JPH0544771Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for measuring the volume concentration of sedimentary suspended solids.

[Conventional technology]

Measuring the settling ability and volumetric concentration of suspended solids in a liquid is essential for the design and maintenance of various solid-liquid separators. The latter is measured by the interface height when the sedimentation interface is stable.

That is, to measure the settling properties of suspended solids, the suspension filled in a designated measurement container was left in a gravitational or centrifugal field, and then the interface position was measured by visual observation at designated time intervals, and the settling velocity was calculated from the time derivative.

On the other hand, as a volume concentration measuring device, a light-transmissive cylindrical measurement container is installed vertically, a sample liquid containing sedimentary suspended matter is collected in this container, and the sample solution is left to stand for a predetermined period of time. At the interface between the substance and the supernatant,
A device is used that measures the volume concentration of suspended solids by optically measuring the height from the bottom of the container, and this type of device is also used to measure the sedimentation properties of suspended solids. has been done.

In this device, for example, a valve is provided at the bottom of the measurement container, and an introduction pipe for the sample liquid is connected to this valve, and when measuring the volume concentration, the sample liquid is sucked up through the introduction pipe and the valve. After confirming that the sample liquid overflows from the upper end of the measurement container, the valve is closed and the sample liquid is allowed to stand, and the interface between the suspended solids phase that has settled and the supernatant liquid phase is detected. By measuring the height of the (interface) from the bottom of the measurement container, the volume concentration is measured by calculating the ratio of the volume of the suspended solids phase to the total volume of the sample liquid.

[Problem that the invention attempts to solve]

It is important that such a measuring device be able to measure the volume of the suspended solids phase quickly, accurately and economically, regardless of the height of the interface, and for this purpose the reference plane for this volume measurement, i.e. the bottom of the container, is important. needs to be horizontal. However, when a commercially available valve is installed, a gap appears between the bottom of the measurement container and the valve.
The height reference plane is not clear, and even if the volume of this part is measured and corrected in advance, it may become impossible to measure if the volume concentration of the liquid is small, or sedimentation may flow back from the inlet pipe. There were problems such as increased errors.

Other measuring devices are used in which the sample liquid is introduced from above the container or from the upper side wall of the container, but these devices are troublesome to clean and require replacement. There were problems such as the difficulty and the tendency for errors to appear in the measured values of volume concentration.

An object of the present invention is to provide a volume concentration measuring device for sedimentary suspended solids that solves the above-mentioned problems of conventional devices.

[Means for solving problems]

The present invention is equipped with a cylindrical measuring container installed in the vertical direction and an interface position measuring device installed near the side wall of the container. At the same time, an on-off valve is inserted into the container and can rotate or rotate about a vertical line to open and close the connection opening of the introduction pipe, and the on-off valve has an upper end surface that is connected to the container. a valve stem forming a horizontal bottom surface; integral with the upper part of the valve stem;
and a valve body that extends in the axial direction of the container, has a horizontal cross-sectional shape that is uniform in the axial direction of the container, and is slidable on the inner peripheral surface of the container. This is a device for measuring the volume concentration of sedimentary suspended solids.

〔Example〕

An embodiment of the present invention will be explained based on FIGS. 1 and 2. 1 is a straight cylindrical structure made of glass or other light-transmitting material that allows optical observation of the sedimentation status of suspended substances. The measurement container is provided in a vertical direction, and its bottom part is a recessed part 10 having smaller inner and outer diameters than the upper part.

The upper end of this measurement container 1 (hereinafter abbreviated as "container") is completely opened, and the opening serves as an overflow outlet for the suspension sample. A discharge part 4 including the sample discharge pipe 3 is provided surrounding the upper end of the container 1,
A wash water inflow pipe 5 for washing the container 1 is connected to the discharge section 4 .

Further, a light source 6 and a condensing lens 7 that converts the light emitted from the light source into parallel light are provided near the side wall of the container 1 and near the area where the sedimentation interface is formed. At a position opposite to the light source 6 and the like, a light-receiving element 8 is provided that can detect the position of change in the amount of light transmitted through the sample in the container 1, that is, the interface position.

Furthermore, an inlet tube 2 for introducing a suspension sample is connected to a side wall of the container 1 immediately above the recess 10 .

Therefore, inside the container 1, an on-off valve 9, which is vertically elongated from the upper part to the recess 10 and has a substantially U-shaped vertical cross section, is provided by being inserted from the upper end opening of the container 1. There is.

The on-off valve 9 includes a cylindrical valve stem 9b whose outer diameter is slightly smaller than the inner diameter of the recess 10, and a cylindrical valve stem 9b that is integrally attached to the upper part of the valve stem and extends in the axial direction (longitudinal direction) of the container 1. Two valve bodies 9a, 9a provided
The valve stem 9b is configured with a plurality of permanent magnets arranged radially around the center line of the container 1, and the upper end surface of the valve stem 9b is substantially parallel to the horizontal direction of the container. It forms the bottom surface.

The valve bodies 9a, 9a have the same shape and dimensions, have an arcuate horizontal cross-sectional shape that is uniform in the axial direction of the container 1, and are slidable against the inner circumferential surface of the container. They are arranged symmetrically to each other with respect to the center line. Therefore, these valve bodies 9a, 9a
The connecting opening of the introduction tube 2, that is, the introduction port for the suspension sample can be opened and closed by the sliding movement.

Further, a magnetic force generating device 11 is provided outside the recess 10 of the container 1 to surround the recess.
In this magnetic force generating device, a plurality of electromagnetic coils are divided in the circumferential direction and provided radially around the recess 10 as magnetic force generating members, and a part of these electromagnetic coils is excited to pole the permanent magnet of the valve stem 9b. The on-off valve 9 can be closed by generating an attractive force or a repulsive force between the
The introduction port can be opened and closed by rotating or pivoting at angular intervals of 90°.

That is, as shown in FIG. 2, the direction of the parallel light from the condenser lens 7 shown by the straight line A and the extension of the center line of the introduction tube 2 are orthogonal to each other, and one of the valve bodies 9a is When the opening of the introduction pipe 2 is closed in the position shown in FIG. The incidence will be blocked.

As described above, in this embodiment, the inner peripheral surface of the container 1 forms a cylindrical surface and the bottom surface forms a horizontal surface, and the on-off valve 9 is closed in the range from the bottom surface to the upper end of the valve body 9a. In this case, the cross-sectional area of the internal space of the container 1 along the horizontal plane is uniform. Therefore, within the above range, since the height of the interface and the volume concentration are in a proportional relationship, measurement of the volume concentration becomes extremely simple and the measurement accuracy is also greatly improved.

In the present invention, only one valve body 9a is provided, this valve body is extended to the upper end of the container 1,
The magnetic force generator may be disposed directly below the valve stem 9b, or the introduction pipe 2 may be provided with a conduit having an automatic opening/closing valve.
It is also possible to make a branch connection, with one pipe opening at the sample liquid discharge point and the other at the sample liquid collection point. Measuring instruments can also be applied.

Further, the valve stem is a simple cylindrical body, penetrates the bottom of the container 1 and protrudes downward, and the protrusion is configured as a rotating shaft, which is rotated at 90° intervals by a separately provided drive mechanism. You can also do this. However, in this case, it is necessary to seal the liquid inside the container at the penetrating portion of the container.

Further, as shown in the illustrated example, it is preferable to attach a scrubbing member 9c made of cloth or flocked material to the outer circumferential surface of the valve body 9a, which has the advantage that the inner circumferential surface of the container 1 can be scrubbed when the on-off valve is opened and closed. be.

The introduction pipe 2 opens into a storage tank (not shown) for the suspension liquid, and the discharge pipe 3 opens into a storage tank (not shown) for the overflow liquid, the inside of which can be depressurized by a vacuum pump. , see specification of patent application No. 173849/1983)
The cleaning water inflow pipe 5 is opened at the upper part of the interior and is connected to a cleaning water supply pump (not shown).

Next, to explain the operation of the above device, the relationship between the height of the interface in the container 1 and the volume concentration of suspended solids will be clarified in advance. To do this, the container 1 is filled with water and its volume V _O is measured, and then after the container 1 is completely emptied, _a known amount of water is filled in, and the height of the water surface H _O is measured.

From the above, when the height of the interface is H, the volume concentration is
C _H is expressed as C _H = 1/V _O ×v _O /H _O ×H, and since V _O , v _O and H _O are constant values, C _H is the installation height of the valve body 9a. Since it is in a proportional relationship with H within this range, measurement of volume concentration becomes extremely simple.

Although there is no particular limit to the height of the valve body 9a, it is usually set within the actual volume concentration measurement range.

Therefore, in measuring the volume concentration, after opening the on-off valve 9 and making the container 1 almost empty, the pressure inside the storage container is reduced and the suspension sample is passed through the introduction tube 2 into the container 1. This introduction is carried out in container 1.
The process is continued until the sample liquid overflows and a predetermined amount of overflow liquid flows into the storage container.

Next, after closing the on-off valve 9 and returning the storage container to normal pressure, the sample liquid in the container 1 is allowed to stand for a predetermined period of time to allow the suspended matter to settle until it reaches an equilibrium state. When the sedimentation is completed, the height of the interface is detected by an optical interface position measuring device composed of a light source 6, a condensing lens 7, a light receiving element 8, etc., and a volume concentration calculation device (not shown) provided separately is used to detect the height of the interface. Calculate the volume concentration based on the formula for _CH .

After measuring the volume concentration, the on-off valve 9 is opened to discharge the sample liquid, and the inside of the container 1 is washed by jetting out washing water from the washing water inlet pipe 5. In this case, the valve body 9a
If the cleaning member 9c is provided, the inner circumferential surface of the container can be effectively cleaned by opening and closing the valve body, and there is an advantage that the number of times the container needs to be cleaned can be reduced.

Note that if the container 1 is heavily soiled, it may be pulled upward, removed from the magnetic force generator 11, and cleaned at another location.

[Effect of idea]

In the volume concentration measuring device of the present invention, a predetermined on-off valve is inserted into the measuring container, and the bottom surface of the measuring container, that is, the reference surface for measuring the volume of the suspended solids phase, coincides with the horizontal plane, and the precipitated matter in the measuring container is If the interface is within the range where the valve body of the on-off valve is located, the interface height and volume concentration are in a proportional relationship, so the volume concentration can be measured. In addition to being extremely simple and economical to carry out, measurements can be made quickly and accurately even when the volume concentration is extremely low and the interface is located near the bottom of the measurement container, and the measurement container can be easily cleaned. The structure is simple, maintenance is easy, and the above-mentioned problems of conventional devices can be effectively solved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the - line. DESCRIPTION OF SYMBOLS 1...Measurement container, 2...Introduction pipe, 3...Discharge pipe, 4...Discharge part, 5...Washing water inflow pipe, 6...
Light source, 7... Condensing lens, 8... Light receiving element, 9...
...Opening/closing valve, 9a... Valve body, 9b... Valve stem, 9c...
... scrubbing member, 10 ... recess, 11 ... magnetic force generating device.

Claims (1)

[Claims for Utility Model Registration] (1) A device comprising a cylindrical measuring container installed in the vertical direction and an interface position measuring device installed near the side wall of the container, which is suspended from the lower side wall of the container. An on-off valve is connected to the inlet tube for the turbid liquid sample, and an on-off valve that can rotate or rotate about a vertical line to open and close the connection opening of the inlet tube is inserted into the container. , a valve stem whose upper end surface forms a horizontal bottom surface of the container; and a valve stem that is integral with the upper part of the valve stem and extends in the axial direction of the container, and has a horizontal cross-sectional shape that is uniform in the axial direction of the container. 1. A volume concentration measuring device for sedimentary suspended solids, comprising a valve body that is slidable on the inner circumferential surface of the container. (2) the container is made of a transparent material;
The measuring device according to claim 1, wherein the interface position measuring device is an optical interface position measuring device. (3) The measuring device according to claim 1 or 2, wherein the opening/closing valve is configured by two valve bodies having the same shape and size arranged symmetrically with respect to the center line of the container. . (4) The valve body of the opening/closing valve is rotatable or rotatable at 90° intervals about the center line of the container, as claimed in claim 1, 2, or 3 of the utility model registration.
Measuring device as described in section. (5) The on-off valve includes a valve stem in which a plurality of permanent magnets are arranged radially around the center line of the container, and a magnetic force generator installed directly below or surrounding the valve stem. 5. The measuring device according to claim 4, wherein the magnetic force generating device is constructed by radially arranging a plurality of magnetic force generating members around a vertical line. (6) The measurement according to any one of claims 1 to 5, wherein the valve body of the on-off valve is provided with a scrubbing member capable of scrubbing the inner circumferential surface of the container. Device.