JP4492850B2 - Contamination prevention structure for electrode bar type water level gauge - Google Patents

Description

  The present invention relates to a structure for preventing contamination of an electrode bar type water level meter, and in particular, can maintain the water level with high accuracy over a long period of time while eliminating the need for periodic maintenance work on the electrode bar for water level detection (maintenance-free). The present invention relates to a foreign matter adhesion prevention structure of an electrode rod type water level meter which can be measured.

  Conventionally, for example, in a sewage treatment tank for treating organic sewage such as sewage, operation control of an aeration stirrer is performed according to the water level of the sewage treatment tank.

  And in order to measure the water level of this sewage treatment tank, an electrode rod type water level meter is widely used.

  By the way, this electrode rod type water level meter is usually provided with a plurality of electrode rods having different lengths so that a plurality of water levels can be measured. In combination with the fact that a plurality of electrode rods are placed close to each other by repeating immersion in the electrode and drying of the electrode rods by lowering the water level, impurities contained in the sewage are By adhering to and drying on the electrode rod and repeating this process, there is a problem in that impurities form a film around the electrode rod, the water level measurement accuracy is lowered, and malfunction occurs.

  For this reason, when this type of electrode bar type water level gauge is used for measuring the water level of sewage or the like containing a lot of impurities, the electrode bar type water level gauge is pulled up periodically, for example, every few months. It was necessary to remove the film of impurities formed around the rod with sandpaper or the like, and there was a problem that the operation of the facility had to be stopped for maintenance work.

  In view of the problems of the conventional electrode rod type water level meter, the present invention can measure the water level with high accuracy over a long period of time while eliminating the need for periodic maintenance work of the electrode rod for water level detection. It is an object of the present invention to provide a structure for preventing contamination of an electrode bar type water level meter.

In order to achieve the above object, the foreign matter adhesion prevention structure of the electrode rod type water level meter of the present invention comprises a plurality of electrode rods having different lengths for detecting the water level , and among these electrode rods, a length for detecting an abnormal water level. A container with a bottomed cylindrical shape that covers the outer periphery of the electrode rods except for the short electrode rods , the upper part is open, and a water passage hole is formed in the lower part, and cleaning water is placed in the container. The water level is higher than the level of sewage in the tank by continuously supplying cleaning water with an amount equal to the amount of cleaning water discharged from the water passage hole into the container. In this way, the sewage in the tank is prevented from entering the container, and the cleaning water supplied into the container overflows into the tank from the upper opening of the container when the water level of the sewage treatment tank is higher than the upper water level. It is characterized by doing so.

In this case, when the water level is lowered by the discharge of sewage, it can be made to stop the supply of wash water into the container from the water supply pipe.

According to the structure for preventing contamination of the electrode rod type water level meter of the present invention, the electrode rod is not immersed in the sewage even if the water level rises. Therefore, even if the water level falls and the electrode rod dries. A film of impurities is not formed around the electrode rod, and the electrode rod for water level detection can be kept clean.
This eliminates the need for periodic maintenance work of the electrode rod for detecting the water level, and allows the water level to be measured with high accuracy over a long period of time.

Further, when the water level is lowered due to the discharge of sewage , the supply of cleaning water from the water supply pipe can be efficiently performed by stopping the supply of cleaning water from the water supply pipe into the container.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the electrode stick type water level gauge contaminant prevention structure of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of an electrode rod type water level meter to which the foreign matter adhesion preventing structure of the electrode rod type water level meter of the present invention is applied.
This electrode rod type water level meter is for measuring the water level of a sewage treatment tank for treating organic sewage such as sewage, for example, and is not particularly limited. Electrode rods 1a, 1b, 1c, 1d for detecting the water level having terminals formed at the lower end of the book, and excluding the electrode rod 1d having a short length for detecting an abnormal water level among the electrode rods, A bottomed cylindrical container 2 that covers the outer periphery of 1c , has an upper opening, and has a water passage hole 2a formed in the lower part, and a water supply pipe 3 that supplies cleaning water into the container 2. The cleaning water is supplied into the container 2 to prevent the infiltration of sewage into the container 2.

  In this case, the container 2 is preferably composed of a transparent bottomed cylindrical body made of a synthetic resin so that the electrode bars 1a, 1b, 1c, and 1d for detecting the water level can be observed from the outside. To.

In addition, the amount of cleaning water supplied from the water supply pipe 3 into the container 2 (not particularly limited, for example, 0.02 m ³ / min) is discharged from the water passage hole 2 a formed in the container 2. The amount of washing water is approximately balanced (except for the case of the high water level (constant water level) HH shown in FIG. 1C), and the washing water supplied from the water supply pipe 3 causes the Set the wash water level so that it does not rise naturally.

Thereby, as shown in FIG. 1A, this electrode rod type water level meter continuously supplies cleaning water from the water supply pipe 3 into the container 2 so that the water level of the sewage treatment tank is at the low water level HL. When the water passage hole 2a formed in the container 2 is in the air, the water level in the container 2 becomes a position near the lower end of the lowest electrode rod 1a, and as shown in FIG. 1 (b), the water level in the sewage treatment tank When the water passage hole 2a formed in the container 2 at the middle water level HM is in the sewage, the water level in the container 2 is a position near the lower end of the middle electrode rod 1b (for detecting the stirrer stop water level). As shown in c), when the water level in the sewage treatment tank is the upper water level (constant water level) HH and the water passage hole 2a formed in the container 2 is in the sewage, the upper electrode rod 1c (stirrer) This is the position near the lower end of the operating water level detection).
In this case, as shown in FIG. 1 (c), when the water level of the sewage treatment tank is the upper water level (constant water level) HH and the water passage hole 2a formed in the container 2 is in the sewage, the water is supplied into the container 2. wash water so as to overflow from the container 2.

In this embodiment, the washing water is continuously supplied from the water supply pipe 3 into the container 2, but when the water level of the sewage treatment tank is above a certain level (specifically, in the sewage treatment tank When sewage is introduced and the water level exceeds a certain level), the wash water is continuously supplied from the water supply pipe 3 into the container 2 and discharged from the sewage treatment tank to lower the water level. stopping the supply of, i.e., depending on the water level in the sewage treatment tank, and more to supply washing water into the container from the water supply pipe, so as to supply the cleaning water from the water supply pipe 3 effectively However, the supply method (supply timing) of the cleaning water from the water supply pipe 3 is not limited to this as long as the infiltration of sewage into the container 2 can be prevented.

And according to the contamination prevention structure of this electrode rod type water level meter, even if the water level of the sewage treatment tank rises, the electrode rods 1a, 1b, 1c ( here, the electrode rod 1d for detecting the water level abnormality is long) Therefore, even if the water level of the sewage treatment tank rises to the upper water level (constant water level) HH, the water level is not immersed in the sewage in the first place. Even when the electrode rods 1a, 1b, and 1c are dried, a film of impurities is not formed around the electrode rods 1a, 1b, and 1c, and the electrode rod for water level detection can be kept clean. it can.

  As mentioned above, the electrode rod type water level meter according to the present invention has been described with reference to the electrode rod type water level meter for measuring the water level of a sewage treatment tank for treating organic sewage such as sewage. The invention is not limited to the configuration described in the above embodiment, and the configuration can be changed as appropriate without departing from the spirit of the invention, and the use thereof also measures the water level of the sewage treatment tank. For example, it can be widely used for water level measurement applications such as a measurement of the water level of a washing tank.

  Since the contamination prevention structure of the electrode bar type water level meter of the present invention can measure the water level with high accuracy over a long period of time while eliminating the need for periodic maintenance work of the electrode bar for water level detection, In addition to being suitably used for water level detection in a sewage treatment tank for treating organic sewage such as sewage, it can also be widely used for other water level detection applications.

1 shows an embodiment of the structure for preventing contamination of an electrode bar type water level meter according to the present invention, wherein (a) shows a low water level state, (b) shows a middle water level state, and (c) shows an upper water level (constant water level). ) Is a vertical cross-sectional view of an electrode rod type water level gauge, respectively, and (d) is a cross-sectional view of the electrode rod type water level meter.

DESCRIPTION OF SYMBOLS 1a Electrode rod 1b Electrode rod 1c Electrode rod 1d Electrode rod 2 Container 2a Water flow hole 3 Water supply pipe

Claims (2)

It has a plurality of electrode rods with different lengths for detecting the water level, covers the outer periphery of the electrode rods except for the electrode rods with a short length for detecting the water level abnormality, opens at the top, and passes through the bottom. Washing water discharged from the water supply pipe through the water passage hole into the container , comprising a bottomed cylindrical container having a water hole and installed in the tank and a water supply pipe for supplying the cleaning water into the container. By continuously supplying wash water with an amount of water that is commensurate with the amount of water in the tank, the level of sewage in the tank is maintained to be higher than the level of sewage in the tank to prevent the intrusion of sewage in the tank and the level of the sewage treatment tank A structure for preventing the adhesion of contaminants to an electrode rod type water level meter, wherein the cleaning water supplied into the container overflows into the tank from the upper opening of the container when the water level is higher than the upper water level . 2. The structure for preventing the adhesion of contaminants to an electrode rod type water level meter according to claim 1, wherein the supply of cleaning water from the water supply pipe into the container is stopped when the water level drops due to discharge of sewage .

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