JP3211196B2 - Pipe turbidity evaluation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, there has been a method 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, a change in turbidity of a cleaning liquid is optically measured by a turbidimeter. A washing machine has been proposed which measures the washing or rinsing operation by measuring the temperature.

[0003]

However, in the above-mentioned conventional example, since the turbidity meter measures the turbidity of the cleaning liquid in a flowing state, bubbles are present in the cleaning liquid to be detected, and these bubbles are present. The turbidity meter may measure that the turbidity of the washing liquid is low due to the influence of the above.

The present invention has been made in view of the above-described circumstances, and provides a 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 the first aspect of the present invention, both ends of a bypass pipe are connected to a main pipe through which a fluid flows, and the turbidity meter and both sides of the turbidity meter are connected to the bypass pipe. Located during turbidity measurement to keep the fluid stationary
First and second bypass gate valves that close are arranged in series,
Close the part of the main pipe bypassed by the bypass pipe to guide fluid to the bypass pipe before measuring turbidity.
The main gate valve is located on the outside of the measuring surface of the turbidimeter
A gas supply nozzle that constantly blows gas as a cleaning fluid
It has a chirping .

[0006]

[0007]

The invention described in claim 1 has the following operation.
The first and second bypass gate valves are opened to guide the fluid in the main pipe into the bypass pipe, and then the first and second bypass gate valves are opened .
Turbidity in the bypass piping by closing the bypass gate valve
Both sides of the meter are completely closed, the fluid around the turbidity meter is completely stopped, and the turbidity meter measures the turbidity of the fluid in the still state. Has no air bubbles,
Therefore, the turbidity meter can accurately measure and evaluate the turbidity of the fluid without being affected by bubbles.

When both the first and second bypass gate valves and the main gate valve are closed at the same time and a certain period of time has passed, the internal pressures of the main pipe and the bypass pipe increase, and the main pipe is affected by a water hammer phenomenon. There is a possibility that sound is generated. In the present invention, since at least one of the first and second bypass gate valves and the main gate valve is controlled to always be in the open state, the internal pressure of the main pipe does not increase, and therefore, generation of abnormal noise can be prevented. .

[0009] Turbidimeter measurement surfaceOutsideCleaning fluid
When sprayed, this measurement surfaceOutsideKept clean
Therefore, the measurement accuracy of the turbidity meter 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 a pipe turbidity evaluation device according to the present invention is applied. FIG. 2 is a schematic sectional view taken along the line II-II of FIG. FIG. 3 is a partial side view showing a part of the strainer cleaning apparatus of FIG. 1 in a broken state. FIG. 4 is a flowchart showing the operation of the strainer cleaning device of FIG. FIG.
FIG. 5A is a plan view showing the turbidimeter of FIG.
(B) is a view on arrow VB in FIG. 5 (A). FIG. 6 is a time chart showing a control pattern of the gate valve of FIG. FIG. 7 is a chart showing characteristic values of the cleaning liquid obtained by cleaning each product liquid guided 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 liquid type I. FIG. 9 is a graph showing the relationship between the transmitted light output voltage of the turbidimeter and the TOD value for liquid type E.

A strainer 10 to be cleaned by the strainer cleaning apparatus 1 shown in FIG. 1 includes a cylindrical side tube portion 11 having a top surface portion 12 and a bottom surface portion 13.
A net-shaped filter 14 is housed inside the top surface portion 12 and the bottom surface portion 13. A product liquid introduction pipe 16 is connected to the center of the bottom part 13, while a product liquid lead pipe 17 is connected to the upper part of the side tube part 11. Strainer 10
Introduces the product liquid from the product liquid introduction pipe 16, removes impurities in the product liquid by the filter 14, and supplies the product liquid from which the impurities have been removed to another system such as a product liquid filling machine through the product liquid outlet pipe 17. Supply to

The product liquid introduction pipe 16 has a strainer 10
An introduction valve 18 is provided on the side closer to and a main gate valve 19 is provided on the far side, and a bypass pipe 20 is connected to bypass the main gate valve 19. This bypass pipe 20
In addition, a turbidity meter 23 described later is provided, and
0, the first bypass gate valve 2 is provided on both sides of the turbidity meter 23.
First and second bypass gate valves 22 are arranged in series with the turbidimeter 23. On the other hand, the product liquid outlet pipe 17 is provided with an outlet valve 24. The strainer 1 is opened and closed by opening and closing the introduction valve 18.
The supply of the product liquid from the strainer 10 is controlled by controlling the introduction of the product liquid to zero and opening and closing the outlet valve 24.

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

The cleaning medium introduction pipe 25 for the product outlet is connected to the strainer 1 more in the product liquid outlet pipe 17 than the outlet valve 24.
The first upper valve 31 is connected to the 0 side. 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 upper cleaning medium outlet pipe 26 has a second upper valve 32 and the upper cleaning medium inlet pipe 2.
7 is provided with a third upper valve 33.

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

The tip of each side cleaning medium introduction pipe 28 is
Nozzle is installed. As shown in FIG. 3, the tip of the side cleaning medium introduction pipe 28 is set at an angle θ (eg, θ = 45 °) with respect to a vertical line, so that the cleaning liquid (hot water) is well stirred during bubble cleaning described later. And The bottom 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 from the product liquid introduction pipe 16 to the strainer 10 shown in FIG. 1, the 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 introduction pipe 25, upper cleaning medium introduction pipe 27, and side cleaning medium introduction pipe 28 A cleaning medium is introduced into the strainer 10, and in this strainer 10, product liquid disposal, hot water storage, bubble cleaning and bubble disposal can be sequentially performed by changing the amount of hot water storage.

That is, as shown in FIG.
At the time of cleaning, the outlet valve 24 is first closed, the first upper valve 31 is opened, and compressed air is supplied 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 to the product liquid introduction pipe 16 and discarded. At this time, the side valve 34
May be opened, compressed air may be supplied from the side cleaning medium introduction pipe 28 into the strainer 10, 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. Hot water is supplied from the cleaning medium introduction pipe 28 into the strainer 10. The level H of the warm water is approximately 80 ° from the bottom surface 13 of the strainer 10.
When the water accumulates to the nearest mm, stop supplying hot water (hot water reservoir). Thereafter, the side valve 34 is opened, and the compressed air is mixed into the warm water stored from the side cleaning medium introduction pipe 28,
A turbulent flow is generated in the warm water to bubble-wash the bottom of the strainer 10 for about 10 seconds. At this time, the valve 32 is opened.

After the bubble cleaning, the introduction valve 18 and the third upper valve 33 are opened, and 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, Is discarded from the strainer 10 through the product liquid introduction pipe 16 (bubble disposal). The above hot water reservoir, bubble washing and bubble disposal 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, Hot water is stored from the part cleaning medium introduction pipe 28 to the top surface part 12 of the strainer 10. Desirably, hot water is stored up to the position of the second upper valve 32 (hot water storage). 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 introduction pipe 27 and the side cleaning medium introduction pipe 28 to generate turbulent flow in the warm water stored in the strainer 10. Then, the entire strainer 10 is bubble-cleaned for about 60 seconds.

After the bubble cleaning, the introduction valve 18 and the third upper valve 33 are opened, and compressed air is supplied from the third upper cleaning medium introduction pipe 27 and the side cleaning medium introduction pipe 28, and the hot water after the cleaning is supplied. Is discharged from the strainer 10 via the product liquid introduction pipe 16 and discarded (bubble disposal). When the bubble is discarded, impurities that have been peeled off once from the strainer 10 may adhere to the strainer 10 again.
Repeat hot water reservoir, bubble washing and bubble disposal up to 2 times.

Thereafter, the hot water flowing through the product liquid introduction pipe 16 is guided to the bypass pipe 20 by a control in which the main gate valve 19, the first bypass gate valve 21 and the second bypass gate valve 22 are not simultaneously closed. Make it stationary,
The turbidity of the hot water in the stationary state is detected by the turbidimeter 23.
If the turbidity is not less than the predetermined value, the hot water storage up to the top surface portion 12, the bubble washing and the bubble disposal are repeated, and the hot water discharged from the product liquid introduction pipe 16 becomes the predetermined turbidity or less. Then, the cleaning of the strainer 10 is completed.

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

First, the turbidimeter 23 is, as shown in FIG.
It is configured to include a light emitting light sensor 40 and a light receiving light sensor 41. The light-emitting light sensor 40 and the light-receiving light sensor 41 are horizontally installed on both sides of a transparent sight glass 42 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 projection optical sensor 40
The laser beam transmitted through the cleaning liquid (for example, warm water) flowing through the inside 6 is received.

Generally, in the cleaning liquid, the impurity concentration Y
(Ppm) increases, the total oxygen demand (TOD) value X (ppm) in the cleaning solution increases. When the TOD value X in the cleaning liquid increases, the transmission amount of the 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 turbidimeter 23 decreases. Indicates a negative correlation.

For example, in the case of a red product liquid (liquid type I) shown in FIG. 7, the transmission light output voltage value Z of the turbidimeter 23 and the TOD value X of the cleaning liquid that has washed this product liquid. Under the correlation coefficient −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 a blue product liquid (liquid type E) shown in FIG. 7, the phase difference between the transmitted light output voltage Z of the turbidimeter 23 and the TOD value X of the cleaning liquid that has washed this product liquid. Relation number-
Under 0.99, there is a relationship of Z = −5.48 × 10 ⁻¹⁰ X ³ + 8.59 × 10 ⁻⁷ X ² −5.21 × 10 ⁻⁴ X + 4.93 (FIG. 9). 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 types of product liquids shown in FIG. 7, the correlation coefficient between the transmitted light output voltage value Z of the turbidimeter 23 and the TOD value X of the cleaning liquid obtained by cleaning each product liquid is −0.9 or more. There is a negative correlation.

Here, the T of the washing liquid detected by the turbidimeter 23 is
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. Turbidimeter 23
Evaluates the turbidity of the cleaning liquid until the transmitted light output voltage value Z measured by the turbidimeter 23 becomes a value corresponding to 200 ppm of the TOD value X of the cleaning liquid. FIG. 7 shows, for each product liquid type, the TOD value X of the cleaning liquid obtained by cleaning each product liquid.
The value of the transmitted light output voltage Z of the turbidimeter 23 corresponding to 00 ppm is shown.

As is clear from FIGS. 8 and 9, the absolute value of the gradient (ΔZ / ΔX) of the straight line of the formula in the blue product liquid is expressed by (ΔZ / ΔZ) of the straight line in the red product liquid.
ΔX) is smaller than the absolute value of the turbidimeter 23. Therefore, in the turbidimeter 23, the resolution of the turbidimeter 23 tends to decrease when the product liquid type is blue based rather than red. . However, in practice, the transmitted light output voltage Z of the turbidimeter 23 is 4.852 V (200
(switching value below ppm), this cleaning liquid is sampled, and the TOD value X of this cleaning liquid is measured to be 198 pp
m, which indicates that the turbidity meter 23 has a small measurement error even for a blue product liquid having a reduced resolution.
Therefore, since the turbidity meter 23 can accurately measure even the bluish product liquid having the largest measurement error, the turbidity meter 23 washes those product liquids with respect to the product liquids of all the spectra from blue to red. The turbidity of the washing solution can be accurately evaluated.

Next, as shown in FIG. 5, the light transmitting optical sensor 40 and the light receiving optical sensor 41 of the turbidimeter 23 are surrounded by a dustproof cover 43 and
Is provided with an air supply nozzle 44. The opening of the air supply nozzle 44 is located near the measurement surface 45 of the light emitting light sensor 40 and the light receiving light sensor 41.
The air as a cleaning fluid is blown to the measurement surface 45 from time to time to keep the measurement surface in a clean state.

The main gate valve 19 shown in FIG.
The bypass gate valve 21 and the second bypass gate valve 22 are shown in FIG.
The first bypass gate valve 21 and the second bypass gate valve 22 are opened and then closed, and the cleaning liquid (hot water) in the product liquid introduction pipe 16 is guided into the bypass pipe 20. And the turbidity meter 23 evaluates the turbidity of the cleaning liquid in the stationary state, and at least one of the main gate valve 19, the first bypass gate valve 21, and the second bypass gate valve 22 is provided. Control is performed so that the valve is always opened.

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

Next, from the opening of the second bypass gate valve 22,
After a lapse of 5 seconds, the second bypass gate valve 22 is closed, and at the same time, the main gate 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 gate valve 22 and opening the main gate valve 19, the first bypass gate valve 21 is closed to stop the flow of the cleaning liquid in the bypass pipe 20. And let it stand still.

After a lapse of 3 seconds from the closing of the first bypass gate valve 21, the turbidity of the stationary washing water is measured by the turbidimeter 23. The 3-second waiting time is a time for eliminating bubbles in the cleaning liquid in the bypass pipe 20, and is set for each product liquid because it differs depending on the viscosity of the cleaning liquid.

The main gate valve 19, the first bypass gate valve 21, the second bypass gate valve 22, and the turbidity meter 23 are described above.
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 based on the measured value of the turbidity meter 23.

When the measured value of the turbidity meter 23 is measured twice consecutively and the TOD value X of the cleaning liquid is 200 ppm or less based on the transmitted light output voltage value Z, cleaning of the strainer 10 and the piping system is started. It is determined that the process has been completed. This method also stabilizes the reliability of the turbidity evaluation by the turbidimeter 23.

According to the pipe turbidity evaluation device 39, the following operations and effects are obtained. First bypass gate valve 21 and second bypass valve
The bypass gate valve 22 is opened to guide the cleaning liquid in the product liquid introduction pipe 16 into the bypass pipe 20. Next, the first bypass gate valve 21 and the second bypass gate valve 22 are closed, and the bypass pipe 20 is closed. The cleaning liquid in the stationary state is set to a stationary state, and the turbidity meter 23 measures the turbidity of the cleaning liquid in the stationary state. Therefore, the cleaning liquid in the stationary state has no air bubbles. Without being affected, the turbidity of the washing solution can be accurately measured and evaluated.

In the valve control shown in FIG. 6, if the first bypass gate valve 21, the second bypass gate valve 22, and the main gate valve 19 are closed at the same time and a certain time has elapsed,
The internal pressure of the product liquid introduction pipe 16 and the bypass pipe 20 increases, and the product liquid introduction pipe 16 generates abnormal noise due to the water hammer phenomenon. In this embodiment, the first bypass gate valve 21, the second bypass gate valve 22, and the main gate valve 1
9 is controlled so that at least one of them is always in the valve open state, so that the internal pressure of the product liquid introduction pipe 16 does not increase, and therefore, the generation of the abnormal noise in the product liquid introduction pipe can be prevented.

Further, air is constantly blown from the air supply nozzle 44 to the measurement surface 45 of the light emitting light sensor 40 and the light receiving light sensor 41 of the turbidity meter 23.
Since the sample 5 is kept in a clean state, the measurement accuracy of the turbidimeter 23 can be further improved.

The air supply nozzle 44 is connected to the light emitting sensor 4.
Although a case where air is blown to the measurement surface 45 of the light-receiving sensor 41 and 0 is described, a gas other than air may be blown.

[0041]

As described above, according to the apparatus for evaluating turbidity in a pipe according to the present invention, no abnormal noise is generated in the pipe.
The turbidity of the fluid flowing in the pipe can be accurately measured.

[Brief description of the drawings]

FIG. 1 is a pipeline diagram showing a strainer cleaning device to which an embodiment of a 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 apparatus of FIG. 1 in a broken state.

FIG. 4 is a flowchart showing the operation of the strainer cleaning device of FIG. 1;

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

FIG. 6 is a time chart showing a control pattern of the gate valve of FIG. 1;

FIG. 7 is a chart showing characteristic values of a cleaning liquid obtained by cleaning each product liquid guided 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 the turbidimeter and the TOD value for liquid type E.

[Explanation of symbols]

 16 Product liquid introduction pipe 19 Main gate valve 20 Bypass pipe 21 First bypass gate valve 22 Second bypass gate valve 23 Turbidity meter 40 Light emitting light sensor 41 Light receiving light sensor 43 Dustproof cover 44 Air supply nozzle 45 Measurement surface

Continuation of front page (72) Inventor Shigenori Hatanaka 2-1-3 Bunka, Sumida-ku, Tokyo Kao Corporation In-house research laboratory (56) References JP-A-4-141196 (JP, A) JP-A-63-25529 (JP, A) JP-A-6-180322 (JP, A) JP-A 52-162409 (JP, U) JP-A 1-167643 (JP, U) (58) Fields investigated (Int. Cl. ⁷⁾ G01N 21/00-21/61 G01N 1/00 F17D 1/08

Claims (1)

(57) [Claims] An end of a bypass pipe is connected to a main pipe through which a fluid flows, and a turbidity meter and turbidities located on both sides of the turbidity meter are connected to the bypass pipe to make the fluid stationary.
The first and second bypass gate valves, which are closed at the time of measuring the degree of fluidity, are arranged in series , and the fluid is introduced into the bypass pipe before the turbidity measurement to the part of the main pipe bypassed by the bypass pipe.
The main sluice valve is closed to close the turbidity meter.
Gas as a cleaning fluid is constantly sprayed on the outer surface of the measurement surface
Turbidity evaluation device in a pipe equipped with a gas supply nozzle .