JP2805127B2 - Control device of vacuum valve in vacuum sewer system - 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 in a vacuum sewer system.

[0002]

2. Description of the Related Art A vacuum type sewer system stores sewage from each household and sends the sewage to the vacuum station through a vacuum sewage pipe in a mixed state with ordinary air by a vacuum generated by a vacuum station. A vacuum valve is provided between the sewage suction pipe for sucking sewage in a sewage mass storing sewage and the vacuum sewage pipe in order to suck and stop sewage by a vacuum sewage pipe. And a control device for controlling the operation of the vacuum valve. As such a control device, for example, a controller that operates by a float that detects a water level in a sewage mass is known.Such a controller opens a vacuum valve when the water level in the sewage mass is equal to or higher than a predetermined water level, and It is configured to close the vacuum valve when the water level falls below a predetermined level.

[0003]

However, in the controller that opens and closes the vacuum valve based on only the water level as described above, the sewage suction pipe extends downward to near the bottom of the sewage mass to suck grease and the like on the sewage surface. If the water level drops to some extent, the float will stick to the bottom of the sewage mass and cannot follow the water level any more. Even if the sewage suction pipe is extended downward to near the bottom of the sewage mass, the vacuum valve will close before the water level reaches the lower end of the sewage suction pipe, and grease etc. There was a problem that it remained at the bottom of the sewage cell.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention stores sewage from each household and sends the sewage to the vacuum station via a vacuum sewer pipe by means of a vacuum generated by a vacuum station. In a vacuum sewer system, a control device for controlling a vacuum valve provided between a sewage suction pipe for sucking sewage in a sewage mass storing sewage and the vacuum sewage pipe, wherein the sewage mass is An opening instruction controller for opening the vacuum valve when the water level in the water exceeds a predetermined upper limit water level, and when the water level in the sewage mass falls below the sewage suction pipe and the negative pressure in the vacuum sewer decreases, A closing instruction controller for detecting the decrease in the negative pressure and closing the vacuum valve.

[0005]

According to the vacuum valve control device of the vacuum type sewer system of the present invention, the start of suction of sewage is performed by the opening instruction controller based on the water level in the sewage mass, but the stop of suction reduces the negative pressure in the vacuum sewage pipe. This is performed by the closing instruction controller, and the suction is stopped only when the water level in the sewage mass falls below the sewage suction pipe.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an outline of a vacuum type sewer system employing a simultaneous gas-liquid suction system. 2, sewage from the toilet 3, the kitchen 4, etc., is guided to the vacuum valve unit 6 via the natural downflow pipe 5, and the vacuum valve unit 6
Is temporarily stored.

[0007] The vacuum valve unit 6 is connected to a vacuum station 8 via a vacuum sewer pipe 7, and the sewage stored in the vacuum valve unit 6 is air-purified by the vacuum generated in the vacuum station 8 as described later. In a mixed state with the above, the mixture is guided to a water collecting tank 9 of a vacuum station 8 through a vacuum sewer pipe 7. The upper part of the water collecting tank 9 is connected to a vacuum pump 10 and the lower part thereof is connected to a pressure pump 11. The wastewater guided to the water collecting tank 9 is discharged by the pressure pump 11 into a sewage treatment facility (not shown) or another large sewer pipe. Sent to

Next, the structure of the vacuum valve unit 6 will be described with reference to FIG. 2. Inside the vacuum valve unit 6, the upper end is connected to a vacuum sewer pipe 7 via a vacuum valve 12, and the lower end is vacuum. A suction pipe 13 which is open at a position close to the bottom of the valve unit 6 in the sewage mass is arranged. This suction pipe 13
An intake pipe 14 is branched and connected in an L-shape at a position slightly above the lower end thereof, and the upper end of the intake pipe 14 is opened at a position above the surface of the sewage water W.

Next, the structure of the vacuum valve 12 will be described with reference to FIG.
The valve body 16 is capable of opening and closing a communication portion 17 between the vacuum sewer pipe 7 and the suction pipe 13. The inside of the valve body 15 is divided by the diaphragm 18 and the partition wall 19 into a variable pressure chamber 20, an atmospheric pressure chamber 21, and a communication chamber 22 with the vacuum sewer pipe 7, and the variable pressure chamber 20 will be described later through a connection port 20a. The atmospheric pressure chamber 21 is connected to the pipe 25 and the communication port 2
It communicates with the atmosphere via 1b. The upper end of the valve body 16 is fixed to the diaphragm 18, and a spring 23 that constantly biases the valve body 16 in the direction of closing the communication portion 17 via the diaphragm 18 is housed in the variable pressure chamber 20.

The opening and closing of the vacuum valve 12 is controlled by a control device 24. The control device 24 is connected to the variable pressure chamber 20 of the vacuum valve 12 via a pipe 25, and connects a pipe 26 to the vacuum sewer pipe 7. Open instruction controller 27 connected via a pipe, a close instruction controller 29 provided in the middle of a connection pipe 28 between the pipes 25 and 26, and a pipe 25 on the open instruction controller 27 side of the connection section with the connection pipe 28. And a check valve 30 provided in the middle of
The configuration of each of these components will be described below.

As shown in FIGS. 2 and 4, the opening instruction controller 27 includes a ball float 31 and a switching valve 32 which is operated based on the vertical movement of the ball float 31. The switching valve 32 has a communication port 33 with the atmosphere, a connection port 34 with the pipe 25, and a connection port 35 with the pipe 26, and a valve body 36 connected to the upper end of the ball float 31 inside. Are located. Here, when the water level in the mass is below the level H shown in FIG.
The communication part 37 between the fourth side and the connection port 35 side is closed to connect the pipe 25 to the atmosphere side, and when the level exceeds H, the communication port 33 with the atmosphere is closed to connect the pipe 25 to the pipe 26. ing.

As shown in FIG. 5, the closing instruction controller 29 has a piping 2 through a diaphragm 38 and a partition wall 39.
It is divided into a communication chamber 40 with the 6 side, an atmospheric pressure chamber 41, and a communication chamber 42 with the pipe 25 side. Communication rooms 40 and 42
Are provided with connection ports 43 and 44 for the pipes 26 and 25, respectively, and the atmospheric pressure chamber 41 is provided with a communication port 45 for communicating with the atmosphere. The partition 39 has an atmospheric pressure chamber 41 and a communication chamber 42.
A communication hole 46 is provided, and a valve body 47 having an upper end fixed to the diaphragm 38 can open and close the communication hole 46. A spring 48 for urging the valve body 47 in the direction in which the communication hole 46 opens is disposed inside the communication chamber 40.

As shown in FIG. 6, the check valve 30 has a valve body 50 urged in the closing direction by a spring 49 and normally closes the communication hole 51. This is to prevent the flow of the fluid to the vacuum valve 12 side.

Next, the operation of the above embodiment will be described.
First, when the water level in the mass is lower than the water level H shown in FIG. 2, the valve body 36 of the open instruction controller 27 closes the communication portion 37 on the connection port 34 side and the connection port 35 side as shown in FIG. Is connected to the atmosphere side. Therefore, the atmospheric pressure is introduced into the variable pressure chamber 20 of the vacuum valve 12, the valve body 16 closes the communication portion 17 by the urging force of the spring 23, as shown in FIG. 3, and the vacuum is introduced into the suction pipe 13. It is not sucked. At this time, the closing instruction controller 2
Since the atmospheric pressure from the pipe 25 is led to the communication chamber 42 of No. 9 and the vacuum from the pipe 26 (from the vacuum sewer pipe 7) is always guided to the communication chamber 40, as shown in FIG. The valve body 47 rises against the urging force of the spring 48 and closes the communication hole 46.

Next, when the water level exceeds H, the valve element 36 of the opening instruction controller 27 opens the communication portion 37 between the connection port 34 and the connection port 35 as shown in FIG. The pipe 25 is closed to communicate with the pipe 26. Therefore, the vacuum in the pipe 26 is guided from the pipe 25 to the variable pressure chamber 20 of the vacuum valve 12 via the check valve 30, and the valve body 16 opens the communication portion 17 against the urging force of the spring 23, Vacuum is guided to the suction pipe 13 to suck the sewage. At this time, the vacuum from the pipe 25 is also introduced into the communication chamber 42 of the closing instruction controller 29, but the valve body 47 is still maintained in the state shown in FIG. 5 due to the pressure difference between the atmospheric pressure chamber 41 and the communication chamber 40. Things.

As the suction of the sewage proceeds, the valve body 36 of the opening instruction controller 27 also moves down. As a result, the pipe 25 communicates with the atmosphere, but a check valve 30 is provided in the middle of the pipe 25. Therefore, the vacuum valve 12 is still kept open. When the suction of the sewage proceeds further and the water level falls below the lower end of the suction pipe 13, the sewage is sucked together with the air, and the negative pressure of the vacuum sewer pipe 7 decreases.
Therefore, the negative pressure in the pipe 26 decreases, and the negative pressure in the variable pressure chamber 40 of the closing instruction controller 29 also decreases accordingly. When the negative pressure in the variable pressure chamber 40 decreases in this way, the valve body 47 descends due to the urging force of the spring 48, and the atmospheric pressure chamber 41
And the communication chamber 42 communicate with each other through the communication hole 46.

Therefore, the atmosphere is connected to the pipe 2 through the connection port 44.
8, the pressure in the variable pressure chamber 20 of the vacuum valve 12 becomes atmospheric pressure, and the valve body 16
The pressure is lowered by the urging force of 3, and the communication portion 17 is closed to cut off the supply of the vacuum to the suction pipe 13.

As described above, in the control device 24 of the vacuum valve 12 according to the present embodiment, the start of the suction of the sewage starts at the water level H in the sewage mass.
The suction is stopped by the closing instruction controller 29 based on the decrease in the negative pressure in the vacuum sewer pipe 7, and the lower end of the suction pipe 13 is moved as far as possible. By positioning it close to the bottom of the sewage mass, grease floating on the surface of the sewage can be sucked out, and the vacuum valve 12 closes as soon as the negative pressure decreases. Can be prevented.

[0019]

According to the vacuum valve control device of the vacuum type sewer system of the present invention, the suction stop of the sewage is performed by the closing instruction controller based on the decrease of the negative pressure in the vacuum sewer pipe. The suction is stopped only when the water level is below the sewage suction pipe,
By positioning the lower end of the suction pipe as close to the bottom of the sewage as possible, grease floating on the sewage surface can be sucked without leaving the vacuum valve as soon as the negative pressure decreases. This has the advantage that it is possible to prevent inhalation of air more than necessary.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a vacuum type sewer system using a vacuum valve unit according to one embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the vacuum valve unit of FIG.

FIG. 3 is a sectional view of the vacuum valve of FIG. 2;

FIG. 4 is a sectional view of a main part of the opening instruction controller of FIG. 2;

FIG. 5 is a sectional view of the closing instruction controller of FIG. 2;

FIG. 6 is a sectional view of the check valve of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 General house 6 Vacuum valve unit 7 Vacuum sewer pipe 8 Vacuum station 12 Vacuum valve 13 Suction pipe 24 Controller 27 Open instruction controller 29 Close instruction controller W Sewage

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E03F 5/22 E03F 7/00

Claims (1)

(57) [Claims] 1. A vacuum sewer system for storing sewage from each household and sending the sewage to the vacuum station via a vacuum sewer pipe by a vacuum generated by a vacuum station. A control device for controlling a vacuum valve provided between a sewage suction pipe for sucking sewage and the vacuum sewer pipe, wherein when a water level in the sewage mass exceeds a predetermined upper limit water level, the vacuum is removed. An open instruction controller for opening the valve, and when the water level in the sewage mass falls below the sewage suction pipe and the negative pressure in the vacuum sewer decreases, the pressure decrease is detected and the vacuum valve is closed. A control device for a vacuum valve in a vacuum type sewer system, comprising a closing instruction controller.