JPH04349908A - Oil purifying apparatus - Google Patents

Abstract

PURPOSE:To provide an oil purifying apparatus removing the harmful foreign matter in machine lubricating oil and machine processing oil in a low cost with high efficiency to achieve the prevention of the sudden trouble of a machine, the extension of the life of the machine and the enhancement of the quality of a product. CONSTITUTION:An oil purifying apparatus is constituted by connecting a front stage magnetic separation filter 7 to a rear stage mesh gradient type submerged filter 8. At first, a pump 6 is provided so as to allow machine lubricating or processing oil to flow in the front stage magnetic separation filter consisting of amorphous alloy fine wires and a permanent magnet of the apparatus and the oil passed through the magnetic separation filter 7 is passed through the mesh gradient type submerged filter 8. The oil passed through the mesh gradient type submerged filter 8 is returned to a machine through piping.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an oil purification device for removing harmful foreign particles such as metal powder, sand, and dust from oil such as machine lubricating oil and machining oil. It is.

0002

2. Description of the Related Art Various types of oil such as machine lubricating oil and machining oil are used in the manufacturing industry, which is currently the core of industry. Normally, these oils include internal wear of the machine, metal powder generated during machining, sand and dust that enters from the environment around the machine, and abrasive grains that enter the processing oil due to tool wear. Contains foreign particles. These foreign particles in oil cause sudden machine failures and significantly shorten machine life when used in machine lubricating oils, and cause scratches on product surfaces and reduced surface cleanliness when used in machining oils.

[0003] In order to remove these harmful foreign particles from oil, oil purification has conventionally been carried out using a mesh type filter that utilizes the sieving effect of meshes, gaps, holes, and the like. A typical mesh type filter is a surface filtration type filter called a paper pleat 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, which have many small holes to allow oil to pass through.
The inner cylinder 2 is designed to trap foreign matter in the oil on the filter paper 3 when the oil is poured.

[0004] There are filters with various filtration accuracies depending on the fiber density of the filter paper. High-precision filters effectively remove foreign particles from large diameters to small diameters, but they tend to clog quickly after installation, resulting in high maintenance and filter costs. In addition, although low-precision products require long maintenance cycles, they can be used to prevent sudden equipment failures.
It does not contribute to life extension in any way.

[0005] In addition, there is a type of oil purification device that adsorbs and removes foreign matter. The adsorption force used in this adsorption type oil purification device includes electrostatic force, chemical adsorption force, magnetic attraction, etc. Among them, an electrostatic oil purification device that uses electrostatic force as shown in Figure 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. Adsorption-type oil purifiers have an advantage over mesh-type filters in that they do not clog and have long maintenance cycles, but electrostatic oil purifiers use high voltage to remove foreign substances with high efficiency. However, if there is even a small amount of water in the oil, it may cause a short circuit and make it impossible to continue operation. In addition, in chemical adsorption oil purifiers, the adsorbent used as the element, such as diatomaceous earth, often leaks out and becomes new foreign matter, and even without it, the efficiency is low and it is not very useful.

In addition, magnetic separation type oil purifiers are composed of a filter media made of a magnetic material and a magnetizing device that applies a magnetic field to the filter media, but conventional devices use stainless steel wire as the magnetic filter media, and the magnetizing device Because it uses an electromagnet, it is very expensive, and because it only removes magnetic particles, its application is limited, and it is rarely used for cleaning machine lubricating oil. Therefore,
There is a need for an oil purification device that removes harmful foreign particles from machine lubricating oil and machining oil at low cost and with high efficiency, and which also requires long maintenance cycles.

[0007]

[Problems to be Solved by the Invention] The present invention removes harmful foreign particles from machine lubricating oil and machining oil at a low cost and with high efficiency, thereby preventing sudden breakdowns of machines, extending their service life, and improving product quality. Another object of the present invention is to provide an oil purifying device that has a long maintenance cycle and low running costs.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention has the following configuration. In other words, in an oil purification device that removes foreign particles mixed in oil such as machine lubricating oil and machining oil, the filter media is composed of a filter media made of amorphous alloy fine wire and a filter magnetization device made of a permanent magnet. The oil purification system is characterized by having a magnetic separation filter with a magnetic separation filter, followed by a mesh gradient type deep filter.

The present invention will be explained in detail below. Some of the oils used in the manufacturing industry, such as machine lubricating oil and machining oil, are contaminated with internal wear of the machine, metal powder generated during machining, sand and dust that enters from the environment around the machine, and machining oil. Contains foreign particles such as abrasive grains that get mixed in due to tool wear. These foreign particles in oil can cause sudden machine failures in machine lubricating oils and significantly shorten machine life, and in machining oils, they can cause defects on the product surface and reduce surface cleanliness, which can be harmful. As mentioned above.

[0010] In the present invention, the foreign matter particles in the oil are 70~
Focusing on the fact that it is composed of 80% relatively small-diameter ferromagnetic particles and 20 to 30% relatively large-diameter non-magnetic particles, we adsorbed and removed the ferromagnetic particles with a magnetic separation filter installed at the front stage. The configuration is such that non-magnetic particles are captured by a mesh gradient depth filter provided at the rear stage. This mesh gradient type depth filter has a particularly large foreign matter capture capacity among mesh type filters, has a long life, and is highly accurate. This combination allows the magnetic separation filter to greatly reduce the burden of foreign matter removal on the mesh filter, which is easily clogged with small-diameter particles, making it possible to use a high-precision mesh filter for a long period of time without replacing the filter.

FIG. 3 shows an example of the construction of an oil purification system according to the present invention. Machine oil flowing from an inlet first flows into a magnetic separation filter 7 by a pump 6. As shown in FIG. Here, the ferromagnetic particles in the oil are removed, then the non-magnetic particles are removed in a mesh gradient depth filter 8, and the purified oil exits through the outlet and is returned to the equipment.

FIG. 4 shows the magnetic separation filter 7. In order to make the filter inexpensive and high-performance, it is characterized by being composed of a ferromagnetic amorphous alloy thin wire 9 with high magnetic susceptibility and an inexpensive permanent magnet 10.The amorphous alloy thin wire 9 is strongly magnetized by the permanent magnet 10.
adsorbs and removes magnetic particles in oil with high efficiency. In addition, this amorphous alloy thin wire has a low coercive force and little residual magnetization when the magnetic field is removed, making it easy to wash out removed magnetic particles.At the same time, it has high strength and high corrosion resistance, so it can be reused as filter media over and over again. It is possible.

As shown in FIG. 5, the mesh gradient type depth filter 8 in the latter stage has a filter element 1 made of a mesh-like resin or natural fiber from an outer layer 11 to an inner layer 12.
Further, the outer layer 11 is composed of thick fiber diameter and large mesh, and the inner layer 12 is composed of thin fiber diameter and small highly accurate mesh. The mesh diameter gradually becomes finer from the outer layer to the inner layer, and the mesh efficiently captures and removes nonmagnetic particles from large to small. The feature of this filter is that it removes foreign matter according to particle size in the deep layer from the outer layer 11 to the inner layer 12, so it has a large foreign matter capture capacity, long life, and high accuracy.

[0014]

[Example] In a coke production process in the steel industry, hydraulic fluid in a gas switching device was purified by the oil purification device of the present invention, and compared with the oil purification ability 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.

[0015] Before installing the oil purification device according to the present invention, oil was purified using a surface filtration type filter, but the amount of foreign matter in the oil never fell below 40 mg/100 ml. However, when oil was purified using the oil purifying apparatus according to the present invention, the amount of foreign substances in the oil was successfully suppressed to 5 mg/100 ml or less. In addition, the oil purification device according to the present invention maintains its high performance for more than three years without maintenance such as filter replacement. This successfully solves the problem of balancing maintenance cycles.

[0016]

[Effects of the Invention] As described above, by using the oil purification device of the present invention, harmful foreign particles in machine lubricating oil and machining oil can be removed with high efficiency and without maintenance for a long period of time. This is an inexpensive way to prevent sudden machine breakdowns.
Longer life and improved product quality can be achieved. This is an extremely significant effect for the manufacturing industry, which must continue stable production at low costs.

[Brief explanation of drawings]

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

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

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

FIG. 4 is an explanatory diagram showing an 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 purification device 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]

1 Outer cylinder 2 Inner cylinder 3. Filter paper folded into pleats 4 Electrode 5 Dust collection 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

Claims (1)

[Claims] Claim 1: An oil purification device for removing foreign particles mixed in oil such as machine lubricating oil and machining oil, which includes a filter magnetizing device comprising a filter media made of amorphous alloy fine wire and a permanent magnet in the first stage. 1. An oil purification device comprising: a magnetic separation filter composed of a magnetic separation filter; followed by a mesh gradient type deep layer filter;