JPH0925661A - Pneumatic actuated valve controller - Google Patents

Abstract

(57) [Abstract] [Purpose] To eliminate the malfunction of the vacuum valve and to simplify the structure by omitting the use of the air supply pipe for introducing the outside air from the outside of the vacuum valve mass and the complicated switching control device of the structure. [Structure] The water level in the water reservoir 4 of the vacuum valve mass 1 is HWL.
The pressure inside the water level detection pipe 8 rises to the pressure switch 1
When the upper limit setting value of 2 is reached, the controller 14 outputs the first switching signal to the electric three-way switching valve 15, and the outflow pipe 5 and the vacuum valve 2
By connecting the working chamber 2A of the above, the vacuum valve 2 is opened, the dirty water in the water pool 4 is sucked and discharged to the sewage collection site 7 side, the water level in the water pool 4 drops below LWL, and the suction pipe The air is sucked in through the air intake port 3A of the No. 3 upstream position P
When the differential pressure between 1 and the downstream position P2 reaches the lower limit set value of the differential pressure switch 13, the differential pressure switch 13 is turned off, and the controller 14 outputs a second switching signal to the electric three-way switching valve 15. By connecting the inside of the vacuum valve mass 1 and the working chamber 2A of the vacuum valve 2 to each other, the vacuum valve 2 is closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a pneumatic actuated valve that is opened and closed by pneumatic pressure, such as a vacuum valve of a vacuum sewage collection system.

[0002]

2. Description of the Related Art Conventionally, as a control device for a vacuum valve of a vacuum type sewage collection system, for example, US Pat.
The one shown in No. 3,838 is known. As shown in FIG. 2, this control device causes the inlet of the suction pipe 3 on the upstream side of the vacuum valve 2 installed in the vacuum valve mass 1 to face the inside of the water pool 4 and to flow out of the vacuum valve 2 on the downstream side. The outlet of the pipe 5 is opened to a sewage collection site 7 equipped with a suction means 6 composed of a vacuum pump, and a water level detection pipe 8 is installed in the water pool part 4 to detect the water level in accordance with the water level fluctuation in the water pool part 4. The water level is detected by the pressure change in 8 and the water level in the water reservoir 4 is the upper limit HW.
By guiding the high pressure in the water level detection pipe 8 when it rises to L to the switching control device 9, the switching control device 9 is switched and operated by the negative pressure (vacuum) on the outflow pipe 5 side, and the vacuum valve 2 is operated. The vacuum valve 2 is opened by applying a negative pressure on the outflow pipe 5 side to the inside of the chamber. As a result, due to the atmospheric pressure acting on the wastewater in the water reservoir 4 and the differential pressure on the side of the sewage collection site 7, the wastewater in the water reservoir 4, that is, the domestic drainage flowing down from the natural flow pipe 11 to the water reservoir 4. Waste water such as is sucked and discharged to the side of the sewage collection site 7 through the path of the suction pipe 3, the open vacuum valve 2, and the outflow pipe 5.

When the sewage in the water reservoir 4 is sucked and discharged to the sewage collection site 7 side, the level of the sewage surface lowers to the lower limit LWL and the pressure in the water level detection pipe 8 drops to almost atmospheric pressure. By guiding this atmospheric pressure to the switching control device 9,
The vacuum control valve 9 is switched by the outside air (atmosphere) supplied from the air supply pipe 10, and the atmospheric pressure supplied from the air supply pipe 10 is loaded into the operation chamber of the vacuum valve 2 to close the vacuum valve 2. .

On the other hand, the switching control device 9 incorporates a throttling mechanism which works as a delay mechanism for delaying the valve closing timing of the vacuum valve 2. That is, even if the air pressure in the water level detection pipe 8 drops to almost atmospheric pressure for the above-mentioned reason, the atmosphere supplied from the air supply pipe 10 to the working chamber of the vacuum valve 2 through the switching control device 9 is switched to the switching control device 9. The throttle valve mechanism does not immediately close the vacuum valve 2 by passing through the throttle valve when passing through, and delays the closing of the vacuum valve 2 until the point where the air-water mixture ratio of sewage and air reaches a predetermined value. ing.

As described above, the conventional control device has the outflow pipe 5
The negative pressure (vacuum) on the side and the atmosphere (atmospheric pressure) introduced from the air supply pipe 10 are used to switch the switching control device 9, and the switching control device 9 functions as a delay mechanism. A diaphragm mechanism is incorporated. Therefore, the air supply pipe 10 is required for air supply. However, if the laid length of the air supply pipe 10 is too long or the pipe diameter is small, there is a risk that the supply of the atmosphere will be insufficient and the valve closing of the vacuum valve 2 will be delayed. There is. The aperture mechanism incorporated in the switching control device 9 has a hole diameter of 1 m.
Since it is composed of an extremely small orifice around m, it is blocked by solid particles contained in the atmosphere or water droplets caused by condensation of atmospheric water vapor, which causes a malfunction that greatly delays the closing of the vacuum valve 2. As a result of such a malfunction, such an erroneous operation causes an unnecessary load (idle operation) on the suction means 6 which is a vacuum pump. Moreover, there is a drawback that the switching control device 9 having a very complicated structure and relatively expensive is required.

[0006]

That is, since the conventional control device for the pneumatic actuating valve uses the vacuum and the atmospheric pressure to switch the switching control device, the air supply pipe is required. Due to insufficient air supply due to the installation length and diameter of the air supply pipe, the valve closing of the vacuum valve (pneumatic actuation valve) is delayed, and the clogging of the throttle mechanism incorporated in the switching control device causes the pneumatic actuation valve to be closed. Has a drawback in that it significantly delays the closing of the valve and requires a switching controller which is extremely complicated in structure and relatively expensive. Therefore, claim 1
The invention described above provides a control device for a pneumatically operated valve, which eliminates the malfunction of the pneumatically operated valve, omits the use of a switching control device having a complicated air supply pipe and structure, and has a simplified structure. It is intended for.

[0007]

In order to achieve the above object, the invention according to claim 1 detects the water level in the water pool by detecting the pressure change in the water level detection pipe due to the water level fluctuation in the water pool, and detects the water level in the mass. The air-operated valve is opened by reducing the pressure inside the installed air-operated valve based on the detected water level, and by the suction force of the suction means on the downstream side of the air-operated valve. Intake and discharge water in the water pool from the suction pipe on the upstream side of the pneumatic actuating valve, and positively pressure the working chamber based on the detected water level, thereby closing the pneumatic actuating valve, In a control device for a pneumatically operated valve configured to block the suction force of a suction means from reaching the suction pipe, the pressure in the water level detection pipe is turned on when the pressure is above an upper limit set value and is turned off when the pressure is below a lower limit set value. Pressure switch and Differential pressure upstream position and the downstream position of the tube is turned ON in the above upper limit set value, OFF below the lower limit set value
And a first switching signal is output from the controller based on the ON signal of the pressure switch and the second switching signal is output from the controller based on the OFF signal of the differential pressure switch. An electrically operated three-way switching valve that is switched, the electrically operated three-way switching valve is installed in the mass, and a common pipe that connects the common port of the electrically operated three-way switching valve and the inside of the working chamber to each other The second port of the electric three-way switching valve is equipped with a negative pressure introducing pipe that connects the first port of the three-way switching valve and the negative pressure portion on the downstream side of the pneumatic operating valve.
The port is open in the mass. According to the invention described in claim 1, when the pressure in the water level detection pipe becomes equal to or higher than the upper limit set value of the pressure switch due to the rise of the water level in the water pool, the pressure switch is turned on and an ON signal is output to the controller to perform control. The first switching signal is output from the device to the electric three-way switching valve to switch the electric three-way switching valve. As a result, the negative pressure introduction pipe → the first of the electric three-way switching valves
Port → common port of electrically operated three-way switching valve → common pipe path, the negative pressure part on the downstream side of the air operated valve communicates with the operation chamber of the air operated valve, and a negative pressure (vacuum) is applied to the operation chamber. To open the pneumatic actuating valve. The pneumatic actuation opens the valve,
Due to the atmospheric pressure acting on the water in the water pool and the differential pressure on the downstream side of the pneumatic valve, the water in the water pool is sucked into the suction pipe and sucked downstream of the pneumatic valve. At the start of suction when the water in the water pool is sucked into the suction pipe, the differential pressure between the upstream position and the downstream position in the suction pipe (pressure at the upstream position> pressure at the downstream position) exceeds the upper limit set value of the differential pressure switch. Turn on the differential pressure switch. On the other hand, when the water level detection pipe internal pressure becomes equal to or lower than the lower limit set value of the pressure switch as the water level in the water pool decreases, the pressure switch is turned off. On the other hand, when air begins to be sucked into the suction pipe, the differential pressure between the upstream position and the downstream position in the suction pipe falls below the lower limit set value of the differential pressure switch (upstream position pressure = downstream position pressure), and the differential pressure Switch O
The FF is performed and the OFF signal is output to the controller, and the controller outputs the second switching signal to the electric three-way switching valve to switch the electric three-way switching valve. As a result, the second electric three-way switching valve
Port-> Common port of electric three-way switching valve-> Common pipe path, the inside of the mass communicates with the working chamber of the pneumatic actuating valve, and positive pressure (atmospheric pressure) is applied to the working chamber to operate pneumatically. Close the valve.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The same or corresponding parts as those in the conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted.
In FIG. 1, the vacuum valve mass 1 is formed above the water sump 4, and the water sump 4 and the vacuum valve mass 1 are integrated. Then, when the water level in the water pool portion 4 rises to HWL, the pressure in the water level detection pipe 8 is turned on when the pressure reaches the upper limit set value, and the water level in the water pool portion 4 drops to LWL, thereby detecting the water level. A pressure switch 12 is provided which is turned off when the pressure in the pipe 8 drops to the lower limit set value. Further, there are pressure outlets at two positions of the upstream position P1 and the downstream position P2 of the suction pipe 3, and the differential pressure switch 13 is turned on when the differential pressure between P1 and P2 is equal to or higher than the upper limit set value and is turned off when it is equal to or lower than the lower limit set value. Is provided, and an air intake port 3A is formed in the vicinity of the lower end opening of the suction pipe 3.

The ON / OFF signal of the pressure switch 12 is input to the controller 14, and from the controller 14, the time when the ON signal is input from the pressure switch 12, that is, the pressure in the water level detection pipe 8 is the upper limit set value. When the temperature becomes high, the first switching signal is output to the switching drive unit 15A of the electric three-way switching valve 15. Further, the ON / OFF signal of the differential pressure switch 13 is also input to the controller 14, and from the controller 14, when the OFF signal is input from the pressure switch 12 and the differential pressure switch 13, that is, in the water level detection pipe 8. At the time when the pressure rises to the upper limit set value, that is, when the differential pressure between the upstream position P1 and the downstream position P2 of the suction pipe 3 decreases to the lower limit set value, the switching drive unit 15A of the electric three-way switching valve 15
The second switching signal is output to.

The electric three-way switching valve 15 is installed in the vacuum valve mass 1, and its common port 15B and the inside of the working chamber 2A of the vacuum valve 2 communicate with each other via a common pipe 16. Outflow pipe 5 downstream of the first port 15C and the vacuum valve 2
The (negative pressure portion) communicates with each other via the negative pressure introducing pipe 17, and the second port 15D is opened in the vacuum valve mass 1. Further, the battery 19 installed in the vacuum valve mass 1 constitutes a control power supply for the controller 14 and a switching power supply for the electric three-way switching valve 15.

With such a configuration, when the pressure in the water level detection pipe 8 reaches the upper limit set value of the pressure switch 12 as the water level in the water reservoir 4 rises to HWL, the pressure switch 12 is turned on. Then, the ON signal is output to the controller 14. Based on the ON signal input from the pressure switch 12, the controller 14 outputs the first switching signal to the switching drive unit 15A of the electric three-way switching valve 15 to switch the electric three-way switching valve 15. As a result, the negative pressure introducing pipe 17 →
In the path of the first port 15C of the electric three-way switching valve 15 → the common port 15B of the electric three-way switching valve 15 → the common pipe 16,
The outflow pipe 5 on the downstream side of the vacuum valve 2 communicates with the inside of the working chamber 2A of the vacuum valve 2, and a negative pressure (vacuum) is applied to the working chamber 2A to move the diaphragm 2a and the vacuum valve 2 in the arrow Y1 direction. To open the vacuum valve 2. By opening the vacuum valve 2, due to the atmospheric pressure acting on the wastewater in the water reservoir 4 and the differential pressure on the side of the sewage collection site 7, the wastewater in the water reservoir 4, that is, the natural flow pipe 11 to the water reservoir. Sewage such as domestic wastewater that has flowed down to 4 is suction pipe 3 → vacuum valve 2 that is open
→ It is sucked and discharged to the sewage collection site 7 side through the outflow pipe 5.
At the start of suction when the dirty water in the water pool 4 is sucked into the suction pipe 3, the differential pressure switch between the upstream position P1 and the downstream position P2 in the suction pipe 3 (the pressure at the upstream position P1> the pressure at the downstream position P2) is the differential pressure switch. 13 or more upper limit set value
Turn ON.

By sucking and discharging the waste water in the water reservoir 4,
The water level in the water pool 4 drops to LWL, and the water level detection pipe 8
When the internal pressure drops to the lower limit set value of the pressure switch 12, first, the pressure switch 12 is turned off and an OFF signal is output to the controller 14. The water level in the water pool 4 is LW
When the pressure falls below L and the air is sucked into the suction pipe 3 from the air intake port 3A of the suction pipe 3, the differential pressure between the upstream position P1 and the downstream position P2 in the suction pipe 3 becomes a differential pressure switch 13. Becomes the lower limit set value (the pressure at the upstream position P1 and the pressure at the downstream position P2 become substantially equal), and the differential pressure switch 13 is turned off.
Then, the OFF signal is output to the controller 14, and the controller 14 outputs the second switching signal to the switching drive unit 15A of the electric three-way switching valve 15 to switch the electric three-way switching valve 15. As a result, the inside of the vacuum valve mass 1 and the inside of the working chamber 2A of the vacuum valve 2 are arranged in the path of the second port 15D of the electric three-way switching valve 15 → the common port 15B of the electric three-way switching valve 15 → the common pipe 16. In communication, the working chamber 2A is loaded with the atmospheric pressure in the vacuum valve mass 1, and the diaphragm 2a and the vacuum valve 2 are connected to the arrow Y2.
And the vacuum valve 2 is closed.

As described above, when the pressure in the water level detection pipe 8 reaches the upper limit set value of the pressure switch 12 as the water level in the water reservoir 4 rises, the pressure switch 12 is turned on and output. Electric three-way switching valve 15 based on output
By switching the valve, the vacuum valve 2 is opened, and the air is sucked into the suction pipe 3 as the water level in the water reservoir 4 decreases, so that the upstream position P1 and the downstream position P in the suction pipe 3 are changed.
When the differential pressure of 2 reaches the lower limit set value of the differential pressure switch 13, the differential pressure switch 13 is turned off and output.
The vacuum valve 2 is configured to be closed by switching the electric three-way switching valve 15 based on the signal output, and when the vacuum valve 2 is closed, the air (atmospheric pressure) in the vacuum valve mass 1 is closed.
Is applied to the working chamber 2A of the vacuum valve 2, the switching control device 9 having a complicated structure conventionally used.
Therefore, the air supply pipe 10 (see FIG. 2) for supplying the outside air is not required. Therefore, the structure can be simplified. Moreover, since the diameter of the electrically operated three-way switching valve 15 can be made relatively large, the electrically operated three-way switching is performed by solid particles contained in the air in the vacuum valve mass 1 or water droplets generated by condensation of water vapor in the air. The valve 15 will not be clogged. As a result, the vacuum valve 2 can be closed at an appropriate timing. For this reason, unlike the conventional case, there is no inconvenience that the suction means 6 composed of the vacuum pump is unnecessarily idled due to a malfunction in which the valve closing of the vacuum valve 2 is significantly delayed.

Further, when the vacuum valve 2 does not open after the pressure switch 12 is turned on, the differential pressure switch 13
Is not turned on, it is possible to detect an inability to open the vacuum valve 2 by the occurrence of such a state and issue an alarm. Further, when the vacuum valve 2 does not close after the pressure switch 12 turns off, the differential pressure switch 13 does not turn off. Therefore, the occurrence of such a state detects that the vacuum valve 2 cannot be closed, You can also give an alarm.

In the above embodiment, the water pool 4
However, the water reservoir 4 and the vacuum valve mass 1 may be separated from each other.

[0016]

As described above, according to the first aspect of the present invention, the pneumatic actuating valve is opened and closed by switching the electrically operated three-way switching valve, and when the pneumatic actuating valve is closed, the air in the mass is closed. Is loaded into the working chamber of the pneumatic actuating valve, there is no need for a switching control device having a complicated structure and an air supply pipe for supplying outside air, unlike the conventional case. Therefore, the structure can be simplified. Moreover, since the electric three-way switching valve has a relatively large diameter, it is not clogged with solid particles contained in the air in the mass or water droplets generated by condensation of water vapor in the air.
As a result, the pneumatic actuating valve can be closed at an appropriate timing. For this reason, unlike the conventional case, the malfunction of the pneumatically-operated valve, which greatly delays the closing of the pneumatically operated valve, does not cause the inconvenience of the suction means performing an unnecessary idle operation.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional example.

[Explanation of symbols]

 1 vacuum valve mass (mass) 2 vacuum valve (pneumatic valve) 3 suction pipe 4 water reservoir 5 outflow pipe 6 vacuum pump (suction means) 8 water level detection pipe 12 pressure switch 13 differential pressure switch 14 controller 15 electric three-way Switching valve 15A Switching drive part of electric three-way switching valve 15B Common port of electric three-way switching valve 15C First port of electric three-way switching valve 15D Second port of electric three-way switching valve 16 Common pipe 17 Negative pressure introducing pipe

Claims (1)

[Claims] 1. A water level in the water pool is detected by a pressure change in a water level detecting pipe due to a water level fluctuation in the water pool.
The air-operated valve of the suction means on the downstream side of the air-operated valve is opened by reducing the pressure in the working chamber of the air-operated valve installed in the mass based on the detected water level. By suctioning and discharging the water in the water pool from the suction pipe on the upstream side of the pneumatic actuating valve by suction force, and by making the working chamber positive pressure based on the detected water level, the pneumatic actuating valve is closed. In a control device for a pneumatically actuated valve configured to block the suction force of the suction means from reaching the suction pipe, the pressure in the water level detection pipe is turned on at an upper limit set value or more and is set at a lower limit set value or less. A pressure switch that turns off with
A differential pressure switch that is turned on when the differential pressure between the upstream position and the downstream position in the suction pipe is equal to or higher than the upper limit set value and is turned off when the differential pressure is equal to or lower than the lower limit set value, and a first switching signal from the controller based on an ON signal of the pressure switch. An electric three-way switching valve that is output and switched and that is switched by outputting a second switching signal from the controller based on the OFF signal of the differential pressure switch, and the electric three-way switching valve is installed in the mass. And a common pipe for communicating the common port of the electrically operated three-way switching valve with the inside of the working chamber, and the first of the electrically operated three-way switching valve.
A negative pressure introducing pipe that connects the port and a negative pressure portion on the downstream side of the pneumatic actuating valve, and the second port of the electrically operated three-way switching valve opens in the mass. Control device.