JP2009019471A - Drainage apparatus for toilet bowl flushing water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water saving type drainage apparatus reducing the amount of flushing water used at a time. <P>SOLUTION: The drainage apparatus mounted to a drain port of a flushing water tank for storing flushing water for flushing a toilet bowl comprises a drainage part body having an inflow port and an outflow port of flushing water and mounted to the drain port; a drain valve element for opening/closing the inflow port; an overflow pipe with its base end connected in communication with the drainage part body downstream of the inflow port and with its tip extended upward; and a guide part formed inside the drainage part body to guide the flushing water from the inflow port to the outflow port. The guide part has a reduced diameter part smoothly and gradually reduced in diameter toward a lower part to form a clearance between itself and an inner side face of the drainage part body, and a restriction passage part continuously formed vertically downward from the reduced diameter part so that a passage cross section is approximately constant. Moreover, the length dimension of the restriction passage part is larger than the bore of the restriction passage part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drainage device for toilet flushing water.

  Conventionally, as a general drainage device for toilet flushing water attached to a drainage port of a flushing water tank for storing flushing water for washing toilet bowls, the flushing port has an inlet and an outlet for flushing water. A drainage body to be attached; a drainage valve body for opening and closing the inflow port; and an overflow pipe having a base end connected to the downstream side of the inflow port of the drainage unit main body and extending the tip upward There is something with.

In addition, in the trend of the times, there has been a demand for a water-saving drainage device that reduces the amount of cleaning water used per time. In order to meet the demand, a technique for conserving water while maintaining the cleaning ability by increasing the flow rate per unit time was considered.
As such a technique, for example, a cleaning water guide is provided at a drain outlet provided at the bottom of the cleaning water tank, and the flow passage cross-sectional area of this guide is continuously increased so that the outlet is larger than the inlet of the cleaning water. What has been changed is known (for example, see Patent Document 1).

  However, when the overflow pipe is connected to the drainage body, even if a washing water guide is provided, the flow of washing water in the washing water guide may be separated due to air suction from the overflow pipe. It was not possible to increase the flow rate per unit time on the street.

Therefore, a wash water flow path is formed concentrically with the inlet of the drainage body, and the peripheral wall of this flow channel partitions the wash water flow path and the overflow water flow path in which the communication portion between the drain pipe body of the overflow pipe is formed. Configuration is conceivable.
As a technical idea that separates the flow of washing water from the communication part of the drainage body of the overflow pipe, it is related to the washing water tank of the simple flushing toilet, which originally requires a small flow of washing water. Concentrically, an annular partition is provided at the height position of the connection port of the overflow pipe, and the inside of this partition is used as a washing water flow path (for example, see Patent Document 2).
JP 2001-262657 A Japanese Utility Model Publication No. 58-94770

  However, in the drainage device described in Patent Document 2, the entire circumference of the flow path is greatly reduced, and the length of the flow path formed by the partition and the shape thereof are not considered at all. Even when applied to a general flush toilet, the flow rate per short time could not be increased.

  An object of this invention is to provide the drainage apparatus for toilet bowl washing water which can solve the said subject.

  (1) In order to achieve the above object, in the drainage device for toilet flushing water according to the present invention, in the drainage device attached to the drainage port of the washing water tank for storing the flushing water for washing the toilet bowl, A drainage body having an inlet and an outlet and attached to the drain; a drainage valve body for opening and closing the inlet; and a base end communicating downstream of the inlet of the drainage body An overflow pipe connected and extended upward, and a guide part that is formed inside the drainage part main body and guides wash water from the inflow port to the outflow port. A diameter-reduced portion that is gradually and gradually reduced in diameter downward, forming a gap with the inner surface of the drainage body, and a cross-section of the flow path is substantially constant vertically downward from the reduced-diameter portion. A throttle channel portion formed continuously, and the throttle Is characterized in that is larger than the diameter of the throttle channel section the length of the flow path portion.

  (2) In the drainage device for toilet flushing water of (1) above, the guide portion is formed such that a lower end portion of the throttle channel portion is substantially at the same position as an outlet of the drainage portion main body. It is characterized by that.

  (3) In the drainage device for toilet flushing water according to (1), the guide portion is formed so that a substantially half circumference of a lower end portion of the throttle channel portion is longer than an outlet of the drainage portion main body. It is characterized by.

  (4) In the drainage device for toilet flushing water according to any one of (1) to (3), a gap formed between the guide portion and the drainage body is a gap on the overflow pipe side. Is formed to be wide.

  (5) In the drainage device for toilet flushing water according to any one of (1) to (4), the drain valve body is a flapper valve that is rotatably supported by the overflow pipe. To do.

  (6) In the drainage device for toilet flushing water according to any one of (1) to (5), the guide portion is subjected to a hydrophilic treatment at least from the reduced diameter portion to the throttle channel portion. It is characterized by being given.

  (7) The drainage device for toilet flushing water according to any one of (1) to (6) above, wherein the guide portion is detachably attached to the drainage body. .

  (8) In the drainage device for toilet flushing water according to any one of the above (1) to (7), the guide portion includes a plurality of legs protruding radially toward the drainage body. It is characterized by that.

  (9) In the drainage device for toilet flushing water according to any one of (1) to (8) above, a wave preventing ring protruding higher than the inflow port is provided on the outer periphery of the inflow port of the drainage body. It is characterized by that.

  According to the present invention, the guide portion for guiding the washing water from the inflow port to the outflow port is provided, and the guide portion is gradually and gradually reduced in diameter toward the lower side, between the inner side surface of the drainage portion main body. A reduced diameter portion in which a gap is formed, and a throttle channel portion that is continuously formed so that a cross section of the channel is substantially constant vertically downward from the reduced diameter portion. Since the length dimension is larger than the diameter of the throttle channel, the negative pressure in the channel is destroyed without sucking air from the overflow pipe into the channel when draining the wash water. In addition, the flow passage cross-sectional area of the throttle channel section is not unnecessarily small and the drainage does not become a contracted flow. Can be secured enough to generate a powerful siphon phenomenon and wash It is possible to increase the flow rate per unit of time, to improve the toilet flushing performance, can contribute to saving water.

  The drainage device for toilet flushing water according to the present embodiment is attached to a drainage port of a flushing water tank that stores flushing water for washing the toilet bowl, and has an inlet and an outlet for flushing water, A drainage body attached to the drainage port, a drainage valve body for opening and closing the inflow port, and a base end communicating with the downstream side of the inflow port of the drainage unit body, and extending the tip upward An overflow pipe and a guide part formed on the inner side of the drainage part main body, for guiding the washing water from the inflow port to the outflow port, and the guide part is gradually and gradually reduced in diameter toward the lower side; There is a reduced diameter part that forms a gap with the inner surface of the drainage part main body, and a throttle channel part that is continuously formed so that the cross section of the channel is substantially constant, vertically below the reduced diameter part. In addition, the length dimension of the throttle channel portion is equal to the diameter of the throttle channel portion. But also it made larger.

That is, according to the present embodiment, in the drainage body, the guide part forms a substantial washing water flow path, and this guide part is a part into which the washing water flows (the inlet of the drainage part body). Since the diameter-reduced portion is formed at the location corresponding to the), it is possible to prevent the occurrence of contraction by preventing the separation between the inner surface of the guide portion and the washing water that has flowed in as much as possible. be able to.
In addition, since the guide part that substantially forms the washing water flow path, the overflow water flow path communicating with the communication port of the overflow pipe formed in the drainage body and the washing water flow path are partitioned, The negative pressure generated in the flow path of the wash water is not destroyed, and the flow rate per unit time of the wash water can be increased by the siphon phenomenon. Moreover, since the length of the throttle channel portion is made larger than the diameter of the throttle channel portion, the flow velocity is further increased and the instantaneous maximum flow rate is increased.

  That is, in order to increase the flow rate (instantaneous maximum flow rate) per unit time of the wash water, a stable negative pressure region (siphon) is generated in the throttle flow path portion in the wash water flow path formed in the guide portion. It is valid.

As a condition for generating siphons, it is necessary to allow water to flow in a state in which the pipe inner wall surface in the throttle channel portion is in contact with certainty. To that end, it is important to pay attention to the following points.
(1) Do not separate the water flow near the inlet.
(2) Prevent air entry from the top, bottom and side (overflow pipe) directions.
(3) Ensure a sufficient negative pressure area.

  Therefore, in the present embodiment, as described above, the guide portion is gradually and gradually reduced in diameter toward the lower portion to form the reduced diameter portion, and the flow path cross section is substantially constant vertically downward from the reduced diameter portion. In this way, the throttle channel part is continuously formed and the inside of the channel is made smooth, thereby causing the Coanda effect to prevent the separation of the water flow and separating the drainage channel of the overflow pipe from the drainage channel of the main stream. In this way, air can be prevented from entering from the overflow pipe, and the length of the throttle channel can be made larger than the diameter of the throttle channel to prevent the inflow of air from the lower part of the tubular guide. A stable negative pressure region is secured.

  With such a configuration, it becomes possible to increase the flow rate per unit time (instantaneous maximum flow rate) by siphon phenomenon, and it is possible to improve toilet cleaning performance and contribute to water saving.

  Moreover, the guide part which concerns on this embodiment is formed so that the lower end part of the said throttle flow path part may become a substantially the same position as the outflow port of the said drainage part main body.

  Therefore, the suction of air from the outlet side of the drainage body can be prevented, and a more powerful siphon phenomenon can be caused.

  Moreover, since the guide portion does not protrude more than necessary from the drainage body, the washing water tank provided with the drainage device can easily be attached to any type of toilet.

  In addition, as a modification of the guide portion, a substantially half circumference of the lower end portion of the throttle channel portion may be formed longer than the outlet of the drainage body.

  In other words, it is a guide part formed with an extension part projecting downward from the outlet of the drainage part main body, in other words, this guide part is formed with a notch part in which the lower half part of the lower end is notched. It is.

In the case of such a guide part, when the drainage device equipped with this guide part is attached to the drainage port of the washing water tank, when the washing water tank is attached to the toilet bowl, the notch is on the front side (the bowl side of the toilet bowl). Keep it facing.
When the washing water tank is attached to the toilet bowl in this way, the washing water whose flow velocity, that is, the kinetic energy has been increased by the suction force due to the negative pressure generated in the throttle channel section, falls freely into the toilet bowl body and hits the toilet bowl in the lateral direction. Since the wash water flows out from the notch that opens to the bowl side of the toilet bowl while being blocked by the extension part, it flows out from the rim hole or jet hole formed in the toilet body to the bowl surface. As a result, filth can be transported at a smaller flow rate, and water saving can be achieved.

  Moreover, it is preferable that the gap formed between the guide part and the drainage part main body described above is formed so that the gap on the overflow pipe side is widened.

  If comprised in this way, while being able to fully exhibit the function as an overflow pipe | tube, sufficient width can be ensured also about the cross-sectional area of the flow path of washing water.

  Further, in the drainage device for toilet flushing water described above, the drain valve body can be a flapper valve rotatably supported by the overflow pipe.

  In addition, in the flapper valve, the amount of inflow from the side facing the pivot portion (usually in this type of drainage device, the pivot portion of the flapper valve is provided at the base end portion of the overflow pipe) increases. In combination with the structure of the section, it is possible to prevent separation of the cleaning water in the cleaning water flow path, and above all, the flapper valve is simple and inexpensive, and can suppress the increase in the cost of the drainage device as much as possible. .

  Furthermore, the guide portion can be subjected to a hydrophilic treatment at least from the reduced diameter portion to the throttle channel portion.

  By performing the hydrophilic treatment, water can reliably come into contact with the inner wall surface of the pipe in the throttle channel portion, and the separation of the water flow can be effectively prevented, resulting in the generation of a stronger siphon.

  By the way, it is preferable that the above-described guide portion is detachably attached to the drainage body.

  When the guide unit is attached to the cleaning water tank, an optimum guide unit can be selected and retrofitted according to the type of the tank. Moreover, even if the guide portion needs to be maintained for some reason, the work becomes easy.

  Moreover, it is preferable that the said guide part is set as the structure provided with the several leg part which protruded radially toward the drainage part main body.

  By providing the leg portion, when the guide portion is mounted in the drainage portion main body, it is easy to fit the guide portion and the drainage portion main body while maintaining a predetermined gap.

  Further, as another form of the drainage device for toilet flushing water, a wave preventing ring protruding higher than the inflow port can be provided on the outer periphery of the inflow port of the drainage body.

  This wave-breaking ring suppresses the water flow when the water in the wash water tank flows into the wash water flow path, prevents the water flow from separating in the throttle flow path portion, and can generate a powerful siphon. Also, when the drain valve body (for example, flapper valve) closes, the valve body pushes away water, but the water that is pushed away is prevented from moving by the wave-breaking ring, so the water is like a cushion. Even if the buffering function is caused and the drain valve body is sucked by the siphon, the valve does not close suddenly, and the closing sound of the drain valve body is weakened, so that the generation of noise can be effectively prevented.

  Hereinafter, embodiments of the present invention will be described more specifically with reference to the drawings. FIG. 1 is an explanatory view of a washing water tank provided with a drainage device for toilet bowl washing water according to this embodiment.

  As shown in FIG. 1, a toilet flushing water tank 1 according to the present embodiment closes a box-shaped tank body 10 capable of storing washing water 2 and an upper opening of the tank body 10. It comprises a detachable lid 11, a water supply device 3 for supplying water into the tank body 10, and a drainage mechanism 4 for supplying wash water 2 stored in the tank body 10 to a toilet (not shown). Yes.

  The water supply device 3 stores the water supplied from the water supply source in the tank body 10 and the drainage mechanism 4 supplies the stored water to the toilet as wash water.

  The water supply device 3 is erected on the left side in the tank body 10 and is provided at the upper end of the water supply pipe 30 so that the water supply pipe 30 having the lower end connected to the water supply source and the water discharge / stop water toward the tank main body 10 can be switched. The provided water supply valve 31 and the float part 32 which performs the switching operation | movement of the water discharge / water stop of the water supply valve 31 by the vertical motion according to the fluctuation | variation of the water level in the tank main body 10 are provided.

  The drainage mechanism 4 includes a drainage device 5 that forms a main part in the present embodiment attached to a drainage port 12 formed in the bottom 10a of the tank body 10, and a drainage valve body 6 that constitutes a part of the drainage device 5 (details). , Which will be described later) by an external operation, and an operation portion 40 that opens and closes, and a chain-like connecting member 42 that connects the operation portion 40 and the drain valve body 6. In addition, the material of the connection member 42 is not particularly limited, but it is preferable that the connection member 42 be light and rich in water resistance.

  In FIG. 1, reference numeral 41 denotes an operation lever constituting the operation unit 40, and one end of a rotating shaft 43 is connected to the operation lever 41 and the other end is extended substantially horizontally into the tank body 10, The connecting member 42 is suspended from the bottom. Therefore, when the rotating shaft 43 is rotated by operating the operation lever 41, the drain valve body 6 connected to the lower end of the connecting member 42 is pulled up, the upper part of the drainage device 5 is opened, and the wash water 2 is supplied to the toilet bowl. The

  Here, the drainage device 5 will be described in detail with reference to FIGS. 1 and 2 to 9. 2 is a perspective view of the drainage device, FIG. 3 is an explanatory view of the drainage device in a longitudinal sectional view, FIGS. 4A and 4B are perspective views of the guide portion, and FIG. 5A is a front view of the guide portion. FIG. 5B is a rear view thereof, FIG. 6A is a plan view thereof, FIG. 6B is a bottom view thereof, and FIG. 7A is a cross-sectional view taken along line A-A in FIG. FIG. 7B is a cross-sectional view taken along the line BB in FIG. 6B, and FIG. 8 is an explanatory view of the reduced diameter portion of the guide portion.

As shown in FIG. 1, the drainage device 5 is attached to a drainage port 12 formed in the bottom 10 a of the tank body 10. As shown in FIGS. 2 and 3, the drainage device 5 includes a synthetic resin drainage body 7 formed in a cylindrical shape having an inlet 71 and an outlet 72 for the wash water 2, and the drainage body 7. A fitting portion 74 formed at a position directly below the flange portion 73 formed at a substantially central position in the height direction is fitted to the drain port 12.
As shown in FIG. 3, the drainage body 7 has an upper half 7a formed relatively thick with the flange 73 as a boundary, an outer diameter smaller than that of the upper half 7a, and the upper half 7a. The lower half portion 7b is formed thinner than the half portion 7a. Then, a position immediately below the flange portion 73 of the lower half portion 7b is formed thick so that the fitting portion 74 is formed slightly larger than the inner diameter of the drain port 12, and as shown in FIG. Is inserted into the drain port 12, and the fitting portion 74 is fitted into the drain port 12. In FIG. 1, reference numeral 74 denotes a packing interposed between the flange portion 73 and the bottom portion 10 a of the tank body 10.

  Further, the drainage device 5 is connected to the drain valve body 6 for opening and closing the inflow port 71 of the drainage unit body 7 and the base end thereof in communication with the downstream side of the inflow port 71 of the drainage unit body 7, and the distal end is upward. The overflow pipe 51 is extended to the inside of the drainage section main body 7, and the guide section 8 is formed inside the drainage section main body 7 and guides the cleaning water from the inlet 71 to the outlet 72 of the drainage section main body 7.

  The overflow pipe 51 is integrally formed with the drainage body 7, extends temporarily from the upper part of the peripheral wall of the drainage body 7 that communicates with the base end in the horizontal direction, and the tip extends vertically upward. And the front-end | tip part of the stored water supply pipe 33 extended from the water supply apparatus 3 is penetrated by the front-end | tip part of the overflow pipe 51 (refer FIG. 1).

  As shown in FIGS. 1 to 3, the drain valve body 6 is provided with a plate-like annular valve body 62 on the abdomen side of a circular plate 61 in which the attachment portion 61 a of the connecting member 42 is formed on the back, and an overflow pipe It is comprised by the flapper valve which was able to turn up and down centering on the pivot pin 63 provided in the base end part of 51. As shown in FIG. The flapper valve has a simple structure and is inexpensive and can suppress the cost increase of the drainage device as much as possible.

In this flapper valve (drainage valve body 6), the end portion of a pivot arm 64 extended rearward from the circular plate 61 is rotatably engaged with a pivot pin 63 projecting from the overflow pipe 51. . Further, a pair of left and right wing arms 65 are extended obliquely rearward and upward with the overflow pipe 51 interposed therebetween from the left and right positions of the back surface of the circular plate 61, and a wing portion 66 is provided between the tip portions. Reference numeral 67 denotes a connecting arm connecting the pivot arm 64 and the wing arm 65.
The wing portion 66 serves as a resistor when the flapper valve rotates in the closing direction in the cleaning water 2 in the tank body 10 when the cleaning water 2 is supplied to the toilet, and maintains the open state of the inlet 71. At the end of the supply, surface tension is generated between the surface of the wing 66 and the surface of the cleaning water 2 to prevent the flapper valve from closing suddenly, thereby preventing the generation of noise.

The guide portion 8 has a characteristic configuration of the drainage device 5 according to the present embodiment, is made of synthetic resin, and forms a substantial washing water flow path.
That is, as shown in FIGS. 3 to 8, the guide portion 8 is formed in the same shape as the inflow port 71 of the drainage body 7, and downward from the upper end opening 8 a that functions as the valve seat of the drainage valve body 6. The diameter is reduced gradually and gradually toward the inner surface of the drainage body 7, and a reduced diameter part 81 is formed between the inner surface of the drainage part main body 7. The throttle channel portion 82 is continuously formed to form a lower end opening 8b, and the length dimension H of the throttle channel portion 82 is larger than the diameter W of the throttle channel portion 82. is doing.

  Accordingly, when the cleaning water 2 flows into a location corresponding to the inlet 71 of the drainage body 7, the reduced diameter portion 81 is formed at a corresponding portion of the guide portion 8, and thus flows into the inner surface of the guide portion 8. Separation is prevented as much as possible from the generated washing water 2, and the occurrence of contraction can be prevented. The shape of the reduced diameter portion 81 will be described in detail later.

  Further, as shown in FIG. 3B, an overflow water channel 52 communicating with the communication port 51a of the overflow pipe 51 formed in the drainage body 7 and the washing water channel (in the guide unit 8) are partitioned. Therefore, the negative pressure region generated in the washing water channel is not destroyed by the air entering from the overflow pipe 51, and the flow rate per unit time of the washing water 2 can be increased by the siphon phenomenon. .

  In particular, as illustrated, a gap D formed between the guide portion 8 and the drainage portion main body 7 widens the gap on the overflow pipe 51 side.

  Therefore, the overflow pipe 51 can sufficiently exhibit the function as the overflow pipe 51 and can secure a sufficient width for the cross-sectional area of the washing water flow path formed in the guide portion 8. It can be secured sufficiently.

  In addition, since the length of the throttle channel portion 82 of the guide portion 8 is made larger than the diameter of the throttle channel portion 82, the flow velocity is further increased and the instantaneous maximum flow rate is increased. FIG. 9 shows a change in water flow due to a difference in the relationship between the length dimension H and the diameter W of the throttle channel portion 82. 9A shows a case where W >> H, FIG. 9B shows a case where W> H, and FIG. 9C shows a case where W ≦ H.

  As shown in FIG. 9A, if the vertical length H of the throttle channel portion 82 is too short compared to the diameter W, air easily flows from the lower end opening 8b of the guide portion 8, and the “negative pressure region” "Cannot be formed, the siphon is not generated, and the instantaneous maximum flow rate of the cleaning water 2 does not increase.

  As shown in FIG. 9B, when the longitudinal length H of the throttle channel portion 82 is slightly shorter than the diameter W, even if the “negative pressure region” is formed, the guide portion 8 is also formed. Since the air tends to flow in from the lower end opening 8b, the “negative pressure region” disappears and the continuous stable siphon phenomenon cannot be maintained, resulting in an increase in the instantaneous maximum flow rate of the cleaning water 2. It is difficult.

  FIG. 9C shows a case where the longitudinal length H of the throttle channel portion 82 is longer than the diameter W, similarly to the guide portion 8 of the present embodiment, and due to the Coanda effect in the throttle channel portion 82. Since the washing water 2 flows in a state of being in firm contact with the flow path wall surface, the amount of drainage increases. In addition, in the vertically long flow path (pipe), the washing water 2 is accelerated by natural fall to increase the flow velocity, and the inflow of air from the lower end opening 8b of the guide portion 8 is also prevented. Therefore, the “negative pressure region” is stably generated, and the suction amount is reduced to increase the water supply amount (drainage amount). Therefore, the siphon phenomenon is stably maintained, and the instantaneous maximum flow rate of the cleaning water 2 is greatly increased. become.

  In addition, the guide portion 8 according to the present embodiment is formed so that the lower end portion of the throttle channel portion 82 is substantially at the same position as the outlet 72 of the drainage body 7.

  Therefore, the guide portion 8 does not protrude more than necessary from the lower end of the drainage body 7, and the washing water tank 1 provided with the drainage device 5 according to this embodiment can be easily attached to any type of toilet. .

  As shown in FIGS. 4 to 7, the guide portion 8 is integrally formed with a plurality of legs 83 projecting radially toward the drainage body 7.

  The interval between the adjacent leg portions 83, 83 may be appropriately determined. When the guide portion 8 is mounted in the drainage body 7 by providing these legs 83, the guide portion 8 and the drainage body 7 It becomes easy to insert while maintaining a predetermined gap D. In the inserted state, the tip of the leg 83 abuts against the inner peripheral wall surface of the drainage body 7, and the guide 8 can be firmly held in the drainage body 7 while maintaining the desired gap D. .

Here, the shape of the reduced diameter portion 81 of the guide portion 8 will be described.
As shown in FIG. 3 (b), the inflow amount of the cleaning water 2 into the guide portion 8 is that the distance from the overflow pipe 51 from the side separated from the overflow pipe 51 from the structure of the drain valve body 6 and its mounting structure. More than the adjacent side (when the drain valve body 6 pivots upward about the pivot pin 63, the opening area on the side facing the overflow pipe 51 becomes larger). Therefore, it has been experimentally found that the separation of the water flow is likely to occur on the peripheral surface on the side separated from the overflow pipe 51 in the guide portion 8 (wash water flow path).

  Therefore, in the present embodiment, the diameter-reduced portion 81 of the guide portion 8 is abruptly increased from a large curvature when the diameter is smoothly and gradually reduced downward from the upper end opening 8a on the side away from the overflow pipe 51. The curvature is made smaller, and the curvature is gradually reduced to be linear. Therefore, the wash water 2 flowing in from the lateral direction with respect to the upper end opening 8a flows along the peripheral wall surface, so that separation of the water flow in the vicinity of the upper end of the guide portion 8 is prevented, and further along the peripheral wall surface. The washing water 2 that has flowed in is formed so that it can fall freely along the peripheral wall surface.

  Specifically, the reduced diameter portion 81 has a characteristic curved surface as shown in FIG. This is determined through experiments, and as shown in the drawing, the peripheral surface of the reduced diameter portion 81 of the guide portion 8 first has a start end side of the upper end opening portion 8a with respect to the reference horizontal line a. The angle between the curved line and the horizontal line a is gradually changed so as to gradually decrease toward the peripheral surface of the vertical throttle channel portion 82. For example, in FIG. The circumferential surface of the vertical restricting channel portion 82 is connected with a sharply reduced curvature so as to be 45 degrees, and thereafter gradually reduced to a straight line with gradually decreasing curvatures of 65 degrees, 75 degrees, and 85 degrees. It is tied smoothly.

  As described above, the reduced diameter portion 81 of the guide portion 8 in the present embodiment can effectively prevent the separation of the water flow by causing the Coanda effect on the side away from the overflow pipe 51, as described above. In addition, the shape contributes to an increase in the instantaneous maximum flow rate of the cleaning water 2.

  Further, as a modified example of the guide portion 8, water can be reliably in contact with the inner wall surface in the throttle channel portion 82, and the separation of the water flow can be more effectively prevented to generate a stronger siphon. As can be done, the inner peripheral wall of the guide portion 8 can be subjected to a hydrophilic treatment between the reduced diameter portion 81 and the throttle channel portion 82. As the hydrophilic treatment, coating with a material exhibiting hydrophilicity can be considered.

10 to 12 show further modifications of the guide portion 8.
In this configuration, a substantially half circumference of the lower end portion of the throttle channel portion 82 is formed longer than the outlet 72 of the drainage body 7.

  That is, as shown in FIG. 11, the extension part 84 which protruded below rather than the outflow port 72 of the drainage part main body 7 is formed. In other words, as shown in FIG. 10, it can be said that the notch portion 85 is formed by notching the lower half circumference portion of the guide portion 8. In FIG. 11, reference numeral 91 denotes a water supply passage formed in the toilet bowl 9, and the wash water 2 from the wash water tank 1 flows out into the bowl 90 through the water supply passage 91 as shown in FIG. 12.

  When the guide portion 8 having such an extension portion 84 (or notch portion 85) is used, when the drainage device 5 equipped with the guide portion 8 is attached to the drainage port 12 of the cleaning water tank 1, as shown in FIG. In addition, when the flush water tank 1 is attached to the toilet bowl 9, the cutout portion 85 faces the front side (the bowl 90 side of the toilet bowl 9).

  When the wash water tank 1 is attached to the toilet bowl 9 in this manner, the wash water 2 whose flow velocity, that is, kinetic energy has been increased by the suction force generated by the negative pressure generated in the throttle flow path portion 82 is in the toilet body, that is, the water supply channel 91. When the water falls freely and is changed into a lateral flow toward the rim water passage 92 or the like by hitting the water supply passage 91, the wash water 2 is blocked by the extension portion 84 and opened to the bowl 90 side of the toilet 9. Since the water flows out while maintaining the water pressure from 85, for example, it flows down to the bowl 90 from a rim hole or a jet hole (not shown) formed in the toilet bowl 9, so that filth can be transported at a smaller flow rate, thereby saving water. It becomes possible.

  The above-described drainage device 5 that has been described including the modification can be configured to further include a wave preventing ring 55. FIG. 13 is a perspective view of the drainage device 5 provided with the wave preventing ring, and FIG. 14 is an explanatory view showing a drainage state of the cleaning water by the drainage device provided with the wave preventing ring.

The wave preventing ring 55 is made of a synthetic resin, and has a lower peripheral wall 55a whose inner diameter is in close contact with the outer periphery of the drainage body 7 and an upper side that is larger in diameter than the lower peripheral wall 55a and extends upward from the lower peripheral wall 55a. It is comprised from the substantially cylindrical body which has the surrounding wall 55b.
When the lower peripheral wall 55 a is placed on the outer periphery of the inlet 71 of the drainage body 7 so as to be placed on the flange 73 of the drainage body 7, the upper end 55 c is higher than the inlet 71. The height dimension is determined so that it protrudes.

  The drainage operation by the drainage device 5 provided with such a wave preventing ring 55 will be described with reference to FIG. When the operation lever 41 (see FIGS. 1 and 11) is operated, the drain valve body 6 rotates upward, and the upper end opening 8a of the guide portion 8 that overlaps with the inflow port 71 of the drain portion main body 7 is largely opened to perform cleaning. Water 2 flows in as shown by the arrow (FIG. 14 (a)).

  At this time, the water flow at the time when the cleaning water 2 flows into the guide portion 8 serving as the cleaning water flow path is suppressed by the wave preventing ring 55 whose upper end portion 55c is higher than the inlet 71 (the upper end opening 8a of the guide portion 8). It is done. In addition, as described above, the diameter-reduced portion 81 of the guide portion 8 has a characteristic curved surface. Therefore, the provision of the wave preventing ring 55 can more effectively prevent the water flow from separating in the flow path. As a result, it is possible to increase the instantaneous maximum flow rate of the cleaning water 2 by generating a powerful siphon. That is, since the filth can be conveyed even with a small amount of the washing water 2, the water saving effect is enhanced.

As the flush water 2 is supplied to the toilet bowl 9 (see FIG. 12) and the water level of the flush water 2 in the tank body 10 decreases, the drain valve body 6 rotates in the closing direction (FIG. 14B). ).
At this time, the drain valve body 6 tries to push away the water, but the movement of the water to be pushed away is blocked by the wave preventing ring 55, and the water causes a buffer function as if it were a cushion.
Therefore, even if the drain valve body 6 is sucked to the drain part main body 7 side by the negative pressure due to the siphon phenomenon, the drain valve body 6 is not completely closed as shown in FIG. 14 (c). At that time, the closing sound is weakened, and noise generation is effectively prevented.

  Thus, the wave preventing ring 55 generates a powerful siphon in the drainage device 5 to increase the instantaneous maximum flow rate of the washing water 2 and contribute to water saving, and also weakens the closing sound of the drainage valve body 6. Therefore, it is a useful member that also has the effect of preventing noise.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to each embodiment mentioned above, In the range of the summary of this invention described in the claim, various deformation | transformation are carried out.・ Change is possible.

  The effects described in the present embodiment are only the most preferable effects resulting from the present invention, and the effects according to the present invention are not limited to those described in the embodiments.

It is explanatory drawing of the washing water tank which comprises the drainage device for toilet bowl washing water concerning this embodiment. It is a perspective view of the drainage device. It is explanatory drawing by the longitudinal cross-sectional view of the drainage device. It is a perspective view of a guide part. (A) is a front view of a guide part, (b) is the same rear view. (A) is a top view of the guide part, (b) is the bottom view. (A) is AA sectional drawing of Fig.6 (a), (b) is BB sectional drawing of FIG.6 (b). It is explanatory drawing of the reduced diameter part of the guide part. It is explanatory drawing which shows the change of the water flow by the difference in the relationship between the length dimension of a throttle flow path part, and a diameter. It is a perspective view which shows the modification of a guide part. It is explanatory drawing which shows the modification of the guide part. It is explanatory drawing which shows the modification of the guide part. It is a perspective view of a drainage device provided with a wave-breaking ring. It is explanatory drawing which shows the drainage state of the wash water by the drainage device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Washing water tank 2 Washing water 5 Drainage device 6 Drainage valve body 7 Drainage part main body 8 Guide part 12 Drainage port 51 Overflow pipe 55 Breakwater ring 71 Inlet 72 Outlet 81 Reduced diameter part 82 Restriction channel part D Gap H Length Size W Diameter

Claims (9)

In the drainage device attached to the drain of the washing water tank for storing the washing water for washing the toilet bowl,
A drainage body having an inlet and an outlet for washing water, and attached to the drain;
A drain valve body for opening and closing the inlet,
An overflow pipe in which the base end is connected to the downstream side of the inflow port of the drainage body, and the tip is extended upward;
A guide portion that is formed inside the drainage body and guides wash water from the inlet to the outlet;
With
The guide portion is
A diameter-reduced portion that is gradually and gradually reduced in diameter downward, forming a gap with the inner surface of the drainage body, and a cross-section of the flow path is substantially constant vertically downward from the reduced-diameter portion. A drainage device for toilet flushing water, characterized by having a throttle channel portion formed continuously and having a length dimension of the throttle channel portion larger than the diameter of the throttle channel portion. The guide portion is
The drainage device for toilet flushing water according to claim 1, wherein a lower end portion of the throttle channel portion is formed so as to be substantially in the same position as an outlet of the drainage body. The guide portion is
The drainage device for toilet flushing water according to claim 1, wherein a substantially half circumference of a lower end portion of the throttle channel portion is formed longer than an outlet of the drainage body. The gap formed between the guide portion and the drainage body is:
The drainage device for toilet flush water according to any one of claims 1 to 3, wherein a gap on the overflow pipe side is widened. The drain valve body is
The drainage device for toilet flushing water according to any one of claims 1 to 4, wherein the drainage device is a flapper valve rotatably supported by the overflow pipe. The guide portion is
The drainage device for toilet flushing water according to any one of claims 1 to 5, wherein a hydrophilic treatment is performed at least from the reduced diameter portion to the throttle channel portion. The guide portion is
The drainage device for toilet flushing water according to any one of claims 1 to 6, wherein the drainage device is detachably attached to the drainage body. The guide portion is
The drainage device for toilet flushing water according to any one of claims 1 to 7, further comprising a plurality of legs projecting radially toward the drainage body.   The drainage device for toilet flushing water according to any one of claims 1 to 8, wherein a wave-proof ring protruding higher than the inlet is provided on an outer periphery of the inlet of the drainage body. .

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