JP2001246205A - Filter apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter apparatus extended in the maintenance cycle of a sample liquid treatment part. SOLUTION: In this filter apparatus constituted so that a sample liquid to be filtered is allowed to flow in a tank and the filtered sample liquid is allowed to flow out, a sample lead-out pipe inserted into the tank at one end thereof, the filter provided to the leading end of the lead-out pipe, a changeover valve provided on the way of the lead-out pipe and a pump for sending out air to the filter through the changeover valve are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration apparatus suitable for use in a pretreatment step of an analyzer such as a total nitrogen and total phosphorus meter used in a sewage treatment plant or the like.

[0002]

2. Description of the Related Art Conventionally, as a filter of this type, a filter shown in FIG. 3 is known. In FIG. 3, reference numeral 1 denotes a tank having an inner diameter of 70 mm and a length of about 250 mm, for example.
This tank contains a predetermined amount (for example, about 1 liter) of tap water (about 1 mm in diameter) 2. Reference numeral 3 denotes an overflow port provided above the tank.

[0003] Reference numerals # 1 and # 2 denote on-off valves for sample liquid.
For example, one of the liquid before the treatment and the liquid after the treatment is stored in the tank 1
Flows into. F1 is a filter provided below the tank and in the middle of the three-way valve SV3, and one of the SV3 is connected to an analyzer (for example, a total nitrogen and total phosphorus meter) 7 via a pump 6.

[0004] 4 is a pressure reducing valve of purified water, SV1 and SV2 are solenoid valves, one of these solenoid valves is connected to the pressure reducing valve 4, SV
The other of the two is connected below the tank, and the other of the SV2 is connected via a filter F2 to one connection port of a three-way valve SV3.

In such a configuration, in the initial state, the solenoid valves SV1 and SV2 are closed, and the three-way valve SV3 has a path from the filter F1 to the pump 6 opened. Then, the sample liquid that has passed through one of the sample on-off valves # 1 and # 2 flows in from above the tank 1 and is filtered by the sand 2,
It flows to the filter F1 → the three-way valve SV3 → the pump 6 → the analyzer 7 side.

Further, in such a configuration, dust 2 and microorganisms contained in the sample liquid cause the sand 2 to be muddy and the filter F1 to be clogged. In such a case, the solenoid valve S
V1 is opened, purified water is flowed in from below the tank 1 and bubbling is performed, and contaminated water containing dust and microorganisms separated from the sand 2 overflows from the overflow port. Thereafter, or simultaneously, the solenoid valve SV2 is opened to open the three-way valve. The SV3 is switched to the filter F1 side, and the filter F1 is backwashed so that the purified water flows in from below the tank 1.

[0007]

By the way, in the filter having such a configuration, 0.1 μm is used as the filter F1.
Since a hollow fiber membrane filter of about m is used, clogging of the filter occurs, and dust and microorganisms adhere to the tap sand 2 to form a semi-kneaded state, which makes it difficult to peel off by bubbling and reduces the filtering effect. There was a problem. further,
There was a problem that replacement of the tap sand 2 was troublesome.

The present invention has been made in order to solve the above-mentioned problems, and has as its object to provide a filtration device in which a maintenance cycle of a sample liquid processing section is lengthened.

[0009]

In order to solve such a problem, in a first aspect of the present invention, there is provided a filtering apparatus having a structure in which a liquid to be filtered flows into a tank and the filtered liquid flows out. A liquid outlet pipe having one end inserted into a tank, a filter provided at a tip of the outlet pipe, and a switching valve provided in the middle of the outlet pipe,
A pump for delivering gas to the filter via the switching valve is provided.

According to a second aspect of the present invention, in the filtering device according to the first aspect, the filter is a wire mesh and has a predetermined volume. According to a third aspect of the present invention, in the filtration device according to the first aspect, the material of the filter is a copper alloy or stainless steel formed in a cylindrical shape, and both ends are fixed to a flat plate.

According to a fourth aspect of the present invention, there is provided the filtration device according to the first aspect, wherein the filter is fixed via a flat plate, and is attachable to and detachable from an outlet pipe. According to a fifth aspect of the present invention, there is provided the filtration device according to the first aspect, wherein the filter has a mesh of about 250.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing the configuration of the filtration device of the present invention. Note that the same elements as those of the conventional example shown in FIG. 3 are denoted by the same reference numerals, and redundant description will be omitted.

In FIG. 1, reference numeral 10 denotes a filter made of a wire mesh having a mesh of about 250 μm, which is fixed to one end of a pipe 11 inserted from above the tank 1. The other end of the pipe 11 is connected to one connection port of the three-way valve SV3.

FIG. 2 is a detailed view of the wire mesh filter 10,
This filter has disk-shaped flat plates 10a and 10b having a diameter of 30 mm and a thickness of approximately 1 mm at both ends, and is formed by winding a wire net 10e having a length (L) of approximately 50 mm around the outer periphery of the flat plates.

A screw hole 10c for screwing one end of the pipe 11 is formed in the upper flat plate 10a. Such a wire mesh filter 10 can be easily attached to and detached from the pipe 11. The material of the flat plate is stainless steel, and the material of the wire mesh is copper alloy or stainless steel. An air pump 12 is connected to one connection port of a three-way valve SV3 via an electromagnetic valve SV4.

Returning to FIG. 1, in the initial state, SV1, SV
2, SV4 is closed and the three-way valve SV3 is a wire mesh filter 1
A path from the 0 side to the pump 6 through the pipe 11 is opened. The sample liquid that has passed through one of the on-off valves # 1 and # 2 flows in from below the tank 1, is filtered by the wire mesh filter 10, and flows to the analyzer 7 side.

In such a configuration, dust and microorganisms contained in the sample liquid adhere to the outer periphery of the wire mesh filter 10 and cause clogging as in the related art. In such a case, the path of the three-way valve SV3 is switched by opening the solenoid valve SV4, and air is bubbled into the wire mesh filter 10 via the pipe 11 to detach the attached dust and microorganisms from the wire mesh.

In this case, since the present invention has a predetermined volume as shown in FIG. 2 and uses a wire mesh filter 10 made of copper alloy or stainless steel having a mesh of about 250 μm, the degree of progress of clogging is moderate. It will be.

Thereafter or during bubbling, the solenoid valve S
When V1 is opened, purified water flows from below the tank 1 and dust and microorganisms separated from the wire mesh filter 10 overflow from the overflow port 3 to remove contaminated water from the tank. Next, SV1 and SV4 are closed, SV2 is opened and pipe 1
Fill 1a with purified water.

According to the above-described structure, if a copper alloy having toxicity to microorganisms is used as the wire mesh filter 10, there is an effect that microorganisms are hardly adhered and stainless steel is hardly rusted. Further, a mesh having a mesh of about 250 μm can prevent dust from being clogged for a long time without hindering the analysis of sewage, and is effective in removing air by bubbling. Further, it is also possible to make the wire mesh filter 10 detachable so that clogging can be removed by hand washing at predetermined intervals.

The foregoing description of the present invention has been presented by way of illustration and example only and in certain preferred embodiments. Accordingly, the present invention has many modifications, without departing from its essence,
It will be apparent to those skilled in the art that variations can be made. The scope of the present invention, which is defined by the description in the appended claims, is intended to cover alterations and modifications within the scope.

[0022]

As described above, according to the present invention, in a filtration apparatus having a structure in which a sample liquid to be filtered flows into a tank and the filtered sample liquid flows out, one end is inserted into the tank. The sample liquid outlet pipe, a filter provided at the end of the outlet pipe, a switching valve provided in the middle of the outlet pipe, and a pump for sending gas to the filter side through the switching valve are provided. Therefore, the maintenance cycle of the sample liquid processing section can be lengthened.

Further, the filter is made of a copper alloy or stainless steel wire mesh having a mesh of about 250 and is formed so as to have a predetermined volume, and is attachable and detachable from the lead-out pipe via a flat plate. The substance itself is toxic to microorganisms, so that there is an effect that microorganisms are hardly attached and stainless steel is hardly rusted.

The mesh having a mesh size of about 250 μm can prevent clogging of dust for a long time without hindering the analysis of sewage, and is effective in removing air by bubbling of air. As a result, it is possible to realize a filtering device in which the maintenance cycle of the sample liquid processing unit is lengthened. Furthermore, since the wire mesh filter 10 is detachable, clogging can be removed by hand washing at predetermined intervals.

[0025]

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an example of an embodiment of a filtration device of the present invention.

FIG. 2 is a configuration diagram illustrating an example of an embodiment of a filter.

FIG. 3 is a configuration diagram illustrating an example of a conventional filtration device.

[Explanation of symbols]

 Reference Signs List 1 tank 3 overflow port 4 pressure reducing valve 6, 12 pump 7 analyzer 10 wire mesh filter 11 pipe F2 filter # 1, # 2 on-off valve SV1, SV2, SV4 solenoid valve SV3 three-way valve

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01D 29/10 510C 520A 530A

Claims (5)

[Claims] 1. A filter device having a structure in which a sample liquid to be filtered flows into a tank and the filtered sample liquid flows out, wherein the sample liquid outlet pipe having one end inserted into the tank and the outlet pipe are provided. A filter provided at the tip of the filter, a switching valve provided in the middle of the outlet pipe, and a pump for sending out gas to the filter via the switching valve. 2. The filtering device according to claim 1, wherein the filter is a wire mesh and has a predetermined volume. 3. The filtering device according to claim 1, wherein the material of the filter is a copper alloy or stainless steel formed in a cylindrical shape, and both ends are fixed to a flat plate. 4. The filter according to claim 1, wherein the filter is fixed to the outlet pipe via a flat plate, and is detachable from the outlet pipe. 5. The filter according to claim 1, wherein the filter has a mesh of about 250.