JP2012077473A - Vacuum valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum valve device surely operating without reference to the degree of vacuum in a vacuum water pipe.SOLUTION: A vacuum valve device includes: a vacuum valve 10 which is opened when the degree of vacuum inside a pressure chamber 37 becomes equal to or higher than the set degree Ps of vacuum and which is closed when the degree of vacuum inside the pressure chamber 37 becomes lower than the set degree Ps of vacuum; a first actuator 90 which switches so that the degree of vacuum inside the pressure chamber 37 can become equal to or higher than the set degree of vacuum, when water in a water storage basin 1 reaches a first water level; and a second actuator 95 switches so that the degree of vacuum inside the pressure chamber 37 can become lower than the set degree of vacuum, when the water in the water storage basin 1 reaches a second water level. A first pressure detecting chamber 20, in which an opening area enabling the passage of a fluid is larger than an opening area of a vacuum water pipe 5, is provided on the downstream side of a valve seat 18 of the vacuum valve 10. The second actuator 95 is divided into a first pressure receiving chamber 123 communicating with the first pressure detecting chamber 20 of the vacuum valve 10, and a second pressure receiving chamber 124 lower in the degree of vacuum than the inside of the first pressure receiving chamber 123. When the water level in the water storage basin 1 reaches the second water level, switching is performed so that the degree of vacuum inside the pressure chamber 37 of the vacuum valve 10 can become lower than the set degree of vacuum by differential pressure ΔP.

Description

  The present invention relates to a vacuum valve device used in a vacuum water supply system such as a vacuum sewer system.

  2. Description of the Related Art A vacuum type water supply system that performs water supply using vacuum suction is known. An example of this vacuum water supply system is a vacuum sewer system. The vacuum sewer system includes a vacuum station, a vacuum water pipe, and a vacuum valve unit.

  The vacuum station includes a vacuum pump, a water collection tank, and a pressure pump. The upstream side of the vacuum water pipe is connected to the vacuum valve unit, and the downstream side is connected to the water collection tank of the vacuum station. The vacuum pump of the vacuum station generates a negative pressure in the vacuum water pipe. Due to the negative pressure in the vacuum water pipe, the sewage in the vacuum valve unit passes through the vacuum water pipe and drains into the water collection tank of the vacuum station. The sewage stored in the water collection tank is further conveyed downstream by a pressure pump.

  The vacuum valve unit includes a water tank that temporarily stores sewage transported from the upstream sewage facility. Inside the water reservoir, a vacuum valve device including a vacuum valve and a controller for opening and closing the vacuum valve is disposed.

  The vacuum valve is interposed between the water suction pipe whose lower end is located in the water storage tank and the vacuum water supply pipe. The vacuum valve includes a valve body including a valve body and a valve seat, and a drive unit that drives the valve body to open and close. Then, when the valve is closed, the communication between the water suction pipe and the vacuum water supply pipe is shut off, and when the valve is opened, the water suction pipe and the vacuum water supply pipe are communicated to supply the sewage in the reservoir to the vacuum water supply pipe. Note that the driving unit includes two pressure chambers. The valve element is driven by a balance between the pressing force of the piston generated by the pressure difference in the pressure chamber and the urging force of the urging spring.

  The controller of the vacuum valve device described in Patent Document 1 includes a mechanical first actuator that only opens the vacuum valve and a pneumatic second actuator that only closes the vacuum valve. . The first actuator has a three-way valve structure that switches the gas pressure in the pressure chamber of the vacuum valve in conjunction with the raising and lowering of the float. The second actuator has a two-way valve structure that switches the gas pressure in the pressure chamber of the vacuum valve in conjunction with a change in the degree of vacuum in the vacuum water pipe.

  In this vacuum valve device, when sewage accumulates in a water reservoir to a preset first water level, the first actuator switches the vacuum valve from the closed state to the open state. Further, when the sewage in the water storage tank reaches the second water level below the lower end of the water absorption pipe, the second actuator switches the vacuum valve from the open state to the closed state. As a result, the vacuum valve device of Patent Document 1 can discharge scum floating on the water surface together with sewage.

  Generally, in a vacuum sewer system, a plurality of vacuum valve units are connected to one vacuum station. Each vacuum valve unit has a different degree of vacuum of the vacuum water supply pipe, which is a suction force to the vacuum station, depending on the distance from the vacuum station and the piping structure (resistance) of the vacuum water supply pipe. For example, the vacuum valve unit close to the vacuum station has a higher degree of vacuum in the vacuum water pipe than the far vacuum valve unit.

  The second actuator of Patent Document 1 includes a communication chamber connected to the vacuum water pipe, an atmospheric pressure chamber connected to the atmosphere, and a spring disposed in the communication chamber. When the water level in the reservoir is higher than the second water level, the urging force of the spring is below the pressure of the piston generated by the differential pressure between the negative pressure in the communication chamber and the atmospheric pressure in the atmospheric pressure chamber. When the water level in the reservoir becomes lower than the second water level, the vacuum level of the vacuum water supply pipe decreases due to air mixing and the negative pressure in the communication chamber decreases, whereby the urging force of the spring is reduced between the communication chamber and the atmospheric pressure chamber. Above differential pressure. As a result, the position of the valve body of the two-way valve structure is switched to the position for closing the vacuum valve by the biasing force of the spring. That is, the timing for closing the vacuum valve is determined by the degree of vacuum (suction force) of the vacuum water pipe and the biasing force of the spring.

  In a vacuum valve unit connected to a vacuum water supply pipe with a high degree of vacuum (for example, -70 kPa), even if the water level in the reservoir drops to the second water level, the negative pressure of the vacuum water supply pipe is insufficiently reduced. If the biasing force of the spring of the second actuator is small, the pressure difference between the communication chamber and the atmospheric pressure chamber cannot be exceeded (the vacuum valve cannot be closed). Therefore, in the vacuum valve unit connected to the high-vacuum vacuum water supply pipe, it is necessary to set a large biasing force of the spring of the second actuator. On the other hand, in a vacuum valve unit connected to a vacuum water supply pipe having a low degree of vacuum (for example, −25 kPa), if the urging force of the spring of the second actuator is large, the water level in the reservoir is reduced to the second water level. Immediately above the pressure difference between the atmospheric pressure chamber and the vacuum valve closes. Therefore, in the vacuum valve unit connected to the low-vacuum vacuum water supply pipe, it is necessary to set the biasing force of the spring of the second actuator small.

  Therefore, the second actuator of the vacuum valve unit needs to be provided with a spring having an appropriate urging force according to the actual degree of vacuum of the vacuum water pipe connecting the vacuum valve. In other words, since the second actuator of Patent Document 1 cannot use a common spring for all the vacuum valve units, workability at the time of system construction is extremely poor.

  In addition, since the second actuator for high degree of vacuum has a large biasing force of the spring, a pressure setting error for closing operation also increases. Therefore, it is extremely difficult to keep the vacuum valve open to the target suction air amount. As a result, the scum floating on the water surface may not be sufficiently discharged.

Japanese Patent No. 2805127

  It is an object of the present invention to provide a vacuum valve device that operates reliably regardless of the degree of vacuum in the vacuum water pipe.

In order to solve the above-mentioned problem, the vacuum valve device of the present invention is interposed between the other end of the water suction pipe whose one end is opened in the water storage tank and the vacuum water supply pipe to be vacuum-sucked, and the pressure chamber is at or above a set vacuum And the valve body is opened away from the valve seat, and when the pressure chamber falls below a set vacuum level, the valve body is seated on the valve seat and closed, and the water reservoir When the water level reaches a preset first water level higher than one end of the water absorption pipe, a first actuator that switches the pressure chamber of the vacuum valve to a set vacuum level or higher, and the water level in the water storage tank And a second actuator that switches the pressure chamber of the vacuum valve so as to fall below a set vacuum degree when the second water level for sucking liquid together with air from one end is provided. Downstream of the vacuum water pipe A first pressure sensing chamber having a larger opening area through which fluid can pass than a mouth area is provided, and the second actuator is connected to the first pressure sensing chamber of the vacuum valve and the first pressure receiving chamber. When the water pressure in the reservoir is divided to a second water level, the pressure chamber of the vacuum valve is set to a set vacuum degree by the differential pressure between the first and second pressure receiving chambers. It is set as the structure switched so that it may fall below.
Here, the “second pressure receiving chamber whose degree of vacuum is lower than that of the first pressure receiving chamber” includes an atmospheric pressure state in which the second pressure receiving chamber is opened to the atmosphere.

  Since this vacuum valve device is provided with a first pressure detection chamber having an opening area larger than that of the vacuum water supply pipe on the downstream side of the valve seat of the vacuum valve, in the drained state, the vacuum degree in the first pressure detection chamber is controlled by vacuum water supply. The degree of vacuum in the tube can be made lower. As a result, the second actuator can reduce the differential pressure between the first pressure receiving chamber and the second pressure receiving chamber communicating with the first pressure detecting chamber. Therefore, a common vacuum valve device can be installed regardless of the actual degree of vacuum in the vacuum water pipe. Further, since the differential pressure between the first and second pressure receiving chambers is small, the setting error of the second actuator is also small, so that it is possible to reliably perform vacuum suction to the target suction air amount.

  In this vacuum valve device, a second pressure detection chamber having a larger opening area through which fluid can pass than the opening area of the valve opening in the valve seat is provided upstream of the valve seat of the vacuum valve. It is preferable that the second pressure receiving chamber of the second actuator communicate with the chamber. In this way, the differential pressure between the first and second pressure receiving chambers can be further reduced. Therefore, the vacuum valve can be reliably closed regardless of the degree of vacuum in the vacuum water supply pipe, and vacuum suction can be performed up to the target suction air amount.

  In this case, it is preferable that an air communication portion communicating with the atmosphere is provided in the second pressure receiving chamber of the second actuator, and an intake member capable of adjusting the intake amount of the air is disposed in the opening of the air communication portion. . Here, “adjusting the amount of intake of the atmosphere” includes the amount of intake “0” that blocks the atmosphere communication portion. In this way, the internal pressure of the second pressure receiving chamber can be adjusted. Therefore, the closing operation of the vacuum valve by the second actuator can be reliably set to the target value.

  Further, a casing forming a first variable pressure chamber communicated with the downstream side of the first pressure detection chamber and a second variable pressure chamber communicated with the pressure chamber of the vacuum valve, and the first and second variable pressure chambers communicated with each other. A switching valve body disposed in the casing so as to be capable of direct movement between an open position to be closed and a closed position to block communication between the first and second variable pressure chambers, and an open position and a closed position of the switching valve body Provided with a holding mechanism for holding with a preset holding force, and when the water level in the reservoir reaches the first water level, the switching valve body of the switching valve mechanism is closed by the first actuator. When the water level in the water storage tank reaches the second water level, the switching valve body of the switching valve mechanism is moved from the open position by the second actuator. Holding the holding mechanism in the closed position By moving against, it is preferable that the first and second actuator switches the vacuum in the pressure chamber of the vacuum valve.

  This vacuum valve device has a configuration in which the pressure chamber of the vacuum valve is connected only to the second variable pressure chamber of the switching valve mechanism. The first variable pressure chamber of the switching valve mechanism is connected to the downstream side of the first pressure detection chamber. The first and second variable pressure chambers are switched between communication and blocking by an opening operation by the first actuator and a closing operation by the second actuator with respect to one switching valve body. Moreover, the switching valve body is held in the open position and the closed position by the holding force of the holding mechanism. Therefore, if the switching valve body is in the closed position and the valve body of the vacuum valve is in the closed position, the pressure chamber of the vacuum valve will not exceed the set vacuum level unless the switching valve body is moved to the open position. . Further, if the switching valve body is in the open position and the valve body of the vacuum valve is in the open position, the pressure chamber of the vacuum valve does not fall below the set vacuum level unless the switching valve body moves to the closed position. Therefore, the vacuum valve can be reliably opened and closed.

  In this case, the second variable pressure chamber of the casing of the switching valve mechanism includes a sealing member having a through hole communicating with the atmosphere, and the switching valve body has the through hole of the sealing member in a state of being moved to the open position. It is preferable to block the second variable pressure chamber from the atmosphere and to open the through hole of the seal member in a state where the second variable pressure chamber is moved to the closed position so that the second variable pressure chamber communicates with the atmosphere. In this way, when the switching valve body is moved to the closed position by the second actuator, the atmosphere can be introduced into the pressure chamber of the vacuum valve via the second variable pressure chamber. Therefore, the vacuum valve can be reliably closed.

The second actuator contracts when the pressing force of the switching piston cup disposed in the first pressure receiving chamber and the switching piston cup due to the differential pressure in the first and second pressure receiving chambers exceeds the biasing force. On the other hand, the switching piston cup has an urging spring that expands when the pressing force of the switching piston cup due to the differential pressure becomes equal to or less than the urging force. It is preferable to connect a closing operation member that moves the valve from the open position to the closed position.
In this case, it is preferable to provide an adjustment mechanism for adjusting the urging force of the urging spring in the second actuator.
In this way, the set value for operating the closing operation member can be finely adjusted. As a result, the amount of suction air can be adjusted according to the environment (scum amount) at the installation location of the vacuum valve unit. And in a vacuum valve unit with a lot of scum, by increasing the amount of suction air, it is possible to reliably prevent a drainage trouble due to the residual scum being cured. Further, in a vacuum valve unit with a small scum, an energy saving operation can be realized by reducing the amount of suction air, and a decrease in the degree of vacuum of other vacuum valve units can be suppressed.

  In the vacuum valve device of the present invention, a first pressure detection chamber having a vacuum level lower than the vacuum level in the vacuum water supply pipe is provided on the downstream side of the valve seat of the vacuum valve, and the second pressure sensor of the second actuator is provided in the first pressure detection chamber. Since the first pressure receiving chamber is in communication, the differential pressure between the first and second pressure receiving chambers can be reduced. In addition, a second pressure detection chamber having a lower degree of vacuum is provided on the upstream side of the valve seat of the vacuum valve, and the second pressure receiving chamber of the second actuator is communicated with the second pressure detection chamber. The pressure difference between the two pressure receiving chambers can be further reduced. Therefore, a common vacuum valve device can be installed regardless of the actual vacuum degree of the vacuum water pipe. In addition, since the differential pressure between the first and second pressure receiving chambers is small, it can be operated reliably.

It is the schematic which shows the vacuum-type sewer system to which the vacuum valve apparatus of this invention is applied. It is a conceptual diagram of the vacuum valve apparatus of 1st Embodiment. It is sectional drawing which shows the structure of the vacuum valve of a vacuum valve apparatus. It is a principal part expanded sectional view of FIG. It is an upper perspective view of a controller. (A), (B) is sectional drawing which shows the structure of the controller of a vacuum valve apparatus. (A) is a perspective view which shows the casing and holding mechanism of a switching valve mechanism, (B) is sectional drawing of a casing, (C) is a perspective view of a holding mechanism. It is a disassembled perspective view which shows the valve body for switching. It is a disassembled perspective view which shows a 2nd actuator. It is the schematic which shows the non-operation state of a vacuum valve apparatus. It is the schematic which shows the state which the valve body for switching opened by the 1st actuator. It is the schematic which shows the state which the valve body of the vacuum valve opened by FIG. 10B. It is the schematic which shows the state which air mixed by drainage and the vacuum degree fell. It is the schematic which shows the state which the valve body for switching closed by the 2nd actuator. It is the schematic which shows the state which the valve body of the vacuum valve closed by FIG. 10E. It is a graph which shows the change of the differential pressure | voltage of the 1st pressure detection chamber at the time of drainage at the time of drainage at the time of connecting to the vacuum water supply pipe from which a degree of vacuum differs. (A) is sectional drawing which shows the structure of the controller of the vacuum valve apparatus of 2nd Embodiment, (B) is a perspective view which shows the lower case of the 2nd actuator of a controller.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a vacuum valve unit of a vacuum sewer system which is an example of a vacuum water supply system to which a vacuum valve device of the present invention is applied. In the vacuum sewer system, a vacuum valve unit is disposed between a home sewage facility and a vacuum station. The vacuum valve unit has a water reservoir 1 for temporarily storing sewage, and the vacuum valve device of the present invention is disposed in the water basin 1, and the sewage in the water reservoir 1 is downstream by a vacuum suction action by a vacuum station. Drain into the side water collection tank.

  The reservoir 1 has a bottomed cylindrical shape, and an upper end opening thereof is closed by a lid 2. A sewage reservoir 3 for storing sewage is provided at the bottom of the water reservoir 1. The reservoir 1 is connected to a natural downflow pipe 4 in an atmospheric pressure state with an upstream side communicating with a domestic sewage facility above the sewage reservoir 3. Furthermore, a negative pressure (-25 to -70 kPa) vacuum water supply pipe 5 is connected to the reservoir 1 so that the downstream side is connected to the water collection tank of the vacuum station so as to be located above the natural flow down pipe 4. ing. An air intake pipe 6 that is open to the atmosphere is connected to the water reservoir 1 so as to be positioned further above the vacuum water pipe 5.

  In the water reservoir 1, a gate valve 7, a water absorption pipe 8, and a vacuum valve device are accommodated. A gate valve 7 is interposed in the vacuum water pipe 5 and a water suction pipe 8 is connected through a vacuum valve 10 of a vacuum valve device. The gate valve 7 is closed by manual operation at the time of new construction or maintenance of the vacuum sewer system, and cuts off the communication between the vacuum valve 10 and the vacuum station via the vacuum water supply pipe 5. In addition, the valve is opened during normal use after new construction or maintenance, and the vacuum valve 10 and the vacuum station are communicated with each other via the vacuum water supply pipe 5. The water absorption pipe 8 is piped so that the opening at one end is located above the bottom of the sewage reservoir 3 at a predetermined interval (50 to 100 mm).

  The vacuum valve device of the present invention includes a vacuum valve 10 and a controller 50 that opens and closes the vacuum valve 10. As shown in FIG. 2, the controller 50 includes a first actuator 90 that is dedicated to opening a valve using a float 91 and a second actuator 95 that is dedicated to closing a valve due to a differential pressure (pressure difference). Yes. In the present invention, the first and second pressure detection chambers 20 and 24 are provided in the vacuum valve 10, these internal pressures (vacuum degrees) are received by the second actuator 95, and the vacuum valve 10 is closed by the differential pressure ΔP. It is set as the structure which makes it valve.

  As shown in FIG. 3, the vacuum valve 10 includes a tube body 11 interposed between the gate valve 7 and the water absorption pipe 8, a water stop valve body 26 disposed in the pipe body 11, A water stop valve drive actuator 27 for opening and closing the water stop valve body 26 is provided. The first pressure detection chamber 20 is provided on the downstream side of the valve seat 18 formed in the tube body 11, and the second pressure detection chamber 24 is provided on the upstream side of the valve seat 18.

  The tube body 11 includes a water absorption portion 12 and a discharge portion 14 that form a straight tube. The water absorption part 12 is connected to the water absorption pipe 8 via the vent pipe 13, and its inner diameter is D1. The discharge part 14 is provided with a joint member 15 at an open end, and is connected to the vacuum water supply pipe 5 via the joint member 15. The discharge part 14 has an inner diameter D2 larger than the water absorption part 12 (D1 <D2). The discharge part 14 is in a positional relationship in which the axial center is positioned in parallel with the axial center of the water absorbing part 12, and the lower top is in contact with the water absorbing part 12 as shown in FIG. 4. The joint member 15 is provided with a vacuum water pipe connecting portion 16 having substantially the same inner diameter D1 as the water absorbing portion 12.

  Further, as shown in FIG. 3, the tube body 11 is provided with a valve body disposing portion 17 that displaces a water stop valve body 26. This valve body arrangement | positioning part 17 is branched and provided between the water absorption part 12 and the discharge part 14 so that an acute angle may be crossed. Specifically, the valve body disposing portion 17 is provided at an acute angle with respect to the water absorption portion 12 side and at an obtuse angle with respect to the discharge portion 14 side. A valve seat 19 having a circular shape is provided inside the valve body disposing portion 17 by projecting a valve seat 18 from the inner wall of the tube body 11. The valve port 19 extends in a direction orthogonal to the axis of the valve body arrangement portion 17, and the center thereof coincides with the axis of the valve body arrangement portion 17. Further, the inner diameter of the valve port 19 is D1 that is substantially the same inner diameter as the water absorbing portion 12.

  The tube body 11 is formed with a first pressure detection chamber 20 made of the internal space of the discharge portion 14 on the downstream side of the valve seat 18, and made of the internal space of the valve body arrangement portion 17 on the upstream side of the valve seat 18. A second pressure detection chamber 24 is formed. The first pressure detection chamber 20 has an opening area through which a fluid can pass, which is larger than an opening area of the downstream vacuum water pipe connecting portion 16 (vacuum water pipe 5). A first pressure receiving chamber connecting portion 21 for connecting to a first pressure receiving chamber 123 of a second actuator 95 to be described later is provided on the upper top portion of the first pressure detecting chamber 20. In addition, a pair of baffle plates 22 </ b> A and 22 </ b> B for preventing drainage from entering the first pressure receiving chamber connecting portion 21 is provided in the upper portion of the first pressure detection chamber 20. The baffle plates 22A and 22B are provided with vent holes 23a and 23b that allow gas to pass therethrough, respectively. A second pressure receiving chamber connecting portion 25 for connecting to the second pressure receiving chamber 124 of the second actuator 95 is provided on the upper top portion of the second pressure detecting chamber 24. In the second pressure detection chamber 24, the opening area through which the fluid can pass is larger than the opening area of the downstream valve port 19.

  In the tube body 11 configured in this way, the opening area through which the fluid can pass is narrowed by the valve port 19 and the vacuum water pipe connecting portion 16. As a result, when draining through the tube body 11, the pressure is reduced when passing through the valve port 19, and further reduced when passing through the vacuum water pipe connecting portion 16. As a result, the degree of vacuum is higher in the first pressure detection chamber 20 downstream of the valve port 19 than in the second pressure detection chamber 24 upstream of the valve port 19. Furthermore, the vacuum water pipe 5 on the downstream side of the vacuum water pipe connecting portion 16 is higher than the first pressure detection chamber 20 on the upstream side of the vacuum water pipe connecting portion 16.

  The water stop valve body 26 is disposed so as to be movable back and forth along the axis of the valve body disposition portion 17 by a water stop valve drive actuator 27. The opening and closing of the vacuum valve 10 is switched by a water stop valve body 26. When the water stop valve body 26 is advanced by the water stop valve driving actuator 27, the water stop valve body 26 is seated on the valve seat 18 to close the valve port 19, and the vacuum valve 10 is closed. When the vacuum valve 10 is closed, the communication between the water absorption part 12 and the discharge part 14 is blocked. When the vacuum valve 10 is closed, the water absorption part 12 and the valve body disposition part 17 are in the atmospheric pressure (atmospheric release) state via the water absorption pipe 8, and the discharge part 14 is connected via the gate valve 7 and the vacuum water supply pipe 5. Due to the vacuum suction action of the connected vacuum station, a negative pressure state lower than the atmospheric pressure is obtained. On the other hand, when the water stop valve body 26 is retracted by the water stop valve driving actuator 27, the water stop valve body 26 is separated from the valve seat 18 to open the valve port 19, and the vacuum valve 10 is opened. The water absorption part 12 and the discharge part 14 are communicated by opening the vacuum valve 10. When the vacuum valve 10 is opened, the water suction pipe 8, the water absorption part 12, the valve body disposing part 17 and the discharge part 14 are connected to the atmospheric pressure by the vacuum suction action of the vacuum station connected via the gate valve 7 and the vacuum water supply pipe 5. A lower negative pressure state is obtained.

  The water stop valve drive actuator 27 is provided with an opening / closing operation member 41 for opening and closing the water stop valve body 26 in a water stop cylinder 28 having an interior divided into a pressure chamber 37 and a reference pressure chamber 36. is there. The water stop cylinder 28 includes a first lower case 29, a first upper case 32, a first diaphragm 35, a first piston cup 38, and a first biasing spring 40.

  The first lower case 29 is made of a cylindrical member having an upper end opening that is attached to the upper end opening of the valve body disposing portion 17 of the tubular body 11 in a sealed state. The lower closing portion of the first lower case 29 has a conical cylindrical shape that protrudes into the valve body disposing portion 17. And the 1st penetration member 30 which penetrates the opening-and-closing operation member 41 is arrange | positioned so that it may be located in the axial center of the valve body arrangement | positioning part 17. As shown in FIG. In addition, a vent hole 31 is provided in the outer peripheral portion of the first lower case 29 to communicate with the atmosphere.

  The first upper case 32 is made of a cylindrical member having a lower end opening that is attached to the upper end opening of the first lower case 29 in a sealed state. A second variable pressure chamber connecting portion 33 connected to the second variable pressure chamber 58 of the switching valve mechanism 51 of the controller 50 is provided in the upper closing portion of the first upper case 32. In addition, a positioning cylinder portion 34 that stops the upward movement of the first piston cup 38 and positions the upper portion of the first urging spring 40 is provided in the upper closing portion of the first upper case 32.

  The first diaphragm 35 is made of a flexible material that divides the inside of the water stop cylinder 28 into a reference pressure chamber 36 located on the valve body disposing portion 17 side and a pressure chamber 37 located on the separated upper side. It will be. The first diaphragm 35 is integrally assembled with the outer peripheral portion sandwiched between the first lower case 29 and the first upper case 32. Note that the reference pressure in the reference pressure chamber 36 of the present embodiment is set to atmospheric pressure by the vent hole 31 formed in the first lower case 29.

  The first piston cup 38 has a saucer shape having an upper end opening whose inner diameter is larger than the outer diameter of the positioning cylinder portion 34. The first piston cup 38 is disposed with its lower bottom fixed to the first diaphragm 35 so as to be positioned in the pressure chamber 37 of the water stop cylinder 28. Specifically, by arranging a plate-shaped first sandwiching member 39 on the side of the reference pressure chamber 36 of the first diaphragm 35, the first sandwiching member 39 and the first piston cup 38 have a first The diaphragm 35 is sandwiched and attached.

  The first urging spring 40 is disposed between the upper closing portion of the first upper case 32 and the first piston cup 38. The first biasing spring 40 biases the water stop valve body 26 toward the closed position via the first piston cup 38 and the opening / closing operation member 41. Further, when the pressure in the pressure chamber 37 becomes equal to or higher than the set vacuum degree Ps lower than the atmospheric pressure, the first urging spring 40 has a degree of vacuum (negative pressure) in the pressure chamber 37 and an atmospheric pressure in the reference pressure chamber 36. The first piston cup 38 contracts due to the balance of the force with the pressing force of the first piston cup 38 generated by the differential pressure. Specifically, when the degree of vacuum in the pressure chamber 37 reaches Ps, the first biasing spring 40 falls below the pressing force due to the pressure difference from the atmospheric pressure of the reference pressure chamber 36, and the first piston cup 38 moves ( It begins to contract gradually with the pressing force (vacuum suction force) due to retreat. Then, when the degree of vacuum in the pressure chamber 37 becomes Ps ′ (Ps <Ps ′) higher than the set degree of vacuum Ps, the pressure chamber 37 is completely contracted. On the other hand, when the pressure chamber 37 falls below the set vacuum degree Ps ′, it exceeds the pressing force due to the pressure difference from the atmospheric pressure of the reference pressure chamber 36 and resists the pressing force in the backward direction of the first piston cup 38. It grows gradually. When the pressure chamber 37 falls below the set vacuum level Ps, the pressure chamber 37 is completely extended.

  The opening / closing operation member 41 includes a rod connected to the center of the bottom of the first piston cup 38. The opening / closing operation member 41 is inserted through the first insertion member 30 of the first lower case 29 and extends along the axis of the valve body disposing portion 17. And the water stop valve body 26 is connected with the front-end | tip. The opening / closing operation member 41 may be integrally provided in a state of being connected to the first piston cup 38, and may be connected to the water stop valve body 26, or may be provided integrally with the water stop valve body 26. The piston cup 38 may be integrally connected.

  Next, a schematic configuration of the controller 50 that controls opening and closing of the vacuum valve 10 will be described.

  As shown in FIG. 2, the controller 50 includes a switching valve mechanism 51 having a three-way valve structure. The switching valve mechanism 51 is opened by a first actuator 90 that is interlocked with the raising and lowering of the float 91. When the switching valve mechanism 51 is actuated to the open position, the vacuum water supply pipe 5 and the pressure chamber 37 of the vacuum valve 10 are communicated to open the vacuum valve 10. The switching valve mechanism 51 is closed by a second actuator 95 that operates based on the differential pressure ΔP in the first and second pressure detection chambers 20 and 24. When the switching valve mechanism 51 is actuated to the closed position, the communication between the vacuum water supply pipe 5 and the pressure chamber 37 of the vacuum valve 10 is shut off, and the pressure chamber 37 is opened to the atmosphere. As a result, the pressure chamber 37 is lowered below the set vacuum degree Ps, and the vacuum valve 10 is closed.

  Specifically, as shown in FIGS. 5 and 6A and 6B, the controller 50 opens the switching valve mechanism 51 having one switching valve body 70 and the switching valve body 70. A first actuator 90 for closing, and a second actuator 95 for closing the switching valve body 70. Then, by switching the switching valve body 70 by the first and second actuators 90 and 95, the degree of vacuum in the pressure chamber 37 of the vacuum valve 10 is switched, and the vacuum valve 10 is opened and closed.

  The switching valve mechanism 51 includes a casing 52, a switching valve body 70 disposed in the casing 52 so as to be directly movable, and a holding mechanism that holds the switching valve body 70 in an open position and a closed position. ing.

  As shown in FIGS. 5, 7 </ b> A, and 7 </ b> B, the casing 52 includes a lower vacuum valve connecting portion 55 and an upper actuator connecting portion 61. The casing 52 is provided with a fixing arm portion 53. The fixing arm 53 is connected to a holder 54 (see FIGS. 6A and 6B), and is fixed to a predetermined portion in the water reservoir 1 through the holder 54.

  The vacuum valve connecting portion 55 includes a first variable pressure chamber 56 that communicates with the vacuum water supply pipe 5 on the downstream side of the first pressure detection chamber 20 and a second variable pressure chamber 58 that communicates with the pressure chamber 37 of the vacuum valve 10. Is formed. The first variable pressure chamber 56 is located at the lower end, and a vacuum water pipe connecting portion 57 projects outwardly in the radial direction on the outer periphery thereof. The second variable pressure chamber 58 is located in the upper part along the axial direction of the first variable pressure chamber 56, and has an inner diameter larger than that of the first variable pressure chamber 56. In the second variable pressure chamber 58, a pressure chamber connecting portion 59 is provided on the outer peripheral portion so as to project outward in the radial direction. Between these variable pressure chambers 56 and 58, a pressure contact portion 60 to which the switching valve body 70 is pressed is provided. The pressure contact portion 60 has an inverted conical cylindrical shape whose inner diameter gradually increases upward.

  The actuator connecting portion 61 has a cylindrical shape that extends upward with an inner diameter larger than that of the second variable pressure chamber 58 that is an upper portion of the vacuum valve connecting portion 55. A sealing pressure contact step 62 is formed at a boundary portion between the vacuum valve connecting portion 55 and the actuator connecting portion 61. Above the pressure contact step portion 62, slit-like insertion holes 63, 63 cut out so as to communicate with the internal space of the actuator connecting portion 61 are provided. An arrangement portion 64 of a toggle member 85 constituting a holding mechanism is provided above the insertion hole 63. The toggle member disposing portion 64 is disposed between the pair of elastic holding portion insertion grooves 65 and 65 extending in parallel to the insertion holes 63 and 63 so as to communicate with the internal space of the actuator connecting portion 61. Thus, a locking piece 66 protruding in the opposite direction with respect to the fixing arm 53 is provided. Further, the actuator connecting portion 61 is provided with an insertion groove 67 extending vertically along the axial direction and communicating with the internal space so as to be positioned between the fixing arm portions 53 adjacent to each other in the lateral direction. . Further, the actuator connecting portion 61 is provided with a guide groove 68 extending from the upper end to the elastic holding portion insertion groove 65. Also, a bracket portion 69 having an oval shape in plan view for connecting the second actuator 95 is provided at the upper end of the actuator connecting portion 61. The bracket portion 69 is provided with a connecting hole so as to be positioned on the outer periphery on the long diameter side.

  The switching valve body 70 includes a valve rod 71, a valve packing 78, a guide member 81, a seal member 82, and reinforcing members 84A and 84B. The switching valve body 70 is in an open position where the valve packing 71 communicates with the first and second variable pressure chambers 56 and 58 of the casing 52 when the valve rod 71 is directly moved upward by the first actuator 90 (see FIG. 10B). Further, when the valve rod 71 is linearly moved downward by the second actuator 95, the valve packing 78 is pressed against the pressed contact portion 60, and the communication between the first and second variable pressure chambers 56, 58 of the casing 52 is blocked. It is moved to the closed position (see FIG. 10E).

  The valve rod 71 extends from the inside of the vacuum valve connecting portion 55 to the inside of the actuator connecting portion 61. As shown in FIG. 8, a packing attachment portion 72 for attaching the valve packing 78 is provided at the lower end of the valve rod 71. Above the packing mounting portion 72, a stopper portion 73 having an enlarged diameter for positioning the upper end of the guide member 81 is provided. An upper portion of the stopper portion 73 is provided with a pressing portion 74 that protrudes in a conical shape. A plate-shaped bulging portion 75 having a rectangular shape in plan view and a rhombus shape in side view is provided above the pressure contact portion 74. Above the bulging portion 75, a passive flange portion 76 protruding outward in the radial direction is provided. A guide piece 77 that restricts the switching valve body 70 to be non-rotatable in the actuator connecting portion 61 by being engaged with the guide groove 68 of the actuator connecting portion 61 protrudes from the outer peripheral portion of the passive flange portion 76. It is installed.

  In the valve packing 78, a reinforcing rib portion 80 is formed on a part of the soft seal portion 79 pressed against the pressure contact portion 60 of the vacuum valve connection portion 55 in order to form a highly rigid portion having higher rigidity than other portions. Is provided. The reinforcing rib portion 80 is provided so as to incline and extend from the cylindrical base portion to the outer peripheral edge of the seal portion 79 when viewed from the moving direction of the switching valve body 70. That is, the seal portion 79 of this embodiment is formed so that the thickness is not uniform. And when separating from the to-be-contacted part 60, it is set apart from the highly rigid part which consists of the reinforcement rib part 80, and it is set as the structure which suppresses the tear of the thin seal part 79. FIG.

  The guide member 81 has a cylindrical shape whose upper end is positioned at the lower end of the stopper portion 73 of the valve rod 71 and whose lower end is positioned at the upper end of the valve packing 78.

  The seal member 82 is pressed against the press contact step 62 from above, and is attached to the valve rod 71 so as to be movable along the axial direction. This seal member 82 switches the actuator connecting portion 61 and the second variable pressure chamber 58 that are opened to the atmosphere by the insertion groove 67 to the open state in which they are communicated and the closed state in which the communication is blocked by the movement of the switching valve body 70. It is. The seal member 82 includes a through hole 83 having a diameter larger than the diameter of the mounting portion of the valve rod 71. The through hole 83 is closed by the pressure contact portion 74 when the switching valve body 70 is moved to the open position. Thereby, the communication between the second variable pressure chamber 58 of the vacuum valve connecting portion 55 and the inside of the actuator connecting portion 61 is blocked. Further, the through hole 83 is opened by the separation of the pressure contact portion 74 when the switching valve body 70 is moved to the closed position. As a result, the second variable pressure chamber 58 of the vacuum valve connecting portion 55 is opened to the atmosphere communicating with the inside of the actuator connecting portion 61.

  The reinforcing members 84A and 84B are disposed above and below the seal member 82. These reinforcing members 84 </ b> A and 84 </ b> B form an annular shape having a through hole larger than the through hole 83. The upper reinforcing member 84 </ b> A has its upper surface locked by the locking portion 89 of the toggle member 85, thereby disposing the seal member 82 in the pressure contact stepped portion 62 so as not to move.

  The holding mechanism includes a resin toggle member 85 disposed so as to be fitted on the toggle member disposition portion 64 of the actuator connecting portion 61. As shown in FIGS. 7A and 7C, the toggle member 85 includes a base plate portion 86 that is curved so as to form an arc shape in plan view and is disposed on the outer surface of the actuator connecting portion 61. The base plate portion 86 is provided with a locking hole 87 through which the locking piece 66 of the actuator connecting portion 61 is passed and locked.

  The toggle member 85 is provided with a pair of elastic holding portions 88, 88 that fit into the elastic holding portion insertion groove 65 of the actuator connecting portion 61 and project into the internal space of the actuator connecting portion 61. The elastic holding portion 88 holds the switching valve body 70 in the open position or the closed position by making line contact with the inclined surface of the bulging portion 75 of the switching valve body 70 located in the actuator connecting portion 61. . Further, the toggle member 85 is provided with a pair of locking portions 89 and 89 which are inserted into the insertion holes 63 and 63 of the actuator connecting portion 61 at the lower end of the base plate portion 86 and position the upper end of the seal member 82. .

  As shown in FIG. 1, the first actuator 90 closes the switching valve body 70 against the holding force of the toggle member 85 when the sewage is stored up to the first water level HWL set in advance in the water tank 1. To the open position. The first actuator 90 includes a float 91 that moves up and down according to the water level in the reservoir 1, and an opening operation member 93 that moves along the linear movement direction of the switching valve body 70 in conjunction with the raising and lowering of the float 91. It has.

  The buoyancy Fb of the float 91 is larger than the holding force Fs of the toggle member 85 (Fs <Fb). The float 91 is integrally provided with a connecting rod 92 for connecting to the opening operation member 93. The connecting rod 92 is set to a total length that allows the switching valve body 70 to be opened via the opening actuating member 93 in a state in which sewage has accumulated up to a first water level HWL set in the water reservoir 1 in advance. The distance obtained by adding the stroke S1 required for opening the switching valve body 70 and the depth S2 at which the float 91 is immersed in sewage is determined by the first water level HWL and the second water level that open and close the switching valve body 70. It is set smaller than the distance between LWLs. Thereby, in the state in which the sewage of the reservoir 1 has fallen to the 2nd water level LWL, the float 91 is located above the water surface of a sewage, and is comprised so that it may not land.

  As shown in FIGS. 6A and 6B, the opening actuating member 93 is connected to the upper end of the connecting rod 92 and extends along the axial direction of the casing 52, which is the linear movement direction of the switching valve body 70. Further, the holder 54 connected to the fixing arm 53 is mounted so as to be movable and non-detachable. The opening actuating member 93 is provided with an actuating portion 94 that is inserted through the insertion groove 67 of the casing 52 and protrudes into the actuator connecting portion 61 and is located below the passive flange portion 76 of the switching valve body 70.

  When the sewage in the water storage tank 1 is drained from the lower end of the water suction pipe 8 to the second water level LWL that is sucked together with air, the second actuator 95 resists the holding force of the toggle member 85 against the holding force of the toggle member 85. Thus, it is moved from the open position to the closed position. As shown in FIGS. 6A, 6B, and 9, the second actuator 95 includes a switching valve body 96 that is divided into a first pressure receiving chamber 123 and a second pressure receiving chamber 124. A closing operation member 129 for closing 70 is disposed. The switching cylinder 96 includes a second lower case 97, a second upper case 101, a second diaphragm 122, a second piston cup 125, and a second urging spring 128. The second actuator 95 is further provided with an adjustment mechanism 110 for adjusting the urging force by the second urging spring 128.

  The second lower case 97 is made of a substantially disk-shaped plate that covers the upper end of the bracket portion 69 of the actuator connecting portion 61. The second lower case 97 is provided with a bracket portion 98 having a connection hole for assembling the second upper case 101 in a sealed state. Of the connection holes of the bracket portion 98, the pair of connection holes facing in the radial direction coincides with the connection holes of the bracket portion 69 of the actuator connection portion 61. In addition, a hole through which the closing operation member 129 is inserted is provided at the center of the second lower case 97, and a second insertion member 99 is disposed above the hole. Further, the second lower case 97 is connected to a second pressure chamber that protrudes so as to be substantially L-shaped so as to be located outside the bracket portion 69 having an oval shape in plan view of the actuator connecting portion 61. Part 100 is provided.

  The second upper case 101 is made of a cylindrical member having a lower end opening that covers the upper side of the second lower case 97. A bracket portion 102 having a connection hole for connection is provided at the lower end edge of the second upper case 101. An adjustment mechanism mounting portion 103 is provided at the center of the upper closing portion of the second upper case 101. The adjustment mechanism attachment portion 103 includes a slide member attachment portion 104 that protrudes downward (inward) so as to form a cylindrical shape from a hole provided in the upper closing portion of the second upper case 101. The slide member mounting portion 104 is provided with guide grooves 105 at a predetermined interval in the circumferential direction. The lower end of the slide member mounting portion 104 also serves as a stopper that stops the upward movement of the second piston cup 125. The adjustment mechanism attachment portion 103 includes a fastening member attachment portion 106 that protrudes upward so as to form a cylindrical shape from the hole of the second upper case 101. The tightening member attaching portion 106 is provided with a seal step portion 107 on the inner peripheral surface. Further, a locking projection 108 for preventing the fastening member 117 from being detached is provided at the upper end of the fastening member attaching portion 106. Further, the upper closing portion of the second upper case 101 is provided with a first pressure detection chamber connecting portion 109 that protrudes so as to form a substantially L shape so as to be positioned on the outer peripheral portion of the adjustment mechanism mounting portion 103. Yes.

  The adjustment mechanism 110 includes a slide member 111 that is movably disposed in the second upper case 101, and a tightening member 117 that is rotatably mounted so as to be exposed to the outside of the second upper case 101. Yes.

  The slide member 111 includes a large-diameter cylindrical portion 112 positioned on the outer side of the slide member mounting portion 104 and a small-diameter cylindrical portion 113 positioned on the inner side of the slide member mounting portion 104, which are equally spaced from the guide groove 105. It is integrally formed by the connecting plate part 114 provided in the above. When the connecting plate portion 114 is inserted into the guide groove 105 of the slide member mounting portion 104, the slide member 111 is prevented from rotating in the circumferential direction around the axis and stopped from moving upward excessively. The A positioning flange 115 for positioning the upper end of the second urging spring 128 is provided at the upper end of the large-diameter cylindrical portion 112 so as to protrude outward in the radial direction. On the inner surface of the small diameter cylindrical portion 113, a thread groove portion 116 is provided so as to form a spiral shape.

  The tightening member 117 has a bottomed cylindrical shape that is inserted from the outside to the inside of the tightening member mounting portion 106. A screw portion 118 that is screwed into the screw groove portion 116 is provided on the outer peripheral portion of the tightening member 117 so as to extend upward from the lower end. A seal flange portion 119 is provided on the upper portion of the screw portion 118. The seal flange portion 119 is in contact with the seal step portion 107 of the tightening member attaching portion 106, thereby preventing air from entering and preventing the tightening member 117 from moving in the axial direction. Further, a pair of operation portions 120 are provided at the upper end of the fastening member 117 so as to face each other in the radial direction. The operation portion 120 is provided with a substantially U-shaped groove, thereby providing an elastic piece 121 therein, and a locking claw portion (not shown) for locking to the locking projection 108 on the outer surface thereof. It has been.

  The second diaphragm 122 divides the inside of the switching cylinder 96 into a first pressure receiving chamber 123 located on the second upper case 101 side and a second pressure receiving chamber 124 located on the second lower case 97 side. Made of a flexible material. The second diaphragm 122 is integrally assembled with the outer peripheral portion sandwiched between the second lower case 97 and the second upper case 101. The first pressure receiving chamber 123 is communicated with the first pressure sensing chamber 20, and the second pressure receiving chamber 124 is communicated with the second pressure sensing chamber 24 whose degree of vacuum is lower than that of the first pressure receiving chamber 123.

  The second piston cup 125 has a tray shape with an upper end opening whose inner diameter is larger than the outer diameter of the slide member 111. The second piston cup 125 is fixedly disposed on the second diaphragm 122 so as to be positioned in the first pressure receiving chamber 123 of the switching cylinder 96. The second piston cup 125 is mounted by sandwiching the second diaphragm 122 with the second sandwiching member 126 by disposing a plate-shaped second sandwiching member 126 on the second pressure receiving chamber 124 side. ing. Reference numeral 127 in the drawing is a ventilation groove for preventing the second piston cup 125 from being partitioned.

  The second urging spring 128 is disposed between the slide member 111 and the second piston cup 125. The second urging spring 128 urges the switching valve body 70 toward the closed position via the second piston cup 125 and the closing operation member 129. The second biasing spring 128 employs a biasing force that contracts via the second piston cup 125 when the degree of vacuum in the first and second pressure receiving chambers 123 and 124 becomes the differential pressure ΔP. . That is, an upward suction force (P 1) acts in the first pressure receiving chamber 123 due to the connection with the first pressure detecting chamber 20, and the second pressure receiving chamber 124 faces downward due to the connection with the second pressure detecting chamber 24. (P1> P2). Thus, an upward pressing force (F1) corresponding to the differential pressure ΔP between the first and second pressure receiving chambers 123 and 124 is generated in the second piston cup 125 positioned between them. Therefore, the second biasing spring 128 is contracted when the pressing force (F1) of the second piston cup 125 generated by the differential pressure ΔP exceeds the spring biasing force (F2) (F1> F2). On the other hand, when the pressing force (F1) of the second piston cup 125 due to the differential pressure ΔP becomes equal to or less than the spring biasing force (F2) (F1 ≦ F2), the expanded state is achieved.

  The urging force of the second urging spring 128, that is, the force Fc that moves the switching valve body 70 to the closed position is set to be larger than the buoyancy Fb of the float 91 (Fs <Fb <Fc). As a result, when the opening operation by the first actuator 90 and the closing operation by the second actuator 95 are simultaneously performed on the switching valve body 70, the closing operation by the second actuator 95 is executed. ing. As a result, the occurrence of chattering in which the vacuum valve 10 is repeatedly opened and closed can be prevented. The second urging spring 128 of the present embodiment is set to an urging force that expands when the differential pressure ΔP between the first and second pressure receiving chambers 123 and 124 reaches about 5 kPa.

  The closing operation member 129 is composed of a rod connected through the second pinching member 126 and the center of the bottom of the second piston cup 125. The closing operation member 129 passes through the second insertion member 99 of the second lower case 97 and extends along the axis of the actuator connecting portion 61, thereby matching the valve rod 71 of the switching valve body 70, The switching valve body 70 moves linearly along the linear movement direction. The closing operation member 129 is set to a total length that can be lowered until the bulging portion 75 is positioned below the elastic holding portion 88 of the toggle member 85 in a state where the second piston cup 125 has advanced to the limit position shown in FIG. 10E. ing. The closing operation member 129 of the second actuator 95 may be integrally provided in a state where it is connected to the second piston cup 125.

  When this vacuum valve device is applied to a vacuum sewer system, the tube body 11 of the vacuum valve 10 is connected to the vacuum water supply pipe 5 located in the water storage tank 1 with the gate valve 7 closed. Further, the controller 50 is fixed in the water reservoir 1 through the holder 54. At this time, the switching valve body 70 is opened at the first water level HWL, and the connecting rod 92 is adjusted so that the float 91 is separated from the water surface at the second water level LWL.

  And the vacuum water supply pipe | tube connection part 57 of the controller 50 and the vacuum water supply pipe | tube 5 located in the downstream of the 1st pressure detection chamber 20 are connected by the air tube 130A which is connection piping. Further, the pressure chamber connecting portion 59 of the controller 50 and the second variable pressure chamber connecting portion 33 of the vacuum valve 10 are connected by the air tube 130B. Further, the first pressure detection chamber connecting portion 109 of the controller 50 and the first pressure receiving chamber connecting portion 21 of the vacuum valve 10 are connected by an air tube 130C. And the 2nd pressure detection chamber connection part 100 of the controller 50 and the 2nd pressure receiving chamber connection part 25 of the vacuum valve 10 are connected by air tube 130D.

  Next, operation | movement of the vacuum-type sewer system to which the vacuum valve apparatus of this invention is applied is demonstrated with reference to FIG. 10A-FIG. 10F. In these drawings, in the drainage path from the lower end of the water absorption pipe 8 to the vacuum water supply pipe 5, the level of the degree of vacuum is represented by light and dark shades, and is represented by a graph on the upper right side.

  As shown in FIG. 10A, in a state where the sewage inside the water storage tank 1 is accumulated only up to the vicinity of the lower side of the water absorption pipe 8, the switching valve body 70 of the controller 50 is moved to the closed position. It is held by the holding force of the elastic holding portion 88 of the member 85.

  In this state, the first pressure detection chamber 20 of the vacuum valve 10 is in a high vacuum level (a set vacuum level Ps or higher), which is the suction force of the vacuum water supply pipe 5, and The water absorption part 12 to include makes an atmospheric pressure state. Therefore, the controller 50 makes the 1st variable pressure chamber 56 of the switching valve mechanism 51 the state more than the setting vacuum degree Ps. In the second actuator 95, the first pressure receiving chamber 123 is in a high vacuum level (Ps), and the second pressure receiving chamber 124 is in the atmospheric pressure state. As a result, the pressing force due to the differential pressure ΔP between the first and second pressure receiving chambers 123 and 124 is stronger than the biasing force of the second biasing spring 128, and the closing operation member 129 is retracted via the second piston cup 125. Operates. In the switching valve mechanism 51 of the controller 50, the switching valve body 70 is maintained in the closed position, and the second variable pressure chamber 58 is opened to the atmosphere through the through hole 83 and the insertion groove 67. For this reason, the pressure chamber 37 of the vacuum valve 10 communicating with the second variable pressure chamber 58 is also in the open state. As a result, the urging force of the first urging spring 40 exceeds the pressing force due to the differential pressure between the reference pressure chamber 36 and the pressure chamber 37, and the vacuum valve 10 maintains the closed state due to the balance of force.

  When sewage accumulates in the reservoir 1 and the float 91 is landed and rises to the first water level HWL, the opening operation member 93 is moved upward as shown in FIG. 10B. As a result, the switching valve body 70 moves upward to the open position against the holding force of the elastic holding portion 88 of the toggle member 85, and this open position is held by the holding force of the elastic holding portion 88 of the toggle member 85. . Thereby, the first variable pressure chamber 56 and the second variable pressure chamber 58 of the controller 50 communicate with each other, and the pressure contact portion 74 of the switching valve body 70 closes the through hole 83 of the seal member 82.

  In this state, the second variable pressure chamber 58 of the controller 50 is shut off from the atmosphere, and becomes the set vacuum level Ps or higher. Therefore, the pressure chamber 37 of the vacuum valve 10 communicating with the second variable pressure chamber 58 also has a high vacuum level that is equal to or higher than the set vacuum level Ps. Further, the second actuator 95 of the controller 50 maintains the non-operating state due to the balance of force because the first pressure receiving chamber 123 maintains the high vacuum degree Ps and the second pressure receiving chamber 124 maintains the atmospheric pressure state. To do.

  When the pressure chamber 37 of the vacuum valve 10 becomes equal to or higher than the set vacuum degree Ps, as shown in FIG. 10C, the water stop valve drive actuator 27 is opened by force balance, and the water absorption part 12 and the discharge part 14 of the tubular body 11 are opened. It becomes the valve opening state which made it communicate. Therefore, the sewage in the reservoir 1 is drained to the vacuum station through the water suction pipe 8, the pipe body 11, the gate valve 7 and the vacuum water supply pipe 5 by the suction action.

  At this time, the degree of vacuum in the drainage path gradually increases from the lower end of the water absorption pipe 8. And when it approaches the valve opening 19 of the vacuum valve 10, the opening area through which water can be passed is reduced, so that it rapidly rises. Further, the vacuum degree is substantially balanced when it passes through the valve port 19 of the vacuum valve 10 and reaches the inside of the first pressure detection chamber 20 having a wide opening area through which water can pass. And when it approaches the vacuum water pipe connecting part 16 in which the opening area where water can be passed is narrowed, it rapidly rises again. Furthermore, when it passes through the vacuum water pipe connecting part 16 and reaches the inside of the vacuum water pipe 5, it reaches the vacuum station in a substantially equilibrium state.

  In this drainage state, the water stop valve drive actuator 27 of the vacuum valve 10 has a high degree of vacuum (> Ps) in the pressure chamber 37 that is the same as the degree of vacuum in the vacuum water supply pipe 5, and the reference pressure chamber 36 is at atmospheric pressure. State. The force due to the differential pressure between the pressure chamber 37 and the reference pressure chamber 36 is larger than the urging force of the first urging spring 40. On the other hand, in the second actuator 95 of the controller 50, the first pressure receiving chamber 123 has the same degree of vacuum as the degree of vacuum in the first pressure detection chamber 20 which is lower than the degree of vacuum in the vacuum water supply pipe 5. Further, the second pressure receiving chamber 124 has the same degree of vacuum as the degree of vacuum in the second pressure detecting chamber 24 which is lower than the degree of vacuum in the first pressure detecting chamber 20. In this state, the pressing force due to the differential pressure ΔP is larger than the urging force of the second urging spring 128.

  When the sewage in the storage tank 1 is lowered to the vicinity of the lower end of the water absorption pipe 8 by drainage, air is mixed into the water absorption from the water absorption pipe 8 (separated suction), and the degree of vacuum of the drainage path is substantially equal as shown in FIG. (Same ratio). That is, the degree of vacuum in the pressure chamber 37 of the vacuum valve 10 decreases to the same degree as the degree of vacuum of the vacuum water supply pipe 5 via the first and second variable pressure chambers 56 and 58. Further, in the second actuator 95 of the controller 50, the degree of vacuum in the first pressure receiving chamber 123 decreases to be equal to the degree of vacuum in the first pressure detecting chamber 20, and the degree of vacuum in the second pressure receiving chamber 124 is reduced to the second pressure detecting chamber 24. The degree of vacuum drops to the same level.

  However, in this state, the force due to the differential pressure between the pressure chamber 37 of the water stop valve drive actuator 27 of the vacuum valve 10 and the reference pressure chamber 36 is sufficiently larger than the urging force of the first urging spring 40, so The spring 40 does not extend. On the other hand, in the second actuator 95 of the controller 50, the differential pressure ΔP between the first and second pressure receiving chambers 123 and 124 decreases as the degree of vacuum in the first and second pressure detecting chambers 20 and 24 decreases uniformly. .

  Then, the sewage in the reservoir 1 is drained to the second water level LWL to increase the amount of air mixed, and the pressing force due to the differential pressure ΔP between the first and second pressure receiving chambers 123 and 124 is applied to the second urging spring 128. When the force is equal to or lower than the force, the second actuator 95 is closed as shown in FIG. 10E. Thereby, the switching valve body 70 is moved to the closed position. As a result, the controller 50 is disconnected from the first variable pressure chamber 56 and the second variable pressure chamber 58, and the second variable pressure chamber 58 is opened to the atmosphere through the through hole 83 and the insertion groove 67 of the seal member 82. Therefore, the pressure chamber 37 of the vacuum valve 10 is in an atmospheric pressure state that is lower than the set vacuum degree Ps.

  As a result, as shown in FIG. 10F, the vacuum valve 10 is in a closed state by moving the water stop valve body 26 to the closed position. If it does so, the drainage which passed through the discharge part 14 from the water absorption part 12 of the vacuum valve 10 will be stopped. Further, the valve port 19 is shut off, so that the degree of vacuum in the first pressure detection chamber 20 becomes a high degree of vacuum equal to or higher than the set vacuum degree Ps, and the second pressure detection chamber 24 is in an atmospheric pressure state. As a result, in the second actuator 95, the first pressure receiving chamber 123 has a high degree of vacuum, and the second pressure receiving chamber 124 is in an atmospheric pressure state. Therefore, the pressing force by the differential pressure ΔP between the first and second pressure receiving chambers 123 and 124 exceeds the urging force of the second urging spring 128. Therefore, the closing operation member 129 moves to the retracted position via the second piston cup 125, and the state shown in FIG. 10A is obtained.

  Next, the transition of the differential pressure ΔP of the vacuum valve unit connected to the vacuum water pipe 5 having a different degree of vacuum will be described.

  As shown in FIG. 11, when the vacuum valve 10 is closed, the vacuum valve device connected to the vacuum water supply pipe 5 having a vacuum degree of −70 kPa has a differential pressure between the first and second pressure receiving chambers 123 and 124. ΔP is 70 kPa. Further, in the vacuum valve device connected to the vacuum water supply pipe 5 having a degree of vacuum of −50 kPa, the differential pressure ΔP between the first and second pressure receiving chambers 123 and 124 is 50 kPa. Further, in the vacuum valve device connected to the vacuum water supply pipe 5 having a degree of vacuum of −25 kPa, the differential pressure ΔP between the first and second pressure receiving chambers 123 and 124 is 25 kPa.

  When the vacuum valve 10 is opened by the first actuator 90, the differential pressure ΔP between the first and second pressure receiving chambers 123, 124 decreases to approximately 15 kPa regardless of the degree of vacuum of the vacuum water supply pipe 5. Thereafter, when the sewage falls to the second water level and air begins to enter, the differential pressure ΔP gradually decreases. When the differential pressure ΔP decreases to 5 kPa corresponding to the urging force of the second urging spring 128, the vacuum valve 10 is closed by the second actuator 95. As a result, the differential pressure ΔP increases to 70 kPa, 50 kPa, or 25 kPa, which is the degree of vacuum of the vacuum water pipe 5.

  As described above, the vacuum valve device of the present invention is provided with the first pressure detection chamber 20 having a larger opening area than the vacuum water supply pipe 5 on the downstream side of the valve seat 18 of the vacuum valve 10. The degree of vacuum in the pressure detection chamber 20 can be made lower than the degree of vacuum in the vacuum water supply pipe 5. Moreover, in the present embodiment, the second pressure detection chamber 24 having an opening area larger than the opening area of the valve port 19 is provided on the upstream side of the valve seat 18 of the vacuum valve 10. The second actuator 95 is a difference between the first pressure receiving chamber 123 communicated with the first pressure sensing chamber 20 and the second pressure receiving chamber 124 communicated with the second pressure measuring chamber 24 whose degree of vacuum is lower than that of the first pressure receiving chamber 123. The vacuum valve 10 is switched from the open state to the closed state by the pressure ΔP.

  As a result, the differential pressure ΔP between the first and second pressure receiving chambers 123 and 124 can be reduced. Moreover, this differential pressure ΔP is kept smaller than the differential pressure between the actual vacuum degree of the vacuum water pipe 5 and the atmospheric pressure. Therefore, a common vacuum valve device can be installed regardless of the actual degree of vacuum in the vacuum water pipe 5. Further, since the differential pressure ΔP is small, the urging force of the second urging spring 128 operated by the differential pressure ΔP can also be reduced. Therefore, the setting error due to the second urging spring 128 of the second actuator 95 is also reduced, so that the second actuator 95 can be operated reliably.

  Further, the controller 50 of the present embodiment has a configuration in which the pressure chamber 37 of the vacuum valve 10 is connected only to the second variable pressure chamber 58 of the switching valve mechanism 51. The second variable pressure chamber 58 of the switching valve mechanism 51 communicates with the first variable pressure chamber 56 connected to the vacuum water supply pipe 5 on the downstream side of the first pressure detection chamber 20. The first and second variable pressure chambers 56 and 58 are opened to the closed position by opening the switching valve body 70 by the first actuator 90 and closing the second actuator 95. Can be switched. Moreover, the switching valve body 70 is held in the open position or the closed position by the toggle member 85 when the actuators 90 and 95 are not operated. Therefore, in the open state of the vacuum valve 10 in which the switching valve body 70 is moved to the open position and the water stop valve body 26 is moved to the open position, the pressure of the vacuum valve 10 is controlled by the configuration other than the switching valve mechanism 51. The degree of vacuum in the chamber 37 does not become lower than the set degree of vacuum Ps that is closed.

  The switching valve mechanism 51 is provided with a seal member 82 having a through hole 83 communicating with the atmosphere in the second variable pressure chamber 58 of the casing 52, and the through hole 83 of the seal member 82 is connected to the switching valve body 70. Therefore, when the switching valve body 70 is moved to the closed position by the second actuator 95, the atmosphere can be introduced into the pressure chamber 37 of the vacuum valve 10 via the second variable pressure chamber 58. Therefore, the vacuum valve 10 can be reliably closed.

  Further, the second actuator 95 of the present embodiment is configured such that the urging force of the second urging spring 128 can be adjusted by the tightening member 117 of the adjusting mechanism 110. Therefore, it is possible to finely adjust the set value of the differential pressure ΔP that operates the closing operation member 129. As a result, the amount of suction air can be adjusted according to the environment (scum amount) at the installation location of the vacuum valve unit. And in a vacuum valve unit with a lot of scum, by increasing the amount of suction air, it is possible to reliably prevent a drainage trouble due to the residual scum being cured. Further, in a vacuum valve unit with a small scum, an energy saving operation can be realized by reducing the amount of suction air, and a decrease in the degree of vacuum of other vacuum valve units can be suppressed.

  The first actuator 90 using the float 91 performs only the opening operation of the switching valve body 70. Therefore, it is not necessary to detect the water level of the reservoir 1 after opening the switching valve body 70. That is, the float 91 only needs to be able to detect only a very small range for detecting the first water level HWL in a situation where sewage is accumulated in the reservoir 1. Therefore, when the amount of sewage in the reservoir 1 is small, the float 91 can be in a state above the surface of the sewage, that is, in the air and not in contact with the sewage. Thereby, it can prevent that the scum which floats on the water surface of sewage adheres to the float 91. FIG. For this reason, it is possible to prevent malfunction caused by the vertical movement of the float 91 being prevented.

  FIG. 12A shows the controller 50 of the vacuum valve device of the second embodiment. The controller 50 is provided with an atmosphere communication portion 131 communicating with the atmosphere in the second pressure receiving chamber 124 of the second actuator 95, and an intake member 133 capable of adjusting the intake amount of the atmosphere is disposed at the opening of the atmosphere communication portion 131. It is set.

  Specifically, as shown in FIG. 12B, the second lower case 97 constituting the second actuator 95 communicates with the second pressure receiving chamber 124 so as to be located outside the bracket portion 69. A cylindrical atmospheric communication portion 131 is provided. A cylindrical intake member mounting portion 132 is provided beside the atmospheric communication portion 131.

  The intake member 133 has a disk shape, and a mounting portion 134 that is rotatably mounted on the intake member mounting portion 132 is provided at the center thereof. A fitting portion 135 that fits to the inner peripheral portion of the lower end of the atmosphere communicating portion 131 is provided on the outer peripheral portion of the mounting portion 134. In the present embodiment, eight fitting portions 135 are provided, and seven fitting portions 135 excluding one fitting portion 135 are provided with intake holes 136a to 136g having different diameters. Specifically, the inner diameter is configured to gradually decrease in the order of the intake holes 136a to 136g. And the fitting part 135 located between the fitting parts 135 and 135 provided with the intake hole 136a and the intake hole 136g is configured such that no intake hole is provided (intake amount “0”).

  The controller 50 of the second embodiment can reduce the degree of vacuum by taking in a small amount of air into the second pressure receiving chamber 124. That is, the differential pressure ΔP between the first and second pressure detection chambers 20 and 24 can be increased. Therefore, the setting for operating the second urging spring 128 can be adjusted. Therefore, the closing operation of the vacuum valve 10 by the second actuator 95 can be reliably set to the target value.

  In addition, the vacuum valve apparatus of this invention is not limited to the structure of the said embodiment, A various change is possible.

  For example, in the above-described embodiment, the controller 50 is configured to open and close the single switching valve body 70 by the first and second actuators 90 and 95. However, the controller 50 switches to the first and second actuators 90 and 95, respectively. A switching mechanism having a valve body may be provided.

  Moreover, in the said embodiment, although the 1st and 2nd pressure detection chambers 20 and 24 were formed in the pipe body 11 which comprises the vacuum valve 10, the opening area which can permeate | transmit the vacuum water supply pipe 5 from the downstream is large. The first pressure detection chamber 20 may be provided, and the second pressure detection chamber 24 having a large opening area through which water can flow from the downstream side may be provided in the water absorption pipe 8. Further, the second pressure detection chamber 24 is not necessarily provided, and the second pressure receiving chamber 124 may be open to the atmosphere.

  Further, in the above-described embodiment, the first pressure detection chamber 20 includes baffle plates 22A. Although B is provided, a configuration may be adopted in which a member through which gas can pass and liquid cannot pass through is provided.

DESCRIPTION OF SYMBOLS 1 ... Reservoir 5 ... Vacuum feed pipe 8 ... Water absorption pipe 10 ... Vacuum valve 18 ... Valve seat 19 ... Valve port 20 ... 1st pressure detection chamber 24 ... 2nd pressure detection chamber 26 ... Water stop valve body 27 ... Water stop Valve drive actuator 35 ... first diaphragm 36 ... reference pressure chamber 37 ... pressure chamber 38 ... first piston cup 40 ... first biasing spring 41 ... opening / closing operation member 50 ... controller 51 ... switching valve mechanism 52 ... casing 56 ... first Transformer chamber 58 ... second transformer chamber 70 ... switching valve body 78 ... valve packing 82 ... seal member 83 ... through hole 85 ... toggle member 90 ... first actuator 91 ... float 93 ... opening actuating member 95 ... second actuator 96 ... Switching cylinder 110 ... Adjusting mechanism 111 ... Sliding member 117 ... Tightening member 122 ... Second diaphragm 123 ... First pressure receiving chamber 124 ... Second pressure receiving chamber 125 ... Second piston Ton cup 128 ... 2nd biasing spring 129 ... Closing operation member 130A-130D ... Air tube 131 ... Atmospheric communication part 133 ... Intake member

Claims (7)

One end is interposed between the other end of the water suction pipe that opens into the water storage tank and the vacuum water supply pipe that is vacuumed, and when the pressure chamber exceeds the set vacuum level, the valve element is opened away from the valve seat and opened. A vacuum valve that is closed when the valve body is seated on the valve seat when the pressure chamber falls below a set vacuum degree;
A first actuator for switching so that the pressure chamber of the vacuum valve is equal to or higher than a set vacuum level when the water level in the water storage tank becomes a preset first water level higher than one end of the water suction pipe;
A second actuator that switches the pressure chamber of the vacuum valve so that it falls below a set vacuum level when the water level in the water reservoir becomes a second water level that sucks liquid together with air from one end of the water suction pipe;
In a vacuum valve device comprising:
A first pressure detection chamber having a larger opening area through which a fluid can pass than an opening area of the vacuum water supply pipe is provided downstream of the valve seat of the vacuum valve; and
The second actuator is partitioned into a first pressure receiving chamber communicated with the first pressure detecting chamber of the vacuum valve and a second pressure receiving chamber having a lower degree of vacuum than the first pressure receiving chamber, and the water level in the reservoir is The vacuum valve device according to claim 1, wherein when the water level reaches two levels, the pressure chamber of the vacuum valve is switched so as to fall below a set vacuum level due to a differential pressure between the first and second pressure receiving chambers.   A second pressure detection chamber having a larger opening area through which fluid can pass than an opening area of a valve opening in the valve seat is provided upstream of the valve seat of the vacuum valve, and the second actuator is provided in the second pressure detection chamber. The vacuum valve device according to claim 1, wherein the second pressure receiving chamber is communicated.   The second pressure receiving chamber of the second actuator is provided with an atmosphere communication portion communicating with the atmosphere, and an intake member capable of adjusting an intake amount of the atmosphere is disposed at an opening of the atmosphere communication portion. Item 3. The vacuum valve device according to Item 2. A casing that forms a first variable pressure chamber communicated with the downstream side of the first pressure detection chamber and a second variable pressure chamber communicated with the pressure chamber of the vacuum valve, and an opening that communicates the first and second variable pressure chambers. A switching valve body disposed in the casing so as to be capable of direct movement between the position and the closed position where communication between the first and second variable pressure chambers is blocked, and the switching valve body in the open position and the closed position in advance. A switching valve mechanism having a holding mechanism for holding with a set holding force;
When the water level in the water reservoir becomes the first water level, the first actuator moves the switching valve body of the switching valve mechanism from the closed position to the open position against the holding force of the holding mechanism, and the water storage When the water level in the basket becomes the second water level, the first actuator moves the switching valve body of the switching valve mechanism from the open position to the closed position against the holding force of the holding mechanism. The vacuum valve device according to any one of claims 1 to 3, wherein the degree of vacuum in the pressure chamber of the vacuum valve is switched by the second actuator. The second variable pressure chamber of the casing of the switching valve mechanism includes a seal member having a through hole communicating with the atmosphere,
The switching valve body closes the through hole of the seal member when moved to the open position to shut off the second variable pressure chamber from the atmosphere, and opens the through hole of the seal member when moved to the closed position. The vacuum valve device according to claim 4, wherein the second variable pressure chamber is communicated with the atmosphere. The second actuator includes:
A switching piston cup disposed in the first pressure receiving chamber;
When the pressing force of the switching piston cup due to the differential pressure in the first and second pressure receiving chambers exceeds the urging force, the contraction occurs. Force spring,
6. The closing operation member for moving the switching valve body from an open position to a closed position by an urging force of the urging spring is connected to the switching piston cup. Vacuum valve device.   The vacuum valve device according to claim 6, wherein the second actuator is provided with an adjustment mechanism that adjusts an urging force of the urging spring.