JP2000291124A - Strainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strainer for separating foreign matter such as dirt and scum from sewage force-fed to a main soil pipe, to make separated foreign matter flow down to a specified disposal place and draining sewage separated from the foreign matter, to a specified treating water tank from the main soil pipe. SOLUTION: Sewage force-fed to the upper reaches 1A of a main soil pipe 1 is led into a swirling separation chamber 3 from a sewage lead-in passage 4 and transformed into rapid swirling flow. Most of foreign matter such as dirt and scum contained in the swirling flow is carried away together with part of sewage to a foreign matter discharge passage 6 and conveyed to a specified disposal place by a foreign matter conveying pipe 7 and recovered. Sewage swirling in the swirling separation chamber 3 still contains foreign matter. This slight foreign matter is eliminated by a cylindrical inner strainer 5, and the sewage almost rid of foreign matter passes through the inner strainer 5 and is force-fed to the lower reaches 1B of the main soil pipe 1 and drained to a specified treating water tank or the like from an outlet at a lower reaches end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for separating foreign substances such as trash and scum contained in sewage pumped to a sewage main pipe by a sewage pump from the sewage and flowing down the sewage from which the foreign substances are separated. The present invention relates to a strainer that flows out to the sewage main pipe.

[0002]

2. Description of the Related Art Foreign matter such as dust and scum contained in sewage pumped to a sewage main pipe 1 by a sewage pump P shown in FIG. The wastewater collected by the wastewater 2 and the foreign matter collected therefrom is drained from an outlet of the wastewater main pipe 1 to a predetermined treated water tank or the like.

However, the collected foreign matter accumulates in the strainer 2 with time and causes clogging. As a result, the flow of sewage is prevented, and the amount of drainage from the outlet of the sewage main pipe 1 to a predetermined treatment tank is reduced, and an extra load is applied to the sewage pump P to increase power consumption of the pump motor. Occurs.

[0004] Therefore, the strainer 2 is removed from the sewage main pipe 1 to collect foreign matters such as accumulated dust and scum, and the collected foreign matters are transported to a predetermined treatment plant.
A complicated operation of re-attaching the removed strainer 2 to the sewage main pipe 1 is periodically required.

[0005]

That is, in the conventional structure in which a strainer for collecting foreign matter such as dust and scum is detachably attached to the sewage main pipe, the strainer is detached from the sewage main pipe, and is deposited. Collect foreign matter such as garbage and scum, transport the collected foreign matter to a predetermined treatment plant,
There is a drawback that a complicated operation for reattaching the removed strainer to the sewage main pipe is required periodically.

Therefore, the present invention separates foreign matter such as dust and scum from wastewater fed to a wastewater main pipe, causes the separated foreign matter to flow down to a predetermined treatment plant, and removes the separated wastewater. Provided is a strainer that drains water from a sewage main to a predetermined treatment water tank or the like, thereby obviating the need for cumbersome attachment / detachment work, foreign matter collection work, foreign matter transport work, and the like, which are conventionally performed regularly. It is intended to be.

[0007]

In order to achieve the above-mentioned object, a strainer 2 according to the present invention comprises a rotating separation chamber 3 having an axially closed one end and a drainage port 32 at the other axial end. A sewage introduction passage 4 which is provided to be tangent to or close to the tangential line of the swirl separation chamber 3 and introduces sewage into the swirl separation chamber 3, and extends into the swirl separation chamber 3 corresponding to the drain port 32. A cylindrical inner strainer 5 attached by
A foreign matter discharge passage 6 that is provided to be tangent to or close to the tangent to the swirl separation chamber 3 and discharges foreign matter that swirls together with sewage in the swirl separation chamber 3 together with part of the sewage;
The inlet of the sewage introduction passage 4 is connected to the upstream outlet of the sewage main pipe 1, the drain port 32 is connected to the downstream inlet of the sewage main pipe 1, and the outlet of the foreign matter discharge passage 6 is connected to the foreign substance transport pipe. 7 is connected.

According to the present invention, the sewage pumped to the upstream side of the sewage main pipe by the operation of the sewage pump is introduced from the sewage introduction passage into the swirl separation chamber and converted into a fast swirling flow. Most of the foreign matter such as dust and scum contained in the swirling flow is taken away to a foreign matter discharge passage together with a part of the sewage and transported to a predetermined treatment site by a foreign matter transport pipe to be collected.
On the other hand, in the sewage swirling in the swirl separation chamber, a small amount of foreign matter still remains. This slight residual foreign matter is removed by the cylindrical inner strainer. The sewage from which foreign matters are almost completely removed passes through the inner strainer, is pumped from the drain port to the downstream side of the sewage main pipe, and is drained from a downstream end outlet into a predetermined treatment water tank.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. Note that the same or corresponding parts as those of the conventional example are denoted by the same reference numerals and described. FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG.
FIG. 3 is a sectional view taken along line A-B of FIG. 1. In these figures, the strainer 2 includes a swirl separation chamber 3, a sewage introduction passage 4, a cylindrical inner strainer 5, and a foreign matter discharge passage 6.

The revolving separation chamber 3 is cylindrical and has one end in the axial direction removably closed by a face plate 30 and the other end in the axial direction removably closed by a face plate 31.
A drain port 32 is provided through the center of the face plate 31.

The sewage introduction passage 4 is for converting sewage into a swirling flow S in the swirl separation chamber 3, and is formed by a small-diameter pipe bent in a V-shape. It is directed to the tangent line of the swirl separation chamber 3 from below and biased to the side, and is provided in communication with the inside of the swirl separation chamber 3.

The cylindrical inner strainer 5 is formed in a cylindrical shape by punching metal or wire mesh, and extends horizontally from the side of the face plate 31 toward the inside of the revolving separation chamber 3 corresponding to the drain port 32, and has a flange-like shape. The base end portion 5 </ b> A is sandwiched and held between the other end surface of the swing separation chamber 3 and the face plate 31.

The foreign matter discharge passage 6 is for discharging foreign matters such as dust and scum separated from sewage in the swirl separation chamber 3. The foreign matter discharge passage 6 is biased upward toward the other axial end of the swirl separation chamber 3. The swivel separation chamber 3 is provided so as to be tangent to the swivel separation chamber 3 and communicate with the inside of the swirl separation chamber 3.

An outlet of the upstream side 1A of the sewage main pipe 1 is connected to an inlet of the sewage introduction passage 4, and a drain port 32 is
The inlet of the downstream side 1B in the sewage main pipe 1 is connected, and the inlet of the upstream side 1A is connected to the discharge port of the sewage pump P. The outlet of the foreign matter discharge passage 6 is connected to a foreign matter transport pipe 7 via a valve 8. The downstream end of the downstream side 1B faces, for example, a treated water tank (not shown). The outlet at the downstream end faces, for example, a treatment plant (not shown). In the figure, reference numeral 9 denotes a cylindrical spacer, which is provided corresponding to the outlet of the sewage introduction passage 4 in order to rectify the swirling flow S of the sewage in the swirl separation chamber 3.

In the above configuration, the sewage pumped to the upstream side 1A of the sewage main pipe 1 by the operation of the sewage pump P
It is introduced from the sewage introduction passage 4 into the swirl separation chamber 3 and is converted into a fast swirl flow S. Most of the foreign matter such as dust and scum contained in the fast swirling flow is taken away to the foreign matter discharge passage 6 together with a part of the sewage, and is conveyed to a predetermined treatment plant (not shown) by the foreign matter conveying pipe 7 and collected. Is done.

On the other hand, the sewage swirling in the swirl separation chamber 3 still contains a small amount of foreign matter. This slight foreign matter is removed by the tubular inner strainer 5. The sewage from which foreign matters are almost completely removed passes through the inner strainer 5 and is sent from the drain port 32 to the downstream side 1A of the sewage main pipe 1, and is drained from a downstream end outlet into a predetermined treated water tank (not shown). .

As described above, foreign substances such as dust and scum are separated from the sewage pumped to the sewage main pipe 1, and the separated foreign substances flow down to a predetermined treatment plant. Since the waste water is drained from the sewage main pipe to a predetermined treatment water tank or the like, it is possible to obviate the cumbersome attachment / detachment work, foreign matter collection work, foreign matter transport work, and the like, which are conventionally performed regularly.

If the axial dimension L (see FIG. 1) is made sufficiently large without changing the diameter of the cylindrical inner strainer 5, the passage passing from the outside to the inside of the inner strainer 5, as shown in FIG. Change the flow velocity Vm to the swirl velocity Vr
It can be much smaller than that. In other words, the action of flowing foreign matter in the tangential direction of the inner strainer 5 becomes stronger, so that the foreign matter is less likely to be attracted to the inner strainer 5 and the inner strainer 5 is less likely to be clogged. As a result, the sewage flow state to the downstream side 1A of the sewage main pipe 1 is improved, so that the amount of drainage from the outlet of the downstream side 1A to a predetermined treatment water tank or the like is reduced, or an extra load is applied to the sewage pump P. Inconveniences such as an increase in power consumption of the pump motor can be avoided.

[0019]

As described above, the present invention separates foreign matter such as dust and scum from wastewater fed to a wastewater main pipe, and allows the separated foreign matter to flow down to a predetermined treatment plant and the like. Can be drained from the sewage main pipe to a predetermined treatment tank, eliminating the need for cumbersome attachment / detachment work, foreign matter collection work, foreign matter transport work, etc., which were conventionally performed regularly. be able to.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is an explanatory diagram showing a relationship between a passing flow and a swirling flow with respect to an inner strainer.

FIG. 5 is a system diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sewage main pipe 2 Strainer 3 Revolving separation room 4 Sewage introduction passage 5 Cylindrical inner strainer 6 Foreign matter discharge passage 7 Foreign matter transport pipe 32 Drainage outlet

Claims (1)

[Claims] 1. A swirling separation chamber having an axial end closed and a drain port provided at an axial other end, and a swivel separation chamber provided at or near a tangent to the swirl separation chamber. A sewage introduction passage for introducing sewage into the sewage separation chamber, and a tubular inner strainer corresponding to the drain port and extending into the slewing separation chamber. A foreign matter discharge passage for discharging foreign matters swirling together with the sewage in the swirl separation chamber together with a part of the sewage; an upstream outlet of the sewage main pipe is connected to an inlet of the sewage introduction passage; A strainer, wherein a downstream inlet is connected and a foreign matter transport pipe is connected to an outlet of the foreign matter discharge passage.