JPH05187056A - Device for removing foreign matter of vacuum valve - Google Patents

Abstract

PURPOSE:To automatically remove foreign matter caught round the valve shaft of a vacuum valve in a sewage pit in a vacuum sewage system. CONSTITUTION:A water feed port 1 and an auxiliary suction pipe 3 which are provided with NC motor-operated open/close valves 2, 4 respectively each having a motor M are provided in a sewage pit 12 and the pipe 3 is connected to a valve casing corresponding to the upper end of a valve shaft 5 of a vacuum valve 13. When optical sensors 21, 22 for detecting abnormality in shutting off of valve detect abnormality in shutting off, the valves 2, 4 are opened to permit water W to be discharged from the top of the valve shaft 5, removing thereby the foreign matter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum valve foreign matter removing device used for sewage in a vacuum sewer system.

[0002]

2. Description of the Related Art FIG. 3 shows a schematic diagram of an example of a known vacuum type sewer system of this type for collecting sewage from a large number of houses and facilities. 10 is a plurality of houses, 11 is a drain pipe, 12
Is a sewage system equipped with a vacuum valve 13, 14 is a vacuum sewage pipe, 15 is a lift unit provided in the middle of the vacuum sewage pipe 14, 16 is a vacuum station (vacuum pump station), and a vacuum pump 17 is installed inside. Water tank 18 and pressure pump 19
And so on. 20 is connected to a public sewer trunk line and a sewage treatment plant.

FIG. 4 is a schematic explanatory view of the structure of an example of a sewage tank 12 with a vacuum valve 13. 13a is a vacuum valve 1
3 is a controller, 13b is a water level detection pipe, and 14a is a suction pipe for the accumulated sewage D. Reference numeral 21 denotes an atmospheric pressure introducing pipe.

Waste water D discharged from each home is drained by a drain pipe 1.
When the water level of the accumulated sewage D rises through 1 to the sewage basin 12, the air in the water level detection pipe 13b is compressed and the controller 13a is actuated, the internal valve is opened by the force of vacuum, and the accumulation Sewage D is sucked from the suction pipe 14a to the vacuum wastewater pipe 1
4 is sucked. The valve, once opened, is configured to automatically close after the level of the sewage basin 12 has dropped.

[0005]

However, in reality, various foreign matters are contained in the wastewater D, which is caught between the valve and the valve seat when the vacuum valve 13 is opened and closed, and is completely closed when the vacuum valve 13 is closed. Failures that cannot be closed may occur. For this reason, there is a possibility that the degree of vacuum in the vacuum sewage pipe line 14 that should always maintain a degree of vacuum equal to or higher than a predetermined value is lowered, and the sewage may be conveyed.

In order to promptly deal with the occurrence of this abnormal state, the shutoff of the vacuum valve 13, the detection of the vacuum leak, the foreign matter removing device, and the like are disclosed in Japanese Patent Application Laid-Open No. 3-43527 and the same applicant as the present applicant. It is disclosed in Japanese Patent Laid-Open No. 3-298974.

However, all of these proposals are generally directed to the phenomenon that the foreign matter between the valve body and the valve seat is most likely to be caught, and for example, the valve shaft (stem).
If entanglement with the vacuum valve occurs, it is extremely difficult to remove it automatically, and there is no method to output the abnormal alarm and manually replace the vacuum valve 13. Therefore, a lot of trouble and down time are required. Was needed.

The present invention has been made in view of the above situation, and an abnormality is caused not only when the foreign matter is caught in the vacuum valve but not only between the valve body and the valve seat, but also when it is entangled with the valve shaft. It is intended to provide a means for detecting and automatically removing the foreign matter.

[0009]

For this reason, in the present invention, in the wastewater with vacuum valve of the vacuum sewer system, the tap water supply means and the auxiliary suction pipe each equipped with an electric on-off valve are arranged. The auxiliary suction pipe is connected to the valve shaft upper end corresponding portion of the main body casing of the vacuum valve, and when the shutoff abnormality is detected by the valve opening abnormality detecting means provided in the vacuum valve, the electric valves are opened. The object is to be achieved by configuring the foreign matter removing device for the vacuum valve to have the control means.

[0010]

With the above-described structure of the present invention, when foreign matter is caught in the vacuum valve or entanglement with the valve shaft occurs, a valve shutoff abnormality is detected and a predetermined amount of clean water is automatically supplied to the outside. Can be supplied and discharged from the upper portion of the valve shaft to remove foreign matters by flowing down.

[0011]

EXAMPLES The present invention will be described below based on examples. FIG. 1 is a schematic configuration diagram (corresponding to FIG. 4) of an embodiment of the sewage system according to the present invention, and FIG. 2 is an enlarged vertical sectional view of the vacuum valve.

(Constitution) The feature of this embodiment is that the vacuum valve 1
Provide a clean water inlet at the position corresponding to the top of the valve shaft of the main body casing of 3, and suck up a large amount of clean water supplied to the wastewater tank when an abnormality such as foreign matter entanglement is detected and inject it to remove it. It has been configured to.

In FIG. 1, reference numeral 1 is an external clean water W supply port provided on the side wall of the sewage tank 12, and 2 is an NC (normally closed) electric on-off valve by a motor M for supplying the clean water W supplied. The sewage can be discharged into the basin 12. Reference numeral 3 denotes an auxiliary suction pipe for removing foreign matter, which is guided into the vacuum valve 13 via an NC electric opening / closing valve 4 by a motor M.

In FIG. 2, reference numeral 3a shows a sub-introduction port for connecting the sub-suction pipe 3 opened toward the upper end corresponding portion of the valve shaft 5 of the main body casing of the conventionally known vacuum valve 13. In the figure, 6 is a valve element, 7 is a valve seat, and 8 and 9
Is a diaphragm 8 fixed to the upper end of the valve shaft 5.
And a diaphragm cup for supporting the same. The vacuum valve 13 is provided with a pair of light emitting / receiving elements 21/22 of an optical sensor as a valve opening abnormality detecting means for confirming the completely closed state of the valve 6 and the like. Abnormality detection such as foreign matter biting or entanglement, operation command,
The alarm output and the motor M control of each of the on-off valves 2 and 4 are configured so that predetermined control is performed via a central processing unit (not shown).

(Operation) By the valve opening abnormality detecting means,
When an abnormality such as a foreign matter being caught in the valve seat 7 or entangled with the valve shaft 5 is detected, the motor M of the opening / closing valve 2 of the clean water supply port 1 is first operated by a predetermined program, and a relatively large amount of external power is supplied from the outside. The tap water W is discharged into the sewage tank 12, then the motor M of the on-off valve 4 is operated to open the auxiliary suction pipe 3, and when the sewage is sucked from the suction pipe 14a of the vacuum sewage pipe 14, the auxiliary suction pipe 3 mainly sucks the discharged water W and ejects it from the sub-inlet 3a of the vacuum valve 13 to the upper part of the valve shaft 5 to cause foreign matter to flow down. When the abnormal valve closing phenomenon disappears, the original state is restored. To do.

The constructions of the sewage tank 12, the vacuum valve 13 and the like in the present invention are not limited to those shown in the drawings, and the principle of the present invention can be applied to these various modifications. Of course.

[0017]

As described above, according to the present invention, when an abnormal valve closing due to a foreign object of the vacuum valve is detected in each wastewater tank of this type of vacuum sewer system, the tap water is automatically supplied from the outside. Since the foreign matter is introduced to remove the foreign matter from the upper portion of the valve shaft, it is possible to effectively deal with the entanglement of the foreign matter with the valve shaft, which has been difficult to solve conventionally.

[Brief description of drawings]

[Fig. 1] Schematic diagram of the configuration of an embodiment of sewage masu

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

FIG. 3 is a schematic diagram of an example of a conventional vacuum sewer system.

[Figure 4] Figure 1 equivalent to one example of the sewage system

[Explanation of symbols]

1 Clean water supply port 2, 4 Electric opening / closing valve 3 Sub suction pipe 3a Sub introduction port 5 Valve shaft 12 Waste water 13 Vacuum valve 21/22 Light emitting / light receiving element (optical sensor for detecting valve opening abnormality)

Claims (1)

[Claims] 1. A clean water supply means and an auxiliary suction pipe, each of which is equipped with an electric opening / closing valve, is disposed in a sewage tank with a vacuum valve of a vacuum type sewer system, and the auxiliary suction pipe is connected to a main casing of the vacuum valve. A vacuum valve which is connected to the upper end corresponding portion of the valve shaft and which has control means for opening each of the electric valves when a closing abnormality is detected by a valve opening abnormality detecting means provided in the vacuum valve. Foreign matter removal device.