JP2020012638A - Float and liquid level detection device using float - Google Patents

Abstract

To provide a float that can be reduced in size and thickness, and a liquid level detection device with good detection accuracy.SOLUTION: A float F of the present invention is characterized in that its specific gravity is in a range of 0.16 to 0.18. A liquid level detection device 1 of the present invention includes the float F that floats partially exposing from a liquid level, and a float arm FA having one end locked to the float F and the other end connected to a rotating portion 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a float and a liquid level detecting device using the float.

  As a float for detecting a liquid level, for example, there is a float disclosed in Patent Document 1.

  The float disclosed in Patent Literature 1 is used for liquid level detection by being floated in a state of being partially exposed from a liquid surface to be detected, made of resin foam, and has a specific gravity of 0.25 to 0.1. It is in the range of 60.

JP-A-58-111722

  As fuel tanks become thinner, there is a growing need to more accurately measure the remaining fuel near the bottom of the fuel tank.

  The present invention has been made in view of the above, and an object of the present invention is to provide a float that can be reduced in size and thickness, and a liquid level detection device with good detection accuracy.

The float of the present invention
The specific gravity is in the range of 0.16 to 0.18.

The float is
It is a closed cell foamed float made of nitrile rubber and phenol resin.

The liquid level detector is
A float that is partially exposed from the liquid surface and floats,
A float arm having one end locked to the float and the other end connected to the rotating portion;
It is characterized by having.

  ADVANTAGE OF THE INVENTION According to this invention, the float which can be reduced in size and thickness and the liquid level detection apparatus with good detection accuracy can be provided.

The figure of the float showing one embodiment of the present invention. FIG. 1 is a diagram of a liquid level detection device showing a position embodiment of the present invention. The figure of the float which shows another embodiment of this invention.

  Hereinafter, a vibration detection device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the float F according to the present invention is a closed-cell foamed float made of nitrile rubber and a phenol resin, has a rectangular parallelepiped shape having a width W, a length L, and a thickness T, and has a float arm through hole. H is provided. By increasing the nitrile content of the nitrile rubber to increase the proportion of bubbles inside the float, by setting the width W to about 27 mm, the length L to about 50 mm, and the thickness T to about 10 mm, the specific gravity becomes 0.16 to 0. .18. Also, by increasing the nitrile content, it has the same oil resistance as a conventional float. In the above configuration, it has been empirically found that sink occurs when the specific gravity is less than 0.16, and the desired shape cannot be maintained.

  As shown in FIG. 2, the liquid level detection device 1 includes a float F, a float F having one end connected to the float F, and the other end connected to the rotating unit 2. The change of the resistance value in contact with the moving part 2 is transmitted to an external device such as a meter (not shown) via the electric cord 3.

  By setting the specific gravity of the float from 0.16 to 0.18, there is a margin in buoyancy, so that the float can be reduced in size and thickness, and the liquid level can be detected in a range closer to the tank bottom.

  Therefore, it is possible to provide a float that can be reduced in size and thickness and a liquid level detection device with good detection accuracy.

  Further, since the float arm FA can be made heavier than before, the degree of freedom of the float arm shape is improved.

The present invention is not limited to the above embodiment, and various modifications are possible. In the above-described embodiment, the case where the float has a rounded rectangular parallelepiped shape is exemplified. However, if a sufficient buoyancy can be obtained, the float may have a columnar shape as shown in FIG. A shape in which a part (bottom part) of the columnar shape shown in b) is flattened may be used.
In the above-described embodiment, the case where the liquid level detecting device is a sliding resistance type is exemplified, but a non-contact magnetic detecting type may be used.

  INDUSTRIAL APPLICATION This invention is suitable for the liquid level detection apparatus which detects a liquid level, and its float.

DESCRIPTION OF SYMBOLS 1 Liquid level detection apparatus 2 Rotating part 3 Electric cord F Float F1 Float F2 Float FA Float arm L Length T Height W Width

Claims (3)

A float having a specific gravity in the range of 0.16 to 0.18. The float according to claim 1, wherein the float is a closed cell foam made of nitrile rubber and a phenol resin. The float according to claim 1, wherein a part of the float is exposed from the liquid surface and floats.
A float arm having one end locked to the float and the other end connected to the rotating portion;
A liquid level detection device comprising:

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