JPH08334463A - Pipe inside turbidity evaluation device - Google Patents

Abstract

PURPOSE: To precisely measure the turbidity of liquid flowing inside a pipe without generating abnormal noise in the pipe. CONSTITUTION: A bypass pipe is connected to a product liquid introduction pipe 16 for cleaning liquid and a turbidimeter 23 and bypass gate valves 21, 22 are arranged in series in this bypass pipe. A main gate valve 19 is arranged in a part bypassed by the bypass pipe in the product liquid introduction pipe so that the turbidity of the cleaning liquid, which is in a stable state after the bypass gate valve is opened and closed, is measured by the turbidimeter 23 and it is so controlled that at least one of the main gate valve 19 and the bypass gate valves 21, 22 is always in an opened state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-pipe turbidity evaluation device for detecting the turbidity of a fluid flowing in a pipe.

[0002]

2. Description of the Related Art There has been a conventional technique for optically measuring the turbidity of a fluid flowing in a pipe. For example, in the invention described in Japanese Patent Publication No. 63-66236, the change in the turbidity of a cleaning liquid is optically measured by a turbidimeter. A washing machine has been proposed in which the washing or rinsing operation is controlled by performing a specific measurement.

[0003]

However, in the above-mentioned conventional example, since the turbidimeter measures the turbidity of the washing liquid in a flowing state, air bubbles exist in the washing liquid to be detected, and the bubbles are present. Due to the above, the turbidimeter may measure that the turbidity of the cleaning liquid is low.

The present invention has been made in view of the above circumstances, and provides an in-pipe turbidity evaluation device capable of accurately measuring the turbidity of a fluid flowing in a pipe without generating abnormal noise in the pipe. The purpose is to provide.

[0005]

According to a first aspect of the present invention, a bypass pipe is connected to a main pipe through which a fluid flows, and a turbidimeter and a bypass sluice valve are arranged in series in the bypass pipe. A main sluice valve is arranged in a portion bypassed by the bypass pipe, and the turbidity of the fluid in a stationary state after the bypass sluice valve is opened and closed is measured by the turbidimeter and At least one of the main sluice valve and the bypass sluice valve is always controlled to be in an open state.

According to a second aspect of the present invention, in the first aspect of the invention, a cleaning fluid is constantly sprayed onto the measurement surface of the turbidimeter so that the measurement surface is kept in a clean state. It is the one.

[0007]

The invention described in claim 1 has the following effects.
The bypass sluice valve is opened to guide the fluid in the main pipe into the bypass pipe, and then the bypass sluice valve is closed to make the fluid in the bypass pipe stand still. Since the turbidity meter measures the turbidity, no bubbles are present in the stationary fluid, and therefore the turbidity meter can accurately measure and evaluate the turbidity of the fluid without being affected by the bubbles.

Further, if the bypass sluice valve and the main sluice valve are closed at the same time for a certain period of time, the internal pressure of the main pipe and the bypass pipe rises, and abnormal noise may occur in the main pipe due to the water hammer phenomenon. There is In the present invention, at least one of the bypass sluice valve and the main sluice valve is controlled so that at least one of them is always in the open state, so that the internal pressure of the main pipe does not rise, and therefore the generation of abnormal noise can be prevented.

The invention according to claim 2 has the following effects. Since the cleaning fluid is constantly sprayed on the measurement surface of the turbidimeter to keep the measurement surface in a clean state, the measurement accuracy of the turbidimeter can be further improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a pipeline diagram showing a strainer cleaning device to which an embodiment of the pipe turbidity evaluation device according to the present invention is applied. FIG. 2 is a schematic sectional view taken along the line II-II in FIG. FIG. 3 is a partial side view showing a part of the strainer cleaning device of FIG. 1 in a broken state. FIG. 4 is a flowchart showing the operation of the strainer cleaning device of FIG. Figure 5
(A) is a plan view showing the turbidimeter of FIG.
FIG. 5B is a VB arrow view of FIG. FIG. 6 is a time chart showing a control pattern of the gate valve of FIG. FIG. 7 is a table showing the characteristic values of the cleaning liquid obtained by cleaning each product liquid introduced to the strainer. FIG. 8 is a graph showing the relationship between the transmitted light output voltage of the turbidimeter and the TOD value for the liquid type I. FIG. 9 is a graph showing the relationship between the transmitted light output voltage of the turbidimeter and the TOD value regarding the liquid type E.

A strainer 10 to be cleaned by the strainer cleaning device 1 shown in FIG. 1 includes a cylindrical side cylinder portion 11 having a top surface portion 12 and a bottom surface portion 13, and these side cylinder portions 11,
A net-shaped filter 14 is housed inside the top surface portion 12 and the bottom surface portion 13. The product liquid introduction pipe 16 is connected to the central portion of the bottom surface portion 13, and the product liquid discharge pipe 17 is connected to the upper portion of the side tubular portion 11. Strainer 10
Guides the product liquid from the product liquid introduction pipe 16, removes impurities in the product liquid with the filter 14, and removes the impurities from the product liquid through the product liquid discharge pipe 17 to another system, for example, a product liquid filling machine. Supply to.

The strainer 10 is connected to the product liquid introducing pipe 16.
The introduction valve 18 is provided on the side closer to the main sluice, and the main sluice valve 19 is provided on the distant side. A bypass pipe 20 is connected to bypass the main sluice valve 19. This bypass piping 20
A turbidimeter 23, which will be described later, is provided in the bypass pipe 2
The first bypass sluice valve 2 on both sides of this turbidity meter 23
The first and second bypass sluice valves 22 are arranged in series with the turbidity meter 23. On the other hand, a discharge valve 24 is arranged in the product liquid discharge pipe 17. By opening and closing the introduction valve 18, the strainer 1
The introduction of the product liquid to 0 is controlled, and the opening and closing of the outlet valve 24 controls the supply of the product liquid from the strainer 10.

The strainer 10 is further connected with a product outlet cleaning medium introducing pipe 25, an upper cleaning medium outlet pipe 26 and an upper cleaning medium introducing pipe 27, and further with a side cleaning medium introducing pipe 28. A cleaning medium (hot water, cold water), a cleaning medium such as steam or compressed air is supplied into the strainer 10 from the product outlet cleaning medium introducing pipe 25, the upper cleaning medium introducing pipe 27, and the side cleaning medium introducing pipe 28. As described above, the inside of the strainer 10 is washed.

In the product liquid outlet pipe 17, the product outlet cleaning medium inlet pipe 25 is installed in the strainer 1 rather than the outlet valve 24.
It is connected to the 0 side and includes a first upper valve 31. The upper cleaning medium outlet pipe 26 and the upper cleaning medium inlet pipe 27 are connected to the top surface portion 12 of the strainer 10, and the second upper valve 32 is connected to the upper cleaning medium outlet pipe 26 and the upper cleaning medium inlet pipe 2
A third upper valve 33 is arranged at 7.

The side cleaning medium introduction pipe 28 is shown in FIG.
As shown in, a plurality of, for example, eight, are connected to the lower portion of the side tubular portion 11 of the strainer 10. A side valve 34 is provided in each side cleaning medium introduction pipe 28.

The tip of each side cleaning medium introducing pipe 28 is
The nozzle is installed. As shown in FIG. 3, the tip of the side washing medium introduction pipe 28 is set at an angle θ (for example, θ = 45 °) with respect to the vertical line so that the washing liquid (warm water) can be well stirred during bubble washing described later. And The bottom surface portion 13 of the strainer 10 is formed in a tapered shape so that the central portion to which the product liquid introduction pipe 16 is connected is the lowest and the outer peripheral portion is the highest.

When changing the type of the product liquid introduced into the strainer 10 from the product liquid introduction pipe 16 shown in FIG. 1, control of the introduction valve 18 and the discharge valve 24, and the first upper valve 3
By controlling the first, second upper valve 32, third upper valve 33, and side valve 34, the product outlet cleaning medium introducing pipe 25, the upper cleaning medium introducing pipe 27, and the side cleaning medium introducing pipe 28 to the inside of the strainer 10. A cleaning medium is introduced into the strainer 10, and product liquid disposal, hot water storage, bubble cleaning, and bubble disposal can be sequentially performed in the strainer 10 by changing the hot water storage amount.

That is, as shown in FIG. 4, the strainer 1
At the time of cleaning of 0, first, the outlet valve 24 is closed, the first upper valve 31 is opened, and the compressed air is transferred from the product outlet cleaning medium introduction pipe 25 through the product liquid outlet pipe 17 to the strainer 10
The product liquid in the strainer 10 is discharged into the product liquid introduction pipe 16 and discarded. At this time, the side valve 34
May be opened, compressed air may be supplied into the strainer 10 from the side cleaning medium introduction pipe 28, and the product liquid in the strainer 10 may be discarded more quickly.

Next, the introduction valve 18 and the first upper valve 31 are closed, the second upper valve 32, the third upper valve 33 and the side valve 34 are opened, and the upper cleaning medium introduction pipe 27 and the side portion are opened. Hot water is supplied into the strainer 10 from the cleaning medium introduction pipe 28. The liquid surface H of this warm water is about 80 degrees from the bottom surface portion 13 of the strainer 10.
When the water reaches up to mm, the supply of hot water is stopped (warm water pool). After that, the side valve 34 is opened to mix compressed air into the warm water stored from the side cleaning medium introduction pipe 28,
A turbulent flow is generated in this warm water to bubble-clean the bottom of the strainer 10 for about 10 seconds. At this time, the valve 32 is opened.

After the bubble cleaning, the introducing valve 18 and the third upper valve 33 are opened, compressed air is supplied into the strainer 10 from the upper cleaning medium introducing pipe 27 and the side cleaning medium introducing pipe 28, and after the cleaning. The hot water of (1) is discarded from the strainer 10 through the product liquid introducing pipe 16 (bubble disposal). The above warm water reservoir, bubble washing and bubble discarding are repeated twice. At this time, the valve 32 is opened.

Next, the introduction valve 18 and the first upper valve 31 are closed, the second upper valve 32, the third upper valve 33, and the side valve 34 are opened, and the upper cleaning medium introduction pipe 27, side Hot water is stored from the partial cleaning medium introduction pipe 28 to the top surface portion 12 of the strainer 10. Desirably, warm water is stored up to the position of the second upper valve 32 (warm water reservoir). Then, the second upper valve 32, the third
The upper valve 33 and the side valve 34 are opened, and compressed air is supplied from the upper cleaning medium introducing pipe 27 and the side cleaning medium introducing pipe 28 to generate a turbulent flow in the warm water stored in the strainer 10. Bubble wash the entire strainer 10 for about 60 seconds.

After the bubble cleaning, the introducing valve 18 and the third upper valve 33 are opened, compressed air is supplied from the third upper cleaning medium introducing pipe 27 and the side cleaning medium introducing pipe 28, and hot water after washing is supplied. Is discharged from the strainer 10 through the product liquid introduction pipe 16 and discarded (bubble discard). At the time of discarding the bubbles, impurities once peeled off from the strainer 10 may adhere to the strainer 10 again, so the top surface portion 1
Repeat warm water reservoir up to 2 and bubble washing and bubble discarding twice.

After that, the hot water flowing through the product liquid introducing pipe 16 is guided to the bypass pipe 20 by the control in which the main sluice valve 19 and the first bypass sluice valve 21 and the second bypass sluice valve 22 are not closed at the same time. Set it to a stationary state,
The turbidity meter 23 detects the turbidity of the hot water in the stationary state.
If the turbidity is not less than the predetermined value, when the warm water discharged up to the top surface portion 12, bubble cleaning and bubble discarding are repeated until the hot water discharged through the product liquid introducing pipe 16 becomes less than the predetermined turbidity. The cleaning of the strainer 10 is completed.

By the way, the turbidity meter 23, the main sluice valve 19, the first bypass sluice valve 21 and the second bypass sluice valve 22 shown in FIG. 1, the dustproof cover 43 and the air supply nozzle 44 shown in FIG. The internal turbidity evaluation device 39 is configured.

First, the turbidity meter 23, as shown in FIG.
It is configured to include a light projecting light sensor 40 and a light receiving photosensor 41. The light projecting light sensor 40 and the light receiving photosensor 41 are horizontally installed on both sides of a sight glass 42 made of a transparent material provided in the bypass pipe 20. The light projecting light sensor 40 emits a single laser beam having a wavelength of 780 nm. The light receiving optical sensor 41 is
The product liquid introduction pipe 1 projected from the light projecting light sensor 40.
The laser light that has passed through the cleaning liquid (for example, warm water) flowing inside 6 is received.

Generally, in the cleaning liquid, the impurity concentration Y
The higher the (ppm), the higher the total oxygen demand (TOD) value X (ppm) in the cleaning solution. When the TOD value X in the cleaning liquid increases, the amount of laser light transmitted through the cleaning liquid decreases, and the transmitted light output voltage value Z (V) in the light receiving optical sensor 41 of the turbidity meter 23 decreases. Shows a negative correlation.

For example, in the case of the red product liquid (liquid type I) shown in FIG. 7, it is between the transmitted light output voltage value Z of the turbidimeter 23 and the TOD value X of the cleaning liquid that has washed this product liquid. Then, under the correlation coefficient of −0.99, there is a relationship of Z = −2.98 × 10 ⁻³ X−4.82 ... (FIG. 8), and the transmitted light output voltage value Z of the turbidimeter 23 and the TOD value of the cleaning liquid It can be seen that there is a negative correlation between. Further, in the case of the blue-based product liquid (liquid type E) shown in FIG. 7, there is a phase difference between the transmitted light output voltage Z of the turbidimeter 23 and the TOD value X of the cleaning liquid that has cleaned this product liquid. Number of relationships −
Under 0.99, there is a relation of Z = −5.48 × 10 ⁻¹⁰ X ³ + 8.59 × 10 ⁻⁷ X ² −5.21 × 10 ⁻⁴ X + 4.93… (Fig. 9), and in this case also, turbidity It can be seen that there is a negative correlation between the transmitted light output voltage value Z of the total 23 and the TOD value X of the cleaning liquid. In addition, for all 11 product liquids shown in FIG. 7, between the transmitted light output voltage value Z of the turbidimeter 23 and the TOD value X of the cleaning liquid after cleaning each product liquid, a correlation coefficient of −0.9 or more is obtained. There is a negative correlation.

Here, T of the cleaning liquid detected by the turbidimeter 23
If the OD value X is 200 ppm or less in consideration of the safety factor, it can be determined that the various pipes including the product liquid introduction pipe 16 and the strainer 10 have been sufficiently washed. Turbidity meter 23
Evaluates the turbidity of the cleaning liquid until the transmitted light output voltage value Z measured by the turbidity meter 23 reaches a value corresponding to 200 ppm of the TOD value X of the cleaning liquid. Fig. 7 shows the TOD value X of the cleaning liquid obtained by cleaning each product liquid for each product type 2
The value of the transmitted light output voltage Z of the turbidimeter 23 corresponding to 00 ppm is shown.

As can be seen from FIGS. 8 and 9, the absolute value of the slope (ΔZ / ΔX) of the straight line of the formula for the blue product liquid is (ΔZ /
Smaller than the absolute value of ΔX). Therefore, in the turbidity meter 23, when the product liquid type is bluish rather than reddish, the resolution of the turbidity meter 23 tends to decrease. . However, in reality, for the liquid type E whose product liquid is blue, the transmitted light output voltage value Z of the turbidimeter 23 is 4.852 V (200
When this cleaning solution is sampled and the TOD value X of this cleaning solution is measured, it is 198 pp
Since m is m, it can be seen that the turbidity meter 23 has a small measurement error even for a blue-based product liquid whose resolution is lowered.
Therefore, since the turbidity meter 23 is accurate in measuring even the blue-based product liquid having the largest measurement error, the product liquids of all spectra from blue to red are washed. The turbidity of the cleaning solution can be accurately evaluated.

Next, as shown in FIG. 5, the light projecting optical sensor 40 and the light receiving optical sensor 41 of the turbidity meter 23 are surrounded by a dustproof cover 43 and the dustproof cover 43.
An air supply nozzle 44 is provided in the. The opening of the air supply nozzle 44 is near the measurement surface 45 of the light projecting light sensor 40 and the light receiving photosensor 41, and the air supply nozzle 44
From this to the measurement surface 45, air as a cleaning fluid is sprayed at appropriate times, and this measurement surface is kept in a clean state.

Further, the main sluice valve 19 shown in FIG.
The bypass sluice valve 21 and the second bypass sluice valve 22 are shown in FIG.
As shown in FIG. 3, the first bypass sluice valve 21 and the second bypass sluice valve 22 are opened and then closed to introduce the cleaning liquid (hot water) in the product liquid introduction pipe 16 into the bypass pipe 20. The turbidity meter 23 evaluates the turbidity of the stationary cleaning liquid, and at least one of the main sluice valve 19, the first bypass sluice valve 21, and the second bypass sluice valve 22 is The valve is always controlled to be open.

That is, as shown in FIG. 6, the main sluice valve 19, the first bypass sluice valve 21 and the second bypass sluice valve 22 are all opened before the turbidity meter 23 evaluates the turbidity. Then, 2 seconds after the main sluice valve 19 is opened, the main sluice valve 19 is closed to positively introduce the cleaning liquid from the product liquid introduction pipe 16 into the bypass pipe 20.

Next, from the opening of the second bypass gate valve 22
After the lapse of 5 seconds, the second bypass sluice valve 22 is closed, and at the same time, the main sluice valve 19 is opened. By closing the second bypass gate valve 22, the cleaning liquid flowing in the bypass pipe 20 is blocked. Two seconds after the simultaneous operation of closing the second bypass sluice valve 22 and opening the main sluice valve 19, the first bypass sluice valve 21 is closed to stop the flow of the cleaning liquid in the bypass pipe 20. Let it stand still.

After waiting for 3 seconds from the closing of the first bypass sluice valve 21, the turbidity meter 23 measures the turbidity of the stationary wash water. The waiting time of 3 seconds is a time for the bubbles in the cleaning liquid in the bypass pipe 20 to disappear, and varies depending on the viscosity of the cleaning liquid, and is set for each product liquid.

The main gate valve 19, the first bypass gate valve 21, the second bypass gate valve 22 and the turbidity meter 23 described above.
The operation control is continuously performed, and the strainer 10 and the piping system are cleaned until the TOD value X of the cleaning liquid is evaluated to be 200 ppm or less from the measurement value of the turbidity meter 23.

When the TOD value X of the cleaning liquid is 200 ppm or less when the measured value of the turbidimeter 23 is continuously measured, the strainer 10 and the piping system are cleaned at the time when the measured value is based on the transmitted light output voltage value Z. Judge that it is finished. Further, this method stabilizes the reliability of the turbidity evaluation by the turbidimeter 23.

According to the in-pipe turbidity evaluation device 39, the following actions and effects are obtained. First bypass gate valve 21 and second
The bypass sluice valve 22 is opened to introduce the cleaning liquid in the product liquid introduction pipe 16 into the bypass pipe 20, and then the first bypass sluice valve 21 and the second bypass sluice valve 22 are closed to bypass the bypass pipe 20. Since the washing liquid inside is made stationary and the turbidity meter 23 measures the turbidity of the washing liquid in this stationary state, there are no bubbles in the washing liquid in the stationary state. The turbidity of the cleaning solution can be accurately measured and evaluated without being affected.

In the valve control shown in FIG. 6, when the first bypass sluice valve 21, the second bypass sluice valve 22 and the main sluice valve 19 are closed at the same time for a certain period of time,
The internal pressures of the product liquid introducing pipe 16 and the bypass pipe 20 rise, and abnormal noise is generated in the product liquid introducing pipe 16 due to the water hammer phenomenon. In this embodiment, the first bypass sluice valve 21, the second bypass sluice valve 22 and the main sluice valve 1
No. 9 is controlled so that at least one of them is always opened, so that the internal pressure of the product liquid introducing pipe 16 does not rise, so that the abnormal noise can be prevented from occurring in the product liquid introducing pipe.

Further, air is constantly blown from the air supply nozzle 44 onto the measurement surfaces 45 of the light projecting light sensor 40 and the light receiving light sensor 41 in the turbidity meter 23, and the measurement surface 4
Since 5 is kept in a clean state, the measurement accuracy of the turbidity meter 23 can be made more accurate.

The air supply nozzle 44 is used as the light projecting sensor 4
Although the case where the air is blown onto the measurement surface 45 of the 0 and the light receiving sensor 41 is described, a gas other than the air may be blown.

[0041]

As described above, according to the in-pipe turbidity evaluation apparatus of the present invention, there is no abnormal noise in the pipe,
The turbidity of the fluid flowing in the pipe can be measured accurately.

[Brief description of drawings]

FIG. 1 is a pipeline diagram showing a strainer cleaning device to which an embodiment of an in-pipe turbidity evaluation device according to the present invention is applied.

FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG.

FIG. 3 is a partial side view showing a part of the strainer cleaning device of FIG. 1 in a broken state.

FIG. 4 is a flowchart showing the operation of the strainer cleaning device of FIG.

5 (A) is a plan view showing the turbidimeter of FIG. 1, and FIG. 5 (B) is a VB arrow view of FIG. 5 (A).

6 is a time chart showing a control pattern of the gate valve of FIG.

FIG. 7 is a chart showing characteristic values of a cleaning liquid obtained by cleaning each product liquid introduced to a strainer.

FIG. 8 is a graph showing the relationship between the transmitted light output voltage of the turbidimeter and the TOD value for liquid type I.

FIG. 9 is a graph showing the relationship between the transmitted light output voltage of a turbidimeter and the TOD value for liquid type E.

[Explanation of symbols]

 16 Product Liquid Introducing Pipe 19 Main Gate Valve 20 Bypass Pipe 21 First Bypass Gate Valve 22 Second Bypass Gate Valve 23 Turbidimeter 40 Optical Sensor for Projecting Light 41 Optical Sensor for Receiving 43 Dust Cover 44 Air Supply Nozzle 45 Measuring Surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeru Hatanaka 2-1-3 Bunka, Sumida-ku, Tokyo Kao Corporation Stock Research Institute

Claims (2)

[Claims] 1. A bypass pipe is connected to a main pipe through which a fluid flows, and a turbidity meter and a bypass sluice valve are arranged in series in the bypass pipe, and a main sluice valve is provided in a portion of the main pipe bypassed by the bypass pipe. Is placed,
Measure the turbidity of the fluid in a stationary state after opening and closing the bypass sluice valve with the turbidity meter, and at least one of the main sluice valve and the bypass sluice valve is always controlled to be in the open state. An apparatus for evaluating turbidity in a pipe, which is characterized in that: 2. The in-pipe turbidity evaluation device according to claim 1, wherein the measuring surface of the turbidimeter is constantly sprayed with a cleaning fluid to keep the measuring surface in a clean state.