JP2011082225A - Silencer and silencing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance a silencing performance at a lower cost. <P>SOLUTION: A ventilation unit 133 has an intake passage and an exhaust passage as different passages. The ventilation unit 133 also has a two-step structure where the intake passage and exhaust passage are divided by a partition 134 with each passage turned up by 180 degrees, and a sufficient numerical aperture (width) is assured at the intake passage or exhaust passage. The intake passage and exhaust passage are provided at a distance from each other. The ventilation unit 133 is provided on an electronic apparatus 121 in order to avoid penetration of dust or the like, from the intake passage or exhaust passage and to lower the center of gravity. The invention is applicable, for example, to a silencer. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a noise reduction apparatus and method, and more particularly to a noise reduction apparatus and method that can improve the noise reduction performance at a lower cost.

  In recent years, with the improvement of information processing technology, the performance of electronic devices has been improved. In particular, high-performance servers for business use, for example, have been highly integrated to improve computing power, and although the total heat generation of internal devices such as CPU (Central Processing Unit) and memory tends to increase, In order to save space, the device itself is becoming smaller.

  Therefore, in such a high-performance electronic device, it is necessary to improve the internal cooling function. Therefore, a fan having higher ventilation capacity has been used as a fan for ventilation. However, there is a concern that the operation sound (noise and vibration) generated in the electronic device may increase.

  If the operation sound becomes too loud, there is a risk that the installation location of the electronic device will be restricted.

  In view of this, a silencer (such as a box or a unit) that reduces operation noise generated in an electronic device has been considered (see, for example, Patent Documents 1 to 3).

JP 2008-115807 A JP 2008-21815 A JP 2006-228924 A

  However, for example, in a conventional noise reduction device, the noise reduction performance may not be sufficient, and further enhancement of performance has been demanded. However, if a fan is provided or a silencer is provided, the cost may increase unnecessarily.

  The present invention has been proposed in view of such a situation, and an object thereof is to improve the noise reduction performance at a lower cost.

  One aspect of the present invention stores an electronic device having a ventilation function inside a housing, reduces the operation sound of the device, and includes an intake port for sucking outside air and an exhaust port for discharging inside air to the outside. Provided above the position of the electronic device of the housing, outside air is naturally aspirated from the intake port and supplied to the intake port of the electronic device, and the inside air exhausted from the exhaust port of the electronic device is supplied to the exhaust port It is a silencer that supplies and exhausts naturally through the exhaust port.

  A ventilation unit having an intake passage for supplying outside air naturally sucked from the intake port to an intake port of the electronic device, and an exhaust passage for supplying inside air exhausted from an exhaust port of the electronic device to the exhaust port; It can be provided above the electronic device inside the housing.

  The intake passage and the exhaust passage may form a multistage structure above the electronic device, and may be folded back in opposite directions by both surfaces of a common partition member.

  The partition member may be a vibrating thin film.

  The position of the partition member may be variable.

  Detection means for detecting the sound volume in the vicinity of the intake port and the exhaust port, drive means for controlling the position of the partition member, the drive means, and based on the sound volume detected by the detection means Control means for determining the position of the partition member can be further provided.

  A shock absorbing material that absorbs shock and vibration can be provided inside the housing.

  A sound absorbing material for absorbing sound can be provided inside the intake passage and the exhaust passage.

  A plurality of the electronic devices can be stored inside the housing.

  A partition member that partitions the inside of the housing into an intake side and an exhaust side can be provided at a location where the electronic device is not installed inside the housing.

  According to another aspect of the present invention, an electronic device having a ventilation function is housed in a housing, the operation sound of the device is reduced, an intake port for sucking outside air, and an exhaust port for discharging inside air to the outside Is provided above the position of the electronic device in the housing, and is further exhausted from an intake passage that supplies outside air sucked from the intake port to the intake port of the electronic device, and an exhaust port of the electronic device. An exhaust path for supplying inside air to the exhaust port forms a multistage structure above the electronic device, and a ventilation unit that is folded back in opposite directions by both surfaces of a common partition member made of a vibrating thin film, In the silencer provided above the internal electronic device, the sound volume in the vicinity of the air inlet and the air outlet is detected, the position of the partition member is controlled, and the sound volume is detected based on the detected sound volume. A noise reduction method for determining the installation position of the partition member.

  In one aspect of the present invention, the sound volume in the vicinity of the air inlet and the air outlet is detected, and the installation position of the partition member is determined based on the detected sound volume.

  According to the present invention, it is possible to reduce the operation sound of an electronic device. In particular, the noise reduction performance can be improved at a lower cost.

It is a perspective view of a noise reduction device to which the present invention is applied. It is the perspective view from the other angle of the noise reduction apparatus of FIG. It is sectional drawing of the noise reduction apparatus of FIG. It is sectional drawing of the noise reduction apparatus of FIG. It is a figure explaining the example of the mode of attachment or detachment of an electronic device. It is sectional drawing explaining the other example of the noise reduction apparatus to which this invention is applied. It is sectional drawing explaining the further another example of the noise reduction apparatus to which this invention is applied. It is sectional drawing explaining the further another example of the noise reduction apparatus to which this invention is applied. It is sectional drawing explaining the further another example of the noise reduction apparatus to which this invention is applied. It is a flowchart explaining the example of the flow of a thin film position adjustment process. It is a perspective view of a server rack to which the present invention is applied. It is a front view of the server rack to which this invention is applied. It is sectional drawing of the server rack to which this invention is applied. It is a block diagram which shows the structural example of the personal computer to which this invention is applied.

Hereinafter, modes for carrying out the invention (hereinafter referred to as embodiments) will be described. The description will be given in the following order.
1. First embodiment (silencer)
2. Second embodiment (silencer)
3. Third embodiment (server rack)
4). Fourth embodiment (personal computer)

<1. First Embodiment>
[appearance]
FIG. 1 shows a configuration of an embodiment of a silencer to which the present invention is applied.

  A silencer 100 shown in FIG. 1 is an apparatus that stores an electronic device such as a server inside a substantially rectangular parallelepiped housing and reduces its operating sound (absorbs operating sound leaking outside).

  As shown in FIG. 1, the housing of the silencer 100 is configured by a main body 101, a lid 102, and a lid 103. The lid portion 102 and the lid portion 103 are configured to be detachable from the main body portion 101, respectively. Hereinafter, the surface 100A on the lid 102 side is referred to as a front surface (front surface 100A), the surface 100B is referred to as an upper surface (upper surface 100B), and the surface 100C is referred to as a right surface (right side surface 100C).

  On the upper side of the front surface 100A of the lid portion 102, an intake port lid 104 is provided for closing an intake port, which will be described later, when not operating. FIG. 1 shows a state in which the intake port lid 104 is closed. In operation, the inlet lid 104 is opened as indicated by the arrow.

  In addition, an operation window lid 105 for closing an operation window used when operating an electronic device stored therein is provided below the front surface 100 </ b> A of the lid 102. The operation window lid 105 is provided so as to be detachable from the lid 102 as indicated by a double arrow. When the operation window lid 105 is removed from the lid 102, an operation window leading to the inside is formed. The user can operate the internal electronic device through the operation window. However, if the operation window cover 105 is removed and the operation window is opened, the operation sound leaks from the operation window, and the noise reduction performance of the noise reduction device 100 is reduced. Therefore, the operation window lid 105 is basically attached to the lid 102 and is removed only when necessary.

  FIG. 2 is a perspective view from another angle of the silencer of FIG. In the following, the surface 100D on the lid 103 side is referred to as a back surface (back surface 100D).

  On the upper side of the back surface 100D of the lid portion 103, an exhaust port lid 106 for closing an exhaust port described later when not in operation is provided. In operation, the inlet lid 104 is opened as indicated by the arrow. FIG. 3 shows a state in which the exhaust port lid 106 is opened.

  The intake port cover 104 in FIG. 1 and the exhaust port cover 106 in FIG. 2 are basically configured in the same manner except that the place where the intake port cover is provided is an intake port or an exhaust port, and perform the same operation. That is, the intake port cover 104 and the exhaust port cover 106 are closed as shown in FIG. 1 when not operating, and are opened as shown in FIG. 2 when operating.

  The intake port is basically configured similarly to the exhaust port. That is, when the intake port lid 104 of FIG. 1 is opened, the intake port opens like the exhaust port of FIG.

  Further, a wiring window which is a window for wiring the cable of the electronic device stored inside to the outside of the housing is provided on the lower side of the back surface 100D of the lid 103, and the wiring window is shown in FIG. A wiring window lid 107 is provided as shown. The wiring window lid 107 is opened and closed in the rotational direction as indicated by a double arrow, similarly to the intake port lid 104 and the exhaust port cover 106.

  However, in the case of the intake port lid 104 and the exhaust port cover 106, the hinge portion is provided below the intake port and the exhaust port, and they are opened downward. On the other hand, the wiring window lid 107 has a hinge portion provided on the upper side of the wiring window and is opened upward. Thereby, in the state where the cable of the electronic device is wired outside through the wiring window, the wiring window lid 107 can be easily closed as much as possible only by the weight of the wiring window lid 107 itself. The aperture ratio of the window can be minimized. Thereby, it can suppress that an operating sound leaks outside from a wiring window.

  In addition, the shape of a housing is arbitrary.

[Internal configuration]
FIG. 3 is a cross-sectional view seen from the front 100A side when the noise reduction device 100 of FIG. 1 is cut as indicated by a dotted double arrow 111. FIG. In FIG. 3, the left surface 100E of the noise reduction device 100 facing the right side surface 100C in the drawing is referred to as the left side surface (left side surface 100E), and the lower surface 100F in the drawing facing the upper surface 100B is the lower surface (lower surface 100F). ).

  As shown in FIG. 3, the electronic device 121 is installed inside the housing 131. A buffer material 132 is provided on the inner surface of the housing 131, and the electronic device 121 is installed in a space surrounded by the buffer material 132.

  As a material of the casing 131, for example, wood, plastic, metal such as iron or copper, or alloy such as duralumin can be considered. Of course, other materials may be used. However, it is desirable that the casing 131 has sufficient strength.

  The buffer material 132 is a member that protects the electronic device 121 from external vibration, impact, and the like, and suppresses the vibration of the electronic device 121 itself and conduction of operation sound to the outside (leakage due to resonance of the housing 131 and the like). . That is, the cushioning material 132 also serves as a soundproofing material. Examples of the material of the cushioning material 132 include paper, cloth, wool, feathers, rubber, polystyrene foam, foam cushioning material, gelled material, glass wool, or a sponge such as urethane. Of course, other materials may be used.

  A ventilation unit 133 is provided on the electronic device 121. The ventilation unit 133 has a ventilation path that induces an airflow by intake or exhaust. In the drawing, a portion of the ventilation unit 133 indicated by the hatched pattern is a cavity, and this cavity serves as a ventilation path and guides the airflow in a predetermined direction. As shown in FIG. 3, the ventilation path of the ventilation unit 133 has a two-stage configuration in the vertical direction. Details will be described later.

  As shown in FIG. 3, the left and right directions perpendicular to the right side surface 100C and the left side surface 100E and the vertical direction perpendicular to the upper surface 100B and the lower surface 100F of the electronic device 121 and the ventilation unit 133 installed in the housing 131. Is filled with a cushioning material 132 so that there is basically no gap.

  This is intended to stably fix the electronic device 121 and the ventilation unit 133 and to separate the front (front side) space and the rear (back side) space of the electronic device 121.

  4 is a cross-sectional view seen from the right side surface 100C side when the noise reduction device 100 of FIG. 1 is cut as indicated by a dotted double arrow 112. FIG.

  As shown in FIG. 4, the cushioning material 132 is basically provided on the inner surface of the front surface 100 </ b> A of the housing 131 and the inner surface of the rear surface 100 </ b> D except for the intake port, the exhaust port, and the wiring window. A buffer material 132 is also provided on the inner surface of the operation window lid 105.

  However, a predetermined gap is provided between the electronic device 121 installed inside the housing 131 and the cushioning material 132 around the front and rear direction perpendicular to the front surface 100A and the back surface 100D.

  As shown in FIG. 4, the interior of the ventilation unit 133 is divided into two spaces (two paths of ventilation paths (that is, an intake path and an exhaust path)) in the front-rear direction by a partition 134. As described above, the space on the front surface 100A side of the electronic device 121 and the space on the back surface 100D side of the electronic device 121 are also divided.

  The outside air naturally aspirated from the intake port is supplied (induced) to the space on the front 100A side of the electronic device 121 through the intake path in front of the partition 134 inside the ventilation unit 133 as indicated by an arrow. The The electronic device 121 has a ventilation function, and an air inlet 122 is provided on the side surface of the electronic device 121 on the front surface 100 </ b> A side.

  That is, the outside air that is naturally aspirated from the intake port is an intake path that is configured by a space in front of the partition 134 inside the ventilation unit 133 and a space on the front side 100A of the electronic device 121, which is indicated by a hatched pattern in the upper right and lower left. Thus, the air is supplied (guided) to the air inlet 122 and supplied (inducted) from the air inlet 122 into the electronic device 121.

  A noise source 124 such as a ventilation fan is present inside the electronic device 121 having a ventilation function. The noise source 124 may be any type as long as an operation sound is generated. Inside the electronic device 121, for example, an air flow is generated from the front surface 100 </ b> A side to the rear surface 100 </ b> D side by a ventilation fan or the like serving as a noise source 124 as indicated by a dotted line in the drawing.

  That is, the outside air taken in from the intake port 122 passes through the electronic device 121, cools the electronic component that is a heat source in the electronic device 121 (as the inside air), and the side surface of the electronic device 121 on the back surface 100 </ b> D side. Is exhausted to the space on the back surface 100D side of the electronic device 121 from the exhaust port 123 provided in the electronic device 121.

  The inside air is further supplied (guided) to the exhaust port through the exhaust passage inside the ventilation unit 133 and behind the partition 134 as shown by the arrow, and is naturally exhausted from the exhaust port of the silencer 100. The

  That is, the airflow exhausted from the exhaust port 123 of the electronic device is represented by a diagonal line pattern in the upper right and lower left in the space behind the partition 134 inside the ventilation unit 133 and the space on the back surface 100D side of the electronic device 121. It is supplied (guided) to the exhaust port of the noise reduction device 100 by the configured exhaust path.

  Thus, the ventilation unit 133 has an intake passage and an exhaust passage that are different from each other. Thereby, fresh (low-temperature) intake air can be prevented from interfering with high-temperature exhaust gas, and outside air can be taken into the electronic device 121 at a low temperature. Thereby, the cooling efficiency of the electronic device 121 can be improved.

  Further, the ventilation unit 133 has a multistage (two-stage) structure in which the intake path and the exhaust path are partitioned by a partition 134 that is a common member, and each path is folded 180 degrees (in the opposite direction) by both surfaces of the partition member. The longest possible route is secured by making the best use of space. At the same time, the ventilation unit 133 ensures a sufficient opening ratio (width) at the intake port and the exhaust port as shown in FIGS. 1 and 2.

  In other words, the ventilation unit 133 has a simpler structure and a longer and wider ventilation path. Cost can be suppressed by simplifying the structure. Further, by making the ventilation path longer, sound leakage from the intake port and the exhaust port can be further suppressed. Furthermore, since the ventilation path is folded, sound leakage is further suppressed.

  Furthermore, the ventilation volume can be increased by making the ventilation path (intake port and exhaust port) wider. That is, the ventilation unit 133 can further improve the noise reduction performance and increase the ventilation performance without unnecessarily increasing the cost.

  In addition, the noise reduction apparatus 100 can perform intake / exhaust only by the ventilation function of the electronic device 121 as shown in FIG. 4 by improving the ventilation performance. That is, the silencer 100 can sufficiently cool the electronic device 121 only by performing natural intake and natural exhaust. Thereby, since it is not necessary to provide equipment such as a fan for intake or exhaust in the silencer 100, the silence performance of the silencer 100 can be further improved. In addition, since the number of parts can be reduced, the cost can also be reduced.

  As shown in FIG. 4, the ventilation unit 133 is provided on the electronic device 121. That is, the electronic device 121 is installed below the ventilation unit 133.

  In general, the electronic device 121 is heavier than the ventilation unit 133. Therefore, by installing the electronic device 121 below the ventilation unit 133, the center of gravity becomes lower than when the electronic device 121 is installed above the ventilation unit 133, and thus the stability of the silencer 100 is improved. .

  Further, the ventilation unit 133 is disposed above the electronic device 121, and the intake port and the exhaust port are provided on the upper side of the silencer 100, thereby further suppressing the intrusion of dust and the like from the intake port and the exhaust port. be able to.

  Further, as shown in FIG. 4, by providing the intake port and the exhaust port at positions separated from each other, interference between the intake and exhaust outside the silencer 100 can be suppressed, and the cooling efficiency of the electronic device 121 can be reduced. Can be improved.

  FIG. 5 is a diagram illustrating an example of how an electronic device is attached and detached.

  The electronic device 121 can be taken out or installed by removing the lid 102 or the lid 103 of the silencer 100 from the main body 101. In the example of FIG. 5, the lid 102 is removed from the main body 101. In this state, as shown by the arrow 141, the electronic device 121 can be easily taken out from the silencer 100 by pulling it out to the front 100A side. On the contrary, the electronic device 121 can be easily installed inside the noise reduction apparatus 100 by pushing the electronic device 121 toward the back surface 100D side.

  Even when the lid 103 is removed from the main body 101, the electronic device 121 can be easily removed from the silencer 100 or installed inside the silencer 100 by the same operation. .

[Modification]
In the silencer 100 described above, a sound absorbing material or a cushioning material may be provided in the above-described ventilation path, the inside of the housing 131, or the like. FIG. 6 is a cross-sectional view for explaining another example of the silencer to which the present invention is applied.

  In the case of the example shown in FIG. 6, in order to protect the electronic device 121 in the silencer 100, the minimum necessary amount is below the electronic device 121 and between the electronic device 121 and the ventilation unit 133. The buffer materials 152-1 to 152-4 are provided. In addition, in the silencer 100, the sound absorbing materials 151-1 to 151-3 and the sound absorbing materials 151-6 to 151-8 are laid in the ventilation path. Further, the sound absorbing material 151-4 and the sound absorbing material 151-5 are also spread in the gap below the electronic device 121.

  Further, the cushioning material 152-5 and the cushioning material 152-6 are also provided on the front surface 100A and the rear surface 100D outside the housing 131 of the noise reduction device 100.

  The sound absorbing material 151-1 to 151-8 are referred to as the sound absorbing material 151 when there is no need to distinguish between them. In addition, when it is not necessary to distinguish between the cushioning materials 152-1 to 152-6, the cushioning materials 152-1 to 152-6 are referred to as cushioning materials 152.

  The sound absorbing material 151 is a member that suppresses reflection of sound. Examples of the material include paper, cloth, wool, feathers, rubber, polystyrene foam, foam cushioning material, gelled material, glass wool, sponge such as urethane, and the like. Of course, other materials may be used.

  The cushioning material 152 is a member similar to the cushioning material 132.

  Thus, the silencer 100 can suppress sound leakage from the intake port or the exhaust port by disposing the sound absorbing material in the ventilation path. In addition, vibrations and operation sounds generated in the electronic device 121 are generally transmitted to the housing 131 of the silencer 100. Therefore, by providing the cushioning material 152 (or the sound absorbing material 151) outside the housing 131 of the noise reduction device 100, the noise reduction performance of the noise reduction device can be improved.

  The sound absorbing material 151 may have a buffering performance. That is, the sound absorbing material 151 and the buffer material 152 may not be distinguished from each other.

  Further, the intake port and the exhaust port are desirably located above the silencer 100 as described above, but can be basically provided at any position. For example, as in the case of the ventilation unit 161 shown in FIG. 7A, an intake port and an exhaust port may be provided on the upper surface 100B. Further, the shape and size of the intake and exhaust ports are arbitrary, and the shape and size of the intake and exhaust ports may be different from each other as in the case of the ventilation unit 161 shown in FIG. 7A. . Of course, the shapes and paths of the intake and exhaust paths may not be the same (symmetric) as in the ventilation unit 161 shown in FIG. 7A.

  Further, as shown in FIG. 7B, the ventilation path of the ventilation unit may be three or more stages. In the case of the example of FIG. 7B, the ventilation path has a four-stage configuration. By doing so, the path length of the ventilation path can be increased, but if the size of the ventilation path is unchanged, for example, the size of the ventilation unit increases accordingly.

  Further, as shown in FIG. 7C, the ventilation unit may have four stages, of which the upper two stages may be an exhaust path and the lower two stages may be an intake path. By doing in this way, the intake air whose temperature is lower than that of the exhaust can be guided in the vicinity of the electronic device 121, and the electronic device 121 can be cooled from the outside (a reduction in cooling performance can be suppressed). ).

<2. Second Embodiment>
[Internal configuration]
FIG. 8 is a cross-sectional view for explaining still another example of the silencer to which the present invention is applied.

  As shown in FIG. 8, a thin film 181 may be provided instead of the partition 134 described with reference to FIG.

  The thin film 181 is a member that vibrates due to an operating sound of the electronic device 121. The material of the thin film 181 can be, for example, paper, cloth, cellophane, or the like. Of course, materials other than these may be used.

  The thin film 181 is vibrated by both sound transmitted through the intake passage (arrow 191) and sound transmitted through the exhaust passage (arrow 192). By providing the thin film 181 at a position where the wavelengths of the sound transmitted through the intake passage and the sound transmitted through the exhaust passage are deviated from each other by a half wavelength, the sounds cancel each other. It is possible to further suppress sound leakage from the intake port and the exhaust port. That is, the noise reduction performance can be improved at a lower cost.

  The position where the sound transmitted through the intake passage and the sound transmitted through the exhaust passage cancel each other is determined based on various factors such as the position of the noise source 124. Therefore, the position of the thin film 181 can be made variable so that the user can place the thin film 181 at the position where the silent effect is the highest in accordance with the electronic device 121 installed in the silencer 100 or the like. Good.

[Modification]
Furthermore, a sensor is provided in the vicinity of the intake and exhaust ports of the silencer 100, and the silencer 100 can control the position of the thin film 181 so that sound leakage from the intake and exhaust ports is minimized. You may do it.

  FIG. 9 is a cross-sectional view for explaining still another example of the silencer to which the present invention is applied.

  In the case of the example of FIG. 9, the thin film 181 of the silencer 100 is provided on the base 201 and the base 202 that are movable in the front-rear direction along the ventilation path of the ventilation unit 133. The silencer 100 further includes a control unit 211, a sensor unit 212, a sensor unit 213, and a drive unit 214.

  The control unit 211 controls the position of the drive unit 214 based on the sensor outputs of the sensor unit 212 and the sensor unit 213. The sensor unit 212 includes a sensor that senses sound, such as a microphone, provided near the air inlet of the silencer 100. The sensor unit 212 detects the volume of the sound leaking from the intake port and notifies the control unit 211 of the information. The sensor unit 213 is the same sensor as the sensor unit 212, is installed near the exhaust port, detects the volume of sound leaking from the exhaust port, and notifies the control unit 211 of the information.

  The control unit 211 controls the driving unit 214 based on the sensor outputs supplied from the sensor unit 212 and the sensor unit 213, that is, the sound volume (noise level) leaking from the intake port and the exhaust port. The thin film 181 is moved to the minimum position.

  The drive unit 214 is controlled by the control unit 211 to move the base 201 and the base 202 in the front-rear direction along the ventilation path of the ventilation unit 133.

[Process flow]
An example of the flow of such thin film position adjustment processing will be described with reference to the flowchart of FIG.

  When the thin film position adjustment process is started, in step S101, the sensor unit 212 and the sensor unit 213 measure noise levels at the respective positions. In step S102, the control unit 211 stores the measurement result obtained in step S101.

  The noise level is measured while moving the thin film 181. That is, within the movable range of the thin film 181, a plurality of positions (points) are determined in advance, and the above-described noise level measurement is performed in a state where the thin film 181 is positioned at each point.

  In step S103, the control unit 211 determines whether measurement has been performed at all points. If it is determined that there is still a point whose noise level has not been measured, the process proceeds to step S104.

  In step S104, the drive unit 214 moves the thin film 181 by a predetermined amount to move to the next point. When the process of step S104 ends, the process returns to step S101 and the subsequent processes are repeated.

  In step S103, the thin film 181 is moved to all points, and when it is determined that the measurement of the noise level is completed at each point, the process proceeds to step S105. In step S <b> 105, the control unit 211 specifies a position where the measurement result is minimum based on the stored measurement result of each point. In step S106, the control unit 211 controls the drive unit 214 to move the thin film 181 to the specified position.

  When the process of step S106 ends, the thin film position adjustment process ends.

  Thus, by adjusting the position of the thin film 181 according to the volume of the sound leaking from the intake port and the exhaust port, the silencer 100 can easily improve the noise reduction performance. In addition, since the number of components required for this control is small and general, and the control content is simple, the noise reduction device 100 can improve the noise reduction performance at a lower cost.

<3. Third Embodiment>
[appearance]
Note that the number of electronic devices installed in the silencer is arbitrary, and a plurality of electronic devices may be installed.

  FIG. 11 is a perspective view of a server rack to which the present invention is applied.

  A server rack 300 shown in FIG. 11 is a rack capable of fixing a plurality of servers, and, like the silencer 100, suppresses noise generated from the installed server and has a sufficient ventilation function.

  As in the case of the silencer 100, the surface 300A of the server rack 300 is referred to as the front surface (front surface 300A), the surface 300B is referred to as the upper surface (upper surface 300B), and the surface 300C is referred to as the right side surface (right side surface 300C).

  The front door 301 is provided with a front door 301. The front door 301 is opened when the front door 301 is opened, and the server can be installed inside through the opening. Inside the server, a plurality of servers can be installed so as to be stacked vertically.

  Inside the server rack 300, there is provided a partition 311 that can be opened and closed with respect to the position where each server can be installed. The partition 311 is closed when the server is not installed, and is opened when the server is installed. By this partition 311, the space inside the server rack 300 is simply partitioned into a front space and a rear space of the partition 311.

  In addition, a ventilation unit is provided on the upper side of the interior as described later, and an intake port 302 is provided on the upper side of the front surface 300A at a position corresponding to the ventilation unit. That is, the air inlet 302 is disposed above the server installed inside the server rack 300.

  FIG. 12 is a front view of a server rack to which the present invention is applied.

  As shown in FIG. 12, a plurality of partitions 311 are arranged in the server rack 300 corresponding to the installation positions of the servers as described above. For example, in the case of the example of FIG. 12, the server rack 300 can install nine servers in the vertical direction. In the example of FIG. 12, the server 321-2 is installed in the second stage from the bottom, the server 321-4 is installed in the fourth stage from the bottom, and the server 321-5 is installed in the fifth stage from the bottom. ing.

  The servers 321 are referred to when it is not necessary to distinguish between the servers. In FIG. 12, the partition 311 is open at the second, fourth, and fifth stages from the bottom where the server 321 is installed, but the other stages are closed.

  For example, the partition 311-1-L and the partition 311-1-R are provided in the first row from the bottom, and the space inside the server rack 300 is partitioned in the front-rear direction in the closed state. Similarly, a partition 311-3-L and a partition 311-3-R are provided in the third row from the bottom, and partition the space inside the server rack 300 in the front-rear direction in the closed state. Similarly, a partition 311-6-L and a partition 311-6-R are provided in the sixth row from the bottom, and partition the space inside the server rack 300 in the front-rear direction in the closed state. Similarly, a partition 311-7-L and a partition 311-7-R are provided in the seventh row from the bottom, and partition the space inside the server rack 300 in the front-rear direction in the closed state. Similarly, a partition 311-8-L and a partition 311-8-R are provided in the eighth row from the bottom, and partition the space inside the server rack 300 in the front-rear direction in the closed state. Similarly, a partition 311-9-L and a partition 311-9-R are provided on the ninth stage from the bottom, and partition the space inside the server rack 300 in the front-rear direction in the closed state.

[Internal configuration]
FIG. 13 is a cross-sectional view of the server rack 300 to which the present invention is applied, cut in the front-rear direction and viewed from the right side surface 300C. A surface 300D facing the front surface 300A is referred to as a back surface (back surface 300D).

  As shown in FIG. 13, a back door 331 is provided on the back surface 300D. The back surface 300D also has an opening similar to that of the front surface 300A, and the back door 331 closes the opening in a closed state. By opening the back door 331, an opening is formed in the back surface 300D. Therefore, the user can easily install the server 321 and perform wiring through the opening.

  In addition, a ventilation unit 341 similar to the ventilation unit 133 in the case of the silencer 100 is provided in the upper part of the server rack 300. An exhaust port 332 is provided at a position corresponding to the ventilation unit 341 above the rear surface 300D.

  In other words, in the server rack 300, air is sucked from the air inlet 302 on the front surface 300A and exhausted from the air outlet 332 on the rear surface 300D. Inside the server rack 300, the stage where the server 321 is not installed is partitioned by a partition 311.

  On the other hand, the server 321 takes in air from the front side and exhausts from the rear side. As shown in FIG. 13, the server 321-2 is installed in the second row from the bottom, and the partition 311-2-R is opened by the server 321-2. The same applies to the fourth and fifth stages.

  That is, the outside air sucked into the server rack 300 from the intake port on the front surface 300 </ b> A is discharged from the exhaust port on the rear surface 300 </ b> D via the inside of the installed server 321.

  Thus, by partitioning the stage where the server is not installed with the partition 311, the server rack 300 can divide the internal space into the intake side and the exhaust side, and the ventilation function of each server can be improved. .

  Of course, the ventilation unit 341 has an intake path and an exhaust path as mutually different paths, as in the case of the ventilation unit 133. Thereby, the cooling efficiency of the electronic device 121 can be improved.

  In addition, since the ventilation unit 341 has the same configuration as the ventilation unit 133, as in the case of the ventilation unit 133, the noise reduction performance is further improved and the ventilation performance is further improved without increasing the cost unnecessarily. Can be made.

  Further, the server rack 300 installs the intake port 302 and the exhaust port 332 at a position higher than the installation position of the server 321. As a result, the center of gravity is lowered, so that the stability of the server rack 300 is improved and the intrusion of dust and the like from the air inlet 302 and the air outlet 332 can be further suppressed.

  Furthermore, by providing the intake port 302 and the exhaust port 332 at positions separated from each other, interference between the intake and exhaust outside the server rack 300 can be suppressed, and the cooling efficiency of the server 321 can be improved.

<4. Fourth Embodiment>
[Constitution]
[Personal computer]
The series of processes described above can be executed by hardware or can be executed by software. In this case, for example, it may be configured as a personal computer as shown in FIG.

  14, the CPU 401 of the personal computer 400 executes various processes according to a program stored in a ROM (Read Only Memory) 402 or a program loaded from a storage unit 413 to a RAM (Random Access Memory) 403. The RAM 403 also appropriately stores data necessary for the CPU 401 to execute various processes.

  The CPU 401, ROM 402, and RAM 403 are connected to each other via a bus 404. An input / output interface 410 is also connected to the bus 404.

  The input / output interface 410 includes an input unit 411 including a keyboard and a mouse, a display including a CRT (Cathode Ray Tube) and an LCD (Liquid Crystal Display), an output unit 412 including a speaker, and a hard disk. A communication unit 414 including a storage unit 413 and a modem is connected. The communication unit 414 performs communication processing via a network including the Internet.

  A drive 415 is connected to the input / output interface 410 as necessary, and a removable medium 421 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory is appropriately mounted, and a computer program read from them is It is installed in the storage unit 413 as necessary.

  When the above-described series of processing is executed by software, a program constituting the software is installed from a network or a recording medium.

  For example, as shown in FIG. 14, the recording medium is distributed to distribute the program to the user separately from the apparatus main body, and includes a magnetic disk (including a flexible disk) on which the program is recorded, an optical disk ( It is only composed of removable media 421 consisting of CD-ROM (compact disc-read only memory), DVD (including digital versatile disc), magneto-optical disc (including MD (mini disc)), or semiconductor memory. Rather, it is composed of a ROM 402 on which a program is recorded and a hard disk included in the storage unit 413, which is distributed to the user in a state of being incorporated in the apparatus main body in advance.

  Note that the program executed by the computer may be a program that is processed in time series in the order described in this specification, or in parallel or at a necessary timing such as when a call is made. It may be a program for processing.

  Further, in the present specification, the step of describing the program recorded on the recording medium is not limited to the processing performed in chronological order according to the described order, but may be performed in parallel or It also includes processes that are executed individually.

  Further, in this specification, the system represents the entire apparatus composed of a plurality of devices (apparatuses).

  In addition, in the above, the configuration described as one device (or processing unit) may be divided and configured as a plurality of devices (or processing units). Conversely, the configurations described above as a plurality of devices (or processing units) may be combined into a single device (or processing unit). Of course, a configuration other than that described above may be added to the configuration of each device (or each processing unit). Furthermore, if the configuration and operation of the entire system are substantially the same, a part of the configuration of a certain device (or processing unit) may be included in the configuration of another device (or other processing unit). . That is, the embodiment of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  DESCRIPTION OF SYMBOLS 100 Silencer, 121 Electronic device, 122 Inlet, 123 Exhaust, 124 Noise source, 131 Housing, 132 Buffer, 133 Ventilation unit, 134 Partition, 181 Thin film, 211 Control part, 212 Sensor part, 213 Sensor part, 214 drive unit, 300 server rack, 311 partition, 321 server, 341 ventilation unit

Claims (11)

An electronic device having a ventilation function is housed inside the housing, the operation sound of the device is reduced, and an intake port for sucking outside air and an exhaust port for exhausting inside air to the outside are provided in the electronic device of the housing The outside air is naturally sucked from the air intake and supplied to the air intake of the electronic device, and the internal air exhausted from the air outlet of the electronic device is supplied to the air exhaust. Silencer that exhausts naturally. A ventilation unit having an intake passage for supplying outside air naturally sucked from the intake port to an intake port of the electronic device, and an exhaust passage for supplying inside air exhausted from an exhaust port of the electronic device to the exhaust port; The noise reduction device according to claim 1, further provided above the electronic device inside the housing. The noise reduction device according to claim 2, wherein the intake passage and the exhaust passage form a multistage structure above the electronic device and are folded back in opposite directions by both surfaces of a common partition member. The noise reduction device according to claim 3, wherein the partition member is a thin film that can vibrate. The silencer according to claim 4, wherein the position of the partition member is variable. Detecting means for detecting sound volume in the vicinity of the intake port and in the vicinity of the exhaust port;
Drive means for controlling the position of the partition member;
The silencer according to claim 5, further comprising a control unit that controls the driving unit and determines a position of the partition member based on the volume detected by the detection unit. The noise reduction device according to claim 1, wherein a shock absorbing material that absorbs shock and vibration is provided inside the housing. The noise reduction device according to claim 1, wherein a sound absorbing material that absorbs sound is provided inside the intake passage and the exhaust passage. The silencer according to claim 1, wherein a plurality of the electronic devices are stored inside the housing. The noise reduction device according to claim 9, wherein a partition member that divides the inside of the housing into an intake side and an exhaust side is provided at a location in the housing where the electronic device is not installed. An electronic device having a ventilation function is housed inside the housing, the operation sound of the device is reduced, and an intake port for sucking outside air and an exhaust port for exhausting inside air to the outside are provided in the electronic device of the housing Prepared above the position of
The electronic device further includes an intake passage for supplying outside air sucked from the intake port to the intake port of the electronic device, and an exhaust passage for supplying inside air exhausted from the exhaust port of the electronic device to the exhaust port. In the silencer provided with a ventilation unit that forms a multi-stage structure at the top and is folded back in the opposite direction by both surfaces of a common partition member made of a thin film that can vibrate, above the electronic device inside the housing.
Detecting the volume in the vicinity of the intake port and the exhaust port,
Controlling the position of the partition member;
A noise reduction method for determining an installation position of the partition member based on the detected sound volume.

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