JP2002320965A - Water level detection equipment for scum discharge system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water level detection equipment which controls a crevice pipe 8 to drain scum, certainly operates and is easy to clean. SOLUTION: Gear type transmission system is composed by fixing a water level sensor 11 to a pinion shaft 16 by meshing a sector gear 13 with a pinion 14 supported by a fixed shaft 15 by firmly fixing the sector gear 13 to a flange portion 9 united with the crevice pipe 8 where scum is flownin in A1 direction. The flange portion 9 has a control equipment and moves a position of a crevice 8a up and down by revolving the crevice pipe 8. As indicated by an imaginary line, in case the crevice 8a for the crevice pipe 8 is at upper portion of inflow prevention position, the water level sensor 11 also is at upper portion. When the crevice pipe 8 moves to a solid line position by revolving in B direction, scum flows into the crevice pipe 8 through the crevice 8a moved to a lower portion, a contact piece 12 is directed downward, and its edge goes to L2 lower than water level L1. When the water level goes low to L2 by scum flowing, the crevice pipe 8 and the sensor 11 return to the position of the imaginary line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for sedimenting sewage in sewage while inflowing domestic wastewater including human waste as sewage.
The present invention relates to a device for discharging suspended matter called scum floating on the surface of sewage in a sewage treatment tank designed to be decomposed in a direction intersecting with the flow direction of the sewage. In such a sewage treatment tank, scum is generated and grows on the surface of the sewage and adheres to the tank wall and attached equipment, making removal extremely difficult. are doing.

[0002]

2. Description of the Related Art In a conventional scum discharge device, a large number of rotatable gap pipes having a gap facing upstream with respect to the flow of sewage are continuously installed in a lateral direction, and the gap between each gap pipe is set. Are periodically lowered to the surface of the water to allow the scum to flow out, and when the water level falls to the lower part of the gap, the gap is raised to the surface of the water to stop the flow.

As means for detecting the water level of sewage, in a conventional apparatus, a water level sensor having a downward contact is suspended by a chain so as to move up and down in a box-shaped guide and wave shield, and a gap is provided. At the same time as rotating the gap of the pipe to the outflow position, the contact is lowered to the water surface detection position, and when the scum flows out and the water surface falls to the detection position, the gap pipe is returned to the outflow prevention position, and the water level sensor is returned to the upper position Like that.

In this device, waste is easily clogged between the water level sensor and the box-shaped guide / wavebreaker, which may hinder the operation of the sewage treatment tank. Is difficult to clean due to the small space between them, and furthermore, the chain for moving the water level sensor may be stretched, which causes inaccurate operation of the gap pipe.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the above-mentioned conventional apparatus and to obtain an apparatus which can be easily cleaned and operates reliably.

[0006]

According to a first aspect of the present invention, there is provided a sewage treatment tank provided with a plurality of partition walls extending in a flowing water direction, each of which is provided on a line intersecting the flowing water direction. A fixed pipe is fixed to the partition wall, and a gap pipe provided with a gap for sewage discharge in the longitudinal direction is rotatably supported by the opposed fixed pipe, and a rotating mechanism is connected to the gap pipe, and at a predetermined time, In the water level detection device of the scum discharge device, a sector gear is mounted on the clearance pipe so that the gap is rotated to the outflow position to allow sewage to flow therein, the lowering of the water level of the sewage is detected, and the clearance is rotated to the position for preventing the outflow. A pinion that is fixed and meshes with the pinion is supported by a fixed shaft provided on a fixing member, and a contact of a water level sensor for detecting a water level of the sewage and operating a rotating mechanism is provided integrally with the pinion. And

According to this means, since the gap pipe and the water level sensor are interlocked by the sector gear and the pinion, the positions of the gap pipe and the water level sensor do not deviate, and the gap pipe rotates accurately. Further, the mechanism is simple and cleaning is easy.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a sewage treatment tank, 2 is a partition, and a plurality of the partitions 2 are provided in parallel with the flow direction of the sewage indicated by arrow A. 3 is a scum discharge device, which is installed crossing the flow direction A,
As shown in FIG. 2, the scum discharge device 3 is formed by connecting a plurality of gap units 4 in a continuous manner. The center of the tank is a watershed, and a downward slope of about 5 degrees is provided on both sides from a pipe located here. And the most downstream clearance unit 4
Opens outside the sewage treatment tank 1 at the position indicated by 3a in FIG.

The gap unit 4 is provided between the pair of partitions 2, 2, and a fixed pipe 5 is attached to a mounting portion embedded in the partition 2.
And receiving pipes 6 are fixed, and a rotating pipe 7 is rotatably supported on each receiving pipe 6.
A gap pipe 8 having a gap 8 a opened in the longitudinal direction is connected by a flange 9. As shown in FIG. 3, the flange portion 9 is further connected to a vertically moving spindle 10a provided in the clearance pipe control device 10 by a link mechanism 10b. The spindle 10a is driven by a motor 10c and moves up and down while being guided by a spindle bearing 10d.

The water level at the discharge limit of sewage is detected by a water level sensor 11 shown in FIGS. The sector gear 13 is fixed to the flange portion 9 of the gap pipe 8 in addition to the connection of the link mechanism 10b, and meshes with the pinion 14 to constitute a gear type water level detecting device. In FIG.
A pinion shaft 15 is fixed to a receiving pipe 6 which is a fixing member via an arm 15a, and a sleeve 16 integrated with the pinion 14 is rotatably supported and held by a stopper washer 17. The water level sensor 11 is fixed to the sleeve 16 via the arm 11a, and the contact 12 is turned to a detection position where the contact is directed downward and a retracted position where the contact is directed laterally. The water level sensor 11 includes two contacts 12 whose tip positions are slightly different in order to prevent malfunction.

Normally, the water level sensor 11 is at the retracted position shown by a virtual line in FIG. 4, and the gap 8a of the gap pipe 8 is at the uppermost blocking position. The timer 1 is operated periodically, or the spindle 1 of the clearance pipe control device 10 is arbitrarily selected manually.
When the gap 8a is raised, the gap pipe 8 rotates in the direction of arrow B to the solid line position in FIG. 4, and the gap lower edge 8a1 of the gap 8a
Falls below the water surface L1, the scum flows in the A1 direction, and flows out to the next pipe. At this time, the sector gear 13
Also rotates in the direction B, the pinion 14 is rotated clockwise, the water level sensor 11 is lowered to the solid line position, and the contact 1
2 faces downward, and its lower end is below the water surface L1.

When the discharge of the scum proceeds and the water level becomes L2 below the contact 12, the signal generated by the water level sensor 11 lowers the spiddle 10a of the gap pipe control device 10 and turns the gap pipe 8 in the direction of arrow C. The sector gear 13 and the pinion 1
The water level sensor 11 also rises to the position indicated by the virtual line by the interlocking of 4. The plurality of gap pipes 8 of the gap units 4 arranged in a line are controlled by the control device 10 to lower the gap 8a with a time lag from the center side of the tank and then to raise the gap 8a. And the scum is discharged out of the tank, and this operation is repeated at appropriate intervals.

[0013]

As described above, according to the present invention, the rotation of the gap pipe is transmitted to the water level sensor by a gear-type device in which the sector gear and the pinion mesh with each other, so that the operation is reliably transmitted and the water level sensor outputs an accurate signal. It has the advantage of transmitting light, and is entirely exposed on the water surface and has a simple structure, so that even if dirt adheres, it can be easily cleaned.

[Brief description of the drawings]

FIG. 1 is a plan view of a sewage treatment tank embodying the present invention.

FIG. 2 is a front view of a partition wall.

FIG. 3 is an explanatory diagram of a gap pipe control device.

FIG. 4 is a front view of a water level detection device.

FIG. 5 is also a side view

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sewage treatment tank 4 Gap unit 5 Fixed pipe 6 Receiving pipe 7 Rotating pipe 8 Gap pipe 8a Gap 9 Flange part 10 Gap pipe control device 11 Water level sensor 12 Contact 13 Sector gear 14 Pinion

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masahiko Mizushima 284 Nogawa, Miyama-ku, Kawasaki-shi, Kanagawa F term (reference) 2D063 DB01 4D051 AA04 AB01 CA15 DB02 DB07

Claims (1)

[Claims] 1. A plurality of partitions extending in a flowing water direction are provided inside a sewage treatment tank, fixed pipes are fixed to the respective partitions on a line intersecting the flowing water direction, and a gap for sewage discharge is provided in a longitudinal direction. The gap pipe is rotatably supported by the opposing fixed pipe, and a rotation mechanism is connected to the gap pipe. The gap is rotated to the outflow position at a predetermined time to allow sewage to flow in and detect a drop in the level of sewage. In the water level detection device of the scum discharge device, the sector gear is fixed to the gap pipe, and the pinion meshing with the sector gear is pivotally supported by a fixed shaft provided on the fixing member. A contact of a water level sensor for detecting a water level of the sewage and operating a rotating mechanism is provided integrally with the pinion,
Water level detection device for scum discharge device.