JPH0710289Y2 - Detector with washer - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a detector with a washer such as a dissolved oxygen detector used in a sewage treatment plant.

B. Outline of the Invention The detector with a washer of the present invention comprises an electrode provided in the vertical direction, a cylindrical casing having a stepped portion and a hole communicating with the inside and outside at the lower end portion surrounding the electrode, and the electrode of the electrode. An annular support member that supports the lower end and the lower end of the casing, and is fitted in the step portion of the casing and sandwiched by the support member, and a large number of bubble holes are formed in an annular shape along the entire circumference of the electrode. An aerator and an air pipe joined to the casing to supply air to the aerator through the holes of the casing have a vertically split shape.

C. Conventional technology Dissolved oxygen (DO) control is one of the important factors in the management of sewage treatment plants. For the DO value measurement of the aeration tank required for DO management, an automatic measuring instrument using an electrode type DO detector is generally used, and a cleaning means is added to the DO detector.

Fig. 4 shows the structure of a conventional DO measuring instrument.
1, The DO detector 10 with a washer having the washer 45 is immersed in water.
The electrode 11 emits a redox current proportional to the amount of oxygen dissolved in water, and this current signal is guided to the conversion amplification section 41, and the conversion amplification section 41 instructs conversion of the DO value. A cleaning device 42 having a cleaning control circuit 43 and a timer 44 is added to the DO measuring instrument, and cleaning is provided in the DO detector 10 via the cleaning control circuit 43 at regular intervals according to a command from the timer 44. vessel
The electrode 11 is cleaned by 45.

Fig. 5 shows a conventional DO detector equipped with a cleaning device. Cleaning means using air bubbles (Japanese Patent Publication No. 54-20156, Japanese Utility Model Publication No. 55-44207)
Is used. The cleaning air is supplied from an air pump (not shown), passes through the air pipe 55, and enters the aerator 53 from the air metal fitting 56 through the indicator 52. Aerator
In 53, bubble holes 57 are arranged on both sides as shown in FIG. 6, and the air passes through the hatched portions a on both sides of the electrode 11 from the bubble holes 57 and rises to clean the electrode 11. ing.

D. Problems to be solved by the device Although the DO detector having such a structure has a cleaning function,
When used continuously under severe water conditions, the electrode 11,
Further, the adhesion of dirt to the entire DO detector 10 progresses, and particularly, the contamination of the portions of both sides of the electrode 11 in the aerator 53 shown in FIG. Ten
Had to be raised and cleaned. Also, the air pipe 55
Since it is provided away from the casing 54, it is easy for dirt to adhere to the air pipe 55 and the air fitting 23 and to be tangled with foreign matters.

The present invention has been made in view of such problems of the conventional technology, and its purpose is to prevent the contamination of electrodes such as the DO detector, PH detector, and ion electrode, (EN) A detector with a washer that does not require cleaning by pulling the detector out of water for a long period of time.

E. Means for Solving the Problems In order to achieve the above object, the detector with a washer of the present invention has an electrode provided in the vertical direction, and a stepped portion surrounding the electrode and a hole communicating with the inside and outside of the lower end portion. A cylindrical casing provided with, an annular support that supports the lower end of the electrode and the lower end of the casing, and is sandwiched by the support while being fitted into the stepped portion of the casing, and the entire circumference of the electrode. It is composed of an aerator in which a large number of bubble holes are formed in a ring shape, and an air pipe joined to the casing to supply air to the aerator through the holes of the casing is vertically split.

F. Action Air is sent to the aerator through a hole at the bottom of the casing from an air pipe with a vertically split pipe shape.

Since a large number of bubble holes of the aerator are formed in a ring shape toward the entire circumference of the electrode, the bubbles from the bubble holes come in contact with the entire surface of the electrode and rise, so that the entire surface of the electrode is cleaned.

As the air pipe is joined to the casing in a vertically split pipe shape, the shape between the casing and the pipe is relatively smooth and dirt may be attached or impurities may get entangled. Disappear.

Since the aerator is fitted in the lower end step portion of the casing and is held by the support body, its mounting and mounting structure are extremely simple.

G. Examples Examples will be described with reference to the drawings.

FIGS. 1 to 3 show a DO detector in which an electrode 11 is provided in the longitudinal direction at the center, and a flange 16 provided at the lower end of the electrode 11 is screwed into a threaded portion 18 at the lower end of an annular support 12. It is fixed by a member (not shown).

The casing 13 is provided with a step portion 20 and a hole 23 at the bottom,
The lower end is screwed 19 with the support 12. The aerator 14 is provided with a large number of air bubble holes 17 that extend toward the entire circumference of the electrode 11 in an annular shape at equal intervals, and is fitted into the step portion 20 of the casing 13 and is supported by the upper end of the support body 12.

In the upper part of the support 12, there is an annular hole 21 that extends upward, and this hole
A hole 22 communicating with the outside is formed in 21. casing
A hole 23 is formed in the lower portion of the casing 13 so as to face the hole 22, and a pipe 15 having a vertically split pipe shape is joined to the outer portion of the casing 13 so that the lower end covers the hole 23. . The diameter of the pipe used as the air pipe 15 is at least about 10φ so that suspended matter in water will flow backward and will not be easily blocked even if it accumulates in the pipe.

Then, when the DO detector constructed in this way is immersed in water and air is sent from the air pipe 15, the air will be released into the hole 2
Bubbles 17 are blown out from the bubble holes 17 of the aerator 14 through the 3, 22 and annular holes 21 and rise along the electrodes to clean the entire surface of the electrodes.

As a result of comparatively measuring the DO detector according to the present invention and the conventional DO detector, the DO measurement values did not substantially differ due to the difference in the arrangement of the bubble holes. Further, in the device of the present invention, since the bubbles are discharged over the entire circumference of the electrode, the cleaning effect is remarkably improved. Further, according to the present invention, since the air pipe in which the pipe is vertically split is joined to the casing, the surface shape becomes smooth, and the air pipe or the like is contaminated.
No foreign matter was entangled.

H. Effect of the Invention Since the present invention is configured as described above, it has the following effects.

Since the air bubbles pass through the entire circumference of the side surface of the electrode, the adhesion of dirt is eliminated over the entire circumference of the electrode, which facilitates maintenance.

The protrusions on the surface of the detector are kept to a minimum, dirt is prevented from being attached, and foreign substances are not caught, and maintenance work can be reduced.

Since the air pipe and the casing are joined together to form an integral structure, assembly and disassembly work is easy, and the time and effort required for disassembly and cleaning work can be reduced.

In addition to the DO detector, it can be applied to, for example, a PH detector, a detector such as an ion electrode.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention.
The figure is a partial front view showing a partial cross section, FIG. 2 (a) is a plan view of the aerator, FIG. 2 (b) is a side view showing the aerator in a partial cross section, and FIG. 3 is A of FIG. FIG. FIG. 4 is a configuration diagram of the DO measuring device, FIG. 5 is a front view of a main part showing a conventional DO detector in a partial cross section, FIG. 6 (A) is a plan view of an aerator in the same detector, and FIG. (B) is a side view showing the aerator in a partial cross section. 11 ... Electrode, 12 ... Support, 13 ... Casing, 14 ...
Aerator, 15 ... Air tube.

Claims (1)

[Scope of utility model registration request] 1. A vertically-arranged electrode, a cylindrical casing surrounding the electrode and having a stepped portion and a hole communicating with the inside and the outside at the lower end portion, and an annular support for supporting the lower end of the electrode and the lower end of the casing. A body, an aerator fitted in the stepped portion of the casing and supported by the support body, and an aerator having a large number of bubble holes formed in an annular shape toward the entire circumference of the electrode, and a casing outside the casing. An air pipe for supplying air to an aerator, the air pipe being formed by joining members each having a vertically split pipe so as to cover the hole of the detector with a washer.