JP6666578B2 - Drain valve device, flush water tank device equipped with this flush valve device, and flush toilet equipped with this flush water tank device - Google Patents

Description

  The present invention relates to a drain valve device, a flush water tank device equipped with the flush valve device, and a flush toilet equipped with the flush water tank device, and in particular, effectively reduces the instantaneous flow rate of flush water. TECHNICAL FIELD The present invention relates to a flush valve device for a flush water tank, a flush water tank equipped with the flush valve device, and a flush toilet equipped with the flush water tank device.

BACKGROUND ART Conventionally, as a drain valve device for a wash water tank that stores wash water for washing a toilet body, for example, as described in Patent Document 1, a drain port unit attached to a drain port formed in a wash water tank, A drain valve unit having a drain valve for opening and closing a drain port, and a drain valve unit having a cup-shaped cylinder detachably attached to the drain port unit so as to surround the drain valve unit are known. I have.
In such a conventional drain valve device, when the flushing operation of the toilet is started and the drain valve is opened, the flush water in the flush water tank flows from the upper end opening of the cylindrical body, and then the flush water tank. Wash water is supplied to the toilet body from the drain port of the toilet.
In addition, while the drain valve is open, the water level in the washing water tank drops from the initial water level (full water level) above the cylinder to the upper edge position of the cylinder (static water level (or dead water level)). Then, the washing water is left in the area outside the cylindrical body, and the supply of the washing water from the washing water tank to the toilet body is stopped.
Therefore, in the conventional drain valve device using the cylindrical body as described in Patent Literature 1, the flush water amount from the full water level to the still water level (or dead water level) is supplied from the flush water tank to the toilet body. The flush water amount is determined, and the still water level (or dead water level) in the flush water tank after flushing the toilet is determined by the upper edge position of the cylindrical body.

Japanese Patent No. 5057190

In recent years, as flush toilets have become more water-saving, the amount of flush water used has decreased, and the opening time and operating time of the drain valve, as well as the shape and volume of the cylindrical body, have been reduced by the flush water tank. There is a problem that it affects the instantaneous flow rate of the washing water supplied to the toilet body through the cylindrical body and the washing performance of the toilet.
In particular, in a conventional drain valve device using a cup-shaped cylinder, a comparison is made between the washing water tank before and after the washing water near the upper end opening of the cylinder flows into the cylinder from the upper opening of the cylinder. Since the flow cross-sectional area changes from a very large flow cross-sectional area to the flow cross-sectional area inside the cylinder, the instantaneous flow rate drops sharply before and after flowing into the cylinder, preventing efficient supply of flush water to the toilet body. Has become.
Therefore, when the flush water flows into the cylinder, it is possible to effectively suppress the instantaneous flow rate of the flush water from lowering, efficiently supply the flush water to the toilet body, and improve the flush performance of the toilet body. It has been a requested issue whether to realize water saving of the washing water.

  Therefore, the present invention has been made in order to solve the above-mentioned problems of the related art and the required problem, and a drain valve device capable of effectively suppressing a decrease in the instantaneous flow rate of washing water. An object of the present invention is to provide a flush water tank device provided with the drain valve device and a flush toilet provided with the flush water tank device.

In order to achieve the above object, the present invention is a drain valve device for a wash water tank that stores wash water for washing a toilet body, a drain port attached to a drain port formed in the wash water tank, and A main body having a valve body for opening and closing the drain port, and a tubular body attached to the main body part, and the tubular body has a lower opening attached to the drain port of the main body part; A bottom portion protruding outward from the lower opening to form a bottom surface of the cylindrical body, a side wall portion extending upward from the bottom portion and surrounding the main body portion, and an upper side continuous with the upper end of the side wall portion An opening portion, wherein a curved surface is formed in the upper opening portion of the cylindrical body so as to be separated from the main body portion from a lower end toward an upper end thereof, and the main body portion further includes the cylindrical body. A first region inside the body and outside the body, and A communication port that forms a communication port that communicates with the second region in the mouth, wherein the cylindrical body has a flow path cross-sectional area formed in the first region above the communication port and having a lower cross-sectional area; The bottom surface of the cylindrical body is formed so as to have a lower opening from a lower end of the side wall portion such that a cross-sectional area of a flow path in a lower region in the cylindrical body decreases downward. It is characterized by being formed in a curved shape toward the upper end of the portion .
In the present invention thus configured, since the curved surface is formed in the upper opening of the cylindrical body so as to be separated from the main body from the lower end to the upper end, the valve of the main body of the drain valve device is provided. When the drain port of the washing water tank is opened due to the opening of the body and the water level in the washing water tank decreases, the cross-sectional area of the washing water tank rapidly changes from a relatively large cross-sectional area to the cross-sectional area of the cylinder. Is suppressed. Therefore, the pressure loss in the vicinity of the upper opening of the cylindrical body is suppressed, and the washing water flowing into the upper opening of the cylindrical body smoothly enters the cylindrical body along the curved surface of the upper opening of the cylindrical body. Can flow into Further, when the flush water flows into the cylinder, the instantaneous flow rate of the flush water can be effectively prevented from being reduced, and the flush water can be efficiently supplied to the toilet body. As a result, it is possible to improve the washing performance of the toilet body and to save water for washing.
Further, the main body portion includes a communication port portion that forms a communication port that connects the first region inside the cylindrical body and outside the main body portion and the second region inside the drain port portion. Since the flow path cross-sectional area of the first region of the main body portion above the communication port portion is formed to decrease downward, the cleaning water in the cleaning water tank is formed outside the main body portion. When passing through the flow path from the area 1 to the drainage port of the washing water tank from the second area in the drainage port through the communication port, the flow of the cleaning water is less likely to be separated in the flowpath, resulting in turbulence. Can be suppressed.
Therefore, it is possible to suppress a decrease in the instantaneous flow rate of the wash water in these channels, and it is possible to efficiently supply the wash water to the toilet body, thereby improving the cleaning performance of the toilet body. At the same time, water saving of the washing water can be realized.
In addition, since the bottom surface of the cylindrical body is formed in a curved shape from the lower end of the side wall to the upper end of the lower opening so that the flow path cross-sectional area of the lower region in the cylindrical body decreases downward. The volume of the cylinder itself can be reduced as compared with the case where a cylinder having a flat bottom surface is employed. Therefore, it is possible to reduce the amount of flush water supplied from the inside of the cylindrical body to the toilet body via the drain port, and to save water for flush water used for flushing the toilet.

In the present invention, preferably, from top Symbol first region via the communication port leading to the discharge port of the washing water tank from the second region flow path as located downstream, its flow passage area It is formed so as to be small.
In the present invention configured as above, the flow path from the first area through the communication port to the drain port of the washing water tank from the second area has a smaller flow path area as being located on the downstream side. Since the washing water in the washing water tank flows into the cylindrical body from the upper opening of the cylindrical body, the first region outside the main body portion communicates with the communication port through the communication port. When passing through the flow path from the second area to the drain port of the cleaning water tank, disturbance of the flow of the cleaning water in the flow path can be suppressed. Therefore, it is possible to suppress a decrease in the instantaneous flow rate of the wash water in these flow paths, and it is possible to efficiently supply the wash water to the toilet body, thereby improving the cleaning performance of the toilet body. At the same time, water saving of the washing water can be realized.

In the present invention, preferably, the cylindrical body can be attached to the main body from above after the main body is fixed to the washing water tank in advance.
In the present invention configured as described above, after the main body is fixed in advance to the washing water tank, the tubular body can be easily attached to the main body from above, thereby improving the cleaning performance of the toilet body. And water saving of the washing water can be realized.

Next, the present invention is a washing water tank device provided with the above drain valve device.
In the present invention configured as described above, it is possible to suppress the instantaneous flow rate of the wash water from decreasing when the wash water flows into the cylinder, and to efficiently supply the wash water to the toilet body. A water tank device can be provided. Therefore, it is possible to provide a flush water tank device capable of improving the flush performance of the toilet body and realizing saving of flush water.

Next, the present invention is a flush toilet provided with the above flush water tank device.
In the present invention configured as described above, it is possible to suppress a decrease in the instantaneous flow rate of the wash water when the wash water flows into the cylinder, and to efficiently supply the wash water to the toilet body. A toilet bowl can be provided. Therefore, it is possible to provide a flush toilet capable of improving the cleaning performance of the toilet body and realizing saving of washing water.

  ADVANTAGE OF THE INVENTION According to the drain valve apparatus of this invention, the flush water tank apparatus provided with this drain valve apparatus, and the flush toilet equipped with this flush water tank apparatus, it can suppress that instantaneous flow of flush water falls effectively. Can be able to.

1 is a schematic view showing a flush toilet provided with a flush water tank device to which a drain valve device according to a first embodiment of the present invention is applied. FIG. 2 is a sectional perspective view taken along the line II-II in FIG. 1. It is a top view of a drain valve device by a 1st embodiment of the present invention. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3. FIG. 5 is a sectional view taken along line VV of FIG. 3. It is the perspective view which looked at the cylinder of the drain valve device by a 1st embodiment of the present invention from diagonally above. FIG. 7 is a sectional view taken along line VII-VII in FIG. 6. FIG. 8 is a partially enlarged view in which a portion VIII of FIG. 7 is partially enlarged. FIG. 9 is a partial sectional view taken along line IX-IX in FIG. 7. It is the perspective view which looked at the cylinder of the drain valve device by a 2nd embodiment of the present invention from diagonally above. FIG. 11 is a sectional view taken along the line XI-XI in FIG. 10. FIG. 12 is a cross-sectional view along the line XII-XII in FIG. 10.

Hereinafter, a drain valve device according to a first embodiment of the present invention, a flush water tank device including the flush valve device, and a flush toilet including the flush water tank device will be described with reference to the accompanying drawings.
FIG. 1 is a schematic view showing a flush toilet provided with a flush water tank device to which a drain valve device according to a first embodiment of the present invention is applied, and FIG. 2 is a view along a line II-II in FIG. It is sectional drawing.

As shown in FIG. 1, a flush toilet 1 equipped with a flush water tank device to which a drain valve device according to a first embodiment of the present invention is applied includes a toilet body 2 for receiving waste and a rear side of the toilet body 2. And a rectangular parallelepiped washing water tank device 4 arranged on the upper surface of the tank.
By pressing the large flush button 4a or the small flush button 4b attached to the upper surface of the flush water tank device 4, flush water at a flow rate according to the flush form is supplied from the flush water tank device 4 to the toilet body 2. It has become.

As shown in FIG. 2, the washing water tank device 4 includes a washing water tank 6 and a drain valve device 8 according to the first embodiment of the present invention, which is attached to a drain port 6b formed on a bottom surface 6a of the washing water tank 6. And a water supply device 10 mounted on the bottom surface of the washing water tank 6 to supply washing water to the washing water tank 6.
Further, the drain valve device 8 includes an overflow pipe 12, and when the washing water in the washing water tank 6 exceeds a specified water level corresponding to the upper end position of the overflow pipe 12, the drain water flows to the downstream side of the drain valve device 8. It is made to let.

Next, the structure of the drain valve device according to the first embodiment of the present invention will be described with reference to FIGS.
FIG. 3 is a plan view of the drain valve device according to the first embodiment of the present invention, FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3, and FIG. It is sectional drawing along the line.

  As shown in FIGS. 2 to 5, the drain valve device 8 includes a drain port 14 attached to a drain port of the washing water tank 6, and a main body section 18 including a drain valve section 16 that opens and closes the drain port 14. And a generally cup-shaped cylinder 20 attached to the drain port 14.

As shown in FIG. 4, the drain port 14 has a substantially cylindrical drain port main body 22 attached to a drain port 6 b penetrating the bottom surface 6 a of the washing water tank 6, and an inside and downward direction of the drain port main body 22. A drainage channel forming portion 24 that includes a reduced diameter portion 24a that reduces the diameter, and that forms a drainage channel 24b that extends downward from the reduced diameter portion 24a so as to penetrate through the drain port 6b of the washing water tank 6; And a valve seat 26 which is formed in a substantially annular shape along the upper edge of the valve seat 24a and protrudes upward. A region on the inner peripheral side of the valve seat 26 substantially forms a drain port 14a of the drain port portion 14, and the drain port 14a is used for flushing water in the flush water tank 6 with the toilet body 2 side. It is equivalent to a drain port that is drained.
As shown in FIG. 5, the drain port 14 is provided so as to integrally connect a lower portion of the overflow pipe 12 and the drain port main body 22, and communicates the drain passage 24 b with the overflow pipe 12. An overflow pipe connecting portion 28 is provided.

As shown in FIG. 4, the lower end of the drain port main body 22 is inserted into the drain port 6 b of the washing water tank 6, and a flange 30 is formed on the outer periphery below the drain port main body 22. . The flange portion 30 sandwiches the annular packing 32 with the bottom surface 6a of the washing water tank 6 on the lower side, so that the washing water stored in the washing water tank 6 can be flushed with the drain port main body 22 and the washing water tank. 6 is prevented from flowing out of a gap between the bottom surface 6a and the drain port 6b.
As shown in FIGS. 4 and 5, a mounting portion on the outer peripheral surface of the drain port main body 22 to which a mounting portion of the tubular body 20 (a lower opening 46 described later in detail) is mounted is directed outward. The protruding protrusion 34 is formed in a belt shape over the entire circumference.

Further, as shown in FIGS. 2, 4 and 5, a plurality of communication ports 36 are formed in the area above the valve seat 26 of the drain port main body 22 in the circumferential direction. Is formed in a rectangular shape in a side view shown in FIG. 4 and a front view shown in FIG.
As shown in FIGS. 3 and 4, each communication port 36 connects a first area A1 inside the cylindrical body 20 and outside the main body 18 and a second area A2 inside the drain port 14. When the water level of the washing water in the washing water tank 6 is located higher than the upper edge of the cylindrical body 20, the washing water flowing into the cylindrical body 20 is discharged from each communication port 36 to the drain port. 14.

  The overflow pipe connecting portion 28 of the drain port 14 fluidly connects the inside of the overflow pipe 12 and the inside of the drain port 14 with the rib 28 a that structurally connects the overflow pipe 12 and the drain port 14. A communication passage 28b is provided, whereby the overflow pipe 12 and the drain port 14 are integrally formed.

As shown in FIG. 4, the drain valve section 16 includes a disc-shaped valve body 38 that opens and closes the drain port 14 by contacting the valve seat 26 of the drain port 14.
In addition, the drain valve portion 16 includes a main shaft member 42 provided with a valve body 38 on the lower end side and connected to a link mechanism 40 connected on the upper end side to the large washing button 4a and the small washing button 4b. I have.
Further, the drain valve portion 16 includes a cylindrical casing 44 that covers the valve body 38 and the main shaft member 42 and forms the appearance of the drain valve portion 16.

Next, the structure of the cylindrical body of the drain valve device according to the first embodiment of the present invention will be described with reference to FIGS.
FIG. 6 is a perspective view of the cylindrical body of the drain valve device according to the first embodiment of the present invention as viewed obliquely from above. FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. FIG. 9 is a partial enlarged view of a portion VIII of FIG. 7 partially enlarged, and FIG. 9 is a partial sectional view taken along line IX-IX of FIG.

  As shown in FIG. 4 and FIG. 7, the cylindrical body 20 has a lower opening 46 fitted and attached to the drain port 14 of the main body 18 attached to the drain port 6 b of the washing water tank 6. A bottom surface portion 48 protruding from the opening 46 to the outer peripheral side to form the bottom surface of the cylindrical body 20, a side wall portion 50 extending upward from the bottom surface portion 48 and surrounding the outer periphery of the main body portion 18, and an upper end portion of the side wall portion 50 And an upper opening 52 that is continuous.

Since the lower opening 46 is fitted into the substantially cylindrical drain port main body 22 from the outside, the cross-section is substantially circular in plan view, and the lower opening 46 is provided with the mounting portion 54 of the cylindrical body 20 mounted to the main body 18. Forming a part.
As shown in FIGS. 4 and 7, a first mounting surface 58 facing the outer peripheral surface 56 of the drain port 14 is formed on the inner peripheral side of the lower opening 46. On the mounting surface 58, a first claw portion 60 is formed, which is a permeation preventing means for preventing the cleaning water outside the cylinder 20 from entering the interior of the cylinder 20 from the cylinder 20.
The first claw portion 60 protrudes upward, and is deformed when the cylindrical body 20 is attached to the drain port portion 14 to reduce a gap between the first mounting surface 58 and the outer peripheral surface 56 of the drain port portion 14. It can be sealed.
In the present embodiment, the first claw 60 is formed over the entire circumference of the first mounting surface 58 of the lower opening 46, but the first claw 60 is The first mounting surface 58 of the side opening 46 may be formed at intervals along the circumferential direction.

Further, a plurality of (four) rectangular projections 62 are formed on the first mounting surface 58 at an interval in the circumferential direction and project inward toward the center, that is, inward. When the cylindrical body 20 is attached to the drain port 14, it can engage with the protruding portion 34 of the drain port 14.
The number of the protrusions 62 is not limited to four as long as a plurality of protrusions 62 are formed on the first mounting surface 58.

One end of the bottom surface 48 is smoothly connected to the lower opening 46, and the other end is smoothly connected to the side wall 50.
As shown in FIG. 4, the side wall portion 50 faces the drain port main body 22 of the drain port portion 14 and the casing 44 of the drain valve portion 16 at a distance, and is slightly inclined downward. .
Thereby, the cylindrical body 20 is formed such that the flow path cross-sectional area in the first region A1 decreases downward.
Therefore, the flow path from the first area A1 through the communication port 36 to the drain area 14a of the drain area 14 from the second area A2 is formed so as to become smaller as the area of the flow path is located on the downstream side. ing.

Next, in FIG. 5, the water level of the cleaning water in the cleaning water tank 6 corresponding to the height position of the upper edge 52 a of the upper opening 52 of the cylindrical body 20 is indicated by a still water level (or dead water level) DWL. I have.
In addition, regarding the flow path cross-sectional area of the first region A1 inside the cylindrical body 20 and outside the main body 18 at the height position P1 near the lower edge 52b of the upper opening 52 of the cylindrical body 20, the flow path area S1 The flow path cross-sectional area of the first region A1 inside the cylindrical body 20 and outside the main body 18 at the height position P2 below the height position P1 and above the communication port 36 is defined as a flow path. The area is S2.
Further, in FIG. 5, at a height position P3 where each communication port 36 is formed below the height position P2, the total opening area of all the communication ports 36 is indicated by a flow path area S3. At the height position P4 of the drain port 14a below each communication port 36, the opening cross-sectional area of the drain port 14a is indicated by S4.
In FIG. 5, the flow path cross-sectional area near the lower end of the drainage channel 24b of the drainage channel forming unit 24 is indicated by S5.
As shown in FIG. 5, each of the flow passage areas S1 to S5 is set so as to become smaller toward the downstream side from the position P1 to the position P5.

A slit 66, which is a vertically long opening, is formed at the center in the front-rear direction of the first side surface 64 (see FIG. 2) of the side wall portion 50 of the cylindrical body 20 facing the overflow tube 12, up to the bottom surface portion 48, It communicates with the opening 46a of the lower opening 46.
By forming the slit 66 of the side wall 50 in this way, the rib 28 a of the overflow pipe connecting portion 28 of the drain port 14 is attached to the side wall of the cylindrical body 20 when the cylinder 20 is attached to the drain port 14. It is designed to be inserted into 50 slits 60.

As shown in FIG. 9, a second mounting surface 68 facing the overflow pipe connecting portion 28 of the drain port 14 is formed in the slit 66 of the side wall portion 50 of the cylindrical body 20. Is integrally formed with a second claw portion 70 which is an infiltration preventing means for preventing the washing water outside the cylindrical body 20 from entering the inside of the cylindrical body 20.
The second claw portion 70 protrudes upward, and is deformed when the cylindrical body 20 is attached to the drain port 14, and is deformed to form the second mounting surface 68 and the rib of the overflow pipe connecting portion 28 of the drain port 14. 28a is closed.

As shown in FIGS. 6 and 7, the upper opening 52 has a curved surface 72 that is separated from the main body 18 (that is, the center of the cylindrical body 20) from the lower end 52 a to the upper end 52 b of the upper opening 52. Is formed.
As shown in FIGS. 2 and 7, the curved surface 72 of the upper opening 52 is formed by the upper edge portion of the upper opening 52 of the cylindrical body 20 on the water supply device 10 side (the upper side of the cylindrical body 20 when viewed from the front side). A maximum curved surface 72a that is the most curved is formed in the left upper edge portion of the opening 52).
On the other hand, the upper edge portion of the upper opening 52 of the cylindrical body 20 other than the left upper edge portion, ie, the front and rear upper edge portions and the right upper edge portion of the upper opening portion 52 of the cylindrical body 20 are the upper opening portions of the cylindrical body 20. It is hardly curved as compared to the maximum curved surface 72a of the upper left edge portion of the portion 52.

  In the present embodiment, as shown in FIGS. 2 and 7, the maximum curved surface 72 a of the curved surface 72 of the upper opening 52 is formed by the upper edge portion of the upper opening 52 of the cylindrical body 20 on the water supply device 10 side ( A description will be given of a form provided only in the upper left edge portion of the upper opening 52 of the cylindrical body 20 when viewed from the front side, but the peripheral space in the front-rear direction of the cylindrical body 20 in the washing water tank 6 and the overflow pipe 12 side If a sufficient peripheral space can be ensured, a curved surface similar to the maximum curved surface 72a may be provided in the front and rear upper edge portions and the right upper edge portion of the upper opening 52 of the cylindrical body 20.

Next, a method of mounting the tubular body in the drain valve device according to the first embodiment of the present invention will be described with reference to FIGS. 4, 5, 8, and 10.
First, the lower portion of the drain port 14 of the main body 18 of the drain valve device 8 is inserted and fixed from above into the drain port 6b of the washing water tank 6 in advance. The tubular body 20 selected according to the above is attached to the drain port 14 of the main body 18 of the drain valve device 8 from above.
Specifically, by moving the unattached cylindrical body 20 located above the main body 18 of the drain valve device 8 downward, the drain valve device 8 is inserted into the opening 46 a of the lower opening 46 of the cylindrical body 20. From the upper portion of the main body 18 to the vicinity of the protruding portion 34 below the drain outlet main body 22. Then, the cylindrical body 20 is moved until the projection 62 on the inner peripheral side of the lower opening 46 of the cylindrical body 20 rides over the projection 34 on the outer peripheral side of the drain port main body 22 of the main body 18 of the drain valve device 8. 18, the inner peripheral side of the lower opening 46 of the cylindrical body 20 is projected on the outer peripheral side of the drain port main body 22 of the drain port 14 of the main body 18 of the drain valve device 8. 34.
At this time, the first claw portion 60 of the cylindrical body 20 is crushed and deformed by the protruding portion 34 of the drain port 14, the gap between the cylindrical body 20 and the drain port main body 22 is sealed, and the cylindrical body 20 is closed. Is prevented from entering the drain port 14 from the gap between the cylindrical body 20 and the drain port main body 22.
At the same time, the second claw portion 70 of the cylindrical body 20 is crushed and deformed by the rib 28a of the connecting portion 28, the gap between the cylindrical body 20 and the connecting portion 28 is sealed, and the cleaning water outside the cylindrical body 20 is closed. Is prevented from entering the drain port 14 from the gap between the cylindrical body 20 and the connection portion 28.

In addition, when the lower opening 46 of the cylindrical body 20 is fitted to the drain port main body 22 of the drain port 14, the upper end of the projection 62 of the cylindrical body 20 is in contact with the lower end of the protrusion 34 of the drain port 14. The locking is performed, and the cylindrical body 20 is firmly fixed to the main body 18.
Thus, the tubular body 20 can be prevented from dropping from the drain port 14 due to the buoyancy of the washing water in the washing water tank 6.

  As described above, since the tubular body 20 that can be selected according to the specification of the washing water tank 6 can be retrofitted from above to the main body 18 that is attached to the washing water tank 6 in advance, various cylinders can be installed. By selecting the body 20 and attaching the body 20 to the main body 18 as appropriate, the specified water level such as the minimum water level (static water level (or dead water level) DWL) in the cleaning water tank 6 according to the specifications of the cleaning water tank 6 It is possible to easily set the amount of washing water to be supplied to the toilet body 2 side.

Further, when the flushing of the toilet body 2 is started, when the drain port 14 a of the drain port 14 is opened by opening the valve body 38 of the main body 18 of the drain valve device 8, the inside of the flush water tank 6 is opened. After the flush water flows into the tubular body 20 from the upper opening 52 of the tubular body 20, the flush water is discharged from the drain port 14 to the toilet body 2 through the drain port of the flush water tank 6, and the flush water in the flush water tank 6 is washed. The water level drops.
When the water level of the washing water drops below the upper end 52b of the upper opening 52 of the cylindrical body 20, the washing water does not flow into the inside from the upper opening 52 of the cylindrical body 20. The water level can be stopped at the still water level (or dead water level) DWL.
Therefore, the specified water level (static water level (or dead water level) DWL) in the cleaning water tank 6 can be easily set only by retrofitting the cylinder 20 selected according to the specification of the cleaning water tank 6 to the main body 18. Therefore, the amount of washing water supplied from the washing water tank 6 to the toilet body 2 can be easily adjusted.

Next, a drain valve device according to an embodiment of the present invention, a flush water tank device equipped with the flush valve device, and a flush toilet equipped with the flush water tank device will be described with reference to FIGS. 1, 4 and 5. Will be described.
First, when the user presses the large cleaning button 4a or the small cleaning button 4b, the link mechanism 40 operates in response to the pressing, and the main shaft member 42 is pulled up.
As a result, the valve body 38 is pulled up together with the main shaft member 42, and is opened by being separated from the valve seat 26, so that the reduced diameter portion 24a and the drainage channel 24b of the drainage channel forming portion 24 are opened.

Then, the cleaning water in the cleaning water tank 6 flows into the cylindrical body 20 from the upper opening 52 of the cylindrical body 20, so that the cleaning water flows from the drain port 14 a of the drain port 14 to the reduced diameter of the drain channel forming part 24. It is discharged to the toilet body 2 via the part 24a and the drainage channel 24b.
Until the level of the washing water in the washing water tank 6 drops to the position of the upper opening 52 of the cylinder 20, the washing water in the washing water tank 6 flows from the upper opening 52 of the cylinder 20 into the cylinder 20. Flow into

At this time, since the upper opening 52 of the cylindrical body 20 is curved from the lower end 52a to the upper end 52b, the cross-sectional area of the relatively large flow path in the washing water tank 6 is changed from the cross-sectional area of the flow path in the cylindrical body 20. Since the rapid change is suppressed, the pressure loss in the vicinity of the upper opening 52 of the cylinder 20 is suppressed, and the washing water flowing into the upper opening 52 of the cylinder 20 is reduced by the curved surface 72 of the upper opening 52. Along the inside of the cylindrical body 20 can be smoothly flowed.
Further, since the instantaneous flow rate of the wash water is effectively prevented from decreasing when the wash water flows into the cylindrical body 20, the wash water can be efficiently supplied to the toilet main body 2.
As a result, it is possible to improve the cleaning performance of the toilet body 2 and to save water for cleaning.

According to the drain valve device 8 according to the embodiment of the present invention described above, the curved surface 72 is formed in the upper opening 52 of the cylindrical body 20 so as to be separated from the main body 18 from the lower end 52a to the upper end 52b. Therefore, when the drain port 14a of the drain port 14 in the cleaning water tank 6 is opened by opening the valve body 38 of the main body 18 of the drain valve device 8, the water level in the cleaning water tank 6 decreases. A sudden change from a relatively large cross-sectional area in the washing water tank 6 to a cross-sectional area in the cylindrical body 20 is suppressed. Therefore, the pressure loss in the vicinity of the upper opening 52 of the cylinder 20 is suppressed, so that the washing water flowing into the upper opening 52 of the cylinder 20 flows along the curved surface 72 of the upper opening 52 of the cylinder 20. As a result, it can flow smoothly into the inside of the cylindrical body 20.
In addition, when the flush water flows into the cylindrical body 20, the instantaneous flow rate of the flush water can be effectively prevented from decreasing, and the flush water can be efficiently supplied to the toilet body 2.
As a result, it is possible to improve the cleaning performance of the toilet body 2 and to save water for cleaning.

In addition, according to the drain valve device 8 according to the present embodiment, the flow path cross-sectional areas S1 and S2 of the cylindrical body 20 formed in the area A1 inside the cylindrical body 20 and outside the main body 18 decrease downward. After the washing water in the washing water tank 6 flows into the cylindrical body 20 from the upper opening 52 of the cylindrical body 20, the area A1 inside the cylindrical body 20 and outside the main body 18 is formed. When passing through the flow path, the flow of the cleaning water is less likely to separate in the flow path, and turbulence can be suppressed.
Therefore, the instantaneous flow rate of the wash water can be prevented from being reduced, and the wash water can be efficiently supplied to the toilet body 2, so that the cleaning performance of the toilet body 2 can be improved and the wash water can be improved. Water saving can be realized.

Further, according to the drain valve device 8 according to the present embodiment, from the first region A1 inside the cylindrical body 20 and outside the main body portion 18 through the communication port 36, from the second region A2 in the drain port portion 14 As for the flow path extending to the vicinity of the lower end of the drain port 14a of the drain port 14 and the lower end of the drain channel 24b of the drain channel forming part 24 in the washing water tank 6, the channel areas S1 to S5 become smaller as being located on the downstream side. Since the cleaning water in the cleaning water tank 6 flows into the cylindrical body 20 from the upper opening 52 of the cylindrical body 20, the cleaning water is communicated from the first region A1 outside the main body 18. The flow path from the second area A2 in the drain port 14 through the port 36 to the drain port 14a of the drain port 14 in the washing water tank 6 and the vicinity of the lower end of the drain 24b of the drain channel forming part 24 Suppresses turbulence in the flow path of the wash water when passing Door can be.
Therefore, it is possible to suppress the instantaneous flow rate of the washing water from decreasing in these flow paths, and it is possible to efficiently supply the washing water to the toilet body 2, thereby improving the cleaning performance of the toilet body 2. And water saving of the washing water can be realized.

Further, according to the flush water tank device 4 according to the present embodiment, it is possible to suppress the instantaneous flow rate of the flush water from decreasing when the flush water flows into the cylindrical body 20, and to efficiently flush the flush body 2 Can be provided.
Therefore, it is possible to provide the flush water tank device 4 which can improve the flush performance of the toilet body 2 and can save the flush water.

In addition, according to the flush toilet 1 according to the present embodiment, it is possible to suppress the instantaneous flow rate of the wash water from decreasing when the wash water flows into the cylindrical body 20, and to efficiently supply the wash water to the toilet body 2. A flush toilet 1 that can be supplied can be provided.
Therefore, it is possible to provide the flush toilet 1 which can improve the cleaning performance of the toilet body 2 and can save water for the flush water.

Next, a cylindrical body of a drain valve device according to a second embodiment of the present invention will be described with reference to FIGS.
FIG. 10 is a perspective view of the cylindrical body of the drain valve device according to the second embodiment of the present invention viewed obliquely from above. FIG. 11 is a cross-sectional view taken along line XI-XI of FIG. FIG. 11 is a cross-sectional view taken along line XII-XII of FIG. 10.
In addition, in the cylindrical body of the drain valve device according to the second embodiment of the present invention shown in FIGS. 10 to 12, the same parts as those of the cylindrical body 20 of the drain valve device 8 according to the first embodiment of the present invention have the same reference numerals. , And a description thereof will be omitted, and only a portion different from the cylinder 20 of the drain valve device 8 according to the first embodiment of the present invention will be described.

  As shown in FIGS. 10 to 12, in the cylindrical body 120 of the drain valve device according to the second embodiment of the present invention, the bottom surface portion 148 of the cylindrical body 120 has a flow path cross-sectional area of a lower region A3 in the cylindrical body 120. The cylindrical body 20 of the drain valve device 8 according to the first embodiment of the present invention is formed in a curved shape from the lower end of the side wall 150 to the upper end of the lower opening 146 so as to decrease downward. Is different from the bottom surface portion 48 of FIG.

According to the cylindrical body 120 of the drain valve device according to the second embodiment of the present invention, the bottom surface portion 148 of the cylindrical body 120 is configured such that the cross-sectional area of the flow path of the lower region A3 in the cylindrical body 120 decreases downward. Is formed in a curved shape from the lower end of the side wall portion 150 toward the upper end of the lower opening portion 146, so that the cylindrical body 120 is formed in comparison with the case where the cylindrical body 120 having the flat bottom surface 148 is employed. The volume of itself can be reduced.
Therefore, the amount of washing water supplied from the inside of the cylindrical body 120 to the toilet body 2 via the drain port 14a of the drain port portion 14 can be reduced, and water saving of the washing water used for toilet flushing can be realized.

In the above-described cylinder 20 of the drain valve device 8 according to the first embodiment of the present invention and the cylinder 120 of the drain valve device according to the second embodiment of the present invention, the drain port 6b of the washing water tank 6 is previously set. The lower portion of the drain port 14 of the main body 18 of the drain valve device 8 is inserted and fixed from above, and in this state, the cylinder 20 or 120 selected according to the specification of the washing water tank 6 is drained. Although the form which attached to drain port part 14 of main part 18 of valve device 8 from the above was explained, it is not limited to such a form and can be applied to other forms.
That is, as another form, before inserting the lower portion of the drain port 14 of the main body 18 of the drain valve device 8 into the drain port 6b of the washing water tank 6 from above and fixing the cylindrical body 20 or 120, After attaching the mounting portion of the cylindrical body 20 or 120 to a predetermined mounting portion of the drain port 14 of the body portion 18 of the drain valve device 8 in advance from below, the drain valve in a state where the cylindrical body 20 or 120 is mounted The lower portion of the main body 18 of the device 8 is inserted into the drain port 6b of the washing water tank 6, and the main body 18 and the cylindrical body 20 or 120 of the drain valve device 8 are fixed to the washing water tank 6. Is also good.

Reference Signs List 1 flush toilet 2 toilet body 4 flush water tank device 4a large flush button 4b small flush button 6 flush water tank 6a bottom surface 6b drain port 8 drain valve device 10 water supply device 12 overflow pipe 14 drain port 14a drain port 16 drain valve 18 Body 20 Cylindrical Body 22 Drain Port Main Body 24 Drainage Channel Forming Portion 24a Reduced Diameter Portion 24b Drainage Channel 26 Valve Seat 28 Overflow Pipe Connection Portion 28a Rib 28b Communication Path 30 Flange 32 Packing 34 Projection 36 Communication Port 38 Valve Body Reference Signs List 40 Link mechanism 42 Main shaft member 44 Casing 46 Lower opening 46a Opening 48 Bottom part 50 Side wall 52 Upper opening 52a Lower end 52b Upper end 54 Mounting part 56 Outer peripheral surface 58 First mounting surface 60 First claw part 62 Projection 64 First side surface 66 Slit 68 Second mounting surface 70 Second claw portion 72 Curved Surface 72a Maximum curved surface A1 First region A2 Second region A3 Lower region DWL Still water level (or dead water level)
S1 flow area S2 flow area S3 flow area S4 flow area S5 flow area

Claims (5)

A drain valve device for a washing water tank that stores washing water for washing a toilet body,
A water outlet attached to a water outlet formed in the washing water tank and a main body having a valve body for opening and closing the water outlet,
A cylinder attached to the main body,
The cylindrical body has a lower opening attached to a drain port of the main body, a bottom part protruding from the lower opening to the outer peripheral side to form a bottom surface of the cylindrical body, and an upper part extending from the bottom part. A side wall extending to surround the main body, and an upper opening continuous with an upper end of the side wall;
A curved surface is formed in the upper opening of the cylindrical body so as to be separated from the main body from the lower end toward the upper end,
The main body further includes a communication port that forms a communication port that communicates the first area inside the cylindrical body and outside the main body with the second area in the drain port,
The cylindrical body is formed such that a flow path cross-sectional area of the first region above the communication opening decreases downward .
The bottom surface portion of the cylindrical body is formed in a curved shape from the lower end of the side wall portion to the upper end of the lower opening portion so that the flow path cross-sectional area of the lower region in the cylindrical body decreases downward. A drain valve device.   The flow path from the first area via the communication port to the drain area of the washing water tank from the second area is formed so that the flow path area becomes smaller toward the downstream side. The drain valve device according to claim 1. The tubular body, after the body portion is pre-fixed to the washing water tank, the drainage valve device according to claim 1 or 2 is mountable from above the main body portion. A washing water tank device comprising the drain valve device according to any one of claims 1 to 3 . A flush toilet comprising the flush water tank device according to claim 4 .

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