JPH0116497Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a filtering drum-type screen used in human waste processing equipment and the like.

(Prior art) Conventionally, as a system for treating sludge liquid such as human waste water, impurities are filtered and separated by supplying the sludge liquid to the inside of a rotating drum type screen, and the impurities are compressed and dehydrated. There is a sludge treatment facility that incinerates the filtrate while appropriately purifying the filtrate.

Various types of filtration devices have been proposed in the past (for example, Utility Model Application No. 52-7477, Japanese Unexamined Patent Publication No. 7477)
No. 52-56452, No. 52-10971 and Special Publication No. 55-
50690, etc.), and its basic configuration is as shown in FIG. In the figure, reference numeral 31 denotes a filtering drum-type screen, which has a large number of finely-opened slits formed in the vertical or horizontal direction and rotates at a low speed. The sludge water to be treated is ejected from the supply pipe 32 onto the upper inner wall surface of the drum-shaped screen 31, and the filtered impurities 33 fall to the bottom of the drum while being rounded as the drum rotates, and then exit from the discharge port 34. It is beginning to be excreted. Note that 35 is a cleaning water jet nozzle for cleaning the screen surface from the outside, 36 is a cover, and 37 is a filtrate discharge port.

In the above-mentioned drum-type screen, if the drum length is short, contaminants are discharged from the discharge port, but if multiple drums are connected to increase processing capacity, contaminants accumulate at the bottom of the drum. This means that it will not be discharged outside.
Moreover, even if the drum were discharged from the discharge side opening, the foreign matter would be scattered due to the large diameter of the drum, resulting in the disadvantage that the discharge chute would have to be opened wide.

(Purpose of the invention) The purpose of the invention is to eliminate the drawbacks of the conventional filtration devices described above, and to provide a drum screen type filtration device in which impurities are automatically discharged as the drum screen rotates. It's about doing.

(Structure of the invention) The drum screen type filtration device according to the invention includes:
In a filtration device, a filtration screen having a large number of slits is formed into a drum shape, and impurities are filtered and separated by rotating the filtration screen and supplying a processing liquid from inside. A truncated cone-shaped discharge drum is attached to the discharge side opening of the drum, and a truncated cone-shaped discharge drum is attached to the discharge side opening of the drum. It is equipped with screw blades.

Therefore, since the slits formed on the inner peripheral surface of the drum have a bias shape, the foreign matter inside the drum is transported toward the discharge side opening of the drum as the drum rotates, and further rotates together with the drum. Once it enters the discharge drum, it is accurately conveyed toward the discharge port by screw blades provided on the inner surface and discharged.

(Example) An example of the drum screen type filtration device according to the present invention will be described based on FIGS. 2 to 9.
In the figure, 1 is a large number of slits 2 similar to the conventional one.
However, in the present invention, the slits 2 on the inner peripheral surface of the drum are arranged in a biased manner so that foreign substances are conveyed toward the discharge side opening. A truncated cone-shaped discharge drum is attached to the section, and screw blades are provided on the inner peripheral surface of the drum.

To specifically explain the above-mentioned structure, the drum-shaped screen 1 is constructed by winding a screen member 3 formed in the shape of a screen into a drum shape, and this screen member 3 has a triangular cross section arranged in large numbers. Holding the top of the wedge wire 4, the wire 5
Therefore, the wedge wire 4 is arranged so that its bottom side 4a forms the inner surface of the drum. For this reason, the slit 2 has a substantially triangular cross section that widens outward, thereby preventing clogging.

Screen member 3 formed as described above
It is wound into a drum shape with the slit 2 diagonally formed on the inner circumferential surface of the drum (60 degree angle in the example), and the joining edges are joined by the joint rod 6, and both opening edges are The flange 7,
The drum-shaped screen 1 is constructed in such a way that it is held at 7. In addition, 8 is the above-mentioned flange 7, 7
The ribs are placed in between.

A truncated cone-shaped discharge drum 9 is attached to the exit side opening of the drum-shaped screen 1 so as to rotate together with the drum-shaped screen 1, and screw blades 1 having the same direction as the slits 2 are attached to the inner wall of the discharge drum 9.
0 is set. As a result, the impurities pushed through the bias-shaped slit 2 are conveyed by the screw blades 10 to the exit 9a.
From there, it will be discharged via the discharge skirt 11.

Although the number and spacing of the screw blades 10 should be determined depending on the processing capacity based on the drum diameter, drum length, etc., two blades were provided in the embodiment. In the figure, 12 is a tank in which the drum-shaped screen 1 is to be placed, 13 is a drain pipe provided at the bottom of the tank, 14 is a treatment liquid input pipe, 15 is a supply dam, and 16 is a tank in which the drum screen 1 is placed. A support roller for rotatably supporting the mold screen 1, 17 a drive source for rotating the support roller 16 via a belt 18, 19 a tension sprocket, 20 a cleaning water supply nozzle, and 21 various parts. Each inspection window is shown in the figure.

Next, to explain an example of operation, the drum-shaped screen 1 configured as described above is rotated via a support roller 16 that is rotationally driven by a drive source 17.
When the liquid to be treated is jetted and supplied to the upper inner circumferential surface of the drum screen 1, it is filtered by the slit 2 and the filtrate is discharged through the drain pipe 13. However, the impurities are rolled up by the inner wall surface of the drum-shaped screen 1 and flow to the bottom. It will grow. In this case, since the contaminants include fibers, the fibers are engaged with the slits 2, and since the slits 2 are biased, the screen is removed as the drum-shaped screen 1 rotates. It functions as a Yukon conveyor, and the contaminants are conveyed toward the exit (leftward in FIGS. 6 and 8). A discharge drum 9 is attached to the tip side of the drum-shaped screen 1.
Since a screw blade 10 is provided on the inner peripheral surface of the drum, foreign matter is transported by the screw blade 10, and since the discharge drum 9 is tapered, foreign matter is collected. It is discharged from the outlet 9a to the discharge skirt 11 while being blown.

(Effect of the invention) According to the drum screen type filtration device according to the present invention, since the slits on the inner peripheral surface of the drum have a bias shape, contaminants are rounded off at the bottom of the drum as the drum screen rotates. Moreover, since a truncated cone-shaped discharge drum having screw blades on the inner circumferential surface is attached to the opening side of the drum,
As the discharge drum rotates, foreign matter can be accurately conveyed to the exit side, and since the outlet of the discharge drum is tapered, the foreign matter is rolled up and discharged, preventing the foreign matter from being scattered. There is no risk of it happening.

[Brief explanation of drawings]

FIG. 1 shows a conventional drum screen type filtration device, in which FIG. 1A is a sectional view and FIG. 1B is a sectional side view. 2 to 9 show an embodiment of the drum screen type filtration device according to the present invention, FIG. 2 is a developed view of the screen member, FIG. 3 is a partially enlarged view of the screen member, and FIG. A is a plan view, B is the same as above.
is a side view, C is another side view, FIG. 4 is a partially sectional plan view of the drum-type screen, FIG. 5 is a side view of the same as above, FIG. 6 is a partially removed sectional front view, and FIG. A side view, FIG. 8 is a partially sectional front view of the entire device,
FIG. 9 is a side view of the same as above. 1: Drum-shaped screen, 2: Slit, 3:
Screen member, 4: wedge wire, 5: holding wire, 6: joint rod, 7: flange, 8: rib, 9: discharge drum, 10: screw blade.

Claims (1)

[Claims for Utility Model Registration] A filtration device in which a filtration screen having a large number of slits is constructed in the form of a drum, and impurities are filtered and separated by rotating the screen and supplying a processing liquid from inside. The slits are arranged in a biased manner on the inner peripheral surface of the drum so that foreign matter is conveyed toward the discharge side opening, and a truncated cone-shaped discharge drum is provided at the discharge side opening of the drum. A drum screen type filtration device, characterized in that it is attached and has screw blades provided on its inner peripheral surface.