JPS62180716A - Filter having cleanup mechanism of filter medium - Google Patents

Abstract

PURPOSE:To perform both the cleanup of a filter medium and the discharge of filter cake in an in-line process by scraping down filter cake collected by the filter medium by means of a brush which is subjected to the reciprocatively rotating motion at <360 deg. angle in the inside of a filter drum. CONSTITUTION:Raw liquid introduced into the inside of a filter drum 2 wherein the seal between the raw liquid and filtrate is performed by a discoid contact- frictional plate 9 is passed through a filter medium of the filter drum 2 and filtered and thereafter discharged through the gap between an outer drum 1 and the filter drum 2. On the other hand, filter cake collected on the filter medium is scraped down by a brush 3 and stored in a reservoir 8 for filter cake. Since the brush 3 is not rotated around all circumferences of the filter drum 2 but reciprocatively rotated while leaving one part, the filter cake scraped by the brush 3 is collected to the left part of the filter drum 2 in a period of contrarotation and dropped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a filter tube in which a filter medium such as a wire mesh is stretched inside a cylindrical support material, and suspended substances in a liquid are filtered with this filter, and filter slag collected by the filter medium is filtered. relates to a filter having a mechanism in which cleaning of the filter medium and discharge of filter slag can be done in-line by scrubbing with a brush inside the filter cylinder that reciprocates and rotates at an angle of 360 degrees.

Conventional filtering machines that regenerate filter media in-line can be cleaned using the following methods.

(1) Cleaning method using fluid ■ A method in which liquid or gas flows backward from the opposite side of the filter medium to peel off the filter slag.

■A rectangular shape that washes away filter slag with the flow of liquid.

■Method of removing filter residue by dissolving it using a solvent or heating.

(2) Mechanical cleaning method - Scrape off the filter slag by scraping the surface of the filter medium with a scraper.

■A method of scraping the gaps between multilayer plates or lattice-shaped filter media with a plate-shaped or rod-shaped blade.

■A method of applying external force such as vibration or rotation to the filter medium to peel off the filter slag.

■A method of dispersing and peeling off filter cake using ultrasonic waves.

Here, the disadvantage of method (1) is that high pressure or large volume is required for the backwashing liquid or gas, and if some filter dregs remain, it is difficult to completely regenerate that part.

In addition, the filtrate and filter cake are remixed, resulting in a lower discharge concentration and an increased amount, resulting in increased loss. If it is a gas, it may be mixed into the liquid.

Next, the disadvantage of method (2) is that when a scraper or blade is used, particles need to be collected only on the surface of the filter medium. That is, if it is attempted to scrape out something that has gotten into the filter medium, there are restrictions on the shape of the filter medium. The method of applying an external force and the method of using ultrasonic waves require separate equipment to be attached, and the mechanism including the seal becomes complicated.

Therefore, they were mostly used for removing relatively hard suspensions in low viscosity liquids, such as sand in well water or scale in oil. Recently, there have been expectations for a simple filter that filters out unreacted waste in high viscosity liquids, but it has been discovered that cleaning the filter media with conventional filters is difficult, so a new method has been developed that uses a brush to scrub the filter material. was invented.

The structure will be explained below.

A stock solution inlet 6, a filtrate outlet 7, and a filtrate reservoir 8 are attached to the outer cylinder 1, and a drive device or a hand-cranked handle 5 and a shaft sealing part of a rotating shaft 4 are attached thereon.

Next, the supporting material such as the porous holes 1& is formed into a cylindrical shape, and a filter material such as a wire mesh is placed inside the support material to form a filtration cylinder 2. Although either the cylindrical shape 2 or the conical shape 10 can be used as the filter cylinder, it is more efficient and preferable to use the conical shape. In the filter cylinder, a disc-shaped friction plate 9 seals the raw liquid and the filtrate. Brush 3 is
A spiral shape is preferable, and one or more of them are attached to the rotating shaft 4. Therefore, the stock solution entering the filter tube 2 is filtered through the filter material of the filter tube, and is discharged from the gap between the outer tube 1 and the filter tube 2.

On the other hand, the filter dregs collected on the filter medium is scraped off by the brush 3 and collected in a filtration dregs pool 8.

Since the brush 3 does not rotate around the entire circumference of the filter cylinder, but rotates it reciprocatingly except for a part, the filter slag scraped off by the brush 3 at the time of reversal is collected on the remaining filter cylinder part and falls.

That is, the present invention is a method for cleaning a filter medium that is characterized in that, in addition to picking up filter slag by the reciprocating motion of the brush 3, by leaving a part of the filter cylinder uncleaned, the filter slag is collected on this surface. It is a filter with a mechanism. Incidentally, the case shown in FIG. 3 in which two or more sets of filter cylinders 2 or 10, rotating shaft 1, etc. are incorporated in one outer cylinder is implemented in exactly the same manner and is included in the present invention.

□ The present invention will be explained below with reference to Examples □.

(Example>11 □ Using the filter shown in Figure 1, the viscosity was 1000 to 120□0O.
When a 70meSh wire mesh was used as a filter material for a synthetic resin adhesive mixed with CPS's heavy carbonate powder, coarse calcinyl carbonate, solidified resin, and soft solidified particles were found. All the resin lumps etc. in the middle could be completely filtered.

Even if the filter body is regenerated repeatedly, it will be completely reproduced and will not be disassembled and cleaned for one year (even if it is used, there will be no increase in pressure loss, abrasion or damage to the filter medium, etc.). I couldn't see it.

In these series of experiments, the shape and material of the brush should be selected depending on the type of filter medium, and if the selection is correct, deformation and wear of the brush will hardly be a problem and will not be a disadvantage of this method. found.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view when the filter cylinder of the present invention is cylindrical. Fig. 2 is a cross-sectional view when the filter cylinder of the present invention is conical. Cross-sectional view of 1... Outer tube 2... Filter tube (cylindrical) 3...
Brush 4...Rotating shaft 5...Drive device 6...Lower containing stock solution...Filtrate outlet 8...Filter dregs pool 9...Friction plate 10...Filter cylinder (conical) ( (above) Engraving of the drawings of the patent distributor Shio Kaken Kogyo Co., Ltd. (no changes to the contents 2. Draft procedure amendment (method) 1. Indication of the case Patent Application No. 20683 of 1985 2.
Title of the invention: Filter machine 3 with a filter media cleaning mechanism; Relationship with the case of the person making the amendment; Date of dispatch to the patent applicant: April 220, 1985; 5. Drawings to be amended; 6; Contents of the amendment.

Claims (1)

[Claims] A filter tube 2 is assembled in an outer tube 1 provided with a raw solution inlet 6 and a filtrate outlet 7, a friction plate 9 is attached between the outer tube and the filter tube, and a rotating shaft 4 is placed in the center of the filter tube. A brush 3 is attached to the outer tube 1 so that its tip comes into contact with the filter tube 2, and connected to a drive device 5 so that the brush 3 can reciprocate at an angle of less than 360 degrees. A filter having a filter medium cleaning mechanism characterized by having a pool 8 of dropped filter dregs and allowing the filter dregs to be discharged at any time.