JPS6035029B2 - concentration meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a concentration meter for measuring the concentration of a liquid to be measured, such as sludge liquid, and in particular, to a concentration meter that measures the concentration of a liquid to be measured, such as sludge liquid, and in particular to a concentration meter that uses movement (dynamic pressure) of the liquid to be measured to pressurize and defoam the liquid to be measured. This invention relates to a concentration meter that measures the concentration of a liquid that flows into a chamber and is sealed.

Conventionally, in this type of concentration meter, as shown in FIG. 1, a bypass pipe 2 is disposed so as to fit into a pipe 1 through which the liquid to be measured flows, and a valve is installed in the middle of the bypass pipe 2. In this configuration, a concentration measuring section 5 is provided via 3 and 4. Although not shown, the concentration measurement unit 5 has an ultrasonic wave transmitter and a wave receiver built therein, and measures the concentration by receiving the amount of attenuation of the ultrasonic waves caused by the liquid to be measured with the wave receiver. are doing. By the way, since such a concentration meter cannot accurately measure the concentration due to the influence of air bubbles in the liquid to be measured, a pressurizing pipe 6 is provided and a pump P is used to supply gas to extinguish air bubbles. There is.

Therefore, when actually measuring the concentration of the liquid to be measured, after opening both valves 3 and 4 and introducing the liquid to be measured into the concentration measurement section 5, both valves 3 and 4 are closed and pressurized. After eliminating the bubbles, a transmitter emits ultrasonic waves, and a receiver receives the attenuation of the ultrasonic waves to measure the concentration of the liquid to be measured.
However, in the concentration meter described above, both the valves 3 and 4 provided on the inlet and outlet sides of the liquid to be measured must be closed, so operation is not easy. If you forget to close valve 3 or 4, accurate concentration measurement will not be possible.

Furthermore, if one valve 4 is closed later than the other valve 3, a layer of liquid to be measured and an air layer will be created between the two valves 3 and 4, and not only will an appropriate pressurized state not be obtained, but also depending on the installation state. However, this method has drawbacks such as an air layer intervening in the ultrasonic path, resulting in measurement errors. Therefore, in order to avoid the above-mentioned inconvenience, instead of using the two valves 3 and 4, a valve is provided between the piping and the pressurized defoaming chamber, and the liquid to be measured is introduced into the pressurized defoaming chamber. The concentration of the liquid to be measured is measured by reducing the pressure with a pump and pulling the valve apart, and then putting the liquid to be measured into a pressurized defoaming chamber to defoam the bubbles.

Another example is to install a ball valve on the side of the pipe that has a flow path and a pressurized defoaming chamber with a concentration measuring section, and normally a part of the liquid to be measured is allowed to flow through the flow path of the ball valve. During measurement, the ball valve is manually rotated to close the piping, and the liquid to be measured in the flow path of the ball valve is pressurized to eliminate bubbles, and then the concentration is measured in the concentration measuring section. .

．． However, the two concentration meters mentioned above are passive in that they use a pump etc. to introduce the liquid to be measured into a pressurized defoaming chamber, and the latter one in particular has a complicated valve structure. There are some problems with manufacturing.

The present invention has been made in view of the above-mentioned circumstances, and includes a pressurized defoaming chamber having a concentration measuring means so that the liquid to be measured can freely flow into the side wall of the piping, and movement of the fluid flowing inside the piping. The purpose of the present invention is to provide a concentration meter that automatically introduces a liquid to be measured into a pressurized defoaming chamber and measures its concentration using (pressure).

Embodiments of the present invention will be described below with reference to the drawings. Second
The figure shows an example of a concentration meter, in which a pressurized defoaming chamber 12 is provided in contact with one side wall of a pipe 11 through which the liquid to be measured flows, and a pressurized defoaming chamber 12 is provided between the pipes 11 and the pressurized defoaming chamber 12. A liquid flow path opening 13 is formed at the portion in contact with the liquid to be measured to flow into and discharge the liquid to be measured into the pressurized defoaming chamber. This pressurized defoaming chamber 1
2 is a pressurizing pipe 1 for defoaming bubbles contained in the liquid to be measured in the pressurizing defoaming chamber 12 by injecting gas such as air or nitrogen.
4, a transmitter 15a for transmitting ultrasonic waves, and a receiver 15b for receiving the transmitted ultrasonic waves (hereinafter, 15a and 15b will be referred to as concentration measuring devices). Further, an actuator 16 is attached to the end of the pressurized defoaming chamber 12 in a liquid-tight manner, and a plunger 17 having a valve portion 17a at its tip that closes off the liquid flow path opening 13 is extendably protruded from the actuator 16. I'm letting you do it. Therefore, when the concentration meter is configured as described above, the actuator 16 is driven and the plunger 1 is
When 7 is slightly pulled, the piping 11 and the pressurized defoaming chamber 12 are connected through the liquid flow path opening 13.

By creating such a state, the dynamic pressure of the liquid to be measured automatically moves the pressure defoaming chamber 12 from the piping 11.
Since the liquid to be measured flows in, if the operation of the actuator 16 is stopped at an appropriate time, it will return to its original position due to the deenergization of the magnet or the restoring force of the spring, and the valve portion 17a of the plunger 7 will open the liquid flow path opening 13. occlude. After that, pressurize pipe 1
4 to extinguish bubbles contained in the liquid to be measured, and the concentration is measured using concentration measuring devices 15a and 15b. After measuring the concentration, pull the plunger 17 to the machine and pressurize the pipe 1.
4, the liquid to be measured in the pressurized defoaming chamber 12 is discharged, and after the discharge, the liquid to be measured in the piping 11 flows into the pressurized defoaming chamber 12 as described above. That is, the liquid to be measured is replaced within the pressurized defoaming chamber 12. In addition, in FIG. 2, the pressurizing pipe 14 is provided in the pressurizing defoaming chamber 12, but the pressurizing defoaming chamber 1
A configuration may also be adopted in which a diaphragm is provided directly on the side wall of 2, and gas is indirectly added through this diaphragm to defoam bubbles in the liquid to be measured. Next, FIG. 3 is a diagram showing another embodiment of the densitometer of the present invention.

In this concentration meter, a liquid flow path opening 1 is attached to the side wall of the pipe 11.
2 is the same in that a pressurized defoaming chamber 12 is installed which communicates directly through the pressurized defoaming chamber 12, but a column 18 is erected on the side of this pressurized defoaming chamber 12 and the actuator 16 is supported on this. At the same time, the valve plate 19 attached to the tip of the plunger 17 of the actuator 16 extends from one side of the liquid flow path opening 13 to the other side and closes it, or the valve plate 19 is pulled and the pressure is removed from the piping 11. The bubble chamber 12 is adapted to fit a lotus. 20 is a packing that makes the liquid flow path opening 13 liquid-tight, and 21 is a packing that makes the pressurized defoaming chamber 12 and the 16 actuators liquid-tight.

Further, the concentration measuring devices 15a and 15b use an ultrasonic wave transmitter/receiver, a light projector, a light receiver, or the like. The operation of the densitometer described above is almost the same as that shown in FIG.

That is, when the actuator 16 is driven to slightly pull the valve plate 19, a flow path is formed between the piping 11 and the pressurized defoaming chamber 12, and the liquid to be measured in the piping 11 is heated by the dynamic pressure of the liquid to be measured itself. The liquid to be measured naturally enters the pressurized defoaming chamber 12. When the pressurized defoaming chamber 12 is completely filled with the liquid to be measured, the valve plate 19 attached to the plunger 17 of the actuator 16 is advanced to close the liquid flow path opening 13. After that, the pressurizing pipe 14
Gas is sent to apply pressure to eliminate bubbles contained in the liquid to be measured, and then the concentration of the liquid to be measured is measured using concentration measuring devices 15a and 15b. After the concentration measurement, the valve plate 19 is similarly opened slightly to inject gas (for example, air, nitrogen, etc.) from the pressurizing pipe 14 to discharge the liquid to be measured from the pressurized defoaming chamber 12.

After discharging, when the gas injection is stopped, the liquid to be measured naturally flows into the pressurized defoaming chamber 12 due to the pressure of the liquid to be measured, so the concentration of the liquid to be measured is measured by the same operation as described above. . This concentration meter may also be provided with a diaphragm on the side wall of the pressurized defoaming chamber 12, and the diaphragm may be used to indirectly add gas to defoam the bubbles. In addition, in the above explanation, the valve body 19 is slightly opened and the liquid to be measured is pumped into the pressurized defoaming chamber 1.
2, but it goes without saying that the valve body 19 may be fully opened to allow the liquid to be measured to flow in. FIG. 4 shows another example of the concentration meter of the present invention, in which an annular operating cylinder 21 having a collar-shaped piston 21a is installed inside the pipe 11, and this operating cylinder 21
A pressurized defoaming chamber 12 and a piston drive chamber 22 are formed separately inside the piping 11 and located outside of the piping 11 .

The pressure defoaming chamber 12 is provided with a pressurizing pipe 14 for defoaming bubbles and discharging the liquid to be measured, and concentration measuring instruments 15a and 15b for measuring the concentration of the liquid to be measured. On the other hand, the piston drive chamber 22 is divided into two by the piston 21a, and each chamber is provided with air inlets 23 and 24 for driving the piston. 25 is packing.

In this concentration meter, air is introduced through the air inlet 23 to move the operating cylinder 21 to the right of the arrow in the figure.

Then, the left end of the cylinder 21 opens □ and the piping 11 and the pressurized defoaming chamber 12 communicate with each other, so that the liquid to be measured in the piping 11 automatically flows into the pressurized defoaming chamber 12 due to the dynamic pressure of the liquid. Inflow. When the pressurized defoaming chamber 12 is completely filled with the liquid to be measured, air is introduced from the air inlet 24 and the operating cylinder 21 is moved to the left in the direction of the arrow in the figure to close the pressurized defoaming chamber 12. Thereafter, gas is sent through the pressurizing pipe 14 to extinguish the bubbles, and then the concentration of the liquid to be measured is measured using the concentration measuring devices 15a and 15b. Therefore, this concentration meter can also automatically cause the liquid to be measured to flow into the pressurized defoaming chamber 12 using the dynamic pressure of the liquid to be measured. FIG. 5 is a diagram showing another example of the densitometer of the present invention.

In this example, a valve 32 having a pressurized defoaming chamber 12 with the other end closed is installed at or near the bottom of the pipe 11, and a bubbling pipe 33 is used to inflow and remove the liquid to be measured into the valve 32. This is a configuration with a The above-described concentration meter shown in FIG. 5 can also automatically cause the liquid to be measured to flow into the pressurized defoaming chamber 12 using the dynamic pressure of the liquid to be measured, similarly to those shown in FIGS. 2 to 4.

In addition, various modifications can be made to the present invention without departing from the gist thereof. For example, a slide block having two through holes approximately equal to the inner diameter of the pipes is interposed fluid-tight between two pipes through which the liquid to be measured flows, and normally one of the through holes is used to flow the liquid between the pipes and the slide block. forming a road. Therefore, when measuring the concentration of a liquid to be measured, the slide block is slid to form a flow path between the other through hole and the piping, and the one through hole is placed closely on the side of the two piping. The liquid to be measured may be stored in a pressurized defoaming chamber with a concentration measuring device, and the concentration of the liquid to be measured may be measured by defoaming under pressure in the pressurized defoaming chamber. .
As described in detail above, according to the present invention, a pressurized defoaming chamber is provided in contact with the side wall of the piping and allows the liquid to be measured to freely flow in, and a valve is provided at the boundary between the piping and the pressurized defoaming chamber. Since the structure is such that the valve body is installed, the liquid to be measured can be automatically and easily introduced into the pressurized defoaming chamber by opening part or all of the valve body in response to a valve control signal from the outside.

Therefore, unlike conventional concentration meters equipped with bypass pipes, there is no air layer created due to the time lag in the operation of both valves, and the liquid to be measured is passively pressurized and defoamed using a pump, etc. There is no need to take the action of entering the room. In other words, this densitometer can naturally introduce the liquid to be measured into the pressurized defoaming chamber by utilizing the movement of the liquid to be measured. This not only simplifies the operation, but also makes the entire densitometer compact.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a densitometer showing a conventional example, Fig. 2 is a partial sectional view showing an embodiment of the densitometer according to the present invention, and Fig. 3 is a diagram showing another embodiment of the densitometer according to the present invention. Figure A is a partially cut away vertical sectional view, Figure B is a side view of Figure A, and Figures 4 and 5 are views showing other examples of the densitometer of the present invention. 11... Piping, 12... Pressurized defoaming chamber,
13... Liquid flow path opening, 14... Pressurizing pipe, 15a, 15b... Concentration measuring device, 16
...actuator, 17...plunger, 17a...valve section, 17b...valve plate, 17c...
...Butterfly valve plate, 17d...Valve,
21... Operating cylinder, 21a... Piston, 22... Piston drive chamber. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A pressure defoaming chamber that pressurizes and extinguishes the fluid to be measured is interposed between a pipe through which the fluid to be measured flows and a pressurized defoaming chamber provided so that the fluid to be measured freely flows into the side wall of this piping. a valve body to be sealed in a bubble chamber; a pressure applying means for defoaming bubbles in the fluid to be measured sealed in the pressure defoaming chamber by the valve body; A concentration meter comprising a concentration measuring device for measuring the concentration of a fluid to be measured. 2. The valve body is adapted to expand and contract the plunger using the plunger itself of the actuator or a valve plate attached to the tip of the plunger to facilitate exchange of the fluid to be measured into the pressurized defoaming chamber. Densitometer described in section. 3. The valve body is installed so that it can move back and forth from one side of the boundary between the piping and the pressurized defoaming chamber to the other side, and by opening part or all of the valve body, it can be moved by the movement of the fluid to be measured. 2. The concentration meter according to claim 1, wherein the fluid to be measured naturally flows into the pressurized defoaming chamber. 4. The concentration meter according to claim 1, wherein the pressure applying means has both the function of defoaming bubbles in the fluid to be measured and the function of discharging the fluid to be measured from the pressurized defoaming chamber. 5. The concentration meter according to claim 1, wherein a single blind valve serving as a pressurized defoaming chamber is used as the valve body, and the fluid to be measured from the pressurized defoaming chamber is discharged by bubbling. .