JP4904253B2 - Vacuum valve control device - Google Patents

Description

  The present invention relates to a vacuum valve control device that temporarily stores drainage from a building and controls the opening and closing of a vacuum valve device used in a vacuum valve unit for limiting the amount of drainage to a vacuum sewage pipe of a vacuum sewer system. Regarding improvement.

  2. Description of the Related Art Conventionally, a vacuum valve control device that controls opening and closing of a vacuum valve device used in a vacuum valve unit of a vacuum sewer system is known (see Patent Document 1, etc.).

  The vacuum sewer system includes a vacuum station, vacuum sewage piping, and a vacuum valve unit.

  The vacuum station is equipped with a vacuum pump device and a water collection tank, and the pressure in the pipe of the vacuum sewage pipe is constantly reduced to a vacuum pressure state (negative pressure state, negative gauge pressure state) by this vacuum pump device. It is in the state that was done.

  For this reason, when the vacuum valve in the vacuum valve unit is opened, it is stored in the vacuum valve unit due to the pressure difference between the vacuum pressure in front of the sewage flow direction and the suction air pressure (atmospheric pressure) in the rear direction of sewage flow. The sewage that has been mixed with air is transported to the vacuum station as a gas-liquid mixed fluid.

  The sewage transported to the vacuum station is finally transported to a sewer main or a sewerage treatment facility.

  The vacuum valve unit temporarily stores sewage discharged from a building or the like, and distributes the stored sewage between the vacuum valve unit and the vacuum station when the amount of stored sewage reaches a certain amount. It has a function of limiting the amount of drainage to the vacuum sewage pipe by discharging it to the provided vacuum sewage pipe.

  In the vacuum valve control device of Patent Document 1 proposed by the applicant himself, the vacuum valve unit is provided with a vacuum discharge pipe whose inside is in a vacuum pressure state, a sewage storage tank, and a vacuum valve device. However, the suction pipe which sucks in the sewage stored in this sewage storage tank and the vacuum discharge pipe are connected.

  The vacuum valve unit is provided with a water level detection pipe that changes the internal air pressure corresponding to the water level in the sewage storage tank, and the vacuum valve control device includes a water level detection air communicated with the water level detection pipe. A connection port, an air source connection port communicating with an atmospheric pressure air source provided on the ground, a vacuum pressure connection port communicating with a vacuum exhaust pipe as a vacuum source, and a cylinder of the vacuum valve body A valve body drive communication port is provided.

  When the air pressure in the water level detection air source connection port is larger than the atmospheric pressure, the vacuum valve control device opens the valve body to connect the valve body drive communication port to the vacuum pressure connection port, When the vacuum valve body is opened by sucking air in the cylinder and the air pressure in the water level detection air source connection port is below atmospheric pressure, the valve body is connected to the communication port for driving the valve body. Is connected to the air source connection port, and a pneumatic circuit is formed for introducing air into the cylinder and returning the vacuum valve body to the closed state.

In the vacuum valve control device, the air source communication passage for returning the closed state of the vacuum valve main body and the air source communication passage for driving the pneumatic circuit are communicated with the atmospheric pressure air source through a common passage.
Japanese Patent No. 2740110

  However, in the vacuum valve control device of Patent Document 1, the air source communication path for returning the closed state of the vacuum valve body and the air source communication path for driving the pneumatic circuit are communicated with the atmospheric pressure air source through a common path. Therefore, when the vacuum valve body is in an intermediate state between the open state and the closed state during the return from the open state to the closed state, the valve body portion Since air is sucked into the air source communication path for returning to the closed state, there is a possibility that the so-called chattering phenomenon that the valve main body repeats the closed state and the open state in small increments due to this air suction. .

  The present invention is configured in view of the above problems, and provides a vacuum valve control device that realizes a stable open / close state without chattering when the valve body returns from the open state to the closed state. The purpose is to do.

In order to achieve the above object, the invention described in claim 1 is a vacuum valve unit for temporarily storing drainage from a building and limiting the amount of drainage to a vacuum sewage pipe of a vacuum sewer system. A vacuum exhaust pipe in a vacuum pressure state, a sewage storage tank, and a vacuum valve device are provided, and the vacuum valve apparatus that connects the suction pipe and the vacuum discharge pipe for sucking sewage stored in the sewage storage tank A vacuum valve control device for controlling the opening and closing of the vacuum valve body,
A water level detection air connection port provided in the vacuum valve unit and communicated with a water level detection pipe that changes an internal air pressure corresponding to a water level in the sewage storage tank;
An air source connection port communicated with an atmospheric pressure air source into which the atmosphere is introduced;
A vacuum pressure connection port communicating with a vacuum source provided in the vacuum exhaust pipe;
A valve body drive communication port communicated with the upper space in the cylinder of the vacuum valve body,
Is provided,
If the air pressure in the water level detection air connection port is greater than atmospheric pressure, opening the valve body allows the valve body drive communication port to communicate with the vacuum pressure connection port, and sucks air in the upper space inside the cylinder. And open the vacuum valve body,
When the air pressure in the water level detection air connection port is less than atmospheric pressure, the valve body is closed to connect the valve body drive communication port to the air source connection port, and the air in the upper space in the cylinder A pneumatic circuit is formed, in which the vacuum valve body is closed by introducing
When the valve body of the pneumatic circuit is in an intermediate state between the open state and the closed state while returning from the open state to the closed state, the vacuum valve main body is It is characterized by a vacuum valve control device provided with a suction prevention mechanism for preventing air suction into the air source communication path for returning to the closed state.

In the invention described in claim 2, a partition is provided between the air source communication path for returning the closed state of the vacuum valve body and the air source communication path for driving the pneumatic circuit,
The suction prevention mechanism is configured such that an air source communication path for returning the closed state of the vacuum valve body and an air source communication path for driving the pneumatic circuit are connected to the atmospheric pressure air source through separate communication paths, respectively. The vacuum valve control device according to claim 1 is configured.

  According to a third aspect of the present invention, the suction prevention mechanism prevents passage of air from the air source communication path for driving the pneumatic circuit to the air source communication path for returning the vacuum valve body to the closed state. The vacuum valve control device according to claim 1, which is constituted by a check valve for blocking.

  According to the first aspect of the present invention configured as described above, the valve element of the pneumatic circuit is in an intermediate state between the open state and the closed state in the middle of returning from the open state to the closed state. Since a suction prevention mechanism is provided to prevent air suction from the air source communication passage for driving the pneumatic circuit to the air source communication passage for returning the closed state of the vacuum valve main body to the vacuum valve main body. Air intake from the air source communication passage for driving the pneumatic circuit, which causes chattering when the valve is closed, to the air source communication passage for returning the vacuum valve body to the closed state is prevented, and the vacuum valve body is closed. Occasionally, chattering does not occur and stable closing is possible, and the vacuum sewer system can be used without reducing the sewage transfer capability of the vacuum sewer system.

  According to a second aspect of the present invention, a partition is provided between the air source communication path for returning the closed state of the vacuum valve body and the air source communication path for driving the pneumatic circuit, and the vacuum valve body is closed. Since the air source communication path for returning to the normal state and the air source communication path for driving the pneumatic circuit are respectively connected to the atmospheric pressure air source by separate communication paths, the suction prevention mechanism according to claim 1 is configured. Air intake from the air source communication path for driving the pneumatic circuit, which causes chattering when the vacuum valve body is closed, to the air source communication path for returning the vacuum valve body to the closed state is prevented, and the vacuum valve body A chattering phenomenon does not occur at the time of closing, and stable closing becomes possible, and the vacuum sewer system can be used without reducing the sewage transfer capability of the vacuum sewer system.

  According to a third aspect of the present invention, the suction prevention mechanism according to the first aspect allows air to pass from the air source communication path for driving the pneumatic circuit to the air source communication path for returning the vacuum valve body to the closed state. Since the check valve is configured to prevent the chattering phenomenon that occurs when the vacuum valve body is closed, the air source circuit for returning the closed state of the vacuum valve body from the air source communication path for driving the pneumatic circuit, which causes chattering. Air intake into the passage is prevented, chattering does not occur when the vacuum valve body is closed, and stable closing is possible, and the vacuum sewer system is used without reducing the sewage transfer capacity of the vacuum sewer system can do.

  In addition, as in claim 2, the air source communication path for returning the closed state of the vacuum valve body and the air source communication path for driving the pneumatic circuit communicate with the atmospheric pressure air source without using separate communication paths. Since no input path is required, chattering can be prevented at a low cost.

  First, before explaining the controller as the vacuum valve control device of the present invention, the controller according to the prior art (Patent Document 1, Japanese Patent No. 2740110) of the present invention proposed by the applicant himself, the vacuum valve device using the controller The vacuum valve unit will be described with reference to FIGS.

<Configuration of vacuum sewer system>
The vacuum sewer system includes a vacuum station, vacuum sewage piping, and a vacuum valve unit.

  The vacuum station is equipped with a vacuum pump device and a water collection tank, and the pressure in the pipe of the vacuum sewage pipe is constantly reduced to a vacuum pressure state (negative pressure state, negative gauge pressure state) by this vacuum pump device. It is in the state that was done.

  For this reason, when the vacuum valve in the vacuum valve unit is opened, it is stored in the vacuum valve unit due to the pressure difference between the vacuum pressure in front of the sewage flow direction and the suction air pressure (atmospheric pressure) in the rear direction of sewage flow. The sewage that has been mixed with air is transported to the vacuum station as a gas-liquid mixed fluid.

  The sewage transported to the vacuum station is finally transported to a sewer main or a sewerage treatment facility.

  The vacuum valve unit temporarily stores sewage discharged from a building or the like, and distributes the stored sewage between the vacuum valve unit and the vacuum station when the amount of stored sewage reaches a certain amount. It has a function of limiting the amount of drainage to the vacuum sewage pipe by discharging it to the provided vacuum sewage pipe.

<Configuration of vacuum valve unit>
FIG. 1 is a schematic cross-sectional view of a vacuum valve unit using a vacuum valve device common to the invention of Patent Document 1 and the present invention.

  In FIG. 1, reference numeral 1 is a unit body of a vacuum valve unit buried underground, reference numeral 2 is a sewage inflow pipe drawn into the unit body 1, and reference numeral 3 is provided at the bottom of the unit body 1, In addition, it is sewage water for temporarily storing sewage flowing from the sewage inflow pipe 2.

  The unit main body 1 according to the invention of Patent Document 1 and the present invention is mainly formed of a resin, and includes a disk-shaped bottom plate portion 1a, a substantially cylindrical side wall portion 1b, and a cast lid portion 1c. Have.

  One end of the outside air introduction pipe 4 is drawn into the unit body 1 through the side wall 1b, and the other end of the outside air introduction pipe 4 is the lower end of the air intake pipe 4a erected from the ground. Since the outside air can be introduced into the inside of the unit body 1 by being connected to the unit, the inside of the unit body 1 is always kept substantially equal to the outside air pressure.

  Further, one end of the outside air introduction thin tube 5 is drawn into the unit main body 1 through the side wall 1b, and the other end of the outside air introduction thin tube 5 is erected from the ground. A branch connector C is attached to the end of the outside air introduction thin tube 5 on the unit main body 1 side, connected to the lower end of 5a.

  For this reason, external air can be introduced by connecting a tube or the like to the branch connector C.

  And in the inside of the unit main body 1, the suction pipe 6 for sucking the dirty water stored in the dirty water 3 is standingly arranged so that the lower end part may be immersed in the dirty water.

  Further, a water level detection pipe 11 for detecting the water level in the sewage basin 3 is erected in the unit main body 1 so that the lower end of the sewage is immersed in the sewage.

  An end portion 7Aa of the connecting portion 7A of the vacuum valve body 7 is connected horizontally to the upper end portion of the suction pipe 6 via an L-shaped tube, and an end portion 7Ab of the connecting portion 7A is connected to the end portion 7Ab via a partition valve 8. The sewage drain pipe 9 is connected horizontally.

  The gate valve 8 is used for partitioning the communication between the vacuum valve body 7 and the sewage drain pipe 9 during maintenance work or the like.

  Since the sewage drain pipe 9 is connected to the vacuum sewage pipe, the inside of the sewage drain pipe 9 is always in a vacuum pressure state (negative pressure state).

<Configuration of vacuum valve body>
FIG. 2 is a longitudinal sectional view of a vacuum valve body 7 common to the invention of Patent Document 1 and the present invention.

  In FIG. 2, the code | symbol 7A is the above-mentioned connection part, and the code | symbol 7B is a piston part.

  In the connecting part 7A of the vacuum valve body 7, the valve hole VH1 between the end part 7Aa and the end part 7Ab can be opened and closed by the valve body 10 fitted inside the connecting part 7A, and the valve hole VH1 is opened. In this state, the suction pipe 6 and the sewage drain pipe 9 shown in FIG. 1 are in communication with each other, and the sewage in the sewage drain 3 is sucked by the vacuum pressure in the sewage drain pipe 9 and sucked. It passes through the pipe 6, the connecting portion 7A, and the sewage drain pipe 9 and is discharged.

  As shown in FIG. 1, the water level detection tube 11 and the vacuum valve controller 12 of the vacuum valve device V are connected by a tube T1, and the inside of the water level detection tube 11 and the inside of the vacuum valve controller 12 communicate with each other. Therefore, the air pressure change in the water level detection tube 11 is transmitted into the vacuum valve controller 12 through the tube T1.

  The vacuum valve controller 12 controls the air pressure in the cylinder space CR of the vacuum valve body 7 based on the change in air pressure inside the water level detection tube 11.

  As shown in FIG. 2, the vacuum valve controller 12 and a vacuum source connector VC as a vacuum source provided at the end 7Ab on the vacuum sewage piping side of the connecting portion 7A are connected by a tube T3.

  As shown in FIG. 1, since the vacuum valve controller 12 and the branch connector C are connected by a tube T2, the vacuum valve controller 12 includes a vacuum pressure in the sewage drain pipe 9, an external atmospheric pressure, Is always supplied.

  Furthermore, the atmospheric pressure side connector C2 of the vacuum valve body 7 and the branch connector C are connected by a tube T2, and the cylinder space CR of the vacuum valve body 7 is also in communication with the atmosphere.

  The vacuum valve main body 7 includes a first housing 7A1 having a substantially Y-shape and a second housing 7B1 having a substantially cylindrical shape. The first housing 7A1 is integrally formed with the connecting portion 7A and the inside of the connecting portion 7A. The second housing 7B1 is connected to the upper portion of the first housing 7A1 by a band clamp 13.

  The first housing 7A1 is in an inclined state of approximately 45 degrees with respect to the extending direction of the connecting portion 7A in a horizontal state.

  The inside of the first housing 7A1 is vertically divided by a partition wall W, and the upper side of the partition wall W is a cylinder space CR.

  A valve rod 15 passes through the central portion of the partition wall W, and a valve body 10 that opens and closes the connecting portion 7A is attached to a lower end portion of the valve rod 15.

  The upper end portion of the valve rod 15 penetrating into the cylinder space CR is attached to the bottom surface of the cup-shaped piston body 16 whose upper surface portion is open.

  The piston body 16 is slidably fitted in the cylinder space CR, and is urged in a direction in which the valve body 10 closes the valve hole VH1 of the connecting portion 7A by the push spring 17 disposed in the cylinder space CR. Has been.

  An elastic rolling diaphragm 18 is provided between the first housing 7A1 and the second housing 7B1.

  The outer peripheral edge of the rolling diaphragm 18 is fixed in a state of being sandwiched between the first housing 7A1 and the second housing 7B1, and the rolling diaphragm 18 covers the bottom surface of the piston body 16 and is in close contact therewith. It is fixed to the bottom surface of the piston body 16.

  The rolling diaphragm 18 bends around the circumference of the gap between the piston body 16 and the second housing 7B1, and maintains airtightness between the space CR1 above the cylinder space CR and the space CR2 below the cylinder space CR. ing.

  A valve stem 15 is fixed to the bottom surface of the piston body 16 through the rolling diaphragm 18.

  A vacuum valve controller 12 is fitted inside the upper end of the second housing 7B1, and is connected by a band clamp 19.

  The vacuum valve controller 12 sucks the air in the space CR1 above the cylinder space CR from the suction port M when the amount of water in the sewage water 3 increases and the pressure in the water level detection pipe 11 rises from the atmospheric pressure. Thus, by setting the inside of the space CR <b> 1 to a vacuum pressure state (negative pressure state), the piston body 16 is pushed up against the biasing force of the spring 17, and the valve body 10 connected to the piston body 16 is pulled upward.

  When the valve body 10 is pulled up, the suction pipe 6 and the sewage drain pipe 9 are in communication with each other, and the sewage in the sewage basin 3 has an atmospheric pressure in the unit body 1 and a vacuum pressure acting on the sewage drain pipe 9. It is discharged through the sewage drain pipe 9 by the differential pressure.

<Configuration of controller>
FIG. 3 is a longitudinal sectional view of the vacuum valve controller 12.

  The vacuum valve controller 12 has a casing formed by five first case portions 21 to fifth case portions 25.

  The first case portion 21 to the fifth case portion 25 are arranged in this order from the top, and are integrated by bolts.

  As shown in FIG. 2, the vacuum valve body 7 and the vacuum valve controller 12 are configured such that the outer wall portion of the fourth case portion 24 of the vacuum valve controller 12 is fitted inside the upper end portion of the second housing 7B1 of the vacuum valve body 7. Are coupled by a band clamp 19.

  As shown in FIG. 3, a water level detection connector C1 is provided on the upper side of the first case portion 21 located at the top of the vacuum valve controller 12, and the water level detection connector C1 includes A tube T1 connected to the water level detection tube 11 shown in FIG.

  Further, the atmospheric pressure side connector C2 is integrally formed in the third case portion 23. The atmospheric pressure side connector C2 includes a tube T2, and a branch connector C and an outside air introduction pipe as shown in FIG. 5 is connected to the air intake thin tube 5a. For this reason, the pressure inside the passage P2 of the atmospheric pressure side connector C2 is always almost equal to the atmospheric pressure.

  Furthermore, a vacuum side connector C3 is integrally formed on the third case portion 23, and a vacuum source connector VC shown in FIG. 2 is connected to the vacuum side connector C3 via a tube T3. For this reason, the inside of the passage P3 of the vacuum-side connector C3 is always in a vacuum pressure state (negative pressure state).

  A suction port M is integrally formed in the fifth case portion 25 located at the lowermost part of the vacuum valve controller 12 so as to protrude downward. By fitting the vacuum valve controller 12 into the vacuum valve body 7, The passage P of the suction port M communicates with a space CR1 above the cylinder space CR of the vacuum valve body 7.

  A concave portion for forming a detection pressure adjustment chamber R1 having an opening above is provided on the upper side portion of the first case portion 21, and a water level is detected by sandwiching a disc-shaped damping diaphragm D1 above the concave portion. The detection pressure adjustment chamber R1 is formed by attaching the connector C1.

  A through hole P1 is formed in the water level detection connector C1, and a damping diaphragm D1 is in contact with the lower end of the through hole P1.

  The vibration-damping diaphragm D1 is provided with a small hole D1a having a small diameter, and air can pass through the small hole D1a.

  An air chamber R2 for the water level detection diaphragm D2 is formed between the first case portion 21 and the second case portion 22.

  The air chamber R2 includes an upper air chamber D2u having an opening on the lower surface side of the first case portion 21 and a lower air chamber D2d having an opening on the upper surface side of the second case portion 22. .

  Since the first case portion 21 and the second case portion 22 are joined together with the water level detection diaphragm D2 disposed therebetween, the upper air chamber D2u and the lower air chamber D2d are connected to the water level detection diaphragm D2. Is airtightly isolated.

  A concave portion for forming the first valve chamber RV1 having an upper opening is provided in the upper central portion of the third case portion 23. The second case portion 22 located above the concave portion, the third case portion 23, Are joined together to form a first valve chamber RV1 that accommodates the switch valve SV.

  An air chamber R3 for the valve driving diaphragm D3 is formed between the third case portion 23 and the fourth case portion 24.

  The air chamber R3 is configured by an upper air chamber D3u having an opening on the lower surface side of the third case portion 23 and a lower air chamber D3d having an opening on the upper surface side of the fourth case portion 24. .

  Since the third case portion 23 and the fourth case portion 24 are joined together with the valve driving diaphragm D3 disposed therebetween, the upper air chamber D3u and the lower air chamber D3d are used for valve driving. It is isolated airtightly by the diaphragm D3.

  A concave portion for accommodating a three-way valve TV having an opening in the lower portion is provided in the lower central portion of the fourth case portion 24. A fifth case portion 25 located below the concave portion, and the fourth case portion 24, Are joined together to form a second valve upper air chamber RV2u that accommodates the three-way valve TV.

  Further, a second valve lower air chamber RV2d located below the three-way valve TV is formed at the upper center portion of the fifth case portion 25, and the second valve upper air chamber RV2u and the second valve lower portion are formed. A second valve air chamber RV2 for accommodating a three-way valve TV is formed by the side air chamber RV2d.

  The detection pressure adjustment chamber R1 and the upper air chamber D2u are partitioned by a partition wall portion W1 as a lower component wall of the detection pressure adjustment chamber R1. The partition wall W1 is formed with a through hole H1 for communicating the detection pressure adjustment chamber R1 and the upper air chamber D2u.

  The lower air chamber D2d and the first valve chamber RV1 for installing the switch valve SV are partitioned by a partition wall portion W2 as a lower constituent wall of the lower air chamber D2d. A passage P2a for communicating the lower air chamber D2d and the passage P2 of the atmospheric pressure side connector C2 is formed in the partition wall W2.

  The first valve chamber RV1 and the upper air chamber D3u are partitioned by a partition wall portion W3 as a lower component wall of the first valve chamber RV1. The partition wall W3 is formed with a through hole H2 that communicates the first valve chamber RV1 and the upper air chamber D3u.

  The lower air chamber D3d and the second valve upper air chamber RV2u are partitioned by a partition wall portion W4 as a lower constituent wall of the lower air chamber D3d. A second valve upper hole VH2u that communicates the lower air chamber D3d and the second valve upper air chamber RV2u is formed in the partition wall W4.

  The second valve upper hole VH2u is provided with an upper packing PKu to close the second valve upper hole VH2u when the three-way valve TV is fitted.

  The second valve upper air chamber RV2u and the second valve lower air chamber RV2d are partitioned by a partition wall portion W4 as an upper component wall of the fifth case portion 25. A second valve lower hole VH2d that communicates the second valve upper air chamber RV2u and the second valve lower air chamber RV2d is formed in the partition wall W4.

  The second valve lower hole VH2d is provided with a lower packing PKd for closing the second valve lower hole VH2d when the three-way valve TV is fitted.

  In the third case portion 23, there are a passage P2b communicating with the lower air chamber D2d through the passage P2a in the second case portion 22, and a lower air chamber D3d through the passage P2d in the fourth case portion 24. A passage P2c communicating with the passage P2c is formed, and the passage P2, the passage P2b, and the passage P2c are connected at the connection point BP1.

  Therefore, the lower air chamber D2d for the water level detection diaphragm D2 and the lower air chamber D3d for the valve driving diaphragm D3 communicate with the passage P2, and the tube T2, the branch connector C, the outside air introduction pipe 5, It communicates with the atmosphere through the air intake thin tube 5a.

  Further, in the third case portion 23, a passage P3a communicating with the first valve chamber RV1 through the valve hole VH3 of the switch valve SV, and a second valve lower air chamber RV2d through the passage P3c and the passage P3d. A passage P3b communicating with the passage P3b is formed, and the passage P3a, the passage P3b, and the passage P3 described above are connected at the connection point BP2.

  Accordingly, the first valve chamber RV1 and the second valve lower air chamber RV2d in the opened state of the switch valve SV communicate with the passage P3, and the tube T3, the vacuum source connector VC, and the end portion 7Ab of the connecting portion 7A. The vacuum source is communicated through the gate valve 8 and the sewage drain pipe 9.

  Further, in the third case portion 23, a passage communicating the first valve chamber RV1 and the lower air chamber D2d above the first valve chamber RV1 via the through hole H3 and the needle valve portion NV. PN is formed, and further, a through hole H4 that communicates the needle valve portion NV and the passage P3 is formed.

  Furthermore, since a passage P that connects the cylinder space CR and the second valve upper air chamber RV2u through the suction port M is formed in the fifth case portion 25, the three-way valve TV is opened (upper side). In the second valve upper hole VH2u), the passage P and the passage P3 communicate with each other.

  Therefore, the cylinder space CR of the vacuum valve main body 7 communicates with the vacuum source via the passage P, the passage P3, the tube T3, the vacuum source connector VC, the end portion 7Ab of the connecting portion 7A, the partition valve 8, and the sewage drain pipe 9. It is like that.

  The vacuum valve device V is configured by the vacuum valve body 7 and the vacuum valve controller 12 configured as described above.

  A plunger 26 that passes through the air chamber R2 for the water level detection diaphragm D2 in the vertical direction is attached to the center of the water level detection diaphragm D2.

  The upper end portion of the plunger 26 is fitted in a shaft hole 26a provided in the partition wall portion W1 of the first case portion 21 so as to be slidable in the vertical direction, and the lower end portion of the plunger 26 is fitted to the second case portion 22. Is fitted in a shaft hole 26b provided in the partition wall W2 so as to be slidable in the vertical direction.

  For this reason, since the outer peripheral part of the water level detection diaphragm D2 has flexibility, the plunger 26 can be slid in the vertical direction by elastically deforming this part.

  The lower end portion of the plunger 26 penetrates through the central portion of the partition wall portion W2 and enters the first valve chamber RV1.

  A push spring 27 is provided below the plunger 26, and the plunger 26 and the water level detection diaphragm D <b> 2 are urged upward by the push spring 27.

  The valve hole VH3 at the end of the passage P3a communicating with the vacuum side connector C3 can be opened and closed by a switch valve SV disposed in the first valve chamber RV1.

  As the switch valve SV, a snap action valve having a snap action mechanism is used. When the plunger 26 is lowered, a leaf spring pressed against the plunger 26 and a passage P3a by the urging force of the leaf spring. And a tongue piece provided at the tip of the leaf spring so as to open and close the valve hole VH3.

  When the plunger 26 is lowered and the leaf spring is pressed, the tongue piece jumps upward to open the valve hole VH3 of the passage P3a, and the first valve chamber RV1 and the vacuum side connector C3 are connected to each other. When communication is established via the passage P3a and the passage P3, and the pressure on the leaf spring by the plunger 26 is released, the valve hole VH3 is closed.

  A rod-shaped valve shaft 28 is attached to the lower side of the central portion of the valve driving diaphragm D3. The valve shaft 28 is inserted into the second valve upper hole VH2u, and a three-way valve TV is attached to the lower end portion of the valve shaft 28.

  A push spring 29 is provided above the valve drive diaphragm D3. The push spring 29 urges the valve drive diaphragm D3 and the three-way valve TV downward.

  When the switch valve SV is opened, the air in the upper air chamber D3u is discharged through the through hole H2, the valve hole VH3, the passage P3a, the passage P3, and the vacuum side connector C3, and the valve driving diaphragm D3 rises. Accordingly, the three-way valve TV rises and the three-way valve TV enters an open state (a state where the three-way valve TV is fitted in the upper second valve upper hole VH2u).

  When the switch valve SV is closed, air is introduced through C2, the lower air chamber D2d, the passage PN, the first valve chamber RV1, and the through-hole H2, and the valve driving diaphragm D3 rises. As a result, the three-way valve TV rises and the three-way valve TV enters a closed state (a state where the three-way valve TV is fitted in the lower second valve lower hole VH2d).

  The needle valve portion NV is adapted to adjust the flow rate when the air introduced into the lower air chamber D2d is introduced into the first valve chamber RV1, and by adjusting the needle valve portion NV, Since the introduction time of the air introduced into D3u through the first valve chamber RV1 is adjusted, the return time from the closed state to the open state of the three-way valve TV can be adjusted.

<Operation of vacuum valve device>
The operation of the vacuum valve device V will be described.

  Since the vacuum side connector C3 of the vacuum valve controller 12 is in communication with the sewage drain pipe 9, the inside thereof is in a vacuum pressure state.

  In such a state, when the amount of sewage in the sewage masu 3 gradually increases and the pressure of the air in the water level detection tube 11 whose lower end is immersed in the sewage gradually increases, the water level detection tube 11 The pressure in the water level detection connector C1 of the vacuum valve controller 12 communicating through the tube T1 gradually increases.

  When the pressure in the water level detection connector C1 rises, the pressure in the detection pressure adjustment chamber R1 gradually rises through the small hole D1a of the vibration suppression diaphragm D1.

  When the pressure in the detection pressure adjusting chamber R1 gradually increases, the pressure in the upper air chamber D2u communicating with the communication hole H1 gradually increases.

  When the pressure in the upper air chamber D2u gradually increases, the water level detection diaphragm D2 is displaced while being elastically deformed gradually downward (see FIG. 4).

  Since the lower air chamber D2d communicates with the outside air via the passage P2a, the passage P2b, the atmospheric pressure side connector C2, the tube T2, the outside air introduction pipe 5, and the air intake narrow pipe 5a, the water level detection diaphragm D2 is directed downward. When the elastic deformation is gradually performed, the air in the lower air chamber D2d is discharged to the outside.

  When the water level detection diaphragm D2 is lowered, the plunger 26 is lowered accordingly.

  When the plunger 26 is lowered, the switch valve SV is pressed by the lower end portion of the plunger 26, and the switch valve SV is opened.

  When the switch valve SV is opened, the vacuum connector C3 and the first valve chamber RV1 are in communication with each other, so that the first valve chamber RV1 is in a vacuum pressure state (negative pressure state).

  When the inside of the first valve chamber RV1 is in a vacuum pressure state, the upper air chamber D3u for the valve driving diaphragm D3 is in a vacuum pressure state through the communication hole H2.

  Since the lower air chamber D3d for the valve driving diaphragm D3 is in communication with the outside air via the atmospheric pressure side connector C2, the upper air chamber D3u is decompressed, so that the valve driving diaphragm D3 is Then, it is elastically deformed upward against the push spring 29 (see FIG. 4).

  When the valve driving diaphragm D3 is elastically deformed upward, the valve shaft 28 and the three-way valve TV are raised accordingly, and the second valve lower hole VH2d is opened and the second valve upper hole VH2u is opened. Blocking (open state of the three-way valve TV).

  When the three-way valve TV is opened, the second valve upper air chamber RV2u communicates with the passage P3d through the second valve lower hole VH2d and is in a vacuum pressure state, and therefore communicates with the second valve upper air chamber RV2u. The passage P of the suction port M is in a vacuum pressure state.

  Thereby, the inside of the cylinder space CR of the vacuum valve body 7 communicating with the suction port M is in a vacuum pressure state.

  When the inside of the cylinder space CR of the vacuum valve body 7 is in a vacuum pressure state, the piston body 16 is pulled up against the urging force of the push spring 17, and the valve body 10 joined to the piston body 16 via the valve rod 15. Moves upward (see FIG. 2).

  As a result, the valve hole VH1 of the connecting part 7A is opened, the sewage drain pipe 9 and the suction pipe 6 are in communication with each other via the connecting part 7A, and the suction pipe 6 is caused by the vacuum pressure in the sewage drain pipe 9. The sewage in the sewage 3 is sucked in.

  The sewage in the sewage basin 3 is sucked into the suction pipe 6 and sucked into the sewage drain pipe 9 from the connecting portion 7A, and quickly discharged from the vacuum valve unit 1.

  In this manner, when the sewage in the sewage basin 3 is quickly discharged, the pressure in the water level detection pipe 11 rapidly decreases, and the pressure in the water level detection connector C1 rapidly decreases.

  Since the detection pressure adjusting chamber R1 communicates with the upper air chamber D2u for the water level detection diaphragm D2 through the communication hole H2, the air in the upper air chamber D2u for the water level detection diaphragm D2 is also detected by the detection pressure adjusting chamber R1. The water level is quickly discharged from the water level detection connector C1 and the downward elastic deformation of the water level detection diaphragm D2 is eliminated.

  When the elastic deformation of the water level detection diaphragm D2 is thus eliminated, the plunger 26 attached to the lower surface side of the water level detection diaphragm D2 moves upward.

  Then, the pressure of the switch valve SV by the plunger 26 is released, the valve hole VH3 communicating with the vacuum side connector C3 is closed by the switch valve SV, and the communication between the first valve chamber RV1 and the vacuum side connector C3 is established. Blocked.

  At this time, the inside of the first valve chamber RV1 is in a vacuum pressure state. The vacuum pressure state is such that air flows from the atmospheric pressure side connector C2 to the passage P2b, the passage P2a, the lower air chamber D2d, and the needle valve portion NV. By gradually flowing into the first valve chamber RV1 through the passage PN, the time is eliminated with a slight delay.

  When the vacuum pressure state of the first valve chamber RV1 is eliminated, the vacuum pressure state of the upper air chamber D3u communicating with the first valve chamber RV1 is also eliminated, and the valve drive diaphragm D3 is Since it is biased downward, the upward elastic deformation of the valve drive diaphragm D3 is eliminated.

  As a result, the valve shaft 28 attached to the valve drive diaphragm D3 moves downward, and the three-way valve TV attached to the lower end of the valve opens the upper second valve upper hole VH2u and lowers it. The second valve lower hole VH2d is closed (closed state of the three-way valve TV).

  As a result, the suction port M communicating with the cylinder space CR of the vacuum valve body 7 is connected to the atmospheric pressure side connector C2 via the second valve upper air chamber RV2u, the lower air chamber D3d, the passage P2d, the passage P2c, and the passage P2. The air in the atmospheric pressure side connector C2 is introduced into the suction port M.

  Thereby, the vacuum pressure state in the cylinder space CR in the vacuum valve body 7 is canceled, the piston body 16 of the vacuum valve body 7 moves downward by the urging force of the push spring 17, and the valve body 10 is connected to the connecting portion 7A. The valve hole VH1 is closed.

  Thus, in the controller according to the prior art (Patent Document 1, Patent No. 2740110), when the air pressure in the water level detection connector C1 is equal to or lower than the atmospheric pressure, the suction port M is communicated with the atmospheric pressure side connector C2. Thus, when the air in the upper space CR1 of the cylinder space CR is sucked to open the vacuum valve body 7, and the air pressure in the water level detection connector C1 is larger than the atmospheric pressure, the suction port M is connected to the atmospheric pressure side connector. By communicating with C2, a pneumatic circuit is formed for introducing air into the upper space CR1 of the cylinder space CR and returning the vacuum valve body 7 to the closed state.

<Chattering phenomenon when the vacuum valve body is closed>
Incidentally, as shown in FIG. 3 or FIG. 4, in the controller according to the prior art (Patent Document 1, Patent No. 2740110), the passage P2 of the atmospheric pressure side connector C2 is connected to the passage P2b and the passage P2c at the connection point BP1. Branched.

  As shown in FIG. 5, when the vacuum valve body 7 is in the middle of returning from the open state to the closed state, when the intermediate state between the open state and the closed state is reached, Via side air chamber D3d, second valve upper hole VH2u, second valve upper air chamber RV2u, second valve lower hole VH2d, second valve lower air chamber RV2d, passage P3d, passage P3c, passage P3b, passage P3 Therefore, air is sucked from the passage P2 toward the passage P2c.

  At this time, since the air in the upper air chamber D2u is sucked through the passages P2a and P2b, the plunger of the water level detection diaphragm D2 that has been moved upward to bring the vacuum valve body 7 into a closed state. 26 moves downward, and becomes an open state again, and even if it is going to close the vacuum valve main-body part 7, what is called a chattering phenomenon which repeats a closed state and an open state little by little may arise.

  When the closed state of the vacuum valve main body 7 becomes unstable due to such chattering phenomenon, unnecessary air enters the vacuum sewage piping and the degree of vacuum in the vacuum sewage piping decreases. There was a risk that the sewage transfer capacity of the entire sewer system would be reduced.

  Hereinafter, embodiments according to the present invention will be described based on examples.

<Constitution>
Therefore, as shown in FIG. 6, in the controller of the first embodiment, the partition PW is provided between the passage P2a and the passage P2c, and the three-way valve TV is in the process of returning from the open state to the closed state. In the intermediate state between the open state and the closed state, air suction from the pneumatic circuit driving passages P2A, P2a to the passages P2B, P2c, P2d for returning the closed state of the vacuum valve body 7 is prevented. The
An atmospheric pressure side connector C2A and an atmospheric pressure side connector C2B are formed in the third case portion 23, and the passage P2A of the atmospheric pressure side connector C2A is communicated with the lower air chamber D2d via the passage P2b and the passage P2a. The passage P2B of the atmospheric pressure side connector C2B is communicated with the lower air chamber D3d through the passages P2c and P2d.

  Then, as shown in FIG. 7, the atmospheric pressure side connector C2A is connected to the three-branch branch connector C ′ via the tube T2A, and the atmospheric pressure side connector C2B is connected to the three-branch branch connector C ′ via the tube T2B. Connecting.

  That is, the passages P2A, P2a for driving the pneumatic circuit and the passages P2B, P2c, P2d for returning the closed state of the vacuum valve body 7 to the air intake pipe 4a through separate communication paths are used to prevent suction. The mechanism is configured.

  Other configurations are the same as those of the above-described prior art (Patent Document 1, Patent No. 2740110), and thus description thereof is omitted.

  Further, as shown in FIG. 8, for the convenience of construction, the tubes T1, T2A, T2B, T3, T4 are respectively connected to the tubes T1 ′, T2A ′, T2B ′, T3 ′, via the terminal box TB. It may be connected to T4 ′.

  Inside the terminal box TB, terminals connected to the upper tubes T1, T2A, T2B, T3, T4 shown in FIG. 8 and lower tubes T1 ′, T2A ′, T2B ′, T3 ′, shown in FIG. The terminals connected to T4 ′ communicate with each other internally.

  As shown in FIG. 9, the tube T2A is connected to the branch connector CA of the external air introduction thin tube 5A via the air intake thin tube 5Aa communicating with the outside air, and the tube T2B is connected to the outside air. A configuration may be adopted in which the independence of the air introduction source is further enhanced by connecting to the branch connector CB of the outside air introduction thin tube 5B via the intake thin tube 5Ba.

<Effect>
In the controller of the first embodiment configured as described above, the air in the upper air chamber D2u that causes chattering is obtained by making the air introduction source independent of the atmospheric pressure side connector C2A and the atmospheric pressure side connector C2B. Can be prevented.

  Therefore, chattering does not occur when the vacuum valve body 7 is closed, and stable closing is possible, and the vacuum sewer system can be used without reducing the sewage transfer capability of the vacuum sewer system.

  Moreover, in the vacuum valve unit of the modified example shown in FIG. 8, since the terminal box TB is provided, not only connection is facilitated, but connection mistakes due to an increase in the number of connected tubes are connected. This can be prevented by consolidating the tubes to be made in one place and clarifying the mounting location.

<Constitution>
As shown in FIG. 10, in the controller of the second embodiment, a rubber duckbill check valve CV is provided between the passage P2a and the passage P2c, and the three-way valve TV is changed from the open state to the closed state. Air intake from the pneumatic circuit drive passage P2a to the closed state return passages P2c and P2d of the vacuum valve body 7 is prevented when the state becomes an intermediate state between the open state and the closed state during the return. The

  The check valve CV is located between the second case portion 22 and the third case portion 23, between the passage P2 of the atmospheric pressure side connector C2 and the lower air chamber D2d, and from the passage P2c to the lower air chamber D2d. Allows air to flow, and prevents air flow from the lower air chamber D2d to the passage P2c.

  That is, the suction prevention mechanism is constituted by a check valve CV that prevents passage of air from the passage P2a for driving the pneumatic circuit to the passages P2c and P2d for returning the closed state of the three-way valve TV.

  Since the check valve (check valve) CV is a known technique, a detailed description thereof is omitted, and other configurations are the same as those of the above-described prior art (Patent Document 1, Patent No. 2740110). Since there is, explanation is omitted.

<Effect>
In the controller of the second embodiment configured as described above, since the check valve (check valve) CV is provided, the suction of the air in the lower air chamber D2u that causes the chattering phenomenon can be prevented. Moreover, the air flow when the water level detection diaphragm D2 is restored is not hindered.

  Therefore, chattering does not occur at the time of closing, and stable closing is possible, and the vacuum sewer system can be used smoothly.

  Moreover, since it is not necessary to form an input path such as an air intake thin tube or an outside air introduction thin tube without adding a connector, chattering can be prevented at a low cost.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to this embodiment. Included in the invention.

  In the controller of the second embodiment, the duckbill check valve is used as the check valve. However, the check valve may have any configuration.

It is a schematic sectional drawing of the vacuum valve unit which uses the vacuum valve apparatus common to invention of patent document 1 and this invention. It is a longitudinal cross-sectional view of the vacuum valve main body common to invention of patent document 1 and this invention. It is a longitudinal cross-sectional view of the vacuum valve controller of invention of patent document 1, and is a figure of the closed state of a three-way valve. It is a longitudinal cross-sectional view of the vacuum valve controller of invention of patent document 1, and is a figure of the open state of a three-way valve. It is a longitudinal cross-sectional view of the vacuum valve controller of invention of patent document 1, and is a figure of the intermediate state of the closed state and open state of a three-way valve. 1 is a cross-sectional configuration diagram of a vacuum valve controller of Embodiment 1. FIG. 1 is a schematic sectional view of a vacuum valve unit according to Embodiment 1. FIG. 6 is a schematic cross-sectional view of a first modification of the vacuum valve unit according to Embodiment 1. FIG. 6 is a schematic cross-sectional view of a second modification of the vacuum valve unit according to Embodiment 1. FIG. It is a cross-sectional block diagram of the vacuum valve controller of Example 2.

Explanation of symbols

3 Wastewater (sewage storage tank)
4a Air intake pipe (atmospheric pressure air source)
6 Suction pipe 7 Vacuum valve body 9 Vacuum discharge pipe 11 Water level detection pipe 12 Vacuum valve controller (vacuum valve control device)
C1 Water level detection connector (Air connection port for water level detection)
C2, C2A, C2B Atmospheric pressure side connector (Air source connection port)
C3 Vacuum side connector (Vacuum pressure connection port)
VC vacuum source connector (vacuum source)
CR1 The space above the cylinder space (inside the cylinder)
M Suction port (communication port for valve body drive)
TV 3-way valve (valve)
P2A, P2a passage (air source communication passage for driving pneumatic circuit)
P2B, P2c, P2d passage (air source communication passage for returning the valve body to the closed state)
P2A, P2B passage (separate communication passage)
CV check valve (check valve, suction prevention mechanism)
PW Bulkhead (Suction prevention mechanism)
V Vacuum valve device

Claims (3)

The vacuum valve unit for temporarily storing the wastewater from the building and limiting the amount of drainage to the vacuum sewage piping of the vacuum sewer system, the vacuum discharge pipe in which the inside of the pipe is in a vacuum pressure state, the sewage storage tank, and the vacuum valve A vacuum valve control device for controlling the opening and closing of the vacuum valve body of the vacuum valve device connecting the suction pipe for sucking sewage stored in the sewage storage tank and the vacuum discharge pipe,
A water level detection air connection port provided in the vacuum valve unit and communicated with a water level detection pipe that changes an internal air pressure corresponding to a water level in the sewage storage tank;
An air source connection port communicated with an atmospheric pressure air source into which the atmosphere is introduced;
A vacuum pressure connection port communicating with a vacuum source provided in the vacuum exhaust pipe;
A valve body drive communication port communicated with the upper space in the cylinder of the vacuum valve body,
Is provided,
If the air pressure in the water level detection air connection port is greater than atmospheric pressure, opening the valve body allows the valve body drive communication port to communicate with the vacuum pressure connection port, and sucks air in the upper space inside the cylinder. And open the vacuum valve body,
When the air pressure in the water level detection air connection port is less than atmospheric pressure, the valve body is closed to connect the valve body drive communication port to the air source connection port, and the air in the upper space in the cylinder A pneumatic circuit is formed, in which the vacuum valve body is closed by introducing
When the valve body of the pneumatic circuit is in an intermediate state between the open state and the closed state while returning from the open state to the closed state, the vacuum valve main body is A vacuum valve control device comprising a suction prevention mechanism for preventing air from being sucked into an air source communication path for returning to a closed state. A partition is provided between the air source communication path for returning the closed state of the vacuum valve body and the air source communication path for driving the pneumatic circuit,
The suction prevention mechanism is configured such that an air source communication path for returning the closed state of the vacuum valve body and an air source communication path for driving the pneumatic circuit are connected to the atmospheric pressure air source through separate communication paths, respectively. The vacuum valve control device according to claim 1, wherein the vacuum valve control device is configured.   The suction prevention mechanism is constituted by a check valve that prevents passage of air from the air source communication path for driving the pneumatic circuit to the air source communication path for returning the closed state of the vacuum valve body. The vacuum valve control device according to claim 1, wherein the control device is a vacuum valve control device.

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