JP2980153B2 - Control device for vacuum valve - Google Patents

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 vacuum valve used in a sewage line using a vacuum type wastewater collection system.

[0002]

2. Description of the Related Art A conventional vacuum-type wastewater collecting system is disclosed, for example, in Japanese Patent Application Laid-Open No. 2-292426. A control device for a vacuum valve in a vacuum sewage pipe is as shown in FIG. Met. In FIG. 2, one end of the vacuum valve 1 communicates with the vacuum sewage pipe 2 and the other end communicates with the vacuum valve suction pipe 3. The vacuum sewage pipe 2 communicates with a vacuum source (not shown) of a vacuum pumping station, and the vacuum valve suction pipe 3 communicates with a sewage basin where the natural drain pipes of each household gather. Vacuum valve 1
The valve element 4 disposed inside the valve body 1 is movable in and out of a closed state in which the valve body 4 is pressed against the valve seat 1b in the valve box 1a and an open state which is separated from the valve seat 1b. A piston 1d connected to the valve body 4 is disposed inside a cylinder chamber 1c formed at an upper portion of the valve box 1a, and a spring 1e for urging the valve body 4 in the closing direction is provided on the back surface of the piston 1d. I have.

The control device 5 of the vacuum valve 1 includes a pressure detection chamber 6
An atmospheric pressure chamber 8 adjacent to the pressure detection chamber 6 via a sub-diaphragm 7, a variable vacuum chamber 10 communicating with the atmospheric pressure chamber 8 through a small valve port 9, and a main diaphragm 1 connected to the variable vacuum chamber 10.
1, a distribution chamber 14 adjacent to the constant vacuum chamber 12 via a partition 13, a passage 16 communicating with the distribution chamber 14 via a large valve port 15, and a communication with the passage 16. And an air introduction hole 17 which is opened opposite to the large valve port 15, and the pressure detection chamber 6 is provided with a gas pressure introduction pipe 18.
Through the water level detection pipe 18a of the wastewater basin S, and the air introduction hole 17 is opened to the atmosphere through the ventilation pipe 19.

The atmospheric pressure chamber 8 communicates with the air introduction hole 17 through a ventilation path 20, and the distribution chamber 14 communicates with the constant vacuum chamber 12 and the variable vacuum chamber 10 through a pipe 21. A flow control valve 22 is interposed in the middle of a pipe 21 communicating with the variable vacuum chamber 10. The variable vacuum chamber 10 is provided with a valve device 23 that opens and closes the small valve port 9 in conjunction with the sub-diaphragm 7. A valve stem 24, which extends through a partition 13 separating the constant vacuum chamber 12 and the distribution chamber 14 so as to be able to move back and forth, has one end connected to the main diaphragm 11 and the other end having a valve 2 for opening and closing the large valve port 15.
5 and a partition 13 and a main diaphragm 11
A coil spring 26 interposed therebetween urges the valve 25 in the closing direction of the large valve port 15. The valve 25 moves back and forth between a position where the large valve opening 15 is closed and a position where the opening of the air introduction hole 17 is closed. The distribution chamber 14 of the control device 5 communicates with the vacuum sewage pipe 2 through the first conduit 27, and the rear chamber of the cylinder chamber 1 c in which the spring 1 e of the vacuum valve 1 resides communicates with the passage 16 through the second conduit 28. A vent pipe 19 is provided in the front chamber of the cylinder chamber 1c separated by the piston 1d.
Is connected to the intake / exhaust conduit 29 branching from the outlet.

In this configuration, when the amount of sewage in the sewage basin S is small, the valve body 4 is in a closed state in which it is pressed against the valve seat 1b, the valve device 23 closes the small valve port 9, and the valve 25 is closed. 15 is closed. In this state, the vacuum pressure in the vacuum sewage pipe 2 acts on the distribution chamber 14 through the first conduit 27,
Further, it acts on the variable vacuum chamber 10 and the constant vacuum chamber 12 through the pipe 21. Therefore, the variable vacuum chamber 10 and the constant vacuum chamber 12 have the same pressure, and the valve 25 closes the large valve port 15 by receiving the urging force of the coil spring 26. On the other hand, the atmospheric pressure in the air introduction hole 17 acts on the atmospheric pressure chamber 8 through the ventilation path 20, the sub-diaphragm 7 is separated from the valve device 23, and the valve device 23 closes the small valve port 9.

When the sewage accumulates in the sewage basin S, the internal pressure of the water level detecting pipe 18a rises as the water level rises, the air pressure acting on the pressure detecting chamber 6 through the gas pressure introducing pipe 18 increases, and the sub-diaphragm 7 The valve device 23 is displaced toward the atmospheric pressure chamber 8 and presses the valve device 23, and the valve device 23 opens the small valve port 9. When the small valve opening 9 is opened, the atmospheric pressure acting on the atmospheric pressure chamber 8 acts on the variable vacuum chamber 10, the main diaphragm 11 is displaced toward the constant vacuum chamber 12, and the valve rod 24 is biased by the coil spring 26. The valve 25 is separated from the large valve opening 15 to open the large valve opening 15 and closes the opening of the air introduction hole 17 facing the large valve opening 15.

For this reason, the distribution chamber 1 is passed through the first conduit 27.
The vacuum pressure of the vacuum sewage pipe 2 acting on 4 acts on the passage 16 through the large valve port 15 and further acts on the rear chamber of the cylinder chamber 1c through the second conduit 28. On the other hand, the cylinder chamber 1c
At the front chamber, the atmospheric pressure of the ventilation pipe 19 is acting through the intake / exhaust pipe 29, and the piston is operated by the differential pressure between the atmospheric pressure acting on the front chamber of the cylinder chamber 1c and the vacuum pressure acting on the rear chamber of the cylinder chamber 1c. 1d is retracted against the urging force of the spring 1c, and the valve body 4 is separated from the valve seat 1b to be in an open state. In this state, the sewage remaining in the sewage tank is sucked up through the vacuum valve suction pipe 3 and the vacuum sewage pipe 1.

When the water level of the sewage basin drops due to suction,
As the internal pressure of the water level detecting pipe 18a decreases, the air pressure acting on the pressure detecting chamber 6 through the gas pressure introducing pipe 18 decreases, and the sub-diaphragm 7 is pushed by the atmospheric pressure of the atmospheric pressure chamber 8 to return to the normal state. Then, the pressing force on the valve device 23 is released, and the valve device 23 closes the small valve port 9. In this state, the variable vacuum chamber 10 becomes a vacuum pressure, the main diaphragm 11 receives the urging force of the coil spring 26, returns to the normal state, and the valve 25 closes the large valve port 15. For this reason,
Atmospheric pressure acts on both the front chamber and the rear chamber of the cylinder chamber 1c, and the valve body 4 is moved by the urging force of the spring 1e.
It closes to the position where it comes into pressure contact with, and returns to the normal state.

[0009]

However, in the above-described control device, if dew condensation occurs or dust enters inside the control device, the control device may malfunction and the opening time of the vacuum valve may be prolonged. In addition, there is a problem that the gas-liquid ratio of sewage and air passing through the vacuum valve cannot be maintained at a predetermined value.

The present invention solves the above-mentioned problem. When a malfunction of the control device occurs when the vacuum valve is open,
An object of the present invention is to provide a vacuum valve control device that can forcibly close a valve body.

[0011]

In order to solve the above-mentioned problems, a control apparatus for a vacuum valve according to the present invention communicates with a vacuum pressure passage system communicating with a vacuum sewage pipe connected to a vacuum valve under atmospheric pressure. And a passage communicating with a rear chamber of the cylinder chamber of the vacuum valve, a large valve opening serving as a connection port of the vacuum pressure passage system to this passage, and a connection port of the atmospheric pressure passage system for the passage. An air introduction hole that opens to face the large valve opening, main valve means that moves back and forth over a position that closes the large valve opening and a position that closes the opening of the air introduction hole, and a constant vacuum of the vacuum pressure flow path system. A main diaphragm capable of separating the chamber from the variable vacuum chamber and receiving pressure from the variable vacuum chamber to press the main valve means toward the opening of the air introduction hole; and an atmospheric pressure chamber communicating with the variable vacuum chamber via a small valve port. Auxiliary valve means for opening and closing a small valve port arranged in the atmospheric pressure chamber;
A sub-diaphragm that partitions the pressure detection chamber and the atmospheric pressure chamber and receives the pressure of the pressure detection chamber and urges the sub-valve means in the opening direction;
A vent pipe that forms part of the atmospheric pressure flow path system and communicates with the air introduction hole; an intake / exhaust conduit that branches off from the middle of the vent pipe and communicates with the front chamber of the cylinder chamber of the vacuum valve; And a gas pressure introducing means for introducing a gas pressure into the pressure detection chamber, wherein an atmospheric pressure introducing pipe for communicating the front chamber and the rear chamber of the cylinder chamber of the vacuum valve is provided. This is one in which flow control means is interposed in the introduction pipe.

[0012]

When the vacuum valve is open, the rear chamber of the cylinder chamber is evacuated, and air is introduced into the front chamber of the cylinder chamber through a ventilation pipe through a ventilation pipe. According to the above configuration, the front chamber and the rear chamber are communicated with each other by the atmospheric pressure introduction pipe having the flow rate adjusting means, so that a small amount of air introduced into the front chamber flows into the rear chamber through the flow rate adjusting means. After a certain period of time, when both the front chamber and the rear chamber reach the atmospheric pressure, the vacuum valve is closed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to a sectional view of a main part of FIG. Members that perform the same operations as those described above with reference to FIG. 2 are denoted by the same reference numerals, and description thereof is omitted. In FIG. 1, an intake / exhaust conduit 29 guided from a ventilation pipe to a front chamber 1 f of a cylinder chamber of the vacuum valve 1 includes:
An atmospheric pressure introducing pipe 31 is provided which branches off on the way and is connected to the rear chamber 1g of the cylinder chamber. The front chamber 1f and the rear chamber 1g are provided.
Are communicated with each other by an atmospheric pressure introducing pipe 31. The atmospheric pressure introducing pipe 31 is provided with a throttle valve 32 for adjusting a flow rate of air in the pipe.

The operation of the above configuration will be described below.
When the vacuum valve 1 is open, the rear chamber 1g of the cylinder chamber
Is in a vacuum, and air is introduced into the front chamber 1f of the cylinder chamber through an intake / exhaust conduit 29 from a ventilation pipe.
However, since the atmospheric pressure introducing pipe 31 is connected to the rear chamber 1g, the air from the intake / exhaust pipe 29 is supplied to the atmospheric pressure introducing pipe 3
1 and a small amount flow into the rear chamber 1g through the throttle valve 32, and after a certain time, the pressure in the rear chamber 1g becomes atmospheric pressure. When the rear chamber 1g reaches the atmospheric pressure together with the front chamber 1f in this way, the piston 1 is pushed by the spring 1e, the piston 1 is pushed out, the valve body 4 comes into contact with the valve seat 1b, and the vacuum valve 1 is closed. Can be The same effect can be obtained by using a flow rate adjusting means such as an orifice instead of the throttle valve 32.

[0015]

As described above, according to the present invention, the front chamber and the rear chamber of the cylinder chamber of the vacuum valve are communicated with each other through the atmospheric pressure introducing pipe, and the flow rate of the throttle valve, the orifice, and the like is adjusted to the atmospheric pressure introducing pipe. Since the means is interposed, both the front chamber and the rear chamber can be set to the atmospheric pressure after a certain time,
The vacuum valve can be forcibly closed. Therefore, even when the vacuum valve is opened or the open time is prolonged due to malfunction of the control device, the vacuum valve is forcibly closed after a certain period of time in this manner, and the gas-liquid By maintaining the ratio at a predetermined value, the wastewater can be smoothly sent to the vacuum pumping station.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a control device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an overall configuration of a conventional control device.

[Explanation of symbols]

 Reference Signs List 1 vacuum valve 1c cylinder chamber 1f front chamber 1g rear chamber 4 valve body 5 control device 6 pressure detection chamber 7 sub-diaphragm 8 atmospheric pressure chamber 9 small valve port 10 variable vacuum chamber 11 main diaphragm 16 passage 17 air introduction hole 19 ventilation pipe 23 Valve device 25 Valve 29 Intake / exhaust conduit 31 Atmospheric pressure introduction pipe 32 Throttle valve (flow control means)

Claims (1)

(57) [Claims] A vacuum pressure passage system communicating with a vacuum sewage pipe connected to a vacuum valve, an atmospheric pressure passage system communicating under atmospheric pressure, a passage communicating with a rear chamber of a cylinder chamber of the vacuum valve, A large valve port serving as a connection port of the vacuum pressure flow path system to this passage;
An air introduction hole that forms a connection port of the atmospheric pressure flow path system to the passage and opens to face the large valve port, and a main port that moves back and forth over a position where the large valve port is closed and a position where the opening of the air introduction hole is closed. A valve means, a main diaphragm capable of partitioning a constant vacuum chamber and a variable vacuum chamber of the vacuum pressure flow path system and receiving pressure from the variable vacuum chamber to press the main valve means toward the opening of the air introduction hole; An atmospheric pressure chamber communicating through a valve port, sub-valve means for opening and closing a small valve port disposed in the atmospheric pressure chamber, and a sub-valve means for dividing the pressure detection chamber and the atmospheric pressure chamber and receiving the pressure of the pressure detection chamber Sub-diaphragm that urges the valve in the opening direction, a ventilation pipe that forms part of the atmospheric pressure flow path system and communicates with the air introduction hole, and branches off from the middle of the ventilation pipe and communicates with the front chamber of the cylinder chamber of the vacuum valve Gas to be introduced into the pressure detection chamber as gas pressure using the water level in the sewage tank In a control device provided with an introduction means, an atmospheric pressure introduction pipe for communicating a front chamber and a rear chamber of a cylinder chamber of a vacuum valve is provided, and a flow rate adjusting means is interposed in the atmospheric pressure introduction pipe. Control device for vacuum valve.