JPH0317227Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a heater for preventing freezing of the water surface inside a breakwater pipe, which prevents the water surface inside the breakwater pipe from freezing in winter and accurately measures the water level.

"Prior Art" In order to measure the liquid level inside a dam, lake, water tank, large tank, etc., a pressure sensor 13 is installed deep in a breakwater pipe 21 as shown in Fig. 5. The cable 10 is connected to an external water level indicator 14 to transmit a signal.

Since this breakwater is connected to the outside near the bottom of the dam, etc., the water level inside this breakwater is equal to the water level in the dam, etc., and the water surface L due to the influence of waves is Disturbance (vertical movement) can be prevented.

However, in winter, the water surface freezes, making it impossible to accurately measure the water level. Therefore, the movable part A of the water surface in the wavebreak tube, that is, the part of the wavebreak tube in which the water surface L can normally move up and down, is constructed in a double structure to form an accommodation chamber 22 inside, and a heater 23 is installed in this accommodation chamber. It is installed. In this conventional method, the heater 23 needs to be arranged over a wide range over a considerable length in anticipation of the amount of water level change, so the heating device such as the heater 23 becomes large-scale. In addition to being large in size, it also had the drawback of consuming excess power because current was constantly being applied to the entire heater. Moreover, since the heater 23 uses an indirect heating method in which heat is generated from the outside of the breakwater tube 21, the power loss is large and it is extremely uneconomical.

``Problems that the invention attempts to solve'' This invention was made in view of the above-mentioned drawbacks.The heater is float-type and floats on the water surface, directly heating the area near the water surface that is prone to freezing. The problem is to be able to accurately measure water levels without using electricity.

``Means for solving the problem'' The present invention communicates the liquid inside the cylindrical breakwater pipe with the outside liquid, and installs a pressure sensor of a water level gauge inside the breakwater pipe, so that the liquid level changes as the liquid level moves. The above-mentioned problem is solved by floating a float equipped with a heater on the liquid surface in the breakwater tube so as to move up and down to prevent the liquid surface from freezing.

``Function'' Since the heater is a float type, even if the water surface moves up or down, it directly heats only the area near the water surface to prevent freezing, which reduces power consumption.

``Example'' 1 is a cylindrical breakwater pipe that communicates with the outside at approximately the bottom of a dam, lake, water tank, large tank, etc., so the liquid level inside the breakwater is always the same as the outside. . Annular upper and lower mounting parts 3 and 4 are attached to the upper and lower parts of the wavebreak pipe 1, respectively, and a guide punch 5 is attached to these upper and lower mounting parts 3 and 4. Reference numeral 7 denotes an annular float housed in the breakwater tube 1 so as to be able to move up and down, and has a known heater 8 built therein and is floated on the liquid surface. 9 is an opening provided in the center of this float 7;
A heater lead wire 11 for energizing the guide punch 5, the water level gauge cable 10, and the heater 8 attached to the float 7 is inserted inside. In addition, the pressure sensor 13 attached to the lower end of the water level gauge cable 10 is set at a deep position in the breakwater pipe 1.
Furthermore, since the float 7 heats only the vicinity of the water surface inside the breakwater pipe 1, it is significantly shorter than the breakwater pipe, and therefore, the float 7
The amount of heat generated by the heater installed is also small. Moreover, the other end of this cable 10 is connected to an external water level indicator 14.

In addition, a thermostat 12 is installed inside the heater 8, between the heater 8 and the heater lead wire 11, or at a desired location on the heater lead wire 11, and the heater 7 is turned on only when the water temperature drops below a certain temperature. Of course, it is also possible to allow current to flow.

Although the liquid in this embodiment is mainly water, it is not necessarily limited to that.

Next, to explain the operation of this embodiment in the case of measuring the water level of a dam, the water surface of the dam freezes in winter, but in this device, the water surface inside the breakwater pipe 1 is heated. Since the float 7 with a 8 is floating, heating the heater efficiently heats only the water surface area to prevent freezing, and the water level inside the breakwater is measured by the pressure sensor 13 of the water level gauge. Can be measured accurately.
In this case, even if the water surface inside the breakwater pipe 1 moves up and down and its height changes, the float 7 always floats on the water surface and moves along with the movement of the water surface, so the heater 8 inside the float By heating the water surface, which is most likely to freeze, the vicinity of the water surface, which is most likely to freeze, can be directly heated instead of from the outside of the breakwater tube 1, so the amount of heat generated by the heater 8 can be significantly smaller than that of conventional heaters.

Here, for example, while the conventional heater power shown in FIG. 4 requires 1500W, the
The heater power shown in Figure 3 can achieve the same effect with 300W, and has the advantage of requiring about 1/5 of that power.

In addition, FIG. 5 shows another embodiment, in which when the guide punch 5 is inserted into the guide hole 7a provided in the vertical direction of the float 7, rotation of the float 7 is prevented and the heater lead wire is 11 can be prevented from breaking.

"Effects of the invention" The invention as described above has the following effects.

Since the heater is a float type that floats on the water surface, it only needs to heat the minimum necessary area, which reduces power consumption.

This float is located inside the breakwater pipe and directly heats the liquid on the water surface, so it has extremely high thermal efficiency and can reduce power consumption and save energy resources.

Since the structure is simple, the float can be made smaller and lighter, and the entire device can be made smaller.

The heater is attached to a float, which floats on the water surface, so it can automatically move up and down as the water surface moves up and down, and it only heats the water surface area that is prone to freezing, making efficient use of electricity. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a longitudinal cross-sectional view of the whole with some parts omitted, Fig. 2 is a plan view of the same, and Fig. 3 is a longitudinal cross-section of the whole showing the second embodiment. 4 is a plan view of the main part of the third embodiment, and FIG. 5 is a longitudinal sectional view of the conventional one. 1...Breakproof tube, 7...Float, 8...Heater, 10
...Cable for water level gauge.

Claims (1)

[Scope of utility model registration request] The liquid inside the cylindrical breakwater pipe communicates with the liquid outside. A pressure sensor for a water level gauge is installed inside the breakwater pipe, and a float equipped with a heater is installed to move up and down as the liquid level moves. A water surface freeze prevention heater for a water level gauge, characterized in that it floats on the liquid surface in the breakwater pipe to prevent the liquid surface portion from freezing.