JPS5854680Y2 - Float for liquid level gauge - Google Patents

Description

[Detailed explanation of the invention] Conventional liquid level gauge floats are made by forming a corrosion-resistant synthetic resin film on the surface of a stainless steel container to provide pressure resistance and corrosion resistance, but since the container is made of metal, it is heavy and It is not suitable for measuring the level of liquids with low specific gravity, and if the type has a built-in magnetic tracking type magnet, it will require high heat when coating the synthetic resin material, and this heat will demagnetize the magnet. There are drawbacks.

Furthermore, some magnets use rare earth elements with strong magnetic force, but because these rare earth magnets have a low curie point, conventional magnets are demagnetized during high-temperature coating, especially those with small floats for low specific gravity. Because of their small heat capacity, rare earth magnets lose most of their magnetic ability, making it impossible to use rare earth magnets in small floats.

A hollow container made of non-magnetic material whose opening ends are closed with caps 3 made of tetrafluoroethylene is provided, and a thin-walled large-diameter portion 5a is placed inside the joint.
, 5b are formed on the upper and lower divided bodies 2a.

2b, and a ring 6 made of non-magnetic material is provided around the outer periphery of the magnet 7, but flux guiding plates 8a made of magnetic material are provided on both upper and lower surfaces of the magnet 7.
, 8b is sandwiched between the thin, large-diameter parts of the upper and lower divided bodies, and the joints of the upper and lower divided bodies are welded from the outside 9.
In addition, an outer cylinder 1 made of tetrafluoroethylene is provided on the outside of a hollow container made of a non-magnetic material.

The float of the present invention described above is as shown in FIG.
The flow (c) in the vertical metal side pipe whose upper and lower parts communicate with the inside of the tank a moves up and down as the liquid level in the tank a fluctuates, causing the vertical guide d outside the side pipe to rise and fall. The sphere (e) made of a magnetic material inside is used as a float for a liquid level gauge configured to be moved up and down following the flow (c) by magnetic coupling.

However, in the present invention, the body of the float is constructed with double inner and outer tubes, and since both the inner and outer tubes are made of synthetic resin, they are lighter than conventional ones that use metal tubes, and have a low specific gravity. It can also be used to measure liquids.

Furthermore, the outer cylinder 1 is made of tetrafluoroethylene, so it has excellent corrosion resistance, and the inner cylinder is made of vinyl chloride, so it has excellent strength, corrosion resistance, and pressure resistance, making it suitable for various types of floats. Can be used with liquids without any problems.

Furthermore, since the outer cylinder 1 is structured to be fitted into the inner cylinder 2, if the built-in magnet type is used, it is only necessary to attach the magnet to the inner cylinder and then fit the outer cylinder into the inner cylinder, and there is no need to heat the outer cylinder. do not have.

Further, although the upper and lower divided bodies are welded at their joints, since a ring 6 made of a non-magnetic material is provided around the outer periphery of the magnet 7, the influence on the magnet during welding can be minimized.

Therefore, it is possible to use a rare earth magnet that has a low Curie point and is demagnetized by heat, and it is small and lightweight but has a large magnetic force, that is, it can be used for low specific gravity applications, and the float allows the magnetic follower to respond faithfully. can be provided.

Further, flux guiding plates 8 a and 8 are provided on the upper and lower surfaces of the magnet 7.
b is provided, the magnetic field is formed only on the outer peripheral sides of the guide plates 8 a and 8 b as shown by broken lines in FIG. 2, and a magnetically coupled float with a large effective flux can be obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the liquid level measuring device, FIG. 2 is a longitudinal sectional view of the float, and FIG. 3 is a partially enlarged longitudinal sectional view. In the figure, 1... Outer cylinder, 2... Inner cylinder, 3...
...Cap, 4...O ring, 5a,
5b...Large diameter part, 6...Nonmagnetic material part,
7... Magnet, 8 a, 8 b... Flux guide plate, 9... Welded part.

Claims (1)

[Scope of utility model registration request] It consists of a hollow container made of non-magnetic material whose opening ends are closed with caps made of tetrafluoroethylene, and an upper and lower divided body with a thin-walled large-diameter part formed inside the joint, and a magnet made of non-magnetic material around the outer periphery of the magnet. The outer periphery of a magnet body provided with flux guide plates made of magnetic material on both the upper and lower surfaces of the ring-equipped body is sandwiched between the thin, large-diameter parts of the upper and lower divided bodies, and the joints of the upper and lower divided bodies are welded from the outside, and A float for a liquid level gauge consisting of a hollow container made of non-magnetic material and an outer cylinder made of tetrafluoroethylene.