JPH04198722A - Water level sensor - Google Patents

Abstract

PURPOSE:To bring only the tip section of an electrode body into vertical contact with the water surface and prevent an erroneous action due to the sticking of a sediment by fitting the electrode body perpendicularly folded at the middle position to the side wall of a water storage tank so that the tip section coincides with the desired water level. CONSTITUTION:A water level sensor 8 is perpendicularly folded at the middle position of an electrode body 1 and fitted to the side wall of a water storage tank 9 so that the tip section coincides with the desired water level. When water is fed to the tank 9 and the water surface rises to reach the tip section of the electrode body 1, the current value flowing in the electrode body 1 is changed by the specific resistance of water, and the completion of water feed is detected. When the water feed is completed, only the tip section of the elec trode body 1 of the sensor 8 is brought into contact with water, and the sensor 8 is not submerged. The tip section is kept perpendicular to the water surface, and the sticking of a sediment such as scale is prevented. An erroneous action due to the sticking of the sediment in use for a long period can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a water level sensor that detects water volume and water level using the resistivity of water stored in a water tank.

[Prior Art] Conventional water level sensors of this type include those shown in FIGS. 4 to 6. Figures 4 and 5 are diagrams showing the configuration of a conventional water level sensor, in which (1a) is an electrode body, (2
) is a plug made of insulator, (3) is a tab terminal, (
4) shows an insulating cover, (5) shows a cable, (6) shows a connection terminal, and (7) shows a terminal cover.

FIG. 6 is a diagram showing how the water level sensor shown in FIGS. 4 and 5 is used, in which (8a) shows the water level sensor and (9) shows the water tank.

Next, the operation will be explained. The operation of the water level sensor is well known, and a detailed explanation will be omitted here, but as shown in Fig. 6, it is attached to a predetermined position on the side wall of the water tank (9). When water supply starts, the water level in the water tank (9) rises, and the water level surface reaches the electrode body (1a).
When the height of the electrode body (1a) is reached, the electrode body (1a) comes into contact with water, and the value of the current flowing through the electrode body (1) changes depending on the specific resistance of the water, and the desired amount of water is supplied by this change in the current value. is detected, and an action such as closing a water supply valve is performed.

Therefore, when the desired amount of water has been supplied into the water storage tank (9), the water level sensor (8) is submerged in water as shown in FIG. An insulating cover (4) is provided to prevent rust from forming.

[Problems to be Solved by the Invention] The conventional water level sensor as described above is constructed as described above, and since the entire water level sensor is submerged in water, the plug is formed of an insulating material or an insulating cover is provided to prevent the occurrence of rust. However, when used for a long period of time, deposits such as limescale and calcium adhere to various parts including the electrode body, causing malfunctions.

The present invention was made to solve this problem, and aims to provide a water level sensor that has a simple structure, prevents deposits from adhering to the water level sensor, and prevents malfunctions even after long-term use.

[Means for Solving the Problems] A water level sensor according to the present invention includes an electrode body that is bent at right angles at an intermediate position and whose tip is directed toward the bottom of the water tank, and the tip of the electrode body is connected to a desired water level. It was decided to match them and attach them to the side wall of the water tank.

[Operation] The water level sensor of the present invention includes an electrode body that is bent at right angles at an intermediate position and has its tip facing the bottom of the water tank, and the water is stored by aligning the tip of the electrode body with a desired water level. Since it is attached to the side wall of the tank, only the tip of the electrode comes into contact with the water perpendicular to the water level.

[Example 1] An example of the present invention will be described below with reference to the drawings. Figures 1 to 3 are diagrams showing an embodiment of the present invention, and Figures 1 and 2 are diagrams showing the configuration of a water level sensor in this embodiment. electrode body, (2) is a plug made of insulator, (3) is a tab terminal, (4) is an insulating cover, (5) is a cable, (6)
indicates a connection terminal, and (7) indicates a terminal cover.

FIG. 3 is a diagram showing how the water level sensor shown in FIGS. 1 and 2 is used, and (8) is the water level sensor in this embodiment;
(9) indicates a water tank.

As shown in FIGS. 1 and 2, the water level sensor in this embodiment is provided with an electrode body (1) that is bent at right angles at an intermediate position and whose tip is directed toward the bottom of the water tank (9). , the electrode body (1) is attached to the side wall of the water tank (9) with the tip of the electrode body (1) aligned with the desired water level.

Next, the operation will be explained. When the water supply to the water tank (9) is started, the water level in the water tank (9) rises, and the water level reaches the tip of the electrode body (1). The water level surface is the electrode body (1)
When reaching the tip of the electrode body (1), the specific resistance of the water
It is possible to detect that the desired amount of water has been supplied by changing the value of the current flowing through the valve, and take an action such as closing the water supply valve. Therefore, when the desired amount of water has been supplied into the water storage tank (9), only the tip of the electrode body (1) of the water level sensor (8) comes into contact with the water as shown in FIG. (8) It is possible to prevent the entire structure from being submerged in water. In addition, since the tip that comes into contact with water is located perpendicular to the water level, even after long-term use, deposits such as limescale and calcium may accumulate on the tip of the electrode body (1), the plug (2), and other parts. This prevents the product from adhering to the parts, and prevents malfunctions due to deposits even after long-term use.

In the above embodiment, a case has been described in which the level of water stored in the water tank (9) is detected, but the same effect can be achieved not only when detecting the level of water but also other liquids.

[Effects of the Invention] As explained above, the present invention has the effect of preventing malfunctions caused by deposits.

[Brief explanation of the drawing]

1 to 3 are diagrams showing an embodiment of the present invention, and FIGS. 4 to 6 are diagrams for explaining a conventional water level sensor. In the figure, (1) is the electrode body, (2) is the plug, and (3)
is a tab terminal, (4) is an insulation cover, <5) is a cable,
(6) is a connection terminal, (7) is a terminal cover, (8) is a water level sensor, and (9) is a water tank. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claim] A water level sensor that is attached to the side wall of a water tank and detects when the water supplied in the tank has reached a certain level by contacting the electrode body with the water, wherein A water level sensor comprising an electrode body whose tip is bent toward the bottom of the water tank, and is attached to the side wall of the water tank with the tip of the electrode body aligned with a desired water level.