JP2013076300A - Flow channel opening/closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow channel opening/closing device for supplying washing water to a closet bowl, capable of maintaining a water quantity to be substantially constant regardless of water supply pressure when washing water is supplied to the closet bowl, while suppressing variations with the passage of time of the water supply pressure during a period of time from starting of valve closing to completion of the valve closing, and keeping also a quantity of refill water supplied to the closet bowl side to be a required quantity within a definite range.SOLUTION: A flow channel opening/closing device comprises: refill water quantity adjustment means for suppressing variations of supplied refill water quantity depending on a water supply pressure by adjusting forwarding operation of a valve body member according to the water supply pressure from a primary side flow channel in a refill water supply step; and refill water flow rate holding means for suppressing variations with the passage of time of an instantaneous flow rate of the refill water to be constant in the refill water supply step.

Description

  The present invention relates to a flow path opening / closing device that supplies cleaning water to a toilet.

  As means for supplying cleaning water to a toilet bowl, it is widely performed to provide a flow path opening / closing device such as a flash valve in a water supply channel. The flush valve has an inlet that receives water from the primary flow path that is the water supply source and sends it to the primary internal flow path, and an outlet that sends water from the secondary side internal flow path to the secondary flow path that is the water supply destination And a main valve that opens and closes the flow path between the primary side internal flow path and the secondary side internal flow path, and the primary side internal flow path and the secondary side without using the main valve. A bypass channel communicating with the internal channel and a sub-valve for opening and closing the bypass channel are provided.

  When the flush valve configured as described above performs an operation of opening the sub-valve such as depressing the operation lever, the bypass passage is opened and the back pressure of the main valve body constituting the main valve is reduced, and the primary side internal flow is reduced. The main valve body is pushed up by the primary pressure (feed water pressure) in the passage so as to be separated from the main valve seat, the main valve is opened, and water flows out from the outlet to the secondary side flow path. Thereafter, when the sub valve is closed such as returning the operation lever, or when the operation lever is automatically returned and the sub valve is closed, the bypass flow path is closed and the back pressure of the main valve body increases. As the back pressure of the main valve body increases, the main valve body descends so as to approach the main valve seat, and the main valve closes as the main valve body comes into contact with the main valve seat. Therefore, the flush valve receives an instruction to start water supply, the main valve body is pulled away from the main valve seat so that the opening degree is constant, water supply to the toilet is started, and autonomously by satisfying a predetermined condition It functions as a flow path opening / closing device that stops water supply.

  There are places where the flush valve is installed, where the feed water pressure is high and in some places where the feed water pressure is low. The structure of the conventional flush valve has a constant position of the main valve body when the sub valve is opened, regardless of the level of the feed water pressure. There was a problem that. When installing the flush valve, the stop cock is adjusted on site to adjust the water supply.

  However, when a construction worker turns the stop cock at the site and adjusts the amount of water supplied, the amount of adjustment often varies depending on the individual site, and the amount of water supplied to the toilet may not necessarily be appropriate. Therefore, in the flush valve described in Patent Document 1 below, ascending position restricting means for restricting the ascending position of the main valve body, a pressure sensor for detecting the supply water pressure, and an ascending position restricting means according to the water pressure measurement value of the pressure sensor. And a control means for adjusting the amount of rise restriction of the main valve body.

JP-A-6-336753

  In the flash valve described in Patent Document 1, the control means drives the motor according to the detected pressure of the pressure sensor, and adjusts the ascending position restricting means to a position according to the water supply pressure. Therefore, even if the supply water pressure fluctuates, the amount of water flowing to the toilet can be controlled to be constant. In this way, waste water can be reduced by making the amount of water flowing to the toilet side constant regardless of whether the supply water pressure is high or low.

  By the way, the flush valve can be attached to both a urinal and a urinal. In the urinal, a sealed portion is formed below the bowl portion that receives the urine. When washing the urinal, if washing water is poured into the bowl part, the washing water flows into the sealed water part after washing the bowl part, and the washing is completed by replacing the water stored in the sealed water part. Therefore, when a flush valve is attached to supply water to the urinal, it is possible to enjoy the effect of reducing wasted water by making the amount of water flowing to the toilet side constant.

  In particular, the siphon system (including systems that use other siphon phenomena such as the siphon-zette system) has a water-sealed part under the bowl that receives stool and urine, and the downstream pipe is bent from the water-sealed part. This is a method of sucking and discharging filth by causing a siphon phenomenon during cleaning. When washing siphon-type toilets, if washing water is poured into the bowl, the sealing water and the pipes before and after the flushing water are filled with the washing water, and then the filth is surely flushed by the suction effect of the siphon phenomenon. ing. When this suction effect occurs, the water in the sealed portion and the pipes before and after the sealed portion are sucked and flown, so that there is no accumulated water in the sealed portion. In view of this, replenished water is replenished to the sealed water portion after washing, and the water replenished as the reserved water is also called refilled water. Unlike the flush toilet bowl, the present inventors cannot enjoy the waste water reduction effect with the conventional flush valve due to the characteristics of the refill water in the siphon system using the siphon phenomenon. It was discovered.

  The flush valve described in Patent Document 1 makes the instantaneous flow rate flowing to the toilet side constant regardless of whether the supply water pressure is high or low, so the lift amount of the valve body with respect to the valve seat is set to the supply water pressure. Fluctuate accordingly. More specifically, the degree of restraint of the lift amount is increased more than the state where the lift amount is not adjusted at high water pressure, and the lift amount is adjusted to be smaller than the water pressure. On the other hand, when the water pressure is low, the lift amount corresponding to the water pressure is adjusted by reducing the suppression of the lift amount. By adjusting the lift amount according to the supply water pressure in this way, the instantaneous flow rate of cleaning water is suppressed from rising at high water pressure, and the instantaneous flow rate of cleaning water is maintained and ensured at low water pressure. The device is designed to keep the flow rate constant.

  In this way, in order to keep the instantaneous flow rate constant, the degree of restraint of the lift amount is increased at high water pressure, and the degree of restraint of the lift amount is decreased at low water pressure, so that the valve closing is completed after starting the valve closing. The distance until the valve body comes into close contact with the valve seat becomes a relatively short distance if the feed water pressure is high, and a relatively long distance if the feed water pressure is low. Therefore, although the conventional flush valve can keep the amount of water flowing to the toilet side constant regardless of the water supply pressure while the valve body is separated from the valve seat to allow the washing water to flow, it closes after the valve starts to close. The amount of water that flows before the valve is completed varies depending on the feed water pressure.

  Since the refill water in the toilet bowl is for replenishing the retained water in the sealed water portion after washing, the water flowing from the start of the flush valve to the completion of the valve closing is used as the refill water. Therefore, if the water flowing from the start of valve closing to the completion of valve closing varies like the conventional flush valve due to the water supply pressure, the amount of refilled water will vary, which will Some kind of countermeasure is required. When the feed water pressure is high, the distance from the start of closing the valve to the completion of the valve closing is relatively short, so if the feed water pressure is high, refilling is performed when the feed water pressure is low. Water below the amount of water required as water is supplied, and waste water is generated. On the other hand, when the feed water pressure is low, the distance from the start of closing the valve to the completion of the valve closing is relatively long. Therefore, if the feed water pressure is low, the feed water pressure is low. More water than the amount necessary for refill water is supplied to the water, and there is a possibility that the sealed water will run out.

  Accordingly, the present inventors have provided a valve body of a main valve that opens and closes a flow path and a constant flow valve that adjusts an instantaneous flow rate of cleaning water in order to supply a predetermined amount of cleaning water independent of a supply water pressure to the toilet. The valve body is integrated into a single valve body member, and attention is paid to providing a position control member that moves along the sliding direction of the valve body member so as to adjust the movable amount of the valve body member. . This position control member moves according to the water supply pressure and adjusts its position. Therefore, in the above configuration, the position control member moves according to the water supply pressure, and the movable amount of the valve body member, that is, the opening degree is adjusted. As a result, the amount of cleaning water supplied can be suppressed without depending on the level of the water supply pressure in the environment where the flash valve is installed.

  On the other hand, when the instantaneous flow rate of refilled water fluctuates as the valve body member moves forward, a new problem has arisen in that the feed water pressure in the primary side internal flow path fluctuates with time. . This is considered to be because the head of the pump that generates the feed water pressure fluctuates due to fluctuations in the flow rate passing through the flash valve. As a result, the water supply pressure in the primary side internal flow path not only varies depending on the installation location of the flash valve, but also varies over time at the same installation location.

  FIG. 14 shows the relationship between the instantaneous flow rate of water passing through the flash valve and the feed water pressure in the primary side internal flow path. FIG. 14 shows a state in which the water supply pressure decreases as the instantaneous flow rate increases for three flash valves at different installation locations. Thus, how the feed water pressure fluctuates with the fluctuation of the instantaneous flow rate of the refill water varies depending on the source of the feed water pressure (type of pump, etc.), the shape of the piping, and the like.

  If the supply water pressure at the time of refill water supply fluctuates, the position control member adjusted according to the supply water pressure will be affected and the position will change. For this reason, as a result of the position of the valve body member changing, the supply amount of the refill water also changes. For this reason, in order to supply a predetermined amount of refilled water that does not depend on the supply water pressure to the toilet, in addition to the above-described configuration, it is necessary to suppress fluctuations in the supply water pressure over time and keep it constant. is there.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a flow path opening / closing device that supplies flush water to a toilet, and when supplying wash water to the toilet, The amount of refill water supplied to the urinal is also suppressed by suppressing fluctuations in the water supply pressure over time between the start of valve closing and the completion of valve closing. An object of the present invention is to provide a flow path opening / closing device capable of maintaining a required water amount within a certain range.

  In order to solve the above problems, a flow path opening / closing apparatus according to the present invention starts water supply to a toilet by receiving an instruction to start water supply, and automatically stops water supply by satisfying a predetermined condition A main valve having a main valve body and a main valve seat for opening and closing a flow path between a primary flow path connected to a water supply source and a secondary flow path connected to a toilet that is a water supply destination; A constant flow valve having a constant flow valve body and a constant flow valve seat for adjusting a cross-sectional area formed between the primary flow path and the secondary flow path so as to keep a constant instantaneous flow rate of water flowing from the primary flow path to the secondary flow path A valve body member, and the main valve body and the constant flow valve body are formed as an integrated valve body member, and the main valve is configured to adjust a movable amount of the valve body member. And a position control member that moves along the sliding direction of the primary control side. The position is adjusted according to the water pressure of the path, and when the water pressure of the primary side flow path increases, the position control member is configured to move in a direction to narrow the movable amount of the valve body member, In the wash water supply stage for supplying wash water for washing the toilet to the toilet, the valve body member is driven in the backward direction to separate the main valve body from the main valve seat. While supplying wash water to the secondary flow path and adjusting the cross-sectional area of the flow path, the instantaneous flow rate of the wash water is kept constant, while the refill water for forming the sealing water of the toilet is In the refill water supply stage for supplying to the toilet, the main valve body is brought into contact with the main valve seat by driving the valve body member in the forward direction, and in the refill water supply stage, the primary side According to the water supply pressure from the flow path, the valve body member By adjusting the advance operation, the refill water amount adjusting means for suppressing the amount of supplied refill water from fluctuating depending on the feed water pressure, and in the refill water supply stage, the instantaneous flow rate of the refill water is changed over time. Refill water flow rate holding means that suppresses fluctuations and keeps them constant.

  According to the present invention, the main valve element for opening and closing the flow path between the primary flow path and the secondary flow path, and the instantaneous flow rate of water flowing from the primary flow path to the secondary flow path are constant. The constant flow valve body is maintained as an integrated valve body member, so that the instantaneous flow rate of water supplied to the toilet is not changed due to fluctuations in the supply water pressure, and the flow rate is compact. A road opening and closing device can be provided. In the washing water supply stage for supplying washing water to the toilet, the instantaneous flow rate of the washing water is kept constant by adjusting the cross-sectional area of the flow path formed between the constant flow valve body and the constant flow valve seat. Since it is comprised, the water supply which kept the instantaneous flow volume constant can be performed reliably by adjusting the relative position of a valve body member. As described above, when the relative position of the valve body member is adjusted according to the supply water pressure, when the supply of the washing water is finished and the valve closing operation is started, the refill water for forming the sealing water of the toilet bowl Cannot be stably supplied. Specifically, the main valve body and constant flow valve body are adjusted so that they are difficult to separate from the main valve seat and constant flow valve seat at high water pressure, and the main valve body and constant flow valve body are at main valve at low water pressure. Since adjustment is made so as to be easily separated from the seat and the constant flow valve seat, there is a possibility that the refill water is insufficient at high water pressure, or there is a possibility that the refill water is excessive at low water pressure.

  Accordingly, in the present invention, in the refill water supply stage for supplying the refill water for forming the sealing water of the toilet bowl to the toilet bowl, the forward movement operation of the valve body member is adjusted according to the water supply pressure from the primary channel. Thus, refill water amount adjusting means for suppressing fluctuation of the amount of supplied refill water depending on the supply water pressure is provided. The degree of proximity of the main valve body to the main valve seat and the degree of proximity of the constant flow valve body to the constant flow valve seat are adjusted by adjusting the forward movement of the valve body member according to the supply water pressure from the primary side flow path. It is possible to suppress the amount of refill water to be supplied from fluctuating depending on the level of the water supply pressure.

  Furthermore, the present invention includes refill water flow rate holding means that suppresses fluctuation of the instantaneous flow rate of refill water over time and keeps it constant in the refill water supply stage. By suppressing the temporal change in the instantaneous flow rate of the refill water, the supply water pressure is not changed over time in the refill water supply stage and is kept constant. In other words, the feed water pressure only varies depending on the location where the flow path opening / closing device is installed, and becomes constant over time. As a result, the amount of supplied refill water can be kept constant without depending on the water supply pressure by the water amount adjusting means.

  In the flow path opening / closing apparatus according to the present invention, it is also preferable that the flow path opening / closing apparatus is connected to a siphon type toilet. In siphon-type toilets, when the toilet is washed, the water in the sealed portion is once lost, and therefore it is necessary to supplement a large amount of water after washing. For this reason, the effect of the present invention of keeping the amount of supplied refill water constant is particularly remarkable.

  In the flow path opening / closing apparatus according to the present invention, the refill water flow rate holding means suppresses fluctuations in the flow path cross-sectional area of the flow path to which the refill water is supplied due to driving of the valve body member. Is also preferable.

  In this preferable aspect, the flow path cross-sectional area of the flow path to which the refill water is supplied is suppressed from fluctuating even if the valve body member is driven (even if the valve body member moves forward). For this reason, the instantaneous flow rate of the refill water can be reliably made constant only by devising the shape of the flow path without requiring complicated valve control or the like.

  In the flow path opening / closing apparatus according to the present invention, a main flow path and a sub flow path provided separately from the main flow path are provided as flow paths for supplying wash water to the toilet, and the refill water In the supply stage, it is also preferable that the refill water does not pass through the main channel and is supplied only from the sub channel.

  In the cleaning water supply stage, it is necessary to adjust the instantaneous flow rate of the cleaning water according to the cross-sectional area of the flow path formed between the constant flow valve body and the constant flow valve seat. For this reason, it has the structure from which a flow-path cross-sectional area fluctuates with the drive of a valve body member. However, this configuration affects the instantaneous flow rate of the refill water in the refill water supply stage, and there is a possibility that the instantaneous flow rate of the refill water varies as the valve body member is driven. Therefore, in this preferred embodiment, two flow paths, a main flow path and a sub flow path, are provided as flow paths for supplying wash water to the toilet, and the refill water does not pass through the main flow path but from the sub flow path. Only to be supplied. In other words, the configuration in which the flow path cross-sectional area varies by driving the valve body member is provided only on the main flow path side, and the sub-flow path is configured such that the flow path cross-sectional area does not vary by driving the valve body member. For this reason, in the refill water supply stage, the influence which it receives from the structure of the main flow path can be completely eliminated, and the instantaneous flow rate of the refill water can be made constant.

  In the flow path opening / closing apparatus according to the present invention, it is also preferable that the sub flow path is provided in the valve body member.

  At the time when the refill water supply stage is completed, it is necessary to close the sub-flow path in order to stop the refill water supply. In this preferred embodiment, since the auxiliary flow path is provided in the valve body member, the auxiliary flow path is also closed when the main valve element comes into contact with the main valve seat. That is, it is possible to close the auxiliary flow path with a simple configuration without enlarging the shape of the existing valve body and closing the auxiliary flow path, or providing a separate valve element for closing the auxiliary flow path. .

  According to the present invention, there is provided a flow path opening / closing device for supplying cleaning water to a toilet, and when supplying cleaning water to a toilet, the amount of water can be kept substantially constant regardless of the supply water pressure, while the valve is closed. The flow of refill water to be supplied to the toilet is kept at a required amount within a certain range by suppressing fluctuations in the water supply pressure over time from the start of the valve to completion of valve closing. A road opening and closing device can be provided.

It is an external view which shows the state which attached the flush valve which is embodiment of this invention to the water supply pipe to a toilet bowl. It is a schematic block diagram which shows typically the internal structure of the flash valve which is 1st embodiment of this invention. It is a side view which shows the constant flow valve body of the flash valve shown in FIG. It is a perspective view which shows the constant flow valve body of the flash valve shown in FIG. It is a figure which shows the water discharging operation | movement of the flash valve shown in FIG. It is a figure which shows the water discharging operation | movement of the flash valve shown in FIG. It is a figure which shows the water discharging operation | movement of the flash valve shown in FIG. It is a figure which shows the water discharging operation | movement of the flash valve shown in FIG. It is a figure which shows the water discharging operation | movement of the flash valve shown in FIG. It is a schematic block diagram which shows typically the internal structure of the flash valve which is 2nd embodiment of this invention. It is a side view which shows the constant flow valve body 44a of the flash valve shown in FIG. It is a perspective view which shows the constant flow valve body 44a of the flash valve shown in FIG. It is a figure for demonstrating the water discharging operation | movement of the flash valve shown in FIG. It is a figure which shows the relationship between feed water pressure and instantaneous flow volume.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  FIG. 1 shows a flash valve (flow path opening / closing device) according to an embodiment of the present invention. FIG. 1 is an external view showing a state in which a flush valve according to an embodiment of the present invention is attached to a water supply pipe to a toilet. As shown in FIG. 1, the flash valve SV (flow path opening / closing device) is attached in the middle of the water supply pipe TB to the toilet bowl SB. Upon receiving an instruction to start water supply, the flash valve SV opens a flow path through the water supply pipe TB and starts water supply to the toilet SB. Thereafter, the flash valve SV autonomously closes the flow path and stops water supply by satisfying a predetermined condition.

  The toilet bowl SB is provided with a sealing part SW. The sealed water SW is always filled with water to form a sealed water. If the toilet bowl SB is used, filth will be thrown into the sealing part SW. When the flush valve SV is operated after using the toilet bowl SB, washing water is supplied from the flush valve SV at a substantially constant instantaneous flow rate. By this washing water, the accumulated water and filth in the sealed water portion SW are poured. In the case of this embodiment, since the toilet bowl SB is a siphon type toilet bowl, the wash water is sucked downstream along with the filth by the siphon phenomenon. The flush valve SV of the present embodiment is configured to supply refilled water to the sealing portion SW after cleaning.

  The flash valve SV includes a main body 10 and an electromagnetic valve 82. In the main body part 10, a primary side internal flow path 20 connected to the water supply pipe TB and a secondary side internal flow path 30 connected to the toilet SB are formed. A valve body member 40 is disposed in the main body 10. The valve body member 40 opens and closes the flow path between the primary side internal flow path 20 and the secondary side internal flow path 30. The electromagnetic valve 82 is provided in the bypass flow path 80. By opening the electromagnetic valve 82, the back pressure of the valve body member 40 is lowered and the valve is opened. In the present embodiment, in the water supply pipe TB, a stop cock V is located upstream of the flush valve SV, a vacuum breaker VB is located downstream of the flush valve SV and upstream of the toilet SB. Has been placed.

  Next, the internal structure of the flash valve SV according to the first embodiment of the present invention will be described with reference to FIG. FIG. 2 is a schematic configuration diagram schematically showing the internal structure of the flash valve SV.

  As shown in FIG. 2, the flash valve SV includes a main body 10. A primary side internal flow path 20, a secondary side internal flow path 30, a back pressure chamber 14, and a secondary back pressure chamber 12 are formed inside the main body 10. The primary side internal flow path 20 receives inflow water Wa from the primary side flow path (flow path upstream of the flush valve SV of the water supply pipe TB shown in FIG. 1) that is a water supply source, and receives the secondary side internal flow path. It flows out toward 30. An inlet 21 is provided at the upstream end of the primary side internal flow path 20. The inflow port 21 is an opening that receives the incoming water Wa and sends it out to the primary side internal flow path 20.

  The secondary-side internal flow path 30 converts the water flowing from the primary-side internal flow path 20 into a secondary-side flow path (a flow path downstream of the flush valve SV of the water supply tube TB shown in FIG. 1). This is to be discharged as the outflow water Wb. An outlet 31 is provided at the downstream end of the secondary side internal flow path 30. The outflow port 31 is an opening that sends out the effluent water Wb from the secondary side internal flow path 30 to the secondary side flow path.

  A valve body member 40 is disposed between the primary side internal flow path 20 and the secondary side internal flow path 30. The valve body member 40 is arranged such that one end on the downstream side is inserted into the secondary side internal flow path 30 and the other end on the opposite side faces the back pressure chamber 14. The valve body member 40 is disposed so as to freely advance and retract along the downstream direction of the secondary side internal flow path 30. The valve body member 40 is composed of a main valve body 42 provided in the upper part thereof and a constant flow valve body 44 provided in the lower part thereof, and both are integrally formed.

  The main valve body 42 is for opening and closing the flow path between the primary side internal flow path 20 and the secondary side internal flow path 30. The main valve body 42 has a main valve body surface 421 on the downstream surface. When the valve body member 40 is pushed most downstream, the main valve body surface 421 contacts the boundary surface of the primary side internal flow path 20 with respect to the secondary side internal flow path 30, and the primary side internal flow path 20 and the secondary side internal flow path It is comprised so that the distribution | circulation of the water between the flow paths 30 may be interrupted | blocked. Therefore, the boundary surface with which the main valve body surface 421 abuts functions as the main valve seat surface 201 (main valve seat).

  The constant flow valve body 44 is for adjusting the instantaneous flow rate of water flowing from the primary side internal flow path 20 to the secondary side internal flow path 30. The constant flow valve body 44 has a valve inner space 445 which is a space formed inside. In addition, a hole 444 that communicates the secondary side internal flow path 30 and the valve internal space 445 is formed on the bottom surface of the constant flow valve body 44. The constant flow valve body 44 also has a slit 442 formed in a groove shape on the outer surface 441 thereof. Furthermore, a hole 443 that communicates the outside with the valve space 445 is formed in the upper portion of the slit 442.

  The structure of the constant flow valve body 44 will be described in detail with reference to FIGS. FIG. 3 is a side view of the constant flow valve body 44, and FIG. 4 is a perspective view of the constant flow valve body 44. Four slits 442 are formed at equal intervals on the outer surface 441 of the constant flow valve body 44. Each slit 442 is a bottomed groove having a rectangular cross section, and is formed from the lower end of the outer surface 441 to the middle. Each slit 442 has a top surface 446 which is a horizontal surface located at the upper end of the slit 442 and a side wall surface 447 forming a side wall. The side wall surface 447 includes an upper side wall surface 448 formed substantially vertically at the upper portion thereof, and lower side wall surfaces 449 and 450 formed inclined at the lower portion thereof. For this reason, in the upper part of the slit 442, the width | variety of the slit 442 is constant irrespective of height. On the other hand, in the lower part of the slit 442, the width of the slit 442 becomes wider toward the lower side.

  Furthermore, holes 443 are formed at two locations on the outer surface 441 of the constant flow valve body 44 above the top surface 446. The hole 443 has a diameter in the horizontal direction that is longer than a diameter in the vertical direction, and is formed so as to communicate the outside of the constant flow valve body 44 and the valve inner space 445.

  Returning again to FIG. The outer surface 441 of the constant flow valve body 44 faces and opposes the inner wall of the secondary side internal flow path 30. Therefore, when the valve body member 40 is lifted so as to allow water to pass between the primary side internal flow path 20 and the secondary side internal flow path 30 (direction to enter the back pressure chamber 14, backward direction, valve opening direction) Although water flows into the secondary side internal flow path 30, there are two such flow paths.

  The first flow path (main flow path) is a flow path that passes through the space formed by the inner wall of the secondary side internal flow path 30 and the slit 442 and flows into the secondary side internal flow path 30. When the valve body member 40 is lifted so as to allow water to pass between the primary side internal flow path 20 and the secondary side internal flow path 30 (the direction of entering the back pressure chamber 14, the retreat direction, and the valve opening direction), the primary side Water flows into the slit 442 from the internal flow path 20. At this time, the higher the valve body member 40 is, the more water flows into the lower portion of the slit 442. Since the slit 442 becomes wider as it goes downward, the cross-sectional area of the flow path of water becomes larger, and acts to increase the flow rate. The valve body member 40 rises so as to allow water to pass between the primary side internal flow path 20 and the secondary side internal flow path 30 (direction to enter the back pressure chamber 14), and then descends (direction toward the outlet 31). , Forward direction, valve closing direction), water will flow into the upper part of the slit 442. As a result, the cross-sectional area of the water channel becomes narrower and acts to reduce the flow rate.

  The second flow path (sub-flow path) is a flow path that flows from the hole 443 into the valve inner space 445 and then passes through the hole 444 and flows into the secondary-side internal flow path 30. The flow path cross-sectional area of this flow path hardly changes as the valve body member 40 moves up and down. Therefore, the valve body member 40 is lifted so as to allow water to pass between the primary side internal flow path 20 and the secondary side internal flow path 30 (the direction of entering the back pressure chamber 14, the backward direction, the valve opening direction). In, water always flows at a constant instantaneous flow rate.

  The main valve body 42 is provided with an accommodation recess 46 on the upper side thereof. The housing recess 46 is formed in a concave shape so as to recede from the back pressure chamber 14 side. A sub valve seat 465 is provided on the back pressure chamber 14 side of the housing recess 46. The accommodation recess 46 is formed with a hole 461, a recess 462, and a sub-hole 463 (back pressure flow path).

  The hole 461 is formed as a communication hole that connects the primary side internal flow path 20 and the recess 462. The recess 462 accommodates the spring 50 and the auxiliary valve rod 48. A large-diameter portion 481 at the tip of the auxiliary valve rod 48 is disposed in the recess 462. The large diameter portion 481 is in contact with the spring 50 and urges the valve body member 40 toward the outlet 31 via the spring 50.

  The auxiliary valve rod 48 has a small diameter portion 483 extending in a rod shape and a large diameter portion 481 provided at the tip of the small diameter portion 483. The small diameter portion 483 passes through a communication path 464 (back pressure flow path) provided in the sub valve seat 465. A gap that allows water to flow is formed between the communication passage 464 and the small diameter portion 483. Accordingly, the water flowing into the recess 462 from the hole 461 flows into the back pressure chamber 14 through the communication path 464. Further, part of the water that has passed through the hole 461 flows to the back pressure chamber 14 through the sub-hole 463. When the communication path 464 is closed, all the water that has passed through the hole 461 flows to the back pressure chamber 14 through the auxiliary hole 463.

  The back pressure chamber 14 and the auxiliary back pressure chamber 12 are separated by a first position adjusting member 60. The first position adjustment member 60 is provided with a recess 601. The recess 601 is formed as a recess whose outer wall protrudes toward the back pressure chamber 14. A communication path 602 is formed at the lower end of the recess 601. A spring 70 having a linear characteristic is arranged on the back pressure chamber 14 side of the recess 601. One end of the spring 70 is accommodated in the recess 601 and the other end is disposed so as to contact the second position adjusting member 65.

  The second position adjusting member 65 is disposed so as to penetrate the center of the winding of the spring 70. One end of the second position adjusting member 65 is disposed so as to abut or separate from one end of the small diameter portion 483 of the auxiliary valve rod 48, and the other end of the second position adjusting member 65 is fixed to the main body portion 10. Yes. The water that has entered the back pressure chamber 14 flows to the bypass flow path 80 side through the communication path 602.

  The first position adjusting member 60 is applied to the force pushed by the pressure difference between the auxiliary back pressure chamber 12 and the back pressure chamber 14, the force that the spring 70 tries to counter, and the first adjusting member 60 and the valve body member 40. Depending on the balance with the sliding resistance, the secondary back pressure chamber 12 is slid so as to widen (back pressure chamber 14 is narrowed), or the secondary back pressure chamber 12 is narrowed (back pressure chamber 14 is widened). It is configured so that.

  The auxiliary back pressure chamber 12 is configured so that the same pressure as the primary pressure applied to the primary side internal flow path 20 is applied. Specifically, the primary side internal flow path 20 and the auxiliary back pressure chamber 12 are connected by the auxiliary primary flow path 22, and the primary pressure is transmitted to the auxiliary back pressure chamber 12.

  The back pressure chamber 14 and the secondary side internal flow path 30 are connected by a bypass flow path 80. An electromagnetic valve 82 is provided in the bypass flow path 80. If the electromagnetic valve 82 is closed, a primary pressure is applied to the inside of the back pressure chamber 14. On the other hand, when the electromagnetic valve 82 is opened, the water in the back pressure chamber 14 flows out from the bypass flow path 80 to the secondary side internal flow path 30, and the internal pressure in the back pressure chamber 14 decreases.

  Next, the operation of the flash valve SV will be described with reference to FIGS. 5 to 9 are diagrams showing the water discharge operation of the flash valve SV shown in FIG. (A) in each of FIGS. 5 to 9 shows a state where the feed water pressure is low, (B) in each of FIGS. 5 to 9 shows a state where the feed water pressure is high, and (C) in each of FIGS. Indicates the lift amount of the valve body member 40, the combined area (small hole area) of the auxiliary hole 463 and the communication passage 464, and the instantaneous flow rate flowing to the toilet SB side. In each of FIG. 5 to FIG. 9C, the solid line indicates the case where the feed water pressure is low, and the broken line indicates the case where the feed water pressure is high.

  As shown in FIGS. 5A, 5 </ b> B, and 5 </ b> C, when the electromagnetic valve 82 is closed, the back pressure chamber 14 and the auxiliary back pressure chamber 12 have the same primary as the primary side internal flow path 20. There is pressure. The main valve body 42 of the valve body member 40 is also pushed into the outlet 31 side by the primary pressure, and the main valve body 42 comes into close contact with the boundary surface between the primary side internal flow path 20 and the secondary side internal flow path 30 and stops. It is watered. Further, since the auxiliary valve body 482 and the auxiliary valve seat 465 are in contact with each other, the combined area (small hole area) of the auxiliary hole 463 and the communication passage 464 is a flow passage cross-sectional area of only the auxiliary hole 463.

  Subsequently, as shown in FIGS. 6A, 6 </ b> B, and 6 </ b> C, when the electromagnetic valve 82 is opened at time t <b> 1, the low-pressure bypass flow path 80 and the back pressure chamber 14 are first communicated with each other. . Then, the water in the back pressure chamber 14 flows out to the bypass flow path 80 side. Since the pressure difference between the back pressure chamber 14 and the auxiliary back pressure chamber 12 is generated, the first position adjusting member 60 is pushed down. Since the second position adjusting member 65 is fixed to the main body 10, it does not move. Since the spring 70 is disposed between the second position adjusting member 65 and the first position adjusting member 60 that do not move, the spring 70 contracts and generates a reaction force when the first position adjusting member 60 is pushed down. The amount by which the first position adjusting member 60 approaches the valve body member 40 is such that the force that the first position adjusting member 60 is pressed by the differential pressure between the auxiliary back pressure chamber 12 and the back pressure chamber 14 and the spring 70 try to counter it. It is determined by the balance between the force and the sliding resistance applied to the first adjustment member 60 and the valve body member 40.

  Therefore, when the feed water pressure is low as shown in FIG. 6A, the first position adjusting member 60 is not pushed down much, and when the feed water pressure is high as shown in FIG. The first position adjusting member 60 is largely pushed down.

  When the water in the back pressure chamber 14 flows out, the valve body member 40 is pushed up to the back pressure chamber 14 side. Since the main valve body 42 (main valve body surface 421) of the valve body member 40 is detached from the main valve seat surface 201, water flows from the primary side internal flow path 20 to the secondary side internal flow path 30. The flow rate of water flowing from the primary side internal flow path 20 to the secondary side internal flow path 30 is the flow rate flowing through the main flow path (flow path passing through the slit 442) and the sub flow path (flow path passing through the hole 443). The flow rate is a combination of the flow rate and the flow rate, and is adjusted by the width of the slit 442 (the size of the cross-sectional area of the flow channel) at the location where water flows into the slit 442 from the primary side internal flow channel 20. That is, only the flow rate flowing through the main flow path is adjusted according to the position of the valve body member 40, and the flow rate flowing through the sub flow path is substantially constant regardless of the position of the valve body member 40.

  Since the first position adjusting member 60 functions as a position control member by adjusting the lift amount of the valve body member 40, when the first position adjusting member 60 is pushed down relatively little as shown in FIG. The lift amount becomes large, and the lift amount of the valve body member 40 becomes small when the lift amount is relatively lowered as shown in FIG. Further, since the auxiliary valve body 482 and the auxiliary valve seat 465 are separated from each other, the combined area (small hole area) of the auxiliary hole 463 and the communication path 464 is the flow passage cross-sectional area of the auxiliary hole 463 and the communication path 464.

  When the feed water pressure is low as shown in FIG. 6 (A), the lift amount of the valve body member 40 is large, and when the feed water pressure is high as shown in FIG. 6 (B), the lift amount of the valve body member 40 is small. Therefore, the instantaneous flow rate of the wash water supplied to the toilet SB side is substantially the same. Note that it is not necessary to keep the instantaneous flow rate of the wash water supplied to the toilet bowl SB exactly the same, and it is sufficient if an equivalent instantaneous flow rate within a certain range can be secured.

  As shown in FIGS. 7A, 7 </ b> B, and 7 </ b> C, when the electromagnetic valve 82 is closed at time t <b> 2, water accumulates in the back pressure chamber 14 through the auxiliary hole 463 and the communication path 464. Since the sub valve body 482 and the sub valve seat 465 are separated from each other, the combined area (small hole area) of the sub hole 463 and the communication path 464 is the flow passage cross-sectional area of the sub hole 463 and the communication path 464. Accordingly, a large amount of water flows into the back pressure chamber 14 at a stretch.

  As shown in FIGS. 8A, 8 </ b> B, and 8 </ b> C, when a large amount of water flows into the back pressure chamber 14 through the sub-hole 463 and the communication passage 464, the valve body member 40 moves to the outlet. It is pushed down in the 31 direction. When the valve body member 40 is pushed down in the valve closing direction, the sub valve body 482 and the sub valve seat 465 come into contact with each other, and the communication passage 464 is closed. Since the small diameter portion 483 of the sub valve rod 48 in which the sub valve body 482 is formed is in contact with the fixed second position adjusting member 65, the position of the sub valve body 482 does not depend on whether the water supply pressure is high or low. It becomes almost constant. Therefore, the valve body member 40 is forcibly moved to a predetermined lowering reference (reference position) regardless of the level of the water supply pressure. After the auxiliary valve body 482 and the auxiliary valve seat 465 come into contact with each other, the inflow into the back pressure chamber 14 is only from the auxiliary hole 463. The valve body member 40 is further pushed down at a slower speed than when forcibly moving to a predetermined lowering reference. Along with the movement of the valve body member 40, the auxiliary valve rod 48 is also pushed down integrally through the spring 50.

  In a state where the valve body member 40 is forcibly moved to a predetermined lowering reference (reference position), the height of the top surface 446 of the slit 442 is equal to the secondary side internal flow path 30 of the primary side internal flow path 20. It is located below the boundary surface for. For this reason, the flow path (main flow path) into which water flows into the slit 442 from the primary side internal flow path 20 is substantially blocked. On the other hand, the hole 443 formed above the top surface 446 of the slit 442 is located above the boundary surface of the primary side internal flow path 20 with respect to the secondary side internal flow path 30. For this reason, after time t2, the water supplied from the primary side internal flow path 20 to the secondary side internal flow path 30 does not pass through the main flow path but passes through only the sub flow path.

  As shown in FIGS. 9A, 9B, and 9C, when the valve body member 40 is pushed down until the main valve body 42 contacts the main valve seat surface 201, both the main flow path and the sub flow path are Since it is in a closed state, the supply of water to the toilet SB is stopped. Therefore, the water supplied to the toilet SB from (C) in FIG. 8 to (C) in FIG. 9 is used as the refill water supplied to the sealed water portion SW of the toilet SB.

  In this way, by reducing the instantaneous flow rate before the start of the refill water supply stage, even if water is supplied in the refill water supply stage, toilet flushing is performed without accumulating in the sealing part SW of the toilet SB. Can be suppressed. In particular, in the case of a siphon-type toilet, if the instantaneous flow rate in the refill water supply stage is too large, siphon reduction occurs and the possibility of toilet cleaning is increased.

  Since this refill water is supplied only from the sub-flow channel, the instantaneous flow rate after time t2 does not vary with time as shown in FIG. 9 even though the position of the valve body member 40 has changed. Since the instantaneous flow rate of the water flowing through the primary side internal flow path 20 does not change, the primary side internal flow path 20 (feed water pressure) also does not change.

Comparing the case where the feed water pressure is low and the case where the feed water pressure is high, the instantaneous flow rate immediately after time t2 is smaller when the feed water pressure is low than when the feed water pressure is high. This is because the instantaneous flow rate has the following relationship.
Q = Cv√Δp
Q: instantaneous flow rate, Cv: reciprocal of channel resistance, Δp: differential pressure between inlet and outlet, after time t2, until main valve body 42 contacts main valve seat surface 201 (until refill water supply stops) ), The time when the feed water pressure is low is longer than that when the feed water pressure is high. This is because when the water supply pressure is low, the force to push down the valve body member 40 is weak, and it takes a long time for the main valve body 42 to contact the main valve seat surface 201.

  The total amount of refill water supplied to the toilet after time t2 is represented by the area of the graphic sandwiched between the time axis after time t2 and each line in the graph of instantaneous flow rate in FIG. 9C. The As apparent from FIG. 9C, when the water supply pressure is low and high, the area of the figure is almost the same. Therefore, even when the feed water pressure is low or high, a predetermined amount (depending on the type of the toilet SB) of refill water can be supplied within a predetermined allowable range.

  As described above, the auxiliary valve body 482 and the auxiliary valve seat 465 of the auxiliary valve rod 48 of this embodiment function as the refill water amount adjusting means of the present invention. In the present embodiment, by this refill water amount adjusting means, the refill water supply stage for supplying the refill water for forming the sealed water of the toilet SB to the toilet SB (after time t2 of (C) in FIGS. 8 and 9 respectively) ), By adjusting the forward movement of the valve body member 40 (the action of bringing the main valve body 42 closer to the main valve seat surface 201) in accordance with the feed water pressure from the primary side internal flow path 20, a place that does not depend on the feed water pressure A fixed amount of refilled water can be supplied to the toilet SB. The degree of proximity of the main valve body to the main valve seat and the degree of proximity of the constant flow valve body to the constant flow valve seat are adjusted by adjusting the forward movement of the valve body member according to the supply water pressure from the primary side flow path. It is possible to suppress the amount of refill water to be supplied from fluctuating depending on the level of the water supply pressure.

  Furthermore, the slit 442, the hole 443, the valve inner space 445, and the hole 444 of the constant flow valve body 44 of this embodiment function as the refill water flow rate holding means of the present invention. In this embodiment, the instantaneous flow rate of the refill water supplied from the primary side internal flow path 20 in the refill water supply stage does not vary with time by the refill water flow rate holding means. For this reason, the pressure (feed water pressure) of the primary side internal flow path 20 does not fluctuate with time and is kept constant. As a result, the amount of refill water supplied to the toilet SB can be made constant without depending on the water supply pressure by the water amount adjusting means.

  Next, a flash valve SVa that is a second embodiment of the present invention will be described with reference to FIG. The flash valve SVa is obtained by replacing the constant flow valve body 44 of the flash valve SV with a constant flow valve body 44a. The flash valve SVa further moves from the primary side internal flow path 20 to the secondary side internal flow path 30 on the inner side of the main valve seat surface 201 in the boundary surface of the primary side internal flow path 20 with respect to the secondary side internal flow path 30. It has a through-hole 210 that communicates.

  The structure of the constant flow valve body 44a will be described in detail with reference to FIGS. FIG. 11 is a side view of the constant flow valve body 44a, and FIG. 12 is a perspective view of the constant flow valve body 44a. Four slits 442a are formed at equal intervals on the outer surface 441a of the constant flow valve body 44a. Each slit 442a is a bottomed groove having a rectangular cross section, and is formed from the lower end of the outer surface 441a to the vicinity of the upper end. Each slit 442a has a side wall surface 447a. The side wall surface 447a is formed in an inclined shape with an upper side wall surface 448a formed in an inclined shape, an intermediate side wall surface 449a formed below the upper side wall surface 448a and substantially vertically, and below the middle side wall surface 449a. Lower side wall surfaces 450a and 451a. For this reason, the width of the slit 442a becomes wider as it goes downward.

  Compared with the constant flow valve body 44 shown in FIGS. 3 and 4, the constant flow valve body 44a is different in that no hole 443 is formed. Also, the width of the slit 442a becomes wider toward the lower side also in the upper part of the slit 442a.

  Returning again to FIG. The outer surface 441 a of the constant flow valve body 44 a is opposed to the inner wall of the secondary side internal flow path 30. Therefore, when the valve body member 40 is lifted so as to allow water to pass between the primary side internal flow path 20 and the secondary side internal flow path 30 (direction to enter the back pressure chamber 14, backward direction, valve opening direction) Although water flows into the secondary side internal flow path 30, there are two such flow paths.

  The first flow path (main flow path) is a flow path that passes through the space formed by the inner wall of the secondary side internal flow path 30 and the slit 442 a and flows into the secondary side internal flow path 30. When the valve body member 40 is lifted so as to allow water to pass between the primary side internal flow path 20 and the secondary side internal flow path 30 (the direction of entering the back pressure chamber 14, the retreat direction, and the valve opening direction), the primary side Water flows from the internal flow path 20 into the slit 442a. At this time, the higher the valve body member 40 is, the more water flows into the lower portion of the slit 442a. Since the slit 442a becomes wider as it goes downward, the cross-sectional area of the flow path of water becomes larger, and acts to increase the flow rate. The valve body member 40 rises so as to allow water to pass between the primary side internal flow path 20 and the secondary side internal flow path 30 (direction to enter the back pressure chamber 14), and then descends (direction toward the outlet 31). , Forward direction, valve closing direction), water will flow into the upper part of the slit 442a. As a result, the cross-sectional area of the water channel becomes narrower and acts to reduce the flow rate.

  The second flow path (sub-flow path) is a flow path that flows from the primary side internal flow path 20 through the through hole 210 and flows into the secondary side internal flow path 30. As for this flow path, the flow path cross-sectional area in the portion where the flow rate is controlled is hardly changed by the rising and lowering of the valve body member 40. Therefore, the valve body member 40 is lifted so as to allow water to pass between the primary side internal flow path 20 and the secondary side internal flow path 30 (the direction of entering the back pressure chamber 14, the backward direction, the valve opening direction). In, water always flows at a constant instantaneous flow rate.

  The other configuration of the flash valve SVa is the same as that of the flash valve SV, and a description thereof will be omitted.

  Next, the operation of the flash valve SVa will be described with reference to FIG. FIG. 13 is a diagram showing a water discharge operation of the flash valve SVa shown in FIG. As shown in FIG. 13A, when the electromagnetic valve 82 is closed, the same primary pressure as the primary side internal flow path 20 is applied to the back pressure chamber 14 and the auxiliary back pressure chamber 12. The main valve body 42 of the valve body member 40 is also pushed into the outlet 31 side by the primary pressure, and the main valve body 42 comes into close contact with the boundary surface between the primary side internal flow path 20 and the secondary side internal flow path 30 and stops. It is watered. Further, since the auxiliary valve body 482 and the auxiliary valve seat 465 are in contact with each other, the combined area (small hole area) of the auxiliary hole 463 and the communication passage 464 is a flow passage cross-sectional area of only the auxiliary hole 463.

  Subsequently, as shown in FIG. 13B, when the electromagnetic valve 82 is opened, first, the low-pressure bypass flow path 80 and the back pressure chamber 14 are communicated with each other. Then, the water in the back pressure chamber 14 flows out to the bypass flow path 80 side. Since the pressure difference between the back pressure chamber 14 and the auxiliary back pressure chamber 12 is generated, the first position adjusting member 60 is pushed down. Since the second position adjusting member 65 is fixed to the main body 10, it does not move. Since the spring 70 is disposed between the second position adjusting member 65 and the first position adjusting member 60 that do not move, the spring 70 contracts and generates a reaction force when the first position adjusting member 60 is pushed down. The amount by which the first position adjusting member 60 approaches the valve body member 40 is such that the force that the first position adjusting member 60 is pressed by the differential pressure between the auxiliary back pressure chamber 12 and the back pressure chamber 14 and the spring 70 try to counter it. It is determined by the balance between the force and the sliding resistance applied to the first adjustment member 60 and the valve body member 40.

  Therefore, when the feed water pressure is low, the first position adjustment member 60 is not pushed down so much, and when the feed water pressure is high, the first position adjustment member 60 is pushed down greatly.

  When the water in the back pressure chamber 14 flows out, the valve body member 40 is pushed up to the back pressure chamber 14 side. Since the main valve body 42 (main valve body surface 421) of the valve body member 40 is detached from the main valve seat surface 201, water flows from the primary side internal flow path 20 to the secondary side internal flow path 30. The flow rate of water flowing from the primary side internal flow path 20 to the secondary side internal flow path 30 is the flow rate of the main flow path (flow path passing through the slit 442a) and the sub flow path (flow path passing through the through hole 210). And is adjusted by the width of the slit 442a (the size of the cross-sectional area of the flow path) where water flows from the primary-side internal flow path 20 into the slit 442a. That is, only the flow rate flowing through the main flow path is adjusted according to the position of the valve body member 40, and the flow rate flowing through the sub flow path is substantially constant regardless of the position of the valve body member 40.

  Since the first position adjusting member 60 is for adjusting the lift amount of the valve body member 40, when the feed water pressure is low and pushed down relatively low, the lift amount of the valve body member 40 becomes large and the feed water pressure is relatively high. When the valve member 40 is pushed down a lot, the lift amount of the valve body member 40 becomes small. Further, since the auxiliary valve body 482 and the auxiliary valve seat 465 are separated from each other, the combined area (small hole area) of the auxiliary hole 463 and the communication path 464 is the flow passage cross-sectional area of the auxiliary hole 463 and the communication path 464.

  When the feed water pressure is low, the lift amount of the valve body member 40 is large, and when the feed water pressure is high, the lift amount of the valve body member 40 is small. Therefore, the instantaneous flow rate of the cleaning water supplied to the toilet SB side is approximately. It will be the same. Note that it is not necessary to keep the instantaneous flow rate of the wash water supplied to the toilet bowl SB exactly the same, and it is sufficient if an equivalent instantaneous flow rate within a certain range can be secured.

  As shown in FIG. 13C, when the electromagnetic valve 82 is closed, water accumulates in the back pressure chamber 14 through the auxiliary hole 463 and the communication passage 464. Since the sub valve body 482 and the sub valve seat 465 are separated from each other, the combined area (small hole area) of the sub hole 463 and the communication path 464 is the flow passage cross-sectional area of the sub hole 463 and the communication path 464. Accordingly, a large amount of water flows into the back pressure chamber 14 at a stretch.

  As shown in FIG. 13D, when a large amount of water flows into the back pressure chamber 14 through the sub-hole 463 and the communication passage 464, the valve body member 40 is pushed down toward the outlet 31. When the valve body member 40 is pushed down in the valve closing direction, the sub valve body 482 and the sub valve seat 465 come into contact with each other, and the communication passage 464 is closed. Since the small diameter portion 483 of the sub valve rod 48 in which the sub valve body 482 is formed is in contact with the fixed second position adjusting member 65, the position of the sub valve body 482 does not depend on whether the water supply pressure is high or low. It becomes almost constant. Therefore, the valve body member 40 is forcibly moved to a predetermined lowering reference (reference position) regardless of the level of the water supply pressure. After the auxiliary valve body 482 and the auxiliary valve seat 465 come into contact with each other, the inflow into the back pressure chamber 14 is only from the auxiliary hole 463. The valve body member 40 is further pushed down at a slower speed than when forcibly moving to a predetermined lowering reference. Along with the movement of the valve body member 40, the auxiliary valve rod 48 is also pushed down integrally through the spring 50.

  In a state where the valve body member 40 is forcibly moved to a predetermined lowering reference (reference position), the highest part of the slit 442a is the boundary of the primary side internal flow path 20 with respect to the secondary side internal flow path 30. Located below the surface. For this reason, the flow path (main flow path) into which water flows from the primary side internal flow path 20 into the slit 442a is substantially blocked. On the other hand, the flow path (sub flow path) flowing into the through-hole 210 from the primary side internal flow path 20 is not blocked when the main valve body surface 421 is separated from the main valve seat surface 201. For this reason, after the valve body member 40 has moved to the reference position, the water supplied from the primary side internal flow path 20 to the secondary side internal flow path 30 does not pass through the main flow path but only the sub flow path. Will pass.

  Thereafter, when the valve body member 40 is pushed down until the main valve body 42 comes into contact with the main valve seat surface 201, both the main flow path and the sub flow path are closed, so that water is supplied to the toilet SB. Stopped. Accordingly, the water supplied to the toilet SB between the time when the valve body member 40 is moved to the reference position and the time when the main valve body 42 contacts the main valve seat surface 201 is the sealed portion SW of the toilet SB. Used as refill water to be supplied to

  In this way, by reducing the instantaneous flow rate before the start of the refill water supply stage, even if water is supplied in the refill water supply stage, toilet flushing is performed without accumulating in the sealing part SW of the toilet SB. Can be suppressed. In particular, in the case of a siphon-type toilet, if the instantaneous flow rate in the refill water supply stage is too large, siphon reduction occurs and the possibility of toilet cleaning is increased.

  Since this refill water is supplied only from the sub-flow path, the instantaneous flow rate after the valve body member 40 has moved to the reference position does not fluctuate even though the position of the valve body member 40 has changed. Since the instantaneous flow rate of the water flowing through the primary side internal flow path 20 does not change, the primary side internal flow path 20 (feed water pressure) also does not change.

  As described above, the slit 442a and the through hole 210 of the constant flow valve body 44a of the present embodiment function as the refill water flow rate holding means of the present invention. In this embodiment, the instantaneous flow rate of the refill water supplied from the primary side internal flow path 20 in the refill water supply stage does not vary with time by the refill water flow rate holding means. For this reason, the pressure (feed water pressure) of the primary side internal flow path 20 does not fluctuate with time and is kept constant. As a result, also in this embodiment, the amount of refill water supplied to the toilet bowl SB can be made constant without depending on the supply water pressure.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above and their arrangement, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, but can be changed as appropriate. Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

SV: Flush valve (channel opening / closing device)
SB: Toilet bowl SW: Sealing part TB: Water supply pipe V: Stop cock 10: Main part 12: Sub back pressure chamber 14: Back pressure chamber 20: Primary side internal flow path 201: Main valve seat surface (main valve seat )
21: Inflow port 210 Through hole 22: Sub primary flow path 30: Secondary side internal flow path 31: Outlet port 40: Valve body member 42: Main valve body 421: Main valve body surface 44: Constant flow valve body 441: Outer surface 442 Slit 443 Hole 444 Hole 445 Valve interior space 446 Top surface 447 Side wall surface 448 Upper side wall surface 449 Lower side wall surface 46: Housing recess 461: Hole 462 Recess 463: Sub-hole (back pressure flow path)
464: Communication path (back pressure flow path)
465 Sub valve seat 48: Sub valve rod 481: Large diameter portion 482: Sub valve body 483: Small diameter portion 50: Spring 60: First position adjustment member 601: Recess 602: Communication path 65: Second position adjustment member 70: Spring 80: Bypass channel 82: Solenoid valve Wa: Inflow water Wb: Outflow water

Claims (5)

A channel opening and closing device that starts supplying water to a toilet by receiving an instruction to start water supply, and autonomously stops water supply by satisfying a predetermined condition,
A main valve body having a main valve body and a main valve seat that opens and closes a flow path between a primary flow path connected to a water supply source and a secondary flow path connected to a toilet that is a water supply destination;
A constant flow valve having a constant flow valve body and a constant flow valve seat for adjusting a cross-sectional area formed between the primary flow path and the secondary flow path so as to keep a constant instantaneous flow rate of water flowing from the primary flow path to the secondary flow path A valve,
The main valve body and the constant flow valve body are formed as an integrated valve body member,
The main valve has a position control member that moves along a sliding direction of the valve body member so as to adjust a movable amount of the valve body member,
The position control member adjusts the position according to the water pressure of the primary side flow path, and the position control member narrows the movable amount of the valve body member when the water pressure of the primary side flow path increases. Is configured to move to
In the wash water supply stage for supplying wash water for washing the toilet to the toilet, the valve body member is driven in the backward direction to separate the main valve body from the main valve seat. While supplying cleaning water to the secondary flow path, while maintaining the constant flow rate of cleaning water by adjusting the cross-sectional area of the flow path,
In the refill water supply stage for supplying the refill water for forming the sealing water of the toilet to the toilet, the refill water flow rate that keeps the instantaneous flow rate of the refill water constant and restrains fluctuation over time. Holding means;
A channel opening and closing device comprising:   The flow path opening and closing device according to claim 1, wherein the flow path opening and closing device is connected to a siphon type toilet.   The refill water flow rate holding means suppresses fluctuations in the flow path cross-sectional area of the flow path to which refill water is supplied by driving the valve body member. Item 3. The flow path opening / closing device according to Item 2.   As a flow path for supplying cleaning water to the toilet, a main flow path and a sub flow path provided separately from the main flow path are provided. In the refill water supply stage, refill water is the main flow. The flow path opening / closing apparatus according to claim 3, wherein the flow path opening / closing apparatus is supplied only from the sub-flow path without passing through a path.   The flow path opening and closing device according to claim 4, wherein the sub flow path is provided in the valve body member.