JPH0925662A - Controller of pneumatic working valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate malfunctions of a vacuum valve and omit an air supply pipe leading the ambient air from the outside of a vacuum valve pit and a complicated changeover control device to simplify the structure. SOLUTION: When the level of the water pool 4 in a vacuum valve pit 1 rises up to HWL and the differential pressure between a water level detector tube 8 and the outside air gets to a preset upper limit of a pressure switch 12B for detecting the high water level, the first changeover signal is output from a controller 14 to a motor-driven three-way changeover valve 15 to connect the outflow pipe 5 and the working chamber 2A of a vacuum valve 2 and open the vacuum valve 2 and suck the sewage in the water pool 4 to the sewage- collecting site 7 to discharge it. When the level of water pool 4 goes down to LWL and the differential pressure between the water level detector tube 8 and the outside air gets to a preset lower limit of the differential pressure switch 12A for lower water level detection, the second changeover signal is output from the controller 14 to the motor-driven three-way changeover switch 15 to connect the inside of the vacuum valve pit 1 and the working chamber 2A of the vacuum valve 2 and close the vacuum valve 2.

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 of 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 vacuum valve control device uses the vacuum and the atmospheric pressure to switch the switching control device, the air supply pipe is required. Due to the insufficient air supply due to the installation length and pipe diameter of the vacuum valve, the closing of the vacuum valve (pneumatic actuation valve) is delayed,
Due to the clogging of the throttling mechanism incorporated in the switching control device, there are drawbacks such as a significant delay in closing the pneumatically operated valve and the need for a switching control device which is extremely complicated in structure and relatively expensive. Was there. Therefore, the invention according to claim 1 eliminates the malfunction of the pneumatic actuating valve and omits the use of the switching control device having a complicated air supply pipe and structure.
The purpose of the present invention is to provide a control device for a pneumatic actuated valve, which has a simplified structure. The invention according to claim 2 is
It is designed so that it can be operated by a simple power supply facility.

[0007]

In order to achieve the above-mentioned 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 accompanying the water level fluctuation in the water pool, and The air-operated valve is opened by reducing the pressure inside the air-operated valve installed in the air-operated valve based on the detected water level, and the suction force of the suction means on the downstream side of the air-operated valve. By sucking and discharging the water in the water reservoir from the suction pipe on the upstream side of the pneumatic valve, by positively compressing the working chamber based on the detected water level, the pneumatic 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 differential pressure from the atmospheric pressure in the water level detection pipe is turned on when the differential pressure is equal to or higher than an upper limit set value, and the lower limit is set. O below the set value
Based on the ON signal of the two differential pressure switches that perform FF and the upper limit setting differential pressure switch, the controller outputs the first switching signal to switch the differential pressure switch and the O switch of the lower limit differential pressure switch.
An electric three-way switching valve that outputs a second switching signal from the controller based on the FF signal to switch the electric three-way switching valve, and the electric three-way switching valve is installed in the mass. A common pipe for communicating the common port with the inside of the working chamber; and a negative pressure introducing pipe for communicating the first port of the electric three-way switching valve with the negative pressure portion of the pneumatic working valve downstream side,
The second port of the electric three-way switching valve is open in the mass. According to the invention of claim 1, when the differential pressure from the atmospheric pressure in the water level detection pipe becomes equal to or higher than the upper limit set value of the upper limit set differential pressure switch as the water level in the water pool increases, the upper limit set differential pressure switch is turned on. To output the ON signal to the controller, and the controller outputs the first switching signal to the electric three-way switching valve to switch the electric three-way switching valve.
By this, the negative pressure introducing pipe → the first port of the electric three-way switching valve → the common port of the electric three-way switching valve → the path of the common pipe,
The negative pressure portion on the downstream side of the pneumatic actuation valve communicates with the actuation chamber of the pneumatic actuation valve, and a negative pressure (vacuum) is applied to the actuation chamber to open the pneumatic actuation valve. On the other hand, when the differential pressure from the atmospheric pressure in the water level detection pipe becomes less than the lower limit set value of the lower limit set differential pressure switch as the water level in the water pool falls, the lower limit set differential pressure switch turns off and the controller outputs the OFF signal. Then, 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. The invention according to claim 2 is characterized in that the control power source of the controller and the switching power source of the electric three-way switching valve are constituted by batteries installed in the mass. According to the invention described in claim 2, the control power source of the controller and the switching power source of the electric three-way switching valve can be covered by the battery installed in the mass.

[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 LWL, the low water level detection differential pressure switch 12A having a small spring constant that is turned on when the pressure in the water level detection pipe 8 reaches the lower limit value, and the water pool portion 4 inside. There is provided a high water level detecting differential pressure switch 12B having a large spring constant, which is turned on when the pressure in the water level detecting pipe 8 reaches the upper limit value by increasing the water level to HWL. That is, the water level detection pipe 8
2 of differential pressure switches 12A and 12B that are turned on when the pressure difference from the atmospheric pressure inside is higher than the upper limit set value and turned off when the pressure is lower than the lower limit set value.
One is provided. An air intake port 3A is formed near the lower end opening of the suction pipe 3.

ON / OFF of each of the low water level detecting differential pressure switch 12A and the high water level detecting differential pressure switch 12B.
The signal is input to the controller 14, and from the controller 14, the ON signal is input from both the low water level detection differential pressure switch 12A and the high water level detection differential pressure switch 12B, that is, inside the water level detection pipe 8. At the time when the differential pressure from the atmospheric pressure of the electric water becomes high up to the high water level, the switching drive unit 1 of the electric three-way switching valve 15
The first switching signal is output to 5A and the OFF signal is input from both the high water level detecting differential pressure switch 12B and the low water level detecting differential pressure switch 12A, that is, the water level detecting pipe 8
The second switching signal is output to the switching drive unit 15A of the electric three-way switching valve 15 when the differential pressure from the internal atmospheric pressure decreases to the low water level.

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 structure, when the pressure in the water level detection pipe 8 reaches the lower limit value as the water level in the water pool 4 rises to LWL, the low water level detection differential pressure switch 12A is turned on. Then, the ON signal is output to the controller 14. When the pressure in the water level detection pipe 8 reaches the upper limit value as the water level in the water pool 4 rises to HWL, the high water level detection differential pressure switch 12B is turned on and an ON signal is output to the controller 14. In this way, the two differential pressure switches 12A, 1
When the ON signal from 2B is input to the controller 14,
The switching drive unit 15 of the electric three-way switching valve 15 from the controller 14
The first switching signal is output to A, and the motorized three-way switching valve 15
Is switched. That is, when the differential pressure from the atmospheric pressure in the water level detection pipe 8 reaches the upper limit set value of the high water level detection differential pressure switch 12B, the electric three-way switching valve 15 is switched by the first switching signal, and the negative pressure introduction pipe 17 is provided. → 1st port 15C of electric three-way switching valve 15 → Common port 1 of electric three-way switching valve 15
5B → outlet pipe 5 on the downstream side of the vacuum valve 2 in the path of the common pipe 16
And the inside of the working chamber 2A of the vacuum valve 2 communicate with each other, a negative pressure (vacuum) is applied to the working chamber 2A, and the diaphragm 2a and the vacuum valve 2 are moved 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 sewage in the water reservoir 4, that is, the sewage such as domestic drainage that has flowed down from the natural flow pipe 11 to the water reservoir 4, is a suction pipe 3-> an open vacuum valve 2-> an outflow pipe 5 in a sewage collection site. 7 is sucked and discharged.

By sucking and discharging the waste water in the water reservoir 4,
As the water level in the water pool 4 drops below HWL,
When the pressure in the water level detection pipe 8 drops, first, the high water level detection differential pressure switch 12B is turned off and then the controller 14 is turned off.
Output a signal. When the water level in the water reservoir 4 further decreases to LWL and the pressure in the water level detecting pipe 8 decreases to the lower limit pressure, the low water level detecting differential pressure switch 12A is turned off and an OFF signal is output to the controller 14. Thus, when the OFF signals from the two differential pressure switches 12A and 12B are input to the controller 14, the controller 14 outputs the second switching signal to the switching drive unit 15A of the electric three-way switching valve 15. Thus, the electric three-way switching valve 15 is switched. That is, when the differential pressure from the atmospheric pressure in the water level detection pipe 8 reaches the lower limit set value of the low water level detection differential pressure switch 12A, the electric three-way switching valve 15 is switched by the second switching signal, and the electric three-way switching valve. The second port 15D of 15 → the common port 15B of the electric three-way switching valve 15 → the common pipe 16 communicates with the inside of the vacuum valve mass 1 and the inside of the working chamber 2A of the vacuum valve 2 so that the working chamber 2A
The atmospheric pressure in the vacuum valve mass 1 is applied to the diaphragm 2
a and the vacuum valve 2 are moved in the direction of the arrow Y2 to move the vacuum valve 2
To close the valve. Also, the two differential pressure switches 12A, 12
From the time when the OFF signal from B is input to the controller 14, the electric three-way switching valve 15 is switched and the vacuum valve 2
Until the valve is closed, the water level in the water reservoir 4 drops below LWL, and the suction pipe 3 is sucked from the air intake port 3A of the suction pipe 3.
Take air in.

As described above, the pressure fluctuation in the water level detecting pipe 8 due to the water level fluctuation in the water reservoir 4 is detected by the differential pressure switch 12A,
12B ON / OFF signal is converted and output.
The vacuum valve 2 is configured to be opened and closed by switching the electric three-way switching valve 15 based on the OFF signal output, and when the vacuum valve 2 is closed, the air (atmospheric pressure) in the vacuum valve mass 1 is removed. Since the load is applied to the working chamber 2A of the vacuum valve 2, the conventionally used switching control device 9 having a complicated structure and the air supply pipe 10 (see FIG. 2) for supplying the outside air are 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. Therefore, as in the conventional case, due to the malfunction that the valve closing of the vacuum valve 2 is significantly delayed,
There is no inconvenience that the suction means 6 composed of a vacuum pump runs unnecessarily idle. Further, since the control power supply of the controller 14 and the switching power supply of the electric three-way switching valve 15 can be covered by the battery 19 installed in the vacuum valve mass 1, the control power supply and the switching power supply are supplied from the outside of the vacuum valve mass 1. In this respect, it is possible to contribute to simplification of the equipment.

Further, the differential pressure switches 12A and 12B are turned off.
If the vacuum valve 2 does not open after N, the vacuum valve 2
An alarm can be issued by judging that the valve cannot be opened. Further, if the vacuum valve 2 does not close after the differential pressure switches 12A and 12B are turned off, it is possible to judge that the vacuum valve 2 cannot be closed and issue 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. Claim 2
In the invention described, the control power supply of the controller and the switching power supply of the electric three-way switching valve can be covered by the battery installed in the mass, so it is not necessary to supply the control power supply and the switching power supply from outside the mass. From the point, it can contribute to simplification of equipment.

[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 operation valve) 3 suction pipe 4 water reservoir 5 outflow pipe 6 vacuum pump (suction means) 8 water level detection pipe 12A low water level differential pressure switch (lower limit differential pressure switch) 12B High water level differential pressure switch (upper limit differential pressure switch) 14 Controller 15 Electric three-way switching valve 15A Electric three-way switching valve switching drive unit 15B Electric three-way switching valve common port 15C Electric three-way switching valve No. 1 1 port 15D 2nd port of electrically operated three-way switching valve 16 Common tube 17 Negative pressure introduction tube 19 Battery

Claims (2)

[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, it is turned on when the differential pressure from the atmospheric pressure in the water level detection pipe is equal to or higher than an upper limit set value. , Two differential pressure switches that are turned off below the lower limit set value, and a first switching signal is output from the controller based on the ON signal of the upper limit set differential pressure switch to switch the lower limit differential pressure switch OFF signal. From controller based on An electric three-way switching valve that outputs a switching signal to switch the electric three-way switching valve is installed in the mass, and a common port of the electric three-way switching valve communicates with the inside of the working chamber. With a common pipe to
It is provided with a negative pressure introducing pipe that connects the first port of the electric three-way switching valve and the negative pressure portion on the downstream side of the pneumatic actuating valve, and the second port of the electric three-way switching valve is opened in the mass. A control device for a pneumatically actuated valve. 2. The control device for the pneumatically actuated valve according to claim 1, wherein the control power source for the controller and the switching power source for the electric three-way switching valve are batteries installed in the mass.