JPH0550879B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a frame structure for electronic equipment that reduces the noise of electronic equipment that requires forced air cooling.

[Conventional technology]

Conventionally, as a rack structure for this type of electronic equipment, for example, a unit having an electronic circuit package is mounted inside the rack, and an exhaust duct is provided on the air outlet side of a blower arranged to cool the unit. In most cases, sound-absorbing material was attached to the internal side walls of the building to prevent noise from leaking outside.

[Problems to be resolved]

In the conventional electronic equipment rack structure mentioned above,
The structure is such that an exhaust duct covered with sound-absorbing material is placed on the air outlet side of a blower prepared to cool the unit containing the electronic circuit package mounted inside the rack. It is not possible to obtain an average noise attenuation effect up to high frequencies, and the heat density of electronic circuit packages has also increased as devices have become more integrated and faster.
This results in a lack of capacity of the blower, and in order to solve this problem, a large number of large blowers are installed to compensate for the lack of capacity, resulting in problems such as increased noise. For this reason, in the prior art, it is difficult to reduce the noise without increasing the pressure loss of the blower.

[Means for solving problems]

The present invention aims to provide a rack structure for electronic equipment that can prevent noise generated by a blower provided for cooling mounted units in the rack from leaking to the outside.

Therefore, in a rack structure for electronic equipment that requires forced air cooling, the present invention provides an air blower installed on the air outlet side of a blower located at least on one side of a unit having an electronic circuit package mounted in the rack. an exhaust duct, at least one hollow resonance chamber provided in the side wall of the exhaust duct and communicating with the exhaust duct through a through hole formed in the side wall of the exhaust duct, and a plate pasted with the sound absorbing material. The present invention provides a rack structure for electronic equipment characterized by having sound absorbing boxes arranged in a slit shape at predetermined intervals to form a box shape and provided continuously to an exhaust port of an exhaust duct.

〔Example〕

FIG. 1 is a side sectional view of an embodiment of the present invention,
Unit 1 having an electronic circuit package in frame 6
are installed in two stages, with blowers 2 above and below unit 1.
A rectifying grid 7 is interposed between the unit 1 and the blower 2, and a rectifying grid 7 is interposed between the unit 1 and the blower 2 in order to uniformize the flow of air from the blower 2 and increase cooling efficiency. An air filter 8 is provided to prevent dust from entering the rack.
Furthermore, a hollow resonance chamber 4 is provided on the air outlet side of the blower 2. In this embodiment, four cavity resonance chambers 4 are connected to the exhaust duct 3 and arranged, and the joint between the exhaust duct 3 and the cavity resonance chamber 4 is located on the side wall of the exhaust duct 3 as shown in FIGS. 2 and 3. Through hole 5 provided in
are connected by. Furthermore, a sound absorbing box 1 is constructed in a box-like configuration in which plates 9 on which sound absorbing material 10 is pasted are arranged in slits at predetermined intervals on the exhaust side of the exhaust duct 3.
1 is provided. Therefore, in this embodiment, the peak of the noise generated by the blower 2 is attenuated in the cavity resonance chamber 4, and the reflected sound on the exhaust side and the high frequency range are further attenuated in the sound absorption box 11.

〔Effect of the invention〕

As explained above, the present invention provides a method for discharging air from a blower placed at least on one side of a unit having an electronic circuit package mounted in the rack in a rack structure for electronic equipment that requires forced air cooling. an exhaust duct provided on the side; at least one cavity resonance chamber provided in the side wall of the exhaust duct and communicating with the exhaust duct through a through hole formed in the side wall of the exhaust duct; and the sound absorbing material. The rack structure for electronic equipment is characterized by having a box-shaped structure in which the mounting plates are arranged in slits at predetermined intervals, and a sound-absorbing box that is connected to the exhaust port of the exhaust duct. By matching the peak frequency of the noise generated by the blower that cools the unit with the mounted electronic circuit package to the resonance frequency of the cavity resonance chamber connected to the exhaust duct,
By attenuating the peak of the noise generated by the blower and increasing the number of cavity resonance chambers, it is possible to widen the range of resonance frequencies, and it is possible to attenuate noise over a wider range.

Furthermore, the noise box provided on the exhaust port side of the exhaust duct can attenuate the reflected sound on the exhaust port side and noise in the high frequency range, which has the effect of realizing low noise that corresponds to high integration.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view showing an exhaust duct and a cavity resonance chamber of the present invention, and FIG. 3 is a longitudinal cross-section of FIG. It is a diagram. 1...Unit, 2...Blower, 3...Exhaust duct, 4...Cavity resonance chamber, 5...Through hole, 6...
Frame, 9... Board, 10... Sound absorbing material, 11... Sound absorbing box.

Claims (1)

[Claims] 1. In a rack structure for electronic equipment that requires forced air cooling, an exhaust duct provided on the air outlet side of a blower located at least on one side of a unit with an electronic circuit package mounted in the rack. , at least one hollow resonance chamber provided in the side wall of the exhaust duct and communicating with the exhaust duct through a through hole formed in the side wall of the exhaust duct, and a plate to which the above-mentioned sound absorbing material is attached at a predetermined interval. 1. A rack structure for electronic equipment, comprising a sound absorbing box which is arranged in a slit shape and formed into a box shape, and which is connected to an exhaust port of an exhaust duct.