JP2005286260A - Muffling cabinet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a muffling cabinet which has a simple structure, is a low cost, can easily change respective directions of the openings depending on the installing condition, and can be applied to existing cabinets. <P>SOLUTION: An adapter 8 is attached to the outside of an intake port 4 and an exhaust port 5 formed on a cabinet body 1. Flexible sound absorbing ducts 12, 13 are respectively attached to the intake side and the exhaust side. Ventilating fans 6, 7 intake and exhaust the air through these sound absorbing ducts 12, 13. The sound absorbing ducts 12, 13 are preferably of a bellows structure, and the respective directions of their opening ends 14, 15 can be freely changed depending on the installation place. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a muffler cabinet equipped with a ventilation fan for preventing an increase in temperature inside the panel due to heat generated by internal equipment.

  In a cabinet in which communication devices and other electronic devices are housed inside the cabinet, malfunction may occur if the temperature inside the panel rises too much due to heat generated by the electronic devices. Therefore, some coolers are provided inside the cabinet to cool the inside of the cabinet, but if outside air is not affected by electronic equipment, cooling is often provided by providing a lower ventilation fan than the cooler. .

  However, noise is generated by wind noise when operating a ventilation fan and driving sound of a fan of an electronic device installed inside, which becomes a noise problem in an urban area. Especially when installed in a condominium, etc., if the air intake and exhaust holes formed on the side of the housing face the private house side, the sound waves emitted from the air intake and exhaust holes will reach the private house. It is easy and noise may be regarded as a problem.

  Therefore, as shown in Patent Document 1, a cabinet has been proposed in which the entire front surface of the housing on the ventilation fan side is covered with a duct, and intake and exhaust are performed through the upper opening. Although the structure of Patent Document 1 can be expected to have an excellent noise prevention effect, the structure is complicated, a dedicated duct is required for each cabinet, and the opening serving as a sound source is limited to the upper side. Is emitted upward and there is a problem such as a noise problem when a high-rise apartment is built in the adjacent land.

Patent Document 2 describes a silencer that is attached to the top of a housing such as a large computer. This is a box having a sound absorbing material inside, and an excellent noise prevention effect can be expected. However, it is assumed that the silencer of this Patent Document 2 is used indoors, and there are problems that it cannot be used outdoors, and that the entire size of the silencer body is increased because the silencer body is installed on the upper part of the device housing.
JP 2003-204183 A Japanese Patent Laid-Open No. 5-102684

  The present invention solves the above-mentioned conventional problems, has a simple structure and is low in cost, can easily change the direction of the opening according to the installation conditions, and can be applied to an existing cabinet. It was made to provide a muffler cabinet that can be installed outdoors.

  The silencer type cabinet of the present invention made to solve the above problems has a flexible sound absorption duct attached to at least one of an intake hole and an exhaust hole formed in a housing having a ventilation fan inside. It is characterized by. In addition, it is preferable that the sound absorbing duct is provided with a sound absorbing material at all or part of the inside thereof, and the sound absorbing duct preferably has a bellows structure.

  Since the sound deadening cabinet of the present invention has a flexible sound absorbing duct attached to at least one of the intake hole and the exhaust hole formed in the housing, noise using the intake hole or the exhaust hole as a sound source Can be attenuated internally. In this way, the sound absorption duct is simply attached to the intake and exhaust holes, so that the cost is low, and the sound absorption duct can be attached to an existing cabinet, and the sound absorption duct is flexible, so its direction can be freely changed. The noise problem can be avoided by changing the direction of the open end of the sound absorption duct so as not to face the private house according to the installation conditions of the cabinet.

Preferred embodiments of the present invention are shown below.
FIG. 1 is a side view showing a muffler cabinet according to the first embodiment of the present invention, and FIG. 2 is a rear view thereof. Reference numeral 1 denotes a cabinet housing. A door 2 is provided in front of the cabinet, and an electronic device 3 such as a communication device is accommodated therein. In order to prevent an increase in internal temperature due to heat generated by the electronic device 3, an intake hole 4 and an exhaust hole 5 are formed on the back surface of the housing 1, and an intake ventilation fan 6 and an exhaust ventilation are provided inside the intake hole 4. The fan 7 circulates outside air inside the housing 1 to cool the inside of the panel. Since the air heated inside rises, it is preferable to provide the exhaust hole 5 at a position higher than the intake hole 4. Note that only one of the intake ventilation fan 6 and the exhaust ventilation fan 7 may be provided.

  A box-shaped adapter 8 is attached to the rear surface of the housing 1 by appropriate fixing means such as bolts so as to cover the outside of the intake holes 4 and the exhaust holes 5. The adapter 8 is provided with a partition wall 9 to form an intake chamber 10 and an exhaust chamber 11 so that intake and exhaust are not mixed.

  Sound absorbing ducts 12 and 13 are attached to the side surfaces of the intake chamber 10 and the exhaust chamber 11 of the adapter 8, respectively. In this embodiment, the sound absorbing ducts 12 and 13 are attached to the opposite side surface of the adapter 8, but they may be on the same side. It is also possible to attach the adapter 8 to the upper or lower surface. Intake is performed through the sound absorption duct 12, and exhaust is performed through the sound absorption duct 13. In this embodiment, the sound absorbing ducts are attached to both the intake side and the exhaust side. However, in general, the sound absorption duct can be attached only to the exhaust side having a higher noise level.

  The sound absorbing ducts 12 and 13 are flexible and extendable, and are preferably synthetic resin pipes or metal pipes having a bellows structure. The length is preferably set so that the frequency band of the noise generated from the ventilation fans 6 and 7 can be attenuated to the greatest extent. The frequency band of the noise varies depending on the size of the ventilation fans 6 and 7, the fan structure, and the rotational speed. Therefore, it can be expanded and contracted accordingly.

  Further, since the sound absorbing ducts 12 and 13 are flexible, the direction of the open ends 14 and 15 can be freely changed. Specifically, if the opening ends 14 and 15 are directed downward as shown in FIG. 2, the sound source is directed downward, so that the arrival of noise in the horizontal direction can be suppressed. Also, as shown in FIG. 3, the open ends 14 and 15 can be set sideways or upward, and the direction of the sound source can be freely changed according to the installation conditions of the cabinet.

  Noise reduction by the sound absorbing ducts 12 and 13 basically uses the interference of sound waves. However, if the sound absorbing ducts 12 and 13 have a bellows structure, the internal cross-sectional area changes in the longitudinal direction, which is the same as the muffler. It is possible to reduce noise based on the above principle. Further, if a sound absorbing material layer such as glass wool is formed on the inner surfaces of the sound absorbing ducts 12 and 13 and the adapter 8, the sound absorbing effect can be further enhanced. Further, since noise is also generated through the wall surface of the housing 1, it is preferable to line the sound absorbing material on the inner surface of the housing 1 and to seal the gap with packing or the like in order to prevent leakage of noise from the gap of the opening. Needless to say.

  FIG. 4 is a side view showing a muffler cabinet according to the second embodiment of the present invention, and FIG. 5 is a front view thereof. The same parts as those of the first embodiment described above are denoted by the same reference numerals in the drawings and description thereof is omitted. However, the second embodiment is different in that the sound absorbing ducts 12 and 13 are directly attached to the housing 1. ing. The housing 1 is attached to the wall surface 31. Normally, a louver (not shown) is attached to the intake hole 4 and the exhaust hole 5 of such a cabinet. However, when the sound absorption ducts 12 and 13 are attached, the louver is removed and the sound absorption is made by using the attachment holes. Ducts 12 and 13 can be attached.

  According to the experiment by the inventor, the noise reduction type cabinet of the present invention configured as described above can reduce the noise level by about 5 dB as compared with the conventional cabinet without the sound absorption ducts 12 and 13. Moreover, since the direction of the opening ends 14 and 15 of the sound absorbing ducts 12 and 13 can be changed according to the installation conditions, a larger noise prevention effect can be obtained when installing in a place where there are private houses around. Furthermore, the structure is simple and can be manufactured at low cost, and there is an advantage that it can be easily applied by drilling holes in an existing cabinet.

It is a side view which shows the silencing type | mold cabinet of the 1st Embodiment of this invention. It is a rear view which shows the silence type | mold cabinet of the 1st Embodiment of this invention. It is a rear view which shows another use condition. It is a side view which shows the silencing type | mold cabinet of the 2nd Embodiment of this invention. It is a front view which shows the silencing type | mold cabinet of the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Door 3 Electronic device 4 Intake hole 5 Exhaust hole 6 Ventilation fan 7 Ventilation fan 8 Adapter 9 Bulkhead 10 Intake chamber 11 Exhaust chamber 12 Sound absorption duct 13 Sound absorption duct 14 Open end 15 Open end 31 Wall surface

Claims (3)

  A silencer cabinet characterized in that a flexible sound absorbing duct is attached to at least one of an intake hole and an exhaust hole formed in a housing having a ventilation fan inside.   The sound-absorbing type cabinet according to claim 1, wherein the sound-absorbing duct is provided with a sound-absorbing material on all or part of the inside thereof.   2. The muffler cabinet according to claim 1, wherein the sound absorbing duct has a bellows structure.

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