JP3294904B2 - Scum box water supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply device for a scum box, and more particularly to a water supply device for supplying water in a tank to a scum box of a sludge scraper installed in a sedimentation tank or a concentration tank as washing water. .

[0002]

2. Description of the Related Art Generally, in a sedimentation basin or a concentration tank, scum is generated near the water surface, and a device is provided which scrapes the scum by a skimmer blade suspended from a skimmer arm and discharges the scum to a scum box.

However, in such a sedimentation basin,
When the scum concentration is high, a problem that scum stays in the scum box or the scum discharge pipe and clogs may occur. Further, the scum is discharged intermittently by the skimmer blade, and the scum scraping amount is small. Therefore, even when the scum concentration is low, the scum may similarly stay and become jammed.

[0004] In order to prevent the scum from staying in the scum box or the scum discharge pipe and becoming jammed,
Japanese Utility Model Publication No. 63-10862 proposes a water supply device for supplying water in a tank to a scum box as washing water.

The water supply device for a scum box disclosed in Japanese Utility Model Publication No. 63-10862 discloses an opening provided on a side surface of a scum box, a gate for opening and closing the opening, and a swing arm for supporting the gate. And a biasing member for urging the swing arm so that the gate closes the opening, and a pressing member for pushing down the swing arm so that the gate opens the opening.

[0006]

In the conventional water supply device for a scum box having the above-described structure, a rectangular opening having a large opening area is formed on a side surface of the scum box. Since the opening is opened and closed by a gate provided with a rubber plate on the sealing surface, there is a problem that it is difficult to ensure the sealing performance when the gate is closed. This is because it is difficult to seal the entire opening portion having a large opening area with a swinging gate due to securing the flatness of the valve element and the valve seat, and one-side contact of the valve element. Further, in order to seal the entire surface of the large opening area, the rubber plate is pressed against the rubber plate, so that the rubber plate is seriously damaged.

Further, since the opening area of the opening is large,
There is a problem that the flow rate of the flowing washing water is low, and the scum accumulated in the scum box or the scum discharge pipe cannot be washed away. In addition, there is a disadvantage that the amount of water consumption is large because the opening area of the opening is large.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a scum box water supply device which can easily ensure sealing performance and can obtain washing water having a high flow rate. .

[0009]

In order to achieve the above-mentioned object, a water supply device for a scum box according to the present invention is driven by a skimmer blade disposed on a skimmer arm movably provided in a sedimentation tank or a concentration tank. In a water supply device for supplying washing water to a scum box for receiving and discharging the scum, a striker installed in the skimmer arm, a scum box inserted into the scum box and outside the scum box. A water supply pipe having an opening at a depth position below the stagnation layer, and an opening / closing mechanism for opening and closing the opening intermittently by the striker, wherein the water supply pipe has cleaning water at an outer peripheral portion located in the scum box. The opening / closing mechanism includes a swingable gate having a pivotal support above the opening; And is characterized in that comprising a gate actuating member for separating the gate is in contact with the said opening being operated from the opening by Ika. It is preferable that the jet holes are formed on both sides or a lower portion of the water supply pipe. Further, the shape and number thereof can be appropriately selected, and may be a slit shape.

[0010]

According to the present invention having the above-described structure, when the gate operating member is operated by the striker, the gate closing the opening of the water supply pipe is opened, and the water in the tank flows into the water supply pipe. Ejects from the orifice. The scum accumulated in the scum box is washed away by the force of the jetted washing water. As described above, since the opening of the water supply pipe provided in the scum box is opened and closed by the gate, the opening area of the opening is small, and it is easy to secure the sealing property. Further, since the washing water can be ejected from the ejection holes provided in the water supply pipe, washing water having a high flow rate can be obtained, and scum accumulated in the scum box can be washed away with a small amount of washing water.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a water supply device for a scum box according to the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a sludge scraper 1 for collecting and removing sediment in a pit P at the center of the bottom of the pond is installed in the sedimentation basin S. The sludge scraper 1 includes a rake arm 2 and a rake 3 supported by the rake arm 2.
And a rotating shaft 4 connected to a motor M for driving the rake arm 2 to rotate.

A skimmer arm 5 is provided above the rotary shaft 4.
Is fixed, and a skimmer blade 6 for hanging scum to the skimmer arm 5 and discharging the scum to the scum box 7 is suspended. A scum discharge pipe 8 is provided at the bottom of the scum box 7, and the scum discharged into the scum box 7 is discharged to the outside of the sedimentation basin S via the scum discharge pipe 8. .

A center well 9 is provided at the center of the settling basin S, and raw water is supplied to the center well 9 by a raw water inflow pipe 10. Note that reference numeral 11 is a drainage culvert.

As shown in FIGS. 4 and 5, the scum box 7 has a box shape composed of a side plate 7a, an inclined plate 7b, and a bottom plate 7c. Is connected to the scum discharge pipe 8. The scum box 7 is fixed to the tank wall 14 via the support 13 so that the scum inlet 7i is slightly higher than the water surface as shown in FIGS. A circular water supply pipe 15 is inserted into one side plate 7a of the scum box 7 and inserted into the scum box 7 (see FIGS. 3 to 5). One end of the water supply pipe 15 is located outside the scum box 7, and the opening 15a formed at this end is located at a depth equal to or less than the scum retention layer. The other end of the water supply pipe 15 is closed by the side plate 7a.

The water supply pipe 15 is located above the inclined plate 7b, and has a plurality of ejection holes 15n for ejecting washing water at an outer peripheral portion located in the scum box 7. The jet holes 15n are formed on both sides of the water supply pipe 15. A rectangular flange 16 is joined to the opening 15a of the water supply pipe 15.

A bracket 17 is fixed to the side plate 7b of the scum box 7 slightly above the water supply pipe 15 as shown in FIG.
Opening / closing mechanism 1 for intermittently opening / closing the opening 15a
8 is pivoted. The opening / closing mechanism 18 includes a bracket 17
Gate 20 which is rotatably supported by a pivot shaft 19
And an arm 21 having an upper end fixed to the pivot 19 and a roller 22 provided at the lower end of the arm 21. The arm 21 and the roller 22 constitute a gate operating member. A packing 23 made of a rubber plate or the like is adhered to the gate 20 at a contact surface of the water supply pipe 15 with the opening 15a.

On the other hand, as shown in FIG. 3, the skimmer blade 6 suspended from the skimmer arm 5 is provided with a rubber plate 25 at the lower end, and the rubber plate 25 runs near the water surface. It has become. A striker 26 is suspended from the skimmer arm 5, and the striker 26 includes inclined plates 27 and 29 and a horizontal plate 28 on both sides. The striker 26 has the opening / closing mechanism 18
The traveling trajectory is set so as to abut against and push up the roller 22 that constitutes the roller.

The scum inlet 7i of the scum box 7
The scum inlet 7 is provided with partition walls 35 and 36 facing each other.
The inclined plates 37 and 38 are provided to face i. One end of the inclined plate 37 is located at substantially the same height as the lower end of the rubber plate 25 and has a rising gradient in the traveling direction of the skimmer blade 6, and is connected to the partition walls 35 and 36 to form a gutter type scum discharge passage. The scum discharge path, the scum inlet 7i, and the inclined plate 38 are arranged on the running track of the rubber plate 25.

The width of the rubber plate 25 is slightly smaller than the width of the inclined plate 37.
Are arranged substantially in parallel with the direction of travel and in the vertical direction.

Next, the operation of the scum box water supply device configured as described above will be described. If the skimmer arm 5 is turned by rotating the rotating shaft 4, the skimmer blade 6 and the striker 26 also turn in the direction of the arrow in FIG. The rubber plate 25 of the skimmer blade 6 scrapes scum staying in the vicinity of the water surface, lifts the scum along the scum discharge path provided in the scum box 7, and discharges the scum into the scum box 7. The striker 26 is a roller 2 of the opening / closing mechanism 18.
When the gate 20 does not come into contact with the roller 22, the gate 20 uses its own weight and the weight of the roller 22 and the arm 21 to open the opening 15 a of the water supply pipe 15.
Is closed.

The inclined plate 27 of the striker 26 is
2, the roller 22 is gradually pushed up, the gate 20 is separated from the opening 15a, and the water in the tank is drained from the water supply pipe 15.
The opening 15a is fully opened (the state shown by the imaginary line in FIG. 3) while the roller 22 is in contact with the flat plate 28 while starting to jet into the scum box 7 via the jet hole 15n. When the opening 15a is in a fully opened state, the washing water is gushered at a faster flow velocity than the outlet 15n. The scum retained in the scum box 7 is washed away by the force of the jetted washing water, and is discharged through the scum discharge pipe 8.

When the roller 22 further contacts the inclined plate 29, the gate 20 gradually closes the opening 15a due to its own weight and the own weight of the roller 22 and the arm 21, and when the contact is completed, the gate 20 opens. 15a is fully closed.

In this way, the scum is discharged to the scum box 7 by the skimmer blade 6 and the washing water is supplied to the scum box 7 by the striker 26 and the opening / closing mechanism 18. These two operations are substantially parallel. The cleaning water may be supplied immediately after the scum is discharged. The cleaning time can be freely set depending on the shape and mounting position of the striker 26. Further, by appropriately selecting the number and size of the ejection holes 15n of the water supply pipe 15, an optimum cleaning speed can be obtained. As mentioned above, although one Embodiment was described about this invention, this invention is not limited to this of course.

[0025]

As described above, according to the present invention, since the opening of the water supply pipe provided in the scum box is opened and closed by the gate, the opening area is small, and the sealing performance is ensured. Easy.

Further, according to the present invention, the washing water can be jetted from the jet holes provided in the water supply pipe, so that the washing water having a high flow rate can be obtained, and a small amount of the washing water stays in the scum box. The scum that has been removed can be reliably washed away.

Further, according to the present invention, since the opening of the water supply pipe is closed by the weight of the gate and the gate operating member in addition to the small surface area of the sealing surface, the sealing surface of the gate is closed. Damage to the provided seal member can be prevented.

Further, according to the present invention, an optimum cleaning speed can be obtained by appropriately selecting the number and size of the jet holes of the water supply pipe.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a sedimentation basin and a sludge scraper provided with a scum box water supply device according to the present invention.

FIG. 2 is a side view showing one embodiment of a water supply device for a scum box according to the present invention.

FIG. 3 is a view taken along line III-III in FIG. 2;

FIG. 4 is an exploded perspective view of a scum box and an opening / closing mechanism in an embodiment of a scum box water supply device according to the present invention.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

[Explanation of symbols]

 Reference Signs List 5 skimmer arm 6 skimmer blade 7 scum box 8 scum discharge pipe 15 water supply pipe 15a opening 15n ejection hole 18 opening / closing mechanism 20 gate 21 arm 22 roller 26 roller 26 striker 27, 29 inclined plate 28 horizontal plate

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) C02F 1/40 B01D 21/24

Claims (2)

(57) [Claims] 1. A water supply device for supplying washing water to a scum box for receiving and discharging scum gathered by a skimmer blade disposed on a skimmer arm movably provided in a sedimentation tank or a concentration tank. A striker installed on the skimmer arm, a water supply pipe inserted into the scum box and having an opening outside the scum box and at a depth position equal to or less than the scum retention layer, and the striker An opening / closing mechanism that opens and closes intermittently by the water supply pipe. The water supply pipe has an ejection hole for ejecting washing water at an outer peripheral portion located in the scum box, and the opening / closing mechanism pivots above the opening. A swingable gate having a support, and a gate actuated by the striker to separate the gate contacting the opening from the opening. A water supply device for a scum box, comprising a gate operating member. 2. The gate operating member comprises an arm connected to a pivot portion of the gate, and a roller provided at a lower end of the arm, and the gate operating member brings the gate into contact with the opening. The water supply device for a scum box according to claim 1, wherein the water supply device comprises a biasing member.