JP2004077440A - Electrode for detecting water level - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode for detecting a water level to properly control a water level in a condensation reaction vessel and the like without impairing a water level detecting function by easily eliminating foreign matters on a liquid contact surface. <P>SOLUTION: An outer peripheral face of a conductor is formed as the liquid contact surface 1 expanded at its upper part and narrowed at its lower part, and a plurality of grooves 3, 3 ... are formed from the upper part to the lower part of the liquid contact surface 1. For example, when it is used to control the water level in the condensation reaction vessel, the foreign matters mixed in the stirred flow generated by stirring in the vessel, are slipped off by dead-weight and the action of the surface tension of a water surface in accompany with the lowering of the water level in the vessel, even though the foreign matters are stuck to the liquid contact face 1 by coming on the flow, whereby errors in controlling the water level can be prevented. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides, for example, a water level control in a flocculation reaction tank for flocculating a sewage water as a pretreatment for feeding raw sludge to a screw-type filtration dewatering apparatus in a sewage treatment operation. The present invention relates to a water level detection electrode suitable for controlling a water level in a water tank in which many objects are mixed.
[0002]
[Prior art and its problems]
Conventionally, the electrode for detecting the water level is rod-shaped or plate-shaped, and when used for controlling the water level in the agglutination reaction tank where a large amount of contaminants are present, a large amount of contaminants are entangled in a hairball shape in the liquid contact part of the electrode and detected. Function is impaired. In particular, as shown in FIG. 4, when hair or string-like impurities S are entangled with the liquid contact portion 11 of the electrode, the impurities S are separated even if the water level in the tank drops and the lower end of the electrode separates from the water surface. Without doing so, as shown in FIG. 5, the lower part of the suspended foreign matter S comes into contact with water, resulting in malfunction of the water level control. Therefore, there is a drawback that the operation of removing impurities must be frequently performed.
[0003]
[Object of the invention]
An object of the present invention is to prevent a foreign substance from being easily entangled with a liquid contact surface, easily detach even if entangled, and without impairing the water level detection function, for water level detection suitable for water level control in an agglutination reaction tank or the like. It is to provide an electrode.
[0004]
Configuration of the Invention
In the water level detection electrode according to the present invention, the outer peripheral surface of the conductor is formed on a liquid contact surface which is expanded to a large diameter at an upper portion and narrowed to a small diameter at a lower portion, and is formed from an upper portion to a lower portion of the liquid contact surface. A plurality of grooves are provided toward.
[0005]
【Example】
An embodiment will be described below with reference to FIGS.
[0006]
Numeral 1 denotes a liquid contact surface formed on the outer peripheral surface of the conductor, which is expanded to a large diameter at the upper part and narrowed to a small diameter at the lower part to form a conical or hemispherical shape. A plurality of grooves 3 are arranged from the lower part to the lower part. The grooves 3 are responsible for increasing the surface area in contact with liquid to enhance the detection function, and at the same time, reducing the adhesive force of the contaminants to improve their releasability. Reference numeral 2 denotes a mounting arm for mounting on a tank wall of an agglutination reaction tank or the like, and is provided so as to be extended above the liquid contact surface 1.
[0007]
When an electrode-type detector is used for controlling the water level in the agglutination reaction tank, impurities mixed in the stirring flow generated by stirring in the tank try to get on the liquid contact surface 1 of the electrode by riding the flow. I do. In this case, if the electrode is rod-shaped or plate-shaped, string-like impurities are strongly entangled and cannot be separated, but the liquid contact surface 1 of the electrode of the present invention has a large diameter at the upper part and a lower part at the lower part. Due to the small diameter and the small contact surface area with the foreign matter due to the presence of the grooves 3, 3, even if the foreign matter is entangled with the liquid contact surface 1, the foreign matter is reduced in its own weight and the water surface as the water level in the tank falls. Will slide down due to the action of surface tension. Therefore, no malfunction occurs in the water level control.
[0008]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the electrode for water level detection of this invention, since the liquid contact surface area is large and it is excellent in the function of detecting a water level, and since the contact surface area with foreign substances is formed small and the foreign substances are easily slipped off, the agglutination reaction tank is formed. The water level detection function is not impaired even when used in a water tank containing many contaminants such as water level control in the inside.
[Brief description of the drawings]
FIG. 1 is a front view of a water level detection electrode according to the present invention.
FIG. 2 is a side view of a water level detection electrode according to the present invention.
FIG. 3 is a bottom view of a water level detection electrode according to the present invention.
FIG. 4 is a side view of a main part of a conventional water level detection electrode, showing a state when the water level rises.
FIG. 5 is a side view of a main part of a conventional water level detecting electrode, showing a state when the water level is lowered.
[Explanation of symbols]
1 Liquid contact surface 3 grooves

Claims (1)

The outer peripheral surface of the conductor is formed on the liquid contact surface which is expanded to a large diameter at the upper part and narrowed to a small diameter at the lower part, and a plurality of grooves are provided from the upper part to the lower part of the liquid contact surface. An electrode for detecting a water level.

Images