JPH03242206A - Filter - Google Patents

Abstract

PURPOSE:To efficiently filter off oil in the filter for an oil-water suspension, etc., by interposing at least one bed of an auxiliary filter medium consisting of activated carbon between the plural beds of a main filter medium consisting of a chipped filter body. CONSTITUTION:A perforated plate 11 is set at the bottom of a cylindrical filter main body 1, plural beds of the main filter medium 12 obtained by forming a chipped felt body into a flat structure are provided, the auxiliary filter medium 13 consisting of activated carbon is interposed between the beds, and a perforated plate 10 is placed thereon. An oil-water suspension is introduced into the bottom of the main body 1 from an inlet pipe 9, diffused by the perforated plate 11 and passed successively through the main filter medium 12 and auxiliary filter meadim 13. The oil is adsorbed and separated by the felt body and activated carbon, and the water without oil is discharged from a discharge pipe 8 through the perforated plate 10. Filtration efficiency is improved in this way.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a filtration device such as a drain, and more particularly to a filtration device for efficiently filtering oil from an oil-water suspension to obtain a clean solution. .

(Prior Art and its Problems) In industrial equipment such as compressors and pumps, an oil-water suspension, so-called drain, in which oil such as lubricating oil and water generated from the equipment are suspended, is discharged as waste liquid. In addition to these waste liquids, it is often necessary to separate oil from the oil-water suspension or to filter solids. Due to environmental conservation requirements, the disposal of the suspension and wastewater into rivers, etc. is strictly regulated by ordinances, etc., and it is obligatory to dispose of the liquid after sufficient oil content has been removed to make it clear water.

Conventionally, a filtration device in which a felt-like filter material is housed in a cylindrical body has been used as a filtration device for these drains. In this filtration device, the felt-like filter material is cut into thin circular shapes that match the cross-sectional shape of the cylindrical body, and a large number of the circular bodies are stacked vertically and compressed vertically under high pressure. Further, the drain is introduced from an inlet provided at the lower part, passes through the filter material, and taken out from the outlet provided at the upper part.

However, in a filtration device with this structure, although the circular filtration media are compressed together, sufficient pressure is not applied between the filtration media and the inner wall of the device, and the liquid to be filtered is introduced from the inlet at the bottom of the device. However, the liquid to be filtered mainly flows between the periphery of the filtration material and the inner wall of the device, comes into contact only with the periphery of the filter material, and is often removed from the filtration device without being sufficiently filtered. In order to eliminate this drawback, the filtration device should be structured to have a sufficient length in the vertical direction to obtain sufficient contact time, or the liquid to be filtered should be passed through a plurality of filtration devices for a sufficient length of time. Attempts have been made to obtain filtration efficiency. However, such a structure results in an increase in the size of the device, a decrease in processing capacity per unit device, and an increase in the installation area. Therefore, a filtration device with a simpler structure that can efficiently process the liquid to be filtered such as drain is desired. There is.

(Object of the Invention) The present invention aims to solve the above-mentioned drawbacks of the prior art and provide a filtration device that can efficiently filter a liquid to be filtered by simply making improvements to the conventional filtration device. purpose.

(Structure of the Invention) The present invention provides a filtration device in which a liquid to be filtered is supplied from a lower part, the liquid to be filtered is filtered by a filtering material housed inside the filtering material, and taken out from the upper part. A filtration device comprising at least one layer of auxiliary filtration material existing between the main filtration material and the main filtration material.

The present invention will be explained in detail below.

The present invention is characterized by forming a granular auxiliary filter material layer through which a liquid to be filtered can flow relatively easily between the main filter material layers housed in a compressed state. It can be used for As the main filtration material, a plurality of laminated planar filtration materials formed in the cross-sectional shape of the conventional circular filtration device described above may be used, or a felt-like filtration material may be used in the form of chips. Although it is possible to use any material that has been shredded into pieces and stored in a randomly compressed state, in the present invention, it is preferable to use the latter main filter material that has been shredded into 1,000-knob shapes. Further, preferably granular or powdered substances such as activated carbon or sand can be used as auxiliary filter media.

The function of the auxiliary filter medium is to form a buffer area for the liquid to be filtered flowing through the main filter medium layer. In other words, when a circular filter medium is used as the main filter medium, the flow of the liquid to be filtered is likely to be limited between the peripheral edge of the main filter medium and the inner wall of the device, but even between the peripheral edge and the inner wall of the device, it may be compressed. Accordingly, there will be areas where it is easy to circulate and areas where it is difficult to circulate, and if the auxiliary filter material is not present, the liquid to be filtered that is flowing through the areas where it is easy to circulate will rise at once between the peripheral edge and the inner wall, resulting in insufficient filtration. However, due to the presence of the granular auxiliary filtration material with a relatively large void ratio, the liquid to be filtered that flows between the peripheral edge and the inner wall and reaches the auxiliary filtration material becomes an auxiliary source with low resistance. Because the liquid is diffused throughout the filter material, the liquid to be filtered that has passed through areas where it is easy to circulate and areas where it is difficult to flow is once collected in the auxiliary filter medium and then flows again between the periphery and the inner wall, resulting in the entire wave source filtrate. The degree of filtration becomes uniform.

As the main filtration material, a chip-shaped filtration material can be used in addition to a planar filtration material, and in this chip-shaped main filtration material, the liquid to be filtered can flow between the shredded chip-shaped main filtration materials. Therefore, the contact efficiency between the liquid to be filtered and the main filter medium is greatly increased compared to a planar main filter medium, and the liquid to be filtered can be processed extremely efficiently. Even in the case of this chip-shaped main filter material, depending on the compression state, there are areas where it is easy to flow and areas where it is difficult to flow, and the rising speed often differs.

Therefore, even in the case of this chip-shaped main filter material, by forming the auxiliary filter material layer, it is possible to suppress non-uniformity of filtration efficiency due to local differences in rising speed.

The material of the auxiliary filtration material is not particularly limited, and any material having a resistance lower than the resistance flowing between the main filtration material and the inner wall of the device and between the main filtration material and the dirt floor, for example, activated carbon, sand, etc., may be used in any filling state. However, as mentioned above, it is preferable to make the space ratio relatively large in the form of powder or granules. This auxiliary filtration material may or may not have a filtration function (and may also have other functions in addition to the normal filtration function. For example, if activated carbon is used as the auxiliary filtration material, oil removal Removal and decolorization can be performed by adsorption, making it possible to perform more effective treatment of the filtered liquid.

When a chip-shaped filter material is used as the main filter material, a flow path is formed between the filter materials as described above, and the filtration efficiency is greatly increased. Therefore, if the non-uniformity of the rising speed is not a big problem, or if the main filtration material can be accommodated in the device to prevent non-uniformity, the filtrate can be filtered with sufficient efficiency without using the auxiliary filtration material. Filtration can be performed.

(Example) Next, an example of a filtration device according to the present invention will be described based on the accompanying drawings, but the present invention is not limited to this example.

The drawing is a longitudinal cross-sectional view showing an embodiment of a filtration device according to the present invention.

A cylindrical filter body 1 made of metal such as stainless steel, metal alloy, or synthetic resin such as vinyl chloride has a pair of flanges 2.3 facing outward at the upper and lower ends. A lid 4 having a matching peripheral edge is fastened to the upper flange 2, and a bottom plate 5 having a matching peripheral edge is fastened to the lower flange 3. A filtrate outlet 6 and a filtrate introduction lower are bored in the center of both the lid 4 and the bottom plate 5, and the filtrate outlet 6 has an elbow-shaped opening extending laterally at the other end. A filtrate extraction pipe 8 is fitted into the filtrate introduction lower, and an elbow-shaped filtrate introduction pipe 9 whose other end extends laterally is fitted into the filtrate introduction lower.

Slightly below the lid 4 and slightly above the bottom plate 5,
A pair of perforated plates 10, each made of punched metal.
11 is installed, and a filter material is accommodated in a compressed state between both perforated plates 10 and 11. In the illustrated embodiment, the filter material has a planar structure that conforms to the cross-sectional structure of the main body 1, for example, a plurality of thin circular filter materials stacked one above the other, or a thousand knob-shaped pieces cut into irregular shapes. It consists of a total of four layers of main filter media 12 formed by compression, and three layers of auxiliary filter media 13 made of, for example, activated carbon, laminated between the 12 layers of the main filter media.

Although the interface between the two filter media 12 and 13 does not necessarily need to be formed in a straight line as shown in the figure, it is preferable that the interface be formed in a straight line so that the liquids to be filtered having different rising speeds can be spread as uniformly as possible.

When a liquid to be filtered is introduced into the filtration device having such a configuration from the liquid to be filtered introduction pipe 9 as shown by the arrow in the figure, the liquid to be filtered passes through the through holes in the lower perforated plate 11 and first reaches the bottom layer. contact with the main filter medium 12 of. The liquid to be filtered flowing through the main filtering material 12, for example, a chip-shaped permeable material, has a local increase or decrease in its rising speed, and the liquid to be filtered quickly reaches the auxiliary filtering material 13 which is in contact with the upper surface of the main filtering material 12. The liquid to be filtered is divided into the liquid to be filtered that reaches the auxiliary filter medium 13 quickly, but the liquid to be filtered that reaches the auxiliary filter medium 13 quickly diffuses into the auxiliary filter medium 13 with low flow resistance, and all the liquid to be filtered reaches the auxiliary filter medium 13. After that, the liquid to be filtered flows through the next main filter medium 12 and is filtered.In this way, the liquid to be filtered passes through the main filter medium 2 and the auxiliary filter medium 13 in order to remove unnecessary components, usually oil content, from the liquid to be filtered. is removed and the purified liquid to be filtered passes through the holes in the upper perforated plate 10 from the uppermost main filter medium 12 and is further taken out of the apparatus from the liquid to be filtered outlet 8.The removed liquid to be filtered If the degree of cleaning is sufficient, it can be disposed of directly into a river, etc. If it is not, it can be filtered again and then disposed of.

In the filtration device of this embodiment, the entire device or the lid may be made of a transparent material in order to visually confirm the filtration status within the device, that is, the color of the liquid to be filtered and the surface condition of the filter material.

Further, instead of the illustrated lid that is fastened to the flange of the main body, a cap-like lid that is threaded into the upper peripheral edge of the main body and screwed thereto may be used.

Furthermore, it is also possible to use a granular main filter material instead of a chip-like main filter material.

(Effects of the Invention) The present invention provides a filtration device in which the filtration material of the filtration device is composed of a plurality of layers of main filtration material and at least one layer of auxiliary filtration material existing between the main filtration material. Yes (Claim 1).

With this configuration, by dispersing the liquid to be filtered, which has local differences in rising speed within the main filter layer, into the auxiliary source filtration material, which is a buffer region, it is possible to prevent the liquid from rising and falling locally due to differences in rising speed. After correcting the misalignment of the positional relationship, the liquid to be filtered is supplied to the following main filter material layer to prevent uneven filtration due to differences in the contact time between the liquid to be filtered and the main filter material due to differences in rising speed. can do.

It is desirable to use a felt body shredded into chips as the main filtration material (Claim 2), and a large number of flow paths for the liquid to be filtered are formed between the shredded main filtration materials so that the liquid to be filtered is is in sufficient contact with the main filter medium to achieve cleaning.

Although the auxiliary filter medium in the present invention does not have to have a filtering function, it is preferable to use a substance that has a different filtering function from that of the main filtering medium, such as adsorption or decolorization function using activated carbon (Claim 3). Furthermore, the filtration efficiency of the filtration device according to the present invention is further improved.

[Brief explanation of drawings]

The drawing is a longitudinal cross-sectional view showing an embodiment of a filtration device according to the present invention. 4... Lid body 5... Bottom plate 6... Outlet port 7... Inlet port 8... Outlet pipe 9... Inlet pipe 10.11... Porous vi12... Main filter material 13・・・
・Auxiliary filter material

Claims (3)

[Claims] (1) In a filtration device in which a liquid to be filtered is supplied from the lower part, the liquid to be filtered is filtered by a filtering material housed inside and taken out from the upper part, the filtering material is connected to a plurality of layers of main filtering material. A filtration device comprising at least one layer of auxiliary filtration material existing between main filtration materials. (2) The filtration device according to claim 1, wherein the main filtration material is a felt body shredded into chips. (3) The filtration device according to claim 1 or 2, wherein the auxiliary filter material is activated carbon.