JP6332828B2 - Washing water tank apparatus and flush toilet equipped with the same - Google Patents

Description

  The present invention relates to a washing water tank apparatus for storing washing water for washing a flush toilet.

  Patent Document 1 discloses a flush water tank apparatus that stores flush water for washing a toilet and has a drain port formed at the bottom of the reservoir tank and a drain valve that opens and closes the drain port to supply flush water. There is a disclosure. This washing water tank apparatus has a cylindrical body provided so as to surround a drain outlet at the bottom of the water storage tank, and an opening is formed above the side surface of the cylindrical body. A valve body capable of opening and closing the opening is provided on the side surface, and in the case of large cleaning, a large amount of cleaning water is supplied by opening the valve body and leaving the opening of the cylindrical body open. On the other hand, at the time of small cleaning, the supply of cleaning water is reduced by closing the valve body and keeping the opening of the cylindrical body closed. Further, when the amount of water is smaller than that of the small washing, the cylindrical valve body is completely closed and the outer valve body is opened with a time difference, so that the washing can be performed with a lower amount of water than the small washing. By opening and closing the valve body, the three-stage washing with a smaller amount of washing water than the large washing, the small washing and the small washing is switched. A washing water tank apparatus including a drainage device configured as described above is known. In this washing water tank apparatus, in order to maintain the momentum of water until drainage is completed, the dead water level (water level in the tank immediately after the drainage valve is closed) is positioned vertically above the opening.

JP 2011-241554 A

  However, in such a flush water tank device, since the momentum of water is strong until drainage is completed, the drain valve is drawn into the drain port, and the drain valve closes earlier than the target timing, so that the flush toilet can be washed. However, there has been a problem that a predetermined amount of washing water cannot be supplied. Furthermore, in recent years, there has been a demand for water saving for washing water from the viewpoint of environmental load, and the flush toilet must be washed with a small amount of washing water. In order to achieve both water saving and toilet flushing, it is extremely important to ensure that the water level at the start of toilet flushing is sufficiently high and to supply the required minimum flushing water accurately to the flush toilet in order to ensure head pressure. is important.

  The force with which the drain valve is drawn varies based on the flow rate of the wash water supplied from the water storage tank to the toilet. The flow rate varies depending on the shape of the drainage channel of the toilet, and the shape of the drainage channel depends on the type of toilet. Different. That is, the force with which the drain valve is drawn varies depending on the type of toilet. Therefore, if the same wash water tank device is used for different types of toilets, the amount of wash water varies for each type of toilet, and the amount of wash water supplied is less than the predetermined wash water amount, resulting in poor washing, In some cases, the amount of cleaning water supplied is more than the predetermined amount of cleaning water, so that the demand for water saving cannot be fully met.

  This invention is made | formed in view of the said situation, The objective is to provide the washing water tank apparatus which can supply a predetermined | prescribed amount of washing water reliably from a water storage tank to a toilet bowl.

One aspect of the present invention is a washing water tank device for storing washing water for washing a flush toilet, wherein the washing water is stored and a drainage port is formed on a bottom surface, and the drainage port is opened and closed. a drain valve to supply the washing water to the flush toilet bowl and having a side surface extending vertically upward from the bottom of the water storage tank so as to surround the drain outlet, the side surface with the upper is opened A cylinder body having an opening, a switching valve that opens and closes the opening, a control cylinder disposed inward of the cylinder, and disposed in the control cylinder and descending to the drain valve A float that closes the drain, and a descent operation control means that is provided in the control cylinder and controls a descent operation of the float, and the opening is a side surface of the cylinder and an intermediate position in the vertical direction positioned above, the switching valve is the opening The drain valve closes the drain port when the predetermined amount of flush water is supplied to the flush toilet from the opening through the drain port, and thereby the drain valve closes the drain port. The washing water tank apparatus is characterized in that the water level on the outside of the cylindrical body immediately after the positioning is located between the upper end and the lower end of the opening.

In the invention thus configured, the outer water level of the cylinder immediately after closing the drainage port with the drainage valve is located between the upper end and the lower end of the opening. The flow rate of cleaning water is less than that of inflow. That is, the water cross-sectional area from the opening to the opening flowing into the cylinder gradually decreases at the end of drainage than when the water level in the water storage tank drops to near the upper edge of the cylinder. As a result, the momentum of water is weakened. Therefore, immediately before the drainage is completed, the momentum of the water is weakened, the force for drawing the drainage valve is weakened, and the drainage valve is closed at the target timing, so that the washing water can be supplied to the toilet without a predetermined amount.
Further, by positioning the opening above the intermediate position of the cylinder, the head pressure can be secured while the target drain valve closing water level can be set in the middle of the opening, approaching the target drain valve closing water level. As a result, the cross-sectional area of water with respect to the opening flowing into the cylinder from the opening can be gradually reduced, and the momentum of water is weakened.

  In a selective aspect of the present invention, a wash-off type flush toilet that performs toilet flushing by washing away filth by flowing water caused by a drop of washing water includes the above-described flush water tank device.

  In the present invention configured as described above, the washing water tank apparatus is used in a flushing flush toilet that performs toilet flushing by flushing filth by flowing water due to a drop of washing water, thereby providing a predetermined washing water amount. It is possible to provide a particularly advantageous effect to a flush toilet bowl that is required to be washed for a long time.

  According to the cleaning water tank apparatus of the present invention, a predetermined amount of cleaning water can be reliably supplied from the water storage tank to the toilet.

1 is a front sectional view showing a schematic structure of a cleaning water tank apparatus according to an embodiment of the present invention. 1 is a front sectional view showing a schematic structure of a cleaning water tank apparatus according to an embodiment of the present invention. The disassembled perspective view of the drainage device of the washing water tank device by the embodiment of the present invention. The perspective view of the control cylinder of the drainage device of the washing water tank device by the embodiment of the present invention. Sectional drawing of the drainage apparatus of the washing water tank apparatus by embodiment of this invention. The schematic sectional drawing which shows the state immediately after the drainage start in the large washing mode of the drainage device of the washing water tank device by the embodiment of the present invention. The schematic sectional drawing which shows the state in the middle of the waste_water | drain in the large washing mode of the drainage device of the washing water tank apparatus by embodiment of this invention. The schematic sectional drawing which shows the state after completion | finish of drainage in the large washing mode of the drainage device of the washing water tank apparatus by embodiment of this invention.

  Next, a cleaning water tank apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings. First, a flush toilet to which a flush water tank apparatus according to an embodiment of the present invention is applied will be described with reference to FIG.

  As shown in FIG. 1, reference numeral 1 denotes a flushing flush toilet that performs toilet flushing by flushing filth by flowing water due to a drop in flushing water. The flush flush toilet 1 includes a toilet body 2. The toilet body 2 is formed with a bowl portion 4, a water conduit 6, and a drain trap conduit 8 communicating with the lower portion of the bowl portion 4. On the upper edge of the bowl portion 4 of the toilet body 2, there are formed a rim 10 overhanging on the inside and a first water discharge port 12 for discharging the wash water supplied from the water conduit 6. The wash water discharged from the water descends while swirling to wash the bowl portion 4.

  In the inner bottom portion of the bowl portion 4, a water storage portion 14 is formed in which water at a substantially constant water level is stored. In FIG. 1, the storage surface W0 that is the water surface of the stored water in the reservoir 14 is indicated by a one-dot chain line. Below the water reservoir 14, an inlet 8a of the drain trap pipe 8 opens, and an ascending path 8b extends rearward from the inlet 8a. A descending path 8c continues to the ascending path 8b, and a lower end of the descending path 8c is connected to a discharge pipe (not shown) under the floor via a drain socket (not shown). Further, a second water discharge port 16 for discharging the cleaning water supplied from the water conduit 6 is formed above the storage surface W0 of the bowl portion 4, and the cleaning water discharged from the second water discharge port 16 is stored in the second water discharge port 16. A swirling flow that swirls the water stored in the water section 14 in the vertical direction is generated.

  Above the water conduit 6 of the toilet body 2, a cleaning water tank device 18 that stores cleaning water supplied to the toilet body 2 is provided. As will be described later, a drain port 22 a communicating with the water conduit 6 of the toilet body 2 is formed at the bottom of the water storage tank 22 of the cleaning water tank device 18, and the cleaning water in the water storage tank 22 drains into the water conduit 6. It has come to be.

  Next, a schematic configuration of the cleaning water tank apparatus 18 will be described with reference to FIG. In addition, the flush water tank apparatus 18 of this embodiment is applicable also to other types of flush toilets (for example, siphon flush toilet etc.) other than the wash-off type mentioned above.

  As shown in FIG. 2, the cleaning water tank device 18 includes a ceramic exterior tank 20, a water storage tank 22 that is disposed inside the ceramic tank 20 and stores cleaning water, and a lid 24 that is placed on the exterior tank 20. It is equipped with.

  The water storage tank 22 is provided with a heat insulator 26 so as to surround the water tank 22, and the water tank 22 is attached to the exterior tank 20 by a predetermined engagement member 28 via the heat insulator 26. In addition, a drain port 22 a that communicates with the water conduit 6 of the toilet main body 2 described above is formed on the bottom surface of the water storage tank 22. A drain port member 22b extending to the side surface of the drain port 22a is fixed to the exterior tank 20 by a predetermined engaging member 30, and the water storage tank 22 is attached to the exterior tank 20 through the drain port member 22b.

  Further, the lid body 24 is provided with a hand-washing currant 32 for discharging water for hand-washing into a hand-washing bowl 24 a formed on the lid body 24. The water in the hand-washing basin 24a discharged from the hand-washing currant 32 flows into the water storage tank 22 through a water discharge port (inlet) 24b formed in the hand-washing basin 24a. Below the lid body 24, there is provided a water guide member 25 that guides water flowing from the water discharge port 24 b to the outside of a control cylinder 78 of the drainage device 70 described later.

  Next, the cleaning water tank device 18 includes a cleaning water supply device 34. This washing water supply device 34 is the same as the conventional one, and communicates with a water supply pipe 36 connected to an external water supply source (not shown) such as a water pipe, a water supply device float 38, and a water supply pipe 36. The water storage tank 22 includes a water discharge pipe 40 for discharging cleaning water, a water supply valve 44 connected to the water supply apparatus float 38 via a lever 42, and the like.

  In the present embodiment, the cleaning water supply device 34 starts water supply when drainage is started. In this embodiment, the water stop water level when the water storage tank 22 is full is made constant at the position (WL) shown in FIG.

  Further, the washing water supply device 34 includes a hand washing water supply pipe 31 for supplying water to the hand washing caran 32. When the supply of the washing water to the toilet bowl is started (at the start of drainage), the hand washing caran 32 of the lid 24 described above is provided. The water supply is started.

  Next, the washing water tank device 18 includes an operating device 46 and a drain device 70 that is activated by the operation of the operating device 46.

  First, the operation device 46 will be described. The operation device 46 includes an operation lever 48, a motor 50, and an operation button 52 connected to the motor 50. The operation button 52 includes two operation buttons for large washing and small washing described later.

  When the operation lever 48 is rotated (90 degrees) to one side (front side in this embodiment), large cleaning described later is started, and is rotated (90 degrees) to the other side (back side in this embodiment). If it does, it will be the manual operation lever 48 which operates the drainage device 70 so that the small washing in which the amount of washing water is smaller than the large washing is started. When the large washing button is pressed, the motor 50 rotates in the same direction (front side) as the operation lever 48. When the small washing button is pressed, the motor 50 rotates the other side (back). The drainage device 70 is operated so as to start large washing or small washing. As described above, in this embodiment, the user may operate the operation lever 48 or press the operation button 52 in order to perform large cleaning and small cleaning.

  The operation lever 48 and the motor 50 are connected to one end side of a shaft-shaped rotation transmission member 54 constituted by a wire member, a universal joint, or the like. A first lifting member 56 and a second lifting member 58 that swing about the rotation transmitting member 54 are attached to the other end side of the rotation transmitting member 54 as the rotation is transmitted. An upper end portion of the first ball chain 60 and an upper end portion of the second ball chain 62 are attached to the tip portions of the first lifting member 56 and the second lifting member 58, respectively.

  When the rotation transmitting member 54 is rotated to one side (at the time of large cleaning), only the first lifting member 56 swings to the one side. When only the first ball chain 60 is pulled up and the rotation transmission member 54 is rotated to the other side (at the time of small washing), both the first lifting member 56 and the second lifting member 58 are moved to the other side. It is a mechanical mechanism that swings and pulls up both the first ball chain 60 and the second ball chain 62.

  Next, the drainage device 70 will be described with reference to FIGS. First, as shown in FIG. 3, the drainage device 70 of the cleaning water tank device 18 according to the present embodiment includes a valve body 72, an overflow pipe 74, a cylinder body 76, a control cylinder 78, a float 80, and an overflow pipe. And a switching member 84 (90, 92) for opening and closing an opening 76c described later formed in the cylinder 76.

  First, the drain valve mechanism provided in the drain device 70 will be described with reference to FIGS. First, as shown in FIGS. 2 and 5, the valve body 72 has a bowl shape by being fitted into a U-shaped valve body holding portion 74 a formed at the lower end of the overflow pipe 74. At the same time, it functions as a drain valve that moves up and down to open and close the drain port 22a to supply flush water to the flush toilet 1. Further, a recess 74b for holding the fixing member 82 is formed on the side surface of the overflow pipe 74 so as to extend over the entire middle portion in the vertical direction.

  Next, as shown in FIGS. 4 and 5, the control cylinder 78 is formed with a substantially cylindrical outer wall 78 a and a cylindrical inner wall 78 b that serves to guide the vertical movement of the overflow pipe 74. Has been. Further, as shown in FIG. 5, the control cylinder 78 is formed with an intermediate horizontal wall 78c that allows the washing water to be stored together with the side walls 78a and 78b, and the side wall 78a and 78b and the intermediate horizontal wall 78c store water. A cylinder (water reservoir) 78d is formed.

  The outer wall 78a of the water storage cylinder 78d is formed with two small holes 78e and 78f which are descending operation control means for causing the cleaning water stored in the water storage cylinder 78d to flow out at a predetermined flow rate. One small hole 78e can be opened and closed by sliding a slide member (switching member) 86, and the flow rate of the washing water flowing out from the water storage cylinder 78d can be adjusted. The lowering operation of the drain valve is controlled by adjusting the flow rate of the washing water flowing out of the water storage cylinder 78d by the two small holes 78e and 78.

  Further, the outer wall 78a of the control cylinder 78 is formed with an inlet 78g below the above-described water storage cylinder 78d for allowing the cleaning water on the outer side of the control cylinder 78 to flow into the drain port 22a during drainage. ing.

  Next, as shown in FIG. 5, the float 80 is disposed inside the water storage cylinder 78 d described above. The float 80 is a member having a cylindrical outer shape that causes the buoyancy obtained by the washing water in the water storage cylinder 78d to act on the overflow pipe 74 via the fixing member 82. Above the float 80, a fixing member 82 having a predetermined function is fitted from the side into the recess 74b of the overflow pipe 74 described above so that it can rotate horizontally with respect to the overflow pipe 74. In addition, it is attached to the overflow pipe 74 so that it cannot move in the vertical direction with respect to the overflow pipe 74.

  A lower end portion of the first ball chain 60 attached to the first lifting member 56 described above is attached to the fixing member 82, and the fixing member 82 is used for lifting the overflow pipe 74 during drainage. . When the user rotates the operating lever 48 or when the washing button is pressed and the motor 50 is activated, the first chain 60 is pulled up. At this time, the valve body 72 of the overflow pipe 74 is stored in the water storage tank. 22, the fixing member 82 first rotates in the horizontal direction with respect to the overflow pipe 74, and then the overflow pipe 74 moves vertically upward. Will move. With such a configuration, the overflow pipe 74 can be prevented from moving upward in the vertical direction while rotating, and the valve opening operation of the drainage device 70 can be stabilized.

  Next, the fixing member 82 has a function as a stopper that suppresses the rise of the float 80 when the water is full. During drainage, the overflow pipe 74 and the valve body 72 are interlocked with the lowering of the float 80 as described later. It has a function of connecting the overflow pipe 74 and the float 80 so as to descend. The fixing member 82 is formed in a shape and a size so as to sufficiently contact the upper surface of the float 80 so as to have these functions. Here, the buoyancy of the float 80 is set to a buoyancy that does not raise the overflow pipe 74 and the valve body 72 due to the water pressure applied to the valve body 72 when the water is full, and the downward direction applied to the overflow pipe 74 and the valve body 72 when draining. The buoyancy is set to be slightly larger than Note that the float 80 and the overflow pipe 74 may be fixed to each other and always connected.

  Next, a flow rate adjusting mechanism including the cylinder 76 and the switching valve 84 will be described with reference to FIGS. First, as shown in FIGS. 3 and 5, the cylindrical body 76 has a substantially rectangular cross-sectional shape, has an upper edge portion 76a on four sides, and is open upward. The cylindrical body 76 is provided in a state of being erected on the bottom surface of the water storage tank 22. The side surface of the cylindrical body 76 provided on the bottom surface of the water storage tank 22 extends from the bottom surface of the water storage tank 22 in the vertical direction so as to surround the drain port 22a. Further, the cylindrical body 76 has only one opening 76c formed on only one side surface 76b among the four side surfaces of the cylindrical body 76 formed in a rectangular shape. The opening 76c is formed in a rectangular shape. The lower end 76e of the opening 76c is located above the intermediate position of the side surface 76b of the cylinder 76 in the vertical direction, while the upper end 76d of the opening 76c is lower than the upper edge 76a of the cylinder 76. Is located. As described above, the opening 76c is provided at the upper part of the side surface 76b of the cylindrical body 76, that is, at a position above the intermediate position in the vertical direction of the cylindrical body 76, so that the opening 76c is formed at the lower part of the side surface 76b of the cylindrical body 76. Compared with the case where it is provided, the washing water flowing into the opening 76c can have a low head pressure, and thereby the water flowing into the cylinder 76 from the opening 76c and flowing out from the drain port 22a. Is weakened, the force for pulling the valve body 72 is weakened, and the valve body 72 is closed at the target timing.

  As a switching valve 84 that can open and close the opening 76c, as shown in FIGS. 3 and 5, a first switching valve 90 and a second switching valve 92 provided on the outer side thereof are provided. The first switching valve 90 and the second switching valve 92 are double valves that open and close the opening 76c stepwise in terms of opening area. The first switching valve 90 and the second switching valve 92 are provided with a flow rate adjusting mechanism for adjusting the amount of washing water flowing from the outside of the cylinder 76 into the cylinder 76 when the washing water is discharged from the drain port 22a. Configure. Each of the first switching valve 90 and the second switching valve 92 is a substantially rectangular plate-like member corresponding to the substantially rectangular opening 76c, and rotates so as to close the opening 76c from the outside of the cylindrical body 76. It is provided in a supported state. The first switching valve 90 and the second switching valve 92 are provided in such a manner that the first switching valve 90 is positioned on the inner side and the second switching valve 92 is positioned on the outer side with respect to the opening 76c so as to overlap each other.

  As shown in FIG. 3, the cylindrical body 76 includes shafts 76f below and laterally below the opening 76c, and the first switching valve 90 includes a receiving portion 90a that is rotatably fitted by these shafts 76f. In addition, the second switching valve 92 is formed with a hole portion 92a that is rotatably fitted to the receiving portion 90a. As shown in FIG. 3, when the first switching valve 90 and the second switching valve 92 are attached to the cylinder 76, the shaft 76f, the receiving portion 90a, and the hole 92a constitute a shaft body. That is, the first switching valve 90 and the second switching valve 92 are supported by a common shaft body so as to be rotatable within a predetermined rotation range.

  Accordingly, the first switching valve 90 can be pivoted about the shaft body from the lower position to the position where the opening 76c is closed around the shaft body, and the second switching valve 92 is opened from the lower position to the opening portion. It can be rotated to a position adjacent to the first switching valve 90 which is closed in parallel with the first switching valve 90.

  Next, as shown in FIGS. 3 and 5, the first switching valve 90 has a communication port through which the outside and the inside of the cylindrical body 76 communicate when the first switching valve 90 closes the opening 76 c. 90b is formed. The opening cross-sectional area of the communication port 90b is smaller than the opening cross-sectional area of the opening portion 76c, and the size of the opening cross-sectional area of the communication port 90b is larger than that when the opening portion 76c is fully opened. The size is reduced. Thus, the first switching valve 90 can adjust (decrease) the opening cross-sectional area of the opening 76c of the cylindrical body 76.

  Next, the second switching valve 72 provided outside the first switching valve 71 is closed, that is, the opening reduced by the first switching valve 90 due to the opening 76c being closed. The opening area of 76c is further reduced. For this reason, the second switching valve 92 is formed with a protrusion 92b extending toward the first switching valve 90 side. The second switching valve 92 further reduces the opening area of the opening 76c by the communication port 90b by inserting the protruding portion 92b into the communication port 90b of the first switching valve 90 in the closed state. The protrusion 92 b is formed at a position and an angle at which the protrusion 92 b can be inserted into the communication port 90 b of the first switching valve 90 when the second switching valve 92 is close to or adjacent to the first switching valve 90.

  Further, the lower end portion of the second ball chain 62 attached to the above-described second lifting member 58 is attached to the second switching valve 92 at the tip position on the opposite side of the above-described shaft body. A weight 96 is attached to the first switching valve 90, and a weight 98 is attached to the second switching valve 92. These weights 96 and 98 are for stabilizing the operation of each switching valve 90 and 92.

  As shown in FIGS. 2 and 5, a control cylinder 78 is attached to the inside of the cylinder 76. As shown in FIG. 2, the cylinder 76 and the control cylinder 78 surround the drain port 22a. The overflow pipe 74 is configured to be movable up and down while being inserted through the inner wall 78b of the control cylinder 78, and the valve body 72 opens and closes the drain port 22a. Has been.

  At this time, as shown in FIGS. 2 and 5, the control cylinder 78 and the cylinder 76 have small holes 78 e and 78 f formed in the outer wall 78 a of the water storage cylinder (water storage part) 78 d of the control cylinder 78, respectively. It arrange | positions so that it may be located in the other side of the opening part 76c formed in 76. FIG.

  Next, the operation of the tank apparatus according to the embodiment of the present invention will be described. First, a large cleaning mode executed by the cleaning water tank apparatus 18 according to the embodiment of the present invention will be described with reference to FIGS.

  In addition, this description is an example in the state in which both the small holes 78e and 78f formed in the water storage cylinder 78d described above are opened (the state in which the small hole 78e is not closed by the slide member 86).

  First, as shown in FIG. 6, when the user starts the large cleaning mode, the user rotates the operation lever 48 90 degrees toward the front side, or the large cleaning button is pressed and the motor 50 is activated (driven). Only the first lifting member 56 is rotated, and the overflow pipe 74 and the valve body 72 are pulled up to a predetermined height position as shown in FIG. 6 through the first ball chain 60, whereby the drain port 22a. Will open and draining will begin. Here, the float 80 whose rise by the buoyancy is regulated by the fixing member 82 rises as the fixing member 82 rises integrally with the overflow pipe 74.

  Immediately after completion of such lifting, the operating lever 48 is returned to the initial position, the first lifting member 56 is returned to the initial rotation angle, or when the lifting is performed by the operation of the motor 50, Immediately after the completion of the lifting, the motor 50 is operated so that the first lifting member 56 returns to the initial rotation angle. At this time, since the second lifting member 58 is not rotated, the switching valves 90 and 92 for opening and closing the opening 76c of the cylindrical body 76 remain at positions separated from the opening 76c as shown in FIG. It is. Therefore, the opening 76c of the cylinder 76 is fully open, and the opening cross-sectional area is not changed.

  Next, as shown in FIG. 7, after the start of drainage, the overall water level (WL) of the cleaning water in the water storage tank 22 decreased with time, and the water level decreased to the vicinity of the upper edge 76a of the cylinder 76. At that time, the cleaning water in the cylinder 76 is suddenly discharged from the drain port 22a.

  Accordingly, the level of the cleaning water in the water storage cylinder 78d starts to decrease at a predetermined speed according to the flow rate flowing out from the small holes 78e and 78f. Accordingly, the float 80 also descends as the water level in the water storage cylinder 78d decreases, and the overflow pipe 74 and the valve body 72 descend at the same speed as the float 80 descends in conjunction with the descending of the float 80. To do. Then, after a predetermined time has elapsed, when the water level of the washing water in the water storage cylinder 78d has dropped to a level that does not give buoyancy to the float 80, the valve body 72 closes the drain port 22a (valve closing), and drainage ends. In this way, the float 80 moves down to cause the drain valve to close the drain port 22a.

  Next, the water level (WL1) shown in FIG. 8 is the water level outside the cylinder 76 immediately after the valve closing, and the water level (DWL) is the water level outside the cylinder 76 after such valve closing. It is the dead water level which flows into the cylinder 76 via 76c and is finally obtained. As described above, the water level (WL1) outside the cylinder 76 immediately after closing the valve is positioned between the upper end 76d and the lower end 76e of the opening 76c, so that the water level in the water storage tank 22 is changed to the cylinder. The momentum of water is weaker at the end of drainage than when it is lowered to near the upper edge of 76. That is, when the water level outside the cylinder 76 is located above the upper end 76d of the opening 76c, the cleaning water flows into the cylinder 76 from the entire opening 76c. On the other hand, when the water level outside the cylindrical body 76 is located between the upper end 76d and the lower end 76e, the cleaning water is supplied from only the portion of the opening 76c between the water level outside the cylindrical body 76c and the opening 76c. Flows into the body 76. And since the water level outside the cylinder 76c becomes low, the flow rate of the washing water flowing out from the opening 76c gradually decreases. That is, the momentum of the water is weaker at the end of drainage than at the start of drainage, and the force to draw the valve body 72 is weakened. The valve body 72 is closed at the target timing, so the washing water varies by a predetermined amount. Can be supplied to the toilet.

  As described above, in the flush water tank device 18 of the present embodiment, the first switching valve 90 and the second switching valve 92 open the opening 76c, and the washing water is passed from the opening 76c to the flush toilet 1 through the drain port 22c. When a predetermined amount of washing water is supplied, the drain valve closes the drain port 22c, so that the water level outside the cylinder 76 immediately after the drain valve closes the drain port 22c is lowered from the upper end of the opening 76c to the lower end. It is provided with a configuration that is located between the two. The above-described example of the large cleaning mode has been described in a state where both of the small holes 78e and 78f formed in the water storage cylinder 78d are open (the small hole 78e is not closed by the slide member 86). 78f, if one small hole 78e is closed by the slide member 86, the rate of reduction of the water level in the water storage cylinder 78d is slowed, and the valve closing timing is slowed to increase the amount of water for washing. I can do it.

  Further, the flush toilet 1 according to the present invention is characterized by including the flush water tank device 18. In the present invention configured as described above, the minimum predetermined washing water amount necessary for toilet flushing can be accurately supplied to the toilet bowl body 2 with respect to the flushing flush toilet 1 that has achieved water saving. .

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be configured in various forms without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Wash-out type flush toilet 2 Toilet body 4 Bowl part 6 Water conduit 8 Drain trap pipe 8a Inlet 8b Ascending path 8c Downward path 10 Rim 12 1st outlet 14 Reservoir 16 16 2nd outlet 18 Washing water tank apparatus 20 Exterior tank 22 Water storage tank 22a Drain port 22b Drain port member 24 Lid 24a Bowl 24b Water outlet (inlet)
DESCRIPTION OF SYMBOLS 25 Water guide member 26 Heat insulator 28 Engagement member 30 Engagement member 31 Water supply pipe 32 Callan 34 Washing water water supply apparatus 36 Water supply pipe 38 Water supply apparatus float 40 Water discharge pipe 42 Lever 44 Water supply valve 46 Operation apparatus 48 Operation lever 50 Motor 52 Operation Button 54 Rotation transmission member 56 First lifting member 58 Second lifting member 60 First ball chain 62 Second ball chain 70 Drainage device 72 Valve body 74 Overflow pipe 74a Valve body holding portion 74b Retaining portion holding recess 76 Tube 76a Upper edge portion of cylindrical body 76b One side portion of cylindrical body 76c Opening portion 76d Upper end portion 76e Lower end portion 76f Shaft 78 Control cylinder 78a Outer side wall 78b Inner side wall 78c Middle horizontal wall 78d Water storage cylinder 78e, 78f Small hole 78g Inlet 78 Flow Inlet 80 Float 82 Fixed member 84 Switching valve 86 Slide member 9 First switching valve 90a receiving 90b communicating port 92 second switching valve 92a hole 92b protruding portions 96 weight 98 weight W reservoir surface

Claims (2)

A washing water tank device for storing washing water for washing a flush toilet,
A water storage tank in which washing water is stored and a drain outlet is formed on the bottom;
A drainage valve that opens and closes the drainage outlet and supplies cleaning water to the flush toilet;
Has a side surface extending vertically upward from the bottom of the water storage tank so as to surround the drain outlet, a cylindrical body having an opening formed on the side surface with the upper is opened,
A switching valve for opening and closing the opening;
A control cylinder disposed inside the cylinder,
A float that is disposed within the control cylinder and causes the drain valve to close the drain by descending; and
Descent operation control means for controlling the descent operation of the float provided in the control cylinder,
The opening is located on a side surface of the cylindrical body and above an intermediate position in the vertical direction,
When the switching valve opens the opening and supplies a predetermined amount of washing water to the flush toilet from the opening through the drain, the drain valve closes the drain, thereby A washing water tank apparatus characterized in that the water level outside the cylinder immediately after the drain valve closes the drain port is located between the upper end and the lower end of the opening. A wash-off type flush toilet comprising the flush water tank device according to claim 1 and performing toilet flushing by flushing filth by flowing water caused by a drop in flush water.