JPH0334952Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an anechoic chamber, particularly to the structure of a side wall of an anechoic chamber.

[Conventional technology]

Conventional anechoic chambers are constructed by building an outer shell structure that is one size larger than the anechoic chamber at the installation location, then attaching shielding material to the inner wall of the outer shell structure using mounting brackets, etc. to construct a shield room. There was one structure in which the radio wave absorber was fixed to the walls and ceiling with adhesive, and another structure in which the shield panel with radio wave absorber was fixed to the inner wall of the outer shell structure with mounting brackets.

[The problem that the idea aims to solve]

In the former case, where the radio wave absorber is glued to the inner wall of the shield room at the construction site, the radio wave absorber must be held until the adhesive hardens, which requires a lot of auxiliary materials and man-hours. There were problems with the long construction period and low work efficiency. In addition, when using the latter type of shield panel with a radio wave absorber, the panel is attached to the outer shell structure using mounting brackets, so there is a problem that work space is required both on the outside and inside of the outer shell structure, and the radio wave absorber is damaged. There was a problem that it was difficult to replace the panels at times.

[Means to solve the problem]

The purpose of the present invention is to provide an inexpensive radio anechoic chamber that can be constructed in a short period of time by eliminating the work space outside the side wall of the outer shell structure.

The anechoic chamber of the present invention is a radio anechoic chamber in which radio wave absorbers are arranged on the inner wall of an outer shell structure, which are arranged in parallel along the inner wall, and the radio wave absorbers are provided on one side of a metal shield plate. A plurality of shield panels, a latching fitting protruding from the upper part of the opposite side of the metal shield plate of each shield panel, and a latching fitting protruding from the inner wall and latching the above-mentioned latching fitting, the shield a hanging fitting for suspending the panel, the metal shield plate of each of the shield panels is provided with an overlapping part that protrudes above the radio wave absorber, and each of the shield panels is mounted on the opposite side of the metal shield plate. The lower part of the shield panel is prevented from moving toward the inner wall by overlapping with the overlapping part of the shield panel adjacent to the lower part of the shield panel.

[Effect]

The shield panel equipped with the radio wave absorber is divided into multiple parts and attached by hooking the upper latching metal fittings to the hanging metal fittings protruding from the inner wall, so each piece can be mass-produced in a factory, improving efficiency. Further, the lower part of the shield panel is prevented from moving toward the inner wall by contacting means.

〔Example〕

FIG. 1 is a sectional side view of a main part of an embodiment showing a part of a side wall of an anechoic chamber according to the present invention.

In the figure, 1 is a shield panel with a radio wave absorber, and 2 is a side wall of the outer shell structure.

The shield panel 1 with a radio wave absorber is a panel with a weight and size that can be easily handled by a worker, and a shield plate (steel plate) 3 with a required thickness (for example, 1.6 mm) so that the panel has the strength to withstand handling. As shown in FIG.
The other side of the shield plate 3 is integrally provided with a hook 6 having an inverted L-shaped cross section along the upper edge.

The radio wave absorber 4 is a molded body made of foamed polystyrene or foamed urethane impregnated with an appropriate amount of carbon. For example, as shown in FIG. 2, it is shaped like nine square pyramids of the same size stacked on a square base. It is something. The radio wave absorber 4 can be selected as appropriate, such as one in which urethane foam is provided on a ferrite tile, or one in which polystyrene foam is laminated with different amounts of carbon impregnation.

This panel 1 can be efficiently mass-produced in a dedicated factory,
It can be easily supplied when construction of the outer shell structure is completed.

In FIG. 1, the radio wave absorbers provided on the shield panel 1 are provided at predetermined locations on the side wall 2 of the outer shell structure at intervals of a height H, and rail-shaped suspension fittings 7 with an inverted L-shaped cross section are provided. protrudes parallel to the floor.

A hanging metal fitting 7 is attached to the hanging metal fitting 6 provided on the panel 1.
When the panel 1 is hung freely, the center of gravity G of the panel 1 moves to just below the hanging fitting 7, as shown in Fig. 1, and the contact point between the hanging fitting 6 and the hanging fitting 7 is The lower end of the panel 1 swings toward the side wall 2 as the center. (In Figure 1, the protruding length of the hanging bracket 7 is small, so the lower end of the panel 1 comes into contact with the side wall 2, and the center of gravity G cannot move to just below the hanging bracket 7.) Therefore, the shield plate on the floor At the top, a long locking plate is provided along the side wall 2 at a position where the shield plate 3 of the panel 1 hung on the lowest suspension bracket 7 is almost vertical, and the radio wave absorber 4 of the panel 1 and the side wall 2 are connected by providing a long locking plate along the side wall 2.
It is desirable to prevent collisions with

The panel 1 is hung on the hanging metal fitting 7 at the lowest stage by the hanging metal fitting 6, and the panel 1 is slid from side to side on the hanging metal fitting 7, so that the side end surfaces of the panels 1 are brought into contact with each other, and the required number of panels is attached. When attached in the same manner to the hanging bracket 7 on the second tier from the floor, the panel 1 suspended on the second tier will be suspended by the overlapping part 5 of the adjacent lower panel 1, as shown in FIG. The deflection of the lower end is prevented, and the shield plates 3 of the panel 1 are brought into contact with each other at the overlapping portion 5 and are connected to each other vertically. At this time, the overlapping portion 5 acts as a contact means for preventing the panel 1 from moving toward the side wall 2. Panels 1 are similarly attached to the hanging fittings 7 on the third and subsequent stages to constitute one side wall of the anechoic chamber. Note that since a working space above the ceiling of the outer shell structure is essential, the panel 1 may be attached to the uppermost hanging fitting 7 from this upper working space.

On the adjacent side wall of the anechoic chamber, a corner panel consisting of only the shield plate 3 shown in FIG. With this configuration, the gap between the left and right shields on the side walls of the anechoic chamber is kept small.

FIG. 3 is an enlarged side view showing another embodiment of section A in FIG. 1. The cross-sectional shape of the hanging fitting 7 is a circular head type, and the corner on the free end side of the hanging fitting 6 of the panel 1 has a circumference corresponding to the circular head.
The angle θ at the base of the hanging metal fitting 6 is set to be slightly smaller than the right angle, so that the hanging metal fitting 6 and the hanging metal fitting 7 are engaged at the same place by the force of swinging the panel 1 as shown by the chain line. Connection at the overlapping portion 5 of the panel 1 can always be ensured under the same conditions, and side walls with no left and right shield gaps can be obtained.

FIG. 4 shows an enlarged side view similar to FIG. It has a structure in which it is provided so as to protrude from the edge and is engaged with the hanging fitting 7 at the same location.

[Effect of idea]

As explained above, according to the present invention, the panels can be mass-produced in a dedicated factory, so they are inexpensive, of good quality, and easy to handle and install, making it possible to construct an anechoic chamber in a short construction period. Furthermore, since the present invention does not require a work space outside the side wall, the installation area is smaller than before, and the panel can be installed freely, so it is easy to replace individual panels as well as reassemble the entire side wall. There is also the advantage of having one. Furthermore, the metal shield plate of each shield panel is made to protrude above the radio wave absorber to provide an overlapping part, and the lower part of each shield panel is overlapped with the overlapping part of the shield panel below it, so that the shield In addition to preventing the panel from swinging around the hanging bracket, the metal shield plates of multiple shield panels are electrically connected to each other, thus preventing irregular reflections of radio waves. .

At the same time, by placing the lower part of each shield panel in contact with the radio wave absorber of the lower shield panel and overlapping it in the overlapped part, it is possible to easily align the panels, and therefore the shield It can prevent the installation posture between panels from bending.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the main part showing an embodiment of the present invention, Fig. 2 is an external view showing an embodiment of the shield panel with a radio wave absorber used in the invention, and Fig. 3 is the same as Fig. 1. FIG. 4 is an enlarged side view showing one embodiment of the A part, and FIG. 4 is an enlarged side view showing still another embodiment of the A part. In the figure, 1... Shield panel with radio wave absorber, 2... Side wall, 3... Shield plate, 4... Radio wave absorber, 6... Hanging metal fitting, 7... Hanging metal fitting.

Claims (1)

[Scope of utility model registration request] In a radio anechoic chamber in which a radio wave absorber is arranged on the inner wall of an outer shell structure, a plurality of shield panels are arranged in parallel along the inner wall and the radio wave absorber is provided on one surface of a metal shield plate; , a hanging metal fitting protruding from the upper part of the opposite side of the metal shield plate of each shield panel, and a hanging metal fitting protruding from the inner wall and suspending the shield panel by latching the hanging metal fitting. The metal shield plate of each of the shield panels is provided with an overlapping part that protrudes above the radio wave absorber, and each of the shield panels has a metal shield plate with a lower part of the opposite surface lower than that. A radio anechoic chamber characterized in that the shield panel is overlapped with the overlapping portion of the shield panel adjacent to the shield panel, thereby being prevented from moving toward the inner wall.