JP3889612B2 - Screw type filter dehydrator - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a suspension containing suspended fine particles generated in a relatively small-scale sewage treatment operation represented by an oxidation ditch method, etc., in a low concentration state without passing through a concentration step, and the filtrate and suspended fine particles. The present invention relates to a screw-type filtration and dehydration device for separation into two.
[0002]
[Prior art and its problems]
As shown in FIG. 4, the annular filtration plate 102 and the annular movable plate 103 that are opposed to each other through a slit form a set of filtration elements, and a large number of sets of the filtration elements are laminated with a gap between each other. A screw type filtration dehydration apparatus in which a screw conveyor 111 is fitted in a central hole 110 of a cylindrical filter body 107 having the slits as separation water outflow grooves 106 by arranging them in a known manner is already known.
[0003]
However, in the above conventional screw type filtration dehydration apparatus, the opening width T in the front-rear direction of the raw water supply flow outlet 116 is opened over the length of one pitch or more of the spiral blade 111B of the screw conveyor 111 just below the supply flow lower opening. Therefore, the spiral blade 111B becomes a state X like a wave-breaking plate in the vicinity of the inlet 108 and inhibits the flow of the sludge raw water. Will overflow from the hopper 115.
[0004]
OBJECT OF THE INVENTION
The object of the present invention is to provide a screw-type filtration and dehydration device in which raw sludge water introduced from a hopper is easily fed into the center hole of the filter body through the feed port, and is smoothly filtered and dehydrated without overflowing from the hopper. Is to provide.
[0005]
[Structure of the invention]
In the screw type filtration dewatering device according to the present invention, the annular filtration plate and the annular movable plate that are opposed to each other through a slit form a set of filtration elements, and a large number of sets of the filtration elements are separated from each other by a slit. Are formed in a cylindrical filter body with the above slits as separation water outflow grooves, and the start opening of the filter body is used as a feed inlet for sludge raw water and the terminal opening is used as a feed for dehydrated cake. As a mouth, in a screw type filter dewatering device in which a screw conveyor in which a spiral blade whose pitch is gradually reduced from the feed port toward the feed port is fitted in the center hole of the filter body is fitted, from the opening at the start end of the hopper The opening width in the front-rear direction of the reduced raw water supply flow outlet is set to a length less than 1/2 pitch of the spiral blades of the screw conveyor immediately below the supply flow outlet.
[0006]
【Example】
The embodiment will be described below with reference to FIGS.
[0007]
Reference numeral 1 denotes a set of filtration elements in which an annular filtration plate 2 and an annular movable plate 3 are arranged with a gap therebetween, and a large number of sets of the filtration elements 1 are separated from each other by spacers 4. Are formed in a cylindrical filter body 7 having separated slits 6... 6 as the separated water outflow grooves 6. The starting end opening of the filter body 7 serves as a feed port 8 for raw sludge raw water, and the end opening serves as a feed port 9 for dehydrated cake, and the central blade 10 has a spiral blade 11B whose pitch gradually decreases from the feed port 8 toward the feed port 9. Is installed. The screw conveyor 11 is driven by a prime mover 12 to transfer suspended fine particles, and in conjunction with this, the annular movable plate 3... 3 is shaken eccentrically and the separated liquid outflow groove 6. Prevent clogging. The pitch of the spiral blade 11B wound around the outer periphery of Kokoro杆11S of the screw conveyor 11 is gradual in the portion close to the feed opening 8, the portion close to the delivery port 9 are formed in decreasing pitch so as to be dense, hopper The screw conveyor is formed so as to be particularly gentle in a portion located immediately below the raw water supply flow outlet 16 reduced from the starting end opening of 15, and the opening width in the front-rear direction of the raw water supply flow outlet 16 is just below the supply flow lower opening 16. 11 spiral blades 11B are set so as to be substantially within a length of less than ½ pitch. Further, with respect to the operation of the annular movable plate 3... 3, the inner diameter of the annular movable plate 3... 3 is formed to be slightly smaller than the outer diameter of the thread of the screw conveyor 11. A known method may be used in which the annular movable plates 3... 3 perform an eccentric motion directly by rotation, or an eccentric rotating shaft 13 driven in conjunction with the screw conveyor 11 as shown in FIG. Although the novel system of shaking the annular movable plate 3... 3 by sliding contact with the outer periphery of the annular movable plate 3... 3 is not the main point of the present invention. Not detailed. Reference numeral 14 denotes a discharge pressure adjusting valve attached to the delivery port 9.
[0008]
【The invention's effect】
According to the screw conveyor type filtration dewatering device in which the spiral blade 11B whose pitch gradually decreases from the feed port 8 to the feed port 9 of the present invention, the opening width T in the front-rear direction of the raw water supply flow lower port 16 is since setting of rail to the length of less than half the pitch of the spiral blade 11B of the screw conveyor 11 immediately below the supply flow down port 16, since the factors that could hinder the flow of sludge raw water near the infeed opening 8 is not present, sludge raw water thrown from the hopper 15 is fed quickly into the center hole 10 of the filtration Kakarada 7 to easily pass through the feeding port 8 from the feed falling port 16, in the process of moving toward the direction of the delivery port 9 The filtration and dehydration action is effectively performed by the volume squeezing by the spiral blade 11B whose pitch is gradually reduced toward the delivery port 9 of the screw conveyor 11.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view schematically showing the configuration of a screw-type filter dehydrator according to the present invention.
FIG. 2 is a front view of a filter element in the device of the present invention.
FIG. 3 is a longitudinal side view of a filtration element mounted on a filtration unit in the device of the present invention.
FIG. 4 is a longitudinal side view schematically showing a configuration of a conventional screw type filtration dehydration apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Filtration element 2 Annular filtration plate 3 Annular movable plate 6 Separation water outflow groove 7 Filter body 8 Delivery port 9 Delivery port 10 Center hole 11 Screw conveyor 11B Spiral blade
15 Hopper 16 Supply flow lower port T Opening width in the front-rear direction Ph Length of 1/2 pitch of spiral blade

Claims (1)

An annular filtration plate and an annular movable plate, which are opposed to each other with a slit, form a set of filtration elements, and a plurality of sets of the filtration elements are arranged in a stacked manner with a gap between each other. It is formed in a cylindrical filter body having a gap as a separation water outflow groove, the starting end opening of the filter body is used as a feed inlet for sludge raw water, and the end opening is used as a delivery port for dehydrated cake. In a screw-type filtration and dewatering device fitted with a screw conveyor wound with spiral blades whose pitch gradually decreases from the inlet port toward the outlet port, the front and rear direction of the raw water supply downflow port reduced from the opening at the start of the hopper The screw-type filtration and dewatering device is configured such that the opening width of the screw is set to a length less than ½ pitch of the spiral blades of the screw conveyor immediately below the supply flow lower opening.

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