JPS62261929A - Liquid level detector - Google Patents

Abstract

PURPOSE:To obtain a durable, small-sized detecting device which has simple mechanism by arranging a carbon electrode or similar electrode so that its tip part is at the liquid level in a liquid storage tank. CONSTITUTION:A liquid level container 9 is made of a conductor and contains liquid 2, and a conductor 3 is connected. An electrode 4 uses the carbon electrode or similar electrode and the electrode 4 is arranged at the upper-limit position of the liquid level 6 by using a conductor 5 which is insulated from the liquid 2. Similarly, an electrode 7 made of a material similar to that of the electrode 4 is arranged at the lower-limit position of the liquid level 6 by using a conductor 6 insulated from the liquid 2. Consequently, the values of electric resistances between the electrodes 4 and 7, and container 9 are utilized to detect the liquid 6 being at the upper-limit position, between the upper-limit and lower-limit positions, or below the lower-limit position from the difference between the value of the liquid 2 and the infinite value when the liquid 2 leaves the electrode 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid level detection device. Conventionally, this type of liquid level detection has been done mechanically by floating a float on the liquid surface and quantitatively detecting the extent to which the float moves vertically according to the vertical movement of the liquid level. The liquid level was detected by doing this. Another method is to set a sound source at a certain or predetermined location, send sound waves from that sound source toward a liquid surface such as water, and detect the liquid level while checking the reflection time. It's here.

In addition, in drippers, etc., as a means of continuous dripping, a capacitance detector is attached to the liquid level forming part of the internal structure of the dropper to detect the level of the dripping liquid. It's here.

However, although the first example is mechanically simple, it has drawbacks such as poor durability since the float portion touches the liquid surface, and difficulty in installation due to its large size.

The second example also has the disadvantage that it requires separate parts for transmitting and receiving sound waves, and also requires a complicated electrical circuit to measure the time from transmission to reception.

Furthermore, the third example has drawbacks such as being inconvenient to handle, such as not being able to achieve high precision due to static electricity, and requiring adjustment due to differences in dielectric constant between liquids, and lacking in durability.

The liquid level detector of the present invention focuses on the above-mentioned drawbacks and aims to eliminate those drawbacks.

Next, in order to achieve the above object, the liquid level detector of the present invention has the following features:
A carbon electrode or a similar electrode is provided so that the tip thereof is located at the liquid level in the liquid storage tank.

Next, the present invention will be explained with reference to the drawings.

Figure 1 is a sectional view of one embodiment of the present invention. be.

The liquid level container 9 is a container made of a conductor, and is regarded as a common electrode 1. The container 9 contains a liquid 2, and a conductive wire 3 is connected to the container.

A carbon electrode or an electrode similar thereto is used as the electrode 4. This electrode has a conducting wire 5 insulated with the liquid, and the electrode 4 is arranged so as to be at the upper limit of the liquid level 6.

Similarly, a carbon electrode or a similar electrode is used as the electrode 7, and this electrode has a liquid-insulated conducting wire 8.
This electrode 7 is arranged so as to be at the lower limit of the liquid level 6.

Depending on the difference between the electrical resistance value of the liquid between each electrode and the container and the value when the liquid is separated from the electrode and becomes infinite, whether the liquid level is at the upper limit or between the upper and lower limits. It can be detected whether it is in between or below the lower limit.

Although two electrodes have been described here, by using one or more electrodes, it is possible to measure the liquid level height with accuracy depending on the application.

FIG. 2 is a sectional view of another embodiment of the present invention.

A liquid 2 is contained in a liquid level container 9, and a carbon electrode or similar electrode 1 is provided vertically in the container and has a conducting wire 3.

A carbon electrode or an electrode similar thereto is used as the electrode 4. This electrode has a conducting wire 5 insulated with the liquid, and the electrode 4 is arranged so as to be at the upper limit of the liquid level 6.

Similarly, a carbon electrode or a similar electrode is used as the electrode 7, and this electrode has a conducting wire 8 insulated with the liquid, and the electrode 7 is arranged so as to be at the lower limit of the liquid level 6.

Depending on the difference between the electrical resistance value of the liquid between each electrode and the container and the value when the liquid becomes infinite when separated from the electrode, the liquid level is at the upper limit or between the upper and lower limits. Is it in
It can be detected whether the value has fallen below the lower limit.

Although two electrodes have been described here, by using one to an arbitrary plurality of electrodes, the liquid level can be measured with an accuracy of the liquid level depending on the application.

Figure 3 shows an example in which a large number of electrodes are arranged in the second embodiment, with electrodes 11, 12, ..., 20 arranged to detect the height of each liquid level, and the conductor wires of those electrodes. 21, 22, .

Common electrode 1 and electrodes 11, 12, ... 20 according to each height
The position of the liquid level can be detected by the difference between whether the electrical resistance value between the two is the resistance value of the liquid, or whether it is infinite because it is not in contact with the liquid.

As explained above, the present invention uses carbon or a similar material for the electrode, takes advantage of the stable characteristics of carbon, and allows the electrode to be used in water, acidic liquids, alkaline liquids, plating liquids, etc. without causing chemical changes. Easily and stably measure the height of various liquids, such as chemical solutions, excrement dilutions, hot spring supply water, food-related liquids, such as beer, milk, fruit juice, and soft drinks, or other liquids over a long period of time. ,
There are effects that can be detected.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a first embodiment of the invention. FIG. 2 is a sectional view of a second embodiment of the invention. FIG. 3 is a sectional view of a third embodiment of the invention. 1...Common electrode 2...Liquid whose liquid level height is to be measured 3...Common electrode conductor 4...Carbon electrode or similar material electrode for detecting the upper limit of liquid level 5...Upper limit electrode conductor 6...Liquid level 7... Electrode 8 made of a carbon electrode or a similar material for detecting the lower limit of the liquid level...Conducting wire 9 of the lower limit electrode of the liquid level...Containers 11 to 20...Charcoal arranged according to the height of the liquid level
Bare electrodes or electrodes made of similar materials

Claims (1)

[Scope of Claims] 1. A liquid level detection device in which a carbon electrode or a similar electrode is arranged so that its tip is located at the liquid level in a liquid storage tank. 2. In the liquid level detecting device having the structure set forth in claim 1, the electrode is moved vertically so that the middle part of the electrode is always located at the position of the liquid level; A liquid level detection device characterized in that a plurality of other electrodes are arranged corresponding to the electrodes.