JP3277697B2 - Turbidimeter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a turbidimeter having an automatic washing function.

[0002]

2. Description of the Related Art FIG. 4 is a structural view of a measuring tank of a conventional turbidimeter.
Akirazu, Figure 5 is a fragmentary cross-sectional view of FIG. In the drawing, reference numeral 1 denotes a substantially cylindrical measuring tank, into which a measuring liquid flows, and which overflows from an upper opening 1A of the measuring tank to form a measuring liquid surface. Reference numeral 2 denotes a measurement liquid supply port for supplying the measurement liquid to the measurement tank 1, and a cleaning liquid is supplied during cleaning. Reference numeral 3 denotes an outlet for discharging the measurement liquid and the cleaning liquid from the measurement tank 1. Light is emitted from the light source 4 to the measurement liquid surface, and the light scattered on the measurement liquid surface is measured by the light receiving element 5 to obtain turbidity.

[0003]

In such a conventional turbidity meter, the measuring tank is washed by the force of the washing liquid, but the washing liquid flows only to the portion as shown in FIGS. Therefore, the measurement tank is only partially washed. For this reason, there is a drawback that dirt remaining on the inner wall of the measuring tank drops during the measurement and causes a measurement error.

The present invention has been made in view of such a point, and a cleaning liquid is supplied to a measuring tank from a tangential direction of a circumference through a purified water supply passage provided at a position facing an upper part and a lower part of the measuring tank. The vortex swirling flow is generated by supplying and cleaning the inner wall of the measuring tank.The inner wall of the measuring tank can be evenly cleaned, and measurement can be performed by removing dirt remaining on the inner wall of the measuring tank. Unaffected, the cleaning liquid is supplied while the measurement liquid is flowing to prevent contamination of the light source etc. due to the splash of the cleaning liquid,
Measures turbidity with high accuracy and the washing liquid flows into the measuring tank
It is an object of the present invention to provide a turbidity meter that can cause a measurement liquid to flow into a measurement tank in accordance with the force .

[0005]

To achieve the above object, the present invention provides a turbidity meter having the following structure. (1) A measuring liquid flows in from a lower part of a substantially cylindrical measuring tank, and a measuring liquid surface formed by overflowing the measuring liquid from an upper part of the measuring tank is irradiated with light from a light source, and the scattered light scattered is detected. In the turbidimeter for determining the turbidity of the measurement solution by detecting the measurement solution, the measurement tank is configured to measure the turbidity in which the measurement solution is introduced.
A constant- liquid supply path, provided at opposed positions of an upper part and a lower part of the measuring tank , supplying a cleaning liquid along the inner wall from a tangential direction of a circumference, respectively, and a purified water supply path for cleaning the inner wall part; After cleaning the inner wall portion, a discharge path for discharging the cleaning liquid in the tank, a sequence control circuit for controlling the opening and closing of a cleaning valve provided in the purified water supply path and a drain valve provided in the discharge path, provided. With the measuring liquid flowing into the measuring tank from the measuring liquid supply path, the cleaning liquid is supplied.
A turbidimeter characterized by suppressing the inflow of the cleaning liquid with the measuring liquid and periodically cleaning the measuring tank . (2) According to the momentum at which the cleaning liquid flows into the measuring tank.
Characterized in that the measuring solution is caused to flow into the measuring tank.
The turbidity meter according to (1).

[0006]

The cleaning liquid supply passage is provided at the upper and lower positions of the measuring tank opposite to each other, and supplies the cleaning liquid along the inner wall from the tangential direction of the circumference to generate a swirling swirling flow. Wash. Further, by supplying the cleaning liquid in a state where the measurement liquid is flowing, it is possible to suppress the splash when the power of the cleaning liquid is strong. The discharge path discharges the cleaning liquid containing dirt and the measuring liquid in the tank after cleaning the inner wall portion with the cleaning liquid. Sa
In addition, the measurement liquid is changed according to the momentum at which the cleaning liquid flows into the measurement tank.
May or may not flow into the measuring tank.

[0007]

An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration explanatory view showing one embodiment of the turbidimeter of the present invention, and FIG. 2 is a sectional view of a main part of FIG. In the figure,
Reference numeral 10 denotes a measurement tank into which a measurement liquid is introduced from a measurement liquid supply path 11. Reference numeral 12 denotes a cleaning liquid supply passage for supplying a cleaning liquid for cleaning the inner wall portion of the measuring tank 10, which supplies the cleaning liquid to the measuring tank from a tangential direction of the circumference to generate a swirling swirling flow, thereby cleaning the measuring tank.

The purified water supply path 12 is provided at a position where the upper and lower portions of the measuring tank 10 face each other, and supplies the cleaning liquid to the measuring tank 10 in a spiral manner. Reference numeral 13 denotes a discharge path for discharging the cleaning liquid and the measuring liquid in the measuring tank 10. 1
Reference numeral 4 denotes a cleaning valve for turning on / off the supply of the cleaning liquid, and reference numeral 15 denotes a drain valve for turning on / off the discharge of the cleaning liquid and the measurement liquid. The cleaning valve 14 and the drain valve 15 are controlled by the sequence control circuit 16 so that efficient cleaning is performed.

FIG. 3 is a time chart of a cleaning operation for cleaning the turbidity meter according to the present invention.
(B) shows the operation of the drain valve. With the measurement liquid flowing, the cleaning valve 14 is opened.
When the cleaning valve 14 is opened, the cleaning liquid rushes into the measuring tank from the cleaning liquid supply path 12.

The cleaning liquid that has flowed into the measuring tank 10 generates a swirling swirling flow and removes stains on the inner wall and the opening of the measuring tank. The dirt is discharged from the opening in a state where the cleaning liquid and the measurement liquid are mixed. After time t1, the cleaning valve 14 is closed and the drain valve 15 is opened. After the drain valve 15 is opened and t2 hours later, when the cleaning liquid and the measurement water in the measurement liquid are all discharged, the drain valve 15 is closed and the process returns to the step. The process from now on is repeated several times,
Washing of the measuring tank is completed.

The reason why the cleaning is performed while the measuring liquid is flowing is to prevent the cleaning liquid from splashing from the opening when the power of the cleaning liquid is too strong, thereby preventing the light source and the like from being stained. In the cleaning, whether the measurement liquid flows or not may be determined according to the strength of the cleaning liquid.

[0012]

As described above in detail, in the turbidimeter of the present invention, the cleaning liquid supply passage is provided at the upper and lower positions of the measuring tank opposite to each other, and the cleaning liquid is supplied from the tangential direction of the circumference to the measuring tank. To generate a swirling swirling flow to clean the inner wall of the measuring tank, so that the inner wall of the measuring liquid can be cleaned evenly. Further, by supplying the cleaning liquid while the measurement liquid is flowing, it is possible to suppress the splash when the power of the cleaning liquid is strong and to prevent the light source and the like from being stained. For this reason, the measurement is not affected by the detachment of the dirt remaining on the inner wall of the measuring tank, the dirt on the light source and the like due to the splash of the cleaning liquid can be prevented, and the turbidity can be measured accurately. Further, the cleaning liquid flows into the measuring tank.
The measuring solution flows into or out of the measuring tank according to the momentum.
Or not.

[Brief description of the drawings]

FIG. 1 is a sectional side view of a main part showing an embodiment of a turbidity meter of the present invention.

FIG. 2 is a sectional view of a main part of FIG.

FIG. 3 is a time chart of a cleaning operation for cleaning the turbidity meter of the present invention.

FIG. 4 is a sectional side view of a main part of a measuring tank of a conventional turbidimeter.

FIG. 5 is a sectional view of a main part of FIG.

[Explanation of symbols]

 10 Measuring tank 12 Purified water supply path 13 Drain path 14 Cleaning valve 15 Drain valve

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-123784 (JP, A) JP-A-63-306835 (JP, A) Fully open Showa 60-98040 (JP, U) Really open Showa 54- 24388 (JP, U) Actually open 51-86480 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01N 21/00-21/61

Claims (2)

(57) [Claims] 1. A measuring liquid is introduced from a lower part of a substantially cylindrical measuring tank, and a measuring liquid surface formed by overflowing the measuring liquid from an upper part of the measuring tank is irradiated with light from a light source to scatter the scattered light. In a turbidimeter for determining the turbidity of the measurement liquid by detecting with a detection element, the measurement tank is provided at a position facing the measurement liquid supply path into which the measurement liquid is introduced , and upper and lower parts of the measurement tank. The cleaning liquid is supplied along the inner wall from the tangential direction of the circumference,
A purified water supply path for cleaning the inner wall part, a discharge path for cleaning the inner wall part with the cleaning liquid and then discharging the cleaning liquid in the tank, a cleaning valve provided in the purified water supply path, and a drain valve provided in the discharge path And a sequence control circuit for controlling the opening and closing of the cleaning liquid.
A turbidimeter characterized by suppressing the flow of water and periodically washing the measuring tank. 2. A flow of the cleaning liquid into the measuring tank.
It is characterized in that the measuring solution is caused to flow into the measuring tank as needed.
The turbidity meter according to claim 1, wherein