JPH0419480Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to the structure of a float that is installed in a water level observation well of a dam, river, etc. to prevent the well water surface from freezing in winter.

(Prior art) Conventionally, anti-freezing measures for water level observation wells in winter have been made up of a water level gauge 1, a detection wire 2, a water level detection float 3, a counterweight 4, and a mounting base 5, as shown in Fig. 3 as an example. In the water level observation well 6 where the float type water level gauge is installed,
A string-shaped heater 8 connected to a cable 7 was suspended up to 10 in the well water, and the cable 7 was connected to a power source 9 to heat the heater 8 and prevent the water surface 11 from freezing.

(Problem that the invention aims to solve) However, in observation wells, the heater is suspended over a relatively long section from the low water level to the high water level, so a long heater is required.
Therefore, the amount of electricity consumed to heat the heater is large, and although the heater has a waterproof structure, it is originally intended for outdoor use, so if it is heated by being immersed in water for a long period of time, the manufacturer's warranty cannot be obtained and the heater will not last long. There was a problem with sexuality.

The present invention was made to solve this problem, and it is an economical antifreeze float that floats on the water surface separately from the water level detection float, does not interfere with the water level detection function of the water level detection float. The purpose is to provide.

(Means for solving the problem) The present invention has a new configuration consisting of a pointed cylindrical float floating around a water level detection float in an observation well and a waterproof cable, and a heater is attached to the pointed cylindrical float. The structure is such that power is supplied to the heater through a waterproof cable that is built-in, penetrates the bottom of the pointed cylindrical float, connects it to the heater, and hangs a part of the middle part into the water to heat the pointed cylindrical float. This makes it possible to effectively warm the surface of the water, which tends to freeze, without hindering the water level detection float from following the water level, thus solving the above-mentioned problems.

(Example) Examples of the antifreeze float according to the present invention will be described in detail below with reference to the accompanying drawings. Fig. 1 is a partially cutaway front view of one embodiment of a water level observation well equipped with an antifreeze float according to the present invention, and Fig. 1A shows a low water level state of the water level observation well; FIG. B shows a high water level state, and the same structural parts in the conventional example shown in FIG. 3 are given the same reference numerals, and detailed explanation thereof will be omitted.

The structure of the antifreeze float 15 will be explained with the partially broken plan view, front view, and bottom view of FIGS. 2A, B, and C. The pointed cylindrical float 16 is made of, for example, an aluminum alloy material with excellent thermal conductivity. Container 17
, a vent body 19 made of a breathable sintered alloy, and an O-ring 2
0 with a plurality of fixing screws 21
The electric heater 22, which is formed by fastening with
It is connected to the. On the other hand, the waterproof cable 2 passes through the bottom of the container 17 and is connected to the terminals 23a and 23b.
4 is provided with a joint metal fitting 26 welded with a covering rubber 25, and is fastened to the bottom of the container 17 with an O-ring 27 interposed therebetween by three fixing screws 28a, 28b, and 28c.

Observation well 6 of antifreeze float 15 with the above structure
When the antifreeze float 15 hangs down while extending the waterproof cable 24, the antifreeze float 15 immediately turns half a turn in the vertical direction after landing on the water, changes direction, and floats on the water surface.

When the ventilator 19 lands on water, its outer surface is immersed in water while rotating from underwater to above the water surface.
The ventilation holes 9 are as small as approximately 60 microns, and the rotation time (immersion time) is very short, so water does not enter into the pointed cylindrical float 16. The length of the waterproof cable 24 is set to be sufficient in the low water level state shown in FIG. There is no problem in terms of durability, stability, etc.

In addition, as the water level rises, the counterweight 4 hangs down and the antifreeze float 15 floats on the water surface.
Even if they come into contact with each other, since both of them have a pointed cylindrical shape, the antifreeze float 15 is easily removed by contact between the conical slopes at the tips and does not interfere with water level measurement.

In addition, when the water level drops, antifreeze float 1
Even if the side surface of the cylindrical part of 5 is in contact with the detection wire 2, when the counterweight 4 leaves the water surface, the antifreeze float 15 is caused by contact between both conical slopes.
easily moves on the water surface and the counterweight 4
can leave the water surface without any trouble.

(Effects of the invention) As described above, according to the invention, the anti-freezing float equipped with an electric heater floats on the water surface, which warms the water near the water surface, which prevents freezing from starting from the surface of the water. It is extremely effective on the surface of the water. Further, since the antifreeze float floats separately from the water level detection float and follows the water level, it can effectively prevent freezing by warming the water surface without interfering with the water level detection function at any water level in winter. Furthermore, because the heater is built into the anti-freeze float, it consumes much less power and is functionally safer than the traditional method of suspending the heater from the edge of the well.

[Brief explanation of the drawing]

Figures 1A and 1B are partially cutaway front views of an embodiment of a water level observation well equipped with an antifreeze float according to the present invention, where A is at a low water level and B is at a low water level.
2 shows a high water level state, and FIGS. 2A and 2B are plan views showing the same antifreeze float in a partially broken state, respectively.
In the front view, C shows a bottom view, and FIG. 3 is a partially cutaway front view of an example of a conventional antifreeze method. 15... Antifreeze float, 16... Pointed cylindrical float, 17... Container, 18... Cap, 1
9... Ventilator, 20... O-ring, 21... Fixing screw, 22... Heater, 23a, 23b... Terminal, 24... Waterproof cable, 25... Covered rubber,
26...Joining metal fitting, 27...O ring, 28a,
28b, 28c...fixing screws.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a water level observation well, a hollow pointed cylindrical antifreeze float container that floats separately from a float for detecting water level, and an electric heater housed in the container. and a waterproof cable that is connected to the electric heater and suspended in water in order to supply power to the electric heater, so that the heat generated by the electric heater can be used without interfering with water level detection by the water level detection float or the like. A freeze prevention float for a water level observation well, characterized in that the water surface is prevented from freezing. (2) In claim 1 of the utility model registration claim, the float container is provided with an air permeable sintered metal on its pointed end to prevent water from entering when it lands on water, and the float container with the pointed cylindrical shape is provided with a counter top. An antifreeze float for a water level observation well, characterized in that it can be easily moved when a weight comes into contact with the droop.