JPH07293737A - Vacuum valve controller - Google Patents

Abstract

PURPOSE:To prevent the malfunction of a control device in closing a valve element, and realize the smooth operation of the valve element by providing a communicating port whose diameter is smaller than the inner diameter of an atmosphere introducing port in a connection part of the atmosphere introducing port to a passage. CONSTITUTION:A communicating port 17a whose diameter is smaller than the inner diameter of an atmosphere introducing port 17 in a connection part of the atmosphere introducing port to a passage. The atmospheric air in the atmospheric passage system flows into a cylinder chamber of a vacuum valve from the atmosphere introducing port 17 through the passage 16. Because the diameter of the communication port 17a is smaller than the inner diameter of the atmosphere introducing port 17 at the connection part of the atmosphere introducing port 17 to the passage 16, the pressure difference is generated between the sides across the communicating port 17a, and the positive pressure generated in the atmosphere introducing port 17 is applied to the atmospheric chamber through a ventilation passage 20. The diaphragm is not malfunctioned to open a valve means, and the vacuum valve can be smoothly 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 vacuum valve used in a vacuum sewer line.

[0002]

2. Description of the Related Art Conventionally, for example, a control device for a vacuum valve in a vacuum sewer pipe known from Japanese Patent Laid-Open No. 2-292426 has been shown in FIG. In FIG. 3, the vacuum valve 1 has one end communicating with the vacuum waste water pipe 2 and the other end communicating 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 flow-down pipes of each household gather. The valve body 4 arranged inside the vacuum valve 1 has a valve seat 1 in the valve box 1a.
It can freely move in and out between a closed state in which it is pressed against b and an open state in which it is separated from the valve seat 1b. Inside the cylinder chamber 1c formed in the upper part of the valve box 1a, the piston 1 connected to the valve body 4 is provided.
d is arranged, and a spring 1e for urging the valve body 4 in the closing direction is provided on the back surface of the piston 1d.

The control device 5 for 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 variable vacuum chamber 10 connected to the main diaphragm 1
1 adjacent to the constant vacuum chamber 12, a distribution chamber 14 adjacent to the constant vacuum chamber 12 via a partition wall 13, a passage 16 communicating with the distribution chamber 14 via the large valve port 15, and a passage 16 communicating with the passage 16. In addition, the pressure detection chamber 6 is provided with an air introduction hole 17 that opens to face the large valve opening 15 and the gas pressure introduction pipe 18 is provided.
Through a waste water tank (not shown) through the air introduction hole 17
Is open to the atmosphere through the ventilation pipe 19.

The atmospheric pressure chamber 8 communicates with the atmosphere introducing 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 rate adjusting valve 22 is provided 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 opening 9 in conjunction with the sub diaphragm 7. A valve rod 24, which is arranged so as to pass through a partition wall 13 that separates the constant vacuum chamber 12 and the distribution chamber 14 in a retractable manner, connects one end to the main diaphragm 11 and opens and closes the large valve port 15 at the other end.
5, the partition wall 13 and the main diaphragm 11 are provided.
A coil spring 26 interposed between the springs urges the valve 25 in the closing direction. The valve 25 extends and retracts over a position where the large valve port 15 is closed and a position where the opening of the atmosphere introduction hole 17 is closed. The distribution chamber 14 of the control device 5 communicates with the vacuum waste water pipe 2 through the first conduit 27, and the rear chamber of the cylinder chamber 1c in which the spring 1e of the vacuum valve 1 is present communicates with the passage 16 through the second conduit 28. An intake / exhaust pipe 29 branched from the ventilation pipe 19 communicates with the front chamber of the cylinder chamber 1c which is separated from the piston 1d.

In this structure, a sewage basin (not shown)
When the amount of dirty water 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 opening 9, and the valve 25 closes the large valve opening 15. In this state, the vacuum pressure in the vacuum dirty water pipe 2 is passed through the first conduit 27 to the distribution chamber 14
And further acts on the variable vacuum chamber 10 and the constant vacuum chamber 12 through the pipe 21. Therefore, the variable vacuum chamber 10
The constant pressure in the constant vacuum chamber 12 becomes the same, and the valve 25 closes the large valve opening 15 under the biasing 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 air passage 20, the sub diaphragm 7 is separated from the valve device 23, and the valve device 23 closes the small valve opening 9.

When the wastewater is collected in the wastewater tank, the gas pressure introducing pipe 18
Through this, the air pressure acting on the pressure detection chamber 6 increases, the sub-diaphragm 7 is displaced toward the atmospheric pressure chamber 8 side 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 side, and the valve rod 24 is biased by the coil spring 26. The valve 25 separates from the large valve opening 15 to open the large valve opening 15 and closes the opening of the atmosphere introduction hole 17 facing the large valve opening 15.

[0007] Therefore, the distribution chamber 1 through the first conduit 27
The vacuum pressure of the vacuum waste water 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
The atmospheric pressure of the ventilation pipe 19 acts on the front chamber of the cylinder chamber through the intake and exhaust pipes 29, and the piston is generated 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 retracts against the urging force of the spring 1c, and the valve body 4 is separated from the valve seat 1b and is in the open state. In this state, the sewage accumulated in the sewage basin is sucked up through the vacuum valve suction pipe 3 and the vacuum sewage pipe 1.

When the water level in the sewage basin drops due to suction,
The air pressure acting on the pressure detection chamber 6 is reduced through the gas pressure introduction pipe 18, the sub-diaphragm 7 is pushed by the atmospheric pressure of the atmospheric pressure chamber 8 and returns to a normal state, the pressing force on the valve device 23 is released, and the valve device 23 is released. The device 23 closes the small valve opening 9. In this state, the variable vacuum chamber 10 becomes a vacuum pressure and the main diaphragm 11
Receives the biasing force of the coil spring 26 and returns to the normal state, and the valve 25 closes the large valve opening 15. For this reason, the atmospheric pressure acts on both the front chamber and the rear chamber of the cylinder chamber 1c, and the urging force of the spring 1e causes the valve element 4 to close to a position where it is in pressure contact with the valve seat 1b, and the normal state is restored.

[0009]

However, in the above-mentioned conventional structure, when the suction of the waste water from the waste water tank is completed and the valve 25 is separated from the opening of the atmosphere introduction hole 17 to close the large valve port 15, the cylinder is closed. Air flows into the chamber 1c from the atmosphere introducing hole 17 through the second conduit 28 and the passage 16. At this time, if the conduit of the ventilation pipe 19 communicating with the air introduction hole 17 is long or bent, the inside of the air introduction hole 17 becomes negative due to pressure loss. This negative pressure acts on the atmospheric pressure chamber 8 through the ventilation passage 20, the sub-diaphragm 7 is sucked and displaced to the atmospheric pressure chamber 8 side, and the state is the same as when the water level in the sewage basin is detected. It malfunctions.

For this reason, there has been a problem that the valve body 4 causes a phenomenon called double cycling, that is, the valve body 4 which is once closed and opens again, and malfunctions. The present invention solves the above problems, and an object of the present invention is to provide a vacuum valve control device capable of preventing a malfunction of the control device when the valve body is closed and smoothly operating the valve body. .

[0011]

In order to solve the above-mentioned problems, a control device for a vacuum valve according to the present invention has a vacuum pressure passage system communicating with a vacuum pipeline connected to the vacuum valve and a large-scale communication communicating under atmospheric pressure. A large valve that forms an air pressure passage system, a passage that communicates with the cylinder chamber of the vacuum valve, a large valve opening that forms a connection port of the vacuum pressure passage system for this passage, and a connection opening of the atmospheric pressure passage system for the passage. Atmosphere inlet opening facing the mouth, main valve means for moving back and forth over the position that closes the large valve opening and the position where the opening of the atmosphere introducing hole is closed, constant pressure chamber and variable vacuum chamber of the vacuum pressure flow path system The partition is connected to the main diaphragm that can press the main valve means toward the opening of the atmosphere introduction hole in response to the pressure of the variable vacuum chamber, and communicates with the variable vacuum chamber through the small valve port, and to the atmosphere introduction hole through the ventilation passage. Opening and closing the communicating atmospheric pressure chamber and the small valve port located in the atmospheric pressure chamber In the control device, there is provided a sub-valve means for separating the pressure detection chamber and the atmospheric pressure chamber, and a sub-diaphragm for urging the sub-valve means in the opening direction by receiving the pressure of the pressure detection chamber. A connection port having a diameter smaller than the inner diameter of the atmosphere introduction hole is provided in the connection portion with.

[0012]

With the above-described structure, the atmospheric air in the atmospheric pressure passage system flows into the cylinder chamber of the vacuum valve from the atmospheric air introduction hole through the passage. At this time, since the communication port is smaller in diameter than the inner diameter of the air introduction hole at the connection portion between the air introduction hole and the passage, a pressure difference is generated between both sides of the air introduction hole, and a positive pressure generated in the air introduction hole is generated. Since the pressure acts on the atmospheric pressure chamber through the ventilation path, the vacuum valve can be smoothly closed without causing the diaphragm to malfunction to open the valve means unlike the conventional case.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Members having the same functions as those described above with reference to FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1, the passage 16 and the air introduction hole 17 are provided.
A communication port 17a having a diameter smaller than the inner diameter of the atmosphere introduction hole 17 is provided at the connection portion with the air introduction hole 17, that is, the opening portion of the atmosphere introduction hole 17, and a difference in inner diameter is formed in the atmosphere introduction hole 17 by the communication port 17a.

According to this structure, when the water level in the sewage basin is lowered by suction, the air pressure acting on the pressure detection chamber 6 through the gas pressure introduction pipe 18 is reduced, and the sub diaphragm 7 is pushed to the atmospheric pressure in the atmospheric pressure chamber 8. Then, the normal state is restored, the pressing force on the valve device 23 forming the auxiliary valve means is released, and the valve device 2
3 closes the small valve opening 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 to return to the normal state, and the valve 25 forming the main valve means closes the large valve port 15.

Therefore, atmospheric pressure acts on the rear chamber of the cylinder chamber 1c, and the same pressure is generated on both sides of the piston 1d, and the valve element 4 is moved by the urging force of the spring 1e.
Closes to the position where it presses against and returns to the normal state. When the valve body 4 of the vacuum valve 1 is closed, the atmosphere flows into the rear chamber of the cylinder chamber 1c through the second conduit 28 and the passage 16 from the atmosphere introduction hole 17 and the ventilation pipe 19 forming the atmospheric pressure passage system. .

At this time, since the communication port 17a has a diameter smaller than the inner diameter of the air introduction hole 17 at the connecting portion between the air introduction hole 17 and the passage 16, a pressure difference is generated between both sides of the communication port 17a. Since the positive pressure generated in the atmosphere introduction hole 17 acts on the atmospheric pressure chamber 8 through the ventilation passage 20, the auxiliary diaphragm 7 is not accidentally displaced to the atmospheric pressure chamber 8 side as in the conventional case, and the valve device 23 and The vacuum valve 1 can be smoothly closed without malfunction of the valve 25.

FIG. 2 shows another embodiment of the present invention. Members having the same functions as those of the previous embodiment are designated by the same reference numerals and the description thereof will be omitted. In FIG. 2, an orifice plate 31 is provided in the middle of the atmosphere introducing hole 17 at a position between the opening 17 b of the atmosphere introducing hole 17 for the passage 16 and the opening 20 a of the ventilation passage 20 for the atmosphere introducing hole 17. Reference numeral 31 has an orifice hole 31 a having a diameter smaller than the inner diameter of the air introduction hole 17.

In this structure, the atmosphere is the orifice hole 31a.
When passing through, a pressure difference is generated between both sides of the orifice plate 31, and the positive pressure inside the air introduction hole 17 acts on the atmospheric pressure chamber 8 through the ventilation passage 20, preventing malfunction of the control device 5. Thus, the vacuum valve 1 can be smoothly closed. Other functions and effects are similar to those of the previous embodiment.

[0020]

As described above, according to the present invention, a difference in inner diameter is formed in the atmosphere introducing hole, and the positive pressure generated in the atmosphere introducing hole is applied to the atmospheric pressure chamber through the ventilation passage. Moreover, the vacuum valve can be smoothly closed without the control device malfunctioning.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing a main part of a control device according to another embodiment of the present invention.

FIG. 3 is an overall cross-sectional view showing a conventional control device.

[Explanation of symbols]

 1 Vacuum valve 1c Cylinder 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 Atmosphere introduction hole 20 Vent passage 23 Valve device 25 Valve

Claims (1)

[Claims] 1. A vacuum pressure flow channel system communicating with a vacuum pipe line connected to a vacuum valve, an atmospheric pressure flow channel system communicating with atmospheric pressure, a passage communicating with a cylinder chamber of a vacuum valve, and a vacuum pressure flow to this passage. A large valve opening that forms a connection opening of the passage system, an atmosphere introduction hole that forms a connection opening of the atmospheric pressure flow path system to the passage and opens facing the large opening, a position that closes the large opening, and an atmosphere introduction A main valve means that extends and retracts over a position that closes the opening of the hole,
The constant pressure chamber and the variable vacuum chamber of the vacuum pressure flow path system are partitioned to receive the pressure of the variable vacuum chamber and to press the main valve means toward the opening of the atmosphere introduction hole, and the variable vacuum chamber via a small valve opening. The atmospheric pressure chamber that communicates with the atmosphere introduction hole through the ventilation passage, the sub-valve means that opens and closes the small valve port arranged in the atmospheric pressure chamber, and the pressure detection chamber and the atmospheric pressure chamber that are separated from each other. In a control device provided with a sub-diaphragm that receives pressure and biases the sub-valve means in the opening direction, a connecting port having a diameter smaller than the inner diameter of the air introducing hole is provided at the connecting portion between the air introducing hole and the passage. Characteristic vacuum valve control device.