JPH0316947Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is installed at the inlet of a branch sewer pipe connected to the main sewer pipe to prevent backflow of sewage gas containing bad smells generated from the main sewer pipe. This relates to a device for

(Prior art and its problems) Because wastewater containing excrement and urine flows through the main sewer pipe, a large amount of foul-smelling sewage gas is generated. However, branch sewer pipes are usually not provided with means to prevent backflow of sewage gas. As a result, sewage gas with a foul odor flows back from the main sewer pipe to the branch sewer pipe, and flows out from the manholes of the branch sewer pipe and the outlets of individual drain pipes, creating an intolerable situation for residents and passersby. Often.

(Means for solving the problem) Therefore, the sewage gas backflow prevention device of this invention has a connecting tube connected to the branch sewer pipe inlet connected to the main sewer pipe, and a support tube connected to the tip of the connecting tube. , and an opening/closing lid that is attached to the tip of the support tube to open and close the support tube.The tip of the connection tube and the rear end of the support tube are hinged so that the connection angle of the support tube to the branch sewer pipe can be adjusted. The opening/closing lid is made up of an upper door that can be opened and closed, and a lower door that can be opened and closed below the upper door.

By attaching this device to the inlet of a branch sewer pipe, sewage gas generated in the main sewer pipe can be
The purpose is to prevent backflow from branch sewer pipes.

This invention will be explained in detail below based on illustrated embodiments.

(Configuration of Example) This invention is composed of a connecting tube, a supporting tube, and an opening/closing lid.

Reference numeral 1 denotes a connecting tube that is inserted into the inlet of a branch sewer pipe that descends obliquely to be connected to the main sewer pipe, and has a connecting protrusion 2 having a bolt hole penetrated at its tip. As will be described later, the entire outer periphery of the connecting tube 1 is provided with irregularities such as, for example, square-shaped protrusions, so as to fill the gap between the injection port and the connecting tube to facilitate fixing the two.

Reference numeral 3 denotes a support tube, the inner diameter of which is slightly larger than the outer diameter of the support tube 1, and has a flange 4 at its front end. 5 is a connecting protrusion, through which a bolt hole is provided. The front portion of this support tube is slightly bent.

The connecting tube 1 and the supporting tube 3 are connected by inserting the front end of the connecting tube 1 into the rear end of the supporting tube and connecting them via a hinge 6 at the lower end of both tubes. The bolts 7 and nuts inserted into the cylinders 5 connect the cylinders 1 and 3 so that the mounting angle of the cylinders 1 and 3 can be adjusted.

8 is an opening/closing lid, which includes a fixed part 9, an upper door 10, and a lower door 11.
It is composed of.

The fixing part 9 is a part that fixes the opening/closing lid 8 to the flange 4 at the front end of the support tube 3, and is provided at the top of the opening/closing lid 9, and has a bolt hole penetrated at a position opposite to a bolt hole penetrated through the flange 4. Insert the bolt 12 and tighten the nut to fix it.

The upper door 10 is a part that opens and closes the central part of the opening/closing lid 8, and has a hinge 1 that connects the lower end of the fixed part 9 and the upper end of the upper lid.
3, it is attached to the fixed part. The lower door 11 is a part that opens and closes the lower part of the opening/closing lid 8, and has a hinge 1 that connects the lower end of the upper door 10 and the upper end of the lower door 11.
4, it is attached to the upper door so that it can be opened and closed.

The front end of the support tube is formed so that when the opening/closing lid is closed, the lower door 11 has an almost vertical inclination, and the upper door 10 has a gentler inclination than the lower door.

The above connection tube 1 and support tube 3 are made of cast steel,
The opening/closing lid 8 is made of thick synthetic resin.

In addition, branch sewer pipes may be connected vertically to the main sewer pipe. In this case, the support cylinder 3 is bent at a substantially right angle so that the upper door 10 and the lower door 11 when the lid 8 is closed have the same slope as in the above embodiment.

Also, depending on the amount of drainage and flow rate, weights can be attached to the upper and lower lids.

(Function) Branch sewer pipe 16 connected to main sewer pipe 15
To attach this device to the injection port, insert the connecting tube 1 up to the vicinity of the hinge 6, and fill the gap between the two with mortar or the like to fix it. Since the outer periphery of the connecting cylinder is provided with irregularities such as square-shaped protrusions, the two can be securely fixed. In addition, when fixing the support tube 3 so that the upper door 10 and the lower door 11 of the opening/closing lid 8 are tilted as described above, the support tube and the connection tube 1 are connected to the hinge 6.
and a bolt 7 that fixes both, so that the two tubes can be connected and fixed by easily adjusting the angle of the connecting tube 1 while looking at, for example, a level (not shown) attached to the support tube.

In normal times when the amount of water discharged is small, the lower door 11, which is connected to the upper door 10 by the hinge 14 and closes the opening/closing lid 8 under its own weight with a nearly vertical slope, opens slightly with a small amount of water to drain water. . Of course, the upper door remains closed. Therefore, the sewage gas in the main sewage pipe 15 does not flow through the branch line because the lower door opens only slightly depending on the flow rate, and there is also negative pressure generated because the sewage in the main sewage pipe flows at a considerable speed. Does not flow back into the sewer pipe 16.

When water rises due to rain, etc., the branch sewer pipe 16
The upper door, which had been closed due to its own weight, will open in response to the flow of water. In this case, the sewage in the main sewer pipe flows even faster, so the negative pressure in the main sewer pipe becomes even greater, and it is possible to prevent the backflow of sewage gas into the branch sewer pipe.

(Effect) By dividing the opening/closing lid into an upper door and a lower door,
Since the lid is always slightly opened depending on the amount of drainage, backflow of sewage gas can be prevented.

In addition, since the connecting tube can be attached to the support tube using a hinge so that the angle can be adjusted, the angle of the support tube can be adjusted to optimize the angle of the opening/closing lid depending on the installation angle of the branch sewer pipe to the main sewer pipe. can.

Therefore, if this device is attached to the inlet of the branch sewer pipe into the main sewer pipe, there is no need to take measures to prevent sewage gas for each drain pipe connected to the branch sewer pipe. Of course, it may be attached to each drain pipe connected to a branch sewer pipe.

[Brief explanation of the drawing]

FIG. 1 is a side view of the entire device, and FIG. 2 is a front view of the opening/closing lid. FIG. 3 is a side view showing the device attached to a branch sewer pipe. 1... Connection tube, 3... Support tube, 6... Hinge, 7
...Bolt, 8...Opening/closing lid, 10...Top door, 11
...lower door, 13...hinge, 14...hinge, 15...
...Main sewer pipe, 16... Branch sewer pipe.

Claims (1)

[Scope of utility model registration request] It consists of a connecting tube connected to a branch sewer pipe inlet connected to the main sewer pipe, a support tube connected to the tip of the connecting tube, and an opening/closing lid attached to the tip of the support tube to open and close the support tube. , connecting the connecting tube tip and the support tube rear end via a hinge so that the connection angle of the support tube to the branch sewer pipe can be adjusted;
A sewage gas backflow prevention device in which the opening/closing lid is formed by an upper door that can be opened and closed, and a lower door that can be opened and closed below the upper door.