JPH05187054A - Device for removing foreign matter in water level detecting tube - Google Patents

Abstract

PURPOSE:To detect that a water level detecting tube for establishing a predetermined pressure for controlling the action of a vacuum valve has been blocked with foreign matters in a waste water pit with vacuum valve for use in a vacuum sewerage system to automatically remove such foreign matters. CONSTITUTION:A liquid level sensor 1 for detecting a predetermined liquid level of waste water D collected in a waste water pit 12 is provided and a pressure sensor 2 is provided at the upper part of a water level detecting tube 13b. When the detected values of both sensors 1, 2 do not show a predetermined corresponding relationship, compressed air 3 is introduced into a connecting pipe 13c between the tube 13b and a vacuum valve controller 13a by means of CPU3 from an outside source to remove 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 device for removing foreign matter clogged in a water level detecting pipe in a dirty water tank with a vacuum valve of 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 controller, 13b is a water level detection pipe (sensor pipe), 1
Reference numeral 4a is a suction pipe for the collected dirty water 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 mist 12, the air in the water level detection pipe 13b is compressed, the controller 13a operates via the connection pipe 13c, and the internal force is generated by the vacuum force. The valve opens and the accumulated waste water D is sucked into the vacuum waste water pipe 14 from the suction pipe 14a. The valve, once opened, is configured to automatically close after the level of the sewage basin 12 has dropped.

[0005]

However, in practice, the waste D discharged from each house usually contains various foreign substances, and the level of the waste water accumulated in the waste water basin 12 is detected. There was a case where the water level detection pipe 13b for this purpose was clogged, the pressure inside the pipe did not rise, and it became impossible to operate the vacuum valve 13 to suck into the vacuum dirty water pipe 14.

When such an abnormality occurs, the vacuum transfer is stopped and the liquid level of the sewage D in the sewage basin 12 rises excessively, causing various problems such as backflow to the drainage pipe 11. Each time, it was necessary to manually remove the foreign matter, which required man-hours / hours, and in the meantime, it was inconvenient for each related house. The present invention has been made in view of the conventional situation as described above, and an object thereof is to provide means for automatically detecting foreign matter by detecting an abnormality due to clogging of the water level detection pipe 13b.

[0007]

Therefore, in the present invention, wastewater discharged from a plurality of houses is collected in a wastewater tank with a vacuum valve, and the wastewater is sucked into a vacuum wastewater pipe through the vacuum valve. In a vacuum type sewer system that conveys to a vacuum station, in order to obtain a liquid level detection means for detecting a predetermined liquid level of the waste water accumulated in the waste water and a predetermined pressure for controlling the operation of the vacuum valve. And a pressure detecting means respectively above the water level detecting pipe, and when the detected predetermined liquid level value and the detected pressure value do not show a predetermined correspondence, the water level detecting pipe is connected to the vacuum valve. It is intended to achieve the above-mentioned object by providing a control means for controlling to introduce compressed air into the connecting pipe between the controllers.

[0008]

With the above-described structure of the present invention, when the water level detecting pipe of a certain sewage mist is clogged with foreign matter, the detected sewage liquid level and the pressure detecting value of the water level detecting pipe do not show a predetermined correspondence. When it is judged as an abnormality due to foreign matter clogging, a predetermined control means automatically ejects compressed air from the outside into the connection path between the water level detection tube and the vacuum valve controller, and the pressure causes the foreign matter in the water level detection tube to be removed. Since it is extruded and removed, it is not necessary to suspend the transportation for a long time as in the conventional case.

[0009]

EXAMPLES The present invention will be described below based on examples. FIG. 1 shows a schematic block diagram corresponding to FIG. 4 of an embodiment of the sewage tank according to the present invention, and FIG. 2 shows a functional block diagram thereof.

(Structure) This embodiment is characterized in that, as shown in FIG. 1, a predetermined liquid level of accumulated wastewater D, such as a float type, an optical type, or an ultrasonic type, on the inner wall of the wastewater tank 12. The liquid level sensor 1 for detecting the liquid level is provided, and the pressure sensor 2 and the compressed air introduction pipe 3a are provided in the connection pipe 13c between the water level detection pipe 13b and the controller 13a of the vacuum valve 13. The output of the surface sensor 1 and the output of the pressure sensor 2 are connected to a control device (not shown) (such as the CPU 4), and the compressed air source 3 (such as an opening / closing valve of a compressor or a compressed air tank) is controlled by the CPU 4. It is connected so that it can issue orders.

(Operation) Next, the operation will be described with reference to FIGS. When the dirty water D accumulates in the dirty water tank 12 and reaches a predetermined vacuum valve 13 working liquid level, the liquid level sensor 1 detects this. In the normal case, the corresponding pressure increase is detected by the pressure sensor 2, and this pressure is transmitted to the controller 13a via the connecting pipe 13c to cause the vacuum valve 13 to perform a predetermined operation. On the other hand, during this time, if the water level detection tube 13b is clogged with foreign matter, the controller 13
a does not reach the predetermined pressure value. If the output values of the liquid level sensor 1 and the pressure sensor 2 do not show a predetermined correspondence,
The CPU 4 (not shown) judges that this is a clogging, and automatically instructs the compressed air source 3 to introduce the compressed air to cause the water level detection pipe 13b.
It is ejected to the upper part, and the foreign matter is discharged to the outside by this pressure. When this returns to the normal state, the introduction of compressed air is shut off and the vacuum valve 13 performs a predetermined operation.
Therefore, it is not necessary to spend a long time for repair.

[0012]

As described above, according to the present invention, when the water level detecting pipe in the sewage system of this type of vacuum sewer system is clogged with foreign matter in the sewage, the abnormality is detected and automatically detected. Since the foreign matter is released by compressed air, it is possible to eliminate the repair man-hours, downtime, etc., which are conventionally required.

[Brief description of drawings]

[Figure 1] Schematic configuration diagram of an example of sewage masu

FIG. 2 is a block diagram of its functional configuration.

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

[Fig. 4] Schematic diagram of an example of conventional sewage masu

[Explanation of symbols]

 1 Liquid level sensor 2 Pressure sensor 3 Compressed air source 4 CPU 12 Sewage water 13 Vacuum valve 13a Controller 13b Water level detection pipe 13c Connection pipe 14 Vacuum wastewater pipe D Sewage

Claims (1)

[Claims] 1. A vacuum sewer system for collecting sewage discharged from a plurality of houses into a sewage tank with a vacuum valve, sucking the sewage into a vacuum sewage pipe through the vacuum valve, and transporting the sewage to a vacuum station, A liquid level detecting means for detecting a predetermined liquid level of the sewage collected in the sewage tank, and a pressure detecting means at the upper part of the water level detecting pipe for obtaining a predetermined pressure for controlling the operation of the vacuum valve. With each provided, the detected predetermined liquid level value,
A control means is provided for controlling the water level detecting pipe so as to introduce compressed air into the connecting pipe between the controllers of the vacuum valve when the detected pressure value does not show a predetermined correspondence. Water level detection tube foreign matter removal device characterized by: