JP3301632B2 - Parabolic antenna snow melting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parabolic antenna snow melting apparatus used for satellite communication.

[0002]

2. Description of the Related Art In recent years, the use of satellite broadcasting and communication satellites in which satellite stations and ground stations are connected by microwave communication has begun to spread, and large-scale information has been obtained to obtain clear image and sound information during television broadcasting and disaster prevention. A parabolic antenna reflector is provided.

However, there is a problem in a cold region or a snowy region where microwaves are attenuated due to snowfall or icing, making it difficult to obtain clear image and sound information.

In order to solve this kind of problem, for example, a closed space formed by an antenna reflector and a heat insulating material is provided with a plurality of hot air generators and is heated by the principle of convection.
JP-A-30863, JP-A-63-90204, in which the rear surface of an antenna reflector is heated by means of an electric heater provided at a predetermined distance away from the surface of an antenna reflector, and a planar heating element is provided on the rear surface of the antenna reflector. Japanese Utility Model Publication No. Hei 3-2968 proposes a method in which a heating wire is provided in a space where no planar heating element is disposed and heating is performed by the principle of conduction.

[0005]

However, the method of heating with a plurality of hot air generators as disclosed in JP-A-2-30863 has the following disadvantages.

Because of the convection method, the conduction efficiency is poor, and a high temperature of 80 ° C. or more is required to ensure the snow melting performance. Clear images cannot be obtained or power consumption is large.

[0007] The waterproof structure when rainwater leaks is difficult,
There is a risk of electric leakage and electric shock.

[0008] It is difficult to take measures against corrosion such as salt damage and sulfur dioxide gas, so that the durability life is inferior. If used for a long time, the operating part is liable to break down, and maintenance and inspection become complicated.

[0009] The structure for mounting the hot air generator is complicated, and the snow melting device becomes expensive.

Japanese Patent Application Laid-Open No. 63-90204 has excellent conduction efficiency due to the radiation system, but has the following disadvantages.

[0011] In the radiation method, the temperature around the antenna reflector becomes low, and snow melting cannot be completely performed when environmental conditions are poor.

Since the heat capacity of the back shell is large, it takes time until the surface of the heater is heated to a high temperature of 70 ° C. or more. For example, it is not possible to detect snow with a snowfall sensor and turn on the heater as necessary. Electricity is used and power consumption increases.

In order to ensure the snow melting performance, the surface temperature of the heater provided on the back shell must be as high as about 70 ° C. or more. Therefore, the heat insulating material for reducing the heat loss must be thickened. The back shell becomes large, and handling and inspection during and after installation becomes difficult.

Next, Japanese Utility Model Publication No. 3-2968 does not have the above-mentioned disadvantages, but has the following disadvantages.

The rear surface of the antenna reflector is formed of a parabolic curved surface, and it is difficult for a flat sheet-like sheet heating element to adhere to the rear surface of the antenna reflector in close contact with the surface of the antenna reflector. Inferior in snow melting performance.

Since the heating wire is merely laid in the space where the planar heating element is not arranged, unevenness between the laying of the heating wire and the heat-generating portion tends to occur, and the snow melting performance cannot be sufficiently exhibited.

It takes time to lay the heating wire, and the laying variation between products is likely to occur.

[0018]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention solves the above-mentioned problem by providing a parabolic reflector with a heater wire and a heat insulating material laminated one after another and covering with a back shell. In the apparatus, the heater wire is pre-fused and fixed to a metal foil and adhered to the back surface of a parabolic reflector, the heater wire and the surface of the metal foil are covered with a heat insulating material, and the back shell is provided on the back shell. The heat insulating material is covered by using the outer peripheral end of the parabolic reflector so as to be fixed to the heater wire so as to be in close contact therewith.

In the above configuration, in the case of an offset parabolic antenna, a metal foil formed by welding and fixing a heater wire may be attached to a lower half of the back surface of the parabolic reflector.

Further, power is supplied to the heater wire at a predetermined temperature.
A configuration in which a temperature sensor for N / OFF is provided between the wirings of the heater wire, a snowfall sensor for sensing snowfall and turning on / off a power supply to the heater wire at a predetermined temperature, and the outside air temperature is reduced by the snowfall sensor. The above problem can be solved by providing a method of controlling to the OFF mode for snowfall at a low temperature exceeding the snow melting ability of the heater wire.

[0021]

The following operation can be expected by adopting the above configuration.

The reflecting surface of the parabolic reflecting mirror can be uniformly heated at a temperature of 50 ° C. or less, and has excellent rapid heating properties.

The waterproof structure can be easily formed, and the corrosion resistance is excellent.

Low power consumption and low cost.

The structure is compact and easy to stick.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a parabolic antenna snow melting apparatus according to an embodiment of the present invention, and FIG. 2 shows another embodiment in which a snow melting apparatus is provided in a lower half of a parabolic reflector. A built-in parabolic reflector made of FRP, 2 is a heater wire which is previously welded and fixed to a metal foil 3 and is adhered to the back of the parabolic reflector 1, 4 is a heater wire covering the surface of the heater wire 2 and the metal foil 3. Thermal insulation material provided by lamination, 5 is parabolic reflector 1
Is a back shell provided on the back surface of the parabolic reflector 1 using the outer peripheral end of the back shell. The back shell 5 is provided with a projection 6 on the back side of the parabolic reflector 1 so that the heat insulating material 4 is in close contact with the heater wire 2.

Reference numeral 7 denotes a temperature sensor for detecting the temperature of the heater wire 2 provided between the wirings of the heater wire 2 which is welded and fixed to the surface of the metal foil 3 in a meandering manner, and 8 is provided outside the parabolic reflector 1. This is a snowfall sensor that detects the presence or absence of snowfall and turns on / off the current flowing through the heater wire 2.

Next, the operation of the present invention having the above configuration will be described.

When snowfall is detected by the snowfall sensor 8,
Power is supplied to the heater wire 2, the heater wire 2 generates heat and the metal foil 3
As a result, the heat is made uniform, the surface of the parabolic reflector 1 is warmed, and the snow on the front of the parabolic reflector 1 is melted.

As the heater wire 2, for example, a so-called cord heater having a structure in which a heating wire made of a copper alloy is spirally wound around a core yarn of heat-resistant fiber, and an insulating coating layer of heat-resistant vinyl chloride is provided around those wires. A heater wire of this type has a waterproof structure that is easy, has no danger of electric shock, is excellent in corrosion resistance, and is excellent in long-term reliability.

The metal foil 3 is provided on the surface of an aluminum foil having a thickness of 50 to 100 μm with a welding layer made of vinyl chloride, acrylic, polyester or the like which can be welded to the insulating coating layer of the heater wire 2. It is fixed by welding in advance.

If a pressure-sensitive adhesive is provided on the side opposite to the surface of the metal foil 3 to which the heater wire 2 is fixed, the metal foil 3 with the heater wire 2 can be easily placed on the back of the parabolic reflector 1. Can be stuck.

The heat insulating material 4 has the function of preventing heat conduction in the direction of the back shell 5 provided on the back of the parabolic reflector 1 and increasing the efficiency of heating the parabolic reflector 1. The back shell 5 is drawn so that the convex portion 6 is directed toward the parabolic reflecting mirror 1, so that the heat insulating material 4 is in close contact with the heater wire 2, and the role of suppressing the loss of convective heat is obtained.
And the heat insulating material 4 are protected from the outside air environment such as rain and solar radiation.

The temperature sensor 7 detects an excessive rise in temperature by fixing the heater wire 2 with a metal foil with an adhesive between the wires, and the temperature of the heater wire 2 becomes 50 to 60 ° C. In this case, the power supply to the heater wire 2 is stopped, and when the temperature becomes low, the power supply to the heater wire 2 is performed again. The temperature sensor 7 is, for example, a thermostat. If a temperature fuse that blows at 70 to 80 ° C. higher than the operating temperature of the thermostat is provided, the safety is further improved.

The snowfall sensor 8 detects the snowfall and supplies power to the heater wire 2, and controls to stop the power supply to the heater wire 2 after a certain period of time after the snowfall stops. In addition, for snowfall in the case where the outside air temperature is too low, the experimental results indicate that stopping the operation of the snow melting apparatus has less adverse effect on the antenna performance. For example, the outside air temperature is -6 to -10C.
When the temperature becomes near, the power supply to the heater wire 2 is stopped.

Next, in the case of an offset parabolic antenna, since the parabolic reflector 1 is installed at an elevation angle of 3 ° to 27 ° with respect to the satellite, the snow on the reflecting surface is about the lower half surface. Confirmed from. Then, when the snow melting apparatus of the present invention was mounted on the lower half surface of the parabolic reflecting mirror 1 and a snow melting experiment was performed, it was found that the antenna performance was sufficiently secured without snow on the reflecting surface. This means that the heater wire 2 welded to the metal foil 3 is formed on the lower half of the parabolic reflector 1.
And the heat insulating material 4 are sequentially laminated, and their back surfaces are attached by the back shell 5, so that a sufficient function as a snow melting device can be provided and power consumption can be reduced.

[0038]

As described in detail above, according to the parabolic antenna snow melting apparatus of the present invention, since the parabolic reflector is directly heated, the heating rate is excellent and the power consumption is small.

Further, since the heater wire is welded and fixed to the metal foil and adhered to the parabolic reflector, uniform heating can be performed and snow melting performance is excellent.

Further, since the waterproof structure can be provided, there is no fear of electric shock, corrosion resistance, excellent durability life, compactness and good sticking property can be realized at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of an essential part of a parabolic antenna snow melting apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a parabolic antenna snow melting apparatus according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Parabolic reflector 2 Heater wire 3 Metal foil 4 Insulation material 5 Back shell 6 Convex part 7 Temperature sensor 8 Snowfall sensor

──────────────────────────────────────────────────続 き Continued from the front page (72) Koji Sakauchi, Inventor 1406, Hasunuma, Omiya City, Saitama Prefecture (72) Hiroaki Ohata, 1406, Hasunuma, Omiya City, Saitama Prefecture Examiner, Yagi Antenna Co. Katsunori (56) References JP-A-63-90204 (JP, A) JP-A-2-97101 (JP, A) JP-A-1-254003 (JP, A) JP-A-5-327327 (JP, A) JP-A-62-219702 (JP, A) JP-A-62-31393 (JP, U) JP-A-61-93007 (JP, U) JP-A-63-192707 (JP, U) JP-A-62-39311 (JP, U) Actually open 1987-21105 (JP, U) Actually open, 64-54406 (JP, U) Actually open, 57-106302 (JP, U) Actually open, 63-72909 (JP, U) Actually open Showa 61-104607 (JP, U) Actually open Showa 60-85404 (JP, U) Actually open 59-95730 (JP, U) (58 ) investigated the field (Int.Cl. ^7, DB name) H01Q 15/16 H01Q 1/02

Claims (1)

(57) [Claims] 1. A parabolic antenna snow melting apparatus comprising: a heater wire (2) and a heat insulating material (4) laminated on a back surface of a parabolic reflector (1) and covered by a back shell (5). The wire (2) is welded and fixed to the metal foil (3) in advance and attached to the back of the parabolic reflector (1), and the surfaces of the heater wire (2) and the metal foil (3) are covered with a heat insulating material (4). The outer periphery of the parabolic reflector (1) such that the heat insulating material (4) is fixed to the heater wire (2) in close contact with the convex portion (6) provided on the back shell (5). Cover using the end, and supply power to the heater wire (2) at a predetermined temperature.
Turn on / off the temperature sensor (7) with the heater wire
In addition to the space between (2) wiring,
For turning on / off the power supply to the power line (2) at a predetermined temperature
A snow sensor (8) is provided.
When the outside air temperature exceeds the snow melting ability of the heater wire (2)
A parabolic antenna snow melting apparatus characterized in that it is controlled to an OFF mode when snow falls.