JP3442729B2 - Electrode level gauge - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode type liquid level gauge for detecting the height of a liquid surface by electrical conduction due to a liquid junction between a plurality of electrode rods.

[0002]

2. Description of the Related Art An electrode type liquid level gauge has a plurality of electrode rods having different lengths attached to an electrode holder, and the lower end of the electrode rods having different lengths comes into contact with or separates from the liquid due to rising or lowering of the liquid level. The position of the liquid surface is detected by utilizing the electrical connection due to the liquid junction between the electrode rods in contact with the liquid surface.

A conventional electrode type liquid level gauge is, for example, as shown in FIG. 2, in which a plurality of electrode rods 3 made of metal rods having different lengths are attached to an electrode holder 15. That is, each electrode rod 3 is fixed to the electrode holder 15 made of an insulating material such as a synthetic resin or ceramic by using the support fitting 4, and the upper portion of the electrode holder, the upper end portion of the support fitting 4 protruding into the cylindrical portion 13 is electrically connected. The electrode wiring 7 for signal extraction is connected.

The electrode wiring 7 is formed on the upper part of the electrode holder 15,
It is led out to the outside through an electrode wiring take-out port 11 provided in the cylindrical portion, and is connected to a predetermined measuring device.

According to the electrode type liquid level gauge shown in FIG. 2, for example, when the electrode rod having the longest liquid level and the electrode rod having the next longest liquid level are in contact with each other, the liquid junction between these two electrode rods causes an electrical effect. Since a predetermined current flows by conducting to, the position of the liquid surface can be detected by detecting this current.

[0006]

When the electrode type liquid level gauge shown in FIG. 2 is used in a contaminated waste water tank in which manure is mixed in an apartment, a hotel, etc., a plurality of electrode rods are not in contact with the liquid surface. Nevertheless, there is a major drawback that electrical conduction occurs and false detection occurs.

The electrode type liquid level gauge of the present invention prevents electrical conduction between the electrode rods when the electrode rods are not in contact with the liquid surface, so that erroneous detection does not occur, and corrosion of the electrode rods by the liquid does not occur. It is an object of the present invention to provide an electrode type liquid level gauge that can be prevented and can be used stably for a long period of time.

[0008]

In order to achieve the object, an electrode type liquid level gauge provided by the present invention is one in which electrode rods 3A and 3B are fixed to a support fitting 4 integrated with an electrode holder 15 shown in FIG. that electrode electrically conductive to the lower end of the rod so that to expose the possible length Rutotomoni, the electrode rod with a predetermined distance between the electrode rod with an insulating pipe 1 mounted to the electrode holder 15
A ventilation hole 12 is formed in the surrounding portion so as not to be immersed in the insulating pipe .

Then, the liquid is prevented from flowing between the lower end portion of the insulating pipe 1 which covers the electrode rods 3A, 3B by exposing the length capable of electrical conduction and the electrode rod, and the electrode rod is prevented from corroding. Included free fit the sealing plug 10, such as a synthetic rubber as a method for preventing.

In the electrode rod 3C, only a part of which the lower end portion is electrically conductive is in contact with the liquid surface and is not submerged.
There is no electrical conduction between multiple electrode rods, and false detection does not occur. No corrosion by liquid. Therefore, it is not necessary to attach the insulating pipe 1.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the electrode type liquid level gauge of the present invention, a plurality of electrode rods are fixed to a support fitting integrated with an electrode holder, and the lower end portion of the electrode rod is electrically connected by an insulating pipe attached to the electrode holder. Since the conductive length is exposed and covered, there is no electrical conduction between the electrode rods when the electrode rods are not in contact with the liquid surface, and erroneous detection does not occur.

By inserting a sealing stopper made of synthetic rubber or the like into the lower end portion of an insulating pipe which covers a plurality of electrode rods by exposing a length allowing electrical conduction, a gap between the metal electrode rod and the insulating pipe is inserted. Therefore, it is possible to provide an electrode type liquid level gauge which can be stably used for a long period of time because it prevents the liquid from flowing into the gap and prevents the corrosion of the metal electrode rod.

As shown in FIG. 1, the insulating pipe 1 covers the electrode rods 3A and 3B in a wrapped manner, and a sealing plug 10 made of synthetic rubber or the like is fitted into the lower end portion of the electrode rod 3A, 3B. Since the air is contained in the air, expansion and contraction may occur due to changes in the air temperature and the liquid temperature, and the sealing plug 10 may fall off. A ventilation hole 12 is provided to allow easy inflow and outflow of air.

[0014]

EXAMPLE A specific example of an electrode type liquid level gauge according to the present invention is shown in FIG.
It will be described based on. First of all, in the present invention, the electrode holder 1 which does not wrap around the supporting metal member 4 and which is projected
There is a male screw on the bottom of 5. Further, a female screw is cut at the lower end of the support fitting 4 and a male screw is cut at the upper end thereof. The electrode rods 3A, 3B,
The upper male screw portion of 3C is screwed in and fixed with the lock nut 5. The electrode rod 3 is attached to the male screw part at the bottom of the electrode holder 15.
A female screw portion of the upper end portion of the insulating pipe 1 which covers the lower end portions of A and 3B by exposing a length capable of electrically conducting is fitted and attached. (The insulation pipe 1 may be attached to the electrode holder 15 by any method, for example, by using a cable tie made of vinyl or a string made of vinyl, and tying it to the protrusion under the electrode holder.)

A hole is made in the assembled electrode holder 15 on the upper lid portion made of an iron plate or the like of a waste water tank or a waste water tank, and by using several screw holes 14 provided on the flange portion 2, a mounting screw or the like is used. Fix it.

The upper cylindrical portion 1 of the fixed electrode holder 15
The electrode wiring 7 is attached to the upper end portion and the male screw portion of the support fitting 4 protruding into the inside 3 by using the electrode wiring attachment nut 6 and the washer 8, and is led out to the outside through the electrode wiring outlet 11 to be connected to the measuring instrument.

The history of the invention of the electrode type liquid level gauge of the present invention shown in FIG. 1 will be briefly described. In early April 1999, one of two sewage pumps in the sewage tank of the resort apartment where I work had a failure, so the failed pump was replaced and a new automatic control panel was installed to replace the conventional electrode level gauge (new).
, And the automatic alternating operation was started.

However, erroneous detection occurred immediately after use.
Since the distance between multiple electrode rods is as small as 15 mm, electrical conduction occurs between the electrode rods even when the liquid is not in contact with the electrode rods. The electrode rods were attached at a distance of about 500 mm and used, but the results did not change and erroneous detection occurred again.

In the beginning of August of the same year, the lower end portion of the first longest electrode rod of the electrode type liquid level gauge (the second longest electrode rod is separated by about 500 mm) is exposed to a length capable of electrical conduction. I covered it with a vinyl chloride pipe attached to the electrode holder. As a result, no false positives have occurred.
At present, it has been running smoothly for about 10 months since the above method was taken in June 2000, and is expected to continue in the future. It is the electrode type liquid level gauge shown in FIG. 1, which is produced by the above experimental results.

[0020]

According to the present invention, erroneous detection due to electrical conduction between electrode rods when the electrode rods are not in contact with the liquid surface does not occur, corrosion of the electrode rods due to the liquid can be prevented, and long-term It is possible to provide an electrode type liquid level gauge capable of stable use of

[Brief description of drawings]

FIG. 1 is a sectional view showing an electrode type liquid level gauge of the present invention.

FIG. 2 is a sectional view showing a conventional electrode type liquid level gauge.

[Explanation of symbols]

1 Insulated pipe 2 Flange part 3 electrode rods (A, B, C) 4 Support bracket 5 lock nuts 6 electrode wiring mounting nut 7 electrode wiring 8 washers 9 Lid 10 Sealing plug 11 Electrode wiring outlet 12 vents 13 Cylindrical part 14 screw holes 15 Electrode holder

Claims (2)

(57) [Claims] To 1. A support bracket integral with the resin of the electrode holder, and fixing a plurality of electrode bars of different lengths, to expose the lower portion only capable of electric conduction length Rutotomoni,
Between the electrode rod and the insulating pipe attached to the electrode holder
Enclose the electrode rod at a specified interval and
Ventilation hole is opened in the non-existing part and sealed at the lower end of the insulating pipe
Electrode type liquid level gauge, which is equipped with a stopper . 2. A shortest electric charge is obtained by fixing a plurality of electrode rods having different lengths to a support metal fitting integrated with a resin electrode holder.
Rutotomoni electrical conduction caused is exposed by a length as possible lower end of the electrode rod excluding Gokubo, the electrode rod with a predetermined distance between the electrode rod with an insulating pipe attached to the electrode holder
Enclose and open a vent in the part that the insulation pipe does not soak,
And characterized in that fitted with tight sealing plug at the lower end portion of the insulated pipe
Electrode type liquid level meter for.