JPH0529045Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic filter that removes metal powder from hydraulic oil used in hydraulic equipment and the like by adsorption.

[Conventional technology]

Conventionally, as shown in FIG. 4, this type of magnetic filter has a cylindrical filter element 1 housed in a case 2, which is made of a cylindrical filter sheet that is folded into a corrugated shape. , whose upper and lower sides are closed with covers 3.

The filter element 1 is inserted into a shaft 5 that hangs down from a T-shaped joint 4, and is fixed concentrically with the shaft 5 via a cover 3 at the top and bottom with bolts 6. A magnet 7 is inserted and fixed. In the figure, 8 is an oil inlet of the T-shaped joint 4, 9 is an oil outlet, 10 is a cover that is detachable from the case 2, and 11 is a detector for detecting clogging of the filter element 1.

Therefore, when the hydraulic oil flowing in from the oil inlet 8 passes from the outside to the inside of the filter element 1, contaminants are filtered by the filter element 1, and especially the inside of the filter element 1 is filtered. The magnetic iron powder in the hydraulic oil that has flowed into the shaft 5 is adsorbed and captured by a magnet 7 fixed to the shaft 5, and the cleaned hydraulic oil flows out from an oil outlet 9 and is supplied to predetermined hydraulic equipment.

However, in the conventional magnetic filter as described above, since there is a considerable distance between the inner circumferential surface of the filter element 1 and the outer circumferential surface of the magnet 7, the hydraulic oil flowing close to the outer circumferential surface of the magnet 7 is The magnetic iron powder inside is reliably attracted, but as the distance from the magnet 7 increases, the adsorption force becomes weaker, so most of the magnetic iron powder will flow out from the oil outlet 9 as it is, and the magnetic iron The disadvantage is that the powder removal effect is low.

By eliminating these conventional drawbacks,
For example, Japanese Utility Model Publication No. 33-16891 proposes a magnetic filter in which magnetized mesh rings and non-magnetic spacers are fixed alternately and concentrically.

[Problem that the invention attempts to solve]

However, conventional magnetic filters of this type, such as the above-mentioned Utility Model Publication No. 33-16891, are structurally difficult to manufacture, and the spacers are meshes, coarse sheets, or have a predetermined thickness. ,
No gaps are formed between the stacked magnetic filters. Therefore, the flow rate of the hydraulic oil passing through the magnetic filter becomes faster, and while it is difficult for the magnetic filter to reliably adsorb magnetic iron particles in the hydraulic oil, it is also likely that the magnetic filter will quickly become clogged. Various problems arose.

[Means for solving problems]

The present invention was developed in order to solve the above-mentioned conventional problems, and is easy to manufacture, and is configured so that the flow velocity of the hydraulic oil passing between the porous magnetic sheets is as slow as possible. The purpose of this is to provide a product that can reliably adsorb magnetic iron particles in the hydraulic fluid and has less clogging. This magnetic filter is characterized in that a predetermined number of porous nonmagnetic materials made of corrugated sheets are alternately laminated and wound spirally to form a cylindrical filter element.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in FIGS. 1 to 3. Note that FIG. 1 is a partially cutaway front view of the magnetic filter according to the present invention, and FIG. 2 is a perspective view of the structure of the filter element.
FIG. 3 is a perspective view of the constituent members of the filter element.

In the figure, reference numeral 1 denotes a cylindrical filter element housed in a case 2, which includes a porous magnetic sheet 3 made of a magnetic rubber sheet, etc., and a space between the two magnetic sheets 3 when stacked. A predetermined number of porous non-magnetic materials 4 made of corrugated sheets are alternately laminated and wound spirally to form a cylindrical shape. , 6 are fixed.

Here, when the flow rate of the hydraulic oil passing through the filter element 1 is constant, the larger the space between the magnetic sheets 3, the lower the flow velocity. This is what I did. As a result, a large gap is formed between the magnetic sheets 3 and 3 due to the concave portion of the non-magnetic material 4, and the flow rate of the hydraulic oil passing through the holes in the magnetic sheet 3 becomes slow, so that the magnetic powder in the hydraulic oil passes through the filter. It becomes easier to adsorb to element 1. At the same time, since the stacked magnetic sheets 3, 3 are separated by a relatively large concave gap, clogging is less likely to occur. However, there are restrictions on the number of filter elements 1, so
In an embodiment of the present invention, a corrugated plate with a height of peaks and valleys of the non-magnetic material 4 of about 1 to 2 mm is used, and the thickness of the filter element 1 itself is about 10 mm. Note that this non-magnetic material for space has a third
As shown in the figure, a stainless steel corrugated plate 4 in which a large number of punch holes 4a are formed is used.

Reference numeral 7 designates a T-shaped joint, and a shaft 8 hanging from the T-shaped joint 7 extends vertically through the inside of the filter element 1. By screwing a bolt 9 into a male thread at the tip protruding from the lower surface of the lower cover 6, A filter element 1 is fixed concentrically to a shaft 8 via upper and lower covers 5 and 6. In addition, in the figure, 10 is an oil inlet of the T-shaped joint 7, 11 is an oil outlet, 12 is a cover that can be attached to and detached from the case 2, and 1
3 indicates a detector for detecting clogging of the filter element 1.

Therefore, contaminants such as metal powder, sand, and rust in the hydraulic oil that flows in from the oil inlet 10 are first filtered when passing from the outside to the inside of the filter element 1 . In particular, since the iron powder in the hydraulic fluid always passes near the magnetic sheet 3 in a slow flow, the iron powder is first reliably adsorbed on the surface of the magnetic sheet 3, and then When passing through the hole, it is absorbed and captured at the periphery of the hole. When a large amount of iron powder is attracted and captured at the periphery of the hole in the magnetic sheet 3, it falls into the recessed portion of the non-magnetic material 4, so that clogging is less likely to occur.

Then, the filtered hydraulic oil flows out from the oil outlet 11 and is supplied to predetermined hydraulic equipment and the like.

[Effect of idea]

As described above, the magnetic filter according to the present invention consists of alternately laminating a predetermined number of porous magnetic sheets and porous nonmagnetic material made of corrugated sheets, and winding them in a spiral to form a cylindrical filter element. Because of this structure, even when the porous nonmagnetic material is wound in a spiral shape, it can be wound along the irregularities.

Therefore, the material is easy to obtain, the filter is easy to manufacture, and the hydraulic oil flows through the holes of the porous magnet sheet at a slow flow rate, so that the magnetic material such as iron powder is reliably adsorbed and captured, and the removal effect of magnetic powder is improved significantly. Also, there is little clogging, so the replacement work can be done less frequently.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of a magnetic filter according to the present invention, Fig. 2 is a perspective view of the structure of a filter element used in the filter, and Fig. 3 is another embodiment of the constituent members of the filter element. FIG. 4 is a perspective view showing an example, and a partially cut-away front view of a conventional magnetic filter. 1...Filter element, 2...Case, 3
...Porous magnetic sheet, 4...Porous nonmagnetic corrugated plate, 4a...Punched hole, 8...Shaft.

Claims (1)

[Scope of utility model registration request] A magnetic filter characterized in that a predetermined number of porous magnetic sheets and a porous nonmagnetic material made of corrugated plates are alternately laminated and wound in a spiral to form a cylindrical filter element.