleaning water overflowing from the water receiving portion; a second drainage section that drains cleaning water leaking from between the water receiving section and the cover; A vacuum breaker equipped with

2. 2. The vacuum breaker according to claim 1, wherein the second discharge portion is formed with a discharge passage extending along an outer wall of the outer peripheral wall portion of the water receiving portion to a vicinity of the first discharge portion.

3. The water receiving portion is formed with a notch in which the mounting arm of the cover is disposed, The vacuum breaker according to claim 2 , wherein the attachment arm is provided above and spanning the discharge passage.

4. The vacuum breaker according to claim 3 , wherein the cutout portion is provided between the air inlet and the exhaust port.

5. The cutout portion is a first cutout portion formed in the vicinity of the air inlet; 5. The vacuum breaker according to claim 3, further comprising a second cutout portion formed in an outer peripheral wall portion of the water receiving portion in the vicinity of the curved wall portion.

6. The vacuum breaker according to any one of claims 2 to 5, wherein the discharge path has an open end on the side of the first discharge portion and a closed end on the opposite side to the end on the side of the first discharge portion.

7. The vacuum breaker according to any one of claims 2 to 6, wherein the discharge passage is open upward.

8. 8. The vacuum breaker according to claim 2, wherein an end of the discharge passage on the side of the first discharge portion is provided above a tank joint through which cleaning water is discharged from the first discharge portion.

9. The vacuum breaker according to any one of claims 1 to 8, wherein the second discharge section includes a connection member that connects an end portion on the first discharge section side and an outer wall of the first discharge section.

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