JPH09145560A - Filter device for oil concentration sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil concentration sensor which is less contaminated even when the remaining amount of liquid after a sample is discharged is small and the using amount of a solvent is small and a contaminated state of which can be confirmed from outside. SOLUTION: In a filter apparatus 1, two housing blocks 2, 3 with liquid paths 2a, 3a and air paths 2b, 3b, and a filter 4 held between the two housing blocks 2 and 3 for separating water from a solvent are arranged. A projection 2c for holding the filter and a predetermined recessed part 2d are formed at the center of the housing block 2. A filter-retaining projection 3c, a predetermined recessed part 3d and a filter-retaining projection 3e in a peripheral edge part of the recessed part 3d are formed at the center of the other housing block 3. Moreover, a groove 3g is formed in the vicinity of the whole outer periphery of the recessed part 3d of the other housing block 3. The housing blocks 2 and 3 are transparent bodies.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter device for separating water from a solvent used in an oil concentration meter for measuring the concentration of oil present in water, particularly to reduce the amount of solvent used and the number of measurements. The present invention relates to a filter device that can increase

[0002]

2. Description of the Related Art An oil concentration meter is used to measure the concentration of oil contained in water. The measurement is carried out by adding a fluorine-based solvent to the sample water, separating the water and the solvent in which the oil component is dissolved by a filter device, introducing the solvent into an infrared analyzer, and analyzing the absorption spectrum.

That is, in the oil concentration meter, as shown in FIG. 4, a mixed solution of 20 cc of sample water and 10 cc of solvent is put in a container 30 and is sent by a valve 32 to the filter device 1 for water / solvent separation in fixed amounts. , The solvent in which water and oil are dissolved is separated by the filter device 1, and the solvent is guided to the sample cell 31 and irradiated with infrared rays. Then, the oil concentration is measured by analyzing the infrared absorption spectrum absorbed by the bond of carbon and hydrogen constituting the oil in the solvent. Reference numeral 33 is a separated water discharging valve, and 34 is a separated solvent discharging valve.

[0004]

In the oil concentration meter, it is desired to reduce the amount of solvent used, but in the conventional filter device for separating water and solvent, the inside of the housing containing the filter should be as small as possible. I was dealing with it by making it smaller. Therefore, there is a problem that the gap between the filter and the housing becomes small, and a large amount of liquid remains around the inner corner due to surface tension at the time of discharge, resulting in contamination. For example, when an amount of about 30 cc was used as described above, about 3 cc was used for one sample analysis, but such contamination allowed only two analyzes. In addition, since the housing is also made of an opaque material, there is an inconvenience that the dirt of the filter cannot be confirmed.

The present invention has been made by paying attention to the above-mentioned problems. The residual liquid at the time of discharging the sample is small, the contamination is small even when the solvent usage fee is small, and the contamination state from the outside is small. It is an object of the present invention to provide a filter device for an oil concentration meter that can be confirmed.

[0006]

In order to solve the above-mentioned problems, the present invention provides two housing blocks having a passage for liquid flow and a passage for air therein, and between these two housing blocks. In a filter device for an oil concentration meter, which is sandwiched between and is provided with a filter for separating water and a solvent, a predetermined recess is formed in the center of one of the two housing blocks, and the other housing block. A predetermined concave portion in the center of the and a projection for pressing the filter is formed on the peripheral portion of the concave portion,
Further, a groove is formed over the entire circumference in the vicinity of the outer circumference of the recess formed in the other housing block. In addition, a filter pressing protrusion is formed at the center of each of the two housing blocks. Alternatively, one or both of the two housing blocks are transparent.

If the filter device for the oil concentration meter is used as the means, the space between the filter and the housing block and the volume of the space are increased. However, the increase in capacity due to this groove does not increase the amount of solvent used because it is only in the vicinity of the outer periphery of the filter. Further, according to the means, when the sample liquid is filtered, the filter does not completely adhere to one of the housing blocks, and it is possible to maintain an appropriate space on both sides. It can be fully demonstrated. Further, according to the means (1), it is possible to easily confirm the state of dirt inside the housing block.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a filter device for an oil content meter of the present invention, and FIG. 2 is AA of FIG.
FIG. 3 is an enlarged view of part P in FIG. A filter device 1 for water / oil separation used in an oil concentration meter includes two housing blocks 2 and 3 having passages 2a and 3a for liquid flow and passages 2b and 3b for air therein, and two of these housing blocks. A filter 4 which is sandwiched between housing blocks to separate water and a solvent, pipe joints 5 and 6 attached to the liquid passages 2a and 3a, and pipe joints 7 attached to the air passages 2b and 3b. 8 and. One or both of the two housing blocks 2 and 3 are made of transparent synthetic resin or a transparent body of glass. Further, the filter 4 is made of a fluorine resin material, for example, polytetrafluoroethylene (PTFE).

At the center of the one housing block 2, a protrusion 2c for pressing a filter is formed and a recess 2d having a predetermined radius is formed. Further, the protrusion 3c for pressing the filter is also provided in the center of the other housing block 3.
And a concave portion 3d having a predetermined radius are formed, and further, a filter pressing projection 3e for pressing the vicinity of the outer peripheral edge of the filter 4 is formed on the peripheral portion of the concave portion 3d.
A flat portion 3f that is slightly lower than the outer peripheral edge of the other housing block 3 is formed on the inner diameter side, and a flat convex portion that fits exactly on the flat portion 3f from the outer peripheral edge to the inner diameter side on the one housing block 2. 2e is formed,
A packing 9 is provided between the flat portion 3f and the flat convex portion 2e.
Is pinched.

The filter 4 is sandwiched by the projections 2c, 3c on both sides of the center of the housing blocks 2, 3 and the peripheral edge is pressed by the filter pressing projection 3e provided on the other housing block 3. In this way, on both sides of the filter 4, a space for liquid storage is formed by the recesses 2d and 3d provided in the two housing blocks 2 and 3. When the sample solution is filtered, the filter 4 does not entirely adhere to one of the housing blocks, and it is possible to maintain an appropriate space on both sides. That is, if the filter 4 is sandwiched by the protrusions 2c and 3c provided at the center of the two housing blocks 2 and 3, the filter function can be sufficiently exhibited. It should be noted that the protrusions 2c and 3c may not be provided and the filter 4 may be held only by the filter holding protrusion 3e.

Next, in the vicinity of the outer periphery of the recess 3d formed in the other housing block 3, the groove 3 is formed over the entire periphery.
g is formed. This groove 3g allows the filter 4
The space between the housing and the housing block 3 and the capacity of the recess 3d are increased. However, since the capacity increase due to the groove 3g is only in the vicinity of the outer periphery of the filter 4, the amount of solvent used is not increased.

The filter device for an oil concentration meter according to the present invention has the above-described structure, and the two housing blocks 2 and 3 are assembled by the bolts 10 and 11 with the filter 4 and the packing 9 sandwiched therebetween. The sample liquid is introduced from the pipe joint 5, is accumulated in the recess 2d through the passage 2a, is separated into water and the solvent in which the oil is dissolved by the filter 4, and the separated solvent is passed through the passage 3a to form the pipe joint. 6 and is introduced into an analysis cell 31 (see FIG. 4) where it is analyzed. In addition, the remaining water is stored in the valve 33.
To be discharged. In this case, the housing block 3
By the groove 3g formed in the above, the influence of the surface tension is reduced and the residual amount of the solvent is also reduced.

[0013]

As described in detail above, according to the filter device for an oil content meter of the present invention, when measuring the oil content, the number of measurements can be further increased with almost the same amount of solvent as in the conventional case. Therefore, the accuracy of the concentration measurement of the oil concentration meter can be improved accordingly. Further, the amount of solvent remaining in the housing is reduced, and the contamination can be significantly reduced. In addition, since a transparent material is used for the housing block, it is possible to easily check the state of dirt inside.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a filter device for an oil concentration meter according to the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is an enlarged view of a lower portion of the filter device of FIG.

FIG. 4 is a block diagram of a conventional oil concentration meter.

[Explanation of symbols]

 1 Filter Device 2 Housing Block 2c Projection 2d Recess 3 Housing Block 3c Projection 3d Recess 3e Filter Holding Projection 3g Groove 4 Filter

Claims (3)

[Claims] 1. An oil component comprising two housing blocks having a liquid passage and an air passage therein, and a filter sandwiched between the two housing blocks to separate water and a solvent. In the filter device for a densitometer, a predetermined concave portion is formed in the center of one of the two housing blocks, and a predetermined concave portion is formed in the center of the other housing block and a filter pressing member is provided at a peripheral portion of the concave portion. A filter device for an oil concentration meter, characterized in that a protrusion is formed and a groove is formed over the entire circumference in the vicinity of the outer periphery of the recess formed in the other housing block. 2. The filter device for an oil concentration meter according to claim 1, wherein a filter pressing protrusion is formed in the center of each of the two housing blocks. 3. The fill device for an oil concentration meter according to claim 2 or 3, wherein one or both of the two housing blocks is a transparent body.