JPH0338752Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a modification of a float switch for detecting the level of liquid.

[Conventional technology]

Industrial wastewater used in factories, etc. contains garbage, various chemicals, oil, etc., so after adding appropriate chemicals to it and separating it from the water, the oil that floats on the surface is mainly collected. upper layer (hereinafter referred to as scum)
was scraped off and stored in a scum storage tank.

Although this scum is mainly composed of oil, it also contains water, so if it is left in the scum tank, the water will separate and settle at the bottom.

This water needs to be pumped out once it reaches a certain level, and a float switch is used to control the water surface level.

This state is shown in FIG. 4. As shown in the figure, a rod 11 of a predetermined height is provided on the side surface of the submersible pump 10, and float switches 12 and 13 are attached to the upper and lower ends of the rod 11, respectively.

The internal structure of the float switches 12 and 13 is shown in FIG.
6 is used as a locking member, and its end is secured to the end of the rod 11.

The buoyancy of the float switches 12 and 13 is adjusted so that they float in water but sink in the scum 18, which has a slightly lower specific gravity.

Therefore, in FIG. 4, when the amount of water 17 increases and the water level 19 rises, the float switch 12 also rises accordingly, and the inclination angle (θ) of the float switch increases as shown in FIG. When the angle increases and exceeds a certain angle, the mercury switch 14 is activated.

When the float switch 12 is activated, the submersible pump 10 is driven to discharge water and lower the liquid level, and the lower float switch 13 is activated to stop the submersible pump 10.

[Problem that the invention attempts to solve]

However, the specific gravity of the scum 18 is similar to the specific gravity of the water 17, and there is also resistance from the cord 16, etc., so when the submersible pump 10 is activated to drain the water, the water level drops, but in this case, the float switch 13 18, the float switch 13 does not tilt as shown in FIG. 4, and therefore, the scum may also be pumped up without the mercury switch inside operating.

The present invention was devised in view of the above circumstances, and an object of the present invention is to provide a winged float switch that operates reliably even when liquids have similar specific gravity or viscosity.

[Means to solve problems]

The winged float switch according to the present invention in accordance with the above purpose includes a buoyant body that generates buoyancy by being immersed in liquid and has a locking member at one end, and detects the inclination angle of the buoyant body. A float switch having a switch that performs the above-mentioned buoyancy is constructed by providing wings on the outside of the buoyancy body.

The present invention is applicable to both cases where the switch for detecting the inclination angle of the buoyant body is disposed inside the buoyant body, or where the buoyant body and the switch are provided separately.

[Effect]

In the winged float switch according to the present invention, wings are provided on the outside of the buoyant body to increase the contact area with the liquid.

This creates resistance when the winged float switch enters the upper scum. In particular, if the upper liquid with low specific gravity has a high viscosity, this creates a large resistance and prevents the rising buoyant body from inertial entry into the upper liquid.

On the other hand, by making the overall specific gravity of the buoyant body larger than that of the upper liquid (for example, the above-mentioned scum) and lower than that of the lower liquid (for example, the above-mentioned water), it will surely float on the surface of the lower liquid.

Therefore, if the liquid level of the lower liquid falls, the buoyant body will be tilted, and a switch will be activated to detect the inclination angle of the buoyant body.

Experiments confirmed that the blades work effectively when liquids have similar specific gravity.

〔Example〕

Next, an embodiment embodying the present invention will be described with reference to the attached drawings to provide an understanding of the present invention.

FIG. 1 is a perspective view of a winged float switch according to an embodiment of the present invention, and FIG. 2 is a side view of the winged float switch according to the above embodiment.

As shown in FIGS. 1 and 2, a winged float switch 21 according to an embodiment of the present invention includes a buoyancy body 22 in which a mercury switch is inserted, and a buoyancy body 22 disposed outside the buoyancy body 22. The wing 23 and the cord 2 which is an example of a locking member that supports the buoyant body 22
4. These will be explained in detail below, but the same components as those of the conventional example are given the same reference numerals and detailed explanations will be omitted.

The buoyancy body 22 is mainly composed of styrofoam and adjustment weights, and is appropriately coated with a waterproof coating (case) around the buoyancy body 22.

On the outside of this buoyant body 22 are wings 23 having a cross-shaped cross section.
The wing 23 is made of a brass plate with a thickness of 0.35 mm, and is fixed by metal wires 25 and 26 so as to form an angle of about 90 degrees.

A cord 24 is provided at the bottom of the buoyant body 22, and the cord 24 is connected to the contacts of the mercury switch 14 to electrically send a signal indicating the conduction state of the mercury switch to the outside. .

Therefore, when using the float switch 21, lock one end of the cord 24 in a predetermined place,
When immersed in the target liquid, as the water surface 19 falls, the buoyant body 22 tends to rush into the scum 18, which has a lower specific gravity than the water, but the resistance of the wings 23 ensures that it floats on the water surface 19.

In the above embodiment, the mercury switch (it may be a switch for detecting another tilt angle) is provided inside the buoyant body, but the mercury switch is not limited to this. The present invention is also applicable to a winged float switch in which a limit switch is provided, the buoyant body and the limit switch are connected by a rod or the like, and the limit switch detects the angle of inclination of the rod.

Further, in the above embodiment, the wings are attached in a cross shape, but the present invention is also applicable to cases where the wings are attached in a ring shape, a threaded shape, or a radial shape, for example.

[Effect of idea]

As is clear from the above description, the winged float switch according to the present invention is provided with wings on the outside of the buoyant body, so it is possible to reliably detect a liquid layer surface with a similar specific gravity.

Therefore, when pumping liquids with different specific gravities,
It has become possible to reliably pump up only a portion of the liquid using a pump, etc.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a winged float switch according to an embodiment of the present invention, FIG. 2 is a side view of the winged float switch according to the above embodiment, and FIG. 3 is a sectional view of a conventional float switch. , FIG. 4 is a side view of a conventional float switch in use. Explanation of symbols, 21...Float switch with wings,
22... Buoyancy body, 23... Wings, 24... Cord (locking member).

Claims (1)

[Claims for Utility Model Registration] (1) A buoyant body that generates buoyancy by being immersed in a liquid and has a locking member at one end, and a switch that detects the inclination angle of the buoyant body. 1. A winged float switch comprising: a winged float switch, characterized in that wings are provided outside the buoyant body. (2) The winged float switch according to claim 1, wherein the switch for detecting the inclination angle of the buoyant body is disposed inside the buoyant body.