JP3652430B2 - Filtration dehydrator - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a filter dehydrator for separating solids, particularly suspended solids (SS), contained in a liquid, and concentrating and dewatering the separated solids.
[0002]
[Prior art and its problems]
A slit groove is provided between each of a large number of rotating plates fitted to the rotating shaft, and a filtrate outlet for taking out the liquid in the stock solution flowing into these slit grooves into the filtrate chamber outside the processing tank. In the direction in which a plurality of established filter elements are adjacent to each other and in which the plates are inserted into each other's slit groove, the liquid to be treated supplied from the stock solution supply port is guided to the solids discharge port. A filter dehydrator of the type that performs filtration and dehydration by extracting the filtrate from the filtrate take-out path to the filtrate chamber while rotating each filter element is known.
[0003]
The biggest problem with this type of filter dehydrator is that the filtration extraction path and the flow hole formed in the side wall facing the filter take-off channel are likely to be clogged with solids, and there is no means for removing it. Is impeded and the solid-liquid separation action cannot be achieved.
[0004]
The filtrate chamber is usually attached to one side of the processing chamber. In order to solve the above problems, a filtrate chamber is provided on both sides of the processing tank, and the communication hole leading to one of the filtrate chambers is blocked with solid matter. On the other hand, there is a configuration in which the solid-liquid separation operation is continued by the filtrate extraction function into the filtrate chamber. However, this configuration naturally increases the size and cost of the filtration dehydrator, and if the communication holes on both side walls are clogged or the filtrate outlet is clogged, solid-liquid separation work is not performed at all. It will not be broken.
[0005]
OBJECT OF THE INVENTION
The purpose of the present invention is to remove the clogging of the filtrate extraction path of the filter element and the filtrate chamber in the treatment tank when the clogging is caused by the solid-liquid material, and for the solid-liquid separation work in the treatment tank. An object of the present invention is to provide a filter dehydrator that does not cause trouble and does not cause an increase in size and cost.
[0006]
[Structure of the invention]
In the filtration dehydrator according to the present invention, a slit groove is provided between each plate of a large number of rotating plates fitted on the rotating shaft, and the liquid content in the stock solution flowing into these slit grooves is discharged out of the treatment tank. A plurality of filtration elements formed by opening a filtrate extraction path for taking out in the axial direction have a stock solution supply port and a solid content discharge port according to a contact state in which plates are inserted into each other's slit groove. Filtration dehydration is performed by sequentially extracting the filtrate from the filtrate outlet to the outside of the tank while rotating each filter element in a direction that is sequentially arranged in the treatment tank and guiding the liquid to be treated supplied from the stock solution supply port to the solid content discharge port. in filtration dehydrator to perform, along with the one side wall outer surface of the treatment tank annexed filtrate chamber communicating with the filtrate take-out path via a through hole, to open a filtrate discharge passage is derived from the lower bottom portion to the outdoor , Opening from the filtrate chamber to the filtrate outlet The injection nozzle is connected to a feed pipe led from the pressure water generating pump, and the other side wall has a liquid suction hole concentrically facing the filtrate outlet and a treatment tank at a position separated from the liquid suction hole. A reflux hole opened inward was disposed, and both the holes were communicated at the bottom of the hole.
[0007]
【Example】
Hereinafter, description will be made with reference to the drawings of the embodiments.
[0008]
Reference numeral 1 denotes a treatment tank, which has a stock solution supply port 2 on its upper wall and a solid content discharge port 3 on its rear end wall. Reference numerals 4... 4 denote a large number of filter elements arranged in two rows so as to sandwich the solid content discharge ports 3 from above and below in the treatment tank 1, and annular plates 5 arranged in a laminated manner at a required interval. The center hole of 5 is fitted to the rotary shaft 6 and the slits 7... 7 are held between the plates 5. These many filter elements 4... 4 are sequentially arranged in an intersecting state in which the plates 5... 5 that are adjacent to each other in the front and rear are inserted into the corresponding slit grooves 7. Each plate 5... 5 is concentric so as to pass through the filtrate take-out path 8... A through hole is formed in a shape. 9 ‥‥ 9 is communicating hole formed on one side wall of the treatment tank 1 so as to face the filtrate take-out passage 8 ‥‥ 8, 10 is the filtrate take-out through the communication hole 9 ‥‥ 9 outside the one side wall A filtrate chamber provided so as to communicate with the passages 8... 8 , a filtrate discharge passage 11 opened so as to lead out from the lower bottom of the filtrate chamber 10, and a filtrate discharge passage 8 from the filtrate chamber 10. This is an injection nozzle that is open toward the front, and is connected to the tip of the feed pipe 14 that is led out from the pressure water generation pump 13. A valve 15 is attached to the feed pipe 14 so as to open and close the flow path from the pressure water generating pump 13 to the injection nozzle 12. The inner surface of the other side wall of the treatment tank 1 is provided with a liquid suction hole 16 concentrically facing the filtrate outlet path 8 and a reflux hole 17 opened into the treatment tank 1 at a position separated from the liquid suction hole 16. These holes 16 and 17 communicate with each other at the bottom of the hole.
[0009]
[Action]
The stock solution supplied from the supply port 2 into the processing tank 1 is successively concentrated and filtered by the rotating filter elements 4... 4, and the filtrate is discharged from the filtrate outlet 8. The solid matter having a low water content discharged from the passage 11 is discharged from the solid content outlet 3. When clogging occurs in the communication holes 9... 9 and the filtrate outlet 8... 8, pressure water is injected from the injection nozzle 12 and the clogging is removed by the cleaning action. The pressure water that has passed through the filtrate take-out path 8 of the filter element 4 from the communication hole 9 does not stop by striking the other side wall, passes through the liquid suction hole 16, passes through the reflux hole 17, and enters the treatment tank 1. As a result, the flow rate increases and an effective cleaning action occurs.
[0010]
【The invention's effect】
According to the present invention, even if clogging occurs in the communication hole to the filtrate chamber or the filtrate extraction path of the filter element, the clogging can be removed by a strong cleaning action by pressure water, and therefore, in the treatment tank. Therefore, it is possible to provide a filtration dehydrator that does not require an increase in size and cost, without requiring that a filtrate chamber be provided on both sides of the treatment tank.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a filter dehydrator according to the present invention.
2 is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Processing tank 2 Raw material supply port 3 Solid content discharge port 4 Rotating plate 5 Filtration element 6 Rotating shaft 7 Slot groove 8 Filtrate discharge path 9 Communication hole 10 Filtrate chamber 11 Filtrate discharge path 12 Injection nozzle 13 Pressure water generating pump 14 Feeding Tube 16 Absorption hole 17 Reflux hole

Claims (1)

Filtrate extraction path for taking out the liquid content in the stock solution flowing into these slit grooves in the axial direction outside the processing tank by providing a slit groove between each plate of a large number of rotating plates fitted on the rotating shaft. A plurality of filter elements formed by adjoining each other are sequentially arranged in a treatment tank having a stock solution supply port and a solid content discharge port, in an intersecting state in which the adjacent ones are fitted with each other into a slit groove of the partner, In a filtration dehydrator that performs filtration and dewatering by extracting the filtrate from the filtrate outlet to the outside of the tank while rotating each filter element in a direction to guide the liquid to be treated supplied from the stock solution supply port to the solid content discharge port. A filtrate chamber communicating with the filtrate take-out path through a communication hole is provided on the outer surface of one side wall of the tank, and a filtrate discharge path leading out of the bottom from the bottom is opened and directed from the filtrate chamber to the filtrate take-out path. Pressure water is generated at the spray nozzle Connected to a feed pipe led from the pump, and on the other side wall, a suction hole concentrically facing the filtrate outlet and a reflux hole opened into the treatment tank at a position separated from the suction hole And a filter dehydrator characterized in that these holes communicate with each other at the bottom of the hole.

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