JP2506528B2 - Heater base mounting structure for outdoor 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 heater earth mounting structure for outdoor equipment such as satellite dish receiving parabolic antenna.

[0002]

2. Description of the Related Art For example, in a satellite dish for satellite broadcasting reception, if snow or snow is generated on the surface of the antenna, the receiving sensitivity is significantly lowered. Is equipped with a snow melting device.

That is, in the snow melting device for the parabolic antenna, a planar heating element made of aluminum foil with a linear heater attached is attached to the back surface of the antenna reflecting mirror. In this case, the linear heater is not insulated. Although it has a cover, if the outer cover is deteriorated, the heater core wire and the aluminum foil may come into contact with each other to cause electric leakage. Therefore, it is necessary to attach the heater ground in consideration of safety.

[0004]

However, since the aluminum foil is very thin, usually about 0.1 mm, it is structurally weak and it is difficult to directly connect the ground wire.

On the other hand, the object to be heated on the back surface of the antenna reflector to which the aluminum foil as the sheet heating element is attached is usually made of a non-conductive material made of plastic, and the cover covering the back surface of the antenna is also made of plastic. Therefore, even if there is a leakage of electricity from the heater core wire to the aluminum foil, there is no danger of an electric shock immediately from the outside of the antenna.

The present invention has been made in view of the above problems,
In case of leakage from the heater core wire to the heating conductor,
It is an object of the present invention to provide a heater earth mounting structure in an outdoor device that can prevent electric shock via moisture.

[0007]

That is, a heater earth mounting structure in an outdoor device according to the present invention is a linear heater having an insulating jacket attached to a heated body made of a conductive material through a conductor, The grounding conductor is mounted near the conductor in a non-contact manner with the conductor, a power supply line for supplying power to the linear heater, and an earth leakage breaker interposed in the power supply line. .

[0008]

In other words, when the conductor and the ground conductor are electrically connected by the interposition of water, so that the leakage current from the heater core wire is generated in the heating conductor, the leakage current is grounded through the ground conductor.
The earth leakage breaker of the power line will operate.

[0009]

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

FIG. 1 shows a heater mounting state in a heater earth mounting structure of a parabolic antenna. In FIG. 1, reference numeral 1 denotes a rear surface of a reflector of an offset parabolic antenna for receiving satellite broadcasting which is a heated body. The back surface 1 is made of a plastic non-conductive material, and the aluminum foil 2 to which the heater wire 3 is attached is attached as a heater unit to the back surface 1 of the reflecting mirror.

A conductive metal plate 4 having a thickness of about 1 mm is attached to the inner surface of the outer frame 1a integrated with the outer periphery of the rear surface 1 of the reflecting mirror in the vicinity of the aluminum foil 2 without contact. ,
A ground wire 5 is connected to the conductive metal plate 4. Here, the conductive metal plate 4 is attached to the inner side surface of the outer frame 1a corresponding to the lowermost part of the parabolic antenna.

FIG. 2 shows the heater ground mounting portion of the heater ground mounting structure for the parabolic antenna in an extracted manner. The outer frame 1a corresponding to the lowermost part of the antenna to which the conductive metal plate 4 to which the ground wire 5 is connected is mounted. A drainage hole 14 is formed on the inner surface of the side by side with the conductive metal plate 4.

In this case, the moisture 6 that has penetrated inside the antenna
Is drained from the water draining hole 14 and when the infiltrated water 6 reaches between the aluminum foil 2 and the conductive metal plate 4 which are arranged in a non-contact manner, the aluminum foil 2 and the conductive metal plate 4 pass through the water 6 Becomes conductive.

FIG. 3 shows a state in which the heater wire 3 is adhered to the aluminum foil 2 in the heater earth mounting structure of the parabolic antenna. The heater wire 3 is composed of a heater core wire 15 and an insulating jacket 16 which generate heat by power supply. The heat generated by the heater core wire 15 is transmitted to the aluminum foil 2 via the heater jacket 16.

FIG. 4 shows a wiring state in the heater earth mounting structure of the parabolic antenna. The reflecting mirror back surface 1 to which the heater unit composed of the aluminum foil 2 and the heater wire 3 is attached is further laminated with the foamed heat insulating material 7. It is interposed and covered by a plastic back shell 8. As a result, the heater unit and the conductive metal plate 4 are prevented from being exposed to the outside to form a drip-proof structure.

A relay box 9 is provided for the back shell 8, and the heater wire 3 is provided through the relay box 9.
The power supply line 10 is connected to the AC power supply 100V, and the earth line 5 is led out to the ground 11. A wiring breaker 12 and an earth leakage breaker 13 are inserted in the power supply line 10 to provide protection against overcurrent and earth leakage.

That is, in the heater earth mounting structure of the parabolic antenna having the above-described structure, when power of AC 100 V is supplied to the heater wire 3 through the power supply wire 10, the heater core wire 15 generates heat, and this heat generation causes the heater jacket 1 to generate heat.
It is transmitted to the aluminum foil 2 via 6 and the back surface 1 of the reflector of the parabolic antenna as the object to be heated is heated. As a result, snowfall or snow accretion that may occur on the reflecting mirror surface of the parabolic antenna is prevented in advance, and a decrease in reception sensitivity due to snowfall is prevented.

Here, for example, the heater jacket 1 of the heater wire 3
When 6 deteriorates and breaks, the heater core wire 15 to the aluminum foil 2
Although the leakage of electric current occurs, the rear surface 1 of the reflecting mirror and the back shell 8 which are in contact with the aluminum foil 2 are both made of a plastic non-conductive material, so that leakage to the outside of the antenna is prevented. Therefore, in this case, there is no risk of electric shock from the outside of the antenna.

On the other hand, in the state where the aluminum foil 2 is leaked inside the antenna, when the thawed water or the rainwater enters the inside of the back shell 8 and its moisture 6 comes into contact with the aluminum foil 2 or the conductive metal plate 4, The aluminum foil 2 and the conductive metal plate 4 are electrically connected via the moisture 6 and a grounding state is established via the ground wire 5. Then, the earth leakage breaker 12 interposed in the power supply line 10 is activated and the power is cut off. Therefore,
In this case, it is possible to prevent electric shock from the outside of the antenna through the moisture.

Therefore, according to the heater earth mounting structure of the parabolic antenna having the above-mentioned structure, the aluminum foil 2 serving as the planar heating element attached to the back surface 1 of the reflecting mirror of the parabolic antenna.
And a conductive metal plate 4 placed close to the aluminum foil 2 in a non-contact manner
When the leakage occurs from the core wire of the heater wire 3 whose outer cover is torn to the aluminum foil 2 due to the conduction of the moisture 6 which has penetrated into the antenna, the leakage current is generated from the conductive metal plate 4. Since the earth leakage breaker which is grounded via the earth wire 5 and intervenes in the power supply line of the heater wire 3 is operated, when snowmelt water or rainwater enters the antenna when earth leakage occurs on the aluminum foil 2. It is possible to prevent electric shock from the outside of the antenna through the moisture.

[0021]

As described above, according to the present invention, a linear heater having an insulating jacket attached to a heated body made of a conductive material via a conductor, and the conductor not adjacent to the conductor in the vicinity of the conductor. A structure in which a grounding conductor mounted by contact, a power supply line for supplying power to the linear heater, and an earth leakage breaker interposed in the power supply line are provided, and the conductor and the grounding conductor are electrically connected by the presence of water. Therefore, when a leakage of electricity from the heater core wire to the heating conductor occurs, it is possible to prevent electric shock via water.

[Brief description of drawings]

FIG. 1 is a diagram showing a heater mounting state in a heater earth mounting structure of a parabolic antenna according to an embodiment of the present invention.

FIG. 2 is a diagram showing a heater earth attachment portion extracted from the heater earth attachment structure of the parabolic antenna.

FIG. 3 is a diagram showing a bonding state of a heater wire to an aluminum foil in the heater earth mounting structure of the parabolic antenna.

FIG. 4 is a diagram showing a wiring state in the heater earth mounting structure of the parabolic antenna.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reflector back surface 1a ... Outer frame, 2 ... Aluminum foil, 3 ... Heater wire, 4 ... Conductive metal plate, 5 ... Ground wire, 6 ... Moisture, 7
... Insulation material, 8 ... Back shell, 9 ... Relay box, 10 ... Power line, 11 ... Grounding, 12 ... Wiring circuit breaker, 13 ... Leakage breaker, 14 ... Drain hole, 15 ... Heater core wire, 16 ... Heater outside Cover.

Claims (1)

(57) [Claims] 1. A linear heater having an insulating jacket attached to a heated body made of a non-conductive material via a conductor, a ground conductor attached in the vicinity of the conductor in a non-contact manner with the conductor, A heater earth in an outdoor device, comprising: a power supply line for supplying power to the linear heater; and an earth leakage breaker interposed in the power supply line, wherein the conductor and the ground conductor are electrically connected by the presence of water. Mounting structure.