JPH11285686A - Scum sucking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To usually and stably suck scum by gathering the flow-in scum with a gathering plate toward a suction pipe. SOLUTION: The gathering plate 2 having an inverse triangular plane shape from the view point of the suction pipe 1 is provided to slowly gather the flowing-in scum continually toward the suction pipe 1. The gap between the tip part of the gathering plate 2 and the wall of a water introducing conduit is plugged by an auxiliary plate 2'. The suction pipe 1 is upwardly extended at an obtuse angle of about 135- about 136 deg. to the flowing direction of the scum, that is to the flowing direction of a raw water. As a result, the suction pipe 1 is inclined to an opposite side against the flowing side of the scum to reduce the resistance in the scum suction. Also, an inverse triangular guide plate 1b having smaller length than the gathering plate 2 is provided at the lower end surface of the suction part. Thus the scum is suppressed in sedimentation and safely sucked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scum suction device capable of efficiently sucking and removing substances floating on the water surface, so-called scum.

[0002]

2. Description of the Related Art FIG. 6 (a) is a plan view of a primary sedimentation basin in a sewage treatment plant. And a conduit G for distributing raw water. This conduit G
The scum of buoyant substances contained in the raw water tends to accumulate on the surface of the water, especially on the downstream side of the river.The workers regularly pump out the scum accumulated on the surface of the water with a ladle, or use a hose of a vacuum car Is to be sucked in the hand. In FIG. 6A, a indicates a case where a scum removing device according to the present invention described below is applied.

[0003]

However, since the above-mentioned conventional scum removal has been performed manually by an operator, it has been desired to be able to automatically remove the scum. In order to meet such a demand, for example, as disclosed in JP-A-49-77262,
It is conceivable to arrange a suction pipe connected to the vacuum pump on the water surface to automatically remove scum, but since the suction pipe of this scum suction device is fixed, direct the scum toward the suction pipe. There is a concern that it will hinder the movement. In other words, since the scum flows on the water stream, the scum does not automatically collect on the suction pipe, and the ratio of sucking only the liquid (raw water) increases.
There is a problem that the concentration of the sucked scum decreases and the load of post-processing of the scum increases, so that the conventional scum suction device cannot be used as it is.

[0006] The scum is not limited to the above-mentioned headrace G, but as shown in FIG.
However, even in this sedimentation basin, it is expected that it is difficult to keep the scum suction state constant at all times in the scum removal device in which the suction pipe is fixed. In addition,
In FIG. 6B, a shows a case where a scum removing device according to the present invention described below is applied.

Accordingly, the present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide a scum suction device capable of constantly sucking scum in a stable and constant state. Is to do.

[0006]

To achieve the above object, a scum suction device according to the present invention is a scum suction device for sucking and removing scum floating on a water surface using a suction pipe. It is characterized in that a moving plate for moving the flowing scum toward the suction pipe is provided.

In order to achieve the above object, a scum suction device according to the present invention is a scum suction device for sucking and removing a scum floating on a water surface by using a suction pipe. And a horizontal guide plate for separating the two.

In order to achieve the above object, a scum suction device according to the present invention is a scum suction device for sucking and removing scum floating on a water surface using a suction pipe. It is characterized in that an approach plate for approaching the suction pipe is provided, and a horizontal guide plate for separating scum and liquid is provided below the water surface. Further, a side portion of the guide plate on the side from which the scum flows is formed on an inclined surface inclined downward.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram when the scum suction device according to the present invention is applied to a sewer culvert, FIG. 2 is a partial detailed view thereof, and FIG. 3 is a sectional view taken along line AA of FIG. It is.

The scum suction device a is provided at the downstream end of the water conduit G as shown in FIG.
Although not shown in FIG. 1, as shown in FIGS. 2 and 3, the suction scum (not shown) is configured to be gradually collected toward the suction pipe 1. An approaching plate 2 having an inverted triangular shape when viewed from the pipe 1 is provided. In FIGS. 2 and 3, 2 '
Is an auxiliary plate for closing a gap between the end of the approach plate 2 and the wall of the conduit G not shown in FIG.

The suction pipe 1 has an obtuse angle of 135 ° to 165 ° with respect to the direction in which the scum indicated by the arrow in FIG. Is growing. That is, the suction pipe 1 is inclined to the side opposite to the side where the scum flows, in order to reduce the resistance in the suction of the scum. A suction portion 1a formed by cutting out a part of a lower side surface of the suction pipe 1 is provided at a lower portion where the scum flows. The opening shape of the suction part 1a is formed in a rectangular shape as shown in FIG. 5 described later, but may be formed in a triangular shape, a semicircular shape, or the like.

The guide plate 1b is attached to the lower end surface of the suction portion 1a, has a planar shape of an inverted triangle, is located inside the approach plate 2, and is radially centered on the suction pipe 1. The inclined surface 1 which is slightly smaller than the length of the approaching plate 2 which extends to the left, and which is bent so that the upper side (left side in FIGS. 1 to 3) of the inverted triangle is inclined downward.
b '. Therefore, the guide plate 1b prevents the scum which is likely to settle due to the water flow due to the suction force of the suction pipe 1 from being settled down, and is safely sucked into the suction pipe 1. Further, since only the water surface portion can be sucked, the concentration of scum and raw water is always kept constant, and scum of high concentration can be sucked efficiently.

An upper portion 1c of the suction pipe 1 has a sealing member 3a in a discharge pipe 3 connected to a vacuum pump (not shown).
Has been inserted through.

The positional relationship of the suction portion 1a with respect to the water surface L in the scum suction device a having the above structure will be described with reference to an enlarged view shown in FIG. 4 and a perspective view of FIG. When the distance from the upper end of the suction unit 1a to the water surface L is H1, the distance H2 from the water surface L to the lower end of the suction unit 1a (the upper surface of the guide plate 1b) is as follows.
Is determined to be approximately 1: 1 to 1: 3.

Although it varies depending on the size (cross-sectional area) of the suction pipe 1, for example, the cross-sectional area of the suction pipe 1 is 65A.
(65 mm ² ), H1 = 25 mm,
H2 = 50 mm. In any case, when H1 increases, the suction amount of the liquid (raw water) decreases, the concentration of the scum increases, and the flow of gas (air) is generated to exert the effect of bringing the scum. However, if this H1 is too large, the amount of gas (air) to be sucked increases and not only the scum suction efficiency decreases, but also the scum may be caught on the opening edge of the suction portion 1a. Further, when H1 is reduced, the amount of sucked gas decreases and the amount of liquid increases, and the concentration of the sucked scum decreases accordingly, increasing the load of the post-processing of the scum. According to the knowledge of the present applicant, if H1 is 10 to 15 mm (H2 changes accordingly), the concentration of sucked scum is not reduced unnecessarily, and the amount of gas to be sucked is significantly increased. Without causing scum, scum with a stable concentration can be efficiently sucked.

In FIG. 1, reference numeral 4 denotes a moving mechanism provided on the water surface L, which has a connecting rod 4a which moves up and down by rotation of a motor M and is parallel to the suction pipe 1. The suction pipe 1 is fixed to the lower end of the connecting rod 4a via a connecting member 4b. Therefore, when the motor M rotates forward or backward, the suction pipe 1 can be moved upward or downward.

In FIG. 1, reference numeral 5 denotes an electrode for detecting a water level. That is, it is configured such that the water surface L can be detected depending on whether a current flows between the electrodes 5.

For detecting the water level of the water surface L, various water level meters, such as an ultrasonic wave type that irradiates ultrasonic waves toward the water surface L, can be employed instead of the above-mentioned electrode type.

The controller C has a function of inputting the water level signal obtained from the electrode 5 and controlling the driving of the motor M.

The scum suction device a having the above-described structure is a
Is always detected via the electrode 5.
Then, based on the detection signal, the controller C sets the position of the suction portion 1a of the suction pipe 1 at a predetermined position with respect to the water surface L, that is, minimizes the amount of liquid (raw water) to be sucked, In addition, the position of the suction pipe 1 is controlled by rotating the motor M so that the amount of scum becomes as large as possible (see the two-dot chain line 1b in FIG. 1).

Therefore, even if the water level of the water surface L of the headrace G fluctuates, the suction pipe 1 can always suck a stable scum of a predetermined concentration. Moreover, the suction pipe 1
Even if the water flow is disturbed by the suction of the scum and the scum sinks, the scum can be prevented from sinking by the guide plate 1b.

In the above-described example, the upper part 1c of the suction pipe 1 is inserted into the discharge pipe 3 so as to be able to move in and out via the sealing member 3a, but the upper part 1c of the suction pipe 1 and the lower part of the discharge pipe 3 are flexible. A connection may be made by a tube so that the suction pipe 1 can freely move up and down.

In the above example, the scum suction device a is applied to the headrace G. However, the scum suction device a may be provided in the sedimentation basins S1 to S3 shown in FIG. 6 (b). You may make it apply to a scum removal apparatus. When removing scum with a large area such as a sedimentation basin, use FIG.
As shown in (b), a plurality of scum removing devices a, a,... Are provided so as to cover the entire water surface.

Next, some aspects of the invention including technical matters of the scum suction device a having the above-described configuration will be described. (1) In a scum suction device for sucking and removing scum floating on a water surface by using a suction pipe, a moving mechanism for moving a scum suction portion of the suction pipe along a direction orthogonal to the water surface, A scum, comprising: detecting means for detecting a water level on the water surface; and control means for controlling the moving mechanism such that a scum suction unit of the suction pipe maintains a predetermined positional relationship with the water level on the water surface. Suction device. (2) In a scum suction device for sucking and removing a scum floating on a water surface by using a suction pipe, a side of the lower end portion of the suction pipe where the scum flows is cut off to remove the scum. A scum suction device comprising a scum suction unit for sucking.

[0025]

The scum suction device according to the present invention is provided with a pulling plate for drawing the flowing scum toward the suction pipe, so that the scum is efficiently collected by the suction pipe.
Scum can be effectively sucked.

In the scum suction device according to the present invention, since the horizontal guide plate for separating the scum and the liquid is provided below the water surface, the scum and the liquid are efficiently separated, and only the scum is effectively sucked. can do.

[0027] The scum suction device according to the present invention is provided with a shift plate for drawing the flowing scum toward the suction pipe and a horizontal guide plate for separating the scum and the liquid below the water surface. High-concentration scum can be efficiently sucked. Further, when the side portion of the guide plate on the side where the scum flows is formed as an inclined surface inclined downward, the scum and the liquid can be separated and the scum having a high concentration can be sucked.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram when a scum suction device according to the present invention is applied to a headrace.

FIG. 2 is a detailed view of a suction part of FIG. 1;

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

FIG. 4 is an enlarged view of a suction portion.

FIG. 5 is a perspective view of FIG. 4;

6A is a plan view of a sedimentation basin and a headrace, and FIG. 6B is a plan view of the sedimentation basin.

[Explanation of symbols]

 a Scum suction device 1 Suction pipe 1a Suction unit 1b Guide plate 1b 'Inclined surface 1c Upper part 2 Pull plate 2' Auxiliary plate 3 Discharge pipe 4 Moving mechanism 5 Electrode C Controller M Motor G Headrace S, S1, S2 ...

Claims (4)

[Claims] 1. A scum suction device for sucking and removing scum floating on a water surface by using a suction pipe, characterized in that a closing plate for bringing flowing scum toward the suction pipe is provided. Scum suction device. 2. A scum suction device for sucking and removing scum floating on a water surface using a suction pipe, wherein a horizontal guide plate for separating scum and liquid is provided below the water surface. Scum suction device. 3. A scum suction device for sucking and removing scum floating on a water surface by using a suction pipe, wherein a squeezing plate for bringing flowing scum toward the suction pipe is provided, and a scum suction device is provided below the water surface. A scum suction device comprising a horizontal guide plate for separating scum and liquid. 4. The scum suction device according to claim 2, wherein a side portion of the guide plate on the side where the scum flows is formed on an inclined surface inclined downward.