JP3778978B2 - Air conditioning duct installation structure in electromagnetic shield room - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for mounting an air conditioning duct to an electromagnetic shield room, and more particularly to a structure for mounting an air conditioning duct in a room where an electromagnetic shield is applied by covering the periphery with a conductor.
[0002]
[Prior art]
Measurement work for electromagnetic waves generated from electronic devices such as computers is affected by the influence of external electromagnetic waves during work, and the work accuracy is impaired. In order to prevent this reduction in work accuracy, this type of measurement work has been performed, for example, in a room called a shield room or an anechoic chamber (hereinafter referred to as an electromagnetic shield room).
[0003]
Also, when measuring the performance of a device that generates strong electromagnetic waves indoors, if this strong electromagnetic wave leaks out of the room, it may cause electromagnetic interference around the room, which may violate the Radio Law. Such work is also performed in the electromagnetic shield room.
[0004]
These electromagnetic shield rooms are designed to cover the surroundings with a conductor such as metal in consideration of the electromagnetic wave measurement in the room, etc., or cover the room with a conductor and then attach an electromagnetic wave absorber to the inner wall of the room. By preventing the reflection of electromagnetic waves, electromagnetic shielding is applied to shield external electromagnetic waves, and leakage of electromagnetic waves from the room to the outside is prevented, thereby improving the accuracy of this type of measurement work.
[0005]
Conventionally, air conditioning in such an electromagnetic shield room has been performed by an air conditioner, that is, an air conditioner installed outside the room, and the air conditioning duct is attached as follows. That is, one end of a rectangular cross-section duct is connected to the air outlet and the air inlet of the air conditioner, and the other end is connected to the outlet opening and the inlet opening formed on the outer wall of the electromagnetic shield room. The electromagnetic shield room side air outlet and air inlet are formed, and the air outlet and air inlet are provided with a wire mesh or a metal grid having an electromagnetic wave shielding function, and the electromagnetic shield room has an electromagnetic shielding property. The prevention of the fall was aimed at.
[0006]
In addition, there is a thing that secures the electromagnetic shielding property of the electromagnetic shield room by using the distance attenuation of the electromagnetic wave by connecting a long duct between the electromagnetic shield room and the air conditioner as necessary. .
[0007]
[Problems to be solved by the invention]
However, in the above-described conventional air-conditioning duct mounting structure for an electromagnetic shield room, the wire mesh or iron grid provided at the air outlet and air inlet on the electromagnetic shield room side is not sufficient to shield electromagnetic waves. Alternatively, electromagnetic waves may enter the electromagnetic shield room through the iron lattice. In addition, the method of attenuating electromagnetic waves using a long duct requires a very long duct to obtain sufficient shielding performance, and is difficult to install when the installation space is small. It was not a good idea. In addition, there is a problem that the shielding performance of the duct itself is required.
[0008]
Therefore, it has been difficult to connect the air conditioner to this type of electromagnetic shield room while maintaining the electromagnetic shielding property completely. Therefore, when the air-conditioning duct from the air conditioner is connected to the electromagnetic shield room by the conventional mounting structure, there is a problem that the accuracy of the measurement work performed inside the electromagnetic shield room has to be reduced.
[0009]
On the other hand, if the shielding property of electromagnetic waves in the electromagnetic shield room is emphasized and no suitable air conditioning device is provided in the electromagnetic shield room, or if an insufficient air conditioning device is provided, the air conditioning inside the electromagnetic shield room is not good. There was a problem that it was not possible to work comfortably because it was sufficient. These problems become more prominent as the shielding property of electromagnetic waves required for an electromagnetic shield room is higher.
[0010]
An object of the present invention is to solve such conventional problems, and appropriately performs air conditioning inside the electromagnetic shield room without impairing the electromagnetic shielding properties of the electromagnetic shield applied to the electromagnetic shield room. An object of the present invention is to provide a structure for attaching an air conditioning duct to an electromagnetic shield room.
[0011]
[Means for Solving the Problems]
The present invention is a structure for mounting an air conditioning duct to an electromagnetic shield room, and is configured as follows in order to solve the above-described technical problem. That is, the present invention is an air-conditioning duct mounting structure to an electromagnetic shield room in which an electromagnetic shield is provided by covering the periphery with a conductor, and between the electromagnetic shield room and an air conditioner installed outside thereof. A plurality of air conditioning ducts serving as air conduction paths are attached and communicated, and the plurality of air conditioning ducts are conductors, and have lengths 1 . 5m or more, is formed in a less diameter 1 0 cm, the air-conditioning duct, characterized in that it is arranged in 5 0 cm or more attachment interval. Hereinafter, the components of the present invention will be specifically described.
[0012]
(Air conditioning duct)
The plurality of air conditioning ducts serve as air conduction paths between the inside of the electromagnetic shield room and the air conditioning apparatus. Accordingly, one end of each air conditioning duct is connected to the air outlet and the air inlet of the air conditioner. At that time, one end of the plurality of air conditioning ducts can be connected to the air outlet and the air inlet of the air conditioner via a chamber or the like.
[0013]
Air conditioning duct, and for supplying the conditioned air into the electromagnetic shield room by the air conditioner, there are those of order Star return air in an electromagnetic shield room to the air conditioning apparatus, therefore it requires that at least two provided It is. However, any number of air conditioning ducts greater than that may be provided as long as the number is necessary for appropriately performing air conditioning inside the electromagnetic shield room.
[0014]
Such a plurality of air conditioning ducts are formed of a conductor and are arranged at a predetermined interval. The size of the air conditioning duct is a circular cross section having a diameter of 10 cm or less, and the interval is preferably 50 cm or more. By securing this interval, it is possible to prevent electromagnetic waves from entering inside due to the proximity of the air conditioning ducts. The arrangement of the plurality of air conditioning ducts may be linear or staggered.
[0015]
Further, the length of each air-conditioning duct is determined by utilizing the property that if the length is three times or more the diameter of the duct, electromagnetic waves having a frequency lower than the frequency specific to the diameter cannot pass through the duct. For example, when the diameter of the air conditioning duct is 10 cm, the length of the air conditioning duct may be 30 cm or more. However, the above-described properties are based on the assumption that there is one air conditioning duct, and when there are a plurality of air conditioning ducts, it is necessary to make the length longer. According to the measurement results in the experiment, when a plurality of air conditioning ducts are provided, the length of each air conditioning duct is preferably at least 1.5 m.
[0016]
The conductor covering the air-conditioning duct and the electromagnetic shield room may be brought into a completely electrically connected state by welding or brazing the entire part of the air outlet and the air inlet that are in contact with each other. is necessary.
[0017]
Furthermore, the conductor constituting the air conditioning duct may be any metal that can be welded or brazed. For example, carbon steel is suitable. According to the structure for attaching an air conditioning duct to an electromagnetic shield room of the present invention, an electromagnetic shield room having an electromagnetic shield by covering the periphery with a conductor and an air conditioner installed outside thereof have a predetermined diameter and length. And since it is connected by a plurality of air-conditioning ducts arranged at a predetermined interval, electromagnetic waves from the outside of the electromagnetic shield room are effectively shielded. Further, the electromagnetic wave that is generated inside the electromagnetic shield room can be effectively prevented also benzalkonium be leaked to the outside.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
In the following, the air conditioning duct mounting structure for an electromagnetic shield room of the present invention will be described in more detail with reference to the embodiment shown in the drawings. FIG. 1 is a perspective view showing an air conditioning duct mounting structure 10 to an electromagnetic shield room according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the air conditioning duct mounting structure 10 to the electromagnetic shield room shown in FIG. It is.
[0019]
The air-conditioning duct mounting structure 10 to the electromagnetic shield room in this embodiment is provided by providing a plurality of air-conditioning ducts 14a and 14b formed of steel pipes between the electromagnetic shield room 15 and the air-conditioning apparatus 11 installed outside thereof. It is configured. Actually, each of the air conditioning ducts 14a and 14b is configured such that one end thereof is connected to the air conditioner 11 via the relay ducts 12a and 12b and the chambers 13a and 13b, and the other end is connected to the electromagnetic shield room 15. Yes.
[0020]
The electromagnetic shield room 15 has an outer wall made entirely of metal, thereby providing an electromagnetic shield around it. A specific method for attaching the air-conditioning ducts 14a and 14b to the electromagnetic shield room 15 will be described below. As shown in FIG. A plurality of opening holes 19a and 19b are provided as air outlets through which conditioned air from the air conditioner 11 is blown out and suction ports for returning the air in the electromagnetic shield room 15 to the air conditioner 11.
[0021]
The opening holes 19a and 19b are provided at an appropriate mounting interval in the horizontal direction in consideration that the other ends of the air conditioning ducts 14a and 14b are mounted. But the position which provides opening hole 19a, 19b is not restricted to this, According to the desired air-conditioning environment with respect to the electromagnetic shielding room 15, it can change suitably.
[0022]
The air conditioner 11 itself is the same as the conventional one, and includes a compressor that compresses the medium, a heat exchanger, and a blower as main parts. As shown in FIG. 2, the air conditioner 11 is provided with openings 17 a and 17 b serving as an air outlet and an inlet on the upper surface and side surfaces, respectively.
[0023]
The chambers 13a and 13b are formed in a rectangular parallelepiped box shape as shown in FIG. 1, and the side surfaces in the width direction are connected to the openings 17a and 17b of the air conditioner 11 via relay ducts 12a and 12b, respectively. ing. Moreover, each chamber 13a, 13b is arrange | positioned so that each length direction may become horizontal. These chambers 13a and 13b and relay ducts 12a and 12b can be of any kind that has been conventionally used.
[0024]
Each air-conditioning duct 14a, 14b uses a carbon steel straight pipe having a circular cross section, and has a length of about 1.5 m and a diameter of about 10 cm. However, the length of the air-conditioning ducts 14a and 14b can be appropriately changed as long as the length is about 1.5 m or more and the diameter is about 10 cm or less.
[0025]
A plurality of air conditioning ducts 14a and 14b are connected in a state where one end of the air conditioning ducts 14a and 14b extends in the horizontal direction from the side wall in the longitudinal direction of each chamber 13a and 13b. Is connected to the interior of the.
[0026]
The other ends of the air-conditioning ducts 14a and 14b are connected in alignment with the opening holes 19a and 19b on the side walls of the electromagnetic shield room 15, and are fixed by welding the connected portions. This connecting part may be brazed. As a result, air leakage is prevented from the connection portion between the electromagnetic shield room 15 and the air conditioning ducts 14a and 14b, and electromagnetic waves enter the shield room 15 from the connection portion, and to the outside from the shield room 15. Can effectively prevent leakage of electromagnetic waves.
[0027]
The air conditioning ducts 14a and 14b are provided in parallel between the electromagnetic shield room 15 and the chambers 13a and 13b while maintaining a fixed mounting interval. At this time, the other end of each air-conditioning duct 14a, 14b is welded at an attachment interval of about 50 cm. However, this mounting interval can be appropriately changed if it is about 50 cm or more. By maintaining a fixed mounting interval in this way, electromagnetic waves enter the electromagnetic shield room 15 through the air conditioning ducts 14a and 14b, and electromagnetic waves from the electromagnetic shield room 15 through the air conditioning ducts 14a and 14b. Leakage to the outside can be prevented more effectively.
[0028]
Each of the air conditioning ducts 14a and 14b has a cutoff frequency of 1.63 GHz when the length is 30 cm and the diameter is 10 cm, for example, and does not allow electromagnetic waves below this cutoff frequency to pass through the duct. .
[0029]
According to the mounting structure 10 of the air conditioning duct to such an electromagnetic shield room, the air heated or cooled by the heat exchanger of the air conditioner 11 is sent out from the opening 17a by the blower and passes through one of the relay ducts 12a. It is sent to the chamber 13a and sent into the electromagnetic shield room 15 from each opening hole 19a through each air conditioning duct 14a.
[0030]
On the other hand, the air in the electromagnetic shield room 15 is sucked into the air conditioner 11 from the opening hole 19b through the air conditioning ducts 14b, the chamber 13b, the relay duct 12b, and the opening 17b.
[0031]
At this time, a straight carbon steel pipe having a length of about 1.5 m and a diameter of about 10 cm is used for each of the air-conditioning ducts 14a and 14b, and the other end of each of the air-conditioning ducts 14a and 14b has an installation interval of about 50 cm. Since the electromagnetic wave having a frequency of 10 kHz to 1 GHz outside the electromagnetic shield room 15 passes through the electromagnetic shield room 15 or the air conditioning ducts 14a and 14b, it is attenuated by 100 dB or more. .
[0032]
According to the air conditioning duct mounting structure 10 to the electromagnetic shield room described above, air conditioning in the electromagnetic shield room 15 which has been difficult in the past can be appropriately performed without reducing the shielding performance of electromagnetic waves by the electromagnetic shield. For this reason, in the electromagnetic shield room 15, the work performed there can be performed in a comfortable environment, and the work efficiency can be further improved.
[0033]
【The invention's effect】
As described above, according to the air conditioning duct mounting structure to the electromagnetic shield room in the present invention, it is possible to connect the air conditioning duct from the air conditioner without impairing the electromagnetic shielding property of the electromagnetic shield applied to the electromagnetic shield room. Therefore, air conditioning inside the electromagnetic shield room can be performed appropriately.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a structure for attaching an air conditioning duct to an electromagnetic shield room according to an embodiment of the present invention.
2 is a cross-sectional view of a structure for attaching an air conditioning duct to the electromagnetic shield room shown in FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Air-conditioning duct attachment structure to electromagnetic shield room 11 Air conditioning apparatus 14 Air-conditioning duct 15 Shield room 17 Opening part 19 Opening hole

Claims (1)

An air conditioning duct mounting structure to an electromagnetic shield room where electromagnetic shielding is applied by covering the surrounding area with a conductor,
A plurality of air conditioning ducts serving as air conduction paths are connected between the electromagnetic shield room and the air conditioner installed outside thereof, and communicated with each other.
The plurality of air conditioning ducts are conductors and have a length of 1 . 5m or more, is formed in a less diameter 1 0 cm, the air-conditioning duct, air conditioning duct installation structure to the electromagnetic shield room, characterized in that it is arranged in 5 0 cm or more attachment interval.

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