JP2014015768A - Channel opening/closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a channel opening/closing device that enables a valve member to reduce variations in behavior of a positioning member to the utmost.SOLUTION: A flush valve SV serving as a channel opening/closing device includes a first back-pressure chamber 14 that is arranged so as to make water pressure act on a valve body member 40, and a second back-pressure chamber 15 that is arranged so as to make the water pressure act on a positioning member 60 from the other side of an auxiliary back-pressure chamber 12. The second back-pressure chamber 15 is connected to a secondary-side channel 30 through the first back pressure chamber 14.

Description

  The present invention relates to a flow path opening and closing device that starts supplying water to a toilet by receiving an instruction to start supplying water and autonomously stops supplying water by satisfying a predetermined condition.

  A so-called flash valve is known as such a channel opening / closing device. This flush valve accepts water from the primary flow path that is the water supply source and sends it to the primary internal flow path, and the flow that sends water from the secondary internal flow path to the secondary flow path that is the water supply destination. A main body formed with an outlet, a main valve (diaphragm valve) for opening and closing the flow path between the primary side internal flow path and the secondary side internal flow path, and the primary side internal flow path without going through the main valve And a secondary passage (relief valve) for opening and closing the bypass passage (see, for example, Patent Document 1 below).

  In the flush valve configured as described above, when the sub valve is opened, the bypass flow path is opened, the back pressure of the main valve body constituting the main valve is reduced, and the primary pressure in the primary side internal flow path is reduced. Thus, the main valve body is pushed up so as to be separated from the main valve seat, the main valve is opened, and water flows out from the outflow port 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 functions as a flow path opening / closing device that starts water supply to the toilet upon receiving an instruction to start water supply and autonomously stops water supply when a predetermined condition is satisfied.

  A conventional flush valve is extremely useful as a device for delivering a certain amount of water with a relatively simple configuration, and is widely used as a means for supplying water to a urinal or a urinal. However, due to the structure of the conventional flush valve, it is difficult to strictly control the water volume. According to the Japanese Industrial Standard, the standard water discharge is 15L, and the water discharge is 11 ~ 16.5L if the water pressure is low. If possible, it is allowed, and if the water pressure is high, it is allowed if a water discharge amount of 13.5 to 19 L can be secured.

  As described above, the conventional flush valve has a different amount of water discharge due to fluctuations in water pressure. In addition, in a public space or the like, a plurality of toilets are generally installed in a form of being connected to each other. There is a problem that the water pressure fluctuation is more greatly generated depending on the case. For this reason, the conventional flush valve toilet has a configuration in which the amount of water is increased so that filth can be discharged properly even when the water pressure is low or the water pressure fluctuation is large. Therefore, particularly when the water pressure is high or in an environment where fluctuations in the water pressure are small, excess water must be flowed. As a result, there is a great amount of wasted water, and a countermeasure in terms of water saving has been desired.

  Therefore, a so-called constant flow valve is incorporated in the flash valve, and even if the water pressure fluctuates in a high water pressure environment or in the primary side flow path, waste water is eliminated by keeping the flow rate of water sent to the secondary side flow path constant. A proposal intended to enhance performance has been made (see Patent Document 2 below).

  The conventional technique described in Patent Document 2 incorporates a constant flow valve afterward into a flash valve that can be operated without incorporating a constant flow valve. Each functional member of the conventional normal flash valve is based on the premise that the differential pressure between the primary pressure of the primary flow path and the secondary pressure of the secondary flow path is relatively large. Therefore, when a constant flow valve is installed as a retrofit, the differential pressure between the primary pressure and the secondary pressure becomes small, so although the effect of making the flow rate constant can be expected to some extent, the opening and closing response of the main valve becomes dull. there is a possibility. In particular, more reliable constant flow rate control is required to achieve water saving in the entire toilet bowl cleaning system including the flow path opening / closing device. In addition, when a constant flow valve is incorporated as a retrofit, it is a matter of course that a constant flow valve is added to the structure of a conventional normal flash valve, which makes it difficult to reduce the overall size of the apparatus. is there.

  In view of such a problem, a flow path opening / closing device that can quickly open and close a main valve for starting and stopping water supply while keeping the instantaneous flow rate of water supply constant is provided. As a thing, the flow-path opening-and-closing apparatus of the following patent document 3 is provided.

  The flow path opening and closing device described in Patent Document 3 below includes an inlet that receives water from a primary flow path that is a water supply source and sends the water to a primary internal flow path, and a secondary that is a water supply destination from the secondary internal flow path It has a main body formed with an outlet for sending water to the side channel. Further, the flow path opening / closing device includes a main valve having a main valve body and a main valve seat for performing flow path opening and closing between the primary side internal flow path and the secondary side internal flow path, and the primary side without passing through the main valve. A bypass channel that connects the internal channel and the secondary side internal channel and a sub valve that opens and closes the bypass channel are provided. Also, in the flow path opening / closing device, after the sub valve is opened, the back pressure of the main valve body is reduced, the main valve is opened, and water flows from the primary side internal flow path to the secondary side internal flow path. When the sub valve is closed, the main valve is kept open until the back pressure of the main valve body rises so as to balance with the primary pressure in the primary side internal flow path, and the main valve is closed. Delay means for delaying is provided.

JP 2006-170382 A JP 2000-282537 A JP 2011-226249 A

  The flow path opening / closing device described in Patent Document 3 is a position that moves along the sliding direction of the valve member so as to adjust the movable amount of the valve member in which the main valve body and the constant flow valve body are integrated. The adjusting member and a spring configured to increase the repulsive force when the position adjusting member moves in a direction to reduce the movable amount of the valve member. The spring is configured such that the repulsive force increases when the position control member moves in a direction to narrow the movable amount of the valve member.

  In the conventional flow path opening and closing device described above, the main valve is opened by lowering the back pressure of the main valve body, and since the main valve body is driven using the differential pressure with respect to the main valve body, It is necessary to seal the periphery of the main valve body (valve member). Further, the position adjusting member that moves along the sliding direction of the valve member also utilizes the difference between the force that the position adjusting member receives from the auxiliary back pressure chamber and the force that the position adjusting member receives from the back pressure chamber. Therefore, it is necessary to seal the periphery.

  Therefore, the movement of the valve member and the position adjusting member is also affected by the sliding resistance due to the seal, which may cause a variation that cannot be measured only by the differential pressure. As a specific aspect of the variation, whether the position adjusting member moves from the valve member side after the collision between the position adjusting member and the valve member with respect to the balance position of the position adjusting member assumed from the hydrostatic pressure and the dynamic water pressure, There are two modes of moving from the opposite side of the member. One is to open further in the valve opening direction after the valve member hits the position adjusting member when the position adjusting member is pushed down toward the valve member at the start of water discharge. The other is to close in the valve closing direction after the valve member hits the position adjusting member when the position adjusting member is pushed up to the side away from the valve member at the start of water discharge.

  As described above, when the position adjustment member moves from a different direction with respect to the balance position, the difference in the balance position may increase due to the sliding resistance in the position adjustment member and the valve member. It affects the behavior of the member and valve member and causes variation.

  Therefore, an object of the present invention is to provide a flow path opening / closing device in which the valve member can reduce the variation in the behavior of the position adjusting member as much as possible.

  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 body and a constant flow valve having a constant flow valve seat for adjusting a cross-sectional area of the flow path formed between the primary flow path and the secondary flow path so as to keep constant the instantaneous flow rate of water flowing from the primary flow path to the secondary flow path; A position adjusting member, at least a part of which moves along the sliding direction of the valve body member so as to adjust the movable amount of the valve body member formed by integrating the main valve body and the constant flow valve body, A back pressure chamber and a sub back pressure chamber provided to apply force to the adjustment member from opposite sides, respectively. Obtain.

  The position adjusting member in the present invention is configured to adjust the position according to the water pressure of the primary side flow path by receiving the water pressure of the primary side flow path from the auxiliary back pressure chamber, and the water pressure of the primary side flow path is increased. And the valve body member moves in the direction of decreasing the movable amount. The back pressure chamber in the present invention is disposed so that the water pressure is applied to the position adjustment member from the side opposite to the auxiliary back pressure chamber, and the first back pressure chamber is disposed to apply the water pressure to the valve body member. A second back pressure chamber. The second back pressure chamber is connected to the secondary flow path through the first back pressure chamber.

  According to the present invention, the valve body member is driven by the differential pressure between the water pressure received from the flow path side and the water pressure received from the first back pressure chamber side, and the position adjusting member is connected to the water pressure received from the auxiliary back pressure chamber and the second back pressure chamber. It is driven by the pressure difference from the water pressure received from the pressure chamber side. In the case of the present invention, since the second back pressure chamber is connected to the secondary flow path through the first back pressure chamber, when the valve opening operation is performed by draining water from the back pressure chamber to the secondary flow path, Water is drained from the first back pressure chamber first, and then water is drained from the second back pressure chamber. Therefore, since the first back pressure chamber is decompressed before the second back pressure chamber, the valve body member is driven earlier than the position adjusting member, and the main valve is greatly opened. Thereafter, since the water is drained from the second back pressure chamber and the pressure is reduced, the position adjusting member moves to the valve body member side and moves to a predetermined balance position.

  Therefore, in the flow rate adjustment stage, the position adjustment member moves in one direction to push down the valve body member in the valve closing direction, so that variations due to changes in the sliding direction are unlikely to occur. Therefore, it is possible to suppress variations in the opening of the main valve and the constant flow valve and variations in the amount of cleaning water supplied by the flow path opening / closing device. Further, when water is introduced into the back pressure chamber during the valve closing operation, water can be introduced first from the first back pressure chamber, so that the water pressure can be applied to the valve body member at the initial stage of water introduction. It does not adversely affect the closing speed of the main valve.

  In the flow path opening / closing apparatus according to the present invention, an annular seal member having a part of the outer periphery cut out is disposed on the position adjusting member, and the first back pressure chamber and the second back pressure chamber are partitioned by the seal member. It is also preferable.

  By sealing the space between the two back pressure chambers with an annular seal member with a part of the outer periphery cut off, it becomes possible to achieve both an appropriate flow path resistance and sliding resistance. Since the communication channel that connects the first back pressure chamber and the second back pressure chamber is formed at the notch provided in the seal member, the communication channel can be simply configured without providing holes in each member. can do.

  In the flow path opening / closing apparatus according to the present invention, the flow resistance of water flowing from the second back pressure chamber to the first back pressure chamber is greater than the flow resistance of water flowing from the first back pressure chamber to the secondary flow path. Is also preferable.

  In this preferable aspect, a large speed difference is provided between the speed at which water flows from the second back pressure chamber to the first back pressure chamber and the speed at which water flows from the first back pressure chamber to the secondary side flow path. The main valve body can be reliably opened first.

  ADVANTAGE OF THE INVENTION According to this invention, the flow-path opening / closing apparatus in which the valve member can reduce the dispersion | variation in the behavior of a position adjustment member as much as possible 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 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. FIG. 3 is a view showing a state where a main valve is opened in the flash valve shown in FIG. 2. FIG. 3 is a view showing a state in which the position adjustment member and the main valve are balanced in the flash valve shown in FIG. 2.

  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 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. The main body 10 includes a main body member 101 and an upper lid member 102. When the upper lid member 102 is fitted into the main body member 101, the main body portion 10 is configured to have an internal flow path that is a water passage.

  A primary side internal flow path 20, a secondary side internal flow path 30, a first back pressure chamber 14, a second back pressure chamber 15, and a secondary back pressure chamber 12 are formed inside the main body 10. ing. 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 first 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 includes a valve upper member 42, a filter member 43, a fixing member 44, a seating surface packing 45, a valve lower member 46, a built-in valve 47, and a built-in valve packing 48 provided on the upper part. And a built-in valve holding member 49.

  The valve upper member 42 is configured as a multistage cylindrical member having a bottom and an open upper portion. The upper side of the valve upper member 42, that is, the side facing the back pressure chamber 14 has the largest outer diameter, and the lower side of the valve upper member 42, that is, the side facing the outlet 31 is configured to have the smallest outer diameter. Yes.

  The valve upper member 42 has a small-diameter vertical internal flow path 421 formed on the bottom side and a large-diameter vertical internal flow path 422 formed on the top side. The vertical internal flow path 421 and the vertical internal flow path 422 are connected and arranged along the axial direction of the valve upper member 42. The valve upper member 42 is further formed with a horizontal internal flow path 423 so as to be connected to the vertical internal flow path 421 from the side. The horizontal internal flow path 423 and the primary internal flow path 20 are connected, and water flowing from the primary internal flow path 20 passes through the horizontal internal flow path 423, the vertical internal flow path 421, and the vertical internal flow path 422. , And is configured to flow into the back pressure chamber 14.

  The filter member 43 is provided on the side of the valve upper member 42 so as to be interposed between the primary side internal flow path 20 and the horizontal internal flow path 423. The filter member 43 is sandwiched and held between the upper end portion of the valve upper member 42 and the fixing member 44.

  A built-in valve 47 is disposed in the longitudinal internal flow path 421 of the valve upper member 42. The built-in valve 47 is arranged so that one end side thereof moves along the inside of the vertical internal flow path 421, and the other end side protrudes from the upper end side of the valve upper member 42 into the back pressure chamber 14 and moves toward the spring base 103. Is arranged.

  A built-in valve spring 50 is disposed so as to abut one end side of the built-in valve 47. The built-in valve spring 50 is disposed in the vertical internal flow path 421 and is configured to expand and contract between one end side of the built-in valve 47 and the bottom of the vertical internal flow path 421.

  The built-in valve 47 is formed so that one end side disposed in the vertical internal flow path 421 has a large diameter, and the remaining portion has a small diameter and a rod shape. A built-in valve holding member 49 is provided so as to surround the small-diameter bar portion of the built-in valve 47. A built-in valve packing 48 is provided at a lower end and a central portion of the built-in valve holding member 49, that is, a portion facing the vertical internal flow path 421.

  When the built-in valve 47 moves to the uppermost position, the large diameter portion on one end side of the built-in valve 47 comes into contact with the built-in valve packing 48. When the built-in valve spring 50 is extended and a large diameter portion which is one end side of the built-in valve 47 is brought into contact with the built-in valve packing 48, the inflow of water from the vertical internal flow path 421 to the vertical internal flow path 422 is suppressed.

  The small diameter portion of the built-in valve 47 passes through a communication path (back pressure flow path) provided in the built-in valve packing 48 and the built-in valve holding member 49. A gap through which water can flow is formed between the communication path provided in the built-in valve packing 48 and the built-in valve holding member 49 and the small diameter portion. Therefore, the water that has flowed into the vertical internal flow path 421 flows to the first back pressure chamber 14 through this communication path. A part of the water flows into the back pressure chamber 14 through the sub hole 491 formed in the valve upper member 42.

  The valve lower member 46 is fitted and fixed to the lower side of the valve upper member 42, that is, the outer periphery of the portion where the small-diameter vertical internal flow path 421 is formed. The valve lower member 46 functions as a constant flow valve body.

  The structure of the valve lower member 46 as the constant flow valve body will be described in detail with reference to FIGS. FIG. 3 is a side view of the valve lower member 46, and FIG. 4 is a perspective view of the valve lower member 46.

  Four slits 462 are formed at equal intervals on the outer surface 461 of the valve lower member 46. Each slit 462 is a bottomed groove having a rectangular cross section, and is formed from the lower end of the outer surface 461 to the middle. The outer side surface 461 is formed so as to incline from the upper part toward the lower part thereof, and is configured such that the entire diameter is reduced toward the lower part.

  The outer side surface 461 of the valve lower member 46 is opposed to the inner side wall of the secondary side internal flow path 30 in the vicinity thereof. 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) Water flows into the secondary side internal flow path 30 and acts to increase the flow rate.

  When the valve body member 40 is raised 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 first back pressure chamber 14, the backward direction, the valve opening direction) Water flows into the slit 462 from the primary side internal flow path 20. At this time, the higher the valve body member 40 is, the larger the distance between the valve lower member 46 and the inner wall of the secondary side internal flow path 30 is. Since the valve lower member 46 has a smaller diameter as it goes downward, the flow passage cross-sectional area of the 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). , The forward direction, the valve closing direction), the distance between the valve lower member 46 and the inner side wall of the secondary side internal flow path 30 is reduced. As a result, the cross-sectional area of the water channel becomes narrower and acts to reduce the flow rate.

  Returning again to FIG. The seating surface packing 45 is held between the fixing member 44 and the valve lower member 46. The seating surface packing 45 is a member constituting the main valve body surface. When the valve body member 40 is pushed most downstream, the seating surface packing 45 comes into contact with 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 flow path It is configured to block the flow of water to and from the internal flow path 30. Accordingly, the boundary surface with which the seat surface packing 45 constituting the main valve body surface abuts functions as the main valve seat surface 201 (main valve seat). On the other hand, the remaining part of the valve body member 40 excluding the valve lower member 46 functions as a main valve body.

  The first back pressure chamber 14, the second back pressure chamber 15, and the auxiliary back pressure chamber 12 are separated by a position adjusting member 60. The 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 constant flow spring 70 having a linear characteristic is disposed on the first back pressure chamber 14 side of the recess 601. One end of the constant flow spring 70 is accommodated in the recess 601 and the other end is disposed so as to contact the spring base 103.

  The spring base 103 includes an adjusting rod 103a, a spring receiving portion 103b, and a movement position restricting portion 103c. The adjusting rod 103a is disposed so as to penetrate the center of the winding of the constant flow rate spring 79, and one end is exposed to the outside through a hole provided in the center of the upper lid member 102. A spring receiving portion 103b is provided at the other end of the adjusting rod 103a.

  The spring receiving portion 103 b has a bottomed cylindrical shape, and is disposed so as to support the constant flow rate spring 70. The upper end portion of the built-in valve 47 is configured to abut against or be separated from the spring receiving portion 103b.

  A C-ring 145 (seal member) is fitted on the outer end of the upper end of the cylindrical portion of the spring receiving portion 103b. The spring receiving portion 103 b is accommodated so as to enter the inside of the recess 601, and the C ring 145 is in close contact with the inner wall surface of the recess 601. Accordingly, the space surrounded by the spring receiving portion 103b and the recessed portion 601 is closed by the C ring 145, and the second back pressure chamber 15 is formed. Although the C-ring 145 is an annular seal material, a part of its circumference is cut away. The first back pressure chamber 14 and the second back pressure chamber 15 are configured such that water passes through the notch of the C ring 145.

  When the adjusting rod 103a is rotated, the entire spring base 103 moves up and down with respect to the main body 10. The position adjusting member 60 includes a force pushed by a pressure difference between the auxiliary back pressure chamber 12, the first back pressure chamber 14, and the second back pressure chamber 15, a force that the constant flow spring 70 tries to counter, and a position adjusting member. The secondary back pressure chamber 12 is slid to widen (the first back pressure chamber 14 is narrowed) or the secondary back pressure chamber 12 is narrowed (first) by the balance between the sliding resistance applied to the valve body member 40 and the valve body member 40. The back pressure chamber 14 is configured to slide.

  Therefore, by rotating the adjusting rod 103a, the position adjusting member 60 maintains a balance with respect to the pressure difference between the auxiliary back pressure chamber 12, the first back pressure chamber 14, and the second back pressure chamber 15, It is possible to adjust whether positioning is performed.

  The movement position restricting portion 103c is formed to have a larger diameter than the adjustment rod 103a and a smaller diameter than the spring receiving portion 103b. Even when the position adjustment member 60 moves in the direction in which the auxiliary back pressure chamber 12 is expanded, the position adjustment member 60 hits the movement position restricting portion 103c and stops so that the constant flow rate spring 70 is not excessively compressed. It is configured. The movement position restricting unit 103c is adjusted so as to restrict the maximum opening of the main valve (valve) so as not to be narrower than the opening when the primary water pressure becomes the maximum assumed water pressure.

  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. An orifice 221 is provided in the secondary primary flow path 22.

  The first back pressure chamber 14 and the second back pressure chamber are connected to the secondary internal flow path 30 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, the primary pressure is applied to the inside of the first back pressure chamber 14 and the second back pressure chamber. On the other hand, when the electromagnetic valve 82 is opened, first, the water in the first 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 first back pressure chamber 14 decreases. Thereafter, after the water in the second back pressure chamber 15 has passed through the first back pressure chamber 14, it flows out from the bypass flow path 80 to the secondary side internal flow path 30, and the internal pressure in the second back pressure chamber 15 decreases. .

  Next, the operation of the flash valve SV will be described with reference to FIG. 2, FIG. 5, and FIG. As described above, FIG. 2 shows an initial state, FIG. 5 shows a state in which the main valve is opened and water has drained from the first back pressure chamber 14, and FIG. 6 shows water from the second back pressure chamber 15. It shows a state where it is pulled out and balanced.

  When the electromagnetic valve 82 is closed, the same primary pressure as that of the primary side internal flow path 20 is applied to the first back pressure chamber 14, the second back pressure chamber 15, and the auxiliary back pressure chamber 12. The valve body member 40 is also pushed into the outlet 31 side by the primary pressure, and the seating surface packing 45 is in close contact with the boundary surface between the primary side internal flow path 20 and the secondary side internal flow path 30 and is stopped. Since the built-in valve 47 and the built-in valve packing 48 are in contact with each other, the total area (small hole area) of the sub-hole 491 and the communication path (the gap between the built-in valve 47 and the built-in valve holding member 49) is Only the hole 491 has a flow path cross-sectional area.

  Subsequently, when the electromagnetic valve 82 is opened, first, the bypass flow path 80 having a low pressure is communicated with the inside of the first back pressure chamber 14 having a relatively high pressure. Then, the water in the first back pressure chamber 14 flows out to the bypass flow path 80 side. The valve body member 40 is pushed up to the back pressure chamber 14 side. Since the seat surface packing 45 which is the main valve body 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 (see FIG. 5).

  Subsequently, water flows from the second back pressure chamber 15 to the first back pressure chamber 14 and then flows out to the bypass flow path 80. Since the pressure difference between the second back pressure chamber 15 and the auxiliary back pressure chamber 12 is generated, the position adjusting member 60 is pushed down.

  The spring base 103 does not move because it is fixed to the main body 10. Since the constant flow rate spring 70 is disposed between the spring base 103 that does not move and the position adjustment member 60 that moves, the constant flow rate spring 70 contracts and generates a reaction force when the position adjustment member 60 is pushed down. The amount by which the position adjusting member 60 approaches the valve body member 40 is such that the force that the position adjusting member 60 is pressed by the differential pressure between the auxiliary back pressure chamber 12 and the second back pressure chamber 15 and the constant flow spring 70 try to counter it. It is determined by the balance between the force and the sliding resistance applied to the position adjusting member 60 and the valve body member 40.

  When the position adjusting member 60 is pushed down, the valve body member 40 that is raised until it comes into contact with the position adjusting member 60 is also pushed down and moved to a position where the force received from the auxiliary back pressure chamber 12 can be balanced (see FIG. 6). .

  Thereafter, when the electromagnetic valve 82 is closed, water accumulates in the first back pressure chamber 14 through the sub-hole 491 and the communication path (the gap between the built-in valve 47 and the built-in valve holding member 49). Since the built-in valve 47 and the built-in valve packing 48 are separated from each other, water flows from the auxiliary hole 491 and the communication path, and a large amount of water flows into the back pressure chamber 14 at a stretch.

  When a large amount of water flows into the first back pressure chamber 14 at once, 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 built-in valve 47 and the built-in valve packing 48 come into contact with each other, and the communication path is closed. After the built-in valve 47 and the built-in valve packing 48 come into contact, the inflow into the first back pressure chamber 14 is only from the auxiliary hole 491. The valve body member 40 is further pushed down at a slower speed than when forcibly moving to a predetermined lowering reference.

  As described above, the position adjustment member 60 in the present embodiment is configured to adjust the position according to the water pressure of the primary side flow path by receiving the water pressure of the primary side flow path from the sub-back pressure chamber 12, and When the water pressure in the side channel increases, the valve body member 40 moves in the direction of decreasing the movable amount. The back pressure chamber in the present embodiment applies water pressure from the side opposite to the auxiliary back pressure chamber 12 to the first back pressure chamber 14 arranged to apply water pressure to the valve body member 40 and the position adjusting member 60. And the second back pressure chamber 15 arranged as described above. The second back pressure chamber 15 is connected to the secondary flow path through the first back pressure chamber 14.

  According to the present embodiment, the valve body member 40 is driven by a differential pressure between the water pressure received from the flow path side and the water pressure received from the first back pressure chamber 14 side, and the position adjusting member 60 is received from the auxiliary back pressure chamber 12. It is driven by the differential pressure between the water pressure and the water pressure received from the second back pressure chamber 15 side. In the case of this embodiment, the second back pressure chamber 15 is connected to the secondary flow path through the first back pressure chamber 14, so that the valve is opened by draining water from the back pressure chamber to the secondary flow path. If it carries out, water will be first drained from the 1st back pressure chamber 14, and water will be drained from the 2nd back pressure chamber 15 after that. Therefore, since the first back pressure chamber 14 is depressurized before the second back pressure chamber 15, the valve body member 40 is driven before the position adjusting member 60 and the main valve is greatly opened. Thereafter, since the water is drained from the second back pressure chamber 15 and the pressure is reduced, the position adjusting member 60 moves to the valve body member side 40 and moves to a predetermined balance position (see FIGS. 5 and 6).

  Accordingly, in the flow rate adjustment stage, the position adjustment member 60 moves in one direction to push the valve body member 40 in the valve closing direction, so that variations due to changes in the sliding direction are unlikely to occur. Therefore, it is possible to suppress variations in the opening of the main valve and the constant flow valve and variations in the amount of cleaning water supplied by the flow path opening / closing device. Furthermore, when water is introduced into the back pressure chamber during the valve closing operation, water can be introduced first from the first back pressure chamber 14, so that water pressure is applied to the valve body member 40 at the initial stage of water introduction. This does not adversely affect the closing speed of the main valve.

  In the present embodiment, a C ring 145 that is an annular seal member with a part of the outer periphery cut away so as to contact the position adjusting member 60 is disposed, and the first back pressure is applied by the C ring 145 that is the seal member. The chamber 14 and the second back pressure chamber 15 are partitioned.

  By sealing between the two back pressure chambers with a C ring 145 which is an annular seal member with a part of the outer periphery cut off, it is possible to achieve both appropriate flow resistance and sliding resistance. The communication channel that connects the first back pressure chamber 14 and the second back pressure chamber 15 is formed at the cutout portion provided in the C ring 145 that is a seal member, so that no hole is provided in each member. The communication channel can be configured simply.

  In this embodiment, the flow resistance of the water flowing from the second back pressure chamber 15 to the first back pressure chamber 14 is larger than the flow resistance of the water flowing from the first back pressure chamber 14 to the secondary flow path. .

  Thus, there is a large speed difference between the speed at which water flows from the second back pressure chamber 15 to the first back pressure chamber 14 and the speed at which water flows from the first back pressure chamber 14 to the secondary flow path. The main valve body can be reliably opened first.

10: Body 12: Sub back pressure chamber 14: First back pressure chamber 15: Second back pressure chamber 20: Primary side internal flow path 21: Inlet 22: Sub primary flow path 30: Secondary side internal flow path 31 : Outlet port 40: Valve body member 42: Valve upper member 43: Filter member 44: Fixing member 45: Seat surface packing 46: Valve lower member 47: Built-in valve 48: Built-in valve packing 49: Built-in valve holding member 60: Position adjustment Member 80: Bypass channel 82: Solenoid valve 101: Main body member 102: Upper lid member 103: Spring base 103a: Adjustment rod 103b: Spring receiving portion 103c: Movement position restricting portion 145: C ring 201: Main valve seat surface 221: Orifice 421: Vertical internal flow path 422: Vertical internal flow path 423: Horizontal internal flow path 461: Outer surface 462: Slit 463: Hole 464: Hole 466: Top surface 467: Side wall surface 468: Upper side wall surface 469: Parts side wall 491: sub-ports 601: recess SB: toilet SV: flush valve SW: seal water portion TB: water supply pipe V: stop cock VB: vacuum breaker Wa: influent Wb: effluent water

Claims (3)

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,
A position adjusting member, at least a part of which moves along the sliding direction of the valve body member so as to adjust the movable amount of the valve body member formed by integrating the main valve body and the constant flow valve body; ,
A back pressure chamber and a sub back pressure chamber provided to apply force to the position adjustment member from opposite sides, respectively.
The position adjusting member is configured to adjust the position according to the water pressure of the primary side flow path by receiving the water pressure of the primary side flow path from the auxiliary back pressure chamber, and the water pressure of the primary side flow path When it increases, the valve body member moves in a direction to decrease the movable amount,
The back pressure chamber is
A first back pressure chamber arranged to apply water pressure to the valve body member, and a second back pressure chamber arranged to apply water pressure to the position adjusting member from the side opposite to the auxiliary back pressure chamber. And having
The flow path opening / closing apparatus, wherein the second back pressure chamber is connected to the secondary flow path through the first back pressure chamber.   2. An annular seal member having a part of the outer periphery cut out on the position adjusting member, and the first back pressure chamber and the second back pressure chamber are partitioned by the seal member. The flow path opening and closing device according to 1.   A flow path resistance of water flowing from the second back pressure chamber to the first back pressure chamber is larger than a flow path resistance of water flowing from the first back pressure chamber to the secondary side flow path. The flow path opening and closing device according to claim 1 or 2.