JPH019003Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a concentration measuring device for measuring the concentration of a suspension such as sludge.

Among suspension liquids, for example, in the case of sludge generated in a sewage treatment process, the liquid contains fine bubbles and gas bubbles. However, if such microbubbles or gas bubbles (hereinafter simply referred to as bubbles) are included, the actual concentration cannot be measured using methods that use ultrasonic waves, light, radiation, etc. to measure suspension concentration. If the value is above or below, it will cause an error in the measured value.

Therefore, in the concentration measurement of this type of suspension, the applicant has conventionally developed a method for measuring the concentration of a part of the sludge pipe itself, as shown in the first embodiment of Japanese Utility Model Application Publication No. 54-48693. A concentration measuring device that measures suspended concentration by closing two valves at an interval and installing a bypass line, and then pressurizing and defoaming between these two valves to a certain value. was used. That is, by pressurizing the suspension liquid, the saturated solubility of gas is increased, the air bubbles contained in the liquid are dissolved, and the influence of the air bubbles is removed.

Furthermore, as shown in the second example of the above publication,
The sludge pipe is connected to T without installing a bypass pipe.
It was also practiced to branch into a shape and provide a pressurized container.

However, in the case of the first embodiment of the above-mentioned publication, two valve mechanisms are required, and a bypass pipe must also be installed, so the device itself has to be enlarged. There was still room for improvement in terms of structural simplification.

In the case of the second embodiment of the above-mentioned publication, one valve mechanism is sufficient and there is no need to provide a bypass line, so it is possible to downsize the device and simplify the structure. However, this method has another problem in that it becomes very difficult to introduce a suspension suitable for sampling into a pressurized container in which the concentration is to be measured.

This idea was developed in view of the above circumstances, and it is possible to reduce the size of the device and sufficiently simplify the structure. ) It is an object of the present invention to provide a concentration measuring device that can smoothly introduce a suspension suitable for sampling into a container.

Hereinafter, the present invention will be explained with reference to the illustrated embodiments.

First, in FIG. 1, 1 is a sludge pipe that is integrated into a part of the main sludge pipe using a flange 2, and a substantially circular opening 3 is bored in one side of the sludge pipe. . For example, a hemispherical curved lid 6 is removably fixed to the opening 3 via a resilient spacer 4 that is resilient and capable of airtight contact, and a sensor mounting portion 5 by bolting or the like. has been done. An airtight movable membrane 7 made of an elastic material such as synthetic rubber is provided on the inside of the curved lid 6 and is fastened together with the sensor mounting part 5. The movable membrane 7 covers the surrounding area.

A pressurization source (not shown) is installed outside the concentration measurement chamber 8, and this pressurization source is connected to a suction hole provided in a part of the curved lid 6 when the rotary gate valve 14, which will be described later, is closed. By compressing and deforming the movable membrane 7 inward through the exhaust port 9, the inside of the concentration measurement chamber 8 can be pressurized. Note that as the pressure source, for example, air pressure is used, but other means such as hydraulic pressure may also be used.

Further, the sensor mounting portion 5 is provided with a concentration detection means 12 composed of an ultrasonic transmitter 10 and its receiver (or reflector) 11 disposed at positions facing each other. The detection signal is data transmitted to a recording device or the like and processed.

On the other hand, inside the elastic spacer 4 in contact with the opening 3, a rotary shaft 13 is rotatably supported by a predetermined angle (90°) in the axial direction of the sludge pipe line 1 in alignment with the opening surface. A rotating gate valve 14 is provided. The rotary gate valve 14 can be inscribed in the elastic spacer 4 as shown by the solid line or can be rotated to a vertical position as shown by the imaginary line, and by this operation, the suspension flowing through the sludge pipe 1 can be freely sampled. Moreover, the upper concentration measurement chamber 8 can be kept in a sealed state. When the elastic spacer 4 is completely expanded and closed as shown by the solid line in the figure, the above-mentioned internal sampling liquid can be sufficiently pressurized. That is, when pressurized air from a pressurized source is filled in through the intake/exhaust port 9 in this state, the sampling liquid is compressed and deformed inside the movable membrane 7, increasing the pressure to a predetermined value, compressing the bubbles, and further increasing the saturated solubility of the gas. increases, so air bubbles in the liquid dissolve. Therefore, when the concentration is measured under such pressure, measurement errors due to the inclusion of air bubbles, etc. are eliminated.

15 is a raised portion formed inside the sludge pipe line 1 at a position opposite to the rotary gate valve 14;
Reference numeral 6 denotes a driving means for rotating the rotary gate valve 14.

Next, the operation of this embodiment configured as described above will be explained. The suspension flowing through the sludge pipe 1 is caused by the raised portions 15 as shown by the arrows in FIG.
Guided or guided upwards. Therefore, in order to sample the suspension, the drive means 16
When the rotary gate valve 14 is opened by rotating it by 90 degrees, the rotary gate valve 14 in the open state and the raised portion 15 work together to guide and transmit the suspension to the concentration measurement chamber 8. Do the following. Therefore, the rotary gate valve 14
When the valve is opened, most of the suspension will flow through the concentration measurement chamber 8 into the sludge pipe 1. If the rotary gate valve 14 is returned to the horizontal position and closed in this state, the concentration will be reduced. In the measuring chamber 8, a suspension in a state of suspension substantially similar to that normally flowing through the sludge pipe 1 is collected, and a suitable sampling liquid can be obtained. Note that the sampling liquid remaining in the concentration measurement chamber 8 until then is discharged to the sludge pipe line 1 by the newly introduced sampling liquid.
So-called self-cleaning is performed.

In this manner, after a new sampling liquid is introduced into the concentration measuring chamber 8, the movable membrane 7 is compressively deformed through the suction/exhaust port 9 by the above-mentioned pressurizing source when the rotary gate valve 14 is closed. Then, the concentration measuring chamber 8 into which the sampling liquid, ie, the suspension liquid was introduced, is pressurized and defoamed. In this case, pressurization can be done by using a movable membrane 7 that freely adapts to the shape of the outer container such as a curved lid 6, and by deforming only the portion of the movable membrane 7 that comes into contact with the intake/exhaust port 9. Unlike the diaphragm member conventionally used, a space such as a pressure receiving chamber is not required. Therefore, it is advantageous in terms of space.

Next, in such a defoamed state, the ultrasonic transmitter 1 is
An ultrasonic wave is emitted from 0, and it is received by the opposite receiver (or reflector) 11, or reflected and this reflected signal is received by the transmitter 10, and the received signal that is attenuated according to the concentration is measured to detect contamination. The concentration is measured, and the results are used as control signals for extraction of precipitate contamination, chemical injection, etc. When the measurement is completed, the pressurized air is removed from the air supply/exhaust port 9, and the rotary gate valve 14 is rotated in preparation for the next measurement. Note that the air supply port and the air exhaust port may be provided separately. By repeating each step necessary for these measurements, the concentration can be continuously measured.

The above-mentioned operations such as rotation of the rotary gate valve 14, pressurization, defoaming, concentration measurement, etc. are automatically performed according to predetermined program instructions from a central monitoring and control device (not shown), for example. In addition, the transmitter 10
The surface of the receiver (or reflector) 11 is sufficiently cleaned at the time of changing the suspension measurement, so that it does not interfere with the measurement.

As described above, according to this invention, the concentration measurement chamber, which is equipped with a concentration detection means and covered by an airtight movable membrane, and the sludge pipe are separated by a rotary gate valve, and this airtight movable membrane is pressurized. The sludge pipe is compressed and deformed inward by the source, and a raised part is formed inside the sludge pipe to guide the introduction of the suspension into the concentration measurement chamber in cooperation with the rotary gate valve when the valve is opened. Therefore, the valve mechanism can be integrated into one, making it unnecessary to install a bypass pipe, and the suspension can be collected in almost the same suspended state as when it normally flows through a sludge pipe. be able to. Moreover, the concentration detecting means is composed of a pair of ultrasonic transmitters and receivers, and these ultrasonic transmitters and receivers are arranged at positions facing the side wall of the concentration measurement chamber between the airtight movable membrane and the rotary gate valve in the concentration measurement chamber. By establishing
The above-mentioned concentration detection means can independently perform an ultrasonic transmission and reception function, and if the transmission and reception function is provided as a part of the rotary gate valve, there are no problems with concentration detection, such as backlash of the rotary gate valve. This eliminates the inconvenience of impairing the concentration detection function due to adhesion or the like. Furthermore, since the concentration detection means is necessarily washed with the suspension when the rotary gate valve is opened, it always exhibits a stable and highly accurate concentration detection function. Therefore, it is possible to reduce the size of the device and simplify the structure, and furthermore, it is possible to realize a concentration measuring device that can smoothly introduce a suspension suitable for sampling.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a concentration measuring device showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view thereof. 1...Sludge pipe line, 7...Airtight movable membrane, 8...
Concentration measurement chamber, 12... Concentration detection means, 14... Rotary gate valve, 15... Protrusion.

Claims (1)

[Scope of utility model registration request] A concentration measurement chamber attached to a sludge pipe through which a suspension whose concentration is to be measured flows and communicates with the sludge pipe and bulges outward; and an airtight movable membrane stretched inside the concentration measurement chamber. , a rotary gate valve pivotably supported near a communication opening with the sludge pipe in the concentration measurement chamber so as to be rotatable at a predetermined angle in a direction for opening and closing the opening; the rotary gate valve and the airtight movable membrane; a concentration detection means consisting of a pair of ultrasonic transmitter/receivers disposed opposite to each other on the side wall of the concentration measurement chamber; A pressurizing source compresses and deforms the movable membrane inward and pressurizes the concentration measurement chamber in a state where the suspension is introduced. A concentration measuring device comprising: a protuberance that cooperates with a rotary gate valve to introduce a suspension into the concentration measuring chamber.