JPH06306A - Magnetic filter - Google Patents

Abstract

PURPOSE:To lower the flow rate of a washing liquid as compared with the flow rate of a treated liquid by swiveling a washing liquid injection nozzle to successively agitate, fluidize and wash the entire part of a filter medium packed layer and disposing a flat planar permanent magnet below the packed layer in such a manner that its magnetic pole surface faces the rear surface of the filter medium packed layer. CONSTITUTION:The washing liquid is injected from the washing liquid injection nozzle 12 and the washing liquid injection nozzle 12 is swiveled to successively agitate and fluidize the entire part of the filter medium 11 packed layer. The magnetic particles captured by the filter media part are separated from the filter media 11 losing the magnetism and emerge together with the washing liquid from second liquid outlets 8. As a result, the flow rate of the washing liquid is lowered as compared with the flow rate of the treated liquid. The flat planar permanent magnet 17 is disposed below the packed layer so as to face the rear surface of the filter medium 11 packed layer and the structures to hinder the washing are not provided at all in the space where the filter media 11 are packed and therefore, the entire part of the packed layer is easily and evenly washed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic filter for removing magnetic particles suspended in a liquid such as circulating water of a wire electric discharge machine.

[0002]

2. Description of the Related Art Conventionally, as this type of device, for example,
There is one as shown in FIG. This will be described with reference to the drawings. A part of the inner pipe d is provided in a container c having a liquid inlet a and a liquid outlet b in a liquid-tight manner, and the end of the penetrating portion of the inner pipe d is closed. The container c excluding the inside of the inner pipe d
A filter medium e made of a ferromagnetic material is filled inside, and a permanent magnet f is movably accommodated in the inner tube d. The processing liquid flows into the container c from the liquid inlet a, flows through the packed layer of the filter media e, and flows out from the liquid outlet b. The filter medium e is magnetized by the permanent magnet f and attracts and captures magnetic particles in the treatment liquid. Next, when removing the magnetic particles thus captured, the liquid inlet a
The liquid outlet b and the liquid outlet b are switched to a cleaning liquid passage not shown by a valve or the like, and the permanent magnet f is connected to the filter medium e.
To move the magnetism of the filter medium e to disappear. The magnetic particles thus captured are carried to the cleaning liquid passage and removed. However, this conventional technique has the following drawbacks. That is, for example, in order to attract and capture magnetic particles having a small particle size and weak magnetism, such as magnetic particles suspended in circulating water of a wire electric discharge machine, the flow rate of the treatment liquid in the filter media packed layer is lowered. On the other hand, the flow rate of the cleaning solution for removing the magnetic particles captured by the filter medium has a minimum limit, and the flow rate needs to be about ten times the flow rate of the processing solution. Further, since the flow directions of the treatment liquid and the cleaning liquid are the same and pass through the same cross-sectional area, the flow rate of the cleaning liquid is about ten times as large as that of the embedding liquid, which is disadvantageous in that the cleaning apparatus becomes large-scale.

[0003]

The problem to be solved by the present invention is that the flow rate of the cleaning liquid is much larger than the flow rate of the processing liquid.

[0004]

In order to solve the above-mentioned problems, a magnetic filter according to the present invention is configured such that a cleaning liquid is sprayed downward from a cleaning liquid spray nozzle provided in an upper space of a filter media filling layer, and a cleaning liquid spray nozzle is provided. The filter medium is swirled, and the whole of the packed bed of filter media is sequentially stirred and fluidized for cleaning. The permanent magnet for magnetizing the filter medium is a flat permanent magnet, and is arranged below the filter media filling layer so that its magnetic pole surface faces the lower surface of the filter media filling layer.
In the space filled with the filter medium, no structure that hinders cleaning is provided. That is,
The magnetic filter according to the present invention comprises an inner tank having a liquid inlet and having an open top and a bottom made of wire mesh, an outer tank having a liquid outlet and having an open top and containing the inner tank, and a ferromagnetic material. A granular filter medium formed and filled in the inner lower space of the inner tank, and a tip inserted into the inner upper space of the inner tank from above the inner tank so that the tip is rotatable around the vertical center line of the inner tank. A cleaning liquid injection nozzle provided, a leveling bar provided at a surface position of the filter media filling layer and rotatably provided about a longitudinal center line of the inner tank as a rotation axis center, the cleaning liquid injection nozzle and the leveling device. The drive mechanism for rotating the rod, a flat plate-like permanent magnet provided below the outer tank so as to be able to move up and down, and a drive mechanism for moving up and down the flat plate-like permanent magnet are configured.

[0005]

[Operation] (3) During overtreatment, the flat plate-shaped permanent magnet is raised to the position directly below the filter media layer, and the filter media is magnetized. The treatment liquid in which the magnetic particles are suspended enters the inner upper space of the inner tank from the liquid inlet, flows in the filter media packed layer, passes through the wire net at the bottom of the inner tank, and then the wire net and the bottom plate of the outer tank. The liquid passes through the gap between the inner tank side plate and the outer tank side plate, and exits from one liquid outlet through an annular flow path formed between the inner tank side plate and the outer tank side plate. The suspended magnetic particles are attracted and captured by the filter medium magnetized by the flat plate-shaped permanent magnet while the treatment liquid flows in the filter medium packed layer. When removing the captured magnetic particles, stop the flow of the processing liquid, lower the flat permanent magnet to extinguish the magnetization of the filter media, spray the cleaning liquid from the cleaning liquid jet nozzle, and swirl the cleaning liquid jet nozzle. The whole packed bed of filter media is sequentially fluidized with stirring. The trapped magnetic particles flow away from the filter media that lost magnetism in the filter media packed layer together with the cleaning liquid, pass through the wire mesh at the bottom of the inner tank, and pass through the gap between the wire mesh and the bottom plate of the outer tank. ,
It exits from the second liquid outlet via an annular flow path formed between the inner tank side plate and the outer tank side plate. The irregularities on the surface of the filter media filling layer caused by the spray of the cleaning liquid are leveled by the turning of the leveling bar after the spraying of the cleaning liquid is stopped.

[0006]

1 shows an embodiment of the present invention, an inner tank 1
Has a liquid inlet 3 in a cylindrical inner tank side plate 2 and has an open upper surface and a wire mesh 4 at the bottom. The outer tank 5 has one liquid outlet 7 and a second liquid outlet 8 in the cylindrical outer tank side plate 6.
Is a container having an open upper surface. The inner tank 1 is accommodated concentrically in the outer tank 5 with a space between the wire net 4 at the bottom of the inner tank 1 and the bottom plate 10 of the outer tank 5 held by a spacer 9. An annular flow path is formed between the side plate 2 and the outer tank side plate 6. In FIG. 1, 11 is a granular filter medium formed of a ferromagnetic material. The cleaning liquid injection nozzle 12 is preferably composed of a vinyl hose. The swivel drive mechanism 13 is for swiveling the tip of the cleaning liquid injection nozzle 12 and the leveling rod 14 at the same time, and is composed of a geared motor 22, a gear 15, a shaft 16 and the like. The flat plate-shaped permanent magnet 17 is provided below the outer tub 5, and is moved up and down by an up-and-down drive mechanism 21 including a geared motor (not shown), a screw 18, a chain 19, a sprocket 20 and the like. . 1 in FIG.
Reference numeral 3 denotes a support for the geared motor 22 and the cleaning liquid jet nozzle 12. Reference numeral 24 denotes a case that houses the flat plate-shaped permanent magnet 17 and the elevating drive mechanism 21.

[0007]

As is apparent from the above description, in the magnetic filter of the present invention, the cleaning liquid is jetted downward from the cleaning liquid jet nozzle provided in the upper space of the filter media filling layer, and the cleaning liquid jet nozzle is swirled to filter the filter. Since the entire media-filled bed is sequentially stirred and fluidized for cleaning, the cleaning liquid flow rate can be made smaller than the processing liquid flow rate. Further, a flat permanent magnet is used as a permanent magnet for magnetizing the filter medium, and the permanent magnet is arranged below the filter medium filling layer so that its magnetic pole surface faces the lower surface of the filter medium filling layer, and the filter medium is filled with the filter medium. Since no structure that hinders cleaning is provided in the space, the entire filter media filling layer can be easily and uniformly cleaned.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a magnetic filter according to the present invention.

FIG. 2 is a schematic view of a conventional magnetic filter.

[Explanation of symbols]

1 Inner Tank 12 Cleaning Liquid Injection Nozzle 3 Liquid Inlet 13 Swing Drive Mechanism 5 Outer Tank 14 Leveling Bar 7 One Liquid Outlet 17 Flat Permanent Magnet 8 Two Liquid Outlet 21 Lifting Drive Mechanism 11 Filter Media

Claims (1)

[Claims] 1. An inner tank having a liquid inlet and having an open upper surface and a bottom made of wire mesh; an outer tank having a liquid outlet and having an open upper surface for accommodating the inner tank; A granular filter medium filled in the inner lower space of the inner tank, and a tip inserted into the inner upper empty space of the inner tank from above the inner tank so as to be rotatable about a vertical center line of the inner tank. Cleaning liquid injection nozzle, a leveling bar provided at the surface position of the filter media filling layer and rotatably provided about the longitudinal center line of the inner tank as a rotation axis center, the cleaning liquid injection nozzle and the leveling bar A drive mechanism for turning the plate, and a flat plate-like permanent magnet provided below the outer tank so as to be able to move up and down,
A magnetic filter comprising a drive mechanism for moving up and down the flat permanent magnet.