Washing water supply device

Abstract

To lower a leakage water level for downsizing by suppressing blowing-up of washing water.SOLUTION: A washing water supply device comprises a tank, a vacuum breaker, a water discharge port, an introduction port, and an introduction wall. The tank stores washing water for a toilet bowl body. The vacuum breaker comprises: a water passage including a water inlet port and a water outlet port; an atmosphere introduction port making the water passage communicate with the outside; a valve body that makes the water inlet port communicate with the water outlet port at the time of water passing and makes the water passage communicate with the atmosphere introduction port at the time of non-water passing; and a water reception part for receiving washing water overflowing from the atmosphere introduction port. The water discharge port discharges washing water received by the water reception part. The introduction port introduces washing water into a discharge water tank for storing washing water from the water discharge port. The introduction wall is provided at the periphery of the introduction port so as to surround the introduction port. The water discharge port is disposed at a position deviated from right above the introduction port.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The disclosed embodiments relate to a washing water supply device.

Background Art

[0002] Conventionally, a washing water supply device for supplying washing water for toilet washing is provided with a vacuum breaker. In the vacuum breaker, even when the air inlet cannot be blocked, there is a water receiving part for receiving the washing water overflowing from the air inlet so as not to leak water outside the machine, and the washing water is discharged from the water receiving part to a drainage tank (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a washing water supply device, it is necessary to ensure a certain vertical distance from the position where the backflow prevention mechanism functions to the water surface (overflow water level) of the water receiving part to prevent overflow in order to ensure the water level rise when negative pressure is applied.

[0005] Due to the trend of miniaturization of recent flush toilets, it is necessary to miniaturize the washing water supply device incorporated in the flush toilet. In order to miniaturize the washing water supply device, it is necessary to lower the overflow water level together with the position where the backflow prevention mechanism functions. Also, in order to lower the overflow water level, it is necessary to suppress the splashing of the washing water from the backflow prevention valve of the drainage tank.

[0006] One aspect of the embodiment aims to provide a washing water supply device that can suppress the splashing of washing water and lower the overflow water level for miniaturization.

Means for Solving the Problems

[0007] A cleaning water supply device according to an aspect of the embodiment includes a tank that stores cleaning water supplied to a toilet body, a water passage having a water inlet on the upstream side and a water outlet on the downstream side, an air inlet that communicates the water passage with the outside, and is provided inside the water passage. A valve body that operates by the water pressure of the cleaning water to communicate the water inlet and the water outlet during water flow and communicate the water passage and the air inlet during non-water flow, and a water receiving portion that receives the cleaning water overflowing from the air inlet. A vacuum breaker having a drain port for discharging the cleaning water received by the water receiving portion, an inlet for introducing the cleaning water into the inside of a drain tank that stores the cleaning water discharged from the drain port, and an introduction wall provided on the outer peripheral portion of the inlet so as to surround the inlet. The drain port is disposed at a position offset from directly above the inlet.

[0008] According to such a configuration, since the cleaning water is discharged from a position offset from directly above the inlet, it is possible to prevent the cleaning water overflowing from the inlet from filling the tip of the drain port, and the cleaning water cannot be sucked up by capillary action. As a result, the splashing of the cleaning water can be suppressed, and the overflow water level can be lowered for miniaturization.

[0009] Further, in the cleaning water supply device, a lid portion is provided above the inlet and at a position higher than the introduction wall, and covers the inlet in a top view.

[0010] According to such a configuration, since the lid portion functions as a holding lid for the inlet, the splashing of the cleaning water can be further suppressed, and the overflow water level can be lowered.

[0011] Further, in the cleaning water supply device, there is an open space between the lid portion and the introduction wall.

[0012] According to such a configuration, the splashing cleaning water W2 can be released from the open space. As a result, the splashing of the cleaning water can be further suppressed, and the overflow water level can be lowered.

[0013] Further, in the cleaning water supply device, the lid portion forms a concave portion above the introduction port.

[0014] According to such a configuration, since the lid portion forms a concave portion above the introduction port, the splashing of the cleaning water can be further suppressed, and the overflow water level can be lowered.

[0015] Further, in the cleaning water supply device, an air intake port for discharging air from the drain tank is disposed on the side of the introduction port, the lid portion is provided to the outside of the introduction wall in the direction of the air intake port, and has an open space in the direction opposite to the direction of the air intake port.

[0016] According to such a configuration, it is possible to prevent the cleaning water overflowing from the introduction port from entering the air intake port. Further, the cleaning water can be discharged from the open space in the direction opposite to the direction of the air intake port. Thereby, the splashing of the cleaning water can be further suppressed, and the overflow water level can be lowered.

Advantages of the Invention

[0017] According to one aspect of the embodiment, it is possible to suppress the splashing of the cleaning water and lower the overflow water level for miniaturization.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

BEST MODE FOR CARRYING OUT THE INVENTION

[0019] Hereinafter, embodiments of the washing water supply device disclosed in the present application will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments shown below. Also, the drawings are schematic, and it should be noted that the dimensional relationships between elements, the ratios of the elements, etc. may be different from reality. There may also be parts where the dimensional relationships and ratios are different between the drawings.

[0020] <Washing Water Supply Device and Water-Washed Toilet Bowl> First, the washing water supply device 1 and the water-washed toilet bowl 100 according to the embodiment will be described with reference to FIG. 1. FIG. 1 is an overall configuration diagram showing the water-washed toilet bowl 100 including the washing water supply device 1 according to the embodiment.

[0021] As shown in FIG. 1, the water-washed toilet bowl 100 includes, for example, a toilet bowl main body 200 placed on the floor surface of the toilet room, and a washing water supply device 1 disposed behind the toilet bowl main body 200 and supplying washing water to the toilet bowl main body 200.

[0022] The toilet bowl main body 200 includes a bowl portion 210 for receiving dirt, and a drain trap pipe line 220 extending rearward from the bottom of the bowl portion 210. In the bowl portion 210, a rim water discharge port 212 for performing rim water discharge and a jet water discharge port 214 for performing jet water discharge are formed. The rim water discharge port 212 is formed at the upper rear of the bowl portion 210 and discharges washing water along the upper edge of the bowl portion 210.

[0023] The jet water discharge port 214 is formed at the bottom of the bowl portion 210 and discharges washing water toward the drain trap pipe line 220. By discharging the washing water from such a jet water discharge port 214, the drain trap pipe line 220 can be rapidly filled with the washing water, and the siphon action can be generated early. The drain trap pipe line 220 forms water seal and communicates with a sewer pipe (not shown).

[0024] The cleaning water supply device 1 includes a valve unit 600 controlled by a control unit (not shown), a tank 800 provided downstream of the valve unit 600 for storing cleaning water, and a pressurizing pump 900 provided downstream in the tank 800 for pressurizing the cleaning water.

[0025] On the upstream side of the valve unit 600, a water supply path 310 for supplying cleaning water from a water supply source (not shown) is connected. Also, on the downstream side of the valve unit 600, a rim-side water supply path 320 for supplying cleaning water to the rim water outlet 212 and a tank-side water supply path 330 for supplying cleaning water to the tank 800 are connected.

[0026] The valve unit 600 includes a constant flow rate valve 620, a diaphragm-type water supply valve 640 provided downstream of the constant flow rate 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.

[0027] The constant flow rate valve 620 makes the flow rate of the cleaning water flowing from the water supply path 310 into the constant flow rate valve 620 and heading downstream constant. The water supply valve 640 is configured to include, for example, a diaphragm, and by opening and closing it, the discharging and stopping of the cleaning water at the rim water outlet 212 and the jet water outlet 214 are switched.

[0028] The switching valve 660 switches the supply destination of the cleaning water from the water supply source to, for example, the rim water outlet 212 of the toilet body 200 and the tank 800. That is, the switching valve 660 supplies the cleaning water toward the rim-side water supply path 320 or the tank-side water supply path 330.

[0029] The vacuum breaker 680 prevents the backflow of the washing water. The specific configuration of the vacuum breaker 680 will be described later. Although the washing water may overflow into the water receiving portion 686 due to a malfunction of the valve body 683 of the vacuum breaker 680, the washing water that has overflowed into the water receiving portion 686 is collected by the water receiving portion 686 and then discharged into the tank 800 through the drain port 687a (see FIG. 3) of the drain portion 687. That is, the tank 800 also functions as a drain tank that stores the washing water discharged from the drain port 687a.

[0030] The tank 800 stores the washing water supplied to the jet outlet 214 of the toilet body 200. A pump-side water supply passage 340 is connected to the lower part of the tank 800, and a pressurizing pump 900 is connected to the downstream end of the pump-side water supply passage 340.

[0031] In addition, an overflow passage 342 is connected to the upper part of the tank 800. The overflow passage 342 allows the washing water to flow out to the toilet body 200 when, for example, the washing water above the specified water level WL is supplied inside the tank 800. Specifically, the overflow passage 342 allows the washing water that has reached the specified water level WL or higher to flow out to the jet outlet 214 of the toilet body 200 via the jet-side water supply passage 350 without passing through the pressurizing pump 900.

[0032] The pressurizing pump 900 is connected to the jet outlet 214 by the jet-side water supply passage 350, pressurizes the washing water stored in the tank 800, and supplies it to the jet outlet 214 via the jet-side water supply passage 350.

[0033] <Vacuum Breaker> Next, the vacuum breaker 680 according to the embodiment will be described with reference to FIGS. 2 to 4. FIG. 2 is a perspective view of the periphery of the vacuum breaker 680 in the washing water supply device 1. FIG. 3 is a plan view of the periphery of the vacuum breaker 680 in the washing water supply device 1. Note that FIG. 3 shows the vacuum breaker 680 with the cover 682 removed. FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3.

[0034] The vacuum breaker 680 includes a main body 681, a cover 682, and a valve body 683. The main body 681 includes a water passage portion 685, a water receiving portion 686, a drainage portion 687, and a guiding portion 688. In the main body 681, a first air inlet 690a and a second air inlet 690b, which are air inlets, are formed.

[0035] In the water passage portion 685, a first water passage 691a and a second water passage 691b are formed. The first water passage 691a is a flow path connecting one discharge port of the switching valve 660 and the tank-side water supply path 330. Specifically, the first water passage 691a connects an inlet (first inlet) 692a through which cleaning water flows from one discharge port of the switching valve 660 and an outlet (first outlet) 693a that discharges the cleaning water to the tank-side water supply path 330.

[0036] The second water passage 691b is a flow path connecting the other discharge port of the switching valve 660 and the rim-side water supply path 320. Specifically, the second water passage 691b connects an inlet (second inlet) 692b through which cleaning water flows from the other discharge port of the switching valve 660 and an outlet (second outlet) 693b that discharges the cleaning water to the rim-side water supply path 320.

[0037] In the water passage portion 685, a first hole 695a communicating with the first water passage 691a and a second hole 695b communicating with the second water passage 691b are formed. The first hole 695a and the second hole 695b are formed above the water passage portion 685. A first protruding portion 696a of the water receiving portion 686 is inserted into the first hole 695a. A second protruding portion 696b of the water receiving portion 686 is inserted into the second hole 695b.

[0038] The water receiving portion 686 is provided above the water passage portion 685. The upper end portion of the water receiving portion 686 is open, and the cover 682 is attached thereto.

[0039] The water receiving part 686 includes a first protruding part 696a and a second protruding part 696b. The first protruding part 696a protrudes downward from the lower surface of the water receiving part 686. A first air inlet 690a, which is an air inlet, is formed in the first protruding part 696a. The first air inlet 690a is formed so as to penetrate the first protruding part 696a in the vertical direction. That is, the first air inlet 690a is formed so as to penetrate the bottom 697 of the water receiving part 686 in the vertical direction. The first air inlet 690a communicates with the first water passage 691a.

[0040] The second protruding part 696b protrudes downward from the lower surface of the water receiving part 686. A second air inlet 690b, which is an air inlet, is formed in the second protruding part 696b. The second air inlet 690b is formed so as to penetrate the second protruding part 696b in the vertical direction. That is, the second air inlet 690b is formed so as to penetrate the bottom 697 of the water receiving part 686 in the vertical direction. The second air inlet 690b communicates with the second water passage 691b.

[0041] The bottom 697 of the water receiving part 686 includes a plurality of regions with different heights. Specifically, the bottom 697 of the water receiving part 686 includes a first bottom 697a, a second bottom 697b, a third bottom 697c, and a fourth bottom 697d.

[0042] The first bottom 697a has the highest bottom surface height among the bottoms 697, and the first air inlet 690a is formed therein. The bottom surface of the second bottom 697b is lower in height than the bottom surface of the first bottom 697a. The second air inlet 690b is formed in the second bottom 697b. The bottom surface of the third bottom 697c is lower in height than the bottom surface of the second bottom 697b. The bottom surface of the fourth bottom 697d is lower in height than the bottom surface of the third bottom 697c. In other words, the bottom surface heights of the first bottom 697a, the second bottom 697b, the third bottom 697c, and the fourth bottom 697d decrease in this order. A drainage part 687 is provided in the fourth bottom 697d. Note that the bottom surface of the third bottom 697c may be at the same height as the bottom surface of the second bottom 697b.

[0043] The water receiving part 686 receives the cleaning water that overflows from the first air inlet 690a and the second air inlet 690b. An outer peripheral wall part 698 is formed at the periphery of the water receiving part 686.

[0044] The guiding part 688 guides the cleaning water that overflows from the first air inlet 690a to the second air inlet 690b. The guiding part 688 is a wall part that protrudes upward from the bottom surface of the water receiving part 686. Hereinafter, the guiding part 688 is referred to as "wall part 688". The wall part 688 is provided inside the outer peripheral wall part 698. The wall part 688 guides the cleaning water that overflows from the first air inlet 690a to the second air inlet 690b. The wall part 688 is provided so as to surround the first air inlet 690a. The wall part 688 protrudes upward from the periphery of the first bottom part 697a.

[0045] The wall part 688 includes a first wall part 688a and a second wall part 688b. The second wall part 688b is lower in height than the first wall part 688a. The second wall part 688b is provided on the side of the drainage part 687 with respect to the first wall part 688a or on the side of the second air inlet 690b with respect to the first wall part 688a.

[0046] An opening 688c is formed in the wall part 688. The opening 688c is provided on the side of the second air inlet 690b. The opening 688c is formed by the wall part 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 part 688a on the second air inlet 690b side and the end of the second wall part 688b on the second air inlet 690b side not being connected.

[0047] The height of the wall part 688 is lower than the height of the outer peripheral wall part 698. Specifically, the height of the wall part 688 is lower than the height of the outer peripheral wall part 698 that protrudes upward from the first bottom part 697a, the second bottom part 697b, and the third bottom part 697c.

[0048] The drain section 687 discharges the cleaning water of the water receiving section 686. The drain section 687 discharges the cleaning water of the water receiving section 686 to the tank 800. The drain section 687 discharges the cleaning water of the water receiving section 686 to the tank 800 via the tank joint 702. The tank joint 702 is provided above the tank 800 and allows the cleaning water discharged from the drain port 687a to flow into the tank 800.

[0049] Also, the drain section 687 protrudes downward from the fourth bottom 697d of the water receiving section 686. As described above, a drain port 687a is formed in the drain section 687. The drain port 687a is formed along the vertical direction. The drain port 687a is formed so as to penetrate the fourth bottom 697d of the water receiving section 686.

[0050] 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.

[0051] The first valve body 683a moves up and down by the water pressure of the cleaning water flowing through the first water passage 691a. The first valve body 683a is located in the first water passage 691a, that is, the cleaning water flows through the water supply passage 330 on the tank side. When water is flowing (when in the water flow state), it rises by the water pressure of the cleaning water and seats on the lower end of the first protrusion 696a. Thereby, the first valve body 683a closes the lower end of the first air inlet 690a and closes the first air inlet 690a. The first valve body 683a closes the first air inlet 690a when the first water passage 691a is in the water flow state, and does not communicate the first water passage 691a with the outside.

[0052] Also, when the first water passage 691a is not passing water (when in a non-water-passing state), the first valve body 683a descends due to its own weight, separates from the lower end of the first protrusion 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, communicates the first water passage 691a with the outside, and introduces outside air into the first water passage 691a. Thereby, it is prevented that the inside of the first water passage 691a becomes a negative pressure, and backflow of the cleaning water in the first water passage 691a, that is, the tank-side water supply passage 330, is prevented.

[0053] The second valve body 683b moves up and down by the water pressure of the cleaning water flowing through the second water passage 691b. When the cleaning water flows through the second water passage 691b, that is, when in a water-passing state, the second valve body 683b rises by the water pressure of the cleaning water and seats on the lower end of the second protrusion 696b. Thereby, the second valve body 683b closes the lower end of the second air inlet 690b and closes the second air inlet 690b. When the second water passage 691b is in a water-passing state, the second valve body 683b closes the second air inlet 690b and does not communicate the second water passage 691b with the outside.

[0054] Also, when the second water passage 691b is not passing water (when in a non-water-passing state), the second valve body 683b descends due to its own weight, separates 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, communicates the second water passage 691b with the outside, and introduces outside air into the second water passage 691b. Thereby, it is prevented that the inside of the second water passage 691b becomes a negative pressure, and backflow of the cleaning water in the second water passage 691b, that is, the rim-side water supply passage 320, is prevented.

[0055] In the vacuum breaker 680, the first valve body 683a and the second valve body 683b move up and down according to the state of the washing water in the first water passage 691a and the second water passage 691b. When washing water is flowing through 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.

[0056] When the first water passage 691a (the water supply passage 330 on the tank side) is in a water passing state, for example, dust may be caught between the first valve body 683a and the lower end of the first protrusion 696a. In such a case, a malfunction of the first valve body 683a may occur, and the first air inlet 690a may not be closed by the first valve body 683a. If the first air inlet 690a cannot be closed, the washing water flows from the first water passage 691a to the first air inlet 690a, and the washing water overflows from the first air inlet 690a to the water receiving portion 686.

[0057] Here, in order to achieve miniaturization (low silhouette) for improving the design of the flushing toilet 100 (see FIG. 1), in the washing water supply device 1 (see FIG. 1), as shown in FIG. 5, in order to ensure a certain vertical distance D1 from the position L0 where the backflow prevention mechanism functions to the water surface (overflow water level L1) of the water receiving portion 686 above the overflow surface L2 to prevent overflow when negative pressure is applied, it is necessary to suppress the vertical distance D2 between the overflow water level L1 and the overflow surface L2.

[0058] Thus, in order to miniaturize the washing water supply device 1, it is necessary to lower the overflow water level L1 together with the position L0 where the backflow prevention mechanism functions. In order to lower the overflow water level L1, it is necessary to suppress the splashing (also referred to as backflow) of the washing water W2 (see FIG. 6) from the inlet 801 of the tank 800.

[0059] In the present embodiment, the tank joint 702 suppresses the splashing of the washing water, and it is possible to lower the overflow water level L1 for miniaturization of the washing water supply device 1.

[0060] <Tank joint> Next, with reference to FIGS. 5 and 6, the tank joint 702 will be described. FIGS. 5 and 6 are schematic side sectional views of the tank joint 702. Note that FIG. 6 shows a state in which the splash of the washing water W1 from the inlet 801 of the tank 800 is suppressed.

[0061] As shown in FIG. 5, a tank joint 702 is disposed between the drain port 687a and the inlet 801 of the tank 800. The drain port 687a discharges the washing water W1 received by the water receiving portion 686. The drain port 687a communicates with the inside of the water receiving portion 686.

[0062] A drain pipe 760 that is continuous with the drain port 687a and extends downward from the bottom surface of the water receiving portion 686 is provided at the drain port 687a. For this reason, the washing water W1 received by the water receiving portion 686 is discharged from the outlet 761 of the drain pipe 760 via the drain port 687a. In a top view, the outlet 761 of the drain pipe 760 is located on the first inclined surface 751a of the washing water guiding means 750 described later.

[0063] The inlet 801 is an opening for introducing the washing water W1 into the inside of the tank 800 that functions as the drain tank for storing the washing water W1 discharged from the drain port 687a. The inlet 801 is formed in the upper part of the tank 800.

[0064] Introducing walls 802 and 822 are provided on the outer peripheral portion of the inlet 801 so as to surround the inlet 801.

[0065] The tank 800 includes a drain introduction portion 810 and an air circulation portion 820. The drain introduction portion 810 introduces the washing water W1 discharged from the drain port 687a into the inside of the tank 800. The air circulation portion 820 is provided separately from the drain introduction portion 810. The air circulation portion 820 circulates air between the inside and the outside of the tank 800 so that the washing water W1 and air are replaced inside the tank 800 when the washing water W1 is supplied to and drained from the tank 800.

[0066] In addition, the above-mentioned "when supplying and discharging cleaning water to the tank 800" includes, for example, supplying water to the tank 800 from the tank-side water supply passage 330 (see FIG. 1), introducing the cleaning water (drainage) of the water receiving portion 686, discharging water from the pump-side water supply passage 340 (see FIG. 1) to the jet discharge port 241 (see FIG. 1), and discharging water from the overflow passage 342 (see FIG. 1) to the jet discharge port 214, etc., but is not limited thereto.

[0067] The drainage introduction portion 810 includes the above-mentioned introduction port 801 and a drainage receiving portion 811.

[0068] The drainage receiving portion 811 is formed on the upper lid portion (not shown) of the tank 800 and receives the cleaning water W1 discharged from the drain port 687a.

[0069] The air circulation portion 820 includes an intake port 821 and a peripheral wall (introduction wall) 822. The intake port 821 is an opening formed at the portion where the drainage receiving portion 811 of the tank 800 is formed, that is, at the bottom surface of the drainage receiving portion 811, and allows air to circulate.

[0070] The introduction wall 822 is formed so as to protrude upward from around the intake port 821. The height of the introduction wall 822 is set to be slightly lower than the height of the wall (introduction wall) 802 of the drainage receiving portion 811, but is not limited thereto. For example, they may be the same. In this way, by setting the heights of the introduction walls 822 and 802 to be approximately the same, it becomes difficult for the cleaning water W1 received by the drainage receiving portion 811 to flow into the air circulation portion 820, and it is possible to suppress the cleaning water W1 from hindering the air circulation.

[0071] In addition, a backflow prevention valve 803, which is a float valve for preventing the backflow of the cleaning water W1, and an intake valve 804, which is also a float valve, are arranged in the tank 800.

[0072] The cleaning water W1 discharged from the drain port 687a is discharged to the introduction port 801 via the tank joint 702.

[0073] Inside the tank joint 702, a washing water guiding means 750 is provided. The washing water guiding means 750 is provided between the drain port 687a and the inlet 801. The washing water guiding means 750 guides the washing water W1 discharged from the drain port 687a to the inlet 801.

[0074] The washing water guiding means 750 has a first inclined surface 751a and a second inclined surface 751b. The first inclined surface 751a is a sloped downward inclined surface, and is an inclined surface such that the washing water W1 discharged from the drain port 687a flows downward.

[0075] The second inclined surface 751b is, like the first inclined surface 751a, a sloped downward inclined surface, and is an inclined surface such that the washing water W1 discharged from the first inclined surface 751a flows downward. The second inclined surface 751b is formed such that the washing water W1 flows in a direction different from that of the first inclined surface 751a. The second inclined surface 751b is inclined downward toward the first inclined surface 751a so as to form a zigzag path together with the first inclined surface in a side view.

[0076] At the most downstream of the second inclined surface 751b, an outlet portion 752 that serves as an outlet of the washing water W1 of the tank joint 702 is provided. The outlet portion 752 is disposed at a position offset from directly above the inlet 801. The washing water guiding means 750 discharges the washing water W1 from a position offset from directly above the inlet 801. Also, the drain port 687a is disposed at a position offset from directly above the inlet 801, like the outlet portion 752.

[0077] Such first inclined surface 751a and second inclined surface 751b have an offset structure with respect to the check valve 803 of the tank 800.

[0078] In such a tank joint 702, the cleaning water W1 discharged from the drain port 687a is discharged to the first inclined surface 751a through the atmosphere-opened space S1. The first inclined surface 751a discharges the cleaning water W1 to the second inclined surface 751b. Also, in the tank joint 702, the cleaning water W1 discharged to the second inclined surface 751b is discharged to the introduction port 801 through the atmosphere-opened space S2. Further, the atmosphere-opened space (open space) S2 is formed between the lid portion 703 and the introduction wall 802.

[0079] The tank joint 702 is arranged such that the back side of the first inclined surface 751a is above the introduction port 801 and at a position higher than the introduction wall 802. The back side of the first inclined surface 751a of the tank joint 702 becomes the lid portion 703 that covers the introduction port 801 in a top view. The lid portion 703 forms a concave portion that protrudes upward above the introduction port 801.

[0080] The lid portion 703 is provided to extend outside the introduction wall 802 in the direction of the intake port 821 arranged on the side of the introduction port 80. Also, the lid portion 703 has an open space S2 in the direction opposite to the direction of the intake port 821.

[0081] And, as shown in FIG. 6, since the lid portion 703 functions as a holding lid for the introduction port 801, it is possible to suppress the splashing of the cleaning water W2.

[0082] According to the cleaning water supply device 1 according to the embodiment, since the cleaning water W1 is discharged from a position deviated from directly above the introduction port 801, it is possible to prevent the cleaning water W2 overflowing from the introduction port 801 from filling the tip of the drain port 687a (the outlet 761 of the drain pipe 760), and it is not possible to suck up the cleaning water W2 by capillary action. Thereby, it is possible to suppress the splashing of the cleaning water W2, and it is possible to lower the overflow water level L1 for miniaturization.

[0083] Also, since the lid portion 703 functions as a holding lid for the introduction port 801, it is possible to further suppress the splashing of the cleaning water W2, and it is possible to lower the overflow water level L1.

[0084] In addition, the rising cleaning water W2 can be discharged from the open space S2. As a result, the upward splash of the cleaning water W2 can be further suppressed, and the overflow water level L1 can be lowered.

[0085] In addition, since the lid portion 703 forms a concave portion above the introduction port 801, the upward splash of the cleaning water W2 can be suppressed at a position as high as possible. Therefore, even if the upward splash of the cleaning water W2 is strong, the overflow due to the upward splash can be further suppressed, and the overflow water level L1 can be lowered.

[0086] In addition, since the lid portion 703 is provided outside the introduction wall 822 in the direction of the intake port 821, it is possible to prevent the cleaning water W2 overflowing from the introduction port 801 from entering the intake port 821. Also, the cleaning water W2 can be discharged from the open space S2 in the direction opposite to the direction of the intake port 821. As a result, the upward splash of the cleaning water W2 can be further suppressed, and the overflow water level L1 can be lowered.

[0087] In the above-described embodiment, a part of the tank joint 702 is provided as the lid portion 703. However, for example, a concave lid portion 703 may be provided separately from the tank joint 702.

[0088] Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various changes can be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and their equivalents.

Description of Reference Numerals

[0089] 1 Cleaning water supply device 200 Toilet body 680 Vacuum cleaner 683 Valve body 683a First valve body 683b Second valve body 685 Water passage part 686 Water receiving part 687a Drain outlet 690a First air inlet (air release opening) 690b Second air inlet (air release opening) 691a First water passage (water passage) 691b Second water passage (water passage) 692a First water inlet (water inlet) 692b Second water inlet (water inlet) 693a First water outlet (water outlet) 693b Second water outlet (water outlet) 703 Cover part 750 Cleaning water guiding means 751a First inclined surface 751b Second inclined surface 800 Tank (drain tank) 801 Inlet 802,822 Inlet wall 821 Air intake S2 Atmosphere-released space (open space) W1 Cleaning water W2 Cleaning water

Claims

1. A tank for storing washing water supplied to a toilet body, a water passage having a water inlet on the upstream side and a water outlet on the downstream side, an air inlet for communicating the water passage with the outside, and a valve body provided inside the water passage and operated by the water pressure of the washing water to communicate the water inlet and the water outlet during water flow and to communicate the water passage and the air inlet during non-water flow, and a water receiving portion for receiving the washing water overflowing from the air inlet, a vacuum breaker; a drain port for discharging the washing water received by the water receiving portion, an inlet for introducing the washing water into the inside of a drain tank for storing the washing water discharged from the drain port, an introduction wall provided on the outer peripheral portion of the inlet so as to surround the inlet and comprising a washing water supply device, wherein the drain port is disposed at a position deviated from the inner peripheral surface of the inlet in a plan view.

2. The washing water supply device according to claim 1, further comprising a lid portion disposed above the inlet and at a position higher than the introduction wall and covering at least the inlet in a top view.

3. The washing water supply device according to claim 2, having an open space between the lid portion and the introduction wall.

4. The washing water supply device according to claim 2 or 3, wherein the lid portion forms a concave portion convex upward above the inlet.

5. An air intake port disposed laterally of the inlet for discharging air from the drain tank, The washing water supply device according to any one of claims 2 to 4, wherein the lid portion is provided up to the outside of the introduction wall in a direction toward the air intake port and has an open space in a direction opposite to the direction toward the air intake port.

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