JP4687099B2 - Blower - Google Patents

Description

  The present invention relates to a blower used for a ventilation blower or the like.

  Conventionally, this type of blower is required to reduce noise generated in the main body by sound insulation and reduction of resonance noise (see, for example, Patent Document 1).

  Hereinafter, the blower will be described with reference to FIG.

As shown in the figure, a main body 101 having an open bottom surface, a motor 104 having an impeller 103 fixed to a top surface 102 in the main body 101, a spiral casing 105 surrounding the impeller 103 and the periphery, a bell mouth shape, and the like are shown. An orifice 109 having a suction hole 108 that is the same as or smaller than the suction port 106 of the suction casing 107 is separated from the suction casing 107 having the suction port 106 by a gap h. Turbulent noise and resonance noise are silenced by a ceiling-embedded ventilation fan in which a grill 112 is provided at the lower surface opening of the main body 101 below the orifice 109.
JP-A-8-94146 (5th page, FIG. 1)

  In such a conventional air blower, since an orifice having a complicated shape is used, it has to be provided as a separate part, and there is a problem that the manufacturing cost increases.

  SUMMARY OF THE INVENTION The present invention solves such a conventional problem, and an object thereof is to obtain a silencing effect equivalent to or higher than that of a conventional one with a simple shape.

In order to achieve the above object, a blower of the present invention includes a box-shaped main body, a body suction port for sucking air from outside into the main body, a fan in the main body, and an upstream side and a downstream side of the fan. A partition plate that partitions the boundary between the main body and the orifice having a bell mouth-like suction port, and a plate-shaped sound insulating wall from the main body to the orifice, and the main body and the partition plate on the upstream side of the orifice And a sealed cavity surrounded by the sound insulation wall, and a gap, the gap is provided on the upstream side of the fan, and one of the gaps communicates with the space from the downstream side of the main body suction port to the upstream side of the suction port is other of the gaps communicates with the sealed cavity, the sealed cavity except the gap is surrounded by the said partition plate and said body sound insulating wall, when viewed from a plane perpendicular to the axis of rotation of the fan, Wherein a serial inlet sound insulation wall, characterized in that is provided so as to overlap.

  In addition, the blower of the present invention is characterized in that the center of the main body suction port and the center of the suction port do not overlap each other when viewed from a plane perpendicular to the rotation axis of the fan.

Further, the air blower of the present invention includes a sound insulating plate in an extending direction beyond the center of the suction port in the direction from the center of the main body suction port toward the center of the suction port when viewed from a plane perpendicular to the rotation axis of the fan. It is characterized by that.

  Moreover, the air blower according to the present invention is characterized in that the sealed cavity is filled with a sound absorbing material having air permeability.

The blower of the present invention includes a box-shaped main body, a dividing plate that is divided so that an upper surface and a lower surface of the main body are separated, a first suction port that sucks air from outside into the main body, and the dividing plate. A second suction port for sucking in air sucked from the first suction port, a fan in the space downstream of the second suction port, a partition plate for partitioning the boundary between the upstream side and the downstream side of the fan, and the partition plate An orifice having a bell mouth-shaped suction port, and on the upstream side of the orifice, is surrounded by a plate-shaped sound insulating wall facing the orifice from the divided plate , the main body, the divided plate, the partition plate, and the sound insulating wall. A sealed cavity and a gap, the gap is provided on the upstream side of the fan , and one of the gaps communicates with a space from the downstream side of the second suction port to the upstream side of the suction port, and the other of the gaps Said sealed cavity It communicates with, the sealing cavity except the gap is surrounded by the said partition plate and said dividing plate and the body sound insulating wall, when viewed from a plane perpendicular to the axis of rotation of the fan, the said suction port sound insulation wall is It is provided to overlap.

  In addition, the blower of the present invention is characterized in that the center of the second suction port and the center of the suction port do not overlap when viewed from a plane perpendicular to the rotation axis of the fan.

In addition, the air blower of the present invention includes a sound insulation wall in an extending direction beyond the center of the suction port in a direction from the center of the second suction port toward the center of the suction port when viewed from a plane perpendicular to the rotation axis of the fan. It is characterized by that.

  Moreover, the air blower according to the present invention is characterized in that the sealed cavity is filled with a sound absorbing material having air permeability.

According to the blower of the present invention, the sound wave radiated from the suction port is easily radiated into the gap, and can effectively reduce turbulent noise and resonance noise , and is generated in the main body with a simple structure. A blower that can mute turbulent noise and resonance noise is obtained.

The blower according to claim 1 is a box-shaped main body, a main body suction port for sucking air from the outside into the main body, a fan in the main body, and a partition that partitions the boundary between the upstream side and the downstream side of the fan. A plate and an orifice having a bell mouth-like suction port in the partition plate, and on the upstream side of the orifice, a plate-shaped sound insulating wall from the main body to the orifice , and surrounded by the main body, the partition plate, and the sound insulating wall A sealed cavity and a gap, the gap being provided upstream of the fan , wherein one of the gaps communicates with a space from the downstream side of the main body suction port to the upstream side of the suction port. communicates with the sealed cavity and the sealing cavity wherein the non-gap is surrounded by the said partition plate and said body sound insulation wall, seen from a plane perpendicular to the axis of rotation of the fan, the said suction port Which is characterized by comprising as the sound walls overlap, closed cavity which is resonant absorption is made by the sound insulating wall, the inlet and the sound insulating wall is overlapped when viewed from a plane perpendicular to the axis of rotation of the fan This makes it easier for sound waves radiated from the suction port to be radiated into the gap, effectively reducing turbulence noise and resonance noise, and reducing the turbulence noise and resonance noise generated in the main body with a simple structure. Can be muted.

Invention according to claim 2, in the blowing device according to claim 1, comprising a main body suction port for sucking air from the outside to the box-like body, when viewed from a plane perpendicular from the axis of rotation of the fan, said body The center of the inlet and the center of the inlet are provided so that they do not overlap, creating a sealed cavity that is resonantly absorbed by the sound insulation wall, and it is difficult for sound waves to be emitted from the inlet to the outside. Thus, it is possible to mute turbulent flow noise and resonance noise generated in the main body with a simple structure.

According to a third aspect of the invention, the blowing device according to claim 1 or 2, when viewed from a plane perpendicular to the axis of rotation of the fan, the suction port in a direction toward the center of the inlet from the center of the main body suction port It is characterized by having a sound insulation plate extending in the direction beyond the center of the airtight, creating a sealed cavity that is resonance-absorbed by the sound insulation wall, making it difficult for sound waves to be emitted from the suction port to the outside. With the structure, turbulent noise and resonance noise generated in the main body can be silenced.

According to a fourth aspect of the present invention, in the blower device according to any one of the first to third aspects, the sound absorption material having air permeability is filled in the sealed cavity, and resonance absorption is performed by the sound insulation wall. In addition, due to the effect of the sound absorbing material, the turbulent noise and resonance noise generated in the main body can be silenced by the effect of the sound absorbing material.

The blower device according to claim 5 includes a box-shaped main body, a dividing plate that is divided so that an upper surface and a lower surface of the main body are separated, a first suction port that sucks air from outside into the main body, and the dividing plate. A second suction port for sucking in air sucked from the first suction port, a fan in the space downstream of the second suction port, a partition plate for partitioning the boundary between the upstream side and the downstream side of the fan, and the partition plate And an orifice having a bell mouth-shaped suction port, and on the upstream side of the orifice, a plate-shaped sound insulating wall facing the orifice from the dividing plate, and surrounded by the main body, the dividing plate, the partition plate, and the sound insulating wall. A closed cavity portion and a gap , and the gap is provided on the upstream side of the fan , and one of the gaps communicates with the space from the downstream side of the second suction port to the upstream side of the suction port. Is the sealed sky Parts and communicating said sealed cavity except the gap is surrounded by the said partition plate and said dividing plate and the body sound insulating wall, when viewed from a direction perpendicular to the rotation axis of the fan, the said suction port sound insulation wall It is characterized in that it is provided so that it overlaps, and a sealed cavity that is resonantly absorbed by the sound insulation wall is created, and when viewed from a plane perpendicular to the rotation axis of the fan, the suction port and the sound insulation wall overlap, Sound waves radiated from the suction port can be easily radiated to the gap, effectively reducing turbulent noise and resonance noise, and with a simple structure, turbulent noise and resonance noise generated in the main unit can be silenced. can do.

According to a sixth aspect of the present invention, in the blower device according to the fifth aspect , the center of the second suction port and the center of the suction port do not overlap when viewed from a plane perpendicular to the rotation axis of the fan. It is characterized by the fact that a sealed cavity that is resonantly absorbed by the sound insulation wall is created, and it is difficult for sound waves to be emitted to the outside through the suction port, and the turbulent noise and resonance generated in the main body with a simple structure Noise can be silenced.

Invention according to claim 7, in the blowing device according to claim 5 or 6, when viewed from a plane perpendicular to the axis of rotation of the fan, the suction of the direction toward the center of the inlet from the center of the second suction port The sound insulation wall is provided in the extending direction beyond the center of the mouth , and a sealed cavity that is resonantly absorbed by the sound insulation wall is created. With a simple structure, turbulent noise and resonance noise generated in the main body can be silenced.

A fourteenth aspect of the present invention is the air blower device according to any one of the fifth to seventh aspects, wherein the sealed cavity is filled with a sound-absorbing material having air permeability, and is resonantly absorbed by the sound insulation wall. In addition, due to the effect of the sound absorbing material, the turbulent noise and resonance noise generated in the main body can be silenced by the effect of the sound absorbing material.

  Hereinafter, the form of the air blower of this invention is demonstrated, referring FIGS. 1-15.

(Embodiment 1)
FIG. 1 is a cross-sectional view parallel to the rotation axis of the fan, showing the configuration of the blower in Reference Example 1 . FIG. 2 is a cross-sectional view parallel to the rotation axis of the fan, showing the configuration of the blower with the sound insulation wall attached. FIG. 3 is a cross-sectional view parallel to the rotation axis of the fan, showing the configuration of the blower in which the sound insulation wall according to Embodiment 1 of the present invention is attached to the upstream side of the orifice. FIG. 4 is a cross-sectional view perpendicular to the rotational axis of the fan having the same configuration as FIG. FIG. 5 is a top view seen from a plane perpendicular to the rotation axis of the fan. FIG. 6 is a cross-sectional view parallel to the rotation axis of the fan, showing the configuration of the blower device to which a sound absorbing material having air permeability is attached.

As shown in FIG. 1, a blower of Reference Example 1 includes a box-shaped main body 1, a main body suction port 2 that sucks air from the outside into the upper surface of the main body 1, a fan 3 in the main body 1, and a fan 3. A partition plate 4 for partitioning the boundary between the upstream side and the downstream side of the fan, and an orifice 6 having a bell mouth-like suction port 5 on the partition plate, and a part of the sound generated from the fan 3 on the upstream side of the fan 3 It is configured to include a sealed cavity portion 8 that is incident on the tube portion 7 and is resonantly absorbed.

  Here, the main body 1 is a cube, but if it has a configuration as shown in FIG.

  When viewed from a plane perpendicular to the rotation axis 9 of the fan 3, the shape of the suction port 5 is circular, and the center of the suction port 5 is on the rotation shaft 9 of the fan 3.

  Moreover, in FIG. 1, although the shape of the pipe part 7 is a circular pipe, it does not necessarily need to be a circular pipe.

  The pipe portion 7 is provided on the upstream side of the fan 3, one communicating with the space from the downstream side of the main body suction port 2 to the upstream side of the suction port 5, and the other communicating with the sealed cavity portion 8. The sealed cavity portion 8 communicates with the outside through the tube portion 7 and is surrounded by a wall except for a portion communicating with the outside through the tube portion 7.

  Moreover, although the main body inlet 2 was provided in the upper surface of the main body 1, as long as it is an upstream side of the fan 3 in space other than the sealing cavity part 8, it may be provided anywhere.

  As a principle of resonance absorption, the air in the tube portion 7 acts as an incompressible mass, and the air in the sealed cavity portion 8 acts as one spring, and selectively selects a sound corresponding to the resonance frequency of this vibration system. Can absorb sound. For this reason, the frequency which absorbs a sound can be selected by changing the shape of the pipe part 7 or the sealed cavity part 8.

  Here, an expression for obtaining the resonance frequency to be silenced is shown.

  Here, fr: resonance frequency, C: speed of sound, n: number of holes, a: radius of the tube portion 7, lc: length of the tube portion 7.

  Using the above equation, it is possible to selectively mute the frequency in question.

  As shown in FIG. 2, a box-shaped main body 1, a main body suction port 2 for sucking air from the outside into the upper surface of the main body 1, a fan 3 in the main body 1, and an upstream side and a downstream side of the fan 3. A partition plate 4 for partitioning the boundary, an orifice 6 having a bell mouth-like suction port 5 on the partition plate 4, and a plate-shaped sound insulating wall 10 directed from the main body 1 to the partition plate 4 on the upstream side of the fan 3; The sound insulation wall 10 and the partition plate 4 are configured to have a gap.

  Here, the main body 1 is a cube. However, if the main body 1 is configured as shown in FIG.

  When viewed from a plane perpendicular to the rotation axis 9 of the fan 3, the shape of the suction port 5 is circular, and the center of the suction port 5 is on the rotation shaft 9 of the fan 3.

  The gap 11 is provided on the upstream side of the fan 3, one communicating with the space from the downstream side of the main body suction port 2 to the upstream side of the suction port 5, and the other communicating with the sealed cavity 8. The sealed cavity portion 8 communicates with the outside through a gap 11 and is surrounded by a wall except for a portion communicating with the outside through the gap 11. Here, the gap 11 and the pipe part 7 show the same effect.

  In addition, the sound insulating wall 10 is configured in parallel with the rotational axis 9 of the fan 3 from the upper surface of the main body 1, but the sound insulating wall 10 may be configured obliquely with respect to the rotational axis 9 of the fan 3. You may comprise from the side.

  The sound insulating wall 10 is in contact with at least two side surfaces of the main body 1 and is formed of a straight plate, but it is not necessarily required to be a straight plate.

  Moreover, although the main body inlet 2 was provided in the upper surface of the main body 1, as long as it is an upstream side of the fan 3 in space other than the sealing cavity part 8, it may be provided anywhere.

  As a principle of resonance absorption, the air in the gap 11 works as an incompressible mass, and the air in the sealed cavity 8 works as one spring, and selectively absorbs the sound corresponding to the resonance frequency of this vibration system. can do. For this reason, the frequency which absorbs sound can be selected by changing the shape of the gap 11 or the sealed cavity 8.

As shown in FIG. 3, the air blower in Embodiment 1 of the present invention includes a box-shaped main body 1, a main body suction port 2 for sucking air from the outside into the upper surface of the main body 1, and a fan 3 in the main body 1. A partition plate 4 that partitions the boundary between the upstream side and the downstream side of the fan 3, and an orifice 6 having a bell mouth-like suction port 5 in the partition plate 4. The plate-like sound insulation wall 10 is provided from the orifice 6 to the orifice 6.

  Here, the main body 1 is a cube. However, if the main body 1 is configured as shown in FIG.

  When viewed from a plane perpendicular to the rotation axis 9 of the fan 3, the shape of the suction port 5 is circular, and the center of the suction port 5 is on the rotation shaft 9 of the fan 3.

  The gap 11 is provided on the upstream side of the fan 3, one communicating with the space from the downstream side of the main body suction port 2 to the upstream side of the suction port 5, and the other communicating with the sealed cavity 8. The sealed cavity portion 8 communicates with the outside through a gap 11 and is surrounded by a wall except for a portion communicating with the outside through the gap 11. Here, the gap 11 and the pipe part 7 show the same effect.

  Moreover, although the sound insulation wall 10 is in contact with the partition plate 4, it is not necessary to make the sound insulation wall 10 and the partition plate 4 contact each other.

  In addition, the sound insulating wall 10 is configured in parallel with the rotation shaft 9 of the fan 3 from the upper surface of the main body 1, but the sound insulating wall 10 may be configured to be inclined with respect to the rotation shaft 9 or configured from the side surface of the main body 1. May be.

  The sound insulating wall 10 is in contact with at least two side surfaces of the main body 1 and is formed of a straight plate, but it is not necessarily required to be a straight plate.

  Moreover, although the main body inlet 2 was provided in the upper surface of the main body 1, as long as it is an upstream side of the fan 3 in space other than the sealing cavity part 8, it may be provided anywhere.

  As a principle of resonance absorption, the air in the gap 11 works as an incompressible mass, and the air in the sealed cavity 8 works as one spring, and selectively absorbs the sound corresponding to the resonance frequency of this vibration system. can do. For this reason, the frequency which absorbs sound can be selected by changing the shape of the gap 11 or the sealed cavity 8.

  As shown in FIG. 4, when viewed from a plane perpendicular to the rotation axis 9 of the fan 3, the suction port 5 and the sound insulating wall 10 are provided so as to overlap each other. Moreover, it is not necessary for all of the sound insulating wall 10 to overlap the suction port 5, and it is sufficient that a part of the sound insulating wall 10 overlaps.

  The sound insulating wall 10 is in contact with the opposite side surfaces of the main body 1 and has a linear shape, but it is not necessarily required to have a linear shape.

  As shown in FIG. 5, a main body suction port 2 for sucking air from the outside is provided on the upper surface of the box-shaped main body 1, and the center and suction of the main body suction port 2 when viewed from a plane perpendicular to the rotation shaft 9 of the fan 3. The center of the mouth 5 is configured so as not to overlap.

  Here, the center is the center of the circle when the main body suction port 2 and the suction port 5 are circular when viewed from a plane perpendicular to the rotation axis 9 of the fan 3. If the main body suction port 2 and the suction port 5 are not circular, assuming that the main body suction port 2 and the suction port 5 have the same weight at all points, the main body suction port 2 and the suction port 5 are balanced. The center.

  Further, by providing the sound insulating plate 10 in the direction from the center of the main body suction port 2 toward the center of the suction port 2, a great silencing effect can be obtained.

  As shown in FIG. 6, the sealed cavity 8 is filled with a sound absorbing material 12 having air permeability.

  Here, when the sound-absorbing material 12 having air permeability is filled in the sealed cavity 8, an effective noise reduction effect can be obtained due to the effect of the sound-absorbing material 12. For example, the sound absorbing material 12 is glass wool.

  As described above, according to the present embodiment, by providing the sealed cavity 8 on the upstream side of the fan 3, turbulent flow noise and resonance noise generated in the main body 1 can be reduced.

  In addition, according to the present embodiment, the sealed cavity 8 is provided upstream of the fan 3 by the sound insulating wall 10 and the gap 11, and the sealed cavity 8 reduces turbulent noise and resonance noise generated in the main body 1. can do.

  In addition, a simple member such as the sound insulation wall 10 can reduce turbulent noise and resonance noise generated in the main body 1.

  In addition, according to the present embodiment, the sealed cavity 8 is provided upstream of the fan 3 by the sound insulating wall 10 and the gap 11, and the sealed cavity 8 reduces turbulent noise and resonance noise generated in the main body 1. can do.

  In addition, a simple member such as the sound insulation wall 10 can reduce turbulent noise and resonance noise generated in the main body 1.

  Further, when viewed from a plane perpendicular to the rotation axis 9 of the fan 3, since the suction port 5 and the sound insulation wall 10 overlap, sound waves radiated from the suction port 5 are easily radiated to the gap 11, and turbulent noise And resonance noise can be effectively reduced.

  In addition, according to the present embodiment, when viewed from a plane perpendicular to the rotation axis 9 of the fan 3, the center of the main body suction port 2 and the center of the suction port 5 are not overlapped with each other. The emitted sound wave can be made difficult to radiate directly to the outside.

  Further, by providing the sound insulation wall 10 from the center of the main body suction port 2 toward the center of the suction port 5, sound waves reduced by the effect of the sound insulation wall 10 from the turbulent noise and resonance noise are radiated from the main body suction port 2 to the outside. Can be difficult.

  In addition, according to the present embodiment, by filling the sealed cavity 8 with the sound absorbing material 12 having air permeability, turbulent noise and resonance noise generated in the main body 1 due to a synergistic effect with the sound absorbing material 12. Etc. can be effectively reduced.

(Embodiment 2)
FIG. 7 is a cross-sectional view illustrating the configuration of the blower in Reference Example 2 parallel to the rotation axis of the fan. FIG. 8 is a cross-sectional view parallel to the rotation axis of the fan, showing the configuration of the blower with the sound insulation wall attached. FIG. 9 is a cross-sectional view parallel to the rotation axis of the fan, showing the configuration of the blower device in which the sound insulation wall according to Embodiment 2 of the present invention is attached to the upstream side of the orifice. FIG. 10 is a cross-sectional view perpendicular to the rotation axis of the fan having the same configuration as FIG. FIG. 11 is a cross-sectional view perpendicular to the rotation axis of the fan. FIG. 12 is a cross-sectional view parallel to the rotation axis of the fan, showing the configuration of the blower device to which a sound absorbing material having air permeability is attached. FIG. 13 is a side view showing a configuration of a blower using an axial fan as a fan. FIG. 14 is a side view showing a configuration of a blower using a turbo fan as a fan. FIG. 15 is a cross-sectional view perpendicular to the rotation axis of the fan, showing the structure of the ventilation path downstream of the fan.

As shown in FIG. 7, the blower of Reference Example 2 includes a dividing plate 15 that is divided so that the upper surface 13 and the lower surface 14 of the main body 1 are separated, and a first suction port 16 that sucks air from the outside into the upper surface 13 of the main body 1. And the second suction port 17 for sucking the air sucked from the first suction port 16 into the dividing plate 15, the fan 3 in the space downstream of the second suction port 17, and the boundary between the upstream side and the downstream side of the fan 3 A partition plate 4 and an orifice 6 having a bell mouth-like suction port 5 in the partition plate 4, and a part of the sound generated from the fan 3 is incident on the pipe portion 7 on the upstream side of the orifice 6. In addition, the sealed cavity 8 that is resonantly absorbed is provided.

  Here, the main body 1 is a cube. However, if the main body 1 is configured as shown in FIG.

  When viewed from a plane perpendicular to the rotation axis 9 of the fan 3, the shape of the suction port 5 is circular, and the center of the suction port 5 is on the rotation shaft 9 of the fan 3.

  In FIG. 7, the shape of the tube portion 7 is a circular tube, but it is not necessarily a circular tube.

  The pipe portion 7 is provided on the upstream side of the fan 3, one communicating with the space from the downstream side of the second suction port 17 to the upstream side of the suction port 5, and the other communicating with the sealed cavity 8. The sealed cavity portion 8 communicates with the outside through the tube portion 7 and is surrounded by a wall except for a portion communicating with the outside through the tube portion 7.

  As a principle of resonance absorption, the air in the tube portion 7 acts as an incompressible mass, and the air in the sealed cavity portion 8 acts as one spring, and selectively selects a sound corresponding to the resonance frequency of this vibration system. Can absorb sound. For this reason, the frequency which absorbs a sound can be selected by changing the shape of the pipe part 7 or the sealed cavity part 8.

  Here, an expression for obtaining the resonance frequency to be silenced is shown.

    Here, fr: resonance frequency, C: speed of sound, n: number of holes, a: radius of the tube portion 7, lc: length of the tube portion 7.

  Using the above equation, it is possible to selectively mute the frequency in question.

  As shown in FIG. 8, the dividing plate 15 that is divided so that the upper surface 13 and the lower surface 14 of the main body 1 are separated, the first suction port 16 that sucks air from the outside into the upper surface 13 of the main body 1, and the first in the dividing plate 15. A second suction port 17 that sucks in air sucked from the suction port 16; a fan 3 in a space downstream of the second suction port 17; a partition plate 4 that partitions the boundary between the upstream side and the downstream side of the fan 3; The partition plate 4 is provided with an orifice 6 having a bell mouth-shaped suction port 5, and a plate-like sound insulation wall 10 directed from the dividing plate 15 toward the partition plate 4 is provided on the upstream side of the fan 3, and the sound insulation wall 10 and the partition plate 4 It is configured to have a gap between them.

  Here, the main body 1 is a cube. However, if the main body 1 is configured as shown in FIG.

  When viewed from a plane perpendicular to the rotation axis 9 of the fan 3, the shape of the suction port 5 is circular, and the center of the suction port 5 is on the rotation shaft 9 of the fan 3.

  The gap 11 is provided on the upstream side of the fan 3, one communicating with the space from the downstream side of the second suction port 17 to the upstream side of the suction port 5, and the other communicating with the sealed cavity 8. The sealed cavity portion 8 communicates with the outside through a gap 11 and is surrounded by a wall except for a portion communicating with the outside through the gap 11. Here, the gap 11 and the pipe part 7 show the same effect.

  The sound insulating wall 10 is configured in parallel with the rotation axis 9 of the fan 3 from the upper surface 13 of the main body 1, but the sound insulating wall 10 may be configured obliquely with respect to the rotation axis 9 of the fan 1 You may comprise from the side.

  The sound insulating wall 10 is in contact with at least two side surfaces of the main body 1 and is formed of a straight plate, but it is not necessarily required to be a straight plate.

  Further, although the first suction port 16 is provided on the upper surface 13 of the main body 1, it may be provided anywhere on the main body 1 as long as it is upstream of the second suction port 17.

  As a principle of resonance absorption, the air in the gap 11 works as an incompressible mass, and the air in the sealed cavity 8 works as one spring, and selectively absorbs the sound corresponding to the resonance frequency of this vibration system. can do. For this reason, the frequency which absorbs sound can be selected by changing the shape of the gap 11 or the sealed cavity 8.

As shown in FIG. 9, the air blower according to Embodiment 2 of the present invention includes a dividing plate 15 that is divided so that the upper surface 13 and the lower surface 14 of the main body 1 are separated, and a first air that sucks air from the outside into the upper surface 13 of the main body 1. A first suction port 16, a second suction port 17 for sucking air sucked from the first suction port 16 into the dividing plate 15, a fan 3 in a space downstream of the second suction port 17, and an upstream side of the fan 3, A partition plate 4 for partitioning the downstream boundary and an orifice 6 having a bell mouth-like suction port 5 are provided in the partition plate 4, and a plate-shaped sound insulating wall from the partition plate 15 to the orifice 6 on the upstream side of the orifice 6. 10 is provided.

  Here, the main body 1 is a cube. However, if the main body 1 is configured as shown in FIG.

  When viewed from a plane perpendicular to the rotation axis 9 of the fan 3, the shape of the suction port 5 is circular, and the center of the suction port 5 is on the rotation shaft 9 of the fan 3.

  The gap 11 is provided on the upstream side of the fan 3, one communicating with the space from the downstream side of the second suction port 17 to the upstream side of the suction port 5, and the other communicating with the sealed cavity 8. The sealed cavity portion 8 communicates with the outside through a gap 11 and is surrounded by a wall except for a portion communicating with the outside through the gap 11. Here, the gap 11 and the pipe part 7 show the same effect.

  Moreover, although the sound insulation wall 10 is in contact with the partition plate 4, it is not necessary to make the sound insulation wall 10 and the partition plate 4 contact each other.

  In addition, the sound insulating wall 10 is configured in parallel with the rotation shaft 9 of the fan 3 from the upper surface of the main body 1, but the sound insulating wall 10 may be configured to be inclined with respect to the rotation shaft 9 or configured from the side surface of the main body 1. May be.

  The sound insulating wall 10 is in contact with at least two side surfaces of the main body 1 and is formed of a straight plate, but it is not necessarily required to be a straight plate.

  Moreover, although the main body inlet 2 was provided in the upper surface of the main body 1, as long as it is an upstream side of the fan 3 in space other than the sealing cavity part 8, it may be provided anywhere.

  As a principle of resonance absorption, the air in the gap 11 works as an incompressible mass, and the air in the sealed cavity 8 works as one spring, and selectively absorbs the sound corresponding to the resonance frequency of this vibration system. can do. For this reason, the frequency which absorbs sound can be selected by changing the shape of the gap 11 or the sealed cavity 8.

  As shown in FIG. 10, when viewed from a plane perpendicular to the rotation axis 9 of the fan 3, the suction port 5 and the sound insulating wall 10 are provided so as to overlap each other. Moreover, it is not necessary for all of the sound insulating wall 10 to overlap the suction port 5, and it is sufficient that a part of the sound insulating wall 10 overlaps.

  The sound insulating wall 10 is in contact with the opposite side surfaces of the main body 1 and has a linear shape, but it is not necessarily required to have a linear shape.

  As shown in FIG. 11, the second suction port 17 is provided in the dividing plate 15 that is divided so that the upper surface 13 and the lower surface 14 of the main body 1 are separated, and when viewed from a plane perpendicular to the rotating shaft 9 of the fan 3, The center of the port 17 and the center of the suction port 5 are provided so as not to overlap.

  Here, the center is the center of a circle when the second suction port 17 and the suction port 5 are circular when viewed from a plane perpendicular to the rotation axis 9 of the fan 3. If the second suction port 17 and the suction port 5 are not circular, the second suction port 17 and the suction port 5 are assumed to have the same weight in all points of the second suction port 17 and the suction port 5. Focus on balanced points.

  In addition, by providing the sound insulating plate 10 in the direction from the center of the second suction port 17 toward the center of the suction port 5, a great silencing effect can be obtained. The farther away the second suction port is from the sound insulation wall 10, the greater the noise reduction effect can be obtained.

  As shown in FIG. 12, the sealed cavity 8 is filled with a sound absorbing material 12 having air permeability.

  Here, when the sound-absorbing material 12 having air permeability is filled in the sealed cavity 8, an effective noise reduction effect can be obtained due to the effect of the sound-absorbing material 12. For example, the sound absorbing material 12 is glass wool.

  As shown in FIG. 13, the fan is an axial fan 18.

  Here, the axial fan 18 refers to a fan that generates an air flow parallel to the rotation axis.

  There is also a mixed flow fan that discharges obliquely with respect to the fan rotation axis.

  As shown in FIG. 14, the fan is a turbo fan 19.

  Here, the turbo fan refers to a fan in which the direction of the blade at the fan outlet is inclined in the opposite direction of rotation in the centrifugal blower.

  As shown in FIG. 15, the side surface 20 of the box-shaped main body 1 is provided with a discharge port 21 for discharging to the outside, and when viewed from a plane parallel to the rotation axis 9 of the fan 3, the rotation center of the fan 3 from the discharge port 21. It is the structure provided with the sound insulation wall 10 in the direction which goes to.

  Here, when viewed from a plane perpendicular to the rotation shaft 9 of the fan 3, the suction air volume is small in a range away from the discharge port 21 inside the suction port 5. For this reason, if a sound insulation wall is provided in this range, a sufficient silencing effect can be obtained without deteriorating the air flow characteristics.

  In FIG. 15, the fan is an axial fan, but it may be a turbo fan or a sirocco fan.

  As described above, according to the present embodiment, by providing the sealed cavity 8 on the upstream side of the fan 3, turbulent flow noise and resonance noise generated in the main body 1 can be reduced.

  In addition, according to the present embodiment, the sealed cavity 8 is provided upstream of the fan 3 by the sound insulating wall 10 and the gap 11, and the sealed cavity 8 reduces turbulent noise and resonance noise generated in the main body 1. can do.

  In addition, a simple member such as the sound insulation wall 10 can reduce turbulent noise and resonance noise generated in the main body 1.

  In addition, according to the present embodiment, the sealed cavity 8 is provided upstream of the fan 3 by the sound insulating wall 10 and the gap 11, and the sealed cavity 8 reduces turbulent noise and resonance noise generated in the main body 1. can do.

  In addition, a simple member such as the sound insulation wall 10 can reduce turbulent noise and resonance noise generated in the main body 1.

  Further, when viewed from a plane perpendicular to the rotation axis 9 of the fan 3, since the suction port 5 and the sound insulation wall 10 overlap, sound waves radiated from the suction port 5 are easily radiated to the gap 11, and turbulent noise And resonance noise can be effectively reduced.

  In addition, according to the present embodiment, when viewed from a plane perpendicular to the rotation axis 9 of the fan 3, the center of the second suction port 17 and the center of the suction port 5 are not overlapped, whereby the suction port 5. It is possible to make it difficult to emit sound waves emitted from the outside directly.

  In addition, by providing the sound insulating wall 10 from the center of the second suction port 17 toward the center of the suction port 5, sound waves in which turbulent noise and resonance noise are reduced by the effect of the sound insulating wall 10 are externally transmitted from the second suction port 17. Can be made difficult to radiate.

  In addition, according to the present embodiment, by filling the sealed cavity 8 with the sound absorbing material 12 having air permeability, turbulent noise and resonance noise generated in the main body 1 due to a synergistic effect with the sound absorbing material 12. Etc. can be effectively reduced.

  Further, according to the present embodiment, the fan is the axial flow fan 18. The sound insulation wall 10 and the gap 11 provide the sealed cavity 8 upstream of the fan 3, and the sealed cavity 8 can reduce turbulent noise and resonance noise generated in the main body 1.

  In addition, a simple member such as the sound insulation wall 10 can reduce turbulent noise and resonance noise generated in the main body 1.

  Further, according to the present embodiment, the turbo fan 19 is used as the fan. The sound insulation wall 10 and the gap 11 provide the sealed cavity 8 upstream of the fan 3, and the sealed cavity 8 can reduce turbulent noise and resonance noise generated in the main body 1.

  In addition, a simple member such as the sound insulation wall 10 can reduce turbulent noise and resonance noise generated in the main body 1.

  Further, according to the present embodiment, the sound insulating wall 10 is provided in the direction from the discharge port 21 toward the rotation center of the fan 3 when viewed from a plane parallel to the rotation axis 9 of the fan 3. The range provided with the sound insulation wall 10 inside the suction port 5 has a small amount of intake air. Therefore, if the sound insulation wall is provided within this range, a sufficient silencing effect can be obtained without deteriorating the air flow characteristics.

  Since the air blower according to the present invention has a simple structure and can obtain a silencing effect, it is useful when applied to a ventilator, an air blower, an air conditioner or the like with reduced manufacturing costs.

Sectional drawing parallel to the rotating shaft of the fan which shows the structure of the air blower in the reference example 1 . Sectional view parallel to the rotation axis of the fan with the sound insulation wall in the blower Sectional drawing parallel to the rotating shaft of the fan which attached the sound insulation wall in the air blower of Embodiment 1 of this invention to the upstream of the orifice Sectional drawing perpendicular | vertical to the fan rotating shaft of FIG. 3 in the same air blower Top view as seen from a plane perpendicular to the rotation axis of the fan in the blower Sectional drawing parallel to the rotating shaft of the fan which attached the sound-absorbing material with air permeability in the air blower Sectional drawing parallel to the rotating shaft of the fan which shows the structure of the air blower in the reference example 2 . Sectional view parallel to the rotation axis of the fan with the sound insulation wall in the blower Sectional drawing perpendicular | vertical to the rotating shaft of the fan which attached the sound insulation wall in the air blower of Embodiment 2 of this invention to the upstream of the orifice Sectional drawing perpendicular | vertical to the fan rotating shaft of FIG. 9 in the same air blower Sectional view perpendicular to the rotation axis of the fan in the blower Sectional drawing parallel to the rotating shaft of the fan which attached the sound-absorbing material with air permeability in the air blower Side view of the fan in the air blower as an axial fan Side view of the fan in the air blower as a turbo fan Sectional drawing perpendicular | vertical to the rotating shaft of a fan which shows the structure of the ventilation path downstream of the fan in the same air blower Cross-sectional view showing a conventional blower

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Main body suction port 3 Fan 4 Partition plate 5 Suction port 6 Orifice 7 Pipe part 8 Sealing cavity part 9 Rotating shaft 10 Sound insulation wall 11 Crevice 12 Sound absorbing material 13 Upper surface 14 Lower surface 15 Dividing plate 16 1st suction port 17 2nd suction port 18 Axial fan 19 Turbo fan

Claims (8)

A box-shaped main body, a main body suction port for sucking air from the outside into the main body, a fan in the main body, a partition plate that partitions the boundary between the upstream side and the downstream side of the fan, and a bell mouth shape on the partition plate And an orifice having a suction port, and on the upstream side of the orifice, a plate-shaped sound insulating wall from the main body to the orifice , a sealed cavity surrounded by the main body, the partition plate, and the sound insulating wall, and a gap The gap is provided on the upstream side of the fan, and one of the gaps communicates with a space from the downstream side of the main body suction port to the upstream side of the suction port, and the other of the gaps communicates with the sealed cavity. sealing the cavity except the gap is surrounded by the said partition plate and said body sound insulating wall, when viewed from a plane perpendicular to the axis of rotation of the fan, comprising as the said inlet sound insulation wall overlaps this Blower apparatus according to claim. The blower according to claim 1 , wherein the blower device is provided so that the center of the main body suction port and the center of the suction port do not overlap each other when viewed from a plane perpendicular to the rotation axis of the fan. Viewed from a plane perpendicular to the axis of rotation of the fan, claim 1, characterized in that with a sound insulating plate in the extending direction beyond the center of the suction port in a direction toward the center of the inlet from the center of the main body suction port Or the ventilation apparatus of 2 . The air blower according to any one of claims 1 to 3, wherein a sound absorbing material having air permeability is filled in the sealed cavity. A box-shaped main body, a dividing plate that is divided so that an upper surface and a lower surface of the main body are separated, a first suction port that sucks air from outside into the main body, and air that is sucked into the dividing plate from the first suction port A second suction port for sucking air, a fan in the space downstream of the second suction port, a partition plate for partitioning the boundary between the upstream side and the downstream side of the fan, and an orifice having a bell mouth-like suction port in the partition plate On the upstream side of the orifice, a plate-shaped sound insulating wall facing the orifice from the divided plate, a sealed cavity surrounded by the main body, the divided plate, the partition plate, and the sound insulating wall, and a gap are provided. The gap is provided on the upstream side of the fan, and one of the gaps communicates with a space from the second suction port downstream side to the suction port upstream side, and the other of the gaps communicates with the sealed cavity. Sealed cavity The other gap is surrounded by the said partition plate and said dividing plate and the body sound insulating wall, when viewed from a plane perpendicular to the axis of rotation of the fan, characterized in that the said orifice sound insulating wall is provided so as to overlap Blower device. The blower according to claim 5 , wherein the blower device is provided so that the center of the second suction port and the center of the suction port do not overlap each other when viewed from a plane perpendicular to the rotation axis of the fan. The sound insulation wall is provided in an extending direction beyond the center of the suction port in a direction from the center of the second suction port toward the center of the suction port when viewed from a plane perpendicular to the rotation axis of the fan. The blower according to 5 or 6 . The air blower according to any one of claims 5 to 7, wherein the sealed cavity is filled with a sound absorbing material having air permeability.

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