JPS607763Y2 - concentration tank - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a thickening tank suitable for solid-liquid separation equipment with a scraping device, large circular sedimentation ponds in local wastewater treatment plants, and the like.

FIG. 1 shows an example of a conventional concentration tank. In the figure, raw water passes through an inflow pipe 1 to a feedwell 2 at the center of the tank.
flows into.

The raw water is rectified here, flows downward through the feedwell 2, passes the lower end of the feedwell 2, and then slowly spreads toward the outside near the bottom of the tank, and flows into the raw water. It gradually becomes clear by settling and separating the contained solids.

The clear water then flows upward outside the feedwell 2 and slowly rises toward the water surface.

The supernatant water that has reached near the water surface is transported to the treated water trap 6.
The water flows through the outflow pipe 11 and is sent to the next process.

On the other hand, the sludge that has settled and accumulated at the bottom of the tank is removed by the sludge scraper 4.
Center pocket 7 provided in the center of the bottom of the tank
The sludge is collected and discharged to the outside of the tank through the sludge pipe 8.

The sludge scraper 4 is driven and rotated by a drive device 9 via a drive shaft 10 .

The drive device 9 is supported by the pedestal 3, and the feedwell 2 is supported by a hanging fitting 5 from the pedestal 3.

Further, the sludge scraper 4 is supported and fixed to the drive shaft 10 via a support metal fitting 12 at an appropriate mounting angle.

In the conventional concentration tank described above, (1) Raw water is rectified in the feedwell 2, but if the length of the feedwell 2 is short, it is not rectified sufficiently;
This disturbs the flow in the tank and prevents effective settling and separation of solids.

(11) When the bottom area of the tank increases, the mounting angle between the support hardware 12 and the drive shaft 10 must be made acute in order to keep the slope of the sludge scraper 4 constant.
2 must be attached to the drive shaft 10 upward, so the support hardware 12 comes into contact with the feedwell 2, so the length of the feedwell 2 must be shortened.

(iii) When a floating sludge scraping machine is provided to scrape up sludge floating near the water surface above the drive shaft 10, the scraping machine moves between the mount 3 and the feedwell 2 above the water surface to the drive shaft. 10, the feedwell 2 needs to be supported by a frame inside the tank rather than by the hanging bracket 5, but the frame has a cantilever structure that supports the entire weight of the feedwell 2. It is a very large member because it will be supported by.

Gil+) When an elevating device is attached to the sludge scraper 4, its elevating range is greatly restricted by the length of the feedwell 2.

There were drawbacks such as.

The present invention eliminates the drawbacks of the conventional thickening tank described above, and the function of the feedwell is not obstructed by other equipment, even when configured to raise a sludge scraper, for example. This was proposed for the purpose of providing a thickening tank equipped with a feedwell that can maintain an appropriate length and fully demonstrate its original function. A fixed feedwell is arranged concentrically in the tank surrounding the drive shaft of the raking machine, and is attached to the drive shaft so as to be movable up and down via a support member and rotatable around the shaft. This invention relates to a concentration tank characterized in that a side wall of a movable feedwell is slidably fitted in a fluid-tight manner to a side wall of the fixed feedwell.

The present invention will be specifically explained below with reference to embodiments shown in FIGS. 2 to 4.

In these figures, 1 is a raw water inflow pipe, 3 is a frame, 4 is a sludge scraper, 5 is a hanging metal fitting, 6 is a treated water trap, 7 is a center pocket, 8 is a sludge drain pipe, 9 is a drive device, 10 11 is a drive shaft, 11 is a supernatant water outflow pipe, and 12 is a supporting metal fitting. The configuration, function, and mutual relationship structure of these members are similar to the supporting metal fitting 12 of the sludge scraper 4, as will be described later, of the movable feedwell. It is substantially the same as the conventional concentration tank described above, except that it is attached to the drive shaft 10 by penetrating the side wall obliquely.

(Equivalent parts are given the same reference numerals.

) 20 is a feedwell consisting of a fixed feedwell 20a and a movable feedwell 20b, and the fixed feedwell 20a surrounds the drive shaft 10 via a hanging hardware 5 and is supported on a frame 3 concentrically within the tank. has been carried out, and also
It is connected to the raw water inflow pipe 1.

The movable feedwell 20b is attached to the drive shaft 10 via the support member 13 so that it can move up and down in the axial direction and can rotate around the axis, so that it rotates together with the drive shaft 10. There is.

Further, the side wall of the movable feedwell 20b is fitted through the seal member 14 so as to be able to slide vertically within the wall of the fixed feedwell 20a in a fluid-tight manner.

In addition, the support hardware 1 for supporting and adjusting the mounting angle of the sludge scraper 4
2 passes obliquely through the side wall of the movable feedwell 20b and is fixed to the drive shaft 10.

One embodiment of the concentration tank of the present invention is constructed as described above, and the raw water containing solids that flows in from the raw water inflow pipe 1 is rectified in the same way as in the conventional method by the feedwell 20 consisting of the fixed feedwell 20a1 and the movable feedwell 20b. After that, the sludge that has settled and accumulated in the center pocket 7 at the bottom of the tank is discharged from the tank through the sludge discharge pipe 8, and the supernatant water that has flowed into the treated water trap 6 is sent to the next process through the outflow pipe 11. be done.

In the case of the present invention, a lifting device (not shown) for the sludge scraper 4 is attached to the drive device 9, and when the sludge scraper 4 is pulled upward by this, the movable feedwell 20b
The sludge scraper 4 can be moved from position A to position B in FIG. can be maintained at a sufficient length by the fixed feedwell 20a and the movable feedwell 20b, and therefore exhibits a sufficient rectification function.

In addition, when a floating sludge scraping machine is provided, the weight of the movable feedwell 20b is borne by the axis of the drive shaft 10, so the support frame of the floating sludge scraping machine supports the fixed feedwell 20a. Since it is only necessary to support the frame, it is possible to avoid increasing the size of the frame.

Since the concentration tank of the present invention has the above-described configuration and function, the present invention has the practical effect of realizing a concentration tank that eliminates the drawbacks of the conventional concentration tanks described above. I can do it.

Next, another embodiment of the present invention shown in FIG. 5 includes a scum skimmer 15 for collecting sludge floating on the water surface;
An example is shown in which the sludge discharge pipe 16 is provided, but in this example,
Since the fixed feedwell 30a cannot be supported by a hanging fixture, the fixed feedwell 30a is supported by a feedwell support 17 as shown in the figure, and the movable feedwell is divided into an upper movable feedwell 30c and a lower movable feedwell 30b. , both movable feedwells 30b,
30c is supported on the drive shaft 10 by the support member 13 to reduce the load on the feedwell support 17 and prevent it from increasing in size, and the thrust load applied to the drive shaft 10 is reduced by the thrust axis of the drive device 9. It is designed to bear the same burden, and has the same functions and effects as those of the above embodiment.

[Brief explanation of drawings]

Figure 1 is a schematic cross-sectional view of an example of a conventional thickening tank, Figures 2 to 4 are schematic explanatory views of an embodiment of the present invention, Figure 2 is a cross-sectional view, and Figure 3 is a sludge tank. 4 is an enlarged view of the X section in FIG. 3, and FIG. 5 is a schematic sectional view of another embodiment of the present invention. 1: Raw water inflow pipe, 3: Frame, 4: Sludge scraper, 5: Hanging fittings, 6: Treated water trap, 7: Center pocket, 8
: Sludge discharge pipe, 9: Drive device, 10: Drive shaft, 11: Supernatant water outflow pipe, 12: Support hardware, 13: Support member, 14:
Seal member, 15 Niscum clearance, 17: Feedwell support, 20: Feedwell consisting of fixed feedwell 20a and movable feedwell 20b, 30a:
Fixed feedwell, 30b: two lower movable feedwells, 30c: upper movable feedwell.

Claims (1)

[Scope of utility model registration request] A fixed fill well is arranged concentrically in the tank surrounding the drive shaft of the sludge scraper installed at the bottom of the tank, and the drive shaft is movable up and down via a support member. A concentration tank characterized in that a side wall of a rotatably mounted movable feedwell is slidably fitted in a fluid-tight manner to a side wall of the fixed field well.