JP2877551B2 - Oil purifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil purifier for removing harmful foreign particles such as metal powder, sand and dust mixed in oil such as mechanical lubricating oil and machining oil. It is.

[0002]

2. Description of the Related Art Various types of oils, such as mechanical lubricating oils and machining oils, are currently used in the manufacturing industry, which is the core of the industry. Normally, these oils include metal powder generated from internal wear of the machine and machining, sand and dust invading from the environment around the machine, and abrasive grains mixed in the machining oil due to tool wear. Of foreign particles.
In the case of mechanical lubricating oil, these foreign particles in the oil cause a sudden failure of the machine, and at the same time, significantly shorten the machine life. In the case of the machining oil, they cause flaws on the product surface and lower the surface cleanliness.

[0003] In order to remove these harmful foreign particles from the oil, oil purification using a mesh type filter, which has conventionally used a sieve effect of meshes, gaps, holes, etc., has been performed. A typical example of the mesh type filter is a surface filtration type filter called a paper pleated type as illustrated in FIG. This has a structure in which a pleated filter paper 3 is sandwiched between an outer cylinder 1 and an inner cylinder 2 having many fine holes for allowing oil to pass through.
The inner cylinder 2 captures foreign matter in the oil on the filter paper 3 when the oil flows.

There are various types of filters having various filtration accuracy depending on the fiber density of the filter paper. A high-precision one removes foreign particles well from a large diameter to a small diameter, but causes clogging at an early stage after installation, resulting in high maintenance cost and filter cost. In addition, the low-precision one has a long maintenance cycle, but does not contribute to the prevention of sudden failure of the equipment and the extension of the service life.

[0005] In addition, there is another type of oil purifier that adsorbs and removes foreign matter. The adsorptive power used in this adsorptive type oil purifier includes electrostatic force, chemical adsorptive force, magnetic attraction, etc. Among them, the electrostatic oil purifier using electrostatic force as exemplified in FIG. 2 is famous. . In this method, an electrostatic field is applied to the electrode 4 to electrically polarize the dust collecting plate 5, and foreign particles charged by the electrostatic field are captured on the dust collecting plate 5. Such an adsorption type oil purifier is more advantageous than a mesh type filter in terms of no clogging and a long maintenance cycle, but an electrostatic oil purifier uses a high voltage to remove foreign substances with high efficiency. If a small amount of water is contained in the oil, the operation is not continued due to a short circuit. Also,
In a chemical adsorption type oil purification device, an adsorbent such as diatomaceous earth used as an element often leaks out and becomes a new foreign substance, and without it, the efficiency is low and it is not very useful.

The magnetic separation type oil purifier is composed of a filter medium made of a magnetic material and a magnetizing device for applying a magnetic field to the medium. A conventional device uses a stainless steel wire for the magnetic filter medium and uses a magnetizing device. Because of the use of electromagnets, it is very expensive, and since it only removes magnetic particles, its application is limited, and it is hardly used for purifying mechanical lubricating oil. Therefore,
There is a need for an oil purifier that removes harmful foreign particles in mechanical lubricating oil and machining oil at low cost and with high efficiency, and that has a long maintenance cycle.

[0007]

SUMMARY OF THE INVENTION The present invention removes harmful foreign particles in mechanical lubricating oils and machining oils at low cost and with high efficiency, thereby preventing unexpected failure of the machine, extending the service life, and improving the product quality. It is another object of the present invention to provide an oil purifier having a long maintenance cycle and low running cost.

[0008]

The present invention has the following features to attain the above object. That is, in an oil purifier that removes foreign particles mixed in oil such as mechanical lubricating oil and machining oil, the oil purifier is composed of a filter medium made of an amorphous alloy fine wire and a filter magnetizing device made of a permanent magnet in the preceding stage. A magnetic separation filter, and a mesh gradient type deep layer filter is provided at the subsequent stage.

Hereinafter, the present invention will be described in detail. Among the oils used in the manufacturing industry, such as mechanical lubricating oils and machining oils, include metal powder generated from internal wear of the machine and machining, sand and dust entering from the environment around the machine, and machining oil. In this case, foreign particles such as abrasive grains mixed by tool wear are included. These foreign particles in oil can cause sudden failures of machinery in machine lubricating oils and significantly shorten the machine life. As described above.

[0010] In the present invention, the foreign matter particles in the oil are 70 to
Focusing on the fact that it is composed of 80% of relatively small diameter ferromagnetic particles and 20 to 30% of relatively large diameter nonmagnetic particles, the magnetic separation filter provided at the preceding stage adsorbs and removes the ferromagnetic particles. The non-magnetic particles are captured by a mesh gradient type deep filter provided at the subsequent stage. This mesh type deep filter has a particularly large foreign matter capturing capacity and a long life and high accuracy among mesh filters. With this combination, the load of removing foreign substances of the mesh filter which is easily clogged by small-diameter particles is greatly reduced by the magnetic separation filter, so that a high-precision mesh filter can be used for a long time without replacing the filter.

FIG. 3 shows an example of the configuration of the oil purifier of the present invention. The mechanical oil flowing from the inlet first flows into the magnetic separation filter 7 by the pump 6. Here, the ferromagnetic particles in the oil are removed, and then the non-magnetic particles are removed in the mesh gradient type deep filter 8, and the purified oil is returned from the outlet to the equipment.

FIG. 4 shows the magnetic separation filter 7. In order to make the filter inexpensive and high-performance, the filter comprises a ferromagnetic amorphous alloy thin wire 9 having a high magnetic susceptibility and an inexpensive permanent magnet 10.
Absorbs and removes magnetic particles in oil with high efficiency. In addition, this amorphous alloy thin wire has low coercive force and has little residual magnetization when the magnetic field is removed, so it is easy to wash out the removed magnetic particles, and at the same time it has high strength and high corrosion resistance, so it can be reused as a filter medium many times It is possible.

The latter stage of the mesh gradient type deep filter 8
As shown in FIG. 5, the outer layer 11 to the inner layer 12 are constituted by a filter element 13 made of mesh-like resin or natural fiber, the outer layer 11 has a large fiber diameter and a large mesh, and the inner layer 12 has a thin fiber. It is composed of small diameter and high precision mesh. The mesh diameter gradually becomes smaller from the outer layer toward the inner layer, and the mesh efficiently captures and removes non-magnetic particles from large to small. The feature of this filter is that the foreign matter is removed according to the particle size in the deep layer from the outer layer 11 to the inner layer 12, so that the foreign matter capturing capacity is large and the life is long and the precision is high.

[0014]

EXAMPLE In the coke manufacturing process of the steelmaking industry, the hydraulic oil of the gas switching device was purified by the oil purification device of the present invention and compared with the oil purification capability of a conventional surface filtration type filter. FIG. 6 shows the change over time in the amount of foreign particles contained in 100 cc of hydraulic oil.

Before installing the oil purifier according to the present invention, the oil was purified by a surface filtration type filter, but the amount of foreign substances in the oil did not fall below 40 mg / 100 ml. However, when oil purification was performed using the oil purification device according to the present invention, the amount of foreign substances in oil was successfully suppressed to 5 mg / 100 ml or less. In addition, the oil purifier according to the present invention has maintained the same high performance for three years or more without maintenance such as filter replacement. Conventionally, it has been a trade-off problem in the concept of oil purification. The problem of balancing maintenance cycles has been successfully solved.

[0016]

As described above, by using the oil purifier of the present invention, harmful foreign particles in mechanical lubricating oil and machining oil can be removed efficiently and without maintenance for a long period of time. Inexpensive machine failure prevention,
Longer life and improved product quality can be realized. This is a huge benefit for the manufacturing industry, which must maintain stable production at low cost.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a conventional surface filtration type filter.

FIG. 2 is an explanatory view showing an example of a conventional electrostatic oil purifier.

FIG. 3 is an explanatory diagram showing a device configuration of the present invention.

FIG. 4 is an explanatory view showing one example of a magnetic separation filter constituting the oil purification device of the present invention.

FIG. 5 is an explanatory diagram showing an example of a mesh filter constituting the oil purifier of the present invention.

FIG. 6 is an explanatory diagram showing a comparison between the oil purification effect of the oil purification device of the present invention and the effect of a conventional oil purification method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer cylinder 2 Inner cylinder 3 Folded filter paper 4 Electrode 5 Dust collecting plate 6 Pump 7 Magnetic separation filter 8 Mesh type filter 9 Amorphous alloy thin wire 10 Permanent magnet 11 Outer layer 12 Inner layer 13 Filter element

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-130572 (JP, A) JP-A-57-59613 (JP, A) Real opening Sho-59-158421 (JP, U) (58) Field (Int.Cl. ⁶ , DB name) B01D 35/06 B01D 35/02 B01D 36/00

Claims (1)

(57) [Claims] 1. An oil purifier for removing foreign particles mixed in oil such as mechanical lubricating oil and machining oil, comprising: a filter magnetizing device comprising a filter medium comprising an amorphous alloy fine wire and a permanent magnet; An oil purification device comprising: a magnetic separation filter comprising: a mesh gradient type deep filter provided at a subsequent stage.