JPH0790916A - Breather-pipe with soil water inlet-prevention mechanism - Google Patents

Abstract

PURPOSE:To eliminate the necessity of installing a breather-pipe on the ground by opening the breather-pipe in a soil chamber and, at the same time, providing a closing valve closing the breather-pipe by pressure generated in the case the water level in the chamber is abnormally raised. CONSTITUTION:Air supplied to the inside of a soil chamber from a soil water inlet pipe 2 is supplied to a vacuum valve from an air intake 7a through a breather-pipe 7. In the case the water level in the soil water chamber 1 is raised, the vacuum valve 4 is opened by a control mechanism, and the soil water is absorbed in a vacuum sewer 3 and is discharged. In addition, in the case the water level in the chamber 1 is abnormally raised, air of a water level detection pipe 13 is strongly compressed by the water level, a diaphragm 11 gets over pushing force of a compressed coil spring and is displaced upward, and a valve body 10 is pushed up to close a pipe line of the breather-pipe 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breather pipe, and more particularly to a breather pipe with a sewage inflow prevention mechanism, which is suitable for use in a vacuum sewer system for transporting sewage such as domestic waste water in a vacuum.

[0002]

2. Description of the Related Art Vacuum sewer systems have begun to attract attention in recent years because maintenance of pipes tends to be relatively expensive in conventional free-flow sewer systems. The vacuum sewer system consists of three parts: a sewage system with a vacuum valve, a vacuum sewer pipe and a vacuum pump station.

Sewage discharged from a home is collected in a sewage tank with a vacuum valve under natural flow, and when the liquid level in the sewage tank rises, the control mechanism of the vacuum valve detects this and the valve opens, collecting in the sewage tank. The dirty water is sucked into the vacuum sewer pipe. The vacuum valve continues to open for a certain period of time after sucking the dirty water, during which air is sucked. The sewage in the pipe is pushed by the expanding air to form a multiphase flow and is carried to the vacuum pumping station. When sewage is collected in the water collection tank to some extent, it is sent to the sewage treatment plant or the public sewer main line by the sewage pump.

FIG. 4 shows a conventional sewage tank 20 in which a suction pipe 21 is installed. Suction pipe 21
The lower end of the is opened into the sewage tank 20, and the suction pipe 21 is connected to a vacuum sewer pipe 23 via a vacuum valve 22.
Further, a sensor pipe 24 is installed in the sewage tank 20, and the sensor pipe 24 is connected to the control device of the vacuum valve.
The vacuum valve 22 is operated by detecting the water level in the dirty water tank 20. Note that reference numeral 26 is a sewage inflow pipe.

[0005]

Since the vacuum valve 22 operates by the pressure difference between the atmosphere and the vacuum, the atmosphere must be introduced into the vacuum valve 22 from the outside of the sewage tank 20.
Therefore, as shown in FIG. 4, a breather pipe 25 protruding above the sewage masu 20 is installed. Since the breather pipe 25 is installed so as to project to the ground and open to the ground, it is difficult to secure the installation place and there is a problem that it may be broken due to artificial causes such as mischief. there were.

On the other hand, when the breather pipe is opened in the sewage tank, when the water level in the sewage tank rises abnormally, the sewage flows into the vacuum valve and its control device, and the vacuum valve becomes inoperable. There was a problem.

The present invention has been made in view of the above circumstances, and it is not necessary to install a breather pipe on the ground, and even if the water level in the sewage mist rises abnormally, the sewage will remain in the vacuum valve and its control device. An object of the present invention is to provide a breather pipe with a sewage inflow prevention mechanism that does not flow in.

[0008]

In order to achieve the above-mentioned object, a breather pipe with a sewage inflow prevention mechanism of the present invention is a breather pipe for introducing air into a vacuum valve installed in a sewage mast. The breather pipe is opened in the sewage tank, and a shut-off valve is provided to close the breather tube by the pressure generated by the liquid level in the sewage tank when the liquid level in the sewage tank rises abnormally. It is what

[0009]

According to the present invention having the above-described structure, since the breather pipe for introducing the atmosphere into the vacuum valve is opened in the dirty water, it is not necessary to install the breather pipe protruding above the ground. Moreover, even if the liquid level in the wastewater mist rises abnormally, the breather pipe can be closed by the pressure generated by the liquid level in the wastewater mast, so that the wastewater will not flow into the vacuum valve and its control device. Can be prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the breather pipe with a sewage inflow prevention mechanism according to the present invention will be described below with reference to FIGS.
FIG. 1 is a diagram showing the overall structure of a sewage muffler equipped with a breather pipe with a sewage inflow prevention mechanism of the present invention.
Reference numeral 1 is a sewage tank, and the sewage tank 1 has a sewage inflow pipe 2
Is connected, and the sewage discharged from homes is collected in the sewage basin 1 under natural flow.

A suction pipe 3 is installed in the sewage tank 1, and the suction pipe 3 is connected to a vacuum sewer pipe 5 via a vacuum valve 4. A sensor tube 6 is installed in the dirty water tank 1, and an output part of the sensor tube 6 is connected to a control device of the vacuum valve 4.

A breather pipe 7 is connected to the vacuum valve 4 so that the atmosphere is supplied to the vacuum valve 4. The air intake 7a of the breather pipe 7 is open in the sewage tank 1. Further, the breather pipe 7 is provided with a stop valve 8 for preventing inflow of sewage.

As shown in FIG. 2, the shut-off valve 8 has a casing 9, a valve body 10 for closing the passage of the breather pipe 7, and a diaphragm 11 connected to the valve body 10.
And a compression coil spring 12 that presses the diaphragm 11 downward, and a water level detection pipe 13 that extends downward from the casing 9.

Next, the operation of the breather pipe with the sewage inflow prevention mechanism constructed as described above will be described.

The air to be taken into the vacuum valve 4 is supplied from the wastewater inflow pipe 2 into the wastewater tank 1. And
The air in the sewage masu 1 flows from the air intake 7a to the breather pipe 7
Is supplied to the vacuum valve 4 via.

The water level detection pipe 13 is installed so that, when the wastewater in the wastewater tank 1 is discharged by opening the vacuum valve 4, the lower end is open to the atmosphere, that is, above the residual wastewater level. . When the water level in the dirty water tank 1 becomes abnormally high, the air in the water level detection tube 13 is strongly compressed by the water level, and the diaphragm 11 overcomes the pressing force of the spring 12 and is displaced upward, pushing up the valve body 10 and pushing the breather pipe. Close the line of 7. That is, the pressure generated by the liquid level of the dirty water 1 is applied to the diaphragm 11, and the valve body 1
0 is operated and the breather pipe 7 is closed. Therefore, even if the water level in the sewage tank 1 rises abnormally, the sewage does not flow from the breather pipe 7 into the vacuum valve 4 and its control device.

FIG. 3 is a diagram showing another embodiment of the present invention. 3, constituent elements having the same functions and functions as those of the embodiment shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the sensor pipe 6 for operating the vacuum valve 4 also serves as the water level detection pipe for the shutoff valve 8, and when the water level in the wastewater tank 1 rises abnormally, the sensor pipe 6 It is detected and the stop valve 8 is operated. Other configurations are the same as those of the embodiment shown in FIGS.

[0019]

As described above, according to the present invention, since the breather pipe for introducing the atmosphere into the vacuum valve is opened in the sewage mist, it is not necessary to install the breather pipe protruding above the ground. Therefore, unlike the conventional case, there is no fear of securing a place for installing the breather pipe, and there is no fear of failure due to artificial causes such as mischief.

Further, even if the liquid level in the sewage tank rises abnormally, the breather pipe can be closed by the pressure generated by the liquid level in the sewage tank, so that the sewage flows into the vacuum valve and its control device. Can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a breather pipe with a sewage inflow prevention mechanism according to the present invention.

FIG. 2 is a sectional view showing a detailed structure of a breather pipe with a sewage inflow prevention mechanism according to the present invention.

FIG. 3 is a cross-sectional view showing another embodiment of the breather pipe with a sewage inflow prevention mechanism according to the present invention.

FIG. 4 is a sectional view of a sewage tank equipped with a conventional breather pipe.

[Explanation of symbols]

 1 Sewage water 2 Sewage inflow pipe 3 Suction pipe 4 Vacuum valve 5 Vacuum sewer pipe 6 Sensor pipe 7 Breather pipe 8 Closing valve 9 Casing 10 Valve body 11 Diaphragm 12 Compression coil spring 13 Water level detection pipe

Claims (1)

[Claims] 1. A breather pipe for introducing air into a vacuum valve installed in a sewage mast, the breather pipe being opened into the sewage masu, and when the liquid level in the sewage mast abnormally rises. A breather pipe with a sewage inflow prevention mechanism, comprising a stop valve for closing the breather pipe by a pressure generated by a liquid level in the sewage masu.