JP2018202316A5

JP2018202316A5 -

Info

Publication number: JP2018202316A5
Application number: JP2017109625A
Authority: JP
Filing date: 2017-06-02
Publication date: 2019-06-27
Anticipated expiration: 2037-06-02

Description

なお、対象原液により、外筒スクリーン２はろ過面が目詰まりした時だけ、差速回転させながら洗浄してもよい。符合２０は外筒スクリーン２の下方に配設したろ液受槽、符合２１は外筒スクリーンに沿って配設した洗浄管であって、外筒スクリーン２を回転させながらろ過面の目詰まりを解消させる。
The outer cylinder screen 2 may be cleaned while being rotated at different speeds only when the filtration surface is clogged by the target stock solution. Reference numeral 20 is a filtrate receiving tank disposed below the outer cylinder screen 2 , and reference numeral 21 is a washing pipe disposed along the outer cylinder screen, and clogging of the filtration surface is eliminated while rotating the outer cylinder screen 2. Let

図２（ａ）はスクリュー羽根の背面図であって、スクリュー羽根３に開口２２を形成し、濃縮室７の最終羽根ピッチとその前段ピッチとを濃縮汚泥が通過可能に連通させている。本実施例では、スクリュー羽根３の終端部２３近傍から入口側に向かって所定位置まで連続的に同心円状に開口２２を設けており、終端部２３近傍から入口側に向かって１ピッチ分のみ開口２２を形成している。スクリュー羽根３の外周側は前段ピッチからの濃縮汚泥を必要以上に最終羽根ピッチ間に越流させないように所定の幅を有した状態としている。前段ピッチに駐留している濃縮汚泥が最終羽根ピッチに越流して減少することで、前段ピッチが排出口１１に連通解放した際に一気に排出される排出量が減少する。
FIG. 2A is a rear view of the screw blade, in which an opening 22 is formed in the screw blade 3, and concentrated sludge allows the final blade pitch of the concentration chamber 7 and the preceding pitch to pass therethrough. In the present embodiment, the openings 22 are continuously formed concentrically from the vicinity of the end 23 of the screw blade 3 to a predetermined position from the vicinity of the end to the inlet, and only one pitch is opened from the vicinity of the end 23 toward the inlet 22 are formed. The outer peripheral side of the screw blade 3 has a predetermined width so as not to overflow concentrated sludge from the front stage pitch between the final blade pitch more than necessary. When the concentrated sludge stationed at the front stage pitch overflows to the final blade pitch and decreases, the amount of discharge immediately discharged when the front stage pitch is openly connected to the discharge port 11 decreases.

また、図２（ｂ）のように、スクリュー羽根３の終端部２３近傍から入口側に向かって開口度を減少させると、最終羽根ピッチ間に越流する濃縮汚泥量を調整でき、濃縮汚泥の排出量をより均一化できる。具体的な構成としては、スクリュー羽根３の外周縁と開口２２の間の幅について、終端部２３近傍から入口側に向かって徐々に高くする。このように構成することで、前段ピッチに堆積している濃縮汚泥を貯留量に応じて徐々に最終羽根ピッチ間に越流させる。大量の濃縮汚泥が一気に開口２２を通過することがなく、開口２２の閉塞を防止できる。
Further, as shown in FIG. 2 (b), when the opening degree is decreased from the vicinity of the end portion 23 of the screw blade 3 toward the inlet side, the amount of concentrated sludge overflowed between the final blade pitch can be adjusted. The emissions can be made more uniform. As a specific configuration, the width between the outer peripheral edge of the screw blade 3 and the opening 22 is gradually increased from the vicinity of the end portion 23 toward the inlet side. With this configuration, concentrated sludge accumulated on the front stage pitch is gradually overflowed between the final blade pitches according to the storage amount. A large amount of concentrated sludge does not pass through the opening 22 at a stretch, and the closing of the opening 22 can be prevented.

図４は他の実施例のスクリュー羽根の概略側面図である。
スクリュー羽根３の終端部２３から所定位置まで２条で構成し、それぞれのスクリュー羽根３ａ，３ｂに開口２２ａ，２２ｂを形成している。本実施例では、スクリュー羽根３の終端部２３から１ピッチ分のみを２条で構成し、スクリュー羽根３の終端部２３から０．５ピッチ分のみに開口２２を設けている。
FIG. 4 is a schematic side view of a screw blade of another embodiment.
It comprises two lines from the end part 23 of the screw blade 3 to a predetermined position, and forms opening 22a, 22b in each screw blade 3a, 3b. In this embodiment, only one pitch from the end portion 23 of the screw blade 3 is formed in two, and the opening 22 is provided from the end portion 23 of the screw blade 3 only for 0.5 pitch.

図５（ａ）は他の実施例のスクリュー羽根の背面図である。
それぞれのスクリュー羽根３の終端部２３近傍から入口側に向かって所定位置まで連続的に同心円状に開口２２を設けており、終端部２３近傍から入口側に向かって０．５ピッチ分のみ開口２２を形成している。それぞれのスクリュー羽根３に開口２２を形成することで、最終羽根ピッチ間の前段に堆積する濃縮汚泥が最終羽根ピッチ間に越流する。２条羽根で最終羽根ピッチ間の長さが短くなり、越流してきた濃縮汚泥が容易に排出口１１に流下し、排出口１１から排出し易くなる。
FIG. 5 (a) is a rear view of a screw blade of another embodiment.
The openings 22 are provided continuously and concentrically from the vicinity of the end 23 of each screw blade 3 to a predetermined position from the vicinity of the end 23 to the inlet side, and the openings 22 only for 0.5 pitch from the vicinity of the end 23 toward the inlet Form. By forming the openings 22 in the respective screw blades 3, concentrated sludge deposited in the previous stage between the final blade pitches overflows between the final blade pitches. The length between the final blade pitches is shortened by the two-row blade, and the overflowed concentrated sludge easily flows down to the discharge port 11 and is easily discharged from the discharge port 11.

また、図５（ｂ）のように、スクリュー羽根３の終端部２３近傍から入口側に向かって開口度を減少させると、最終羽根ピッチ間に越流する濃縮汚泥量を調整でき、濃縮汚泥の排出量をより均一化できる。具体的な構成としては、スクリュー羽根３の外周縁と開口２２との幅について、終端部２３近傍から入口側に向かって徐々に高くする。このように構成することで、前段ピッチに堆積している濃縮汚泥を貯留量に応じて徐々に羽根最終ピッチ間に越流させることができる。大量の濃縮汚泥が一気に開口２２を通過することがなく、開口２２の閉塞を防止できる。
Further, as shown in FIG. 5 (b), when the opening degree is decreased from the vicinity of the end portion 23 of the screw blade 3 toward the inlet side, the amount of concentrated sludge overflowed between the final blade pitch can be adjusted. The emissions can be made more uniform. As a specific configuration, the widths of the outer peripheral edge of the screw blade 3 and the opening 22 are gradually increased from the vicinity of the end portion 23 toward the inlet side. With this configuration, concentrated sludge accumulated on the front stage pitch can be gradually overflowed between the blade final pitches according to the storage amount. A large amount of concentrated sludge does not pass through the opening 22 at a stretch, and the closing of the opening 22 can be prevented.

（ｃ）は一方のスクリュー羽根３ａの終端部２３ａが１８０°（真上に位置）、他方のスクリュー羽根３ｂの終端部２３ｂが０°（真下に位置）の時であって、内部の状態は（ａ）と同様である。
(C) is a is when the 180 ° termination portion 23a of one of the screw blade 3a (located on true), the terminal end 23b of the other screw blade 3b is 0 ° (located true below), internal state Is the same as (a).

（ｄ）は一方のスクリュー羽根３ａの終端部２３ａが２７０°、他方のスクリュー羽根３ｂの終端部２３ｂが９０°の時であって、内部の状態は（ｂ）と同様である。
(D) shows the end portion 23 a is 270 ° of one of the screw blade 3a, the end portion 23b of the other screw blade 3b is not more when 90 °, the internal state is the same as (b).

Claims

The opening (22) is formed such that the width between the outer peripheral edge of the screw blade (3) and the opening ( 22 ) increases from the vicinity of the end (23) of the screw blade (3) to the inlet side The concentrator according to any one of claims 1 to 4, characterized in that.