JPS5856765B2 - Freeze prevention water intake float - Google Patents

Description

[Detailed Description of the Invention] The surface water of a reservoir or the like is generally higher in temperature than the bottom of the pond and is clear and does not contain sludge. It is desirable to extract surface water.

Floats used to take in surface water have recently been developed and used.

This water intake float always floats up and down in a constant relationship with the water surface in response to fluctuations in the water surface, but in harsh winter regions, ice and snow freezes on the inner and outer surfaces of this float that come into contact with water, causing the intake float to float up and down. becomes inaccurate and, in extreme cases, impossible.

This invention solves the above-mentioned disadvantages, and uses a skin current heating tube as a heat source to prevent ice and snow from forming on the water intake float or to melt the ice and snow that adheres to it.

There are various types of skin current heating tubes, but the main ones are series skin current heating tubes and induced skin current heating tubes.
It is listed on page 78, but you can easily read it here.

FIG. 1 shows a series skin current heating tube, and FIG. 2 shows an induced skin current heating tube, both of which can be used in the water intake float of the present invention.

In both figures, 1.1' is a ferromagnetic heat-generating steel pipe, and 2 is an insulated wire or cable 3 passed relatively freely through this steel pipe.
is an AC power source, usually at a commercial frequency.

4, 4', 4' are connecting wires, power supply 3 and insulated wire 2
In Fig. 1, the insulated wire 2 and steel pipe 1 are connected in series to the power supply 3, and in Fig. 2, the insulated power supply 2 is the primary circuit for the power supply 3, and the steel pipes 1 and 1' are connected to each other in series. 1゜1
' are electrically connected at both ends with shorting pieces 7 and 8, so that a secondary circuit is formed for the insulated wire 2.

In the above case, the wall thickness of the steel pipes 1 and 1' is t, the length is l, the inner diameter of the steel pipe is D, and the skin thickness representing the considerable range where the alternating current i flows through the inner skin of the steel pipe is S, and all are the same. In units of length, under conditions such as t>2S j l>D and D>S, almost no alternating current i flows out of the steel pipes 1 and 1', so there is a metallic Even if it comes into contact, it will not generate arcs or harm the human body or animals, so it can be safely used as a heat generating tube.

Conventionally, the skin current heating tube has been considered as a type of heating element as described above, but the present invention can exhibit another effect.

This is because skin current heating tubes, like transformers, are electromagnetic devices that generate electromagnetic vibrations similar to those found in transformer cores.

In other words, since the insulated wire 2 passed through the steel pipe 1 is passed relatively freely without being fixed to the center of the steel pipe, the electromagnetic force due to the fact that it is not at the magnetic center of the steel pipe 1 (in this case, the center of the steel pipe), The electric wire 2 vibrates slightly at a frequency twice the frequency of the current i.

This vibration is transmitted to the steel pipe 1 through which the electric wire 2 passes,
The skin current heating tube vibrates when energized, and is further transmitted to the discharge tube, which is the object to be heated, to prevent the formation of ice on the surface at the initial stage of freezing, or to facilitate the peeling off of the formed ice.

The mounting structure of the skin current heating tube of the above structure to the water intake float is described below.In Fig. 3, 9 is a float, which is made of a steel plate in the shape of a hollow abacus and is floated on the water surface. A cup-shaped saucer 1T with a hole in the center is attached to the side, and the surface water 11 of the pond becomes a stream 12 and flows through the gap between the float 9 and the saucer 17 to the water pipe 10.

The water pipe 10 is fixed, and the float 9 is connected by an expansion joint 15 so that it can move up and down freely.

The vertical position of the float 9 on the water surface is adjusted by water 11' introduced into the hollow part by a water injection valve 13.

Drainage of the water 11' is not shown, but requires a separate drainage pump.

Now, since the float 9 with the above structure is installed semi-indoor, it is almost never covered with snow, but during the winter in extremely cold regions, freezing of ice and snow occurs on the outside of the float, as shown in 19.
Inside, freezing occurs at the part where the foot contacts the water surface.

As a result, the weight of the float 9 fluctuates due to the freezing, and as a result, the float 9 cannot be kept floating at an appropriate depth for taking in water.

This invention solves the above-mentioned inconvenience, and in FIG. 3, the steel pipes 1, 1', etc. are the heat-generating steel pipes shown in FIG. has been done.

Figures 4 and 5 show this in detail. Figure 4 shows the shorting pieces 7 and 8, while Figure 5 shows the steel pipes 1 and 1'.
etc. are fixed to the steel plate float 9 by welding 18, so they can be omitted6.Also, in Figures 3 and 5, the surface water 11 of the pond and the water 11' inside the float are equal in water level. The height at which the float floats can be adjusted by adjusting the amount of water 11' in the float.

In Figure 3, 14 indicates the auspicious phase of the skin current heating tube.
It is omitted in FIG.

Since the float 9 moves up and down, a flexible portion 16 is required for wiring from the power source 3.

With the above-described structure and when energized, it is possible to prevent freezing 19 and 20 from occurring due to the heat generated by the skin current heating tube.

As mentioned above, the steel pipe 1.1' that constitutes the skin current heating tube
% is wound into a headband shape and is located near the outermost part of the bead-shaped float 9, so it also plays the role of mechanical reinforcement of the float 9.

In the above description, it is assumed that the float 9 is placed indoors, but if the float 9 is placed outdoors and snow is observed on the float, it is of course possible to add a skin current heating tube to this part.

The power required for freezing prevention is several hundred watts per square meter of water contact area of the float 9 for the inner surface of the float 9, but about twice that amount is required for the outer surface.

In the drawings, the steel pipes 1, 1', etc. all have circular cross-sections, but this is not a necessary condition, and depending on the installed power capacity, three-phase instead of single-phase can be used.

[Brief explanation of drawings]

Figure 1 is a principle diagram of a series skin current heating tube, Figure 2 is a principle diagram of an induced skin current heating tube, Figure 3 is a longitudinal sectional view of the antifreeze float of this invention, and Figure 4 is a diagram of an induced skin current heating tube. FIG. 5 is a perspective view showing the relationship between the float steel plate, and a vertical sectional view showing the relationship between the float to which the skin current heating tube is attached and the water surface. i, i': ferromagnetic heat-generating steel pipe, 2: insulated wire, 3:
AC power supply, 4, 4', 4': Connection wire, 5, 6: Terminal,
7, 8: Short circuit piece, 9: Float, 10: Water pipe, 13:
Water injection valve, 14: Water phase, 15: Expansion joint, 16: Flexible wiring, 1T: Receiver, 18: Welding.

Claims (1)

[Claims] 1. A skin current heating tube with an insulated wire passed through relatively freely without being fixed to the center of the steel tube in a headband shape on the inner or outer surface of the part in contact with the water surface of a steel plate float for surface water intake such as a reservoir. The required number of turns is a welded antifreeze water intake float.