JPS5827459Y2 - float switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a float switch for detecting two liquid levels when a conductive liquid (for example, water) and an insulating liquid (for example, oil) coexist in a tank.

Conventional floats of this kind have a structure in which two floats with different specific gravity are attached to a guide member, but they have many parts and are expensive, and because they rely on the buoyancy of the floats, it is difficult to achieve high operating accuracy. There were drawbacks.

The present invention solves this conventional drawback, and an embodiment thereof will be described in detail below with reference to the accompanying drawings.

Figure 1 shows a partially cutaway float switch according to the present invention, in which 1 is a reed switch 2, which is a magnetic sensing element.
3 is a float equipped with a magnet 4 for driving the reed switch 2; 5 is a top plate of a tank containing water 6, which is a conductive liquid, and oil 7, which is an insulating liquid; It is.

8 is a pair of electrode rods embedded in the float guide member 1 so that both ends are exposed; one end 9 detects the water level of the water 6;
The other end 10 serves as its output terminal.

This float switch is installed in the tank upright on the top plate 5, and the float 3 moves up and down as the water level of the oil 7 fluctuates, thereby turning the reed switch 2 on and off.
FF l, is detected.

Further, when the water level of the water 6 moves up and down due to fluctuations in the oil 7, this is detected when the water surface of the sample water 6 comes into contact with the ends 9 of the pair of electrode rods 8.

FIG. 2 is a schematic diagram showing an example of the formation of the float guide member 1, in which a lead frame 11 is punched out from a metal plate in the shape of a blind.
The lead parts 12 of the lead frame 11 are inserted into a set of two, and a large number of float guide members 1 with the lead parts 12 embedded therein are connected and manufactured, and then the frame part 13 is assembled. By cutting it out, it can be easily obtained in mass production.

As described above, the present invention has remarkable practical effects, such as having fewer parts and lower costs than the conventional two-float type, as well as providing high operating precision.

In the above embodiment, two electrode rods were used, but if the float guide member is made of a metal body, one electrode rod can be inserted into the float guide member with insulation. The electrode rod and the float guide member may constitute a pair of conductive liquid detection electrode means.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway view showing a float switch according to the present invention, and FIG. 2 is a schematic diagram showing an example of the formation of a float guide member according to the present invention. Explanation of symbols 1... Float guide member, 2...
...Magnetic sensing element, 3...Float, 4...
... Magnet, 6... Conductive liquid, 7...
...Insulating liquid, 8... Electrode rod.

Claims (1)

[Scope of utility model registration request] A float guide member that accommodates a magnetically sensitive element such as a node switch or a Hall element, and a float equipped with a magnet for driving the magnetically sensitive element are provided, and the float guides the float guide member according to changes in water level. In a float switch that moves up and down as a float switch, an electrode rod is embedded in the float guide member so that both ends thereof are exposed, one end of the electrode rod is made contactable with a conductive liquid, and the other end is used as an electrode output terminal. A float switch characterized in that the electrode rod detects a liquid level different from that of the float.