JP7129834B2 - electronics unit - Google Patents

Description

The present invention relates to electronic equipment units.

Conventionally, in electronic device units such as power supply units, where various electronic components that generate heat when energized are placed inside the case, various electronic components are cooled by using a fan or the like to circulate air through the flow path inside the case. There is something to cool.
Patent Literature 1 discloses a configuration in which a spiral structure is arranged in a flow path portion within a case. In the configuration of Patent Document 1, the sound generated by the fan or the like is attenuated or silenced by the spiral structure, so that noise leaking to the outside of the case can be reduced.

JP 2012-117518 A

However, in the configuration of Patent Literature 1, the air flow in the flow path portion is obstructed by the helical structure. That is, the configuration of Patent Document 1, which employs the helical structure, has a problem of high ventilation resistance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electronic device unit capable of reducing noise leaking to the outside of the case and reducing the ventilation resistance in the flow path portion inside the case.

One aspect of the present invention includes a case having a flow path portion provided inside through which air flows, and a ventilation port provided at an end of the flow path portion; formed so as to face the mouth and extend in a first orthogonal direction orthogonal to the longitudinal direction as it moves away from the ventilation opening in the longitudinal direction of the flow path, and through the ventilation opening to the outside of the case and a sound absorbing material arranged outside the case and absorbing the sound reflected by the reflecting part , wherein the sound absorbing material is provided on the reflecting surface. It is an electronics unit that is not

Further, according to one aspect of the present invention, a case having a channel portion provided therein through which air flows, and a ventilation port provided at an end of the channel portion, and a case provided to close the ventilation port and a cover with an opening having two openings for opening the flow path to the outside of the case at positions spaced apart from each other; and formed so as to extend in a first orthogonal direction perpendicular to the longitudinal direction as it separates from each opening in the longitudinal direction of the flow path, and reflects sound propagated through each opening to the outside of the case. and two reflective portions having reflective surfaces facing each other, wherein the reflective surfaces of the two reflective portions face each other in the arrangement direction of the two apertures.

According to the present invention, it is possible to reduce the noise leaking to the outside of the case, and to reduce the ventilation resistance in the flow path portion inside the case.

1 is a schematic cross-sectional view showing an electronic device unit according to a first embodiment of the invention; FIG. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1; FIG. 2 is a front view of the electronic equipment unit of FIG. 1 as seen from the first ventilation port side of the case; 2 is a rear view of the electronic device unit of FIG. 1 as seen from the second ventilation port side of the case; FIG. FIG. 2 is an enlarged cross-sectional view of a main part showing the vicinity of a first ventilation port of a case of the electronic device unit of FIG. 1; 2 is an enlarged cross-sectional view of a main part showing the vicinity of a second ventilation opening of the case of the electronic device unit of FIG. 1; FIG. FIG. 7 is a cross-sectional view showing a modification of the electronic device unit of FIGS. 1 to 6; FIG. 5 is a schematic cross-sectional view showing an electronic device unit according to a second embodiment of the invention; FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 8; FIG. 9 is a cross-sectional view taken along line XX of FIG. 8; FIG. 10 is an enlarged cross-sectional view showing a reflecting portion of an electronic equipment unit according to another embodiment of the present invention; FIG. 10 is an enlarged cross-sectional view showing a reflecting portion of an electronic equipment unit according to another embodiment of the present invention;

[First embodiment]
A first embodiment of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, the electronic device unit 1 according to this embodiment includes a case 2 and reflectors 3 and 4 . Further, the electronic equipment unit 1 of this embodiment includes a sound absorbing material 5 .

The case 2 has a channel portion 11 and ventilation holes 12 and 13 . The flow path portion 11 is a space provided inside the case 2 through which air flows. Ventilation ports 12 and 13 are provided at the ends of channel portion 11 . Specifically, the ventilation ports 12 and 13 are provided at both ends in the longitudinal direction (X-axis direction) of the flow path portion 11 . That is, both longitudinal ends of the flow path portion 11 are opened to the outside of the case 2 by the ventilation holes 12 and 13 . The flow path part 11 may meander or curve, for example, but is formed linearly in the present embodiment. The cross-sectional shape of the channel portion 11 perpendicular to the longitudinal direction of the channel portion 11 may be any shape such as a circular shape. As shown in FIG. 2, the cross-sectional shape of the flow path part 11 in this embodiment is rectangular.

Various electronic components (not shown) that generate heat when energized are provided inside the case 2 . The electronic components may be arranged so as to be cooled by the air flowing through the flow path portion 11 . The electronic component may be arranged in the flow channel portion 11 or may be arranged in another space isolated from the flow channel portion 11 .

As shown in FIG. 1 , the flow passage portion 11 of the case 2 is provided with a fan 14 for causing air to flow through the flow passage portion 11 . The fan 14 causes air to flow in the longitudinal direction of the flow path portion 11 . The specific configuration of the fan 14 may be arbitrary. The fan 14 may be arranged at any position in the longitudinal direction of the flow path portion 11 . In this embodiment, the fan 14 is positioned at one end of the flow path portion 11 (the left end in FIG. 1). In this embodiment, the fan 14 is the source of sound (noise source) generated within the case 2 .

As shown in FIGS. 1 and 2, a plate-like body 15 is provided in the channel portion 11 of the present embodiment. The plate-like body 15 is formed in a plate-like shape extending in the longitudinal direction of the channel portion 11 and in a second orthogonal direction (Z-axis direction) orthogonal to the longitudinal direction. Since the channel portion 11 of this embodiment is formed in a straight line, the plate-like body 15 is formed in a flat plate shape. Both ends of the plate-like body 15 in the second orthogonal direction are in contact with the inner surface of the channel portion 11 . As a result, the flow path part 11 is arranged in a first orthogonal direction (Y-axis direction) orthogonal to the longitudinal direction and the second orthogonal direction of the flow path part 11 by the plate-like body 15 in a cross section orthogonal to the longitudinal direction. divided into two areas.

The plate-like body 15 may be arranged in the whole or part of the channel portion 11 in the longitudinal direction of the channel portion 11 . For example, both ends of the plate-like body 15 in the longitudinal direction of the channel portion 11 may be positioned at the respective ventilation openings 12 and 13 . The plate-like body 15 of the present embodiment is arranged in the entire passage portion 11 except for the region where the fan 14 is arranged in the longitudinal direction of the passage portion 11 .
The number of plate-like bodies 15 provided in the flow path portion 11 may be, for example, one. In this embodiment, a plurality of plate-like bodies 15 are arranged at intervals in the first orthogonal direction. The number of plate-like bodies 15 in the illustrated example is three. Thereby, the flow path part 11 is divided into four areas arranged in the first orthogonal direction by the three plate-like bodies 15 in the cross section orthogonal to the longitudinal direction.

As shown in FIGS. 1, 5 and 6, the reflectors 3 and 4 are arranged outside the case 2 so as to face the ventilation openings 12 and 13, respectively. Reflecting portions 3 and 4 have reflecting surfaces 21 that reflect sound propagated to the outside of case 2 through ventilation openings 12 and 13 . Reflecting surface 21 is formed to face ventilation ports 12 and 13 and extend in the first orthogonal direction as it moves away from ventilation ports 12 and 13 in the longitudinal direction of channel portion 11 . As a result, the sound propagated to the outside of the case 2 through the ventilation openings 12 and 13 is reflected by the reflecting surfaces 21 of the reflecting portions 3 and 4, thereby mainly propagating in the first orthogonal direction. Reference D1 in FIGS. 5 and 6 indicates the propagation direction of sound propagating to the outside of the case 2 through the ventilation openings 12 and 13 . Reference D2 indicates the propagation direction of the sound after the sound propagated to the outside of the case 2 through the ventilation openings 12 and 13 and reflected on the reflecting surface 21 .

The reflecting surface 21 of the present embodiment is formed to have an arcuate cross-sectional surface that increases in inclination angle with respect to the longitudinal direction of the channel portion 11 as it separates from the ventilation openings 12 and 13 in the longitudinal direction of the channel portion 11 . In the specification of the present application, the longitudinal direction of the flow path portion 11 on the outside of the case 2 means the direction orthogonal to the planes (YZ plane) of the ventilation openings 12 and 13 .
The shape of the reflecting portions 3 and 4 except for the reflecting surface 21 may be arbitrary. The reflecting portions 3 and 4 of this embodiment are formed in a plate shape following the shape of the reflecting surface 21 . For this reason, the outer surfaces 22 of the reflecting portions 3 and 4 facing away from the reflecting surface 21 are formed in a shape that follows the reflecting surface 21 .

The reflectors 3 and 4 of this embodiment are provided on the lids 6 and 7 with openings. The lids 6 and 7 with openings are provided so as to close the ventilation openings 12 and 13, respectively. The lids 6 and 7 with openings have a plurality of openings 23 that open the flow path 11 to the outside of the case 2 at positions spaced apart from each other.

The lids 6 and 7 with openings of this embodiment are formed in a flat plate shape. Further, the opening hole 23 is formed so as to penetrate the cover portions 6 and 7 with openings in the plate thickness direction.
The planar shape of each opening 23 as seen from the longitudinal direction of the flow channel portion 11 may be arbitrary. As shown in FIGS. 3 and 4, each opening 23 in the present embodiment has a planar shape such that the dimension in the second orthogonal direction is longer than the dimension in the first orthogonal direction.
A plurality of apertures 23 may be arranged arbitrarily. In this embodiment, the plurality of opening holes 23 are arranged in a line with a gap in the first orthogonal direction. The number of apertures 23 may be arbitrary, but is two in this embodiment.

The reflecting portions 3 and 4 are provided one by one for the plurality of opening holes 23 of the same lid portions 6 and 7 with openings. That is, in this embodiment, a plurality of (two in the illustrated example) reflecting portions 3 and 4 are provided for each of the ventilation openings 12 and 13 . Each reflecting part 3 , 4 is arranged outside the case 2 so as to face each opening 23 . Also, the plurality of reflecting portions 3 and 4 provided on the same opening-equipped lid portions 6 and 7 are arranged in the first orthogonal direction at intervals.

As shown in FIGS. 1 and 3 to 6, the reflectors 3 and 4 of the present embodiment extend from one end of the aperture 23 in the first orthogonal direction and both ends of the aperture 23 in the second orthogonal direction to the case 2. It is formed so as to extend outward. That is, the reflecting portions 3 and 4 are formed so as to cover both ends of the aperture 23 in the second orthogonal direction outside the case 2 . Accordingly, it is possible to suppress the sound reflected by the reflecting surfaces 21 of the reflecting portions 3 and 4 from propagating outside the case 2 beyond both ends of the aperture 23 in the second orthogonal direction. In addition, one end of the reflecting portions 3 and 4 of the present embodiment is connected to the opening hole 23, and the other end is the opening end 24 that opens to the outside of the case 2 on one side in the first orthogonal direction. is formed as
The reflecting portions 3 and 4 and the lid portions 6 and 7 with openings described above can be integrally formed, for example, by subjecting a metal plate material to sheet metal processing.

Hereinafter, the reflecting portions 3 and 4 of this embodiment will be described more specifically.
As shown in FIGS. 1 and 5, the reflecting surfaces 21 of the plurality of first reflecting portions 3 arranged in the first ventilation port 12 (the ventilation port 12 on the right side in FIG. 1) of the two ventilation ports 12 and 13 are It is directed to one side of the first orthogonal direction (Y-axis negative direction side). Therefore, the sound reflected by the reflecting surface 21 of each first reflecting portion 3 propagates outside the case 2 mainly to one side in the first orthogonal direction.

The sound absorbing material 5 is arranged outside the case 2 and absorbs the sound reflected by the first reflecting portion 3 described above. The sound absorbing material 5 may be, for example, a porous material such as sponge. The shape of the sound absorbing material 5 may be arbitrary. The sound absorbing material 5 of this embodiment is formed in a plate shape. In this embodiment, the sound absorbing surface 31 of the sound absorbing material 5 that absorbs the sound reflected by the first reflecting portion 3 is a flat surface perpendicular to the plate thickness direction of the sound absorbing material 5 .
The sound absorbing material 5 is positioned away from the first ventilation port 12 to the outside of the case 2 in the longitudinal direction of the flow path portion 11 . Moreover, the sound absorbing material 5 is arranged at a position shifted in the first orthogonal direction with respect to the plurality of first reflecting portions 3 .

The sound absorbing material 5 of this embodiment includes a first sound absorbing material 5A and a second sound absorbing material 5B.
The first sound absorbing material 5</b>A absorbs the sound reflected by the reflecting surface 21 of the first reflecting portion 3 . Therefore, the first sound absorbing material 5A is arranged on one side of the plurality of first reflecting portions 3 in the first orthogonal direction so as to face the reflecting surface 21 of the first reflecting portion 3 in the first orthogonal direction. distributed. The first sound absorbing material 5A is preferably arranged so that there is no gap in the longitudinal direction of the flow path part 11 with respect to the lid part 6 with the opening, or the gap with respect to the lid part 6 with the opening is small as shown in the illustrated example. . In this case, the sound reflected by the reflecting surface 21 of the first reflecting portion 3 can be suppressed or prevented from leaking from between the first sound absorbing material 5A and the lid portion 6 with opening.
The second sound absorbing material 5B absorbs the sound reflected by the reflecting surface 21 of one first reflecting portion 3 and then reflected by another first reflecting portion 3 (for example, the outer surface 22 of the other first reflecting portion 3). Therefore, the second sound absorbing material 5</b>B is arranged on the other side of the first orthogonal direction (the Y-axis positive direction side) with respect to the plurality of first reflecting portions 3 . Reference symbol D3 in FIG. 5 indicates the propagation direction of the sound reflected by the outer surface 22 of the other first reflecting portion 3 after being reflected by the reflecting surface 21 of one of the first reflecting portions 3 .

The sound absorbing surface 31 of each sound absorbing material 5 may be parallel to the longitudinal direction of the flow path portion 11, as indicated by the two-dot chain line in FIG. 5, for example. In the present embodiment, the sound absorbing surface 31 of each sound absorbing material 5 is positioned so as to approach the first reflecting portion 3 in the first orthogonal direction as it separates from the first ventilation port 12 in the longitudinal direction of the flow channel portion 11. It is inclined with respect to the longitudinal direction of the portion 11 .

As shown in FIGS. 1 and 6, the reflecting surfaces 21 of the two second reflecting portions 4 arranged in the second ventilation port 13 (left side ventilation port 13 in FIG. 1) of the two ventilation ports 12 and 13 are They face each other in the first orthogonal direction (the direction in which the two apertures 23 are arranged). Therefore, the sound propagated to the outside of the case 2 through the opening holes 23 of the lids 6 and 7 provided in the second ventilation port 13 is reflected by the reflecting surfaces 21 of the two second reflecting portions 4. , is returned in Case 2. Reference symbol D4 in FIG. 6 indicates the propagation direction of the sound reflected by the reflecting surface 21 of the second reflecting portion 4 on one side and then reflected by the reflecting surface 21 of the second reflecting portion 4 on the other side.

The distance L1 between the two second reflecting portions 4 in the first orthogonal direction is greater than the sum of the lengths L2 and L3 of the open ends 24 of the two second reflecting portions 4 in the longitudinal direction of the flow path portion 11. is preferred. In this case, the ventilation resistance in the flow path portion 11 can be kept small.

As described above, according to the electronic device unit 1 of the present embodiment, the sound generated by the fan 14 arranged inside the case 2 is reflected by the first reflecting portion 3 arranged outside the case 2 and , and is absorbed in the sound absorbing material 5 . As a result, noise leaking to the outside of the case 2 can be reduced.
Moreover, since the sound absorbing material 5 absorbs the sound reflected by the first reflecting portion 3 , the sound absorbing material 5 can be arranged at a position away from the first ventilation port 12 of the case 2 . As a result, the sound absorbing material 5 can be prevented from becoming a ventilation resistance in the flow path portion 11 . Moreover, since the first reflecting portion 3 is arranged outside the case 2 , it is possible to prevent the first reflecting portion 3 from becoming a ventilation resistance in the flow path portion 11 . As described above, the ventilation resistance in the flow path portion 11 can be kept small. By reducing the ventilation resistance in the flow path part 11, even if various electronic parts that generate heat when energized are arranged in the case 2, the air can flow efficiently in the flow path part 11, and the electronic parts can be efficiently cooled. .

Further, according to the electronic device unit 1 of the present embodiment, the sound generated by the fan 14 inside the case 2 is reflected by the reflecting surfaces 21 of the two second reflecting portions 4 arranged outside the case 2. , is returned in Case 2. As a result, it is possible to suppress the sound in the case 2 from propagating away from the case 2 . In addition, sound energy can be effectively attenuated by reflecting the sound twice at the two second reflecting portions 4 . As a result, noise leaking to the outside of the case 2 can be reduced.
Moreover, since the second reflecting portion 4 is arranged outside the case 2 , it is possible to suppress the second reflecting portion 4 from becoming a ventilation resistance in the flow path portion 11 . Furthermore, by arranging the two second reflecting portions 4 with a space therebetween, it is possible to prevent the two second reflecting portions 4 from becoming ventilation resistance in the flow path portion 11 . As described above, the ventilation resistance in the flow path portion 11 can be kept small.

Further, according to the electronic device unit 1 of the present embodiment, the lids 6 and 7 with openings having a plurality of openings 23 are provided in the ventilation openings 12 and 13 of the case 2, and the plurality of reflecting portions 3 and 4 are provided in a plurality of openings. are provided one by one for the opening holes 23 of . Therefore, compared to the case where only one reflecting portion 3, 4 is provided for the same ventilation openings 12, 13, the reflecting portions 3, 4 can be made smaller. As a result, the ventilation resistance generated at the ventilation openings 12 and 13 based on the reflecting portions 3 and 4 can be reduced.
Furthermore, since the reflecting portions 3 and 4 can be made small, the amount of sheet metal processing can be reduced when the reflecting portions 3 and 4 and the lid portions 6 and 7 with openings are integrally formed by sheet metal processing. That is, the reflecting portions 3 and 4 can be efficiently formed as compared with the case where one reflecting portion 3 and 4 is formed on the same lid portions 6 and 7 with openings.

Furthermore, according to the electronic device unit 1 of the present embodiment, the first sound absorbing material 5 that absorbs the sound reflected by the first reflecting portion 3 absorbs the sound reflected by the reflecting surface 21 of the first reflecting portion 3. There are the material 5A and the second sound absorbing material 5B that absorbs the sound reflected by the other first reflecting portion 3 after being reflected by the reflecting surface 21 of one of the first reflecting portions 3 . Therefore, not only the sound reflected by the reflecting surface 21 of the first reflecting portion 3 but also the sound reflected by the reflecting surface 21 of one first reflecting portion 3 is reflected by another first reflecting portion 3 (for example, another first reflecting portion). The sound that is further reflected on the outer surface 22) of 3 can also be absorbed by the sound absorbing material 5. FIG. Therefore, noise leaking to the outside of the case 2 can be further reduced.

Further, according to the electronic device unit 1 of the present embodiment, the first sound absorbing material 5A is arranged on one side of the plurality of first reflecting portions 3 in the first orthogonal direction in which the reflecting surfaces 21 of the first reflecting portions 3 face. distributed. Thereby, the sound reflected by the reflecting surface 21 of each first reflecting portion 3 can be reliably absorbed by the first sound absorbing material 5A.
Moreover, the second sound absorbing material 5B is arranged on the other side of the plurality of first reflecting portions 3 in the first orthogonal direction. As a result, after being reflected by the reflecting surface 21 of the one first reflecting portion 3, the sound reflected by the other first reflecting portion 3 located on one side of the one first reflecting portion 3 in the first orthogonal direction can be effectively absorbed by the second sound absorbing material 5B.

Further, in the electronic device unit 1 of the present embodiment, the sound absorbing surface 31 of the sound absorbing material 5 moves toward the first reflecting portion 3 in the first orthogonal direction as it moves away from the first ventilation port 12 in the longitudinal direction of the flow path portion 11. It is inclined with respect to the longitudinal direction of the flow path part 11 so that it may approach. For this reason, compared with the case where the sound absorbing surface 31 of the sound absorbing material 5 is parallel to the longitudinal direction of the flow path part 11, the dimension of the sound absorbing material 5 in the longitudinal direction of the flow path part 11 is reduced while the first reflection part The sound reflected at 3 can be efficiently absorbed. Therefore, the size of the electronic device unit 1 can be reduced.

Further, according to the electronic device unit 1 of the present embodiment, the flow channel portion 11 of the case 2 is provided with the plate-like body 15 formed in a plate shape extending in the longitudinal direction of the flow channel portion 11 and the second orthogonal direction. It is Therefore, even if the direction of propagation of sound in the flow path portion 11 includes a component in the first orthogonal direction, the sound is By reflecting on the inner surface of the portion 11 , the propagation direction of the sound from the inside of the case 2 (flow path portion 11 ) through the ventilation openings 12 and 13 and the opening 23 is first with respect to the longitudinal direction of the flow path portion 11 . Inclination in the orthogonal direction can be suppressed. In particular, in the electronic equipment unit 1 of the present embodiment, since a plurality of plate-like bodies 15 are arranged at intervals in the first orthogonal direction, the direction of sound propagation through the ventilation openings 12 and 13 and the aperture 23 is , the inclination in the first orthogonal direction with respect to the longitudinal direction of the channel portion 11 can be effectively suppressed. Thereby, the range of the propagation direction of the sound reflected by the reflecting surfaces 21 of the reflecting portions 3 and 4 can be limited. Therefore, the sound reflected by the reflecting surfaces 21 of the reflecting portions 3 and 4 can be efficiently directed toward the sound absorbing material 5 or returned into the case 2 .
In addition, sound energy is effectively attenuated by repeated reflection of sound on the main surface of the plate-like body 15 and the inner surface of the flow path portion 11, so that noise leaking to the outside of the case 2 can be reduced. .

For example, as shown in FIG. 7, a plate-like sound absorbing material 16 may be provided in addition to the plate-like body 15 in the flow path portion 11 of the first embodiment. In this case, the plate-like bodies 15 may be arranged at intervals in the second orthogonal direction (Z-axis direction). The plate-like sound absorbing material 16 is formed in a plate-like shape extending in the longitudinal direction (X-axis direction) and the first orthogonal direction (Y-axis direction) of the flow path portion 11, and is arranged in the second orthogonal direction. It may be arranged between bodies 15 . The plate-shaped sound absorbing material 16 absorbs the sound propagating in the flow path portion 11, and may be a porous material such as sponge. Both ends of the plate-like sound absorbing material 16 in the first orthogonal direction are preferably in contact with the inner surface of the flow path portion 11 . As a result, the flow path portion 11 is partitioned into a plurality of regions (four regions in FIG. 7) arranged in the first orthogonal direction by the plate-like body 15 in a cross section perpendicular to the longitudinal direction, and It is divided into two regions arranged in the second orthogonal direction by the plate-shaped sound absorbing material 16 .

In the configuration illustrated in FIG. 7 , even if the component in the first orthogonal direction is included in the propagation direction of the sound in the channel portion 11, the plate-like body 15 allows ventilation from the inside of the case 2 (channel portion 11). It is possible to prevent the direction of propagation of sound passing through the mouths 12 and 13 and the aperture 23 from being inclined in the first orthogonal direction with respect to the longitudinal direction of the flow path portion 11 . Further, even if the propagation direction of sound in the flow path part 11 includes a component in the second orthogonal direction, the sound propagating in the second orthogonal direction can be absorbed by the plate-shaped sound absorbing material 16 . Therefore, it is possible to more effectively suppress the sound propagation direction in the flow path portion 11 from being inclined with respect to the longitudinal direction of the flow path portion 11 . Moreover, by absorbing the sound propagating in the flow path portion 11 with the plate-like sound absorbing material 16, the noise leaking out of the case 2 can be effectively reduced.

[Second embodiment]
Next, a second embodiment of the invention will be described with reference to FIGS. In the second embodiment, the same components as in the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.

As shown in FIG. 8, an electronic device unit 1C of this embodiment includes a case 2, reflectors 3 and 4, sound absorbing material 5, lids 6 and 7 with openings, and the like, which are similar to those of the first embodiment. Further, the electronic device unit 1C of the present embodiment includes plate-like bodies 18C and 19C provided in the flow path portion 11 of the case 2, as in the first embodiment.
However, the plate-like bodies 18C and 19C of the present embodiment are arranged in a plurality in the longitudinal direction (X-axis direction) of the flow path portion 11 . As shown in FIGS. 8 to 10, the thickness directions of the two plate-like bodies 18C and 19C adjacent to each other in the longitudinal direction of the channel portion 11 are oriented in different directions. Specifically, the plate thickness directions of the two plate-like bodies 18C and 19C adjacent to each other in the longitudinal direction of the channel portion 11 are orthogonal to each other.

In the electronic device unit 1C shown in FIGS. 8 to 10, two plate-like bodies 18C and 19C are arranged in the longitudinal direction of the flow path portion 11. As shown in FIG.
The first plate-like body 18C arranged on the first ventilation port 12 side in the longitudinal direction of the flow path part 11 is arranged in the longitudinal direction of the flow path part 11 and the second orthogonal direction, similarly to the plate-like body 15 of the first embodiment. It is formed in a plate shape extending in the direction (Z-axis direction). The number of first plate-like bodies 18C may be one, for example. In this embodiment, a plurality (three in the illustrated example) of the first plate-like bodies 18C are arranged at intervals in the first orthogonal direction (Y-axis direction).

On the other hand, the second plate-like body 19C arranged on the second ventilation port 13 side (fan 14 side) is formed in a plate shape extending in the longitudinal direction of the flow path portion 11 and in the first orthogonal direction. The number of second plate-like bodies 19C may be one, for example. In this embodiment, a plurality (three in the illustrated example) of the second plate-like bodies 19C are arranged at intervals in the second orthogonal direction.
The first plate-like body 18</b>C and the second plate-like body 19</b>C may be arranged, for example, in the longitudinal direction of the flow path section 11 with an interval therebetween. In the present embodiment, the first plate-like body 18C and the second plate-like body 19C are arranged without gaps in the longitudinal direction of the flow path portion 11 .

According to the electronic device unit 1C of the second embodiment, the same effects as those of the first embodiment are obtained.
In addition, in the electronic device unit 1C of the second embodiment, the plate thickness directions of the two plate-like bodies 18C and 19C adjacent to each other in the longitudinal direction of the flow path portion 11 face different directions. In particular, the first plate-like body 18C is formed in a plate shape extending in the longitudinal direction and the second orthogonal direction of the channel portion 11, and the second plate-like body 19C is formed in the longitudinal direction of the channel portion 11 and the first orthogonal direction. It is formed in an elongated plate shape.

Therefore, even if the propagation direction of the sound in the channel portion 11 includes a component in the first orthogonal direction, the sound is reflected on the main surface of the first plate-like body 18C and the inner surface of the channel portion 11 facing thereto. As a result, the direction of sound propagation from the inside of the case 2 (flow path portion 11) through the ventilation openings 12 and 13 and the opening hole 23 is inclined in the first orthogonal direction with respect to the longitudinal direction of the flow path portion 11. can be suppressed. Further, even if the propagation direction of the sound in the channel portion 11 includes a component in the second orthogonal direction, the sound is reflected by the main surface of the second plate-like body 19C and the inner surface of the channel portion 11 facing the second plate-like body 19C. , the direction of propagation of sound passing through the ventilation openings 12 and 13 and the opening hole 23 from the inside of the case 2 (flow path part 11) can be suppressed from being inclined in the second orthogonal direction with respect to the longitudinal direction of the flow path part 11. . That is, it is possible to more effectively suppress the sound propagation direction in the flow path portion 11 from being inclined with respect to the longitudinal direction of the flow path portion 11 . Thereby, the range of the propagation direction of the sound reflected by the reflecting surfaces 21 of the reflecting portions 3 and 4 can be further limited. Therefore, the sound reflected by the reflecting surfaces 21 of the reflecting portions 3 and 4 can be more efficiently directed toward the sound absorbing material 5 or returned into the case 2 .

Further, in the electronic equipment unit 1C of the second embodiment, the first plate-like body 18C and the second plate-like body 19C are arranged at different positions in the longitudinal direction of the flow path portion 11 . Therefore, when the first plate-like body 18C and the second plate-like body 19C are arranged at the same position in the longitudinal direction of the flow path portion 11, that is, the first plate-like body 18C and the second plate-like body 19C flow Compared to the case where the passage portion 11 is provided in a grid pattern, the ventilation resistance in the passage portion 11 can be suppressed to be small.

In the second embodiment, the number of plate-like bodies arranged in the longitudinal direction of the flow channel portion 11 may be three or more. In this case, the thickness directions of the other plate-shaped bodies located on both sides of the one plate-shaped body in the longitudinal direction of the flow path portion 11 may be different from each other or may be the same.

The plate-shaped sound absorbing material 16 illustrated in FIG. 7 may be applied to the electronic equipment unit 1C of the second embodiment. For example, the first plate-like bodies 18C are arranged at intervals in the second orthogonal direction, and between the first plate-like bodies 18C arranged in the second orthogonal direction, the longitudinal direction and the first vertical direction of the flow path part 11 are arranged. A plate-like sound absorbing material 16 extending in the transverse direction may be arranged. In addition, the second plate-like bodies 19C are arranged at intervals in the first orthogonal direction, and between the second plate-like bodies 19C arranged in the first orthogonal direction, the longitudinal direction of the flow path portion 11 and the second plate-like bodies 19C are arranged. A plate-like sound absorbing material 16 extending in two orthogonal directions may be arranged.

Although the details of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

In the present invention, as shown for example in FIGS. It may have an extended surface 26 formed contiguously with the tip. The extension surface 26 is orthogonal to the longitudinal direction of the flow channel portion 11 . The extension surface 26 may face the ventilation openings 12 and 13 of the case 2 and the opening holes 23 of the lid portions 6 and 7 with openings in the longitudinal direction of the flow path portion 11 as shown in the illustrated example, but it is not limited to this. do not have.

When the reflecting portions 3 and 4 have the extension surface 26 , the sound reflected by the reflection surface 21 can be further reflected by the extension surface 26 . Therefore, the sound reflected by the reflecting surface 21 can be suppressed from propagating in the longitudinal direction of the flow path portion 11 away from the ventilation openings 12 and 13 of the case 2 and the opening holes 23 of the lid portions 6 and 7 with openings. . Therefore, the sound reflected by the reflecting surface 21 can be efficiently directed toward the sound absorbing material 5 or returned into the case 2 .
Moreover, the sound propagated to the outside of the case 2 through the ventilation openings 12 and 13 can be returned to the inside of the case 2 by reflecting it on the extension surface 26 .

In the present invention, for example, as shown in FIG. 12, the reflecting surfaces 21 of the reflecting portions 3 and 4 may be formed as flat surfaces having a constant inclination angle with respect to the longitudinal direction of the channel portion 11 .

In the present invention, the arranging direction of the plurality of first reflecting portions 3 and the arranging direction of the plurality of second reflecting portions 4 may be the same as in the above-described embodiment, but may be different from each other, for example.

In the present invention, for example, both the two vents 12 and 13 of the case 2 may be provided with the first reflector 3 and the sound absorbing material 5, or both the two vents 12 and 13 may be provided with two second A reflector 4 may be provided.

In the present invention, the first reflector 3 may be directly provided on the case 2, for example. That is, the electronic equipment unit of the present invention does not have to include the opening lid 6, for example.

In the present invention, the sound (noise) generated in the case 2 is not limited to the fan 14 and may be arbitrary.

1, 1C Electronic equipment unit 2 Case 3 First reflection part (reflection part)
4 second reflection part (reflection part)
5 Sound absorbing material 5A First sound absorbing material 5B Second sound absorbing material 6, 7 Cover with opening 11 Flow path 12 First ventilation port (ventilation port)
13 Second ventilation port (ventilation port)
14 fan 15 plate-like body 16 plate-like sound absorbing material 18C first plate-like body (plate-like body)
19C second plate-shaped body (plate-shaped body)
21 reflecting surface 22 outer surface 23 opening hole 24 opening end 26 extension surface 31 sound absorbing surface

Claims (8)

a case having a channel portion provided therein through which air flows, and a ventilation port provided at an end of the channel portion;
arranged on the outside of the case, facing the ventilation opening, and extending in a first orthogonal direction perpendicular to the longitudinal direction as the distance from the ventilation opening increases in the longitudinal direction of the flow path a reflective portion having a reflective surface that reflects sound propagated to the outside of the case through the ventilation opening;
a sound absorbing material disposed outside the case and absorbing sound reflected by the reflecting portion;
with
The electronic device unit , wherein the sound absorbing material is not provided on the reflecting surface . a cover with an opening provided to block the ventilation port and having a plurality of openings for opening the flow path to the outside of the case at positions spaced apart from each other;
2. The electronic device unit according to claim 1, wherein one reflecting portion is provided for each of the plurality of opening holes. The sound absorbing material includes a first sound absorbing material that absorbs sound reflected by the reflecting surface, and a second sound absorbing material that absorbs sound reflected by the other reflecting portion after being reflected by the reflecting surface of one reflecting portion. 3. The electronics unit of claim 2, wherein . A plurality of the reflecting portions are arranged in the first orthogonal direction,
The reflective surfaces of the plurality of reflective portions are directed to one side of the first orthogonal direction,
The first sound absorbing material is arranged on one side of the plurality of reflecting portions in the first orthogonal direction,
4. The electronic device unit according to claim 3, wherein the second sound absorbing material is arranged on the other side of the plurality of reflecting portions in the first orthogonal direction. With respect to the longitudinal direction, the sound absorbing surface of the sound absorbing material that absorbs the sound reflected by the reflecting portion approaches the reflecting portion in the first orthogonal direction as it moves away from the ventilation opening in the longitudinal direction. 5. The electronics unit according to any one of claims 1 to 4, which is slanted. a case having a channel portion provided therein through which air flows, and a ventilation port provided at an end of the channel portion;
a lid portion with an opening provided to close the ventilation port and having two opening holes for opening the flow path portion to the outside of the case at positions spaced apart from each other;
Disposed on the outside of the case, facing each opening, and extending in a first orthogonal direction perpendicular to the longitudinal direction as it separates from each opening in the longitudinal direction of the flow path part and two reflective portions having reflective surfaces that reflect sound that is formed and propagated to the outside of the case through each opening,
The electronic device unit, wherein the reflective surfaces of the two reflective portions face each other in the arrangement direction of the two apertures. 1. A plate-like body provided in the flow path portion and formed in a plate shape extending in the longitudinal direction and in a second orthogonal direction orthogonal to the longitudinal direction and the first orthogonal direction. 7. The electronic device unit according to any one of 6. 8. The reflective portion has an extended surface perpendicular to the longitudinal direction, the reflective portion being connected to the tip of the reflective surface located farthest from the ventilation opening in the longitudinal direction. electronics unit according to paragraph.

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