A flushing water tank device, and a flush toilet device equipped therewith.

Abstract

The present invention provides a cleaning water tank device that can sufficiently suppress the amount of water vapor flowing out from the intake passage. [Solution] The present invention relates to a flushing water tank device (4) for storing flushing water for flushing a toilet, comprising: a flushing water tank body (8) for storing flushing water for flushing a toilet; a lid (8a) provided to cover the water surface of the flushing water stored in the flushing water tank body; and an intake passage (16) extending from a first end (16a) communicating with the outside air to a second end (16b) located inside the flushing water tank body, which draws outside air into the flushing water tank body when the flushing water stored in the flushing water tank body is drained during toilet flushing, wherein the opening of the second end of the intake passage is located below the water surface of the flushing water stored in the flushing water tank body when the toilet is in standby mode.

Description

[[Technical Field]]

[0001] The present invention relates to a flush water tank device, and particularly to a flush water tank device that stores flush water for cleaning a toilet bowl, and a flush toilet device provided with the same. [[Background Art]]

[0002] Japanese Patent Laid-Open No. 2015-68054 (Patent Document 1) describes a toilet device. This toilet device includes a toilet bowl body, a sealed flush water tank that stores flush water for cleaning the toilet bowl body, and a casing that accommodates the flush water tank. Furthermore, this toilet device is configured such that when the flush water in the sealed flush water tank is discharged, the inside of the sealed flush water tank communicates with the space outside the flush water tank inside the casing through an intake pipe that draws in air from the outside. Water vapor generated by evaporation of the flush water in the flush water tank is condensed and discharged in the intake pipe, thereby preventing water vapor from spreading into the casing and adversely affecting electrical equipment and the like inside the casing. [[Prior Art Literature]] [[Patent Literature]]

[0003] [[Patent Document 1]] Japanese Patent Laid-Open No. 2015-68054 [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0004] However, when the amount of water vapor generated in the flush water tank is large, there is a problem that water vapor flowing into the intake passage (intake pipe) cannot be sufficiently condensed within the intake passage. If the water vapor flowing into the intake passage cannot be sufficiently condensed inside the intake passage, and the water vapor flows out from the intake passage to the outside, the water vapor will condense inside the casing or the like, and there is a problem that condensed water adversely affects electrical components and the like arranged inside the casing or the like.

[0005] Therefore, the present invention aims to provide a flushing water tank device that can sufficiently suppress the amount of water vapor flowing out from the intake passage, and a flush toilet device equipped therewith. [Means for solving the problem]

[0006] To solve the above-mentioned problems, the present invention provides a flushing water tank device for storing flushing water for flushing a toilet, comprising: a flushing water tank body for storing flushing water for flushing a toilet; a lid provided to cover the water surface of the flushing water stored in the flushing water tank body; and an intake passage extending from a first end communicating with the outside air to a second end located inside the flushing water tank body, which draws outside air into the flushing water tank body when the flushing water stored in the flushing water tank body is drained during toilet flushing, wherein the opening at the second end of the intake passage is located below the water surface of the flushing water stored in the flushing water tank body when the toilet is in standby mode.

[0007] With the present invention configured in this way, since the opening at the second end of the intake passage is located below the water level of the cleaning water in the cleaning water tank body, the water vapor flowing into the intake passage is limited to the water vapor generated from the water level inside the opening at the second end. Therefore, the amount of water vapor flowing into the intake passage can be significantly reduced compared to the case where water vapor generated from the entire water level of the cleaning water in the cleaning water tank body flows in. As a result, adverse effects on electrical components and the like caused by water vapor flowing out of the intake passage can be sufficiently suppressed.

[0008] In the present invention, preferably, the invention further includes a float switch for detecting the height of the water level of the cleaning water stored in the cleaning water tank body, and a water supply valve for switching the supply of cleaning water to the cleaning water tank body on and off. When the float switch detects that the water level of the cleaning water in the cleaning water tank body has fallen below the opening at the second end of the intake passage, it activates the water supply valve and supplies cleaning water to the cleaning water tank body.

[0009] The water level of the cleaning water stored in the cleaning water tank body decreases due to evaporation of the cleaning water, etc. When the water level of the cleaning water decreases and falls below the opening at the second end of the intake passage, water vapor generated from the entire water surface flows into the intake passage. According to the present invention configured as described above, when the water level in the cleaning water tank body falls below the opening at the second end of the intake passage, cleaning water is supplied into the cleaning water tank body, so that the opening at the second end remains lower than the water level of the cleaning water, and the amount of water vapor flowing into the intake passage can be kept low.

[0010] In the present invention, preferably, the intake passage has a transverse pipe section extending from a first end and a longitudinal pipe section extending from the downstream end of the transverse pipe section to a second end.

[0011] With the present invention configured in this way, water vapor that flows into the longitudinal section of the intake passage from the second end rises and flows into the transverse section, causing the water vapor to condense on the inner wall surface of the transverse section. This further reduces the amount of water vapor flowing out of the intake passage.

[0012] In the present invention, preferably, the horizontal pipe portion of the intake passage is inclined such that its bottom surface becomes lower toward the vertical pipe portion.

[0013] According to the present invention configured in this way, the bottom surface of the horizontal pipe section of the intake passage is sloped downward toward the vertical pipe section. As a result, condensation formed on the inner wall surface of the horizontal pipe section flows down the sloped bottom surface of the horizontal pipe section and returns to the vertical pipe section. This allows the condensation to be returned to the washing water tank body.

[0014] In the present invention, preferably, the transverse pipe portion of the intake passage is configured to be longer than the longitudinal pipe portion.

[0015] According to the present invention configured as described above, since the lateral pipe portion of the intake passage is configured to be longer than the vertical pipe portion, more water vapor that has flowed into the intake passage can be condensed in the lateral pipe portion, and the amount of water vapor flowing out from the intake passage can be further reduced.

[0016] Furthermore, the present invention is a flush toilet device that performs toilet flushing using flush water stored in a flush water tank, characterized by comprising: a flush toilet body provided with a bowl portion and a drain trap pipeline; and the flush water tank device of the present invention that stores flush water for flushing the bowl portion of the flush toilet body. Effects of the Invention

[0017] According to the flush water tank device of the present invention and the flush toilet device provided with the same, the amount of water vapor flowing out from the intake passage can be sufficiently suppressed. Brief Description of the Drawings

[0018] [Figure 1] It is a side cross-sectional view of the flush toilet device according to an embodiment of the present invention. [Figure 2] It is a perspective view of a flush water tank device provided in the flush toilet device according to an embodiment of the present invention. [Figure 3] It is a front cross-sectional view of the flush toilet device according to an embodiment of the present invention. [Figure 4] It is a side cross-sectional view of the flush toilet device according to an embodiment of the present invention. [Figure 5] It is an enlarged cross-sectional view showing a portion of an intake passage provided in the flush toilet device according to an embodiment of the present invention. Mode for Carrying Out the Invention

[0019] Next, with reference to the accompanying drawings, a flush water tank device according to an embodiment of the present invention and a flush toilet device provided with the same will be described. Figure 1 is a side cross-sectional view of the flush toilet device according to an embodiment of the present invention.

[0020] As shown in Fig. 1, a flush toilet device 1 according to an embodiment of the present invention is a siphon-type flush toilet, and includes a ceramic flush toilet body 2, a resin toilet seat and a resin toilet lid (not shown) arranged on the upper surface of the flush toilet body 2, and a flush water tank device 4 arranged at the rear upper part of the flush toilet body 2. The flush water tank device 4 is covered with a resin cover 4a.

[0021] The flush toilet body 2 is formed with a bowl portion 2a for receiving waste, a drain trap pipe 2b provided at the bottom of the bowl portion 2a for discharging waste by siphon action, and a rim water spout 2c for performing rim water spouting. Further, the downstream end of the drain trap pipe 2b is connected to a drain pipe (not shown) via a drain socket (not shown).

[0022] The rim water spout 2c is provided at an upper part of the bowl portion 2a, and discharges flush water. The flush water flows down while swirling along the bowl portion 2a, thereby cleaning the bowl portion 2a.

[0023] Next, with further reference to Fig. 2 to Fig. 5, the flush water tank device 4 provided in the flush toilet device 1 according to the embodiment of the present invention will be described. Fig. 2 is a perspective view of the flush water tank device 4 provided in the flush toilet device 1 of the present embodiment. Fig. 3 is a front cross-sectional view of the flush water tank device 4 of the present embodiment. Fig. 4 is a side cross-sectional view of the flush water tank device 4 of the present embodiment. Fig. 5 is an enlarged cross-sectional view showing a portion of an intake passage provided in the flush water tank device 4 of the present embodiment.

[0024] As shown in Fig. 2, the flush water tank device 4 includes a water supply valve 6 that supplies and stops flush water from a water supply, and a resin flush water tank body 8 that stores flush water supplied via the water supply valve 6. A lid portion 8a is provided so as to cover the water surface of the flush water stored in the flush water tank body 8, and a toilet flushing unit 10 is arranged on the upper side of the lid portion 8a.

[0025] The water supply valve 6 is located on the lower side of the cleaning water tank body 8. This water supply valve 6 is connected to a water source (not shown), such as a water supply system, and is configured to switch the supply of cleaning water to the cleaning water tank body 8 on and off.

[0026] In this embodiment, the flushing water tank body 8 is a resin tank located on the rear upper surface of the flush toilet body 2. The water level of the flushing water stored in the flushing water tank body 8 is covered by a lid 8a provided at the upper end of the flushing water tank body 8. Thus, in this embodiment, the flushing water tank device 4 is a sealed flushing water tank device. Furthermore, the entire flushing water tank device 4 shown in Figure 2 is covered by a resin cover 4a (Figure 1).

[0027] Next, as shown in Figures 3 and 4, a drain valve 12 and a float switch 14 are provided inside the washing water tank body 8. The drain valve 12 is a valve body configured to open and close a drain port 8b located in the center of the width direction of the bottom surface of the flush water tank body 8. The drain valve 12 is configured to open in response to the user's flushing operation, and to discharge the flush water stored in the flush water tank body 8 to the toilet bowl body 2 via the drain port 8b. The flush water discharged from the flush water tank body 8 to the toilet bowl body 2 is discharged from the rim outlet 2c through a water conduit provided in the toilet bowl body 2.

[0028] Furthermore, the drain valve 12 is a linear valve body that moves vertically, and has a disc-shaped valve body portion 12a provided at its lower end, and an overflow pipe portion 12b extending upward from the center of the valve body portion 12a. The valve body portion 12a is seated on a drain port 8b provided on the bottom surface of the washing water tank body 8 and is configured to close the drain port 8b.

[0029] The overflow pipe section 12b is a circular pipe extending vertically upward from the valve body section 12a. This overflow pipe section 12b connects the space below the valve body section 12a with the space above the water level of the flushing water stored in the flushing water tank body 8. Therefore, when the water level of the flushing water in the flushing water tank body 8 rises above the height of the upper end of the overflow pipe section 12b, the flushing water is discharged through the overflow pipe section 12b to the toilet flushing bowl body 2, even when the valve body section 12a is closed.

[0030] Furthermore, the drain valve 12 is lifted up from the drain port 8b by a toilet flushing motor (not shown) provided in the toilet flushing unit 10 located on the upper side of the lid 8a of the flushing water tank body 8, thereby opening the drain port 8b. In other words, the drain valve 12 is configured to be lifted upward by a ball chain 10a extending downward from the toilet flushing unit 10. The toilet flushing unit 10 is configured to lift the drain valve 12 at a predetermined timing based on a control signal from a controller (not shown) when flushing the toilet.

[0031] The float switch 14 is provided so as to hang down from the lower surface of the lid 8a of the cleaning water tank body 8 (Figure 4), and is configured to detect the height of the water level of the cleaning water stored in the cleaning water tank body 8. Specifically, the float switch 14 is configured to detect when the water level in the cleaning water tank body 8 has reached a predetermined storage water level and when it has fallen below a predetermined supply water level, and to send a detection signal to a controller (not shown).

[0032] When the controller (not shown) detects via the float switch 14 that the water level in the cleaning water tank body 8 has fallen below a predetermined water supply level, it sends a control signal to the water supply valve 6 to open the water supply valve 6. As a result, cleaning water is supplied to the cleaning water tank body 8 from a water source such as a tap connected to the water supply valve 6 through the water supply valve 6. Furthermore, when the controller (not shown) detects via the float switch 14 that the water level in the cleaning water tank body 8 has reached a predetermined water storage level, it sends a control signal to the water supply valve 6 to close the water supply valve 6. As a result, the supply of cleaning water from a water source such as a tap to the cleaning water tank body 8 is stopped.

[0033] In the flushing water tank device 4 of this embodiment, when the toilet is flushed, the flushing water in the flushing water tank body 8 is discharged, and flushing water is supplied when the water level in the flushing water tank body 8 drops. Furthermore, even when the flushing is in standby mode, if the water level in the flushing water tank body 8 drops below a predetermined water supply level due to evaporation or the like, flushing water is supplied to the flushing water tank body 8.

[0034] Next, with reference to Figure 5, the structure of the intake passage of the cleaning water tank device 4 will be described. As shown in Figure 5, in this embodiment, the intake passage 16 is a passage integrally formed with the lid 8a on the upper side of the lid 8a of the flushing water tank body 8, and is configured to draw outside air into the flushing water tank body 8 when the flushing water stored in the flushing water tank body 8 is drained during toilet flushing. That is, the flushing water tank device 4 of this embodiment has a sealed structure in which the upper end of the flushing water tank body 8 is covered by the lid 8a. Therefore, when the flushing water in the flushing water tank body 8 is drained during toilet flushing, the pressure inside the flushing water tank body 8 decreases, and outside air is drawn in through the intake passage 16.

[0035] The intake passage 16 is a passage that extends through the lid 8a from a first end 16a that communicates with the outside air to a second end 16b located inside the flush water tank body 8. The first end 16a is located on the upper side of the lid 8a of the flush water tank body 8 and opens to the side. On the other hand, the second end 16b is located inside the flush water tank body 8 below the lid 8a and opens downward. Furthermore, the cross-sectional area of ​​the intake passage 16 is configured to be large enough to draw in outside air into the flush water tank body 8 at a sufficient flow rate when flushing the toilet.

[0036] The cleaning water tank body 8 is entirely covered by the resin cover 4a (Figure 1) of the cleaning water tank device 4, and the first end 16a of the intake passage 16 is also located inside the cover 4a. However, since the cover 4a is not sealed, the inside of the cover 4a is in communication with the outside air, and the first end 16a is also in communication with the outside air.

[0037] Furthermore, the intake passage 16 is composed of a horizontal pipe section 18 extending generally horizontally from the first end 16a and a vertical pipe section 20 extending generally vertically from the downstream end of the horizontal pipe section 18 to the second end 16b, and as a whole it extends in a roughly L-shape. That is, the horizontal pipe section 18 of the intake passage 16 extends roughly horizontally from the first end 16a, which is located at the side end of the washing water tank body 8, towards the center, above the lid 8a. The vertical pipe section 20 extends generally vertically downward from the end of the horizontal pipe section 18 on the side opposite to the first end 16a, below the lid 8a. At the upper end of the vertical pipe section 20, an opening is provided in the lid 8a, and the horizontal pipe section 18 and the vertical pipe section 20 are in communication through this opening. Thus, in this embodiment, the intake passage 16 extends through the lid portion 8a of the cleaning water tank body 8. Furthermore, the vertical pipe portion 20 has a circular cross-section, and the opening at its lower end (second end portion 16b) is circular and oriented almost horizontally.

[0038] Furthermore, as shown in Figure 5, the opening of the second end 16b at the lower end of the vertical pipe section 20 is located below the water level W of the flushing water stored in the flushing water tank body 8 when the toilet is in standby mode. That is, the second end 16b (the lower end of the vertical pipe section 20) is submerged in the flushing water in the flushing water tank body 8 when in standby mode. Therefore, although water vapor evaporated from the water level W1 inside the vertical pipe section 20, which is surrounded by the walls of the vertical pipe section 20, flows into the intake passage 16, water vapor evaporated from the water level W outside the vertical pipe section 20 cannot enter the intake passage 16. Consequently, only water vapor evaporated from a very small portion of the water level W1 in the flushing water tank body 8 flows into the intake passage 16. As a result, the amount of water vapor flowing into the intake passage 16 can be significantly reduced.

[0039] Furthermore, as shown in Figure 5, in this embodiment, the length of the horizontal pipe section 18, which extends substantially horizontally, is longer than the length of the vertical pipe section 20, which extends substantially vertically. As a result, water vapor rising in the vertical pipe section 20 is cooled by the inner wall surface of the horizontal pipe section 18 as it flows through the long horizontal pipe section 18, and condensation occurs on the inner wall surface of the horizontal pipe section 18. This reduces the amount of water vapor flowing out from the first end 16a of the horizontal pipe section 18.

[0040] Furthermore, the bottom surface 18a of the horizontal pipe section 18 is sloped downwards toward the vertical pipe section 20. That is, the bottom surface 18a of the horizontal pipe section 18 is highest at the first end 16a and lowest at the other end connected to the vertical pipe section 20. As a result, water vapor condenses on the inner wall surface of the horizontal pipe section 18, and the water droplets that fall onto the bottom surface 18a flow toward the lower vertical pipe section 20, passing through the vertical pipe section 20 and returning to the cleaning water tank body 8. In this way, because the bottom surface 18a of the horizontal pipe section 18 is sloped downwards toward the vertical pipe section 20, the condensed water vapor can be returned to the cleaning water tank body 8, and the condensed water can be processed without flowing out to the outside.

[0041] Next, the operation of the flush toilet device 1 according to an embodiment of the present invention will be described. First, when the user operates the toilet flushing switch (not shown) while the flush toilet unit 1 is in standby mode, a flushing instruction signal is sent to the controller (not shown). Upon receiving the flushing instruction signal, the controller sends a control signal to the toilet flushing unit 10, which activates the motor (not shown) of the toilet flushing unit 10. This causes the ball chain 10a (Figure 3) connected to the drain valve 12 to be pulled up, and the drain valve 12 moves away from the drain port 8b of the flush water tank body 8. As a result, the flushing water in the flush water tank body 8 is discharged from the drain port 8b by gravity and flows into the flush toilet body 2.

[0042] The flushing water that flows into the toilet bowl body 2 passes through a water conduit formed inside the toilet bowl body 2 and is discharged from the rim outlet 2c of the toilet bowl body 2. The flushing water discharged from the rim outlet 2c forms a swirling flow in the bowl section 2a, cleaning the bowl section 2a. The flushing water that flows into the bowl section 2a induces a siphon effect in the drain trap pipe 2b, and the flushing water and waste in the bowl section 2a are discharged through the drain trap pipe 2b. At the same time, the flushing water in the flushing water tank body 8 is discharged, while outside air is drawn into the flushing water tank body 8 through the intake passage 16. The flow resistance of this intake passage 16 is sufficiently small, allowing outside air to be drawn into the flushing water tank body 8 at a sufficient flow rate.

[0043] After the cleaning water is discharged, the drain valve 12 re-seats onto the drain port 8b of the cleaning water tank body 8, and the drain valve 12 is closed again. Furthermore, as the cleaning water is discharged, the water level of the cleaning water in the cleaning water tank body 8 falls below a predetermined water supply level. A float switch 14 (Figure 4) located inside the cleaning water tank body 8 detects this, and the detection signal is sent to a controller (not shown). Next, the controller sends a control signal to the water supply valve 6, causing it to open. As a result, the cleaning water supplied from the water supply passes through the water supply valve 6 and is supplied into the cleaning water tank body 8.

[0044] When flushing water is supplied to the flushing water tank body 8 via the water supply valve 6, the water level in the flushing water tank body 8 rises. When the water level in the flushing water tank body 8 rises to a predetermined level, the float switch 14 (Figure 4) located inside the flushing water tank body 8 detects this and sends a detection signal to the controller (not shown). The controller then sends a control signal to the water supply valve 6 to close it. As a result, the water level of the flushing water stored in the flushing water tank body 8 rises to a predetermined water level, the supply of flushing water by the water supply valve 6 stops, and one toilet flush is completed. With the above steps, the flushing toilet device 1 returns to the toilet flushing standby state.

[0045] Furthermore, when the toilet is in standby mode and the flushing water stored in the flushing water tank body 8 is at a predetermined water level, the opening of the second end 16b of the intake passage 16 is located below the water level of the flushing water stored in the flushing water tank body 8. That is, the lower end of the vertical pipe section 20 of the intake passage 16 is submerged in the flushing water.

[0046] In this embodiment, the lower end (second end 16b) of the vertical pipe section 20 of the intake passage 16 is located approximately 1 mm below the water level in the reservoir. Preferably, the intake passage 16 is configured such that the opening of the second end 16b is located approximately 1 mm to approximately 20 mm below the water level in the reservoir. As a result, when the drainage of the cleaning water from the cleaning water tank body 8 begins, the second end 16b of the intake passage 16 quickly moves above the water level in the cleaning water. Consequently, the lower end of the vertical pipe section 20 being submerged does not substantially obstruct the intake of outside air into the cleaning water tank body 8, and does not substantially adversely affect the discharge of the cleaning water.

[0047] Furthermore, when the flush toilet device 1 is in standby mode, some of the flushing water stored in the flushing water tank body 8 evaporates and turns into water vapor, which flows out through the intake passage 16 along with the air inside the flushing water tank body 8. In particular, when the temperature of the stored flushing water is relatively high, a large amount of the flushing water evaporates and turns into water vapor. And when the outside temperature outside the flushing water tank body 8 is relatively low, the generated water vapor is likely to condense.

[0048] However, since the second end 16b of the intake passage 16 is lower than the water level of the flushing water, when the flush toilet device 1 is in standby mode, the water vapor flowing into the intake passage 16 is limited to that which evaporates from the water level W1 (Figure 5) inside the intake passage 16 (vertical pipe section 20). Therefore, the amount of water vapor flowing into the intake passage 16 can be significantly reduced. In addition, the water vapor that flows into the intake passage 16 and rises from the vertical pipe section 20 to the horizontal pipe section 18 is cooled and condenses upon contact with the inner wall surface of the horizontal pipe section 18.

[0049] Condensed water that forms on the inner wall surface of the horizontal pipe section 18 flows down to the bottom surface 18a of the horizontal pipe section 18, flows along the inclined bottom surface 18a and returns to the vertical pipe section 20. The water droplets that return to the vertical pipe section 20 fall into the cleaning water tank body 8. This reduces the amount of water vapor that flows out from the first end 16a of the intake passage 16 into the outside air (inside the cover 4a (Figure 1)), thereby suppressing adverse effects on electrical components and other items located inside the cover 4a.

[0050] Furthermore, while the flush toilet device 1 is in standby mode, if the flush water stored in the flush water tank body 8 evaporates, the water level in the flush water tank body 8 will decrease. In this embodiment, even while the flush toilet device 1 is in standby mode, if the water level of the flush water stored in the flush water tank body 8 falls below a predetermined water supply level, the float switch 14 detects this and sends a detection signal to the controller (not shown). Based on this detection signal, the controller sends a control signal to the water supply valve 6, causing the water supply valve 6 to open. As a result, flush water is replenished in the flush water tank body 8. When the water level in the flush water tank body 8 rises to a predetermined water level due to the water supply, the water supply of flush water by the water supply valve 6 is stopped.

[0051] In this embodiment, the water level at which replenishment of cleaning water into the cleaning water tank body 8 begins during standby is set lower than the height of the opening at the second end 16b of the intake passage 16. Therefore, when the float switch 14 detects that the water level of the cleaning water in the cleaning water tank body 8 has fallen below the opening at the second end 16b of the intake passage 16, it activates the water supply valve 6 to supply cleaning water into the cleaning water tank body 8. As a result, the opening at the second end 16b of the intake passage 16 is kept submerged in the cleaning water stored in the cleaning water tank body 8, and the amount of water vapor flowing into the intake passage 16 can be reduced.

[0052] According to the cleaning water tank device 4 of the embodiment of the present invention, the opening of the second end 16b of the intake passage 16 is located below the water surface W of the cleaning water in the cleaning water tank body 8 (Figure 5). Therefore, the water vapor flowing into the intake passage 16 is limited to the water vapor generated from the water surface W1 inside the opening of the second end 16b. As a result, the amount of water vapor flowing into the intake passage 16 can be significantly reduced compared to the case where water vapor generated from the entire water surface of the cleaning water in the cleaning water tank body 8 flows in. As a result, adverse effects on electrical components and the like due to water vapor flowing out from the intake passage 16 can be sufficiently suppressed.

[0053] Furthermore, according to the cleaning water tank device 4 of the embodiment of the present invention, when the water level in the cleaning water tank body 8 falls below the opening of the second end 16b of the intake passage 16, cleaning water is supplied into the cleaning water tank body 8. This maintains a state where the opening of the second end 16b is lower than the water level W of the cleaning water, and the amount of water vapor flowing into the intake passage 16 can be kept low.

[0054] Furthermore, according to the cleaning water tank device 4 of the embodiment of the present invention, water vapor that flows into the vertical pipe section 20 of the intake passage 16 from the second end 16b rises and flows into the horizontal pipe section 18, so that the water vapor can be condensed on the inner wall surface of the horizontal pipe section 18. This further reduces the amount of water vapor flowing out from the intake passage 16.

[0055] Furthermore, according to the cleaning water tank device 4 of the embodiment of the present invention, the bottom surface 18a of the horizontal pipe section 18 of the intake passage 16 is inclined to become lower toward the vertical pipe section 20. As a result, condensed water that forms on the inner wall surface of the horizontal pipe section 18 flows down the inclined bottom surface 18a of the horizontal pipe section 18 and returns to the vertical pipe section 20. In this way, the condensed water can be returned to the cleaning water tank body 8.

[0056] Furthermore, according to the cleaning water tank device 4 of the embodiment of the present invention, since the horizontal pipe section 18 of the intake passage 16 is configured to be longer than the vertical pipe section 20, more water vapor that flows into the intake passage 16 can be condensed in the horizontal pipe section 18, and the amount of water vapor flowing out of the intake passage 16 can be further reduced.

[0057] The above describes a flushing water tank device and a flush toilet device equipped therewith according to embodiments of the present invention, but various modifications can be made to the above-described embodiments. In particular, in the above-described embodiments, the flushing water stored in the flushing water tank body was discharged by gravity and discharged from the rim outlet of the flush toilet body, but the present invention can also be applied to flushing water tank devices and flush toilet devices of other flushing methods. [Explanation of symbols]

[0058] 1 Flush toilet device 2 Flush toilet body 2a Bowl section 2b Drain trap pipe 2c Rim spout 4. Washing water tank device 4a Cover 6. Water supply valve 8. Washing water tank body 8a Lid 8b Drain port 10 Toilet flushing unit 10a ball chain 12 Drain valve 12a Valve body 12b Overflow pipe section 14. Float switch 16 Intake passage 16a First end 16b Second end 18 Lateral pipe section 18a Base 20 Vertical pipe section

Claims

1. A flushing water tank device for storing flushing water for flushing a toilet bowl, A flushing water tank body that stores flushing water for toilet bowl flushing, A lid is provided to cover the surface of the cleaning water stored inside the cleaning water tank body, An intake passage extends from a first end that communicates with the outside air to a second end located inside the flushing water tank body, and when the flushing water stored in the flushing water tank body is drained during toilet flushing, outside air is drawn into the flushing water tank body. It has, A flushing water tank device characterized in that the opening at the second end of the above-mentioned intake passage is located below the water level of the flushing water stored in the flushing water tank body when the toilet is in standby mode.

2. Furthermore, it includes a float switch for detecting the water level of the cleaning water stored in the cleaning water tank body, and a water supply valve for switching the supply of cleaning water to the cleaning water tank body on and off. The cleaning water tank device according to claim 1, wherein the float switch detects that the water level of the cleaning water in the cleaning water tank body has fallen below the opening at the second end of the intake passage, and activates the water supply valve to supply cleaning water into the cleaning water tank body.

3. The cleaning water tank device according to claim 1, wherein the intake passage comprises a horizontal pipe section extending from the first end and a vertical pipe section extending from the downstream end of the horizontal pipe section to the second end.

4. The washing water tank device according to claim 3, wherein the horizontal pipe portion of the intake passage is inclined such that its bottom surface becomes lower toward the vertical pipe portion.

5. The washing water tank device according to claim 3, wherein the horizontal pipe portion of the intake passage is configured to be longer than the vertical pipe portion.

6. A flush toilet system that uses flushing water stored in a flushing water tank to flush the toilet bowl, A flush toilet body equipped with a bowl and a drain trap pipe, A flushing water tank device according to any one of claims 1 to 5, which stores flushing water for cleaning the bowl portion of the toilet body, A flush toilet device characterized by having the following features.

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