JP2013059702A - Filtration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filtration device with which an RO membrane filtration device can be made compact and reverse cleaning can be easily performed since sea water, muddy water and the like can be purified into pure water without using a flocculant or a sand filtration or the like.SOLUTION: The filtration device includes: a container having a cyclone shaped inner circumference face; a rotary cylinder with a closed lower end situated in the container; a filtration brush of a cyclone shape, having a number of brushes on an outer circumference of the rotary cylinder; and a number of small pores provided in the rotary cylinder. The treating water flowed into the container is separated into muddy water discharged from the lower side of the container and pure water flowing through the brush from small pores into the cylinder, and the reverse cleaning can be performed easily by introducing a detergent into the rotary cylinder.

Description

  The present invention relates to a filtering device that separates seawater, river water, and the like by adding a flocculant, and eliminates the need for a prefiltering device such as sand filtration, and can be repeatedly used by backwashing.

  It is known that a filtration apparatus using an RO membrane can remove radioactive substances, bacteria, metal ions in seawater, chlorine ions, and the like. However, when filtering seawater, river water, etc., a flocculant is added and stirred, the separated supernatant water is put into a cyclone, further sand filtered, and then filtered using an RO membrane. If this is not done, the RO membrane becomes unusable in about one year.

  As described above, in order to filter with the RO membrane, in actuality, many filters, tanks, pipes, etc. were required in addition to the RO membrane filter, and there was a problem that the apparatus became very large. . Moreover, the sand filter had a problem that it was very difficult to backwash, so the sand had to be replaced.

  The present invention provides seawater, river water and the like that can be made into fresh water without the need for a flocculant or sand filtration, etc., and a RO membrane filtration apparatus that can be made compact and that can be easily backwashed. For the purpose.

  The configuration of the present invention that meets the above-described object includes a container having an inner peripheral surface in a cyclone shape, a rotating cylinder having a closed lower end located in the container, and a brush composed of a number of linear objects on the outer periphery of the rotating cylinder. The cyclone-shaped filtration brush provided and a large number of small holes provided in the rotating cylinder, the water to be treated flowing into the container passes through the muddy water discharged from the lower part of the container and the filtration brush. And separating into fresh water flowing into the rotating cylinder from the small hole.

  The adjacent linear bodies of the filtration brush preferably have a thick portion and are formed so as to partially contact each other (Claim 2).

  Washing water is allowed to flow into the rotating cylinder, the rotating cylinder is rotated, and the insoluble matter adhering to the brush is blown off together with the washing water, and backwashing can be performed (Claim 3).

  The rotating cylinder is internally provided with a pipe serving as an outlet for the filtrate, the lower end of the cyclone container is formed at the drain outlet, and the liquid inlet pipe is connected to the opening of the lid at the upper end of the container. It may be configured (claim 4).

  The treated liquid introduction pipe is connected to a switching valve B. During continuous operation (at the time of filtration), the switching valve B communicates with the piping to the switching valve A, and the switching valve A communicates with the raw water inlet. The pipe that becomes the outlet of the filtrate is connected to the switching valve C, and is switched by the switching valve C so as to communicate with the filtrate outlet pipe (Claim 5).

  The pipe serving as the outlet of the filtrate is connected to the switching valve C. During backwashing, the switching valve C communicates with the switching valve B, and the switching valve B communicates with the piping to the switching valve A. Is switched by the switching valve A so as to communicate with the cleaning water inlet (claim 6).

  It is preferable that the rotating cylinder of the rotating brush is supported by bearings at the top and bottom (Claim 7). The brush is preferably formed of a large number of linear bodies having a diameter of 0.3 mm to 1.0 mm (Contract 98). It is preferable that a large number of small holes formed between the linear bodies of the rotary cylinder have a diameter of 0.5 to 1 mm.

  According to the present invention, due to the principle of cyclone and centrifugal separation, a heavy object moves outward and downward, and a gap formed by deforming and laminating thin linear bodies cannot pass granular materials. Only the fresh water that has passed through the gap can be separated from the small hole of the rotating cylinder, and the insoluble matter adhering to the brush can be easily removed by backwashing. Therefore, the life cycle of this filtration device is extremely long. Have advantages.

It is sectional drawing which shows switching valve operation at the time of continuous driving | operation with the apparatus of this invention. It is sectional drawing which shows switching valve operation at the time of automatic washing | cleaning with the apparatus of this invention. It is a top view at the time of driving | operation of the apparatus of this invention. It is a top view at the time of the washing | cleaning process of the apparatus of this invention. It is sectional drawing which shows the state currently filtered with the apparatus of this invention. FIG. 6 is a cross-sectional view taken along the line AA in FIG. 5.

1 Cyclone-shaped container 2 Filtration brush 3 Small hole (suction hole)
4 Rotating cylinder 10 Pipe for taking out filtered water 13 Liquid to be treated introduction pipe

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view showing an embodiment of the present invention. A rotating cylinder 4 having a plurality of small holes (suction holes) 3 and closed at a lower end is provided in a cyclone-shaped container 1 attached to a gantry. Decorated. A filter brush 2 made of a large number of thin linear bodies (diameter 0.7 mm) is provided on the outer periphery of the rotating cylinder 4 so that adjacent linear bodies are partially in contact with each other. The outer periphery of the filtration brush 2 is also formed in the same cyclone shape as the inner surface of the container.

  The lower end of the rotating cylinder 4 is supported by a rotating shaft fixed bearing, and the upper part is supported by a bearing 6 fixed to the lid 5 of the cyclone container 1. The rotary shaft fixed bearing is fixed to a support plate 7 through which a fluid fixed to the lower part of the cyclone-shaped container 1 can pass. The lower end of the cyclone-shaped container 1 is formed at the drain outlet of muddy water separated from fresh water.

  A short cylindrical body 9 having a mechanical seal is continuously provided in a lid 8 at the upper end of the rotating cylindrical body 4, and a pipe for taking out filtrated water is provided in the upper metal fitting and the lower lid 8 of the short cylindrical body. 10 penetrates and the pipe 10 reaches below the center of the rotating cylinder 4. The pipe 10 is preferably located slightly below the center in the rotating cylinder 4 because the amount of fresh water remaining when the pipe 10 is stopped can be reduced. The upper end of the pipe 10 is connected to a switching valve C (three-way valve). The switching valve C is switched so as to connect the pipe 10 to the filtered water outlet pipe 11 during continuous operation.

  A large gear 12 is fixed to the outer periphery of the short cylinder, and the large gear 12 meshes with a gear fixed to the rotation shaft of the rotation control motor.

  The rotation control motor is fixed to a motor support fixed on the lid of the container 1, and an inlet for water to be treated is formed in the lid 5. And is connected to a switching valve B (three-way valve). During operation, the switching valve B is switched so as to connect the liquid to be treated introduced pipe 13 to a pipe to the switching valve A (three-way valve).

  The switching valve A can be switched between the raw water inlet and the wash water inlet, but is switched to communicate with the raw water inlet during operation. When the switching valve A is switched as shown in FIG. 1, the switching valve B and the switching valve C are naturally switched as shown in FIG.

  Since it is configured as described above, during operation, the switching valve A communicates the raw water inlet and the piping, and the pump driven by the motor passes the raw water through the piping and from the switching valve B to the cyclone-shaped container. The filter brush is rotated at a high speed by rotating the rotating shaft at high speed via a gear with a motor, and the insoluble matter is moved downward and deformed by the principle of cyclone and centrifugal separation. Only the fresh water that has passed so as to penetrate the gap between the brushes flows out from the switching valve C to the filtrate outlet through the suction hole 3 of the rotating cylinder.

  FIG. 3 is a plan view showing a state during operation. As for the muddy water outlet, a pipe serving as a muddy water outlet is connected to the drain outlet of FIG. The water to be treated is introduced from the raw water inlet into the container in which the filtration brush is rotated by a rotating cylinder through a gear with a motor, and the water to be treated is separated into filtered water and muddy water by the filtration brush. Is.

  FIG. 2 shows a state where automatic cleaning is performed by switching the switching valve during automatic cleaning by a timer.

  Since the piping is switched to communicate with the cleaning water inlet by the switching valve A, the cleaning water is sent to the switching valve B through the piping by a pump driven by a motor. The switching water is switched by the switching valve B so as to communicate with the pipe 14 sent to the switching valve C, and the cleaning water is switched by the switching valve C so as to communicate with the pipe 10 in the rotating cylinder. Accordingly, the cleaning water flows into the cylinder that rotates at high speed via the gears by the motor, but the flowing cleaning water passes through the small hole (suction hole) 3 of the cylinder together with the insoluble matter from the filter brush 2. Erupt vigorously. Wash water mixed with insoluble matter is discharged from the drain outlet.

  In the above-described embodiment, the rotating cylinder 4 is formed in a shape in which a large-diameter cylinder is disposed on the outer periphery of a small-diameter cylinder, an air chamber is formed therebetween, and the upper and lower air chambers are closed. Has been. This is not necessarily the case, and a rotating cylinder having a single cylinder structure may be used.

  FIG. 4 is a plan view showing a state during the cleaning process. The raw water inlet is in a stopped state, and the washing water from the washing water inlet flows into the rotating cylinder that is rotating through the gear by the motor, and the washing water adheres to the brush from the rotating brush. It is ejected together and removed from the muddy water outlet as muddy water.

  FIG. 5 shows another embodiment of the present invention, wherein the lower end of the rotary pipe is supported by a bearing fixed to a support member 15 fixed to the bottom, and the upper part is supported by a bearing fixed to the lid 5. doing. Of course, the support member 15 has an opening through which muddy water passes.

  A mechanical seal is attached to the upper end of the rotary pipe, and a holding metal fitting is fixed to the upper end. A pipe 10 is inserted into the holding metal fitting and the mechanical seal, and the pipe 10 is positioned below the center of the rotary pipe.

  The fresh water filtered through the gap of the filtration brush flows from the suction hole (small hole) 3, moves as indicated by the arrow, and flows out from the pipe 10 to the filtered water outlet.

  FIG. 6 is a cross-sectional view of FIG. 5, but the adjacent brushes are formed in a rounded shape with a thick central portion that comes into contact. It is particularly preferable to form a taper shape toward the tip, for example, a fan shape. In short, it is preferable to have a shape in which adjacent brushes are easily in contact with each other. Even if some of the adjacent brushes are not completely in contact with each other, the linear body may fall down due to the rotation as long as it is in the proximity state. The close state is preferably a gap of 3 mm or less, particularly preferably 2 mm or less at the linear body fixing portion. Since the suction hole (small hole) 3 is formed between the linear body and the linear body, a gap of about 1 mm is required at the linear body fixing portion.

  The thickness of the brush is preferably 0.5 mm to 1 mm. If it is too thick, it will be difficult to completely separate the insoluble matter. In the case of the shape shown in FIG. 6, it is preferable that the thickness of the thin portion of the fixed portion be within this range.

  In this embodiment, a nylon brush is used, but it is preferably formed of fibers or fibrous members. The material of the brush can be metal as long as it can be 0.5 mm to 1 mm.

  The switching between the switching valve during continuous operation in FIG. 1 and the switching valve during automatic cleaning in FIG. 2 may be appropriately set with a timer for several hours depending on the liquid to be treated.

  The filtration device of the present invention is suitable for use as a pre-filtration device such as RO membrane filtration, but depending on the water to be treated, this filtration device can be used alone.

By using the filtration device of the present invention, treatment with a flocculant or sand filtration can be made unnecessary. Therefore, a filtration device using an RO membrane can be made very compact and repeatedly used by backwashing. It is also excellent in terms of economy.

Claims (10)

A cyclone-shaped container having an inner peripheral surface, a rotating cylinder having a closed lower end located in the container, a cyclone-shaped filtering brush provided with a brush composed of a number of linear bodies on the outer periphery of the rotating cylinder, A large number of small holes provided in the rotating cylinder, and the water to be treated flowing into the container flows into the rotating cylinder from the small holes through the muddy water discharged from the lower part of the container and the filtering brush. Filtering device that separates into fresh water. The filtration apparatus according to claim 1, wherein the adjacent linear bodies of the filtration brush have a thick portion and are partially in contact with each other. The filtration device according to claim 1 or 2, wherein washing water is allowed to flow into the rotating cylinder, the rotating cylinder is rotated, and the insoluble matter adhering to the brush is blown off together with the washing water to perform back washing. A pipe that serves as an outlet for the filtrate is provided in the rotating cylinder, the lower end of the cyclone-shaped container is formed at a drain outlet, and the liquid inlet pipe is connected to the opening of the lid at the upper end of the container. The filtration apparatus in any one of 1-3. The treated liquid introduction pipe is connected to a switching valve B. During continuous operation (at the time of filtration), the switching valve B communicates with the piping to the switching valve A, and the switching valve A communicates with the raw water inlet. The filtration device according to claim 4, wherein the pipe serving as the outlet of the filtrate is connected to a switching valve C and is switched by the switching valve C so as to communicate with the filtrate outlet pipe. The pipe serving as the outlet of the filtrate is connected to the switching valve C. During backwashing, the switching valve C communicates with the switching valve B, and the switching valve B communicates with the piping to the switching valve A. Is switched so as to communicate with the cleaning water inlet by a switching valve A. The filtration device according to any one of claims 1 to 6, wherein the rotary cylinder of the rotary brush is supported by bearings at the top and bottom. The said rotary brush is a filtration apparatus in any one of Claims 1-7 formed with many linear bodies with a diameter of 0.3-1 mm. The said linear body is a filtration apparatus in any one of Claims 1-8 formed with a fiber or a fibrous member. The filtration device according to any one of claims 1 to 9, wherein a number of small holes formed between the linear body and the linear body of the rotating cylinder have a diameter of 0.5 to 1 mm.

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