JP2853191B2 - Heat pipe operation test method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to an operation test method for testing whether or not a heat pipe operates normally, and more particularly to an operation test method attached to a branch of a power pole or installed on a steel tower member. Then, by burying one end side of the heat pipe in the ground, the ground heat is collected, and the heat is transferred to a radiating portion on the ground to radiate heat, thereby melting the snow around the branch line and the tower member. Further, the present invention relates to an operation test method for efficiently detecting whether or not a heat pipe provided to protect a branch line or a tower member from a large sinking force of snow is normal.

[Prior Art] A utility pole is usually provided with a branch line to prevent the collapse of the utility pole. However, when the amount of snow in a snowfall area increases, the utility pole is inclined or the branch line is disconnected. There is.

On the other hand, overhead power transmission lines that transport large amounts of power over long distances often pass through harsh mountainous areas with severe weather conditions as the location of power sources becomes more severe. There is a great deal of snowfall in the snowfall area, and protecting tower members from damage caused by this snowfall has become a major issue.

That is, the snow layer that has fallen around the telephone pole or the tower gradually sinks, and a phenomenon occurs in which so-called snow compacts. At this time, a large downward force is applied to the branch line and the tower member buried in the snow due to the sedimentation force, and depending on the amount of snow at that time, depending on the case, to reach about 1,000 kg,
It can cause damage to branch lines and tower members.

For this reason, the branch line of the telephone pole and the like prevent the occurrence of an accident due to the sedimentation force by removing snow around the branch line every time there is snowfall, but it requires a great deal of labor, time and cost. I need it.

In the case of telephone poles, even if snow can be removed by the above-mentioned input, it is no longer possible or even impossible for a steel tower on a steep terrain.

Therefore, as shown in FIG. 3, a branch heat wire with a heat pipe attached near the snow level of the branch line 21 of the utility pole 20 is provided.
1A or as shown in FIG. 4, a heat pipe 1B for melting the tower is installed near the snow height of the tower 30, and the snow around the heat pipe is melted and cut off, and the settling force of the snow is cut off. The snow damage prevention device has been put to practical use.

That is, one end of the heat pipe is buried in the ground as shown in the figure to form a heat collecting section, and the other end side is used as a heat radiating section by attaching to a branch line or a steel tower member as shown in the figure.

The heat pipe consists of a pipe-shaped hermetically sealed container, in which a working fluid capable of evaporating and condensing is enclosed.The working fluid absorbs geothermal heat in the underground heat collecting part and evaporates. , Where it is condensed and liquefied, returned to the heat collecting section and evaporated again. When the steam is condensed in the heat radiating portion, heat is released, and the snow around the branch line and the tower member is melted.

Install the branch wire heat wire 1A or the tower heat melting pipe 1B, and if it operates normally, the snow melting will be performed.However, if the heat pipe is damaged, it will not operate properly, and the expected snow melting will be performed. Can not.

However, whether or not the heat pipe operates normally cannot be simply determined by the appearance.

Further, the work of mounting the heat pipe is usually performed in a season where the outside temperature is high and there is no snowfall, and the operation of the heat pipe itself does not occur in a state where the outside temperature is higher than underground.

Therefore, conventionally, an operation test was performed to determine whether or not the heat pipe installed using the method shown in FIGS. 3 and 4 operates normally.

In other words, a dummy wire 1A 'having the same structure as that of the branch wire heat wire 1A, in which no working fluid is sealed, is prepared, and a working fluid is sealed in the steel tower snow melting heat pipe 1B. While a dummy pipe 1B 'having no structure is prepared, a thermocouple 4, a generator 5, a temperature recorder 6, copper blocks 8, 8', and a low-temperature thermostat 9 shown in the figure are prepared.

In the experiment, first, the copper blocks 8, 8 'were put into the low-temperature constant temperature bath 9 to be sufficiently cooled, and the cooled copper blocks were cooled.
8, 8 'to the actual wire 1A and the dummy wire 1A', respectively, or the actual pipe 1B and the dummy pipe 1B 'as shown in the figure.
, And simultaneously cooled using cooling copper blocks 8, 8 '. Thermocouples 4 and 4 are attached to the cooled positions, and the temperature recorder 6 records the temperature changes over time, and measures the time until the temperature returns to the normal temperature.

As a result, the copper block 8 attached to the branch wire heat wire 1A or the tower snow melting heat pipe 1B is a dummy product.
If the temperature returns to the room temperature earlier than the copper block 8 'attached to 1A', 1B ', it is cooled by the copper block 8 and the heat pipe starts to operate. 8 is determined to be heated earlier than the copper block 8 'on the dummy product side, and the operation is determined to be normal. Otherwise, the operation is determined to be defective.

[Problems to be Solved by the Invention] In principle, it should be possible to determine the normal operation of the heat pipe by the above-mentioned conventional method. However, in practice, it is not always a sufficient test method. It is often difficult to determine whether the operation is normal. That is, the copper block 8 attached to the branch wire heat wire 1A or the tower snow melting heat pipe 1B and the dummy product
The difference in the time for the temperature recovery of the copper block 8 'attached to 1A' and 1B 'is not so clear. For example, in the laboratory, the time required for the temperature of the copper block for the heat pipe for melting snow from the tower to the temperature of 10 ° C. lower than the outside temperature to 2 ° C. lower than the outside temperature was examined. Copper block 8 is 3-5 minutes, dummy product 1B '
It takes 7 to 10 minutes for the copper block 8 'attached to the device. However, if the influence of the outside air temperature, wind, sunlight or the like at the time of measurement is added to this, a large variation occurs.

The next problem is that it takes time. First, it takes a considerable time for the low-temperature constant-temperature bath 9 for cooling the copper blocks 8, 8 'to cool. Further, it is troublesome that the copper blocks 8, 8 'must be cooled after each test.

Third, the equipment for the test is large. A large generator such as a generator 5, a temperature recorder 6, a low-temperature constant-temperature bath 9, and the like are required. If it can be transported by car, it will not be much of a problem, but heat pipes for snow melting towers are not only accessible by car, but rather on mountains that can not be reached by car. In such a case, transporting the necessary equipment requires great effort.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems of the prior art, and to clearly determine the presence or absence of a normal operation of a heat pipe, complete a test in a short time, and perform a heavy test. An object of the present invention is to provide a new heat pipe operation test method capable of minimizing the loading of equipment.

[Means for Solving the Problems] The present invention provides a snow melting apparatus configured to attach a heat pipe and use the geothermal heat to melt snow, and a heater is added to the underground heat collecting portion of the heat pipe, By heating the heat collecting portion of the heat pipe to a temperature higher than the outside air temperature on the ground by the heater, a temperature change in the heat radiating portion on the ground is detected, and it is determined whether or not the operation of the heat pipe is normal.

[Action] If a heater is attached to the heat collecting part to forcibly heat the heat collecting part so that the temperature becomes higher than the heat radiating part, if the operation of the heat pipe is normal, heat is collected to the heat radiating part side. Heat transfer from the side of the unit occurs, and the temperature rises in the radiator. However, if the heat pipe is defective, the temperature rise in the radiator does not occur.
Since the measurement of the presence or absence of the temperature rise can be clearly detected, it can be determined with high reliability whether the operation is normal.

[Example] Hereinafter, the present invention will be described with reference to examples.

FIG. 1 is a diagram showing a situation in which a test method according to the present invention is applied to a branch wire heat wire 1A, and FIG. FIG.

In the present invention, when the heat wire 1A or the heat pipe 1B is buried in the ground, an appropriate simple heater 2 is simultaneously attached and embedded in the outer peripheral position of the heat collecting portion, and the heater 2 So that the heat collecting section can be heated.

In each of the figures, reference numeral 7 denotes an electrical connection portion such as a terminal piece, but usually has only one end of the connection terminal, and when necessary, a lead wire from the measurement equipment side, for example, from a temperature control sliderac 3. In such a way that electrical continuity can be obtained.

The heater 2 only needs to be able to heat the heat collecting section to a required temperature. If it is only used to check the normal operation of the heat pipe when it is installed, there is no need to consider corrosion resistance in particular, but in the present invention, it is rather meaningful to have a function for periodic inspection. In such a case, it is necessary to use a material that can maintain corrosion resistance in the ground for many months.

Regarding the structure of the heater 2, it does not matter whether it is vertically attached as shown in FIG. 1 or wound and installed as shown in FIG. 2. There is no particular limitation on the material and shape of the sheet heating element that is receiving attention.

In the operation test, the lead wire of the heater and the lead wire of the temperature control slider 3 were connected to the connection portion 7 described above.
And the heater 2 is heated by connecting to the generator 5. Then, the temperature of the ground portion of the branch wire heater wire 1A or the tower snow melting heat pipe 1B is measured by the thermocouple 4 and recorded on the temperature recorder 6. By this measurement, the temperature before heating by the heater 2 is compared with the temperature after heating,
If the temperature of the branch wire heat wire 1A or the tower snow melting heat pipe 1B rises after heating, the operation as a heat pipe is normal as described above. Can be determined.

In addition, the result can be obtained in a short time by a simple operation of simply connecting the lead wire at the connection portion and starting the generator. The efficiency improvement effect is quite remarkable. Furthermore, there is a great difference in the measurement accuracy, and the effect of improving the reliability is also remarkable.

Although the temperature recorder 6 is used as a temperature measuring device in the embodiment shown in FIGS. 1 and 2, it is not necessary to use a temperature recorder, and a contact surface temperature measuring device or an infrared temperature measuring device may be used. Since it can be used, the weight and the number of devices to be carried in can be reduced, and there is an advantage that measurement in mountainous areas and the like can be greatly facilitated.

[Effects of the Invention] As described above, according to the operation test method of the present invention, the following excellent effects can be exhibited.

(1) It is sufficient to measure the temperature change itself instead of measuring the time during which the temperature changes as in the conventional example. Therefore, it is possible to easily, quickly, and surely determine the operation of the heat pipe.

(2) Since it is not necessary to cool the copper block, the time required for cooling can be shortened, and a low-temperature constant-temperature bath is not required, so that equipment to be transported to the site can be reduced.

(3) If a contact type surface temperature measuring device or an infrared temperature measuring device is used for the temperature measurement instead of the temperature recorder, the necessary equipment can be further compacted.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state in which the present invention is applied to a heat wire for branch lines, FIG. 2 is an explanatory view showing a state in which the present invention is applied to a heat pipe for tower melting, and FIGS. 3 and 4 are explanatory views each showing a conventional operation test method. It is. 1A: Heat wire for branch line, 1B: Heat pipe for tower snow melting, 2: Heater, 3: Slidac for temperature control, 4: Thermocouple, 5: Generator, 6: Temperature recorder, 7: Connection, 20: Telegraph pole , 30: Tower.

Continuation of the front page (56) References JP-A-57-86736 (JP, A) JP-A-63-315889 (JP, A) JP-A-57-210291 (JP, A) (58) Fields investigated (Int .Cl. ⁶ , DB name) G01M 19/00 F28D 15/02

Claims (1)

(57) [Claims] 1. A snow melting apparatus in which a heat pipe is attached to melt snow using geothermal heat, wherein a heater is preliminarily buried on the outer periphery of the underground heat collecting portion of the heat pipe. If necessary, the heater heats the heat collecting portion of the heat pipe to a temperature higher than the outside air temperature on the ground, detects a temperature change before and after the heating in the heat radiating portion of the heat pipe on the ground, and determines whether the operation of the heat pipe is normal. An operation test method for a heat pipe that determines whether or not there is a heat pipe.