JPH11151407A - Filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a filtration time by forming the filter for removing magnetic particles such as iron powder in a medium by filtration by magnetizing a fibrous 1 consisting of a hard magnetic powder and a high molecular compd. so that fine particles in the medium are adsorbed and captured to the fibrous. SOLUTION: The filter such as soil filter mounted to an automobile is formed from a material in which the fibrous matter 1 consisting of the hard magnetic powder and the high molecular compd. are magnetized. A contact area of the hard magnetic body and fine particles 2 is enlarged and an adsorption area is also enlarged, and a capturing capacity of the fine particles 2 is improved even same hard magnetic body by converting the hard magnetic body to the fibrous matter 1 by using the high molecular compd.. At the time of using the filter, when the fine particles 2 such as iron powder in the medium are passed between the fibrous matter 1, the capacity for capturing/removing the fine particles 3 of the filter is improved by adsorbing the fine particles 3 having a smaller particle size than a space of the fibrous matter 1 by magnetic draw-in force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for filtering and removing magnetic particles such as iron powder in a medium.

[0002]

2. Description of the Related Art A conventional filter is used for filtering through a gas or liquid as a medium and collecting and removing fine particles such as iron powder and dust contained in the medium.
The collection of microparticles in the filter is due to the sieving action of blocking particles larger than the spacing between filter fibers.

[0003] For this reason, if the particle size of the fine particles in the fine particles 2 in the medium is small, there are residual particles 12 that pass through between the fibrous materials 11 of the filter (FIG. 2). Therefore, it is necessary to use a filter (a fine-grained filter) having a fiber interval smaller than the particle size of the fine particles to be removed.

[0004]

However, if the distance between the fibers of the filter is reduced in order to collect and remove the fine particles, the transmission of the medium itself through the filter is also inhibited. That is, when the size of the filter is reduced, the diameter of the fine particles that can be collected becomes smaller and the amount of the fine particles removed increases, but the permeation time of the medium (fluid) becomes longer. The time required for this fluid to pass through the filter is proportional to the fluid resistance experienced by the fluid, and the fluid resistance increases as the size of the filter becomes finer. In order to shorten the time required for the fluid to pass through the filter, the flow speed and pressure of the fluid can be increased by increasing the pressure.However, the pressure from the fluid applied to the filter increases and the filter may be destroyed. . Therefore, it is better that the roughness of the filter is as coarse as possible in accordance with the particles to be removed.

Similarly, in a device for circulating a medium, such as an oil filter mounted on an automobile, the size (particle size) of the fine particles that can be collected and the processing capability of permeating and filtering the medium (fluid resistance). The coarseness of the filter is determined in consideration of the inverse number. Therefore, the fine particles having a small particle diameter are circulated with the engine oil forever, and the only way to remove them is to discard the entire engine oil.

[0006] The presence of fine particles in the medium changes the properties of the medium, so that when the medium is engine oil or the like, there is also a risk of damaging the engine body. Therefore, it is desirable to remove minute particles from the engine oil as a medium as much as possible. However, if the filter is made finer to remove finer particles, the fluid resistance of the filter increases, and the permeation of the engine oil increases. And the flow rate of the permeating and circulating engine oil decreases.

An object of the present invention is to provide a filter which has a low fluid resistance and can collect and remove fine particles.

[0008]

The present invention is characterized in that a fibrous material comprising a hard magnetic powder and a polymer compound is magnetized, and fine particles in a medium are adsorbed and collected on the fibrous material. Is a filter.

That is, the present invention is obtained by magnetizing a filter mixed with unmagnetized hard magnetic powder,
It utilizes the magnetic attraction of a filter fibrous material containing hard magnetic powder. As shown in FIG. 1, when fine particles 2 such as iron powder in a medium pass between filter fibrous materials 1, fine particles having a particle size smaller than the interval between filter fibrous materials due to magnetic attraction force. 3 is also adsorbed by the filter fibrous material, so that the ability of the filter to collect and remove fine particles is improved.

In order to remove iron powder and the like in the medium, a method of using a lump such as a permanent magnet may be considered. However, the lump has a small surface area and a small contact area with fine particles. No improvement in trapping and removing capacity can be expected. In the present invention, the hard magnetic material is formed into a fibrous material by using a polymer compound, so that the contact area between the hard magnetic material and the fine particles is increased,
The adsorption area is also increased to improve the ability to capture fine particles even with the same hard magnetic material.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The filter of the present invention is obtained by using a fibrous material obtained by kneading a hard magnetic powder as a raw material of a permanent magnet and a polymer compound such as a nylon resin, and magnetizing the filter. This is a filter for adsorbing and collecting fine particles in the medium to the fibrous material.

[0012]

Embodiments of the present invention will be described below.

(Example 1) 8 wt%, 15 wt%, and 20 wt% (the above examples) of hard magnetic Sr-ferrite powder were mixed with a nylon resin as a polymer compound, and kneaded. , And spun into a fibrous material having a diameter of 10 μm or less. As a comparative example, the same nylon resin was spun to obtain a fibrous material having a diameter of 10 μm or less.

Using the produced fibrous material as a material, it was processed into a filter having a thickness of about 1 mm to obtain a filter of the present invention and a filter of a comparative example. The obtained filter was exposed to a magnetic field of 10 kOe and magnetized.

Using the obtained three types of filters of the present invention and the filter of the comparative example, the used engine oil was filtered in the same amount. The time from the start to the end of the filtration and the content of iron powder (fine particles) in the engine oil before and after the filtration were measured. Table 1 shows the filter times of the filter of the present invention (Example samples 1 to 3) and the filter of the comparative example, and 1 before filtration.
It shows the amount of residual iron powder (fine particles) after filtration when it is set to 00%.

[0016]

As shown in Table 1, when the filter using the fiber containing the hard magnetic powder is magnetized, the effect of collecting and removing the iron powder is remarkably improved even if the filtration time is the same.

Example 2 A rare earth cobalt compound (Sm-
20% by weight of Co) powder (above, Examples),
After kneading, it was spun to obtain a fibrous material having a diameter of 10 μm or less. As a comparative example, a nylon-based resin was spun into a fibrous material having a diameter of 10 μm or less. Using the produced fibrous material as a material, it was processed into a filter having a thickness of about 1 mm to obtain a filter of the present invention (sample No. A1) and a filter of a comparative example (sample No. B1). Then, the filter of this example was exposed to a magnetic field of 20 kOe to be magnetized.

Using the same fibrous material as that used for the filters of Sample Nos. And B1, two kinds of filters (samples having finer spaces than the filter of the embodiment) (the spacing between the fibrous materials is smaller) Nos. B2 and B3) were obtained and used as comparative examples of the medium filtration time. Regarding the coarseness of the filter, B2 is finer than B1 and B3 is finer than B2.

The same amount of used engine oil was filtered using the four types of filters obtained as described above. The time from the start to the end of the filtration and the content of iron powder (fine particles) in the engine oil before and after the filtration were measured. Table 2 shows the measured filtration time and the amount of residual iron powder (fine particles) after filtration when the value before filtration is defined as 100%.

[0021]

As shown in Table 2, Sample No. A in which a filter using a fibrous material mixed with hard magnetic powder was magnetized was used.
The amount of residual iron powder of the medium filtered through the first filter is smaller than that of the fine filters B2 and B3. In addition, the time for filtering the same amount of medium is B3 when the filter of A1 is used.
Is 以下 or less of the case where the filter is used.

As described above, according to this embodiment, finer particles can be collected and removed, and the filtration time can be shortened. That is, a filter having a small fluid resistance can be provided. It was confirmed that.

[0024]

According to the present invention, it is possible to obtain a filter having a small fluid resistance and capable of collecting and removing fine particles.

[Brief description of the drawings]

FIG. 1 is a schematic view showing the operation of a filter according to the present invention.

FIG. 2 is a schematic diagram showing a sieving operation of a conventional filter.

[Explanation of symbols]

 Reference Signs List 1 fibrous material (of filter of the present invention) 2 microparticles 3 microparticles (adsorbed on fibrous material) 11 fibrous material (of conventional filter) 12 residual particles

Claims (1)

[Claims] 1. A filter characterized in that a fibrous material comprising a hard magnetic powder and a polymer compound is magnetized, and fine particles in a medium are adsorbed and collected on the fibrous material.