JPH0725903U - Scum removal device - Google Patents

Abstract

(57) [Summary] [Objective] To provide a scum removing device which can also remove scum floating on the water surface inside the feed well. [Structure] Rotating shaft 1 disposed in a sediment tank 11
4, a scum skimmer 15 fixed to the rotating shaft 14 and extending in the radial direction, and a feed well 1 fixed to the settling tank 11 for receiving waste water supplied from the outside.
6 and a tubular pipe skimmer 19 having an opening 19a. The scum skimmer 15 is provided on the outer side of the feed well 16 and is an outer scum rake plate 15b.
Inside the feed well 16 and the inner scum scraping plate 15
c, the pipe skimmer 19 extends through the feed well 16 and the openings 19 a are located outside and inside the feed well 16. Therefore, scum floating on the water surface outside and inside the feed well 16 is scraped.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a scum removing device.

[0002]

[Prior art]

 Conventionally, in a settling tank for water treatment, sewage supplied from the outside is separated into suspended substances and treated water. In this case, a scum removing device is used to remove scum floating on the water surface of the settling tank. The scum removing device has a scum skimmer extending in the radial direction, and by rotating the scum skimmer about a rotation axis, the scum is scraped up and discharged to the outside of the system via a pipe skimmer. I have to.

FIG. 2 is a plan view of a conventional scum removing device, FIG. 3 is a sectional view taken along the line AA of FIG. 2, FIG. 4 is a plan view of essential parts of a conventional scum removing device, and FIG. It is a B sectional view. In the figure, 11 is a circular settling tank to which sewage is supplied from the outside, and a cylindrical treated water overflow plate 12 is concentrically fixed to the periphery of the settling tank 11. Triangular notches (not shown) are formed at various locations in the circumferential direction of the treated water overflow plate 12, and the treated water separated from the suspended substance in the settling tank 11 is radially outward through the triangular notches. Overflow into trough 17. Therefore, the level of the water surface of the settling tank 11 (hereinafter referred to as "overflow water level") is set to the middle portion of the triangular notch.

Further, a cylindrical baffle plate 13 is provided further on the inner peripheral side of the treated water overflow plate 12 to prevent scum from flowing out. The upper end of the baffle plate 13 projects above the water surface, and the treated water passes under the baffle plate 13 and moves radially outward. Further, 14 is a rotary shaft rotated by a drive device (not shown), and a scum skimmer 15 is fixed to the rotary shaft 14. The scum skimmer 15 has an inner end fixed to the rotary shaft 14 and includes a rod 15a extending outward in the radial direction and a scum rake plate 15b hanging downward from the rod 15a. The scum scraping plate 15b is made of a strip-shaped plate, and the position thereof is set so that the lower end thereof extends slightly downward from the water surface.

A cylindrical feed well 16 is fixed around the rotary shaft 14 and rotates together with the rotary shaft 14. The sewage supplied from the outside is received by the feed well 16. By the way, a tubular pipe skimmer 19 extending in the radial direction is arranged along the water surface of the settling tank 11, and an opening 19 a extending in the axial direction is formed in an upper portion of the pipe skimmer 19. A fixed mount 20 is disposed below the pipe skimmer 19 between the inner circumference of the baffle plate 13 and the outer circumference of the feed well 16, and the fixed mount 20 extends in the radial direction along the pipe skimmer 19. To do.

Bearings 22 are provided at both ends of the pipe skimmer 19, and the pipe skimmer 19 is rotatably supported by the fixed mount 20 via the bearings 22. Therefore, by rotating the pipe skimmer 19, the direction in which the opening 19a opens can be inclined toward the side facing the scum skimmer 15, and a part of the opening 19a can be positioned in the dirty water. In this way, the scum attracted by the scum skimmer 15 is swallowed in the pipe skimmer 19.

In order to rotate the pipe skimmer 19, an opening kicker 23 and a closing kicker 24 are provided on the outer periphery of the feed well 16 so as to be displaced in the vertical and rotational directions. On the other hand, an opening lever 25 corresponding to the opening kicker 23 and a closing lever 26 corresponding to the closing kicker 24 project upward and downward with their phases shifted from each other on the outer circumference of the inner end of the pipe skimmer 19. Set up. The opening kicker 23 and the closing kicker 24 do not need to be directly attached to the outer peripheral wall surface of the feed well 16, but may be attached to the rotary shaft 14 or a member integrated with the rotary shaft 14 so as to be radially outside the feed well 16. You may make it project to one direction.

As shown in FIG. 5, the opening kicker 23 located at the lower front of the feedwell 16 in the rotational direction pushes and retracts the opening lever 25 located below the pipe skimmer 19, The pipe skimmer 19 rotates in the direction of arrow C as shown by the chain double-dashed line, and positions a part of the opening 19a in the dirty water. On the other hand, the closing kicker 24 located at the upper rear of the feedwell 16 in the rotating direction pushes the closing lever 26 located above the pipe skimmer 19 away, so that the pipe skimmer 19 returns to the original position shown by the solid line.

[0009]

[Problems to be solved by the device]

 However, in the conventional scum removing device, the sewage supplied from the outside is received by the feed well 16, and a large amount of scum floats on the water surface inside the feed well 16. Since 19 is arranged between the inner circumference of the baffle plate 13 and the outer circumference of the feed well 16, scum floating on the water surface inside the feed well 16 cannot be removed.

An object of the present invention is to solve the problems of the conventional scum removing device and to provide a scum removing device that can also remove scum floating on the water surface inside the feedwell.

[0011]

[Means for Solving the Problems]

 Therefore, in the scum removing device of the present invention, a rotating shaft disposed in the settling tank, a scum skimmer fixed to the rotating shaft and extending in the radial direction, and fixed to the settling tank from the outside. It has a feed well for receiving the supplied sewage and a tubular pipe skimmer extending in the radial direction along the water surface and having an opening for swallowing the scum.

The scum skimmer is provided with an outer scum rake plate outside the feed well and an inner scum rake plate inside the feed well, the pipe skimmer extending through the feed well, and the opening being a feed hole. Located outside and inside the well.

[0013]

[Action]

 According to the present invention, as described above, in the scum removing device, the rotating shaft disposed in the settling tank, the scum skimmer fixed to the rotating shaft and extending in the radial direction, and the above-described settling tank are provided. It has a feed well that is fixed and that receives sewage supplied from the outside, and a tubular pipe skimmer that extends in the radial direction along the water surface and that has an opening for swallowing scum.

The scum skimmer is provided with an outer scum rake plate outside the feed well and an inner scum rake plate inside the feed well, the pipe skimmer extending through the feed well, and the opening being the feed. Located outside and inside the well. Therefore, the sewage supplied from the outside is received by the feed well, and is separated into suspended substances and treated water in the settling tank, and the treated water is discharged from the settling tank. Meanwhile, the scum floating on the water surface outside the feedwell is attracted by the outer scum draw plate of the scum skimmer, and the scum floating on the water surface inside the feed well is attracted by the inner scum draw plate of the scum skimmer. , It is swallowed in the pipe gap through the opening.

[0015]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of a precipitation tank according to an embodiment of the present invention, and FIG. 6 is a plan view of the precipitation tank according to an embodiment of the present invention. In the figure, 11 is a circular settling tank to which sewage is supplied from the outside, and a cylindrical treated water overflow plate 12 is concentrically fixed to the periphery of the settling tank 11. Triangular notches (not shown) are formed at various locations in the circumferential direction of the treated water overflow plate 12, and the treated water separated from the suspended substance in the settling tank 11 is radially outward through the triangular notches. Overflow into trough 17. Therefore, the overflow water level is set in the middle of the triangular notch.

Further, a cylindrical baffle plate 13 is disposed further on the inner peripheral side of the treated water overflow plate 12 to prevent scum from flowing out. The upper end of the baffle plate 13 projects above the water surface, and the treated water passes under the baffle plate 13 and moves radially outward. A walkway 30 is installed above the settling tank 11, and a drive unit 31 is disposed in the center above the walkway 30. Further, 14 is a rotary shaft that is rotated by the drive device 31, and the scum skimmer 15 and the sludge attracting blade 33 are fixed to the rotary shaft 14.

By the way, an inflow pipe 51 is arranged to supply wastewater to the settling tank 11 from the outside. The inflow pipe 51 penetrates the side wall of the precipitation tank 11 and extends radially inward, and has an elbow 51a at its tip. The elbow 51a opens upward near the center of the settling tank 11. Further, a dummy pipe 53 is further connected to the connecting portion between the inflow pipe 51 and the elbow 51a. The dummy pipe 53 extends on the extension line of the inflow pipe 51 avoiding the rotary shaft 14, reaches the facing portion of the side wall of the settling tank 11, and has a tip end by a bracket 54 protruding from the facing portion of the side wall. Supported.

In this way, the inflow pipe 51 and the dummy pipe 53 are integrally installed in the precipitation tank 11 and support the feed well 16 near the center. The feedwell 16 has a cylindrical shape, is supported by the inflow pipe 51 and the dummy pipe 53 and extends upward, and has an upper end protruding from the water surface and opening. On the other hand, the lower end of the feed well 16 is opened in the wastewater, and the inner and outer sides of the feed well 16 are communicated with each other at the lower end.

Further, the elbow 51 a is opened inside the feed well 16, and the waste water supplied through the inflow pipe 51 is discharged into the feed well 16. Thus, the wastewater supplied from the outside is received by the feedwell 16. A beam (not shown) may be installed in the precipitation tank 11 separately from the inflow pipe 51, and the feed well 16 may be supported by the beam.

The waste water flowing out into the feed well 16 flows out from the lower end of the feed well 16 to the outside of the feed well 16 and is separated into a suspended substance and treated water. The sludge scraping blades 33 are radially extended along the bottom surface of the settling tank 11 and scrape the suspended solids separated from the wastewater in the settling tank 11 to form sludge.

An inner end of the scum skimmer 15 is fixed to the rotary shaft 14, and a rod 15a extending in a radial direction is hung downward from the rod 15a. The outer periphery of the feed well 16 and a baffle plate 15 are provided. 13 includes an outer scum draw plate 15b extending between inner circumferences of 13 and an inner scum draw plate 15c hanging downward from a rod 15a and extending from the inner circumference of the feed well 16 toward the rotary shaft 14. . The outer side scum draw plate 15b and the inner scum draw plate 15c are made of rubber strips, and their positions are set so that their lower ends extend slightly downward from the water surface.

By the way, a pipe pipe skimmer 19 extending in the radial direction is arranged along the water surface of the settling tank 11, and an opening 19a extending in the axial direction is formed in an upper portion of the pipe skimmer 19. To be done. The pipe skimmer 19 is supported radially outward by a scum collection box 35, and radially inward through the feed well 16 and is supported by a beam 36 installed in the precipitation tank 11.

A bearing 39 is arranged at the radially outer end of the pipe skimmer 19 and a bearing 40 is arranged at the radially inner end of the pipe skimmer 19, and the pipe skimmer 19 rotates through the bearings 39, 40. It is movably supported. Therefore, by rotating the pipe skimmer 19, the direction in which the opening 19a opens can be inclined toward the side facing the scum skimmer 15, and a part of the opening 19a can be positioned in the dirty water. In this way, the scum scraped by the scum skimmer 15 is swallowed into the pipe skimmer 19.

In this case, since the pipe skimmer 19 penetrates the feed well 16 and extends inward of the feed well 16, the opening 19 a is located not only outside the feed well 16 but also inside. Therefore, on the outside of the feed well 16, the scum is scraped by the outer scum scraper plate 15b of the scum skimmer 15, and on the inside of the feed well 16, the scum is scraped by the inner scum scraper plate 15c of the scum skimmer 15. Both are swallowed into the pipe skimmer 19 through the opening 19a.

Therefore, not only the scum floating on the water surface outside the feed well 16 but also the scum floating on the water surface inside the feed well 16 can be removed. In order to rotate the pipe skimmer 19, an opening kicker 23 and a closing kicker 24, which serve as a rotating means, are provided on the rotating shaft 14 so as to be displaced in the vertical direction and the front-rear direction in the rotating direction. . On the other hand, on the outer circumference of the inner end of the pipe skimmer 19, an opening lever 25 as a rotating means corresponding to the opening kicker 23 and a closing lever as a rotating means corresponding to the closing kicker 24 are provided. The levers 26 are provided so as to project upward and downward with their phases shifted from each other.

Then, the opening kicker 23 located at the lower front of the rotating shaft 14 in the rotation direction pushes the opening lever 25 located below the pipe skimmer 19 away, whereby the pipe skimmer 19 is rotated, and the opening 19a is opened. Place a part in the dirty water. On the other hand, the closing kicker 24 located at the upper rear of the rotating shaft 14 in the rotation direction pushes the closing lever 26 located above the pipe skimmer 19 away, so that the pipe skimmer 19 returns to the original position.

The attachment positions of the opening lever 25 and the closing lever 26 attached to the pipe skimmer 19 are set so that the amount of treated water swallowed at the same time when the scum is swallowed into the pipe skimmer 19 is minimized. To be done. In this way, the opening kicker 23 pushes the opening lever 25 away immediately before the scum skimmer 15 passes over the pipe skimmer 19, whereby the pipe skimmer 19 rotates by the angle necessary for swallowing the scum, It swallows the scum raked up by the scum gap 15. Then, the swallowed scum is collected in the recovery box 35 and discharged from the recovery box 35 to the outside of the system.

On the other hand, immediately after the scum skimmer 15 has passed the pipe skimmer 19, the closing kicker 24 pushes the closing lever 26 back, and the pipe skimmer 19 returns to the original position. It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made based on the spirit of the present invention, and they are not excluded from the scope of the present invention.

[0029]

[Effect of device]

 As described in detail above, according to the present invention, in the scum removing device, the rotating shaft disposed in the sedimentation tank, the scum skimmer fixed to the rotating shaft and extending in the radial direction, It has a feed well fixed to the settling tank for receiving sewage supplied from the outside, and a tubular pipe skimmer that extends radially along the water surface and has an opening for swallowing scum. .

The scum skimmer is provided with an outer scum rake plate on the outside of the feed well and an inner scum rake plate on the inside of the feed well, the pipe skimmer extending through the feed well, and the opening being the feed. Located outside and inside the well. Therefore, the scum floating on the water surface outside the feedwell is scraped by the scum skimmer's outer scum plate, and the scum floating on the water surface inside the feedwell is scratched by the scum skimmer's inner scum plate. It is swallowed into the pipe gap through the opening. As a result, not only scum floating on the water surface outside the feedwell but also scum floating on the water surface inside the feedwell can be removed.

[Brief description of drawings]

FIG. 1 is a sectional view of a settling tank according to an embodiment of the present invention.

FIG. 2 is a plan view of a conventional scum removing device.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a plan view of a main part of a conventional scum removing device.

5 is a sectional view taken along line BB of FIG.

FIG. 6 is a plan view of a settling tank according to an embodiment of the present invention.

[Explanation of symbols]

 11 settling tank 14 rotating shaft 15 scum skimmer 15b outer scum rake plate 15c inner scum rake plate 16 feedwell 19 pipe skimmer 19a opening

Claims (1)

[Scope of utility model registration request] 1. A rotating shaft disposed in a settling tank, (b) a scum skimmer fixed to the rotating shaft and extending in a radial direction, and (c) fixed to the settling tank. (E) a feed well for receiving sewage supplied from the outside, and (d) a tubular pipe skimmer extending in the radial direction along the water surface and having an opening for swallowing the scum, and (e) ) The scum skimmer comprises an outer scum draw plate outside the feed well and an inner scum draw plate inside the feed well; (f) the pipe skimmer extends through the feed well; and (g) the opening. Is located outside and inside the feed well.