JPS62125808A - Filter device - Google Patents

Abstract

PURPOSE:To enable backwash washing to be easily and completely performed and to enable filtering operation for a long period by using a filter medium which is formed by boring proper numbers of through-holes having a proper diameter on a freely extensible and contractible base body. CONSTITUTION:Liquid contg. e.g. a solid dirty substance is filtered by a filter medium 1 consisting of silicone rubber and urethan rubber or the like which is formed by boring proper numbers of through-holes 3 having a proper diameter on a freely extensible and contractible base body 2 and also the through-holes 3 are extended in a time of backwash and contracted in case of refiltering it after finish of backwash. As a result, backwash washing can be easily and completely performed. When stopping feed of washing water after finish of backwash washing, it is easily restored and filtering operation is enabled for a long period by repeat this operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a filtration device suitable for use in removing solid pollutants such as IP turbidity in liquids and gases.

[Conventional technology]

In general, various types of solid pollutants are suspended or floating in wastewater, and if these are left as is, they will have a negative impact on the treatment of the wastewater, so it is necessary to filter them before treatment. Efforts are being made to remove sexual pollutants.

However, conventional filtration devices employ filter media made of, for example, metal (especially sintered metal), ceramic, plastic, cloth, etc., and each time filtration is performed for a certain period of time, the washing water is flowed in the opposite direction to that during filtration. Since it was used after washing, it was difficult to use it for the above purpose.

[Problem that the invention seeks to solve]

That is, in conventional filtration devices, the filter medium is hard and thick made of the material described above, so no matter how much slag filtration or backwashing is performed, clogging cannot be avoided. If this is not possible and clogging occurs,
Not only does the efficiency of filtration decrease, but the diameter of the filter holes does not change, making backwashing impossible. Therefore, it is necessary to replace the filter medium at relatively short intervals, which is extremely troublesome, especially when the filter medium is sintered. This was especially true for items with complex internal structures, such as metals.

Additionally, since the filter medium itself is generally heavy, the filtration device itself has a large capacity, and the structure of the filter medium has no flexibility, which imposes many restrictions on the overall format and method of the filtration device. The landing points were also pointed out.

[Means for solving problems]

The present invention has been made for the purpose of solving the above-mentioned difficulties of the prior art, and its structure uses a filter medium formed by punching an appropriate number of through holes of an appropriate diameter in a retractable base, and at least The through hole is characterized in that it expands during backwashing and contracts after backwashing is completed.

〔Example〕

Next, an example of implementation of the present invention will be explained with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a filter medium used in the present invention, which is formed by punching an appropriate number of through holes 3 of an appropriate diameter in a freely expandable base 2. This filtration device filters a liquid containing solid pollutants, and enlarges the through hole 3 during backwashing, and reduces the through hole 3 when filtering again after the end of backwashing.

There are various materials for forming the filter medium 1, including silicone rubber and urethane rubber.

Examples include butadiene rubber, polyvinyl alcohol, natural rubber, dibutyl rubber, polypropylene rubber, etc. alone or in combination, or mixtures of these and other plastics, and the elongation rate is 5%.
It is desirable that the elasticity is between 100% and that the original state is completely restored after stretching.

Furthermore, the filter medium 1 formed of the above-mentioned material specifically has through-holes 3 having a pore diameter of about 10 μm or more and 100 μm or less and communicating directly to the back surface, a thickness of 1 mm or less, and a membrane surface porosity of 5.
% or more, but is not limited to this.

[Action of the invention]

In the filtration device of the present invention constructed as described above, as shown in FIG. As shown in Figure 2, if water for backwashing is supplied and the filter medium 1 is moved.

Since the ends of the filter medium 1 are fixed (not shown), the filter medium 1 expands, and therefore the through holes 3 become enlarged.

Note that the material forming the filter medium 1 is soft.

Since the degree of expansion changes due to slight pressure fluctuations and the through hole 3 expands and contracts, in order to prevent this, a supporting plate 4 made of a porous material is attached to one of the supporting plates 4 as shown in FIGS.
The support plate 4b may be placed in the immediate vicinity of the filter medium 1, and the support plate 4b may be placed a little apart from the filter medium 1.
As shown in FIG. 3, the filter medium 1 may have a shape that roughly follows the shape of the filter medium 1 when expanded (indicated by a dotted line).

〔Effect of the invention〕

According to the filtration device of the present invention, when the filter medium (2) is not expanded as shown in FIG. Since it cannot pass through the through hole 3, it will be filtered out, and on the other hand,
Even if the through hole 3 becomes clogged during this filtration process,
If you backwash by flowing the washing water in the opposite direction to that during filtration as shown in Figure 2, 21! The material 1 expands and as a result the through hole 3
Since the area is expanded, backwashing can be easily and completely performed.

In addition, in view of such effects, it is also clear that the diameter of the through-holes 3 may be adjusted by applying some physical force to the filter medium 1, not only by the pressure of washing water or the like. .

In addition, since the filter medium 1 is made of a stretchable material 2, it is easily restored once the above-mentioned backwashing is completed and the supply of washing water is stopped, and by repeating this process, filtration work can be carried out for a long period of time. There are also things to do.

Furthermore, in the filtration device of the present invention, since the shape etc. of the filter medium can be freely designed, the filtration area per volume can be increased, and since the filter medium is lightweight, the overall weight can be significantly reduced. It is growing.

[Other Examples]

Therefore, the filtration device of the present invention is not limited to the above-mentioned embodiments; for example, as shown in FIG. 5a
, 5b may be provided with a plurality of filter media 1.

In this case, if the raw water is supplied from the lower end 6 of the filtration chamber 5, the raw water flows through the filter medium 1 when flowing from the channel 7 to the channel 8.
The filtrate flows out from the upper end 9 of the filtration chamber 5 (Fig. 4a). On the other hand, if washing water is supplied to the channel 8 side, each filter medium 1 expands and the clogging components are removed together with the washing water. Channel 7
The liquid is then discharged into the container (FIG. 4b), and in this way filtration and backwashing are performed alternately.

Further, in the filtration device of the present invention, the shape of the filter medium 1 can also be changed.

That is, for example, as shown in FIG. 5, an appropriate number of cylindrical filter media 1a are inserted into the filtration chamber 10, raw water is supplied to the channel 11 outside the filter media 1a, and washing water is supplied to the channel 12 inside. In the filtration apparatus of the present invention having such a configuration, when the stock solution flows from the channel 11 to the channel 12, it is filtered by the filter medium 1a (Fig. 5a), and the washing water is When the filter medium 1a flows from the flow path 12 to the flow path 11, the filter medium 1a is expanded to perform complete backwashing (FIG. 5b), and thus operates in the same manner as in the previous embodiment.

Note that the separate devices of the present invention shown in FIGS. 4 and 5 are capable of increasing the filtration efficiency compared to the size of the entire device, but in these devices, the support plate 4
The degree of expansion and contraction of the filter medium 1 or 1a may be regulated by disposing the filter medium 1 or 1a.

Furthermore, in the apparatus of the present invention having a plurality of filtration chambers, continuous filtration work is possible by alternately supplying raw water and washing water to each filtration chamber. You can also.

For example, as shown in FIG. 6, a plurality of filtration chambers 13a,
A plurality of filter media 1 are arranged in the interior of the filter 1, and raw water or washing water is supplied to and discharged from the flow passages 14 and 15 formed in this manner through opening/closing means 16 such as electromagnetic valves.

The operation of the filtration device of the present invention in this case will be explained as follows.
First, for the left filtration chamber 13a, open the opening/closing means 16 on the raw water supply side and discharge side, and close the same 16 on the wash water supply side and discharge side.On the other hand, for the right filtration chamber 13b, By opening the Un opening/closing means 6 on the side and opening the same 16 on the washing water supply side and the discharge side (Fig. 6a), filtration is performed in the left filter chamber 13a, and backwashing is performed in the right filter chamber 13b. In addition, if the opening/closing state of the opening/closing means 16 is reversed to the above (Fig. 6b), backwashing will be performed in the left filter chamber 13a, and filtration will be performed in the right filter chamber 13b. By switching the opening/closing means 16 in this manner, at least the negative filtration chamber is filtering the raw water, making it possible to continuously filter the raw water.

As described above, the present invention is extremely excellent as a filtration device.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of a filter medium used in the filtration device of the present invention, FIG. 2 is a side view showing an example of the filtration device of the present invention, and FIG. 3 is a side view showing the filtration device of the present invention separately. 4 is a side view showing the same separate unit, FIG. 5 is a side view showing another separate unit, and FIG. 6 is a side view showing still another separate unit. 1, la...Filtering medium 3...Through hole 4...Support plate 5.10.13・Filtration chamber 7, 8.11, 12, 14
．． 15... Channel 16... Opening/closing means

Claims (1)

[Scope of Claims] 1. A filter medium formed by drilling an appropriate number of through holes of an appropriate diameter in an expandable base is used, and the through holes expand at least during backwashing and contract after the end of backwashing. A filtration device comprising: 2. The filtration device according to claim 1, wherein the filter medium has a support plate nearby for regulating the degree of expansion and contraction of the filter medium. 3. Claim 1 or 2, in which the filter medium is in the form of a flat plate.
The filtration device described in section. 4. Claim 1 or 2, wherein the filter medium is cylindrical
The filtration device described in section. 5. The filtration device according to any one of claims 1 to 4, wherein a plurality of filter media are arranged for a plurality of fluid channels.