JPH0563434A - Structure for melting snow for parabola antenna - Google Patents

Abstract

PURPOSE:To provide a snow melting structure capable of easily mounting on a standard antenna afterwards as needed and producing components at a low cost. CONSTITUTION:In a parabola antenna with a reflection mirror 1 integrally fixed on a cylindrical center hub 2, a cover main body 6 having the same curved surface as a main mirror face 1a is prepared by using the same press type and diaphragm type. A surrounding wall 7 with the prescribed height is fixed along the circumference, which is divided into two along the diameter, making half bodies 6a and 6b. A heat insulation barrier 15 is formed by the spraying process to the inner surface of the half body. Thus obtained two half bodies 6a and 6b are installed parallely to the rear side of the main mirror face 1a putting a center hub 2 between them. A practically airtight space is formed between the main mirror face and the rear surface, and a heating unit H is installed in the space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a parabolic antenna having a relatively small diameter, and more particularly to a novel snow melting structure for preventing snow accretion on a radio wave reflecting surface of a reflecting mirror.

[0002]

2. Description of the Related Art Parabolic antennas are often used outdoors and have the opportunity to be exposed to various natural environments. In particular, when used in cold regions, ice and snow may adhere to the main mirror surface of the reflecting mirror to deteriorate the function of the antenna. As a countermeasure against such ice and snow, a special seat is provided on the back side of the main mirror surface of the antenna, and a specially shaped cover is attached to form a closed space between the rear surface of the main mirror surface and the heater and fan inside the space. A heating unit consisting of the following is installed, and heated air is forcibly circulated in the space to heat the main mirror surface and melt snow accretion.

[0003]

However, in this method, it is necessary to newly form a cover to be attached to the rear surface of the main mirror surface, it is impossible to additionally attach a cover later, and heat insulation is required. It takes time to attach the material,
There are problems such as difficulty in arranging the heating unit.

The present invention solves the above problems of the prior art, and provides a standard type antenna having no snow melting structure,
If necessary, you can easily attach it later, and
An object of the present invention is to provide a snow-melting structure that allows component parts to be manufactured at low cost.

[0005]

The object of the present invention is to provide, in a parabolic antenna having a reflecting mirror integrally fixed on a cylindrical center hub, the same press die or diaphragm die as used for producing the main mirror surface. A cover main body having the same curved surface as the main mirror surface is prepared using, and a peripheral wall having a predetermined height is fixed along the circumference thereof, and divided into two along the diameter to form a half body, A layer of heat insulating material is formed on the inner surface of the half body by spraying, and the two half bodies thus obtained are mounted parallel to the back surface of the main mirror surface with the center hub sandwiched between them and the back surface of the main mirror surface. This is achieved by a snow melting structure of a parabolic antenna, characterized in that a substantially sealed space is formed in the space, and a heating unit is installed in the space.

[0006]

In the present invention, since the cover main body is formed of the same curved surface as the main mirror surface, the same press die or drawing die used in the manufacturing process of the main mirror surface can be diverted as it is,
Since it is not necessary to prepare a new mold, the manufacturing cost can be reduced. Further, since the heat insulating material layer on the inner surface of the cover is formed by the spraying process, it is possible to save the labor of pasting the heat insulating material sheet as in the conventional case and reduce the manufacturing cost. Further, since the cover is divided into two parts, it is possible to easily cope with a case where a snow melting structure is additionally installed later as needed with respect to the standard antenna.

Based on the preferred embodiment shown in the drawings,
The present invention will be described in more detail.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the main structure of a standard type parabolic antenna having no snow melting structure. A reflecting mirror 1 having a main mirror surface 1a is integrally fixed to a center hub 2 and its elevation angle and azimuth angle are arbitrarily adjusted. It is installed on the pedestal 3 as much as possible. Reference numerals 4 and 5 indicate a feed horn and a sub-mirror, respectively.

FIG. 2 shows the standard parabolic antenna to which the snow melting structure of the present invention is added. A cover main body 6 installed so as to cover the back side of the main mirror surface 1a of the reflecting mirror and a certain distance from the reflecting mirror 1, and a peripheral wall 7 that rises at a right angle from the circumference and reaches the outer periphery of the main mirror surface 1a. The cover consisting of and forms a substantially sealed space between the back surface of the main mirror surface 1a and the covers 6 and 7. A heating unit in which a heater 8 and a fan 9 are incorporated is installed at an appropriate location in the space, heats the air in the space to forcibly circulate in the space, and heats the main mirror surface 1a from the back surface. It is configured to melt the ice and snow adhering to the surface.

To describe the structure in more detail, the cover body 6 is made of a metal sheet so as to have the same curved surface as the main mirror surface 1a. That is, the press die and the drawing die used in the production process of the main mirror surface are diverted as they are to produce. Therefore, it is not necessary to prepare a new mold for manufacturing the cover body, and the cover body can be manufactured at low cost. However, the central region is notched in a circular shape so as to escape the center hub 2 when it is attached to the reflecting mirror as shown in FIG.

The peripheral wall 7 attached to the peripheral edge of the cover body 6 is formed by cylindrically rolling a metal sheet having a constant width, and is provided on the peripheral edge of the cover body 6 as shown in FIG. Caulking 1 against the flange
It is fixed by 0 and integrated. On the inner surface of the cover thus formed, a heat insulating material such as polyurethane foam is sprayed to form the heat insulating layer 15.

The covers 6 and 7 thus prepared
Is divided into two along its diameter and divided into two halves 6
It is divided into a and 6b. This snow melting structure is
To attach to the Bora antenna, first outside the center hub 2.
The seat 8 provided at a predetermined position on the wall surface causes the heater 8 to
A heater unit including the fan 9 is installed. Next, before
Half of cover half 6 prepared as described above
Main mirror surface so that a and 6b sandwich the center hub 2 from both sides
It is placed on the back side of 1a. Then, as shown in FIG.
The peripheral wall 7 of the cover is caulked at the folded portion on the outer periphery of the reflecting mirror 1.
Fixed to the nut 12 'by the screw 12,
The cover that contacts the center hub 2 as shown in FIG.
The base part of the half body 6a or 6b is a caulking part on the fitting 13.
It is fixed by means of 19 and through the metal fitting 13
Fixed to the caulking nut 14 'of the bush 2 with a screw 14
It As a result, the covers 6 and 7 are provided on the rear surface of the main mirror surface 1a.
On the other hand, a constant distance L in the axial direction₁Heated separately
A closed space containing the unit H is formed. For this
Then, in more detail, as shown in FIG.
Axial distance L between the back surface of 1a and the cover body 6 ₁Is constant
Therefore, in the area near the center, the distance between
Distance C₁Is the distance C in the vertical direction in the peripheral region₂Greater than
And allow enough room to install the heating unit.
There are some advantages.

As shown in FIG. 5, the two heating units H are installed symmetrically with respect to the center hub 2, and it is desirable that the blowing directions of the heating units H be set so that they are in a normal wind. A smooth forced circulation is formed inside, and uniform heating of the entire main mirror surface 1a is achieved.
However, the number of heating units installed, the number of heaters combined with a fan, and the like can be appropriately selected according to the environmental conditions in which the parabolic antenna is installed, that is, the snowfall condition.

Further, as shown in FIGS. 2 and 5, the cover body 6
The lid 17 at the position corresponding to these heating units H.
The opening 16 that can be opened and closed by the heating unit H
It is used for maintenance and inspection.

[0015]

As described above in detail, according to the present invention, the cover body and the main mirror surface have the same curved surface.
It is not necessary to prepare a new mold for manufacturing the cover, and the one used for manufacturing the main mirror surface can be used as it is, and the manufacturing cost can be reduced.

Since the main mirror surface and the cover body are the same curved surface, the distance between them is kept constant, so that the sealed space near the center hub is easier to use than the space in the peripheral area, The heating unit can be accommodated with a sufficient margin.

[Brief description of drawings]

FIG. 1 is a side view of a standard parabolic antenna before a snow melting structure of the present invention is added.

FIG. 2 is a side view of the parabolic antenna of FIG. 1 to which the snow melting structure of the present invention has been added.

FIG. 3 is a side sectional view showing fixing of a cover and a reflecting mirror.

FIG. 4 is a side sectional view showing fixing of the cover and the center hub.

FIG. 5 is a rear view of the snow melting structure of the present invention.

FIG. 6 is a schematic diagram showing the difference in distance between the main mirror surface and the cover body depending on the position in the space.

[Explanation of symbols]

 1 ... Reflecting mirror 1a ... Main mirror surface 2 ... Center hub 3 ... Pedestal 4 ... Feed horn 5 ... Sub mirror 6 ... Cover main body 7 ... Peripheral wall H ... Heating unit 15 ... Heat insulation layer

Claims (1)

[Claims] 1. In a parabolic antenna having a reflecting mirror (1) integrally fixed on a cylindrical center hub (2), the same press die and diaphragm used for producing the main mirror surface (1a). A cover body (6) having the same curved surface as the main mirror surface was prepared using a mold, and a peripheral wall (7) having a predetermined height was fixed along the circumference of the cover main body (6) and divided into two along the diameter. To form a half body (6a, 6b), and a layer (15) of a heat insulating material is formed on the inner surface of the half body by spraying, and the two half bodies (6a, 6b) thus obtained are formed into a center hub. It is attached in parallel to the back surface of the main mirror surface (1a) with (2) in between,
A snow melting structure for a parabolic antenna, characterized in that a substantially sealed space is formed between the main mirror surface and the back surface, and a heating unit (H) is installed in the space.